// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity 0.8.17;
import "lib/openzeppelin-contracts/contracts/proxy/Proxy.sol";
import "lib/openzeppelin-contracts/contracts/proxy/ERC1967/ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    struct StringSlot {
        string value;
    }
    struct BytesSlot {
        bytes value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity 0.8.17;
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// Archetype v0.2.0


// ERC721A Contracts v4.2.2
// Creator: Chiru Labs




// ERC721A Contracts v4.2.2
// Creator: Chiru Labs



/**
 * @dev Interface of ERC721A.
 */
interface IERC721A {
    /**
     * The caller must own the token or be an approved operator.
     */
    error ApprovalCallerNotOwnerNorApproved();

    /**
     * The token does not exist.
     */
    error ApprovalQueryForNonexistentToken();

    /**
     * The caller cannot approve to their own address.
     */
    error ApproveToCaller();

    /**
     * Cannot query the balance for the zero address.
     */
    error BalanceQueryForZeroAddress();

    /**
     * Cannot mint to the zero address.
     */
    error MintToZeroAddress();

    /**
     * The quantity of tokens minted must be more than zero.
     */
    error MintZeroQuantity();

    /**
     * The token does not exist.
     */
    error OwnerQueryForNonexistentToken();

    /**
     * The caller must own the token or be an approved operator.
     */
    error TransferCallerNotOwnerNorApproved();

    /**
     * The token must be owned by `from`.
     */
    error TransferFromIncorrectOwner();

    /**
     * Cannot safely transfer to a contract that does not implement the
     * ERC721Receiver interface.
     */
    error TransferToNonERC721ReceiverImplementer();

    /**
     * Cannot transfer to the zero address.
     */
    error TransferToZeroAddress();

    /**
     * The token does not exist.
     */
    error URIQueryForNonexistentToken();

    /**
     * The `quantity` minted with ERC2309 exceeds the safety limit.
     */
    error MintERC2309QuantityExceedsLimit();

    /**
     * The `extraData` cannot be set on an unintialized ownership slot.
     */
    error OwnershipNotInitializedForExtraData();

    // =============================================================
    //                            STRUCTS
    // =============================================================

    struct TokenOwnership {
        // The address of the owner.
        address addr;
        // Stores the start time of ownership with minimal overhead for tokenomics.
        uint64 startTimestamp;
        // Whether the token has been burned.
        bool burned;
        // Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
        uint24 extraData;
    }

    // =============================================================
    //                         TOKEN COUNTERS
    // =============================================================

    /**
     * @dev Returns the total number of tokens in existence.
     * Burned tokens will reduce the count.
     * To get the total number of tokens minted, please see {_totalMinted}.
     */
    function totalSupply() external view returns (uint256);

    // =============================================================
    //                            IERC165
    // =============================================================

    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);

    // =============================================================
    //                            IERC721
    // =============================================================

    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables
     * (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in `owner`'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`,
     * checking first that contract recipients are aware of the ERC721 protocol
     * to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move
     * this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement
     * {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom}
     * whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token
     * by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the
     * zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom}
     * for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    // =============================================================
    //                        IERC721Metadata
    // =============================================================

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);

    // =============================================================
    //                           IERC2309
    // =============================================================

    /**
     * @dev Emitted when tokens in `fromTokenId` to `toTokenId`
     * (inclusive) is transferred from `from` to `to`, as defined in the
     * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
     *
     * See {_mintERC2309} for more details.
     */
    event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}


/**
 * @dev Interface of ERC721 token receiver.
 */
interface ERC721A__IERC721Receiver {
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

/**
 * @title ERC721A
 *
 * @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721)
 * Non-Fungible Token Standard, including the Metadata extension.
 * Optimized for lower gas during batch mints.
 *
 * Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...)
 * starting from `_startTokenId()`.
 *
 * Assumptions:
 *
 * - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 * - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256).
 */
contract ERC721A is IERC721A {
    // Reference type for token approval.
    struct TokenApprovalRef {
        address value;
    }

    // =============================================================
    //                           CONSTANTS
    // =============================================================

    // Mask of an entry in packed address data.
    uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;

    // The bit position of `numberMinted` in packed address data.
    uint256 private constant _BITPOS_NUMBER_MINTED = 64;

    // The bit position of `numberBurned` in packed address data.
    uint256 private constant _BITPOS_NUMBER_BURNED = 128;

    // The bit position of `aux` in packed address data.
    uint256 private constant _BITPOS_AUX = 192;

    // Mask of all 256 bits in packed address data except the 64 bits for `aux`.
    uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;

    // The bit position of `startTimestamp` in packed ownership.
    uint256 private constant _BITPOS_START_TIMESTAMP = 160;

    // The bit mask of the `burned` bit in packed ownership.
    uint256 private constant _BITMASK_BURNED = 1 << 224;

    // The bit position of the `nextInitialized` bit in packed ownership.
    uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;

    // The bit mask of the `nextInitialized` bit in packed ownership.
    uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;

    // The bit position of `extraData` in packed ownership.
    uint256 private constant _BITPOS_EXTRA_DATA = 232;

    // Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`.
    uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;

    // The mask of the lower 160 bits for addresses.
    uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;

    // The maximum `quantity` that can be minted with {_mintERC2309}.
    // This limit is to prevent overflows on the address data entries.
    // For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309}
    // is required to cause an overflow, which is unrealistic.
    uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;

    // The `Transfer` event signature is given by:
    // `keccak256(bytes("Transfer(address,address,uint256)"))`.
    bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
        0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

    // =============================================================
    //                            STORAGE
    // =============================================================

    // The next token ID to be minted.
    uint256 private _currentIndex;

    // The number of tokens burned.
    uint256 private _burnCounter;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to ownership details
    // An empty struct value does not necessarily mean the token is unowned.
    // See {_packedOwnershipOf} implementation for details.
    //
    // Bits Layout:
    // - [0..159]   `addr`
    // - [160..223] `startTimestamp`
    // - [224]      `burned`
    // - [225]      `nextInitialized`
    // - [232..255] `extraData`
    mapping(uint256 => uint256) private _packedOwnerships;

    // Mapping owner address to address data.
    //
    // Bits Layout:
    // - [0..63]    `balance`
    // - [64..127]  `numberMinted`
    // - [128..191] `numberBurned`
    // - [192..255] `aux`
    mapping(address => uint256) private _packedAddressData;

    // Mapping from token ID to approved address.
    mapping(uint256 => TokenApprovalRef) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // =============================================================
    //                          CONSTRUCTOR
    // =============================================================

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
        _currentIndex = _startTokenId();
    }

    // =============================================================
    //                   TOKEN COUNTING OPERATIONS
    // =============================================================

    /**
     * @dev Returns the starting token ID.
     * To change the starting token ID, please override this function.
     */
    function _startTokenId() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev Returns the next token ID to be minted.
     */
    function _nextTokenId() internal view virtual returns (uint256) {
        return _currentIndex;
    }

    /**
     * @dev Returns the total number of tokens in existence.
     * Burned tokens will reduce the count.
     * To get the total number of tokens minted, please see {_totalMinted}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // Counter underflow is impossible as _burnCounter cannot be incremented
        // more than `_currentIndex - _startTokenId()` times.
        unchecked {
            return _currentIndex - _burnCounter - _startTokenId();
        }
    }

    /**
     * @dev Returns the total amount of tokens minted in the contract.
     */
    function _totalMinted() internal view virtual returns (uint256) {
        // Counter underflow is impossible as `_currentIndex` does not decrement,
        // and it is initialized to `_startTokenId()`.
        unchecked {
            return _currentIndex - _startTokenId();
        }
    }

    /**
     * @dev Returns the total number of tokens burned.
     */
    function _totalBurned() internal view virtual returns (uint256) {
        return _burnCounter;
    }

    // =============================================================
    //                    ADDRESS DATA OPERATIONS
    // =============================================================

    /**
     * @dev Returns the number of tokens in `owner`'s account.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();
        return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    /**
     * Returns the number of tokens minted by `owner`.
     */
    function _numberMinted(address owner) internal view returns (uint256) {
        return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    /**
     * Returns the number of tokens burned by or on behalf of `owner`.
     */
    function _numberBurned(address owner) internal view returns (uint256) {
        return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    /**
     * Returns the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
     */
    function _getAux(address owner) internal view returns (uint64) {
        return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
    }

    /**
     * Sets the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
     * If there are multiple variables, please pack them into a uint64.
     */
    function _setAux(address owner, uint64 aux) internal virtual {
        uint256 packed = _packedAddressData[owner];
        uint256 auxCasted;
        // Cast `aux` with assembly to avoid redundant masking.
        assembly {
            auxCasted := aux
        }
        packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);
        _packedAddressData[owner] = packed;
    }

    // =============================================================
    //                            IERC165
    // =============================================================

    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        // The interface IDs are constants representing the first 4 bytes
        // of the XOR of all function selectors in the interface.
        // See: [ERC165](https://eips.ethereum.org/EIPS/eip-165)
        // (e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`)
        return
            interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165.
            interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721.
            interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata.
    }

    // =============================================================
    //                        IERC721Metadata
    // =============================================================

    /**
     * @dev Returns the token collection name.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        string memory baseURI = _baseURI();
        return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, _toString(tokenId))) : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, it can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return '';
    }

    // =============================================================
    //                     OWNERSHIPS OPERATIONS
    // =============================================================

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return address(uint160(_packedOwnershipOf(tokenId)));
    }

    /**
     * @dev Gas spent here starts off proportional to the maximum mint batch size.
     * It gradually moves to O(1) as tokens get transferred around over time.
     */
    function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {
        return _unpackedOwnership(_packedOwnershipOf(tokenId));
    }

    /**
     * @dev Returns the unpacked `TokenOwnership` struct at `index`.
     */
    function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {
        return _unpackedOwnership(_packedOwnerships[index]);
    }

    /**
     * @dev Initializes the ownership slot minted at `index` for efficiency purposes.
     */
    function _initializeOwnershipAt(uint256 index) internal virtual {
        if (_packedOwnerships[index] == 0) {
            _packedOwnerships[index] = _packedOwnershipOf(index);
        }
    }

    /**
     * Returns the packed ownership data of `tokenId`.
     */
    function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) {
        uint256 curr = tokenId;

        unchecked {
            if (_startTokenId() <= curr)
                if (curr < _currentIndex) {
                    uint256 packed = _packedOwnerships[curr];
                    // If not burned.
                    if (packed & _BITMASK_BURNED == 0) {
                        // Invariant:
                        // There will always be an initialized ownership slot
                        // (i.e. `ownership.addr != address(0) && ownership.burned == false`)
                        // before an unintialized ownership slot
                        // (i.e. `ownership.addr == address(0) && ownership.burned == false`)
                        // Hence, `curr` will not underflow.
                        //
                        // We can directly compare the packed value.
                        // If the address is zero, packed will be zero.
                        while (packed == 0) {
                            packed = _packedOwnerships[--curr];
                        }
                        return packed;
                    }
                }
        }
        revert OwnerQueryForNonexistentToken();
    }

    /**
     * @dev Returns the unpacked `TokenOwnership` struct from `packed`.
     */
    function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {
        ownership.addr = address(uint160(packed));
        ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);
        ownership.burned = packed & _BITMASK_BURNED != 0;
        ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
    }

    /**
     * @dev Packs ownership data into a single uint256.
     */
    function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) {
        assembly {
            // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
            owner := and(owner, _BITMASK_ADDRESS)
            // `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.
            result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))
        }
    }

    /**
     * @dev Returns the `nextInitialized` flag set if `quantity` equals 1.
     */
    function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {
        // For branchless setting of the `nextInitialized` flag.
        assembly {
            // `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.
            result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
        }
    }

    // =============================================================
    //                      APPROVAL OPERATIONS
    // =============================================================

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the
     * zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);

        if (_msgSenderERC721A() != owner)
            if (!isApprovedForAll(owner, _msgSenderERC721A())) {
                revert ApprovalCallerNotOwnerNorApproved();
            }

        _tokenApprovals[tokenId].value = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

        return _tokenApprovals[tokenId].value;
    }

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom}
     * for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        if (operator == _msgSenderERC721A()) revert ApproveToCaller();

        _operatorApprovals[_msgSenderERC721A()][operator] = approved;
        emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
    }

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted. See {_mint}.
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return
            _startTokenId() <= tokenId &&
            tokenId < _currentIndex && // If within bounds,
            _packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned.
    }

    /**
     * @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`.
     */
    function _isSenderApprovedOrOwner(
        address approvedAddress,
        address owner,
        address msgSender
    ) private pure returns (bool result) {
        assembly {
            // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
            owner := and(owner, _BITMASK_ADDRESS)
            // Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean.
            msgSender := and(msgSender, _BITMASK_ADDRESS)
            // `msgSender == owner || msgSender == approvedAddress`.
            result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
        }
    }

    /**
     * @dev Returns the storage slot and value for the approved address of `tokenId`.
     */
    function _getApprovedSlotAndAddress(uint256 tokenId)
        private
        view
        returns (uint256 approvedAddressSlot, address approvedAddress)
    {
        TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
        // The following is equivalent to `approvedAddress = _tokenApprovals[tokenId].value`.
        assembly {
            approvedAddressSlot := tokenApproval.slot
            approvedAddress := sload(approvedAddressSlot)
        }
    }

    // =============================================================
    //                      TRANSFER OPERATIONS
    // =============================================================

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token
     * by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);

        if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();

        (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);

        // The nested ifs save around 20+ gas over a compound boolean condition.
        if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
            if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();

        if (to == address(0)) revert TransferToZeroAddress();

        _beforeTokenTransfers(from, to, tokenId, 1);

        // Clear approvals from the previous owner.
        assembly {
            if approvedAddress {
                // This is equivalent to `delete _tokenApprovals[tokenId]`.
                sstore(approvedAddressSlot, 0)
            }
        }

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
        unchecked {
            // We can directly increment and decrement the balances.
            --_packedAddressData[from]; // Updates: `balance -= 1`.
            ++_packedAddressData[to]; // Updates: `balance += 1`.

            // Updates:
            // - `address` to the next owner.
            // - `startTimestamp` to the timestamp of transfering.
            // - `burned` to `false`.
            // - `nextInitialized` to `true`.
            _packedOwnerships[tokenId] = _packOwnershipData(
                to,
                _BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)
            );

            // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
            if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
                uint256 nextTokenId = tokenId + 1;
                // If the next slot's address is zero and not burned (i.e. packed value is zero).
                if (_packedOwnerships[nextTokenId] == 0) {
                    // If the next slot is within bounds.
                    if (nextTokenId != _currentIndex) {
                        // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;
                    }
                }
            }
        }

        emit Transfer(from, to, tokenId);
        _afterTokenTransfers(from, to, tokenId, 1);
    }

    /**
     * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, '');
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token
     * by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement
     * {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        transferFrom(from, to, tokenId);
        if (to.code.length != 0)
            if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
                revert TransferToNonERC721ReceiverImplementer();
            }
    }

    /**
     * @dev Hook that is called before a set of serially-ordered token IDs
     * are about to be transferred. This includes minting.
     * And also called before burning one token.
     *
     * `startTokenId` - the first token ID to be transferred.
     * `quantity` - the amount to be transferred.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, `tokenId` will be burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    /**
     * @dev Hook that is called after a set of serially-ordered token IDs
     * have been transferred. This includes minting.
     * And also called after one token has been burned.
     *
     * `startTokenId` - the first token ID to be transferred.
     * `quantity` - the amount to be transferred.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
     * transferred to `to`.
     * - When `from` is zero, `tokenId` has been minted for `to`.
     * - When `to` is zero, `tokenId` has been burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    /**
     * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target contract.
     *
     * `from` - Previous owner of the given token ID.
     * `to` - Target address that will receive the token.
     * `tokenId` - Token ID to be transferred.
     * `_data` - Optional data to send along with the call.
     *
     * Returns whether the call correctly returned the expected magic value.
     */
    function _checkContractOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (
            bytes4 retval
        ) {
            return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;
        } catch (bytes memory reason) {
            if (reason.length == 0) {
                revert TransferToNonERC721ReceiverImplementer();
            } else {
                assembly {
                    revert(add(32, reason), mload(reason))
                }
            }
        }
    }

    // =============================================================
    //                        MINT OPERATIONS
    // =============================================================

    /**
     * @dev Mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event for each mint.
     */
    function _mint(address to, uint256 quantity) internal virtual {
        uint256 startTokenId = _currentIndex;
        if (quantity == 0) revert MintZeroQuantity();

        _beforeTokenTransfers(address(0), to, startTokenId, quantity);

        // Overflows are incredibly unrealistic.
        // `balance` and `numberMinted` have a maximum limit of 2**64.
        // `tokenId` has a maximum limit of 2**256.
        unchecked {
            // Updates:
            // - `balance += quantity`.
            // - `numberMinted += quantity`.
            //
            // We can directly add to the `balance` and `numberMinted`.
            _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);

            // Updates:
            // - `address` to the owner.
            // - `startTimestamp` to the timestamp of minting.
            // - `burned` to `false`.
            // - `nextInitialized` to `quantity == 1`.
            _packedOwnerships[startTokenId] = _packOwnershipData(
                to,
                _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
            );

            uint256 toMasked;
            uint256 end = startTokenId + quantity;

            // Use assembly to loop and emit the `Transfer` event for gas savings.
            // The duplicated `log4` removes an extra check and reduces stack juggling.
            // The assembly, together with the surrounding Solidity code, have been
            // delicately arranged to nudge the compiler into producing optimized opcodes.
            assembly {
                // Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
                toMasked := and(to, _BITMASK_ADDRESS)
                // Emit the `Transfer` event.
                log4(
                    0, // Start of data (0, since no data).
                    0, // End of data (0, since no data).
                    _TRANSFER_EVENT_SIGNATURE, // Signature.
                    0, // `address(0)`.
                    toMasked, // `to`.
                    startTokenId // `tokenId`.
                )

                for {
                    let tokenId := add(startTokenId, 1)
                } iszero(eq(tokenId, end)) {
                    tokenId := add(tokenId, 1)
                } {
                    // Emit the `Transfer` event. Similar to above.
                    log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
                }
            }
            if (toMasked == 0) revert MintToZeroAddress();

            _currentIndex = end;
        }
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }

    /**
     * @dev Mints `quantity` tokens and transfers them to `to`.
     *
     * This function is intended for efficient minting only during contract creation.
     *
     * It emits only one {ConsecutiveTransfer} as defined in
     * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309),
     * instead of a sequence of {Transfer} event(s).
     *
     * Calling this function outside of contract creation WILL make your contract
     * non-compliant with the ERC721 standard.
     * For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309
     * {ConsecutiveTransfer} event is only permissible during contract creation.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `quantity` must be greater than 0.
     *
     * Emits a {ConsecutiveTransfer} event.
     */
    function _mintERC2309(address to, uint256 quantity) internal virtual {
        uint256 startTokenId = _currentIndex;
        if (to == address(0)) revert MintToZeroAddress();
        if (quantity == 0) revert MintZeroQuantity();
        if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit();

        _beforeTokenTransfers(address(0), to, startTokenId, quantity);

        // Overflows are unrealistic due to the above check for `quantity` to be below the limit.
        unchecked {
            // Updates:
            // - `balance += quantity`.
            // - `numberMinted += quantity`.
            //
            // We can directly add to the `balance` and `numberMinted`.
            _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);

            // Updates:
            // - `address` to the owner.
            // - `startTimestamp` to the timestamp of minting.
            // - `burned` to `false`.
            // - `nextInitialized` to `quantity == 1`.
            _packedOwnerships[startTokenId] = _packOwnershipData(
                to,
                _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
            );

            emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);

            _currentIndex = startTokenId + quantity;
        }
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }

    /**
     * @dev Safely mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement
     * {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
     * - `quantity` must be greater than 0.
     *
     * See {_mint}.
     *
     * Emits a {Transfer} event for each mint.
     */
    function _safeMint(
        address to,
        uint256 quantity,
        bytes memory _data
    ) internal virtual {
        _mint(to, quantity);

        unchecked {
            if (to.code.length != 0) {
                uint256 end = _currentIndex;
                uint256 index = end - quantity;
                do {
                    if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {
                        revert TransferToNonERC721ReceiverImplementer();
                    }
                } while (index < end);
                // Reentrancy protection.
                if (_currentIndex != end) revert();
            }
        }
    }

    /**
     * @dev Equivalent to `_safeMint(to, quantity, '')`.
     */
    function _safeMint(address to, uint256 quantity) internal virtual {
        _safeMint(to, quantity, '');
    }

    // =============================================================
    //                        BURN OPERATIONS
    // =============================================================

    /**
     * @dev Equivalent to `_burn(tokenId, false)`.
     */
    function _burn(uint256 tokenId) internal virtual {
        _burn(tokenId, false);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);

        address from = address(uint160(prevOwnershipPacked));

        (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);

        if (approvalCheck) {
            // The nested ifs save around 20+ gas over a compound boolean condition.
            if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
                if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();
        }

        _beforeTokenTransfers(from, address(0), tokenId, 1);

        // Clear approvals from the previous owner.
        assembly {
            if approvedAddress {
                // This is equivalent to `delete _tokenApprovals[tokenId]`.
                sstore(approvedAddressSlot, 0)
            }
        }

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
        unchecked {
            // Updates:
            // - `balance -= 1`.
            // - `numberBurned += 1`.
            //
            // We can directly decrement the balance, and increment the number burned.
            // This is equivalent to `packed -= 1; packed += 1 << _BITPOS_NUMBER_BURNED;`.
            _packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;

            // Updates:
            // - `address` to the last owner.
            // - `startTimestamp` to the timestamp of burning.
            // - `burned` to `true`.
            // - `nextInitialized` to `true`.
            _packedOwnerships[tokenId] = _packOwnershipData(
                from,
                (_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked)
            );

            // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
            if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
                uint256 nextTokenId = tokenId + 1;
                // If the next slot's address is zero and not burned (i.e. packed value is zero).
                if (_packedOwnerships[nextTokenId] == 0) {
                    // If the next slot is within bounds.
                    if (nextTokenId != _currentIndex) {
                        // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;
                    }
                }
            }
        }

        emit Transfer(from, address(0), tokenId);
        _afterTokenTransfers(from, address(0), tokenId, 1);

        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
        unchecked {
            _burnCounter++;
        }
    }

    // =============================================================
    //                     EXTRA DATA OPERATIONS
    // =============================================================

    /**
     * @dev Directly sets the extra data for the ownership data `index`.
     */
    function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
        uint256 packed = _packedOwnerships[index];
        if (packed == 0) revert OwnershipNotInitializedForExtraData();
        uint256 extraDataCasted;
        // Cast `extraData` with assembly to avoid redundant masking.
        assembly {
            extraDataCasted := extraData
        }
        packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA);
        _packedOwnerships[index] = packed;
    }

    /**
     * @dev Called during each token transfer to set the 24bit `extraData` field.
     * Intended to be overridden by the cosumer contract.
     *
     * `previousExtraData` - the value of `extraData` before transfer.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, `tokenId` will be burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _extraData(
        address from,
        address to,
        uint24 previousExtraData
    ) internal view virtual returns (uint24) {}

    /**
     * @dev Returns the next extra data for the packed ownership data.
     * The returned result is shifted into position.
     */
    function _nextExtraData(
        address from,
        address to,
        uint256 prevOwnershipPacked
    ) private view returns (uint256) {
        uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
        return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
    }

    // =============================================================
    //                       OTHER OPERATIONS
    // =============================================================

    /**
     * @dev Returns the message sender (defaults to `msg.sender`).
     *
     * If you are writing GSN compatible contracts, you need to override this function.
     */
    function _msgSenderERC721A() internal view virtual returns (address) {
        return msg.sender;
    }

    /**
     * @dev Converts a uint256 to its ASCII string decimal representation.
     */
    function _toString(uint256 value) internal pure virtual returns (string memory str) {
        assembly {
            // The maximum value of a uint256 contains 78 digits (1 byte per digit),
            // but we allocate 0x80 bytes to keep the free memory pointer 32-byte word aligned.
            // We will need 1 32-byte word to store the length,
            // and 3 32-byte words to store a maximum of 78 digits. Total: 0x20 + 3 * 0x20 = 0x80.
            str := add(mload(0x40), 0x80)
            // Update the free memory pointer to allocate.
            mstore(0x40, str)

            // Cache the end of the memory to calculate the length later.
            let end := str

            // We write the string from rightmost digit to leftmost digit.
            // The following is essentially a do-while loop that also handles the zero case.
            // prettier-ignore
            for { let temp := value } 1 {} {
                str := sub(str, 1)
                // Write the character to the pointer.
                // The ASCII index of the '0' character is 48.
                mstore8(str, add(48, mod(temp, 10)))
                // Keep dividing `temp` until zero.
                temp := div(temp, 10)
                // prettier-ignore
                if iszero(temp) { break }
            }

            let length := sub(end, str)
            // Move the pointer 32 bytes leftwards to make room for the length.
            str := sub(str, 0x20)
            // Store the length.
            mstore(str, length)
        }
    }
}


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)




// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)



/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}



// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)





/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

//import "hardhat/console.sol";

error InvalidConfig();
error MintNotYetStarted();
error WalletUnauthorizedToMint();
error InsufficientEthSent();
error ExcessiveEthSent();
error MaxSupplyExceeded();
error NumberOfMintsExceeded();
error MintingPaused();
error InvalidReferral();
error InvalidSignature();
error BalanceEmpty();
error TransferFailed();
error MaxBatchSizeExceeded();
error WrongPassword();
error LockedForever();

contract Remilia is ERC721A, Ownable {
  //
  // EVENTS
  //
  event Invited(bytes32 indexed key, bytes32 indexed cid);
  event Referral(address indexed affiliate, uint128 wad);
  event Withdrawal(address indexed src, uint128 wad);

  //
  // STRUCTS
  //
  struct Auth {
    bytes32 key;
    bytes32[] proof;
  }

  struct Config {
    string unrevealedUri;
    string baseUri;
    address affiliateSigner;
    uint32 maxSupply;
    uint32 maxBatchSize;
    uint32 affiliateFee;
    uint32 platformFee;
  }

  struct Invite {
    uint128 price;
    uint64 start;
    uint64 limit;
  }

  struct Invitelist {
    bytes32 key;
    bytes32 cid;
    Invite invite;
  }

  struct OwnerBalance {
    uint128 owner;
    uint128 platform;
  }

  //
  // VARIABLES
  //
  mapping(bytes32 => Invite) public invites;
  mapping(address => mapping(bytes32 => uint256)) private minted;
  mapping(address => uint128) public affiliateBalance;
  address private constant PLATFORM = 0x86B82972282Dd22348374bC63fd21620F7ED847B;
  // address private constant PLATFORM = 0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC; // TEST (account[2])
  bool public revealed;
  bool public uriUnlocked;
  string public provenance;
  bool public provenanceHashUnlocked;
  OwnerBalance public ownerBalance;
  Config public config;

  //
  // METHODS
  //
  constructor(

  ) ERC721A("TEST NFT", "TEST") {
  
	config.baseUri = "";
	config.affiliateSigner = 0x1f285dD528cf4cDE3081C6d48D9df7A4F8FA9383;
	config.maxSupply = 10000;
	config.maxBatchSize = 1000;
	config.affiliateFee = 1500;
	config.platformFee = 500;
	/*  
    // affiliateFee max is 50%, platformFee min is 5% and max is 50%
    if (config_.affiliateFee > 5000 || config_.platformFee > 5000 || config_.platformFee < 500) {
      revert InvalidConfig();
    }
    config = config_;*/
    revealed = false;
    uriUnlocked = true;
    provenanceHashUnlocked = true;
  }

  function mint(
    Auth calldata auth,
    uint256 quantity,
    address affiliate,
    bytes calldata signature
  ) external payable {
    Invite memory i = invites[auth.key];

    if (affiliate != address(0)) {
      if (affiliate == PLATFORM || affiliate == owner() || affiliate == msg.sender) {
        revert InvalidReferral();
      }
      validateAffiliate(affiliate, signature, config.affiliateSigner);
    }

    if (i.limit == 0) {
      revert MintingPaused();
    }

    if (!verify(auth, _msgSender())) {
      revert WalletUnauthorizedToMint();
    }

    if (block.timestamp < i.start) {
      revert MintNotYetStarted();
    }

    if (i.limit < config.maxSupply) {
      uint256 totalAfterMint = minted[_msgSender()][auth.key] + quantity;

      if (totalAfterMint > i.limit) {
        revert NumberOfMintsExceeded();
      }
    }

    if (quantity > config.maxBatchSize) {
      revert MaxBatchSizeExceeded();
    }

    if ((_totalMinted() + quantity) > config.maxSupply) {
      revert MaxSupplyExceeded();
    }

    uint256 cost = computePrice(i.price, quantity);

    if (msg.value < cost) {
      revert InsufficientEthSent();
    }

    if (msg.value > cost) {
      revert ExcessiveEthSent();
    }

    _safeMint(msg.sender, quantity);

    if (i.limit < config.maxSupply) {
      minted[_msgSender()][auth.key] += quantity;
    }

    uint128 value = uint128(msg.value);

    uint128 affiliateWad = 0;
    if (affiliate != address(0)) {
      affiliateWad = (value * config.affiliateFee) / 10000;
      affiliateBalance[affiliate] += affiliateWad;
      emit Referral(affiliate, affiliateWad);
    }

    OwnerBalance memory balance = ownerBalance;
    uint128 platformWad = (value * config.platformFee) / 10000;
    uint128 ownerWad = value - affiliateWad - platformWad;
    ownerBalance = OwnerBalance({
      owner: balance.owner + ownerWad,
      platform: balance.platform + platformWad
    });
  }

  function computePrice(uint128 price, uint256 numTokens) public pure returns (uint256){
      // 5+ = 4% off
      // 10+ = 10% off
      // 30+ = 13.33% off
      // 100+ = 20% off
      uint256 cost = price * numTokens;

      if (numTokens >= 100) {
        return cost * 8 / 10;
      } else if (numTokens >= 30) {
        return cost * 8667 / 10000;
      } else if (numTokens >= 10) {
        return cost * 9 / 10;
      } else if (numTokens >= 5) {
        return cost * 96 / 100;
      } else {
        return cost;
      }
  }

  function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
    if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

    if (revealed == false) {
      return string(abi.encodePacked(config.unrevealedUri, Strings.toString(tokenId)));
    }

    return
      bytes(config.baseUri).length != 0
        ? string(abi.encodePacked(config.baseUri, Strings.toString(tokenId)))
        : "";
  }

  function reveal() public onlyOwner {
    revealed = true;
  }

  function _startTokenId() internal view virtual override returns (uint256) {
    return 1;
  }

  /// @notice the password is "forever"
  function lockURI(string memory password) public onlyOwner {
    if (keccak256(abi.encodePacked(password)) != keccak256(abi.encodePacked("forever"))) {
      revert WrongPassword();
    }

    uriUnlocked = false;
  }

  function setUnrevealedURI(string memory _unrevealedURI) public onlyOwner {
    config.unrevealedUri = _unrevealedURI;
  }

  function setBaseURI(string memory baseUri_) public onlyOwner {
    if (!uriUnlocked) {
      revert LockedForever();
    }

    config.baseUri = baseUri_;
  }

  /// @notice Set BAYC-style provenance once it's calculated
  function setProvenanceHash(string memory provenanceHash) public onlyOwner {
    if (!provenanceHashUnlocked) {
      revert LockedForever();
    }

    provenance = provenanceHash;
  }

  /// @notice the password is "forever"
  function lockProvenanceHash(string memory password) public onlyOwner {
    if (keccak256(abi.encodePacked(password)) != keccak256(abi.encodePacked("forever"))) {
      revert WrongPassword();
    }

    provenanceHashUnlocked = false;
  }

  function withdraw() public {
    uint128 wad = 0;

    if (msg.sender == owner() || msg.sender == PLATFORM) {
      OwnerBalance memory balance = ownerBalance;
      if (msg.sender == owner()) {
        wad = balance.owner;
        ownerBalance = OwnerBalance({ owner: 0, platform: balance.platform });
      } else {
        wad = balance.platform;
        ownerBalance = OwnerBalance({ owner: balance.owner, platform: 0 });
      }
    } else {
      wad = affiliateBalance[msg.sender];
      affiliateBalance[msg.sender] = 0;
    }

    if (wad == 0) {
      revert BalanceEmpty();
    }
    (bool success, ) = msg.sender.call{ value: wad }("");
    if (!success) {
      revert TransferFailed();
    }
    emit Withdrawal(msg.sender, wad);
  }

  function setInvites(Invitelist[] calldata invitelist) external onlyOwner {
    for (uint256 i = 0; i < invitelist.length; i++) {
      Invitelist calldata list = invitelist[i];
      invites[list.key] = list.invite;
      emit Invited(list.key, list.cid);
    }
  }

  function setInvite(
    bytes32 _key,
    bytes32 _cid,
    Invite calldata _invite
  ) external onlyOwner {
    invites[_key] = _invite;
    emit Invited(_key, _cid);
  }

  // based on: https://github.com/miguelmota/merkletreejs-solidity/blob/master/contracts/MerkleProof.sol
  function verify(Auth calldata auth, address account) internal pure returns (bool) {
    if (auth.key == "") return true;

    bytes32 computedHash = keccak256(abi.encodePacked(account));
    for (uint256 i = 0; i < auth.proof.length; i++) {
      bytes32 proofElement = auth.proof[i];
      if (computedHash <= proofElement) {
        computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
      } else {
        computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
      }
    }
    return computedHash == auth.key;
  }

  function validateAffiliate(
    address affiliate,
    bytes memory signature,
    address affiliateSigner
  ) internal view {

    //console.log("affiliate");
    //console.log(affiliate);

    bytes32 signedMessagehash = ECDSA.toEthSignedMessageHash(
      keccak256(abi.encodePacked(affiliate))
    );
    address signer = ECDSA.recover(signedMessagehash, signature);

    //console.log("affiliateSigner");
    //console.log(affiliateSigner);

    //console.log("signer");
    //console.log(signer);

    if (signer != affiliateSigner) {
      revert InvalidSignature();
    }
  }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title IProxy - Helper interface to access the singleton address of the Proxy on-chain.
 * @author Richard Meissner - @rmeissner
 */
interface IProxy {
    function masterCopy() external view returns (address);
}
/**
 * @title SafeProxy - Generic proxy contract allows to execute all transactions applying the code of a master contract.
 * @author Stefan George - <[email protected]>
 * @author Richard Meissner - <[email protected]>
 */
contract SafeProxy {
    // Singleton always needs to be first declared variable, to ensure that it is at the same location in the contracts to which calls are delegated.
    // To reduce deployment costs this variable is internal and needs to be retrieved via `getStorageAt`
    address internal singleton;
    /**
     * @notice Constructor function sets address of singleton contract.
     * @param _singleton Singleton address.
     */
    constructor(address _singleton) {
        require(_singleton != address(0), "Invalid singleton address provided");
        singleton = _singleton;
    }
    /// @dev Fallback function forwards all transactions and returns all received return data.
    fallback() external payable {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let _singleton := and(sload(0), 0xffffffffffffffffffffffffffffffffffffffff)
            // 0xa619486e == keccak("masterCopy()"). The value is right padded to 32-bytes with 0s
            if eq(calldataload(0), 0xa619486e00000000000000000000000000000000000000000000000000000000) {
                mstore(0, _singleton)
                return(0, 0x20)
            }
            calldatacopy(0, 0, calldatasize())
            let success := delegatecall(gas(), _singleton, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            if eq(success, 0) {
                revert(0, returndatasize())
            }
            return(0, returndatasize())
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity 0.8.17;
import "lib/openzeppelin-contracts/contracts/proxy/Proxy.sol";
import "lib/openzeppelin-contracts/contracts/proxy/ERC1967/ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    struct StringSlot {
        string value;
    }
    struct BytesSlot {
        bytes value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
import "lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/UUPSUpgradeable.sol";
import "./Helpers.sol";
import "./lib/Structs.sol";
import "./OfferController.sol";
import "./interfaces/IBlend.sol";
import "../pool/interfaces/IBlurPool.sol";
contract Blend is IBlend, OfferController, UUPSUpgradeable {
    IExchange private immutable _EXCHANGE;
    IExchangeV2 private immutable _EXCHANGE_V2;
    IBlurPool private immutable _POOL;
    address private immutable _SELL_MATCHING_POLICY;
    address private immutable _BID_MATCHING_POLICY;
    address private immutable _DELEGATE;
    address private immutable _DELEGATE_V2;
    uint256 private constant _BASIS_POINTS = 10_000;
    uint256 private constant _MAX_AUCTION_DURATION = 432_000;
    uint256 private constant _LIQUIDATION_THRESHOLD = 100_000;
    uint256 private _nextLienId;
    mapping(uint256 => bytes32) public liens;
    mapping(bytes32 => uint256) public amountTaken;
    // required by the OZ UUPS module
    function _authorizeUpgrade(address) internal override onlyOwner {}
    constructor(
        address pool,
        address exchange,
        address exchangeV2,
        address sellMatchingPolicy,
        address bidMatchingPolicy,
        address delegate,
        address delegateV2
    ) {
        _POOL = IBlurPool(pool);
        _EXCHANGE = IExchange(exchange);
        _EXCHANGE_V2 = IExchangeV2(exchangeV2);
        _SELL_MATCHING_POLICY = sellMatchingPolicy;
        _BID_MATCHING_POLICY = bidMatchingPolicy;
        _DELEGATE = delegate;
        _DELEGATE_V2 = delegateV2;
        _disableInitializers();
    }
    function initialize() external initializer {
        __UUPSUpgradeable_init();
        __Ownable_init();
    }
    /*//////////////////////////////////////////////////
                    BORROW FLOWS
    //////////////////////////////////////////////////*/
    /**
     * @notice Verifies and takes loan offer; then transfers loan and collateral assets
     * @param offer Loan offer
     * @param signature Lender offer signature
     * @param loanAmount Loan amount in ETH
     * @param collateralTokenId Token id to provide as collateral
     * @return lienId New lien id
     */
    function borrow(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        uint256 collateralTokenId
    ) external returns (uint256 lienId) {
        lienId = _borrow(offer, signature, loanAmount, collateralTokenId);
        /* Lock collateral token. */
        offer.collection.safeTransferFrom(msg.sender, address(this), collateralTokenId);
        /* Transfer loan to borrower. */
        _POOL.transferFrom(offer.lender, msg.sender, loanAmount);
    }
    /**
     * @notice Repays loan and retrieves collateral
     * @param lien Lien preimage
     * @param lienId Lien id
     */
    function repay(
        Lien calldata lien,
        uint256 lienId
    ) external validateLien(lien, lienId) lienIsActive(lien) {
        uint256 debt = _repay(lien, lienId);
        /* Return NFT to borrower. */
        lien.collection.safeTransferFrom(address(this), lien.borrower, lien.tokenId);
        /* Repay loan to lender. */
        _POOL.transferFrom(msg.sender, lien.lender, debt);
    }
    /**
     * @notice Verifies and takes loan offer; creates new lien
     * @param offer Loan offer
     * @param signature Lender offer signature
     * @param loanAmount Loan amount in ETH
     * @param collateralTokenId Token id to provide as collateral
     * @return lienId New lien id
     */
    function _borrow(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        uint256 collateralTokenId
    ) internal returns (uint256 lienId) {
        if (offer.auctionDuration > _MAX_AUCTION_DURATION) {
            revert InvalidAuctionDuration();
        }
        Lien memory lien = Lien({
            lender: offer.lender,
            borrower: msg.sender,
            collection: offer.collection,
            tokenId: collateralTokenId,
            amount: loanAmount,
            startTime: block.timestamp,
            rate: offer.rate,
            auctionStartBlock: 0,
            auctionDuration: offer.auctionDuration
        });
        /* Create lien. */
        unchecked {
            liens[lienId = _nextLienId++] = keccak256(abi.encode(lien));
        }
        /* Take the loan offer. */
        _takeLoanOffer(offer, signature, lien, lienId);
    }
    /**
     * @notice Computes the current debt repayment and burns the lien
     * @dev Does not transfer assets
     * @param lien Lien preimage
     * @param lienId Lien id
     * @return debt Current amount of debt owed on the lien
     */
    function _repay(Lien calldata lien, uint256 lienId) internal returns (uint256 debt) {
        debt = Helpers.computeCurrentDebt(lien.amount, lien.rate, lien.startTime);
        delete liens[lienId];
        emit Repay(lienId, address(lien.collection));
    }
    /**
     * @notice Verifies and takes loan offer
     * @dev Does not transfer loan and collateral assets; does not update lien hash
     * @param offer Loan offer
     * @param signature Lender offer signature
     * @param lien Lien preimage
     * @param lienId Lien id
     */
    function _takeLoanOffer(
        LoanOffer calldata offer,
        bytes calldata signature,
        Lien memory lien,
        uint256 lienId
    ) internal {
        bytes32 hash = _hashOffer(offer);
        _validateOffer(
            hash,
            offer.lender,
            offer.oracle,
            signature,
            offer.expirationTime,
            offer.salt
        );
        if (offer.rate > _LIQUIDATION_THRESHOLD) {
            revert RateTooHigh();
        }
        if (lien.amount > offer.maxAmount || lien.amount < offer.minAmount) {
            revert InvalidLoan();
        }
        uint256 _amountTaken = amountTaken[hash];
        if (offer.totalAmount - _amountTaken < lien.amount) {
            revert InsufficientOffer();
        }
        unchecked {
            amountTaken[hash] = _amountTaken + lien.amount;
        }
        emit LoanOfferTaken(
            hash,
            lienId,
            address(offer.collection),
            lien.lender,
            lien.borrower,
            lien.amount,
            lien.rate,
            lien.tokenId,
            lien.auctionDuration
        );
    }
    /*//////////////////////////////////////////////////
                    REFINANCING FLOWS
    //////////////////////////////////////////////////*/
    /**
     * @notice Starts Dutch Auction on lien ownership
     * @dev Must be called by lien owner
     * @param lienId Lien token id
     */
    function startAuction(Lien calldata lien, uint256 lienId) external validateLien(lien, lienId) {
        if (msg.sender != lien.lender) {
            revert Unauthorized();
        }
        /* Cannot start if auction has already started. */
        if (lien.auctionStartBlock != 0) {
            revert AuctionIsActive();
        }
        /* Add auction start block to lien. */
        liens[lienId] = keccak256(
            abi.encode(
                Lien({
                    lender: lien.lender,
                    borrower: lien.borrower,
                    collection: lien.collection,
                    tokenId: lien.tokenId,
                    amount: lien.amount,
                    startTime: lien.startTime,
                    rate: lien.rate,
                    auctionStartBlock: block.number,
                    auctionDuration: lien.auctionDuration
                })
            )
        );
        emit StartAuction(lienId, address(lien.collection));
    }
    /**
     * @notice Seizes collateral from defaulted lien, skipping liens that are not defaulted
     * @param lienPointers List of lien, lienId pairs
     */
    function seize(LienPointer[] calldata lienPointers) external {
        uint256 length = lienPointers.length;
        for (uint256 i; i < length; ) {
            Lien calldata lien = lienPointers[i].lien;
            uint256 lienId = lienPointers[i].lienId;
            if (msg.sender != lien.lender) {
                revert Unauthorized();
            }
            if (!_validateLien(lien, lienId)) {
                revert InvalidLien();
            }
            /* Check that the auction has ended and lien is defaulted. */
            if (_lienIsDefaulted(lien)) {
                delete liens[lienId];
                /* Seize collateral to lender. */
                lien.collection.safeTransferFrom(address(this), lien.lender, lien.tokenId);
                emit Seize(lienId, address(lien.collection));
            }
            unchecked {
                ++i;
            }
        }
    }
    /**
     * @notice Refinances to different loan amount and repays previous loan
     * @dev Must be called by lender; previous loan must be repaid with interest
     * @param lien Lien struct
     * @param lienId Lien id
     * @param offer Loan offer
     * @param signature Offer signatures
     */
    function refinance(
        Lien calldata lien,
        uint256 lienId,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external validateLien(lien, lienId) lienIsActive(lien) {
        if (msg.sender != lien.lender) {
            revert Unauthorized();
        }
        /* Interest rate must be at least as good as current. */
        if (offer.rate > lien.rate || offer.auctionDuration != lien.auctionDuration) {
            revert InvalidRefinance();
        }
        uint256 debt = Helpers.computeCurrentDebt(lien.amount, lien.rate, lien.startTime);
        _refinance(lien, lienId, debt, offer, signature);
        /* Repay initial loan. */
        _POOL.transferFrom(offer.lender, lien.lender, debt);
    }
    /**
     * @notice Refinance lien in auction at the current debt amount where the interest rate ceiling increases over time
     * @dev Interest rate must be lower than the interest rate ceiling
     * @param lien Lien struct
     * @param lienId Lien token id
     * @param rate Interest rate (in bips)
     * @dev Formula: https://www.desmos.com/calculator/urasr71dhb
     */
    function refinanceAuction(
        Lien calldata lien,
        uint256 lienId,
        uint256 rate
    ) external validateLien(lien, lienId) auctionIsActive(lien) {
        /* Rate must be below current rate limit. */
        uint256 rateLimit = Helpers.calcRefinancingAuctionRate(
            lien.auctionStartBlock,
            lien.auctionDuration,
            lien.rate
        );
        if (rate > rateLimit) {
            revert RateTooHigh();
        }
        uint256 debt = Helpers.computeCurrentDebt(lien.amount, lien.rate, lien.startTime);
        /* Reset the lien with the new lender and interest rate. */
        liens[lienId] = keccak256(
            abi.encode(
                Lien({
                    lender: msg.sender, // set new lender
                    borrower: lien.borrower,
                    collection: lien.collection,
                    tokenId: lien.tokenId,
                    amount: debt, // new loan begins with previous debt
                    startTime: block.timestamp,
                    rate: rate,
                    auctionStartBlock: 0, // close the auction
                    auctionDuration: lien.auctionDuration
                })
            )
        );
        emit Refinance(
            lienId,
            address(lien.collection),
            msg.sender,
            debt,
            rate,
            lien.auctionDuration
        );
        /* Repay the initial loan. */
        _POOL.transferFrom(msg.sender, lien.lender, debt);
    }
    /**
     * @notice Refinances to different loan amount and repays previous loan
     * @param lien Lien struct
     * @param lienId Lien id
     * @param offer Loan offer
     * @param signature Offer signatures
     */
    function refinanceAuctionByOther(
        Lien calldata lien,
        uint256 lienId,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external validateLien(lien, lienId) auctionIsActive(lien) {
        /* Rate must be below current rate limit and auction duration must be the same. */
        uint256 rateLimit = Helpers.calcRefinancingAuctionRate(
            lien.auctionStartBlock,
            lien.auctionDuration,
            lien.rate
        );
        if (offer.rate > rateLimit || offer.auctionDuration != lien.auctionDuration) {
            revert InvalidRefinance();
        }
        uint256 debt = Helpers.computeCurrentDebt(lien.amount, lien.rate, lien.startTime);
        _refinance(lien, lienId, debt, offer, signature);
        /* Repay initial loan. */
        _POOL.transferFrom(offer.lender, lien.lender, debt);
    }
    /**
     * @notice Refinances to different loan amount and repays previous loan
     * @dev Must be called by borrower; previous loan must be repaid with interest
     * @param lien Lien struct
     * @param lienId Lien id
     * @param loanAmount New loan amount
     * @param offer Loan offer
     * @param signature Offer signatures
     */
    function borrowerRefinance(
        Lien calldata lien,
        uint256 lienId,
        uint256 loanAmount,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external validateLien(lien, lienId) lienIsActive(lien) {
        if (msg.sender != lien.borrower) {
            revert Unauthorized();
        }
        if (offer.auctionDuration > _MAX_AUCTION_DURATION) {
            revert InvalidAuctionDuration();
        }
        _refinance(lien, lienId, loanAmount, offer, signature);
        uint256 debt = Helpers.computeCurrentDebt(lien.amount, lien.rate, lien.startTime);
        if (loanAmount >= debt) {
            /* If new loan is more than the previous, repay the initial loan and send the remaining to the borrower. */
            _POOL.transferFrom(offer.lender, lien.lender, debt);
            unchecked {
                _POOL.transferFrom(offer.lender, lien.borrower, loanAmount - debt);
            }
        } else {
            /* If new loan is less than the previous, borrower must supply the difference to repay the initial loan. */
            _POOL.transferFrom(offer.lender, lien.lender, loanAmount);
            unchecked {
                _POOL.transferFrom(lien.borrower, lien.lender, debt - loanAmount);
            }
        }
    }
    function _refinance(
        Lien calldata lien,
        uint256 lienId,
        uint256 loanAmount,
        LoanOffer calldata offer,
        bytes calldata signature
    ) internal {
        if (lien.collection != offer.collection) {
            revert CollectionsDoNotMatch();
        }
        /* Update lien with new loan details. */
        Lien memory newLien = Lien({
            lender: offer.lender, // set new lender
            borrower: lien.borrower,
            collection: lien.collection,
            tokenId: lien.tokenId,
            amount: loanAmount,
            startTime: block.timestamp,
            rate: offer.rate,
            auctionStartBlock: 0, // close the auction
            auctionDuration: offer.auctionDuration
        });
        liens[lienId] = keccak256(abi.encode(newLien));
        /* Take the loan offer. */
        _takeLoanOffer(offer, signature, newLien, lienId);
        emit Refinance(
            lienId,
            address(offer.collection),
            offer.lender,
            loanAmount,
            offer.rate,
            offer.auctionDuration
        );
    }
    /*/////////////////////////////////////////////////////////////
                          MARKETPLACE FLOWS
    /////////////////////////////////////////////////////////////*/
    /**
     * @notice Purchase an NFT and use as collateral for a loan
     * @param offer Loan offer to take
     * @param signature Lender offer signature
     * @param loanAmount Loan amount in ETH
     * @param execution Marketplace execution data
     * @return lienId Lien id
     */
    function buyToBorrow(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        ExecutionV1 calldata execution
    ) public returns (uint256 lienId) {
        if (execution.makerOrder.order.trader == address(this)) {
            revert Unauthorized();
        }
        if (offer.auctionDuration > _MAX_AUCTION_DURATION) {
            revert InvalidAuctionDuration();
        }
        uint256 collateralTokenId = execution.makerOrder.order.tokenId;
        uint256 price = execution.makerOrder.order.price;
        /* Create lien. */
        Lien memory lien = Lien({
            lender: offer.lender,
            borrower: msg.sender,
            collection: offer.collection,
            tokenId: collateralTokenId,
            amount: loanAmount,
            startTime: block.timestamp,
            rate: offer.rate,
            auctionStartBlock: 0,
            auctionDuration: offer.auctionDuration
        });
        unchecked {
            liens[lienId = _nextLienId++] = keccak256(abi.encode(lien));
        }
        /* Take the loan offer. */
        _takeLoanOffer(offer, signature, lien, lienId);
        /* Create the buy side order coming from Blend. */
        Helpers.executeTakeAsk(
            offer,
            execution,
            loanAmount,
            collateralTokenId,
            price,
            _POOL,
            _EXCHANGE,
            _SELL_MATCHING_POLICY
        );
    }
    function buyToBorrowV2(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        AskExecutionV2 calldata execution
    ) public returns (uint256 lienId) {
        if (offer.auctionDuration > _MAX_AUCTION_DURATION) {
            revert InvalidAuctionDuration();
        }
        uint256 collateralTokenId = execution.listing.tokenId;
        uint256 price = execution.listing.price;
        /* Create lien. */
        Lien memory lien = Lien({
            lender: offer.lender,
            borrower: msg.sender,
            collection: offer.collection,
            tokenId: collateralTokenId,
            amount: loanAmount,
            startTime: block.timestamp,
            rate: offer.rate,
            auctionStartBlock: 0,
            auctionDuration: offer.auctionDuration
        });
        unchecked {
            liens[lienId = _nextLienId++] = keccak256(abi.encode(lien));
        }
        /* Take the loan offer. */
        _takeLoanOffer(offer, signature, lien, lienId);
        /* Execute order using ETH currently in contract. */
        Helpers.executeTakeAskV2(
            offer,
            execution,
            loanAmount,
            collateralTokenId,
            price,
            _POOL,
            _EXCHANGE_V2
        );
    }
    /**
     * @notice Purchase a locked NFT; repay the initial loan; lock the token as collateral for a new loan
     * @param lien Lien preimage struct
     * @param sellInput Sell offer and signature
     * @param loanInput Loan offer and signature
     * @return lienId Lien id
     */
    function buyToBorrowLocked(
        Lien calldata lien,
        SellInput calldata sellInput,
        LoanInput calldata loanInput,
        uint256 loanAmount
    )
        public
        validateLien(lien, sellInput.offer.lienId)
        lienIsActive(lien)
        returns (uint256 lienId)
    {
        if (lien.collection != loanInput.offer.collection) {
            revert CollectionsDoNotMatch();
        }
        (uint256 priceAfterFees, uint256 debt) = _buyLocked(
            lien,
            sellInput.offer,
            sellInput.signature
        );
        lienId = _borrow(loanInput.offer, loanInput.signature, loanAmount, lien.tokenId);
        /* Transfer funds. */
        /* Need to repay the original loan and payout any surplus from the sell or loan funds. */
        if (loanAmount < debt) {
            /* loanAmount < debt < priceAfterFees */
            /* Repay loan with funds from new lender to old lender. */
            _POOL.transferFrom(loanInput.offer.lender, lien.lender, loanAmount); // doesn't cover debt
            unchecked {
                /* Supplement difference from new borrower. */
                _POOL.transferFrom(msg.sender, lien.lender, debt - loanAmount); // cover rest of debt
                /* Send rest of sell funds to borrower. */
                _POOL.transferFrom(msg.sender, sellInput.offer.borrower, priceAfterFees - debt);
            }
        } else if (loanAmount < priceAfterFees) {
            /* debt < loanAmount < priceAfterFees */
            /* Repay loan with funds from new lender to old lender. */
            _POOL.transferFrom(loanInput.offer.lender, lien.lender, debt);
            unchecked {
                /* Send rest of loan from new lender to old borrower. */
                _POOL.transferFrom(
                    loanInput.offer.lender,
                    sellInput.offer.borrower,
                    loanAmount - debt
                );
                /* Send rest of sell funds from new borrower to old borrower. */
                _POOL.transferFrom(
                    msg.sender,
                    sellInput.offer.borrower,
                    priceAfterFees - loanAmount
                );
            }
        } else {
            /* debt < priceAfterFees < loanAmount */
            /* Repay loan with funds from new lender to old lender. */
            _POOL.transferFrom(loanInput.offer.lender, lien.lender, debt);
            unchecked {
                /* Send rest of sell funds from new lender to old borrower. */
                _POOL.transferFrom(
                    loanInput.offer.lender,
                    sellInput.offer.borrower,
                    priceAfterFees - debt
                );
                /* Send rest of loan from new lender to new borrower. */
                _POOL.transferFrom(loanInput.offer.lender, msg.sender, loanAmount - priceAfterFees);
            }
        }
    }
    /**
     * @notice Purchases a locked NFT and uses the funds to repay the loan
     * @param lien Lien preimage
     * @param offer Sell offer
     * @param signature Lender offer signature
     */
    function buyLocked(
        Lien calldata lien,
        SellOffer calldata offer,
        bytes calldata signature
    ) public validateLien(lien, offer.lienId) lienIsActive(lien) {
        (uint256 priceAfterFees, uint256 debt) = _buyLocked(lien, offer, signature);
        /* Send token to buyer. */
        lien.collection.safeTransferFrom(address(this), msg.sender, lien.tokenId);
        /* Repay lender. */
        _POOL.transferFrom(msg.sender, lien.lender, debt);
        /* Send surplus to borrower. */
        unchecked {
            _POOL.transferFrom(msg.sender, lien.borrower, priceAfterFees - debt);
        }
    }
    /**
     * @notice Takes a bid on a locked NFT and use the funds to repay the lien
     * @dev Must be called by the borrower
     * @param lien Lien preimage
     * @param lienId Lien id
     * @param execution Marketplace execution data
     */
    function takeBid(
        Lien calldata lien,
        uint256 lienId,
        ExecutionV1 calldata execution
    ) external validateLien(lien, lienId) lienIsActive(lien) {
        if (execution.makerOrder.order.trader == address(this) || msg.sender != lien.borrower) {
            revert Unauthorized();
        }
        /* Repay loan with funds received from the sale. */
        uint256 debt = _repay(lien, lienId);
        Helpers.executeTakeBid(
            lien,
            lienId,
            execution,
            debt,
            _POOL,
            _EXCHANGE,
            _DELEGATE,
            _BID_MATCHING_POLICY
        );
    }
    function takeBidV2(
        Lien calldata lien,
        uint256 lienId,
        BidExecutionV2 calldata execution
    ) external validateLien(lien, lienId) lienIsActive(lien) {
        if (msg.sender != lien.borrower) {
            revert Unauthorized();
        }
        /* Repay loan with funds received from the sale. */
        uint256 debt = _repay(lien, lienId);
        Helpers.executeTakeBidV2(lien, execution, debt, _POOL, _EXCHANGE_V2, _DELEGATE_V2);
    }
    /**
     * @notice Verify and take sell offer for token locked in lien; use the funds to repay the debt on the lien
     * @dev Does not transfer assets
     * @param lien Lien preimage
     * @param offer Loan offer
     * @param signature Loan offer signature
     * @return priceAfterFees Price of the token (after fees), debt Current debt amount
     */
    function _buyLocked(
        Lien calldata lien,
        SellOffer calldata offer,
        bytes calldata signature
    ) internal returns (uint256 priceAfterFees, uint256 debt) {
        if (lien.borrower != offer.borrower) {
            revert Unauthorized();
        }
        priceAfterFees = _takeSellOffer(offer, signature);
        /* Repay loan with funds received from the sale. */
        debt = _repay(lien, offer.lienId);
        if (priceAfterFees < debt) {
            revert InvalidRepayment();
        }
        emit BuyLocked(
            offer.lienId,
            address(lien.collection),
            msg.sender,
            lien.borrower,
            lien.tokenId
        );
    }
    /**
     * @notice Validates, fulfills, and transfers fees on sell offer
     * @param sellOffer Sell offer
     * @param sellSignature Sell offer signature
     */
    function _takeSellOffer(
        SellOffer calldata sellOffer,
        bytes calldata sellSignature
    ) internal returns (uint256 priceAfterFees) {
        _validateOffer(
            _hashSellOffer(sellOffer),
            sellOffer.borrower,
            sellOffer.oracle,
            sellSignature,
            sellOffer.expirationTime,
            sellOffer.salt
        );
        /* Mark the sell offer as fulfilled. */
        cancelledOrFulfilled[sellOffer.borrower][sellOffer.salt] = 1;
        /* Transfer fees. */
        uint256 totalFees = _transferFees(sellOffer.fees, msg.sender, sellOffer.price);
        unchecked {
            priceAfterFees = sellOffer.price - totalFees;
        }
    }
    function _transferFees(
        Fee[] calldata fees,
        address from,
        uint256 price
    ) internal returns (uint256 totalFee) {
        uint256 feesLength = fees.length;
        for (uint256 i = 0; i < feesLength; ) {
            uint256 fee = (price * fees[i].rate) / _BASIS_POINTS;
            _POOL.transferFrom(from, fees[i].recipient, fee);
            totalFee += fee;
            unchecked {
                ++i;
            }
        }
        if (totalFee > price) {
            revert FeesTooHigh();
        }
    }
    receive() external payable {
        if (msg.sender != address(_POOL) && msg.sender != address(_EXCHANGE_V2)) {
            revert Unauthorized();
        }
    }
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external pure returns (bytes4) {
        return this.onERC721Received.selector;
    }
    /*/////////////////////////////////////////////////////////////
                        PAYABLE WRAPPERS
    /////////////////////////////////////////////////////////////*/
    /**
     * @notice buyToBorrow wrapper that deposits ETH to pool
     */
    function buyToBorrowETH(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        ExecutionV1 calldata execution
    ) external payable returns (uint256 lienId) {
        _POOL.deposit{ value: msg.value }(msg.sender);
        return buyToBorrow(offer, signature, loanAmount, execution);
    }
    /**
     * @notice buyToBorrow wrapper that deposits ETH to pool
     */
    function buyToBorrowV2ETH(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        AskExecutionV2 calldata execution
    ) external payable returns (uint256 lienId) {
        _POOL.deposit{ value: msg.value }(msg.sender);
        return buyToBorrowV2(offer, signature, loanAmount, execution);
    }
    /**
     * @notice buyToBorrowLocked wrapper that deposits ETH to pool
     */
    function buyToBorrowLockedETH(
        Lien calldata lien,
        SellInput calldata sellInput,
        LoanInput calldata loanInput,
        uint256 loanAmount
    ) external payable returns (uint256 lienId) {
        _POOL.deposit{ value: msg.value }(msg.sender);
        return buyToBorrowLocked(lien, sellInput, loanInput, loanAmount);
    }
    /**
     * @notice buyLocked wrapper that deposits ETH to pool
     */
    function buyLockedETH(
        Lien calldata lien,
        SellOffer calldata offer,
        bytes calldata signature
    ) external payable {
        _POOL.deposit{ value: msg.value }(msg.sender);
        return buyLocked(lien, offer, signature);
    }
    /*/////////////////////////////////////////////////////////////
                        VALIDATION MODIFIERS
    /////////////////////////////////////////////////////////////*/
    modifier validateLien(Lien calldata lien, uint256 lienId) {
        if (!_validateLien(lien, lienId)) {
            revert InvalidLien();
        }
        _;
    }
    modifier lienIsActive(Lien calldata lien) {
        if (_lienIsDefaulted(lien)) {
            revert LienIsDefaulted();
        }
        _;
    }
    modifier auctionIsActive(Lien calldata lien) {
        if (!_auctionIsActive(lien)) {
            revert AuctionIsNotActive();
        }
        _;
    }
    function _validateLien(Lien calldata lien, uint256 lienId) internal view returns (bool) {
        return liens[lienId] == keccak256(abi.encode(lien));
    }
    function _lienIsDefaulted(Lien calldata lien) internal view returns (bool) {
        return
            lien.auctionStartBlock != 0 &&
            lien.auctionStartBlock + lien.auctionDuration < block.number;
    }
    function _auctionIsActive(Lien calldata lien) internal view returns (bool) {
        return
            lien.auctionStartBlock != 0 &&
            lien.auctionStartBlock + lien.auctionDuration >= block.number;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/UUPSUpgradeable.sol)
pragma solidity ^0.8.0;
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";
/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }
    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);
    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }
    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }
    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }
    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
import "lib/solmate/src/utils/SignedWadMath.sol";
import { InvalidRepayment } from "./lib/Errors.sol";
import "./lib/Structs.sol";
import "../pool/interfaces/IBlurPool.sol";
import { IBlurExchangeV2 as IExchangeV2 } from "../exchangeV2/interfaces/IBlurExchangeV2.sol";
import { Order as OrderV1, SignatureVersion, Side } from "../exchangeV1/lib/OrderStructs.sol";
import {
    TakeAskSingle,
    TakeBidSingle,
    FeeRate,
    Taker,
    Exchange,
    Order as OrderV2,
    AssetType
} from "../exchangeV2/lib/Structs.sol";
interface IExchange {
    function execute(Input calldata sell, Input calldata buy) external payable;
}
library Helpers {
    int256 private constant _YEAR_WAD = 365 days * 1e18;
    uint256 private constant _LIQUIDATION_THRESHOLD = 100_000;
    uint256 private constant _BASIS_POINTS = 10_000;
    error InvalidExecution();
    /**
     * @dev Computes the current debt of a borrow given the last time it was touched and the last computed debt.
     * @param amount Principal in ETH
     * @param startTime Start time of the loan
     * @param rate Interest rate (in bips)
     * @dev Formula: https://www.desmos.com/calculator/l6omp0rwnh
     */
    function computeCurrentDebt(
        uint256 amount,
        uint256 rate,
        uint256 startTime
    ) public view returns (uint256) {
        uint256 loanTime = block.timestamp - startTime;
        int256 yearsWad = wadDiv(int256(loanTime) * 1e18, _YEAR_WAD);
        return uint256(wadMul(int256(amount), wadExp(wadMul(yearsWad, bipsToSignedWads(rate)))));
    }
    /**
     * @dev Calculates the current maximum interest rate a specific refinancing
     * auction could settle at currently given the auction's start block and duration.
     * @param startBlock The block the auction started at
     * @param oldRate Previous interest rate (in bips)
     * @dev Formula: https://www.desmos.com/calculator/urasr71dhb
     */
    function calcRefinancingAuctionRate(
        uint256 startBlock,
        uint256 auctionDuration,
        uint256 oldRate
    ) public view returns (uint256) {
        uint256 currentAuctionBlock = block.number - startBlock;
        int256 oldRateWads = bipsToSignedWads(oldRate);
        uint256 auctionT1 = auctionDuration / 5;
        uint256 auctionT2 = (4 * auctionDuration) / 5;
        int256 maxRateWads;
        {
            int256 aInverse = -bipsToSignedWads(15000);
            int256 b = 2;
            int256 maxMinRateWads = bipsToSignedWads(500);
            if (oldRateWads < -((b * aInverse) / 2)) {
                maxRateWads = maxMinRateWads + (oldRateWads ** 2) / aInverse + b * oldRateWads;
            } else {
                maxRateWads = maxMinRateWads - ((b ** 2) * aInverse) / 4;
            }
        }
        int256 startSlope = maxRateWads / int256(auctionT1); // wad-bips per block
        int256 middleSlope = bipsToSignedWads(9000) / int256((3 * auctionDuration) / 5) + 1; // wad-bips per block (add one to account for rounding)
        int256 middleB = maxRateWads - int256(auctionT1) * middleSlope;
        if (currentAuctionBlock < auctionT1) {
            return signedWadsToBips(startSlope * int256(currentAuctionBlock));
        } else if (currentAuctionBlock < auctionT2) {
            return signedWadsToBips(middleSlope * int256(currentAuctionBlock) + middleB);
        } else if (currentAuctionBlock < auctionDuration) {
            int256 endSlope;
            int256 endB;
            {
                endSlope =
                    (bipsToSignedWads(_LIQUIDATION_THRESHOLD) -
                        ((int256(auctionT2) * middleSlope) + middleB)) /
                    int256(auctionDuration - auctionT2); // wad-bips per block
                endB =
                    bipsToSignedWads(_LIQUIDATION_THRESHOLD) -
                    int256(auctionDuration) *
                    endSlope;
            }
            return signedWadsToBips(endSlope * int256(currentAuctionBlock) + endB);
        } else {
            return _LIQUIDATION_THRESHOLD;
        }
    }
    /**
     * @dev Converts an integer bips value to a signed wad value.
     */
    function bipsToSignedWads(uint256 bips) public pure returns (int256) {
        return int256((bips * 1e18) / _BASIS_POINTS);
    }
    /**
     * @dev Converts a signed wad value to an integer bips value.
     */
    function signedWadsToBips(int256 wads) public pure returns (uint256) {
        return uint256((wads * int256(_BASIS_POINTS)) / 1e18);
    }
    function executeTakeBid(
        Lien calldata lien,
        uint256 lienId,
        ExecutionV1 calldata execution,
        uint256 debt,
        IBlurPool pool,
        IExchange exchange,
        address delegate,
        address matchingPolicy
    ) external {
        /* Create sell side order from Blend. */
        OrderV1 memory sellOrder = OrderV1({
            trader: address(this),
            side: Side.Sell,
            matchingPolicy: matchingPolicy,
            collection: address(lien.collection),
            tokenId: lien.tokenId,
            amount: 1,
            paymentToken: address(pool),
            price: execution.makerOrder.order.price,
            listingTime: execution.makerOrder.order.listingTime + 1, // listingTime determines maker/taker
            expirationTime: type(uint256).max,
            fees: new Fee[](0),
            salt: lienId, // prevent reused order hash
            extraParams: "\\x01" // require oracle signature
        });
        Input memory sell = Input({
            order: sellOrder,
            v: 0,
            r: bytes32(0),
            s: bytes32(0),
            extraSignature: execution.extraSignature,
            signatureVersion: SignatureVersion.Single,
            blockNumber: execution.blockNumber
        });
        /* Execute marketplace order. */
        uint256 balanceBefore = pool.balanceOf(address(this));
        lien.collection.approve(delegate, lien.tokenId);
        exchange.execute(sell, execution.makerOrder);
        /* Determine the funds received from the sale (after fees). */
        uint256 amountReceivedFromSale = pool.balanceOf(address(this)) - balanceBefore;
        if (amountReceivedFromSale < debt) {
            revert InvalidRepayment();
        }
        /* Repay lender. */
        pool.transferFrom(address(this), lien.lender, debt);
        /* Send surplus to borrower. */
        unchecked {
            pool.transferFrom(address(this), lien.borrower, amountReceivedFromSale - debt);
        }
    }
    function executeTakeAskV2(
        LoanOffer calldata offer, 
        AskExecutionV2 calldata execution,
        uint256 loanAmount,
        uint256 collateralTokenId,
        uint256 price,
        IBlurPool pool,
        IExchangeV2 exchangeV2
    ) external {
        OrderV2 calldata order = execution.order;
        if (address(offer.collection) != order.collection || order.assetType != AssetType.ERC721) {
            revert InvalidExecution();
        }
        /* Transfer funds. */
        /* Need to retrieve the ETH to fund the marketplace execution. */
        if (loanAmount < price) {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), loanAmount);
            /* Supplement difference from borrower. */
            unchecked {
                pool.withdrawFrom(msg.sender, address(this), price - loanAmount);
            }
        } else {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), price);
            /* Send surplus to borrower. */
            unchecked {
                pool.transferFrom(offer.lender, msg.sender, loanAmount - price);
            }
        }
        TakeAskSingle memory execute = TakeAskSingle({
            order: execution.order,
            exchange: Exchange({
                index: 0,
                proof: execution.proof,
                listing: Listing({
                    index: execution.listing.index,
                    tokenId: collateralTokenId,
                    amount: 1,
                    price: price
                }),
                taker: Taker({ tokenId: collateralTokenId, amount: 1 })
            }),
            takerFee: FeeRate(address(0), 0),
            signature: execution.signature,
            tokenRecipient: address(this)
        });
        exchangeV2.takeAskSingle{ value: price }(execute, execution.oracleSignature);
    }
    function executeTakeAsk(
        LoanOffer calldata offer,
        ExecutionV1 calldata execution,
        uint256 loanAmount,
        uint256 collateralTokenId,
        uint256 price,
        IBlurPool pool,
        IExchange exchange,
        address matchingPolicy
    ) external {
        /* Transfer funds. */
        /* Need to retrieve the ETH to fund the marketplace execution. */
        if (loanAmount < price) {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), loanAmount);
            /* Supplement difference from borrower. */
            unchecked {
                pool.withdrawFrom(msg.sender, address(this), price - loanAmount);
            }
        } else {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), price);
            /* Send surplus to borrower. */
            unchecked {
                pool.transferFrom(offer.lender, msg.sender, loanAmount - price);
            }
        }
        OrderV1 memory buyOrder = OrderV1({
            trader: address(this),
            side: Side.Buy,
            matchingPolicy: matchingPolicy,
            collection: address(offer.collection),
            tokenId: collateralTokenId,
            amount: 1,
            paymentToken: address(0),
            price: price,
            listingTime: execution.makerOrder.order.listingTime + 1, // listingTime determines maker/taker
            expirationTime: type(uint256).max,
            fees: new Fee[](0),
            salt: uint160(execution.makerOrder.order.trader), // prevent reused order hash
            extraParams: "\\x01" // require oracle signature
        });
        Input memory buy = Input({
            order: buyOrder,
            v: 0,
            r: bytes32(0),
            s: bytes32(0),
            extraSignature: execution.extraSignature,
            signatureVersion: SignatureVersion.Single,
            blockNumber: execution.blockNumber
        });
        /* Execute order using ETH currently in contract. */
        exchange.execute{ value: price }(execution.makerOrder, buy);
    }
    function executeTakeBidV2(
        Lien calldata lien,
        BidExecutionV2 calldata execution,
        uint256 debt,
        IBlurPool pool,
        IExchangeV2 exchangeV2,
        address delegateV2
    ) external {
        OrderV2 calldata order = execution.order;
        if (address(lien.collection) != order.collection || order.assetType != AssetType.ERC721) {
            revert InvalidExecution();
        }
        uint256 balanceBefore = pool.balanceOf(address(this));
        TakeBidSingle memory execute = TakeBidSingle({
            order: execution.order,
            exchange: Exchange({
                index: 0,
                proof: execution.proof,
                listing: execution.listing,
                taker: Taker({ tokenId: lien.tokenId, amount: 1 })
            }),
            takerFee: FeeRate(address(0), 0),
            signature: execution.signature
        });
        /* Execute marketplace order. */
        lien.collection.approve(delegateV2, lien.tokenId);
        exchangeV2.takeBidSingle(execute, execution.oracleSignature);
        /* Determine the funds received from the sale (after fees). */
        uint256 amountReceivedFromSale = pool.balanceOf(address(this)) - balanceBefore;
        if (amountReceivedFromSale < debt) {
            revert InvalidRepayment();
        }
        /* Repay lender. */
        pool.transferFrom(address(this), lien.lender, debt);
        /* Send surplus to borrower. */
        unchecked {
            pool.transferFrom(address(this), lien.borrower, amountReceivedFromSale - debt);
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "lib/solmate/src/tokens/ERC721.sol";
import { Input, Fee } from "../../exchangeV1/lib/OrderStructs.sol";
import { Order as OrderV2, Listing } from "../../exchangeV2/lib/Structs.sol";
struct LienPointer {
    Lien lien;
    uint256 lienId;
}
struct SellOffer {
    address borrower;
    uint256 lienId;
    uint256 price;
    uint256 expirationTime;
    uint256 salt;
    address oracle;
    Fee[] fees;
}
struct Lien {
    address lender;
    address borrower;
    ERC721 collection;
    uint256 tokenId;
    uint256 amount;
    uint256 startTime;
    uint256 rate;
    uint256 auctionStartBlock;
    uint256 auctionDuration;
}
struct LoanOffer {
    address lender;
    ERC721 collection;
    uint256 totalAmount;
    uint256 minAmount;
    uint256 maxAmount;
    uint256 auctionDuration;
    uint256 salt;
    uint256 expirationTime;
    uint256 rate;
    address oracle;
}
struct LoanInput {
    LoanOffer offer;
    bytes signature;
}
struct SellInput {
    SellOffer offer;
    bytes signature;
}
struct ExecutionV1 {
    Input makerOrder;
    bytes extraSignature;
    uint256 blockNumber;
}
struct BidExecutionV2 {
    OrderV2 order;
    Listing listing;
    bytes32[] proof;
    bytes signature;
    bytes oracleSignature;
}
struct AskExecutionV2 {
    OrderV2 order;
    Listing listing;
    bytes32[] proof;
    bytes signature;
    bytes oracleSignature;
}
// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
import "lib/openzeppelin-contracts-upgradeable/contracts/access/Ownable2StepUpgradeable.sol";
import "./lib/Signatures.sol";
import "./interfaces/IOfferController.sol";
abstract contract OfferController is IOfferController, Signatures, Ownable2StepUpgradeable {
    mapping(address => mapping(uint256 => uint256)) public cancelledOrFulfilled;
    uint256[50] private _gap;
    /**
     * @notice Assert offer validity
     * @param offerHash Offer hash
     * @param signer Address of offer signer
     * @param oracle Address of oracle
     * @param signature Packed signature array
     * @param expirationTime Offer expiration time
     * @param salt Offer salt
     */
    function _validateOffer(
        bytes32 offerHash,
        address signer,
        address oracle,
        bytes calldata signature,
        uint256 expirationTime,
        uint256 salt
    ) internal view {
        _verifyOfferAuthorization(offerHash, signer, oracle, signature);
        if (expirationTime < block.timestamp) {
            revert OfferExpired();
        }
        if (cancelledOrFulfilled[signer][salt] == 1) {
            revert OfferUnavailable();
        }
    }
    /*/////////////////////////////////////////
                  CANCEL FUNCTIONS
    /////////////////////////////////////////*/
    /**
     * @notice Cancels offer salt for caller
     * @param salt Unique offer salt
     */
    function cancelOffer(uint256 salt) external {
        _cancelOffer(msg.sender, salt);
    }
    /**
     * @notice Cancels offers in bulk for caller
     * @param salts List of offer salts
     */
    function cancelOffers(uint256[] calldata salts) external {
        uint256 saltsLength = salts.length;
        for (uint256 i; i < saltsLength; ) {
            _cancelOffer(msg.sender, salts[i]);
            unchecked {
                ++i;
            }
        }
    }
    /**
     * @notice Cancels all offers by incrementing caller nonce
     */
    function incrementNonce() external {
        _incrementNonce(msg.sender);
    }
    /**
     * @notice Cancel offer by user and salt
     * @param user Address of user
     * @param salt Unique offer salt
     */
    function _cancelOffer(address user, uint256 salt) private {
        cancelledOrFulfilled[user][salt] = 1;
        emit OfferCancelled(user, salt);
    }
    /**
     * @notice Cancel all orders by incrementing the user nonce
     * @param user Address of user
     */
    function _incrementNonce(address user) internal {
        emit NonceIncremented(user, ++nonces[user]);
    }
    /*/////////////////////////////////////////
                  ADMIN FUNCTIONS
    /////////////////////////////////////////*/
    /**
     * @notice Set approval for an oracle address
     * @param oracle Address of oracle
     * @param approved Whether the oracle is approved
     */
    function setOracle(address oracle, bool approved) external onlyOwner {
        if (approved) {
            oracles[oracle] = 1;
        } else {
            oracles[oracle] = 0;
        }
    }
    /**
     * @notice Set the block range expiry of oracle signatures
     * @param _blockRange Block range
     */
    function setBlockRange(uint256 _blockRange) external onlyOwner {
        blockRange = _blockRange;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../lib/Structs.sol";
import "./IOfferController.sol";
interface IBlend is IOfferController {
    event LoanOfferTaken(
        bytes32 offerHash,
        uint256 lienId,
        address collection,
        address lender,
        address borrower,
        uint256 loanAmount,
        uint256 rate,
        uint256 tokenId,
        uint256 auctionDuration
    );
    event Repay(uint256 lienId, address collection);
    event StartAuction(uint256 lienId, address collection);
    event Refinance(
        uint256 lienId,
        address collection,
        address newLender,
        uint256 newAmount,
        uint256 newRate,
        uint256 newAuctionDuration
    );
    event Seize(uint256 lienId, address collection);
    event BuyLocked(
        uint256 lienId,
        address collection,
        address buyer,
        address seller,
        uint256 tokenId
    );
    function amountTaken(bytes32 offerHash) external view returns (uint256);
    function liens(uint256 lienId) external view returns (bytes32);
    /*//////////////////////////////////////////////////
                    BORROW FLOWS
    //////////////////////////////////////////////////*/
    function borrow(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        uint256 collateralId
    ) external returns (uint256 lienId);
    function repay(Lien calldata lien, uint256 lienId) external;
    /*//////////////////////////////////////////////////
                    REFINANCING FLOWS
    //////////////////////////////////////////////////*/
    function startAuction(Lien calldata lien, uint256 lienId) external;
    function seize(LienPointer[] calldata lienPointers) external;
    function refinance(
        Lien calldata lien,
        uint256 lienId,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external;
    function refinanceAuction(Lien calldata lien, uint256 lienId, uint256 rate) external;
    function refinanceAuctionByOther(
        Lien calldata lien,
        uint256 lienId,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external;
    function borrowerRefinance(
        Lien calldata lien,
        uint256 lienId,
        uint256 loanAmount,
        LoanOffer calldata offer,
        bytes calldata signature
    ) external;
    /*//////////////////////////////////////////////////
                    MARKETPLACE FLOWS
    //////////////////////////////////////////////////*/
    function buyToBorrow(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        ExecutionV1 calldata execution
    ) external returns (uint256 lienId);
    function buyToBorrowETH(
        LoanOffer calldata offer,
        bytes calldata signature,
        uint256 loanAmount,
        ExecutionV1 calldata execution
    ) external payable returns (uint256 lienId);
    function buyToBorrowLocked(
        Lien calldata lien,
        SellInput calldata sellInput,
        LoanInput calldata loanInput,
        uint256 loanAmount
    ) external returns (uint256 lienId);
    function buyToBorrowLockedETH(
        Lien calldata lien,
        SellInput calldata sellInput,
        LoanInput calldata loanInput,
        uint256 loanAmount
    ) external payable returns (uint256 lienId);
    function buyLocked(
        Lien calldata lien,
        SellOffer calldata offer,
        bytes calldata signature
    ) external;
    function buyLockedETH(
        Lien calldata lien,
        SellOffer calldata offer,
        bytes calldata signature
    ) external payable;
    function takeBid(Lien calldata lien, uint256 lienId, ExecutionV1 calldata execution) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IBlurPool {
    event Transfer(address indexed from, address indexed to, uint256 amount);
    function initialize() external;
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address user) external view returns (uint256);
    function deposit() external payable;
    function deposit(address user) external payable;
    function withdraw(uint256 amount) external;
    function withdrawFrom(address from, address to, uint256 amount) external;
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }
    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function _functionDelegateCall(address target, bytes memory data) private returns (bytes memory) {
        require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.2;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);
    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }
    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }
    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (interfaces/IERC1967.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.9._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;
/// @notice Signed 18 decimal fixed point (wad) arithmetic library.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SignedWadMath.sol)
/// @author Modified from Remco Bloemen (https://xn--2-umb.com/22/exp-ln/index.html)
/// @dev Will not revert on overflow, only use where overflow is not possible.
function toWadUnsafe(uint256 x) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18.
        r := mul(x, 1000000000000000000)
    }
}
/// @dev Takes an integer amount of seconds and converts it to a wad amount of days.
/// @dev Will not revert on overflow, only use where overflow is not possible.
/// @dev Not meant for negative second amounts, it assumes x is positive.
function toDaysWadUnsafe(uint256 x) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18 and then divide it by 86400.
        r := div(mul(x, 1000000000000000000), 86400)
    }
}
/// @dev Takes a wad amount of days and converts it to an integer amount of seconds.
/// @dev Will not revert on overflow, only use where overflow is not possible.
/// @dev Not meant for negative day amounts, it assumes x is positive.
function fromDaysWadUnsafe(int256 x) pure returns (uint256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 86400 and then divide it by 1e18.
        r := div(mul(x, 86400), 1000000000000000000)
    }
}
/// @dev Will not revert on overflow, only use where overflow is not possible.
function unsafeWadMul(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by y and divide by 1e18.
        r := sdiv(mul(x, y), 1000000000000000000)
    }
}
/// @dev Will return 0 instead of reverting if y is zero and will
/// not revert on overflow, only use where overflow is not possible.
function unsafeWadDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18 and divide it by y.
        r := sdiv(mul(x, 1000000000000000000), y)
    }
}
function wadMul(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Store x * y in r for now.
        r := mul(x, y)
        // Equivalent to require(x == 0 || (x * y) / x == y)
        if iszero(or(iszero(x), eq(sdiv(r, x), y))) {
            revert(0, 0)
        }
        // Scale the result down by 1e18.
        r := sdiv(r, 1000000000000000000)
    }
}
function wadDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Store x * 1e18 in r for now.
        r := mul(x, 1000000000000000000)
        // Equivalent to require(y != 0 && ((x * 1e18) / 1e18 == x))
        if iszero(and(iszero(iszero(y)), eq(sdiv(r, 1000000000000000000), x))) {
            revert(0, 0)
        }
        // Divide r by y.
        r := sdiv(r, y)
    }
}
/// @dev Will not work with negative bases, only use when x is positive.
function wadPow(int256 x, int256 y) pure returns (int256) {
    // Equivalent to x to the power of y because x ** y = (e ** ln(x)) ** y = e ** (ln(x) * y)
    return wadExp((wadLn(x) * y) / 1e18); // Using ln(x) means x must be greater than 0.
}
function wadExp(int256 x) pure returns (int256 r) {
    unchecked {
        // When the result is < 0.5 we return zero. This happens when
        // x <= floor(log(0.5e18) * 1e18) ~ -42e18
        if (x <= -42139678854452767551) return 0;
        // When the result is > (2**255 - 1) / 1e18 we can not represent it as an
        // int. This happens when x >= floor(log((2**255 - 1) / 1e18) * 1e18) ~ 135.
        if (x >= 135305999368893231589) revert("EXP_OVERFLOW");
        // x is now in the range (-42, 136) * 1e18. Convert to (-42, 136) * 2**96
        // for more intermediate precision and a binary basis. This base conversion
        // is a multiplication by 1e18 / 2**96 = 5**18 / 2**78.
        x = (x << 78) / 5**18;
        // Reduce range of x to (-½ ln 2, ½ ln 2) * 2**96 by factoring out powers
        // of two such that exp(x) = exp(x') * 2**k, where k is an integer.
        // Solving this gives k = round(x / log(2)) and x' = x - k * log(2).
        int256 k = ((x << 96) / 54916777467707473351141471128 + 2**95) >> 96;
        x = x - k * 54916777467707473351141471128;
        // k is in the range [-61, 195].
        // Evaluate using a (6, 7)-term rational approximation.
        // p is made monic, we'll multiply by a scale factor later.
        int256 y = x + 1346386616545796478920950773328;
        y = ((y * x) >> 96) + 57155421227552351082224309758442;
        int256 p = y + x - 94201549194550492254356042504812;
        p = ((p * y) >> 96) + 28719021644029726153956944680412240;
        p = p * x + (4385272521454847904659076985693276 << 96);
        // We leave p in 2**192 basis so we don't need to scale it back up for the division.
        int256 q = x - 2855989394907223263936484059900;
        q = ((q * x) >> 96) + 50020603652535783019961831881945;
        q = ((q * x) >> 96) - 533845033583426703283633433725380;
        q = ((q * x) >> 96) + 3604857256930695427073651918091429;
        q = ((q * x) >> 96) - 14423608567350463180887372962807573;
        q = ((q * x) >> 96) + 26449188498355588339934803723976023;
        /// @solidity memory-safe-assembly
        assembly {
            // Div in assembly because solidity adds a zero check despite the unchecked.
            // The q polynomial won't have zeros in the domain as all its roots are complex.
            // No scaling is necessary because p is already 2**96 too large.
            r := sdiv(p, q)
        }
        // r should be in the range (0.09, 0.25) * 2**96.
        // We now need to multiply r by:
        // * the scale factor s = ~6.031367120.
        // * the 2**k factor from the range reduction.
        // * the 1e18 / 2**96 factor for base conversion.
        // We do this all at once, with an intermediate result in 2**213
        // basis, so the final right shift is always by a positive amount.
        r = int256((uint256(r) * 3822833074963236453042738258902158003155416615667) >> uint256(195 - k));
    }
}
function wadLn(int256 x) pure returns (int256 r) {
    unchecked {
        require(x > 0, "UNDEFINED");
        // We want to convert x from 10**18 fixed point to 2**96 fixed point.
        // We do this by multiplying by 2**96 / 10**18. But since
        // ln(x * C) = ln(x) + ln(C), we can simply do nothing here
        // and add ln(2**96 / 10**18) at the end.
        /// @solidity memory-safe-assembly
        assembly {
            r := shl(7, lt(0xffffffffffffffffffffffffffffffff, x))
            r := or(r, shl(6, lt(0xffffffffffffffff, shr(r, x))))
            r := or(r, shl(5, lt(0xffffffff, shr(r, x))))
            r := or(r, shl(4, lt(0xffff, shr(r, x))))
            r := or(r, shl(3, lt(0xff, shr(r, x))))
            r := or(r, shl(2, lt(0xf, shr(r, x))))
            r := or(r, shl(1, lt(0x3, shr(r, x))))
            r := or(r, lt(0x1, shr(r, x)))
        }
        // Reduce range of x to (1, 2) * 2**96
        // ln(2^k * x) = k * ln(2) + ln(x)
        int256 k = r - 96;
        x <<= uint256(159 - k);
        x = int256(uint256(x) >> 159);
        // Evaluate using a (8, 8)-term rational approximation.
        // p is made monic, we will multiply by a scale factor later.
        int256 p = x + 3273285459638523848632254066296;
        p = ((p * x) >> 96) + 24828157081833163892658089445524;
        p = ((p * x) >> 96) + 43456485725739037958740375743393;
        p = ((p * x) >> 96) - 11111509109440967052023855526967;
        p = ((p * x) >> 96) - 45023709667254063763336534515857;
        p = ((p * x) >> 96) - 14706773417378608786704636184526;
        p = p * x - (795164235651350426258249787498 << 96);
        // We leave p in 2**192 basis so we don't need to scale it back up for the division.
        // q is monic by convention.
        int256 q = x + 5573035233440673466300451813936;
        q = ((q * x) >> 96) + 71694874799317883764090561454958;
        q = ((q * x) >> 96) + 283447036172924575727196451306956;
        q = ((q * x) >> 96) + 401686690394027663651624208769553;
        q = ((q * x) >> 96) + 204048457590392012362485061816622;
        q = ((q * x) >> 96) + 31853899698501571402653359427138;
        q = ((q * x) >> 96) + 909429971244387300277376558375;
        /// @solidity memory-safe-assembly
        assembly {
            // Div in assembly because solidity adds a zero check despite the unchecked.
            // The q polynomial is known not to have zeros in the domain.
            // No scaling required because p is already 2**96 too large.
            r := sdiv(p, q)
        }
        // r is in the range (0, 0.125) * 2**96
        // Finalization, we need to:
        // * multiply by the scale factor s = 5.549…
        // * add ln(2**96 / 10**18)
        // * add k * ln(2)
        // * multiply by 10**18 / 2**96 = 5**18 >> 78
        // mul s * 5e18 * 2**96, base is now 5**18 * 2**192
        r *= 1677202110996718588342820967067443963516166;
        // add ln(2) * k * 5e18 * 2**192
        r += 16597577552685614221487285958193947469193820559219878177908093499208371 * k;
        // add ln(2**96 / 10**18) * 5e18 * 2**192
        r += 600920179829731861736702779321621459595472258049074101567377883020018308;
        // base conversion: mul 2**18 / 2**192
        r >>= 174;
    }
}
/// @dev Will return 0 instead of reverting if y is zero.
function unsafeDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Divide x by y.
        r := sdiv(x, y)
    }
}
// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
// Blend
error Unauthorized();
error InvalidLoan();
error InvalidLien();
error InsufficientOffer();
error InvalidRepayment();
error LienIsDefaulted();
error LienNotDefaulted();
error AuctionIsActive();
error AuctionIsNotActive();
error InvalidRefinance();
error RateTooHigh();
error FeesTooHigh();
error CollectionsDoNotMatch();
error InvalidAuctionDuration();
// OfferController
error OfferExpired();
error OfferUnavailable();
// Signatures
error UnauthorizedOracle();
error SignatureExpired();
error InvalidSignature();
error InvalidVParameter();
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    Order,
    Exchange,
    Fees,
    FeeRate,
    AssetType,
    OrderType,
    Transfer,
    FungibleTransfers,
    StateUpdate,
    Cancel,
    Listing
} from "../lib/Structs.sol";
interface IBlurExchangeV2 {
    error InsufficientFunds();
    error TokenTransferFailed();
    error InvalidOrder();
    error ProtocolFeeTooHigh();
    event NewProtocolFee(address indexed recipient, uint16 indexed rate);
    event NewGovernor(address indexed governor);
    event NewBlockRange(uint256 blockRange);
    event CancelTrade(address indexed user, bytes32 hash, uint256 index, uint256 amount);
    event NonceIncremented(address indexed user, uint256 newNonce);
    event SetOracle(address indexed user, bool approved);
    function initialize() external;
    function setProtocolFee(address recipient, uint16 rate) external;
    function setGovernor(address _governor) external;
    function setOracle(address oracle, bool approved) external;
    function setBlockRange(uint256 _blockRange) external;
    function cancelTrades(Cancel[] memory cancels) external;
    function incrementNonce() external;
    /*//////////////////////////////////////////////////////////////
                          EXECUTION WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAsk(TakeAsk memory inputs, bytes calldata oracleSignature) external payable;
    function takeBid(TakeBid memory inputs, bytes calldata oracleSignature) external;
    function takeAskSingle(TakeAskSingle memory inputs, bytes calldata oracleSignature) external payable;
    function takeBidSingle(TakeBidSingle memory inputs, bytes calldata oracleSignature) external;
    /*//////////////////////////////////////////////////////////////
                        EXECUTION POOL WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAskSinglePool(
        TakeAskSingle memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
    function takeAskPool(
        TakeAsk memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
enum Side { Buy, Sell }
enum SignatureVersion { Single, Bulk }
enum AssetType { ERC721, ERC1155 }
struct Fee {
    uint16 rate;
    address payable recipient;
}
struct Order {
    address trader;
    Side side;
    address matchingPolicy;
    address collection;
    uint256 tokenId;
    uint256 amount;
    address paymentToken;
    uint256 price;
    uint256 listingTime;
    /* Order expiration timestamp - 0 for oracle cancellations. */
    uint256 expirationTime;
    Fee[] fees;
    uint256 salt;
    bytes extraParams;
}
struct Input {
    Order order;
    uint8 v;
    bytes32 r;
    bytes32 s;
    bytes extraSignature;
    SignatureVersion signatureVersion;
    uint256 blockNumber;
}
struct Execution {
  Input sell;
  Input buy;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
struct TakeAsk {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
    address tokenRecipient;
}
struct TakeAskSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
    address tokenRecipient;
}
struct TakeBid {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
}
struct TakeBidSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
}
enum AssetType {
    ERC721,
    ERC1155
}
enum OrderType {
    ASK,
    BID
}
struct Exchange { // Size: 0x80
    uint256 index; // 0x00
    bytes32[] proof; // 0x20
    Listing listing; // 0x40
    Taker taker; // 0x60
}
struct Listing { // Size: 0x80
    uint256 index; // 0x00
    uint256 tokenId; // 0x20
    uint256 amount; // 0x40
    uint256 price; // 0x60
}
struct Taker { // Size: 0x40
    uint256 tokenId; // 0x00
    uint256 amount; // 0x20
}
struct Order { // Size: 0x100
    address trader; // 0x00
    address collection; // 0x20
    bytes32 listingsRoot; // 0x40
    uint256 numberOfListings; // 0x60
    uint256 expirationTime; // 0x80
    AssetType assetType; // 0xa0
    FeeRate makerFee; // 0xc0
    uint256 salt; // 0xe0
}
/*
Reference only; struct is composed manually using calldata formatting in execution
struct ExecutionBatch { // Size: 0x80
    address taker; // 0x00
    OrderType orderType; // 0x20
    Transfer[] transfers; // 0x40
    uint256 length; // 0x60
}
*/
struct Transfer { // Size: 0xa0
    address trader; // 0x00
    uint256 id; // 0x20
    uint256 amount; // 0x40
    address collection; // 0x60
    AssetType assetType; // 0x80
}
struct FungibleTransfers {
    uint256 totalProtocolFee;
    uint256 totalSellerTransfer;
    uint256 totalTakerFee;
    uint256 feeRecipientId;
    uint256 makerId;
    address[] feeRecipients;
    address[] makers;
    uint256[] makerTransfers;
    uint256[] feeTransfers;
    AtomicExecution[] executions;
}
struct AtomicExecution { // Size: 0xe0
    uint256 makerId; // 0x00
    uint256 sellerAmount; // 0x20
    uint256 makerFeeRecipientId; // 0x40
    uint256 makerFeeAmount; // 0x60
    uint256 takerFeeAmount; // 0x80
    uint256 protocolFeeAmount; // 0xa0
    StateUpdate stateUpdate; // 0xc0
}
struct StateUpdate { // Size: 0xa0
    address trader; // 0x00
    bytes32 hash; // 0x20
    uint256 index; // 0x40
    uint256 value; // 0x60
    uint256 maxAmount; // 0x80
}
struct Fees { // Size: 0x40
    FeeRate protocolFee; // 0x00
    FeeRate takerFee; // 0x20
}
struct FeeRate { // Size: 0x40
    address recipient; // 0x00
    uint16 rate; // 0x20
}
struct Cancel {
    bytes32 hash;
    uint256 index;
    uint256 amount;
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern, minimalist, and gas efficient ERC-721 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 indexed id);
    event Approval(address indexed owner, address indexed spender, uint256 indexed id);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /*//////////////////////////////////////////////////////////////
                         METADATA STORAGE/LOGIC
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    function tokenURI(uint256 id) public view virtual returns (string memory);
    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) internal _ownerOf;
    mapping(address => uint256) internal _balanceOf;
    function ownerOf(uint256 id) public view virtual returns (address owner) {
        require((owner = _ownerOf[id]) != address(0), "NOT_MINTED");
    }
    function balanceOf(address owner) public view virtual returns (uint256) {
        require(owner != address(0), "ZERO_ADDRESS");
        return _balanceOf[owner];
    }
    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) public getApproved;
    mapping(address => mapping(address => bool)) public isApprovedForAll;
    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }
    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 id) public virtual {
        address owner = _ownerOf[id];
        require(msg.sender == owner || isApprovedForAll[owner][msg.sender], "NOT_AUTHORIZED");
        getApproved[id] = spender;
        emit Approval(owner, spender, id);
    }
    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }
    function transferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        require(from == _ownerOf[id], "WRONG_FROM");
        require(to != address(0), "INVALID_RECIPIENT");
        require(
            msg.sender == from || isApprovedForAll[from][msg.sender] || msg.sender == getApproved[id],
            "NOT_AUTHORIZED"
        );
        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        unchecked {
            _balanceOf[from]--;
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        delete getApproved[id];
        emit Transfer(from, to, id);
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes calldata data
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 id) internal virtual {
        require(to != address(0), "INVALID_RECIPIENT");
        require(_ownerOf[id] == address(0), "ALREADY_MINTED");
        // Counter overflow is incredibly unrealistic.
        unchecked {
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        emit Transfer(address(0), to, id);
    }
    function _burn(uint256 id) internal virtual {
        address owner = _ownerOf[id];
        require(owner != address(0), "NOT_MINTED");
        // Ownership check above ensures no underflow.
        unchecked {
            _balanceOf[owner]--;
        }
        delete _ownerOf[id];
        delete getApproved[id];
        emit Transfer(owner, address(0), id);
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL SAFE MINT LOGIC
    //////////////////////////////////////////////////////////////*/
    function _safeMint(address to, uint256 id) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function _safeMint(
        address to,
        uint256 id,
        bytes memory data
    ) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
}
/// @notice A generic interface for a contract which properly accepts ERC721 tokens.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721TokenReceiver {
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC721TokenReceiver.onERC721Received.selector;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)
pragma solidity ^0.8.0;
import "./OwnableUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    function __Ownable2Step_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }
    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    address private _pendingOwner;
    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }
    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }
    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
import "./Structs.sol";
import "./Errors.sol";
import "../interfaces/ISignatures.sol";
abstract contract Signatures is ISignatures {
    bytes32 private immutable _LOAN_OFFER_TYPEHASH;
    bytes32 private immutable _FEE_TYPEHASH;
    bytes32 private immutable _SELL_OFFER_TYPEHASH;
    bytes32 private immutable _ORACLE_OFFER_TYPEHASH;
    bytes32 private immutable _EIP_712_DOMAIN_TYPEHASH;
    string private constant _NAME = "Blend";
    string private constant _VERSION = "1.0";
    mapping(address => uint256) public nonces;
    mapping(address => uint256) public oracles;
    uint256 public blockRange;
    uint256[50] private _gap;
    constructor() {
        (
            _LOAN_OFFER_TYPEHASH,
            _SELL_OFFER_TYPEHASH,
            _FEE_TYPEHASH,
            _ORACLE_OFFER_TYPEHASH,
            _EIP_712_DOMAIN_TYPEHASH
        ) = _createTypehashes();
    }
    function information() external view returns (string memory version, bytes32 domainSeparator) {
        version = _VERSION;
        domainSeparator = _hashDomain(
            _EIP_712_DOMAIN_TYPEHASH,
            keccak256(bytes(_NAME)),
            keccak256(bytes(_VERSION))
        );
    }
    function getSellOfferHash(SellOffer calldata offer) external view returns (bytes32) {
        return _hashSellOffer(offer);
    }
    function getOfferHash(LoanOffer calldata offer) external view returns (bytes32) {
        return _hashOffer(offer);
    }
    function getOracleOfferHash(bytes32 hash, uint256 blockNumber) external view returns (bytes32) {
        return _hashOracleOffer(hash, blockNumber);
    }
    /**
     * @notice Generate all EIP712 Typehashes
     */
    function _createTypehashes()
        internal
        view
        returns (
            bytes32 loanOfferTypehash,
            bytes32 sellOfferTypehash,
            bytes32 feeTypehash,
            bytes32 oracleOfferTypehash,
            bytes32 eip712DomainTypehash
        )
    {
        eip712DomainTypehash = keccak256(
            bytes.concat(
                "EIP712Domain(",
                "string name,",
                "string version,",
                "uint256 chainId,",
                "address verifyingContract",
                ")"
            )
        );
        oracleOfferTypehash = keccak256(
            bytes.concat("OracleOffer(", "bytes32 hash,", "uint256 blockNumber", ")")
        );
        loanOfferTypehash = keccak256(
            bytes.concat(
                "LoanOffer(",
                "address lender,",
                "address collection,",
                "uint256 totalAmount,",
                "uint256 minAmount,",
                "uint256 maxAmount,",
                "uint256 auctionDuration,",
                "uint256 salt,",
                "uint256 expirationTime,",
                "uint256 rate,",
                "address oracle,",
                "uint256 nonce",
                ")"
            )
        );
        bytes memory feeTypestring = bytes.concat("Fee(", "uint16 rate,", "address recipient", ")");
        feeTypehash = keccak256(feeTypestring);
        sellOfferTypehash = keccak256(
            bytes.concat(
                "SellOffer(",
                "address borrower,",
                "uint256 lienId,",
                "uint256 price,",
                "uint256 expirationTime,",
                "uint256 salt,",
                "address oracle,",
                "Fee[] fees,",
                "uint256 nonce",
                ")",
                feeTypestring
            )
        );
    }
    function _hashDomain(
        bytes32 eip712DomainTypehash,
        bytes32 nameHash,
        bytes32 versionHash
    ) internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    eip712DomainTypehash,
                    nameHash,
                    versionHash,
                    block.chainid,
                    address(this)
                )
            );
    }
    function _hashFee(Fee calldata fee) internal view returns (bytes32) {
        return keccak256(abi.encode(_FEE_TYPEHASH, fee.rate, fee.recipient));
    }
    function _packFees(Fee[] calldata fees) internal view returns (bytes32) {
        bytes32[] memory feeHashes = new bytes32[](fees.length);
        uint256 feesLength = fees.length;
        for (uint256 i; i < feesLength; ) {
            feeHashes[i] = _hashFee(fees[i]);
            unchecked {
                ++i;
            }
        }
        return keccak256(abi.encodePacked(feeHashes));
    }
    function _hashSellOffer(SellOffer calldata offer) internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    _SELL_OFFER_TYPEHASH,
                    offer.borrower,
                    offer.lienId,
                    offer.price,
                    offer.expirationTime,
                    offer.salt,
                    offer.oracle,
                    _packFees(offer.fees),
                    nonces[offer.borrower]
                )
            );
    }
    function _hashOffer(LoanOffer calldata offer) internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    _LOAN_OFFER_TYPEHASH,
                    offer.lender,
                    offer.collection,
                    offer.totalAmount,
                    offer.minAmount,
                    offer.maxAmount,
                    offer.auctionDuration,
                    offer.salt,
                    offer.expirationTime,
                    offer.rate,
                    offer.oracle,
                    nonces[offer.lender]
                )
            );
    }
    function _hashOracleOffer(bytes32 hash, uint256 blockNumber) internal view returns (bytes32) {
        return keccak256(abi.encode(_ORACLE_OFFER_TYPEHASH, hash, blockNumber));
    }
    function _hashToSign(bytes32 hash) internal view returns (bytes32) {
        return keccak256(
            bytes.concat(
                bytes2(0x1901),
                _hashDomain(
                    _EIP_712_DOMAIN_TYPEHASH,
                    keccak256(bytes(_NAME)),
                    keccak256(bytes(_VERSION))
                ),
                hash
            )
        );
    }
    function _hashToSignOracle(bytes32 hash, uint256 blockNumber) internal view returns (bytes32) {
        return
            keccak256(
                bytes.concat(
                    bytes2(0x1901),
                    _hashDomain(
                        _EIP_712_DOMAIN_TYPEHASH,
                        keccak256(bytes(_NAME)),
                        keccak256(bytes(_VERSION))
                    ),
                    _hashOracleOffer(hash, blockNumber)
                )
            );
    }
    /**
     * @notice Verify authorization of offer
     * @param offerHash Hash of offer struct
     * @param lender Lender address
     * @param oracle Oracle address
     * @param signature Packed offer signature (with oracle signature if necessary)
     */
    function _verifyOfferAuthorization(
        bytes32 offerHash,
        address lender,
        address oracle,
        bytes calldata signature
    ) internal view {
        bytes32 hashToSign = _hashToSign(offerHash);
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            r := calldataload(signature.offset)
            s := calldataload(add(signature.offset, 0x20))
            v := shr(248, calldataload(add(signature.offset, 0x40)))
        }
        _verify(lender, hashToSign, v, r, s);
        /* Verify oracle signature if required. */
        if (oracle != address(0)) {
            uint256 blockNumber;
            assembly {
                r := calldataload(add(signature.offset, 0x41))
                s := calldataload(add(signature.offset, 0x61))
                v := shr(248, calldataload(add(signature.offset, 0x81)))
                blockNumber := calldataload(add(signature.offset, 0x82))
            }
            if (oracles[oracle] == 0) {
                revert UnauthorizedOracle();
            }
            if (blockNumber + blockRange < block.number) {
                revert SignatureExpired();
            }
            hashToSign = _hashToSignOracle(offerHash, blockNumber);
            _verify(oracle, hashToSign, v, r, s);
        }
    }
    /**
     * @notice Verify signature of digest
     * @param signer Address of expected signer
     * @param digest Signature digest
     * @param v v parameter
     * @param r r parameter
     * @param s s parameter
     */
    function _verify(address signer, bytes32 digest, uint8 v, bytes32 r, bytes32 s) internal pure {
        if (v != 27 && v != 28) {
            revert InvalidVParameter();
        }
        address recoveredSigner = ecrecover(digest, v, r, s);
        if (recoveredSigner == address(0) || signer != recoveredSigner) {
            revert InvalidSignature();
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./ISignatures.sol";
interface IOfferController is ISignatures {
    event OfferCancelled(address indexed user, uint256 salt);
    event NonceIncremented(address indexed user, uint256 newNonce);
    function cancelOffer(uint256 salt) external;
    function cancelOffers(uint256[] calldata salts) external;
    function incrementNonce() external;
    /* Admin */
    function setOracle(address oracle, bool approved) external;
    function setBlockRange(uint256 blockRange) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../lib/Structs.sol";
interface ISignatures {
    function information()
        external
        view
        returns (
            string memory version,
            bytes32 domainSeparator
        );
    function getOracleOfferHash(bytes32 hash, uint256 blockNumber) external view returns (bytes32);
    function getSellOfferHash(SellOffer calldata offer) external view returns (bytes32);
    function getOfferHash(LoanOffer calldata offer) external view returns (bytes32);
    function cancelledOrFulfilled(address user, uint256 salt) external view returns (uint256);
    function nonces(address user) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/UUPSUpgradeable.sol";
import "lib/openzeppelin-contracts-upgradeable/contracts/access/OwnableUpgradeable.sol";
import "./interfaces/IBlurPool.sol";
/**
 * @title BlurPool
 * @dev ETH pool; funds can only be transferred by Exchange, ExchangeV2, Swap or Blend
 */
contract BlurPool is IBlurPool, OwnableUpgradeable, UUPSUpgradeable {
    address private immutable EXCHANGE;
    address private immutable EXCHANGE_V2;
    address private immutable SWAP;
    address private immutable BLEND;
    mapping(address => uint256) private _balances;
    string public constant name = 'Blur Pool';
    string constant symbol = '';
    // required by the OZ UUPS module
    function _authorizeUpgrade(address) internal override onlyOwner {}
    constructor(address exchange, address exchangeV2, address swap, address blend) {
        _disableInitializers();
        EXCHANGE = exchange;
        EXCHANGE_V2 = exchangeV2;
        SWAP = swap;
        BLEND = blend;
    }
    /* Constructor (for ERC1967) */
    function initialize() external initializer {
        __Ownable_init();
    }
    function decimals() external pure returns (uint8) {
        return 18;
    }
    function totalSupply() external view returns (uint256) {
        return address(this).balance;
    }
    function balanceOf(address user) external view returns (uint256) {
        return _balances[user];
    }
    /**
     * @dev receive deposit function
     */
    receive() external payable {
        deposit();
    }
    /**
     * @dev deposit ETH into pool
     */
    function deposit() public payable {
        _balances[msg.sender] += msg.value;
        emit Transfer(address(0), msg.sender, msg.value);
    }
    /**
     * @dev deposit ETH into pool on behalf of user
     * @param user Address to deposit to
     */
    function deposit(address user) public payable {
        if (msg.sender != BLEND && msg.sender != EXCHANGE_V2) {
            revert('Unauthorized deposit');
        }
        _balances[user] += msg.value;
        emit Transfer(address(0), user, msg.value);
    }
    /**
     * @dev withdraw ETH from pool
     * @param amount Amount to withdraw
     */
    function withdraw(uint256 amount) external {
        uint256 balance = _balances[msg.sender];
        require(balance >= amount, "Insufficient funds");
        unchecked {
            _balances[msg.sender] = balance - amount;
        }
        (bool success,) = payable(msg.sender).call{value: amount}("");
        require(success, "Transfer failed");
        emit Transfer(msg.sender, address(0), amount);
    }
    /**
     * @dev withdraw ETH from pool on behalf of user; only callable by Blend
     * @param from Address to withdraw from
     * @param to Address to withdraw to
     * @param amount Amount to withdraw
     */
    function withdrawFrom(address from, address to, uint256 amount) external {
        if (msg.sender != BLEND && msg.sender != EXCHANGE_V2) {
            revert('Unauthorized transfer');
        }
        uint256 balance = _balances[from];
        require(balance >= amount, "Insufficient balance");
        unchecked {
            _balances[from] = balance - amount;
        }
        (bool success,) = payable(to).call{value: amount}("");
        require(success, "Transfer failed");
        emit Transfer(from, address(0), amount);
    }
    /**
     * @dev transferFrom Transfer balances within pool; only callable by Swap, Exchange, and Blend
     * @param from Pool fund sender
     * @param to Pool fund recipient
     * @param amount Amount to transfer
     */
    function transferFrom(address from, address to, uint256 amount)
        external
        returns (bool)
    {
        if (
            msg.sender != EXCHANGE &&
            msg.sender != EXCHANGE_V2 &&
            msg.sender != SWAP &&
            msg.sender != BLEND
        ) {
            revert('Unauthorized transfer');
        }
        _transfer(from, to, amount);
        return true;
    }
    function _transfer(address from, address to, uint256 amount) private {
        require(to != address(0), "Cannot transfer to 0 address");
        uint256 balance = _balances[from];
        require(balance >= amount, "Insufficient balance");
        unchecked {
            _balances[from] = balance - amount;
        }
        _balances[to] += amount;
        emit Transfer(from, to, amount);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/UUPSUpgradeable.sol)
pragma solidity ^0.8.0;
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";
/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }
    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);
    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }
    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }
    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }
    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IBlurPool {
    event Transfer(address indexed from, address indexed to, uint256 amount);
    function initialize() external;
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address user) external view returns (uint256);
    function deposit() external payable;
    function deposit(address user) external payable;
    function withdraw(uint256 amount) external;
    function withdrawFrom(address from, address to, uint256 amount) external;
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }
    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function _functionDelegateCall(address target, bytes memory data) private returns (bytes memory) {
        require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.2;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);
    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }
    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }
    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (interfaces/IERC1967.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.9._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
import "lib/solmate/src/utils/SignedWadMath.sol";
import { InvalidRepayment } from "./lib/Errors.sol";
import "./lib/Structs.sol";
import "../pool/interfaces/IBlurPool.sol";
import { IBlurExchangeV2 as IExchangeV2 } from "../exchangeV2/interfaces/IBlurExchangeV2.sol";
import { Order as OrderV1, SignatureVersion, Side } from "../exchangeV1/lib/OrderStructs.sol";
import {
    TakeAskSingle,
    TakeBidSingle,
    FeeRate,
    Taker,
    Exchange,
    Order as OrderV2,
    AssetType
} from "../exchangeV2/lib/Structs.sol";
interface IExchange {
    function execute(Input calldata sell, Input calldata buy) external payable;
}
library Helpers {
    int256 private constant _YEAR_WAD = 365 days * 1e18;
    uint256 private constant _LIQUIDATION_THRESHOLD = 100_000;
    uint256 private constant _BASIS_POINTS = 10_000;
    error InvalidExecution();
    /**
     * @dev Computes the current debt of a borrow given the last time it was touched and the last computed debt.
     * @param amount Principal in ETH
     * @param startTime Start time of the loan
     * @param rate Interest rate (in bips)
     * @dev Formula: https://www.desmos.com/calculator/l6omp0rwnh
     */
    function computeCurrentDebt(
        uint256 amount,
        uint256 rate,
        uint256 startTime
    ) public view returns (uint256) {
        uint256 loanTime = block.timestamp - startTime;
        int256 yearsWad = wadDiv(int256(loanTime) * 1e18, _YEAR_WAD);
        return uint256(wadMul(int256(amount), wadExp(wadMul(yearsWad, bipsToSignedWads(rate)))));
    }
    /**
     * @dev Calculates the current maximum interest rate a specific refinancing
     * auction could settle at currently given the auction's start block and duration.
     * @param startBlock The block the auction started at
     * @param oldRate Previous interest rate (in bips)
     * @dev Formula: https://www.desmos.com/calculator/urasr71dhb
     */
    function calcRefinancingAuctionRate(
        uint256 startBlock,
        uint256 auctionDuration,
        uint256 oldRate
    ) public view returns (uint256) {
        uint256 currentAuctionBlock = block.number - startBlock;
        int256 oldRateWads = bipsToSignedWads(oldRate);
        uint256 auctionT1 = auctionDuration / 5;
        uint256 auctionT2 = (4 * auctionDuration) / 5;
        int256 maxRateWads;
        {
            int256 aInverse = -bipsToSignedWads(15000);
            int256 b = 2;
            int256 maxMinRateWads = bipsToSignedWads(500);
            if (oldRateWads < -((b * aInverse) / 2)) {
                maxRateWads = maxMinRateWads + (oldRateWads ** 2) / aInverse + b * oldRateWads;
            } else {
                maxRateWads = maxMinRateWads - ((b ** 2) * aInverse) / 4;
            }
        }
        int256 startSlope = maxRateWads / int256(auctionT1); // wad-bips per block
        int256 middleSlope = bipsToSignedWads(9000) / int256((3 * auctionDuration) / 5) + 1; // wad-bips per block (add one to account for rounding)
        int256 middleB = maxRateWads - int256(auctionT1) * middleSlope;
        if (currentAuctionBlock < auctionT1) {
            return signedWadsToBips(startSlope * int256(currentAuctionBlock));
        } else if (currentAuctionBlock < auctionT2) {
            return signedWadsToBips(middleSlope * int256(currentAuctionBlock) + middleB);
        } else if (currentAuctionBlock < auctionDuration) {
            int256 endSlope;
            int256 endB;
            {
                endSlope =
                    (bipsToSignedWads(_LIQUIDATION_THRESHOLD) -
                        ((int256(auctionT2) * middleSlope) + middleB)) /
                    int256(auctionDuration - auctionT2); // wad-bips per block
                endB =
                    bipsToSignedWads(_LIQUIDATION_THRESHOLD) -
                    int256(auctionDuration) *
                    endSlope;
            }
            return signedWadsToBips(endSlope * int256(currentAuctionBlock) + endB);
        } else {
            return _LIQUIDATION_THRESHOLD;
        }
    }
    /**
     * @dev Converts an integer bips value to a signed wad value.
     */
    function bipsToSignedWads(uint256 bips) public pure returns (int256) {
        return int256((bips * 1e18) / _BASIS_POINTS);
    }
    /**
     * @dev Converts a signed wad value to an integer bips value.
     */
    function signedWadsToBips(int256 wads) public pure returns (uint256) {
        return uint256((wads * int256(_BASIS_POINTS)) / 1e18);
    }
    function executeTakeBid(
        Lien calldata lien,
        uint256 lienId,
        ExecutionV1 calldata execution,
        uint256 debt,
        IBlurPool pool,
        IExchange exchange,
        address delegate,
        address matchingPolicy
    ) external {
        /* Create sell side order from Blend. */
        OrderV1 memory sellOrder = OrderV1({
            trader: address(this),
            side: Side.Sell,
            matchingPolicy: matchingPolicy,
            collection: address(lien.collection),
            tokenId: lien.tokenId,
            amount: 1,
            paymentToken: address(pool),
            price: execution.makerOrder.order.price,
            listingTime: execution.makerOrder.order.listingTime + 1, // listingTime determines maker/taker
            expirationTime: type(uint256).max,
            fees: new Fee[](0),
            salt: lienId, // prevent reused order hash
            extraParams: "\\x01" // require oracle signature
        });
        Input memory sell = Input({
            order: sellOrder,
            v: 0,
            r: bytes32(0),
            s: bytes32(0),
            extraSignature: execution.extraSignature,
            signatureVersion: SignatureVersion.Single,
            blockNumber: execution.blockNumber
        });
        /* Execute marketplace order. */
        uint256 balanceBefore = pool.balanceOf(address(this));
        lien.collection.approve(delegate, lien.tokenId);
        exchange.execute(sell, execution.makerOrder);
        /* Determine the funds received from the sale (after fees). */
        uint256 amountReceivedFromSale = pool.balanceOf(address(this)) - balanceBefore;
        if (amountReceivedFromSale < debt) {
            revert InvalidRepayment();
        }
        /* Repay lender. */
        pool.transferFrom(address(this), lien.lender, debt);
        /* Send surplus to borrower. */
        unchecked {
            pool.transferFrom(address(this), lien.borrower, amountReceivedFromSale - debt);
        }
    }
    function executeTakeAskV2(
        LoanOffer calldata offer, 
        AskExecutionV2 calldata execution,
        uint256 loanAmount,
        uint256 collateralTokenId,
        uint256 price,
        IBlurPool pool,
        IExchangeV2 exchangeV2
    ) external {
        OrderV2 calldata order = execution.order;
        if (address(offer.collection) != order.collection || order.assetType != AssetType.ERC721) {
            revert InvalidExecution();
        }
        /* Transfer funds. */
        /* Need to retrieve the ETH to fund the marketplace execution. */
        if (loanAmount < price) {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), loanAmount);
            /* Supplement difference from borrower. */
            unchecked {
                pool.withdrawFrom(msg.sender, address(this), price - loanAmount);
            }
        } else {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), price);
            /* Send surplus to borrower. */
            unchecked {
                pool.transferFrom(offer.lender, msg.sender, loanAmount - price);
            }
        }
        TakeAskSingle memory execute = TakeAskSingle({
            order: execution.order,
            exchange: Exchange({
                index: 0,
                proof: execution.proof,
                listing: Listing({
                    index: execution.listing.index,
                    tokenId: collateralTokenId,
                    amount: 1,
                    price: price
                }),
                taker: Taker({ tokenId: collateralTokenId, amount: 1 })
            }),
            takerFee: FeeRate(address(0), 0),
            signature: execution.signature,
            tokenRecipient: address(this)
        });
        exchangeV2.takeAskSingle{ value: price }(execute, execution.oracleSignature);
    }
    function executeTakeAsk(
        LoanOffer calldata offer,
        ExecutionV1 calldata execution,
        uint256 loanAmount,
        uint256 collateralTokenId,
        uint256 price,
        IBlurPool pool,
        IExchange exchange,
        address matchingPolicy
    ) external {
        /* Transfer funds. */
        /* Need to retrieve the ETH to fund the marketplace execution. */
        if (loanAmount < price) {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), loanAmount);
            /* Supplement difference from borrower. */
            unchecked {
                pool.withdrawFrom(msg.sender, address(this), price - loanAmount);
            }
        } else {
            /* Take funds from lender. */
            pool.withdrawFrom(offer.lender, address(this), price);
            /* Send surplus to borrower. */
            unchecked {
                pool.transferFrom(offer.lender, msg.sender, loanAmount - price);
            }
        }
        OrderV1 memory buyOrder = OrderV1({
            trader: address(this),
            side: Side.Buy,
            matchingPolicy: matchingPolicy,
            collection: address(offer.collection),
            tokenId: collateralTokenId,
            amount: 1,
            paymentToken: address(0),
            price: price,
            listingTime: execution.makerOrder.order.listingTime + 1, // listingTime determines maker/taker
            expirationTime: type(uint256).max,
            fees: new Fee[](0),
            salt: uint160(execution.makerOrder.order.trader), // prevent reused order hash
            extraParams: "\\x01" // require oracle signature
        });
        Input memory buy = Input({
            order: buyOrder,
            v: 0,
            r: bytes32(0),
            s: bytes32(0),
            extraSignature: execution.extraSignature,
            signatureVersion: SignatureVersion.Single,
            blockNumber: execution.blockNumber
        });
        /* Execute order using ETH currently in contract. */
        exchange.execute{ value: price }(execution.makerOrder, buy);
    }
    function executeTakeBidV2(
        Lien calldata lien,
        BidExecutionV2 calldata execution,
        uint256 debt,
        IBlurPool pool,
        IExchangeV2 exchangeV2,
        address delegateV2
    ) external {
        OrderV2 calldata order = execution.order;
        if (address(lien.collection) != order.collection || order.assetType != AssetType.ERC721) {
            revert InvalidExecution();
        }
        uint256 balanceBefore = pool.balanceOf(address(this));
        TakeBidSingle memory execute = TakeBidSingle({
            order: execution.order,
            exchange: Exchange({
                index: 0,
                proof: execution.proof,
                listing: execution.listing,
                taker: Taker({ tokenId: lien.tokenId, amount: 1 })
            }),
            takerFee: FeeRate(address(0), 0),
            signature: execution.signature
        });
        /* Execute marketplace order. */
        lien.collection.approve(delegateV2, lien.tokenId);
        exchangeV2.takeBidSingle(execute, execution.oracleSignature);
        /* Determine the funds received from the sale (after fees). */
        uint256 amountReceivedFromSale = pool.balanceOf(address(this)) - balanceBefore;
        if (amountReceivedFromSale < debt) {
            revert InvalidRepayment();
        }
        /* Repay lender. */
        pool.transferFrom(address(this), lien.lender, debt);
        /* Send surplus to borrower. */
        unchecked {
            pool.transferFrom(address(this), lien.borrower, amountReceivedFromSale - debt);
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;
/// @notice Signed 18 decimal fixed point (wad) arithmetic library.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SignedWadMath.sol)
/// @author Modified from Remco Bloemen (https://xn--2-umb.com/22/exp-ln/index.html)
/// @dev Will not revert on overflow, only use where overflow is not possible.
function toWadUnsafe(uint256 x) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18.
        r := mul(x, 1000000000000000000)
    }
}
/// @dev Takes an integer amount of seconds and converts it to a wad amount of days.
/// @dev Will not revert on overflow, only use where overflow is not possible.
/// @dev Not meant for negative second amounts, it assumes x is positive.
function toDaysWadUnsafe(uint256 x) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18 and then divide it by 86400.
        r := div(mul(x, 1000000000000000000), 86400)
    }
}
/// @dev Takes a wad amount of days and converts it to an integer amount of seconds.
/// @dev Will not revert on overflow, only use where overflow is not possible.
/// @dev Not meant for negative day amounts, it assumes x is positive.
function fromDaysWadUnsafe(int256 x) pure returns (uint256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 86400 and then divide it by 1e18.
        r := div(mul(x, 86400), 1000000000000000000)
    }
}
/// @dev Will not revert on overflow, only use where overflow is not possible.
function unsafeWadMul(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by y and divide by 1e18.
        r := sdiv(mul(x, y), 1000000000000000000)
    }
}
/// @dev Will return 0 instead of reverting if y is zero and will
/// not revert on overflow, only use where overflow is not possible.
function unsafeWadDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Multiply x by 1e18 and divide it by y.
        r := sdiv(mul(x, 1000000000000000000), y)
    }
}
function wadMul(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Store x * y in r for now.
        r := mul(x, y)
        // Equivalent to require(x == 0 || (x * y) / x == y)
        if iszero(or(iszero(x), eq(sdiv(r, x), y))) {
            revert(0, 0)
        }
        // Scale the result down by 1e18.
        r := sdiv(r, 1000000000000000000)
    }
}
function wadDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Store x * 1e18 in r for now.
        r := mul(x, 1000000000000000000)
        // Equivalent to require(y != 0 && ((x * 1e18) / 1e18 == x))
        if iszero(and(iszero(iszero(y)), eq(sdiv(r, 1000000000000000000), x))) {
            revert(0, 0)
        }
        // Divide r by y.
        r := sdiv(r, y)
    }
}
/// @dev Will not work with negative bases, only use when x is positive.
function wadPow(int256 x, int256 y) pure returns (int256) {
    // Equivalent to x to the power of y because x ** y = (e ** ln(x)) ** y = e ** (ln(x) * y)
    return wadExp((wadLn(x) * y) / 1e18); // Using ln(x) means x must be greater than 0.
}
function wadExp(int256 x) pure returns (int256 r) {
    unchecked {
        // When the result is < 0.5 we return zero. This happens when
        // x <= floor(log(0.5e18) * 1e18) ~ -42e18
        if (x <= -42139678854452767551) return 0;
        // When the result is > (2**255 - 1) / 1e18 we can not represent it as an
        // int. This happens when x >= floor(log((2**255 - 1) / 1e18) * 1e18) ~ 135.
        if (x >= 135305999368893231589) revert("EXP_OVERFLOW");
        // x is now in the range (-42, 136) * 1e18. Convert to (-42, 136) * 2**96
        // for more intermediate precision and a binary basis. This base conversion
        // is a multiplication by 1e18 / 2**96 = 5**18 / 2**78.
        x = (x << 78) / 5**18;
        // Reduce range of x to (-½ ln 2, ½ ln 2) * 2**96 by factoring out powers
        // of two such that exp(x) = exp(x') * 2**k, where k is an integer.
        // Solving this gives k = round(x / log(2)) and x' = x - k * log(2).
        int256 k = ((x << 96) / 54916777467707473351141471128 + 2**95) >> 96;
        x = x - k * 54916777467707473351141471128;
        // k is in the range [-61, 195].
        // Evaluate using a (6, 7)-term rational approximation.
        // p is made monic, we'll multiply by a scale factor later.
        int256 y = x + 1346386616545796478920950773328;
        y = ((y * x) >> 96) + 57155421227552351082224309758442;
        int256 p = y + x - 94201549194550492254356042504812;
        p = ((p * y) >> 96) + 28719021644029726153956944680412240;
        p = p * x + (4385272521454847904659076985693276 << 96);
        // We leave p in 2**192 basis so we don't need to scale it back up for the division.
        int256 q = x - 2855989394907223263936484059900;
        q = ((q * x) >> 96) + 50020603652535783019961831881945;
        q = ((q * x) >> 96) - 533845033583426703283633433725380;
        q = ((q * x) >> 96) + 3604857256930695427073651918091429;
        q = ((q * x) >> 96) - 14423608567350463180887372962807573;
        q = ((q * x) >> 96) + 26449188498355588339934803723976023;
        /// @solidity memory-safe-assembly
        assembly {
            // Div in assembly because solidity adds a zero check despite the unchecked.
            // The q polynomial won't have zeros in the domain as all its roots are complex.
            // No scaling is necessary because p is already 2**96 too large.
            r := sdiv(p, q)
        }
        // r should be in the range (0.09, 0.25) * 2**96.
        // We now need to multiply r by:
        // * the scale factor s = ~6.031367120.
        // * the 2**k factor from the range reduction.
        // * the 1e18 / 2**96 factor for base conversion.
        // We do this all at once, with an intermediate result in 2**213
        // basis, so the final right shift is always by a positive amount.
        r = int256((uint256(r) * 3822833074963236453042738258902158003155416615667) >> uint256(195 - k));
    }
}
function wadLn(int256 x) pure returns (int256 r) {
    unchecked {
        require(x > 0, "UNDEFINED");
        // We want to convert x from 10**18 fixed point to 2**96 fixed point.
        // We do this by multiplying by 2**96 / 10**18. But since
        // ln(x * C) = ln(x) + ln(C), we can simply do nothing here
        // and add ln(2**96 / 10**18) at the end.
        /// @solidity memory-safe-assembly
        assembly {
            r := shl(7, lt(0xffffffffffffffffffffffffffffffff, x))
            r := or(r, shl(6, lt(0xffffffffffffffff, shr(r, x))))
            r := or(r, shl(5, lt(0xffffffff, shr(r, x))))
            r := or(r, shl(4, lt(0xffff, shr(r, x))))
            r := or(r, shl(3, lt(0xff, shr(r, x))))
            r := or(r, shl(2, lt(0xf, shr(r, x))))
            r := or(r, shl(1, lt(0x3, shr(r, x))))
            r := or(r, lt(0x1, shr(r, x)))
        }
        // Reduce range of x to (1, 2) * 2**96
        // ln(2^k * x) = k * ln(2) + ln(x)
        int256 k = r - 96;
        x <<= uint256(159 - k);
        x = int256(uint256(x) >> 159);
        // Evaluate using a (8, 8)-term rational approximation.
        // p is made monic, we will multiply by a scale factor later.
        int256 p = x + 3273285459638523848632254066296;
        p = ((p * x) >> 96) + 24828157081833163892658089445524;
        p = ((p * x) >> 96) + 43456485725739037958740375743393;
        p = ((p * x) >> 96) - 11111509109440967052023855526967;
        p = ((p * x) >> 96) - 45023709667254063763336534515857;
        p = ((p * x) >> 96) - 14706773417378608786704636184526;
        p = p * x - (795164235651350426258249787498 << 96);
        // We leave p in 2**192 basis so we don't need to scale it back up for the division.
        // q is monic by convention.
        int256 q = x + 5573035233440673466300451813936;
        q = ((q * x) >> 96) + 71694874799317883764090561454958;
        q = ((q * x) >> 96) + 283447036172924575727196451306956;
        q = ((q * x) >> 96) + 401686690394027663651624208769553;
        q = ((q * x) >> 96) + 204048457590392012362485061816622;
        q = ((q * x) >> 96) + 31853899698501571402653359427138;
        q = ((q * x) >> 96) + 909429971244387300277376558375;
        /// @solidity memory-safe-assembly
        assembly {
            // Div in assembly because solidity adds a zero check despite the unchecked.
            // The q polynomial is known not to have zeros in the domain.
            // No scaling required because p is already 2**96 too large.
            r := sdiv(p, q)
        }
        // r is in the range (0, 0.125) * 2**96
        // Finalization, we need to:
        // * multiply by the scale factor s = 5.549…
        // * add ln(2**96 / 10**18)
        // * add k * ln(2)
        // * multiply by 10**18 / 2**96 = 5**18 >> 78
        // mul s * 5e18 * 2**96, base is now 5**18 * 2**192
        r *= 1677202110996718588342820967067443963516166;
        // add ln(2) * k * 5e18 * 2**192
        r += 16597577552685614221487285958193947469193820559219878177908093499208371 * k;
        // add ln(2**96 / 10**18) * 5e18 * 2**192
        r += 600920179829731861736702779321621459595472258049074101567377883020018308;
        // base conversion: mul 2**18 / 2**192
        r >>= 174;
    }
}
/// @dev Will return 0 instead of reverting if y is zero.
function unsafeDiv(int256 x, int256 y) pure returns (int256 r) {
    /// @solidity memory-safe-assembly
    assembly {
        // Divide x by y.
        r := sdiv(x, y)
    }
}
// SPDX-License-Identifier: BSL 1.1 - Blend (c) Non Fungible Trading Ltd.
pragma solidity 0.8.17;
// Blend
error Unauthorized();
error InvalidLoan();
error InvalidLien();
error InsufficientOffer();
error InvalidRepayment();
error LienIsDefaulted();
error LienNotDefaulted();
error AuctionIsActive();
error AuctionIsNotActive();
error InvalidRefinance();
error RateTooHigh();
error FeesTooHigh();
error CollectionsDoNotMatch();
error InvalidAuctionDuration();
// OfferController
error OfferExpired();
error OfferUnavailable();
// Signatures
error UnauthorizedOracle();
error SignatureExpired();
error InvalidSignature();
error InvalidVParameter();
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "lib/solmate/src/tokens/ERC721.sol";
import { Input, Fee } from "../../exchangeV1/lib/OrderStructs.sol";
import { Order as OrderV2, Listing } from "../../exchangeV2/lib/Structs.sol";
struct LienPointer {
    Lien lien;
    uint256 lienId;
}
struct SellOffer {
    address borrower;
    uint256 lienId;
    uint256 price;
    uint256 expirationTime;
    uint256 salt;
    address oracle;
    Fee[] fees;
}
struct Lien {
    address lender;
    address borrower;
    ERC721 collection;
    uint256 tokenId;
    uint256 amount;
    uint256 startTime;
    uint256 rate;
    uint256 auctionStartBlock;
    uint256 auctionDuration;
}
struct LoanOffer {
    address lender;
    ERC721 collection;
    uint256 totalAmount;
    uint256 minAmount;
    uint256 maxAmount;
    uint256 auctionDuration;
    uint256 salt;
    uint256 expirationTime;
    uint256 rate;
    address oracle;
}
struct LoanInput {
    LoanOffer offer;
    bytes signature;
}
struct SellInput {
    SellOffer offer;
    bytes signature;
}
struct ExecutionV1 {
    Input makerOrder;
    bytes extraSignature;
    uint256 blockNumber;
}
struct BidExecutionV2 {
    OrderV2 order;
    Listing listing;
    bytes32[] proof;
    bytes signature;
    bytes oracleSignature;
}
struct AskExecutionV2 {
    OrderV2 order;
    Listing listing;
    bytes32[] proof;
    bytes signature;
    bytes oracleSignature;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IBlurPool {
    event Transfer(address indexed from, address indexed to, uint256 amount);
    function initialize() external;
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address user) external view returns (uint256);
    function deposit() external payable;
    function deposit(address user) external payable;
    function withdraw(uint256 amount) external;
    function withdrawFrom(address from, address to, uint256 amount) external;
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    Order,
    Exchange,
    Fees,
    FeeRate,
    AssetType,
    OrderType,
    Transfer,
    FungibleTransfers,
    StateUpdate,
    Cancel,
    Listing
} from "../lib/Structs.sol";
interface IBlurExchangeV2 {
    error InsufficientFunds();
    error TokenTransferFailed();
    error InvalidOrder();
    error ProtocolFeeTooHigh();
    event NewProtocolFee(address indexed recipient, uint16 indexed rate);
    event NewGovernor(address indexed governor);
    event NewBlockRange(uint256 blockRange);
    event CancelTrade(address indexed user, bytes32 hash, uint256 index, uint256 amount);
    event NonceIncremented(address indexed user, uint256 newNonce);
    event SetOracle(address indexed user, bool approved);
    function initialize() external;
    function setProtocolFee(address recipient, uint16 rate) external;
    function setGovernor(address _governor) external;
    function setOracle(address oracle, bool approved) external;
    function setBlockRange(uint256 _blockRange) external;
    function cancelTrades(Cancel[] memory cancels) external;
    function incrementNonce() external;
    /*//////////////////////////////////////////////////////////////
                          EXECUTION WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAsk(TakeAsk memory inputs, bytes calldata oracleSignature) external payable;
    function takeBid(TakeBid memory inputs, bytes calldata oracleSignature) external;
    function takeAskSingle(TakeAskSingle memory inputs, bytes calldata oracleSignature) external payable;
    function takeBidSingle(TakeBidSingle memory inputs, bytes calldata oracleSignature) external;
    /*//////////////////////////////////////////////////////////////
                        EXECUTION POOL WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAskSinglePool(
        TakeAskSingle memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
    function takeAskPool(
        TakeAsk memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
enum Side { Buy, Sell }
enum SignatureVersion { Single, Bulk }
enum AssetType { ERC721, ERC1155 }
struct Fee {
    uint16 rate;
    address payable recipient;
}
struct Order {
    address trader;
    Side side;
    address matchingPolicy;
    address collection;
    uint256 tokenId;
    uint256 amount;
    address paymentToken;
    uint256 price;
    uint256 listingTime;
    /* Order expiration timestamp - 0 for oracle cancellations. */
    uint256 expirationTime;
    Fee[] fees;
    uint256 salt;
    bytes extraParams;
}
struct Input {
    Order order;
    uint8 v;
    bytes32 r;
    bytes32 s;
    bytes extraSignature;
    SignatureVersion signatureVersion;
    uint256 blockNumber;
}
struct Execution {
  Input sell;
  Input buy;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
struct TakeAsk {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
    address tokenRecipient;
}
struct TakeAskSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
    address tokenRecipient;
}
struct TakeBid {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
}
struct TakeBidSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
}
enum AssetType {
    ERC721,
    ERC1155
}
enum OrderType {
    ASK,
    BID
}
struct Exchange { // Size: 0x80
    uint256 index; // 0x00
    bytes32[] proof; // 0x20
    Listing listing; // 0x40
    Taker taker; // 0x60
}
struct Listing { // Size: 0x80
    uint256 index; // 0x00
    uint256 tokenId; // 0x20
    uint256 amount; // 0x40
    uint256 price; // 0x60
}
struct Taker { // Size: 0x40
    uint256 tokenId; // 0x00
    uint256 amount; // 0x20
}
struct Order { // Size: 0x100
    address trader; // 0x00
    address collection; // 0x20
    bytes32 listingsRoot; // 0x40
    uint256 numberOfListings; // 0x60
    uint256 expirationTime; // 0x80
    AssetType assetType; // 0xa0
    FeeRate makerFee; // 0xc0
    uint256 salt; // 0xe0
}
/*
Reference only; struct is composed manually using calldata formatting in execution
struct ExecutionBatch { // Size: 0x80
    address taker; // 0x00
    OrderType orderType; // 0x20
    Transfer[] transfers; // 0x40
    uint256 length; // 0x60
}
*/
struct Transfer { // Size: 0xa0
    address trader; // 0x00
    uint256 id; // 0x20
    uint256 amount; // 0x40
    address collection; // 0x60
    AssetType assetType; // 0x80
}
struct FungibleTransfers {
    uint256 totalProtocolFee;
    uint256 totalSellerTransfer;
    uint256 totalTakerFee;
    uint256 feeRecipientId;
    uint256 makerId;
    address[] feeRecipients;
    address[] makers;
    uint256[] makerTransfers;
    uint256[] feeTransfers;
    AtomicExecution[] executions;
}
struct AtomicExecution { // Size: 0xe0
    uint256 makerId; // 0x00
    uint256 sellerAmount; // 0x20
    uint256 makerFeeRecipientId; // 0x40
    uint256 makerFeeAmount; // 0x60
    uint256 takerFeeAmount; // 0x80
    uint256 protocolFeeAmount; // 0xa0
    StateUpdate stateUpdate; // 0xc0
}
struct StateUpdate { // Size: 0xa0
    address trader; // 0x00
    bytes32 hash; // 0x20
    uint256 index; // 0x40
    uint256 value; // 0x60
    uint256 maxAmount; // 0x80
}
struct Fees { // Size: 0x40
    FeeRate protocolFee; // 0x00
    FeeRate takerFee; // 0x20
}
struct FeeRate { // Size: 0x40
    address recipient; // 0x00
    uint16 rate; // 0x20
}
struct Cancel {
    bytes32 hash;
    uint256 index;
    uint256 amount;
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern, minimalist, and gas efficient ERC-721 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 indexed id);
    event Approval(address indexed owner, address indexed spender, uint256 indexed id);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /*//////////////////////////////////////////////////////////////
                         METADATA STORAGE/LOGIC
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    function tokenURI(uint256 id) public view virtual returns (string memory);
    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) internal _ownerOf;
    mapping(address => uint256) internal _balanceOf;
    function ownerOf(uint256 id) public view virtual returns (address owner) {
        require((owner = _ownerOf[id]) != address(0), "NOT_MINTED");
    }
    function balanceOf(address owner) public view virtual returns (uint256) {
        require(owner != address(0), "ZERO_ADDRESS");
        return _balanceOf[owner];
    }
    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) public getApproved;
    mapping(address => mapping(address => bool)) public isApprovedForAll;
    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }
    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 id) public virtual {
        address owner = _ownerOf[id];
        require(msg.sender == owner || isApprovedForAll[owner][msg.sender], "NOT_AUTHORIZED");
        getApproved[id] = spender;
        emit Approval(owner, spender, id);
    }
    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }
    function transferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        require(from == _ownerOf[id], "WRONG_FROM");
        require(to != address(0), "INVALID_RECIPIENT");
        require(
            msg.sender == from || isApprovedForAll[from][msg.sender] || msg.sender == getApproved[id],
            "NOT_AUTHORIZED"
        );
        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        unchecked {
            _balanceOf[from]--;
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        delete getApproved[id];
        emit Transfer(from, to, id);
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes calldata data
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 id) internal virtual {
        require(to != address(0), "INVALID_RECIPIENT");
        require(_ownerOf[id] == address(0), "ALREADY_MINTED");
        // Counter overflow is incredibly unrealistic.
        unchecked {
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        emit Transfer(address(0), to, id);
    }
    function _burn(uint256 id) internal virtual {
        address owner = _ownerOf[id];
        require(owner != address(0), "NOT_MINTED");
        // Ownership check above ensures no underflow.
        unchecked {
            _balanceOf[owner]--;
        }
        delete _ownerOf[id];
        delete getApproved[id];
        emit Transfer(owner, address(0), id);
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL SAFE MINT LOGIC
    //////////////////////////////////////////////////////////////*/
    function _safeMint(address to, uint256 id) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function _safeMint(
        address to,
        uint256 id,
        bytes memory data
    ) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
}
/// @notice A generic interface for a contract which properly accepts ERC721 tokens.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721TokenReceiver {
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC721TokenReceiver.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { Ownable2StepUpgradeable } from "lib/openzeppelin-contracts-upgradeable/contracts/access/Ownable2StepUpgradeable.sol";
import { UUPSUpgradeable } from "lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/UUPSUpgradeable.sol";
import { Executor } from "./Executor.sol";
import "./lib/Constants.sol";
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    Order,
    Exchange,
    Fees,
    FeeRate,
    AssetType,
    OrderType,
    Transfer,
    FungibleTransfers,
    StateUpdate,
    AtomicExecution,
    Cancel,
    Listing
} from "./lib/Structs.sol";
import { IBlurExchangeV2 } from "./interfaces/IBlurExchangeV2.sol";
import { ReentrancyGuardUpgradeable } from "./lib/ReentrancyGuardUpgradeable.sol";
contract BlurExchangeV2 is
    IBlurExchangeV2,
    Ownable2StepUpgradeable,
    UUPSUpgradeable,
    ReentrancyGuardUpgradeable,
    Executor
{
    address public governor;
    // required by the OZ UUPS module
    function _authorizeUpgrade(address) internal override onlyOwner {}
    constructor(address delegate, address pool, address proxy) Executor(delegate, pool, proxy) {
        _disableInitializers();
    }
    function initialize() external initializer {
        __UUPSUpgradeable_init();
        __Ownable_init();
        __Reentrancy_init();
        verifyDomain();
    }
    modifier onlyGovernor() {
        if (msg.sender != governor) {
            revert Unauthorized();
        }
        _;
    }
    /**
     * @notice Governor only function to set the protocol fee rate and recipient
     * @param recipient Protocol fee recipient
     * @param rate Protocol fee rate
     */
    function setProtocolFee(address recipient, uint16 rate) external onlyGovernor {
        if (rate > _MAX_PROTOCOL_FEE_RATE) {
            revert ProtocolFeeTooHigh();
        }
        protocolFee = FeeRate(recipient, rate);
        emit NewProtocolFee(recipient, rate);
    }
    /**
     * @notice Admin only function to set the governor of the exchange
     * @param _governor Address of governor to set
     */
    function setGovernor(address _governor) external onlyOwner {
        governor = _governor;
        emit NewGovernor(_governor);
    }
    /**
     * @notice Admin only function to grant or revoke the approval of an oracle
     * @param oracle Address to set approval of
     * @param approved If the oracle should be approved or not
     */
    function setOracle(address oracle, bool approved) external onlyOwner {
        if (approved) {
            oracles[oracle] = 1;
        } else {
            oracles[oracle] = 0;
        }
        emit SetOracle(oracle, approved);
    }
    /**
     * @notice Admin only function to set the block range
     * @param _blockRange Block range that oracle signatures are valid for
     */
    function setBlockRange(uint256 _blockRange) external onlyOwner {
        blockRange = _blockRange;
        emit NewBlockRange(_blockRange);
    }
    /**
     * @notice Cancel listings by recording their fulfillment
     * @param cancels List of cancels to execute
     */
    function cancelTrades(Cancel[] memory cancels) external {
        uint256 cancelsLength = cancels.length;
        for (uint256 i; i < cancelsLength; ) {
            Cancel memory cancel = cancels[i];
            amountTaken[msg.sender][cancel.hash][cancel.index] += cancel.amount;
            emit CancelTrade(msg.sender, cancel.hash, cancel.index, cancel.amount);
            unchecked {
                ++i;
            }
        }
    }
    /**
     * @notice Cancels all orders by incrementing caller nonce
     */
    function incrementNonce() external {
        emit NonceIncremented(msg.sender, ++nonces[msg.sender]);
    }
    /*//////////////////////////////////////////////////////////////
                          EXECUTION WRAPPERS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Wrapper of _takeAsk that verifies an oracle signature of the calldata before executing
     * @param inputs Inputs for _takeAsk
     * @param oracleSignature Oracle signature of inputs
     */
    function takeAsk(
        TakeAsk memory inputs,
        bytes calldata oracleSignature
    )
        public
        payable
        nonReentrant
        verifyOracleSignature(_hashCalldata(msg.sender), oracleSignature)
    {
        _takeAsk(
            inputs.orders,
            inputs.exchanges,
            inputs.takerFee,
            inputs.signatures,
            inputs.tokenRecipient
        );
    }
    /**
     * @notice Wrapper of _takeBid that verifies an oracle signature of the calldata before executing
     * @param inputs Inputs for _takeBid
     * @param oracleSignature Oracle signature of inputs
     */
    function takeBid(
        TakeBid memory inputs,
        bytes calldata oracleSignature
    ) public verifyOracleSignature(_hashCalldata(msg.sender), oracleSignature) {
        _takeBid(inputs.orders, inputs.exchanges, inputs.takerFee, inputs.signatures);
    }
    /**
     * @notice Wrapper of _takeAskSingle that verifies an oracle signature of the calldata before executing
     * @param inputs Inputs for _takeAskSingle
     * @param oracleSignature Oracle signature of inputs
     */
    function takeAskSingle(
        TakeAskSingle memory inputs,
        bytes calldata oracleSignature
    )
        public
        payable
        nonReentrant
        verifyOracleSignature(_hashCalldata(msg.sender), oracleSignature)
    {
        _takeAskSingle(
            inputs.order,
            inputs.exchange,
            inputs.takerFee,
            inputs.signature,
            inputs.tokenRecipient
        );
    }
    /**
     * @notice Wrapper of _takeBidSingle that verifies an oracle signature of the calldata before executing
     * @param inputs Inputs for _takeBidSingle
     * @param oracleSignature Oracle signature of inputs
     */
    function takeBidSingle(
        TakeBidSingle memory inputs,
        bytes calldata oracleSignature
    ) external verifyOracleSignature(_hashCalldata(msg.sender), oracleSignature) {
        _takeBidSingle(inputs.order, inputs.exchange, inputs.takerFee, inputs.signature);
    }
    /*//////////////////////////////////////////////////////////////
                        EXECUTION POOL WRAPPERS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Wrapper of takeAskSingle that withdraws ETH from the caller's pool balance prior to executing
     * @param inputs Inputs for takeAskSingle
     * @param oracleSignature Oracle signature of inputs
     * @param amountToWithdraw Amount of ETH to withdraw from the pool
     */
    function takeAskSinglePool(
        TakeAskSingle memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable {
        _withdrawFromPool(msg.sender, amountToWithdraw);
        takeAskSingle(inputs, oracleSignature);
    }
    /**
     * @notice Wrapper of takeAsk that withdraws ETH from the caller's pool balance prior to executing
     * @param inputs Inputs for takeAsk
     * @param oracleSignature Oracle signature of inputs
     * @param amountToWithdraw Amount of ETH to withdraw from the pool
     */
    function takeAskPool(
        TakeAsk memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable {
        _withdrawFromPool(msg.sender, amountToWithdraw);
        takeAsk(inputs, oracleSignature);
    }
    /*//////////////////////////////////////////////////////////////
                          EXECUTION FUNCTIONS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Take a single ask
     * @param order Order of listing to fulfill
     * @param exchange Exchange struct indicating the listing to take and the parameters to match it with
     * @param takerFee Taker fee to be taken
     * @param signature Order signature
     * @param tokenRecipient Address to receive the token transfer
     */
    function _takeAskSingle(
        Order memory order,
        Exchange memory exchange,
        FeeRate memory takerFee,
        bytes memory signature,
        address tokenRecipient
    ) internal {
        Fees memory fees = Fees(protocolFee, takerFee);
        Listing memory listing = exchange.listing;
        uint256 takerAmount = exchange.taker.amount;
        /* Validate the order and listing, revert if not. */
        if (!_validateOrderAndListing(order, OrderType.ASK, exchange, signature, fees)) {
            revert InvalidOrder();
        }
        /* Create single execution batch and insert the transfer. */
        bytes memory executionBatch = _initializeSingleExecution(
            order,
            OrderType.ASK,
            listing.tokenId,
            takerAmount,
            tokenRecipient
        );
        /* Set the fulfillment of the order. */
        unchecked {
            amountTaken[order.trader][bytes32(order.salt)][listing.index] += takerAmount;
        }
        /* Execute the token transfers, revert if not successful. */
        {
            bool[] memory successfulTransfers = _executeNonfungibleTransfers(executionBatch, 1);
            if (!successfulTransfers[0]) {
                revert TokenTransferFailed();
            }
        }
        (
            uint256 totalPrice,
            uint256 protocolFeeAmount,
            uint256 makerFeeAmount,
            uint256 takerFeeAmount
        ) = _computeFees(listing.price, takerAmount, order.makerFee, fees);
        /* If there are insufficient funds to cover the price with the fees, revert. */
        unchecked {
            if (address(this).balance < totalPrice + takerFeeAmount) {
                revert InsufficientFunds();
            }
        }
        /* Execute ETH transfers. */
        _transferETH(fees.protocolFee.recipient, protocolFeeAmount);
        _transferETH(fees.takerFee.recipient, takerFeeAmount);
        _transferETH(order.makerFee.recipient, makerFeeAmount);
        unchecked {
            _transferETH(order.trader, totalPrice - makerFeeAmount - protocolFeeAmount);
        }
        _emitExecutionEvent(executionBatch, order, listing.index, totalPrice, fees, OrderType.ASK);
        /* Return dust. */
        _transferETH(msg.sender, address(this).balance);
    }
    /**
     * @notice Take a single bid
     * @param order Order of listing to fulfill
     * @param exchange Exchange struct indicating the listing to take and the parameters to match it with
     * @param takerFee Taker fee to be taken
     * @param signature Order signature
     */
    function _takeBidSingle(
        Order memory order,
        Exchange memory exchange,
        FeeRate memory takerFee,
        bytes memory signature
    ) internal {
        Fees memory fees = Fees(protocolFee, takerFee);
        Listing memory listing = exchange.listing;
        uint256 takerAmount = exchange.taker.amount;
        /* Validate the order and listing, revert if not. */
        if (!_validateOrderAndListing(order, OrderType.BID, exchange, signature, fees)) {
            revert InvalidOrder();
        }
        /* Create single execution batch and insert the transfer. */
        bytes memory executionBatch = _initializeSingleExecution(
            order,
            OrderType.BID,
            exchange.taker.tokenId,
            takerAmount,
            msg.sender
        );
        /* Execute the token transfers, revert if not successful. */
        {
            bool[] memory successfulTransfers = _executeNonfungibleTransfers(executionBatch, 1);
            if (!successfulTransfers[0]) {
                revert TokenTransferFailed();
            }
        }
        (
            uint256 totalPrice,
            uint256 protocolFeeAmount,
            uint256 makerFeeAmount,
            uint256 takerFeeAmount
        ) = _computeFees(listing.price, takerAmount, order.makerFee, fees);
        /* Execute pool transfers and set the fulfillment of the order. */
        address trader = order.trader;
        _transferPool(trader, order.makerFee.recipient, makerFeeAmount);
        _transferPool(trader, fees.takerFee.recipient, takerFeeAmount);
        _transferPool(trader, fees.protocolFee.recipient, protocolFeeAmount);
        unchecked {
            _transferPool(trader, msg.sender, totalPrice - takerFeeAmount - protocolFeeAmount);
            amountTaken[trader][bytes32(order.salt)][listing.index] += exchange.taker.amount;
        }
        _emitExecutionEvent(executionBatch, order, listing.index, totalPrice, fees, OrderType.BID);
    }
    /**
     * @notice Take multiple asks; efficiently verifying and executing the transfers in bulk
     * @param orders List of orders
     * @param exchanges List of exchanges indicating the listing to take and the parameters to match it with
     * @param takerFee Taker fee to be taken on each exchange
     * @param signatures Bytes array of order signatures
     * @param tokenRecipient Address to receive the tokens purchased
     */
    function _takeAsk(
        Order[] memory orders,
        Exchange[] memory exchanges,
        FeeRate memory takerFee,
        bytes memory signatures,
        address tokenRecipient
    ) internal {
        Fees memory fees = Fees(protocolFee, takerFee);
        /**
         * Validate all the orders potentially used in the execution and
         * initialize the arrays for pending fulfillments.
         */
        (bool[] memory validOrders, uint256[][] memory pendingAmountTaken) = _validateOrders(
            orders,
            OrderType.ASK,
            signatures,
            fees
        );
        uint256 exchangesLength = exchanges.length;
        /* Initialize the execution batch structs. */
        (
            bytes memory executionBatch,
            FungibleTransfers memory fungibleTransfers
        ) = _initializeBatch(exchangesLength, OrderType.ASK, tokenRecipient);
        Order memory order;
        Exchange memory exchange;
        uint256 remainingETH = address(this).balance;
        for (uint256 i; i < exchangesLength; ) {
            exchange = exchanges[i];
            order = orders[exchange.index];
            /* Check the listing and exchange is valid and its parent order has already been validated. */
            if (
                _validateListingFromBatch(
                    order,
                    OrderType.ASK,
                    exchange,
                    validOrders,
                    pendingAmountTaken
                )
            ) {
                /* Insert the transfers into the batch. */
                bool inserted;
                (remainingETH, inserted) = _insertExecutionAsk(
                    executionBatch,
                    fungibleTransfers,
                    order,
                    exchange,
                    fees,
                    remainingETH
                );
                if (inserted) {
                    unchecked {
                        pendingAmountTaken[exchange.index][exchange.listing.index] += exchange
                            .taker
                            .amount;
                    }
                }
            }
            unchecked {
                ++i;
            }
        }
        /* Execute all transfers. */
        _executeBatchTransfer(executionBatch, fungibleTransfers, fees, OrderType.ASK);
        /* Return dust. */
        _transferETH(msg.sender, address(this).balance);
    }
    /**
     * @notice Take multiple bids; efficiently verifying and executing the transfers in bulk
     * @param orders List of orders
     * @param exchanges List of exchanges indicating the listing to take and the parameters to match it with
     * @param takerFee Taker fee to be taken on each exchange
     * @param signatures Bytes array of order signatures
     */
    function _takeBid(
        Order[] memory orders,
        Exchange[] memory exchanges,
        FeeRate memory takerFee,
        bytes memory signatures
    ) internal {
        Fees memory fees = Fees(protocolFee, takerFee);
        /**
         * Validate all the orders potentially used in the execution and
         * initialize the arrays for pending fulfillments.
         */
        (bool[] memory validOrders, uint256[][] memory pendingAmountTaken) = _validateOrders(
            orders,
            OrderType.BID,
            signatures,
            fees
        );
        uint256 exchangesLength = exchanges.length;
        /* Initialize the execution batch structs. */
        (
            bytes memory executionBatch,
            FungibleTransfers memory fungibleTransfers
        ) = _initializeBatch(exchangesLength, OrderType.BID, msg.sender);
        Order memory order;
        Exchange memory exchange;
        for (uint256 i; i < exchangesLength; ) {
            exchange = exchanges[i];
            order = orders[exchange.index];
            /* Check the listing and exchange is valid and its parent order has already been validated. */
            if (
                _validateListingFromBatch(
                    order,
                    OrderType.BID,
                    exchange,
                    validOrders,
                    pendingAmountTaken
                )
            ) {
                /* Insert the transfers into the batch. */
                _insertExecutionBid(executionBatch, fungibleTransfers, order, exchange, fees);
                /* Record the pending fulfillment. */
                unchecked {
                    pendingAmountTaken[exchange.index][exchange.listing.index] += exchange
                        .taker
                        .amount;
                }
            }
            unchecked {
                ++i;
            }
        }
        /* Execute all transfers. */
        _executeBatchTransfer(executionBatch, fungibleTransfers, fees, OrderType.BID);
    }
    /*//////////////////////////////////////////////////////////////
                          EXECUTION HELPERS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Initialize the ExecutionBatch and FungibleTransfers objects for bulk execution
     * @param exchangesLength Number of exchanges
     * @param orderType Order type
     * @param taker Order taker address
     */
    function _initializeBatch(
        uint256 exchangesLength,
        OrderType orderType,
        address taker
    )
        internal
        pure
        returns (bytes memory executionBatch, FungibleTransfers memory fungibleTransfers)
    {
        /* Initialize the batch. Constructing it manually in calldata packing allows for cheaper delegate execution. */
        uint256 arrayLength = Transfer_size * exchangesLength + One_word;
        uint256 executionBatchLength = ExecutionBatch_base_size + arrayLength;
        executionBatch = new bytes(executionBatchLength);
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            mstore(add(calldataPointer, ExecutionBatch_taker_offset), taker)
            mstore(add(calldataPointer, ExecutionBatch_orderType_offset), orderType)
            mstore(add(calldataPointer, ExecutionBatch_transfers_pointer_offset), ExecutionBatch_transfers_offset) // set the transfers pointer
            mstore(add(calldataPointer, ExecutionBatch_transfers_offset), exchangesLength) // set the length of the transfers array
        }
        /* Initialize the fungible transfers object. */
        AtomicExecution[] memory executions = new AtomicExecution[](exchangesLength);
        address[] memory feeRecipients = new address[](exchangesLength);
        address[] memory makers = new address[](exchangesLength);
        uint256[] memory makerTransfers = new uint256[](exchangesLength);
        uint256[] memory feeTransfers = new uint256[](exchangesLength);
        fungibleTransfers = FungibleTransfers({
            totalProtocolFee: 0,
            totalSellerTransfer: 0,
            totalTakerFee: 0,
            feeRecipientId: 0,
            feeRecipients: feeRecipients,
            makerId: 0,
            makers: makers,
            feeTransfers: feeTransfers,
            makerTransfers: makerTransfers,
            executions: executions
        });
    }
    /**
     * @notice Initialize the ExecutionBatch object for a single execution
     * @param order Order to take a Listing from
     * @param orderType Order type
     * @param tokenId Token id
     * @param amount ERC721/ERC1155 amount
     * @param taker Order taker address
     */
    function _initializeSingleExecution(
        Order memory order,
        OrderType orderType,
        uint256 tokenId,
        uint256 amount,
        address taker
    ) internal pure returns (bytes memory executionBatch) {
        /* Initialize the batch. Constructing it manually in calldata packing allows for cheaper delegate execution. */
        uint256 arrayLength = Transfer_size + One_word;
        uint256 executionBatchLength = ExecutionBatch_base_size + arrayLength;
        executionBatch = new bytes(executionBatchLength);
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            mstore(add(calldataPointer, ExecutionBatch_taker_offset), taker)
            mstore(add(calldataPointer, ExecutionBatch_orderType_offset), orderType)
            mstore(add(calldataPointer, ExecutionBatch_transfers_pointer_offset), ExecutionBatch_transfers_offset) // set the transfers pointer
            mstore(add(calldataPointer, ExecutionBatch_transfers_offset), 1) // set the length of the transfers array
        }
        /* Insert the transfer into the batch. */
        _insertNonfungibleTransfer(executionBatch, order, tokenId, amount);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)
pragma solidity ^0.8.0;
import "./OwnableUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    function __Ownable2Step_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }
    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    address private _pendingOwner;
    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }
    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }
    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/UUPSUpgradeable.sol)
pragma solidity ^0.8.0;
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";
/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }
    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);
    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }
    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }
    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }
    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { Validation } from "./Validation.sol";
import "./lib/Constants.sol";
import {
    Order,
    Exchange,
    FungibleTransfers,
    StateUpdate,
    AtomicExecution,
    AssetType,
    Fees,
    FeeRate,
    Listing,
    Taker,
    Transfer,
    OrderType
} from "./lib/Structs.sol";
import { IDelegate } from "./interfaces/IDelegate.sol";
import { IExecutor } from "./interfaces/IExecutor.sol";
abstract contract Executor is IExecutor, Validation {
    address private immutable _DELEGATE;
    address private immutable _POOL;
    constructor(address delegate, address pool, address proxy) Validation(proxy) {
        _DELEGATE = delegate;
        _POOL = pool;
    }
    receive() external payable {
        if (msg.sender != _POOL) {
            revert Unauthorized();
        }
    }
    /**
     * @notice Insert a validated ask listing into the batch if there's sufficient ETH to fulfill
     * @param executionBatch Execution batch
     * @param fungibleTransfers Fungible transfers
     * @param order Order of the listing to insert
     * @param exchange Exchange containing the listing to insert
     * @param fees Protocol and taker fees
     * @param remainingETH Available ETH remaining
     * @return Available ETH remaining after insertion; if the listing was inserted in the batch
     */
    function _insertExecutionAsk(
        bytes memory executionBatch,
        FungibleTransfers memory fungibleTransfers,
        Order memory order,
        Exchange memory exchange,
        Fees memory fees,
        uint256 remainingETH
    ) internal pure returns (uint256, bool) {
        uint256 takerAmount = exchange.taker.amount;
        (
            uint256 totalPrice,
            uint256 protocolFeeAmount,
            uint256 makerFeeAmount,
            uint256 takerFeeAmount
        ) = _computeFees(exchange.listing.price, takerAmount, order.makerFee, fees);
        /* Only insert the executions if there are sufficient funds to execute. */
        if (remainingETH >= totalPrice + takerFeeAmount) {
            unchecked {
                remainingETH = remainingETH - totalPrice - takerFeeAmount;
            }
            _setAddresses(fungibleTransfers, order);
            uint256 index = _insertNonfungibleTransfer(
                executionBatch,
                order,
                exchange.listing.tokenId,
                takerAmount
            );
            _insertFungibleTransfers(
                fungibleTransfers,
                takerAmount,
                exchange.listing,
                bytes32(order.salt),
                index,
                totalPrice,
                protocolFeeAmount,
                makerFeeAmount,
                takerFeeAmount,
                true
            );
            return (remainingETH, true);
        } else {
            return (remainingETH, false);
        }
    }
    /**
     * @notice Insert a validated bid listing into the batch
     * @param executionBatch Execution batch
     * @param fungibleTransfers Fungible transfers
     * @param order Order of the listing to insert
     * @param exchange Exchange containing listing to insert
     * @param fees Protocol and taker fees
     */
    function _insertExecutionBid(
        bytes memory executionBatch,
        FungibleTransfers memory fungibleTransfers,
        Order memory order,
        Exchange memory exchange,
        Fees memory fees
    ) internal pure {
        uint256 takerAmount = exchange.taker.amount;
        (
            uint256 totalPrice,
            uint256 protocolFeeAmount,
            uint256 makerFeeAmount,
            uint256 takerFeeAmount
        ) = _computeFees(exchange.listing.price, takerAmount, order.makerFee, fees);
        _setAddresses(fungibleTransfers, order);
        uint256 index = _insertNonfungibleTransfer(
            executionBatch,
            order,
            exchange.taker.tokenId,
            takerAmount
        );
        _insertFungibleTransfers(
            fungibleTransfers,
            takerAmount,
            exchange.listing,
            bytes32(order.salt),
            index,
            totalPrice,
            protocolFeeAmount,
            makerFeeAmount,
            takerFeeAmount,
            false
        );
    }
    /**
     * @notice Insert the nonfungible transfer into the batch
     * @param executionBatch Execution batch
     * @param order Order
     * @param tokenId Token id
     * @param amount Number of token units
     * @return transferIndex Index of the transfer
     */
    function _insertNonfungibleTransfer(
        bytes memory executionBatch,
        Order memory order,
        uint256 tokenId,
        uint256 amount
    ) internal pure returns (uint256 transferIndex) {
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            transferIndex := mload(add(calldataPointer, ExecutionBatch_length_offset))
            let transfersOffset := mload(add(calldataPointer, ExecutionBatch_transfers_pointer_offset))
            let transferPointer := add(
                add(calldataPointer, add(transfersOffset, One_word)),
                mul(transferIndex, Transfer_size)
            )
            mstore(
                add(transferPointer, Transfer_trader_offset),
                mload(add(order, Order_trader_offset))
            ) // set the trader
            mstore(add(transferPointer, Transfer_id_offset), tokenId) // set the token id
            mstore(
                add(transferPointer, Transfer_collection_offset),
                mload(add(order, Order_collection_offset))
            ) // set the collection
            mstore(
                add(transferPointer, Transfer_assetType_offset),
                mload(add(order, Order_assetType_offset))
            ) // set the asset type
            mstore(add(calldataPointer, ExecutionBatch_length_offset), add(transferIndex, 1)) // increment the batch length
            if eq(mload(add(order, Order_assetType_offset)), AssetType_ERC1155) {
                mstore(add(transferPointer, Transfer_amount_offset), amount) // set the amount (don't need to set for ERC721's)
            }
        }
    }
    /**
     * @notice Insert the fungible transfers that need to be executed atomically
     * @param fungibleTransfers Fungible transfers struct
     * @param takerAmount Amount of the listing being taken
     * @param listing Listing to execute
     * @param orderHash Order hash
     * @param index Execution index
     * @param totalPrice Total price of the purchased tokens
     * @param protocolFeeAmount Computed protocol fee
     * @param makerFeeAmount Computed maker fee
     * @param takerFeeAmount Computed taker fee
     * @param makerIsSeller Is the order maker the seller
     */
    function _insertFungibleTransfers(
        FungibleTransfers memory fungibleTransfers,
        uint256 takerAmount,
        Listing memory listing,
        bytes32 orderHash,
        uint256 index,
        uint256 totalPrice,
        uint256 protocolFeeAmount,
        uint256 makerFeeAmount,
        uint256 takerFeeAmount,
        bool makerIsSeller
    ) internal pure {
        uint256 makerId = fungibleTransfers.makerId;
        fungibleTransfers.executions[index].makerId = makerId;
        fungibleTransfers.executions[index].makerFeeRecipientId = fungibleTransfers.feeRecipientId;
        fungibleTransfers.executions[index].stateUpdate = StateUpdate({
            trader: fungibleTransfers.makers[makerId],
            hash: orderHash,
            index: listing.index,
            value: takerAmount,
            maxAmount: listing.amount
        });
        if (makerIsSeller) {
            unchecked {
                fungibleTransfers.executions[index].sellerAmount =
                    totalPrice -
                    protocolFeeAmount -
                    makerFeeAmount;
            }
        } else {
            unchecked {
                fungibleTransfers.executions[index].sellerAmount =
                    totalPrice -
                    protocolFeeAmount -
                    takerFeeAmount;
            }
        }
        fungibleTransfers.executions[index].makerFeeAmount = makerFeeAmount;
        fungibleTransfers.executions[index].takerFeeAmount = takerFeeAmount;
        fungibleTransfers.executions[index].protocolFeeAmount = protocolFeeAmount;
    }
    /**
     * @notice Set the addresses of the maker fee recipient and order maker if different than currently being batched
     * @param fungibleTransfers Fungible transfers struct
     * @param order Parent order of listing being added to the batch
     */
    function _setAddresses(
        FungibleTransfers memory fungibleTransfers,
        Order memory order
    ) internal pure {
        address feeRecipient = order.makerFee.recipient;
        uint256 feeRecipientId = fungibleTransfers.feeRecipientId;
        address currentFeeRecipient = fungibleTransfers.feeRecipients[feeRecipientId];
        if (feeRecipient != currentFeeRecipient) {
            if (currentFeeRecipient == address(0)) {
                fungibleTransfers.feeRecipients[feeRecipientId] = feeRecipient;
            } else {
                unchecked {
                    fungibleTransfers.feeRecipients[++feeRecipientId] = feeRecipient;
                }
                fungibleTransfers.feeRecipientId = feeRecipientId;
            }
        }
        address trader = order.trader;
        uint256 makerId = fungibleTransfers.makerId;
        address currentTrader = fungibleTransfers.makers[makerId];
        if (trader != currentTrader) {
            if (currentTrader == address(0)) {
                fungibleTransfers.makers[makerId] = trader;
            } else {
                unchecked {
                    fungibleTransfers.makers[++makerId] = trader;
                }
                fungibleTransfers.makerId = makerId;
            }
        }
    }
    /**
     * @notice Compute all necessary fees to be taken
     * @param pricePerToken Price per token unit
     * @param takerAmount Number of token units taken (should only be greater than 1 for ERC1155)
     * @param fees Protocol and taker fee set by the transaction
     */
    function _computeFees(
        uint256 pricePerToken,
        uint256 takerAmount,
        FeeRate memory makerFee,
        Fees memory fees
    )
        internal
        pure
        returns (
            uint256 totalPrice,
            uint256 protocolFeeAmount,
            uint256 makerFeeAmount,
            uint256 takerFeeAmount
        )
    {
        totalPrice = pricePerToken * takerAmount;
        makerFeeAmount = (totalPrice * makerFee.rate) / _BASIS_POINTS;
        takerFeeAmount = (totalPrice * fees.takerFee.rate) / _BASIS_POINTS;
        protocolFeeAmount = (totalPrice * fees.protocolFee.rate) / _BASIS_POINTS;
    }
    /*//////////////////////////////////////////////////////////////
                        EXECUTION FUNCTIONS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Execute the transfers by first attempting the nonfungible transfers, for the successful transfers sum the fungible transfers by the recipients and execute
     * @param executionBatch Execution batch struct
     * @param fungibleTransfers Fungible transfers struct
     * @param fees Protocol, maker, taker fees (note: makerFee will be inaccurate at this point in execution)
     * @param orderType Order type
     */
    function _executeBatchTransfer(
        bytes memory executionBatch,
        FungibleTransfers memory fungibleTransfers,
        Fees memory fees,
        OrderType orderType
    ) internal {
        uint256 batchLength;
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            batchLength := mload(add(calldataPointer, ExecutionBatch_length_offset))
        }
        if (batchLength > 0) {
            bool[] memory successfulTransfers = _executeNonfungibleTransfers(
                executionBatch,
                batchLength
            );
            uint256 transfersLength = successfulTransfers.length;
            for (uint256 i; i < transfersLength; ) {
                if (successfulTransfers[i]) {
                    AtomicExecution memory execution = fungibleTransfers.executions[i];
                    FeeRate memory makerFee;
                    uint256 price;
                    unchecked {
                        if (orderType == OrderType.ASK) {
                            fungibleTransfers.makerTransfers[execution.makerId] += execution
                                .sellerAmount; // amount that needs to be sent *to* the order maker
                            price =
                                execution.sellerAmount +
                                execution.protocolFeeAmount +
                                execution.makerFeeAmount;
                        } else {
                            fungibleTransfers.makerTransfers[execution.makerId] +=
                                execution.protocolFeeAmount +
                                execution.makerFeeAmount +
                                execution.takerFeeAmount +
                                execution.sellerAmount; // amount that needs to be taken *from* the order maker
                            price =
                                execution.sellerAmount +
                                execution.protocolFeeAmount +
                                execution.takerFeeAmount;
                        }
                        fungibleTransfers.totalSellerTransfer += execution.sellerAmount; // only for bids
                        fungibleTransfers.totalProtocolFee += execution.protocolFeeAmount;
                        fungibleTransfers.totalTakerFee += execution.takerFeeAmount;
                        fungibleTransfers.feeTransfers[execution.makerFeeRecipientId] += execution
                            .makerFeeAmount;
                        makerFee = FeeRate(
                            fungibleTransfers.feeRecipients[execution.makerFeeRecipientId],
                            uint16((execution.makerFeeAmount * _BASIS_POINTS) / price)
                        );
                    }
                    /* Commit state updates. */
                    StateUpdate memory stateUpdate = fungibleTransfers.executions[i].stateUpdate;
                    {
                        address trader = stateUpdate.trader;
                        bytes32 hash = stateUpdate.hash;
                        uint256 index = stateUpdate.index;
                        uint256 _amountTaken = amountTaken[trader][hash][index];
                        uint256 newAmountTaken = _amountTaken + stateUpdate.value;
                        /* Overfulfilled Listings should be caught prior to inserting into the batch, but this check prevents any misuse. */
                        if (newAmountTaken <= stateUpdate.maxAmount) {
                            amountTaken[trader][hash][index] = newAmountTaken;
                        } else {
                            revert OrderFulfilled();
                        }
                    }
                    _emitExecutionEventFromBatch(
                        executionBatch,
                        price,
                        makerFee,
                        fees,
                        stateUpdate,
                        orderType,
                        i
                    );
                }
                unchecked {
                    ++i;
                }
            }
            if (orderType == OrderType.ASK) {
                /* Transfer the payments to the sellers. */
                uint256 makersLength = fungibleTransfers.makerId + 1;
                for (uint256 i; i < makersLength; ) {
                    _transferETH(fungibleTransfers.makers[i], fungibleTransfers.makerTransfers[i]);
                    unchecked {
                        ++i;
                    }
                }
                /* Transfer the fees to the fee recipients. */
                uint256 feesLength = fungibleTransfers.feeRecipientId + 1;
                for (uint256 i; i < feesLength; ) {
                    _transferETH(
                        fungibleTransfers.feeRecipients[i],
                        fungibleTransfers.feeTransfers[i]
                    );
                    unchecked {
                        ++i;
                    }
                }
                /* Transfer the protocol fees. */
                _transferETH(fees.protocolFee.recipient, fungibleTransfers.totalProtocolFee);
                /* Transfer the taker fees. */
                _transferETH(fees.takerFee.recipient, fungibleTransfers.totalTakerFee);
            } else {
                /* Take the pool funds from the buyers. */
                uint256 makersLength = fungibleTransfers.makerId + 1;
                for (uint256 i; i < makersLength; ) {
                    _transferPool(
                        fungibleTransfers.makers[i],
                        address(this),
                        fungibleTransfers.makerTransfers[i]
                    );
                    unchecked {
                        ++i;
                    }
                }
                /* Transfer the payment to the seller. */
                _transferPool(address(this), msg.sender, fungibleTransfers.totalSellerTransfer);
                /* Transfer the fees to the fee recipients. */
                uint256 feesLength = fungibleTransfers.feeRecipientId + 1;
                for (uint256 i; i < feesLength; ) {
                    _transferPool(
                        address(this),
                        fungibleTransfers.feeRecipients[i],
                        fungibleTransfers.feeTransfers[i]
                    );
                    unchecked {
                        ++i;
                    }
                }
                /* Transfer the protocol fees. */
                _transferPool(
                    address(this),
                    fees.protocolFee.recipient,
                    fungibleTransfers.totalProtocolFee
                );
                /* Transfer the taker fees. */
                _transferPool(
                    address(this),
                    fees.takerFee.recipient,
                    fungibleTransfers.totalTakerFee
                );
            }
        }
    }
    /**
     * @notice Attempt to execute a series of nonfungible transfers through the delegate; reverts will be skipped
     * @param executionBatch Execution batch struct
     * @param batchIndex Current available transfer slot in the batch
     * @return Array indicating which transfers were successful
     */
    function _executeNonfungibleTransfers(
        bytes memory executionBatch,
        uint256 batchIndex
    ) internal returns (bool[] memory) {
        address delegate = _DELEGATE;
        /* Initialize the memory space for the successful transfers array returned from the Delegate call. */
        uint256 successfulTransfersPointer;
        assembly {
            successfulTransfersPointer := mload(Memory_pointer)
            /* Need to shift the free memory pointer ahead one word to account for the array pointer returned from the call. */
            mstore(Memory_pointer, add(successfulTransfersPointer, One_word))
        }
        bool[] memory successfulTransfers = new bool[](batchIndex);
        assembly {
            let size := mload(executionBatch)
            let selectorPointer := add(executionBatch, ExecutionBatch_selector_offset)
            mstore(selectorPointer, shr(Bytes4_shift, Delegate_transfer_selector))
            let success := call(
                gas(),
                delegate,
                0,
                add(selectorPointer, Delegate_transfer_calldata_offset),
                sub(size, Delegate_transfer_calldata_offset),
                successfulTransfersPointer,
                add(0x40, mul(batchIndex, One_word))
            )
        }
        return successfulTransfers;
    }
    /*//////////////////////////////////////////////////////////////
                        TRANSFER FUNCTIONS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Transfer ETH
     * @param to Recipient address
     * @param amount Amount of ETH to send
     */
    function _transferETH(address to, uint256 amount) internal {
        if (amount > 0) {
            bool success;
            assembly {
                success := call(gas(), to, amount, 0, 0, 0, 0)
            }
            if (!success) {
                revert ETHTransferFailed();
            }
        }
    }
    /**
     * @notice Transfer pool funds on behalf of a user
     * @param from Sender address
     * @param to Recipient address
     * @param amount Amount to send
     */
    function _transferPool(address from, address to, uint256 amount) internal {
        if (amount > 0) {
            bool success;
            address pool = _POOL;
            assembly {
                let x := mload(Memory_pointer)
                mstore(x, ERC20_transferFrom_selector)
                mstore(add(x, ERC20_transferFrom_from_offset), from)
                mstore(add(x, ERC20_transferFrom_to_offset), to)
                mstore(add(x, ERC20_transferFrom_amount_offset), amount)
                success := call(gas(), pool, 0, x, ERC20_transferFrom_size, 0, 0)
            }
            if (!success) {
                revert PoolTransferFailed();
            }
        }
    }
    /**
     * @notice Deposit ETH to user's pool funds
     * @param to Recipient address
     * @param amount Amount of ETH to deposit
     */
    function _depositPool(address to, uint256 amount) internal {
        bool success;
        address pool = _POOL;
        assembly {
            let x := mload(Memory_pointer)
            mstore(x, Pool_deposit_selector)
            mstore(add(x, Pool_deposit_user_offset), to)
            success := call(gas(), pool, amount, x, Pool_deposit_size, 0, 0)
        }
        if (!success) {
            revert PoolDepositFailed();
        }
    }
    /**
     * @notice Withdraw ETH from user's pool funds
     * @param from Address to withdraw from
     * @param amount Amount of ETH to withdraw
     */
    function _withdrawFromPool(address from, uint256 amount) internal {
        bool success;
        address pool = _POOL;
        assembly {
            let x := mload(Memory_pointer)
            mstore(x, Pool_withdrawFrom_selector)
            mstore(add(x, Pool_withdrawFrom_from_offset), from)
            mstore(add(x, Pool_withdrawFrom_to_offset), address())
            mstore(add(x, Pool_withdrawFrom_amount_offset), amount)
            success := call(gas(), pool, 0, x, Pool_withdrawFrom_size, 0, 0)
        }
        if (!success) {
            revert PoolWithdrawFromFailed();
        }
    }
    /*//////////////////////////////////////////////////////////////
                          EVENT EMITTERS
    //////////////////////////////////////////////////////////////*/
    /**
     * @notice Emit Execution event from a single execution
     * @param executionBatch Execution batch struct
     * @param price Price of the token purchased
     * @param fees Protocol, maker, and taker fees taken
     * @param stateUpdate Fulfillment to be recorded with a successful execution
     * @param orderType Order type
     * @param transferIndex Index of the transfer corresponding to the execution
     */
    function _emitExecutionEventFromBatch(
        bytes memory executionBatch,
        uint256 price,
        FeeRate memory makerFee,
        Fees memory fees,
        StateUpdate memory stateUpdate,
        OrderType orderType,
        uint256 transferIndex
    ) internal {
        Transfer memory transfer;
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            let transfersOffset := mload(add(calldataPointer, ExecutionBatch_transfers_pointer_offset))
            transfer := add(
                add(calldataPointer, add(transfersOffset, One_word)),
                mul(transferIndex, Transfer_size)
            )
        }
        _emitOptimalExecutionEvent(
            transfer,
            stateUpdate.hash,
            stateUpdate.index,
            price,
            makerFee,
            fees,
            orderType
        );
    }
    /**
     * @notice Emit the Execution event that minimizes the number of bytes in the log
     * @param transfer The nft transfer
     * @param orderHash Order hash
     * @param listingIndex Index of the listing being fulfilled within the order
     * @param price Price of the token purchased
     * @param makerFee Maker fees taken
     * @param fees Protocol, and taker fees taken
     * @param orderType Order type
     */
    function _emitOptimalExecutionEvent(
        Transfer memory transfer,
        bytes32 orderHash,
        uint256 listingIndex,
        uint256 price,
        FeeRate memory makerFee,
        Fees memory fees,
        OrderType orderType
    ) internal {
        if (
            // see _insertNonfungibleTransfer; ERC721 transfers don't set the transfer amount,
            // so we can assume the transfer amount and not check it
            transfer.assetType == AssetType.ERC721 &&
            fees.protocolFee.rate == 0 &&
            transfer.id < 1 << (11 * 8) &&
            listingIndex < 1 << (1 * 8) &&
            price < 1 << (11 * 8)
        ) {
            if (makerFee.rate == 0 && fees.takerFee.rate == 0) {
                emit Execution721Packed(
                    orderHash,
                    packTokenIdListingIndexTrader(transfer.id, listingIndex, transfer.trader),
                    packTypePriceCollection(orderType, price, transfer.collection)
                );
                return;
            } else if (makerFee.rate == 0) {
                emit Execution721TakerFeePacked(
                    orderHash,
                    packTokenIdListingIndexTrader(transfer.id, listingIndex, transfer.trader),
                    packTypePriceCollection(orderType, price, transfer.collection),
                    packFee(fees.takerFee)
                );
                return;
            } else if (fees.takerFee.rate == 0) {
                emit Execution721MakerFeePacked(
                    orderHash,
                    packTokenIdListingIndexTrader(transfer.id, listingIndex, transfer.trader),
                    packTypePriceCollection(orderType, price, transfer.collection),
                    packFee(makerFee)
                );
                return;
            }
        }
        emit Execution({
            transfer: transfer,
            orderHash: orderHash,
            listingIndex: listingIndex,
            price: price,
            makerFee: makerFee,
            fees: fees,
            orderType: orderType
        });
    }
    /**
     * @notice Emit Execution event from a single execution
     * @param executionBatch Execution batch struct
     * @param order Order being fulfilled
     * @param listingIndex Index of the listing being fulfilled within the order
     * @param price Price of the token purchased
     * @param fees Protocol, and taker fees taken
     * @param orderType Order type
     */
    function _emitExecutionEvent(
        bytes memory executionBatch,
        Order memory order,
        uint256 listingIndex,
        uint256 price,
        Fees memory fees,
        OrderType orderType
    ) internal {
        Transfer memory transfer;
        assembly {
            let calldataPointer := add(executionBatch, ExecutionBatch_calldata_offset)
            let transfersOffset := mload(add(calldataPointer, ExecutionBatch_transfers_pointer_offset))
            transfer := add(calldataPointer, add(transfersOffset, One_word))
        }
        _emitOptimalExecutionEvent(
            transfer,
            bytes32(order.salt),
            listingIndex,
            price,
            order.makerFee,
            fees,
            orderType
        );
    }
    function packTokenIdListingIndexTrader(
        uint256 tokenId,
        uint256 listingIndex,
        address trader
    ) private pure returns (uint256) {
        return (tokenId << (21 * 8)) | (listingIndex << (20 * 8)) | uint160(trader);
    }
    function packTypePriceCollection(
        OrderType orderType,
        uint256 price,
        address collection
    ) private pure returns (uint256) {
        return (uint256(orderType) << (31 * 8)) | (price << (20 * 8)) | uint160(collection);
    }
    function packFee(FeeRate memory fee) private pure returns (uint256) {
        return (uint256(fee.rate) << (20 * 8)) | uint160(fee.recipient);
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
uint256 constant Bytes1_shift = 0xf8;
uint256 constant Bytes4_shift = 0xe0;
uint256 constant Bytes20_shift = 0x60;
uint256 constant One_word = 0x20;
uint256 constant Memory_pointer = 0x40;
uint256 constant AssetType_ERC721 = 0;
uint256 constant AssetType_ERC1155 = 1;
uint256 constant OrderType_ASK = 0;
uint256 constant OrderType_BID = 1;
uint256 constant Pool_withdrawFrom_selector = 0x9555a94200000000000000000000000000000000000000000000000000000000;
uint256 constant Pool_withdrawFrom_from_offset = 0x04;
uint256 constant Pool_withdrawFrom_to_offset = 0x24;
uint256 constant Pool_withdrawFrom_amount_offset = 0x44;
uint256 constant Pool_withdrawFrom_size = 0x64;
uint256 constant Pool_deposit_selector = 0xf340fa0100000000000000000000000000000000000000000000000000000000;
uint256 constant Pool_deposit_user_offset = 0x04;
uint256 constant Pool_deposit_size = 0x24;
uint256 constant ERC20_transferFrom_selector = 0x23b872dd00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC721_safeTransferFrom_selector = 0x42842e0e00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC1155_safeTransferFrom_selector = 0xf242432a00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC20_transferFrom_size = 0x64;
uint256 constant ERC721_safeTransferFrom_size = 0x64;
uint256 constant ERC1155_safeTransferFrom_size = 0xc4;
uint256 constant OracleSignatures_size = 0x59;
uint256 constant OracleSignatures_s_offset = 0x20;
uint256 constant OracleSignatures_v_offset = 0x40;
uint256 constant OracleSignatures_blockNumber_offset = 0x41;
uint256 constant OracleSignatures_oracle_offset = 0x45;
uint256 constant Signatures_size = 0x41;
uint256 constant Signatures_s_offset = 0x20;
uint256 constant Signatures_v_offset = 0x40;
uint256 constant ERC20_transferFrom_from_offset = 0x4;
uint256 constant ERC20_transferFrom_to_offset = 0x24;
uint256 constant ERC20_transferFrom_amount_offset = 0x44;
uint256 constant ERC721_safeTransferFrom_from_offset = 0x4;
uint256 constant ERC721_safeTransferFrom_to_offset = 0x24;
uint256 constant ERC721_safeTransferFrom_id_offset = 0x44;
uint256 constant ERC1155_safeTransferFrom_from_offset = 0x4;
uint256 constant ERC1155_safeTransferFrom_to_offset = 0x24;
uint256 constant ERC1155_safeTransferFrom_id_offset = 0x44;
uint256 constant ERC1155_safeTransferFrom_amount_offset = 0x64;
uint256 constant ERC1155_safeTransferFrom_data_pointer_offset = 0x84;
uint256 constant ERC1155_safeTransferFrom_data_offset = 0xa4;
uint256 constant Delegate_transfer_selector = 0xa1ccb98e00000000000000000000000000000000000000000000000000000000;
uint256 constant Delegate_transfer_calldata_offset = 0x1c;
uint256 constant Order_size = 0x100;
uint256 constant Order_trader_offset = 0x00;
uint256 constant Order_collection_offset = 0x20;
uint256 constant Order_listingsRoot_offset = 0x40;
uint256 constant Order_numberOfListings_offset = 0x60;
uint256 constant Order_expirationTime_offset = 0x80;
uint256 constant Order_assetType_offset = 0xa0;
uint256 constant Order_makerFee_offset = 0xc0;
uint256 constant Order_salt_offset = 0xe0;
uint256 constant Exchange_size = 0x80;
uint256 constant Exchange_askIndex_offset = 0x00;
uint256 constant Exchange_proof_offset = 0x20;
uint256 constant Exchange_maker_offset = 0x40;
uint256 constant Exchange_taker_offset = 0x60;
uint256 constant BidExchange_size = 0x80;
uint256 constant BidExchange_askIndex_offset = 0x00;
uint256 constant BidExchange_proof_offset = 0x20;
uint256 constant BidExchange_maker_offset = 0x40;
uint256 constant BidExchange_taker_offset = 0x60;
uint256 constant Listing_size = 0x80;
uint256 constant Listing_index_offset = 0x00;
uint256 constant Listing_tokenId_offset = 0x20;
uint256 constant Listing_amount_offset = 0x40;
uint256 constant Listing_price_offset = 0x60;
uint256 constant Taker_size = 0x40;
uint256 constant Taker_tokenId_offset = 0x00;
uint256 constant Taker_amount_offset = 0x20;
uint256 constant StateUpdate_size = 0x80;
uint256 constant StateUpdate_salt_offset = 0x20;
uint256 constant StateUpdate_leaf_offset = 0x40;
uint256 constant StateUpdate_value_offset = 0x60;
uint256 constant Transfer_size = 0xa0;
uint256 constant Transfer_trader_offset = 0x00;
uint256 constant Transfer_id_offset = 0x20;
uint256 constant Transfer_amount_offset = 0x40;
uint256 constant Transfer_collection_offset = 0x60;
uint256 constant Transfer_assetType_offset = 0x80;
uint256 constant ExecutionBatch_selector_offset = 0x20;
uint256 constant ExecutionBatch_calldata_offset = 0x40;
uint256 constant ExecutionBatch_base_size = 0xa0; // size of the executionBatch without the flattened dynamic elements
uint256 constant ExecutionBatch_taker_offset = 0x00;
uint256 constant ExecutionBatch_orderType_offset = 0x20;
uint256 constant ExecutionBatch_transfers_pointer_offset = 0x40;
uint256 constant ExecutionBatch_length_offset = 0x60;
uint256 constant ExecutionBatch_transfers_offset = 0x80;
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
struct TakeAsk {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
    address tokenRecipient;
}
struct TakeAskSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
    address tokenRecipient;
}
struct TakeBid {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
}
struct TakeBidSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
}
enum AssetType {
    ERC721,
    ERC1155
}
enum OrderType {
    ASK,
    BID
}
struct Exchange { // Size: 0x80
    uint256 index; // 0x00
    bytes32[] proof; // 0x20
    Listing listing; // 0x40
    Taker taker; // 0x60
}
struct Listing { // Size: 0x80
    uint256 index; // 0x00
    uint256 tokenId; // 0x20
    uint256 amount; // 0x40
    uint256 price; // 0x60
}
struct Taker { // Size: 0x40
    uint256 tokenId; // 0x00
    uint256 amount; // 0x20
}
struct Order { // Size: 0x100
    address trader; // 0x00
    address collection; // 0x20
    bytes32 listingsRoot; // 0x40
    uint256 numberOfListings; // 0x60
    uint256 expirationTime; // 0x80
    AssetType assetType; // 0xa0
    FeeRate makerFee; // 0xc0
    uint256 salt; // 0xe0
}
/*
Reference only; struct is composed manually using calldata formatting in execution
struct ExecutionBatch { // Size: 0x80
    address taker; // 0x00
    OrderType orderType; // 0x20
    Transfer[] transfers; // 0x40
    uint256 length; // 0x60
}
*/
struct Transfer { // Size: 0xa0
    address trader; // 0x00
    uint256 id; // 0x20
    uint256 amount; // 0x40
    address collection; // 0x60
    AssetType assetType; // 0x80
}
struct FungibleTransfers {
    uint256 totalProtocolFee;
    uint256 totalSellerTransfer;
    uint256 totalTakerFee;
    uint256 feeRecipientId;
    uint256 makerId;
    address[] feeRecipients;
    address[] makers;
    uint256[] makerTransfers;
    uint256[] feeTransfers;
    AtomicExecution[] executions;
}
struct AtomicExecution { // Size: 0xe0
    uint256 makerId; // 0x00
    uint256 sellerAmount; // 0x20
    uint256 makerFeeRecipientId; // 0x40
    uint256 makerFeeAmount; // 0x60
    uint256 takerFeeAmount; // 0x80
    uint256 protocolFeeAmount; // 0xa0
    StateUpdate stateUpdate; // 0xc0
}
struct StateUpdate { // Size: 0xa0
    address trader; // 0x00
    bytes32 hash; // 0x20
    uint256 index; // 0x40
    uint256 value; // 0x60
    uint256 maxAmount; // 0x80
}
struct Fees { // Size: 0x40
    FeeRate protocolFee; // 0x00
    FeeRate takerFee; // 0x20
}
struct FeeRate { // Size: 0x40
    address recipient; // 0x00
    uint16 rate; // 0x20
}
struct Cancel {
    bytes32 hash;
    uint256 index;
    uint256 amount;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    Order,
    Exchange,
    Fees,
    FeeRate,
    AssetType,
    OrderType,
    Transfer,
    FungibleTransfers,
    StateUpdate,
    Cancel,
    Listing
} from "../lib/Structs.sol";
interface IBlurExchangeV2 {
    error InsufficientFunds();
    error TokenTransferFailed();
    error InvalidOrder();
    error ProtocolFeeTooHigh();
    event NewProtocolFee(address indexed recipient, uint16 indexed rate);
    event NewGovernor(address indexed governor);
    event NewBlockRange(uint256 blockRange);
    event CancelTrade(address indexed user, bytes32 hash, uint256 index, uint256 amount);
    event NonceIncremented(address indexed user, uint256 newNonce);
    event SetOracle(address indexed user, bool approved);
    function initialize() external;
    function setProtocolFee(address recipient, uint16 rate) external;
    function setGovernor(address _governor) external;
    function setOracle(address oracle, bool approved) external;
    function setBlockRange(uint256 _blockRange) external;
    function cancelTrades(Cancel[] memory cancels) external;
    function incrementNonce() external;
    /*//////////////////////////////////////////////////////////////
                          EXECUTION WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAsk(TakeAsk memory inputs, bytes calldata oracleSignature) external payable;
    function takeBid(TakeBid memory inputs, bytes calldata oracleSignature) external;
    function takeAskSingle(TakeAskSingle memory inputs, bytes calldata oracleSignature) external payable;
    function takeBidSingle(TakeBidSingle memory inputs, bytes calldata oracleSignature) external;
    /*//////////////////////////////////////////////////////////////
                        EXECUTION POOL WRAPPERS
    //////////////////////////////////////////////////////////////*/
    function takeAskSinglePool(
        TakeAskSingle memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
    function takeAskPool(
        TakeAsk memory inputs,
        bytes calldata oracleSignature,
        uint256 amountToWithdraw
    ) external payable;
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.17;
/// @notice Upgradeable gas optimized reentrancy protection for smart contracts.
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/ReentrancyGuard.sol)
abstract contract ReentrancyGuardUpgradeable {
    uint256 private locked;
    function __Reentrancy_init() internal {
        locked = 1;
    }
    modifier nonReentrant() virtual {
        require(locked == 1, "REENTRANCY");
        locked = 2;
        _;
        locked = 1;
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.2;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);
    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }
    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }
    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }
    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function _functionDelegateCall(address target, bytes memory data) private returns (bytes memory) {
        require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }
    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (interfaces/IERC1967.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.9._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { MerkleProof } from "lib/openzeppelin-contracts/contracts/utils/cryptography/MerkleProof.sol";
import { Signatures } from "./Signatures.sol";
import { AssetType, Order, Exchange, Listing, OrderType, FeeRate, Fees, Taker } from "./lib/Structs.sol";
import { IValidation } from "./interfaces/IValidation.sol";
abstract contract Validation is IValidation, Signatures {
    uint256 internal constant _BASIS_POINTS = 10_000;
    uint256 internal constant _MAX_PROTOCOL_FEE_RATE = 250;
    FeeRate public protocolFee;
    /* amountTaken[user][orderHash][listingIndex] */
    mapping(address => mapping(bytes32 => mapping(uint256 => uint256))) public amountTaken;
    constructor(address proxy) Signatures(proxy) {}
    /**
     * @notice Check if an order has expired
     * @param order Order to check liveness
     * @return Order is live
     */
    function _checkLiveness(Order memory order) private view returns (bool) {
        return (order.expirationTime > block.timestamp);
    }
    /**
     * @notice Check that the fees to be taken will not overflow the purchase price
     * @param makerFee Maker fee amount
     * @param fees Protocol and taker fee rates
     * @return Fees are valid
     */
    function _checkFee(FeeRate memory makerFee, Fees memory fees) private pure returns (bool) {
        return makerFee.rate + fees.takerFee.rate + fees.protocolFee.rate <= _BASIS_POINTS;
    }
    /**
     * @notice Validate a list of orders and prepare arrays for recording pending fulfillments
     * @param orders List of orders
     * @param orderType Order type for all orders
     * @param signatures Bytes array of the order signatures
     * @param fees Protocol and taker fee rates
     */
    function _validateOrders(
        Order[] memory orders,
        OrderType orderType,
        bytes memory signatures,
        Fees memory fees
    ) internal view returns (bool[] memory validOrders, uint256[][] memory pendingAmountTaken) {
        uint256 ordersLength = orders.length;
        validOrders = new bool[](ordersLength);
        pendingAmountTaken = new uint256[][](ordersLength);
        for (uint256 i; i < ordersLength; ) {
            pendingAmountTaken[i] = new uint256[](orders[i].numberOfListings);
            validOrders[i] = _validateOrder(orders[i], orderType, signatures, fees, i);
            unchecked {
                ++i;
            }
        }
    }
    /**
     * @notice Validate an order
     * @param order Order to validate
     * @param orderType Order type
     * @param signatures Bytes array of order signatures
     * @param fees Protocol and taker fee rates
     * @param signatureIndex Index of the order signature
     * @return Validity of the order
     */
    function _validateOrder(
        Order memory order,
        OrderType orderType,
        bytes memory signatures,
        Fees memory fees,
        uint256 signatureIndex
    ) internal view returns (bool) {
        bytes32 orderHash = hashOrder(order, orderType);
        /* After hashing, the salt is no longer needed so we can store the order hash here. */
        order.salt = uint256(orderHash);
        return _verifyAuthorization(
            order.trader,
            orderHash,
            signatures,
            signatureIndex
        ) &&
            _checkLiveness(order) &&
            _checkFee(order.makerFee, fees);
    }
    /**
     * @notice Validate a listing (only valid if the order has be prevalidated)
     * @dev Validation can be manipulated by inputting the same order twice in the orders array,
     * which will effectively bypass the `pendingAmountTaken` check. There is a safety check at the
     * execution phase that will revert the transaction if this manipulation overdraws an order.
     * @param order Order of the listing
     * @param orderType Order type
     * @param exchange Exchange containing the listing
     * @param validOrders List indicated which orders were validated
     * @param pendingAmountTaken Pending fulfillments from the current batch
     * @return validListing Validity of the listing
     */
    function _validateListingFromBatch(
        Order memory order,
        OrderType orderType,
        Exchange memory exchange,
        bool[] memory validOrders,
        uint256[][] memory pendingAmountTaken
    ) internal view returns (bool validListing) {
        Listing memory listing = exchange.listing;
        uint256 listingIndex = listing.index;
        uint256 amountTaken = amountTaken[order.trader][bytes32(order.salt)][listingIndex];
        uint256 pendingAmountTaken = pendingAmountTaken[exchange.index][listingIndex];
        uint256 takerAmount = exchange.taker.amount;
        unchecked {
            validListing =
                validOrders[exchange.index] &&
                _validateListing(order, orderType, exchange) &&
                pendingAmountTaken + takerAmount <= type(uint256).max - amountTaken &&
                amountTaken + pendingAmountTaken + takerAmount <= listing.amount;
        }
    }
    /**
     * @notice Validate a listing and its proposed exchange
     * @param order Order of the listing
     * @param orderType Order type
     * @param exchange Exchange containing the listing
     * @return validListing Validity of the listing and its proposed exchange
     */
    function _validateListing(
        Order memory order,
        OrderType orderType,
        Exchange memory exchange
    ) private pure returns (bool validListing) {
        Listing memory listing = exchange.listing;
        validListing = MerkleProof.verify(exchange.proof, order.listingsRoot, hashListing(listing));
        Taker memory taker = exchange.taker;
        if (orderType == OrderType.ASK) {
            if (order.assetType == AssetType.ERC721) {
                validListing = validListing && taker.amount == 1 && listing.amount == 1;
            }
            validListing = validListing && listing.tokenId == taker.tokenId;
        } else {
            if (order.assetType == AssetType.ERC721) {
                validListing = validListing && taker.amount == 1;
            } else {
                validListing = validListing && listing.tokenId == taker.tokenId;
            }
        }
    }
    /**
     * @notice Validate both the listing and it's parent order (only for single executions)
     * @param order Order of the listing
     * @param orderType Order type
     * @param exchange Exchange containing the listing
     * @param signature Order signature
     * @param fees Protocol and taker fee rates
     * @return Validity of the order and listing
     */
    function _validateOrderAndListing(
        Order memory order,
        OrderType orderType,
        Exchange memory exchange,
        bytes memory signature,
        Fees memory fees
    ) internal view returns (bool) {
        Listing memory listing = exchange.listing;
        uint256 listingIndex = listing.index;
        return
            _validateOrder(order, orderType, signature, fees, 0) &&
            _validateListing(order, orderType, exchange) &&
            amountTaken[order.trader][bytes32(order.salt)][listingIndex] + exchange.taker.amount <=
            listing.amount;
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { AssetType, OrderType, Transfer } from "../lib/Structs.sol";
interface IDelegate {
    function transfer(
        address caller,
        OrderType orderType,
        Transfer[] calldata transfers,
        uint256 length
    ) external returns (bool[] memory successful);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {
    Fees,
    FeeRate,
    Transfer,
    OrderType
} from "../lib/Structs.sol";
interface IExecutor {
    error ETHTransferFailed();
    error PoolTransferFailed();
    error PoolWithdrawFromFailed();
    error PoolDepositFailed();
    error OrderFulfilled();
    event Execution(
        Transfer transfer,
        bytes32 orderHash,
        uint256 listingIndex,
        uint256 price,
        FeeRate makerFee,
        Fees fees,
        OrderType orderType
    );
    event Execution721Packed(
        bytes32 orderHash,
        uint256 tokenIdListingIndexTrader,
        uint256 collectionPriceSide
    );
    event Execution721TakerFeePacked(
        bytes32 orderHash,
        uint256 tokenIdListingIndexTrader,
        uint256 collectionPriceSide,
        uint256 takerFeeRecipientRate
    );
    event Execution721MakerFeePacked(
        bytes32 orderHash,
        uint256 tokenIdListingIndexTrader,
        uint256 collectionPriceSide,
        uint256 makerFeeRecipientRate
    );
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/MerkleProof.sol)
pragma solidity ^0.8.0;
/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }
    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }
    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }
    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }
    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }
    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }
    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;
        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");
        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }
        if (totalHashes > 0) {
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }
    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;
        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");
        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }
        if (totalHashes > 0) {
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }
    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }
    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "./lib/Constants.sol";
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    FeeRate,
    Order,
    OrderType,
    AssetType,
    Listing
} from "./lib/Structs.sol";
import { ISignatures } from "./interfaces/ISignatures.sol";
abstract contract Signatures is ISignatures {
    string private constant _NAME = "Blur Exchange";
    string private constant _VERSION = "1.0";
    bytes32 private immutable _FEE_RATE_TYPEHASH;
    bytes32 private immutable _ORDER_TYPEHASH;
    bytes32 private immutable _DOMAIN_SEPARATOR;
    mapping(address => uint256) public oracles;
    mapping(address => uint256) public nonces;
    uint256 public blockRange;
    constructor(address proxy) {
        (_FEE_RATE_TYPEHASH, _ORDER_TYPEHASH, _DOMAIN_SEPARATOR) = _createTypehashes(proxy);
    }
    /**
     * @notice Verify the domain separator produced during deployment of the implementation matches that of the proxy
     */
    function verifyDomain() public view {
        bytes32 eip712DomainTypehash = keccak256(
            bytes.concat(
                "EIP712Domain(",
                "string name,",
                "string version,",
                "uint256 chainId,",
                "address verifyingContract",
                ")"
            )
        );
        bytes32 domainSeparator = _hashDomain(
            eip712DomainTypehash,
            keccak256(bytes(_NAME)),
            keccak256(bytes(_VERSION)),
            address(this)
        );
        if (_DOMAIN_SEPARATOR != domainSeparator) {
            revert InvalidDomain();
        }
    }
    /**
     * @notice Return version and domain separator
     */
    function information() external view returns (string memory version, bytes32 domainSeparator) {
        version = _VERSION;
        domainSeparator = _DOMAIN_SEPARATOR;
    }
    /**
     * @notice Create a hash of TakeAsk calldata with an approved caller
     * @param inputs TakeAsk inputs
     * @param _caller Address approved to execute the calldata
     * @return Calldata hash
     */
    function hashTakeAsk(TakeAsk memory inputs, address _caller) external pure returns (bytes32) {
        return _hashCalldata(_caller);
    }
    /**
     * @notice Create a hash of TakeBid calldata with an approved caller
     * @param inputs TakeBid inputs
     * @param _caller Address approved to execute the calldata
     * @return Calldata hash
     */
    function hashTakeBid(TakeBid memory inputs, address _caller) external pure returns (bytes32) {
        return _hashCalldata(_caller);
    }
    /**
     * @notice Create a hash of TakeAskSingle calldata with an approved caller
     * @param inputs TakeAskSingle inputs
     * @param _caller Address approved to execute the calldata
     * @return Calldata hash
     */
    function hashTakeAskSingle(
        TakeAskSingle memory inputs,
        address _caller
    ) external pure returns (bytes32) {
        return _hashCalldata(_caller);
    }
    /**
     * @notice Create a hash of TakeBidSingle calldata with an approved caller
     * @param inputs TakeBidSingle inputs
     * @param _caller Address approved to execute the calldata
     * @return Calldata hash
     */
    function hashTakeBidSingle(
        TakeBidSingle memory inputs,
        address _caller
    ) external pure returns (bytes32) {
        return _hashCalldata(_caller);
    }
    /**
     * @notice Create an EIP712 hash of an Order
     * @dev Includes two additional parameters not in the struct (orderType, nonce)
     * @param order Order to hash
     * @param orderType OrderType of the Order
     * @return Order EIP712 hash
     */
    function hashOrder(Order memory order, OrderType orderType) public view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    _ORDER_TYPEHASH,
                    order.trader,
                    order.collection,
                    order.listingsRoot,
                    order.numberOfListings,
                    order.expirationTime,
                    order.assetType,
                    _hashFeeRate(order.makerFee),
                    order.salt,
                    orderType,
                    nonces[order.trader]
                )
            );
    }
    /**
     * @notice Create a hash of a Listing struct
     * @param listing Listing to hash
     * @return Listing hash
     */
    function hashListing(Listing memory listing) public pure returns (bytes32) {
        return keccak256(abi.encode(listing.index, listing.tokenId, listing.amount, listing.price));
    }
    /**
     * @notice Create a hash of calldata with an approved caller
     * @param _caller Address approved to execute the calldata
     * @return hash Calldata hash
     */
    function _hashCalldata(address _caller) internal pure returns (bytes32 hash) {
        assembly {
            let nextPointer := mload(0x40)
            let size := add(sub(nextPointer, 0x80), 0x20)
            mstore(nextPointer, _caller)
            hash := keccak256(0x80, size)
        }
    }
    /**
     * @notice Create an EIP712 hash of a FeeRate struct
     * @param feeRate FeeRate to hash
     * @return FeeRate EIP712 hash
     */
    function _hashFeeRate(FeeRate memory feeRate) private view returns (bytes32) {
        return keccak256(abi.encode(_FEE_RATE_TYPEHASH, feeRate.recipient, feeRate.rate));
    }
    /**
     * @notice Create an EIP712 hash to sign
     * @param hash Primary EIP712 object hash
     * @return EIP712 hash
     */
    function _hashToSign(bytes32 hash) private view returns (bytes32) {
        return keccak256(bytes.concat(bytes2(0x1901), _DOMAIN_SEPARATOR, hash));
    }
    /**
     * @notice Generate all EIP712 Typehashes
     */
    function _createTypehashes(
        address proxy
    )
        private
        view
        returns (bytes32 feeRateTypehash, bytes32 orderTypehash, bytes32 domainSeparator)
    {
        bytes32 eip712DomainTypehash = keccak256(
            bytes.concat(
                "EIP712Domain(",
                "string name,",
                "string version,",
                "uint256 chainId,",
                "address verifyingContract",
                ")"
            )
        );
        bytes memory feeRateTypestring = "FeeRate(address recipient,uint16 rate)";
        orderTypehash = keccak256(
            bytes.concat(
                "Order(",
                "address trader,",
                "address collection,",
                "bytes32 listingsRoot,",
                "uint256 numberOfListings,",
                "uint256 expirationTime,",
                "uint8 assetType,",
                "FeeRate makerFee,",
                "uint256 salt,",
                "uint8 orderType,",
                "uint256 nonce",
                ")",
                feeRateTypestring
            )
        );
        feeRateTypehash = keccak256(feeRateTypestring);
        domainSeparator = _hashDomain(
            eip712DomainTypehash,
            keccak256(bytes(_NAME)),
            keccak256(bytes(_VERSION)),
            proxy
        );
    }
    /**
     * @notice Create an EIP712 domain separator
     * @param eip712DomainTypehash Typehash of the EIP712Domain struct
     * @param nameHash Hash of the contract name
     * @param versionHash Hash of the version string
     * @param proxy Address of the proxy this implementation will be behind
     * @return EIP712Domain hash
     */
    function _hashDomain(
        bytes32 eip712DomainTypehash,
        bytes32 nameHash,
        bytes32 versionHash,
        address proxy
    ) private view returns (bytes32) {
        return
            keccak256(
                abi.encode(eip712DomainTypehash, nameHash, versionHash, block.chainid, proxy)
            );
    }
    /**
     * @notice Verify EIP712 signature
     * @param signer Address of the alleged signer
     * @param hash EIP712 hash
     * @param signatures Packed bytes array of order signatures
     * @param index Index of the signature to verify
     * @return authorized Validity of the signature
     */
    function _verifyAuthorization(
        address signer,
        bytes32 hash,
        bytes memory signatures,
        uint256 index
    ) internal view returns (bool authorized) {
        bytes32 hashToSign = _hashToSign(hash);
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            let signatureOffset := add(add(signatures, One_word), mul(Signatures_size, index))
            r := mload(signatureOffset)
            s := mload(add(signatureOffset, Signatures_s_offset))
            v := shr(Bytes1_shift, mload(add(signatureOffset, Signatures_v_offset)))
        }
        authorized = _verify(signer, hashToSign, v, r, s);
    }
    modifier verifyOracleSignature(bytes32 hash, bytes calldata oracleSignature) {
        bytes32 r;
        bytes32 s;
        uint8 v;
        uint32 blockNumber;
        address oracle;
        assembly {
            let signatureOffset := oracleSignature.offset
            r := calldataload(signatureOffset)
            s := calldataload(add(signatureOffset, OracleSignatures_s_offset))
            v := shr(Bytes1_shift, calldataload(add(signatureOffset, OracleSignatures_v_offset)))
            blockNumber := shr(
                Bytes4_shift,
                calldataload(add(signatureOffset, OracleSignatures_blockNumber_offset))
            )
            oracle := shr(
                Bytes20_shift,
                calldataload(add(signatureOffset, OracleSignatures_oracle_offset))
            )
        }
        if (blockNumber + blockRange < block.number) {
            revert ExpiredOracleSignature();
        }
        if (oracles[oracle] == 0) {
            revert UnauthorizedOracle();
        }
        if (!_verify(oracle, keccak256(abi.encodePacked(hash, blockNumber)), v, r, s)) {
            revert InvalidOracleSignature();
        }
        _;
    }
    /**
     * @notice Verify signature of digest
     * @param signer Address of expected signer
     * @param digest Signature digest
     * @param v v parameter
     * @param r r parameter
     * @param s s parameter
     */
    function _verify(
        address signer,
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) private pure returns (bool valid) {
        address recoveredSigner = ecrecover(digest, v, r, s);
        if (recoveredSigner != address(0) && recoveredSigner == signer) {
            valid = true;
        }
    }
    uint256[47] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { FeeRate } from "../lib/Structs.sol";
interface IValidation {
    function protocolFee() external view returns (address, uint16);
    function amountTaken(address user, bytes32 hash, uint256 listingIndex) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {
    TakeAsk,
    TakeBid,
    TakeAskSingle,
    TakeBidSingle,
    Order,
    OrderType,
    Listing
} from "../lib/Structs.sol";
interface ISignatures {
    error Unauthorized();
    error ExpiredOracleSignature();
    error UnauthorizedOracle();
    error InvalidOracleSignature();
    error InvalidDomain();
    function oracles(address oracle) external view returns (uint256);
    function nonces(address user) external view returns (uint256);
    function blockRange() external view returns (uint256);
    function verifyDomain() external view;
    function information() external view returns (string memory version, bytes32 domainSeparator);
    function hashListing(Listing memory listing) external pure returns (bytes32);
    function hashOrder(Order memory order, OrderType orderType) external view returns (bytes32);
    function hashTakeAsk(TakeAsk memory inputs, address _caller) external pure returns (bytes32);
    function hashTakeBid(TakeBid memory inputs, address _caller) external pure returns (bytes32);
    function hashTakeAskSingle(TakeAskSingle memory inputs, address _caller) external pure returns (bytes32);
    function hashTakeBidSingle(TakeBidSingle memory inputs, address _caller) external pure returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { ERC721 } from "lib/solmate/src/tokens/ERC721.sol";
import { ERC1155 } from "lib/solmate/src/tokens/ERC1155.sol";
import { ERC20 } from "lib/solmate/src/tokens/ERC20.sol";
import "./lib/Constants.sol";
import { AssetType, OrderType, Transfer } from "./lib/Structs.sol";
contract Delegate {
    error Unauthorized();
    error InvalidLength();
    address private immutable _EXCHANGE;
    constructor(address exchange) {
        _EXCHANGE = exchange;
    }
    modifier onlyApproved() {
        if (msg.sender != _EXCHANGE) {
            revert Unauthorized();
        }
        _;
    }
    function transfer(
        address taker,
        OrderType orderType,
        Transfer[] calldata transfers,
        uint256 length
    ) external onlyApproved returns (bool[] memory successful) {
        if (transfers.length < length) {
            revert InvalidLength();
        }
        successful = new bool[](length);
        for (uint256 i; i < length; ) {
            assembly {
                let calldataPointer := mload(0x40)
                let transfersPointer := add(transfers.offset, mul(Transfer_size, i))
                let assetType := calldataload(add(transfersPointer, Transfer_assetType_offset))
                switch assetType
                case 0 {
                    // AssetType_ERC721
                    mstore(calldataPointer, ERC721_safeTransferFrom_selector)
                    switch orderType
                    case 0 {
                        // OrderType_ASK; taker is recipient
                        mstore(add(calldataPointer, ERC721_safeTransferFrom_to_offset), taker)
                        mstore(
                            add(calldataPointer, ERC721_safeTransferFrom_from_offset),
                            calldataload(add(transfersPointer, Transfer_trader_offset))
                        )
                    }
                    case 1 {
                        // OrderType_BID; taker is sender
                        mstore(add(calldataPointer, ERC721_safeTransferFrom_from_offset), taker)
                        mstore(
                            add(calldataPointer, ERC721_safeTransferFrom_to_offset),
                            calldataload(add(transfersPointer, Transfer_trader_offset))
                        )
                    }
                    default {
                        revert(0, 0)
                    }
                    mstore(
                        add(calldataPointer, ERC721_safeTransferFrom_id_offset),
                        calldataload(add(transfersPointer, Transfer_id_offset))
                    )
                    let collection := calldataload(
                        add(transfersPointer, Transfer_collection_offset)
                    )
                    let success := call(
                        gas(),
                        collection,
                        0,
                        calldataPointer,
                        ERC721_safeTransferFrom_size,
                        0,
                        0
                    )
                    mstore(add(add(successful, 0x20), mul(0x20, i)), success)
                }
                case 1 {
                    // AssetType_ERC1155
                    mstore(calldataPointer, ERC1155_safeTransferFrom_selector)
                    switch orderType
                    case 0 {
                        // OrderType_ASK; taker is recipient
                        mstore(
                            add(calldataPointer, ERC1155_safeTransferFrom_from_offset),
                            calldataload(
                                add(
                                    transfersPointer,
                                    Transfer_trader_offset
                                )
                            )
                        )
                        mstore(add(calldataPointer, ERC1155_safeTransferFrom_to_offset), taker)
                    }
                    case 1 {
                        // OrderType_BID; taker is sender
                        mstore(
                            add(calldataPointer, ERC1155_safeTransferFrom_to_offset),
                            calldataload(
                                add(
                                    transfersPointer,
                                    Transfer_trader_offset
                                )
                            )
                        )
                        mstore(add(calldataPointer, ERC1155_safeTransferFrom_from_offset), taker)
                    }
                    default {
                        revert(0, 0)
                    }
                    mstore(add(calldataPointer, ERC1155_safeTransferFrom_data_pointer_offset), 0xa0)
                    mstore(add(calldataPointer, ERC1155_safeTransferFrom_data_offset), 0)
                    mstore(
                        add(calldataPointer, ERC1155_safeTransferFrom_id_offset),
                        calldataload(
                            add(transfersPointer, Transfer_id_offset)
                        )
                    )
                    mstore(
                        add(calldataPointer, ERC1155_safeTransferFrom_amount_offset),
                        calldataload(
                            add(
                                transfersPointer,
                                Transfer_amount_offset
                            )
                        )
                    )
                    let collection := calldataload(
                        add(
                            transfersPointer,
                            Transfer_collection_offset
                        )
                    )
                    let success := call(
                        gas(),
                        collection,
                        0,
                        calldataPointer,
                        ERC1155_safeTransferFrom_size,
                        0,
                        0
                    )
                    mstore(add(add(successful, 0x20), mul(0x20, i)), success)
                }
                default {
                    revert(0, 0)
                }
            }
            unchecked {
                ++i;
            }
        }
    }
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern, minimalist, and gas efficient ERC-721 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 indexed id);
    event Approval(address indexed owner, address indexed spender, uint256 indexed id);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /*//////////////////////////////////////////////////////////////
                         METADATA STORAGE/LOGIC
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    function tokenURI(uint256 id) public view virtual returns (string memory);
    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) internal _ownerOf;
    mapping(address => uint256) internal _balanceOf;
    function ownerOf(uint256 id) public view virtual returns (address owner) {
        require((owner = _ownerOf[id]) != address(0), "NOT_MINTED");
    }
    function balanceOf(address owner) public view virtual returns (uint256) {
        require(owner != address(0), "ZERO_ADDRESS");
        return _balanceOf[owner];
    }
    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(uint256 => address) public getApproved;
    mapping(address => mapping(address => bool)) public isApprovedForAll;
    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }
    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 id) public virtual {
        address owner = _ownerOf[id];
        require(msg.sender == owner || isApprovedForAll[owner][msg.sender], "NOT_AUTHORIZED");
        getApproved[id] = spender;
        emit Approval(owner, spender, id);
    }
    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }
    function transferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        require(from == _ownerOf[id], "WRONG_FROM");
        require(to != address(0), "INVALID_RECIPIENT");
        require(
            msg.sender == from || isApprovedForAll[from][msg.sender] || msg.sender == getApproved[id],
            "NOT_AUTHORIZED"
        );
        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        unchecked {
            _balanceOf[from]--;
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        delete getApproved[id];
        emit Transfer(from, to, id);
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes calldata data
    ) public virtual {
        transferFrom(from, to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 id) internal virtual {
        require(to != address(0), "INVALID_RECIPIENT");
        require(_ownerOf[id] == address(0), "ALREADY_MINTED");
        // Counter overflow is incredibly unrealistic.
        unchecked {
            _balanceOf[to]++;
        }
        _ownerOf[id] = to;
        emit Transfer(address(0), to, id);
    }
    function _burn(uint256 id) internal virtual {
        address owner = _ownerOf[id];
        require(owner != address(0), "NOT_MINTED");
        // Ownership check above ensures no underflow.
        unchecked {
            _balanceOf[owner]--;
        }
        delete _ownerOf[id];
        delete getApproved[id];
        emit Transfer(owner, address(0), id);
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL SAFE MINT LOGIC
    //////////////////////////////////////////////////////////////*/
    function _safeMint(address to, uint256 id) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function _safeMint(
        address to,
        uint256 id,
        bytes memory data
    ) internal virtual {
        _mint(to, id);
        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
}
/// @notice A generic interface for a contract which properly accepts ERC721 tokens.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721TokenReceiver {
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC721TokenReceiver.onERC721Received.selector;
    }
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Minimalist and gas efficient standard ERC1155 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC1155.sol)
abstract contract ERC1155 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event TransferSingle(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 id,
        uint256 amount
    );
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] amounts
    );
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    event URI(string value, uint256 indexed id);
    /*//////////////////////////////////////////////////////////////
                             ERC1155 STORAGE
    //////////////////////////////////////////////////////////////*/
    mapping(address => mapping(uint256 => uint256)) public balanceOf;
    mapping(address => mapping(address => bool)) public isApprovedForAll;
    /*//////////////////////////////////////////////////////////////
                             METADATA LOGIC
    //////////////////////////////////////////////////////////////*/
    function uri(uint256 id) public view virtual returns (string memory);
    /*//////////////////////////////////////////////////////////////
                              ERC1155 LOGIC
    //////////////////////////////////////////////////////////////*/
    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) public virtual {
        require(msg.sender == from || isApprovedForAll[from][msg.sender], "NOT_AUTHORIZED");
        balanceOf[from][id] -= amount;
        balanceOf[to][id] += amount;
        emit TransferSingle(msg.sender, from, to, id, amount);
        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155Received(msg.sender, from, id, amount, data) ==
                    ERC1155TokenReceiver.onERC1155Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) public virtual {
        require(ids.length == amounts.length, "LENGTH_MISMATCH");
        require(msg.sender == from || isApprovedForAll[from][msg.sender], "NOT_AUTHORIZED");
        // Storing these outside the loop saves ~15 gas per iteration.
        uint256 id;
        uint256 amount;
        for (uint256 i = 0; i < ids.length; ) {
            id = ids[i];
            amount = amounts[i];
            balanceOf[from][id] -= amount;
            balanceOf[to][id] += amount;
            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                ++i;
            }
        }
        emit TransferBatch(msg.sender, from, to, ids, amounts);
        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155BatchReceived(msg.sender, from, ids, amounts, data) ==
                    ERC1155TokenReceiver.onERC1155BatchReceived.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function balanceOfBatch(address[] calldata owners, uint256[] calldata ids)
        public
        view
        virtual
        returns (uint256[] memory balances)
    {
        require(owners.length == ids.length, "LENGTH_MISMATCH");
        balances = new uint256[](owners.length);
        // Unchecked because the only math done is incrementing
        // the array index counter which cannot possibly overflow.
        unchecked {
            for (uint256 i = 0; i < owners.length; ++i) {
                balances[i] = balanceOf[owners[i]][ids[i]];
            }
        }
    }
    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0xd9b67a26 || // ERC165 Interface ID for ERC1155
            interfaceId == 0x0e89341c; // ERC165 Interface ID for ERC1155MetadataURI
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        balanceOf[to][id] += amount;
        emit TransferSingle(msg.sender, address(0), to, id, amount);
        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155Received(msg.sender, address(0), id, amount, data) ==
                    ERC1155TokenReceiver.onERC1155Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function _batchMint(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        uint256 idsLength = ids.length; // Saves MLOADs.
        require(idsLength == amounts.length, "LENGTH_MISMATCH");
        for (uint256 i = 0; i < idsLength; ) {
            balanceOf[to][ids[i]] += amounts[i];
            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                ++i;
            }
        }
        emit TransferBatch(msg.sender, address(0), to, ids, amounts);
        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155BatchReceived(msg.sender, address(0), ids, amounts, data) ==
                    ERC1155TokenReceiver.onERC1155BatchReceived.selector,
            "UNSAFE_RECIPIENT"
        );
    }
    function _batchBurn(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        uint256 idsLength = ids.length; // Saves MLOADs.
        require(idsLength == amounts.length, "LENGTH_MISMATCH");
        for (uint256 i = 0; i < idsLength; ) {
            balanceOf[from][ids[i]] -= amounts[i];
            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                ++i;
            }
        }
        emit TransferBatch(msg.sender, from, address(0), ids, amounts);
    }
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        balanceOf[from][id] -= amount;
        emit TransferSingle(msg.sender, from, address(0), id, amount);
    }
}
/// @notice A generic interface for a contract which properly accepts ERC1155 tokens.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC1155.sol)
abstract contract ERC1155TokenReceiver {
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC1155TokenReceiver.onERC1155Received.selector;
    }
    function onERC1155BatchReceived(
        address,
        address,
        uint256[] calldata,
        uint256[] calldata,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC1155TokenReceiver.onERC1155BatchReceived.selector;
    }
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    uint8 public immutable decimals;
    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/
    uint256 internal immutable INITIAL_CHAIN_ID;
    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;
    mapping(address => uint256) public nonces;
    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }
    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(msg.sender, to, amount);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
        balanceOf[from] -= amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(from, to, amount);
        return true;
    }
    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");
        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\\x19\\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );
            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");
            allowance[recoveredAddress][spender] = value;
        }
        emit Approval(owner, spender, value);
    }
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }
    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }
    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(address(0), to, amount);
    }
    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;
        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }
        emit Transfer(from, address(0), amount);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
uint256 constant Bytes1_shift = 0xf8;
uint256 constant Bytes4_shift = 0xe0;
uint256 constant Bytes20_shift = 0x60;
uint256 constant One_word = 0x20;
uint256 constant Memory_pointer = 0x40;
uint256 constant AssetType_ERC721 = 0;
uint256 constant AssetType_ERC1155 = 1;
uint256 constant OrderType_ASK = 0;
uint256 constant OrderType_BID = 1;
uint256 constant Pool_withdrawFrom_selector = 0x9555a94200000000000000000000000000000000000000000000000000000000;
uint256 constant Pool_withdrawFrom_from_offset = 0x04;
uint256 constant Pool_withdrawFrom_to_offset = 0x24;
uint256 constant Pool_withdrawFrom_amount_offset = 0x44;
uint256 constant Pool_withdrawFrom_size = 0x64;
uint256 constant Pool_deposit_selector = 0xf340fa0100000000000000000000000000000000000000000000000000000000;
uint256 constant Pool_deposit_user_offset = 0x04;
uint256 constant Pool_deposit_size = 0x24;
uint256 constant ERC20_transferFrom_selector = 0x23b872dd00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC721_safeTransferFrom_selector = 0x42842e0e00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC1155_safeTransferFrom_selector = 0xf242432a00000000000000000000000000000000000000000000000000000000;
uint256 constant ERC20_transferFrom_size = 0x64;
uint256 constant ERC721_safeTransferFrom_size = 0x64;
uint256 constant ERC1155_safeTransferFrom_size = 0xc4;
uint256 constant OracleSignatures_size = 0x59;
uint256 constant OracleSignatures_s_offset = 0x20;
uint256 constant OracleSignatures_v_offset = 0x40;
uint256 constant OracleSignatures_blockNumber_offset = 0x41;
uint256 constant OracleSignatures_oracle_offset = 0x45;
uint256 constant Signatures_size = 0x41;
uint256 constant Signatures_s_offset = 0x20;
uint256 constant Signatures_v_offset = 0x40;
uint256 constant ERC20_transferFrom_from_offset = 0x4;
uint256 constant ERC20_transferFrom_to_offset = 0x24;
uint256 constant ERC20_transferFrom_amount_offset = 0x44;
uint256 constant ERC721_safeTransferFrom_from_offset = 0x4;
uint256 constant ERC721_safeTransferFrom_to_offset = 0x24;
uint256 constant ERC721_safeTransferFrom_id_offset = 0x44;
uint256 constant ERC1155_safeTransferFrom_from_offset = 0x4;
uint256 constant ERC1155_safeTransferFrom_to_offset = 0x24;
uint256 constant ERC1155_safeTransferFrom_id_offset = 0x44;
uint256 constant ERC1155_safeTransferFrom_amount_offset = 0x64;
uint256 constant ERC1155_safeTransferFrom_data_pointer_offset = 0x84;
uint256 constant ERC1155_safeTransferFrom_data_offset = 0xa4;
uint256 constant Delegate_transfer_selector = 0xa1ccb98e00000000000000000000000000000000000000000000000000000000;
uint256 constant Delegate_transfer_calldata_offset = 0x1c;
uint256 constant Order_size = 0x100;
uint256 constant Order_trader_offset = 0x00;
uint256 constant Order_collection_offset = 0x20;
uint256 constant Order_listingsRoot_offset = 0x40;
uint256 constant Order_numberOfListings_offset = 0x60;
uint256 constant Order_expirationTime_offset = 0x80;
uint256 constant Order_assetType_offset = 0xa0;
uint256 constant Order_makerFee_offset = 0xc0;
uint256 constant Order_salt_offset = 0xe0;
uint256 constant Exchange_size = 0x80;
uint256 constant Exchange_askIndex_offset = 0x00;
uint256 constant Exchange_proof_offset = 0x20;
uint256 constant Exchange_maker_offset = 0x40;
uint256 constant Exchange_taker_offset = 0x60;
uint256 constant BidExchange_size = 0x80;
uint256 constant BidExchange_askIndex_offset = 0x00;
uint256 constant BidExchange_proof_offset = 0x20;
uint256 constant BidExchange_maker_offset = 0x40;
uint256 constant BidExchange_taker_offset = 0x60;
uint256 constant Listing_size = 0x80;
uint256 constant Listing_index_offset = 0x00;
uint256 constant Listing_tokenId_offset = 0x20;
uint256 constant Listing_amount_offset = 0x40;
uint256 constant Listing_price_offset = 0x60;
uint256 constant Taker_size = 0x40;
uint256 constant Taker_tokenId_offset = 0x00;
uint256 constant Taker_amount_offset = 0x20;
uint256 constant StateUpdate_size = 0x80;
uint256 constant StateUpdate_salt_offset = 0x20;
uint256 constant StateUpdate_leaf_offset = 0x40;
uint256 constant StateUpdate_value_offset = 0x60;
uint256 constant Transfer_size = 0xa0;
uint256 constant Transfer_trader_offset = 0x00;
uint256 constant Transfer_id_offset = 0x20;
uint256 constant Transfer_amount_offset = 0x40;
uint256 constant Transfer_collection_offset = 0x60;
uint256 constant Transfer_assetType_offset = 0x80;
uint256 constant ExecutionBatch_selector_offset = 0x20;
uint256 constant ExecutionBatch_calldata_offset = 0x40;
uint256 constant ExecutionBatch_base_size = 0xa0; // size of the executionBatch without the flattened dynamic elements
uint256 constant ExecutionBatch_taker_offset = 0x00;
uint256 constant ExecutionBatch_orderType_offset = 0x20;
uint256 constant ExecutionBatch_transfers_pointer_offset = 0x40;
uint256 constant ExecutionBatch_length_offset = 0x60;
uint256 constant ExecutionBatch_transfers_offset = 0x80;
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
struct TakeAsk {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
    address tokenRecipient;
}
struct TakeAskSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
    address tokenRecipient;
}
struct TakeBid {
    Order[] orders;
    Exchange[] exchanges;
    FeeRate takerFee;
    bytes signatures;
}
struct TakeBidSingle {
    Order order;
    Exchange exchange;
    FeeRate takerFee;
    bytes signature;
}
enum AssetType {
    ERC721,
    ERC1155
}
enum OrderType {
    ASK,
    BID
}
struct Exchange { // Size: 0x80
    uint256 index; // 0x00
    bytes32[] proof; // 0x20
    Listing listing; // 0x40
    Taker taker; // 0x60
}
struct Listing { // Size: 0x80
    uint256 index; // 0x00
    uint256 tokenId; // 0x20
    uint256 amount; // 0x40
    uint256 price; // 0x60
}
struct Taker { // Size: 0x40
    uint256 tokenId; // 0x00
    uint256 amount; // 0x20
}
struct Order { // Size: 0x100
    address trader; // 0x00
    address collection; // 0x20
    bytes32 listingsRoot; // 0x40
    uint256 numberOfListings; // 0x60
    uint256 expirationTime; // 0x80
    AssetType assetType; // 0xa0
    FeeRate makerFee; // 0xc0
    uint256 salt; // 0xe0
}
/*
Reference only; struct is composed manually using calldata formatting in execution
struct ExecutionBatch { // Size: 0x80
    address taker; // 0x00
    OrderType orderType; // 0x20
    Transfer[] transfers; // 0x40
    uint256 length; // 0x60
}
*/
struct Transfer { // Size: 0xa0
    address trader; // 0x00
    uint256 id; // 0x20
    uint256 amount; // 0x40
    address collection; // 0x60
    AssetType assetType; // 0x80
}
struct FungibleTransfers {
    uint256 totalProtocolFee;
    uint256 totalSellerTransfer;
    uint256 totalTakerFee;
    uint256 feeRecipientId;
    uint256 makerId;
    address[] feeRecipients;
    address[] makers;
    uint256[] makerTransfers;
    uint256[] feeTransfers;
    AtomicExecution[] executions;
}
struct AtomicExecution { // Size: 0xe0
    uint256 makerId; // 0x00
    uint256 sellerAmount; // 0x20
    uint256 makerFeeRecipientId; // 0x40
    uint256 makerFeeAmount; // 0x60
    uint256 takerFeeAmount; // 0x80
    uint256 protocolFeeAmount; // 0xa0
    StateUpdate stateUpdate; // 0xc0
}
struct StateUpdate { // Size: 0xa0
    address trader; // 0x00
    bytes32 hash; // 0x20
    uint256 index; // 0x40
    uint256 value; // 0x60
    uint256 maxAmount; // 0x80
}
struct Fees { // Size: 0x40
    FeeRate protocolFee; // 0x00
    FeeRate takerFee; // 0x20
}
struct FeeRate { // Size: 0x40
    address recipient; // 0x00
    uint16 rate; // 0x20
}
struct Cancel {
    bytes32 hash;
    uint256 index;
    uint256 amount;
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./base/ModuleManager.sol";
import "./base/OwnerManager.sol";
import "./base/FallbackManager.sol";
import "./base/GuardManager.sol";
import "./common/NativeCurrencyPaymentFallback.sol";
import "./common/Singleton.sol";
import "./common/SignatureDecoder.sol";
import "./common/SecuredTokenTransfer.sol";
import "./common/StorageAccessible.sol";
import "./interfaces/ISignatureValidator.sol";
import "./external/SafeMath.sol";
/**
 * @title Safe - A multisignature wallet with support for confirmations using signed messages based on EIP-712.
 * @dev Most important concepts:
 *      - Threshold: Number of required confirmations for a Safe transaction.
 *      - Owners: List of addresses that control the Safe. They are the only ones that can add/remove owners, change the threshold and
 *        approve transactions. Managed in `OwnerManager`.
 *      - Transaction Hash: Hash of a transaction is calculated using the EIP-712 typed structured data hashing scheme.
 *      - Nonce: Each transaction should have a different nonce to prevent replay attacks.
 *      - Signature: A valid signature of an owner of the Safe for a transaction hash.
 *      - Guard: Guard is a contract that can execute pre- and post- transaction checks. Managed in `GuardManager`.
 *      - Modules: Modules are contracts that can be used to extend the write functionality of a Safe. Managed in `ModuleManager`.
 *      - Fallback: Fallback handler is a contract that can provide additional read-only functional for Safe. Managed in `FallbackManager`.
 *      Note: This version of the implementation contract doesn't emit events for the sake of gas efficiency and therefore requires a tracing node for indexing/
 *      For the events-based implementation see `SafeL2.sol`.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
contract Safe is
    Singleton,
    NativeCurrencyPaymentFallback,
    ModuleManager,
    OwnerManager,
    SignatureDecoder,
    SecuredTokenTransfer,
    ISignatureValidatorConstants,
    FallbackManager,
    StorageAccessible,
    GuardManager
{
    using SafeMath for uint256;
    string public constant VERSION = "1.4.1";
    // keccak256(
    //     "EIP712Domain(uint256 chainId,address verifyingContract)"
    // );
    bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218;
    // keccak256(
    //     "SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 baseGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)"
    // );
    bytes32 private constant SAFE_TX_TYPEHASH = 0xbb8310d486368db6bd6f849402fdd73ad53d316b5a4b2644ad6efe0f941286d8;
    event SafeSetup(address indexed initiator, address[] owners, uint256 threshold, address initializer, address fallbackHandler);
    event ApproveHash(bytes32 indexed approvedHash, address indexed owner);
    event SignMsg(bytes32 indexed msgHash);
    event ExecutionFailure(bytes32 indexed txHash, uint256 payment);
    event ExecutionSuccess(bytes32 indexed txHash, uint256 payment);
    uint256 public nonce;
    bytes32 private _deprecatedDomainSeparator;
    // Mapping to keep track of all message hashes that have been approved by ALL REQUIRED owners
    mapping(bytes32 => uint256) public signedMessages;
    // Mapping to keep track of all hashes (message or transaction) that have been approved by ANY owners
    mapping(address => mapping(bytes32 => uint256)) public approvedHashes;
    // This constructor ensures that this contract can only be used as a singleton for Proxy contracts
    constructor() {
        /**
         * By setting the threshold it is not possible to call setup anymore,
         * so we create a Safe with 0 owners and threshold 1.
         * This is an unusable Safe, perfect for the singleton
         */
        threshold = 1;
    }
    /**
     * @notice Sets an initial storage of the Safe contract.
     * @dev This method can only be called once.
     *      If a proxy was created without setting up, anyone can call setup and claim the proxy.
     * @param _owners List of Safe owners.
     * @param _threshold Number of required confirmations for a Safe transaction.
     * @param to Contract address for optional delegate call.
     * @param data Data payload for optional delegate call.
     * @param fallbackHandler Handler for fallback calls to this contract
     * @param paymentToken Token that should be used for the payment (0 is ETH)
     * @param payment Value that should be paid
     * @param paymentReceiver Address that should receive the payment (or 0 if tx.origin)
     */
    function setup(
        address[] calldata _owners,
        uint256 _threshold,
        address to,
        bytes calldata data,
        address fallbackHandler,
        address paymentToken,
        uint256 payment,
        address payable paymentReceiver
    ) external {
        // setupOwners checks if the Threshold is already set, therefore preventing that this method is called twice
        setupOwners(_owners, _threshold);
        if (fallbackHandler != address(0)) internalSetFallbackHandler(fallbackHandler);
        // As setupOwners can only be called if the contract has not been initialized we don't need a check for setupModules
        setupModules(to, data);
        if (payment > 0) {
            // To avoid running into issues with EIP-170 we reuse the handlePayment function (to avoid adjusting code of that has been verified we do not adjust the method itself)
            // baseGas = 0, gasPrice = 1 and gas = payment => amount = (payment + 0) * 1 = payment
            handlePayment(payment, 0, 1, paymentToken, paymentReceiver);
        }
        emit SafeSetup(msg.sender, _owners, _threshold, to, fallbackHandler);
    }
    /** @notice Executes a `operation` {0: Call, 1: DelegateCall}} transaction to `to` with `value` (Native Currency)
     *          and pays `gasPrice` * `gasLimit` in `gasToken` token to `refundReceiver`.
     * @dev The fees are always transferred, even if the user transaction fails.
     *      This method doesn't perform any sanity check of the transaction, such as:
     *      - if the contract at `to` address has code or not
     *      - if the `gasToken` is a contract or not
     *      It is the responsibility of the caller to perform such checks.
     * @param to Destination address of Safe transaction.
     * @param value Ether value of Safe transaction.
     * @param data Data payload of Safe transaction.
     * @param operation Operation type of Safe transaction.
     * @param safeTxGas Gas that should be used for the Safe transaction.
     * @param baseGas Gas costs that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund)
     * @param gasPrice Gas price that should be used for the payment calculation.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     * @return success Boolean indicating transaction's success.
     */
    function execTransaction(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver,
        bytes memory signatures
    ) public payable virtual returns (bool success) {
        bytes32 txHash;
        // Use scope here to limit variable lifetime and prevent `stack too deep` errors
        {
            bytes memory txHashData = encodeTransactionData(
                // Transaction info
                to,
                value,
                data,
                operation,
                safeTxGas,
                // Payment info
                baseGas,
                gasPrice,
                gasToken,
                refundReceiver,
                // Signature info
                nonce
            );
            // Increase nonce and execute transaction.
            nonce++;
            txHash = keccak256(txHashData);
            checkSignatures(txHash, txHashData, signatures);
        }
        address guard = getGuard();
        {
            if (guard != address(0)) {
                Guard(guard).checkTransaction(
                    // Transaction info
                    to,
                    value,
                    data,
                    operation,
                    safeTxGas,
                    // Payment info
                    baseGas,
                    gasPrice,
                    gasToken,
                    refundReceiver,
                    // Signature info
                    signatures,
                    msg.sender
                );
            }
        }
        // We require some gas to emit the events (at least 2500) after the execution and some to perform code until the execution (500)
        // We also include the 1/64 in the check that is not send along with a call to counteract potential shortings because of EIP-150
        require(gasleft() >= ((safeTxGas * 64) / 63).max(safeTxGas + 2500) + 500, "GS010");
        // Use scope here to limit variable lifetime and prevent `stack too deep` errors
        {
            uint256 gasUsed = gasleft();
            // If the gasPrice is 0 we assume that nearly all available gas can be used (it is always more than safeTxGas)
            // We only substract 2500 (compared to the 3000 before) to ensure that the amount passed is still higher than safeTxGas
            success = execute(to, value, data, operation, gasPrice == 0 ? (gasleft() - 2500) : safeTxGas);
            gasUsed = gasUsed.sub(gasleft());
            // If no safeTxGas and no gasPrice was set (e.g. both are 0), then the internal tx is required to be successful
            // This makes it possible to use `estimateGas` without issues, as it searches for the minimum gas where the tx doesn't revert
            require(success || safeTxGas != 0 || gasPrice != 0, "GS013");
            // We transfer the calculated tx costs to the tx.origin to avoid sending it to intermediate contracts that have made calls
            uint256 payment = 0;
            if (gasPrice > 0) {
                payment = handlePayment(gasUsed, baseGas, gasPrice, gasToken, refundReceiver);
            }
            if (success) emit ExecutionSuccess(txHash, payment);
            else emit ExecutionFailure(txHash, payment);
        }
        {
            if (guard != address(0)) {
                Guard(guard).checkAfterExecution(txHash, success);
            }
        }
    }
    /**
     * @notice Handles the payment for a Safe transaction.
     * @param gasUsed Gas used by the Safe transaction.
     * @param baseGas Gas costs that are independent of the transaction execution (e.g. base transaction fee, signature check, payment of the refund).
     * @param gasPrice Gas price that should be used for the payment calculation.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @return payment The amount of payment made in the specified token.
     */
    function handlePayment(
        uint256 gasUsed,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver
    ) private returns (uint256 payment) {
        // solhint-disable-next-line avoid-tx-origin
        address payable receiver = refundReceiver == address(0) ? payable(tx.origin) : refundReceiver;
        if (gasToken == address(0)) {
            // For ETH we will only adjust the gas price to not be higher than the actual used gas price
            payment = gasUsed.add(baseGas).mul(gasPrice < tx.gasprice ? gasPrice : tx.gasprice);
            require(receiver.send(payment), "GS011");
        } else {
            payment = gasUsed.add(baseGas).mul(gasPrice);
            require(transferToken(gasToken, receiver, payment), "GS012");
        }
    }
    /**
     * @notice Checks whether the signature provided is valid for the provided data and hash. Reverts otherwise.
     * @param dataHash Hash of the data (could be either a message hash or transaction hash)
     * @param data That should be signed (this is passed to an external validator contract)
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     */
    function checkSignatures(bytes32 dataHash, bytes memory data, bytes memory signatures) public view {
        // Load threshold to avoid multiple storage loads
        uint256 _threshold = threshold;
        // Check that a threshold is set
        require(_threshold > 0, "GS001");
        checkNSignatures(dataHash, data, signatures, _threshold);
    }
    /**
     * @notice Checks whether the signature provided is valid for the provided data and hash. Reverts otherwise.
     * @dev Since the EIP-1271 does an external call, be mindful of reentrancy attacks.
     * @param dataHash Hash of the data (could be either a message hash or transaction hash)
     * @param data That should be signed (this is passed to an external validator contract)
     * @param signatures Signature data that should be verified.
     *                   Can be packed ECDSA signature ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     * @param requiredSignatures Amount of required valid signatures.
     */
    function checkNSignatures(bytes32 dataHash, bytes memory data, bytes memory signatures, uint256 requiredSignatures) public view {
        // Check that the provided signature data is not too short
        require(signatures.length >= requiredSignatures.mul(65), "GS020");
        // There cannot be an owner with address 0.
        address lastOwner = address(0);
        address currentOwner;
        uint8 v;
        bytes32 r;
        bytes32 s;
        uint256 i;
        for (i = 0; i < requiredSignatures; i++) {
            (v, r, s) = signatureSplit(signatures, i);
            if (v == 0) {
                require(keccak256(data) == dataHash, "GS027");
                // If v is 0 then it is a contract signature
                // When handling contract signatures the address of the contract is encoded into r
                currentOwner = address(uint160(uint256(r)));
                // Check that signature data pointer (s) is not pointing inside the static part of the signatures bytes
                // This check is not completely accurate, since it is possible that more signatures than the threshold are send.
                // Here we only check that the pointer is not pointing inside the part that is being processed
                require(uint256(s) >= requiredSignatures.mul(65), "GS021");
                // Check that signature data pointer (s) is in bounds (points to the length of data -> 32 bytes)
                require(uint256(s).add(32) <= signatures.length, "GS022");
                // Check if the contract signature is in bounds: start of data is s + 32 and end is start + signature length
                uint256 contractSignatureLen;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    contractSignatureLen := mload(add(add(signatures, s), 0x20))
                }
                require(uint256(s).add(32).add(contractSignatureLen) <= signatures.length, "GS023");
                // Check signature
                bytes memory contractSignature;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    // The signature data for contract signatures is appended to the concatenated signatures and the offset is stored in s
                    contractSignature := add(add(signatures, s), 0x20)
                }
                require(ISignatureValidator(currentOwner).isValidSignature(data, contractSignature) == EIP1271_MAGIC_VALUE, "GS024");
            } else if (v == 1) {
                // If v is 1 then it is an approved hash
                // When handling approved hashes the address of the approver is encoded into r
                currentOwner = address(uint160(uint256(r)));
                // Hashes are automatically approved by the sender of the message or when they have been pre-approved via a separate transaction
                require(msg.sender == currentOwner || approvedHashes[currentOwner][dataHash] != 0, "GS025");
            } else if (v > 30) {
                // If v > 30 then default va (27,28) has been adjusted for eth_sign flow
                // To support eth_sign and similar we adjust v and hash the messageHash with the Ethereum message prefix before applying ecrecover
                currentOwner = ecrecover(keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
32", dataHash)), v - 4, r, s);
            } else {
                // Default is the ecrecover flow with the provided data hash
                // Use ecrecover with the messageHash for EOA signatures
                currentOwner = ecrecover(dataHash, v, r, s);
            }
            require(currentOwner > lastOwner && owners[currentOwner] != address(0) && currentOwner != SENTINEL_OWNERS, "GS026");
            lastOwner = currentOwner;
        }
    }
    /**
     * @notice Marks hash `hashToApprove` as approved.
     * @dev This can be used with a pre-approved hash transaction signature.
     *      IMPORTANT: The approved hash stays approved forever. There's no revocation mechanism, so it behaves similarly to ECDSA signatures
     * @param hashToApprove The hash to mark as approved for signatures that are verified by this contract.
     */
    function approveHash(bytes32 hashToApprove) external {
        require(owners[msg.sender] != address(0), "GS030");
        approvedHashes[msg.sender][hashToApprove] = 1;
        emit ApproveHash(hashToApprove, msg.sender);
    }
    /**
     * @notice Returns the ID of the chain the contract is currently deployed on.
     * @return The ID of the current chain as a uint256.
     */
    function getChainId() public view returns (uint256) {
        uint256 id;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            id := chainid()
        }
        return id;
    }
    /**
     * @dev Returns the domain separator for this contract, as defined in the EIP-712 standard.
     * @return bytes32 The domain separator hash.
     */
    function domainSeparator() public view returns (bytes32) {
        return keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, getChainId(), this));
    }
    /**
     * @notice Returns the pre-image of the transaction hash (see getTransactionHash).
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @param safeTxGas Gas that should be used for the safe transaction.
     * @param baseGas Gas costs for that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund)
     * @param gasPrice Maximum gas price that should be used for this transaction.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param _nonce Transaction nonce.
     * @return Transaction hash bytes.
     */
    function encodeTransactionData(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address refundReceiver,
        uint256 _nonce
    ) public view returns (bytes memory) {
        bytes32 safeTxHash = keccak256(
            abi.encode(
                SAFE_TX_TYPEHASH,
                to,
                value,
                keccak256(data),
                operation,
                safeTxGas,
                baseGas,
                gasPrice,
                gasToken,
                refundReceiver,
                _nonce
            )
        );
        return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator(), safeTxHash);
    }
    /**
     * @notice Returns transaction hash to be signed by owners.
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @param safeTxGas Fas that should be used for the safe transaction.
     * @param baseGas Gas costs for data used to trigger the safe transaction.
     * @param gasPrice Maximum gas price that should be used for this transaction.
     * @param gasToken Token address (or 0 if ETH) that is used for the payment.
     * @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
     * @param _nonce Transaction nonce.
     * @return Transaction hash.
     */
    function getTransactionHash(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address refundReceiver,
        uint256 _nonce
    ) public view returns (bytes32) {
        return keccak256(encodeTransactionData(to, value, data, operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce));
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
/**
 * @title Executor - A contract that can execute transactions
 * @author Richard Meissner - @rmeissner
 */
abstract contract Executor {
    /**
     * @notice Executes either a delegatecall or a call with provided parameters.
     * @dev This method doesn't perform any sanity check of the transaction, such as:
     *      - if the contract at `to` address has code or not
     *      It is the responsibility of the caller to perform such checks.
     * @param to Destination address.
     * @param value Ether value.
     * @param data Data payload.
     * @param operation Operation type.
     * @return success boolean flag indicating if the call succeeded.
     */
    function execute(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation,
        uint256 txGas
    ) internal returns (bool success) {
        if (operation == Enum.Operation.DelegateCall) {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                success := delegatecall(txGas, to, add(data, 0x20), mload(data), 0, 0)
            }
        } else {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                success := call(txGas, to, value, add(data, 0x20), mload(data), 0, 0)
            }
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/SelfAuthorized.sol";
/**
 * @title Fallback Manager - A contract managing fallback calls made to this contract
 * @author Richard Meissner - @rmeissner
 */
abstract contract FallbackManager is SelfAuthorized {
    event ChangedFallbackHandler(address indexed handler);
    // keccak256("fallback_manager.handler.address")
    bytes32 internal constant FALLBACK_HANDLER_STORAGE_SLOT = 0x6c9a6c4a39284e37ed1cf53d337577d14212a4870fb976a4366c693b939918d5;
    /**
     *  @notice Internal function to set the fallback handler.
     *  @param handler contract to handle fallback calls.
     */
    function internalSetFallbackHandler(address handler) internal {
        /*
            If a fallback handler is set to self, then the following attack vector is opened:
            Imagine we have a function like this:
            function withdraw() internal authorized {
                withdrawalAddress.call.value(address(this).balance)("");
            }
            If the fallback method is triggered, the fallback handler appends the msg.sender address to the calldata and calls the fallback handler.
            A potential attacker could call a Safe with the 3 bytes signature of a withdraw function. Since 3 bytes do not create a valid signature,
            the call would end in a fallback handler. Since it appends the msg.sender address to the calldata, the attacker could craft an address 
            where the first 3 bytes of the previous calldata + the first byte of the address make up a valid function signature. The subsequent call would result in unsanctioned access to Safe's internal protected methods.
            For some reason, solidity matches the first 4 bytes of the calldata to a function signature, regardless if more data follow these 4 bytes.
        */
        require(handler != address(this), "GS400");
        bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, handler)
        }
    }
    /**
     * @notice Set Fallback Handler to `handler` for the Safe.
     * @dev Only fallback calls without value and with data will be forwarded.
     *      This can only be done via a Safe transaction.
     *      Cannot be set to the Safe itself.
     * @param handler contract to handle fallback calls.
     */
    function setFallbackHandler(address handler) public authorized {
        internalSetFallbackHandler(handler);
        emit ChangedFallbackHandler(handler);
    }
    // @notice Forwards all calls to the fallback handler if set. Returns 0 if no handler is set.
    // @dev Appends the non-padded caller address to the calldata to be optionally used in the handler
    //      The handler can make us of `HandlerContext.sol` to extract the address.
    //      This is done because in the next call frame the `msg.sender` will be FallbackManager's address
    //      and having the original caller address may enable additional verification scenarios.
    // solhint-disable-next-line payable-fallback,no-complex-fallback
    fallback() external {
        bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let handler := sload(slot)
            if iszero(handler) {
                return(0, 0)
            }
            calldatacopy(0, 0, calldatasize())
            // The msg.sender address is shifted to the left by 12 bytes to remove the padding
            // Then the address without padding is stored right after the calldata
            mstore(calldatasize(), shl(96, caller()))
            // Add 20 bytes for the address appended add the end
            let success := call(gas(), handler, 0, 0, add(calldatasize(), 20), 0, 0)
            returndatacopy(0, 0, returndatasize())
            if iszero(success) {
                revert(0, returndatasize())
            }
            return(0, returndatasize())
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "../interfaces/IERC165.sol";
interface Guard is IERC165 {
    function checkTransaction(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation,
        uint256 safeTxGas,
        uint256 baseGas,
        uint256 gasPrice,
        address gasToken,
        address payable refundReceiver,
        bytes memory signatures,
        address msgSender
    ) external;
    function checkAfterExecution(bytes32 txHash, bool success) external;
}
abstract contract BaseGuard is Guard {
    function supportsInterface(bytes4 interfaceId) external view virtual override returns (bool) {
        return
            interfaceId == type(Guard).interfaceId || // 0xe6d7a83a
            interfaceId == type(IERC165).interfaceId; // 0x01ffc9a7
    }
}
/**
 * @title Guard Manager - A contract managing transaction guards which perform pre and post-checks on Safe transactions.
 * @author Richard Meissner - @rmeissner
 */
abstract contract GuardManager is SelfAuthorized {
    event ChangedGuard(address indexed guard);
    // keccak256("guard_manager.guard.address")
    bytes32 internal constant GUARD_STORAGE_SLOT = 0x4a204f620c8c5ccdca3fd54d003badd85ba500436a431f0cbda4f558c93c34c8;
    /**
     * @dev Set a guard that checks transactions before execution
     *      This can only be done via a Safe transaction.
     *      ⚠️ IMPORTANT: Since a guard has full power to block Safe transaction execution,
     *        a broken guard can cause a denial of service for the Safe. Make sure to carefully
     *        audit the guard code and design recovery mechanisms.
     * @notice Set Transaction Guard `guard` for the Safe. Make sure you trust the guard.
     * @param guard The address of the guard to be used or the 0 address to disable the guard
     */
    function setGuard(address guard) external authorized {
        if (guard != address(0)) {
            require(Guard(guard).supportsInterface(type(Guard).interfaceId), "GS300");
        }
        bytes32 slot = GUARD_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, guard)
        }
        emit ChangedGuard(guard);
    }
    /**
     * @dev Internal method to retrieve the current guard
     *      We do not have a public method because we're short on bytecode size limit,
     *      to retrieve the guard address, one can use `getStorageAt` from `StorageAccessible` contract
     *      with the slot `GUARD_STORAGE_SLOT`
     * @return guard The address of the guard
     */
    function getGuard() internal view returns (address guard) {
        bytes32 slot = GUARD_STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            guard := sload(slot)
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "./Executor.sol";
/**
 * @title Module Manager - A contract managing Safe modules
 * @notice Modules are extensions with unlimited access to a Safe that can be added to a Safe by its owners.
           ⚠️ WARNING: Modules are a security risk since they can execute arbitrary transactions, 
           so only trusted and audited modules should be added to a Safe. A malicious module can
           completely takeover a Safe.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
abstract contract ModuleManager is SelfAuthorized, Executor {
    event EnabledModule(address indexed module);
    event DisabledModule(address indexed module);
    event ExecutionFromModuleSuccess(address indexed module);
    event ExecutionFromModuleFailure(address indexed module);
    address internal constant SENTINEL_MODULES = address(0x1);
    mapping(address => address) internal modules;
    /**
     * @notice Setup function sets the initial storage of the contract.
     *         Optionally executes a delegate call to another contract to setup the modules.
     * @param to Optional destination address of call to execute.
     * @param data Optional data of call to execute.
     */
    function setupModules(address to, bytes memory data) internal {
        require(modules[SENTINEL_MODULES] == address(0), "GS100");
        modules[SENTINEL_MODULES] = SENTINEL_MODULES;
        if (to != address(0)) {
            require(isContract(to), "GS002");
            // Setup has to complete successfully or transaction fails.
            require(execute(to, 0, data, Enum.Operation.DelegateCall, type(uint256).max), "GS000");
        }
    }
    /**
     * @notice Enables the module `module` for the Safe.
     * @dev This can only be done via a Safe transaction.
     * @param module Module to be whitelisted.
     */
    function enableModule(address module) public authorized {
        // Module address cannot be null or sentinel.
        require(module != address(0) && module != SENTINEL_MODULES, "GS101");
        // Module cannot be added twice.
        require(modules[module] == address(0), "GS102");
        modules[module] = modules[SENTINEL_MODULES];
        modules[SENTINEL_MODULES] = module;
        emit EnabledModule(module);
    }
    /**
     * @notice Disables the module `module` for the Safe.
     * @dev This can only be done via a Safe transaction.
     * @param prevModule Previous module in the modules linked list.
     * @param module Module to be removed.
     */
    function disableModule(address prevModule, address module) public authorized {
        // Validate module address and check that it corresponds to module index.
        require(module != address(0) && module != SENTINEL_MODULES, "GS101");
        require(modules[prevModule] == module, "GS103");
        modules[prevModule] = modules[module];
        modules[module] = address(0);
        emit DisabledModule(module);
    }
    /**
     * @notice Execute `operation` (0: Call, 1: DelegateCall) to `to` with `value` (Native Token)
     * @dev Function is virtual to allow overriding for L2 singleton to emit an event for indexing.
     * @param to Destination address of module transaction.
     * @param value Ether value of module transaction.
     * @param data Data payload of module transaction.
     * @param operation Operation type of module transaction.
     * @return success Boolean flag indicating if the call succeeded.
     */
    function execTransactionFromModule(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation
    ) public virtual returns (bool success) {
        // Only whitelisted modules are allowed.
        require(msg.sender != SENTINEL_MODULES && modules[msg.sender] != address(0), "GS104");
        // Execute transaction without further confirmations.
        success = execute(to, value, data, operation, type(uint256).max);
        if (success) emit ExecutionFromModuleSuccess(msg.sender);
        else emit ExecutionFromModuleFailure(msg.sender);
    }
    /**
     * @notice Execute `operation` (0: Call, 1: DelegateCall) to `to` with `value` (Native Token) and return data
     * @param to Destination address of module transaction.
     * @param value Ether value of module transaction.
     * @param data Data payload of module transaction.
     * @param operation Operation type of module transaction.
     * @return success Boolean flag indicating if the call succeeded.
     * @return returnData Data returned by the call.
     */
    function execTransactionFromModuleReturnData(
        address to,
        uint256 value,
        bytes memory data,
        Enum.Operation operation
    ) public returns (bool success, bytes memory returnData) {
        success = execTransactionFromModule(to, value, data, operation);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Load free memory location
            let ptr := mload(0x40)
            // We allocate memory for the return data by setting the free memory location to
            // current free memory location + data size + 32 bytes for data size value
            mstore(0x40, add(ptr, add(returndatasize(), 0x20)))
            // Store the size
            mstore(ptr, returndatasize())
            // Store the data
            returndatacopy(add(ptr, 0x20), 0, returndatasize())
            // Point the return data to the correct memory location
            returnData := ptr
        }
    }
    /**
     * @notice Returns if an module is enabled
     * @return True if the module is enabled
     */
    function isModuleEnabled(address module) public view returns (bool) {
        return SENTINEL_MODULES != module && modules[module] != address(0);
    }
    /**
     * @notice Returns an array of modules.
     *         If all entries fit into a single page, the next pointer will be 0x1.
     *         If another page is present, next will be the last element of the returned array.
     * @param start Start of the page. Has to be a module or start pointer (0x1 address)
     * @param pageSize Maximum number of modules that should be returned. Has to be > 0
     * @return array Array of modules.
     * @return next Start of the next page.
     */
    function getModulesPaginated(address start, uint256 pageSize) external view returns (address[] memory array, address next) {
        require(start == SENTINEL_MODULES || isModuleEnabled(start), "GS105");
        require(pageSize > 0, "GS106");
        // Init array with max page size
        array = new address[](pageSize);
        // Populate return array
        uint256 moduleCount = 0;
        next = modules[start];
        while (next != address(0) && next != SENTINEL_MODULES && moduleCount < pageSize) {
            array[moduleCount] = next;
            next = modules[next];
            moduleCount++;
        }
        /**
          Because of the argument validation, we can assume that the loop will always iterate over the valid module list values
          and the `next` variable will either be an enabled module or a sentinel address (signalling the end). 
          
          If we haven't reached the end inside the loop, we need to set the next pointer to the last element of the modules array
          because the `next` variable (which is a module by itself) acting as a pointer to the start of the next page is neither 
          included to the current page, nor will it be included in the next one if you pass it as a start.
        */
        if (next != SENTINEL_MODULES) {
            next = array[moduleCount - 1];
        }
        // Set correct size of returned array
        // solhint-disable-next-line no-inline-assembly
        assembly {
            mstore(array, moduleCount)
        }
    }
    /**
     * @notice Returns true if `account` is a contract.
     * @dev This function will return false if invoked during the constructor of a contract,
     *      as the code is not actually created until after the constructor finishes.
     * @param account The address being queried
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/SelfAuthorized.sol";
/**
 * @title OwnerManager - Manages Safe owners and a threshold to authorize transactions.
 * @dev Uses a linked list to store the owners because the code generate by the solidity compiler
 *      is more efficient than using a dynamic array.
 * @author Stefan George - @Georgi87
 * @author Richard Meissner - @rmeissner
 */
abstract contract OwnerManager is SelfAuthorized {
    event AddedOwner(address indexed owner);
    event RemovedOwner(address indexed owner);
    event ChangedThreshold(uint256 threshold);
    address internal constant SENTINEL_OWNERS = address(0x1);
    mapping(address => address) internal owners;
    uint256 internal ownerCount;
    uint256 internal threshold;
    /**
     * @notice Sets the initial storage of the contract.
     * @param _owners List of Safe owners.
     * @param _threshold Number of required confirmations for a Safe transaction.
     */
    function setupOwners(address[] memory _owners, uint256 _threshold) internal {
        // Threshold can only be 0 at initialization.
        // Check ensures that setup function can only be called once.
        require(threshold == 0, "GS200");
        // Validate that threshold is smaller than number of added owners.
        require(_threshold <= _owners.length, "GS201");
        // There has to be at least one Safe owner.
        require(_threshold >= 1, "GS202");
        // Initializing Safe owners.
        address currentOwner = SENTINEL_OWNERS;
        for (uint256 i = 0; i < _owners.length; i++) {
            // Owner address cannot be null.
            address owner = _owners[i];
            require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this) && currentOwner != owner, "GS203");
            // No duplicate owners allowed.
            require(owners[owner] == address(0), "GS204");
            owners[currentOwner] = owner;
            currentOwner = owner;
        }
        owners[currentOwner] = SENTINEL_OWNERS;
        ownerCount = _owners.length;
        threshold = _threshold;
    }
    /**
     * @notice Adds the owner `owner` to the Safe and updates the threshold to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param owner New owner address.
     * @param _threshold New threshold.
     */
    function addOwnerWithThreshold(address owner, uint256 _threshold) public authorized {
        // Owner address cannot be null, the sentinel or the Safe itself.
        require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this), "GS203");
        // No duplicate owners allowed.
        require(owners[owner] == address(0), "GS204");
        owners[owner] = owners[SENTINEL_OWNERS];
        owners[SENTINEL_OWNERS] = owner;
        ownerCount++;
        emit AddedOwner(owner);
        // Change threshold if threshold was changed.
        if (threshold != _threshold) changeThreshold(_threshold);
    }
    /**
     * @notice Removes the owner `owner` from the Safe and updates the threshold to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param prevOwner Owner that pointed to the owner to be removed in the linked list
     * @param owner Owner address to be removed.
     * @param _threshold New threshold.
     */
    function removeOwner(address prevOwner, address owner, uint256 _threshold) public authorized {
        // Only allow to remove an owner, if threshold can still be reached.
        require(ownerCount - 1 >= _threshold, "GS201");
        // Validate owner address and check that it corresponds to owner index.
        require(owner != address(0) && owner != SENTINEL_OWNERS, "GS203");
        require(owners[prevOwner] == owner, "GS205");
        owners[prevOwner] = owners[owner];
        owners[owner] = address(0);
        ownerCount--;
        emit RemovedOwner(owner);
        // Change threshold if threshold was changed.
        if (threshold != _threshold) changeThreshold(_threshold);
    }
    /**
     * @notice Replaces the owner `oldOwner` in the Safe with `newOwner`.
     * @dev This can only be done via a Safe transaction.
     * @param prevOwner Owner that pointed to the owner to be replaced in the linked list
     * @param oldOwner Owner address to be replaced.
     * @param newOwner New owner address.
     */
    function swapOwner(address prevOwner, address oldOwner, address newOwner) public authorized {
        // Owner address cannot be null, the sentinel or the Safe itself.
        require(newOwner != address(0) && newOwner != SENTINEL_OWNERS && newOwner != address(this), "GS203");
        // No duplicate owners allowed.
        require(owners[newOwner] == address(0), "GS204");
        // Validate oldOwner address and check that it corresponds to owner index.
        require(oldOwner != address(0) && oldOwner != SENTINEL_OWNERS, "GS203");
        require(owners[prevOwner] == oldOwner, "GS205");
        owners[newOwner] = owners[oldOwner];
        owners[prevOwner] = newOwner;
        owners[oldOwner] = address(0);
        emit RemovedOwner(oldOwner);
        emit AddedOwner(newOwner);
    }
    /**
     * @notice Changes the threshold of the Safe to `_threshold`.
     * @dev This can only be done via a Safe transaction.
     * @param _threshold New threshold.
     */
    function changeThreshold(uint256 _threshold) public authorized {
        // Validate that threshold is smaller than number of owners.
        require(_threshold <= ownerCount, "GS201");
        // There has to be at least one Safe owner.
        require(_threshold >= 1, "GS202");
        threshold = _threshold;
        emit ChangedThreshold(threshold);
    }
    /**
     * @notice Returns the number of required confirmations for a Safe transaction aka the threshold.
     * @return Threshold number.
     */
    function getThreshold() public view returns (uint256) {
        return threshold;
    }
    /**
     * @notice Returns if `owner` is an owner of the Safe.
     * @return Boolean if owner is an owner of the Safe.
     */
    function isOwner(address owner) public view returns (bool) {
        return owner != SENTINEL_OWNERS && owners[owner] != address(0);
    }
    /**
     * @notice Returns a list of Safe owners.
     * @return Array of Safe owners.
     */
    function getOwners() public view returns (address[] memory) {
        address[] memory array = new address[](ownerCount);
        // populate return array
        uint256 index = 0;
        address currentOwner = owners[SENTINEL_OWNERS];
        while (currentOwner != SENTINEL_OWNERS) {
            array[index] = currentOwner;
            currentOwner = owners[currentOwner];
            index++;
        }
        return array;
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title Enum - Collection of enums used in Safe contracts.
 * @author Richard Meissner - @rmeissner
 */
abstract contract Enum {
    enum Operation {
        Call,
        DelegateCall
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title NativeCurrencyPaymentFallback - A contract that has a fallback to accept native currency payments.
 * @author Richard Meissner - @rmeissner
 */
abstract contract NativeCurrencyPaymentFallback {
    event SafeReceived(address indexed sender, uint256 value);
    /**
     * @notice Receive function accepts native currency transactions.
     * @dev Emits an event with sender and received value.
     */
    receive() external payable {
        emit SafeReceived(msg.sender, msg.value);
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title SecuredTokenTransfer - Secure token transfer.
 * @author Richard Meissner - @rmeissner
 */
abstract contract SecuredTokenTransfer {
    /**
     * @notice Transfers a token and returns a boolean if it was a success
     * @dev It checks the return data of the transfer call and returns true if the transfer was successful.
     *      It doesn't check if the `token` address is a contract or not.
     * @param token Token that should be transferred
     * @param receiver Receiver to whom the token should be transferred
     * @param amount The amount of tokens that should be transferred
     * @return transferred Returns true if the transfer was successful
     */
    function transferToken(address token, address receiver, uint256 amount) internal returns (bool transferred) {
        // 0xa9059cbb - keccack("transfer(address,uint256)")
        bytes memory data = abi.encodeWithSelector(0xa9059cbb, receiver, amount);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // We write the return value to scratch space.
            // See https://docs.soliditylang.org/en/v0.7.6/internals/layout_in_memory.html#layout-in-memory
            let success := call(sub(gas(), 10000), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            switch returndatasize()
            case 0 {
                transferred := success
            }
            case 0x20 {
                transferred := iszero(or(iszero(success), iszero(mload(0))))
            }
            default {
                transferred := 0
            }
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title SelfAuthorized - Authorizes current contract to perform actions to itself.
 * @author Richard Meissner - @rmeissner
 */
abstract contract SelfAuthorized {
    function requireSelfCall() private view {
        require(msg.sender == address(this), "GS031");
    }
    modifier authorized() {
        // Modifiers are copied around during compilation. This is a function call as it minimized the bytecode size
        requireSelfCall();
        _;
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title SignatureDecoder - Decodes signatures encoded as bytes
 * @author Richard Meissner - @rmeissner
 */
abstract contract SignatureDecoder {
    /**
     * @notice Splits signature bytes into `uint8 v, bytes32 r, bytes32 s`.
     * @dev Make sure to perform a bounds check for @param pos, to avoid out of bounds access on @param signatures
     *      The signature format is a compact form of {bytes32 r}{bytes32 s}{uint8 v}
     *      Compact means uint8 is not padded to 32 bytes.
     * @param pos Which signature to read.
     *            A prior bounds check of this parameter should be performed, to avoid out of bounds access.
     * @param signatures Concatenated {r, s, v} signatures.
     * @return v Recovery ID or Safe signature type.
     * @return r Output value r of the signature.
     * @return s Output value s of the signature.
     */
    function signatureSplit(bytes memory signatures, uint256 pos) internal pure returns (uint8 v, bytes32 r, bytes32 s) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let signaturePos := mul(0x41, pos)
            r := mload(add(signatures, add(signaturePos, 0x20)))
            s := mload(add(signatures, add(signaturePos, 0x40)))
            /**
             * Here we are loading the last 32 bytes, including 31 bytes
             * of 's'. There is no 'mload8' to do this.
             * 'byte' is not working due to the Solidity parser, so lets
             * use the second best option, 'and'
             */
            v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title Singleton - Base for singleton contracts (should always be the first super contract)
 *        This contract is tightly coupled to our proxy contract (see `proxies/SafeProxy.sol`)
 * @author Richard Meissner - @rmeissner
 */
abstract contract Singleton {
    // singleton always has to be the first declared variable to ensure the same location as in the Proxy contract.
    // It should also always be ensured the address is stored alone (uses a full word)
    address private singleton;
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title StorageAccessible - A generic base contract that allows callers to access all internal storage.
 * @notice See https://github.com/gnosis/util-contracts/blob/bb5fe5fb5df6d8400998094fb1b32a178a47c3a1/contracts/StorageAccessible.sol
 *         It removes a method from the original contract not needed for the Safe contracts.
 * @author Gnosis Developers
 */
abstract contract StorageAccessible {
    /**
     * @notice Reads `length` bytes of storage in the currents contract
     * @param offset - the offset in the current contract's storage in words to start reading from
     * @param length - the number of words (32 bytes) of data to read
     * @return the bytes that were read.
     */
    function getStorageAt(uint256 offset, uint256 length) public view returns (bytes memory) {
        bytes memory result = new bytes(length * 32);
        for (uint256 index = 0; index < length; index++) {
            // solhint-disable-next-line no-inline-assembly
            assembly {
                let word := sload(add(offset, index))
                mstore(add(add(result, 0x20), mul(index, 0x20)), word)
            }
        }
        return result;
    }
    /**
     * @dev Performs a delegatecall on a targetContract in the context of self.
     * Internally reverts execution to avoid side effects (making it static).
     *
     * This method reverts with data equal to `abi.encode(bool(success), bytes(response))`.
     * Specifically, the `returndata` after a call to this method will be:
     * `success:bool || response.length:uint256 || response:bytes`.
     *
     * @param targetContract Address of the contract containing the code to execute.
     * @param calldataPayload Calldata that should be sent to the target contract (encoded method name and arguments).
     */
    function simulateAndRevert(address targetContract, bytes memory calldataPayload) external {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let success := delegatecall(gas(), targetContract, add(calldataPayload, 0x20), mload(calldataPayload), 0, 0)
            mstore(0x00, success)
            mstore(0x20, returndatasize())
            returndatacopy(0x40, 0, returndatasize())
            revert(0, add(returndatasize(), 0x40))
        }
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
 * @title SafeMath
 * @notice Math operations with safety checks that revert on error (overflow/underflow)
 */
library SafeMath {
    /**
     * @notice Multiplies two numbers, reverts on overflow.
     * @param a First number
     * @param b Second number
     * @return Product of a and b
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b);
        return c;
    }
    /**
     * @notice Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     * @param a First number
     * @param b Second number
     * @return Difference of a and b
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;
        return c;
    }
    /**
     * @notice Adds two numbers, reverts on overflow.
     * @param a First number
     * @param b Second number
     * @return Sum of a and b
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);
        return c;
    }
    /**
     * @notice Returns the largest of two numbers.
     * @param a First number
     * @param b Second number
     * @return Largest of a and b
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/// @notice More details at https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/introspection/IERC165.sol
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by `interfaceId`.
     * See the corresponding EIP section
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
contract ISignatureValidatorConstants {
    // bytes4(keccak256("isValidSignature(bytes,bytes)")
    bytes4 internal constant EIP1271_MAGIC_VALUE = 0x20c13b0b;
}
abstract contract ISignatureValidator is ISignatureValidatorConstants {
    /**
     * @notice Legacy EIP1271 method to validate a signature.
     * @param _data Arbitrary length data signed on the behalf of address(this).
     * @param _signature Signature byte array associated with _data.
     *
     * MUST return the bytes4 magic value 0x20c13b0b when function passes.
     * MUST NOT modify state (using STATICCALL for solc < 0.5, view modifier for solc > 0.5)
     * MUST allow external calls
     */
    function isValidSignature(bytes memory _data, bytes memory _signature) public view virtual returns (bytes4);
}