chore: Misc improvements:

- Don't use payable(receiver).transfer(amount) and use OpenZeppelin's Address.sendValue instead
- In Univ4Executor send funds to the poolManager and not msg.sender
- In OneTransferFromOnly:
  - rename method name
  - don't pass the sender but hardcode it to caller() (msg.sender)
  - Move marking the transfer as done up (before we actually transfer) to prevent reentrancy attacks

Took 18 minutes

foundry/src/OneTransferFromOnly.sol

@@ -43,17 +43,16 @@ contract OneTransferFromOnly {
     }
 
     // slither-disable-next-line assembly
-    function tstoreTransferFromInfo(
+    function _tstoreTransferFromInfo(
         address tokenIn,
         uint256 amountIn,
-        bool isPermit2,
-        address sender
+        bool isPermit2
     ) internal {
         assembly {
             tstore(_TOKEN_IN_SLOT, tokenIn)
             tstore(_AMOUNT_IN_SLOT, amountIn)
             tstore(_IS_PERMIT2_SLOT, isPermit2)
-            tstore(_SENDER_SLOT, sender)
+            tstore(_SENDER_SLOT, caller())
             tstore(_IS_TRANSFER_EXECUTED_SLOT, false)
         }
     }
@@ -75,19 +74,15 @@ contract OneTransferFromOnly {
         if (isTransferExecuted) {
             revert OneTransferFromOnly__MultipleTransferFrom();
         }
-
+        assembly {
+            tstore(_IS_TRANSFER_EXECUTED_SLOT, true)
+        }
         if (isPermit2) {
             // Permit2.permit is already called from the TychoRouter
             permit2.transferFrom(sender, receiver, uint160(amount), tokenIn);
-            assembly {
-                tstore(_IS_TRANSFER_EXECUTED_SLOT, true)
-            }
         } else {
             // slither-disable-next-line arbitrary-send-erc20
             IERC20(tokenIn).safeTransferFrom(sender, receiver, amount);
-            assembly {
-                tstore(_IS_TRANSFER_EXECUTED_SLOT, true)
-            }
         }
     }
 }

foundry/src/TychoRouter.sol

@@ -140,7 +140,7 @@ contract TychoRouter is
         bytes calldata swaps
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
         uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
-        tstoreTransferFromInfo(tokenIn, amountIn, false, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false);
         if (transferFromNeeded) {
             _transfer(address(this));
         }
@@ -205,7 +205,7 @@ contract TychoRouter is
         if (tokenIn != address(0)) {
             permit2.permit(msg.sender, permitSingle, signature);
         }
-        tstoreTransferFromInfo(tokenIn, amountIn, true, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, true);
         if (transferFromNeeded) {
             _transfer(address(this));
         }
@@ -262,7 +262,7 @@ contract TychoRouter is
         bytes calldata swaps
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
         uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
-        tstoreTransferFromInfo(tokenIn, amountIn, false, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false);
         if (transferFromNeeded) {
             _transfer(tokenInReceiver);
         }
@@ -325,7 +325,7 @@ contract TychoRouter is
             permit2.permit(msg.sender, permitSingle, signature);
         }
 
-        tstoreTransferFromInfo(tokenIn, amountIn, true, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, true);
         if (transferFromNeeded) {
             _transfer(tokenInReceiver);
         }
@@ -377,7 +377,7 @@ contract TychoRouter is
         bytes calldata swapData
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
         uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
-        tstoreTransferFromInfo(tokenIn, amountIn, false, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false);
         if (transferFromNeeded) {
             _transfer(tokenInReceiver);
         }
@@ -439,7 +439,7 @@ contract TychoRouter is
         if (tokenIn != address(0)) {
             permit2.permit(msg.sender, permitSingle, signature);
         }
-        tstoreTransferFromInfo(tokenIn, amountIn, true, msg.sender);
+        _tstoreTransferFromInfo(tokenIn, amountIn, true);
         if (transferFromNeeded) {
             _transfer(tokenInReceiver);
         }

foundry/src/executors/EkuboExecutor.sol

@@ -12,6 +12,7 @@ import {LibBytes} from "@solady/utils/LibBytes.sol";
 import {Config, EkuboPoolKey} from "@ekubo/types/poolKey.sol";
 import {MAX_SQRT_RATIO, MIN_SQRT_RATIO} from "@ekubo/types/sqrtRatio.sol";
 import "../OneTransferFromOnly.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 contract EkuboExecutor is
     IExecutor,
@@ -204,11 +205,7 @@ contract EkuboExecutor is
         if (transferFromNeeded) {
             _transfer(msg.sender);
         } else if (transferNeeded) {
-            if (token == address(0)) {
-                payable(msg.sender).transfer(amount);
-            } else {
-                IERC20(token).safeTransfer(msg.sender, amount);
-            }
+            IERC20(token).safeTransfer(msg.sender, amount);
         }
     }
 

foundry/src/executors/MaverickV2Executor.sol

@@ -3,6 +3,7 @@ pragma solidity ^0.8.26;
 
 import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error MaverickV2Executor__InvalidDataLength();
 error MaverickV2Executor__InvalidTarget();
@@ -48,8 +49,7 @@ contract MaverickV2Executor is IExecutor {
 
         if (transferNeeded) {
             if (address(tokenIn) == address(0)) {
-                // slither-disable-next-line arbitrary-send-eth
-                payable(target).transfer(givenAmount);
+                Address.sendValue(payable(target), givenAmount);
             } else {
                 // slither-disable-next-line arbitrary-send-erc20
                 tokenIn.safeTransfer(target, givenAmount);

foundry/src/executors/UniswapV3Executor.sol

@@ -6,6 +6,7 @@ import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol";
 import "@interfaces/ICallback.sol";
 import {OneTransferFromOnly} from "../OneTransferFromOnly.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error UniswapV3Executor__InvalidDataLength();
 error UniswapV3Executor__InvalidFactory();
@@ -111,7 +112,7 @@ contract UniswapV3Executor is IExecutor, ICallback, OneTransferFromOnly {
             _transfer(msg.sender);
         } else if (transferNeeded) {
             if (tokenIn == address(0)) {
-                payable(msg.sender).transfer(amountOwed);
+                Address.sendValue(payable(msg.sender), amountOwed);
             } else {
                 IERC20(tokenIn).safeTransfer(msg.sender, amountOwed);
             }
@@ -169,7 +170,7 @@ contract UniswapV3Executor is IExecutor, ICallback, OneTransferFromOnly {
         uint24 fee,
         bool transferFromNeeded,
         bool transferNeeded
-    ) internal view returns (bytes memory) {
+    ) internal pure returns (bytes memory) {
         return abi.encodePacked(
             tokenIn, tokenOut, fee, transferFromNeeded, transferNeeded
         );

foundry/src/executors/UniswapV4Executor.sol

@@ -23,6 +23,7 @@ import {SafeCast} from "@uniswap/v4-core/src/libraries/SafeCast.sol";
 import {TransientStateLibrary} from
     "@uniswap/v4-core/src/libraries/TransientStateLibrary.sol";
 import "../OneTransferFromOnly.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error UniswapV4Executor__InvalidDataLength();
 error UniswapV4Executor__NotPoolManager();
@@ -410,14 +411,14 @@ contract UniswapV4Executor is
         } else {
             if (transferFromNeeded) {
                 // transferFrom swapper's wallet into the core contract
-                _transfer(msg.sender);
+                _transfer(address(poolManager));
             } else if (transferNeeded) {
                 address tokenIn = Currency.unwrap(currency);
                 // transfer from router contract into the core contract
                 if (tokenIn == address(0)) {
-                    payable(msg.sender).transfer(amount);
+                    Address.sendValue(payable(address(poolManager)), amount);
                 } else {
-                    IERC20(tokenIn).safeTransfer(msg.sender, amount);
+                    IERC20(tokenIn).safeTransfer(address(poolManager), amount);
                 }
             }
             // slither-disable-next-line unused-return