{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"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/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol\":{\"keccak256\":\"0x640b6dee7a4b830bdfd52b5031a07fc2b12209f5b2e29e5d364a7d37f69d8076\",\"urls\":[\"bzz-raw://31113152e1ddb78fe7a4197f247591ca894e93f916867beb708d8e747b6cc74f\",\"dweb:/ipfs/QmbZaJyXdpsYGykVhHH9qpVGQg9DGCxE2QufbCUy3daTgq\"]},\"@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0xe5bb0f57cff3e299f360052ba50f1ea0fff046df2be070b6943e0e3c3fdad8a9\",\"urls\":[\"bzz-raw://59fd025151435da35faa8093a5c7a17de02de9d08ad27275c5cdf05050820d91\",\"dweb:/ipfs/QmQMvwEcPhoRXzbXyrdoeRtvLoifUW9Qh7Luho7bmUPRkc\"]},\"@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol\":{\"keccak256\":\"0x6f2c9955d65c522b80f4b8792f076512d2df947d2112cbc4d98a4781ed42ede2\",\"urls\":[\"bzz-raw://7d8ec81683520c06baeef3f7e06cd82bd6fd5fa611f26857f475f6c829540aff\",\"dweb:/ipfs/QmTDkFzKnrpiV1UKnSoiZAHPuguWzokrr4pFbSPvyaSo56\"]},\"@openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol\":{\"keccak256\":\"0x1a8e5072509c5ea7365eb1d48030b9be865140c8fb779968da0a459a0e174a11\",\"urls\":[\"bzz-raw://03335b7b07c7c8c8d613cfdd8ec39a0b5ec133ee510bf2fe6cc5a496767bef4b\",\"dweb:/ipfs/Qmebp4nzPja645c9yXSdJkGq96oU3am3LUnG2K3R7XxyKf\"]}},\"version\":1}", "bytecode": "0x60556023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a72315820d84c69bcf7ef2e4c6898775ff4a32f9bb494e0b9accd531faa81bb504594dd3664736f6c63430005110032", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a72315820d84c69bcf7ef2e4c6898775ff4a32f9bb494e0b9accd531faa81bb504594dd3664736f6c63430005110032", "sourceMap": "574:3189:23:-;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24", "deployedSourceMap": "574:3189:23:-;;;;;;;;", "source": "pragma solidity ^0.5.0;\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 // solhint-disable-next-line max-line-length\n require((value == 0) || (token.allowance(address(this), spender) == 0),\n \"SafeERC20: approve from non-zero to non-zero allowance\"\n );\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, \"SafeERC20: decreased allowance below zero\");\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 not be false).\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 // solhint-disable-next-line max-line-length\n require(address(token).isContract(), \"SafeERC20: call to non-contract\");\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = address(token).call(data);\n require(success, \"SafeERC20: low-level call failed\");\n\n if (returndata.length > 0) { // Return data is optional\n // solhint-disable-next-line max-line-length\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n }\n }\n}\n", "sourcePath": "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol", "ast": { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 6961 ] }, "id": 6962, "nodeType": "SourceUnit", "nodes": [ { "id": 6743, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:23" }, { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 6744, "nodeType": "ImportDirective", "scope": 6962, "sourceUnit": 6742, "src": "25:22:23", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 6745, "nodeType": "ImportDirective", "scope": 6962, "sourceUnit": 6070, "src": "48:33:23", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 6746, "nodeType": "ImportDirective", "scope": 6962, "sourceUnit": 7037, "src": "82:33:23", "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": 6961, "linearizedBaseContracts": [ 6961 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 6749, "libraryName": { "contractScope": null, "id": 6747, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6069, "src": "604:8:23", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$6069", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "598:27:23", "typeName": { "id": 6748, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "617:7:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 6752, "libraryName": 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"absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 6745, "nodeType": "ImportDirective", "scope": 6962, "sourceUnit": 6070, "src": "48:33:23", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 6746, "nodeType": "ImportDirective", "scope": 6962, "sourceUnit": 7037, "src": "82:33:23", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "@title SafeERC20\n@dev Wrappers around ERC20 operations that throw on failure (when the token\ncontract returns false). Tokens that return no value (and instead revert or\nthrow on failure) are also supported, non-reverting calls are assumed to be\nsuccessful.\nTo use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,\nwhich allows you to call the safe operations as `token.safeTransfer(...)`, etc.", "fullyImplemented": true, "id": 6961, "linearizedBaseContracts": [ 6961 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 6749, "libraryName": { "contractScope": null, "id": 6747, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6069, "src": "604:8:23", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$6069", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "598:27:23", "typeName": { "id": 6748, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "617:7:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 6752, "libraryName": 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"typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "2693:33:23" }, "returnParameters": { "id": 6917, "nodeType": "ParameterList", "parameters": [], "src": "2735:0:23" }, "scope": 6961, "src": "2666:1095:23", "stateMutability": "nonpayable", "superFunction": null, "visibility": "private" } ], "scope": 6962, "src": "574:3189:23" } ], "src": "0:3764:23" }, "compiler": { "name": "solc", "version": "0.5.17+commit.d19bba13.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.3.0", "updatedAt": "2020-12-11T05:03:09.363Z", "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": {} } }