Contract

pragma solidity ^0.8.0;
pragma abicoder v2;

// solhint-disable not-rely-on-time
// SPDX-License-Identifier: GPL-3.0-only

import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

import "./IForwarder.sol";

/**
 * @title The Forwarder Implementation
 * @notice This implementation of the `IForwarder` interface uses ERC-712 signatures and stored nonces for verification.
 */
contract Forwarder is IForwarder, ERC165 {
    using ECDSA for bytes32;

    address private constant DRY_RUN_ADDRESS = 0x0000000000000000000000000000000000000000;

    string public constant GENERIC_PARAMS = "address from,address to,uint256 value,uint256 gas,uint256 nonce,bytes data,uint256 validUntilTime";

    string public constant EIP712_DOMAIN_TYPE = "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)";

    mapping(bytes32 => bool) public typeHashes;
    mapping(bytes32 => bool) public domains;

    // Nonces of senders, used to prevent replay attacks
    mapping(address => uint256) private nonces;

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

    /// @inheritdoc IForwarder
    function getNonce(address from)
    public view override
    returns (uint256) {
        return nonces[from];
    }

    constructor() {
        string memory requestType = string(abi.encodePacked("ForwardRequest(", GENERIC_PARAMS, ")"));
        registerRequestTypeInternal(requestType);
    }

    /// @inheritdoc IERC165
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
        return interfaceId == type(IForwarder).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /// @inheritdoc IForwarder
    function verify(
        ForwardRequest calldata req,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata sig)
    external override view {
        _verifyNonce(req);
        _verifySig(req, domainSeparator, requestTypeHash, suffixData, sig);
    }

    /// @inheritdoc IForwarder
    function execute(
        ForwardRequest calldata req,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata sig
    )
    external payable
    override
    returns (bool success, bytes memory ret) {
        _verifySig(req, domainSeparator, requestTypeHash, suffixData, sig);
        _verifyAndUpdateNonce(req);

        require(req.validUntilTime == 0 || req.validUntilTime > block.timestamp, "FWD: request expired");

        uint256 gasForTransfer = 0;
        if ( req.value != 0 ) {
            gasForTransfer = 40000; //buffer in case we need to move eth after the transaction.
        }
        bytes memory callData = abi.encodePacked(req.data, req.from);
        require(gasleft()*63/64 >= req.gas + gasForTransfer, "FWD: insufficient gas");
        // solhint-disable-next-line avoid-low-level-calls
        (success,ret) = req.to.call{gas : req.gas, value : req.value}(callData);

        if ( req.value != 0 && address(this).balance>0 ) {
            // can't fail: req.from signed (off-chain) the request, so it must be an EOA...
            payable(req.from).transfer(address(this).balance);
        }

        return (success,ret);
    }

    function _verifyNonce(ForwardRequest calldata req) internal view {
        require(nonces[req.from] == req.nonce, "FWD: nonce mismatch");
    }

    function _verifyAndUpdateNonce(ForwardRequest calldata req) internal {
        require(nonces[req.from]++ == req.nonce, "FWD: nonce mismatch");
    }

    /// @inheritdoc IForwarder
    function registerRequestType(string calldata typeName, string calldata typeSuffix) external override {

        for (uint256 i = 0; i < bytes(typeName).length; i++) {
            bytes1 c = bytes(typeName)[i];
            require(c != "(" && c != ")", "FWD: invalid typename");
        }

        string memory requestType = string(abi.encodePacked(typeName, "(", GENERIC_PARAMS, ",", typeSuffix));
        registerRequestTypeInternal(requestType);
    }

    /// @inheritdoc IForwarder
    function registerDomainSeparator(string calldata name, string calldata version) external override {
        uint256 chainId;
        /* solhint-disable-next-line no-inline-assembly */
        assembly { chainId := chainid() }

        bytes memory domainValue = abi.encode(
            keccak256(bytes(EIP712_DOMAIN_TYPE)),
            keccak256(bytes(name)),
            keccak256(bytes(version)),
            chainId,
            address(this));

        bytes32 domainHash = keccak256(domainValue);

        domains[domainHash] = true;
        emit DomainRegistered(domainHash, domainValue);
    }

    function registerRequestTypeInternal(string memory requestType) internal {

        bytes32 requestTypehash = keccak256(bytes(requestType));
        typeHashes[requestTypehash] = true;
        emit RequestTypeRegistered(requestTypehash, requestType);
    }

    function _verifySig(
        ForwardRequest calldata req,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata sig)
    internal
    virtual
    view
    {
        require(domains[domainSeparator], "FWD: unregistered domain sep.");
        require(typeHashes[requestTypeHash], "FWD: unregistered typehash");
        bytes32 digest = keccak256(abi.encodePacked(
                "\x19\x01", domainSeparator,
                keccak256(_getEncoded(req, requestTypeHash, suffixData))
            ));
        // solhint-disable-next-line avoid-tx-origin
        require(tx.origin == DRY_RUN_ADDRESS || digest.recover(sig) == req.from, "FWD: signature mismatch");
    }

    /**
     * @notice Creates a byte array that is a valid ABI encoding of a request of a `RequestType` type. See `execute()`.
     */
    function _getEncoded(
        ForwardRequest calldata req,
        bytes32 requestTypeHash,
        bytes calldata suffixData
    )
    public
    pure
    returns (
        bytes memory
    ) {
        // we use encodePacked since we append suffixData as-is, not as dynamic param.
        // still, we must make sure all first params are encoded as abi.encode()
        // would encode them - as 256-bit-wide params.
        return abi.encodePacked(
            requestTypeHash,
            uint256(uint160(req.from)),
            uint256(uint160(req.to)),
            req.value,
            req.gas,
            req.nonce,
            keccak256(req.data),
            req.validUntilTime,
            suffixData
        );
    }
}

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

pragma solidity ^0.8.0;

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

// 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 (last updated v4.5.0) (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
    }

    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 = 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 (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
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// 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);
}

pragma solidity >=0.7.6;
pragma abicoder v2;

// SPDX-License-Identifier: GPL-3.0-only

import "@openzeppelin/contracts/interfaces/IERC165.sol";

/**
 * @title The Forwarder Interface
 * @notice The contracts implementing this interface take a role of authorization, authentication and replay protection
 * for contracts that choose to trust a `Forwarder`, instead of relying on a mechanism built into the Ethereum protocol.
 *
 * @notice if the `Forwarder` contract decides that an incoming `ForwardRequest` is valid, it must append 20 bytes that
 * represent the caller to the `data` field of the request and send this new data to the target address (the `to` field)
 *
 * :warning: **Warning** :warning: The Forwarder can have a full control over a `Recipient` contract.
 * Any vulnerability in a `Forwarder` implementation can make all of its `Recipient` contracts susceptible!
 * Recipient contracts should only trust forwarders that passed through security audit,
 * otherwise they are susceptible to identity theft.
 */
interface IForwarder is IERC165 {

    /**
     * @notice A representation of a request for a `Forwarder` to send `data` on behalf of a `from` to a target (`to`).
     */
    struct ForwardRequest {
        address from;
        address to;
        uint256 value;
        uint256 gas;
        uint256 nonce;
        bytes data;
        uint256 validUntilTime;
    }

    event DomainRegistered(bytes32 indexed domainSeparator, bytes domainValue);

    event RequestTypeRegistered(bytes32 indexed typeHash, string typeStr);

    /**
     * @param from The address of a sender.
     * @return The nonce for this address.
     */
    function getNonce(address from)
    external view
    returns(uint256);

    /**
     * @notice Verify the transaction is valid and can be executed.
     * Implementations must validate the signature and the nonce of the request are correct.
     * Does not revert and returns successfully if the input is valid.
     * Reverts if any validation has failed. For instance, if either signature or nonce are incorrect.
     * Reverts if `domainSeparator` or `requestTypeHash` are not registered as well.
     */
    function verify(
        ForwardRequest calldata forwardRequest,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata signature
    ) external view;

    /**
     * @notice Executes a transaction specified by the `ForwardRequest`.
     * The transaction is first verified and then executed.
     * The success flag and returned bytes array of the `CALL` are returned as-is.
     *
     * This method would revert only in case of a verification error.
     *
     * All the target errors are reported using the returned success flag and returned bytes array.
     *
     * @param forwardRequest All requested transaction parameters.
     * @param domainSeparator The domain used when signing this request.
     * @param requestTypeHash The request type used when signing this request.
     * @param suffixData The ABI-encoded extension data for the current `RequestType` used when signing this request.
     * @param signature The client signature to be validated.
     *
     * @return success The success flag of the underlying `CALL` to the target address.
     * @return ret The byte array returned by the underlying `CALL` to the target address.
     */
    function execute(
        ForwardRequest calldata forwardRequest,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata signature
    )
    external payable
    returns (bool success, bytes memory ret);

    /**
     * @notice Register a new Request typehash.
     *
     * @notice This is necessary for the Forwarder to be able to verify the signatures conforming to the ERC-712.
     *
     * @param typeName The name of the request type.
     * @param typeSuffix Any extra data after the generic params. Must contain add at least one param.
     * The generic ForwardRequest type is always registered by the constructor.
     */
    function registerRequestType(string calldata typeName, string calldata typeSuffix) external;

    /**
     * @notice Register a new domain separator.
     *
     * @notice This is necessary for the Forwarder to be able to verify the signatures conforming to the ERC-712.
     *
     * @notice The domain separator must have the following fields: `name`, `version`, `chainId`, `verifyingContract`.
     * The `chainId` is the current network's `chainId`, and the `verifyingContract` is this Forwarder's address.
     * This method accepts the domain name and version to create and register the domain separator value.
     * @param name The domain's display name.
     * @param version The domain/protocol version.
     */
    function registerDomainSeparator(string calldata name, string calldata version) external;
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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