{ "contractName": "GsnEip712Library", "abi": [ { "inputs": [], "name": "EIP712DOMAIN_TYPEHASH", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "GENERIC_PARAMS", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAYDATA_TYPE", "outputs": [ { "internalType": "bytes", "name": "", "type": "bytes" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAYDATA_TYPEHASH", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAY_REQUEST_NAME", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAY_REQUEST_SUFFIX", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAY_REQUEST_TYPE", "outputs": [ { "internalType": "bytes", "name": "", "type": "bytes" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "RELAY_REQUEST_TYPEHASH", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "stateMutability": "view", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.8.7+commit.e28d00a7\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[],\"name\":\"EIP712DOMAIN_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"GENERIC_PARAMS\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAYDATA_TYPE\",\"outputs\":[{\"internalType\":\"bytes\",\"name\":\"\",\"type\":\"bytes\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAYDATA_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAY_REQUEST_NAME\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAY_REQUEST_SUFFIX\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAY_REQUEST_TYPE\",\"outputs\":[{\"internalType\":\"bytes\",\"name\":\"\",\"type\":\"bytes\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"RELAY_REQUEST_TYPEHASH\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"title\":\"The ERC-712 Library for GSN\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"notice\":\"Bridge Library to convert a GSN RelayRequest into a valid `ForwardRequest` for a 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"source": "pragma solidity ^0.8.0;\npragma abicoder v2;\n\n// SPDX-License-Identifier: GPL-3.0-only\n\nimport \"../utils/GsnTypes.sol\";\nimport \"../interfaces/IERC2771Recipient.sol\";\nimport \"../forwarder/IForwarder.sol\";\n\nimport \"./GsnUtils.sol\";\n\n/**\n * @title The ERC-712 Library for GSN\n * @notice Bridge Library to convert a GSN RelayRequest into a valid `ForwardRequest` for a `Forwarder`.\n */\nlibrary GsnEip712Library {\n // maximum length of return value/revert reason for 'execute' method. Will truncate result if exceeded.\n uint256 private constant MAX_RETURN_SIZE = 1024;\n\n //copied from Forwarder (can't reference string constants even from another library)\n string public constant GENERIC_PARAMS = \"address from,address to,uint256 value,uint256 gas,uint256 nonce,bytes data,uint256 validUntilTime\";\n\n bytes public constant RELAYDATA_TYPE = \"RelayData(uint256 maxFeePerGas,uint256 maxPriorityFeePerGas,uint256 transactionCalldataGasUsed,address relayWorker,address paymaster,address forwarder,bytes paymasterData,uint256 clientId)\";\n\n string public constant RELAY_REQUEST_NAME = \"RelayRequest\";\n string public constant RELAY_REQUEST_SUFFIX = string(abi.encodePacked(\"RelayData relayData)\", RELAYDATA_TYPE));\n\n bytes public constant RELAY_REQUEST_TYPE = abi.encodePacked(\n RELAY_REQUEST_NAME,\"(\",GENERIC_PARAMS,\",\", RELAY_REQUEST_SUFFIX);\n\n bytes32 public constant RELAYDATA_TYPEHASH = keccak256(RELAYDATA_TYPE);\n bytes32 public constant RELAY_REQUEST_TYPEHASH = keccak256(RELAY_REQUEST_TYPE);\n\n struct EIP712Domain {\n string name;\n string version;\n uint256 chainId;\n address verifyingContract;\n }\n\n bytes32 public constant EIP712DOMAIN_TYPEHASH = keccak256(\n \"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"\n );\n\n function splitRequest(\n GsnTypes.RelayRequest calldata req\n )\n internal\n pure\n returns (\n bytes memory suffixData\n ) {\n suffixData = abi.encode(\n hashRelayData(req.relayData));\n }\n\n //verify that the recipient trusts the given forwarder\n // MUST be called by paymaster\n function verifyForwarderTrusted(GsnTypes.RelayRequest calldata relayRequest) internal view {\n (bool success, bytes memory ret) = relayRequest.request.to.staticcall(\n abi.encodeWithSelector(\n IERC2771Recipient.isTrustedForwarder.selector, relayRequest.relayData.forwarder\n )\n );\n require(success, \"isTrustedForwarder: reverted\");\n require(ret.length == 32, \"isTrustedForwarder: bad response\");\n require(abi.decode(ret, (bool)), \"invalid forwarder for recipient\");\n }\n\n function verifySignature(\n string memory domainSeparatorName,\n GsnTypes.RelayRequest calldata relayRequest,\n bytes calldata signature\n ) internal view {\n (bytes memory suffixData) = splitRequest(relayRequest);\n bytes32 _domainSeparator = domainSeparator(domainSeparatorName, relayRequest.relayData.forwarder);\n IForwarder forwarder = IForwarder(payable(relayRequest.relayData.forwarder));\n forwarder.verify(relayRequest.request, _domainSeparator, RELAY_REQUEST_TYPEHASH, suffixData, signature);\n }\n\n function verify(\n string memory domainSeparatorName,\n GsnTypes.RelayRequest calldata relayRequest,\n bytes calldata signature\n ) internal view {\n verifyForwarderTrusted(relayRequest);\n verifySignature(domainSeparatorName, relayRequest, signature);\n }\n\n function execute(\n string memory domainSeparatorName,\n GsnTypes.RelayRequest calldata relayRequest,\n bytes calldata signature\n ) internal returns (\n bool forwarderSuccess,\n bool callSuccess,\n bytes memory ret\n ) {\n (bytes memory suffixData) = splitRequest(relayRequest);\n bytes32 _domainSeparator = domainSeparator(domainSeparatorName, relayRequest.relayData.forwarder);\n /* solhint-disable-next-line avoid-low-level-calls */\n (forwarderSuccess, ret) = relayRequest.relayData.forwarder.call(\n abi.encodeWithSelector(IForwarder.execute.selector,\n relayRequest.request, _domainSeparator, RELAY_REQUEST_TYPEHASH, suffixData, signature\n ));\n if ( forwarderSuccess ) {\n\n //decode return value of execute:\n (callSuccess, ret) = abi.decode(ret, (bool, bytes));\n }\n truncateInPlace(ret);\n }\n\n //truncate the given parameter (in-place) if its length is above the given maximum length\n // do nothing otherwise.\n //NOTE: solidity warns unless the method is marked \"pure\", but it DOES modify its parameter.\n function truncateInPlace(bytes memory data) internal pure {\n MinLibBytes.truncateInPlace(data, MAX_RETURN_SIZE);\n }\n\n function domainSeparator(string memory name, address forwarder) internal view returns (bytes32) {\n return hashDomain(EIP712Domain({\n name : name,\n version : \"3\",\n chainId : getChainID(),\n verifyingContract : forwarder\n }));\n }\n\n function getChainID() internal view returns (uint256 id) {\n /* solhint-disable no-inline-assembly */\n assembly {\n id := chainid()\n }\n }\n\n function hashDomain(EIP712Domain memory req) internal pure returns (bytes32) {\n return keccak256(abi.encode(\n EIP712DOMAIN_TYPEHASH,\n keccak256(bytes(req.name)),\n keccak256(bytes(req.version)),\n req.chainId,\n req.verifyingContract));\n }\n\n function hashRelayData(GsnTypes.RelayData calldata req) internal pure returns (bytes32) {\n return keccak256(abi.encode(\n RELAYDATA_TYPEHASH,\n req.maxFeePerGas,\n req.maxPriorityFeePerGas,\n req.transactionCalldataGasUsed,\n req.relayWorker,\n req.paymaster,\n req.forwarder,\n keccak256(req.paymasterData),\n req.clientId\n ));\n }\n}", "sourcePath": 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"typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 8434, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "5723:7:38", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "5722:9:38" }, "scope": 8464, "src": "5644:478:38", "stateMutability": "pure", "virtual": false, "visibility": "internal" } ], "scope": 8465, "src": "381:5743:38", "usedErrors": [] } ], "src": "0:6124:38" }, "compiler": { "name": "solc", "version": "0.8.7+commit.e28d00a7.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.1.0", "updatedAt": "2023-03-16T16:54:15.244Z", "devdoc": { "kind": "dev", "methods": {}, "title": "The ERC-712 Library for GSN", "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "notice": "Bridge Library to convert a GSN RelayRequest into a valid `ForwardRequest` for a `Forwarder`.", "version": 1 } }