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| 1 | +pragma solidity 0.5.11; |
| 2 | + |
| 3 | +import "../../IERC20.sol"; |
| 4 | +import "../../IKyberReserve.sol"; |
| 5 | +import "../../WithdrawableV5.sol"; |
| 6 | +import "../../UtilsV5.sol"; |
| 7 | +import "./mock/IBancorNetwork.sol"; |
| 8 | + |
| 9 | +contract KyberBancorReserve is IKyberReserve, Withdrawable, Utils { |
| 10 | + |
| 11 | + uint constant internal BPS = 10000; // 10^4 |
| 12 | + uint constant ETH_BNT_DECIMALS = 18; |
| 13 | + |
| 14 | + address public kyberNetwork; |
| 15 | + bool public tradeEnabled; |
| 16 | + uint public feeBps; |
| 17 | + |
| 18 | + IBancorNetwork public bancorNetwork; // 0x0e936B11c2e7b601055e58c7E32417187aF4de4a |
| 19 | + |
| 20 | + IERC20 public bancorEth; // 0xc0829421C1d260BD3cB3E0F06cfE2D52db2cE315 |
| 21 | + IERC20 public bancorToken; // 0x1F573D6Fb3F13d689FF844B4cE37794d79a7FF1C |
| 22 | + |
| 23 | + constructor( |
| 24 | + address _bancorNetwork, |
| 25 | + address _kyberNetwork, |
| 26 | + uint _feeBps, |
| 27 | + address _bancorEth, |
| 28 | + address _bancorToken, |
| 29 | + address _admin |
| 30 | + ) |
| 31 | + public |
| 32 | + { |
| 33 | + require(_bancorNetwork != address(0), "constructor: bancorNetwork address is missing"); |
| 34 | + require(_kyberNetwork != address(0), "constructor: kyberNetwork address is missing"); |
| 35 | + require(_bancorEth != address(0), "constructor: bancorEth address is missing"); |
| 36 | + require(_bancorToken != address(0), "constructor: bancorToken address is missing"); |
| 37 | + require(_admin != address(0), "constructor: admin address is missing"); |
| 38 | + require(_feeBps < BPS, "constructor: fee is too big"); |
| 39 | + |
| 40 | + bancorNetwork = IBancorNetwork(_bancorNetwork); |
| 41 | + bancorToken = IERC20(_bancorToken); |
| 42 | + bancorEth = IERC20(_bancorEth); |
| 43 | + |
| 44 | + kyberNetwork = _kyberNetwork; |
| 45 | + feeBps = _feeBps; |
| 46 | + admin = _admin; |
| 47 | + tradeEnabled = true; |
| 48 | + |
| 49 | + require(bancorToken.approve(address(bancorNetwork), 2 ** 255)); |
| 50 | + } |
| 51 | + |
| 52 | + function() external payable { } |
| 53 | + |
| 54 | + function getConversionRate(IERC20 src, IERC20 dest, uint srcQty, uint) public view returns(uint) { |
| 55 | + if (!tradeEnabled) { return 0; } |
| 56 | + if (srcQty == 0) { return 0; } |
| 57 | + |
| 58 | + if (src != ETH_TOKEN_ADDRESS && dest != ETH_TOKEN_ADDRESS) { |
| 59 | + return 0; // either src or dest must be ETH |
| 60 | + } |
| 61 | + IERC20 token = src == ETH_TOKEN_ADDRESS ? dest : src; |
| 62 | + if (token != bancorToken) { return 0; } // not BNT token |
| 63 | + |
| 64 | + IERC20[] memory path = getConversionPath(src, dest); |
| 65 | + |
| 66 | + uint destQty; |
| 67 | + (destQty, ) = bancorNetwork.getReturnByPath(path, srcQty); |
| 68 | + |
| 69 | + // src and dest can be only BNT or ETH |
| 70 | + uint rate = calcRateFromQty(srcQty, destQty, ETH_BNT_DECIMALS, ETH_BNT_DECIMALS); |
| 71 | + |
| 72 | + rate = valueAfterReducingFee(rate); |
| 73 | + |
| 74 | + return rate; |
| 75 | + } |
| 76 | + |
| 77 | + event TradeExecute( |
| 78 | + address indexed sender, |
| 79 | + address src, |
| 80 | + uint srcAmount, |
| 81 | + address destToken, |
| 82 | + uint destAmount, |
| 83 | + address payable destAddress |
| 84 | + ); |
| 85 | + |
| 86 | + function trade( |
| 87 | + IERC20 srcToken, |
| 88 | + uint srcAmount, |
| 89 | + IERC20 destToken, |
| 90 | + address payable destAddress, |
| 91 | + uint conversionRate, |
| 92 | + bool validate |
| 93 | + ) |
| 94 | + public |
| 95 | + payable |
| 96 | + returns(bool) |
| 97 | + { |
| 98 | + |
| 99 | + require(tradeEnabled, "trade: trade is not enabled"); |
| 100 | + require(msg.sender == kyberNetwork, "trade: sender is not network"); |
| 101 | + require(srcAmount > 0, "trade: src amount must be greater than 0"); |
| 102 | + require(srcToken == ETH_TOKEN_ADDRESS || destToken == ETH_TOKEN_ADDRESS, "trade: src or dest must be ETH"); |
| 103 | + require(srcToken == bancorToken || destToken == bancorToken, "trade: src or dest must be BNT"); |
| 104 | + |
| 105 | + require(doTrade(srcToken, srcAmount, destToken, destAddress, conversionRate, validate), "trade: doTrade function returns false"); |
| 106 | + |
| 107 | + return true; |
| 108 | + } |
| 109 | + |
| 110 | + event KyberNetworkSet(address kyberNetwork); |
| 111 | + |
| 112 | + function setKyberNetwork(address _kyberNetwork) public onlyAdmin { |
| 113 | + require(_kyberNetwork != address(0), "setKyberNetwork: kyberNetwork address is missing"); |
| 114 | + |
| 115 | + kyberNetwork = _kyberNetwork; |
| 116 | + emit KyberNetworkSet(_kyberNetwork); |
| 117 | + } |
| 118 | + |
| 119 | + event BancorNetworkSet(address _bancorNetwork); |
| 120 | + |
| 121 | + function setBancorContract(address _bancorNetwork) public onlyAdmin { |
| 122 | + require(_bancorNetwork != address(0), "setBancorContract: bancorNetwork address is missing"); |
| 123 | + |
| 124 | + if (address(bancorNetwork) != address(0)) { |
| 125 | + require(bancorToken.approve(address(bancorNetwork), 0), "setBancorContract: can not reset approve token"); |
| 126 | + } |
| 127 | + bancorNetwork = IBancorNetwork(_bancorNetwork); |
| 128 | + require(bancorToken.approve(address(bancorNetwork), 2 ** 255), "setBancorContract: can not approve token"); |
| 129 | + |
| 130 | + emit BancorNetworkSet(_bancorNetwork); |
| 131 | + } |
| 132 | + |
| 133 | + event FeeBpsSet(uint feeBps); |
| 134 | + |
| 135 | + function setFeeBps(uint _feeBps) public onlyAdmin { |
| 136 | + require(_feeBps < BPS, "setFeeBps: feeBps >= BPS"); |
| 137 | + |
| 138 | + feeBps = _feeBps; |
| 139 | + emit FeeBpsSet(feeBps); |
| 140 | + } |
| 141 | + |
| 142 | + event TradeEnabled(bool enable); |
| 143 | + |
| 144 | + function enableTrade() public onlyAdmin returns(bool) { |
| 145 | + tradeEnabled = true; |
| 146 | + emit TradeEnabled(true); |
| 147 | + |
| 148 | + return true; |
| 149 | + } |
| 150 | + |
| 151 | + function disableTrade() public onlyAlerter returns(bool) { |
| 152 | + tradeEnabled = false; |
| 153 | + emit TradeEnabled(false); |
| 154 | + |
| 155 | + return true; |
| 156 | + } |
| 157 | + |
| 158 | + function doTrade( |
| 159 | + IERC20 srcToken, |
| 160 | + uint srcAmount, |
| 161 | + IERC20 destToken, |
| 162 | + address payable destAddress, |
| 163 | + uint conversionRate, |
| 164 | + bool validate |
| 165 | + ) |
| 166 | + internal |
| 167 | + returns(bool) |
| 168 | + { |
| 169 | + // can skip validation if done at kyber network level |
| 170 | + if (validate) { |
| 171 | + require(conversionRate > 0); |
| 172 | + if (srcToken == ETH_TOKEN_ADDRESS) |
| 173 | + require(msg.value == srcAmount, "doTrade: msg value is not correct for ETH trade"); |
| 174 | + else |
| 175 | + require(msg.value == 0, "doTrade: msg value is not correct for token trade"); |
| 176 | + } |
| 177 | + |
| 178 | + if (srcToken != ETH_TOKEN_ADDRESS) { |
| 179 | + // collect source amount |
| 180 | + require(srcToken.transferFrom(msg.sender, address(this), srcAmount), "doTrade: collect src token failed"); |
| 181 | + } |
| 182 | + |
| 183 | + IERC20[] memory path = getConversionPath(srcToken, destToken); |
| 184 | + require(path.length > 0, "doTrade: couldn't find path"); |
| 185 | + |
| 186 | + // BNT and ETH have the same decimals |
| 187 | + uint userExpectedDestAmount = calcDstQty(srcAmount, ETH_BNT_DECIMALS, ETH_BNT_DECIMALS, conversionRate); |
| 188 | + require(userExpectedDestAmount > 0, "doTrade: user expected amount must be greater than 0"); |
| 189 | + uint destAmount; |
| 190 | + |
| 191 | + if (srcToken == ETH_TOKEN_ADDRESS) { |
| 192 | + destAmount = bancorNetwork.convert2.value(srcAmount)(path, srcAmount, userExpectedDestAmount, address(0), 0); |
| 193 | + } else { |
| 194 | + destAmount = bancorNetwork.claimAndConvert2(path, srcAmount, userExpectedDestAmount, address(0), 0); |
| 195 | + } |
| 196 | + |
| 197 | + require(destAmount >= userExpectedDestAmount, "doTrade: dest amount is lower than expected amount"); |
| 198 | + |
| 199 | + // transfer back only expected dest amount |
| 200 | + if (destToken == ETH_TOKEN_ADDRESS) { |
| 201 | + destAddress.transfer(userExpectedDestAmount); |
| 202 | + } else { |
| 203 | + require(destToken.transfer(destAddress, userExpectedDestAmount), "doTrade: transfer back dest token failed"); |
| 204 | + } |
| 205 | + |
| 206 | + emit TradeExecute(msg.sender, address(srcToken), srcAmount, address(destToken), userExpectedDestAmount, destAddress); |
| 207 | + return true; |
| 208 | + } |
| 209 | + |
| 210 | + function getConversionPath(IERC20 src, IERC20 dest) public view returns(IERC20[] memory path) { |
| 211 | + IERC20 bntToken = bancorToken; |
| 212 | + |
| 213 | + if (src == bntToken) { |
| 214 | + // trade from BNT to ETH |
| 215 | + path = new IERC20[](3); |
| 216 | + path[0] = bntToken; |
| 217 | + path[1] = bntToken; |
| 218 | + path[2] = bancorEth; |
| 219 | + return path; |
| 220 | + } else if (dest == bntToken) { |
| 221 | + // trade from ETH to BNT |
| 222 | + path = new IERC20[](3); |
| 223 | + path[0] = bancorEth; |
| 224 | + path[1] = bntToken; |
| 225 | + path[2] = bntToken; |
| 226 | + return path; |
| 227 | + } |
| 228 | + } |
| 229 | + |
| 230 | + function valueAfterReducingFee(uint val) internal view returns(uint) { |
| 231 | + require(val <= MAX_QTY, "valueAfterReducingFee: val > MAX_QTY"); |
| 232 | + return ((BPS - feeBps) * val) / BPS; |
| 233 | + } |
| 234 | +} |
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