// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
interface ILendingPool {
function flashLoan(
address receiver,
address calldata assets,
uint256 calldata amounts,
uint256 calldata modes,
address onBehalfOf,
bytes calldata params,
uint16 referralCode
) external;
}
interface UniswapV2Router {
function getAmountsOut(uint amountIn, address memory path) external view returns (uint memory amounts);
function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address calldata path, address to, uint deadline) external returns (uint memory amounts);
}
interface TokenInterface {
function balanceOf(address account) external view returns (uint256);
}
contract ArbitrageManager {
using SafeMath for uint256;
address public owner;
address public yieldExchangeAddress;
address public tokenAddress;
address public uniswapRouterAddress; // Address of Uniswap router
address public lendingPoolAddress; // Address of the Aave lending pool
uint256 public constant ARBITRAGE_WINDOW = 10 minutes;
bool public emergencyStop = false;
uint256 public maxSlippagePercentage = 1; // Maximum allowed slippage percentage
modifier onlyOwner() {
require(msg.sender == owner, "Only the owner can perform this action");
_;
}
modifier notPaused() {
require(!emergencyStop, "Contract is paused");
_;
}
constructor(
address _yieldExchangeAddress,
address _tokenAddress,
address _uniswapRouterAddress,
address _lendingPoolAddress
) {
owner = msg.sender;
yieldExchangeAddress = _yieldExchangeAddress;
tokenAddress = _tokenAddress;
uniswapRouterAddress = _uniswapRouterAddress;
lendingPoolAddress = _lendingPoolAddress;
}
function setOwner(address _newOwner) external onlyOwner {
owner = _newOwner;
}
function setYieldExchangeAddress(address _newYieldExchange) external onlyOwner notPaused {
yieldExchangeAddress = _newYieldExchange;
}
function setTokenAddress(address _newToken) external onlyOwner notPaused {
tokenAddress = _newToken;
}
function setUniswapRouterAddress(address _newUniswapRouter) external onlyOwner notPaused {
uniswapRouterAddress = _newUniswapRouter;
}
function setLendingPoolAddress(address _newLendingPool) external onlyOwner notPaused {
lendingPoolAddress = _newLendingPool;
}
function setEmergencyStop(bool _emergencyStop) external onlyOwner {
emergencyStop = _emergencyStop;
}
function setMaxSlippagePercentage(uint256 _maxSlippagePercentage) external onlyOwner {
require(_maxSlippagePercentage <= 5, "Slippage percentage cannot exceed 5%");
maxSlippagePercentage = _maxSlippagePercentage;
}
// Function to perform an arbitrage action using Aave flash loan
function performArbitrage() external onlyOwner notPaused {
require(block.timestamp < block.timestamp.add(ARBITRAGE_WINDOW), "Arbitrage window closed");
// Interact with the external Token contract using the interface
TokenInterface token = TokenInterface(tokenAddress);
uint256 initialBalance = token.balanceOf(address(this));
// Execute arbitrage between Uniswap and external platforms
executeArbitrage(initialBalance);
// Example: Transfer remaining tokens to the YieldExchange contract
uint256 finalBalance = token.balanceOf(address(this));
uint256 profit = finalBalance.sub(initialBalance);
// Repay flash loan and return profit to the owner
repayFlashLoanAndReturnProfit(profit);
}
// Internal function to execute arbitrage between Uniswap and external platforms
function executeArbitrage(uint256 initialBalance) internal {
// Specify token paths for Uniswap
address[] memory pathUniswap = new address[](2);
pathUniswap[0] = tokenAddress;
pathUniswap[1] = address(this);
// Interact with Uniswap to get expected output amount
uint[] memory amountsUniswap = UniswapV2Router(uniswapRouterAddress).getAmountsOut(1e18, pathUniswap);
uint256 expectedOutputUniswap = amountsUniswap[1];
// Calculate slippage
uint256 slippage = expectedOutputUniswap.mul(maxSlippagePercentage).div(100);
// Arbitrage condition: If Uniswap has a better price (considering slippage)
if (expectedOutputUniswap.add(slippage) > initialBalance) {
// Execute swap on Uniswap
uint256 amountOutMin = expectedOutputUniswap.sub(slippage);
UniswapV2Router(uniswapRouterAddress).swapExactTokensForTokens(
1e18,
amountOutMin,
pathUniswap,
address(this),
block.timestamp
);
}
// Add more external platforms and logic as needed
}
// Internal function to repay flash loan and return profit to the owner
function repayFlashLoanAndReturnProfit(uint256 profit) internal {
// Interact with the Aave lending pool using the interface
ILendingPool lendingPool = ILendingPool(lendingPoolAddress);
// Define flash loan parameters
address[] memory assets = new address[](1);
assets[0] = tokenAddress;
uint256[] memory amounts = new uint256[](1);
amounts[0] = profit;
uint256[] memory modes = new uint256[](1);
modes[0] = 0; // 0 for no debt
address onBehalfOf = address(this);
bytes memory params = abi.encode(profit);
// Execute flash loan repayment
lendingPool.flashLoan(onBehalfOf, assets, amounts, modes, address(this), params, 0);
}
// Callback function to be executed by Aave after the flash loan repayment
function executeArbitrageWithFlashLoan(uint256 profit) external {
// Additional risk management logic can be added here if needed
// Example: Transfer profit to the owner
TokenInterface token