116 lines
3.8 KiB
Solidity
116 lines
3.8 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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import {Ownable} from "../lib/Ownable.sol";
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import {ExternalCall} from "../lib/ExternalCall.sol";
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import {IERC20} from "../intf/IERC20.sol";
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import {UniversalERC20} from "../lib/UniversalERC20.sol";
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import {SafeMath} from "../lib/SafeMath.sol";
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import {DecimalMath} from "../lib/DecimalMath.sol";
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import {ISmartApprove} from "../intf/ISmartApprove.sol";
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contract SmartSwap is Ownable {
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using SafeMath for uint256;
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using UniversalERC20 for IERC20;
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using ExternalCall for address;
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ISmartApprove public smartApprove;
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IERC20 constant ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
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event Swapped(
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IERC20 indexed fromToken,
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IERC20 indexed toToken,
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address indexed sender,
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uint256 fromAmount,
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uint256 returnAmount
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);
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event ExternalRecord(address indexed to, address indexed sender);
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constructor(address _smartApprove) public {
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smartApprove = ISmartApprove(_smartApprove);
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}
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function dodoSwap(
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IERC20 fromToken,
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IERC20 toToken,
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uint256 fromTokenAmount,
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uint256 minReturnAmount,
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address[] memory callPairs,
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bytes memory callDataConcat,
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uint256[] memory starts,
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uint256[] memory gasLimitsAndValues
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) public payable returns (uint256 returnAmount) {
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require(minReturnAmount > 0, "Min return should be bigger then 0.");
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require(callPairs.length > 0, "pairs should exists.");
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if (fromToken != ETH_ADDRESS) {
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smartApprove.claimTokens(fromToken, msg.sender, address(this), fromTokenAmount);
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}
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for (uint256 i = 0; i < callPairs.length; i++) {
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require(callPairs[i] != address(smartApprove), "Access denied");
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require(
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callPairs[i].externalCall(
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gasLimitsAndValues[i] & ((1 << 128) - 1),
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callDataConcat,
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starts[i],
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starts[i + 1] - starts[i],
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gasLimitsAndValues[i] >> 128
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),"Swap Transaction Error!"
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);
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}
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fromToken.universalTransfer(msg.sender, fromToken.universalBalanceOf(address(this)));
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returnAmount = toToken.universalBalanceOf(address(this));
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require(returnAmount >= minReturnAmount, "Return amount is not enough");
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toToken.universalTransfer(msg.sender, returnAmount);
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emit Swapped(fromToken, toToken, msg.sender, fromTokenAmount, returnAmount);
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}
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//TODO:change
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function externalSwap(
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IERC20 fromToken,
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IERC20 toToken,
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address approveTarget,
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address to,
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uint256 gasSwap,
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uint256 fromTokenAmount,
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uint256 minReturnAmount,
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bytes memory callDataConcat
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) public payable returns (uint256 returnAmount) {
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require(minReturnAmount > 0, "Min return should be bigger then 0.");
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if (fromToken != ETH_ADDRESS) {
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smartApprove.claimTokens(fromToken, msg.sender, address(this), fromTokenAmount);
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fromToken.approve(approveTarget, fromTokenAmount);
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}
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(bool success, ) = to.call{value: msg.value, gas: gasSwap}(callDataConcat);
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require(success, "Contract Swap execution Failed");
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// Return back all unswapped
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fromToken.universalTransfer(msg.sender, fromToken.universalBalanceOf(address(this)));
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returnAmount = toToken.universalBalanceOf(address(this));
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require(returnAmount >= minReturnAmount, "Return amount is not enough");
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toToken.universalTransfer(msg.sender, returnAmount);
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emit Swapped(fromToken, toToken, msg.sender, fromTokenAmount, returnAmount);
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emit ExternalRecord(to, msg.sender);
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}
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}
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