hardlydifficult-eth

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step.\"},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"project:/contracts/tokens/ERC20/ApproveAndCall.sol\":\"ApproveAndCall\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":2000000},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x5f02220344881ce43204ae4a6281145a67bc52c2bb1290a791857df3d19d78f5\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://24427744bd3e6cb73c17010119af12a318289c0253a4d9acb8576c9fb3797b08\",\"dweb:/ipfs/QmTLDqpKRBuxGxRAmjgXt9AkXyACW3MtKzi7PYjm5iMfGC\"]},\"project:/contracts/proxies/CallContract.sol\":{\"keccak256\":\"0xb30b0e77e31fd3e37b3a2028fb4ebcf7789d4225feb011b921b8a25447a09b68\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://ee3c46722099a245797c4116382ba9fbdc338274d4ed440e97d15ff761611efa\",\"dweb:/ipfs/QmU2Zb2vmGeEjPoa6ZbCVGgjw2ogdnuKQeRCSoiv7SK4ro\"]},\"project:/contracts/tokens/ERC20/ApproveAndCall.sol\":{\"keccak256\":\"0x589ab3b6e81bbe37fb897cea42a81a1c2ed41605bcdd4d23611913820f23c251\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://d3169775f52fa383b75971647c5aaccd71c2632be64515578fac1e39e72663fc\",\"dweb:/ipfs/QmQiqszcdor8aDg7vURP1eeYkA8k2C3T3GBGRidwsQae4G\"]}},\"version\":1}", 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"source": "// SPDX-License-Identifier: MIT\npragma solidity ^0.6.0;\n\nimport '@openzeppelin/contracts/token/ERC20/IERC20.sol';\nimport '../../proxies/CallContract.sol';\n\n/**\n * @title Approve this contract to spend your ERC-20 tokens, and then\n * you can call various contracts without an additional approval step.\n */\ncontract ApproveAndCall\n{\n using CallContract for address;\n\n function approveAndCall(\n address _token,\n uint _amount,\n address _contract,\n bytes memory _callData\n ) public\n {\n // First move tokens from the user into this contract\n IERC20(_token).transferFrom(msg.sender, address(this), _amount);\n\n // Approve spending and call the contract\n IERC20(_token).approve(_contract, _amount);\n _contract._call(_callData, 0);\n\n // Check for any unspent tokens, this is only applicable if the _contract is not predictable\n uint balance = IERC20(_token).balanceOf(address(this));\n if(balance > 0)\n {\n // Refund the remainder\n IERC20(_token).transfer(msg.sender, balance);\n }\n }\n}\n", "sourcePath": "/home/circleci/repo/contracts/tokens/ERC20/ApproveAndCall.sol", "ast": { "absolutePath": "project:/contracts/tokens/ERC20/ApproveAndCall.sol", "exportedSymbols": { "ApproveAndCall": [ 4188 ] }, "id": 4189, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 4115, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "32:23:30" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "id": 4116, "nodeType": "ImportDirective", "scope": 4189, "sourceUnit": 433, "src": "57:56:30", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/proxies/CallContract.sol", "file": "../../proxies/CallContract.sol", "id": 4117, "nodeType": "ImportDirective", "scope": 4189, "sourceUnit": 3731, "src": "114:40:30", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 4118, "nodeType": "StructuredDocumentation", "src": "156:148:30", "text": " @title Approve this contract to spend your ERC-20 tokens, and then\n you can call various contracts without an additional approval step." }, "fullyImplemented": true, "id": 4188, "linearizedBaseContracts": [ 4188 ], "name": "ApproveAndCall", "nodeType": "ContractDefinition", "nodes": [ { "id": 4121, "libraryName": { "contractScope": null, "id": 4119, "name": "CallContract", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3730, "src": "339:12:30", "typeDescriptions": { "typeIdentifier": "t_contract$_CallContract_$3730", "typeString": "library CallContract" } }, "nodeType": "UsingForDirective", "src": "333:31:30", "typeName": { "id": 4120, "name": "address", "nodeType": "ElementaryTypeName", "src": "356:7:30", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "body": { "id": 4186, "nodeType": "Block", "src": "494:534:30", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 4136, "name": "msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -15, "src": "586:3:30", "typeDescriptions": { "typeIdentifier": "t_magic_message", "typeString": "msg" } }, "id": 4137, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sender", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "586:10:30", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4140, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "606:4:30", "typeDescriptions": { "typeIdentifier": "t_contract$_ApproveAndCall_$4188", "typeString": "contract ApproveAndCall" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_ApproveAndCall_$4188", "typeString": "contract ApproveAndCall" } ], "id": 4139, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "598:7:30", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4138, "name": "address", "nodeType": "ElementaryTypeName", "src": "598:7:30", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4141, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "598:13:30", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4142, "name": "_amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4125, "src": "613:7:30", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4133, "name": "_token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4123, "src": "565:6:30", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 4132, "name": "IERC20", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 432, "src": "558:6:30", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_IERC20_$432_$", "typeString": "type(contract IERC20)" } }, "id": 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"nodeType": "ExpressionStatement", "src": "558:63:30" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4149, "name": "_contract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4127, "src": "697:9:30", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4150, "name": "_amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4125, "src": "708:7:30", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4146, "name": "_token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4123, "src": "681:6:30", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 4145, "name": "IERC20", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 432, "src": "674:6:30", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_IERC20_$432_$", "typeString": "type(contract IERC20)" } }, "id": 4147, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "674:14:30", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$432", "typeString": "contract IERC20" } }, "id": 4148, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 401, "src": "674:22:30", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 4151, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "674:42:30", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4152, "nodeType": "ExpressionStatement", "src": "674:42:30" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4156, "name": "_callData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4129, "src": "738:9:30", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "hexValue": "30", "id": 4157, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "749:1:30", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "expression": { "argumentTypes": null, "id": 4153, "name": "_contract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4127, "src": "722:9:30", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 4155, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "_call", "nodeType": "MemberAccess", "referencedDeclaration": 3706, "src": "722:15:30", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$_t_uint256_$returns$__$bound_to$_t_address_$", "typeString": "function (address,bytes memory,uint256)" } }, "id": 4158, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "722:29:30", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4159, "nodeType": "ExpressionStatement", "src": "722:29:30" }, { "assignments": [ 4161 ], "declarations": [ { "constant": false, "id": 4161, "mutability": "mutable", "name": "balance", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4186, "src": "855:12:30", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4160, "name": "uint", "nodeType": "ElementaryTypeName", "src": "855:4:30", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 4171, "initialValue": { "argumentTypes": null, "arguments": [ { 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