Contract 0xda78a11fd57af7be2edd804840ea7f4c2a38801d 1

 
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0x4770b73a978ce0af632ddb0595b1252cb6ed3d170ed2d1ebe10598096167708c141194542021-05-05 11:56:1783 days 21 hrs ago0x8c1fd2de219c98f5f88620422e36a8a32f83324e IN  0xda78a11fd57af7be2edd804840ea7f4c2a38801d0 MATIC0.000048133
0x892cd6ed2fc08739507d501653df0400cc713cb6fef94e9fb0fb7bd080d112c0141194522021-05-05 11:56:1383 days 21 hrs ago0x8c1fd2de219c98f5f88620422e36a8a32f83324e IN  0xda78a11fd57af7be2edd804840ea7f4c2a38801d0 MATIC0.000054774
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Contract Source Code Verified (Exact Match)

Contract Name:
Forwarder

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

// File: @openzeppelin/contracts/cryptography/ECDSA.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 {
    /**
     * @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) {
        // Check the signature length
        if (signature.length != 65) {
            revert("ECDSA: invalid signature length");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        // 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 (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): 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.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * replicates the behavior of the
     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
     * JSON-RPC method.
     *
     * 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));
    }
}

// File: src/forwarder/IForwarder.sol

// (SPDX)-License-Identifier:MIT
pragma solidity >=0.7.6;
pragma abicoder v2;

interface IForwarder {

    struct ForwardRequest {
        address from;
        address to;
        uint256 value;
        uint256 gas;
        uint256 nonce;
        bytes data;
        uint256 validUntil;
    }

    event DomainRegistered(bytes32 indexed domainSeparator, bytes domainValue);

    event RequestTypeRegistered(bytes32 indexed typeHash, string typeStr);

    function getNonce(address from)
    external view
    returns(uint256);

    /**
     * verify the transaction would execute.
     * validate the signature and the nonce of the request.
     * revert if either signature or nonce are incorrect.
     * also revert if domainSeparator or requestTypeHash are not registered.
     */
    function verify(
        ForwardRequest calldata forwardRequest,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata signature
    ) external view;

    /**
     * execute a transaction
     * @param forwardRequest - all transaction parameters
     * @param domainSeparator - domain used when signing this request
     * @param requestTypeHash - request type used when signing this request.
     * @param suffixData - the extension data used when signing this request.
     * @param signature - signature to validate.
     *
     * the transaction is verified, and then executed.
     * the success and ret of "call" are returned.
     * This method would revert only verification errors. target errors
     * are reported using the returned "success" and ret string
     */
    function execute(
        ForwardRequest calldata forwardRequest,
        bytes32 domainSeparator,
        bytes32 requestTypeHash,
        bytes calldata suffixData,
        bytes calldata signature
    )
    external payable
    returns (bool success, bytes memory ret);

    /**
     * Register a new Request typehash.
     * @param typeName - the name of the request type.
     * @param typeSuffix - any extra data after the generic params.
     *  (must add at least one param. The generic ForwardRequest type is always registered by the constructor)
     */
    function registerRequestType(string calldata typeName, string calldata typeSuffix) external;

    /**
     * Register a new domain separator.
     * 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.
     * This method is given 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;
}

// File: src/forwarder/Forwarder.sol

// (SPDX)-License-Identifier:MIT
pragma solidity ^0.7.6;
// pragma abicoder v2;



contract Forwarder is IForwarder {
    using ECDSA for bytes32;

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

    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 {}

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

    constructor() {

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

    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);
    }

    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.validUntil == 0 || req.validUntil > block.number, "FWD: request expired");

        uint 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");
    }

    function registerRequestType(string calldata typeName, string calldata typeSuffix) external override {

        for (uint 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);
    }

    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
    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))
            ));
        require(digest.recover(sig) == req.from, "FWD: signature mismatch");
    }

    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.validUntil,
            suffixData
        );
    }
}

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"domainSeparator","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"domainValue","type":"bytes"}],"name":"DomainRegistered","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"typeHash","type":"bytes32"},{"indexed":false,"internalType":"string","name":"typeStr","type":"string"}],"name":"RequestTypeRegistered","type":"event"},{"inputs":[],"name":"EIP712_DOMAIN_TYPE","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GENERIC_PARAMS","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"gas","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"validUntil","type":"uint256"}],"internalType":"struct IForwarder.ForwardRequest","name":"req","type":"tuple"},{"internalType":"bytes32","name":"requestTypeHash","type":"bytes32"},{"internalType":"bytes","name":"suffixData","type":"bytes"}],"name":"_getEncoded","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"domains","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"gas","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"validUntil","type":"uint256"}],"internalType":"struct IForwarder.ForwardRequest","name":"req","type":"tuple"},{"internalType":"bytes32","name":"domainSeparator","type":"bytes32"},{"internalType":"bytes32","name":"requestTypeHash","type":"bytes32"},{"internalType":"bytes","name":"suffixData","type":"bytes"},{"internalType":"bytes","name":"sig","type":"bytes"}],"name":"execute","outputs":[{"internalType":"bool","name":"success","type":"bool"},{"internalType":"bytes","name":"ret","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"}],"name":"getNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"version","type":"string"}],"name":"registerDomainSeparator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"typeName","type":"string"},{"internalType":"string","name":"typeSuffix","type":"string"}],"name":"registerRequestType","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"typeHashes","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"gas","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"validUntil","type":"uint256"}],"internalType":"struct IForwarder.ForwardRequest","name":"req","type":"tuple"},{"internalType":"bytes32","name":"domainSeparator","type":"bytes32"},{"internalType":"bytes32","name":"requestTypeHash","type":"bytes32"},{"internalType":"bytes","name":"suffixData","type":"bytes"},{"internalType":"bytes","name":"sig","type":"bytes"}],"name":"verify","outputs":[],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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