{ "contractName": "PairCurve", "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": "input", "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": "{\"compiler\":{\"version\":\"0.6.8+commit.0bbfe453\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"input\",\"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\"},{\"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\"}],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"project:/contracts/swappa/PairCurve.sol\":\"PairCurve\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":10000},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/GSN/Context.sol\":{\"keccak256\":\"0xdb26cbf4d028490f49831a7865c2fe1b28db44b535ca8d343785a3b768aae183\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://840b14ce0315c47d49ba328f1f9fa7654ded1c9e1559e6c5e777a7b2dc28bf0a\",\"dweb:/ipfs/QmTLLabn4wcfGro9LEmUXUN2nwKqZSotXMvjDCLXEnLtZP\"]},\"@openzeppelin/contracts/math/SafeMath.sol\":{\"keccak256\":\"0x9a9cf02622cd7a64261b10534fc3260449da25c98c9e96d1b4ae8110a20e5806\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://2df142592d1dc267d9549049ee3317fa190d2f87eaa565f86ab05ec83f7ab8f5\",\"dweb:/ipfs/QmSkJtcfWo7c42KnL5hho6GFxK6HRNV91XABx1P7xDtfLV\"]},\"@openzeppelin/contracts/token/ERC20/ERC20.sol\":{\"keccak256\":\"0x91e0bd6a6762d2a1700dab0849de8422611355100576c4beef1e80d82a4104a0\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://73bbd77af0a8b07255d2ffa20728bcf13b116007c9ddac5d37046cfabb0e1e02\",\"dweb:/ipfs/QmRgZgWCWCSMTTaok6o4QvWA6MgB4goS8qpb3sN7bAvaZ9\"]},\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x5c26b39d26f7ed489e555d955dcd3e01872972e71fdd1528e93ec164e4f23385\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://efdc632af6960cf865dbc113665ea1f5b90eab75cc40ec062b2f6ae6da582017\",\"dweb:/ipfs/QmfAZFDuG62vxmAN9DnXApv7e7PMzPqi4RkqqZHLMSQiY5\"]},\"@openzeppelin/contracts/utils/Address.sol\":{\"keccak256\":\"0xf5fa8cbdffa5ef8be49b246b5628facc30b71707e78a45d80d93b64eff3fe390\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://774e78a9ff32792cc95db4d2ceaf3a7965bb7f0bea5e6cb7cff182b450d44b37\",\"dweb:/ipfs/QmRRMC4uj7eAcLW7chynA3sNEYULMFazdLwQHKHQPyzAbA\"]},\"project:/contracts/interfaces/curve/ICurve.sol\":{\"keccak256\":\"0x9e3eb4830baa051648e505de0eb31b517f84c10109a13285f219bafbbce4425a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://1c88db4a8b700a4de178805cebb9a23b8c2bfbaaac932c943cb9a205a1440602\",\"dweb:/ipfs/QmdpAhgyaRxbmog5QtFpRKUTccFseRrryTrff7qWAjjQhY\"]},\"project:/contracts/swappa/ISwappaPairV1.sol\":{\"keccak256\":\"0x3ad68981bda91ed83c5e9ee8617f08bb5e208208477fb755cc77077f127010ab\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://8e4390b1bebc39f58bff34b9099a646ead67cef27b722ef61548487251cca719\",\"dweb:/ipfs/QmRWEuYyjHaS957VKWtTfDpzfqkXb2bvEsS33meAC76ZuU\"]},\"project:/contracts/swappa/PairCurve.sol\":{\"keccak256\":\"0x16dffe7193c9052c461cdca6725de457919659a0b838f59033e61b2f53f5fb1d\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://6d17bd302e9932eed98e7dd2c40b84a70d53790868dbe226d5a1027313900616\",\"dweb:/ipfs/Qmd1YFDUnvLuRkqYW4tw7fMCWYbMcuBJ98cEYqzvdCHYau\"]}},\"version\":1}", 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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/curve/ICurve.sol\";\nimport \"./ISwappaPairV1.sol\";\n\ncontract PairCurve is ISwappaPairV1 {\n\tusing SafeMath for uint256;\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\tuint256 inputAmount = ERC20(input).balanceOf(address(this));\n\t\trequire(\n\t\t\tERC20(input).approve(swapPoolAddr, inputAmount),\n\t\t\t\"PairCurve: approve failed!\"\n\t\t);\n\t\tICurve swapPool = ICurve(swapPoolAddr);\n\t\t(int128 fromIdx, int128 toIdx) = getInputOutputIdx(\n\t\t\tswapPool,\n\t\t\tinput,\n\t\t\toutput\n\t\t);\n\t\tuint256 outputAmount = swapPool.exchange(\n\t\t\tfromIdx,\n\t\t\ttoIdx,\n\t\t\tinputAmount,\n\t\t\t0\n\t\t);\n\t\trequire(\n\t\t\tERC20(output).transfer(to, outputAmount),\n\t\t\t\"PairCurve: transfer failed!\"\n\t\t);\n\t}\n\n\tfunction parseData(bytes memory data)\n\t\tprivate\n\t\tpure\n\t\treturns (address swapPoolAddr)\n\t{\n\t\trequire(data.length == 20, \"PairCurve: 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 input,\n\t\taddress output,\n\t\tuint256 amountIn,\n\t\tbytes calldata data\n\t) external override returns (uint256 amountOut) {\n\t\taddress swapPoolAddr = parseData(data);\n\t\tICurve swapPool = ICurve(swapPoolAddr);\n\t\t(int128 fromIdx, int128 toIdx) = getInputOutputIdx(\n\t\t\tswapPool,\n\t\t\tinput,\n\t\t\toutput\n\t\t);\n\t\treturn swapPool.get_dy(fromIdx, toIdx, amountIn);\n\t}\n\n function getInputOutputIdx(\n ICurve swapPool,\n address input,\n address output\n ) private view returns (int128 fromIdx, int128 toIdx) {\n uint8 idx;\n fromIdx = toIdx = -1;\n // curve pool contain at most 4 coins\n for (idx = 0; idx < 4; idx++) {\n if (fromIdx != -1 && toIdx != -1) {\n // found coin indices\n break;\n }\n address coin = swapPool.coins(idx);\n if (coin == input) {\n fromIdx = idx;\n }\n if (coin == output) {\n toIdx = idx;\n }\n }\n }\n}\n", "sourcePath": "/home/thezviad_gmail_com/src/swappa/contracts/swappa/PairCurve.sol", "ast": { "absolutePath": "project:/contracts/swappa/PairCurve.sol", "exportedSymbols": { "PairCurve": [ 6085 ] }, "id": 6086, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 5862, "literals": [ "solidity", "^", "0.6", ".8" ], "nodeType": "PragmaDirective", "src": "32:23:50" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "@openzeppelin/contracts/math/SafeMath.sol", "id": 5863, "nodeType": "ImportDirective", "scope": 6086, "sourceUnit": 219, "src": "57:51:50", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "file": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "id": 5864, "nodeType": "ImportDirective", "scope": 6086, "sourceUnit": 726, "src": "109:55:50", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/interfaces/curve/ICurve.sol", "file": "../interfaces/curve/ICurve.sol", "id": 5865, "nodeType": "ImportDirective", "scope": 6086, "sourceUnit": 1545, "src": "165:40:50", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "project:/contracts/swappa/ISwappaPairV1.sol", "file": "./ISwappaPairV1.sol", "id": 5866, "nodeType": "ImportDirective", "scope": 6086, "sourceUnit": 5326, "src": "206:29:50", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 5867, "name": "ISwappaPairV1", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5325, "src": "259:13:50", "typeDescriptions": { "typeIdentifier": "t_contract$_ISwappaPairV1_$5325", "typeString": "contract ISwappaPairV1" } }, "id": 5868, "nodeType": "InheritanceSpecifier", "src": "259:13:50" } ], "contractDependencies": [ 5325 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 6085, "linearizedBaseContracts": [ 6085, 5325 ], "name": "PairCurve", "nodeType": "ContractDefinition", "nodes": [ { "id": 5871, "libraryName": { "contractScope": null, "id": 5869, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 218, "src": "282:8:50", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$218", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "276:27:50", "typeName": { "id": 5870, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "295:7:50", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "baseFunctions": [ 5311 ], "body": { "id": 5949, "nodeType": "Block", "src": "413:529:50", "statements": [ { "assignments": [ 5884 ], "declarations": [ { "constant": false, "id": 5884, "mutability": "mutable", "name": "swapPoolAddr", "nodeType": "VariableDeclaration", "overrides": null, "scope": 5949, "src": "417:20:50", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5883, "name": "address", "nodeType": "ElementaryTypeName", "src": "417:7:50", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "id": 5888, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5886, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5879, "src": "450:4:50", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 5885, "name": "parseData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5967, "src": "440:9:50", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_address_$", "typeString": "function (bytes memory) pure returns (address)" } }, "id": 5887, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "440:15:50", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "417:38:50" }, { "assignments": [ 5890 ], "declarations": [ { "constant": false, "id": 5890, "mutability": "mutable", "name": "inputAmount", "nodeType": "VariableDeclaration", "overrides": null, "scope": 5949, "src": "459:19:50", "stateVariable": false, "storageLocation": 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"typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 5895, "name": "address", "nodeType": "ElementaryTypeName", "src": "504:7:50", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 5898, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "504:13:50", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5892, "name": "input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5873, "src": "487:5:50", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", 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false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "481:37:50", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "459:59:50" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5906, "name": "swapPoolAddr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5884, "src": "555:12:50", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 5907, "name": "inputAmount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5890, "src": "569:11:50", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { 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