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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {EIP712} from "solady-0.1.24/src/utils/EIP712.sol";
import {Ownable} from "solady-0.1.24/src/auth/Ownable.sol";
import {SafeTransferLib} from "solady-0.1.24/src/utils/ext/zksync/SafeTransferLib.sol";
import {SignatureCheckerLib} from "solady-0.1.24/src/utils/SignatureCheckerLib.sol";
import {PurchaseReservation} from "./Structs.sol";

contract OnchainPaymentHandler is EIP712, Ownable {
    using SafeTransferLib for address;

    bytes32 public constant PURCHASE_TYPEHASH =
        keccak256("Purchase(bytes32 reservationId,uint256 maxQuantity,uint256 expiration,uint256 pricePerUnit)");

    address public signer;
    address public paymentToken;
    bool public isPaused;

    mapping(bytes32 => PurchaseReservation) public reservations;

    error ReservationUsed();
    error ReservationExpired();
    error ExceedsMaxQuantity();
    error Paused();

    event Purchase(address indexed buyer, bytes32 indexed reservationId, uint256 quantity, uint256 pricePerUnit);

    constructor(address owner, address _paymentToken, address _signer) {
        _initializeOwner(owner);
        paymentToken = _paymentToken;
        signer = _signer;
    }

    function processPayment(
        bytes32 reservationId,
        address buyer,
        uint256 quantity,
        uint256 maxQuantity,
        uint256 expiration,
        uint256 pricePerUnit,
        bytes calldata signature
    ) public {
        if (isPaused) revert Paused();

        _validatePurchase(reservationId, quantity, maxQuantity, expiration, pricePerUnit, signature);

        uint256 totalAmount = quantity * pricePerUnit;
        reservations[reservationId] =
            PurchaseReservation({buyer: buyer, quantity: uint16(quantity), amount: uint80(totalAmount)});

        paymentToken.safeTransferFrom(msg.sender, address(this), totalAmount);

        emit Purchase(buyer, reservationId, quantity, pricePerUnit);
    }

    function withdraw(address token) public onlyOwner {
        token.safeTransferAll(owner());
    }

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

    function setPaused(bool _isPaused) public onlyOwner {
        isPaused = _isPaused;
    }

    function _validatePurchase(
        bytes32 reservationId,
        uint256 quantity,
        uint256 maxQuantity,
        uint256 expiration,
        uint256 pricePerUnit,
        bytes calldata signature
    ) internal virtual {
        require(reservations[reservationId].buyer == address(0), ReservationUsed());
        require(block.timestamp < expiration, ReservationExpired());
        require(quantity <= maxQuantity, ExceedsMaxQuantity());

        bytes32 digest = _hashTypedData(
            keccak256(abi.encode(PURCHASE_TYPEHASH, reservationId, maxQuantity, expiration, pricePerUnit))
        );

        require(SignatureCheckerLib.isValidSignatureNowCalldata(signer, digest, signature), "Invalid signature");
    }

    function _domainNameAndVersion() internal pure override returns (string memory, string memory) {
        return ("OnchainPaymentHandler", "1");
    }
}

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

/// @notice Contract for EIP-712 typed structured data hashing and signing.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/EIP712.sol)
/// @author Modified from Solbase (https://github.com/Sol-DAO/solbase/blob/main/src/utils/EIP712.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/EIP712.sol)
///
/// @dev Note, this implementation:
/// - Uses `address(this)` for the `verifyingContract` field.
/// - Does NOT use the optional EIP-712 salt.
/// - Does NOT use any EIP-712 extensions.
/// This is for simplicity and to save gas.
/// If you need to customize, please fork / modify accordingly.
abstract contract EIP712 {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  CONSTANTS AND IMMUTABLES                  */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev `keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")`.
    bytes32 internal constant _DOMAIN_TYPEHASH =
        0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    /// @dev `keccak256("EIP712Domain(string name,string version,address verifyingContract)")`.
    /// This is only used in `_hashTypedDataSansChainId`.
    bytes32 internal constant _DOMAIN_TYPEHASH_SANS_CHAIN_ID =
        0x91ab3d17e3a50a9d89e63fd30b92be7f5336b03b287bb946787a83a9d62a2766;

    /// @dev `keccak256("EIP712Domain(string name,string version)")`.
    /// This is only used in `_hashTypedDataSansChainIdAndVerifyingContract`.
    bytes32 internal constant _DOMAIN_TYPEHASH_SANS_CHAIN_ID_AND_VERIFYING_CONTRACT =
        0xb03948446334eb9b2196d5eb166f69b9d49403eb4a12f36de8d3f9f3cb8e15c3;

    /// @dev `keccak256("EIP712Domain(string name,string version,uint256 chainId)")`.
    /// This is only used in `_hashTypedDataSansVerifyingContract`.
    bytes32 internal constant _DOMAIN_TYPEHASH_SANS_VERIFYING_CONTRACT =
        0xc2f8787176b8ac6bf7215b4adcc1e069bf4ab82d9ab1df05a57a91d425935b6e;

    uint256 private immutable _cachedThis;
    uint256 private immutable _cachedChainId;
    bytes32 private immutable _cachedNameHash;
    bytes32 private immutable _cachedVersionHash;
    bytes32 private immutable _cachedDomainSeparator;

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

    /// @dev Cache the hashes for cheaper runtime gas costs.
    /// In the case of upgradeable contracts (i.e. proxies),
    /// or if the chain id changes due to a hard fork,
    /// the domain separator will be seamlessly calculated on-the-fly.
    constructor() {
        _cachedThis = uint256(uint160(address(this)));
        _cachedChainId = block.chainid;

        string memory name;
        string memory version;
        if (!_domainNameAndVersionMayChange()) (name, version) = _domainNameAndVersion();
        bytes32 nameHash = _domainNameAndVersionMayChange() ? bytes32(0) : keccak256(bytes(name));
        bytes32 versionHash =
            _domainNameAndVersionMayChange() ? bytes32(0) : keccak256(bytes(version));
        _cachedNameHash = nameHash;
        _cachedVersionHash = versionHash;

        bytes32 separator;
        if (!_domainNameAndVersionMayChange()) {
            /// @solidity memory-safe-assembly
            assembly {
                let m := mload(0x40) // Load the free memory pointer.
                mstore(m, _DOMAIN_TYPEHASH)
                mstore(add(m, 0x20), nameHash)
                mstore(add(m, 0x40), versionHash)
                mstore(add(m, 0x60), chainid())
                mstore(add(m, 0x80), address())
                separator := keccak256(m, 0xa0)
            }
        }
        _cachedDomainSeparator = separator;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   FUNCTIONS TO OVERRIDE                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Please override this function to return the domain name and version.
    /// ```
    ///     function _domainNameAndVersion()
    ///         internal
    ///         pure
    ///         virtual
    ///         returns (string memory name, string memory version)
    ///     {
    ///         name = "Solady";
    ///         version = "1";
    ///     }
    /// ```
    ///
    /// Note: If the returned result may change after the contract has been deployed,
    /// you must override `_domainNameAndVersionMayChange()` to return true.
    function _domainNameAndVersion()
        internal
        view
        virtual
        returns (string memory name, string memory version);

    /// @dev Returns if `_domainNameAndVersion()` may change
    /// after the contract has been deployed (i.e. after the constructor).
    /// Default: false.
    function _domainNameAndVersionMayChange() internal pure virtual returns (bool result) {}

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

    /// @dev Returns the EIP-712 domain separator.
    function _domainSeparator() internal view virtual returns (bytes32 separator) {
        if (_domainNameAndVersionMayChange()) {
            separator = _buildDomainSeparator();
        } else {
            separator = _cachedDomainSeparator;
            if (_cachedDomainSeparatorInvalidated()) separator = _buildDomainSeparator();
        }
    }

    /// @dev Returns the hash of the fully encoded EIP-712 message for this domain,
    /// given `structHash`, as defined in
    /// https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct.
    ///
    /// The hash can be used together with {ECDSA-recover} to obtain the signer of a message:
    /// ```
    ///     bytes32 digest = _hashTypedData(keccak256(abi.encode(
    ///         keccak256("Mail(address to,string contents)"),
    ///         mailTo,
    ///         keccak256(bytes(mailContents))
    ///     )));
    ///     address signer = ECDSA.recover(digest, signature);
    /// ```
    function _hashTypedData(bytes32 structHash) internal view virtual returns (bytes32 digest) {
        // We will use `digest` to store the domain separator to save a bit of gas.
        if (_domainNameAndVersionMayChange()) {
            digest = _buildDomainSeparator();
        } else {
            digest = _cachedDomainSeparator;
            if (_cachedDomainSeparatorInvalidated()) digest = _buildDomainSeparator();
        }
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the digest.
            mstore(0x00, 0x1901000000000000) // Store "\x19\x01".
            mstore(0x1a, digest) // Store the domain separator.
            mstore(0x3a, structHash) // Store the struct hash.
            digest := keccak256(0x18, 0x42)
            // Restore the part of the free memory slot that was overwritten.
            mstore(0x3a, 0)
        }
    }

    /// @dev Variant of `_hashTypedData` that excludes the chain ID.
    /// Included for the niche use case of cross-chain workflows.
    function _hashTypedDataSansChainId(bytes32 structHash)
        internal
        view
        virtual
        returns (bytes32 digest)
    {
        (string memory name, string memory version) = _domainNameAndVersion();
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Load the free memory pointer.
            mstore(0x00, _DOMAIN_TYPEHASH_SANS_CHAIN_ID)
            mstore(0x20, keccak256(add(name, 0x20), mload(name)))
            mstore(0x40, keccak256(add(version, 0x20), mload(version)))
            mstore(0x60, address())
            // Compute the digest.
            mstore(0x20, keccak256(0x00, 0x80)) // Store the domain separator.
            mstore(0x00, 0x1901) // Store "\x19\x01".
            mstore(0x40, structHash) // Store the struct hash.
            digest := keccak256(0x1e, 0x42)
            mstore(0x40, m) // Restore the free memory pointer.
            mstore(0x60, 0) // Restore the zero pointer.
        }
    }

    /// @dev Variant of `_hashTypedData` that excludes the chain ID and verifying contract.
    /// Included for the niche use case of cross-chain and multi-verifier workflows.
    function _hashTypedDataSansChainIdAndVerifyingContract(bytes32 structHash)
        internal
        view
        virtual
        returns (bytes32 digest)
    {
        (string memory name, string memory version) = _domainNameAndVersion();
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Load the free memory pointer.
            mstore(0x00, _DOMAIN_TYPEHASH_SANS_CHAIN_ID_AND_VERIFYING_CONTRACT)
            mstore(0x20, keccak256(add(name, 0x20), mload(name)))
            mstore(0x40, keccak256(add(version, 0x20), mload(version)))
            // Compute the digest.
            mstore(0x20, keccak256(0x00, 0x60)) // Store the domain separator.
            mstore(0x00, 0x1901) // Store "\x19\x01".
            mstore(0x40, structHash) // Store the struct hash.
            digest := keccak256(0x1e, 0x42)
            mstore(0x40, m) // Restore the free memory pointer.
            mstore(0x60, 0) // Restore the zero pointer.
        }
    }

    /// @dev Variant of `_hashTypedData` that excludes the chain ID and verifying contract.
    /// Included for the niche use case of multi-verifier workflows.
    function _hashTypedDataSansVerifyingContract(bytes32 structHash)
        internal
        view
        virtual
        returns (bytes32 digest)
    {
        (string memory name, string memory version) = _domainNameAndVersion();
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Load the free memory pointer.
            mstore(0x00, _DOMAIN_TYPEHASH_SANS_VERIFYING_CONTRACT)
            mstore(0x20, keccak256(add(name, 0x20), mload(name)))
            mstore(0x40, keccak256(add(version, 0x20), mload(version)))
            mstore(0x60, chainid())
            // Compute the digest.
            mstore(0x20, keccak256(0x00, 0x80)) // Store the domain separator.
            mstore(0x00, 0x1901) // Store "\x19\x01".
            mstore(0x40, structHash) // Store the struct hash.
            digest := keccak256(0x1e, 0x42)
            mstore(0x40, m) // Restore the free memory pointer.
            mstore(0x60, 0) // Restore the zero pointer.
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                    EIP-5267 OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev See: https://eips.ethereum.org/EIPS/eip-5267
    function eip712Domain()
        public
        view
        virtual
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        )
    {
        fields = hex"0f"; // `0b01111`.
        (name, version) = _domainNameAndVersion();
        chainId = block.chainid;
        verifyingContract = address(this);
        salt = salt; // `bytes32(0)`.
        extensions = extensions; // `new uint256[](0)`.
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                      PRIVATE HELPERS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the EIP-712 domain separator.
    function _buildDomainSeparator() private view returns (bytes32 separator) {
        // We will use `separator` to store the name hash to save a bit of gas.
        bytes32 versionHash;
        if (_domainNameAndVersionMayChange()) {
            (string memory name, string memory version) = _domainNameAndVersion();
            separator = keccak256(bytes(name));
            versionHash = keccak256(bytes(version));
        } else {
            separator = _cachedNameHash;
            versionHash = _cachedVersionHash;
        }
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Load the free memory pointer.
            mstore(m, _DOMAIN_TYPEHASH)
            mstore(add(m, 0x20), separator) // Name hash.
            mstore(add(m, 0x40), versionHash)
            mstore(add(m, 0x60), chainid())
            mstore(add(m, 0x80), address())
            separator := keccak256(m, 0xa0)
        }
    }

    /// @dev Returns if the cached domain separator has been invalidated.
    function _cachedDomainSeparatorInvalidated() private view returns (bool result) {
        uint256 cachedChainId = _cachedChainId;
        uint256 cachedThis = _cachedThis;
        /// @solidity memory-safe-assembly
        assembly {
            result := iszero(and(eq(chainid(), cachedChainId), eq(address(), cachedThis)))
        }
    }
}

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

/// @notice Simple single owner authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
///
/// @dev Note:
/// This implementation does NOT auto-initialize the owner to `msg.sender`.
/// You MUST call the `_initializeOwner` in the constructor / initializer.
///
/// While the ownable portion follows
/// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility,
/// the nomenclature for the 2-step ownership handover may be unique to this codebase.
abstract contract Ownable {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The caller is not authorized to call the function.
    error Unauthorized();

    /// @dev The `newOwner` cannot be the zero address.
    error NewOwnerIsZeroAddress();

    /// @dev The `pendingOwner` does not have a valid handover request.
    error NoHandoverRequest();

    /// @dev Cannot double-initialize.
    error AlreadyInitialized();

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

    /// @dev The ownership is transferred from `oldOwner` to `newOwner`.
    /// This event is intentionally kept the same as OpenZeppelin's Ownable to be
    /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173),
    /// despite it not being as lightweight as a single argument event.
    event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);

    /// @dev An ownership handover to `pendingOwner` has been requested.
    event OwnershipHandoverRequested(address indexed pendingOwner);

    /// @dev The ownership handover to `pendingOwner` has been canceled.
    event OwnershipHandoverCanceled(address indexed pendingOwner);

    /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`.
    uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE =
        0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0;

    /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE =
        0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d;

    /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE =
        0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92;

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

    /// @dev The owner slot is given by:
    /// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`.
    /// It is intentionally chosen to be a high value
    /// to avoid collision with lower slots.
    /// The choice of manual storage layout is to enable compatibility
    /// with both regular and upgradeable contracts.
    bytes32 internal constant _OWNER_SLOT =
        0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927;

    /// The ownership handover slot of `newOwner` is given by:
    /// ```
    ///     mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED))
    ///     let handoverSlot := keccak256(0x00, 0x20)
    /// ```
    /// It stores the expiry timestamp of the two-step ownership handover.
    uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     INTERNAL FUNCTIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Override to return true to make `_initializeOwner` prevent double-initialization.
    function _guardInitializeOwner() internal pure virtual returns (bool guard) {}

    /// @dev Initializes the owner directly without authorization guard.
    /// This function must be called upon initialization,
    /// regardless of whether the contract is upgradeable or not.
    /// This is to enable generalization to both regular and upgradeable contracts,
    /// and to save gas in case the initial owner is not the caller.
    /// For performance reasons, this function will not check if there
    /// is an existing owner.
    function _initializeOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                if sload(ownerSlot) {
                    mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`.
                    revert(0x1c, 0x04)
                }
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(_OWNER_SLOT, newOwner)
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        }
    }

    /// @dev Sets the owner directly without authorization guard.
    function _setOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, newOwner)
            }
        }
    }

    /// @dev Throws if the sender is not the owner.
    function _checkOwner() internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // If the caller is not the stored owner, revert.
            if iszero(eq(caller(), sload(_OWNER_SLOT))) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Returns how long a two-step ownership handover is valid for in seconds.
    /// Override to return a different value if needed.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _ownershipHandoverValidFor() internal view virtual returns (uint64) {
        return 48 * 3600;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  PUBLIC UPDATE FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Allows the owner to transfer the ownership to `newOwner`.
    function transferOwnership(address newOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(shl(96, newOwner)) {
                mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`.
                revert(0x1c, 0x04)
            }
        }
        _setOwner(newOwner);
    }

    /// @dev Allows the owner to renounce their ownership.
    function renounceOwnership() public payable virtual onlyOwner {
        _setOwner(address(0));
    }

    /// @dev Request a two-step ownership handover to the caller.
    /// The request will automatically expire in 48 hours (172800 seconds) by default.
    function requestOwnershipHandover() public payable virtual {
        unchecked {
            uint256 expires = block.timestamp + _ownershipHandoverValidFor();
            /// @solidity memory-safe-assembly
            assembly {
                // Compute and set the handover slot to `expires`.
                mstore(0x0c, _HANDOVER_SLOT_SEED)
                mstore(0x00, caller())
                sstore(keccak256(0x0c, 0x20), expires)
                // Emit the {OwnershipHandoverRequested} event.
                log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller())
            }
        }
    }

    /// @dev Cancels the two-step ownership handover to the caller, if any.
    function cancelOwnershipHandover() public payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x20), 0)
            // Emit the {OwnershipHandoverCanceled} event.
            log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller())
        }
    }

    /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`.
    /// Reverts if there is no existing ownership handover requested by `pendingOwner`.
    function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            let handoverSlot := keccak256(0x0c, 0x20)
            // If the handover does not exist, or has expired.
            if gt(timestamp(), sload(handoverSlot)) {
                mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`.
                revert(0x1c, 0x04)
            }
            // Set the handover slot to 0.
            sstore(handoverSlot, 0)
        }
        _setOwner(pendingOwner);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   PUBLIC READ FUNCTIONS                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the owner of the contract.
    function owner() public view virtual returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(_OWNER_SLOT)
        }
    }

    /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`.
    function ownershipHandoverExpiresAt(address pendingOwner)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the handover slot.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            // Load the handover slot.
            result := sload(keccak256(0x0c, 0x20))
        }
    }

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

    /// @dev Marks a function as only callable by the owner.
    modifier onlyOwner() virtual {
        _checkOwner();
        _;
    }
}

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

import {SingleUseETHVault} from "./SingleUseETHVault.sol";

/// @notice Library for force safe transferring ETH and ERC20s in ZKsync.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ext/zksync/SafeTransferLib.sol)
library SafeTransferLib {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev A single use ETH vault has been created for `to`, with `amount`.
    event SingleUseETHVaultCreated(address indexed to, uint256 amount, address vault);

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The ETH transfer has failed.
    error ETHTransferFailed();

    /// @dev The ERC20 `transferFrom` has failed.
    error TransferFromFailed();

    /// @dev The ERC20 `transfer` has failed.
    error TransferFailed();

    /// @dev The ERC20 `approve` has failed.
    error ApproveFailed();

    /// @dev The ERC20 `totalSupply` query has failed.
    error TotalSupplyQueryFailed();

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

    /// @dev Suggested gas stipend for contract receiving ETH to perform a few
    /// storage reads and writes, but low enough to prevent griefing.
    uint256 internal constant GAS_STIPEND_NO_GRIEF = 1000000;

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

    // If the ETH transfer MUST succeed with a reasonable gas budget, use the force variants.
    //
    // The regular variants:
    // - Forwards all remaining gas to the target.
    // - Reverts if the target reverts.
    // - Reverts if the current contract has insufficient balance.
    //
    // The force variants:
    // - Forwards with an optional gas stipend
    //   (defaults to `GAS_STIPEND_NO_GRIEF`, which is sufficient for most cases).
    // - If the target reverts, or if the gas stipend is exhausted,
    //   creates a temporary contract to force send the ETH via `SELFDESTRUCT`.
    //   Future compatible with `SENDALL`: https://eips.ethereum.org/EIPS/eip-4758.
    // - Reverts if the current contract has insufficient balance.
    //
    // The try variants:
    // - Forwards with a mandatory gas stipend.
    // - Instead of reverting, returns whether the transfer succeeded.

    /// @dev Sends `amount` (in wei) ETH to `to`.
    function safeTransferETH(address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(call(gas(), to, amount, 0x00, 0x00, 0x00, 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Sends all the ETH in the current contract to `to`.
    function safeTransferAllETH(address to) internal {
        /// @solidity memory-safe-assembly
        assembly {
            // Transfer all the ETH and check if it succeeded or not.
            if iszero(call(gas(), to, selfbalance(), 0x00, 0x00, 0x00, 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Force sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    /// If force transfer is used, returns the vault. Else returns `address(0)`.
    function forceSafeTransferETH(address to, uint256 amount, uint256 gasStipend)
        internal
        returns (address vault)
    {
        if (amount == uint256(0)) return address(0); // Early return if `amount` is zero.
        uint256 selfBalanceBefore = address(this).balance;
        /// @solidity memory-safe-assembly
        assembly {
            if lt(selfBalanceBefore, amount) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
            pop(call(gasStipend, to, amount, 0x00, 0x00, 0x00, 0x00))
        }
        if (address(this).balance == selfBalanceBefore) {
            vault = address(new SingleUseETHVault());
            /// @solidity memory-safe-assembly
            assembly {
                mstore(0x00, shr(96, shl(96, to)))
                if iszero(call(gas(), vault, amount, 0x00, 0x20, 0x00, 0x00)) { revert(0x00, 0x00) }
            }
            emit SingleUseETHVaultCreated(to, amount, vault);
        }
    }

    /// @dev Force sends all the ETH in the current contract to `to`, with a `gasStipend`.
    /// If force transfer is used, returns the vault. Else returns `address(0)`.
    function forceSafeTransferAllETH(address to, uint256 gasStipend)
        internal
        returns (address vault)
    {
        vault = forceSafeTransferETH(to, address(this).balance, gasStipend);
    }

    /// @dev Force sends `amount` (in wei) ETH to `to`, with `GAS_STIPEND_NO_GRIEF`.
    /// If force transfer is used, returns the vault. Else returns `address(0)`.
    function forceSafeTransferETH(address to, uint256 amount) internal returns (address vault) {
        vault = forceSafeTransferETH(to, amount, GAS_STIPEND_NO_GRIEF);
    }

    /// @dev Force sends all the ETH in the current contract to `to`, with `GAS_STIPEND_NO_GRIEF`.
    /// If force transfer is used, returns the vault. Else returns `address(0)`.
    function forceSafeTransferAllETH(address to) internal returns (address vault) {
        vault = forceSafeTransferETH(to, address(this).balance, GAS_STIPEND_NO_GRIEF);
    }

    /// @dev Sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    function trySafeTransferETH(address to, uint256 amount, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, amount, 0x00, 0x00, 0x00, 0x00)
        }
    }

    /// @dev Sends all the ETH in the current contract to `to`, with a `gasStipend`.
    function trySafeTransferAllETH(address to, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, selfbalance(), 0x00, 0x00, 0x00, 0x00)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                      ERC20 OPERATIONS                      */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have at least `amount` approved for
    /// the current contract to manage.
    function safeTransferFrom(address token, address from, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x60, amount) // Store the `amount` argument.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`.
            let success := call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    ///
    /// The `from` account must have at least `amount` approved for the current contract to manage.
    function trySafeTransferFrom(address token, address from, address to, uint256 amount)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x60, amount) // Store the `amount` argument.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`.
            success := call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                success := lt(or(iszero(extcodesize(token)), returndatasize()), success)
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends all of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have their entire balance approved for the current contract to manage.
    function safeTransferAllFrom(address token, address from, address to)
        internal
        returns (uint256 amount)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x60, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x00, 0x23b872dd) // `transferFrom(address,address,uint256)`.
            amount := mload(0x60) // The `amount` is already at 0x60. We'll need to return it.
            // Perform the transfer, reverting upon failure.
            let success := call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransfer(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            let success := call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sends all of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransferAll(address token, address to) internal returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, 0x70a08231) // Store the function selector of `balanceOf(address)`.
            mstore(0x20, address()) // Store the address of the current contract.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x34, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x14, to) // Store the `to` argument.
            amount := mload(0x34) // The `amount` is already at 0x34. We'll need to return it.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            let success := call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// Reverts upon failure.
    function safeApprove(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            let success := call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// If the initial attempt to approve fails, attempts to reset the approved amount to zero,
    /// then retries the approval again (some tokens, e.g. USDT, requires this).
    /// Reverts upon failure.
    function safeApproveWithRetry(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            // Perform the approval, retrying upon failure.
            let success := call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
            if iszero(and(eq(mload(0x00), 1), success)) {
                if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                    mstore(0x34, 0) // Store 0 for the `amount`.
                    mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
                    pop(call(gas(), token, 0, 0x10, 0x44, 0x00, 0x00)) // Reset the approval.
                    mstore(0x34, amount) // Store back the original `amount`.
                    // Retry the approval, reverting upon failure.
                    success := call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                    if iszero(and(eq(mload(0x00), 1), success)) {
                        // Check the `extcodesize` again just in case the token selfdestructs lol.
                        if iszero(lt(or(iszero(extcodesize(token)), returndatasize()), success)) {
                            mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                            revert(0x1c, 0x04)
                        }
                    }
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Returns the amount of ERC20 `token` owned by `account`.
    /// Returns zero if the `token` does not exist.
    function balanceOf(address token, address account) internal view returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, account) // Store the `account` argument.
            mstore(0x00, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            amount :=
                mul( // The arguments of `mul` are evaluated from right to left.
                    mload(0x20),
                    and( // The arguments of `and` are evaluated from right to left.
                        gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                        staticcall(gas(), token, 0x10, 0x24, 0x20, 0x20)
                    )
                )
        }
    }

    /// @dev Returns the total supply of the `token`.
    /// Reverts if the token does not exist or does not implement `totalSupply()`.
    function totalSupply(address token) internal view returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, 0x18160ddd) // `totalSupply()`.
            if iszero(
                and(gt(returndatasize(), 0x1f), staticcall(gas(), token, 0x1c, 0x04, 0x00, 0x20))
            ) {
                mstore(0x00, 0x54cd9435) // `TotalSupplyQueryFailed()`.
                revert(0x1c, 0x04)
            }
            result := mload(0x00)
        }
    }
}

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

/// @notice Signature verification helper that supports both ECDSA signatures from EOAs
/// and ERC1271 signatures from smart contract wallets like Argent and Gnosis safe.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/SignatureCheckerLib.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/SignatureChecker.sol)
///
/// @dev Note:
/// - The signature checking functions use the ecrecover precompile (0x1).
/// - The `bytes memory signature` variants use the identity precompile (0x4)
///   to copy memory internally.
/// - Unlike ECDSA signatures, contract signatures are revocable.
/// - As of Solady version 0.0.134, all `bytes signature` variants accept both
///   regular 65-byte `(r, s, v)` and EIP-2098 `(r, vs)` short form signatures.
///   See: https://eips.ethereum.org/EIPS/eip-2098
///   This is for calldata efficiency on smart accounts prevalent on L2s.
///
/// WARNING! Do NOT use signatures as unique identifiers:
/// - Use a nonce in the digest to prevent replay attacks on the same contract.
/// - Use EIP-712 for the digest to prevent replay attacks across different chains and contracts.
///   EIP-712 also enables readable signing of typed data for better user safety.
/// This implementation does NOT check if a signature is non-malleable.
library SignatureCheckerLib {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*               SIGNATURE CHECKING OPERATIONS                */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns whether `signature` is valid for `signer` and `hash`.
    /// If `signer.code.length == 0`, then validate with `ecrecover`, else
    /// it will validate with ERC1271 on `signer`.
    function isValidSignatureNow(address signer, bytes32 hash, bytes memory signature)
        internal
        view
        returns (bool isValid)
    {
        if (signer == address(0)) return isValid;
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            for {} 1 {} {
                if iszero(extcodesize(signer)) {
                    switch mload(signature)
                    case 64 {
                        let vs := mload(add(signature, 0x40))
                        mstore(0x20, add(shr(255, vs), 27)) // `v`.
                        mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    }
                    case 65 {
                        mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                        mstore(0x60, mload(add(signature, 0x40))) // `s`.
                    }
                    default { break }
                    mstore(0x00, hash)
                    mstore(0x40, mload(add(signature, 0x20))) // `r`.
                    let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                    isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                // Copy the `signature` over.
                let n := add(0x20, mload(signature))
                let copied := staticcall(gas(), 4, signature, n, add(m, 0x44), n)
                isValid := staticcall(gas(), signer, m, add(returndatasize(), 0x44), d, 0x20)
                isValid := and(eq(mload(d), f), and(isValid, copied))
                break
            }
        }
    }

    /// @dev Returns whether `signature` is valid for `signer` and `hash`.
    /// If `signer.code.length == 0`, then validate with `ecrecover`, else
    /// it will validate with ERC1271 on `signer`.
    function isValidSignatureNowCalldata(address signer, bytes32 hash, bytes calldata signature)
        internal
        view
        returns (bool isValid)
    {
        if (signer == address(0)) return isValid;
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            for {} 1 {} {
                if iszero(extcodesize(signer)) {
                    switch signature.length
                    case 64 {
                        let vs := calldataload(add(signature.offset, 0x20))
                        mstore(0x20, add(shr(255, vs), 27)) // `v`.
                        mstore(0x40, calldataload(signature.offset)) // `r`.
                        mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    }
                    case 65 {
                        mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40)))) // `v`.
                        calldatacopy(0x40, signature.offset, 0x40) // `r`, `s`.
                    }
                    default { break }
                    mstore(0x00, hash)
                    let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                    isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), signature.length)
                // Copy the `signature` over.
                calldatacopy(add(m, 0x64), signature.offset, signature.length)
                isValid := staticcall(gas(), signer, m, add(signature.length, 0x64), d, 0x20)
                isValid := and(eq(mload(d), f), isValid)
                break
            }
        }
    }

    /// @dev Returns whether the signature (`r`, `vs`) is valid for `signer` and `hash`.
    /// If `signer.code.length == 0`, then validate with `ecrecover`, else
    /// it will validate with ERC1271 on `signer`.
    function isValidSignatureNow(address signer, bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (bool isValid)
    {
        if (signer == address(0)) return isValid;
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            for {} 1 {} {
                if iszero(extcodesize(signer)) {
                    mstore(0x00, hash)
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x40, r) // `r`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                    isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), 65) // Length of the signature.
                mstore(add(m, 0x64), r) // `r`.
                mstore(add(m, 0x84), shr(1, shl(1, vs))) // `s`.
                mstore8(add(m, 0xa4), add(shr(255, vs), 27)) // `v`.
                isValid := staticcall(gas(), signer, m, 0xa5, d, 0x20)
                isValid := and(eq(mload(d), f), isValid)
                break
            }
        }
    }

    /// @dev Returns whether the signature (`v`, `r`, `s`) is valid for `signer` and `hash`.
    /// If `signer.code.length == 0`, then validate with `ecrecover`, else
    /// it will validate with ERC1271 on `signer`.
    function isValidSignatureNow(address signer, bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (bool isValid)
    {
        if (signer == address(0)) return isValid;
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            for {} 1 {} {
                if iszero(extcodesize(signer)) {
                    mstore(0x00, hash)
                    mstore(0x20, and(v, 0xff)) // `v`.
                    mstore(0x40, r) // `r`.
                    mstore(0x60, s) // `s`.
                    let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                    isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), 65) // Length of the signature.
                mstore(add(m, 0x64), r) // `r`.
                mstore(add(m, 0x84), s) // `s`.
                mstore8(add(m, 0xa4), v) // `v`.
                isValid := staticcall(gas(), signer, m, 0xa5, d, 0x20)
                isValid := and(eq(mload(d), f), isValid)
                break
            }
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     ERC1271 OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // Note: These ERC1271 operations do NOT have an ECDSA fallback.

    /// @dev Returns whether `signature` is valid for `hash` for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, bytes memory signature)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            // Copy the `signature` over.
            let n := add(0x20, mload(signature))
            let copied := staticcall(gas(), 4, signature, n, add(m, 0x44), n)
            isValid := staticcall(gas(), signer, m, add(returndatasize(), 0x44), d, 0x20)
            isValid := and(eq(mload(d), f), and(isValid, copied))
        }
    }

    /// @dev Returns whether `signature` is valid for `hash` for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNowCalldata(
        address signer,
        bytes32 hash,
        bytes calldata signature
    ) internal view returns (bool isValid) {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), signature.length)
            // Copy the `signature` over.
            calldatacopy(add(m, 0x64), signature.offset, signature.length)
            isValid := staticcall(gas(), signer, m, add(signature.length, 0x64), d, 0x20)
            isValid := and(eq(mload(d), f), isValid)
        }
    }

    /// @dev Returns whether the signature (`r`, `vs`) is valid for `hash`
    /// for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), 65) // Length of the signature.
            mstore(add(m, 0x64), r) // `r`.
            mstore(add(m, 0x84), shr(1, shl(1, vs))) // `s`.
            mstore8(add(m, 0xa4), add(shr(255, vs), 27)) // `v`.
            isValid := staticcall(gas(), signer, m, 0xa5, d, 0x20)
            isValid := and(eq(mload(d), f), isValid)
        }
    }

    /// @dev Returns whether the signature (`v`, `r`, `s`) is valid for `hash`
    /// for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), 65) // Length of the signature.
            mstore(add(m, 0x64), r) // `r`.
            mstore(add(m, 0x84), s) // `s`.
            mstore8(add(m, 0xa4), v) // `v`.
            isValid := staticcall(gas(), signer, m, 0xa5, d, 0x20)
            isValid := and(eq(mload(d), f), isValid)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     ERC6492 OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // Note: These ERC6492 operations now include an ECDSA fallback at the very end.
    // The calldata variants are excluded for brevity.

    /// @dev Returns whether `signature` is valid for `hash`.
    /// If the signature is postfixed with the ERC6492 magic number, it will attempt to
    /// deploy / prepare the `signer` smart account before doing a regular ERC1271 check.
    /// Note: This function is NOT reentrancy safe.
    /// The verifier must be deployed.
    /// Otherwise, the function will return false if `signer` is not yet deployed / prepared.
    /// See: https://gist.github.com/Vectorized/011d6becff6e0a73e42fe100f8d7ef04
    /// With a dedicated verifier, this function is safe to use in contracts
    /// that have been granted special permissions.
    function isValidERC6492SignatureNowAllowSideEffects(
        address signer,
        bytes32 hash,
        bytes memory signature
    ) internal returns (bool isValid) {
        /// @solidity memory-safe-assembly
        assembly {
            function callIsValidSignature(signer_, hash_, signature_) -> _isValid {
                let m_ := mload(0x40)
                let f_ := shl(224, 0x1626ba7e)
                mstore(m_, f_) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m_, 0x04), hash_)
                let d_ := add(m_, 0x24)
                mstore(d_, 0x40) // The offset of the `signature` in the calldata.
                let n_ := add(0x20, mload(signature_))
                let copied_ := staticcall(gas(), 4, signature_, n_, add(m_, 0x44), n_)
                _isValid := staticcall(gas(), signer_, m_, add(returndatasize(), 0x44), d_, 0x20)
                _isValid := and(eq(mload(d_), f_), and(_isValid, copied_))
            }
            let noCode := iszero(extcodesize(signer))
            let n := mload(signature)
            for {} 1 {} {
                if iszero(eq(mload(add(signature, n)), mul(0x6492, div(not(isValid), 0xffff)))) {
                    if iszero(noCode) { isValid := callIsValidSignature(signer, hash, signature) }
                    break
                }
                if iszero(noCode) {
                    let o := add(signature, 0x20) // Signature bytes.
                    isValid := callIsValidSignature(signer, hash, add(o, mload(add(o, 0x40))))
                    if isValid { break }
                }
                let m := mload(0x40)
                mstore(m, signer)
                mstore(add(m, 0x20), hash)
                pop(
                    call(
                        gas(), // Remaining gas.
                        0x0000bc370E4DC924F427d84e2f4B9Ec81626ba7E, // Non-reverting verifier.
                        0, // Send zero ETH.
                        m, // Start of memory.
                        add(returndatasize(), 0x40), // Length of calldata in memory.
                        staticcall(gas(), 4, add(signature, 0x20), n, add(m, 0x40), n), // 1.
                        0x00 // Length of returndata to write.
                    )
                )
                isValid := returndatasize()
                break
            }
            // Do `ecrecover` fallback if `noCode && !isValid`.
            for {} gt(noCode, isValid) {} {
                switch n
                case 64 {
                    let vs := mload(add(signature, 0x40))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                }
                case 65 {
                    mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                    mstore(0x60, mload(add(signature, 0x40))) // `s`.
                }
                default { break }
                let m := mload(0x40)
                mstore(0x00, hash)
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                break
            }
        }
    }

    /// @dev Returns whether `signature` is valid for `hash`.
    /// If the signature is postfixed with the ERC6492 magic number, it will attempt
    /// to use a reverting verifier to deploy / prepare the `signer` smart account
    /// and do a `isValidSignature` check via the reverting verifier.
    /// Note: This function is reentrancy safe.
    /// The reverting verifier must be deployed.
    /// Otherwise, the function will return false if `signer` is not yet deployed / prepared.
    /// See: https://gist.github.com/Vectorized/846a474c855eee9e441506676800a9ad
    function isValidERC6492SignatureNow(address signer, bytes32 hash, bytes memory signature)
        internal
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            function callIsValidSignature(signer_, hash_, signature_) -> _isValid {
                let m_ := mload(0x40)
                let f_ := shl(224, 0x1626ba7e)
                mstore(m_, f_) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m_, 0x04), hash_)
                let d_ := add(m_, 0x24)
                mstore(d_, 0x40) // The offset of the `signature` in the calldata.
                let n_ := add(0x20, mload(signature_))
                let copied_ := staticcall(gas(), 4, signature_, n_, add(m_, 0x44), n_)
                _isValid := staticcall(gas(), signer_, m_, add(returndatasize(), 0x44), d_, 0x20)
                _isValid := and(eq(mload(d_), f_), and(_isValid, copied_))
            }
            let noCode := iszero(extcodesize(signer))
            let n := mload(signature)
            for {} 1 {} {
                if iszero(eq(mload(add(signature, n)), mul(0x6492, div(not(isValid), 0xffff)))) {
                    if iszero(noCode) { isValid := callIsValidSignature(signer, hash, signature) }
                    break
                }
                if iszero(noCode) {
                    let o := add(signature, 0x20) // Signature bytes.
                    isValid := callIsValidSignature(signer, hash, add(o, mload(add(o, 0x40))))
                    if isValid { break }
                }
                let m := mload(0x40)
                mstore(m, signer)
                mstore(add(m, 0x20), hash)
                let willBeZeroIfRevertingVerifierExists :=
                    call(
                        gas(), // Remaining gas.
                        0x00007bd799e4A591FeA53f8A8a3E9f931626Ba7e, // Reverting verifier.
                        0, // Send zero ETH.
                        m, // Start of memory.
                        add(returndatasize(), 0x40), // Length of calldata in memory.
                        staticcall(gas(), 4, add(signature, 0x20), n, add(m, 0x40), n), // 1.
                        0x00 // Length of returndata to write.
                    )
                isValid := gt(returndatasize(), willBeZeroIfRevertingVerifierExists)
                break
            }
            // Do `ecrecover` fallback if `noCode && !isValid`.
            for {} gt(noCode, isValid) {} {
                switch n
                case 64 {
                    let vs := mload(add(signature, 0x40))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                }
                case 65 {
                    mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                    mstore(0x60, mload(add(signature, 0x40))) // `s`.
                }
                default { break }
                let m := mload(0x40)
                mstore(0x00, hash)
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                let recovered := mload(staticcall(gas(), 1, 0x00, 0x80, 0x01, 0x20))
                isValid := gt(returndatasize(), shl(96, xor(signer, recovered)))
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                break
            }
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     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 {
            mstore(0x20, hash) // Store into scratch space for keccak256.
            mstore(0x00, "\x00\x00\x00\x00\x19Ethereum Signed Message:\n32") // 28 bytes.
            result := keccak256(0x04, 0x3c) // `32 * 2 - (32 - 28) = 60 = 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.
    /// Note: Supports lengths of `s` up to 999999 bytes.
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            let sLength := mload(s)
            let o := 0x20
            mstore(o, "\x19Ethereum Signed Message:\n") // 26 bytes, zero-right-padded.
            mstore(0x00, 0x00)
            // Convert the `s.length` to ASCII decimal representation: `base10(s.length)`.
            for { let temp := sLength } 1 {} {
                o := sub(o, 1)
                mstore8(o, add(48, mod(temp, 10)))
                temp := div(temp, 10)
                if iszero(temp) { break }
            }
            let n := sub(0x3a, o) // Header length: `26 + 32 - o`.
            // Throw an out-of-offset error (consumes all gas) if the header exceeds 32 bytes.
            returndatacopy(returndatasize(), returndatasize(), gt(n, 0x20))
            mstore(s, or(mload(0x00), mload(n))) // Temporarily store the header.
            result := keccak256(add(s, sub(0x20, n)), add(n, sLength))
            mstore(s, sLength) // Restore the length.
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   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: MIT
pragma solidity ^0.8.0;

struct PackItem {
    address token;
    uint96 id;
}

struct CubeResult {
    BlisterPackResult[] blisterPacks;
    ToyResult[] looseToys;
    uint256 looseItems;
}

struct BlisterPackResult {
    ToyResult[] toys;
    uint256 looseItems;
}

struct ToyResult {
    uint256 equippedItems;
}

enum PurchaseType {
    TOY,
    ITEM,
    EQUIPPED_ITEM,
    TOY_WITH_ITEMS,
    BLISTER_PACK
}

struct CheckoutItem {
    PurchaseType purchaseType;
    bool enabled;
    bool quantityLimited;
    uint40 activeFrom;
    uint40 activeUntil;
    uint32 price;
    uint32 maxQuantityPerPurchase;
    uint32 maxQuantityPerAddress;
    uint32 totalAvailable;
    uint32 remainingAvailable;
    string name;
    bytes additionalData;
}

struct CreateCheckoutItem {
    PurchaseType purchaseType;
    bool quantityLimited;
    uint40 activeFrom;
    uint40 activeUntil;
    uint32 price;
    uint32 maxQuantityPerPurchase;
    uint32 maxQuantityPerAddress;
    uint32 totalAvailable;
    string name;
    bytes additionalData;
}

struct UpdateCheckoutItem {
    bool enabled;
    uint40 activeFrom;
    uint40 activeUntil;
    uint32 price;
    uint32 maxQuantityPerPurchase;
    uint32 maxQuantityPerAddress;
    uint32 totalAvailable;
    string name;
    bytes additionalData;
}

struct PurchaseReservation {
    address buyer;
    uint16 quantity;
    uint80 amount;
}

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

/// @notice A single-use vault that allows a designated caller to withdraw all ETH in it.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ext/zksync/SingleUseETHVault.sol)
contract SingleUseETHVault {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Unable to withdraw all.
    error WithdrawAllFailed();

    /// @dev Not authorized.
    error Unauthorized();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        WITHDRAW ALL                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    fallback() external payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x40, 0) // Optimization trick to remove free memory pointer initialization.
            let owner := sload(0)
            // Initialization.
            if iszero(owner) {
                sstore(0, calldataload(0x00)) // Store the owner.
                return(0x00, 0x00) // Early return.
            }
            // Authorization check.
            if iszero(eq(caller(), owner)) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
            let to := calldataload(0x00)
            // If the calldata is less than 32 bytes, zero-left-pad it to 32 bytes.
            // Then use the rightmost 20 bytes of the word as the `to` address.
            // This allows for the calldata to be `abi.encode(to)` or `abi.encodePacked(to)`.
            to := shr(mul(lt(calldatasize(), 0x20), shl(3, sub(0x20, calldatasize()))), to)
            // If `to` is `address(0)`, set it to `msg.sender`.
            to := xor(mul(xor(to, caller()), iszero(to)), to)
            // Transfers the whole balance to `to`.
            if iszero(call(gas(), to, selfbalance(), 0x00, 0x00, 0x00, 0x00)) {
                mstore(0x00, 0x651aee10) // `WithdrawAllFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }
}

{
  "viaIR": false,
  "codegen": "yul",
  "remappings": [
    "@/=src/",
    "@openzeppelin-contracts-4.9.6/=dependencies/@openzeppelin-contracts-4.9.6/",
    "@openzeppelin-contracts-5.3.0/=dependencies/@openzeppelin-contracts-5.3.0/",
    "@openzeppelin/contracts-v4/=dependencies/openzeppelin-contracts/contracts/",
    "@zksync-contracts-28.0.1/=dependencies/@zksync-contracts-28.0.1/",
    "era-contracts/=dependencies/@zksync-contracts-28.0.1/contracts/",
    "forge-std-1.9.7/=dependencies/forge-std-1.9.7/",
    "solady-0.1.24/=dependencies/solady-0.1.24/",
    "@openzeppelin/contracts/=dependencies/@zksync-contracts-28.0.1/lib/openzeppelin-contracts/contracts/",
    "ds-test/=dependencies/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=dependencies/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=dependencies/openzeppelin-contracts/lib/forge-std/src/",
    "openzeppelin-contracts/=dependencies/openzeppelin-contracts/",
    "openzeppelin/=dependencies/openzeppelin-contracts/contracts/"
  ],
  "evmVersion": "prague",
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "size_fallback": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {},
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"address","name":"_signer","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AlreadyInitialized","type":"error"},{"inputs":[],"name":"ExceedsMaxQuantity","type":"error"},{"inputs":[],"name":"NewOwnerIsZeroAddress","type":"error"},{"inputs":[],"name":"NoHandoverRequest","type":"error"},{"inputs":[],"name":"Paused","type":"error"},{"inputs":[],"name":"ReservationExpired","type":"error"},{"inputs":[],"name":"ReservationUsed","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"pendingOwner","type":"address"}],"name":"OwnershipHandoverCanceled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"pendingOwner","type":"address"}],"name":"OwnershipHandoverRequested","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":true,"internalType":"bytes32","name":"reservationId","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"quantity","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"pricePerUnit","type":"uint256"}],"name":"Purchase","type":"event"},{"inputs":[],"name":"PURCHASE_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cancelOwnershipHandover","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"pendingOwner","type":"address"}],"name":"completeOwnershipHandover","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"eip712Domain","outputs":[{"internalType":"bytes1","name":"fields","type":"bytes1"},{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"version","type":"string"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"address","name":"verifyingContract","type":"address"},{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"uint256[]","name":"extensions","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isPaused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"result","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"pendingOwner","type":"address"}],"name":"ownershipHandoverExpiresAt","outputs":[{"internalType":"uint256","name":"result","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paymentToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"reservationId","type":"bytes32"},{"internalType":"address","name":"buyer","type":"address"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"maxQuantity","type":"uint256"},{"internalType":"uint256","name":"expiration","type":"uint256"},{"internalType":"uint256","name":"pricePerUnit","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"processPayment","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"requestOwnershipHandover","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"reservations","outputs":[{"internalType":"address","name":"buyer","type":"address"},{"internalType":"uint16","name":"quantity","type":"uint16"},{"internalType":"uint80","name":"amount","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_isPaused","type":"bool"}],"name":"setPaused","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000003e18b7cfc3955f5edfeb03ba04d78b4c9c8050bb00000000000000000000000084a71ccd554cc1b02749b35d22f684cc8ec987e1000000000000000000000000f0b272184dab47945ec2ace865db66cd6ba20cb7

-----Decoded View---------------
Arg [0] : owner (address): 0x3e18b7CFc3955f5edfeB03Ba04D78b4c9C8050bb
Arg [1] : _paymentToken (address): 0x84A71ccD554Cc1b02749b35d22F684CC8ec987e1
Arg [2] : _signer (address): 0xF0b272184dAb47945eC2AcE865db66CD6ba20CB7

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000003e18b7cfc3955f5edfeb03ba04d78b4c9c8050bb
Arg [1] : 00000000000000000000000084a71ccd554cc1b02749b35d22f684cc8ec987e1
Arg [2] : 000000000000000000000000f0b272184dab47945ec2ace865db66cd6ba20cb7