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ZRXSwapper.sol
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// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4 <0.9.0;
import './AsyncSwapper.sol';
interface IZRXSwapper is IAsyncSwapper {
error TradeReverted();
// solhint-disable-next-line func-name-mixedcase
function ZRX() external view returns (address);
}
contract ZRXSwapper is IZRXSwapper, AsyncSwapper {
using SafeERC20 for IERC20;
// solhint-disable-next-line var-name-mixedcase
address public immutable override ZRX;
constructor(
address _governor,
address _tradeFactory,
// solhint-disable-next-line var-name-mixedcase
address _ZRX
) AsyncSwapper(_governor, _tradeFactory) {
ZRX = _ZRX;
}
function _executeSwap(
address _receiver,
address _tokenIn,
address _tokenOut,
uint256 _amountIn,
bytes calldata _data
) internal override {
uint256 _initialBalanceTokenIn = IERC20(_tokenIn).balanceOf(address(this));
IERC20(_tokenIn).approve(ZRX, 0);
IERC20(_tokenIn).approve(ZRX, _amountIn);
// solhint-disable-next-line avoid-low-level-calls
(bool success, ) = ZRX.call{value: 0}(_data);
if (!success) revert TradeReverted();
// Check that token in & amount in was correct (should be in AsyncSwapper)
if (_initialBalanceTokenIn - IERC20(_tokenIn).balanceOf(address(this)) < _amountIn) revert CommonErrors.IncorrectSwapInformation();
IERC20(_tokenOut).safeTransfer(_receiver, IERC20(_tokenOut).balanceOf(address(this)));
}
}