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// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "../interfaces/xDai/messengers/IArbitraryMessageBridge.sol";
import "./MessengerWrapper.sol";

/**
 * @dev A MessengerWrapper for xDai - https://www.xdaichain.com/ (also see https://docs.tokenbridge.net/)
 * @notice Deployed on layer-1
 */

contract XDaiMessengerWrapper is MessengerWrapper {

    IArbitraryMessageBridge public l1MessengerAddress;
    /// @notice The xDai AMB uses bytes32 for chainId instead of uint256
    bytes32 public l2ChainId;
    address public ambBridge;
    address public immutable l2BridgeAddress;
    uint256 public immutable defaultGasLimit;

    constructor(
        address _l1BridgeAddress,
        address _l2BridgeAddress,
        IArbitraryMessageBridge _l1MessengerAddress,
        uint256 _defaultGasLimit,
        uint256 _l2ChainId,
        address _ambBridge
    )
        public
        MessengerWrapper(_l1BridgeAddress)
    {
        l2BridgeAddress = _l2BridgeAddress;
        l1MessengerAddress = _l1MessengerAddress;
        defaultGasLimit = _defaultGasLimit;
        l2ChainId = bytes32(_l2ChainId);
        ambBridge = _ambBridge;
    }

    /**
     * @dev Sends a message to the l2BridgeAddress from layer-1
     * @param _calldata The data that l2BridgeAddress will be called with
     */
    function sendCrossDomainMessage(bytes memory _calldata) public override onlyL1Bridge {
        l1MessengerAddress.requireToPassMessage(
            l2BridgeAddress,
            _calldata,
            defaultGasLimit
        );
    }

    /// @notice message data is not needed for message verification with the xDai AMB
    function verifySender(address l1BridgeCaller, bytes memory) public override {
        require(l1MessengerAddress.messageSender() == l2BridgeAddress, "L2_XDAI_BRG: Invalid cross-domain sender");
        require(l1BridgeCaller == ambBridge, "L2_XDAI_BRG: Caller is not the expected sender");

        // With the xDai AMB, it is best practice to also check the source chainId
        // https://docs.tokenbridge.net/amb-bridge/how-to-develop-xchain-apps-by-amb#receive-a-method-call-from-the-amb-bridge
        require(l1MessengerAddress.messageSourceChainId() == l2ChainId, "L2_XDAI_BRG: Invalid source Chain ID");
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IArbitraryMessageBridge {
    function messageSender() external view returns (address);
    function maxGasPerTx() external view returns (uint256);
    function transactionHash() external view returns (bytes32);
    function messageId() external view returns (bytes32);
    function messageSourceChainId() external view returns (bytes32);
    function messageCallStatus(bytes32 _messageId) external view returns (bool);
    function failedMessageDataHash(bytes32 _messageId) external view returns (bytes32);
    function failedMessageReceiver(bytes32 _messageId) external view returns (address);
    function failedMessageSender(bytes32 _messageId) external view returns (address);
    function requireToPassMessage(address _contract, bytes memory _data, uint256 _gas) external returns (bytes32);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12 <0.8.0;
pragma experimental ABIEncoderV2;

import "../interfaces/IMessengerWrapper.sol";

abstract contract MessengerWrapper is IMessengerWrapper {
    address public immutable l1BridgeAddress;

    constructor(address _l1BridgeAddress) internal {
        l1BridgeAddress = _l1BridgeAddress;
    }

    modifier onlyL1Bridge {
        require(msg.sender == l1BridgeAddress, "MW: Sender must be the L1 Bridge");
        _;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12 <0.8.0;
pragma experimental ABIEncoderV2;

interface IMessengerWrapper {
    function sendCrossDomainMessage(bytes memory _calldata) external;
    function verifySender(address l1BridgeCaller, bytes memory _data) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 50000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_l1BridgeAddress","type":"address"},{"internalType":"address","name":"_l2BridgeAddress","type":"address"},{"internalType":"contract IArbitraryMessageBridge","name":"_l1MessengerAddress","type":"address"},{"internalType":"uint256","name":"_defaultGasLimit","type":"uint256"},{"internalType":"uint256","name":"_l2ChainId","type":"uint256"},{"internalType":"address","name":"_ambBridge","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ambBridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"defaultGasLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1BridgeAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1MessengerAddress","outputs":[{"internalType":"contract IArbitraryMessageBridge","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2BridgeAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ChainId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"sendCrossDomainMessage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"l1BridgeCaller","type":"address"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"verifySender","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000b8901acb165ed027e32754e0ffe830802919727f000000000000000000000000d8926c12c0b2e5cd40cfda49ecaff40252af491b0000000000000000000000004c36d2919e407f0cc2ee3c993ccf8ac26d9ce64e00000000000000000000000000000000000000000000000000000000000f424000000000000000000000000000000000000000000000000000000000000000640000000000000000000000004c36d2919e407f0cc2ee3c993ccf8ac26d9ce64e

-----Decoded View---------------
Arg [0] : _l1BridgeAddress (address): 0xb8901acB165ed027E32754E0FFe830802919727f
Arg [1] : _l2BridgeAddress (address): 0xD8926c12C0B2E5Cd40cFdA49eCaFf40252Af491B
Arg [2] : _l1MessengerAddress (address): 0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e
Arg [3] : _defaultGasLimit (uint256): 1000000
Arg [4] : _l2ChainId (uint256): 100
Arg [5] : _ambBridge (address): 0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000b8901acb165ed027e32754e0ffe830802919727f
Arg [1] : 000000000000000000000000d8926c12c0b2e5cd40cfda49ecaff40252af491b
Arg [2] : 0000000000000000000000004c36d2919e407f0cc2ee3c993ccf8ac26d9ce64e
Arg [3] : 00000000000000000000000000000000000000000000000000000000000f4240
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [5] : 0000000000000000000000004c36d2919e407f0cc2ee3c993ccf8ac26d9ce64e