feat: SuperchainWETHWrapper contract

contracts/script/DeployL2PeripheryContracts.s.sol

@@ -3,6 +3,7 @@ pragma solidity ^0.8.25;
 
 import {Script, console} from "forge-std/Script.sol";
 import {L2NativeSuperchainERC20} from "../src/L2NativeSuperchainERC20.sol";
+import {SuperchainETHWrapper} from "../src/SuperchainETHWrapper.sol";
 
 contract DeployL2PeripheryContracts is Script {
     /// @notice Used for tracking the next address to deploy a periphery contract at.
@@ -31,6 +32,7 @@ contract DeployL2PeripheryContracts is Script {
 
     function run() public broadcast {
         deployL2NativeSuperchainERC20();
+        deploySuperchainETHWrapper();
     }
 
     function deployL2NativeSuperchainERC20() public {
@@ -39,6 +41,12 @@ contract DeployL2PeripheryContracts is Script {
         console.log("Deployed L2NativeSuperchainERC20 at address: ", deploymentAddress);
     }
 
+    function deploySuperchainETHWrapper() public {
+        address _superchainETHWrapperContract = address(new SuperchainETHWrapper{salt: _salt()}());
+        address deploymentAddress = deployAtNextDeploymentAddress(_superchainETHWrapperContract.code);
+        console.log("Deployed SuperchainETHWrapper at address: ", deploymentAddress);
+    }
+
     function deployAtNextDeploymentAddress(bytes memory newRuntimeBytecode)
         internal
         returns (address _deploymentAddr)

contracts/src/SuperchainETHWrapper.sol

@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.15;
+
+import {Unauthorized} from "@contracts-bedrock/libraries/errors/CommonErrors.sol";
+import {Predeploys} from "@contracts-bedrock/libraries/Predeploys.sol";
+import {SafeCall} from "@contracts-bedrock//libraries/SafeCall.sol";
+import {IL2ToL2CrossDomainMessenger} from "@contracts-bedrock/L2/interfaces/IL2ToL2CrossDomainMessenger.sol";
+import {ISuperchainTokenBridge} from "@contracts-bedrock/L2/interfaces/ISuperchainTokenBridge.sol";
+import {ISuperchainWETH} from "@contracts-bedrock/L2/interfaces/ISuperchainWETH.sol";
+
+/**
+ * @notice Thrown when the relay of SuperchainWETH has not succeeded.
+ * @dev This error is triggered if the SuperchainWETH relay through the L2ToL2CrossDomainMessenger
+ *      has not completed successfully successful.
+ */
+error RelaySuperchainWETHNotSuccessful();
+
+/**
+ * @title SuperchainETHWrapper
+ * @notice This contract facilitates sending ETH across chains within the Superchain by wrapping
+ *         ETH into SuperchainWETH, relaying the wrapped asset to another chain, and then
+ *         unwrapping it back to ETH on the destination chain.
+ * @dev The contract integrates with the SuperchainWETH contract for wrapping and unwrapping ETH,
+ *      and uses the L2ToL2CrossDomainMessenger for relaying the wrapped ETH between chains.
+ */
+contract SuperchainETHWrapper {
+    /**
+     * @dev Emitted when ETH is received by the contract.
+     * @param from The address that sent ETH.
+     * @param value The amount of ETH received.
+     */
+    event LogReceived(address from, uint256 value);
+
+    // Fallback function to receive ETH
+    receive() external payable {
+        emit LogReceived(msg.sender, msg.value);
+    }
+
+    /**
+     * @notice Unwraps SuperchainWETH into native ETH and sends it to a specified destination address.
+     * @param _relayERC20MsgHash The hash of the relayed ERC20 message.
+     * @param _dst The destination address on the receiving chain.
+     * @param _wad The amount of SuperchainWETH to unwrap to ETH.
+     */
+    function unwrap(bytes32 _relayERC20MsgHash, address _dst, uint256 _wad) external {
+        IL2ToL2CrossDomainMessenger messenger = IL2ToL2CrossDomainMessenger(Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER);
+        if (msg.sender != address(messenger)) revert Unauthorized();
+        if (messenger.crossDomainMessageSender() != address(this)) revert Unauthorized();
+
+        if (messenger.successfulMessages(_relayERC20MsgHash) == false) {
+            revert RelaySuperchainWETHNotSuccessful();
+        }
+
+        ISuperchainWETH(Predeploys.SUPERCHAIN_WETH).withdraw(_wad);
+        SafeCall.call(_dst, _wad, hex"");
+    }
+
+    /**
+     * @notice Wraps ETH into SuperchainWETH and sends it to another chain.
+     * @dev This function wraps the sent ETH into SuperchainWETH, computes the relay message hash,
+     *      and relays the message to the destination chain.
+     * @param _dst The destination address on the receiving chain.
+     * @param _chainId The ID of the destination chain.
+     */
+    function sendETH(address _dst, uint256 _chainId) public payable {
+        ISuperchainWETH(Predeploys.SUPERCHAIN_WETH).deposit{value: msg.value}();
+        bytes32 messageHash = ISuperchainTokenBridge(Predeploys.SUPERCHAIN_TOKEN_BRIDGE).sendERC20(
+            Predeploys.SUPERCHAIN_WETH, address(this), msg.value, _chainId
+        );
+        IL2ToL2CrossDomainMessenger(Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER).sendMessage({
+            _destination: _chainId,
+            _target: address(this),
+            _message: abi.encodeCall(this.unwrap, (messageHash, _dst, msg.value))
+        });
+    }
+}

contracts/test/SuperchainETHWrapper.t.sol

@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.15;
+
+import {Test} from "forge-std/Test.sol";
+
+import {Unauthorized} from "@contracts-bedrock/libraries/errors/CommonErrors.sol";
+import {Predeploys} from "@contracts-bedrock/libraries/Predeploys.sol";
+import {IL2ToL2CrossDomainMessenger} from "@contracts-bedrock/L2/interfaces/IL2ToL2CrossDomainMessenger.sol";
+import {ISuperchainTokenBridge} from "@contracts-bedrock/L2/interfaces/ISuperchainTokenBridge.sol";
+import {ISuperchainWETH} from "@contracts-bedrock/L2/interfaces/ISuperchainWETH.sol";
+import {IWETH} from "@contracts-bedrock/universal/interfaces/IWETH.sol";
+import {SuperchainWETH} from "@contracts-bedrock/L2/SuperchainWETH.sol";
+
+import {SuperchainETHWrapper, RelaySuperchainWETHNotSuccessful} from "../src/SuperchainETHWrapper.sol";
+
+/// @title SuperchainETHWrapper Happy Path Tests
+/// @notice This contract contains the tests for successful paths in SuperchainETHWrapper.
+contract SuperchainETHWrapper_HappyPath_Test is Test {
+    SuperchainETHWrapper public superchainETHWrapper;
+
+    /// @notice Helper function to setup a mock and expect a call to it.
+    function _mockAndExpect(address _receiver, bytes memory _calldata, bytes memory _returned) internal {
+        vm.mockCall(_receiver, _calldata, _returned);
+        vm.expectCall(_receiver, _calldata);
+    }
+
+    /// @notice Helper function to setup a mock and expect a call to it.
+    function _mockAndExpect(address _receiver, uint256 _msgValue, bytes memory _calldata, bytes memory _returned)
+        internal
+    {
+        vm.mockCall(_receiver, _msgValue, _calldata, _returned);
+        vm.expectCall(_receiver, _msgValue, _calldata);
+    }
+
+    /// @notice Sets up the test suite.
+    function setUp() public {
+        superchainETHWrapper = new SuperchainETHWrapper();
+        SuperchainWETH superchainWETH = new SuperchainWETH();
+        vm.etch(Predeploys.SUPERCHAIN_WETH, address(superchainWETH).code);
+    }
+
+    /// @notice Tests the `sendETH` function deposits the sender's tokens, calls
+    /// SuperchainWETH.sendERC20, and sends an encoded call to
+    /// SuperchainETHWrapper.unwrap through L2ToL2CrossDomainMessenger.
+    function testFuzz_sendETH_succeeds(
+        address _sender,
+        address _to,
+        uint256 _amount,
+        uint256 _chainId,
+        bytes32 messageHash
+    ) public {
+        vm.assume(_chainId != block.chainid);
+        _amount = bound(_amount, 0, type(uint248).max - 1);
+        vm.deal(_sender, _amount);
+        _mockAndExpect(
+            Predeploys.SUPERCHAIN_WETH, _amount, abi.encodeWithSelector(IWETH.deposit.selector), abi.encode("")
+        );
+        _mockAndExpect(
+            Predeploys.SUPERCHAIN_TOKEN_BRIDGE,
+            abi.encodeCall(
+                ISuperchainTokenBridge.sendERC20,
+                (Predeploys.SUPERCHAIN_WETH, address(superchainETHWrapper), _amount, _chainId)
+            ),
+            abi.encode(messageHash)
+        );
+        bytes memory _message = abi.encodeCall(superchainETHWrapper.unwrap, (messageHash, _to, _amount));
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeWithSelector(
+                IL2ToL2CrossDomainMessenger.sendMessage.selector, _chainId, address(superchainETHWrapper), _message
+            ),
+            abi.encode("")
+        );
+
+        vm.prank(_sender);
+        superchainETHWrapper.sendETH{value: _amount}(_to, _chainId);
+    }
+
+    /**
+     * @notice Tests the successful execution of the `unwrap` function.
+     * @dev This test mocks the `crossDomainMessageSender` and `successfulMessages` function calls
+     *      to simulate the proper cross-domain message behavior.
+     * @param _to Address receiving the unwrapped ETH.
+     * @param _amount Amount of ETH to be unwrapped and sent.
+     * @param _relayERC20MsgHash Hash of the relayed message.
+     */
+    function testFuzz_unwrap_succeeds(address _to, uint256 _amount, bytes32 _relayERC20MsgHash) public {
+        _amount = bound(_amount, 0, type(uint248).max - 1);
+        // Ensure that the target contract is not a Forge contract.
+        assumeNotForgeAddress(_to);
+        // Ensure that the target call is payable if value is sent
+        assumePayable(_to);
+        uint256 prevBalance = _to.balance;
+
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeWithSelector(IL2ToL2CrossDomainMessenger.crossDomainMessageSender.selector),
+            abi.encode(address(superchainETHWrapper))
+        );
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeCall(IL2ToL2CrossDomainMessenger.successfulMessages, (_relayERC20MsgHash)),
+            abi.encode(true)
+        );
+        _mockAndExpect(
+            Predeploys.SUPERCHAIN_WETH,
+            abi.encodeCall(ISuperchainWETH(Predeploys.SUPERCHAIN_WETH).withdraw, (_amount)),
+            abi.encode("")
+        );
+        // Simulates the withdrawal being sent to the SuperchainETHWrapper contract.
+        vm.deal(address(superchainETHWrapper), _amount);
+
+        vm.prank(Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER);
+        superchainETHWrapper.unwrap(_relayERC20MsgHash, _to, _amount);
+        assertEq(_to.balance - prevBalance, _amount);
+    }
+}
+
+/// @title SuperchainETHWrapper Revert Tests
+/// @notice This contract contains tests to check that certain conditions result in expected
+///         reverts.
+contract SuperchainETHWrapperRevertTests is Test {
+    SuperchainETHWrapper public superchainETHWrapper;
+
+    /// @notice Helper function to setup a mock and expect a call to it.
+    function _mockAndExpect(address _receiver, bytes memory _calldata, bytes memory _returned) internal {
+        vm.mockCall(_receiver, _calldata, _returned);
+        vm.expectCall(_receiver, _calldata);
+    }
+
+    /// @notice Sets up the test suite.
+    function setUp() public {
+        superchainETHWrapper = new SuperchainETHWrapper();
+    }
+
+    /**
+     * @notice Tests that the `unwrap` function reverts when the message is unrelayed.
+     * @dev Mocks the cross-domain message sender and sets `successfulMessages` to return `false`,
+     *      triggering a revert when trying to call `unwrap`.
+     * @param _to Address receiving the unwrapped ETH.
+     * @param _amount Amount of ETH to be unwrapped.
+     * @param _relayERC20MsgHash Hash of the relayed message.
+     */
+    function testFuzz_unwrap_fromUnrelayedMsgHash_reverts(address _to, uint256 _amount, bytes32 _relayERC20MsgHash)
+        public
+    {
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeWithSelector(IL2ToL2CrossDomainMessenger.crossDomainMessageSender.selector),
+            abi.encode(address(superchainETHWrapper))
+        );
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeCall(IL2ToL2CrossDomainMessenger.successfulMessages, (_relayERC20MsgHash)),
+            abi.encode(false)
+        );
+
+        vm.prank(Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER);
+        vm.expectRevert(RelaySuperchainWETHNotSuccessful.selector);
+        superchainETHWrapper.unwrap(_relayERC20MsgHash, _to, _amount);
+    }
+
+    /**
+     * @notice Tests that the `unwrap` function reverts when the sender is not the expected messenger.
+     * @dev Mocks an invalid sender (not the messenger) to ensure the function reverts with the
+     *      `Unauthorized` error.
+     * @param _sender Address that tries to call `unwrap` but is not the messenger.
+     * @param _to Address receiving the unwrapped ETH.
+     * @param _amount Amount of ETH to be unwrapped.
+     * @param _relayERC20MsgHash Hash of the relayed message.
+     */
+    function testFuzz_unwrap_nonMessengerSender_reverts(
+        address _sender,
+        address _to,
+        uint256 _amount,
+        bytes32 _relayERC20MsgHash
+    ) public {
+        vm.assume(_sender != Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER);
+
+        vm.prank(_sender);
+        vm.expectRevert(Unauthorized.selector);
+        superchainETHWrapper.unwrap(_relayERC20MsgHash, _to, _amount);
+    }
+
+    /**
+     * @notice Tests that the `unwrap` function reverts when the cross-domain message sender is
+     *         not the SuperchainETHWrapper contract.
+     * @dev Mocks a wrong cross-domain message sender and ensures the function reverts with the
+     *      `Unauthorized` error.
+     * @param _sender Address that tries to call `unwrap` but is not the correct message sender.
+     * @param _to Address receiving the unwrapped ETH.
+     * @param _amount Amount of ETH to be unwrapped.
+     * @param _relayERC20MsgHash Hash of the relayed message.
+     */
+    function testFuzz_unwrap_wrongCrossDomainMessageSender_reverts(
+        address _sender,
+        address _to,
+        uint256 _amount,
+        bytes32 _relayERC20MsgHash
+    ) public {
+        vm.assume(_sender != address(superchainETHWrapper));
+
+        _mockAndExpect(
+            Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER,
+            abi.encodeWithSelector(IL2ToL2CrossDomainMessenger.crossDomainMessageSender.selector),
+            abi.encode(_sender)
+        );
+
+        vm.prank(Predeploys.L2_TO_L2_CROSS_DOMAIN_MESSENGER);
+        vm.expectRevert(Unauthorized.selector);
+        superchainETHWrapper.unwrap(_relayERC20MsgHash, _to, _amount);
+    }
+}