{ "contractName": "PairOpenSumSwap", "abi": [ { "inputs": [ { "internalType": "address", "name": "input", "type": "address" }, { "internalType": "address", "name": "output", "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": "", "type": "address" }, { "internalType": "address", "name": "output", "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/stableswap/IOpenSumSwap.sol\";\nimport \"./ISwappaPairV1.sol\";\n\ncontract PairOpenSumSwap is ISwappaPairV1 {\n\tusing SafeMath for uint;\n\n\tfunction swap(\n\t\taddress input,\n\t\taddress output,\n\t\taddress to,\n\t\tbytes calldata data\n\t) external override {\n\t\taddress swapPoolAddr = parseData(data);\n\t\tuint inputAmount = ERC20(input).balanceOf(address(this));\n\t\trequire(\n\t\t\tERC20(input).approve(swapPoolAddr, inputAmount),\n\t\t\t\"PairOpenSumSwap: approve failed!\");\n\t\tuint outputAmount = IOpenSumSwap(swapPoolAddr).swap(\n\t\t\tinput,\n\t\t\toutput,\n\t\t\tinputAmount,\n\t\t\tinputAmount,\n\t\t\tblock.timestamp);\n\t\trequire(\n\t\t\tERC20(output).transfer(to, outputAmount),\n\t\t\t\"PairOpenSumSwap: transfer failed!\");\n\t}\n\n\tfunction parseData(bytes memory data) private pure returns (address swapPoolAddr) {\n\t\trequire(data.length == 20, \"PairOpenSumSwap: invalid data!\");\n\t\tassembly {\n\t\t\tswapPoolAddr := mload(add(data, 20))\n\t\t}\n\t}\n\n\tfunction getOutputAmount(\n\t\taddress,\n\t\taddress output,\n\t\tuint amountIn,\n\t\tbytes calldata data\n\t) external override returns (uint amountOut) {\n\t\tIOpenSumSwap pool = IOpenSumSwap(parseData(data));\n\t\t// no fees are taken if there's enough output token\n\t\tif (!pool.paused() && ERC20(output).balanceOf(address(pool)) >= amountIn) {\n\t\t\tamountOut = amountIn;\n\t\t}\n\t}\n}\n", "sourcePath": "/home/thezviad_gmail_com/src/swappa/contracts/swappa/PairOpenSumSwap.sol", "ast": { "absolutePath": "project:/contracts/swappa/PairOpenSumSwap.sol", "exportedSymbols": { "PairOpenSumSwap": [ 6406 ] }, "id": 6407, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 6267, "literals": [ "solidity", "0.6", ".8" ], "nodeType": "PragmaDirective", "src": "32:22:52" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "@openzeppelin/contracts/math/SafeMath.sol", "id": 6268, "nodeType": "ImportDirective", "scope": 6407, "sourceUnit": 219, "src": "56:51:52", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "id": 6269, "nodeType": "ImportDirective", "scope": 6407, "sourceUnit": 726, "src": "108:55:52", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/interfaces/stableswap/IOpenSumSwap.sol", "file": "../interfaces/stableswap/IOpenSumSwap.sol", "id": 6270, "nodeType": "ImportDirective", "scope": 6407, "sourceUnit": 1810, "src": "164:51:52", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/swappa/ISwappaPairV1.sol", "file": "./ISwappaPairV1.sol", "id": 6271, "nodeType": "ImportDirective", "scope": 6407, "sourceUnit": 5326, "src": "216:29:52", "symbolAliases": [], 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