feat: UniswapXFiller skeleton

foundry/src/uniswap_x/UniswapXFiller.sol

@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.26;
+
+import "./IReactor.sol";
+import "./IReactorCallback.sol";
+import {
+    SafeERC20,
+    IERC20
+} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@openzeppelin/contracts/access/AccessControl.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
+
+error UniswapXFiller__AddressZero();
+
+contract UniswapXFiller is AccessControl, IReactorCallback {
+    using SafeERC20 for IERC20;
+
+    // UniswapX V2DutchOrder Reactor
+    IReactor public constant USXEDAReactor =
+        IReactor(0x00000011F84B9aa48e5f8aA8B9897600006289Be);
+    address public immutable tychoRouter;
+
+    // keccak256("NAME_OF_ROLE") : save gas on deployment
+    bytes32 public constant REACTOR_ROLE =
+        0x39dd1d7269516fc1f719706a5e9b05cdcb1644978808b171257d9a8eab55dd57;
+    bytes32 public constant EXECUTOR_ROLE =
+        0xd8aa0f3194971a2a116679f7c2090f6939c8d4e01a2a8d7e41d55e5351469e63;
+
+    event Withdrawal(
+        address indexed token, uint256 amount, address indexed receiver
+    );
+
+    constructor(address _tychoRouter) {
+        if (_tychoRouter == address(0)) revert UniswapXFiller__AddressZero();
+
+        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
+        _grantRole(REACTOR_ROLE, address(USXEDAReactor));
+        tychoRouter = _tychoRouter;
+    }
+
+    function execute(SignedOrder calldata order, bytes calldata callbackData)
+        external
+        onlyRole(EXECUTOR_ROLE)
+    {
+        USXEDAReactor.executeWithCallback(order, callbackData);
+    }
+
+    function reactorCallback(
+        ResolvedOrder[] calldata resolvedOrders,
+        bytes calldata callbackData
+    ) external onlyRole(REACTOR_ROLE) {
+        // TODO
+    }
+
+    /**
+     * @dev Allows granting roles to multiple accounts in a single call.
+     */
+    function batchGrantRole(bytes32 role, address[] memory accounts)
+        external
+        onlyRole(DEFAULT_ADMIN_ROLE)
+    {
+        for (uint256 i = 0; i < accounts.length; i++) {
+            _grantRole(role, accounts[i]);
+        }
+    }
+
+    /**
+     * @dev Allows withdrawing any ERC20 funds if funds get stuck in case of a bug.
+     */
+    function withdraw(IERC20[] memory tokens, address receiver)
+        external
+        onlyRole(DEFAULT_ADMIN_ROLE)
+    {
+        if (receiver == address(0)) revert UniswapXFiller__AddressZero();
+
+        for (uint256 i = 0; i < tokens.length; i++) {
+            // slither-disable-next-line calls-loop
+            uint256 tokenBalance = tokens[i].balanceOf(address(this));
+            if (tokenBalance > 0) {
+                emit Withdrawal(address(tokens[i]), tokenBalance, receiver);
+                tokens[i].safeTransfer(receiver, tokenBalance);
+            }
+        }
+    }
+
+    /**
+     * @dev Allows withdrawing any NATIVE funds if funds get stuck in case of a bug.
+     * The contract should never hold any NATIVE tokens for security reasons.
+     */
+    function withdrawNative(address receiver)
+        external
+        onlyRole(DEFAULT_ADMIN_ROLE)
+    {
+        if (receiver == address(0)) revert UniswapXFiller__AddressZero();
+
+        uint256 amount = address(this).balance;
+        if (amount > 0) {
+            emit Withdrawal(address(0), amount, receiver);
+            Address.sendValue(payable(receiver), amount);
+        }
+    }
+
+    /**
+     * @dev Allows this contract to receive native token with empty msg.data from contracts
+     */
+    receive() external payable {
+        require(msg.sender.code.length != 0);
+    }
+}