feat: move encoding to test

foundry/src/executors/UniswapV4Executor.sol

@@ -2,14 +2,9 @@
 pragma solidity ^0.8.26;
 
 import "@interfaces/IExecutor.sol";
-import {
-    IERC20,
-    SafeERC20
-} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {IERC20, SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import {IPoolManager} from "@uniswap/v4-core/src/interfaces/IPoolManager.sol";
-import {
-    Currency, CurrencyLibrary
-} from "@uniswap/v4-core/src/types/Currency.sol";
+import {Currency, CurrencyLibrary} from "@uniswap/v4-core/src/types/Currency.sol";
 import {PoolKey} from "@uniswap/v4-core/src/types/PoolKey.sol";
 import {IHooks} from "@uniswap/v4-core/src/interfaces/IHooks.sol";
 import {V4Router} from "@uniswap/v4-periphery/src/V4Router.sol";
@@ -26,56 +21,17 @@ contract UniswapV4Executor is IExecutor, V4Router {
 
     constructor(IPoolManager _poolManager) V4Router(_poolManager) {}
 
-    function swap(uint256 amountIn, bytes calldata data)
-        external
-        payable
-        returns (uint256 amountOut)
-    {
-        (
-            address tokenIn,
-            address tokenOut,
-            uint24 fee,
-            address receiver,
-            bool zeroForOne,
-            uint24 tickSpacing
-        ) = _decodeData(data);
+    function swap(
+        uint256,
+        bytes calldata data
+    ) external payable returns (uint256 amountOut) {
+        (, address tokenOut, , address receiver, , ) = _decodeData(data);
 
-        uint128 amountIn128 = uint128(amountIn);
         uint256 balanceBefore = IERC20(tokenOut).balanceOf(receiver);
 
-        PoolKey memory key = PoolKey({
-            currency0: Currency.wrap(zeroForOne ? tokenIn : tokenOut),
-            currency1: Currency.wrap(zeroForOne ? tokenOut : tokenIn),
-            fee: fee,
-            tickSpacing: int24(tickSpacing),
-            hooks: IHooks(address(0))
-        });
-
-        bytes memory actions = abi.encodePacked(
-            uint8(Actions.SWAP_EXACT_IN_SINGLE),
-            uint8(Actions.SETTLE_ALL),
-            uint8(Actions.TAKE)
-        );
-
-        bytes[] memory params = new bytes[](3);
-
-        params[0] = abi.encode(
-            IV4Router.ExactInputSingleParams({
-                poolKey: key,
-                zeroForOne: zeroForOne,
-                amountIn: amountIn128,
-                amountOutMinimum: 0,
-                hookData: bytes("")
-            })
-        );
-
-        params[1] = abi.encode(key.currency0, amountIn128);
-        params[2] = abi.encode(key.currency1, receiver, 0);
-
-        this.executeActions(abi.encode(actions, params));
+        this.executeActions(data);
 
         amountOut = IERC20(tokenOut).balanceOf(receiver) - balanceBefore;
-
         if (amountOut == 0) revert UniswapV4Executor__SwapFailed();
 
         return amountOut;
@@ -85,7 +41,9 @@ contract UniswapV4Executor is IExecutor, V4Router {
         _executeActions(actions);
     }
 
-    function _decodeData(bytes calldata data)
+    function _decodeData(
+        bytes calldata data
+    )
         internal
         pure
         returns (
@@ -97,22 +55,35 @@ contract UniswapV4Executor is IExecutor, V4Router {
             uint24 tickSpacing
         )
     {
-        if (data.length != 67) {
-            revert UniswapV4Executor__InvalidDataLength();
-        }
+        (, bytes[] memory params) = abi.decode(data, (bytes, bytes[]));
 
-        tokenIn = address(bytes20(data[:20]));
-        tokenOut = address(bytes20(data[20:40]));
-        fee = uint24(bytes3(data[40:43]));
-        receiver = address(bytes20(data[43:63]));
-        zeroForOne = uint8(bytes1(data[63])) > 0;
-        tickSpacing = uint24(bytes3(data[64:67]));
+        IV4Router.ExactInputSingleParams memory swapParams = abi.decode(
+            params[0],
+            (IV4Router.ExactInputSingleParams)
+        );
+
+        (, address _receiver, ) = abi.decode(
+            params[2],
+            (Currency, address, uint256)
+        );
+
+        tokenIn = swapParams.zeroForOne
+            ? address(uint160(swapParams.poolKey.currency0.toId()))
+            : address(uint160(swapParams.poolKey.currency1.toId()));
+        tokenOut = swapParams.zeroForOne
+            ? address(uint160(swapParams.poolKey.currency1.toId()))
+            : address(uint160(swapParams.poolKey.currency0.toId()));
+        fee = swapParams.poolKey.fee;
+        receiver = _receiver;
+        zeroForOne = swapParams.zeroForOne;
+        tickSpacing = uint24(swapParams.poolKey.tickSpacing);
     }
 
-    function _pay(Currency token, address payer, uint256 amount)
-        internal
-        override
-    {
+    function _pay(
+        Currency token,
+        address payer,
+        uint256 amount
+    ) internal override {
         token.transfer(payer, amount);
     }
 

foundry/test/executors/UniswapV4Executor.t.sol

@@ -9,7 +9,9 @@ import {console} from "forge-std/console.sol";
 contract UniswapV4ExecutorExposed is UniswapV4Executor {
     constructor(IPoolManager _poolManager) UniswapV4Executor(_poolManager) {}
 
-    function decodeData(bytes calldata data)
+    function decodeData(
+        bytes calldata data
+    )
         external
         pure
         returns (
@@ -36,14 +38,23 @@ contract UniswapV4ExecutorTest is Test, Constants {
     function setUp() public {
         uint256 forkBlock = 21817316;
         vm.createSelectFork(vm.rpcUrl("mainnet"), forkBlock);
-        uniswapV4Exposed =
-            new UniswapV4ExecutorExposed(IPoolManager(poolManager));
+        uniswapV4Exposed = new UniswapV4ExecutorExposed(
+            IPoolManager(poolManager)
+        );
     }
 
     function testDecodeParamsUniswapV4() public view {
         uint24 expectedPoolFee = 500;
-        bytes memory data = abi.encodePacked(
-            USDE_ADDR, USDT_ADDR, expectedPoolFee, address(2), false, int24(1)
+        address expectedReceiver = address(2);
+
+        bytes memory data = _encodeExactInputSingle(
+            USDE_ADDR,
+            USDT_ADDR,
+            expectedPoolFee,
+            expectedReceiver,
+            false,
+            1,
+            100 // amountIn doesn't matter for this test
         );
 
         (
@@ -58,36 +69,31 @@ contract UniswapV4ExecutorTest is Test, Constants {
         assertEq(tokenIn, USDE_ADDR);
         assertEq(tokenOut, USDT_ADDR);
         assertEq(fee, expectedPoolFee);
-        assertEq(receiver, address(2));
+        assertEq(receiver, expectedReceiver);
         assertEq(zeroForOne, false);
         assertEq(tickSpacing, 1);
     }
 
-    function testDecodeParamsInvalidDataLength() public {
-        bytes memory data = abi.encodePacked(USDE_ADDR, USDT_ADDR);
-
-        vm.expectRevert(UniswapV4Executor__InvalidDataLength.selector);
-        uniswapV4Exposed.decodeData(data);
-    }
-
     function testSwapUniswapV4() public {
         vm.startPrank(BOB);
         uint256 amountIn = 100 ether;
         deal(USDE_ADDR, address(uniswapV4Exposed), amountIn);
         uint256 usdeBalanceBeforePool = USDE.balanceOf(poolManager);
-        uint256 usdeBalanceBeforeSwapExecutor =
-            USDE.balanceOf(address(uniswapV4Exposed));
+        uint256 usdeBalanceBeforeSwapExecutor = USDE.balanceOf(
+            address(uniswapV4Exposed)
+        );
         assertEq(usdeBalanceBeforeSwapExecutor, amountIn);
         uint256 usdtBalanceBeforeSwapBob = USDT.balanceOf(address(BOB));
         assertEq(usdtBalanceBeforeSwapBob, 0);
 
-        bytes memory data = abi.encodePacked(
+        bytes memory data = _encodeExactInputSingle(
             USDE_ADDR,
             USDT_ADDR,
-            uint24(100), // 0.01% fee tier
+            100,
             BOB,
             true,
-            int24(1)
+            1,
+            uint128(amountIn)
         );
 
         uint256 amountOut = uniswapV4Exposed.swap(amountIn, data);
@@ -98,4 +104,45 @@ contract UniswapV4ExecutorTest is Test, Constants {
         );
         assertTrue(USDT.balanceOf(BOB) == amountOut && amountOut > 0);
     }
+
+    function _encodeExactInputSingle(
+        address tokenIn,
+        address tokenOut,
+        uint24 fee,
+        address receiver,
+        bool zeroForOne,
+        uint24 tickSpacing,
+        uint128 amountIn
+    ) internal pure returns (bytes memory) {
+        PoolKey memory key = PoolKey({
+            currency0: Currency.wrap(zeroForOne ? tokenIn : tokenOut),
+            currency1: Currency.wrap(zeroForOne ? tokenOut : tokenIn),
+            fee: fee,
+            tickSpacing: int24(tickSpacing),
+            hooks: IHooks(address(0))
+        });
+
+        bytes memory actions = abi.encodePacked(
+            uint8(Actions.SWAP_EXACT_IN_SINGLE),
+            uint8(Actions.SETTLE_ALL),
+            uint8(Actions.TAKE)
+        );
+
+        bytes[] memory params = new bytes[](3);
+
+        params[0] = abi.encode(
+            IV4Router.ExactInputSingleParams({
+                poolKey: key,
+                zeroForOne: zeroForOne,
+                amountIn: amountIn,
+                amountOutMinimum: 0,
+                hookData: bytes("")
+            })
+        );
+
+        params[1] = abi.encode(key.currency0, amountIn);
+        params[2] = abi.encode(key.currency1, receiver, 0);
+
+        return abi.encode(actions, params);
+    }
 }