{ "fileName": "GSNRecipientSignature.sol", "contractName": "GSNRecipientSignatureUpgradeSafe", "source": "pragma solidity ^0.6.0;\n\nimport \"./GSNRecipient.sol\";\nimport \"../cryptography/ECDSA.sol\";\nimport \"../Initializable.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 GSNRecipientSignatureUpgradeSafe is Initializable, GSNRecipientUpgradeSafe {\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\n function __GSNRecipientSignature_init(address trustedSigner) internal initializer {\n __Context_init_unchained();\n __GSNRecipient_init_unchained();\n __GSNRecipientSignature_init_unchained(trustedSigner);\n }\n\n function __GSNRecipientSignature_init_unchained(address trustedSigner) internal initializer {\n\n\n require(trustedSigner != address(0), \"GSNRecipientSignature: trusted signer is the zero address\");\n _trustedSigner = trustedSigner;\n\n }\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 uint256[49] private __gap;\n}\n", "sourcePath": "contracts/GSN/GSNRecipientSignature.sol", "sourceMap": "558:2213:3:-:0;;;;5:9:-1;2:2;;;27:1;24;17:12;2:2;558:2213:3;;;;;;;", "deployedSourceMap": 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"abi": [ { "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": { "GSNRecipientSignatureUpgradeSafe": [ 1000 ] }, "id": 1001, "nodeType": "SourceUnit", "nodes": [ { "id": 846, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:3" }, { "absolutePath": "contracts/GSN/GSNRecipient.sol", "file": "./GSNRecipient.sol", "id": 847, "nodeType": "ImportDirective", "scope": 1001, "sourceUnit": 426, "src": "25:28:3", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "contracts/cryptography/ECDSA.sol", "file": "../cryptography/ECDSA.sol", "id": 848, "nodeType": "ImportDirective", "scope": 1001, "sourceUnit": 1926, "src": "54:35:3", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "contracts/Initializable.sol", "file": "../Initializable.sol", "id": 849, "nodeType": "ImportDirective", "scope": 1001, "sourceUnit": 1408, "src": "90:30:3", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 851, "name": "Initializable", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1407, "src": "603:13:3", "typeDescriptions": { "typeIdentifier": "t_contract$_Initializable_$1407", "typeString": "contract Initializable" } }, "id": 852, "nodeType": "InheritanceSpecifier", "src": "603:13:3" }, { "arguments": null, "baseName": { "contractScope": null, "id": 853, "name": "GSNRecipientUpgradeSafe", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 425, "src": "618:23:3", "typeDescriptions": { "typeIdentifier": "t_contract$_GSNRecipientUpgradeSafe_$425", "typeString": "contract GSNRecipientUpgradeSafe" } }, "id": 854, "nodeType": "InheritanceSpecifier", "src": "618:23:3" } ], "contractDependencies": [ 44, 425, 1334, 1407 ], "contractKind": "contract", "documentation": { "id": 850, "nodeType": "StructuredDocumentation", "src": "122:435:3", "text": "@dev A xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategy] that allows relayed transactions through when they are\naccompanied by the signature of a trusted signer. The intent is for this signature to be generated by a server that\nperforms validations off-chain. Note that nothing is charged to the user in this scheme. Thus, the server should make\nsure to account for this in their economic and threat model." }, "fullyImplemented": true, "id": 1000, "linearizedBaseContracts": [ 1000, 425, 44, 1334, 1407 ], "name": "GSNRecipientSignatureUpgradeSafe", "nodeType": "ContractDefinition", "nodes": [ { "id": 857, "libraryName": { "contractScope": null, "id": 855, "name": "ECDSA", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1925, "src": "654:5:3", "typeDescriptions": { "typeIdentifier": "t_contract$_ECDSA_$1925", "typeString": "library ECDSA" } }, "nodeType": "UsingForDirective", "src": "648:24:3", "typeName": { "id": 856, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "664:7:3", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } }, { "constant": false, "id": 859, "mutability": "mutable", "name": "_trustedSigner", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1000, "src": "678:30:3", "stateVariable": true, "storageLocation": 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"lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1077:53:3", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 878, "nodeType": "ExpressionStatement", "src": "1077:53:3" } ] }, "documentation": { "id": 862, "nodeType": "StructuredDocumentation", "src": "788:114:3", "text": "@dev Sets the trusted signer that is going to be producing signatures to approve relayed calls." }, "id": 880, "implemented": true, "kind": "function", "modifiers": [ { "arguments": null, "id": 867, "modifierName": { "argumentTypes": null, "id": 866, "name": "initializer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1380, "src": "978:11:3", "typeDescriptions": { "typeIdentifier": "t_modifier$__$", "typeString": "modifier ()" } }, "nodeType": "ModifierInvocation", "src": "978:11:3" } ], "name": "__GSNRecipientSignature_init", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { 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} ] }, "documentation": { "id": 903, "nodeType": "StructuredDocumentation", "src": "1399:111:3", "text": "@dev Ensures that only transactions with a trusted signature can be relayed through the GSN." }, "functionSelector": "83947ea0", "id": 973, "implemented": true, "kind": "function", "modifiers": [], "name": "acceptRelayedCall", "nodeType": "FunctionDefinition", "overrides": { "id": 923, "nodeType": "OverrideSpecifier", "overrides": [], "src": "1842:8:3" }, "parameters": { "id": 922, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 905, "mutability": "mutable", "name": "relay", "nodeType": "VariableDeclaration", "overrides": null, "scope": 973, "src": "1551:13:3", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 904, "name": "address", "nodeType": "ElementaryTypeName", "src": "1551:7:3", "stateMutability": "nonpayable", "typeDescriptions": { 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