L2WETHGateway.t.sol

// SPDX-License-Identifier: MIT

pragma solidity =0.8.16;

import {WETH} from "solmate/tokens/WETH.sol";

import {ERC1967Proxy} from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";

import {IL1ERC20Gateway, L1WETHGateway} from "../L1/gateways/L1WETHGateway.sol";
import {L2GatewayRouter} from "../L2/gateways/L2GatewayRouter.sol";
import {IL2ERC20Gateway, L2WETHGateway} from "../L2/gateways/L2WETHGateway.sol";

import {AddressAliasHelper} from "../libraries/common/AddressAliasHelper.sol";

import {L2GatewayTestBase} from "./L2GatewayTestBase.t.sol";
import {MockScrollMessenger} from "./mocks/MockScrollMessenger.sol";
import {MockGatewayRecipient} from "./mocks/MockGatewayRecipient.sol";

contract L2WETHGatewayTest is L2GatewayTestBase {
    // from L2WETHGateway
    event WithdrawERC20(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );
    event FinalizeDepositERC20(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    WETH private l1weth;
    WETH private l2weth;

    L2WETHGateway private gateway;
    L2GatewayRouter private router;

    L1WETHGateway private counterpartGateway;

    function setUp() public {
        setUpBase();

        // Deploy tokens
        l1weth = new WETH();
        l2weth = new WETH();

        // Deploy L2 contracts
        gateway = _deployGateway();
        router = L2GatewayRouter(address(new ERC1967Proxy(address(new L2GatewayRouter()), new bytes(0))));

        // Deploy L1 contracts
        counterpartGateway = new L1WETHGateway(address(l1weth), address(l2weth));

        // Initialize L2 contracts
        gateway.initialize(address(counterpartGateway), address(router), address(l2Messenger));
        router.initialize(address(0), address(gateway));

        // Prepare token balances
        l2weth.deposit{value: address(this).balance / 2}();
        l2weth.approve(address(gateway), type(uint256).max);
    }

    function testInitialized() public {
        assertEq(address(counterpartGateway), gateway.counterpart());
        assertEq(address(router), gateway.router());
        assertEq(address(l2Messenger), gateway.messenger());
        assertEq(address(l2weth), gateway.WETH());
        assertEq(address(l1weth), gateway.l1WETH());
        assertEq(address(l1weth), gateway.getL1ERC20Address(address(l2weth)));
        assertEq(address(l2weth), gateway.getL2ERC20Address(address(l1weth)));

        hevm.expectRevert("Initializable: contract is already initialized");
        gateway.initialize(address(counterpartGateway), address(router), address(l2Messenger));
    }

    function testDirectTransferETH(uint256 amount) public {
        amount = bound(amount, 0, address(this).balance);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory result) = address(gateway).call{value: amount}("");
        assertBoolEq(success, false);
        assertEq(string(result), string(abi.encodeWithSignature("Error(string)", "only WETH")));
    }

    function testWithdrawERC20(
        uint256 amount,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20(false, amount, gasLimit, feePerGas);
    }

    function testWithdrawERC20WithRecipient(
        uint256 amount,
        address recipient,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20WithRecipient(false, amount, recipient, gasLimit, feePerGas);
    }

    function testWithdrawERC20WithRecipientAndCalldata(
        uint256 amount,
        address recipient,
        bytes memory dataToCall,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20WithRecipientAndCalldata(false, amount, recipient, dataToCall, gasLimit, feePerGas);
    }

    function testRouterDepositERC20(
        uint256 amount,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20(true, amount, gasLimit, feePerGas);
    }

    function testRouterDepositERC20WithRecipient(
        uint256 amount,
        address recipient,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20WithRecipient(true, amount, recipient, gasLimit, feePerGas);
    }

    function testRouterDepositERC20WithRecipientAndCalldata(
        uint256 amount,
        address recipient,
        bytes memory dataToCall,
        uint256 gasLimit,
        uint256 feePerGas
    ) public {
        _withdrawERC20WithRecipientAndCalldata(true, amount, recipient, dataToCall, gasLimit, feePerGas);
    }

    function testFinalizeDepositERC20FailedMocking(
        address sender,
        address recipient,
        uint256 amount,
        bytes memory dataToCall
    ) public {
        amount = bound(amount, 1, 100000);

        // revert when caller is not messenger
        hevm.expectRevert("only messenger can call");
        gateway.finalizeDepositERC20(address(l1weth), address(l2weth), sender, recipient, amount, dataToCall);

        MockScrollMessenger mockMessenger = new MockScrollMessenger();
        gateway = _deployGateway();
        gateway.initialize(address(counterpartGateway), address(router), address(mockMessenger));

        // only call by counterpart
        hevm.expectRevert("only call by counterpart");
        mockMessenger.callTarget(
            address(gateway),
            abi.encodeWithSelector(
                gateway.finalizeDepositERC20.selector,
                address(l1weth),
                address(l2weth),
                sender,
                recipient,
                amount,
                dataToCall
            )
        );

        mockMessenger.setXDomainMessageSender(address(counterpartGateway));

        // l1 token not WETH
        hevm.expectRevert("l1 token not WETH");
        mockMessenger.callTarget(
            address(gateway),
            abi.encodeWithSelector(
                gateway.finalizeDepositERC20.selector,
                address(l2weth),
                address(l2weth),
                sender,
                recipient,
                amount,
                dataToCall
            )
        );

        // l2 token not WETH
        hevm.expectRevert("l2 token not WETH");
        mockMessenger.callTarget(
            address(gateway),
            abi.encodeWithSelector(
                gateway.finalizeDepositERC20.selector,
                address(l1weth),
                address(l1weth),
                sender,
                recipient,
                amount,
                dataToCall
            )
        );

        // msg.value mismatch
        hevm.expectRevert("msg.value mismatch");
        mockMessenger.callTarget(
            address(gateway),
            abi.encodeWithSelector(
                gateway.finalizeDepositERC20.selector,
                address(l1weth),
                address(l2weth),
                sender,
                recipient,
                amount,
                dataToCall
            )
        );
    }

    function testFinalizeDepositERC20Failed(
        address sender,
        address recipient,
        uint256 amount,
        bytes memory dataToCall
    ) public {
        // blacklist some addresses
        hevm.assume(recipient != address(0));
        hevm.assume(recipient != address(gateway));

        amount = bound(amount, 1, l2weth.balanceOf(address(this)));

        // send some WETH to L2ScrollMessenger
        gateway.withdrawERC20(address(l2weth), amount, 21000);

        // do finalize withdraw eth
        bytes memory message = abi.encodeWithSelector(
            IL2ERC20Gateway.finalizeDepositERC20.selector,
            address(l1weth),
            address(l2weth),
            sender,
            recipient,
            amount,
            dataToCall
        );
        bytes memory xDomainCalldata = abi.encodeWithSignature(
            "relayMessage(address,address,uint256,uint256,bytes)",
            address(uint160(address(counterpartGateway)) + 1),
            address(gateway),
            amount,
            0,
            message
        );

        // counterpart is not L1WETHGateway
        // emit FailedRelayedMessage from L2ScrollMessenger
        hevm.expectEmit(true, false, false, true);
        emit FailedRelayedMessage(keccak256(xDomainCalldata));

        uint256 messengerBalance = address(l2Messenger).balance;
        uint256 recipientBalance = l2weth.balanceOf(recipient);
        assertBoolEq(false, l2Messenger.isL1MessageExecuted(keccak256(xDomainCalldata)));
        hevm.startPrank(AddressAliasHelper.applyL1ToL2Alias(address(l1Messenger)));
        l2Messenger.relayMessage(
            address(uint160(address(counterpartGateway)) + 1),
            address(gateway),
            amount,
            0,
            message
        );
        hevm.stopPrank();
        assertEq(messengerBalance, address(l2Messenger).balance);
        assertEq(recipientBalance, l2weth.balanceOf(recipient));
        assertBoolEq(false, l2Messenger.isL1MessageExecuted(keccak256(xDomainCalldata)));
    }

    function testFinalizeDepositERC20(
        address sender,
        uint256 amount,
        bytes memory dataToCall
    ) public {
        MockGatewayRecipient recipient = new MockGatewayRecipient();

        amount = bound(amount, 1, l2weth.balanceOf(address(this)));

        // send some WETH to L1ScrollMessenger
        gateway.withdrawERC20(address(l2weth), amount, 21000);

        // do finalize withdraw weth
        bytes memory message = abi.encodeWithSelector(
            IL2ERC20Gateway.finalizeDepositERC20.selector,
            address(l1weth),
            address(l2weth),
            sender,
            address(recipient),
            amount,
            dataToCall
        );
        bytes memory xDomainCalldata = abi.encodeWithSignature(
            "relayMessage(address,address,uint256,uint256,bytes)",
            address(counterpartGateway),
            address(gateway),
            amount,
            0,
            message
        );

        // emit FinalizeDepositERC20 from L2WETHGateway
        {
            hevm.expectEmit(true, true, true, true);
            emit FinalizeDepositERC20(address(l1weth), address(l2weth), sender, address(recipient), amount, dataToCall);
        }

        // emit RelayedMessage from L2ScrollMessenger
        {
            hevm.expectEmit(true, false, false, true);
            emit RelayedMessage(keccak256(xDomainCalldata));
        }

        uint256 messengerBalance = address(l2Messenger).balance;
        uint256 recipientBalance = l2weth.balanceOf(address(recipient));
        assertBoolEq(false, l2Messenger.isL1MessageExecuted(keccak256(xDomainCalldata)));
        hevm.startPrank(AddressAliasHelper.applyL1ToL2Alias(address(l1Messenger)));
        l2Messenger.relayMessage(address(counterpartGateway), address(gateway), amount, 0, message);
        hevm.stopPrank();
        assertEq(messengerBalance - amount, address(l2Messenger).balance);
        assertEq(recipientBalance + amount, l2weth.balanceOf(address(recipient)));
        assertBoolEq(true, l2Messenger.isL1MessageExecuted(keccak256(xDomainCalldata)));
    }

    function _withdrawERC20(
        bool useRouter,
        uint256 amount,
        uint256 gasLimit,
        uint256 feePerGas
    ) private {
        amount = bound(amount, 0, l2weth.balanceOf(address(this)));
        gasLimit = bound(gasLimit, 21000, 1000000);
        feePerGas = 0;

        setL1BaseFee(feePerGas);

        uint256 feeToPay = feePerGas * gasLimit;
        bytes memory message = abi.encodeWithSelector(
            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
            address(l1weth),
            address(l2weth),
            address(this),
            address(this),
            amount,
            new bytes(0)
        );
        bytes memory xDomainCalldata = abi.encodeWithSignature(
            "relayMessage(address,address,uint256,uint256,bytes)",
            address(gateway),
            address(counterpartGateway),
            amount,
            0,
            message
        );

        if (amount == 0) {
            hevm.expectRevert("withdraw zero amount");
            if (useRouter) {
                router.withdrawERC20{value: feeToPay}(address(l2weth), amount, gasLimit);
            } else {
                gateway.withdrawERC20{value: feeToPay}(address(l2weth), amount, gasLimit);
            }
        } else {
            // token is not l2WETH
            hevm.expectRevert("only WETH is allowed");
            gateway.withdrawERC20(address(l1weth), amount, gasLimit);

            // emit AppendMessage from L2MessageQueue
            {
                hevm.expectEmit(false, false, false, true);
                emit AppendMessage(0, keccak256(xDomainCalldata));
            }

            // emit SentMessage from L2ScrollMessenger
            {
                hevm.expectEmit(true, true, false, true);
                emit SentMessage(address(gateway), address(counterpartGateway), amount, 0, gasLimit, message);
            }

            // emit WithdrawERC20 from L2WETHGateway
            hevm.expectEmit(true, true, true, true);
            emit WithdrawERC20(address(l1weth), address(l2weth), address(this), address(this), amount, new bytes(0));

            uint256 messengerBalance = address(l2Messenger).balance;
            uint256 feeVaultBalance = address(feeVault).balance;
            assertEq(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
            if (useRouter) {
                router.withdrawERC20{value: feeToPay}(address(l2weth), amount, gasLimit);
            } else {
                gateway.withdrawERC20{value: feeToPay}(address(l2weth), amount, gasLimit);
            }
            assertEq(amount + messengerBalance, address(l2Messenger).balance);
            assertEq(feeToPay + feeVaultBalance, address(feeVault).balance);
            assertGt(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
        }
    }

    function _withdrawERC20WithRecipient(
        bool useRouter,
        uint256 amount,
        address recipient,
        uint256 gasLimit,
        uint256 feePerGas
    ) private {
        amount = bound(amount, 0, l2weth.balanceOf(address(this)));
        gasLimit = bound(gasLimit, 21000, 1000000);
        feePerGas = 0;

        setL1BaseFee(feePerGas);

        uint256 feeToPay = feePerGas * gasLimit;
        bytes memory message = abi.encodeWithSelector(
            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
            address(l1weth),
            address(l2weth),
            address(this),
            recipient,
            amount,
            new bytes(0)
        );
        bytes memory xDomainCalldata = abi.encodeWithSignature(
            "relayMessage(address,address,uint256,uint256,bytes)",
            address(gateway),
            address(counterpartGateway),
            amount,
            0,
            message
        );

        if (amount == 0) {
            hevm.expectRevert("withdraw zero amount");
            if (useRouter) {
                router.withdrawERC20{value: feeToPay}(address(l2weth), recipient, amount, gasLimit);
            } else {
                gateway.withdrawERC20{value: feeToPay}(address(l2weth), recipient, amount, gasLimit);
            }
        } else {
            // token is not l1WETH
            hevm.expectRevert("only WETH is allowed");
            gateway.withdrawERC20(address(l1weth), recipient, amount, gasLimit);

            // emit AppendMessage from L2MessageQueue
            {
                hevm.expectEmit(false, false, false, true);
                emit AppendMessage(0, keccak256(xDomainCalldata));
            }

            // emit SentMessage from L2ScrollMessenger
            {
                hevm.expectEmit(true, true, false, true);
                emit SentMessage(address(gateway), address(counterpartGateway), amount, 0, gasLimit, message);
            }

            // emit WithdrawERC20 from L2WETHGateway
            hevm.expectEmit(true, true, true, true);
            emit WithdrawERC20(address(l1weth), address(l2weth), address(this), recipient, amount, new bytes(0));

            uint256 messengerBalance = address(l2Messenger).balance;
            uint256 feeVaultBalance = address(feeVault).balance;
            assertEq(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
            if (useRouter) {
                router.withdrawERC20{value: feeToPay}(address(l2weth), recipient, amount, gasLimit);
            } else {
                gateway.withdrawERC20{value: feeToPay}(address(l2weth), recipient, amount, gasLimit);
            }
            assertEq(amount + messengerBalance, address(l2Messenger).balance);
            assertEq(feeToPay + feeVaultBalance, address(feeVault).balance);
            assertGt(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
        }
    }

    function _withdrawERC20WithRecipientAndCalldata(
        bool useRouter,
        uint256 amount,
        address recipient,
        bytes memory dataToCall,
        uint256 gasLimit,
        uint256 feePerGas
    ) private {
        amount = bound(amount, 0, l2weth.balanceOf(address(this)));
        gasLimit = bound(gasLimit, 21000, 1000000);
        feePerGas = 0;

        setL1BaseFee(feePerGas);

        uint256 feeToPay = feePerGas * gasLimit;
        bytes memory message = abi.encodeWithSelector(
            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
            address(l1weth),
            address(l2weth),
            address(this),
            recipient,
            amount,
            dataToCall
        );
        bytes memory xDomainCalldata = abi.encodeWithSignature(
            "relayMessage(address,address,uint256,uint256,bytes)",
            address(gateway),
            address(counterpartGateway),
            amount,
            0,
            message
        );

        if (amount == 0) {
            hevm.expectRevert("withdraw zero amount");
            if (useRouter) {
                router.withdrawERC20AndCall{value: feeToPay}(address(l2weth), recipient, amount, dataToCall, gasLimit);
            } else {
                gateway.withdrawERC20AndCall{value: feeToPay}(address(l2weth), recipient, amount, dataToCall, gasLimit);
            }
        } else {
            // token is not l1WETH
            hevm.expectRevert("only WETH is allowed");
            gateway.withdrawERC20AndCall(address(l1weth), recipient, amount, dataToCall, gasLimit);

            // emit AppendMessage from L2MessageQueue
            {
                hevm.expectEmit(false, false, false, true);
                emit AppendMessage(0, keccak256(xDomainCalldata));
            }

            // emit SentMessage from L2ScrollMessenger
            {
                hevm.expectEmit(true, true, false, true);
                emit SentMessage(address(gateway), address(counterpartGateway), amount, 0, gasLimit, message);
            }

            // emit WithdrawERC20 from L2WETHGateway
            hevm.expectEmit(true, true, true, true);
            emit WithdrawERC20(address(l1weth), address(l2weth), address(this), recipient, amount, dataToCall);

            uint256 messengerBalance = address(l2Messenger).balance;
            uint256 feeVaultBalance = address(feeVault).balance;
            assertEq(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
            if (useRouter) {
                router.withdrawERC20AndCall{value: feeToPay}(address(l2weth), recipient, amount, dataToCall, gasLimit);
            } else {
                gateway.withdrawERC20AndCall{value: feeToPay}(address(l2weth), recipient, amount, dataToCall, gasLimit);
            }
            assertEq(amount + messengerBalance, address(l2Messenger).balance);
            assertEq(feeToPay + feeVaultBalance, address(feeVault).balance);
            assertGt(l2Messenger.messageSendTimestamp(keccak256(xDomainCalldata)), 0);
        }
    }

    function _deployGateway() internal returns (L2WETHGateway) {
        return
            L2WETHGateway(
                payable(new ERC1967Proxy(address(new L2WETHGateway(address(l2weth), address(l1weth))), new bytes(0)))
            );
    }
}