{ "contractName": "PairUniswapV2", "abi": [ { "stateMutability": "payable", "type": "receive" }, { "inputs": [ { "internalType": "address", "name": "input", "type": "address" }, { "internalType": "address", "name": "", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "bytes", "name": "data", "type": "bytes" } ], "name": "swap", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "input", "type": "address" }, { "internalType": "address", "name": "", "type": "address" }, { "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "bytes", "name": "data", "type": "bytes" } ], "name": "getOutputAmount", "outputs": [ { "internalType": "uint256", "name": "amountOut", "type": "uint256" } ], "stateMutability": "nonpayable", "type": "function" } ], "metadata": 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"source": "// SPDX-License-Identifier: MIT\npragma solidity 0.6.8;\n\nimport \"@openzeppelin/contracts/math/SafeMath.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\nimport \"../interfaces/uniswap/IUniswapV2Pair.sol\";\nimport \"./ISwappaPairV1.sol\";\n\ncontract PairUniswapV2 is ISwappaPairV1 {\n\tusing SafeMath for uint;\n\n\tfunction swap(\n\t\taddress input,\n\t\taddress,\n\t\taddress to,\n\t\tbytes calldata data\n\t) external override {\n\t\t(address pairAddr, uint feeK) = parseData(data);\n\t\tuint inputAmount = ERC20(input).balanceOf(address(this));\n\t\trequire(\n\t\t\tERC20(input).transfer(pairAddr, inputAmount),\n\t\t\t\"PairUniswapV2: transfer failed!\");\n\t\tIUniswapV2Pair pair = IUniswapV2Pair(pairAddr);\n\t\t(uint reserve0, uint reserve1,) = pair.getReserves();\n\t\tif (pair.token0() == input) {\n\t\t\tuint outputAmount = getAmountOut(inputAmount, reserve0, reserve1, feeK);\n\t\t\tpair.swap(0, outputAmount, to, new bytes(0));\n\t\t} else {\n\t\t\tuint outputAmount = getAmountOut(inputAmount, reserve1, reserve0, feeK);\n\t\t\tpair.swap(outputAmount, 0, to, new bytes(0));\n\t\t}\n\t}\n\n\tfunction parseData(bytes memory data) private pure returns (address pairAddr, uint fee) {\n\t\trequire(data.length == 21, \"PairUniswapV2: invalid data!\");\n\t\t// fee in bips\n\t\tfee = uint(10000).sub(uint8(data[20]));\n\t\tassembly {\n\t\tpairAddr := mload(add(data, 20))\n\t\t}\n\t}\n\n\tfunction getOutputAmount(\n\t\taddress input,\n\t\taddress,\n\t\tuint amountIn,\n\t\tbytes calldata data\n\t) external override returns (uint amountOut) {\n\t\t(address pairAddr, uint feeK) = parseData(data);\n\t\tIUniswapV2Pair pair = IUniswapV2Pair(pairAddr);\n\t\t(uint reserve0, uint reserve1,) = pair.getReserves();\n\t\t(uint reserveIn, uint reserveOut) = pair.token0() == input ? (reserve0, reserve1) : (reserve1, reserve0);\n\t\treturn getAmountOut(amountIn, reserveIn, reserveOut, feeK);\n\t}\n\n\tfunction getAmountOut(uint amountIn, uint reserveIn, uint reserveOut, uint feeK) internal pure returns (uint amountOut) {\n\t\tuint amountInWithFee = amountIn.mul(feeK);\n\t\tuint numerator = amountInWithFee.mul(reserveOut);\n\t\tuint denominator = reserveIn.mul(10000).add(amountInWithFee);\n\t\tamountOut = numerator / denominator;\n \t}\n\n\treceive() external payable {}\n}\n", "sourcePath": "/home/thezviad_gmail_com/src/swappa/contracts/swappa/PairUniswapV2.sol", "ast": { "absolutePath": "project:/contracts/swappa/PairUniswapV2.sol", "exportedSymbols": { "PairUniswapV2": [ 7292 ] }, "id": 7293, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 7031, "literals": [ "solidity", "0.6", ".8" ], "nodeType": "PragmaDirective", "src": "32:22:57" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "@openzeppelin/contracts/math/SafeMath.sol", "id": 7032, "nodeType": "ImportDirective", "scope": 7293, "sourceUnit": 219, "src": "56:51:57", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "id": 7033, "nodeType": "ImportDirective", "scope": 7293, "sourceUnit": 726, "src": "108:55:57", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/interfaces/uniswap/IUniswapV2Pair.sol", "file": "../interfaces/uniswap/IUniswapV2Pair.sol", "id": 7034, "nodeType": "ImportDirective", "scope": 7293, "sourceUnit": 2706, "src": "164:50:57", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/swappa/ISwappaPairV1.sol", "file": "./ISwappaPairV1.sol", "id": 7035, "nodeType": "ImportDirective", "scope": 7293, "sourceUnit": 5326, "src": "215:29:57", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 7036, "name": "ISwappaPairV1", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5325, "src": "272:13:57", "typeDescriptions": { "typeIdentifier": "t_contract$_ISwappaPairV1_$5325", "typeString": "contract ISwappaPairV1" } }, "id": 7037, "nodeType": "InheritanceSpecifier", "src": "272:13:57" } ], "contractDependencies": [ 5325 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 7292, "linearizedBaseContracts": [ 7292, 5325 ], "name": "PairUniswapV2", "nodeType": "ContractDefinition", "nodes": [ { "id": 7040, "libraryName": { "contractScope": null, "id": 7038, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 218, "src": "295:8:57", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$218", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "289:24:57", "typeName": { "id": 7039, "name": "uint", "nodeType": "ElementaryTypeName", "src": "308:4:57", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "baseFunctions": [ 5311 ], "body": { "id": 7147, "nodeType": "Block", "src": "416:617:57", "statements": [ { "assignments": [ 7053, 7055 ], "declarations": [ { "constant": false, "id": 7053, "mutability": "mutable", "name": "pairAddr", "nodeType": "VariableDeclaration", "overrides": null, "scope": 7147, "src": "421:16:57", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 7052, "name": "address", "nodeType": "ElementaryTypeName", "src": "421:7:57", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 7055, "mutability": "mutable", "name": "feeK", "nodeType": "VariableDeclaration", "overrides": null, "scope": 7147, "src": "439:9:57", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 7054, "name": "uint", "nodeType": "ElementaryTypeName", "src": "439:4:57", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 7059, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 7057, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 7048, "src": "462:4:57", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 7056, "name": "parseData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 7182, "src": "452:9:57", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_address_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (address,uint256)" } }, "id": 7058, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "452:15:57", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$_t_address_$_t_uint256_$", "typeString": "tuple(address,uint256)" } }, "nodeType": "VariableDeclarationStatement", "src": "420:47:57" }, { "assignments": [ 7061 ], "declarations": [ { "constant": false, "id": 7061, "mutability": "mutable", "name": "inputAmount", "nodeType": "VariableDeclaration", "overrides": null, "scope": 7147, "src": "471:16:57", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 7060, "name": "uint", "nodeType": "ElementaryTypeName", "src": "471:4:57", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 7071, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 7068, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "521:4:57", "typeDescriptions": { "typeIdentifier": "t_contract$_PairUniswapV2_$7292", "typeString": "contract PairUniswapV2" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_PairUniswapV2_$7292", "typeString": "contract PairUniswapV2" } ], "id": 7067, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "513:7:57", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 7066, "name": "address", "nodeType": "ElementaryTypeName", "src": "513:7:57", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 7069, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "513:13:57", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 7063, "name": "input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 7042, "src": "496:5:57", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 7062, "name": "ERC20", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 725, 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