// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable avoid-low-level-calls */
/* solhint-disable no-empty-blocks */

import "../interfaces/IAccount.sol";
import "../interfaces/IEntryPoint.sol";
import "./Helpers.sol";

/**
 * Basic account implementation.
 * this contract provides the basic logic for implementing the IAccount interface  - validateUserOp
 * specific account implementation should inherit it and provide the account-specific logic
 */
abstract contract BaseAccount is IAccount {
    using UserOperationLib for UserOperation;

    //return value in case of signature failure, with no time-range.
    // equivalent to _packValidationData(true,0,0);
    uint256 constant internal SIG_VALIDATION_FAILED = 1;

    /**
     * Return the account nonce.
     * This method returns the next sequential nonce.
     * For a nonce of a specific key, use `entrypoint.getNonce(account, key)`
     */
    function getNonce() public view virtual returns (uint256) {
        return entryPoint().getNonce(address(this), 0);
    }

    /**
     * return the entryPoint used by this account.
     * subclass should return the current entryPoint used by this account.
     */
    function entryPoint() public view virtual returns (IEntryPoint);

    /**
     * Validate user's signature and nonce.
     * subclass doesn't need to override this method. Instead, it should override the specific internal validation methods.
     */
    function validateUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 missingAccountFunds)
    external override virtual returns (uint256 validationData) {
        _requireFromEntryPoint();
        validationData = _validateSignature(userOp, userOpHash);
        _validateNonce(userOp.nonce);
        _payPrefund(missingAccountFunds);
    }

    /**
     * ensure the request comes from the known entrypoint.
     */
    function _requireFromEntryPoint() internal virtual view {
        require(msg.sender == address(entryPoint()), "account: not from EntryPoint");
    }

    /**
     * validate the signature is valid for this message.
     * @param userOp validate the userOp.signature field
     * @param userOpHash convenient field: the hash of the request, to check the signature against
     *          (also hashes the entrypoint and chain id)
     * @return validationData signature and time-range of this operation
     *      <20-byte> sigAuthorizer - 0 for valid signature, 1 to mark signature failure,
     *         otherwise, an address of an "authorizer" contract.
     *      <6-byte> validUntil - last timestamp this operation is valid. 0 for "indefinite"
     *      <6-byte> validAfter - first timestamp this operation is valid
     *      If the account doesn't use time-range, it is enough to return SIG_VALIDATION_FAILED value (1) for signature failure.
     *      Note that the validation code cannot use block.timestamp (or block.number) directly.
     */
    function _validateSignature(UserOperation calldata userOp, bytes32 userOpHash)
    internal virtual returns (uint256 validationData);

    /**
     * Validate the nonce of the UserOperation.
     * This method may validate the nonce requirement of this account.
     * e.g.
     * To limit the nonce to use sequenced UserOps only (no "out of order" UserOps):
     *      `require(nonce < type(uint64).max)`
     * For a hypothetical account that *requires* the nonce to be out-of-order:
     *      `require(nonce & type(uint64).max == 0)`
     *
     * The actual nonce uniqueness is managed by the EntryPoint, and thus no other
     * action is needed by the account itself.
     *
     * @param nonce to validate
     *
     * solhint-disable-next-line no-empty-blocks
     */
    function _validateNonce(uint256 nonce) internal view virtual {
    }

    /**
     * sends to the entrypoint (msg.sender) the missing funds for this transaction.
     * subclass MAY override this method for better funds management
     * (e.g. send to the entryPoint more than the minimum required, so that in future transactions
     * it will not be required to send again)
     * @param missingAccountFunds the minimum value this method should send the entrypoint.
     *  this value MAY be zero, in case there is enough deposit, or the userOp has a paymaster.
     */
    function _payPrefund(uint256 missingAccountFunds) internal virtual {
        if (missingAccountFunds != 0) {
            (bool success,) = payable(msg.sender).call{value : missingAccountFunds, gas : type(uint256).max}("");
            (success);
            //ignore failure (its EntryPoint's job to verify, not account.)
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;


/* solhint-disable reason-string */

import "@openzeppelin/contracts/access/Ownable.sol";
import "../interfaces/IPaymaster.sol";
import "../interfaces/IEntryPoint.sol";
import "./Helpers.sol";

/**
 * Helper class for creating a paymaster.
 * provides helper methods for staking.
 * validates that the postOp is called only by the entryPoint
 */
abstract contract BasePaymaster is IPaymaster, Ownable {

    IEntryPoint immutable public entryPoint;

    constructor(IEntryPoint _entryPoint) {
        entryPoint = _entryPoint;
    }

    /// @inheritdoc IPaymaster
    function validatePaymasterUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 maxCost)
    external override returns (bytes memory context, uint256 validationData) {
         _requireFromEntryPoint();
        return _validatePaymasterUserOp(userOp, userOpHash, maxCost);
    }

    function _validatePaymasterUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 maxCost)
    internal virtual returns (bytes memory context, uint256 validationData);

    /// @inheritdoc IPaymaster
    function postOp(PostOpMode mode, bytes calldata context, uint256 actualGasCost) external override {
        _requireFromEntryPoint();
        _postOp(mode, context, actualGasCost);
    }

    /**
     * post-operation handler.
     * (verified to be called only through the entryPoint)
     * @dev if subclass returns a non-empty context from validatePaymasterUserOp, it must also implement this method.
     * @param mode enum with the following options:
     *      opSucceeded - user operation succeeded.
     *      opReverted  - user op reverted. still has to pay for gas.
     *      postOpReverted - user op succeeded, but caused postOp (in mode=opSucceeded) to revert.
     *                       Now this is the 2nd call, after user's op was deliberately reverted.
     * @param context - the context value returned by validatePaymasterUserOp
     * @param actualGasCost - actual gas used so far (without this postOp call).
     */
    function _postOp(PostOpMode mode, bytes calldata context, uint256 actualGasCost) internal virtual {

        (mode,context,actualGasCost); // unused params
        // subclass must override this method if validatePaymasterUserOp returns a context
        revert("must override");
    }

    /**
     * add a deposit for this paymaster, used for paying for transaction fees
     */
    function deposit() public payable {
        entryPoint.depositTo{value : msg.value}(address(this));
    }

    /**
     * withdraw value from the deposit
     * @param withdrawAddress target to send to
     * @param amount to withdraw
     */
    function withdrawTo(address payable withdrawAddress, uint256 amount) public onlyOwner {
        entryPoint.withdrawTo(withdrawAddress, amount);
    }
    /**
     * add stake for this paymaster.
     * This method can also carry eth value to add to the current stake.
     * @param unstakeDelaySec - the unstake delay for this paymaster. Can only be increased.
     */
    function addStake(uint32 unstakeDelaySec) external payable onlyOwner {
        entryPoint.addStake{value : msg.value}(unstakeDelaySec);
    }

    /**
     * return current paymaster's deposit on the entryPoint.
     */
    function getDeposit() public view returns (uint256) {
        return entryPoint.balanceOf(address(this));
    }

    /**
     * unlock the stake, in order to withdraw it.
     * The paymaster can't serve requests once unlocked, until it calls addStake again
     */
    function unlockStake() external onlyOwner {
        entryPoint.unlockStake();
    }

    /**
     * withdraw the entire paymaster's stake.
     * stake must be unlocked first (and then wait for the unstakeDelay to be over)
     * @param withdrawAddress the address to send withdrawn value.
     */
    function withdrawStake(address payable withdrawAddress) external onlyOwner {
        entryPoint.withdrawStake(withdrawAddress);
    }

    /// validate the call is made from a valid entrypoint
    function _requireFromEntryPoint() internal virtual {
        require(msg.sender == address(entryPoint), "Sender not EntryPoint");
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {
    BasePaymaster
} from "@account-abstraction/contracts/core/BasePaymaster.sol";
import {
    IEntryPoint
} from "@account-abstraction/contracts/interfaces/IEntryPoint.sol";
import {
    UserOperation
} from "@account-abstraction/contracts/interfaces/UserOperation.sol";
import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/EIP712.sol";

import {
    InspectablePaymasterInterface
} from "../interfaces/InspectablePaymasterInterface.sol";
import {
    CheckoutPaymasterEventsAndErrors
} from "./CheckoutPaymasterEventsAndErrors.sol";

enum ActiveState {
    UNSPECIFIED, // 0
    INACTIVE, // 1
    ACTIVE // 2
}

/**
 * @title CheckoutPaymaster
 * @author Fun.xyz
 */
contract CheckoutPaymaster is
    BasePaymaster,
    InspectablePaymasterInterface,
    EIP712,
    CheckoutPaymasterEventsAndErrors
{
    string public constant EIP712_NAME = "CheckoutPaymaster";
    string public constant VERSION = "2"; // Note: Was a uint256 in version 1.

    bytes32 private constant SPONSOR_USER_OP_TYPEHASH =
        keccak256(
            "SponsorUserOp("
            "bytes32 userOpHash,"
            "uint64 deadline"
            ")"
        );
    bytes1 private constant CONTEXT_ACTIVE = bytes1(uint8(0));
    bytes1 private constant CONTEXT_INACTIVE = bytes1(uint8(1));

    ActiveState internal _ACTIVE_STATE_;
    PostOpMode internal _LAST_OP_MODE_;

    mapping(address => bool) internal _OPERATORS_;
    mapping(address => bool) internal _SIGNERS_;
    mapping(bytes32 => bool) internal _SPONSORED_USER_OP_HASHES_;

    modifier onlyOperator() {
        if (!_OPERATORS_[msg.sender]) {
            revert OperatorNotAllowed(msg.sender);
        }
        _;
    }

    modifier activate() {
        _ACTIVE_STATE_ = ActiveState.ACTIVE;
        _;
        _ACTIVE_STATE_ = ActiveState.INACTIVE;
    }

    constructor(
        IEntryPoint entryPoint
    ) BasePaymaster(entryPoint) EIP712(EIP712_NAME, VERSION) {
        _ACTIVE_STATE_ = ActiveState.INACTIVE;
    }

    function setOperators(
        address[] calldata operators,
        bool isAllowed
    ) external onlyOwner {
        uint256 n = operators.length;
        for (uint256 i; i < n; ++i) {
            address operator = operators[i];
            _OPERATORS_[operator] = isAllowed;
            emit OperatorSet(operator, isAllowed);
        }
    }

    function setSigners(
        address[] calldata signers,
        bool isAllowed
    ) external onlyOwner {
        uint256 n = signers.length;
        for (uint256 i; i < n; ++i) {
            address signer = signers[i];
            _SIGNERS_[signer] = isAllowed;
            emit SignerSet(signer, isAllowed);
        }
    }

    function activateAndCall(
        address target,
        bytes calldata callData
    ) external payable onlyOperator activate returns (bytes memory) {
        (bool success, bytes memory returnData) = payable(target).call{
            value: msg.value
        }(callData);
        if (!success) {
            assembly {
                revert(add(returnData, 32), mload(returnData))
            }
        }
        return returnData;
    }

    function getLastOpMode() external view returns (PostOpMode) {
        return _LAST_OP_MODE_;
    }

    function isOperatorAllowed(address operator) external view returns (bool) {
        return _OPERATORS_[operator];
    }

    function isSignerAllowed(address signer) external view returns (bool) {
        return _SIGNERS_[signer];
    }

    function DOMAIN_SEPARATOR() external view virtual returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @notice Validate a user operation that is using this paymaster.
     *
     * @param userOp ERC-4337 UserOperation.
     *
     * @return context The context containing the sponsor, spender, gasPriceUserOp, and opHash.
     * @return validationData The validation result.
     */
    function _validatePaymasterUserOp(
        UserOperation calldata userOp,
        bytes32 /* opHash */,
        uint256 /* maxCost */
    ) internal override returns (bytes memory context, uint256 validationData) {
        // Assume paymasterAndData.length >= 20 based on reasonable EntryPoint behavior.
        uint256 len = userOp.paymasterAndData.length;
        if (len > 20) {
            // Format of paymasterAndData:
            //   -  [0:20]  address paymaster
            //   - [20:40]  address signer
            //   - [40:48]  uint64  deadline
            //   - [48:113] bytes   signature
            if (len != 113) {
                revert InvalidPaymasterAndDataLength(len);
            }

            address expectedSigner = address(
                bytes20(userOp.paymasterAndData[20:40])
            );
            uint64 deadline = uint64(bytes8(userOp.paymasterAndData[40:48]));
            bytes memory signature = userOp.paymasterAndData[48:];

            _validateSponsoredUserOp(
                signature,
                expectedSigner,
                deadline,
                userOp
            );

            context = abi.encodePacked(CONTEXT_ACTIVE);
        } else {
            context = abi.encodePacked(CONTEXT_INACTIVE);
        }
        validationData = 0;
    }

    /**
     * @notice Post-operation handler.
     * @dev Records the result of the user operation (e.g. success or revert).
     *
     *      Also, reverts if the paymaster was not active, ensuring that only allowed
     *      operators can make use of this paymaster.
     *
     * @param mode The mode enum representing the operation result.
     */
    function _postOp(
        PostOpMode mode,
        bytes calldata context,
        uint256 /* actualGasCost */
    ) internal override {
        if (
            context[0] == CONTEXT_INACTIVE &&
            _ACTIVE_STATE_ != ActiveState.ACTIVE
        ) {
            revert Inactive();
        }
        _LAST_OP_MODE_ = mode;
    }

    function _validateSponsoredUserOp(
        bytes memory signature,
        address expectedSigner,
        uint64 deadline,
        UserOperation calldata userOp
    ) internal {
        if (block.timestamp > deadline) {
            revert SignatureExpired(deadline);
        }

        if (!_SIGNERS_[expectedSigner]) {
            revert SignerNotAllowed(expectedSigner);
        }

        // Zero-out paymasterAndData before hashing the userOp.
        UserOperation memory userOpClone = userOp;
        userOpClone.paymasterAndData = bytes("");
        userOpClone.signature = bytes("");
        bytes32 userOpHash = entryPoint.getUserOpHash(userOpClone);

        bytes32 structHash = keccak256(
            abi.encode(SPONSOR_USER_OP_TYPEHASH, userOpHash, deadline)
        );

        bytes32 digest = _hashTypedDataV4(structHash);

        address recoveredSigner = ECDSA.recover(digest, signature);
        if (recoveredSigner != expectedSigner) {
            revert SignatureInvalid(recoveredSigner, expectedSigner);
        }

        if (_SPONSORED_USER_OP_HASHES_[userOpHash]) {
            revert SponsoredUserOpRepeated(userOpHash);
        }

        _SPONSORED_USER_OP_HASHES_[userOpHash] = true;

        emit UserOpSponsored(userOpHash);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

interface CheckoutPaymasterEventsAndErrors {
    error Inactive();
    error InvalidPaymasterAndDataLength(uint256 length);
    error OperatorNotAllowed(address operator);
    error SignerNotAllowed(address signer);
    error SignatureExpired(uint256 deadline);
    error SignatureInvalid(address recoveredSigner, address expectedSigner);
    error SponsoredUserOpRepeated(bytes32 userOpHash);

    event OperatorSet(address indexed operator, bool isAllowed);
    event SignerSet(address indexed signer, bool isAllowed);

    /// @dev Intentionally not indexed to save gas since most clients won't need this.
    event UserOpSponsored(bytes32 userOpHash);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {
    SimpleAccount
} from "@account-abstraction/contracts/samples/SimpleAccount.sol";
import {
    IEntryPoint
} from "@account-abstraction/contracts/interfaces/IEntryPoint.sol";
import {
    IPaymaster
} from "@account-abstraction/contracts/interfaces/IPaymaster.sol";
import {
    UserOperation
} from "@account-abstraction/contracts/interfaces/UserOperation.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import {
    Create2ForwarderFactory
} from "./forwarder/Create2ForwarderFactory.sol";
import {
    BridgeParams,
    CheckoutPoolInterface,
    CheckoutState,
    SwapParams
} from "./interfaces/CheckoutPoolInterface.sol";
import {
    CheckoutPoolEventsAndErrors
} from "./interfaces/CheckoutPoolEventsAndErrors.sol";
import {
    InspectablePaymasterInterface
} from "./interfaces/InspectablePaymasterInterface.sol";
import { CheckoutPaymaster } from "./paymaster/CheckoutPaymaster.sol";
import { GuardianOwnable } from "./utils/GuardianOwnable.sol";
import { WETH9Interface } from "./interfaces/WETH9Interface.sol";

contract CheckoutPool is
    GuardianOwnable,
    CheckoutPoolInterface,
    CheckoutPoolEventsAndErrors
{
    using SafeERC20 for IERC20;
    uint256 public timelockDuration = 1 days;

    IEntryPoint public immutable ENTRY_POINT;
    WETH9Interface public immutable WRAPPED_NATIVE_TOKEN;
    address public immutable NATIVE_TOKEN =
        address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
    address public immutable USDT_TOKEN =
        address(0xdAC17F958D2ee523a2206206994597C13D831ec7);    
    Create2ForwarderFactory public FORWARDER_FACTORY;
    address public operator;
    address public paymaster;

    bool public _ALLOW_ALL_;
    mapping(address target => bool isAllowed) public _ALLOWED_SWAP_TARGETS_;
    mapping(address target => bool isAllowed) public _ALLOWED_BRIDGE_TARGETS_;
    mapping(uint256 chainId => bool isAllowed) public _ALLOWED_CHAIN_IDS_;
    mapping(IERC20 asset => uint256 excessAmount) public _POOL_EXCESS_;
    mapping(bytes32 => uint256) public _TIMELOCK_EXPIRATION_;

    /// @dev Active checkout accounts.
    mapping(address depositAddress => CheckoutState checkout)
        internal _CHECKOUTS_;

    modifier allowedSwapTarget(address target) {
        if (!(_ALLOW_ALL_ || _ALLOWED_SWAP_TARGETS_[target])) {
            revert SwapTargetNotAllowed(target);
        }
        _;
    }

    modifier allowedBridgeTarget(address target) {
        if (!(_ALLOW_ALL_ || _ALLOWED_BRIDGE_TARGETS_[target])) {
            revert BridgeTargetNotAllowed(target);
        }
        _;
    }

    modifier notExpired(uint256 expiration) {
        if (block.timestamp >= expiration) {
            revert CheckoutExpired();
        }
        _;
    }

    modifier Timelock() {
        bytes32 hash = getCallHash(msg.sender, msg.data);
        uint256 expiration = _TIMELOCK_EXPIRATION_[hash];
        if (expiration == 0) {
            _TIMELOCK_EXPIRATION_[hash] = block.timestamp + timelockDuration;
        } else if (block.timestamp < expiration) {
            revert TimelockNotExpired(hash, expiration);
        } else {
            delete _TIMELOCK_EXPIRATION_[hash];
            _;
        }
    }

    modifier onlyOperator() {
        if (msg.sender != operator) {
            revert OnlyOperatorAllowed(msg.sender, operator);
        }
        _;
    }

    modifier onlyPaymaster() {
        if (msg.sender != paymaster) {
            revert OnlyPaymasterAllowed(msg.sender, paymaster);
        }
        _;
    }

    receive() external payable {}

    constructor(
        address guardian,
        IEntryPoint entryPoint,
        WETH9Interface wrappedNativeToken
    ) {
        _transferOwnership(guardian);
        ENTRY_POINT = entryPoint;
        WRAPPED_NATIVE_TOKEN = wrappedNativeToken;
        paymaster = address(0);
    }

    function setAllowAll(bool isAllowed) external onlyOwner {
        _ALLOW_ALL_ = isAllowed;
    }

    function setTimelockDuration(uint256 duration) external onlyOwner {
        timelockDuration = duration;
    }

    function setForwarderFactory(
        Create2ForwarderFactory fowarderFactory
    ) external onlyOwner {
        FORWARDER_FACTORY = fowarderFactory;
    }

    function setPaymaster(address newPaymaster) external onlyOwner {
        paymaster = newPaymaster;
    }

    function addAllowedSwapTargets(
        address[] calldata targets
    ) external onlyOwner Timelock {
        _updateAllowedSwapTargets(targets, true);
    }

    function addAllowedBridgeTargets(
        address[] calldata targets
    ) external onlyOwner Timelock {
        _updateAllowedBridgeTargets(targets, true);
    }
    function addAllowedChainIds(
        uint256[] calldata chainIds
    ) external onlyOwner Timelock {
        _updateAllowedChainIds(chainIds, true);
    }

    function removeAllowedSwapTargets(
        address[] calldata targets
    ) external onlyOwner {
        _updateAllowedSwapTargets(targets, false);
    }

    function removeAllowedBridgeTargets(
        address[] calldata targets
    ) external onlyOwner {
        _updateAllowedBridgeTargets(targets, false);
    }

    function removeAllowedChainIds(
        uint256[] calldata chainIds
    ) external onlyOwner {
        _updateAllowedChainIds(chainIds, false);
    }

    function setOperator(address newOperator) external onlyOwner {
        operator = newOperator;
    }

    function addExcessToPool(IERC20 asset, uint256 amount) external {
        _POOL_EXCESS_[asset] += amount;

        asset.safeTransferFrom(msg.sender, address(this), amount);

        emit ExcessAdded(asset, amount);
    }

    function removeExcessFromPool(
        IERC20 asset,
        uint256 amount
    ) external onlyOwner {
        // Will revert if amount is greater than excess balance.
        _POOL_EXCESS_[asset] -= amount;

        asset.safeTransfer(msg.sender, amount);

        emit ExcessRemoved(asset, amount);
    }

    /**
     * @notice Deposit funds to create a checkout account.
     */
    function deposit(
        CheckoutState calldata checkout
    ) external notExpired(checkout.params.expiration) {
        address depositAddress = msg.sender;

        checkout.heldAsset.safeTransferFrom(
            depositAddress,
            address(this),
            checkout.heldAmount
        );

        _CHECKOUTS_[depositAddress] = checkout;

        emit Deposited(depositAddress, checkout.heldAsset, checkout.heldAmount);
    }

    function swap(
        address depositAddress,
        SwapParams calldata swapParams
    )
        external
        notExpired(_CHECKOUTS_[depositAddress].params.expiration)
        allowedSwapTarget(swapParams.target)
        onlyOperator
    {
        // Read checkout state from storage.
        CheckoutState storage checkout = _getCheckout(depositAddress);
        IERC20 heldAsset = checkout.heldAsset;
        uint256 heldAmount = checkout.heldAmount;

        // Set the allowance on the swap spender.
        //
        // Note: Using approve() instead of safeIncreaseAllowance() or forceApprove() under the
        // assumption that all allowances from this contract will be zero in between transactions.
        // We have a condition here if it is USDT, where we will perform a safeApprove as USDT does not return any value
        if (block.chainid == 1 && address(heldAsset) == USDT_TOKEN) {
            heldAsset.safeApprove(swapParams.spender, heldAmount);
        } else {
            heldAsset.approve(swapParams.spender, heldAmount);
        }

        // Get starting balance of the asset to receive from the swap.
        uint256 balanceBefore;
        if (address(swapParams.receivedAsset) == NATIVE_TOKEN) {
            balanceBefore = address(this).balance;
        } else {
            balanceBefore = IERC20(swapParams.receivedAsset).balanceOf(
                address(this)
            );
        }

        bool success;
        bytes memory returnData;
        // Execute the swap.
        if (swapParams.isETHSwap) {
            require(
                heldAsset == WRAPPED_NATIVE_TOKEN,
                "Held asset must be WETH for ETH swaps"
            );
            WETH9Interface(WRAPPED_NATIVE_TOKEN).withdraw(heldAmount);
            (success, returnData) = swapParams.target.call{value: heldAmount}(
                swapParams.callData
            );
        } else {
            // Set the allowance on the swap spender.
            //
            // Note: Using approve() instead of safeIncreaseAllowance() or forceApprove() under the
            // assumption that all allowances from this contract will be zero in between transactions.
            heldAsset.approve(swapParams.spender, heldAmount);

            (success, returnData) = swapParams.target.call(
                swapParams.callData
            );

            // Require that the full allowance was spent.
            //
            // IMPORTANT NOTE: We assume the swap contract supports spending an exact amount.
            //
            // Note: This check will fail with some ERC-20 implementations in the case
            // where heldAmount = type(uint256).max. We assume that this is impossible in practice.
            uint256 remainingAllowance = heldAsset.allowance(
                address(this),
                swapParams.spender
            );
            if (remainingAllowance != 0) {
                revert SwapDidNotSpendExactAmount(remainingAllowance);
            }
        }
        if (!success) {
            revert SwapReverted(returnData);
        }
        uint256 receivedAmount;
        IERC20 receivedAsset;
        if (address(swapParams.receivedAsset) == NATIVE_TOKEN) {
            // Note: The tx will revert if the received asset balance decreased.
            receivedAmount = address(this).balance - balanceBefore;
            WRAPPED_NATIVE_TOKEN.deposit{value: receivedAmount}();
            receivedAsset = WRAPPED_NATIVE_TOKEN;
        } else {
            uint256 balanceAfter = IERC20(swapParams.receivedAsset).balanceOf(
                address(this)
            );
            // Note: The tx will revert if the received asset balance decreased.
            receivedAmount = balanceAfter - balanceBefore;
            receivedAsset = IERC20(swapParams.receivedAsset);
        }

        // Write checkout state to storage.
        checkout.heldAsset = receivedAsset;
        checkout.heldAmount = receivedAmount;

        emit Swapped(
            depositAddress,
            swapParams.target,
            receivedAsset,
            receivedAmount
        );
    }

    function bridge(
        address depositAddress,
        BridgeParams calldata bridgeParams
    )
        external
        notExpired(_CHECKOUTS_[depositAddress].params.expiration)
        allowedBridgeTarget(bridgeParams.target)
        onlyOperator
    {
        // Read checkout state from storage.
        // Note: Read the whole thing into memory since we use it later.
        CheckoutState memory checkout = _getCheckout(depositAddress);
        IERC20 heldAsset = checkout.heldAsset;
        uint256 heldAmount = checkout.heldAmount;
        uint256 targetChainId = checkout.params.targetChainId;

        // Sanity check that we are not already on the target chain.
        if (targetChainId == block.chainid) {
            revert BridgeAlreadyOnTargetChain();
        }

        // Require that the chain ID is allowed/supported.
        if (!(_ALLOW_ALL_ || _ALLOWED_CHAIN_IDS_[targetChainId])) {
            revert BridgeChainIdNotAllowed(targetChainId);
        }

        // Set the allowance on the swap spender.
        //
        // Note: Using approve() instead of safeIncreaseAllowance() or forceApprove() under the
        // assumption that all allowances from this contract will be zero in between transactions.
        // We have a condition here if it is USDT, where we will perform a safeApprove as USDT does not return any value
        if (block.chainid == 1 && address(heldAsset) == USDT_TOKEN) {
            heldAsset.safeApprove(bridgeParams.spender, heldAmount);
        } else {
            heldAsset.approve(bridgeParams.spender, heldAmount);
        }

        bytes32 salt = keccak256(abi.encodePacked(blockhash(block.number - 1)));

        // Get the counterfactual deployment deposit address for the target chain.
        //
        // IMPORTANT NOTE: This implementation assumes that the forwarder factory has the same
        // address on each chain. This has to be ensured before a chain ID is added to the allowed
        // list of target chain IDs.
        CheckoutState memory bridgedCheckout = CheckoutState({
            params: checkout.params,
            heldAsset: bridgeParams.bridgeReceivedAsset,
            heldAmount: bridgeParams.minBridgeReceivedAmount
        });
        address targetChainDepositAddress = FORWARDER_FACTORY
            .getAddressForChain(bridgedCheckout, salt, targetChainId);

        // Execute the bridge call.
        _bridgeToRecipient(
            bridgeParams.target,
            bridgeParams.callData,
            targetChainDepositAddress
        );

        // Require that the full allowance was spent.
        //
        // IMPORTANT NOTE: We assume the bridge contract supports spending an exact amount.
        uint256 remainingAllowance = heldAsset.allowance(
            address(this),
            bridgeParams.spender
        );
        if (remainingAllowance != 0) {
            revert BridgeDidNotSpendExactAmount(remainingAllowance);
        }

        // Delete the checkout from storage.
        delete _CHECKOUTS_[depositAddress];

        emit Bridged(
            depositAddress,
            targetChainDepositAddress,
            bridgeParams.target,
            bridgeParams.bridgeReceivedAsset,
            bridgeParams.minBridgeReceivedAmount
        );
    }

    // apply to non userOp execution cases
    function forwardFund(
        address depositAddress
    )
        external
        notExpired(_CHECKOUTS_[depositAddress].params.expiration)
        onlyOperator
    {
        CheckoutState storage checkout = _getCheckout(depositAddress);

        if (block.chainid != checkout.params.targetChainId) {
            revert ForwardFundChainNotReady(block.chainid);
        }

        if (checkout.params.recipient == bytes32(0)) {
            revert ForwardFundRecipientNotSet();
        }

        if (checkout.params.userOpHash != bytes32(0)) {
            revert ForwardFundUserOpHashIsSet(checkout.params.userOpHash);
        }

        IERC20 heldAsset = checkout.heldAsset;
        uint256 heldAmount = checkout.heldAmount;

        uint256 forwardAmount = checkout.params.targetAmount;
        checkout.params.targetAmount = 0;
        if (forwardAmount < heldAmount) {
            _POOL_EXCESS_[heldAsset] += heldAmount - forwardAmount;
        } else if (forwardAmount > heldAmount) {
            uint256 oldExcessAmount = _POOL_EXCESS_[heldAsset];
            uint256 excessSpend = forwardAmount - heldAmount;
            if (oldExcessAmount < excessSpend) {
                revert ExecuteInsufficientExcessBalance(
                    oldExcessAmount,
                    forwardAmount,
                    heldAmount
                );
            }
            _POOL_EXCESS_[heldAsset] = oldExcessAmount - excessSpend;
        }

        address targetAssetAddr = address(
            uint160(uint256(checkout.params.targetAsset))
        );
        address recipientAddr = address(
            uint160(uint256(checkout.params.recipient))
        );
        if (targetAssetAddr == NATIVE_TOKEN) {
            if (heldAsset != WRAPPED_NATIVE_TOKEN) {
                revert ForwardFundAssetNotReady(heldAsset);
            } else {
                WRAPPED_NATIVE_TOKEN.withdraw(forwardAmount);
                (bool success, ) = payable(recipientAddr).call{
                    value: forwardAmount
                }("");
                require(success, "failed to forward fund");
            }
        } else if (heldAsset != IERC20(targetAssetAddr)) {
            revert ForwardFundAssetNotReady(heldAsset);
        } else if (heldAsset == IERC20(targetAssetAddr)) {
            heldAsset.safeTransfer(recipientAddr, forwardAmount);
        } else {
            revert ForwardFundAssetNotReady(heldAsset);
        }

        // Delete the checkout from storage.
        delete _CHECKOUTS_[depositAddress];

        emit FundForwarded(
            depositAddress,
            forwardAmount,
            checkout.params.recipient
        );
    }

    function executeWithPaymaster(
        CheckoutPaymaster _paymaster,
        address depositAddress,
        UserOperation[] calldata ops
    ) external onlyOperator {
        bytes memory callData = abi.encodeWithSelector(
            this.execute.selector,
            depositAddress,
            ops
        );
        _paymaster.activateAndCall(address(this), callData);
    }

    function execute(
        address depositAddress,
        UserOperation[] calldata ops
    )
        external
        notExpired(_CHECKOUTS_[depositAddress].params.expiration)
        onlyPaymaster
    {
        // Note: Currently having execute() take an array UserOperation[] in case this is more
        // gas efficient than creating the array explicitly in order to call handleOps(). (?)
        if (ops.length != 1) {
            revert ExecuteInvalidOpsLength();
        }

        CheckoutState storage checkout = _getCheckout(depositAddress);
        IERC20 heldAsset = checkout.heldAsset;
        uint256 heldAmount = checkout.heldAmount;

        if (block.chainid != checkout.params.targetChainId) {
            revert ExecuteChainNotReady(block.chainid);
        }

        bytes32 calculatedUserOpHash = ENTRY_POINT.getUserOpHash(ops[0]);
        if (calculatedUserOpHash != checkout.params.userOpHash) {
            revert ExecuteInvalidUserOp(calculatedUserOpHash);
        }

        // Add or subtract from the excess amount in the pool, depending on whether the
        // execution amount is greater or less than the held amount.
        uint256 executionAmount = checkout.params.targetAmount;
        checkout.params.targetAmount = 0;
        if (executionAmount < heldAmount) {
            _POOL_EXCESS_[heldAsset] += heldAmount - executionAmount;
        } else if (executionAmount > heldAmount) {
            uint256 oldExcessAmount = _POOL_EXCESS_[heldAsset];
            uint256 excessSpend = executionAmount - heldAmount;
            if (oldExcessAmount < excessSpend) {
                revert ExecuteInsufficientExcessBalance(
                    oldExcessAmount,
                    executionAmount,
                    heldAmount
                );
            }
            _POOL_EXCESS_[heldAsset] = oldExcessAmount - excessSpend;
        }

        address targetAssetAddr = address(
            uint160(uint256(checkout.params.targetAsset))
        );
        // Send the execution amount to the userOp sender and execute the userOp.
        if (targetAssetAddr == NATIVE_TOKEN) {
            if (heldAsset != WRAPPED_NATIVE_TOKEN) {
                revert ExecuteAssetNotReady(heldAsset);
            } else {
                WRAPPED_NATIVE_TOKEN.withdraw(executionAmount);
                (bool success, ) = payable(ops[0].sender).call{
                    value: executionAmount
                }("");
                require(success, "failed to send fund before execute userOp");
            }
        } else if (heldAsset != IERC20(targetAssetAddr)) {
            revert ExecuteAssetNotReady(heldAsset);
        } else if (heldAsset == IERC20(targetAssetAddr)) {
            heldAsset.safeTransfer(ops[0].sender, executionAmount);
        } else {
            revert ExecuteAssetNotReady(heldAsset);
        }

        ENTRY_POINT.handleOps(ops, payable(guardian()));

        // Revert if the userOp reverted.
        {
            address paymasterAddress = address(
                bytes20(ops[0].paymasterAndData[:20])
            );
            IPaymaster.PostOpMode userOpMode = InspectablePaymasterInterface(
                paymasterAddress
            ).getLastOpMode();
            if (userOpMode != IPaymaster.PostOpMode.opSucceeded) {
                revert ExecuteUserOpReverted(userOpMode);
            }
        }

        // Delete the checkout from storage.
        delete _CHECKOUTS_[depositAddress];

        emit Executed(depositAddress, executionAmount);
    }

    function checkoutExists(
        address depositAddress
    ) external view returns (bool) {
        return _CHECKOUTS_[depositAddress].params.targetAsset != bytes32(0);
    }

    function getCheckout(
        address depositAddress
    ) external view returns (CheckoutState memory) {
        return _getCheckout(depositAddress);
    }

    function getCheckoutOrZero(
        address depositAddress
    ) external view returns (CheckoutState memory) {
        return _CHECKOUTS_[depositAddress];
    }

    function _getCheckout(
        address depositAddress
    ) internal view returns (CheckoutState storage) {
        CheckoutState storage checkout = _CHECKOUTS_[depositAddress];
        if (checkout.params.targetAsset == bytes32(0)) {
            revert CheckoutDoesNotExist();
        }
        return checkout;
    }

    function _updateAllowedSwapTargets(
        address[] calldata targets,
        bool isAllowed
    ) internal {
        uint256 n = targets.length;
        for (uint256 i; i < n; ++i) {
            address target = targets[i];
            _ALLOWED_SWAP_TARGETS_[target] = isAllowed;
            emit UpdatedAllowedSwapTarget(target, isAllowed);
        }
    }

    function _updateAllowedBridgeTargets(
        address[] calldata targets,
        bool isAllowed
    ) internal {
        uint256 n = targets.length;
        for (uint256 i; i < n; ++i) {
            address target = targets[i];
            _ALLOWED_BRIDGE_TARGETS_[target] = isAllowed;
            emit UpdatedAllowedBridgeTarget(target, isAllowed);
        }
    }

    function _updateAllowedChainIds(
        uint256[] calldata chainids,
        bool isAllowed
    ) internal {
        uint256 n = chainids.length;
        for (uint256 i; i < n; ++i) {
            uint256 chainId = chainids[i];
            _ALLOWED_CHAIN_IDS_[chainId] = isAllowed;
            emit UpdatedAllowedChainIds(chainId, isAllowed);
        }
    }

    function _bridgeToRecipient(
        address target,
        bytes calldata callData,
        address targetChainDepositAddress
    ) internal {
        // as needed.
        (bool success, bytes memory returnData) = target.call(callData);
        if (!success) {
            revert BridgeReverted(returnData);
        }
    }

    function getCallHash(
        address sender,
        bytes calldata callData
    ) internal pure returns (bytes32) {
        return keccak256(abi.encode(sender, callData));
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {
    IPaymaster
} from "@account-abstraction/contracts/interfaces/IPaymaster.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface CheckoutPoolEventsAndErrors {
    error CheckoutDoesNotExist();
    error CheckoutExpired();
    error SwapTargetNotAllowed(address target);
    error SwapDidNotSpendExactAmount(uint256 remainingAllowance);
    error SwapReverted(bytes errorData);
    error BridgeChainIdNotAllowed(uint256 chainId);
    error BridgeTargetNotAllowed(address target);
    error BridgeAlreadyOnTargetChain();
    error BridgeDidNotSpendExactAmount(uint256 remainingAllowance);
    error BridgeReverted(bytes errorData);
    error ExecuteInvalidOpsLength();
    error ExecuteChainNotReady(uint256 chainId);
    error ExecuteAssetNotReady(IERC20 heldAsset);
    error ExecuteInsufficientExcessBalance(
        uint256 oldExcessAmount,
        uint256 executionAmount,
        uint256 heldAmount
    );
    error ExecuteInvalidUserOp(bytes32 calculatedUserOpHash);
    error ExecuteUserOpReverted(IPaymaster.PostOpMode userOpMode);
    error TimelockNotExpired(bytes32 callHash, uint256 expiration);
    error OnlyOperatorAllowed(address caller, address operator);
    error OnlyPaymasterAllowed(address caller, address paymaster);
    error ForwardFundChainNotReady(uint256 chainId);
    error ForwardFundUserOpHashIsSet(bytes32);
    error ForwardFundAssetNotReady(IERC20 asset);
    error ForwardFundInsufficientExcessBalance(
        uint256 oldExcessAmount,
        uint256 forwardAmount,
        uint256 heldAmount
    );
    error ForwardFundRecipientNotSet();

    event UpdatedAllowedSwapTarget(address indexed target, bool isAllowed);
    event UpdatedAllowedBridgeTarget(address indexed target, bool isAllowed);
    event UpdatedAllowedChainIds(uint256 indexed chainId, bool isAllowed);

    event ExcessAdded(IERC20 indexed asset, uint256 amount);
    event ExcessRemoved(IERC20 indexed asset, uint256 amount);

    event Deposited(
        address indexed depositAddress,
        IERC20 receivedAsset,
        uint256 receivedAmount
    );

    event Bridged(
        address indexed depositAddress,
        address indexed targetChainDepositAddress,
        address indexed bridgeTarget,
        IERC20 receivedAsset,
        uint256 minReceivedAmount
    );

    event Swapped(
        address indexed depositAddress,
        address indexed swapTarget,
        IERC20 receivedAsset,
        uint256 receivedAmount
    );

    event Executed(address indexed depositAddress, uint256 executionAmount);
    event FundForwarded(
        address indexed depositAddress,
        uint256 forwardAmount,
        bytes32 indexed recipient
    );
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {
    UserOperation
} from "@account-abstraction/contracts/interfaces/UserOperation.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @dev Immutable parameters of a checkout account.
struct CheckoutParams {
    bytes32 userOpHash;
    bytes32 targetAsset;
    uint96 targetChainId;
    uint128 targetAmount;
    uint128 expiration;
    bytes32 recipient;
}

/// @dev State of a checkout account.
struct CheckoutState {
    CheckoutParams params;
    IERC20 heldAsset;
    uint256 heldAmount;
}

struct SwapParams {
    address target;
    address spender;
    bytes callData;
    address receivedAsset;
    bool isETHSwap;
}

struct BridgeParams {
    address target;
    address spender;
    bytes callData;
    IERC20 bridgeReceivedAsset;
    uint256 minBridgeReceivedAmount;
}

interface CheckoutPoolInterface {
    function deposit(CheckoutState calldata checkoutState) external;

    function swap(
        address depositAddress,
        SwapParams calldata swapParams
    ) external;

    function bridge(
        address depositAddress,
        BridgeParams calldata bridgeParams
    ) external;

    function execute(
        address depositAddress,
        UserOperation[] calldata ops // length-1 array (gas optimization)
    ) external;

    function checkoutExists(
        address depositAddress
    ) external view returns (bool);

    function getCheckout(
        address depositAddress
    ) external view returns (CheckoutState memory);

    function getCheckoutOrZero(
        address depositAddress
    ) external view returns (CheckoutState memory);

    function forwardFund(address depositAddress) external;
}

// 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: UNLICENSED
pragma solidity ^0.8.13;

interface Create2ForwarderEventsAndErrors {
    error AlreadyForwarded();
    error ForwardError(bytes errorData);
    error Underfunded(uint256 actualHeldAmount, uint256 minSourceAmount);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import { CheckoutPoolInterface } from "../interfaces/CheckoutPoolInterface.sol";
import {
    Create2ForwarderInterface
} from "../interfaces/Create2ForwarderInterface.sol";
import {
    Create2ForwarderFactoryInterface
} from "../interfaces/Create2ForwarderFactoryInterface.sol";
import { CheckoutState } from "../interfaces/CheckoutPoolInterface.sol";
import { WETH9Interface } from "../interfaces/WETH9Interface.sol";
import { Create2ForwarderImpl } from "../forwarder/Create2ForwarderImpl.sol";
import { Create2ForwarderProxy } from "./Create2ForwarderProxy.sol";

/**
 * @title Create2ForwarderFactory
 * @author Fun.xyz
 *
 * @notice Factory for “counterfactual” forwarder contracts for the Checkout Pools protocol.
 *
 *  A forwarder contract is created for each checkout operation executed by the protocol.
 *  It is the entry point for funds into the protocol.
 *
 *  Before the forwarder contract is deployed, its CREATE2 address (the “deposit address”)
 *  is calculated, so that the contract can be deployed only as needed, after funds have
 *  been deposited.
 *
 *  As a gas optimization, each forwarder contract is deployed as a proxy. All of the proxy
 *  contracts reference the same implementation logic, which is a constant on the factory contract.
 *
 *  As a gas optimization, checkout parameters that are not expected to change (often) are
 *  stored as constants on the factory contract. Parameters that do not need to be stored
 *  on-chain (e.g. the full user operation) are expected to be stored off-chain by the liquidity
 *  provider that is responsible for executing the checkout.
 *
 *  Constants (same for all forwarders created by the factory).
 *    - source chain
 *    - guardian address
 *    - CheckoutPools contract address (corresponds to a liquidity provider)
 *    - wrapped native token address
 *
 *  On-chain configuration (different for each forwarder / checkout operation)
 *    - user op hash
 *    - target chain
 *    - target asset and amount
 *    - source asset and amount
 *    - expiration timestamp
 *    - salt (not stored)
 *
 *  Off-chain configuration
 *    - user op
 */
contract Create2ForwarderFactory is Create2ForwarderFactoryInterface {
    error ErrorCreatingProxy();

    Create2ForwarderImpl public immutable IMPLEMENTATION;

    constructor(
        address guardian,
        WETH9Interface wrappedNativeToken,
        CheckoutPoolInterface checkoutPool
    ) {
        IMPLEMENTATION = new Create2ForwarderImpl(
            guardian,
            wrappedNativeToken,
            checkoutPool
        );
    }

    function create(
        CheckoutState calldata checkout,
        bytes32 salt
    ) external returns (Create2ForwarderInterface) {
        return _create(checkout, salt);
    }

    function createAndForward(
        CheckoutState calldata checkout,
        bytes32 salt
    ) external returns (Create2ForwarderInterface) {
        Create2ForwarderInterface proxy = _create(checkout, salt);
        proxy.forward();
        return proxy;
    }

    function getAddress(
        CheckoutState calldata checkout,
        bytes32 salt
    ) external view returns (address payable) {
        return _getAddress(checkout, salt, block.chainid);
    }

    /**
     * @notice Get the deposit address for a target chain ID.
     *
     *  IMPORTANT NOTE: This implementation assumes that the forwarder factory has the same
     *  address on each chain. This has to be ensured before a chain ID is added to the allowed
     *  list of target chain IDs on the CheckoutPools contract.
     */
    function getAddressForChain(
        CheckoutState calldata checkout,
        bytes32 salt,
        uint256 chainId
    ) external view returns (address payable) {
        return _getAddress(checkout, salt, chainId);
    }

    function getProxyCreationCode() external pure returns (bytes memory) {
        return type(Create2ForwarderProxy).creationCode;
    }

    function _create(
        CheckoutState calldata checkout,
        bytes32 salt
    ) internal returns (Create2ForwarderInterface) {
        Create2ForwarderProxy deployed = new Create2ForwarderProxy{
            salt: salt
        }(IMPLEMENTATION, checkout, block.chainid);

        Create2ForwarderInterface proxy = Create2ForwarderInterface(
            address(deployed)
        );
        return proxy;
    }

    function _getAddress(
        CheckoutState calldata checkout,
        bytes32 salt,
        uint256 chainId
    ) internal view returns (address payable) {
        bytes32 digest = keccak256(
            abi.encodePacked(
                bytes1(0xff),
                address(this),
                salt,
                keccak256(
                    abi.encodePacked(
                        type(Create2ForwarderProxy).creationCode,
                        abi.encode(IMPLEMENTATION, checkout, chainId)
                    )
                )
            )
        );
        return payable(address(uint160(uint256(digest))));
    }
}

// Compare with:
// function create3(bytes32 _salt, bytes memory _creationCode, uint256 _value) internal returns (address addr) {
//     // Creation code
//     bytes memory creationCode = PROXY_CHILD_BYTECODE;

//     // Get target final address
//     addr = addressOf(_salt);
//     if (codeSize(addr) != 0) revert TargetAlreadyExists();

//     // Create CREATE2 proxy
//     address proxy; assembly { proxy := create2(0, add(creationCode, 32), mload(creationCode), _salt)}
//     if (proxy == address(0)) revert ErrorCreatingProxy();

//     // Call proxy with final init code
//     (bool success,) = proxy.call{ value: _value }(_creationCode);
//     if (!success || codeSize(addr) == 0) revert ErrorCreatingContract();
// }

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import {
    Create2ForwarderInterface
} from "../interfaces/Create2ForwarderInterface.sol";
import { CheckoutState } from "./CheckoutPoolInterface.sol";

interface Create2ForwarderFactoryInterface {
    function createAndForward(
        CheckoutState calldata checkout,
        bytes32 salt
    ) external returns (Create2ForwarderInterface);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import { CheckoutPoolInterface } from "../interfaces/CheckoutPoolInterface.sol";
import {
    Create2ForwarderInterface
} from "../interfaces/Create2ForwarderInterface.sol";
import {
    Create2ForwarderEventsAndErrors
} from "../interfaces/Create2ForwarderEventsAndErrors.sol";
import { WETH9Interface } from "../interfaces/WETH9Interface.sol";
import {
    CheckoutParams,
    CheckoutState
} from "../interfaces/CheckoutPoolInterface.sol";
import { GuardianRescuable } from "../utils/GuardianRescuable.sol";
import { Create2ForwarderProxy } from "./Create2ForwarderProxy.sol";

/**
 * @title Create2ForwarderImpl
 * @author Fun.xyz
 *
 * @notice A forwarder contract (a.k.a. “deposit address”) for the Checkout Pools protocol.
 *
 *  See Create2ForwarderFactory and Create2ForwarderProxy for more info.
 */
contract Create2ForwarderImpl is
    GuardianRescuable,
    Create2ForwarderInterface,
    Create2ForwarderEventsAndErrors
{
    using SafeERC20 for IERC20;
    address public immutable GUARDIAN;
    WETH9Interface public immutable WRAPPED_NATIVE_TOKEN;
    CheckoutPoolInterface public immutable CHECKOUT_POOL;

    address public immutable USDT_TOKEN = address(0xdAC17F958D2ee523a2206206994597C13D831ec7);  

    bool internal _FORWARDED_;

    receive() external payable {}

    /**
     * @notice Implementation constructor.
     *
     *  Sets immutable values that are the same across all deployed proxies.
     */
    constructor(
        address initialGuardian,
        WETH9Interface wrappedNativeToken,
        CheckoutPoolInterface checkoutPool
    ) {
        GUARDIAN = initialGuardian;
        WRAPPED_NATIVE_TOKEN = wrappedNativeToken;
        CHECKOUT_POOL = checkoutPool;
    }

    function guardian() public override view returns (address) {
        return GUARDIAN;
    }

    /**
     * @notice Forward deposited funds to the CheckoutPool contract.
     */
    function forward() external {
        // Forward at most once.
        if (_FORWARDED_) {
            revert AlreadyForwarded();
        }
        _FORWARDED_ = true;

        // Read checkout state from proxy immutable configuration.
        CheckoutState memory checkout = Create2ForwarderProxy(payable(this))
            .getCheckout();
        IERC20 heldAsset = checkout.heldAsset;
        uint256 minSourceAmount = checkout.heldAmount;

        // Get native value.
        uint256 value = address(this).balance;

        // Convert any native value to wrapped native token.
        if (value != 0) {
            // Note: Intentionally not sanity checking that ERC20 == WRAPPED_NATIVE_TOKEN
            //       since that's of little help at this point, if the contract is misconfigured.
            WRAPPED_NATIVE_TOKEN.deposit{ value: value }();
        }

        // Get actual held amount.
        uint256 actualHeldAmount = heldAsset.balanceOf(address(this));

        // Validate and possibly overwrite the source amount.
        if (actualHeldAmount < minSourceAmount) {
            revert Underfunded(actualHeldAmount, minSourceAmount);
        } else if (actualHeldAmount > minSourceAmount) {
            checkout.heldAmount = actualHeldAmount;
        }

        // Note: Using approve() instead of safeIncreaseAllowance() or forceApprove() under the
        // assumption that all allowances from this contract will be zero in between transactions.
        // We have a condition here if it is USDT, where we will perform a safeApprove as USDT does not return any value
        if (block.chainid == 1 && address(heldAsset) == USDT_TOKEN) {
            heldAsset.safeApprove(address(CHECKOUT_POOL), type(uint256).max);
        } else {
            heldAsset.approve(address(CHECKOUT_POOL), type(uint256).max);
        }

        // Make the external call, reverting on failure.
        try CHECKOUT_POOL.deposit(checkout) {} catch (bytes memory errorData) {
            revert ForwardError(errorData);
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

interface Create2ForwarderInterface {
    function forward() external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { Proxy } from "@openzeppelin/contracts/proxy/Proxy.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import { Create2ForwarderImpl } from "../forwarder/Create2ForwarderImpl.sol";
import { WETH9Interface } from "../interfaces/WETH9Interface.sol";
import { GuardianOwnable } from "../utils/GuardianOwnable.sol";

import {
    CheckoutParams,
    CheckoutState
} from "../interfaces/CheckoutPoolInterface.sol";

/**
 * @title Create2ForwarderProxy
 * @author Fun.xyz
 *
 * @notice A forwarder contract proxy (a.k.a. “deposit address”) for the Checkout Pools protocol.
 *
 *  Intended to be deployed as a “counterfactual” contract.
 *
 *  See Create2ForwarderFactory and Create2ForwarderImpl for more info.
 */
contract Create2ForwarderProxy is Proxy {
    using SafeERC20 for IERC20;

    Create2ForwarderImpl internal immutable IMPLEMENTATION;

    // Expand out the CheckoutState struct so that it can be stored as immutables.
    bytes32 public immutable USER_OP_HASH;
    uint96 public immutable TARGET_CHAIN_ID;
    bytes32 public immutable TARGET_ASSET;
    uint128 public immutable TARGET_AMOUNT;
    uint128 public immutable EXPIRATION;
    bytes32 public immutable RECIPIENT;
    IERC20 public immutable HELD_ASSET; // Here represents the source asset.
    uint256 public immutable HELD_AMOUNT; // Here represents the min source amount.

    receive() external payable override {}

    /**
     * @notice Proxy constructor.
     *
     *  Sets immutable values that are different between deployed proxy instances.
     *
     *  IMPORTANT: Include chain ID in the constructor to ensure that the deposit address is
     *  unique for all checkout operations globally. This reduces confusion and allows us to use
     *  the deposit address as a unique ID in off-chain services. Note that we include the
     *  chain ID as a constructor param instead of hashing it into the salt, for gas efficiency.
     *
     *  The heldAsset and heldAmount are included in the constructor to ensure that it is possible
     *  to prove whether a liquidity provider is censoring checkouts (differenting this from the
     *  case where checkouts are under-funded).
     */
    constructor(
        Create2ForwarderImpl implementation,
        CheckoutState memory checkout,
        uint256 /* chainId */
    ) {
        IMPLEMENTATION = implementation;

        USER_OP_HASH = checkout.params.userOpHash;
        TARGET_ASSET = checkout.params.targetAsset;
        TARGET_CHAIN_ID = checkout.params.targetChainId;
        TARGET_AMOUNT = checkout.params.targetAmount;
        EXPIRATION = checkout.params.expiration;
        RECIPIENT = checkout.params.recipient;
        HELD_ASSET = checkout.heldAsset;
        HELD_AMOUNT = checkout.heldAmount;
    }

    function getCheckout()
        external
        view
        returns (CheckoutState memory checkout)
    {
        return
            CheckoutState({
                params: CheckoutParams({
                    userOpHash: USER_OP_HASH,
                    targetAsset: TARGET_ASSET,
                    targetChainId: TARGET_CHAIN_ID,
                    targetAmount: TARGET_AMOUNT,
                    expiration: EXPIRATION,
                    recipient: RECIPIENT
                }),
                heldAsset: HELD_ASSET,
                heldAmount: HELD_AMOUNT
            });
    }

    function _implementation() internal view override returns (address) {
        return address(IMPLEMENTATION);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

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

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

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

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

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

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

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

        return (signer, RecoverError.NoError);
    }

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

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }

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

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x00", validator, data));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/EIP712.sol)

pragma solidity ^0.8.8;

import "./ECDSA.sol";
import "../ShortStrings.sol";
import "../../interfaces/IERC5267.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * NOTE: In the upgradeable version of this contract, the cached values will correspond to the address, and the domain
 * separator of the implementation contract. This will cause the `_domainSeparatorV4` function to always rebuild the
 * separator from the immutable values, which is cheaper than accessing a cached version in cold storage.
 *
 * _Available since v3.4._
 *
 * @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
 */
abstract contract EIP712 is IERC5267 {
    using ShortStrings for *;

    bytes32 private constant _TYPE_HASH =
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");

    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _cachedDomainSeparator;
    uint256 private immutable _cachedChainId;
    address private immutable _cachedThis;

    bytes32 private immutable _hashedName;
    bytes32 private immutable _hashedVersion;

    ShortString private immutable _name;
    ShortString private immutable _version;
    string private _nameFallback;
    string private _versionFallback;

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        _name = name.toShortStringWithFallback(_nameFallback);
        _version = version.toShortStringWithFallback(_versionFallback);
        _hashedName = keccak256(bytes(name));
        _hashedVersion = keccak256(bytes(version));

        _cachedChainId = block.chainid;
        _cachedDomainSeparator = _buildDomainSeparator();
        _cachedThis = address(this);
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _cachedThis && block.chainid == _cachedChainId) {
            return _cachedDomainSeparator;
        } else {
            return _buildDomainSeparator();
        }
    }

    function _buildDomainSeparator() private view returns (bytes32) {
        return keccak256(abi.encode(_TYPE_HASH, _hashedName, _hashedVersion, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }

    /**
     * @dev See {EIP-5267}.
     *
     * _Available since v4.9._
     */
    function eip712Domain()
        public
        view
        virtual
        override
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        )
    {
        return (
            hex"0f", // 01111
            _name.toStringWithFallback(_nameFallback),
            _version.toStringWithFallback(_versionFallback),
            block.chainid,
            address(this),
            bytes32(0),
            new uint256[](0)
        );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { Ownable2Step } from "@openzeppelin/contracts/access/Ownable2Step.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

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

/**
 * @title GuardianOwnable
 * @author Fun.xyz
 */
abstract contract GuardianOwnable is Ownable2Step, GuardianRescuable {
    error RenounceDisabled();

    function guardian() public view override returns (address) {
        return owner();
    }

    function renounceOwnership() public view override onlyOwner {
        revert RenounceDisabled();
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @title GuardianRescuable
 * @author Fun.xyz
 */
abstract contract GuardianRescuable {
    using SafeERC20 for IERC20;

    error NotGuardian(address sender);

    modifier onlyGuardian() {
        if (msg.sender != guardian()) {
            revert NotGuardian(msg.sender);
        }
        _;
    }

    function guardian() public virtual returns (address);

    function withdrawNative(
        address payable recipient,
        uint256 amount
    ) external onlyGuardian {
        recipient.transfer(amount);
    }

    function withdrawErc20(
        IERC20 token,
        address recipient,
        uint256 amount
    ) external onlyGuardian {
        token.safeTransfer(recipient, amount);
    }

    function withdrawAllNative(
        address payable recipient
    ) external onlyGuardian {
        recipient.transfer(address(this).balance);
    }

    function withdrawAllErc20(
        IERC20 token,
        address recipient
    ) external onlyGuardian {
        uint256 balance = token.balanceOf(address(this));
        token.safeTransfer(recipient, balance);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable no-inline-assembly */

/**
 * returned data from validateUserOp.
 * validateUserOp returns a uint256, with is created by `_packedValidationData` and parsed by `_parseValidationData`
 * @param aggregator - address(0) - the account validated the signature by itself.
 *              address(1) - the account failed to validate the signature.
 *              otherwise - this is an address of a signature aggregator that must be used to validate the signature.
 * @param validAfter - this UserOp is valid only after this timestamp.
 * @param validaUntil - this UserOp is valid only up to this timestamp.
 */
    struct ValidationData {
        address aggregator;
        uint48 validAfter;
        uint48 validUntil;
    }

//extract sigFailed, validAfter, validUntil.
// also convert zero validUntil to type(uint48).max
    function _parseValidationData(uint validationData) pure returns (ValidationData memory data) {
        address aggregator = address(uint160(validationData));
        uint48 validUntil = uint48(validationData >> 160);
        if (validUntil == 0) {
            validUntil = type(uint48).max;
        }
        uint48 validAfter = uint48(validationData >> (48 + 160));
        return ValidationData(aggregator, validAfter, validUntil);
    }

// intersect account and paymaster ranges.
    function _intersectTimeRange(uint256 validationData, uint256 paymasterValidationData) pure returns (ValidationData memory) {
        ValidationData memory accountValidationData = _parseValidationData(validationData);
        ValidationData memory pmValidationData = _parseValidationData(paymasterValidationData);
        address aggregator = accountValidationData.aggregator;
        if (aggregator == address(0)) {
            aggregator = pmValidationData.aggregator;
        }
        uint48 validAfter = accountValidationData.validAfter;
        uint48 validUntil = accountValidationData.validUntil;
        uint48 pmValidAfter = pmValidationData.validAfter;
        uint48 pmValidUntil = pmValidationData.validUntil;

        if (validAfter < pmValidAfter) validAfter = pmValidAfter;
        if (validUntil > pmValidUntil) validUntil = pmValidUntil;
        return ValidationData(aggregator, validAfter, validUntil);
    }

/**
 * helper to pack the return value for validateUserOp
 * @param data - the ValidationData to pack
 */
    function _packValidationData(ValidationData memory data) pure returns (uint256) {
        return uint160(data.aggregator) | (uint256(data.validUntil) << 160) | (uint256(data.validAfter) << (160 + 48));
    }

/**
 * helper to pack the return value for validateUserOp, when not using an aggregator
 * @param sigFailed - true for signature failure, false for success
 * @param validUntil last timestamp this UserOperation is valid (or zero for infinite)
 * @param validAfter first timestamp this UserOperation is valid
 */
    function _packValidationData(bool sigFailed, uint48 validUntil, uint48 validAfter) pure returns (uint256) {
        return (sigFailed ? 1 : 0) | (uint256(validUntil) << 160) | (uint256(validAfter) << (160 + 48));
    }

/**
 * keccak function over calldata.
 * @dev copy calldata into memory, do keccak and drop allocated memory. Strangely, this is more efficient than letting solidity do it.
 */
    function calldataKeccak(bytes calldata data) pure returns (bytes32 ret) {
        assembly {
            let mem := mload(0x40)
            let len := data.length
            calldatacopy(mem, data.offset, len)
            ret := keccak256(mem, len)
        }
    }

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

import "./UserOperation.sol";

interface IAccount {

    /**
     * Validate user's signature and nonce
     * the entryPoint will make the call to the recipient only if this validation call returns successfully.
     * signature failure should be reported by returning SIG_VALIDATION_FAILED (1).
     * This allows making a "simulation call" without a valid signature
     * Other failures (e.g. nonce mismatch, or invalid signature format) should still revert to signal failure.
     *
     * @dev Must validate caller is the entryPoint.
     *      Must validate the signature and nonce
     * @param userOp the operation that is about to be executed.
     * @param userOpHash hash of the user's request data. can be used as the basis for signature.
     * @param missingAccountFunds missing funds on the account's deposit in the entrypoint.
     *      This is the minimum amount to transfer to the sender(entryPoint) to be able to make the call.
     *      The excess is left as a deposit in the entrypoint, for future calls.
     *      can be withdrawn anytime using "entryPoint.withdrawTo()"
     *      In case there is a paymaster in the request (or the current deposit is high enough), this value will be zero.
     * @return validationData packaged ValidationData structure. use `_packValidationData` and `_unpackValidationData` to encode and decode
     *      <20-byte> sigAuthorizer - 0 for valid signature, 1 to mark signature failure,
     *         otherwise, an address of an "authorizer" contract.
     *      <6-byte> validUntil - last timestamp this operation is valid. 0 for "indefinite"
     *      <6-byte> validAfter - first timestamp this operation is valid
     *      If an account doesn't use time-range, it is enough to return SIG_VALIDATION_FAILED value (1) for signature failure.
     *      Note that the validation code cannot use block.timestamp (or block.number) directly.
     */
    function validateUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 missingAccountFunds)
    external returns (uint256 validationData);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

import "./UserOperation.sol";

/**
 * Aggregated Signatures validator.
 */
interface IAggregator {

    /**
     * validate aggregated signature.
     * revert if the aggregated signature does not match the given list of operations.
     */
    function validateSignatures(UserOperation[] calldata userOps, bytes calldata signature) external view;

    /**
     * validate signature of a single userOp
     * This method is should be called by bundler after EntryPoint.simulateValidation() returns (reverts) with ValidationResultWithAggregation
     * First it validates the signature over the userOp. Then it returns data to be used when creating the handleOps.
     * @param userOp the userOperation received from the user.
     * @return sigForUserOp the value to put into the signature field of the userOp when calling handleOps.
     *    (usually empty, unless account and aggregator support some kind of "multisig"
     */
    function validateUserOpSignature(UserOperation calldata userOp)
    external view returns (bytes memory sigForUserOp);

    /**
     * aggregate multiple signatures into a single value.
     * This method is called off-chain to calculate the signature to pass with handleOps()
     * bundler MAY use optimized custom code perform this aggregation
     * @param userOps array of UserOperations to collect the signatures from.
     * @return aggregatedSignature the aggregated signature
     */
    function aggregateSignatures(UserOperation[] calldata userOps) external view returns (bytes memory aggregatedSignature);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// 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
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC5267.sol)

pragma solidity ^0.8.0;

interface IERC5267 {
    /**
     * @dev MAY be emitted to signal that the domain could have changed.
     */
    event EIP712DomainChanged();

    /**
     * @dev returns the fields and values that describe the domain separator used by this contract for EIP-712
     * signature.
     */
    function eip712Domain()
        external
        view
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        );
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC777/IERC777Recipient.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP.
 *
 * Accounts can be notified of {IERC777} tokens being sent to them by having a
 * contract implement this interface (contract holders can be their own
 * implementer) and registering it on the
 * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry].
 *
 * See {IERC1820Registry} and {ERC1820Implementer}.
 */
interface IERC777Recipient {
    /**
     * @dev Called by an {IERC777} token contract whenever tokens are being
     * moved or created into a registered account (`to`). The type of operation
     * is conveyed by `from` being the zero address or not.
     *
     * This call occurs _after_ the token contract's state is updated, so
     * {IERC777-balanceOf}, etc., can be used to query the post-operation state.
     *
     * This function may revert to prevent the operation from being executed.
     */
    function tokensReceived(
        address operator,
        address from,
        address to,
        uint256 amount,
        bytes calldata userData,
        bytes calldata operatorData
    ) external;
}

/**
 ** Account-Abstraction (EIP-4337) singleton EntryPoint implementation.
 ** Only one instance required on each chain.
 **/
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable avoid-low-level-calls */
/* solhint-disable no-inline-assembly */
/* solhint-disable reason-string */

import "./UserOperation.sol";
import "./IStakeManager.sol";
import "./IAggregator.sol";
import "./INonceManager.sol";

interface IEntryPoint is IStakeManager, INonceManager {

    /***
     * An event emitted after each successful request
     * @param userOpHash - unique identifier for the request (hash its entire content, except signature).
     * @param sender - the account that generates this request.
     * @param paymaster - if non-null, the paymaster that pays for this request.
     * @param nonce - the nonce value from the request.
     * @param success - true if the sender transaction succeeded, false if reverted.
     * @param actualGasCost - actual amount paid (by account or paymaster) for this UserOperation.
     * @param actualGasUsed - total gas used by this UserOperation (including preVerification, creation, validation and execution).
     */
    event UserOperationEvent(bytes32 indexed userOpHash, address indexed sender, address indexed paymaster, uint256 nonce, bool success, uint256 actualGasCost, uint256 actualGasUsed);

    /**
     * account "sender" was deployed.
     * @param userOpHash the userOp that deployed this account. UserOperationEvent will follow.
     * @param sender the account that is deployed
     * @param factory the factory used to deploy this account (in the initCode)
     * @param paymaster the paymaster used by this UserOp
     */
    event AccountDeployed(bytes32 indexed userOpHash, address indexed sender, address factory, address paymaster);

    /**
     * An event emitted if the UserOperation "callData" reverted with non-zero length
     * @param userOpHash the request unique identifier.
     * @param sender the sender of this request
     * @param nonce the nonce used in the request
     * @param revertReason - the return bytes from the (reverted) call to "callData".
     */
    event UserOperationRevertReason(bytes32 indexed userOpHash, address indexed sender, uint256 nonce, bytes revertReason);

    /**
     * an event emitted by handleOps(), before starting the execution loop.
     * any event emitted before this event, is part of the validation.
     */
    event BeforeExecution();

    /**
     * signature aggregator used by the following UserOperationEvents within this bundle.
     */
    event SignatureAggregatorChanged(address indexed aggregator);

    /**
     * a custom revert error of handleOps, to identify the offending op.
     *  NOTE: if simulateValidation passes successfully, there should be no reason for handleOps to fail on it.
     *  @param opIndex - index into the array of ops to the failed one (in simulateValidation, this is always zero)
     *  @param reason - revert reason
     *      The string starts with a unique code "AAmn", where "m" is "1" for factory, "2" for account and "3" for paymaster issues,
     *      so a failure can be attributed to the correct entity.
     *   Should be caught in off-chain handleOps simulation and not happen on-chain.
     *   Useful for mitigating DoS attempts against batchers or for troubleshooting of factory/account/paymaster reverts.
     */
    error FailedOp(uint256 opIndex, string reason);

    /**
     * error case when a signature aggregator fails to verify the aggregated signature it had created.
     */
    error SignatureValidationFailed(address aggregator);

    /**
     * Successful result from simulateValidation.
     * @param returnInfo gas and time-range returned values
     * @param senderInfo stake information about the sender
     * @param factoryInfo stake information about the factory (if any)
     * @param paymasterInfo stake information about the paymaster (if any)
     */
    error ValidationResult(ReturnInfo returnInfo,
        StakeInfo senderInfo, StakeInfo factoryInfo, StakeInfo paymasterInfo);

    /**
     * Successful result from simulateValidation, if the account returns a signature aggregator
     * @param returnInfo gas and time-range returned values
     * @param senderInfo stake information about the sender
     * @param factoryInfo stake information about the factory (if any)
     * @param paymasterInfo stake information about the paymaster (if any)
     * @param aggregatorInfo signature aggregation info (if the account requires signature aggregator)
     *      bundler MUST use it to verify the signature, or reject the UserOperation
     */
    error ValidationResultWithAggregation(ReturnInfo returnInfo,
        StakeInfo senderInfo, StakeInfo factoryInfo, StakeInfo paymasterInfo,
        AggregatorStakeInfo aggregatorInfo);

    /**
     * return value of getSenderAddress
     */
    error SenderAddressResult(address sender);

    /**
     * return value of simulateHandleOp
     */
    error ExecutionResult(uint256 preOpGas, uint256 paid, uint48 validAfter, uint48 validUntil, bool targetSuccess, bytes targetResult);

    //UserOps handled, per aggregator
    struct UserOpsPerAggregator {
        UserOperation[] userOps;

        // aggregator address
        IAggregator aggregator;
        // aggregated signature
        bytes signature;
    }

    /**
     * Execute a batch of UserOperation.
     * no signature aggregator is used.
     * if any account requires an aggregator (that is, it returned an aggregator when
     * performing simulateValidation), then handleAggregatedOps() must be used instead.
     * @param ops the operations to execute
     * @param beneficiary the address to receive the fees
     */
    function handleOps(UserOperation[] calldata ops, address payable beneficiary) external;

    /**
     * Execute a batch of UserOperation with Aggregators
     * @param opsPerAggregator the operations to execute, grouped by aggregator (or address(0) for no-aggregator accounts)
     * @param beneficiary the address to receive the fees
     */
    function handleAggregatedOps(
        UserOpsPerAggregator[] calldata opsPerAggregator,
        address payable beneficiary
    ) external;

    /**
     * generate a request Id - unique identifier for this request.
     * the request ID is a hash over the content of the userOp (except the signature), the entrypoint and the chainid.
     */
    function getUserOpHash(UserOperation calldata userOp) external view returns (bytes32);

    /**
     * Simulate a call to account.validateUserOp and paymaster.validatePaymasterUserOp.
     * @dev this method always revert. Successful result is ValidationResult error. other errors are failures.
     * @dev The node must also verify it doesn't use banned opcodes, and that it doesn't reference storage outside the account's data.
     * @param userOp the user operation to validate.
     */
    function simulateValidation(UserOperation calldata userOp) external;

    /**
     * gas and return values during simulation
     * @param preOpGas the gas used for validation (including preValidationGas)
     * @param prefund the required prefund for this operation
     * @param sigFailed validateUserOp's (or paymaster's) signature check failed
     * @param validAfter - first timestamp this UserOp is valid (merging account and paymaster time-range)
     * @param validUntil - last timestamp this UserOp is valid (merging account and paymaster time-range)
     * @param paymasterContext returned by validatePaymasterUserOp (to be passed into postOp)
     */
    struct ReturnInfo {
        uint256 preOpGas;
        uint256 prefund;
        bool sigFailed;
        uint48 validAfter;
        uint48 validUntil;
        bytes paymasterContext;
    }

    /**
     * returned aggregated signature info.
     * the aggregator returned by the account, and its current stake.
     */
    struct AggregatorStakeInfo {
        address aggregator;
        StakeInfo stakeInfo;
    }

    /**
     * Get counterfactual sender address.
     *  Calculate the sender contract address that will be generated by the initCode and salt in the UserOperation.
     * this method always revert, and returns the address in SenderAddressResult error
     * @param initCode the constructor code to be passed into the UserOperation.
     */
    function getSenderAddress(bytes memory initCode) external;


    /**
     * simulate full execution of a UserOperation (including both validation and target execution)
     * this method will always revert with "ExecutionResult".
     * it performs full validation of the UserOperation, but ignores signature error.
     * an optional target address is called after the userop succeeds, and its value is returned
     * (before the entire call is reverted)
     * Note that in order to collect the the success/failure of the target call, it must be executed
     * with trace enabled to track the emitted events.
     * @param op the UserOperation to simulate
     * @param target if nonzero, a target address to call after userop simulation. If called, the targetSuccess and targetResult
     *        are set to the return from that call.
     * @param targetCallData callData to pass to target address
     */
    function simulateHandleOp(UserOperation calldata op, address target, bytes calldata targetCallData) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

interface INonceManager {

    /**
     * Return the next nonce for this sender.
     * Within a given key, the nonce values are sequenced (starting with zero, and incremented by one on each userop)
     * But UserOp with different keys can come with arbitrary order.
     *
     * @param sender the account address
     * @param key the high 192 bit of the nonce
     * @return nonce a full nonce to pass for next UserOp with this sender.
     */
    function getNonce(address sender, uint192 key)
    external view returns (uint256 nonce);

    /**
     * Manually increment the nonce of the sender.
     * This method is exposed just for completeness..
     * Account does NOT need to call it, neither during validation, nor elsewhere,
     * as the EntryPoint will update the nonce regardless.
     * Possible use-case is call it with various keys to "initialize" their nonces to one, so that future
     * UserOperations will not pay extra for the first transaction with a given key.
     */
    function incrementNonce(uint192 key) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

import "./UserOperation.sol";

/**
 * the interface exposed by a paymaster contract, who agrees to pay the gas for user's operations.
 * a paymaster must hold a stake to cover the required entrypoint stake and also the gas for the transaction.
 */
interface IPaymaster {

    enum PostOpMode {
        opSucceeded, // user op succeeded
        opReverted, // user op reverted. still has to pay for gas.
        postOpReverted //user op succeeded, but caused postOp to revert. Now it's a 2nd call, after user's op was deliberately reverted.
    }

    /**
     * payment validation: check if paymaster agrees to pay.
     * Must verify sender is the entryPoint.
     * Revert to reject this request.
     * Note that bundlers will reject this method if it changes the state, unless the paymaster is trusted (whitelisted)
     * The paymaster pre-pays using its deposit, and receive back a refund after the postOp method returns.
     * @param userOp the user operation
     * @param userOpHash hash of the user's request data.
     * @param maxCost the maximum cost of this transaction (based on maximum gas and gas price from userOp)
     * @return context value to send to a postOp
     *      zero length to signify postOp is not required.
     * @return validationData signature and time-range of this operation, encoded the same as the return value of validateUserOperation
     *      <20-byte> sigAuthorizer - 0 for valid signature, 1 to mark signature failure,
     *         otherwise, an address of an "authorizer" contract.
     *      <6-byte> validUntil - last timestamp this operation is valid. 0 for "indefinite"
     *      <6-byte> validAfter - first timestamp this operation is valid
     *      Note that the validation code cannot use block.timestamp (or block.number) directly.
     */
    function validatePaymasterUserOp(UserOperation calldata userOp, bytes32 userOpHash, uint256 maxCost)
    external returns (bytes memory context, uint256 validationData);

    /**
     * post-operation handler.
     * Must verify sender is the entryPoint
     * @param mode enum with the following options:
     *      opSucceeded - user operation succeeded.
     *      opReverted  - user op reverted. still has to pay for gas.
     *      postOpReverted - user op succeeded, but caused postOp (in mode=opSucceeded) to revert.
     *                       Now this is the 2nd call, after user's op was deliberately reverted.
     * @param context - the context value returned by validatePaymasterUserOp
     * @param actualGasCost - actual gas used so far (without this postOp call).
     */
    function postOp(PostOpMode mode, bytes calldata context, uint256 actualGasCost) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.12;

/**
 * manage deposits and stakes.
 * deposit is just a balance used to pay for UserOperations (either by a paymaster or an account)
 * stake is value locked for at least "unstakeDelay" by the staked entity.
 */
interface IStakeManager {

    event Deposited(
        address indexed account,
        uint256 totalDeposit
    );

    event Withdrawn(
        address indexed account,
        address withdrawAddress,
        uint256 amount
    );

    /// Emitted when stake or unstake delay are modified
    event StakeLocked(
        address indexed account,
        uint256 totalStaked,
        uint256 unstakeDelaySec
    );

    /// Emitted once a stake is scheduled for withdrawal
    event StakeUnlocked(
        address indexed account,
        uint256 withdrawTime
    );

    event StakeWithdrawn(
        address indexed account,
        address withdrawAddress,
        uint256 amount
    );

    /**
     * @param deposit the entity's deposit
     * @param staked true if this entity is staked.
     * @param stake actual amount of ether staked for this entity.
     * @param unstakeDelaySec minimum delay to withdraw the stake.
     * @param withdrawTime - first block timestamp where 'withdrawStake' will be callable, or zero if already locked
     * @dev sizes were chosen so that (deposit,staked, stake) fit into one cell (used during handleOps)
     *    and the rest fit into a 2nd cell.
     *    112 bit allows for 10^15 eth
     *    48 bit for full timestamp
     *    32 bit allows 150 years for unstake delay
     */
    struct DepositInfo {
        uint112 deposit;
        bool staked;
        uint112 stake;
        uint32 unstakeDelaySec;
        uint48 withdrawTime;
    }

    //API struct used by getStakeInfo and simulateValidation
    struct StakeInfo {
        uint256 stake;
        uint256 unstakeDelaySec;
    }

    /// @return info - full deposit information of given account
    function getDepositInfo(address account) external view returns (DepositInfo memory info);

    /// @return the deposit (for gas payment) of the account
    function balanceOf(address account) external view returns (uint256);

    /**
     * add to the deposit of the given account
     */
    function depositTo(address account) external payable;

    /**
     * add to the account's stake - amount and delay
     * any pending unstake is first cancelled.
     * @param _unstakeDelaySec the new lock duration before the deposit can be withdrawn.
     */
    function addStake(uint32 _unstakeDelaySec) external payable;

    /**
     * attempt to unlock the stake.
     * the value can be withdrawn (using withdrawStake) after the unstake delay.
     */
    function unlockStake() external;

    /**
     * withdraw from the (unlocked) stake.
     * must first call unlockStake and wait for the unstakeDelay to pass
     * @param withdrawAddress the address to send withdrawn value.
     */
    function withdrawStake(address payable withdrawAddress) external;

    /**
     * withdraw from the deposit.
     * @param withdrawAddress the address to send withdrawn value.
     * @param withdrawAmount the amount to withdraw.
     */
    function withdrawTo(address payable withdrawAddress, uint256 withdrawAmount) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {
    IPaymaster
} from "@account-abstraction/contracts/interfaces/IPaymaster.sol";

interface InspectablePaymasterInterface {
    function getLastOpMode() external view returns (IPaymaster.PostOpMode);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/ShortStrings.sol)

pragma solidity ^0.8.8;

import "./StorageSlot.sol";

// | string  | 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA   |
// | length  | 0x                                                              BB |
type ShortString is bytes32;

/**
 * @dev This library provides functions to convert short memory strings
 * into a `ShortString` type that can be used as an immutable variable.
 *
 * Strings of arbitrary length can be optimized using this library if
 * they are short enough (up to 31 bytes) by packing them with their
 * length (1 byte) in a single EVM word (32 bytes). Additionally, a
 * fallback mechanism can be used for every other case.
 *
 * Usage example:
 *
 * ```solidity
 * contract Named {
 *     using ShortStrings for *;
 *
 *     ShortString private immutable _name;
 *     string private _nameFallback;
 *
 *     constructor(string memory contractName) {
 *         _name = contractName.toShortStringWithFallback(_nameFallback);
 *     }
 *
 *     function name() external view returns (string memory) {
 *         return _name.toStringWithFallback(_nameFallback);
 *     }
 * }
 * ```
 */
library ShortStrings {
    // Used as an identifier for strings longer than 31 bytes.
    bytes32 private constant _FALLBACK_SENTINEL = 0x00000000000000000000000000000000000000000000000000000000000000FF;

    error StringTooLong(string str);
    error InvalidShortString();

    /**
     * @dev Encode a string of at most 31 chars into a `ShortString`.
     *
     * This will trigger a `StringTooLong` error is the input string is too long.
     */
    function toShortString(string memory str) internal pure returns (ShortString) {
        bytes memory bstr = bytes(str);
        if (bstr.length > 31) {
            revert StringTooLong(str);
        }
        return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length));
    }

    /**
     * @dev Decode a `ShortString` back to a "normal" string.
     */
    function toString(ShortString sstr) internal pure returns (string memory) {
        uint256 len = byteLength(sstr);
        // using `new string(len)` would work locally but is not memory safe.
        string memory str = new string(32);
        /// @solidity memory-safe-assembly
        assembly {
            mstore(str, len)
            mstore(add(str, 0x20), sstr)
        }
        return str;
    }

    /**
     * @dev Return the length of a `ShortString`.
     */
    function byteLength(ShortString sstr) internal pure returns (uint256) {
        uint256 result = uint256(ShortString.unwrap(sstr)) & 0xFF;
        if (result > 31) {
            revert InvalidShortString();
        }
        return result;
    }

    /**
     * @dev Encode a string into a `ShortString`, or write it to storage if it is too long.
     */
    function toShortStringWithFallback(string memory value, string storage store) internal returns (ShortString) {
        if (bytes(value).length < 32) {
            return toShortString(value);
        } else {
            StorageSlot.getStringSlot(store).value = value;
            return ShortString.wrap(_FALLBACK_SENTINEL);
        }
    }

    /**
     * @dev Decode a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
     */
    function toStringWithFallback(ShortString value, string storage store) internal pure returns (string memory) {
        if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
            return toString(value);
        } else {
            return store;
        }
    }

    /**
     * @dev Return the length of a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
     *
     * WARNING: This will return the "byte length" of the string. This may not reflect the actual length in terms of
     * actual characters as the UTF-8 encoding of a single character can span over multiple bytes.
     */
    function byteLengthWithFallback(ShortString value, string storage store) internal view returns (uint256) {
        if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
            return byteLength(value);
        } else {
            return bytes(store).length;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;

/* solhint-disable avoid-low-level-calls */
/* solhint-disable no-inline-assembly */
/* solhint-disable reason-string */

import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol";

import "../core/BaseAccount.sol";
import "./callback/TokenCallbackHandler.sol";

/**
  * minimal account.
  *  this is sample minimal account.
  *  has execute, eth handling methods
  *  has a single signer that can send requests through the entryPoint.
  */
contract SimpleAccount is BaseAccount, TokenCallbackHandler, UUPSUpgradeable, Initializable {
    using ECDSA for bytes32;

    address public owner;

    IEntryPoint private immutable _entryPoint;

    event SimpleAccountInitialized(IEntryPoint indexed entryPoint, address indexed owner);

    modifier onlyOwner() {
        _onlyOwner();
        _;
    }

    /// @inheritdoc BaseAccount
    function entryPoint() public view virtual override returns (IEntryPoint) {
        return _entryPoint;
    }


    // solhint-disable-next-line no-empty-blocks
    receive() external payable {}

    constructor(IEntryPoint anEntryPoint) {
        _entryPoint = anEntryPoint;
        _disableInitializers();
    }

    function _onlyOwner() internal view {
        //directly from EOA owner, or through the account itself (which gets redirected through execute())
        require(msg.sender == owner || msg.sender == address(this), "only owner");
    }

    /**
     * execute a transaction (called directly from owner, or by entryPoint)
     */
    function execute(address dest, uint256 value, bytes calldata func) external {
        _requireFromEntryPointOrOwner();
        _call(dest, value, func);
    }

    /**
     * execute a sequence of transactions
     */
    function executeBatch(address[] calldata dest, bytes[] calldata func) external {
        _requireFromEntryPointOrOwner();
        require(dest.length == func.length, "wrong array lengths");
        for (uint256 i = 0; i < dest.length; i++) {
            _call(dest[i], 0, func[i]);
        }
    }

    /**
     * @dev The _entryPoint member is immutable, to reduce gas consumption.  To upgrade EntryPoint,
     * a new implementation of SimpleAccount must be deployed with the new EntryPoint address, then upgrading
      * the implementation by calling `upgradeTo()`
     */
    function initialize(address anOwner) public virtual initializer {
        _initialize(anOwner);
    }

    function _initialize(address anOwner) internal virtual {
        owner = anOwner;
        emit SimpleAccountInitialized(_entryPoint, owner);
    }

    // Require the function call went through EntryPoint or owner
    function _requireFromEntryPointOrOwner() internal view {
        require(msg.sender == address(entryPoint()) || msg.sender == owner, "account: not Owner or EntryPoint");
    }

    /// implement template method of BaseAccount
    function _validateSignature(UserOperation calldata userOp, bytes32 userOpHash)
    internal override virtual returns (uint256 validationData) {
        bytes32 hash = userOpHash.toEthSignedMessageHash();
        if (owner != hash.recover(userOp.signature))
            return SIG_VALIDATION_FAILED;
        return 0;
    }

    function _call(address target, uint256 value, bytes memory data) internal {
        (bool success, bytes memory result) = target.call{value : value}(data);
        if (!success) {
            assembly {
                revert(add(result, 32), mload(result))
            }
        }
    }

    /**
     * check current account deposit in the entryPoint
     */
    function getDeposit() public view returns (uint256) {
        return entryPoint().balanceOf(address(this));
    }

    /**
     * deposit more funds for this account in the entryPoint
     */
    function addDeposit() public payable {
        entryPoint().depositTo{value : msg.value}(address(this));
    }

    /**
     * withdraw value from the account's deposit
     * @param withdrawAddress target to send to
     * @param amount to withdraw
     */
    function withdrawDepositTo(address payable withdrawAddress, uint256 amount) public onlyOwner {
        entryPoint().withdrawTo(withdrawAddress, amount);
    }

    function _authorizeUpgrade(address newImplementation) internal view override {
        (newImplementation);
        _onlyOwner();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}