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"typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "id": 21749, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21683, "src": "1610:5:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "1600:15:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 21753, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 21751, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21738, "src": "1619:9:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "id": 21752, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21683, "src": "1631:5:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "1619:17:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "1600:36:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 21763, "nodeType": "IfStatement", "src": "1596:157:23", "trueBody": { "id": 21762, "nodeType": "Block", "src": "1638:115:23", "statements": [ { "eventCall": { "arguments": [ { "id": 21756, "name": "balance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21731, "src": "1697:7:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 21757, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21738, "src": "1706:9:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": 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"nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21681, "src": "2048:2:23", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 21778, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21683, "src": "2069:5:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_599290589_by_1", "typeString": "int_const 599290589" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 21773, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "1956:3:23", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 21774, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "1956:22:23", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 21779, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1956:119:23", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "expression": { "arguments": [ { "id": 21770, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21677, "src": "1931:5:23", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$15820", "typeString": "contract IERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$15820", "typeString": "contract IERC20" } ], "id": 21769, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1923:7:23", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 21768, "name": "address", "nodeType": "ElementaryTypeName", "src": "1923:7:23", "typeDescriptions": {} } }, "id": 21771, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1923:14:23", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 21772, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "call", "nodeType": "MemberAccess", "src": "1923:19:23", "typeDescriptions": { "typeIdentifier": "t_function_barecall_payable$_t_bytes_memory_ptr_$returns$_t_bool_$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) payable returns (bool,bytes memory)" } }, "id": 21780, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1923:153:23", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$_t_bool_$_t_bytes_memory_ptr_$", "typeString": "tuple(bool,bytes memory)" } }, "nodeType": "VariableDeclarationStatement", "src": "1883:193:23" }, { "expression": { "id": 21806, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 21782, "name": "success", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21686, "src": "2087:7:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { 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false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2149:1:23", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "2134:16:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "2113:37:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "components": [ { "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 21801, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 21793, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "expression": { "id": 21790, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21767, "src": "2168:4:23", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 21791, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "src": "2168:11:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "hexValue": "3332", "id": 21792, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2183:2:23", "typeDescriptions": { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" }, "value": "32" }, "src": "2168:17:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "&&", "rightExpression": { "arguments": [ { "id": 21796, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21767, "src": "2200:4:23", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "components": [ { "id": 21798, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2207:4:23", "typeDescriptions": { "typeIdentifier": "t_type$_t_bool_$", "typeString": "type(bool)" }, "typeName": { "id": 21797, "name": "bool", "nodeType": "ElementaryTypeName", "src": "2207:4:23", "typeDescriptions": {} } } ], "id": 21799, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2206:6:23", "typeDescriptions": { "typeIdentifier": "t_type$_t_bool_$", "typeString": "type(bool)" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_type$_t_bool_$", "typeString": 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false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2167:47:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "2113:101:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 21804, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2112:103:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "2097:118:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "2087:128:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 21807, "nodeType": "ExpressionStatement", "src": "2087:128:23" }, { "condition": { "id": 21809, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "2230:8:23", "subExpression": { "id": 21808, "name": "success", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21686, "src": "2231:7:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 21818, "nodeType": "IfStatement", "src": "2226:103:23", "trueBody": { "id": 21817, "nodeType": "Block", "src": "2240:89:23", "statements": [ { "eventCall": { "arguments": [ { "id": 21811, "name": "callSuccess", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21765, "src": "2287:11:23", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "expression": { "id": 21812, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21767, "src": "2300:4:23", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 21813, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "src": "2300:11:23", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 21814, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21767, "src": "2313:4:23", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 21810, "name": "LogTransferHelperCallFailed", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 21674, "src": "2259:27:23", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_bool_$_t_uint256_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (bool,uint256,bytes memory)" } }, "id": 21815, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2259:59:23", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 21816, "nodeType": "EmitStatement", "src": "2254:64:23" } ] } } ] }, "id": 21820, "implemented": true, "kind": "function", "modifiers": [], "name": "unifiedTransferFrom", "nameLocation": "922:19:23", "nodeType": "FunctionDefinition", "parameters": { "id": 21684, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 21677, "mutability": "mutable", "name": "token", "nameLocation": "958:5:23", "nodeType": "VariableDeclaration", "scope": 21820, "src": "951:12:23", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$15820", "typeString": "contract IERC20" }, "typeName": { "id": 21676, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 21675, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 15820, "src": "951:6:23" }, "referencedDeclaration": 15820, "src": "951:6:23", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$15820", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 21679, "mutability": "mutable", "name": "from", "nameLocation": "981:4:23", "nodeType": "VariableDeclaration", "scope": 21820, "src": "973:12:23", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 21678, "name": "address", "nodeType": "ElementaryTypeName", "src": "973:7:23", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 21681, "mutability": "mutable", "name": "to", "nameLocation": "1003:2:23", "nodeType": "VariableDeclaration", 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], "op": "REVERT", "path": "23" } }, "sha1": "ab55e52ea80afe522c3bd9f6cafb7331669798fc", "source": "// SPDX-License-Identifier: Apache-2.0\npragma solidity 0.8.2;\n\nimport \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\n\n// inspired/informed by\n// https://soliditydeveloper.com/safe-erc20\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/token/ERC20/ERC20.sol\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/token/ERC20/utils/SafeERC20.sol\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/utils/Address.sol\n// https://github.com/Uniswap/solidity-lib/blob/master/contracts/libraries/TransferHelper.sol\nlibrary TransferHelper {\n\n event LogTransferHelperInputValidation1Failed(bool tokenIsContract, address from, address to);\n event LogTransferHelperInputValidation2Failed(uint256 balance, uint256 allowance);\n event LogTransferHelperCallFailed(bool callSuccess, uint256 returnDataLength, bytes returnData);\n\n function unifiedTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n )\n internal\n returns(bool success)\n {\n // input validation step 1\n address tokenAddress = address(token);\n bool tokenIsContract = (tokenAddress.code.length > 0);\n if (from == address(0) || to == address (0) || !tokenIsContract) {\n emit LogTransferHelperInputValidation1Failed(tokenIsContract, from, to);\n return false;\n }\n \n // input validation step 2\n uint256 balance = token.balanceOf(from);\n uint256 allowance = token.allowance(from, address(this));\n if (balance < value || allowance < value) {\n emit LogTransferHelperInputValidation2Failed(balance, allowance);\n return false;\n }\n\n // low-level call to transferFrom\n // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));\n (bool callSuccess, bytes memory data) = address(token).call(\n abi.encodeWithSelector(\n 0x23b872dd, \n from, \n to, \n value));\n\n success = callSuccess && (false\n || data.length == 0 \n || (data.length == 32 && abi.decode(data, (bool))));\n\n if (!success) {\n emit LogTransferHelperCallFailed(callSuccess, data.length, data);\n }\n }\n}", "sourceMap": "595:1742:23:-:0;;;;;;;;;;;;;;;-1:-1:-1;;;595:1742:23;;;;;;;;;;;;;;;;;", "sourcePath": "/home/vscode/.brownie/packages/etherisc/gif-contracts@b58fd27/contracts/shared/TransferHelper.sol", "type": "library" }