// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @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 internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        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 virtual view 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 {
        _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 () payable external {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _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 {
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "./Proxy.sol";
import "../utils/Address.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.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @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));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @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 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }
    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }
    /**
     * @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");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }
    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../openzeppelin/proxy/UpgradeableProxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative inerface of your proxy.
 */
contract OptimizedTransparentUpgradeableProxy is UpgradeableProxy {
    address internal immutable _ADMIN;
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(
        address initialLogic,
        address initialAdmin,
        bytes memory _data
    ) payable UpgradeableProxy(initialLogic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        bytes32 slot = _ADMIN_SLOT;
        _ADMIN = initialAdmin;
        // still store it to work with EIP-1967
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, initialAdmin)
        }
    }
    /**
     * @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 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = newImplementation.delegatecall(data);
        require(success);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        return _ADMIN;
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

{"Address.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor execution.\n\n        uint256 size;\n        // solhint-disable-next-line no-inline-assembly\n        assembly { size := extcodesize(account) }\n        return size \u003e 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance \u003e= amount, \"Address: insufficient balance\");\n\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n        (bool success, ) = recipient.call{ value: amount }(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain`call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n      return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n        require(address(this).balance \u003e= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.call{ value: value }(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length \u003e 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                // solhint-disable-next-line no-inline-assembly\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"},"Buffer.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\n// https://github.com/ensdomains/buffer\n\npragma solidity ^0.7.0;\n\n/**\n * @dev A library for working with mutable byte buffers in Solidity.\n *\n * Byte buffers are mutable and expandable, and provide a variety of primitives\n * for writing to them. At any time you can fetch a bytes object containing the\n * current contents of the buffer. The bytes object should not be stored between\n * operations, as it may change due to resizing of the buffer.\n */\nlibrary Buffer {\n    /**\n     * @dev Represents a mutable buffer. Buffers have a current value (buf) and\n     *      a capacity. The capacity may be longer than the current value, in\n     *      which case it can be extended without the need to allocate more memory.\n     */\n    struct buffer {\n        bytes buf;\n        uint capacity;\n    }\n\n    /**\n     * @dev Initializes a buffer with an initial capacity.a co\n     * @param buf The buffer to initialize.\n     * @param capacity The number of bytes of space to allocate the buffer.\n     * @return The buffer, for chaining.\n     */\n    function init(buffer memory buf, uint capacity) internal pure returns (buffer memory) {\n        if (capacity % 32 != 0) {\n            capacity += 32 - (capacity % 32);\n        }\n        // Allocate space for the buffer data\n        buf.capacity = capacity;\n        assembly {\n            let ptr := mload(0x40)\n            mstore(buf, ptr)\n            mstore(ptr, 0)\n            mstore(0x40, add(32, add(ptr, capacity)))\n        }\n        return buf;\n    }\n\n\n    /**\n     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed\n     *      the capacity of the buffer.\n     * @param buf The buffer to append to.\n     * @param off The start offset to write to.\n     * @param rawData The data to append.\n     * @param len The number of bytes to copy.\n     * @return The original buffer, for chaining.\n     */\n    function writeRawBytes(\n        buffer memory buf,\n        uint off,\n        bytes memory rawData,\n        uint offData,\n        uint len\n    ) internal pure returns (buffer memory) {\n        if (off + len \u003e buf.capacity) {\n            resize(buf, max(buf.capacity, len + off) * 2);\n        }\n\n        uint dest;\n        uint src;\n        assembly {\n            // Memory address of the buffer data\n            let bufptr := mload(buf)\n            // Length of existing buffer data\n            let buflen := mload(bufptr)\n            // Start address = buffer address + offset + sizeof(buffer length)\n            dest := add(add(bufptr, 32), off)\n            // Update buffer length if we\u0027re extending it\n            if gt(add(len, off), buflen) {\n                mstore(bufptr, add(len, off))\n            }\n            src := add(rawData, offData)\n        }\n\n        // Copy word-length chunks while possible\n        for (; len \u003e= 32; len -= 32) {\n            assembly {\n                mstore(dest, mload(src))\n            }\n            dest += 32;\n            src += 32;\n        }\n\n        // Copy remaining bytes\n        uint mask = 256**(32 - len) - 1;\n        assembly {\n            let srcpart := and(mload(src), not(mask))\n            let destpart := and(mload(dest), mask)\n            mstore(dest, or(destpart, srcpart))\n        }\n\n        return buf;\n    }\n\n    /**\n     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed\n     *      the capacity of the buffer.\n     * @param buf The buffer to append to.\n     * @param off The start offset to write to.\n     * @param data The data to append.\n     * @param len The number of bytes to copy.\n     * @return The original buffer, for chaining.\n     */\n    function write(buffer memory buf, uint off, bytes memory data, uint len) internal pure returns (buffer memory) {\n        require(len \u003c= data.length);\n\n        if (off + len \u003e buf.capacity) {\n            resize(buf, max(buf.capacity, len + off) * 2);\n        }\n\n        uint dest;\n        uint src;\n        assembly {\n        // Memory address of the buffer data\n            let bufptr := mload(buf)\n        // Length of existing buffer data\n            let buflen := mload(bufptr)\n        // Start address = buffer address + offset + sizeof(buffer length)\n            dest := add(add(bufptr, 32), off)\n        // Update buffer length if we\u0027re extending it\n            if gt(add(len, off), buflen) {\n                mstore(bufptr, add(len, off))\n            }\n            src := add(data, 32)\n        }\n\n        // Copy word-length chunks while possible\n        for (; len \u003e= 32; len -= 32) {\n            assembly {\n                mstore(dest, mload(src))\n            }\n            dest += 32;\n            src += 32;\n        }\n\n        // Copy remaining bytes\n        uint mask = 256**(32 - len) - 1;\n        assembly {\n            let srcpart := and(mload(src), not(mask))\n            let destpart := and(mload(dest), mask)\n            mstore(dest, or(destpart, srcpart))\n        }\n\n        return buf;\n    }\n\n    function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) {\n        return write(buf, buf.buf.length, data, data.length);\n    }\n\n    function resize(buffer memory buf, uint capacity) private pure {\n        bytes memory oldbuf = buf.buf;\n        init(buf, capacity);\n        append(buf, oldbuf);\n    }\n\n    function max(uint a, uint b) private pure returns (uint) {\n        if (a \u003e b) {\n            return a;\n        }\n        return b;\n    }\n}\n"},"Context.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity \u003e=0.6.0 \u003c0.8.0;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address payable) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes memory) {\n        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n        return msg.data;\n    }\n}\n"},"IERC20.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller\u0027s account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller\u0027s tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender\u0027s allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller\u0027s\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},"ILayerZeroEndpoint.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\n\ninterface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {\n    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.\n    // @param _dstChainId - the destination chain identifier\n    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains\n    // @param _payload - a custom bytes payload to send to the destination contract\n    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address\n    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction\n    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination\n    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;\n\n    // @notice used by the messaging library to publish verified payload\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source contract (as bytes) at the source chain\n    // @param _dstAddress - the address on destination chain\n    // @param _nonce - the unbound message ordering nonce\n    // @param _gasLimit - the gas limit for external contract execution\n    // @param _payload - verified payload to send to the destination contract\n    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;\n\n    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);\n\n    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM\n    // @param _srcAddress - the source chain contract address\n    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);\n\n    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery\n    // @param _dstChainId - the destination chain identifier\n    // @param _userApplication - the user app address on this EVM chain\n    // @param _payload - the custom message to send over LayerZero\n    // @param _payInZRO - if false, user app pays the protocol fee in native token\n    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain\n    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);\n\n    // @notice get this Endpoint\u0027s immutable source identifier\n    function getChainId() external view returns (uint16);\n\n    // @notice the interface to retry failed message on this Endpoint destination\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    // @param _payload - the payload to be retried\n    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;\n\n    // @notice query if any STORED payload (message blocking) at the endpoint.\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);\n\n    // @notice query if the _libraryAddress is valid for sending msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getSendLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the _libraryAddress is valid for receiving msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getReceiveLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the non-reentrancy guard for send() is on\n    // @return true if the guard is on. false otherwise\n    function isSendingPayload() external view returns (bool);\n\n    // @notice query if the non-reentrancy guard for receive() is on\n    // @return true if the guard is on. false otherwise\n    function isReceivingPayload() external view returns (bool);\n\n    // @notice get the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _userApplication - the contract address of the user application\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);\n\n    // @notice get the send() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getSendVersion(address _userApplication) external view returns (uint16);\n\n    // @notice get the lzReceive() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getReceiveVersion(address _userApplication) external view returns (uint16);\n}\n"},"ILayerZeroMessagingLibrary.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\n\ninterface ILayerZeroMessagingLibrary {\n    // send(), messages will be inflight.\n    function send(address _userApplication, uint64 _lastNonce, uint16 _chainId, bytes calldata _destination, bytes calldata _payload, address payable refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;\n\n    // estimate native fee at the send side\n    function estimateFees(uint16 _chainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);\n\n    //---------------------------------------------------------------------------\n    // setConfig / getConfig are User Application (UA) functions to specify Oracle, Relayer, blockConfirmations, libraryVersion\n    function setConfig(uint16 _chainId, address _userApplication, uint _configType, bytes calldata _config) external;\n\n    function getConfig(uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);\n}\n"},"ILayerZeroMessagingLibraryV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\nimport \"./ILayerZeroMessagingLibrary.sol\";\n\ninterface ILayerZeroMessagingLibraryV2 is ILayerZeroMessagingLibrary {\n    function getOutboundNonce(uint16 _chainId, bytes calldata _path) external view returns (uint64);\n}\n"},"ILayerZeroOracleV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\ninterface ILayerZeroOracleV2 {\n    // @notice query price and assign jobs at the same time\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _outboundBlockConfirmation - block confirmation delay before relaying blocks\n    // @param _userApplication - the source sending contract address\n    function assignJob(uint16 _dstChainId, uint16 _outboundProofType, uint64 _outboundBlockConfirmation, address _userApplication) external returns (uint price);\n\n    // @notice query the oracle price for relaying block information to the destination chain\n    // @param _dstChainId the destination endpoint identifier\n    // @param _outboundProofType the proof type identifier to specify the data to be relayed\n    // @param _outboundBlockConfirmation - block confirmation delay before relaying blocks\n    // @param _userApplication - the source sending contract address\n    function getFee(uint16 _dstChainId, uint16 _outboundProofType, uint64 _outboundBlockConfirmation, address _userApplication) external view returns (uint price);\n\n    // @notice withdraw the accrued fee in ultra light node\n    // @param _to - the fee receiver\n    // @param _amount - the withdrawal amount\n    function withdrawFee(address payable _to, uint _amount) external;\n}\n"},"ILayerZeroReceiver.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroReceiver {\n    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination\n    // @param _srcChainId - the source endpoint identifier\n    // @param _srcAddress - the source sending contract address from the source chain\n    // @param _nonce - the ordered message nonce\n    // @param _payload - the signed payload is the UA bytes has encoded to be sent\n    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;\n}\n"},"ILayerZeroRelayerV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\ninterface ILayerZeroRelayerV2 {\n    // @notice query price and assign jobs at the same time\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _userApplication - the source sending contract address. relayers may apply price discrimination to user apps\n    // @param _payloadSize - the length of the payload. it is an indicator of gas usage for relaying cross-chain messages\n    // @param _adapterParams - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain\n    function assignJob(uint16 _dstChainId, uint16 _outboundProofType, address _userApplication, uint _payloadSize, bytes calldata _adapterParams) external returns (uint price);\n\n    // @notice query the relayer price for relaying the payload and its proof to the destination chain\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _userApplication - the source sending contract address. relayers may apply price discrimination to user apps\n    // @param _payloadSize - the length of the payload. it is an indicator of gas usage for relaying cross-chain messages\n    // @param _adapterParams - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain\n    function getFee(uint16 _dstChainId, uint16 _outboundProofType, address _userApplication, uint _payloadSize, bytes calldata _adapterParams) external view returns (uint price);\n\n    // @notice withdraw the accrued fee in ultra light node\n    // @param _to - the fee receiver\n    // @param _amount - the withdrawal amount\n    function withdrawFee(address payable _to, uint _amount) external;\n}\n"},"ILayerZeroTreasury.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroTreasury {\n    function getFees(bool payInZro, uint relayerFee, uint oracleFee) external view returns (uint);\n}\n"},"ILayerZeroUltraLightNodeV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\npragma abicoder v2;\n\ninterface ILayerZeroUltraLightNodeV2 {\n    // Relayer functions\n    function validateTransactionProof(uint16 _srcChainId, address _dstAddress, uint _gasLimit, bytes32 _lookupHash, bytes32 _blockData, bytes calldata _transactionProof) external;\n\n    // an Oracle delivers the block data using updateHash()\n    function updateHash(uint16 _srcChainId, bytes32 _lookupHash, uint _confirmations, bytes32 _blockData) external;\n\n    // can only withdraw the receivable of the msg.sender\n    function withdrawNative(address payable _to, uint _amount) external;\n\n    function withdrawZRO(address _to, uint _amount) external;\n\n    // view functions\n    function getAppConfig(uint16 _remoteChainId, address _userApplicationAddress) external view returns (ApplicationConfiguration memory);\n\n    function accruedNativeFee(address _address) external view returns (uint);\n\n    struct ApplicationConfiguration {\n        uint16 inboundProofLibraryVersion;\n        uint64 inboundBlockConfirmations;\n        address relayer;\n        uint16 outboundProofType;\n        uint64 outboundBlockConfirmations;\n        address oracle;\n    }\n\n    event HashReceived(uint16 indexed srcChainId, address indexed oracle, bytes32 lookupHash, bytes32 blockData, uint confirmations);\n    event RelayerParams(bytes adapterParams, uint16 outboundProofType);\n    event Packet(bytes payload);\n    event InvalidDst(uint16 indexed srcChainId, bytes srcAddress, address indexed dstAddress, uint64 nonce, bytes32 payloadHash);\n    event PacketReceived(uint16 indexed srcChainId, bytes srcAddress, address indexed dstAddress, uint64 nonce, bytes32 payloadHash);\n    event AppConfigUpdated(address indexed userApplication, uint indexed configType, bytes newConfig);\n    event AddInboundProofLibraryForChain(uint16 indexed chainId, address lib);\n    event EnableSupportedOutboundProof(uint16 indexed chainId, uint16 proofType);\n    event SetChainAddressSize(uint16 indexed chainId, uint size);\n    event SetDefaultConfigForChainId(uint16 indexed chainId, uint16 inboundProofLib, uint64 inboundBlockConfirm, address relayer, uint16 outboundProofType, uint64 outboundBlockConfirm, address oracle);\n    event SetDefaultAdapterParamsForChainId(uint16 indexed chainId, uint16 indexed proofType, bytes adapterParams);\n    event SetLayerZeroToken(address indexed tokenAddress);\n    event SetRemoteUln(uint16 indexed chainId, bytes32 uln);\n    event SetTreasury(address indexed treasuryAddress);\n    event WithdrawZRO(address indexed msgSender, address indexed to, uint amount);\n    event WithdrawNative(address indexed msgSender, address indexed to, uint amount);\n}\n"},"ILayerZeroUserApplicationConfig.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroUserApplicationConfig {\n    // @notice set the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    // @param _config - configuration in the bytes. can encode arbitrary content.\n    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;\n\n    // @notice set the send() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setSendVersion(uint16 _version) external;\n\n    // @notice set the lzReceive() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setReceiveVersion(uint16 _version) external;\n\n    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload\n    // @param _srcChainId - the chainId of the source chain\n    // @param _srcAddress - the contract address of the source contract at the source chain\n    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;\n}\n"},"ILayerZeroValidationLibrary.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\npragma abicoder v2;\n\nimport \"./LayerZeroPacket.sol\";\n\ninterface ILayerZeroValidationLibrary {\n    function validateProof(bytes32 blockData, bytes calldata _data, uint _remoteAddressSize) external returns (LayerZeroPacket.Packet memory packet);\n}\n"},"LayerZeroPacket.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\n\nimport \"./Buffer.sol\";\nimport \"./SafeMath.sol\";\n\nlibrary LayerZeroPacket {\n    using Buffer for Buffer.buffer;\n    using SafeMath for uint;\n\n    struct Packet {\n        uint16 srcChainId;\n        uint16 dstChainId;\n        uint64 nonce;\n        address dstAddress;\n        bytes srcAddress;\n        bytes32 ulnAddress;\n        bytes payload;\n    }\n\n    function getPacket(\n        bytes memory data,\n        uint16 srcChain,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        uint16 dstChainId;\n        address dstAddress;\n        uint size;\n        uint64 nonce;\n\n        // The log consists of the destination chain id and then a bytes payload\n        //      0--------------------------------------------31\n        // 0   |  total bytes size\n        // 32  |  destination chain id\n        // 64  |  bytes offset\n        // 96  |  bytes array size\n        // 128 |  payload\n        assembly {\n            dstChainId := mload(add(data, 32))\n            size := mload(add(data, 96)) /// size of the byte array\n            nonce := mload(add(data, 104)) // offset to convert to uint64  128  is index -24\n            dstAddress := mload(add(data, sub(add(128, sizeOfSrcAddress), 4))) // offset to convert to address 12 -8\n        }\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 136, sizeOfSrcAddress); // 128 + 8\n\n        uint payloadSize = size.sub(28).sub(sizeOfSrcAddress);\n        Buffer.buffer memory payloadBuffer;\n        payloadBuffer.init(payloadSize);\n        payloadBuffer.writeRawBytes(0, data, sizeOfSrcAddress.add(156), payloadSize); // 148 + 8\n        return LayerZeroPacket.Packet(srcChain, dstChainId, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n\n    function getPacketV2(\n        bytes memory data,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        // packet def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);\n        // data def: abi.encode(packet) = offset(32) + length(32) + packet\n        //              if from EVM\n        // 0 - 31       0 - 31          |  total bytes size\n        // 32 - 63      32 - 63         |  location\n        // 64 - 95      64 - 95         |  size of the packet\n        // 96 - 103     96 - 103        |  nonce\n        // 104 - 105    104 - 105       |  srcChainId\n        // 106 - P      106 - 125       |  srcAddress, where P = 106 + sizeOfSrcAddress - 1,\n        // P+1 - P+2    126 - 127       |  dstChainId\n        // P+3 - P+22   128 - 147       |  dstAddress\n        // P+23 - END   148 - END       |  payload\n\n        // decode the packet\n        uint256 realSize;\n        uint64 nonce;\n        uint16 srcChain;\n        uint16 dstChain;\n        address dstAddress;\n        assembly {\n            realSize := mload(add(data, 64))\n            nonce := mload(add(data, 72)) // 104 - 32\n            srcChain := mload(add(data, 74)) // 106 - 32\n            dstChain := mload(add(data, add(76, sizeOfSrcAddress))) // P + 3 - 32 = 105 + size + 3 - 32 = 76 + size\n            dstAddress := mload(add(data, add(96, sizeOfSrcAddress))) // P + 23 - 32 = 105 + size + 23 - 32 = 96 + size\n        }\n\n        require(srcChain != 0, \"LayerZeroPacket: invalid packet\");\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 106, sizeOfSrcAddress);\n\n        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20\n        uint payloadSize = realSize.sub(nonPayloadSize);\n        Buffer.buffer memory payloadBuffer;\n        payloadBuffer.init(payloadSize);\n        payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(96), payloadSize);\n\n        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n\n    function getPacketV3(\n        bytes memory data,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        // data def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);\n        //              if from EVM\n        // 0 - 31       0 - 31          |  total bytes size\n        // 32 - 39      32 - 39         |  nonce\n        // 40 - 41      40 - 41         |  srcChainId\n        // 42 - P       42 - 61         |  srcAddress, where P = 41 + sizeOfSrcAddress,\n        // P+1 - P+2    62 - 63         |  dstChainId\n        // P+3 - P+22   64 - 83         |  dstAddress\n        // P+23 - END   84 - END        |  payload\n\n        // decode the packet\n        uint256 realSize = data.length;\n        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20\n        require(realSize \u003e= nonPayloadSize, \"LayerZeroPacket: invalid packet\");\n        uint payloadSize = realSize - nonPayloadSize;\n\n        uint64 nonce;\n        uint16 srcChain;\n        uint16 dstChain;\n        address dstAddress;\n        assembly {\n            nonce := mload(add(data, 8)) // 40 - 32\n            srcChain := mload(add(data, 10)) // 42 - 32\n            dstChain := mload(add(data, add(12, sizeOfSrcAddress))) // P + 3 - 32 = 41 + size + 3 - 32 = 12 + size\n            dstAddress := mload(add(data, add(32, sizeOfSrcAddress))) // P + 23 - 32 = 41 + size + 23 - 32 = 32 + size\n        }\n\n        require(srcChain != 0, \"LayerZeroPacket: invalid packet\");\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 42, sizeOfSrcAddress);\n\n        Buffer.buffer memory payloadBuffer;\n        if (payloadSize \u003e 0) {\n            payloadBuffer.init(payloadSize);\n            payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(32), payloadSize);\n        }\n\n        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n}\n"},"NonceContract.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\n\nimport \"./ILayerZeroEndpoint.sol\";\n\ncontract NonceContract {\n    ILayerZeroEndpoint public immutable endpoint;\n    // outboundNonce = [dstChainId][remoteAddress + localAddress]\n    mapping(uint16 =\u003e mapping(bytes =\u003e uint64)) public outboundNonce;\n\n    constructor(address _endpoint) {\n        endpoint = ILayerZeroEndpoint(_endpoint);\n    }\n\n    function increment(uint16 _chainId, address _ua, bytes calldata _path) external returns (uint64) {\n        require(endpoint.getSendLibraryAddress(_ua) == msg.sender, \"NonceContract: msg.sender is not valid sendlibrary\");\n        return ++outboundNonce[_chainId][_path];\n    }\n}\n"},"Ownable.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./Context.sol\";\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor () {\n        address msgSender = _msgSender();\n        _owner = msgSender;\n        emit OwnershipTransferred(address(0), msgSender);\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n        _;\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        emit OwnershipTransferred(_owner, address(0));\n        _owner = address(0);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        emit OwnershipTransferred(_owner, newOwner);\n        _owner = newOwner;\n    }\n}\n"},"ReentrancyGuard.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot\u0027s contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler\u0027s defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction\u0027s gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    constructor () {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and make it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        // On the first call to nonReentrant, _notEntered will be true\n        require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n\n        _;\n\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n}\n"},"SafeERC20.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./IERC20.sol\";\nimport \"./SafeMath.sol\";\nimport \"./Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    using SafeMath for uint256;\n    using Address for address;\n\n    function safeTransfer(IERC20 token, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Deprecated. This function has issues similar to the ones found in\n     * {IERC20-approve}, and its usage is discouraged.\n     *\n     * Whenever possible, use {safeIncreaseAllowance} and\n     * {safeDecreaseAllowance} instead.\n     */\n    function safeApprove(IERC20 token, address spender, uint256 value) internal {\n        // safeApprove should only be called when setting an initial allowance,\n        // or when resetting it to zero. To increase and decrease it, use\n        // \u0027safeIncreaseAllowance\u0027 and \u0027safeDecreaseAllowance\u0027\n        // solhint-disable-next-line max-line-length\n        require((value == 0) || (token.allowance(address(this), spender) == 0),\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\n        );\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n    }\n\n    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).add(value);\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).sub(value, \"SafeERC20: decreased allowance below zero\");\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     * @param token The token targeted by the call.\n     * @param data The call data (encoded using abi.encode or one of its variants).\n     */\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity\u0027s return data size checking mechanism, since\n        // we\u0027re implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n        // the target address contains contract code and also asserts for success in the low-level call.\n\n        bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n        if (returndata.length \u003e 0) { // Return data is optional\n            // solhint-disable-next-line max-line-length\n            require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n        }\n    }\n}\n"},"SafeMath.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it\u0027s recommended to use it always.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        uint256 c = a + b;\n        if (c \u003c a) return (false, 0);\n        return (true, c);\n    }\n\n    /**\n     * @dev Returns the substraction of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b \u003e a) return (false, 0);\n        return (true, a - b);\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\n        // benefit is lost if \u0027b\u0027 is also tested.\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n        if (a == 0) return (true, 0);\n        uint256 c = a * b;\n        if (c / a != b) return (false, 0);\n        return (true, c);\n    }\n\n    /**\n     * @dev Returns the division of two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b == 0) return (false, 0);\n        return (true, a / b);\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b == 0) return (false, 0);\n        return (true, a % b);\n    }\n\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        require(c \u003e= a, \"SafeMath: addition overflow\");\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003c= a, \"SafeMath: subtraction overflow\");\n        return a - b;\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `*` operator.\n     *\n     * Requirements:\n     *\n     * - Multiplication cannot overflow.\n     */\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        if (a == 0) return 0;\n        uint256 c = a * b;\n        require(c / a == b, \"SafeMath: multiplication overflow\");\n        return c;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003e 0, \"SafeMath: division by zero\");\n        return a / b;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003e 0, \"SafeMath: modulo by zero\");\n        return a % b;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {trySub}.\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003c= a, errorMessage);\n        return a - b;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting with custom message on\n     * division by zero. The result is rounded towards zero.\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {tryDiv}.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        return a / b;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting with custom message when dividing by zero.\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {tryMod}.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        return a % b;\n    }\n}\n"},"UltraLightNodeV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\npragma abicoder v2;\n\nimport \"./Ownable.sol\";\nimport \"./SafeMath.sol\";\nimport \"./ReentrancyGuard.sol\";\nimport \"./IERC20.sol\";\nimport \"./SafeERC20.sol\";\n\nimport \"./ILayerZeroValidationLibrary.sol\";\nimport \"./ILayerZeroReceiver.sol\";\nimport \"./ILayerZeroTreasury.sol\";\nimport \"./ILayerZeroEndpoint.sol\";\n// v2\nimport \"./ILayerZeroMessagingLibraryV2.sol\";\nimport \"./ILayerZeroOracleV2.sol\";\nimport \"./ILayerZeroUltraLightNodeV2.sol\";\nimport \"./ILayerZeroRelayerV2.sol\";\nimport \"./NonceContract.sol\";\n\ncontract UltraLightNodeV2 is ILayerZeroMessagingLibraryV2, ILayerZeroUltraLightNodeV2, ReentrancyGuard, Ownable {\n    using SafeERC20 for IERC20;\n    using SafeMath for uint;\n\n    // Application config\n    uint public constant CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION = 1;\n    uint public constant CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS = 2;\n    uint public constant CONFIG_TYPE_RELAYER = 3;\n    uint public constant CONFIG_TYPE_OUTBOUND_PROOF_TYPE = 4;\n    uint public constant CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS = 5;\n    uint public constant CONFIG_TYPE_ORACLE = 6;\n\n    // Token and Contracts\n    IERC20 public layerZeroToken;\n    ILayerZeroTreasury public treasuryContract;\n\n    mapping(address =\u003e uint) public nativeFees;\n    uint public treasuryZROFees;\n\n    // User Application\n    mapping(address =\u003e mapping(uint16 =\u003e ApplicationConfiguration)) public appConfig; // app address =\u003e chainId =\u003e config\n    mapping(uint16 =\u003e ApplicationConfiguration) public defaultAppConfig; // default UA settings if no version specified\n    mapping(uint16 =\u003e mapping(uint16 =\u003e bytes)) public defaultAdapterParams;\n\n    // Validation\n    mapping(uint16 =\u003e mapping(uint16 =\u003e address)) public inboundProofLibrary; // chainId =\u003e library Id =\u003e inboundProofLibrary contract\n    mapping(uint16 =\u003e uint16) public maxInboundProofLibrary; // chainId =\u003e inboundProofLibrary\n    mapping(uint16 =\u003e mapping(uint16 =\u003e bool)) public supportedOutboundProof; // chainId =\u003e outboundProofType =\u003e enabled\n    mapping(uint16 =\u003e uint) public chainAddressSizeMap;\n    mapping(address =\u003e mapping(uint16 =\u003e mapping(bytes32 =\u003e mapping(bytes32 =\u003e uint)))) public hashLookup; //[oracle][srcChainId][blockhash][datahash] -\u003e confirmation\n    mapping(uint16 =\u003e bytes32) public ulnLookup; // remote ulns\n\n    ILayerZeroEndpoint public immutable endpoint;\n    uint16 public immutable localChainId;\n    NonceContract public immutable nonceContract;\n\n    constructor(address _endpoint, address _nonceContract, uint16 _localChainId) {\n        require(_endpoint != address(0x0), \"LayerZero: endpoint cannot be zero address\");\n        require(_nonceContract != address(0x0), \"LayerZero: nonceContract cannot be zero address\");\n        ILayerZeroEndpoint lzEndpoint = ILayerZeroEndpoint(_endpoint);\n        localChainId = _localChainId;\n        endpoint = lzEndpoint;\n        nonceContract = NonceContract(_nonceContract);\n    }\n\n    // only the endpoint can call SEND() and setConfig()\n    modifier onlyEndpoint() {\n        require(address(endpoint) == msg.sender, \"LayerZero: only endpoint\");\n        _;\n    }\n\n    //----------------------------------------------------------------------------------\n    // PROTOCOL\n    function validateTransactionProof(uint16 _srcChainId, address _dstAddress, uint _gasLimit, bytes32 _lookupHash, bytes32 _blockData, bytes calldata _transactionProof) external override {\n        // retrieve UA\u0027s configuration using the _dstAddress from arguments.\n        ApplicationConfiguration memory uaConfig = _getAppConfig(_srcChainId, _dstAddress);\n\n        // assert that the caller == UA\u0027s relayer\n        require(uaConfig.relayer == msg.sender, \"LayerZero: invalid relayer\");\n\n        LayerZeroPacket.Packet memory _packet;\n        uint remoteAddressSize = chainAddressSizeMap[_srcChainId];\n        require(remoteAddressSize != 0, \"LayerZero: incorrect remote address size\");\n        {\n            // assert that the data submitted by UA\u0027s oracle have no fewer confirmations than UA\u0027s configuration\n            uint storedConfirmations = hashLookup[uaConfig.oracle][_srcChainId][_lookupHash][_blockData];\n            require(storedConfirmations \u003e 0 \u0026\u0026 storedConfirmations \u003e= uaConfig.inboundBlockConfirmations, \"LayerZero: not enough block confirmations\");\n\n            // decode\n            address inboundProofLib = inboundProofLibrary[_srcChainId][uaConfig.inboundProofLibraryVersion];\n            _packet = ILayerZeroValidationLibrary(inboundProofLib).validateProof(_blockData, _transactionProof, remoteAddressSize);\n        }\n\n        // packet content assertion\n        require(ulnLookup[_srcChainId] == _packet.ulnAddress \u0026\u0026 _packet.ulnAddress != bytes32(0), \"LayerZero: invalid _packet.ulnAddress\");\n        require(_packet.srcChainId == _srcChainId, \"LayerZero: invalid srcChain Id\");\n        // failsafe because the remoteAddress size being passed into validateProof trims the address this should not hit\n        require(_packet.srcAddress.length == remoteAddressSize, \"LayerZero: invalid srcAddress size\");\n        require(_packet.dstChainId == localChainId, \"LayerZero: invalid dstChain Id\");\n        require(_packet.dstAddress == _dstAddress, \"LayerZero: invalid dstAddress\");\n\n        // if the dst is not a contract, then emit and return early. This will break inbound nonces, but this particular\n        // path is already broken and wont ever be able to deliver anyways\n        if (!_isContract(_dstAddress)) {\n            emit InvalidDst(_packet.srcChainId, _packet.srcAddress, _packet.dstAddress, _packet.nonce, keccak256(_packet.payload));\n            return;\n        }\n\n        bytes memory pathData = abi.encodePacked(_packet.srcAddress, _packet.dstAddress);\n        emit PacketReceived(_packet.srcChainId, _packet.srcAddress, _packet.dstAddress, _packet.nonce, keccak256(_packet.payload));\n        endpoint.receivePayload(_srcChainId, pathData, _dstAddress, _packet.nonce, _gasLimit, _packet.payload);\n    }\n\n    function send(address _ua, uint64, uint16 _dstChainId, bytes calldata _path, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable override onlyEndpoint {\n        address ua = _ua;\n        uint16 dstChainId = _dstChainId;\n        require(ulnLookup[dstChainId] != bytes32(0), \"LayerZero: dstChainId does not exist\");\n\n        bytes memory dstAddress;\n        uint64 nonce;\n        // code block for solving \u0027Stack Too Deep\u0027\n        {\n            uint chainAddressSize = chainAddressSizeMap[dstChainId];\n            // path = remoteAddress + localAddress\n            require(chainAddressSize != 0 \u0026\u0026 _path.length == 20 + chainAddressSize, \"LayerZero: incorrect remote address size\");\n            address srcInPath;\n            bytes memory path = _path; // copy to memory\n            assembly {\n                srcInPath := mload(add(add(path, 20), chainAddressSize)) // chainAddressSize + 20\n            }\n            require(ua == srcInPath, \"LayerZero: wrong path data\");\n            dstAddress = _path[0:chainAddressSize];\n            nonce = nonceContract.increment(dstChainId, ua, path);\n        }\n\n        bytes memory payload = _payload;\n        ApplicationConfiguration memory uaConfig = _getAppConfig(dstChainId, ua);\n\n        // compute all the fees\n        uint relayerFee = _handleRelayer(dstChainId, uaConfig, ua, payload.length, _adapterParams);\n        uint oracleFee = _handleOracle(dstChainId, uaConfig, ua);\n        uint nativeProtocolFee = _handleProtocolFee(relayerFee, oracleFee, ua, _zroPaymentAddress);\n\n        // total native fee, does not include ZRO protocol fee\n        uint totalNativeFee = relayerFee.add(oracleFee).add(nativeProtocolFee);\n\n        // assert the user has attached enough native token for this address\n        require(totalNativeFee \u003c= msg.value, \"LayerZero: not enough native for fees\");\n        // refund if they send too much\n        uint amount = msg.value.sub(totalNativeFee);\n        if (amount \u003e 0) {\n            (bool success, ) = _refundAddress.call{value: amount}(\"\");\n            require(success, \"LayerZero: failed to refund\");\n        }\n\n        // emit the data packet\n        bytes memory encodedPayload = abi.encodePacked(nonce, localChainId, ua, dstChainId, dstAddress, payload);\n        emit Packet(encodedPayload);\n    }\n\n    function _handleRelayer(uint16 _dstChainId, ApplicationConfiguration memory _uaConfig, address _ua, uint _payloadSize, bytes memory _adapterParams) internal returns (uint relayerFee) {\n        if (_adapterParams.length == 0) {\n            _adapterParams = defaultAdapterParams[_dstChainId][_uaConfig.outboundProofType];\n        }\n        address relayerAddress = _uaConfig.relayer;\n        ILayerZeroRelayerV2 relayer = ILayerZeroRelayerV2(relayerAddress);\n        relayerFee = relayer.assignJob(_dstChainId, _uaConfig.outboundProofType, _ua, _payloadSize, _adapterParams);\n\n        _creditNativeFee(relayerAddress, relayerFee);\n\n        // emit the param events\n        emit RelayerParams(_adapterParams, _uaConfig.outboundProofType);\n    }\n\n    function _handleOracle(uint16 _dstChainId, ApplicationConfiguration memory _uaConfig, address _ua) internal returns (uint oracleFee) {\n        address oracleAddress = _uaConfig.oracle;\n        oracleFee = ILayerZeroOracleV2(oracleAddress).assignJob(_dstChainId, _uaConfig.outboundProofType, _uaConfig.outboundBlockConfirmations, _ua);\n\n        _creditNativeFee(oracleAddress, oracleFee);\n    }\n\n    function _handleProtocolFee(uint _relayerFee, uint _oracleFee, address _ua, address _zroPaymentAddress) internal returns (uint protocolNativeFee) {\n        // if no ZRO token or not specifying a payment address, pay in native token\n        bool payInNative = _zroPaymentAddress == address(0x0) || address(layerZeroToken) == address(0x0);\n        uint protocolFee = treasuryContract.getFees(!payInNative, _relayerFee, _oracleFee);\n\n        if (protocolFee \u003e 0) {\n            if (payInNative) {\n                address treasuryAddress = address(treasuryContract);\n                _creditNativeFee(treasuryAddress, protocolFee);\n                protocolNativeFee = protocolFee;\n            } else {\n                // zro payment address must equal the ua or the tx.origin otherwise the transaction reverts\n                require(_zroPaymentAddress == _ua || _zroPaymentAddress == tx.origin, \"LayerZero: must be paid by sender or origin\");\n\n                // transfer the LayerZero token to this contract from the payee\n                layerZeroToken.safeTransferFrom(_zroPaymentAddress, address(this), protocolFee);\n\n                treasuryZROFees = treasuryZROFees.add(protocolFee);\n            }\n        }\n    }\n\n    function _creditNativeFee(address _receiver, uint _amount) internal {\n        nativeFees[_receiver] = nativeFees[_receiver].add(_amount);\n    }\n\n    // Can be called by any address to update a block header\n    // can only upload new block data or the same block data with more confirmations\n    function updateHash(uint16 _srcChainId, bytes32 _lookupHash, uint _confirmations, bytes32 _blockData) external override {\n        uint storedConfirmations = hashLookup[msg.sender][_srcChainId][_lookupHash][_blockData];\n\n        // if it has a record, requires a larger confirmation.\n        require(storedConfirmations \u003c _confirmations, \"LayerZero: oracle data can only update if it has more confirmations\");\n\n        // set the new information into storage\n        hashLookup[msg.sender][_srcChainId][_lookupHash][_blockData] = _confirmations;\n\n        emit HashReceived(_srcChainId, msg.sender, _lookupHash, _blockData, _confirmations);\n    }\n\n    //----------------------------------------------------------------------------------\n    // Other Library Interfaces\n\n    // default to DEFAULT setting if ZERO value\n    function getAppConfig(uint16 _remoteChainId, address _ua) external view override returns (ApplicationConfiguration memory) {\n        return _getAppConfig(_remoteChainId, _ua);\n    }\n\n    function _getAppConfig(uint16 _remoteChainId, address _ua) internal view returns (ApplicationConfiguration memory) {\n        ApplicationConfiguration memory config = appConfig[_ua][_remoteChainId];\n        ApplicationConfiguration storage defaultConfig = defaultAppConfig[_remoteChainId];\n\n        if (config.inboundProofLibraryVersion == 0) {\n            config.inboundProofLibraryVersion = defaultConfig.inboundProofLibraryVersion;\n        }\n\n        if (config.inboundBlockConfirmations == 0) {\n            config.inboundBlockConfirmations = defaultConfig.inboundBlockConfirmations;\n        }\n\n        if (config.relayer == address(0x0)) {\n            config.relayer = defaultConfig.relayer;\n        }\n\n        if (config.outboundProofType == 0) {\n            config.outboundProofType = defaultConfig.outboundProofType;\n        }\n\n        if (config.outboundBlockConfirmations == 0) {\n            config.outboundBlockConfirmations = defaultConfig.outboundBlockConfirmations;\n        }\n\n        if (config.oracle == address(0x0)) {\n            config.oracle = defaultConfig.oracle;\n        }\n\n        return config;\n    }\n\n    function setConfig(uint16 _remoteChainId, address _ua, uint _configType, bytes calldata _config) external override onlyEndpoint {\n        ApplicationConfiguration storage uaConfig = appConfig[_ua][_remoteChainId];\n        if (_configType == CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION) {\n            uint16 inboundProofLibraryVersion = abi.decode(_config, (uint16));\n            require(inboundProofLibraryVersion \u003c= maxInboundProofLibrary[_remoteChainId], \"LayerZero: invalid inbound proof library version\");\n            uaConfig.inboundProofLibraryVersion = inboundProofLibraryVersion;\n        } else if (_configType == CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS) {\n            uint64 blockConfirmations = abi.decode(_config, (uint64));\n            uaConfig.inboundBlockConfirmations = blockConfirmations;\n        } else if (_configType == CONFIG_TYPE_RELAYER) {\n            address relayer = abi.decode(_config, (address));\n            uaConfig.relayer = relayer;\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_PROOF_TYPE) {\n            uint16 outboundProofType = abi.decode(_config, (uint16));\n            require(supportedOutboundProof[_remoteChainId][outboundProofType] || outboundProofType == 0, \"LayerZero: invalid outbound proof type\");\n            uaConfig.outboundProofType = outboundProofType;\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS) {\n            uint64 blockConfirmations = abi.decode(_config, (uint64));\n            uaConfig.outboundBlockConfirmations = blockConfirmations;\n        } else if (_configType == CONFIG_TYPE_ORACLE) {\n            address oracle = abi.decode(_config, (address));\n            uaConfig.oracle = oracle;\n        } else {\n            revert(\"LayerZero: Invalid config type\");\n        }\n\n        emit AppConfigUpdated(_ua, _configType, _config);\n    }\n\n    function getConfig(uint16 _remoteChainId, address _ua, uint _configType) external view override returns (bytes memory) {\n        ApplicationConfiguration storage uaConfig = appConfig[_ua][_remoteChainId];\n\n        if (_configType == CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION) {\n            if (uaConfig.inboundProofLibraryVersion == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].inboundProofLibraryVersion);\n            }\n            return abi.encode(uaConfig.inboundProofLibraryVersion);\n        } else if (_configType == CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS) {\n            if (uaConfig.inboundBlockConfirmations == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].inboundBlockConfirmations);\n            }\n            return abi.encode(uaConfig.inboundBlockConfirmations);\n        } else if (_configType == CONFIG_TYPE_RELAYER) {\n            if (uaConfig.relayer == address(0x0)) {\n                return abi.encode(defaultAppConfig[_remoteChainId].relayer);\n            }\n            return abi.encode(uaConfig.relayer);\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_PROOF_TYPE) {\n            if (uaConfig.outboundProofType == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].outboundProofType);\n            }\n            return abi.encode(uaConfig.outboundProofType);\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS) {\n            if (uaConfig.outboundBlockConfirmations == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].outboundBlockConfirmations);\n            }\n            return abi.encode(uaConfig.outboundBlockConfirmations);\n        } else if (_configType == CONFIG_TYPE_ORACLE) {\n            if (uaConfig.oracle == address(0x0)) {\n                return abi.encode(defaultAppConfig[_remoteChainId].oracle);\n            }\n            return abi.encode(uaConfig.oracle);\n        } else {\n            revert(\"LayerZero: Invalid config type\");\n        }\n    }\n\n    // returns the native fee the UA pays to cover fees\n    function estimateFees(uint16 _dstChainId, address _ua, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParams) external view override returns (uint nativeFee, uint zroFee) {\n        ApplicationConfiguration memory uaConfig = _getAppConfig(_dstChainId, _ua);\n\n        // Relayer Fee\n        bytes memory adapterParams;\n        if (_adapterParams.length \u003e 0) {\n            adapterParams = _adapterParams;\n        } else {\n            adapterParams = defaultAdapterParams[_dstChainId][uaConfig.outboundProofType];\n        }\n        uint relayerFee = ILayerZeroRelayerV2(uaConfig.relayer).getFee(_dstChainId, uaConfig.outboundProofType, _ua, _payload.length, adapterParams);\n\n        // Oracle Fee\n        address ua = _ua; // stack too deep\n        uint oracleFee = ILayerZeroOracleV2(uaConfig.oracle).getFee(_dstChainId, uaConfig.outboundProofType, uaConfig.outboundBlockConfirmations, ua);\n\n        // LayerZero Fee\n        uint protocolFee = treasuryContract.getFees(_payInZRO, relayerFee, oracleFee);\n        _payInZRO ? zroFee = protocolFee : nativeFee = protocolFee;\n\n        // return the sum of fees\n        nativeFee = nativeFee.add(relayerFee).add(oracleFee);\n    }\n\n    //---------------------------------------------------------------------------\n    // Claim Fees\n\n    // universal withdraw ZRO token function\n    function withdrawZRO(address _to, uint _amount) external override nonReentrant {\n        require(msg.sender == address(treasuryContract), \"LayerZero: only treasury\");\n        treasuryZROFees = treasuryZROFees.sub(_amount);\n        layerZeroToken.safeTransfer(_to, _amount);\n        emit WithdrawZRO(msg.sender, _to, _amount);\n    }\n\n    // universal withdraw native token function.\n    // the source contract should perform all the authentication control\n    function withdrawNative(address payable _to, uint _amount) external override nonReentrant {\n        require(_to != address(0x0), \"LayerZero: _to cannot be zero address\");\n        nativeFees[msg.sender] = nativeFees[msg.sender].sub(_amount);\n\n        (bool success, ) = _to.call{value: _amount}(\"\");\n        require(success, \"LayerZero: withdraw failed\");\n        emit WithdrawNative(msg.sender, _to, _amount);\n    }\n\n    //---------------------------------------------------------------------------\n    // Owner calls, configuration only.\n    function setLayerZeroToken(address _layerZeroToken) external onlyOwner {\n        require(_layerZeroToken != address(0x0), \"LayerZero: _layerZeroToken cannot be zero address\");\n        layerZeroToken = IERC20(_layerZeroToken);\n        emit SetLayerZeroToken(_layerZeroToken);\n    }\n\n    function setTreasury(address _treasury) external onlyOwner {\n        require(_treasury != address(0x0), \"LayerZero: treasury cannot be zero address\");\n        treasuryContract = ILayerZeroTreasury(_treasury);\n        emit SetTreasury(_treasury);\n    }\n\n    function addInboundProofLibraryForChain(uint16 _chainId, address _library) external onlyOwner {\n        require(_library != address(0x0), \"LayerZero: library cannot be zero address\");\n        uint16 libId = maxInboundProofLibrary[_chainId];\n        require(libId \u003c 65535, \"LayerZero: can not add new library\");\n        maxInboundProofLibrary[_chainId] = ++libId;\n        inboundProofLibrary[_chainId][libId] = _library;\n        emit AddInboundProofLibraryForChain(_chainId, _library);\n    }\n\n    function enableSupportedOutboundProof(uint16 _chainId, uint16 _proofType) external onlyOwner {\n        supportedOutboundProof[_chainId][_proofType] = true;\n        emit EnableSupportedOutboundProof(_chainId, _proofType);\n    }\n\n    function setDefaultConfigForChainId(uint16 _chainId, uint16 _inboundProofLibraryVersion, uint64 _inboundBlockConfirmations, address _relayer, uint16 _outboundProofType, uint64 _outboundBlockConfirmations, address _oracle) external onlyOwner {\n        require(_inboundProofLibraryVersion \u003c= maxInboundProofLibrary[_chainId] \u0026\u0026 _inboundProofLibraryVersion \u003e 0, \"LayerZero: invalid inbound proof library version\");\n        require(_inboundBlockConfirmations \u003e 0, \"LayerZero: invalid inbound block confirmation\");\n        require(_relayer != address(0x0), \"LayerZero: invalid relayer address\");\n        require(supportedOutboundProof[_chainId][_outboundProofType], \"LayerZero: invalid outbound proof type\");\n        require(_outboundBlockConfirmations \u003e 0, \"LayerZero: invalid outbound block confirmation\");\n        require(_oracle != address(0x0), \"LayerZero: invalid oracle address\");\n        defaultAppConfig[_chainId] = ApplicationConfiguration(_inboundProofLibraryVersion, _inboundBlockConfirmations, _relayer, _outboundProofType, _outboundBlockConfirmations, _oracle);\n        emit SetDefaultConfigForChainId(_chainId, _inboundProofLibraryVersion, _inboundBlockConfirmations, _relayer, _outboundProofType, _outboundBlockConfirmations, _oracle);\n    }\n\n    function setDefaultAdapterParamsForChainId(uint16 _chainId, uint16 _proofType, bytes calldata _adapterParams) external onlyOwner {\n        defaultAdapterParams[_chainId][_proofType] = _adapterParams;\n        emit SetDefaultAdapterParamsForChainId(_chainId, _proofType, _adapterParams);\n    }\n\n    function setRemoteUln(uint16 _remoteChainId, bytes32 _remoteUln) external onlyOwner {\n        require(ulnLookup[_remoteChainId] == bytes32(0), \"LayerZero: remote uln already set\");\n        ulnLookup[_remoteChainId] = _remoteUln;\n        emit SetRemoteUln(_remoteChainId, _remoteUln);\n    }\n\n    function setChainAddressSize(uint16 _chainId, uint _size) external onlyOwner {\n        require(chainAddressSizeMap[_chainId] == 0, \"LayerZero: remote chain address size already set\");\n        chainAddressSizeMap[_chainId] = _size;\n        emit SetChainAddressSize(_chainId, _size);\n    }\n\n    //----------------------------------------------------------------------------------\n    // view functions\n\n    function accruedNativeFee(address _address) external view override returns (uint) {\n        return nativeFees[_address];\n    }\n\n    function getOutboundNonce(uint16 _chainId, bytes calldata _path) external view override returns (uint64) {\n        return nonceContract.outboundNonce(_chainId, _path);\n    }\n\n    function _isContract(address addr) internal view returns (bool) {\n        uint size;\n        assembly {\n            size := extcodesize(addr)\n        }\n        return size != 0;\n    }\n}\n"}}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.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 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// Copyright (C) 2015, 2016, 2017 Dapphub
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.6;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IStargateEthVault.sol";
// This contract always UNWRAPS the erc20 for native gas token on transfer + transferFrom.
// If you wish to disable the transfer auto-unwrap, you can specify _to addresses with `setNoUnwrapTo`
contract StargateEthVault is IStargateEthVault, Ownable, ReentrancyGuard {
    string public constant name     = "Stargate Ether Vault";
    string public constant symbol   = "SGETH";
    uint8  public constant decimals = 18;
    uint256 public totalSupply;
    event Approval(address indexed src, address indexed guy, uint wad);
    event Transfer(address indexed src, address indexed dst, uint wad);
    event Deposit(address indexed dst, uint wad);
    event Withdrawal(address indexed src, uint wad);
    event TransferNative(address indexed src, address indexed dst, uint wad);
    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;
    mapping (address => bool)                       public  noUnwrapTo;
    // if you do NOT wish to unwrap eth on transfers TO certain addresses
    function setNoUnwrapTo(address _addr) external onlyOwner {
        noUnwrapTo[_addr] = true;
    }
    function deposit() public payable override {
        balanceOf[msg.sender] += msg.value;
        totalSupply += msg.value;
        emit Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) external override {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        totalSupply -= wad;
        emit Withdrawal(msg.sender, wad);
    }
    function approve(address guy, uint wad) external override returns (bool) {
        allowance[msg.sender][guy] = wad;
        emit Approval(msg.sender, guy, wad);
        return true;
    }
    function transfer(address dst, uint wad) external override returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }
    function transferFrom(address src, address dst, uint wad) public override nonReentrant returns (bool) {
        require(balanceOf[src] >= wad);
        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }
        // always decrement the src (payer) address
        balanceOf[src] -= wad;
        if(noUnwrapTo[dst]){
            // we do *not* unwrap
            balanceOf[dst] += wad;
            emit Transfer(src, dst, wad);
        } else {
            // unwrap and send native gas token
            totalSupply -= wad; // if its getting unwrapped, decrement the totalSupply
            (bool success, ) = dst.call{value: wad}("");
            require(success, "SGETH: failed to transfer");
            emit TransferNative(src, dst, wad);
        }
        return true;
    }
    function renounceOwnership() public override onlyOwner {}
    receive() external payable {
        deposit();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.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 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
pragma solidity 0.7.6;
interface IStargateEthVault {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
    function approve(address guy, uint wad) external returns (bool);
    function transferFrom(address src, address dst, uint wad) external returns (bool);
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "./utility/LayerZeroPacket.sol";
import "./utility/UltraLightNodeEVMDecoder.sol";
import "../interfaces/IValidationLibraryHelperV2.sol";
import "../interfaces/ILayerZeroValidationLibrary.sol";
interface IStargate {
    // Stargate objects for abi encoding / decoding
    struct SwapObj {
        uint amount;
        uint eqFee;
        uint eqReward;
        uint lpFee;
        uint protocolFee;
        uint lkbRemove;
    }
    struct CreditObj {
        uint credits;
        uint idealBalance;
    }
}
contract MPTValidator01 is ILayerZeroValidationLibrary, IValidationLibraryHelperV2 {
    using RLPDecode for RLPDecode.RLPItem;
    using RLPDecode for RLPDecode.Iterator;
    uint8 public proofType = 1;
    uint8 public utilsVersion = 4;
    bytes32 public constant PACKET_SIGNATURE = 0xe9bded5f24a4168e4f3bf44e00298c993b22376aad8c58c7dda9718a54cbea82;
    address public immutable stargateBridgeAddress;
    address public immutable stargateTokenAddress;
    constructor(address _stargateBridgeAddress, address _stargateTokenAddress) {
        stargateBridgeAddress = _stargateBridgeAddress;
        stargateTokenAddress = _stargateTokenAddress;
    }
    function validateProof(bytes32 _receiptsRoot, bytes calldata _transactionProof, uint _remoteAddressSize) external view override returns (LayerZeroPacket.Packet memory packet) {
        require(_remoteAddressSize > 0, "ProofLib: invalid address size");
        (bytes[] memory proof, uint[] memory receiptSlotIndex, uint logIndex) = abi.decode(_transactionProof, (bytes[], uint[], uint));
        ULNLog memory log = _getVerifiedLog(_receiptsRoot, receiptSlotIndex, logIndex, proof);
        require(log.topicZeroSig == PACKET_SIGNATURE, "ProofLib: packet not recognized"); //data
        packet = LayerZeroPacket.getPacketV2(log.data, _remoteAddressSize, log.contractAddress);
        if (packet.dstAddress == stargateBridgeAddress) packet.payload = _secureStgPayload(packet.payload);
        if (packet.dstAddress == stargateTokenAddress) packet.payload = _secureStgTokenPayload(packet.payload);
        return packet;
    }
    function _secureStgTokenPayload(bytes memory _payload) internal pure returns (bytes memory) {
        (bytes memory toAddressBytes, uint qty) = abi.decode(_payload, (bytes, uint));
        address toAddress = address(0);
        if (toAddressBytes.length > 0) {
            assembly {
                toAddress := mload(add(toAddressBytes, 20))
            }
        }
        if (toAddress == address(0)) {
            address deadAddress = address(0x000000000000000000000000000000000000dEaD);
            bytes memory newToAddressBytes = abi.encodePacked(deadAddress);
            return abi.encode(newToAddressBytes, qty);
        }
        // default to return the original payload
        return _payload;
    }
    function _secureStgPayload(bytes memory _payload) internal view returns (bytes memory) {
        // functionType is uint8 even though the encoding will take up the side of uint256
        uint8 functionType;
        assembly {
            functionType := mload(add(_payload, 32))
        }
        // TYPE_SWAP_REMOTE == 1 && only if the payload has a payload
        // only swapRemote inside of stargate can call sgReceive on an user supplied to address
        // thus we do not care about the other type functions even if the toAddress is overly long.
        if (functionType == 1) {
            // decode the _payload with its types
            (, uint srcPoolId, uint dstPoolId, uint dstGasForCall, IStargate.CreditObj memory c, IStargate.SwapObj memory s, bytes memory toAddressBytes, bytes memory contractCallPayload) = abi.decode(_payload, (uint8, uint, uint, uint, IStargate.CreditObj, IStargate.SwapObj, bytes, bytes));
            // if contractCallPayload.length > 0 need to check if the to address is a contract or not
            if (contractCallPayload.length > 0) {
                // otherwise, need to check if the payload can be delivered to the toAddress
                address toAddress = address(0);
                if (toAddressBytes.length > 0) {
                    assembly {
                        toAddress := mload(add(toAddressBytes, 20))
                    }
                }
                // check if the toAddress is a contract. We are not concerned about addresses that pretend to be wallets. because worst case we just delete their payload if being malicious
                // we can guarantee that if a size > 0, then the contract is definitely a contract address in this context
                uint size;
                assembly {
                    size := extcodesize(toAddress)
                }
                if (size == 0) {
                    // size == 0 indicates its not a contract, payload wont be delivered
                    // secure the _payload to make sure funds can be delivered to the toAddress
                    bytes memory newToAddressBytes = abi.encodePacked(toAddress);
                    bytes memory securePayload = abi.encode(functionType, srcPoolId, dstPoolId, dstGasForCall, c, s, newToAddressBytes, bytes(""));
                    return securePayload;
                }
            }
        }
        // default to return the original payload
        return _payload;
    }
    function secureStgTokenPayload(bytes memory _payload) external pure returns (bytes memory) {
        return _secureStgTokenPayload(_payload);
    }
    function secureStgPayload(bytes memory _payload) external view returns (bytes memory) {
        return _secureStgPayload(_payload);
    }
    function _getVerifiedLog(bytes32 hashRoot, uint[] memory paths, uint logIndex, bytes[] memory proof) internal pure returns (ULNLog memory) {
        require(paths.length == proof.length, "ProofLib: invalid proof size");
        require(proof.length > 0, "ProofLib: proof size must > 0");
        RLPDecode.RLPItem memory item;
        bytes memory proofBytes;
        for (uint i = 0; i < proof.length; i++) {
            proofBytes = proof[i];
            require(hashRoot == keccak256(proofBytes), "ProofLib: invalid hashlink");
            item = RLPDecode.toRlpItem(proofBytes).safeGetItemByIndex(paths[i]);
            if (i < proof.length - 1) hashRoot = bytes32(item.toUint());
        }
        // burning status + gasUsed + logBloom
        RLPDecode.RLPItem memory logItem = item.typeOffset().safeGetItemByIndex(3);
        RLPDecode.Iterator memory it = logItem.safeGetItemByIndex(logIndex).iterator();
        ULNLog memory log;
        log.contractAddress = bytes32(it.next().toUint());
        log.topicZeroSig = bytes32(it.next().safeGetItemByIndex(0).toUint());
        log.data = it.next().toBytes();
        return log;
    }
    function getUtilsVersion() external view override returns (uint8) {
        return utilsVersion;
    }
    function getProofType() external view override returns (uint8) {
        return proofType;
    }
    function getVerifyLog(bytes32 hashRoot, uint[] memory receiptSlotIndex, uint logIndex, bytes[] memory proof) external pure override returns (ULNLog memory) {
        return _getVerifiedLog(hashRoot, receiptSlotIndex, logIndex, proof);
    }
    function getPacket(bytes memory data, uint sizeOfSrcAddress, bytes32 ulnAddress) external pure override returns (LayerZeroPacket.Packet memory) {
        return LayerZeroPacket.getPacketV2(data, sizeOfSrcAddress, ulnAddress);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "./Buffer.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
library LayerZeroPacket {
    using Buffer for Buffer.buffer;
    using SafeMath for uint;
    struct Packet {
        uint16 srcChainId;
        uint16 dstChainId;
        uint64 nonce;
        address dstAddress;
        bytes srcAddress;
        bytes32 ulnAddress;
        bytes payload;
    }
    function getPacket(
        bytes memory data,
        uint16 srcChain,
        uint sizeOfSrcAddress,
        bytes32 ulnAddress
    ) internal pure returns (LayerZeroPacket.Packet memory) {
        uint16 dstChainId;
        address dstAddress;
        uint size;
        uint64 nonce;
        // The log consists of the destination chain id and then a bytes payload
        //      0--------------------------------------------31
        // 0   |  total bytes size
        // 32  |  destination chain id
        // 64  |  bytes offset
        // 96  |  bytes array size
        // 128 |  payload
        assembly {
            dstChainId := mload(add(data, 32))
            size := mload(add(data, 96)) /// size of the byte array
            nonce := mload(add(data, 104)) // offset to convert to uint64  128  is index -24
            dstAddress := mload(add(data, sub(add(128, sizeOfSrcAddress), 4))) // offset to convert to address 12 -8
        }
        Buffer.buffer memory srcAddressBuffer;
        srcAddressBuffer.init(sizeOfSrcAddress);
        srcAddressBuffer.writeRawBytes(0, data, 136, sizeOfSrcAddress); // 128 + 8
        uint payloadSize = size.sub(28).sub(sizeOfSrcAddress);
        Buffer.buffer memory payloadBuffer;
        payloadBuffer.init(payloadSize);
        payloadBuffer.writeRawBytes(0, data, sizeOfSrcAddress.add(156), payloadSize); // 148 + 8
        return LayerZeroPacket.Packet(srcChain, dstChainId, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);
    }
    function getPacketV2(
        bytes memory data,
        uint sizeOfSrcAddress,
        bytes32 ulnAddress
    ) internal pure returns (LayerZeroPacket.Packet memory) {
        // packet def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);
        // data def: abi.encode(packet) = offset(32) + length(32) + packet
        //              if from EVM
        // 0 - 31       0 - 31          |  total bytes size
        // 32 - 63      32 - 63         |  location
        // 64 - 95      64 - 95         |  size of the packet
        // 96 - 103     96 - 103        |  nonce
        // 104 - 105    104 - 105       |  srcChainId
        // 106 - P      106 - 125       |  srcAddress, where P = 106 + sizeOfSrcAddress - 1,
        // P+1 - P+2    126 - 127       |  dstChainId
        // P+3 - P+22   128 - 147       |  dstAddress
        // P+23 - END   148 - END       |  payload
        // decode the packet
        uint256 realSize;
        uint64 nonce;
        uint16 srcChain;
        uint16 dstChain;
        address dstAddress;
        assembly {
            realSize := mload(add(data, 64))
            nonce := mload(add(data, 72)) // 104 - 32
            srcChain := mload(add(data, 74)) // 106 - 32
            dstChain := mload(add(data, add(76, sizeOfSrcAddress))) // P + 3 - 32 = 105 + size + 3 - 32 = 76 + size
            dstAddress := mload(add(data, add(96, sizeOfSrcAddress))) // P + 23 - 32 = 105 + size + 23 - 32 = 96 + size
        }
        require(srcChain != 0, "LayerZeroPacket: invalid packet");
        Buffer.buffer memory srcAddressBuffer;
        srcAddressBuffer.init(sizeOfSrcAddress);
        srcAddressBuffer.writeRawBytes(0, data, 106, sizeOfSrcAddress);
        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20
        uint payloadSize = realSize.sub(nonPayloadSize);
        Buffer.buffer memory payloadBuffer;
        payloadBuffer.init(payloadSize);
        payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(96), payloadSize);
        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);
    }
    function getPacketV3(
        bytes memory data,
        uint sizeOfSrcAddress,
        bytes32 ulnAddress
    ) internal pure returns (LayerZeroPacket.Packet memory) {
        // data def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);
        //              if from EVM
        // 0 - 31       0 - 31          |  total bytes size
        // 32 - 39      32 - 39         |  nonce
        // 40 - 41      40 - 41         |  srcChainId
        // 42 - P       42 - 61         |  srcAddress, where P = 41 + sizeOfSrcAddress,
        // P+1 - P+2    62 - 63         |  dstChainId
        // P+3 - P+22   64 - 83         |  dstAddress
        // P+23 - END   84 - END        |  payload
        // decode the packet
        uint256 realSize = data.length;
        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20
        require(realSize >= nonPayloadSize, "LayerZeroPacket: invalid packet");
        uint payloadSize = realSize - nonPayloadSize;
        uint64 nonce;
        uint16 srcChain;
        uint16 dstChain;
        address dstAddress;
        assembly {
            nonce := mload(add(data, 8)) // 40 - 32
            srcChain := mload(add(data, 10)) // 42 - 32
            dstChain := mload(add(data, add(12, sizeOfSrcAddress))) // P + 3 - 32 = 41 + size + 3 - 32 = 12 + size
            dstAddress := mload(add(data, add(32, sizeOfSrcAddress))) // P + 23 - 32 = 41 + size + 23 - 32 = 32 + size
        }
        require(srcChain != 0, "LayerZeroPacket: invalid packet");
        Buffer.buffer memory srcAddressBuffer;
        srcAddressBuffer.init(sizeOfSrcAddress);
        srcAddressBuffer.writeRawBytes(0, data, 42, sizeOfSrcAddress);
        Buffer.buffer memory payloadBuffer;
        if (payloadSize > 0) {
            payloadBuffer.init(payloadSize);
            payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(32), payloadSize);
        }
        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.0;
pragma abicoder v2;
import "./RLPDecode.sol";
library UltraLightNodeEVMDecoder {
    using RLPDecode for RLPDecode.RLPItem;
    using RLPDecode for RLPDecode.Iterator;
    struct Log {
        address contractAddress;
        bytes32 topicZero;
        bytes data;
    }
    function getReceiptLog(bytes memory data, uint logIndex) internal pure returns (Log memory) {
        RLPDecode.Iterator memory it = RLPDecode.toRlpItem(data).iterator();
        uint idx;
        while (it.hasNext()) {
            if (idx == 3) {
                return toReceiptLog(it.next().getItemByIndex(logIndex).toRlpBytes());
            } else it.next();
            idx++;
        }
        revert("no log index in receipt");
    }
    function toReceiptLog(bytes memory data) internal pure returns (Log memory) {
        RLPDecode.Iterator memory it = RLPDecode.toRlpItem(data).iterator();
        Log memory log;
        uint idx;
        while (it.hasNext()) {
            if (idx == 0) {
                log.contractAddress = it.next().toAddress();
            } else if (idx == 1) {
                RLPDecode.RLPItem memory item = it.next().getItemByIndex(0);
                log.topicZero = bytes32(item.toUint());
            } else if (idx == 2) log.data = it.next().toBytes();
            else it.next();
            idx++;
        }
        return log;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.7.0;
pragma abicoder v2;
import "../proof/utility/LayerZeroPacket.sol";
interface IValidationLibraryHelperV2 {
    struct ULNLog {
        bytes32 contractAddress;
        bytes32 topicZeroSig;
        bytes data;
    }
    function getVerifyLog(bytes32 hashRoot, uint[] calldata receiptSlotIndex, uint logIndex, bytes[] calldata proof) external pure returns (ULNLog memory);
    function getPacket(bytes calldata data, uint sizeOfSrcAddress, bytes32 ulnAddress) external pure returns (LayerZeroPacket.Packet memory);
    function getUtilsVersion() external view returns (uint8);
    function getProofType() external view returns (uint8);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.7.0;
pragma abicoder v2;
import "../proof/utility/LayerZeroPacket.sol";
interface ILayerZeroValidationLibrary {
    function validateProof(bytes32 blockData, bytes calldata _data, uint _remoteAddressSize) external returns (LayerZeroPacket.Packet memory packet);
}
// SPDX-License-Identifier: BUSL-1.1
// https://github.com/ensdomains/buffer
pragma solidity ^0.7.0;
/**
 * @dev A library for working with mutable byte buffers in Solidity.
 *
 * Byte buffers are mutable and expandable, and provide a variety of primitives
 * for writing to them. At any time you can fetch a bytes object containing the
 * current contents of the buffer. The bytes object should not be stored between
 * operations, as it may change due to resizing of the buffer.
 */
library Buffer {
    /**
     * @dev Represents a mutable buffer. Buffers have a current value (buf) and
     *      a capacity. The capacity may be longer than the current value, in
     *      which case it can be extended without the need to allocate more memory.
     */
    struct buffer {
        bytes buf;
        uint capacity;
    }
    /**
     * @dev Initializes a buffer with an initial capacity.a co
     * @param buf The buffer to initialize.
     * @param capacity The number of bytes of space to allocate the buffer.
     * @return The buffer, for chaining.
     */
    function init(buffer memory buf, uint capacity) internal pure returns (buffer memory) {
        if (capacity % 32 != 0) {
            capacity += 32 - (capacity % 32);
        }
        // Allocate space for the buffer data
        buf.capacity = capacity;
        assembly {
            let ptr := mload(0x40)
            mstore(buf, ptr)
            mstore(ptr, 0)
            mstore(0x40, add(32, add(ptr, capacity)))
        }
        return buf;
    }
    /**
     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed
     *      the capacity of the buffer.
     * @param buf The buffer to append to.
     * @param off The start offset to write to.
     * @param rawData The data to append.
     * @param len The number of bytes to copy.
     * @return The original buffer, for chaining.
     */
    function writeRawBytes(
        buffer memory buf,
        uint off,
        bytes memory rawData,
        uint offData,
        uint len
    ) internal pure returns (buffer memory) {
        if (off + len > buf.capacity) {
            resize(buf, max(buf.capacity, len + off) * 2);
        }
        uint dest;
        uint src;
        assembly {
            // Memory address of the buffer data
            let bufptr := mload(buf)
            // Length of existing buffer data
            let buflen := mload(bufptr)
            // Start address = buffer address + offset + sizeof(buffer length)
            dest := add(add(bufptr, 32), off)
            // Update buffer length if we're extending it
            if gt(add(len, off), buflen) {
                mstore(bufptr, add(len, off))
            }
            src := add(rawData, offData)
        }
        // Copy word-length chunks while possible
        for (; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }
        // Copy remaining bytes
        uint mask = 256**(32 - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
        return buf;
    }
    /**
     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed
     *      the capacity of the buffer.
     * @param buf The buffer to append to.
     * @param off The start offset to write to.
     * @param data The data to append.
     * @param len The number of bytes to copy.
     * @return The original buffer, for chaining.
     */
    function write(buffer memory buf, uint off, bytes memory data, uint len) internal pure returns (buffer memory) {
        require(len <= data.length);
        if (off + len > buf.capacity) {
            resize(buf, max(buf.capacity, len + off) * 2);
        }
        uint dest;
        uint src;
        assembly {
        // Memory address of the buffer data
            let bufptr := mload(buf)
        // Length of existing buffer data
            let buflen := mload(bufptr)
        // Start address = buffer address + offset + sizeof(buffer length)
            dest := add(add(bufptr, 32), off)
        // Update buffer length if we're extending it
            if gt(add(len, off), buflen) {
                mstore(bufptr, add(len, off))
            }
            src := add(data, 32)
        }
        // Copy word-length chunks while possible
        for (; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }
        // Copy remaining bytes
        uint mask = 256**(32 - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
        return buf;
    }
    function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) {
        return write(buf, buf.buf.length, data, data.length);
    }
    function resize(buffer memory buf, uint capacity) private pure {
        bytes memory oldbuf = buf.buf;
        init(buf, capacity);
        append(buf, oldbuf);
    }
    function max(uint a, uint b) private pure returns (uint) {
        if (a > b) {
            return a;
        }
        return b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: BUSL-1.1
// https://github.com/hamdiallam/solidity-rlp
pragma solidity ^0.7.0;
library RLPDecode {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START = 0xb8;
    uint8 constant LIST_SHORT_START = 0xc0;
    uint8 constant LIST_LONG_START = 0xf8;
    uint8 constant WORD_SIZE = 32;
    struct RLPItem {
        uint len;
        uint memPtr;
    }
    struct Iterator {
        RLPItem item; // Item that's being iterated over.
        uint nextPtr; // Position of the next item in the list.
    }
    /*
     * @dev Returns the next element in the iteration. Reverts if it has not next element.
     * @param self The iterator.
     * @return The next element in the iteration.
     */
    function next(Iterator memory self) internal pure returns (RLPItem memory) {
        require(hasNext(self), "RLPDecoder iterator has no next");
        uint ptr = self.nextPtr;
        uint itemLength = _itemLength(ptr);
        self.nextPtr = ptr + itemLength;
        return RLPItem(itemLength, ptr);
    }
    /*
     * @dev Returns true if the iteration has more elements.
     * @param self The iterator.
     * @return true if the iteration has more elements.
     */
    function hasNext(Iterator memory self) internal pure returns (bool) {
        RLPItem memory item = self.item;
        return self.nextPtr < item.memPtr + item.len;
    }
    /*
     * @param item RLP encoded bytes
     */
    function toRlpItem(bytes memory item) internal pure returns (RLPItem memory) {
        uint memPtr;
        assembly {
            memPtr := add(item, 0x20)
        }
        // offset the pointer if the first byte
        uint8 byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }
        uint len = item.length;
        if (len > 0 && byte0 < LIST_SHORT_START) {
            assembly {
                memPtr := add(memPtr, 0x01)
            }
            len -= 1;
        }
        return RLPItem(len, memPtr);
    }
    /*
     * @dev Create an iterator. Reverts if item is not a list.
     * @param self The RLP item.
     * @return An 'Iterator' over the item.
     */
    function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
        require(isList(self), "RLPDecoder iterator is not list");
        uint ptr = self.memPtr + _payloadOffset(self.memPtr);
        return Iterator(self, ptr);
    }
    /*
     * @param item RLP encoded bytes
     */
    function rlpLen(RLPItem memory item) internal pure returns (uint) {
        return item.len;
    }
    /*
     * @param item RLP encoded bytes
     */
    function payloadLen(RLPItem memory item) internal pure returns (uint) {
        uint offset = _payloadOffset(item.memPtr);
        require(item.len >= offset, "RLPDecoder: invalid uint RLP item offset size");
        return item.len - offset;
    }
    /*
     * @param item RLP encoded list in bytes
     */
    function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
        require(isList(item), "RLPDecoder iterator is not a list");
        uint items = numItems(item);
        RLPItem[] memory result = new RLPItem[](items);
        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < items; i++) {
            dataLen = _itemLength(memPtr);
            result[i] = RLPItem(dataLen, memPtr);
            memPtr = memPtr + dataLen;
        }
        return result;
    }
    /*
     * @param get the RLP item by index. save gas.
     */
    function getItemByIndex(RLPItem memory item, uint idx) internal pure returns (RLPItem memory) {
        require(isList(item), "RLPDecoder iterator is not a list");
        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < idx; i++) {
            dataLen = _itemLength(memPtr);
            memPtr = memPtr + dataLen;
        }
        dataLen = _itemLength(memPtr);
        return RLPItem(dataLen, memPtr);
    }
    /*
     * @param get the RLP item by index. save gas.
     */
    function safeGetItemByIndex(RLPItem memory item, uint idx) internal pure returns (RLPItem memory) {
        require(isList(item), "RLPDecoder iterator is not a list");
        require(idx < numItems(item), "RLP item out of bounds");
        uint endPtr = item.memPtr + item.len;
        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < idx; i++) {
            dataLen = _itemLength(memPtr);
            memPtr = memPtr + dataLen;
        }
        dataLen = _itemLength(memPtr);
        require(memPtr + dataLen <= endPtr, "RLP item overflow");
        return RLPItem(dataLen, memPtr);
    }
    /*
     * @param offset the receipt bytes item
     */
    function typeOffset(RLPItem memory item) internal pure returns (RLPItem memory) {
        uint offset = _payloadOffset(item.memPtr);
        uint8 byte0;
        uint memPtr = item.memPtr;
        uint len = item.len;
        assembly {
            memPtr := add(memPtr, offset)
            byte0 := byte(0, mload(memPtr))
        }
        if (len >0 && byte0 < LIST_SHORT_START) {
            assembly {
                memPtr := add(memPtr, 0x01)
            }
            len -= 1;
        }
        return RLPItem(len, memPtr);
    }
    // @return indicator whether encoded payload is a list. negate this function call for isData.
    function isList(RLPItem memory item) internal pure returns (bool) {
        if (item.len == 0) return false;
        uint8 byte0;
        uint memPtr = item.memPtr;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }
        if (byte0 < LIST_SHORT_START) return false;
        return true;
    }
    /** RLPItem conversions into data types **/
    // @returns raw rlp encoding in bytes
    function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
        bytes memory result = new bytes(item.len);
        if (result.length == 0) return result;
        uint ptr;
        assembly {
            ptr := add(0x20, result)
        }
        copy(item.memPtr, ptr, item.len);
        return result;
    }
    // any non-zero byte except "0x80" is considered true
    function toBoolean(RLPItem memory item) internal pure returns (bool) {
        require(item.len == 1, "RLPDecoder toBoolean invalid length");
        uint result;
        uint memPtr = item.memPtr;
        assembly {
            result := byte(0, mload(memPtr))
        }
        // SEE Github Issue #5.
        // Summary: Most commonly used RLP libraries (i.e Geth) will encode
        // "0" as "0x80" instead of as "0". We handle this edge case explicitly
        // here.
        if (result == 0 || result == STRING_SHORT_START) {
            return false;
        } else {
            return true;
        }
    }
    function toAddress(RLPItem memory item) internal pure returns (address) {
        // 1 byte for the length prefix
        require(item.len == 21, "RLPDecoder toAddress invalid length");
        return address(toUint(item));
    }
    function toUint(RLPItem memory item) internal pure returns (uint) {
        require(item.len > 0 && item.len <= 33, "RLPDecoder toUint invalid length");
        uint offset = _payloadOffset(item.memPtr);
        require(item.len >= offset, "RLPDecoder: invalid RLP item offset size");
        uint len = item.len - offset;
        uint result;
        uint memPtr = item.memPtr + offset;
        assembly {
            result := mload(memPtr)
            // shift to the correct location if necessary
            if lt(len, 32) {
                result := div(result, exp(256, sub(32, len)))
            }
        }
        return result;
    }
    // enforces 32 byte length
    function toUintStrict(RLPItem memory item) internal pure returns (uint) {
        // one byte prefix
        require(item.len == 33, "RLPDecoder toUintStrict invalid length");
        uint result;
        uint memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }
        return result;
    }
    function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
        require(item.len > 0, "RLPDecoder toBytes invalid length");
        uint offset = _payloadOffset(item.memPtr);
        require(item.len >= offset, "RLPDecoder: invalid RLP item offset size");
        uint len = item.len - offset; // data length
        bytes memory result = new bytes(len);
        uint destPtr;
        assembly {
            destPtr := add(0x20, result)
        }
        copy(item.memPtr + offset, destPtr, len);
        return result;
    }
    /*
     * Private Helpers
     */
    // @return number of payload items inside an encoded list.
    function numItems(RLPItem memory item) internal pure returns (uint) {
        if (item.len == 0) return 0;
        uint count = 0;
        uint currPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint endPtr = item.memPtr + item.len;
        while (currPtr < endPtr) {
            currPtr = currPtr + _itemLength(currPtr); // skip over an item
            count++;
        }
        return count;
    }
    // @return entire rlp item byte length
    function _itemLength(uint memPtr) private pure returns (uint) {
        uint itemLen;
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }
        if (byte0 < STRING_SHORT_START) itemLen = 1;
        else if (byte0 < STRING_LONG_START) itemLen = byte0 - STRING_SHORT_START + 1;
        else if (byte0 < LIST_SHORT_START) {
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                memPtr := add(memPtr, 1) // skip over the first byte
                /* 32 byte word size */
                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
                itemLen := add(dataLen, add(byteLen, 1))
            }
        } else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        } else {
            assembly {
                let byteLen := sub(byte0, 0xf7)
                memPtr := add(memPtr, 1)
                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
                itemLen := add(dataLen, add(byteLen, 1))
            }
        }
        return itemLen;
    }
    // @return number of bytes until the data
    function _payloadOffset(uint memPtr) private pure returns (uint) {
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }
        if (byte0 < STRING_SHORT_START) return 0;
        else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)) return 1;
        else if (byte0 < LIST_SHORT_START)
            // being explicit
            return byte0 - (STRING_LONG_START - 1) + 1;
        else return byte0 - (LIST_LONG_START - 1) + 1;
    }
    /*
     * @param src Pointer to source
     * @param dest Pointer to destination
     * @param len Amount of memory to copy from the source
     */
    function copy(
        uint src,
        uint dest,
        uint len
    ) private pure {
        if (len == 0) return;
        // copy as many word sizes as possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }
            src += WORD_SIZE;
            dest += WORD_SIZE;
        }
        // left over bytes. Mask is used to remove unwanted bytes from the word
        uint mask = 256**(WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask)) // zero out src
            let destpart := and(mload(dest), mask) // retrieve the bytes
            mstore(dest, or(destpart, srcpart))
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "./interfaces/ILayerZeroReceiver.sol";
import "./interfaces/ILayerZeroEndpoint.sol";
import "./interfaces/ILayerZeroMessagingLibrary.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract Endpoint is Ownable, ILayerZeroEndpoint {
    uint16 public immutable chainId;
    // installed libraries and reserved versions
    uint16 public constant BLOCK_VERSION = 65535;
    uint16 public constant DEFAULT_VERSION = 0;
    uint16 public latestVersion;
    mapping(uint16 => ILayerZeroMessagingLibrary) public libraryLookup; // version -> ILayerZeroEndpointLibrary
    // default send/receive libraries
    uint16 public defaultSendVersion;
    uint16 public defaultReceiveVersion;
    ILayerZeroMessagingLibrary public defaultSendLibrary;
    address public defaultReceiveLibraryAddress;
    struct LibraryConfig {
        uint16 sendVersion;
        uint16 receiveVersion;
        address receiveLibraryAddress;
        ILayerZeroMessagingLibrary sendLibrary;
    }
    struct StoredPayload {
        uint64 payloadLength;
        address dstAddress;
        bytes32 payloadHash;
    }
    // user app config = [uaAddress]
    mapping(address => LibraryConfig) public uaConfigLookup;
    // inboundNonce = [srcChainId][srcAddress].
    mapping(uint16 => mapping(bytes => uint64)) public inboundNonce;
    // outboundNonce = [dstChainId][srcAddress].
    mapping(uint16 => mapping(address => uint64)) public outboundNonce;
    // storedPayload = [srcChainId][srcAddress]
    mapping(uint16 => mapping(bytes => StoredPayload)) public storedPayload;
    // library versioning events
    event NewLibraryVersionAdded(uint16 version);
    event DefaultSendVersionSet(uint16 version);
    event DefaultReceiveVersionSet(uint16 version);
    event UaSendVersionSet(address ua, uint16 version);
    event UaReceiveVersionSet(address ua, uint16 version);
    event UaForceResumeReceive(uint16 chainId, bytes srcAddress);
    // payload events
    event PayloadCleared(uint16 srcChainId, bytes srcAddress, uint64 nonce, address dstAddress);
    event PayloadStored(uint16 srcChainId, bytes srcAddress, address dstAddress, uint64 nonce, bytes payload, bytes reason);
    constructor(uint16 _chainId) {
        chainId = _chainId;
    }
    //---------------------------------------------------------------------------
    // send and receive nonreentrant lock
    uint8 internal constant _NOT_ENTERED = 1;
    uint8 internal constant _ENTERED = 2;
    uint8 internal _send_entered_state = 1;
    uint8 internal _receive_entered_state = 1;
    modifier sendNonReentrant() {
        require(_send_entered_state == _NOT_ENTERED, "LayerZero: no send reentrancy");
        _send_entered_state = _ENTERED;
        _;
        _send_entered_state = _NOT_ENTERED;
    }
    modifier receiveNonReentrant() {
        require(_receive_entered_state == _NOT_ENTERED, "LayerZero: no receive reentrancy");
        _receive_entered_state = _ENTERED;
        _;
        _receive_entered_state = _NOT_ENTERED;
    }
    // BLOCK_VERSION is also a valid version
    modifier validVersion(uint16 _version) {
        require(_version <= latestVersion || _version == BLOCK_VERSION, "LayerZero: invalid messaging library version");
        _;
    }
    //---------------------------------------------------------------------------
    // User Application Calls - Endpoint Interface
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable override sendNonReentrant {
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uint64 nonce = ++outboundNonce[_dstChainId][msg.sender];
        _getSendLibrary(uaConfig).send{value: msg.value}(msg.sender, nonce, _dstChainId, _destination, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);
    }
    //---------------------------------------------------------------------------
    // authenticated Library (msg.sender) Calls to pass through Endpoint to UA (dstAddress)
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external override receiveNonReentrant {
        // assert and increment the nonce. no message shuffling
        require(_nonce == ++inboundNonce[_srcChainId][_srcAddress], "LayerZero: wrong nonce");
        LibraryConfig storage uaConfig = uaConfigLookup[_dstAddress];
        // authentication to prevent cross-version message validation
        // protects against a malicious library from passing arbitrary data
        if (uaConfig.receiveVersion == DEFAULT_VERSION) {
            require(defaultReceiveLibraryAddress == msg.sender, "LayerZero: invalid default library");
        } else {
            require(uaConfig.receiveLibraryAddress == msg.sender, "LayerZero: invalid library");
        }
        // block if any message blocking
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        require(sp.payloadHash == bytes32(0), "LayerZero: in message blocking");
        try ILayerZeroReceiver(_dstAddress).lzReceive{gas: _gasLimit}(_srcChainId, _srcAddress, _nonce, _payload) {
            // success, do nothing, end of the message delivery
        } catch (bytes memory reason) {
            // revert nonce if any uncaught errors/exceptions if the ua chooses the blocking mode
            storedPayload[_srcChainId][_srcAddress] = StoredPayload(uint64(_payload.length), _dstAddress, keccak256(_payload));
            emit PayloadStored(_srcChainId, _srcAddress, _dstAddress, _nonce, _payload, reason);
        }
    }
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external override receiveNonReentrant {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        require(sp.payloadHash != bytes32(0), "LayerZero: no stored payload");
        require(_payload.length == sp.payloadLength && keccak256(_payload) == sp.payloadHash, "LayerZero: invalid payload");
        address dstAddress = sp.dstAddress;
        // empty the storedPayload
        sp.payloadLength = 0;
        sp.dstAddress = address(0);
        sp.payloadHash = bytes32(0);
        uint64 nonce = inboundNonce[_srcChainId][_srcAddress];
        ILayerZeroReceiver(dstAddress).lzReceive(_srcChainId, _srcAddress, nonce, _payload);
        emit PayloadCleared(_srcChainId, _srcAddress, nonce, dstAddress);
    }
    //---------------------------------------------------------------------------
    // Owner Calls, only new library version upgrade (3 steps)
    // note libraryLookup[0] = 0x0, no library implementation
    // LIBRARY UPGRADE step 1: set _newLayerZeroLibraryAddress be the new version
    function newVersion(address _newLayerZeroLibraryAddress) external onlyOwner {
        require(_newLayerZeroLibraryAddress != address(0x0), "LayerZero: new version cannot be zero address");
        require(latestVersion < 65535, "LayerZero: can not add new messaging library");
        latestVersion++;
        libraryLookup[latestVersion] = ILayerZeroMessagingLibrary(_newLayerZeroLibraryAddress);
        emit NewLibraryVersionAdded(latestVersion);
    }
    // LIBRARY UPGRADE step 2: stop sending messages from the old version
    function setDefaultSendVersion(uint16 _newDefaultSendVersion) external onlyOwner validVersion(_newDefaultSendVersion) {
        require(_newDefaultSendVersion != DEFAULT_VERSION, "LayerZero: default send version must > 0");
        defaultSendVersion = _newDefaultSendVersion;
        defaultSendLibrary = libraryLookup[defaultSendVersion];
        emit DefaultSendVersionSet(_newDefaultSendVersion);
    }
    // LIBRARY UPGRADE step 3: stop receiving messages from the old version
    function setDefaultReceiveVersion(uint16 _newDefaultReceiveVersion) external onlyOwner validVersion(_newDefaultReceiveVersion) {
        require(_newDefaultReceiveVersion != DEFAULT_VERSION, "LayerZero: default receive version must > 0");
        defaultReceiveVersion = _newDefaultReceiveVersion;
        defaultReceiveLibraryAddress = address(libraryLookup[defaultReceiveVersion]);
        emit DefaultReceiveVersionSet(_newDefaultReceiveVersion);
    }
    //---------------------------------------------------------------------------
    // User Application Calls - UA set/get Interface
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external override validVersion(_version) {
        if (_version == DEFAULT_VERSION) {
            require(defaultSendVersion == defaultReceiveVersion, "LayerZero: can not set Config during DEFAULT migration");
            _version = defaultSendVersion;
        }
        require(_version != BLOCK_VERSION, "LayerZero: can not set config for BLOCK_VERSION");
        libraryLookup[_version].setConfig(_chainId, msg.sender, _configType, _config);
    }
    // Migration step 1: set the send version
    // Define what library the UA points too
    function setSendVersion(uint16 _newVersion) external override validVersion(_newVersion) {
        // write into config
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uaConfig.sendVersion = _newVersion;
        // the libraryLookup[BLOCK_VERSION || DEFAULT_VERSION] = 0x0
        uaConfig.sendLibrary = libraryLookup[_newVersion];
        emit UaSendVersionSet(msg.sender, _newVersion);
    }
    // Migration step 2: set the receive version
    // after all messages sent from the old version are received
    // the UA can now safely switch to the new receive version
    // it is the UA's responsibility make sure all messages from the old version are processed
    function setReceiveVersion(uint16 _newVersion) external override validVersion(_newVersion) {
        // write into config
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uaConfig.receiveVersion = _newVersion;
        // the libraryLookup[BLOCK_VERSION || DEFAULT_VERSION] = 0x0
        uaConfig.receiveLibraryAddress = address(libraryLookup[_newVersion]);
        emit UaReceiveVersionSet(msg.sender, _newVersion);
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        // revert if no messages are cached. safeguard malicious UA behaviour
        require(sp.payloadHash != bytes32(0), "LayerZero: no stored payload");
        require(sp.dstAddress == msg.sender, "LayerZero: invalid caller");
        // empty the storedPayload
        sp.payloadLength = 0;
        sp.dstAddress = address(0);
        sp.payloadHash = bytes32(0);
        // emit the event with the new nonce
        emit UaForceResumeReceive(_srcChainId, _srcAddress);
    }
    //---------------------------------------------------------------------------
    // view helper function
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParams) external view override returns (uint nativeFee, uint zroFee) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        ILayerZeroMessagingLibrary lib = uaConfig.sendVersion == DEFAULT_VERSION ? defaultSendLibrary : uaConfig.sendLibrary;
        return lib.estimateFees(_dstChainId, _userApplication, _payload, _payInZRO, _adapterParams);
    }
    function _getSendLibrary(LibraryConfig storage uaConfig) internal view returns (ILayerZeroMessagingLibrary) {
        if (uaConfig.sendVersion == DEFAULT_VERSION) {
            // check if the in send-blocking upgrade
            require(defaultSendVersion != BLOCK_VERSION, "LayerZero: default in BLOCK_VERSION");
            return defaultSendLibrary;
        } else {
            // check if the in send-blocking upgrade
            require(uaConfig.sendVersion != BLOCK_VERSION, "LayerZero: in BLOCK_VERSION");
            return uaConfig.sendLibrary;
        }
    }
    function getSendLibraryAddress(address _userApplication) external view override returns (address sendLibraryAddress) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        uint16 sendVersion = uaConfig.sendVersion;
        require(sendVersion != BLOCK_VERSION, "LayerZero: send version is BLOCK_VERSION");
        if (sendVersion == DEFAULT_VERSION) {
            require(defaultSendVersion != BLOCK_VERSION, "LayerZero: send version (default) is BLOCK_VERSION");
            sendLibraryAddress = address(defaultSendLibrary);
        } else {
            sendLibraryAddress = address(uaConfig.sendLibrary);
        }
    }
    function getReceiveLibraryAddress(address _userApplication) external view override returns (address receiveLibraryAddress) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        uint16 receiveVersion = uaConfig.receiveVersion;
        require(receiveVersion != BLOCK_VERSION, "LayerZero: receive version is BLOCK_VERSION");
        if (receiveVersion == DEFAULT_VERSION) {
            require(defaultReceiveVersion != BLOCK_VERSION, "LayerZero: receive version (default) is BLOCK_VERSION");
            receiveLibraryAddress = defaultReceiveLibraryAddress;
        } else {
            receiveLibraryAddress = uaConfig.receiveLibraryAddress;
        }
    }
    function isSendingPayload() external view override returns (bool) {
        return _send_entered_state == _ENTERED;
    }
    function isReceivingPayload() external view override returns (bool) {
        return _receive_entered_state == _ENTERED;
    }
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view override returns (uint64) {
        return inboundNonce[_srcChainId][_srcAddress];
    }
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view override returns (uint64) {
        return outboundNonce[_dstChainId][_srcAddress];
    }
    function getChainId() external view override returns (uint16) {
        return chainId;
    }
    function getSendVersion(address _userApplication) external view override returns (uint16) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        return uaConfig.sendVersion == DEFAULT_VERSION ? defaultSendVersion : uaConfig.sendVersion;
    }
    function getReceiveVersion(address _userApplication) external view override returns (uint16) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        return uaConfig.receiveVersion == DEFAULT_VERSION ? defaultReceiveVersion : uaConfig.receiveVersion;
    }
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view override validVersion(_version) returns (bytes memory) {
        if (_version == DEFAULT_VERSION) {
            require(defaultSendVersion == defaultReceiveVersion, "LayerZero: no DEFAULT config while migration");
            _version = defaultSendVersion;
        }
        require(_version != BLOCK_VERSION, "LayerZero: can not get config for BLOCK_VERSION");
        return libraryLookup[_version].getConfig(_chainId, _userApplication, _configType);
    }
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view override returns (bool) {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        return sp.payloadHash != bytes32(0);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.7.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroMessagingLibrary {
    // send(), messages will be inflight.
    function send(address _userApplication, uint64 _lastNonce, uint16 _chainId, bytes calldata _destination, bytes calldata _payload, address payable refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // estimate native fee at the send side
    function estimateFees(uint16 _chainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    //---------------------------------------------------------------------------
    // setConfig / getConfig are User Application (UA) functions to specify Oracle, Relayer, blockConfirmations, libraryVersion
    function setConfig(uint16 _chainId, address _userApplication, uint _configType, bytes calldata _config) external;
    function getConfig(uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.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 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
import "./Router.sol";
// interfaces
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroReceiver.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroEndpoint.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroUserApplicationConfig.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Bridge is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_SWAP_REMOTE = 1;
    uint8 internal constant TYPE_ADD_LIQUIDITY = 2;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALL_BACK = 3;
    uint8 internal constant TYPE_WITHDRAW_REMOTE = 4;
    //---------------------------------------------------------------------------
    // VARIABLES
    ILayerZeroEndpoint public immutable layerZeroEndpoint;
    mapping(uint16 => bytes) public bridgeLookup;
    mapping(uint16 => mapping(uint8 => uint256)) public gasLookup;
    Router public immutable router;
    bool public useLayerZeroToken;
    //---------------------------------------------------------------------------
    // EVENTS
    event SendMsg(uint8 msgType, uint64 nonce);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == address(router), "Stargate: caller must be Router.");
        _;
    }
    constructor(address _layerZeroEndpoint, address _router) {
        require(_layerZeroEndpoint != address(0x0), "Stargate: _layerZeroEndpoint cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        layerZeroEndpoint = ILayerZeroEndpoint(_layerZeroEndpoint);
        router = Router(_router);
    }
    //---------------------------------------------------------------------------
    // EXTERNAL functions
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) external override {
        require(msg.sender == address(layerZeroEndpoint), "Stargate: only LayerZero endpoint can call lzReceive");
        require(
            _srcAddress.length == bridgeLookup[_srcChainId].length && keccak256(_srcAddress) == keccak256(bridgeLookup[_srcChainId]),
            "Stargate: bridge does not match"
        );
        uint8 functionType;
        assembly {
            functionType := mload(add(_payload, 32))
        }
        if (functionType == TYPE_SWAP_REMOTE) {
            (
                ,
                uint256 srcPoolId,
                uint256 dstPoolId,
                uint256 dstGasForCall,
                Pool.CreditObj memory c,
                Pool.SwapObj memory s,
                bytes memory to,
                bytes memory payload
            ) = abi.decode(_payload, (uint8, uint256, uint256, uint256, Pool.CreditObj, Pool.SwapObj, bytes, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, toAddress, s, payload);
        } else if (functionType == TYPE_ADD_LIQUIDITY) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c) = abi.decode(_payload, (uint8, uint256, uint256, Pool.CreditObj));
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
        } else if (functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi
                .decode(_payload, (uint8, uint256, uint256, Pool.CreditObj, uint256, uint256, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, toAddress, amountSD, mintAmountSD);
        } else if (functionType == TYPE_WITHDRAW_REMOTE) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, Pool.CreditObj, uint256, bytes)
            );
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCheckOnRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, amountSD, to);
        }
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function swap(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        Pool.SwapObj memory _s,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_SWAP_REMOTE, _srcPoolId, _dstPoolId, _lzTxParams.dstGasForCall, _c, _s, _to, _payload);
        _call(_chainId, TYPE_SWAP_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocalCallback(
        uint16 _chainId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) external payable onlyRouter {
        bytes memory payload;
        {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, uint256, uint256, bytes)
            );
            // swap dst and src because we are headed back
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, dstPoolId, srcPoolId, _c, amountSD, mintAmountSD, to);
        }
        _call(_chainId, TYPE_REDEEM_LOCAL_CALL_BACK, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocal(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        uint256 _amountSD,
        bytes calldata _to,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_WITHDRAW_REMOTE, _srcPoolId, _dstPoolId, _c, _amountSD, _to);
        _call(_chainId, TYPE_WITHDRAW_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function sendCredits(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_ADD_LIQUIDITY, _srcPoolId, _dstPoolId, _c);
        IStargateRouter.lzTxObj memory lzTxObj = IStargateRouter.lzTxObj(0, 0, "0x");
        _call(_chainId, TYPE_ADD_LIQUIDITY, _refundAddress, lzTxObj, payload);
    }
    function quoteLayerZeroFee(
        uint16 _chainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256) {
        bytes memory payload = "";
        Pool.CreditObj memory c = Pool.CreditObj(1, 1);
        if (_functionType == TYPE_SWAP_REMOTE) {
            Pool.SwapObj memory s = Pool.SwapObj(1, 1, 1, 1, 1, 1);
            payload = abi.encode(TYPE_SWAP_REMOTE, 0, 0, 0, c, s, _toAddress, _transferAndCallPayload);
        } else if (_functionType == TYPE_ADD_LIQUIDITY) {
            payload = abi.encode(TYPE_ADD_LIQUIDITY, 0, 0, c);
        } else if (_functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, 0, 0, c, 0, 0, _toAddress);
        } else if (_functionType == TYPE_WITHDRAW_REMOTE) {
            payload = abi.encode(TYPE_WITHDRAW_REMOTE, 0, 0, c, 0, _toAddress);
        } else {
            revert("Stargate: unsupported function type");
        }
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _functionType, _lzTxParams);
        return layerZeroEndpoint.estimateFees(_chainId, address(this), payload, useLayerZeroToken, lzTxParamBuilt);
    }
    //---------------------------------------------------------------------------
    // dao functions
    function setBridge(uint16 _chainId, bytes calldata _bridgeAddress) external onlyOwner {
        require(bridgeLookup[_chainId].length == 0, "Stargate: Bridge already set!");
        bridgeLookup[_chainId] = _bridgeAddress;
    }
    function setGasAmount(
        uint16 _chainId,
        uint8 _functionType,
        uint256 _gasAmount
    ) external onlyOwner {
        require(_functionType >= 1 && _functionType <= 4, "Stargate: invalid _functionType");
        gasLookup[_chainId][_functionType] = _gasAmount;
    }
    function approveTokenSpender(
        address token,
        address spender,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).approve(spender, amount);
    }
    function setUseLayerZeroToken(bool enable) external onlyOwner {
        useLayerZeroToken = enable;
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        layerZeroEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }
    //---------------------------------------------------------------------------
    // generic config for user Application
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint256 _configType,
        bytes calldata _config
    ) external override onlyOwner {
        layerZeroEndpoint.setConfig(_version, _chainId, _configType, _config);
    }
    function setSendVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setSendVersion(version);
    }
    function setReceiveVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setReceiveVersion(version);
    }
    //---------------------------------------------------------------------------
    // INTERNAL functions
    function txParamBuilderType1(uint256 _gasAmount) internal pure returns (bytes memory) {
        uint16 txType = 1;
        return abi.encodePacked(txType, _gasAmount);
    }
    function txParamBuilderType2(
        uint256 _gasAmount,
        uint256 _dstNativeAmount,
        bytes memory _dstNativeAddr
    ) internal pure returns (bytes memory) {
        uint16 txType = 2;
        return abi.encodePacked(txType, _gasAmount, _dstNativeAmount, _dstNativeAddr);
    }
    function _txParamBuilder(
        uint16 _chainId,
        uint8 _type,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) internal view returns (bytes memory) {
        bytes memory lzTxParam;
        address dstNativeAddr;
        {
            bytes memory dstNativeAddrBytes = _lzTxParams.dstNativeAddr;
            assembly {
                dstNativeAddr := mload(add(dstNativeAddrBytes, 20))
            }
        }
        uint256 totalGas = gasLookup[_chainId][_type].add(_lzTxParams.dstGasForCall);
        if (_lzTxParams.dstNativeAmount > 0 && dstNativeAddr != address(0x0)) {
            lzTxParam = txParamBuilderType2(totalGas, _lzTxParams.dstNativeAmount, _lzTxParams.dstNativeAddr);
        } else {
            lzTxParam = txParamBuilderType1(totalGas);
        }
        return lzTxParam;
    }
    function _call(
        uint16 _chainId,
        uint8 _type,
        address payable _refundAddress,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) internal {
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _type, _lzTxParams);
        uint64 nextNonce = layerZeroEndpoint.getOutboundNonce(_chainId, address(this)) + 1;
        layerZeroEndpoint.send{value: msg.value}(_chainId, bridgeLookup[_chainId], _payload, _refundAddress, address(this), lzTxParamBuilt);
        emit SendMsg(_type, nextNonce);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.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 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./Factory.sol";
import "./Pool.sol";
import "./Bridge.sol";
// interfaces
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/IStargateRouter.sol";
import "./interfaces/IStargateReceiver.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Router is IStargateRouter, Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_REDEEM_LOCAL_RESPONSE = 1;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALLBACK_RETRY = 2;
    uint8 internal constant TYPE_SWAP_REMOTE_RETRY = 3;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct CachedSwap {
        address token;
        uint256 amountLD;
        address to;
        bytes payload;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    Factory public factory; // used for creating pools
    address public protocolFeeOwner; // can call methods to pull Stargate fees collected in pools
    address public mintFeeOwner; // can call methods to pull mint fees collected in pools
    Bridge public bridge;
    mapping(uint16 => mapping(bytes => mapping(uint256 => bytes))) public revertLookup; //[chainId][srcAddress][nonce]
    mapping(uint16 => mapping(bytes => mapping(uint256 => CachedSwap))) public cachedSwapLookup; //[chainId][srcAddress][nonce]
    //---------------------------------------------------------------------------
    // EVENTS
    event Revert(uint8 bridgeFunctionType, uint16 chainId, bytes srcAddress, uint256 nonce);
    event CachedSwapSaved(uint16 chainId, bytes srcAddress, uint256 nonce, address token, uint256 amountLD, address to, bytes payload, bytes reason);
    event RevertRedeemLocal(uint16 srcChainId, uint256 _srcPoolId, uint256 _dstPoolId, bytes to, uint256 redeemAmountSD, uint256 mintAmountSD, uint256 indexed nonce, bytes indexed srcAddress);
    event RedeemLocalCallback(uint16 srcChainId, bytes indexed srcAddress, uint256 indexed nonce, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyBridge() {
        require(msg.sender == address(bridge), "Bridge: caller must be Bridge.");
        _;
    }
    constructor() {}
    function setBridgeAndFactory(Bridge _bridge, Factory _factory) external onlyOwner {
        require(address(bridge) == address(0x0) && address(factory) == address(0x0), "Stargate: bridge and factory already initialized"); // 1 time only
        require(address(_bridge) != address(0x0), "Stargate: bridge cant be 0x0");
        require(address(_factory) != address(0x0), "Stargate: factory cant be 0x0");
        bridge = _bridge;
        factory = _factory;
    }
    //---------------------------------------------------------------------------
    // VIEWS
    function _getPool(uint256 _poolId) internal view returns (Pool pool) {
        pool = factory.getPool(_poolId);
        require(address(pool) != address(0x0), "Stargate: Pool does not exist");
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    function _safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) private {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FROM_FAILED");
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external override nonReentrant {
        Pool pool = _getPool(_poolId);
        uint256 convertRate = pool.convertRate();
        _amountLD = _amountLD.div(convertRate).mul(convertRate);
        _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
        pool.mint(_to, _amountLD);
    }
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable override nonReentrant {
        require(_amountLD > 0, "Stargate: cannot swap 0");
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            {
                uint256 convertRate = pool.convertRate();
                _amountLD = _amountLD.div(convertRate).mul(convertRate);
            }
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, _amountLD, _minAmountLD, true);
            _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, _payload);
    }
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        require(_amountLP > 0, "Stargate: not enough lp to redeemRemote");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            uint256 amountLD = pool.amountLPtoLD(_amountLP);
            // perform a swap with no liquidity
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, amountLD, _minAmountLD, false);
            pool.redeemRemote(_dstChainId, _dstPoolId, msg.sender, _amountLP);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        // equal to a swap, with no payload ("0x") no dstGasForCall 0
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, "");
    }
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external override nonReentrant returns (uint256 amountSD) {
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        Pool pool = _getPool(_srcPoolId);
        amountSD = pool.instantRedeemLocal(msg.sender, _amountLP, _to);
    }
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        uint256 amountSD = pool.redeemLocal(msg.sender, _amountLP, _dstChainId, _dstPoolId, _to);
        require(amountSD > 0, "Stargate: not enough lp to redeem with amountSD");
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.redeemLocal{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, amountSD, _to, _lzTxParams);
    }
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.sendCredits{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c);
    }
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        Router.lzTxObj memory _lzTxParams
    ) external view override returns (uint256, uint256) {
        return bridge.quoteLayerZeroFee(_dstChainId, _functionType, _toAddress, _transferAndCallPayload, _lzTxParams);
    }
    function revertRedeemLocal(
        uint16 _dstChainId,
        bytes calldata _srcAddress,
        uint256 _nonce,
        address payable _refundAddress,
        lzTxObj memory _lzTxParams
    ) external payable {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        bytes memory payload = revertLookup[_dstChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        {
            uint8 functionType;
            assembly {
                functionType := mload(add(payload, 32))
            }
            require(functionType == TYPE_REDEEM_LOCAL_RESPONSE, "Stargate: invalid function type");
        }
        // empty it
        revertLookup[_dstChainId][_srcAddress][_nonce] = "";
        uint256 srcPoolId;
        uint256 dstPoolId;
        assembly {
            srcPoolId := mload(add(payload, 64))
            dstPoolId := mload(add(payload, 96))
        }
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(dstPoolId);
            c = pool.sendCredits(_dstChainId, srcPoolId);
        }
        bridge.redeemLocalCallback{value: msg.value}(_dstChainId, _refundAddress, c, _lzTxParams, payload);
    }
    function retryRevert(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external payable {
        bytes memory payload = revertLookup[_srcChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        // empty it
        revertLookup[_srcChainId][_srcAddress][_nonce] = "";
        uint8 functionType;
        assembly {
            functionType := mload(add(payload, 32))
        }
        if (functionType == TYPE_REDEEM_LOCAL_CALLBACK_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD) = abi.decode(
                payload,
                (uint8, uint256, uint256, address, uint256, uint256)
            );
            _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, to, amountSD, mintAmountSD);
        }
        // for retrying the swapRemote. if it fails again, retry
        else if (functionType == TYPE_SWAP_REMOTE_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 dstGasForCall, address to, Pool.SwapObj memory s, bytes memory p) = abi.decode(
                payload,
                (uint8, uint256, uint256, uint256, address, Pool.SwapObj, bytes)
            );
            _swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, to, s, p);
        } else {
            revert("Stargate: invalid function type");
        }
    }
    function clearCachedSwap(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external {
        CachedSwap memory cs = cachedSwapLookup[_srcChainId][_srcAddress][_nonce];
        require(cs.to != address(0x0), "Stargate: cache already cleared");
        // clear the data
        cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(address(0x0), 0, address(0x0), "");
        IStargateReceiver(cs.to).sgReceive(_srcChainId, _srcAddress, _nonce, cs.token, cs.amountLD, cs.payload);
    }
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _srcPoolId,
        Pool.CreditObj memory _c
    ) external onlyBridge {
        Pool pool = _getPool(_srcPoolId);
        pool.creditChainPath(_dstChainId, _dstPoolId, _c);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _amountSD,
        bytes calldata _to
    ) external onlyBridge {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCheckOnRemote(_srcChainId, _srcPoolId, _amountSD) returns (uint256 redeemAmountSD, uint256 mintAmountSD) {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_RESPONSE,
                _srcPoolId,
                _dstPoolId,
                redeemAmountSD,
                mintAmountSD,
                _to
            );
            emit RevertRedeemLocal(_srcChainId, _srcPoolId, _dstPoolId, _to, redeemAmountSD, mintAmountSD, _nonce, _srcAddress);
        } catch {
            // if the func fail, return [swapAmount: 0, mintAMount: _amountSD]
            // swapAmount represents the amount of chainPath balance deducted on the remote side, which because the above tx failed, should be 0
            // mintAmount is the full amount of tokens the user attempted to redeem on the src side, which gets converted back into the lp amount
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(TYPE_REDEEM_LOCAL_RESPONSE, _srcPoolId, _dstPoolId, 0, _amountSD, _to);
            emit Revert(TYPE_REDEEM_LOCAL_RESPONSE, _srcChainId, _srcAddress, _nonce);
        }
    }
    function redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) external onlyBridge {
        _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function _redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCallback(_srcChainId, _srcPoolId, _to, _amountSD, _mintAmountSD) {} catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_CALLBACK_RETRY,
                _srcPoolId,
                _dstPoolId,
                _to,
                _amountSD,
                _mintAmountSD
            );
            emit Revert(TYPE_REDEEM_LOCAL_CALLBACK_RETRY, _srcChainId, _srcAddress, _nonce);
        }
        emit RedeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) external onlyBridge {
        _swapRemote(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _dstGasForCall, _to, _s, _payload);
    }
    function _swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        // first try catch the swap remote
        try pool.swapRemote(_srcChainId, _srcPoolId, _to, _s) returns (uint256 amountLD) {
            if (_payload.length > 0) {
                // then try catch the external contract call
                try IStargateReceiver(_to).sgReceive{gas: _dstGasForCall}(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _payload) {
                    // do nothing
                } catch (bytes memory reason) {
                    cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(pool.token(), amountLD, _to, _payload);
                    emit CachedSwapSaved(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _to, _payload, reason);
                }
            }
        } catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_SWAP_REMOTE_RETRY,
                _srcPoolId,
                _dstPoolId,
                _dstGasForCall,
                _to,
                _s,
                _payload
            );
            emit Revert(TYPE_SWAP_REMOTE_RETRY, _srcChainId, _srcAddress, _nonce);
        }
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) external onlyOwner returns (address) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        return factory.createPool(_poolId, _token, _sharedDecimals, _localDecimals, _name, _symbol);
    }
    function createChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.createChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function activateChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.activateChainPath(_dstChainId, _dstPoolId);
    }
    function setWeightForChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setWeightForChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function setProtocolFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        protocolFeeOwner = _owner;
    }
    function setMintFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        mintFeeOwner = _owner;
    }
    function setFees(uint256 _poolId, uint256 _mintFeeBP) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFee(_mintFeeBP);
    }
    function setFeeLibrary(uint256 _poolId, address _feeLibraryAddr) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFeeLibrary(_feeLibraryAddr);
    }
    function setSwapStop(uint256 _poolId, bool _swapStop) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setSwapStop(_swapStop);
    }
    function setDeltaParam(
        uint256 _poolId,
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setDeltaParam(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(uint256 _poolId, bool _fullMode) external {
        Pool pool = _getPool(_poolId);
        pool.callDelta(_fullMode);
    }
    function withdrawMintFee(uint256 _poolId, address _to) external {
        require(mintFeeOwner == msg.sender, "Stargate: only mintFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawMintFeeBalance(_to);
    }
    function withdrawProtocolFee(uint256 _poolId, address _to) external {
        require(protocolFeeOwner == msg.sender, "Stargate: only protocolFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawProtocolFeeBalance(_to);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. ie: pay for a specified destination gasAmount, or receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
contract Factory is Ownable {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    mapping(uint256 => Pool) public getPool; // poolId -> PoolInfo
    address[] public allPools;
    address public immutable router;
    address public defaultFeeLibrary; // address for retrieving fee params for swaps
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: caller must be Router.");
        _;
    }
    constructor(address _router) {
        require(_router != address(0x0), "Stargate: _router cant be 0x0"); // 1 time only
        router = _router;
    }
    function setDefaultFeeLibrary(address _defaultFeeLibrary) external onlyOwner {
        require(_defaultFeeLibrary != address(0x0), "Stargate: fee library cant be 0x0");
        defaultFeeLibrary = _defaultFeeLibrary;
    }
    function allPoolsLength() external view returns (uint256) {
        return allPools.length;
    }
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) public onlyRouter returns (address poolAddress) {
        require(address(getPool[_poolId]) == address(0x0), "Stargate: Pool already created");
        Pool pool = new Pool(_poolId, router, _token, _sharedDecimals, _localDecimals, defaultFeeLibrary, _name, _symbol);
        getPool[_poolId] = pool;
        poolAddress = address(pool);
        allPools.push(poolAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
interface IStargateReceiver {
    function sgReceive(
        uint16 _chainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        address _token,
        uint256 amountLD,
        bytes memory payload
    ) external;
}