{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.5.2+commit.1df8f40c\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\",\"methods\":{},\"title\":\"SafeERC20\"},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"byzantium\",\"libraries\":{},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"openzeppelin-solidity/contracts/math/SafeMath.sol\":{\"keccak256\":\"0xc2a200a877c4a9b2475c246c54ffecc69ffde3e11af83319c63c2dc5458bac80\",\"urls\":[\"bzzr://c8876e2c39b60f155d748d71d715c8f3903fae5a405ac599adcb6ad2f9a583f9\"]},\"openzeppelin-solidity/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x59e7df16169a498cb8837963b2f5461d88e63bd1eb6c7d58b814d76b84ccbe61\",\"urls\":[\"bzzr://e572c9c4e02e37349702451bf3b5dcbbc86a19da5a51695b5b3e1bfe1e7825dc\"]},\"openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol\":{\"keccak256\":\"0x7230c14d692aff375e4931d60ef73ac8a79c28b9e54c200a377b7dc613c81a78\",\"urls\":[\"bzzr://3538d7da02640c67ac909e84d90e799439f3b3195cf0de39fd173dacd5a98311\"]},\"openzeppelin-solidity/contracts/utils/Address.sol\":{\"keccak256\":\"0xea16b9933153c647242ba50b3e494fb133063d49f1fa81823f35a8c28754142e\",\"urls\":[\"bzzr://aa2b2eb534149525e194341c01cadf666668a1b7d679a268d10e23570a7e26b1\"]}},\"version\":1}", "bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a72305820cd7c50f85eb9029a5d2f5c4189c0f197885a44c526ff6f6fe935acab441c9f150029", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a72305820cd7c50f85eb9029a5d2f5c4189c0f197885a44c526ff6f6fe935acab441c9f150029", "sourceMap": "574:2784:21:-;;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": "574:2784:21:-;;;;;;;;", "source": "pragma solidity ^0.5.2;\n\nimport \"./IERC20.sol\";\nimport \"../../math/SafeMath.sol\";\nimport \"../../utils/Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n using SafeMath for uint256;\n using Address for address;\n\n function safeTransfer(IERC20 token, address to, uint256 value) internal {\n callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\n callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n function safeApprove(IERC20 token, address spender, uint256 value) internal {\n // safeApprove should only be called when setting an initial allowance,\n // or when resetting it to zero. To increase and decrease it, use\n // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n require((value == 0) || (token.allowance(address(this), spender) == 0));\n callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n }\n\n function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n uint256 newAllowance = token.allowance(address(this), spender).add(value);\n callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n uint256 newAllowance = token.allowance(address(this), spender).sub(value);\n callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n /**\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n * on the return value: the return value is optional (but if data is returned, it must equal true).\n * @param token The token targeted by the call.\n * @param data The call data (encoded using abi.encode or one of its variants).\n */\n function callOptionalReturn(IERC20 token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves.\n\n // A Solidity high level call has three parts:\n // 1. The target address is checked to verify it contains contract code\n // 2. The call itself is made, and success asserted\n // 3. The return value is decoded, which in turn checks the size of the returned data.\n\n require(address(token).isContract());\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = address(token).call(data);\n require(success);\n\n if (returndata.length > 0) { // Return data is optional\n require(abi.decode(returndata, (bool)));\n }\n }\n}\n", "sourcePath": "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol", "ast": { "absolutePath": "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 3152 ] }, "id": 3153, "nodeType": "SourceUnit", "nodes": [ { "id": 2939, "literals": [ "solidity", "^", "0.5", ".2" ], "nodeType": "PragmaDirective", "src": "0:23:21" }, { "absolutePath": "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 2940, "nodeType": "ImportDirective", "scope": 3153, "sourceUnit": 2938, "src": "25:22:21", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "openzeppelin-solidity/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 2941, "nodeType": "ImportDirective", "scope": 3153, "sourceUnit": 2346, "src": "48:33:21", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "openzeppelin-solidity/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 2942, "nodeType": "ImportDirective", "scope": 3153, "sourceUnit": 3172, "src": "82:33:21", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "@title SafeERC20\n@dev Wrappers around ERC20 operations that throw on failure (when the token\ncontract returns false). Tokens that return no value (and instead revert or\nthrow on failure) are also supported, non-reverting calls are assumed to be\nsuccessful.\nTo use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,\nwhich allows you to call the safe operations as `token.safeTransfer(...)`, etc.", "fullyImplemented": true, "id": 3152, "linearizedBaseContracts": [ 3152 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 2945, "libraryName": { "contractScope": null, "id": 2943, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2345, "src": "604:8:21", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2345", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "598:27:21", "typeName": { "id": 2944, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "617:7:21", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 2948, "libraryName": 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3190 ], "referencedDeclaration": 3189, "src": "3300:7:21", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 3146, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3300:39:21", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3147, "nodeType": "ExpressionStatement", "src": "3300:39:21" } ] } } ] }, "documentation": "@dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\non the return value: the return value is optional (but if data is returned, it must equal true).\n@param token The token targeted by the call.\n@param data The call data (encoded using abi.encode or one of its variants).", "id": 3151, "implemented": true, "kind": "function", "modifiers": [], "name": "callOptionalReturn", "nodeType": 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[], "unitAlias": "" }, { "absolutePath": "openzeppelin-solidity/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 2941, "nodeType": "ImportDirective", "scope": 3153, "sourceUnit": 2346, "src": "48:33:21", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "openzeppelin-solidity/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 2942, "nodeType": "ImportDirective", "scope": 3153, "sourceUnit": 3172, "src": "82:33:21", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "@title SafeERC20\n@dev Wrappers around ERC20 operations that throw on failure (when the token\ncontract returns false). Tokens that return no value (and instead revert or\nthrow on failure) are also supported, non-reverting calls are assumed to be\nsuccessful.\nTo use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,\nwhich allows you to call the safe operations as `token.safeTransfer(...)`, etc.", "fullyImplemented": true, "id": 3152, "linearizedBaseContracts": [ 3152 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 2945, "libraryName": { "contractScope": null, "id": 2943, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2345, "src": "604:8:21", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2345", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "598:27:21", "typeName": { "id": 2944, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "617:7:21", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 2948, "libraryName": 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Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.", "methods": {}, "title": "SafeERC20" }, "userdoc": { "methods": {} } }