feat: add univ4 executor

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "foundry/lib/v3-core"]
 	path = foundry/lib/v3-core
 	url = https://github.com/Uniswap/v3-core
+[submodule "foundry/lib/v4-core"]
+	path = foundry/lib/v4-core
+	url = https://github.com/Uniswap/v4-core

foundry/remappings.txt

@@ -5,4 +5,5 @@
 @uniswap-v2/=lib/v2-core/
 @balancer-labs/v2-interfaces=lib/balancer-v2-monorepo/pkg/interfaces
 @uniswap/v3-updated/=lib/v3-updated/
-@uniswap/v3-core/=lib/v3-core/
+@uniswap/v3-core/=lib/v3-core/
+@uniswap/v4-core/=lib/v4-core/src/

foundry/src/executors/UniswapV4Executor.sol

@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+import "@interfaces/IExecutor.sol";
+import {
+    IERC20,
+    SafeERC20
+} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {IPoolManager} from "@uniswap/v4-core/interfaces/IPoolManager.sol";
+import {Currency, CurrencyLibrary} from "@uniswap/v4-core/types/Currency.sol";
+import {PoolKey} from "@uniswap/v4-core/types/PoolKey.sol";
+import {BalanceDelta} from "@uniswap/v4-core/types/BalanceDelta.sol";
+import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
+import {IHooks} from "@uniswap/v4-core/interfaces/IHooks.sol";
+
+error UniswapV4Executor__InvalidDataLength();
+error UniswapV4Executor__SwapFailed();
+
+contract UniswapV4Executor is IExecutor {
+    using SafeERC20 for IERC20;
+    using CurrencyLibrary for Currency;
+    using SafeCast for int128;
+    using SafeCast for int256;
+
+    uint256 private constant MIN_SQRT_RATIO = 4295128739;
+    uint256 private constant MAX_SQRT_RATIO =
+        1461446703485210103287273052203988822378723970342;
+
+    // slither-disable-next-line locked-ether
+    function swap(uint256 amountIn, bytes calldata data)
+        external
+        payable
+        returns (uint256 amountOut)
+    {
+        (
+            address tokenIn,
+            address tokenOut,
+            uint24 fee,
+            address receiver,
+            address target,
+            bool zeroForOne
+        ) = _decodeData(data);
+
+        PoolKey memory key = PoolKey({
+            currency0: Currency.wrap(zeroForOne ? tokenIn : tokenOut),
+            currency1: Currency.wrap(zeroForOne ? tokenOut : tokenIn),
+            fee: fee,
+            tickSpacing: 60, // Standard tick spacing
+            hooks: IHooks(address(0))  // No hooks needed for basic swaps
+        });
+
+        IPoolManager.SwapParams memory params = IPoolManager.SwapParams({
+            zeroForOne: zeroForOne,
+            amountSpecified: int256(amountIn),
+            sqrtPriceLimitX96: uint160(zeroForOne ? MIN_SQRT_RATIO + 1 : MAX_SQRT_RATIO - 1)
+        });
+
+        IPoolManager poolManager = IPoolManager(target);
+        
+        try poolManager.swap(key, params, abi.encode(key)) returns (BalanceDelta delta) {
+            if (zeroForOne) {
+                amountOut = delta.amount1() < 0 ? (-delta.amount1()).toUint256() : 0;
+            } else {
+                amountOut = delta.amount0() < 0 ? (-delta.amount0()).toUint256() : 0;
+            }
+
+            if (receiver != address(this)) {
+                IERC20(tokenOut).safeTransfer(receiver, amountOut);
+            }
+        } catch {
+            revert UniswapV4Executor__SwapFailed();
+        }
+    }
+
+    function _decodeData(bytes calldata data)
+        internal
+        pure
+        returns (
+            address tokenIn,
+            address tokenOut,
+            uint24 fee,
+            address receiver,
+            address target,
+            bool zeroForOne
+        )
+    {
+        if (data.length != 84) {
+            revert UniswapV4Executor__InvalidDataLength();
+        }
+
+        tokenIn = address(bytes20(data[0:20]));
+        tokenOut = address(bytes20(data[20:40]));
+        fee = uint24(bytes3(data[40:43]));
+        receiver = address(bytes20(data[43:63]));
+        target = address(bytes20(data[63:83]));
+        zeroForOne = uint8(data[83]) > 0;
+    }
+
+    
+}