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// SPDX-License-Identifier: MIT

pragma solidity =0.8.16;

import {AppendOnlyMerkleTree} from "../../libraries/common/AppendOnlyMerkleTree.sol";
import {OwnableBase} from "../../libraries/common/OwnableBase.sol";

/// @title L2MessageQueue
/// @notice The original idea is from Optimism, see [OVM_L2ToL1MessagePasser](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/L2/predeploys/OVM_L2ToL1MessagePasser.sol).
/// The L2 to L1 Message Passer is a utility contract which facilitate an L1 proof of the
/// of a message on L2. The L1 Cross Domain Messenger performs this proof in its
/// _verifyStorageProof function, which verifies the existence of the transaction hash in this
/// contract's `sentMessages` mapping.
contract L2MessageQueue is AppendOnlyMerkleTree, OwnableBase {
    /**********
     * Events *
     **********/

    /// @notice Emitted when a new message is added to the merkle tree.
    /// @param index The index of the corresponding message.
    /// @param messageHash The hash of the corresponding message.
    event AppendMessage(uint256 index, bytes32 messageHash);

    /*************
     * Variables *
     *************/

    /// @notice The address of L2ScrollMessenger contract.
    address public messenger;

    /***************
     * Constructor *
     ***************/

    constructor(address _owner) {
        _transferOwnership(_owner);
    }

    /// @notice Initialize the state of `L2MessageQueue`
    /// @dev You are not allowed to initialize when there are some messages appended.
    /// @param _messenger The address of messenger to update.
    function initialize(address _messenger) external onlyOwner {
        require(nextMessageIndex == 0, "cannot initialize");

        _initializeMerkleTree();

        messenger = _messenger;
    }

    /*****************************
     * Public Mutating Functions *
     *****************************/

    /// @notice record the message to merkle tree and compute the new root.
    /// @param _messageHash The hash of the new added message.
    function appendMessage(bytes32 _messageHash) external returns (bytes32) {
        require(msg.sender == messenger, "only messenger");

        (uint256 _currentNonce, bytes32 _currentRoot) = _appendMessageHash(_messageHash);

        // We can use the event to compute the merkle tree locally.
        emit AppendMessage(_currentNonce, _messageHash);

        return _currentRoot;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

abstract contract AppendOnlyMerkleTree {
    /// @dev The maximum height of the withdraw merkle tree.
    uint256 private constant MAX_TREE_HEIGHT = 40;

    /// @notice The merkle root of the current merkle tree.
    /// @dev This is actual equal to `branches[n]`.
    bytes32 public messageRoot;

    /// @notice The next unused message index.
    uint256 public nextMessageIndex;

    /// @notice The list of zero hash in each height.
    bytes32[MAX_TREE_HEIGHT] private zeroHashes;

    /// @notice The list of minimum merkle proofs needed to compute next root.
    /// @dev Only first `n` elements are used, where `n` is the minimum value that `2^{n-1} >= currentMaxNonce + 1`.
    /// It means we only use `currentMaxNonce + 1` leaf nodes to construct the merkle tree.
    bytes32[MAX_TREE_HEIGHT] public branches;

    function _initializeMerkleTree() internal {
        // Compute hashes in empty sparse Merkle tree
        for (uint256 height = 0; height + 1 < MAX_TREE_HEIGHT; height++) {
            zeroHashes[height + 1] = _efficientHash(zeroHashes[height], zeroHashes[height]);
        }
    }

    function _appendMessageHash(bytes32 _messageHash) internal returns (uint256, bytes32) {
        require(zeroHashes[1] != bytes32(0), "call before initialization");

        uint256 _currentMessageIndex = nextMessageIndex;
        bytes32 _hash = _messageHash;
        uint256 _height = 0;

        while (_currentMessageIndex != 0) {
            if (_currentMessageIndex % 2 == 0) {
                // it may be used in next round.
                branches[_height] = _hash;
                // it's a left child, the right child must be null
                _hash = _efficientHash(_hash, zeroHashes[_height]);
            } else {
                // it's a right child, use previously computed hash
                _hash = _efficientHash(branches[_height], _hash);
            }
            unchecked {
                _height += 1;
            }
            _currentMessageIndex >>= 1;
        }

        branches[_height] = _hash;
        messageRoot = _hash;

        _currentMessageIndex = nextMessageIndex;
        unchecked {
            nextMessageIndex = _currentMessageIndex + 1;
        }

        return (_currentMessageIndex, _hash);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

abstract contract OwnableBase {
    /**********
     * Events *
     **********/

    /// @notice Emitted when owner is changed by current owner.
    /// @param _oldOwner The address of previous owner.
    /// @param _newOwner The address of new owner.
    event OwnershipTransferred(address indexed _oldOwner, address indexed _newOwner);

    /*************
     * Variables *
     *************/

    /// @notice The address of the current owner.
    address public owner;

    /**********************
     * Function Modifiers *
     **********************/

    /// @dev Throws if called by any account other than the owner.
    modifier onlyOwner() {
        require(owner == msg.sender, "caller is not the owner");
        _;
    }

    /************************
     * Restricted Functions *
     ************************/

    /// @notice Leaves the contract without owner. It will not be possible to call
    /// `onlyOwner` functions anymore. Can only be called by the current owner.
    ///
    /// @dev Renouncing ownership will leave the contract without an owner,
    /// thereby removing any functionality that is only available to the owner.
    function renounceOwnership() public onlyOwner {
        _transferOwnership(address(0));
    }

    /// @notice Transfers ownership of the contract to a new account (`newOwner`).
    /// Can only be called by the current owner.
    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != address(0), "new owner is the zero address");
        _transferOwnership(_newOwner);
    }

    /**********************
     * Internal Functions *
     **********************/

    /// @dev Transfers ownership of the contract to a new account (`newOwner`).
    /// Internal function without access restriction.
    function _transferOwnership(address _newOwner) internal {
        address _oldOwner = owner;
        owner = _newOwner;
        emit OwnershipTransferred(_oldOwner, _newOwner);
    }
}

{
  "remappings": [
    "@openzeppelin/=node_modules/@openzeppelin/",
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "hardhat/=node_modules/hardhat/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "": [
        "ast"
      ],
      "*": [
        "abi",
        "evm.bytecode",
        "evm.deployedBytecode",
        "evm.methodIdentifiers",
        "metadata"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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