{ "contractName": "SignedMessageOracleProxy", "abi": [ { "constant": true, "inputs": [], "name": "signer", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "outcome", "outputs": [ { "name": "", "type": "int256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "descriptionHash", "outputs": [ { "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "masterCopy", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "isSet", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [ { "name": "proxied", "type": "address" }, { "name": "_descriptionHash", "type": "bytes32" }, { "name": "v", "type": "uint8" }, { "name": "r", "type": "bytes32" }, { "name": "s", "type": "bytes32" } ], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "payable": true, "stateMutability": "payable", "type": "fallback" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "newSigner", "type": "address" } ], "name": "SignerReplacement", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "outcome", "type": "int256" } ], "name": "OutcomeAssignment", "type": "event" } ], "metadata": 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"601:563:23:-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;848:19:29;870:10;;;;;;;;;;;848:32;;932:14;929:1;926;913:34;1031:1;1028;1012:14;1009:1;996:11;992:1;988:6;975:58;1067:16;1064:1;1061;1046:38;1104:7;1129:1;1124:38;;;;1195:16;1192:1;1185:27;1124:38;1143:16;1140:1;1133:27;314:21:23;;8:9:-1;5:2;;;30:1;27;20:12;5:2;314:21:23;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;;;;416:18;;8:9:-1;5:2;;;30:1;27;20:12;5:2;416:18:23;;;:::i;:::-;;;;;;;;;;;;;;;;;;;341:30;;8:9:-1;5:2;;;30:1;27;20:12;5:2;341:30:23;;;:::i;:::-;;;;;;;;;;;;;;;;;;;205:25:29;;8:9:-1;5:2;;;30:1;27;20:12;5:2;205:25:29;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;;;;393:17:23;;8:9:-1;5:2;;;30:1;27;20:12;5:2;393:17:23;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;;;;314:21;;;;;;;;;;;;;:::o;416:18::-;;;;:::o;341:30::-;;;;:::o;205:25:29:-;;;;;;;;;;;;;:::o;393:17:23:-;;;;;;;;;;;;;:::o", "source": "pragma solidity ^0.5.0;\nimport \"../Oracles/Oracle.sol\";\nimport \"@gnosis.pm/util-contracts/contracts/Proxy.sol\";\n\n\ncontract SignedMessageOracleData {\n\n /*\n * Events\n */\n event SignerReplacement(address indexed newSigner);\n event OutcomeAssignment(int outcome);\n\n /*\n * Storage\n */\n address public signer;\n bytes32 public descriptionHash;\n uint nonce;\n bool public isSet;\n int public outcome;\n\n /*\n * Modifiers\n */\n modifier isSigner () {\n // Only signer is allowed to proceed\n require(msg.sender == signer);\n _;\n }\n}\n\ncontract SignedMessageOracleProxy is Proxy, SignedMessageOracleData {\n\n /// @dev Constructor sets signer address based on signature\n /// @param _descriptionHash Hash identifying off chain event description\n /// @param v Signature parameter\n /// @param r Signature parameter\n /// @param s Signature parameter\n constructor(address proxied, bytes32 _descriptionHash, uint8 v, bytes32 r, bytes32 s)\n Proxy(proxied)\n public\n {\n signer = ecrecover(_descriptionHash, v, r, s);\n descriptionHash = _descriptionHash;\n }\n}\n\n/// @title Signed message oracle contract - Allows to set an outcome with a signed message\n/// @author Stefan George - \ncontract SignedMessageOracle is Proxied, Oracle, SignedMessageOracleData {\n\n /*\n * Public functions\n */\n /// @dev Replaces signer\n /// @param newSigner New signer\n /// @param _nonce Unique nonce to prevent replay attacks\n /// @param v Signature parameter\n /// @param r Signature parameter\n /// @param s Signature parameter\n function replaceSigner(address newSigner, uint _nonce, uint8 v, bytes32 r, bytes32 s)\n public\n isSigner\n {\n // Result is not set yet and nonce and signer are valid\n require( !isSet\n && _nonce > nonce\n && signer == ecrecover(keccak256(abi.encodePacked(descriptionHash, newSigner, _nonce)), v, r, s));\n nonce = _nonce;\n signer = newSigner;\n emit SignerReplacement(newSigner);\n }\n\n /// @dev Sets outcome based on signed message\n /// @param _outcome Signed event outcome\n /// @param v Signature parameter\n /// @param r Signature parameter\n /// @param s Signature parameter\n function setOutcome(int _outcome, uint8 v, bytes32 r, bytes32 s)\n public\n {\n // Result is not set yet and signer is valid\n require( !isSet\n && signer == ecrecover(keccak256(abi.encodePacked(descriptionHash, _outcome)), v, r, s));\n isSet = true;\n outcome = _outcome;\n emit OutcomeAssignment(_outcome);\n }\n\n /// @dev Returns if winning outcome\n /// @return Is outcome set?\n function isOutcomeSet()\n public\n view\n returns (bool)\n {\n return isSet;\n }\n\n /// @dev Returns winning outcome\n /// @return Outcome\n function getOutcome()\n public\n view\n returns (int)\n {\n return outcome;\n }\n}\n", "sourcePath": "/home/alan/src/github.com/gnosis/pm-contracts/contracts/Oracles/SignedMessageOracle.sol", "ast": { "absolutePath": "/home/alan/src/github.com/gnosis/pm-contracts/contracts/Oracles/SignedMessageOracle.sol", "exportedSymbols": { "SignedMessageOracle": [ 5030 ], "SignedMessageOracleData": [ 4875 ], "SignedMessageOracleProxy": [ 4910 ] }, "id": 5031, "nodeType": "SourceUnit", "nodes": [ { "id": 4843, "literals": [ 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