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"source": "pragma solidity ^0.4.24;\n\nimport \"./BasicOracle.sol\";\nimport \"openzeppelin-eth/contracts/cryptography/ECDSA.sol\";\n\n/**\n * @title SignedOracle\n * @dev Extends BasicOracle to allow any address to resolve the oracle with a\n * signed message from the data source\n */\ncontract SignedOracle is BasicOracle {\n\n /**\n * @dev SignedOracle constructor\n * @param _dataSource The address that is able to set the result\n */\n function initialize(\n address _dataSource\n )\n public\n initializer\n {\n BasicOracle.initialize(_dataSource);\n }\n\n /**\n * @dev Sets the result of the oracle with a signed message\n * @param _result The result being set\n * @param _signature The hash of the result signed by the data source\n */\n function setResult(bytes _result, bytes _signature) public {\n // Generate message hash\n bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, _result));\n\n // Recover signer from the signature with messageSigned\n address signer = ECDSA.recover(prefixedHash, _signature);\n\n // Check that the signer is the dataSource\n require(signer == dataSource, \"Invalid signature\");\n\n _setResult(_result);\n }\n\n}\n", "sourcePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/SignedOracle.sol", "ast": { "absolutePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/SignedOracle.sol", "exportedSymbols": { "SignedOracle": [ 1026 ] }, "id": 1027, "nodeType": "SourceUnit", "nodes": [ { "id": 966, "literals": [ "solidity", "^", "0.4", ".24" ], "nodeType": "PragmaDirective", "src": "0:24:19" }, { "absolutePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/BasicOracle.sol", "file": "./BasicOracle.sol", "id": 967, "nodeType": "ImportDirective", "scope": 1027, "sourceUnit": 257, "src": "26:27:19", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "openzeppelin-eth/contracts/cryptography/ECDSA.sol", "file": "openzeppelin-eth/contracts/cryptography/ECDSA.sol", "id": 968, "nodeType": "ImportDirective", "scope": 1027, "sourceUnit": 2876, "src": "54:59:19", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 969, "name": "BasicOracle", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 256, "src": "288:11:19", "typeDescriptions": { "typeIdentifier": "t_contract$_BasicOracle_$256", "typeString": "contract BasicOracle" } }, "id": 970, "nodeType": "InheritanceSpecifier", "src": "288:11:19" } ], "contractDependencies": [ 256, 273, 734, 3241 ], "contractKind": "contract", "documentation": "@title SignedOracle\n@dev Extends BasicOracle to allow any address to resolve the oracle with a\nsigned message from the data source", "fullyImplemented": true, "id": 1026, "linearizedBaseContracts": [ 1026, 256, 734, 273, 3241 ], "name": "SignedOracle", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 983, "nodeType": "Block", "src": "497:46:19", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 980, "name": "_dataSource", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 972, "src": "526:11:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 977, "name": "BasicOracle", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 256, "src": "503:11:19", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_BasicOracle_$256_$", "typeString": "type(contract BasicOracle)" } }, "id": 979, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "initialize", "nodeType": "MemberAccess", "referencedDeclaration": 237, "src": "503:22:19", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$returns$__$", "typeString": "function (address)" } }, "id": 981, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "503:35:19", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 982, "nodeType": "ExpressionStatement", "src": "503:35:19" } ] }, "documentation": "@dev SignedOracle constructor\n@param _dataSource The address that is able to set the result", "id": 984, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [ { "arguments": null, "id": 975, "modifierName": { "argumentTypes": null, "id": 974, "name": "initializer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3222, "src": "483:11:19", "typeDescriptions": { "typeIdentifier": "t_modifier$__$", "typeString": "modifier ()" } }, "nodeType": "ModifierInvocation", "src": "483:11:19" } ], "name": "initialize", "nodeType": "FunctionDefinition", "parameters": { "id": 973, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 972, "name": "_dataSource", "nodeType": "VariableDeclaration", "scope": 984, "src": "444:19:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 971, "name": "address", "nodeType": "ElementaryTypeName", "src": "444:7:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "src": "438:29:19" }, "payable": false, "returnParameters": { "id": 976, "nodeType": "ParameterList", "parameters": [], "src": "497:0:19" }, "scope": 1026, "src": "419:124:19", "stateMutability": "nonpayable", "superFunction": 237, "visibility": "public" }, { "body": { "id": 1024, "nodeType": "Block", "src": "793:422:19", "statements": [ { "assignments": [ 992 ], "declarations": [ { "constant": false, "id": 992, "name": "prefix", "nodeType": "VariableDeclaration", "scope": 1025, "src": "828:19:19", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 991, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "828:5:19", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 994, "initialValue": { "argumentTypes": null, "hexValue": "19457468657265756d205369676e6564204d6573736167653a0a3332", "id": 993, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "850:34:19", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_178a2411ab6fbc1ba11064408972259c558d0e82fd48b0aba3ad81d14f065e73", "typeString": "literal_string \"\u0019Ethereum Signed Message:\n32\"" }, "value": "\u0019Ethereum Signed Message:\n32" }, "nodeType": "VariableDeclarationStatement", "src": "828:56:19" }, { "assignments": [ 996 ], "declarations": [ { "constant": false, "id": 996, "name": "prefixedHash", "nodeType": "VariableDeclaration", "scope": 1025, "src": "890:20:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 995, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "890:7:19", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 1004, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1000, "name": "prefix", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 992, "src": "940:6:19", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 1001, "name": "_result", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 986, "src": "948:7:19", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "expression": { "argumentTypes": null, "id": 998, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3243, "src": "923:3:19", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 999, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "923:16:19", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 1002, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "923:33:19", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 997, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3250, "src": "913:9:19", "typeDescriptions": { "typeIdentifier": "t_function_sha3_pure$__$returns$_t_bytes32_$", "typeString": "function () pure returns (bytes32)" } }, "id": 1003, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "913:44:19", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "VariableDeclarationStatement", "src": "890:67:19" }, { "assignments": [ 1006 ], "declarations": [ { "constant": false, "id": 1006, "name": "signer", "nodeType": "VariableDeclaration", "scope": 1025, "src": "1024:14:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 1005, "name": "address", "nodeType": "ElementaryTypeName", "src": "1024:7:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "id": 1012, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1009, "name": "prefixedHash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 996, "src": "1055:12:19", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, 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