Contract 0x36225733276425f5dba88977aef45f042bacb953 6

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

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have 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.
 *
 * 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 initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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
    }

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

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

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

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import {ForwardRequest} from "./structs/RequestTypes.sol";
import {GelatoRelayForwarderBase} from "./base/GelatoRelayForwarderBase.sol";
import {GelatoCallUtils} from "./gelato/GelatoCallUtils.sol";
import {GelatoTokenUtils} from "./gelato/GelatoTokenUtils.sol";
import {Proxied} from "./vendor/hardhat-deploy/Proxied.sol";
import {
    Initializable
} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

/// @title Gelato Relay Forwarder contract
/// @notice This contract must NEVER hold funds!
/// @dev    Maliciously crafted transaction payloads could wipe out any funds left here.
// solhint-disable-next-line max-states-count
contract GelatoRelayForwarder is
    Proxied,
    Initializable,
    GelatoRelayForwarderBase
{
    address public immutable gelato;
    uint256 public immutable chainId;

    mapping(address => uint256) public nonce;
    mapping(bytes32 => bool) public messageDelivered;
    address public gasTank;
    address public gasTankAdmin;

    event LogForwardCallSyncFee(
        address indexed target,
        address feeToken,
        uint256 fee,
        bytes32 taskId
    );

    event LogForwardRequestAsyncGasTankFee(
        address indexed sponsor,
        address indexed target,
        uint256 sponsorChainId,
        address feeToken,
        uint256 fee,
        bytes32 taskId
    );

    event LogForwardRequestSyncGasTankFee(
        address indexed sponsor,
        address indexed target,
        address feeToken,
        uint256 fee,
        bytes32 taskId
    );

    event LogSetGasTank(address oldGasTank, address newGasTank);

    event LogSetGasTankAdmin(address oldGasTankAdmin, address newGasTankAdmin);

    event LogUseGelato1Balance(
        address indexed sponsor,
        address indexed service,
        address indexed feeToken,
        uint256 sponsorChainId,
        uint256 nativeToFeeTokenXRateNumerator,
        uint256 nativeToFeeTokenXRateDenominator
    );

    modifier onlyGelato() {
        require(msg.sender == gelato, "Only callable by gelato");
        _;
    }

    modifier onlyGasTankAdmin() {
        require(msg.sender == gasTankAdmin, "Only callable by gasTankAdmin");
        _;
    }

    constructor(address _gelato) {
        gelato = _gelato;

        uint256 _chainId;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            _chainId := chainid()
        }

        chainId = _chainId;
    }

    function init(address _gasTankAdmin) external initializer {
        gasTankAdmin = _gasTankAdmin;

        emit LogSetGasTankAdmin(address(0), _gasTankAdmin);
    }

    function setGasTank(address _gasTank) external onlyGasTankAdmin {
        require(_gasTank != address(0), "Invalid gasTank address");

        emit LogSetGasTank(gasTank, _gasTank);

        gasTank = _gasTank;
    }

    function setGasTankAdmin(address _gasTankAdmin) external onlyGasTankAdmin {
        require(_gasTankAdmin != address(0), "Invalid gasTankAdmin address");

        emit LogSetGasTankAdmin(gasTankAdmin, _gasTankAdmin);

        gasTankAdmin = _gasTankAdmin;
    }

    function forwardCallSyncFee(
        address _target,
        bytes calldata _data,
        address _feeToken,
        uint256 _gas,
        uint256 _gelatoFee,
        bytes32 _taskId
    ) external onlyGelato {
        uint256 preBalance = GelatoTokenUtils.getBalance(
            _feeToken,
            address(this)
        );
        require(_target != gasTank, "target address cannot be gasTank");
        GelatoCallUtils.safeExternalCall(_target, _data, _gas);
        uint256 postBalance = GelatoTokenUtils.getBalance(
            _feeToken,
            address(this)
        );

        uint256 amount = postBalance - preBalance;
        require(amount >= _gelatoFee, "Insufficient fee");
        // TODO: change fee collector
        GelatoTokenUtils.transferToGelato(gelato, _feeToken, amount);

        emit LogForwardCallSyncFee(_target, _feeToken, amount, _taskId);
    }

    // solhint-disable-next-line function-max-lines
    function forwardRequestGasTankFee(
        ForwardRequest calldata _req,
        bytes calldata _sponsorSignature,
        uint256 _gelatoFee,
        uint256 _nativeToFeeTokenXRateNumerator,
        uint256 _nativeToFeeTokenXRateDenominator,
        bytes32 _taskId
    ) external onlyGelato {
        require(_req.chainId == chainId, "Wrong chainId");

        require(
            _req.paymentType == 1 || _req.paymentType == 2,
            "paymentType must be 1 or 2"
        );

        require(_gelatoFee <= _req.maxFee, "Gelato executor over-charged");

        // Verify and increment sponsor's nonce
        // We assume that all security is enforced on _req.target address,
        // hence we allow the sponsor to submit multiple transactions concurrently
        // In case one reverts, it won't stop the following ones from being executed

        // Optionally, the dApp may not want to track smart contract nonces
        // We allow this option, BUT MAKE SURE _req.target IMPLEMENTS STRONG REPLAY PROTECTION!!
        if (_req.enforceSponsorNonce) {
            if (_req.enforceSponsorNonceOrdering) {
                // Enforce ordering on nonces,
                // If tx with nonce n reverts, so will txs with nonce n+1.
                require(_req.nonce == nonce[_req.sponsor], "Invalid nonce");
                nonce[_req.sponsor] = _req.nonce + 1;

                _verifyForwardRequestSignature(
                    _req,
                    _sponsorSignature,
                    _req.sponsor
                );
            } else {
                // Do not enforce ordering on nonces,
                // but still enforce replay protection
                // via uniqueness of message
                bytes32 message = _verifyForwardRequestSignature(
                    _req,
                    _sponsorSignature,
                    _req.sponsor
                );

                require(!messageDelivered[message], "Task already executed");
                messageDelivered[message] = true;
            }
        } else {
            _verifyForwardRequestSignature(
                _req,
                _sponsorSignature,
                _req.sponsor
            );
        }

        require(_req.target != gasTank, "target address cannot be gasTank");
        GelatoCallUtils.safeExternalCall(_req.target, _req.data, _req.gas);

        if (_req.paymentType == 1) {
            // GasTank payment with asynchronous fee crediting
            emit LogForwardRequestAsyncGasTankFee(
                _req.sponsor,
                _req.target,
                _req.sponsorChainId == 0 ? chainId : _req.sponsorChainId,
                _req.feeToken,
                _gelatoFee,
                _taskId
            );

            emit LogUseGelato1Balance(
                _req.sponsor,
                address(this),
                _req.feeToken,
                chainId,
                _nativeToFeeTokenXRateNumerator,
                _nativeToFeeTokenXRateDenominator
            );
        } else {
            // TODO: deduct balance from GasTank
            // Credit GasTank fee
            emit LogForwardRequestSyncGasTankFee(
                _req.sponsor,
                _req.target,
                _req.feeToken,
                _gelatoFee,
                _taskId
            );
        }
    }

    function getDomainSeparator() public view returns (bytes32) {
        return _getDomainSeparator(chainId);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import {ForwardRequest} from "../structs/RequestTypes.sol";
import {ECDSA} from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

abstract contract GelatoRelayForwarderBase {
    bytes32 public constant FORWARD_REQUEST_TYPEHASH =
        keccak256(
            bytes(
                // solhint-disable-next-line max-line-length
                "ForwardRequest(uint256 chainId,address target,bytes data,address feeToken,uint256 paymentType,uint256 maxFee,uint256 gas,address sponsor,uint256 sponsorChainId,uint256 nonce,bool enforceSponsorNonce,bool enforceSponsorNonceOrdering)"
            )
        );
    // solhint-disable-next-line max-line-length
    string public constant EIP712_DOMAIN_TYPE =
        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)";

    function _getDomainSeparator(uint256 _chainId)
        internal
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    keccak256(bytes(EIP712_DOMAIN_TYPE)),
                    keccak256(bytes("GelatoRelayForwarder")),
                    keccak256(bytes("V1")),
                    bytes32(_chainId),
                    address(this)
                )
            );
    }

    function _verifyForwardRequestSignature(
        ForwardRequest calldata _req,
        bytes calldata _signature,
        address _expectedSigner
    ) internal view returns (bytes32) {
        bytes32 domainSeparator = _getDomainSeparator(_req.chainId);

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                keccak256(_abiEncodeForwardRequest(_req))
            )
        );

        (address recovered, ECDSA.RecoverError error) = ECDSA.tryRecover(
            digest,
            _signature
        );
        require(
            error == ECDSA.RecoverError.NoError && recovered == _expectedSigner,
            "Invalid signature"
        );

        return digest;
    }

    function _abiEncodeForwardRequest(ForwardRequest calldata _req)
        internal
        pure
        returns (bytes memory encodedReq)
    {
        encodedReq = abi.encode(
            FORWARD_REQUEST_TYPEHASH,
            _req.chainId,
            _req.target,
            keccak256(_req.data),
            _req.feeToken,
            _req.paymentType,
            _req.maxFee,
            _req.gas,
            _req.sponsor,
            _req.sponsorChainId,
            _req.nonce,
            _req.enforceSponsorNonce,
            _req.enforceSponsorNonceOrdering
        );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

address constant NATIVE_TOKEN = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

library GelatoCallUtils {
    function safeExternalCall(
        address _dest,
        bytes calldata _data,
        uint256 _gas
    ) internal {
        require(
            _dest.code.length > 0,
            "GelatoCallUtils.safeExternalCall: _dest cannot be EOA"
        );

        (bool success, ) = _dest.call{gas: _gas}(_data);
        require(
            success,
            "GelatoCallUtils.safeExternalCall: External call failed"
        );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

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

library GelatoTokenUtils {
    function transferToGelato(
        address _gelato,
        address _token,
        uint256 _amount
    ) internal {
        if (_amount == 0) return;

        if (_token == NATIVE_TOKEN) {
            (bool success, ) = _gelato.call{value: _amount}("");
            require(success, "transferGelato: Gelato ETH transfer failed");
        } else {
            SafeERC20.safeTransfer(IERC20(_token), _gelato, _amount);
        }
    }

    function getBalance(address token, address user)
        internal
        view
        returns (uint256)
    {
        return
            token == NATIVE_TOKEN
                ? user.balance
                : IERC20(token).balanceOf(user);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

// Relay request with built-in MetaTx support with signature verification on behalf of user
// In case a sponsor (other than user) wants to pay for the tx,
// we will also need to verify sponsor's signature
struct MetaTxRequest {
    uint256 chainId;
    address target;
    bytes data;
    address feeToken;
    uint256 paymentType;
    uint256 maxFee;
    uint256 gas;
    address user;
    address sponsor; // could be same as user
    uint256 sponsorChainId;
    uint256 nonce;
    uint256 deadline;
}

// Similar to MetaTxRequest, but no need to implement user-specific signature verification logic
// Only sponsor signature is verified in order to ensure integrity of fee payments
struct ForwardRequest {
    uint256 chainId;
    address target;
    bytes data;
    address feeToken;
    uint256 paymentType;
    uint256 maxFee;
    uint256 gas;
    address sponsor;
    uint256 sponsorChainId;
    uint256 nonce;
    bool enforceSponsorNonce;
    bool enforceSponsorNonceOrdering;
}

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

abstract contract Proxied {
    // solhint-disable-next-line max-line-length
    /// @notice to be used by initialisation / postUpgrade function so that only the proxy's admin can execute them
    /// It also allows these functions to be called inside a contructor
    /// even if the contract is meant to be used without proxy
    modifier proxied() {
        address proxyAdminAddress = _proxyAdmin();
        // With hardhat-deploy proxies
        // the proxyAdminAddress is zero only for the implementation contract
        // if the implementation contract want to be used as a standalone/immutable contract
        // it simply has to execute the `proxied` function
        // This ensure the proxyAdminAddress is never zero post deployment
        // And allow you to keep the same code for both proxied contract and immutable contract
        if (proxyAdminAddress == address(0)) {
            // ensure can not be called twice when used outside of proxy : no admin
            // solhint-disable-next-line security/no-inline-assembly
            assembly {
                sstore(
                    0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103,
                    0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
                )
            }
        } else {
            require(msg.sender == proxyAdminAddress);
        }
        _;
    }

    modifier onlyProxyAdmin() {
        require(msg.sender == _proxyAdmin(), "NOT_AUTHORIZED");
        _;
    }

    function _proxyAdmin() internal view returns (address ownerAddress) {
        // solhint-disable-next-line security/no-inline-assembly
        assembly {
            ownerAddress := sload(
                0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103
            )
        }
    }
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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ForwardRequest","name":"_req","type":"tuple"},{"internalType":"bytes","name":"_sponsorSignature","type":"bytes"},{"internalType":"uint256","name":"_gelatoFee","type":"uint256"},{"internalType":"uint256","name":"_nativeToFeeTokenXRateNumerator","type":"uint256"},{"internalType":"uint256","name":"_nativeToFeeTokenXRateDenominator","type":"uint256"},{"internalType":"bytes32","name":"_taskId","type":"bytes32"}],"name":"forwardRequestGasTankFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"gasTank","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gasTankAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gelato","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDomainSeparator","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_gasTankAdmin","type":"address"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"messageDelivered","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_gasTank","type":"address"}],"name":"setGasTank","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_gasTankAdmin","type":"address"}],"name":"setGasTankAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000091f2a140ca47ddf438b9c583b7e71987525019bb

-----Decoded View---------------
Arg [0] : _gelato (address): 0x91f2a140ca47ddf438b9c583b7e71987525019bb

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000091f2a140ca47ddf438b9c583b7e71987525019bb