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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 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