hardlydifficult-ethereum-contracts

{ "contractName": "ApproveAndCall", "abi": [ { "constant": false, "inputs": [ { "internalType": "address", "name": "_token", "type": "address" }, { "internalType": "uint256", "name": "_amount", "type": "uint256" }, { "internalType": "address", "name": "_contract", "type": "address" }, { "internalType": "bytes", "name": "_callData", "type": "bytes" } ], "name": "approveAndCall", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "metadata": 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step.\"},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/home/circleci/repo/contracts/tokens/ERC20/ApproveAndCall.sol\":\"ApproveAndCall\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":2000000},\"remappings\":[]},\"sources\":{\"/home/circleci/repo/contracts/proxies/CallContract.sol\":{\"keccak256\":\"0x5b891896d85a8937da32acd5af2d4b2d3fd8f5fbae639540d54ed972d05304b4\",\"urls\":[\"bzz-raw://982e6db3cc9a612ab3ecd4a404ed15255429e857ebf0bb96b404dedb83313dc1\",\"dweb:/ipfs/Qmeh7ezyMrD4q62edq1oLdR93NuTr8GYwE4XKE62T125Mt\"]},\"/home/circleci/repo/contracts/tokens/ERC20/ApproveAndCall.sol\":{\"keccak256\":\"0xcb38adf4a5902a0500b1d9f525dcad2bb2db98b4c207122b34db9c7f4dda0ee1\",\"urls\":[\"bzz-raw://9fcdc775615ee13eea82f79c3031c15bf4ebc4864f19ccd5a59d0f2b110aa1cb\",\"dweb:/ipfs/QmWCNB5AoCBSPuryBm9CakKPbMUJQJDp4veoBLDL4PKsmq\"]},\"@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0xe5bb0f57cff3e299f360052ba50f1ea0fff046df2be070b6943e0e3c3fdad8a9\",\"urls\":[\"bzz-raw://59fd025151435da35faa8093a5c7a17de02de9d08ad27275c5cdf05050820d91\",\"dweb:/ipfs/QmQMvwEcPhoRXzbXyrdoeRtvLoifUW9Qh7Luho7bmUPRkc\"]}},\"version\":1}", 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"source": "pragma solidity ^0.5.0;\n\nimport '@openzeppelin/contracts-ethereum-package/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": "/home/circleci/repo/contracts/tokens/ERC20/ApproveAndCall.sol", "exportedSymbols": { "ApproveAndCall": [ 1815 ] }, "id": 1816, "nodeType": "SourceUnit", "nodes": [ { "id": 1745, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:21" }, { "absolutePath": "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol", "file": "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol", "id": 1746, "nodeType": "ImportDirective", "scope": 1816, "sourceUnit": 2180, "src": "25:83:21", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/home/circleci/repo/contracts/proxies/CallContract.sol", "file": "../../proxies/CallContract.sol", "id": 1747, "nodeType": "ImportDirective", "scope": 1816, "sourceUnit": 1330, "src": "109:40:21", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": "@title Approve this contract to spend your ERC-20 tokens, and then\nyou can call various contracts without an additional approval step.", "fullyImplemented": true, "id": 1815, "linearizedBaseContracts": [ 1815 ], "name": "ApproveAndCall", "nodeType": "ContractDefinition", "nodes": [ { "id": 1750, "libraryName": { "contractScope": null, "id": 1748, "name": "CallContract", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1329, "src": "334:12:21", "typeDescriptions": { "typeIdentifier": "t_contract$_CallContract_$1329", "typeString": "library CallContract" } }, "nodeType": "UsingForDirective", "src": "328:31:21", "typeName": { "id": 1749, "name": "address", "nodeType": "ElementaryTypeName", "src": "351:7:21", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "body": { "id": 1813, "nodeType": "Block", "src": "489:534:21", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 1765, "name": "msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2263, "src": "581:3:21", "typeDescriptions": { "typeIdentifier": "t_magic_message", "typeString": "msg" } }, "id": 1766, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sender", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "581:10:21", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1768, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2331, "src": "601:4:21", "typeDescriptions": { "typeIdentifier": "t_contract$_ApproveAndCall_$1815", "typeString": "contract ApproveAndCall" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_ApproveAndCall_$1815", "typeString": "contract ApproveAndCall" } ], "id": 1767, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "593:7:21", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": "address" }, "id": 1769, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "593:13:21", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 1770, "name": "_amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1754, "src": "608:7:21", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { 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"t_contract$_IERC20_$2179", "typeString": "contract IERC20" } }, "id": 1764, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transferFrom", "nodeType": "MemberAccess", "referencedDeclaration": 2162, "src": "553:27:21", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,address,uint256) external returns (bool)" } }, "id": 1771, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "553:63:21", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 1772, "nodeType": "ExpressionStatement", "src": "553:63:21" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1777, "name": "_contract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 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"referencedDeclaration": 2179, "src": "669:6:21", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_IERC20_$2179_$", "typeString": "type(contract IERC20)" } }, "id": 1775, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "669:14:21", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$2179", "typeString": "contract IERC20" } }, "id": 1776, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 2151, "src": "669:22:21", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 1779, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "669:42:21", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 1780, "nodeType": "ExpressionStatement", "src": "669:42:21" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1784, "name": "_callData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1758, "src": "733:9:21", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "hexValue": "30", "id": 1785, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "744:1:21", "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": 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