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"source": "pragma solidity 0.4.23;\nimport \"../Enum.sol\";\nimport \"../Module.sol\";\nimport \"../ModuleManager.sol\";\nimport \"../OwnerManager.sol\";\n\n\n/// @title Social Recovery Module - Allows to replace an owner without Safe confirmations if friends approve the replacement.\n/// @author Stefan George - \ncontract SocialRecoveryModule is Module {\n\n string public constant NAME = \"Social Recovery Module\";\n string public constant VERSION = \"0.0.1\";\n bytes4 public constant REPLACE_OWNER_FUNCTION_IDENTIFIER = hex\"e318b52b\";\n\n uint8 public threshold;\n address[] public friends;\n\n // isFriend mapping maps friend's address to friend status.\n mapping (address => bool) public isFriend;\n // isExecuted mapping maps data hash to execution status.\n mapping (bytes32 => bool) public isExecuted;\n // isConfirmed mapping maps data hash to friend's address to confirmation status.\n mapping (bytes32 => mapping (address => bool)) public isConfirmed;\n\n modifier onlyFriend() {\n require(isFriend[msg.sender]);\n _;\n }\n\n /// @dev Setup function sets initial storage of contract.\n /// @param _friends List of friends' addresses.\n /// @param _threshold Required number of friends to confirm replacement.\n function setup(address[] _friends, uint8 _threshold)\n public\n {\n require(_threshold <= _friends.length);\n require(_threshold >= 2);\n setManager();\n // Set allowed friends.\n for (uint256 i = 0; i < _friends.length; i++) {\n address friend = _friends[i];\n require(friend != 0);\n require(!isFriend[friend]);\n isFriend[friend] = true;\n }\n friends = _friends;\n threshold = _threshold;\n }\n\n /// @dev Allows a friend to confirm a Safe transaction.\n /// @param dataHash Safe transaction hash.\n function confirmTransaction(bytes32 dataHash)\n public\n onlyFriend\n {\n require(!isExecuted[dataHash]);\n isConfirmed[dataHash][msg.sender] = true;\n }\n\n /// @dev Returns if Safe transaction is a valid owner replacement transaction.\n /// @param data Encoded owner replacement transaction.\n /// @return Returns if transaction can be executed.\n function recoverAccess(bytes data)\n public\n {\n // Only friends are allowed to execute the replacement.\n require(isFriend[msg.sender]);\n // Validate that transaction is a owner replacement transaction.\n bytes4 functionIdentifier;\n // solium-disable-next-line security/no-inline-assembly\n assembly {\n functionIdentifier := mload(add(data, 0x20))\n }\n require(functionIdentifier == REPLACE_OWNER_FUNCTION_IDENTIFIER);\n bytes32 dataHash = getDataHash(data);\n require(!isExecuted[dataHash]);\n require(isConfirmedByRequiredFriends(dataHash));\n isExecuted[dataHash] = true;\n require(manager.execTransactionFromModule(address(manager), 0, data, Enum.Operation.Call));\n }\n\n /// @dev Returns if Safe transaction is a valid owner replacement transaction.\n /// @param dataHash Data hash.\n /// @return Confirmation status.\n function isConfirmedByRequiredFriends(bytes32 dataHash)\n public\n view\n returns (bool)\n {\n uint256 confirmationCount;\n for (uint256 i = 0; i < friends.length; i++) {\n if (isConfirmed[dataHash][friends[i]])\n confirmationCount++;\n if (confirmationCount == threshold)\n return true;\n }\n return false;\n }\n\n /// @dev Returns hash of data encoding owner replacement.\n /// @param data Data payload.\n /// @return Data hash.\n function getDataHash(bytes data)\n public\n view\n returns (bytes32)\n {\n return keccak256(data);\n }\n}\n", "sourcePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/modules/SocialRecoveryModule.sol", "ast": { "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/modules/SocialRecoveryModule.sol", "exportedSymbols": { "SocialRecoveryModule": [ 2035 ] }, "id": 2036, "nodeType": "SourceUnit", "nodes": [ { "id": 1777, "literals": [ "solidity", "0.4", ".23" ], "nodeType": "PragmaDirective", "src": "0:23:12" }, { "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/Enum.sol", "file": "../Enum.sol", "id": 1778, "nodeType": "ImportDirective", "scope": 2036, "sourceUnit": 7, "src": "24:21:12", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/Module.sol", "file": "../Module.sol", "id": 1779, "nodeType": "ImportDirective", "scope": 2036, "sourceUnit": 622, "src": "46:23:12", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/ModuleManager.sol", "file": "../ModuleManager.sol", "id": 1780, "nodeType": "ImportDirective", "scope": 2036, "sourceUnit": 972, "src": "70:30:12", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/OwnerManager.sol", "file": "../OwnerManager.sol", "id": 1781, "nodeType": "ImportDirective", "scope": 2036, "sourceUnit": 1344, "src": "101:29:12", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 1782, "name": "Module", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 621, "src": "339:6:12", "typeDescriptions": { "typeIdentifier": "t_contract$_Module_$621", "typeString": "contract Module" } }, "id": 1783, "nodeType": "InheritanceSpecifier", "src": "339:6:12" } ], "contractDependencies": [ 580, 621, 1359 ], "contractKind": "contract", "documentation": "@title Social Recovery Module - Allows to replace an owner without Safe confirmations if friends approve the replacement.\n @author Stefan George - ", "fullyImplemented": true, "id": 2035, "linearizedBaseContracts": [ 2035, 621, 580, 1359 ], "name": "SocialRecoveryModule", "nodeType": "ContractDefinition", "nodes": [ { "constant": true, "id": 1786, "name": "NAME", "nodeType": "VariableDeclaration", "scope": 2035, "src": "353:54:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory", "typeString": "string" }, "typeName": { "id": 1784, "name": "string", "nodeType": "ElementaryTypeName", "src": "353:6:12", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "536f6369616c205265636f76657279204d6f64756c65", "id": 1785, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "383:24:12", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_8f499aea563eae5544b16c9123d6c7c8537a7d9dd86296aa60c65de194207230", "typeString": "literal_string \"Social Recovery Module\"" }, "value": "Social Recovery Module" }, "visibility": "public" }, { "constant": true, "id": 1789, "name": "VERSION", "nodeType": "VariableDeclaration", "scope": 2035, "src": "413:40:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory", "typeString": "string" }, "typeName": { "id": 1787, "name": "string", "nodeType": "ElementaryTypeName", "src": "413:6:12", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "302e302e31", "id": 1788, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "446:7:12", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_ae209a0b48f21c054280f2455d32cf309387644879d9acbd8ffc199163811885", "typeString": "literal_string \"0.0.1\"" }, "value": "0.0.1" }, "visibility": "public" }, { "constant": true, "id": 1792, "name": "REPLACE_OWNER_FUNCTION_IDENTIFIER", "nodeType": "VariableDeclaration", "scope": 2035, "src": "459:72:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 1790, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "459:6:12", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": { "argumentTypes": null, "hexValue": "e318b52b", "id": 1791, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "518:13:12", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_df42753442dae44b262788763363a184bfb8d0df593d5073d67844ce4b3a2d8b", "typeString": "literal_string (contains invalid UTF-8 sequence at position 2)" }, "value": null }, "visibility": "public" }, { "constant": false, "id": 1794, "name": "threshold", "nodeType": "VariableDeclaration", "scope": 2035, "src": "538:22:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 1793, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "538:5:12", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "public" }, { "constant": false, "id": 1797, "name": "friends", "nodeType": "VariableDeclaration", "scope": 2035, "src": "566:24:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_array$_t_address_$dyn_storage", "typeString": "address[]" }, "typeName": { "baseType": { "id": 1795, "name": "address", "nodeType": "ElementaryTypeName", "src": "566:7:12", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 1796, "length": null, "nodeType": "ArrayTypeName", "src": "566:9:12", "typeDescriptions": { "typeIdentifier": "t_array$_t_address_$dyn_storage_ptr", "typeString": "address[]" } }, "value": null, "visibility": "public" }, { "constant": false, "id": 1801, "name": "isFriend", "nodeType": "VariableDeclaration", "scope": 2035, "src": "661:41:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_bool_$", "typeString": "mapping(address => bool)" }, "typeName": { "id": 1800, 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