{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.5.4+commit.9549d8ff\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"@daostack/arc/contracts/libs/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"byzantium\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@daostack/arc/contracts/libs/SafeERC20.sol\":{\"keccak256\":\"0xf6727d432f67046145b078f40c1cc4f6be7b0d12a6678ecaf457edf7550d244c\",\"urls\":[\"bzzr://cd706a2dc7540d093b591a280b464256c596ddad598b68886e6db2e7958f9916\"]},\"openzeppelin-solidity/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x079c4e23ee448f529e43bfa3c4e8fb4be52cd0318ee923a276835bedf45b93d8\",\"urls\":[\"bzzr://48248e86f64407a95f241d6c5c8cfea6b4d4ebf4ebb467e5c98c8af3868fafe4\"]},\"openzeppelin-solidity/contracts/utils/Address.sol\":{\"keccak256\":\"0x5c731061b804fa256fc8c05150eafe5d20b6bb94541a8f187912bf84f7033f34\",\"urls\":[\"bzzr://63fc4af0d7a99a770925b96a6cf48f25fc00d30274266f82db05f30baa238267\"]}},\"version\":1}", "bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a723058208a680bd431902a61b641c479e843f6f416fc94d4f7dbf37c3c6c20172866f34a0029", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a723058208a680bd431902a61b641c479e843f6f416fc94d4f7dbf37c3c6c20172866f34a0029", "sourceMap": "613:2351:47:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24", "deployedSourceMap": "613:2351:47:-;;;;;;;;", "source": "/*\n\nSafeERC20 by daostack.\nThe code is based on a fix by SECBIT Team.\n\nUSE WITH CAUTION & NO WARRANTY\n\nREFERENCE & RELATED READING\n- https://github.com/ethereum/solidity/issues/4116\n- https://medium.com/@chris_77367/explaining-unexpected-reverts-starting-with-solidity-0-4-22-3ada6e82308c\n- https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca\n- https://gist.github.com/BrendanChou/88a2eeb80947ff00bcf58ffdafeaeb61\n\n*/\npragma solidity ^0.5.4;\n\nimport \"openzeppelin-solidity/contracts/utils/Address.sol\";\nimport \"openzeppelin-solidity/contracts/token/ERC20/IERC20.sol\";\n\nlibrary SafeERC20 {\n using Address for address;\n\n bytes4 constant private TRANSFER_SELECTOR = bytes4(keccak256(bytes(\"transfer(address,uint256)\")));\n bytes4 constant private TRANSFERFROM_SELECTOR = bytes4(keccak256(bytes(\"transferFrom(address,address,uint256)\")));\n bytes4 constant private APPROVE_SELECTOR = bytes4(keccak256(bytes(\"approve(address,uint256)\")));\n\n function safeTransfer(address _erc20Addr, address _to, uint256 _value) internal {\n\n // Must be a contract addr first!\n require(_erc20Addr.isContract());\n\n (bool success, bytes memory returnValue) =\n // solhint-disable-next-line avoid-low-level-calls\n _erc20Addr.call(abi.encodeWithSelector(TRANSFER_SELECTOR, _to, _value));\n // call return false when something wrong\n require(success);\n //check return value\n require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));\n }\n\n function safeTransferFrom(address _erc20Addr, address _from, address _to, uint256 _value) internal {\n\n // Must be a contract addr first!\n require(_erc20Addr.isContract());\n\n (bool success, bytes memory returnValue) =\n // solhint-disable-next-line avoid-low-level-calls\n _erc20Addr.call(abi.encodeWithSelector(TRANSFERFROM_SELECTOR, _from, _to, _value));\n // call return false when something wrong\n require(success);\n //check return value\n require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));\n }\n\n function safeApprove(address _erc20Addr, address _spender, uint256 _value) internal {\n\n // Must be a contract addr first!\n require(_erc20Addr.isContract());\n\n // safeApprove should only be called when setting an initial allowance,\n // or when resetting it to zero.\n require((_value == 0) || (IERC20(_erc20Addr).allowance(address(this), _spender) == 0));\n\n (bool success, bytes memory returnValue) =\n // solhint-disable-next-line avoid-low-level-calls\n _erc20Addr.call(abi.encodeWithSelector(APPROVE_SELECTOR, _spender, _value));\n // call return false when something wrong\n require(success);\n //check return value\n require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));\n }\n}\n", "sourcePath": "@daostack/arc/contracts/libs/SafeERC20.sol", "ast": { "absolutePath": "@daostack/arc/contracts/libs/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 9335 ] }, "id": 9336, "nodeType": "SourceUnit", "nodes": [ { "id": 9117, "literals": [ "solidity", "^", "0.5", ".4" ], "nodeType": "PragmaDirective", "src": "462:23:47" }, { "absolutePath": "openzeppelin-solidity/contracts/utils/Address.sol", "file": "openzeppelin-solidity/contracts/utils/Address.sol", "id": 9118, "nodeType": "ImportDirective", "scope": 9336, "sourceUnit": 16768, "src": "487:59:47", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol", "file": "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol", "id": 9119, "nodeType": "ImportDirective", "scope": 9336, "sourceUnit": 16749, "src": "547:64:47", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": null, "fullyImplemented": true, "id": 9335, "linearizedBaseContracts": [ 9335 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 9122, "libraryName": { "contractScope": null, "id": 9120, "name": "Address", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 16767, "src": "643:7:47", "typeDescriptions": { "typeIdentifier": "t_contract$_Address_$16767", "typeString": "library Address" } }, 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"kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "736:27:47", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" }, "value": "transfer(address,uint256)" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" } ], "id": 9126, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "730:5:47", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes_storage_ptr_$", "typeString": "type(bytes storage pointer)" }, "typeName": "bytes" }, "id": 9128, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "730:34:47", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 9125, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16776, "src": "720:9:47", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 9129, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "720:45:47", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 9124, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "713:6:47", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" }, "typeName": "bytes4" }, "id": 9130, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "713:53:47", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "visibility": "private" }, { "constant": true, "id": 9140, "name": "TRANSFERFROM_SELECTOR", "nodeType": "VariableDeclaration", "scope": 9335, "src": "772:113:47", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 9132, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "772:6:47", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "7472616e7366657246726f6d28616464726573732c616464726573732c75696e7432353629", "id": 9136, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "843:39:47", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" }, "value": "transferFrom(address,address,uint256)" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" } ], "id": 9135, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "837:5:47", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes_storage_ptr_$", "typeString": "type(bytes storage pointer)" }, "typeName": "bytes" }, "id": 9137, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "837:46:47", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 9134, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16776, "src": "827:9:47", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 9138, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "827:57:47", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 9133, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "820:6:47", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" }, "typeName": "bytes4" }, "id": 9139, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "820:65:47", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "visibility": "private" }, { "constant": true, "id": 9149, "name": "APPROVE_SELECTOR", "nodeType": "VariableDeclaration", "scope": 9335, "src": "891:95:47", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 9141, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "891:6:47", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "617070726f766528616464726573732c75696e7432353629", "id": 9145, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "957:26:47", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_095ea7b334ae44009aa867bfb386f5c3b4b443ac6f0ee573fa91c4608fbadfba", "typeString": "literal_string \"approve(address,uint256)\"" }, "value": "approve(address,uint256)" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_095ea7b334ae44009aa867bfb386f5c3b4b443ac6f0ee573fa91c4608fbadfba", 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"t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 9147, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "941:44:47", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 9142, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "934:6:47", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" }, "typeName": "bytes4" }, "id": 9148, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "934:52:47", "typeDescriptions": { "typeIdentifier": 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