// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./Governance.sol";
import "./libraries/external/RLPReader.sol";
import "./interfaces/IZKBridgeEntrypoint.sol";
import "./interfaces/IZKBridgeReceiver.sol";
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Upgrade.sol";

contract ZKBridge is Governance, IZKBridgeEntrypoint {
    using RLPReader for RLPReader.RLPItem;
    using RLPReader for bytes;

    bytes32 public constant MESSAGE_TOPIC = 0xb8abfd5c33667c7440a4fc1153ae39a24833dbe44f7eb19cbe5cd5f2583e4940;

    struct LogMessage {
        uint16 dstChainId;
        uint64 sequence;
        address dstAddress;
        bytes32 srcAddress;
        bytes32 srcZkBridge;
        bytes payload;
    }

    modifier initializer() {
        address implementation = ERC1967Upgrade._getImplementation();
        require(!isInitialized(implementation), "already initialized");
        _setInitialized(implementation);
        _;
    }

    function initialize() initializer public virtual {
        // this function needs to be exposed for an upgrade to pass
    }

    function send(uint16 dstChainId, address dstAddress, bytes memory payload) external payable returns (uint64 sequence) {
        require(dstChainId != chainId(), "Cannot send to same chain");
        sequence = _useSequence(chainId(), msg.sender);
        emit MessagePublished(msg.sender, dstChainId, sequence, dstAddress, payload);
    }

    function validateTransactionProof(uint16 srcChainId, bytes32 srcBlockHash, uint256 logIndex, bytes memory mptProof) external {
        IMptVerifier mptVerifier = mptVerifier(srcChainId);
        IBlockUpdater blockUpdater = blockUpdater(srcChainId);
        require(address(mptVerifier) != address(0), "MptVerifier is not set");
        require(address(blockUpdater) != address(0), "Block Updater is not set");

        IMptVerifier.Receipt memory receipt = mptVerifier.validateMPT(mptProof);
        require(receipt.state == 1, "Source Chain Transaction Failure");

        require(blockUpdater.checkBlock(srcBlockHash, receipt.receiptHash), "Block Header is not set");

        LogMessage memory logMessage = _parseLog(receipt.logs, logIndex);
        require(logMessage.srcZkBridge == zkBridgeContracts(srcChainId), "Invalid source ZKBridge");
        require(logMessage.dstChainId == chainId(), "Invalid destination chain");
        bytes32 hash = keccak256(abi.encode(srcChainId, logMessage.srcAddress, logMessage.sequence));
        require(!isTransferCompleted(hash), "Message already executed.");
        _setTransferCompleted(hash);

        address srcAddress = _truncateAddress(logMessage.srcAddress);
        IZKBridgeReceiver(logMessage.dstAddress).zkReceive(srcChainId, srcAddress, logMessage.sequence, logMessage.payload);
        emit ExecutedMessage(srcAddress, srcChainId, logMessage.sequence, logMessage.dstAddress, logMessage.payload);
    }

    function _useSequence(uint16 chainId, address emitter) internal returns (uint64 sequence) {
        bytes32 hash = keccak256(abi.encode(chainId, emitter));
        sequence = nextSequence(hash);
        _setNextSequence(hash, sequence + 1);
    }

    function _parseLog(bytes memory logsByte, uint256 logIndex) internal pure returns (LogMessage memory logMessage) {
        RLPReader.RLPItem[] memory logs = logsByte.toRlpItem().toList();
        if (logIndex != 0) {
            logs = logs[logIndex + 2].toRlpBytes().toRlpItem().toList();
        }
        RLPReader.RLPItem[] memory topicItem = logs[1].toRlpBytes().toRlpItem().toList();
        bytes32 topic = abi.decode(topicItem[0].toBytes(), (bytes32));
        if (topic == MESSAGE_TOPIC) {
            logMessage.srcZkBridge = logs[0].toBytes32();
            logMessage.srcAddress = abi.decode(topicItem[1].toBytes(), (bytes32));
            logMessage.dstChainId = abi.decode(topicItem[2].toBytes(), (uint16));
            logMessage.sequence = abi.decode(topicItem[3].toBytes(), (uint64));
            (logMessage.dstAddress, logMessage.payload) = abi.decode(logs[2].toBytes(), (address, bytes));
        }
    }

    function _truncateAddress(bytes32 b) internal pure returns (address) {
        require(bytes12(b) == 0, "invalid EVM address");
        return address(uint160(uint256(b)));
    }

    fallback() external payable {revert("unsupported");}

    receive() external payable {revert("the ZkBridge contract does not accept assets");}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.9._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./State.sol";
import "./interfaces/IMptVerifier.sol";
import "./interfaces/IBlockUpdater.sol";

contract Getters is State {

    function isInitialized(address impl) public view returns (bool) {
        return _state.initializedImplementations[impl];
    }

    function chainId() public view returns (uint16) {
        return _state.provider.chainId;
    }

    function nextSequence(bytes32 hash) public view returns (uint64) {
        return _state.sequences[hash];
    }

    function zkBridgeContracts(uint16 chainId) public view returns (bytes32){
        return _state.zkBridgeImplementations[chainId];
    }

    function isTransferCompleted(bytes32 hash) public view returns (bool) {
        return _state.completedTransfers[hash];
    }

    function mptVerifier(uint16 chainId) public view returns (IMptVerifier) {
        return IMptVerifier(_state.mptVerifiers[chainId]);
    }

    function blockUpdater(uint16 chainId) public view returns (IBlockUpdater) {
        return IBlockUpdater(_state.blockUpdaters[chainId]);
    }

    function owner() public view returns (address) {
        return _state.owner;
    }

    function pendingImplementation() public view returns (address) {
        return _state.pendingImplementation;
    }

    function toUpdateTime() public view returns (uint256) {
        return _state.toUpdateTime;
    }

    function lockTime() public view returns (uint256) {
        return _state.lockTime;
    }

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./Setters.sol";
import "./Getters.sol";
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Upgrade.sol";

abstract contract Governance is Setters, Getters, ERC1967Upgrade {

    event NewPendingImplementation(address indexed pendingImplementation, address indexed newImplementation);
    event ContractUpgraded(address indexed oldContract, address indexed newContract);

    modifier onlyOwner() {
        require(owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function registerChain(uint16 chainId, bytes32 bridgeContract) public onlyOwner {
        _setZKBridgeImplementation(chainId, bridgeContract);
    }

    function setMptVerifier(uint16 chainId, address mptVerifier) public onlyOwner {
        _setMptVerifier(chainId, mptVerifier);
    }

    function setBlockUpdater(uint16 chainId, address blockUpdater) public onlyOwner {
        _setBlockUpdater(chainId, blockUpdater);
    }

    function setLockTime(uint256 lockTime) public onlyOwner {
        require(lockTime >= MIN_LOCK_TIME, 'Incorrect lockTime settings');
        _setLockTime(lockTime);
    }

    function claimFees() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }

    function submitContractUpgrade(address newImplementation) public onlyOwner {
        require(newImplementation != address(0), "Check pendingImplementation");
        address currentPendingImplementation = pendingImplementation();
        _setPendingImplementation(newImplementation);
        _setToUpdateTime(block.timestamp + lockTime());
        emit NewPendingImplementation(currentPendingImplementation, newImplementation);
    }

    function confirmContractUpgrade() public onlyOwner {
        require(pendingImplementation() != address(0), "Check pendingImplementation");
        require(block.timestamp >= toUpdateTime(), "Still locked in");

        address currentImplementation = _getImplementation();
        address newImplementation = pendingImplementation();
        _setPendingImplementation(address(0));

        _upgradeTo(newImplementation);
        // Call initialize function of the new implementation
        (bool success, bytes memory reason) = newImplementation.delegatecall(abi.encodeWithSignature("initialize()"));

        require(success, string(reason));

        emit ContractUpgraded(currentImplementation, newImplementation);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBlockUpdater {
    function checkBlock(bytes32 blockHash, bytes32 receiptsRoot) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IMptVerifier {
    struct Receipt {
        bytes32 receiptHash;
        uint256 state;
        bytes logs;
    }

    function validateMPT(bytes memory proof) external view returns (Receipt memory receipt);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IZKBridgeEntrypoint {

    event MessagePublished(address indexed sender, uint16 indexed dstChainId, uint64 indexed sequence, address dstAddress, bytes payload);

    event ExecutedMessage(address indexed sender, uint16 indexed srcChainId, uint64 indexed sequence, address dstAddress, bytes payload);

    function send(uint16 dstChainId, address dstAddress, bytes memory payload) external payable returns (uint64 sequence);

    function validateTransactionProof(uint16 srcChainId, bytes32 srcBlockHash, uint256 logIndex, bytes memory mptProof) external;

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IZKBridgeReceiver {
    // @notice ZKBridge endpoint will invoke this function to deliver the message on the destination
    // @param srcChainId - the source endpoint identifier
    // @param srcAddress - the source sending contract address from the source chain
    // @param sequence - the ordered message nonce
    // @param payload - the signed payload is the UA bytes has encoded to be sent
    function zkReceive(uint16 srcChainId, address srcAddress, uint64 sequence, bytes calldata payload) external;
}

// SPDX-License-Identifier: MIT


pragma solidity ^0.8.0;

library RLPReader {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START  = 0xb8;
    uint8 constant LIST_SHORT_START   = 0xc0;
    uint8 constant LIST_LONG_START    = 0xf8;
    uint8 constant WORD_SIZE = 32;

    struct RLPItem {
        uint len;
        uint memPtr;
    }

    struct Iterator {
        RLPItem item;   // Item that's being iterated over.
        uint nextPtr;   // Position of the next item in the list.
    }

    /*
    * @dev Returns the next element in the iteration. Reverts if it has not next element.
    * @param self The iterator.
    * @return The next element in the iteration.
    */
    function next(Iterator memory self) internal pure returns (RLPItem memory) {
        require(hasNext(self));

        uint ptr = self.nextPtr;
        uint itemLength = _itemLength(ptr);
        self.nextPtr = ptr + itemLength;

        return RLPItem(itemLength, ptr);
    }

    /*
    * @dev Returns true if the iteration has more elements.
    * @param self The iterator.
    * @return true if the iteration has more elements.
    */
    function hasNext(Iterator memory self) internal pure returns (bool) {
        RLPItem memory item = self.item;
        return self.nextPtr < item.memPtr + item.len;
    }

    /*
    * @param item RLP encoded bytes
    */
    function toRlpItem(bytes memory item) internal pure returns (RLPItem memory) {
        uint memPtr;
        assembly {
            memPtr := add(item, 0x20)
        }

        return RLPItem(item.length, memPtr);
    }

    /*
    * @dev Create an iterator. Reverts if item is not a list.
    * @param self The RLP item.
    * @return An 'Iterator' over the item.
    */
    function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
        require(isList(self));

        uint ptr = self.memPtr + _payloadOffset(self.memPtr);
        return Iterator(self, ptr);
    }

    /*
    * @param the RLP item.
    */
    function rlpLen(RLPItem memory item) internal pure returns (uint) {
        return item.len;
    }

    /*
     * @param the RLP item.
     * @return (memPtr, len) pair: location of the item's payload in memory.
     */
    function payloadLocation(RLPItem memory item) internal pure returns (uint, uint) {
        uint offset = _payloadOffset(item.memPtr);
        uint memPtr = item.memPtr + offset;
        uint len = item.len - offset; // data length
        return (memPtr, len);
    }

    /*
    * @param the RLP item.
    */
    function payloadLen(RLPItem memory item) internal pure returns (uint) {
        (, uint len) = payloadLocation(item);
        return len;
    }

    /*
    * @param the RLP item containing the encoded list.
    */
    function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
        require(isList(item));

        uint items = numItems(item);
        RLPItem[] memory result = new RLPItem[](items);

        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < items; i++) {
            dataLen = _itemLength(memPtr);
            result[i] = RLPItem(dataLen, memPtr);
            memPtr = memPtr + dataLen;
        }

        return result;
    }

    // @return indicator whether encoded payload is a list. negate this function call for isData.
    function isList(RLPItem memory item) internal pure returns (bool) {
        if (item.len == 0) return false;

        uint8 byte0;
        uint memPtr = item.memPtr;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < LIST_SHORT_START)
            return false;
        return true;
    }

    /*
     * @dev A cheaper version of keccak256(toRlpBytes(item)) that avoids copying memory.
     * @return keccak256 hash of RLP encoded bytes.
     */
    function rlpBytesKeccak256(RLPItem memory item) internal pure returns (bytes32) {
        uint256 ptr = item.memPtr;
        uint256 len = item.len;
        bytes32 result;
        assembly {
            result := keccak256(ptr, len)
        }
        return result;
    }

    /*
     * @dev A cheaper version of keccak256(toBytes(item)) that avoids copying memory.
     * @return keccak256 hash of the item payload.
     */
    function payloadKeccak256(RLPItem memory item) internal pure returns (bytes32) {
        (uint memPtr, uint len) = payloadLocation(item);
        bytes32 result;
        assembly {
            result := keccak256(memPtr, len)
        }
        return result;
    }

    /** RLPItem conversions into data types **/

    // @returns raw rlp encoding in bytes
    function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
        bytes memory result = new bytes(item.len);
        if (result.length == 0) return result;

        uint ptr;
        assembly {
            ptr := add(0x20, result)
        }

        copy(item.memPtr, ptr, item.len);
        return result;
    }

    // any non-zero byte except "0x80" is considered true
    function toBoolean(RLPItem memory item) internal pure returns (bool) {
        require(item.len == 1);
        uint result;
        uint memPtr = item.memPtr;
        assembly {
            result := byte(0, mload(memPtr))
        }

        // SEE Github Issue #5.
        // Summary: Most commonly used RLP libraries (i.e Geth) will encode
        // "0" as "0x80" instead of as "0". We handle this edge case explicitly
        // here.
        if (result == 0 || result == STRING_SHORT_START) {
            return false;
        } else {
            return true;
        }
    }

    function toAddress(RLPItem memory item) internal pure returns (address) {
        // 1 byte for the length prefix
        require(item.len == 21);

        return address(uint160(toUint(item)));
    }

    function toUint(RLPItem memory item) internal pure returns (uint) {
        require(item.len > 0 && item.len <= 33);

        (uint memPtr, uint len) = payloadLocation(item);

        uint result;
        assembly {
            result := mload(memPtr)

        // shfit to the correct location if neccesary
            if lt(len, 32) {
                result := div(result, exp(256, sub(32, len)))
            }
        }

        return result;
    }

    // enforces 32 byte length
    function toUintStrict(RLPItem memory item) internal pure returns (uint) {
        // one byte prefix
        require(item.len == 33);

        uint result;
        uint memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }

        return result;
    }

    function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
        require(item.len > 0);

        (uint memPtr, uint len) = payloadLocation(item);
        bytes memory result = new bytes(len);

        uint destPtr;
        assembly {
            destPtr := add(0x20, result)
        }

        copy(memPtr, destPtr, len);
        return result;
    }

    /*
    * Private Helpers
    */

    // @return number of payload items inside an encoded list.
    function numItems(RLPItem memory item) private pure returns (uint) {
        if (item.len == 0) return 0;

        uint count = 0;
        uint currPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint endPtr = item.memPtr + item.len;
        while (currPtr < endPtr) {
            currPtr = currPtr + _itemLength(currPtr); // skip over an item
            count++;
        }

        return count;
    }

    // @return entire rlp item byte length
    function _itemLength(uint memPtr) private pure returns (uint) {
        uint itemLen;
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START)
            itemLen = 1;

        else if (byte0 < STRING_LONG_START)
            itemLen = byte0 - STRING_SHORT_START + 1;

        else if (byte0 < LIST_SHORT_START) {
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                memPtr := add(memPtr, 1) // skip over the first byte

            /* 32 byte word size */
                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
                itemLen := add(dataLen, add(byteLen, 1))
            }
        }

        else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        }

        else {
            assembly {
                let byteLen := sub(byte0, 0xf7)
                memPtr := add(memPtr, 1)

                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
                itemLen := add(dataLen, add(byteLen, 1))
            }
        }

        return itemLen;
    }

    // @return number of bytes until the data
    function _payloadOffset(uint memPtr) private pure returns (uint) {
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START)
            return 0;
        else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START))
            return 1;
        else if (byte0 < LIST_SHORT_START)  // being explicit
            return byte0 - (STRING_LONG_START - 1) + 1;
        else
            return byte0 - (LIST_LONG_START - 1) + 1;
    }

    /*
    * @param src Pointer to source
    * @param dest Pointer to destination
    * @param len Amount of memory to copy from the source
    */
    function copy(uint src, uint dest, uint len) private pure {
        if (len == 0) return;

        // copy as many word sizes as possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }

            src += WORD_SIZE;
            dest += WORD_SIZE;
        }

        if (len > 0) {
            // left over bytes. Mask is used to remove unwanted bytes from the word
            uint mask = 256 ** (WORD_SIZE - len) - 1;
            assembly {
                let srcpart := and(mload(src), not(mask)) // zero out src
                let destpart := and(mload(dest), mask) // retrieve the bytes
                mstore(dest, or(destpart, srcpart))
            }
        }
    }
    function toBytes32(RLPItem memory self) internal pure returns (bytes32 data) {
        return bytes32(toUint(self));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./State.sol";

contract Setters is State {

    function _setInitialized(address implementation) internal {
        _state.initializedImplementations[implementation] = true;
    }

    function _setChainId(uint16 chainId) internal {
        _state.provider.chainId = chainId;
    }

    function _setTransferCompleted(bytes32 hash) internal {
        _state.completedTransfers[hash] = true;
    }

    function _setZKBridgeImplementation(uint16 chainId, bytes32 bridgeContract) internal {
        _state.zkBridgeImplementations[chainId] = bridgeContract;
    }

    function _setOwner(address owner) internal {
        _state.owner = owner;
    }

    function _setNextSequence(bytes32 hash, uint64 sequence) internal {
        _state.sequences[hash] = sequence;
    }

    function _setMptVerifier(uint16 chainId,address mptVerifier) internal {
        _state.mptVerifiers[chainId] = mptVerifier;
    }

    function _setBlockUpdater(uint16 chainId,address blockUpdater) internal {
        _state.blockUpdaters[chainId] = blockUpdater;
    }

    function _setPendingImplementation(address pendingImplementation) internal {
        _state.pendingImplementation = pendingImplementation;
    }

    function _setToUpdateTime(uint256 toUpdateTime) internal {
        _state.toUpdateTime = toUpdateTime;
    }

    function _setLockTime(uint256 lockTime) internal {
        _state.lockTime = lockTime;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;


contract Storage {

    struct Provider {
        uint16 chainId;
    }

    struct ZKBridgeState {
        Provider provider;

        // owner
        address owner;

        //upgrade pending contract
        address pendingImplementation;

        //Upgrade confirmation time
        uint256 toUpdateTime;

        //Upgrade lock time
        uint256 lockTime;

        // Sequence numbers per emitter
        mapping(bytes32 => uint64) sequences;

        // Mapping of zkBridge contracts on other chains
        mapping(uint16 => bytes32) zkBridgeImplementations;

        // Mapping of initialized implementations
        mapping(address => bool) initializedImplementations;

        // Mapping of consumed token transfers
        mapping(bytes32 => bool) completedTransfers;

        // Mapping of mpt verifiers
        mapping(uint16 => address) mptVerifiers;

        // Mapping of block updaters
        mapping(uint16 => address) blockUpdaters;
    }
}

contract State {
    Storage.ZKBridgeState _state;
    uint256 public constant MIN_LOCK_TIME = 1 days;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IBlockUpdater","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainId","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"confirmContractUpgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"impl","type":"address"}],"name":"isInitialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"hash","type":"bytes32"}],"name":"isTransferCompleted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"}],"name":"mptVerifier","outputs":[{"internalType":"contract IMptVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"hash","type":"bytes32"}],"name":"nextSequence","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"},{"internalType":"bytes32","name":"bridgeContract","type":"bytes32"}],"name":"registerChain","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"dstChainId","type":"uint16"},{"internalType":"address","name":"dstAddress","type":"address"},{"internalType":"bytes","name":"payload","type":"bytes"}],"name":"send","outputs":[{"internalType":"uint64","name":"sequence","type":"uint64"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"},{"internalType":"address","name":"blockUpdater","type":"address"}],"name":"setBlockUpdater","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"lockTime","type":"uint256"}],"name":"setLockTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"},{"internalType":"address","name":"mptVerifier","type":"address"}],"name":"setMptVerifier","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"submitContractUpgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"toUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"srcChainId","type":"uint16"},{"internalType":"bytes32","name":"srcBlockHash","type":"bytes32"},{"internalType":"uint256","name":"logIndex","type":"uint256"},{"internalType":"bytes","name":"mptProof","type":"bytes"}],"name":"validateTransactionProof","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"}],"name":"zkBridgeContracts","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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