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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

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

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

pragma solidity ^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 meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Gas optimized ECDSA wrapper.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ECDSA.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/ECDSA.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/ECDSA.sol)
library ECDSA {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        CUSTOM ERRORS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The signature is invalid.
    error InvalidSignature();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         CONSTANTS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The number which `s` must not exceed in order for
    /// the signature to be non-malleable.
    bytes32 private constant _MALLEABILITY_THRESHOLD =
        0x7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                    RECOVERY OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // Note: as of Solady version 0.0.68, these functions will
    // revert upon recovery failure for more safety by default.

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function recover(bytes32 hash, bytes memory signature) internal view returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // Copy `r` and `s`.
            mstore(0x40, mload(add(signature, 0x20))) // `r`.
            let s := mload(add(signature, 0x40))
            mstore(0x60, s)
            // Store the `hash` in the scratch space.
            mstore(0x00, hash)
            // Compute `v` and store it in the scratch space.
            mstore(0x20, byte(0, mload(add(signature, 0x60))))
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    and(
                        // If the signature is exactly 65 bytes in length.
                        eq(mload(signature), 65),
                        // If `s` in lower half order, such that the signature is not malleable.
                        lt(s, add(_MALLEABILITY_THRESHOLD, 1))
                    ), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function recoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // Directly copy `r` and `s` from the calldata.
            calldatacopy(0x40, signature.offset, 0x40)
            // Store the `hash` in the scratch space.
            mstore(0x00, hash)
            // Compute `v` and store it in the scratch space.
            mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40))))
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    and(
                        // If the signature is exactly 65 bytes in length.
                        eq(signature.length, 65),
                        // If `s` in lower half order, such that the signature is not malleable.
                        lt(mload(0x60), add(_MALLEABILITY_THRESHOLD, 1))
                    ), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    ///
    /// This function only accepts EIP-2098 short form signatures.
    /// See: https://eips.ethereum.org/EIPS/eip-2098
    ///
    /// To be honest, I do not recommend using EIP-2098 signatures
    /// for simplicity, performance, and security reasons. Most if not
    /// all clients support traditional non EIP-2098 signatures by default.
    /// As such, this method is intentionally not fully inlined.
    /// It is merely included for completeness.
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal view returns (address result) {
        uint8 v;
        bytes32 s;
        /// @solidity memory-safe-assembly
        assembly {
            s := shr(1, shl(1, vs))
            v := add(shr(255, vs), 27)
        }
        result = recover(hash, v, r, s);
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            mstore(0x00, hash)
            mstore(0x20, and(v, 0xff))
            mstore(0x40, r)
            mstore(0x60, s)
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    // If `s` in lower half order, such that the signature is not malleable.
                    lt(s, add(_MALLEABILITY_THRESHOLD, 1)), // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x00, // Start of output.
                    0x20 // Size of output.
                )
            )
            result := mload(0x00)
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                // Store the function selector of `InvalidSignature()`.
                mstore(0x00, 0x8baa579f)
                // Revert with (offset, size).
                revert(0x1c, 0x04)
            }
            // Restore the zero slot.
            mstore(0x60, 0)
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   TRY-RECOVER OPERATIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // WARNING!
    // These functions will NOT revert upon recovery failure.
    // Instead, they will return the zero address upon recovery failure.
    // It is critical that the returned address is NEVER compared against
    // a zero address (e.g. an uninitialized address variable).

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function tryRecover(bytes32 hash, bytes memory signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(xor(mload(signature), 65)) {
                // Copy the free memory pointer so that we can restore it later.
                let m := mload(0x40)
                // Copy `r` and `s`.
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                let s := mload(add(signature, 0x40))
                mstore(0x60, s)
                // If `s` in lower half order, such that the signature is not malleable.
                if iszero(gt(s, _MALLEABILITY_THRESHOLD)) {
                    // Store the `hash` in the scratch space.
                    mstore(0x00, hash)
                    // Compute `v` and store it in the scratch space.
                    mstore(0x20, byte(0, mload(add(signature, 0x60))))
                    pop(
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            0x01, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x40, // Start of output.
                            0x20 // Size of output.
                        )
                    )
                    // Restore the zero slot.
                    mstore(0x60, 0)
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    result := mload(xor(0x60, returndatasize()))
                }
                // Restore the free memory pointer.
                mstore(0x40, m)
            }
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the `signature`.
    ///
    /// This function does NOT accept EIP-2098 short form signatures.
    /// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
    /// short form signatures instead.
    function tryRecoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(xor(signature.length, 65)) {
                // Copy the free memory pointer so that we can restore it later.
                let m := mload(0x40)
                // Directly copy `r` and `s` from the calldata.
                calldatacopy(0x40, signature.offset, 0x40)
                // If `s` in lower half order, such that the signature is not malleable.
                if iszero(gt(mload(0x60), _MALLEABILITY_THRESHOLD)) {
                    // Store the `hash` in the scratch space.
                    mstore(0x00, hash)
                    // Compute `v` and store it in the scratch space.
                    mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40))))
                    pop(
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            0x01, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x40, // Start of output.
                            0x20 // Size of output.
                        )
                    )
                    // Restore the zero slot.
                    mstore(0x60, 0)
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    result := mload(xor(0x60, returndatasize()))
                }
                // Restore the free memory pointer.
                mstore(0x40, m)
            }
        }
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    ///
    /// This function only accepts EIP-2098 short form signatures.
    /// See: https://eips.ethereum.org/EIPS/eip-2098
    ///
    /// To be honest, I do not recommend using EIP-2098 signatures
    /// for simplicity, performance, and security reasons. Most if not
    /// all clients support traditional non EIP-2098 signatures by default.
    /// As such, this method is intentionally not fully inlined.
    /// It is merely included for completeness.
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (address result)
    {
        uint8 v;
        bytes32 s;
        /// @solidity memory-safe-assembly
        assembly {
            s := shr(1, shl(1, vs))
            v := add(shr(255, vs), 27)
        }
        result = tryRecover(hash, v, r, s);
    }

    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Copy the free memory pointer so that we can restore it later.
            let m := mload(0x40)
            // If `s` in lower half order, such that the signature is not malleable.
            if iszero(gt(s, _MALLEABILITY_THRESHOLD)) {
                // Store the `hash`, `v`, `r`, `s` in the scratch space.
                mstore(0x00, hash)
                mstore(0x20, and(v, 0xff))
                mstore(0x40, r)
                mstore(0x60, s)
                pop(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        0x01, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x40, // Start of output.
                        0x20 // Size of output.
                    )
                )
                // Restore the zero slot.
                mstore(0x60, 0)
                // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                result := mload(xor(0x60, returndatasize()))
            }
            // Restore the free memory pointer.
            mstore(0x40, m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HASHING OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns an Ethereum Signed Message, created from a `hash`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Store into scratch space for keccak256.
            mstore(0x20, hash)
            mstore(0x00, "\x00\x00\x00\x00\x19Ethereum Signed Message:\n32")
            // 0x40 - 0x04 = 0x3c
            result := keccak256(0x04, 0x3c)
        }
    }

    /// @dev Returns an Ethereum Signed Message, created from `s`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32 result) {
        assembly {
            // The length of "\x19Ethereum Signed Message:\n" is 26 bytes (i.e. 0x1a).
            // If we reserve 2 words, we'll have 64 - 26 = 38 bytes to store the
            // ASCII decimal representation of the length of `s` up to about 2 ** 126.

            // Instead of allocating, we temporarily copy the 64 bytes before the
            // start of `s` data to some variables.
            let m := mload(sub(s, 0x20))
            // The length of `s` is in bytes.
            let sLength := mload(s)
            let ptr := add(s, 0x20)
            let w := not(0)
            // `end` marks the end of the memory which we will compute the keccak256 of.
            let end := add(ptr, sLength)
            // Convert the length of the bytes to ASCII decimal representation
            // and store it into the memory.
            for { let temp := sLength } 1 {} {
                ptr := add(ptr, w) // `sub(ptr, 1)`.
                mstore8(ptr, add(48, mod(temp, 10)))
                temp := div(temp, 10)
                if iszero(temp) { break }
            }
            // Copy the header over to the memory.
            mstore(sub(ptr, 0x20), "\x00\x00\x00\x00\x00\x00\x19Ethereum Signed Message:\n")
            // Compute the keccak256 of the memory.
            result := keccak256(sub(ptr, 0x1a), sub(end, sub(ptr, 0x1a)))
            // Restore the previous memory.
            mstore(s, sLength)
            mstore(sub(s, 0x20), m)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   EMPTY CALLDATA HELPERS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns an empty calldata bytes.
    function emptySignature() internal pure returns (bytes calldata signature) {
        /// @solidity memory-safe-assembly
        assembly {
            signature.length := 0
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;

import {IERC165} from "openzeppelin/utils/introspection/IERC165.sol";
import {IERC721} from "openzeppelin/token/ERC721/IERC721.sol";
import {IERC721Metadata} from "openzeppelin/token/ERC721/extensions/IERC721Metadata.sol";
import {ECDSA} from "solady/utils/ECDSA.sol";
import {Ownable} from "openzeppelin/access/Ownable.sol";

import "./NonTransferrableERC721.sol";
import "./IERC4906.sol";
import "./IFundropRewards.sol";
import "./IMetadataRenderer.sol";

contract FundropPass is NonTransferrableERC721, IERC4906, Ownable {
    address public metadataRenderer;
    address public rewardsDistributor;

    address public metadataUpdater;
    address public signer;
    bool public mintOpen;

    error InvalidSignature();
    error MintClosed();
    error OnlyOwnerOrMetadataUpdater();

    event MinterReferred(address referrer);

    constructor() NonTransferrableERC721("mint.fun !fundrop pass", "FUNPASS") {
        if (msg.sender != tx.origin) {
            transferOwnership(tx.origin);
        }
    }

    function mint(address referrer, bytes calldata signature) public {
        if (!mintOpen) revert MintClosed();
        address recovered = ECDSA.tryRecoverCalldata(keccak256(abi.encodePacked(msg.sender, referrer)), signature);
        if (recovered != signer) revert InvalidSignature();
        if (referrer != address(0)) emit MinterReferred(referrer);
        _mint(msg.sender);
    }

    function tokenURI(uint256 id) public view override returns (string memory) {
        if (!_exists(id)) revert InvalidTokenId();
        return IMetadataRenderer(metadataRenderer).tokenURI(id);
    }

    // Admin functions

    function refreshMetadata() public {
        if (msg.sender != metadataUpdater && msg.sender != owner()) {
            revert OnlyOwnerOrMetadataUpdater();
        }
        emit BatchMetadataUpdate(0, type(uint256).max);
    }

    function setMetadataRenderer(address _metadataRenderer) public onlyOwner {
        metadataRenderer = _metadataRenderer;
        refreshMetadata();
    }

    function setMetadataUpdater(address _metadataUpdater) public onlyOwner {
        metadataUpdater = _metadataUpdater;
    }

    function setSigner(address _signer) public onlyOwner {
        signer = _signer;
    }

    function setRewardsDistributor(address _rewardsDistributor) public onlyOwner {
        rewardsDistributor = _rewardsDistributor;
    }

    function setMintOpen(bool _mintOpen) public onlyOwner {
        mintOpen = _mintOpen;
    }

    function adminBurn(uint256[] calldata ids) public onlyOwner {
        for (uint256 i = 0; i < ids.length; i++) {
            _burn(ids[i]);
        }
    }

    function supportsInterface(bytes4 interfaceId) public pure virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId || interfaceId == type(IERC721).interfaceId
            || interfaceId == type(IERC4906).interfaceId || interfaceId == type(IERC721Metadata).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IERC4906 {
    /// @dev This event emits when the metadata of a token is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFT.
    event MetadataUpdate(uint256 _tokenId);

    /// @dev This event emits when the metadata of a range of tokens is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFTs.
    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.17;

interface IFundropRewards {
    function getRewardsBalance(address _minter) external view returns (uint256);
    function claimRewards(address _minter, bytes memory _args) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;

interface IMetadataRenderer {
    function tokenURI(uint256 id) external view returns (string memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;

import {IERC721} from "openzeppelin/token/ERC721/IERC721.sol";
import {IERC721Metadata} from "openzeppelin/token/ERC721/extensions/IERC721Metadata.sol";
import {IERC165} from "openzeppelin/utils/introspection/IERC165.sol";

abstract contract NonTransferrableERC721 is IERC721, IERC721Metadata {
    string public override name;
    string public override symbol;

    mapping(uint256 => address) private _owners;
    mapping(address => uint256) private _tokens;
    uint256 private _nextTokenId = 1;
    uint256 private _burnedTokenCount;

    error AlreadyMinted();
    error InvalidAddress();
    error InvalidTokenId();
    error NonTransferrable();

    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }

    function _mint(address to) internal {
        if (to == address(0)) revert InvalidAddress();
        if (_tokens[to] != 0) revert AlreadyMinted();

        unchecked {
            uint256 tokenId = _nextTokenId++;
            _owners[tokenId] = to;
            _tokens[to] = tokenId;

            emit Transfer(address(0), to, tokenId);
        }
    }

    function _burn(uint256 tokenId) internal {
        address owner = _owners[tokenId];
        if (owner == address(0)) revert InvalidTokenId();

        _owners[tokenId] = address(0);
        _tokens[owner] = 0;
        unchecked {
            _burnedTokenCount++;
        }

        emit Transfer(owner, address(0), tokenId);
    }

    function _burn(address owner) internal {
        uint256 tokenId = _tokens[owner];
        if (tokenId == 0) revert InvalidAddress();

        _owners[tokenId] = address(0);
        _tokens[owner] = 0;
        unchecked {
            _burnedTokenCount++;
        }

        emit Transfer(owner, address(0), tokenId);
    }

    function _exists(uint256 tokenId) internal view returns (bool) {
        return _owners[tokenId] != address(0);
    }

    function supportsInterface(bytes4 interfaceID) external pure virtual override returns (bool) {
        return interfaceID == type(IERC165).interfaceId || interfaceID == type(IERC721).interfaceId
            || interfaceID == type(IERC721Metadata).interfaceId;
    }

    function balanceOf(address _owner) external view override returns (uint256) {
        if (_owner == address(0)) revert InvalidAddress();
        return _tokens[_owner] > 0 ? 1 : 0;
    }

    function ownerOf(uint256 _tokenId) external view override returns (address) {
        address owner = _owners[_tokenId];
        if (owner == address(0)) revert InvalidTokenId();
        return owner;
    }

    function safeTransferFrom(address, address, uint256) external pure override {
        revert NonTransferrable();
    }

    function safeTransferFrom(address, address, uint256, bytes calldata) external pure override {
        revert NonTransferrable();
    }

    function transferFrom(address, address, uint256) external pure override {
        revert NonTransferrable();
    }

    function approve(address, uint256) external pure override {
        revert NonTransferrable();
    }

    function setApprovalForAll(address, bool) external pure override {
        revert NonTransferrable();
    }

    function getApproved(uint256) external pure override returns (address) {
        revert NonTransferrable();
    }

    function isApprovedForAll(address, address) external pure override returns (bool) {
        return false;
    }

    function totalSupply() external view returns (uint256) {
        return _nextTokenId - 1 - _burnedTokenCount;
    }
}

{
  "remappings": [
    "ERC721A/=lib/ERC721A/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "solady/=lib/solady/src/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 250000
  },
  "metadata": {
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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