{ "fileName": "GSNRecipientSignature.sol", "contractName": "GSNRecipientSignature", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./GSNRecipient.sol\";\nimport \"../cryptography/ECDSA.sol\";\n\n/**\n * @dev A xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategy] that allows relayed transactions through when they are\n * accompanied by the signature of a trusted signer. The intent is for this signature to be generated by a server that\n * performs validations off-chain. Note that nothing is charged to the user in this scheme. Thus, the server should make\n * sure to account for this in their economic and threat model.\n */\ncontract GSNRecipientSignature is GSNRecipient {\n using ECDSA for bytes32;\n\n address private _trustedSigner;\n\n enum GSNRecipientSignatureErrorCodes {\n INVALID_SIGNER\n }\n\n /**\n * @dev Sets the trusted signer that is going to be producing signatures to approve relayed calls.\n */\n constructor(address trustedSigner) {\n require(trustedSigner != address(0), \"GSNRecipientSignature: trusted signer is the zero address\");\n _trustedSigner = trustedSigner;\n }\n\n /**\n * @dev Ensures that only transactions with a trusted signature can be relayed through the GSN.\n */\n function acceptRelayedCall(\n address relay,\n address from,\n bytes memory encodedFunction,\n uint256 transactionFee,\n uint256 gasPrice,\n uint256 gasLimit,\n uint256 nonce,\n bytes memory approvalData,\n uint256\n )\n public\n view\n virtual\n override\n returns (uint256, bytes memory)\n {\n bytes memory blob = abi.encodePacked(\n relay,\n from,\n encodedFunction,\n transactionFee,\n gasPrice,\n gasLimit,\n nonce, // Prevents replays on RelayHub\n getHubAddr(), // Prevents replays in multiple RelayHubs\n address(this) // Prevents replays in multiple recipients\n );\n if (keccak256(blob).toEthSignedMessageHash().recover(approvalData) == _trustedSigner) {\n return _approveRelayedCall();\n } else {\n return _rejectRelayedCall(uint256(GSNRecipientSignatureErrorCodes.INVALID_SIGNER));\n }\n }\n\n function _preRelayedCall(bytes memory) internal virtual override returns (bytes32) { }\n\n function _postRelayedCall(bytes memory, bool, uint256, bytes32) internal virtual override { }\n}\n", "sourcePath": "contracts/GSN/GSNRecipientSignature.sol", "sourceMap": "560:1847:3:-:0;;;885:42:1;857:70;;;;;;;;;;;;;;;;;;;;872:189:3;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;950:1;925:27;;:13;:27;;;;917:97;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;1041:13;1024:14;;:30;;;;;;;;;;;;;;;;;;872:189;560:1847;;;;;;", 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"abi": [ { "inputs": [ { "internalType": "address", "name": "trustedSigner", "type": "address" } ], "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "oldRelayHub", "type": "address" }, { "indexed": true, "internalType": "address", "name": "newRelayHub", "type": "address" } ], "name": "RelayHubChanged", "type": "event" }, { "inputs": [ { "internalType": "address", "name": "relay", "type": "address" }, { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "bytes", "name": "encodedFunction", "type": "bytes" }, { "internalType": "uint256", "name": "transactionFee", "type": "uint256" }, { "internalType": "uint256", "name": "gasPrice", "type": "uint256" }, { "internalType": "uint256", "name": "gasLimit", "type": "uint256" }, { "internalType": "uint256", "name": "nonce", "type": "uint256" }, { "internalType": "bytes", "name": "approvalData", "type": "bytes" }, { "internalType": "uint256", "name": "", "type": "uint256" } ], "name": "acceptRelayedCall", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "bytes", "name": "", "type": "bytes" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "getHubAddr", "outputs": [ { "internalType": "address", "name": "", "type": "address" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "bytes", "name": "context", "type": "bytes" }, { "internalType": "bool", "name": "success", "type": "bool" }, { "internalType": "uint256", "name": "actualCharge", "type": "uint256" }, { "internalType": "bytes32", "name": "preRetVal", "type": "bytes32" } ], "name": "postRelayedCall", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "bytes", "name": "context", "type": "bytes" } ], "name": "preRelayedCall", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [], "name": "relayHubVersion", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" } ], "ast": { "absolutePath": "contracts/GSN/GSNRecipientSignature.sol", "exportedSymbols": { "GSNRecipientSignature": [ 850 ] }, "id": 851, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 723, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:3" }, { "absolutePath": "contracts/GSN/GSNRecipient.sol", "file": "./GSNRecipient.sol", "id": 724, "nodeType": "ImportDirective", "scope": 851, "sourceUnit": 376, "src": "58:28:3", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "contracts/cryptography/ECDSA.sol", "file": "../cryptography/ECDSA.sol", "id": 725, "nodeType": "ImportDirective", "scope": 851, "sourceUnit": 1675, "src": "87:35:3", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 727, "name": "GSNRecipient", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 375, "src": "594:12:3", "typeDescriptions": { "typeIdentifier": "t_contract$_GSNRecipient_$375", "typeString": "contract GSNRecipient" } }, "id": 728, "nodeType": "InheritanceSpecifier", "src": "594:12:3" } ], "contractDependencies": [ 22, 375, 1184 ], "contractKind": "contract", "documentation": { "id": 726, "nodeType": "StructuredDocumentation", "src": "124:435:3", "text": " @dev A xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategy] that allows relayed transactions through when they are\n accompanied by the signature of a trusted signer. The intent is for this signature to be generated by a server that\n performs validations off-chain. Note that nothing is charged to the user in this scheme. Thus, the server should make\n sure to account for this in their economic and threat model." }, "fullyImplemented": true, "id": 850, "linearizedBaseContracts": [ 850, 375, 22, 1184 ], "name": "GSNRecipientSignature", "nodeType": "ContractDefinition", "nodes": [ { "id": 731, "libraryName": { "contractScope": null, "id": 729, "name": "ECDSA", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1674, "src": "619:5:3", "typeDescriptions": { "typeIdentifier": "t_contract$_ECDSA_$1674", "typeString": "library ECDSA" } }, "nodeType": "UsingForDirective", "src": "613:24:3", "typeName": { "id": 730, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "629:7:3", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } }, { "constant": false, "id": 733, "mutability": "mutable", "name": "_trustedSigner", "nodeType": "VariableDeclaration", "overrides": null, "scope": 850, "src": "643:30:3", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 732, "name": "address", "nodeType": "ElementaryTypeName", "src": "643:7:3", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "private" }, { "canonicalName": "GSNRecipientSignature.GSNRecipientSignatureErrorCodes", "id": 735, "members": [ { "id": 734, "name": "INVALID_SIGNER", "nodeType": "EnumValue", "src": "727:14:3" } ], "name": "GSNRecipientSignatureErrorCodes", "nodeType": "EnumDefinition", "src": "680:67:3" }, { "body": { "id": 755, "nodeType": "Block", "src": "907:154:3", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 747, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 742, "name": "trustedSigner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 738, "src": "925:13:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 745, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "950:1:3", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 744, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "942:7:3", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 743, "name": "address", "nodeType": "ElementaryTypeName", "src": "942:7:3", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 746, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "942:10:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "925:27:3", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "47534e526563697069656e745369676e61747572653a2074727573746564207369676e657220697320746865207a65726f2061646472657373", "id": 748, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "954:59:3", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_b449863bc8ef919e776559b9a0800b6601550a12ec4edf55e3d3f41dc6eeaa03", "typeString": "literal_string \"GSNRecipientSignature: trusted signer is the zero address\"" }, "value": "GSNRecipientSignature: trusted signer is the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_b449863bc8ef919e776559b9a0800b6601550a12ec4edf55e3d3f41dc6eeaa03", "typeString": "literal_string \"GSNRecipientSignature: trusted signer is the zero address\"" } ], "id": 741, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "917:7:3", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 749, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "917:97:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 750, "nodeType": "ExpressionStatement", "src": "917:97:3" }, { "expression": { "argumentTypes": null, "id": 753, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 751, "name": "_trustedSigner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 733, "src": "1024:14:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 752, "name": "trustedSigner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 738, "src": "1041:13:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "1024:30:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 754, "nodeType": "ExpressionStatement", "src": "1024:30:3" } ] }, "documentation": { "id": 736, "nodeType": "StructuredDocumentation", "src": "753:114:3", "text": " @dev Sets the trusted signer that is going to be producing signatures to approve relayed calls." }, "id": 756, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 739, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 738, "mutability": "mutable", "name": "trustedSigner", "nodeType": "VariableDeclaration", "overrides": null, "scope": 756, "src": "884:21:3", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 737, "name": "address", "nodeType": "ElementaryTypeName", "src": "884:7:3", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "src": "883:23:3" }, "returnParameters": { "id": 740, "nodeType": "ParameterList", "parameters": [], "src": "907:0:3" }, "scope": 850, "src": "872:189:3", "stateMutability": "nonpayable", "virtual": false, "visibility": "public" }, { "baseFunctions": [ 1163 ], "body": { "id": 826, "nodeType": "Block", "src": "1563:651:3", "statements": [ { "assignments": [ 784 ], "declarations": [ { "constant": false, "id": 784, "mutability": "mutable", "name": "blob", "nodeType": "VariableDeclaration", "overrides": null, "scope": 826, "src": "1573:17:3", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 783, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1573:5:3", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 801, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 787, "name": "relay", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 759, "src": "1623:5:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 788, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 761, "src": "1642:4:3", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 789, "name": "encodedFunction", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 763, "src": "1660:15:3", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 790, "name": "transactionFee", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 765, "src": "1689:14:3", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 791, "name": "gasPrice", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 767, "src": "1717:8:3", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 792, "name": "gasLimit", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 769, "src": "1739:8:3", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 793, "name": "nonce", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 771, "src": "1761:5:3", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "id": 794, "name": "getHubAddr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 61, "src": "1812:10:3", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 795, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1812:12:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 798, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "1888:4:3", "typeDescriptions": { "typeIdentifier": "t_contract$_GSNRecipientSignature_$850", "typeString": "contract GSNRecipientSignature" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_GSNRecipientSignature_$850", "typeString": "contract GSNRecipientSignature" } ], "id": 797, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1880:7:3", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 796, "name": "address", "nodeType": "ElementaryTypeName", "src": "1880:7:3", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 799, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1880:13:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { 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