{ "contractName": "ValueswapV2ERC20", "abi": [ { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "constant": true, "inputs": [], "name": "DOMAIN_SEPARATOR", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "PERMIT_TYPEHASH", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "address", "name": "", "type": "address" }, { "internalType": "address", "name": "", "type": "address" } ], "name": "allowance", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "address", "name": "", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "decimals", "outputs": [ { "internalType": "uint8", "name": "", "type": "uint8" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "name", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "address", "name": "", "type": "address" } ], "name": "nonces", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "symbol", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "approve", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "transfer", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "value", "type": "uint256" }, { "internalType": "uint256", "name": "deadline", "type": "uint256" }, { "internalType": "uint8", "name": "v", "type": "uint8" }, { "internalType": "bytes32", "name": "r", "type": "bytes32" }, { "internalType": "bytes32", "name": "s", "type": "bytes32" } ], "name": "permit", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "metadata": 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"source": "pragma solidity =0.5.16;\n\nimport './interfaces/IValueswapV2ERC20.sol';\nimport './libraries/SafeMath.sol';\n\ncontract ValueswapV2ERC20 is IValueswapV2ERC20 {\n using SafeMath for uint;\n\n string public constant name = 'Valueswap V2';\n string public constant symbol = 'VNTW-V2';\n uint8 public constant decimals = 18;\n uint public totalSupply;\n mapping(address => uint) public balanceOf;\n mapping(address => mapping(address => uint)) public allowance;\n\n bytes32 public DOMAIN_SEPARATOR;\n // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n mapping(address => uint) public nonces;\n\n event Approval(address indexed owner, address indexed spender, uint value);\n event Transfer(address indexed from, address indexed to, uint value);\n\n constructor() public {\n uint chainId;\n assembly {\n chainId := chainid\n }\n DOMAIN_SEPARATOR = keccak256(\n abi.encode(\n keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),\n keccak256(bytes(name)),\n keccak256(bytes('1')),\n chainId,\n address(this)\n )\n );\n }\n\n function _mint(address to, uint value) internal {\n totalSupply = totalSupply.add(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(address(0), to, value);\n }\n\n function _burn(address from, uint value) internal {\n balanceOf[from] = balanceOf[from].sub(value);\n totalSupply = totalSupply.sub(value);\n emit Transfer(from, address(0), value);\n }\n\n function _approve(address owner, address spender, uint value) private {\n allowance[owner][spender] = value;\n emit Approval(owner, spender, value);\n }\n\n function _transfer(address from, address to, uint value) private {\n balanceOf[from] = balanceOf[from].sub(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(from, to, value);\n }\n\n function approve(address spender, uint value) external returns (bool) {\n _approve(msg.sender, spender, value);\n return true;\n }\n\n function transfer(address to, uint value) external returns (bool) {\n _transfer(msg.sender, to, value);\n return true;\n }\n\n function transferFrom(address from, address to, uint value) external returns (bool) {\n if (allowance[from][msg.sender] != uint(-1)) {\n allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);\n }\n _transfer(from, to, value);\n return true;\n }\n\n function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {\n require(deadline >= block.timestamp, 'ValueswapV2: EXPIRED');\n bytes32 digest = keccak256(\n abi.encodePacked(\n '\\x19\\x01',\n DOMAIN_SEPARATOR,\n keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))\n )\n );\n address recoveredAddress = ecrecover(digest, v, r, s);\n require(recoveredAddress != address(0) && recoveredAddress == owner, 'ValueswapV2: INVALID_SIGNATURE');\n _approve(owner, spender, value);\n }\n}\n", "sourcePath": "/Users/second/Documents/work/valueswap-v2-core/contracts/ValueswapV2ERC20.sol", "ast": { "absolutePath": "/Users/second/Documents/work/valueswap-v2-core/contracts/ValueswapV2ERC20.sol", "exportedSymbols": { "ValueswapV2ERC20": [ 417 ] }, "id": 418, "nodeType": "SourceUnit", "nodes": [ { "id": 34, "literals": [ "solidity", "=", "0.5", ".16" ], "nodeType": "PragmaDirective", "src": "0:24:1" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-core/contracts/interfaces/IValueswapV2ERC20.sol", "file": "./interfaces/IValueswapV2ERC20.sol", "id": 35, "nodeType": "ImportDirective", "scope": 418, "sourceUnit": 1870, "src": "26:44:1", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/Users/second/Documents/work/valueswap-v2-core/contracts/libraries/SafeMath.sol", "file": "./libraries/SafeMath.sol", "id": 36, "nodeType": "ImportDirective", "scope": 418, "sourceUnit": 2326, "src": "71:34:1", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 37, "name": "IValueswapV2ERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1869, "src": "136:17:1", "typeDescriptions": { "typeIdentifier": "t_contract$_IValueswapV2ERC20_$1869", "typeString": "contract IValueswapV2ERC20" } }, "id": 38, "nodeType": "InheritanceSpecifier", "src": "136:17:1" } ], "contractDependencies": [ 1869 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 417, "linearizedBaseContracts": [ 417, 1869 ], "name": "ValueswapV2ERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 41, "libraryName": { "contractScope": null, "id": 39, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2325, "src": "166:8:1", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2325", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "160:24:1", "typeName": { "id": 40, "name": "uint", "nodeType": "ElementaryTypeName", "src": "179:4:1", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "constant": true, "id": 44, "name": "name", "nodeType": "VariableDeclaration", "scope": 417, "src": "190:44:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory", "typeString": "string" }, "typeName": { "id": 42, "name": "string", "nodeType": "ElementaryTypeName", "src": "190:6:1", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "56616c756573776170205632", "id": 43, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "220:14:1", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_19c4a77517fd66407a36fee63f0eb3eeb401145d45beaea91c8c60744e13ddc5", "typeString": "literal_string \"Valueswap V2\"" }, "value": "Valueswap V2" }, "visibility": "public" }, { "constant": true, "id": 47, "name": "symbol", "nodeType": "VariableDeclaration", "scope": 417, "src": "240:41:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory", "typeString": "string" }, "typeName": { "id": 45, "name": "string", "nodeType": "ElementaryTypeName", "src": "240:6:1", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "564e54572d5632", "id": 46, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "272:9:1", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_6282635545c4ba696002dba654c0f0e536eab4b8629372eaad9e29c25b0e9be1", "typeString": "literal_string \"VNTW-V2\"" }, "value": "VNTW-V2" }, "visibility": "public" }, { "constant": true, "id": 50, "name": "decimals", "nodeType": "VariableDeclaration", "scope": 417, "src": "287:35:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 48, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "287:5:1", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": { "argumentTypes": null, "hexValue": "3138", "id": 49, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "320:2:1", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_18_by_1", "typeString": "int_const 18" }, "value": "18" }, "visibility": "public" }, { "constant": false, "id": 52, "name": "totalSupply", "nodeType": "VariableDeclaration", "scope": 417, "src": "328:24:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 51, "name": "uint", "nodeType": "ElementaryTypeName", "src": "328:4:1", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "public" }, { "constant": false, "id": 56, "name": "balanceOf", "nodeType": "VariableDeclaration", "scope": 417, "src": "358:41:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "typeName": { "id": 55, "keyType": { "id": 53, "name": "address", "nodeType": "ElementaryTypeName", "src": "366:7:1", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "358:24:1", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 54, "name": "uint", "nodeType": "ElementaryTypeName", "src": "377:4:1", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "value": null, "visibility": "public" }, { "constant": false, "id": 62, "name": "allowance", "nodeType": "VariableDeclaration", "scope": 417, "src": "405:61:1", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "typeName": { "id": 61, "keyType": { "id": 57, "name": "address", "nodeType": "ElementaryTypeName", "src": "413:7:1", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "405:44:1", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "valueType": { "id": 60, "keyType": { "id": 58, "name": "address", "nodeType": 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