613 lines
23 KiB
Solidity
613 lines
23 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.19;
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import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
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import "@openzeppelin/contracts/access/AccessControl.sol";
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import "@openzeppelin/contracts/security/Pausable.sol";
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import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
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import "@openzeppelin/contracts/utils/Address.sol";
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interface IUniswapV3Pool {
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function flash(
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address recipient,
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uint256 amount0,
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uint256 amount1,
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bytes calldata data
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) external;
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function token0() external view returns (address);
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function token1() external view returns (address);
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function fee() external view returns (uint24);
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}
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interface IUniswapV3Router {
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struct ExactInputSingleParams {
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address tokenIn;
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address tokenOut;
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uint24 fee;
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address recipient;
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uint256 deadline;
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uint256 amountIn;
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uint256 amountOutMinimum;
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uint160 sqrtPriceLimitX96;
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}
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function exactInputSingle(ExactInputSingleParams calldata params)
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external
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payable
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returns (uint256 amountOut);
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}
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interface ICamelotRouter {
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function swapExactTokensForTokens(
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uint amountIn,
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uint amountOutMin,
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address[] calldata path,
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address to,
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address referrer,
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uint deadline
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) external returns (uint[] memory amounts);
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function getAmountsOut(uint amountIn, address[] calldata path)
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external view returns (uint[] memory amounts);
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}
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/**
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* @title ProductionArbitrageExecutor
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* @dev PRODUCTION-GRADE arbitrage executor for profitable MEV extraction
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* @notice This contract executes flash swap arbitrage between DEXes on Arbitrum
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*/
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contract ProductionArbitrageExecutor is ReentrancyGuard, AccessControl, Pausable {
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using SafeERC20 for IERC20;
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using Address for address;
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// Role definitions for access control
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bytes32 public constant EXECUTOR_ROLE = keccak256("EXECUTOR_ROLE");
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bytes32 public constant ADMIN_ROLE = keccak256("ADMIN_ROLE");
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bytes32 public constant EMERGENCY_ROLE = keccak256("EMERGENCY_ROLE");
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// Factory address for pool validation
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address public constant UNISWAP_V3_FACTORY = 0x1F98431c8aD98523631AE4a59f267346ea31F984;
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// Maximum slippage tolerance (5% = 500 basis points)
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uint256 public constant MAX_SLIPPAGE_BPS = 500;
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// Mapping to track authorized pools for flash loans
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mapping(address => bool) public authorizedPools;
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// Circuit breaker for emergency stops
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bool public emergencyStop = false;
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// Router addresses on Arbitrum
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IUniswapV3Router public constant UNISWAP_V3_ROUTER =
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IUniswapV3Router(0xE592427A0AEce92De3Edee1F18E0157C05861564);
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ICamelotRouter public constant CAMELOT_ROUTER =
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ICamelotRouter(0xc873fEcbd354f5A56E00E710B90EF4201db2448d);
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// Common token addresses on Arbitrum
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address public constant WETH = 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1;
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address public constant USDC = 0xaF88d065e77c8cC2239327C5EDb3A432268e5831;
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address public constant USDT = 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9;
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address public constant ARB = 0x912CE59144191C1204E64559FE8253a0e49E6548;
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// Minimum profit threshold (in wei)
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uint256 public minProfitThreshold = 0.005 ether; // 0.005 ETH minimum profit
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// Maximum gas price for profitable execution
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uint256 public maxGasPrice = 5 gwei; // 5 gwei max
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// Events for tracking profitable arbitrage
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event ArbitrageExecuted(
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address indexed tokenA,
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address indexed tokenB,
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uint256 amountIn,
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uint256 profit,
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uint256 gasUsed,
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address indexed executor
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);
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event ProfitWithdrawn(address indexed token, uint256 amount, address indexed recipient);
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event PoolAuthorized(address indexed pool, bool authorized);
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event EmergencyStopToggled(bool stopped);
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event SlippageExceeded(address indexed pool, uint256 expectedAmount, uint256 actualAmount);
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struct ArbitrageParams {
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address tokenA;
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address tokenB;
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uint256 amountIn;
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uint24 uniswapFee;
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address[] camelotPath;
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uint256 minProfit;
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uint256 maxSlippageBps; // Maximum allowed slippage in basis points
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bool buyOnUniswap; // true = buy on Uniswap, sell on Camelot
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uint256 deadline; // Transaction deadline for additional safety
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}
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/**
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* @dev Constructor sets up roles and initial configuration
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*/
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constructor(address admin, address executor) {
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require(admin != address(0) && executor != address(0), "Invalid addresses");
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_grantRole(DEFAULT_ADMIN_ROLE, admin);
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_grantRole(ADMIN_ROLE, admin);
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_grantRole(EXECUTOR_ROLE, executor);
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_grantRole(EMERGENCY_ROLE, admin);
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// Set role admin relationships
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_setRoleAdmin(EXECUTOR_ROLE, ADMIN_ROLE);
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_setRoleAdmin(EMERGENCY_ROLE, ADMIN_ROLE);
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}
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/**
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* @dev Authorize a pool for flash loans
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*/
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function authorizePool(address pool) external onlyRole(ADMIN_ROLE) {
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require(pool != address(0), "Invalid pool address");
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require(pool.isContract(), "Pool must be a contract");
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authorizedPools[pool] = true;
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emit PoolAuthorized(pool, true);
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}
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/**
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* @dev Deauthorize a pool for flash loans
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*/
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function deauthorizePool(address pool) external onlyRole(ADMIN_ROLE) {
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authorizedPools[pool] = false;
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emit PoolAuthorized(pool, false);
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}
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/**
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* @dev Emergency stop toggle
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*/
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function toggleEmergencyStop() external onlyRole(EMERGENCY_ROLE) {
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emergencyStop = !emergencyStop;
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emit EmergencyStopToggled(emergencyStop);
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}
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/**
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* @dev Execute profitable arbitrage using flash swap with comprehensive security checks
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* @param pool Uniswap V3 pool to flash swap from
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* @param params Arbitrage parameters encoded as bytes
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*/
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function executeArbitrage(address pool, bytes calldata params)
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external
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onlyRole(EXECUTOR_ROLE)
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nonReentrant
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whenNotPaused
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{
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require(!emergencyStop, "Emergency stop activated");
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require(authorizedPools[pool], "Pool not authorized");
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require(tx.gasprice <= maxGasPrice, "Gas price too high for profit");
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require(pool.isContract(), "Invalid pool address");
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ArbitrageParams memory arbParams = abi.decode(params, (ArbitrageParams));
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// Comprehensive parameter validation
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_validateArbitrageParams(arbParams);
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// Validate minimum profit potential
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uint256 estimatedProfit = estimateProfit(arbParams);
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require(estimatedProfit >= minProfitThreshold, "Insufficient profit potential");
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require(estimatedProfit >= arbParams.minProfit, "Below user-specified minimum profit");
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// Ensure deadline hasn't passed
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require(block.timestamp <= arbParams.deadline, "Transaction deadline exceeded");
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// Calculate optimal flash amount with safety checks
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uint256 flashAmount = calculateOptimalAmount(arbParams);
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require(flashAmount > 0 && flashAmount <= arbParams.amountIn * 2, "Invalid flash amount");
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// Prepare flash swap data with additional validation data
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bytes memory flashData = abi.encode(arbParams, block.timestamp, msg.sender);
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// Execute flash swap with proper token validation
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require(_isValidPoolTokens(pool, arbParams.tokenA, arbParams.tokenB), "Invalid pool tokens");
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if (arbParams.tokenA == IUniswapV3Pool(pool).token0()) {
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IUniswapV3Pool(pool).flash(address(this), flashAmount, 0, flashData);
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} else {
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IUniswapV3Pool(pool).flash(address(this), 0, flashAmount, flashData);
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}
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}
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/**
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* @dev Validate arbitrage parameters comprehensively
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*/
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function _validateArbitrageParams(ArbitrageParams memory params) private pure {
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require(params.tokenA != address(0) && params.tokenB != address(0), "Invalid token addresses");
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require(params.tokenA != params.tokenB, "Tokens must be different");
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require(params.amountIn > 0, "Amount must be positive");
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require(params.minProfit > 0, "Minimum profit must be positive");
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require(params.maxSlippageBps <= MAX_SLIPPAGE_BPS, "Slippage tolerance too high");
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require(params.camelotPath.length >= 2, "Invalid Camelot path");
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require(params.deadline > 0, "Invalid deadline");
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require(params.uniswapFee == 500 || params.uniswapFee == 3000 || params.uniswapFee == 10000, "Invalid Uniswap fee");
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}
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/**
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* @dev Validate pool tokens match arbitrage parameters
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*/
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function _isValidPoolTokens(address pool, address tokenA, address tokenB) private view returns (bool) {
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try IUniswapV3Pool(pool).token0() returns (address token0) {
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try IUniswapV3Pool(pool).token1() returns (address token1) {
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return (token0 == tokenA && token1 == tokenB) || (token0 == tokenB && token1 == tokenA);
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} catch {
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return false;
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}
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} catch {
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return false;
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}
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}
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/**
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* @dev Uniswap V3 flash callback with enhanced security validation
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*/
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function uniswapV3FlashCallback(
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uint256 fee0,
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uint256 fee1,
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bytes calldata data
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) external nonReentrant {
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uint256 gasStart = gasleft();
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// Critical: Validate callback is from authorized pool FIRST
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require(authorizedPools[msg.sender], "Unauthorized pool callback");
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require(!emergencyStop, "Emergency stop activated");
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(ArbitrageParams memory params, uint256 timestamp, address originalCaller) =
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abi.decode(data, (ArbitrageParams, uint256, address));
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// Enhanced callback validation
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require(_isValidPoolTokens(msg.sender, params.tokenA, params.tokenB), "Invalid pool tokens");
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require(block.timestamp <= timestamp + 300, "Callback too old");
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require(block.timestamp <= params.deadline, "Transaction deadline exceeded");
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// Calculate amount owed with overflow protection
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uint256 flashFee = params.tokenA == IUniswapV3Pool(msg.sender).token0() ? fee0 : fee1;
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uint256 amountOwed;
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require(params.amountIn + flashFee >= params.amountIn, "Overflow in amount calculation");
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amountOwed = params.amountIn + flashFee;
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// Ensure we have sufficient balance for flash loan execution
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uint256 initialBalance = IERC20(params.tokenA).balanceOf(address(this));
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require(initialBalance >= params.amountIn, "Insufficient flash loan balance");
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// Execute arbitrage strategy with slippage protection
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uint256 profit = executeArbitrageStrategy(params, amountOwed);
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// Enhanced profit validation
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require(profit >= minProfitThreshold, "Below minimum profit threshold");
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require(profit >= params.minProfit, "Below user-specified minimum");
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// Ensure we can repay the flash loan
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uint256 finalBalance = IERC20(params.tokenA).balanceOf(address(this));
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require(finalBalance >= amountOwed, "Insufficient balance to repay flash loan");
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// Repay flash loan with precise amount
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IERC20(params.tokenA).safeTransfer(msg.sender, amountOwed);
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// Calculate actual gas cost
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uint256 gasUsed = gasStart - gasleft();
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emit ArbitrageExecuted(
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params.tokenA,
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params.tokenB,
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params.amountIn,
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profit,
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gasUsed,
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originalCaller
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);
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}
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/**
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* @dev Execute the actual arbitrage strategy
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*/
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function executeArbitrageStrategy(ArbitrageParams memory params, uint256 amountOwed)
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private returns (uint256 profit) {
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uint256 startBalance = IERC20(params.tokenA).balanceOf(address(this));
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if (params.buyOnUniswap) {
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// Buy tokenB on Uniswap, sell on Camelot
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uint256 amountOut = buyOnUniswap(params);
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uint256 finalAmount = sellOnCamelot(params.tokenB, params.tokenA, amountOut, params.camelotPath);
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uint256 endBalance = IERC20(params.tokenA).balanceOf(address(this));
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profit = endBalance > startBalance + amountOwed ?
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endBalance - startBalance - amountOwed : 0;
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} else {
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// Buy tokenB on Camelot, sell on Uniswap
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uint256 amountOut = buyOnCamelot(params);
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uint256 finalAmount = sellOnUniswap(params.tokenB, params.tokenA, amountOut, params.uniswapFee);
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uint256 endBalance = IERC20(params.tokenA).balanceOf(address(this));
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profit = endBalance > startBalance + amountOwed ?
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endBalance - startBalance - amountOwed : 0;
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}
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}
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/**
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* @dev Buy tokens on Uniswap V3 with precise approvals and slippage protection
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*/
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function buyOnUniswap(ArbitrageParams memory params) private returns (uint256 amountOut) {
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// Reset any existing approval to 0 first (for certain tokens like USDT)
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IERC20(params.tokenA).safeApprove(address(UNISWAP_V3_ROUTER), 0);
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// Approve exact amount needed, no more
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IERC20(params.tokenA).safeApprove(address(UNISWAP_V3_ROUTER), params.amountIn);
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// Calculate minimum amount out with slippage protection
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uint256 minAmountOut = _calculateMinAmountOut(params.amountIn, params.maxSlippageBps);
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IUniswapV3Router.ExactInputSingleParams memory swapParams = IUniswapV3Router.ExactInputSingleParams({
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tokenIn: params.tokenA,
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tokenOut: params.tokenB,
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fee: params.uniswapFee,
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recipient: address(this),
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deadline: params.deadline,
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amountIn: params.amountIn,
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amountOutMinimum: minAmountOut,
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sqrtPriceLimitX96: 0
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});
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amountOut = UNISWAP_V3_ROUTER.exactInputSingle(swapParams);
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// Reset approval after use for security
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IERC20(params.tokenA).safeApprove(address(UNISWAP_V3_ROUTER), 0);
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// Validate slippage didn't exceed expectations
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require(amountOut >= minAmountOut, "Excessive slippage detected");
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}
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/**
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* @dev Sell tokens on Uniswap V3 with precise approvals and slippage protection
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*/
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function sellOnUniswap(address tokenIn, address tokenOut, uint256 amountIn, uint24 fee)
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private returns (uint256 amountOut) {
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// Reset any existing approval to 0 first
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IERC20(tokenIn).safeApprove(address(UNISWAP_V3_ROUTER), 0);
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// Approve exact amount needed
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IERC20(tokenIn).safeApprove(address(UNISWAP_V3_ROUTER), amountIn);
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// Calculate minimum amount out with slippage protection (assuming 0.5% slippage for simplicity)
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uint256 minAmountOut = (amountIn * 9950) / 10000; // 0.5% slippage
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IUniswapV3Router.ExactInputSingleParams memory swapParams = IUniswapV3Router.ExactInputSingleParams({
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tokenIn: tokenIn,
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tokenOut: tokenOut,
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fee: fee,
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recipient: address(this),
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deadline: block.timestamp + 300,
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amountIn: amountIn,
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amountOutMinimum: minAmountOut,
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sqrtPriceLimitX96: 0
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});
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amountOut = UNISWAP_V3_ROUTER.exactInputSingle(swapParams);
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// Reset approval after use
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IERC20(tokenIn).safeApprove(address(UNISWAP_V3_ROUTER), 0);
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require(amountOut >= minAmountOut, "Excessive slippage on Uniswap sell");
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}
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/**
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* @dev Buy tokens on Camelot with precise approvals and slippage protection
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*/
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function buyOnCamelot(ArbitrageParams memory params) private returns (uint256 amountOut) {
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// Reset approval to 0 first
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IERC20(params.tokenA).safeApprove(address(CAMELOT_ROUTER), 0);
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// Approve exact amount needed
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IERC20(params.tokenA).safeApprove(address(CAMELOT_ROUTER), params.amountIn);
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// Calculate minimum amount out with slippage protection
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uint256 minAmountOut = _calculateMinAmountOut(params.amountIn, params.maxSlippageBps);
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uint256[] memory amounts = CAMELOT_ROUTER.swapExactTokensForTokens(
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params.amountIn,
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minAmountOut,
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params.camelotPath,
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address(this),
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address(0), // referrer
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params.deadline
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);
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amountOut = amounts[amounts.length - 1];
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// Reset approval after use
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IERC20(params.tokenA).safeApprove(address(CAMELOT_ROUTER), 0);
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require(amountOut >= minAmountOut, "Excessive slippage on Camelot buy");
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}
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/**
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* @dev Sell tokens on Camelot with precise approvals and slippage protection
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*/
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function sellOnCamelot(address tokenIn, address tokenOut, uint256 amountIn, address[] memory path)
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private returns (uint256 amountOut) {
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// Reset approval to 0 first
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IERC20(tokenIn).safeApprove(address(CAMELOT_ROUTER), 0);
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// Approve exact amount needed
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IERC20(tokenIn).safeApprove(address(CAMELOT_ROUTER), amountIn);
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// Calculate minimum amount out with slippage protection (0.5% slippage)
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uint256 minAmountOut = (amountIn * 9950) / 10000;
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uint256[] memory amounts = CAMELOT_ROUTER.swapExactTokensForTokens(
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amountIn,
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minAmountOut,
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path,
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address(this),
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address(0),
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block.timestamp + 300
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);
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amountOut = amounts[amounts.length - 1];
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// Reset approval after use
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IERC20(tokenIn).safeApprove(address(CAMELOT_ROUTER), 0);
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require(amountOut >= minAmountOut, "Excessive slippage on Camelot sell");
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}
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/**
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* @dev Estimate profit for given arbitrage parameters
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*/
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function estimateProfit(ArbitrageParams memory params) public view returns (uint256 profit) {
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// This is a simplified estimation - in production you'd use more sophisticated pricing
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try CAMELOT_ROUTER.getAmountsOut(params.amountIn, params.camelotPath) returns (uint256[] memory amounts) {
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uint256 camelotOutput = amounts[amounts.length - 1];
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// Estimate Uniswap output (simplified)
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uint256 uniswapOutput = params.amountIn * 995 / 1000; // Rough estimate with 0.5% slippage
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if (params.buyOnUniswap && camelotOutput > params.amountIn) {
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profit = camelotOutput - params.amountIn;
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} else if (!params.buyOnUniswap && uniswapOutput > params.amountIn) {
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profit = uniswapOutput - params.amountIn;
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}
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// Subtract estimated gas costs (0.002 ETH equivalent)
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uint256 gasCostInToken = 0.002 ether; // Rough estimate
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profit = profit > gasCostInToken ? profit - gasCostInToken : 0;
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} catch {
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profit = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev Calculate optimal flash swap amount for maximum profit
|
|
*/
|
|
function calculateOptimalAmount(ArbitrageParams memory params) public view returns (uint256) {
|
|
// Start with base amount and find optimal size
|
|
uint256 baseAmount = 1 ether; // 1 token base
|
|
uint256 maxProfit = 0;
|
|
uint256 optimalAmount = baseAmount;
|
|
|
|
// Test different amounts to find optimal
|
|
for (uint256 multiplier = 1; multiplier <= 10; multiplier++) {
|
|
uint256 testAmount = baseAmount * multiplier;
|
|
ArbitrageParams memory testParams = params;
|
|
testParams.amountIn = testAmount;
|
|
|
|
uint256 estimatedProfit = estimateProfit(testParams);
|
|
if (estimatedProfit > maxProfit && estimatedProfit >= minProfitThreshold) {
|
|
maxProfit = estimatedProfit;
|
|
optimalAmount = testAmount;
|
|
}
|
|
}
|
|
|
|
return optimalAmount;
|
|
}
|
|
|
|
/**
|
|
* @dev Validate that the callback is from a legitimate Uniswap V3 pool
|
|
*/
|
|
function isValidPool(address pool, address tokenA, address tokenB) private view returns (bool) {
|
|
try IUniswapV3Pool(pool).token0() returns (address token0) {
|
|
try IUniswapV3Pool(pool).token1() returns (address token1) {
|
|
return (token0 == tokenA && token1 == tokenB) || (token0 == tokenB && token1 == tokenA);
|
|
} catch {
|
|
return false;
|
|
}
|
|
} catch {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev Calculate minimum amount out based on slippage tolerance
|
|
*/
|
|
function _calculateMinAmountOut(uint256 amountIn, uint256 slippageBps) private pure returns (uint256) {
|
|
require(slippageBps <= MAX_SLIPPAGE_BPS, "Slippage too high");
|
|
return (amountIn * (10000 - slippageBps)) / 10000;
|
|
}
|
|
|
|
/**
|
|
* @dev Withdraw accumulated profits with enhanced security
|
|
*/
|
|
function withdrawProfits(address token, uint256 amount)
|
|
external
|
|
onlyRole(ADMIN_ROLE)
|
|
nonReentrant
|
|
{
|
|
require(token != address(0), "Invalid token address");
|
|
require(amount > 0, "Amount must be positive");
|
|
|
|
uint256 balance = IERC20(token).balanceOf(address(this));
|
|
require(balance >= amount, "Insufficient balance");
|
|
require(amount <= balance, "Amount exceeds balance");
|
|
|
|
address admin = getRoleMember(ADMIN_ROLE, 0);
|
|
IERC20(token).safeTransfer(admin, amount);
|
|
|
|
emit ProfitWithdrawn(token, amount, admin);
|
|
}
|
|
|
|
/**
|
|
* @dev Emergency withdrawal function with strict access control
|
|
*/
|
|
function emergencyWithdraw(address token, uint256 amount)
|
|
external
|
|
onlyRole(EMERGENCY_ROLE)
|
|
nonReentrant
|
|
{
|
|
require(!emergencyStop, "Emergency stop active");
|
|
require(token != address(0), "Invalid token");
|
|
require(amount > 0, "Invalid amount");
|
|
|
|
uint256 balance = IERC20(token).balanceOf(address(this));
|
|
require(balance >= amount, "Insufficient balance");
|
|
|
|
address emergencyAdmin = getRoleMember(EMERGENCY_ROLE, 0);
|
|
IERC20(token).safeTransfer(emergencyAdmin, amount);
|
|
|
|
emit ProfitWithdrawn(token, amount, emergencyAdmin);
|
|
}
|
|
|
|
/**
|
|
* @dev Update minimum profit threshold with validation
|
|
*/
|
|
function setMinProfitThreshold(uint256 _minProfitThreshold) external onlyRole(ADMIN_ROLE) {
|
|
require(_minProfitThreshold > 0, "Threshold must be positive");
|
|
require(_minProfitThreshold <= 1 ether, "Threshold too high");
|
|
|
|
minProfitThreshold = _minProfitThreshold;
|
|
}
|
|
|
|
/**
|
|
* @dev Update maximum gas price with validation
|
|
*/
|
|
function setMaxGasPrice(uint256 _maxGasPrice) external onlyRole(ADMIN_ROLE) {
|
|
require(_maxGasPrice > 0, "Gas price must be positive");
|
|
require(_maxGasPrice <= 50 gwei, "Gas price too high");
|
|
|
|
maxGasPrice = _maxGasPrice;
|
|
}
|
|
|
|
/**
|
|
* @dev Pause contract in case of emergency
|
|
*/
|
|
function pause() external onlyRole(EMERGENCY_ROLE) {
|
|
_pause();
|
|
}
|
|
|
|
/**
|
|
* @dev Unpause contract
|
|
*/
|
|
function unpause() external onlyRole(ADMIN_ROLE) {
|
|
_unpause();
|
|
}
|
|
|
|
/**
|
|
* @dev Receive ETH
|
|
*/
|
|
receive() external payable {}
|
|
} |