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// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;

import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import { BytesLib } from "@layerzerolabs/solidity-examples/contracts/libraries/BytesLib.sol";
import { ExcessivelySafeCall } from "@layerzerolabs/solidity-examples/contracts/libraries/ExcessivelySafeCall.sol";
import { ensureNonzeroAddress } from "@venusprotocol/solidity-utilities/contracts/validators.sol";
import { BaseOmnichainControllerDest } from "./BaseOmnichainControllerDest.sol";
import { ITimelock } from "./interfaces/ITimelock.sol";

/**
 * @title OmnichainGovernanceExecutor
 * @notice Executes the proposal transactions sent from the main chain
 * @dev The owner of this contract controls LayerZero configuration. When used in production the owner will be OmnichainExecutor
 * This implementation is non-blocking, meaning the failed messages will not block the future messages from the source.
 * For the blocking behavior, derive the contract from LzApp.
 * @custom:security-contact https://github.com/VenusProtocol/governance-contracts#discussion
 */
contract OmnichainGovernanceExecutor is ReentrancyGuard, BaseOmnichainControllerDest {
    using BytesLib for bytes;
    using ExcessivelySafeCall for address;

    enum ProposalType {
        NORMAL,
        FASTTRACK,
        CRITICAL
    }

    struct Proposal {
        /** Unique id for looking up a proposal */
        uint256 id;
        /** The timestamp that the proposal will be available for execution, set once the vote succeeds */
        uint256 eta;
        /** The ordered list of target addresses for calls to be made */
        address[] targets;
        /** The ordered list of values (i.e. msg.value) to be passed to the calls to be made */
        uint256[] values;
        /** The ordered list of function signatures to be called */
        string[] signatures;
        /** The ordered list of calldata to be passed to each call */
        bytes[] calldatas;
        /** Flag marking whether the proposal has been canceled */
        bool canceled;
        /** Flag marking whether the proposal has been executed */
        bool executed;
        /** The type of the proposal */
        uint8 proposalType;
    }
    /*
     * @notice Possible states that a proposal may be in
     */
    enum ProposalState {
        Canceled,
        Queued,
        Executed
    }

    /**
     * @notice A privileged role that can cancel any proposal
     */
    address public guardian;

    /**
     * @notice Stores BNB chain layerzero endpoint id
     */
    uint16 public srcChainId;

    /**
     * @notice Last proposal count received
     */
    uint256 public lastProposalReceived;

    /**
     * @notice The official record of all proposals ever proposed
     */
    mapping(uint256 => Proposal) public proposals;

    /**
     * @notice Mapping containing Timelock addresses for each proposal type
     */
    mapping(uint256 => ITimelock) public proposalTimelocks;

    /**
     * @notice Represents queue state of proposal
     */
    mapping(uint256 => bool) public queued;

    /**
     * @notice Emitted when proposal is received
     */
    event ProposalReceived(
        uint256 indexed proposalId,
        address[] targets,
        uint256[] values,
        string[] signatures,
        bytes[] calldatas,
        uint8 proposalType
    );

    /**
     * @notice Emitted when proposal is queued
     */
    event ProposalQueued(uint256 indexed id, uint256 eta);

    /**
     * Emitted when proposal executed
     */
    event ProposalExecuted(uint256 indexed id);

    /**
     * @notice Emitted when proposal failed
     */
    event ReceivePayloadFailed(uint16 indexed srcChainId, bytes indexed srcAddress, uint64 nonce, bytes reason);

    /**
     * @notice Emitted when proposal is canceled
     */
    event ProposalCanceled(uint256 indexed id);

    /**
     * @notice Emitted when timelock added
     */
    event TimelockAdded(uint8 routeType, address indexed oldTimelock, address indexed newTimelock);

    /**
     * @notice Emitted when source layerzero endpoint id is updated
     */
    event SetSrcChainId(uint16 indexed oldSrcChainId, uint16 indexed newSrcChainId);

    /**
     * @notice Emitted when new guardian address is set
     */
    event NewGuardian(address indexed oldGuardian, address indexed newGuardian);

    /**
     * @notice Emitted when pending admin of Timelock is updated
     */
    event SetTimelockPendingAdmin(address, uint8);

    /**
     * @notice Thrown when proposal ID is invalid
     */
    error InvalidProposalId();

    constructor(address endpoint_, address guardian_, uint16 srcChainId_) BaseOmnichainControllerDest(endpoint_) {
        ensureNonzeroAddress(guardian_);
        guardian = guardian_;
        srcChainId = srcChainId_;
    }

    /**
     * @notice Update source layerzero endpoint id
     * @param srcChainId_ The new source chain id to be set
     * @custom:event Emit SetSrcChainId with old and new source id
     * @custom:access Only owner
     */
    function setSrcChainId(uint16 srcChainId_) external onlyOwner {
        emit SetSrcChainId(srcChainId, srcChainId_);
        srcChainId = srcChainId_;
    }

    /**
     * @notice Sets the new executor guardian
     * @param newGuardian The address of the new guardian
     * @custom:access Must be call by guardian or owner
     * @custom:event Emit NewGuardian with old and new guardian address
     */
    function setGuardian(address newGuardian) external {
        require(
            msg.sender == guardian || msg.sender == owner(),
            "OmnichainGovernanceExecutor::setGuardian: owner or guardian only"
        );
        ensureNonzeroAddress(newGuardian);
        emit NewGuardian(guardian, newGuardian);
        guardian = newGuardian;
    }

    /**
     * @notice Add timelocks to the ProposalTimelocks mapping
     * @param timelocks_ Array of addresses of all 3 timelocks
     * @custom:access Only owner
     * @custom:event Emits TimelockAdded with old and new timelock and route type
     */
    function addTimelocks(ITimelock[] memory timelocks_) external onlyOwner {
        uint8 length = uint8(type(ProposalType).max) + 1;
        require(
            timelocks_.length == length,
            "OmnichainGovernanceExecutor::addTimelocks:number of timelocks should match the number of governance routes"
        );
        for (uint8 i; i < length; ++i) {
            ensureNonzeroAddress(address(timelocks_[i]));
            emit TimelockAdded(i, address(proposalTimelocks[i]), address(timelocks_[i]));
            proposalTimelocks[i] = timelocks_[i];
        }
    }

    /**
     * @notice Executes a queued proposal if eta has passed
     * @param proposalId_ Id of proposal that is to be executed
     * @custom:event Emits ProposalExecuted with proposal id of executed proposal
     */
    function execute(uint256 proposalId_) external nonReentrant {
        require(
            state(proposalId_) == ProposalState.Queued,
            "OmnichainGovernanceExecutor::execute: proposal can only be executed if it is queued"
        );

        Proposal storage proposal = proposals[proposalId_];
        proposal.executed = true;
        ITimelock timelock = proposalTimelocks[proposal.proposalType];
        uint256 eta = proposal.eta;
        uint256 length = proposal.targets.length;

        emit ProposalExecuted(proposalId_);

        for (uint256 i; i < length; ++i) {
            timelock.executeTransaction(
                proposal.targets[i],
                proposal.values[i],
                proposal.signatures[i],
                proposal.calldatas[i],
                eta
            );
        }
        delete queued[proposalId_];
    }

    /**
     * @notice Cancels a proposal only if sender is the guardian and proposal is not executed
     * @param proposalId_ Id of proposal that is to be canceled
     * @custom:access Sender must be the guardian
     * @custom:event Emits ProposalCanceled with proposal id of the canceled proposal
     */
    function cancel(uint256 proposalId_) external {
        require(
            state(proposalId_) == ProposalState.Queued,
            "OmnichainGovernanceExecutor::cancel: proposal should be queued and not executed"
        );
        Proposal storage proposal = proposals[proposalId_];
        require(msg.sender == guardian, "OmnichainGovernanceExecutor::cancel: sender must be guardian");

        proposal.canceled = true;
        ITimelock timelock = proposalTimelocks[proposal.proposalType];
        uint256 eta = proposal.eta;
        uint256 length = proposal.targets.length;

        emit ProposalCanceled(proposalId_);

        for (uint256 i; i < length; ++i) {
            timelock.cancelTransaction(
                proposal.targets[i],
                proposal.values[i],
                proposal.signatures[i],
                proposal.calldatas[i],
                eta
            );
        }
        delete queued[proposalId_];
    }

    /**
     * @notice Sets the new pending admin of the Timelock
     * @param pendingAdmin_ Address of new pending admin
     * @param proposalType_ Type of proposal
     * @custom:access Only owner
     * @custom:event Emits SetTimelockPendingAdmin with new pending admin and proposal type
     */
    function setTimelockPendingAdmin(address pendingAdmin_, uint8 proposalType_) external onlyOwner {
        uint8 proposalTypeLength = uint8(type(ProposalType).max) + 1;
        require(
            proposalType_ < proposalTypeLength,
            "OmnichainGovernanceExecutor::setTimelockPendingAdmin: invalid proposal type"
        );

        proposalTimelocks[proposalType_].setPendingAdmin(pendingAdmin_);
        emit SetTimelockPendingAdmin(pendingAdmin_, proposalType_);
    }

    /**
     * @notice Resends a previously failed message
     * @param srcChainId_ Source chain Id
     * @param srcAddress_ Source address => local app address + remote app address
     * @param nonce_ Nonce to identify failed message
     * @param payload_ The payload of the message to be retried
     * @custom:access Only owner
     */
    function retryMessage(
        uint16 srcChainId_,
        bytes calldata srcAddress_,
        uint64 nonce_,
        bytes calldata payload_
    ) public payable override onlyOwner nonReentrant {
        require(
            keccak256(trustedRemoteLookup[srcChainId_]) == keccak256(srcAddress_),
            "OmnichainGovernanceExecutor::retryMessage: not a trusted remote"
        );
        super.retryMessage(srcChainId_, srcAddress_, nonce_, payload_);
    }

    /**
     * @notice Gets the state of a proposal
     * @param proposalId_ The id of the proposal
     * @return Proposal state
     */
    function state(uint256 proposalId_) public view returns (ProposalState) {
        Proposal storage proposal = proposals[proposalId_];
        if (proposal.canceled) {
            return ProposalState.Canceled;
        } else if (proposal.executed) {
            return ProposalState.Executed;
        } else if (queued[proposalId_]) {
            // queued only when proposal is received
            return ProposalState.Queued;
        } else {
            revert InvalidProposalId();
        }
    }

    /**
     * @notice Process blocking LayerZero receive request
     * @param srcChainId_ Source chain Id
     * @param srcAddress_ Source address from which payload is received
     * @param nonce_ Nonce associated with the payload to prevent replay attacks
     * @param payload_ Encoded payload containing proposal information
     * @custom:event Emit ReceivePayloadFailed if call fails
     */
    function _blockingLzReceive(
        uint16 srcChainId_,
        bytes memory srcAddress_,
        uint64 nonce_,
        bytes memory payload_
    ) internal virtual override {
        require(srcChainId_ == srcChainId, "OmnichainGovernanceExecutor::_blockingLzReceive: invalid source chain id");
        bytes32 hashedPayload = keccak256(payload_);
        bytes memory callData = abi.encodeCall(this.nonblockingLzReceive, (srcChainId_, srcAddress_, nonce_, payload_));

        (bool success, bytes memory reason) = address(this).excessivelySafeCall(gasleft() - 30000, 150, callData);
        // try-catch all errors/exceptions
        if (!success) {
            failedMessages[srcChainId_][srcAddress_][nonce_] = hashedPayload;
            emit ReceivePayloadFailed(srcChainId_, srcAddress_, nonce_, reason); // Retrieve payload from the src side tx if needed to clear
        }
    }

    /**
     * @notice Process non blocking LayerZero receive request
     * @param payload_ Encoded payload containing proposal information
     * @custom:event Emit ProposalReceived
     */
    function _nonblockingLzReceive(
        uint16,
        bytes memory,
        uint64,
        bytes memory payload_
    ) internal virtual override whenNotPaused {
        (bytes memory payload, uint256 pId) = abi.decode(payload_, (bytes, uint256));
        (
            address[] memory targets,
            uint256[] memory values,
            string[] memory signatures,
            bytes[] memory calldatas,
            uint8 pType
        ) = abi.decode(payload, (address[], uint256[], string[], bytes[], uint8));
        require(proposals[pId].id == 0, "OmnichainGovernanceExecutor::_nonblockingLzReceive: duplicate proposal");
        require(
            targets.length == values.length &&
                targets.length == signatures.length &&
                targets.length == calldatas.length,
            "OmnichainGovernanceExecutor::_nonblockingLzReceive: proposal function information arity mismatch"
        );
        require(
            pType < uint8(type(ProposalType).max) + 1,
            "OmnichainGovernanceExecutor::_nonblockingLzReceive: invalid proposal type"
        );
        _isEligibleToReceive(targets.length);

        Proposal memory newProposal = Proposal({
            id: pId,
            eta: 0,
            targets: targets,
            values: values,
            signatures: signatures,
            calldatas: calldatas,
            canceled: false,
            executed: false,
            proposalType: pType
        });

        proposals[pId] = newProposal;
        lastProposalReceived = pId;

        emit ProposalReceived(newProposal.id, targets, values, signatures, calldatas, pType);
        _queue(pId);
    }

    /**
     * @notice Queue proposal for execution
     * @param proposalId_ Proposal to be queued
     * @custom:event Emit ProposalQueued with proposal id and eta
     */
    function _queue(uint256 proposalId_) internal {
        Proposal storage proposal = proposals[proposalId_];
        uint256 eta = block.timestamp + proposalTimelocks[proposal.proposalType].delay();

        proposal.eta = eta;
        queued[proposalId_] = true;
        uint8 proposalType = proposal.proposalType;
        uint256 length = proposal.targets.length;
        emit ProposalQueued(proposalId_, eta);

        for (uint256 i; i < length; ++i) {
            _queueOrRevertInternal(
                proposal.targets[i],
                proposal.values[i],
                proposal.signatures[i],
                proposal.calldatas[i],
                eta,
                proposalType
            );
        }
    }

    /**
     * @notice Check for unique proposal
     * @param target_ Address of the contract with the method to be called
     * @param value_ Native token amount sent with the transaction
     * @param signature_ Signature of the function to be called
     * @param data_ Arguments to be passed to the function when called
     * @param eta_ Timestamp after which the transaction can be executed
     * @param proposalType_ Type of proposal
     */
    function _queueOrRevertInternal(
        address target_,
        uint256 value_,
        string memory signature_,
        bytes memory data_,
        uint256 eta_,
        uint8 proposalType_
    ) internal {
        require(
            !proposalTimelocks[proposalType_].queuedTransactions(
                keccak256(abi.encode(target_, value_, signature_, data_, eta_))
            ),
            "OmnichainGovernanceExecutor::queueOrRevertInternal: identical proposal action already queued at eta"
        );

        proposalTimelocks[proposalType_].queueTransaction(target_, value_, signature_, data_, eta_);
    }
}

// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;

library BytesLib {
    function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) {
        bytes memory tempBytes;

        assembly {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
            tempBytes := mload(0x40)

            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)

            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }

            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)

            for {
                let cc := add(_postBytes, 0x20)
            } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                mstore(mc, mload(cc))
            }

            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(
                0x40,
                and(
                    add(add(end, iszero(add(length, mload(_preBytes)))), 31),
                    not(31) // Round down to the nearest 32 bytes.
                )
            )
        }

        return tempBytes;
    }

    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
            // Read the first 32 bytes of _preBytes storage, which is the length
            // of the array. (We don't need to use the offset into the slot
            // because arrays use the entire slot.)
            let fslot := sload(_preBytes.slot)
            // Arrays of 31 bytes or less have an even value in their slot,
            // while longer arrays have an odd value. The actual length is
            // the slot divided by two for odd values, and the lowest order
            // byte divided by two for even values.
            // If the slot is even, bitwise and the slot with 255 and divide by
            // two to get the length. If the slot is odd, bitwise and the slot
            // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
                // Since the new array still fits in the slot, we just need to
                // update the contents of the slot.
                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                    _preBytes.slot,
                    // all the modifications to the slot are inside this
                    // next block
                    add(
                        // we can just add to the slot contents because the
                        // bytes we want to change are the LSBs
                        fslot,
                        add(
                            mul(
                                div(
                                    // load the bytes from memory
                                    mload(add(_postBytes, 0x20)),
                                    // zero all bytes to the right
                                    exp(0x100, sub(32, mlength))
                                ),
                                // and now shift left the number of bytes to
                                // leave space for the length in the slot
                                exp(0x100, sub(32, newlength))
                            ),
                            // increase length by the double of the memory
                            // bytes length
                            mul(mlength, 2)
                        )
                    )
                )
            }
            case 1 {
                // The stored value fits in the slot, but the combined value
                // will exceed it.
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // The contents of the _postBytes array start 32 bytes into
                // the structure. Our first read should obtain the `submod`
                // bytes that can fit into the unused space in the last word
                // of the stored array. To get this, we read 32 bytes starting
                // from `submod`, so the data we read overlaps with the array
                // contents by `submod` bytes. Masking the lowest-order
                // `submod` bytes allows us to add that value directly to the
                // stored value.

                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00), and(mload(mc), mask)))

                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // Copy over the first `submod` bytes of the new data as in
                // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(sload(sc), and(mload(mc), mask)))

                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }

    function slice(
        bytes memory _bytes,
        uint _start,
        uint _length
    ) internal pure returns (bytes memory) {
        require(_length + 31 >= _length, "slice_overflow");
        require(_bytes.length >= _start + _length, "slice_outOfBounds");

        bytes memory tempBytes;

        assembly {
            switch iszero(_length)
            case 0 {
                // Get a location of some free memory and store it in tempBytes as
                // Solidity does for memory variables.
                tempBytes := mload(0x40)

                // The first word of the slice result is potentially a partial
                // word read from the original array. To read it, we calculate
                // the length of that partial word and start copying that many
                // bytes into the array. The first word we copy will start with
                // data we don't care about, but the last `lengthmod` bytes will
                // land at the beginning of the contents of the new array. When
                // we're done copying, we overwrite the full first word with
                // the actual length of the slice.
                let lengthmod := and(_length, 31)

                // The multiplication in the next line is necessary
                // because when slicing multiples of 32 bytes (lengthmod == 0)
                // the following copy loop was copying the origin's length
                // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)

                for {
                    // The multiplication in the next line has the same exact purpose
                    // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    mstore(mc, mload(cc))
                }

                mstore(tempBytes, _length)

                //update free-memory pointer
                //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)
                //zero out the 32 bytes slice we are about to return
                //we need to do it because Solidity does not garbage collect
                mstore(tempBytes, 0)

                mstore(0x40, add(tempBytes, 0x20))
            }
        }

        return tempBytes;
    }

    function toAddress(bytes memory _bytes, uint _start) internal pure returns (address) {
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;

        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }

        return tempAddress;
    }

    function toUint8(bytes memory _bytes, uint _start) internal pure returns (uint8) {
        require(_bytes.length >= _start + 1, "toUint8_outOfBounds");
        uint8 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }

        return tempUint;
    }

    function toUint16(bytes memory _bytes, uint _start) internal pure returns (uint16) {
        require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
        uint16 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }

        return tempUint;
    }

    function toUint32(bytes memory _bytes, uint _start) internal pure returns (uint32) {
        require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
        uint32 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }

        return tempUint;
    }

    function toUint64(bytes memory _bytes, uint _start) internal pure returns (uint64) {
        require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
        uint64 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }

        return tempUint;
    }

    function toUint96(bytes memory _bytes, uint _start) internal pure returns (uint96) {
        require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
        uint96 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }

        return tempUint;
    }

    function toUint128(bytes memory _bytes, uint _start) internal pure returns (uint128) {
        require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
        uint128 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }

        return tempUint;
    }

    function toUint256(bytes memory _bytes, uint _start) internal pure returns (uint) {
        require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
        uint tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }

        return tempUint;
    }

    function toBytes32(bytes memory _bytes, uint _start) internal pure returns (bytes32) {
        require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
        bytes32 tempBytes32;

        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }

        return tempBytes32;
    }

    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;

        assembly {
            let length := mload(_preBytes)

            // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1

                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)

                for {
                    let cc := add(_postBytes, 0x20)
                    // the next line is the loop condition:
                    // while(uint256(mc < end) + cb == 2)
                } eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }

    function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) {
        bool success = true;

        assembly {
            // we know _preBytes_offset is 0
            let fslot := sload(_preBytes.slot)
            // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)

            // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
                // slength can contain both the length and contents of the array
                // if length < 32 bytes so let's prepare for that
                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                        // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)

                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                            // unsuccess:
                            success := 0
                        }
                    }
                    default {
                        // cb is a circuit breaker in the for loop since there's
                        //  no said feature for inline assembly loops
                        // cb = 1 - don't breaker
                        // cb = 0 - break
                        let cb := 1

                        // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes.slot)
                        let sc := keccak256(0x0, 0x20)

                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)

                        // the next line is the loop condition:
                        // while(uint256(mc < end) + cb == 2)
                        for {

                        } eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                                // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.7.6;

library ExcessivelySafeCall {
    uint constant LOW_28_MASK = 0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeCall(
        address _target,
        uint _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal returns (bool, bytes memory) {
        // set up for assembly call
        uint _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := call(
                _gas, // gas
                _target, // recipient
                0, // ether value
                add(_calldata, 0x20), // inloc
                mload(_calldata), // inlen
                0, // outloc
                0 // outlen
            )
            // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
            // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
            // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }

    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeStaticCall(
        address _target,
        uint _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal view returns (bool, bytes memory) {
        // set up for assembly call
        uint _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := staticcall(
                _gas, // gas
                _target, // recipient
                add(_calldata, 0x20), // inloc
                mload(_calldata), // inlen
                0, // outloc
                0 // outlen
            )
            // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
            // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
            // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }

    /**
     * @notice Swaps function selectors in encoded contract calls
     * @dev Allows reuse of encoded calldata for functions with identical
     * argument types but different names. It simply swaps out the first 4 bytes
     * for the new selector. This function modifies memory in place, and should
     * only be used with caution.
     * @param _newSelector The new 4-byte selector
     * @param _buf The encoded contract args
     */
    function swapSelector(bytes4 _newSelector, bytes memory _buf) internal pure {
        require(_buf.length >= 4);
        uint _mask = LOW_28_MASK;
        assembly {
            // load the first word of
            let _word := mload(add(_buf, 0x20))
            // mask out the top 4 bytes
            // /x
            _word := and(_word, _mask)
            _word := or(_newSelector, _word)
            mstore(add(_buf, 0x20), _word)
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/ILayerZeroReceiver.sol";
import "./interfaces/ILayerZeroUserApplicationConfig.sol";
import "./interfaces/ILayerZeroEndpoint.sol";
import "../libraries/BytesLib.sol";

/*
 * a generic LzReceiver implementation
 */
abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using BytesLib for bytes;

    // ua can not send payload larger than this by default, but it can be changed by the ua owner
    uint public constant DEFAULT_PAYLOAD_SIZE_LIMIT = 10000;

    ILayerZeroEndpoint public immutable lzEndpoint;
    mapping(uint16 => bytes) public trustedRemoteLookup;
    mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;
    mapping(uint16 => uint) public payloadSizeLimitLookup;
    address public precrime;

    event SetPrecrime(address precrime);
    event SetTrustedRemote(uint16 _remoteChainId, bytes _path);
    event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress);
    event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas);

    constructor(address _endpoint) {
        lzEndpoint = ILayerZeroEndpoint(_endpoint);
    }

    function lzReceive(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) public virtual override {
        // lzReceive must be called by the endpoint for security
        require(_msgSender() == address(lzEndpoint), "LzApp: invalid endpoint caller");

        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
        // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.
        require(
            _srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote),
            "LzApp: invalid source sending contract"
        );

        _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging
    function _blockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual;

    function _lzSend(
        uint16 _dstChainId,
        bytes memory _payload,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams,
        uint _nativeFee
    ) internal virtual {
        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
        require(trustedRemote.length != 0, "LzApp: destination chain is not a trusted source");
        _checkPayloadSize(_dstChainId, _payload.length);
        lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);
    }

    function _checkGasLimit(
        uint16 _dstChainId,
        uint16 _type,
        bytes memory _adapterParams,
        uint _extraGas
    ) internal view virtual {
        uint providedGasLimit = _getGasLimit(_adapterParams);
        uint minGasLimit = minDstGasLookup[_dstChainId][_type];
        require(minGasLimit > 0, "LzApp: minGasLimit not set");
        require(providedGasLimit >= minGasLimit + _extraGas, "LzApp: gas limit is too low");
    }

    function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) {
        require(_adapterParams.length >= 34, "LzApp: invalid adapterParams");
        assembly {
            gasLimit := mload(add(_adapterParams, 34))
        }
    }

    function _checkPayloadSize(uint16 _dstChainId, uint _payloadSize) internal view virtual {
        uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId];
        if (payloadSizeLimit == 0) {
            // use default if not set
            payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT;
        }
        require(_payloadSize <= payloadSizeLimit, "LzApp: payload size is too large");
    }

    //---------------------------UserApplication config----------------------------------------
    function getConfig(
        uint16 _version,
        uint16 _chainId,
        address,
        uint _configType
    ) external view returns (bytes memory) {
        return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);
    }

    // generic config for LayerZero user Application
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint _configType,
        bytes calldata _config
    ) external override onlyOwner {
        lzEndpoint.setConfig(_version, _chainId, _configType, _config);
    }

    function setSendVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setSendVersion(_version);
    }

    function setReceiveVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setReceiveVersion(_version);
    }

    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }

    // _path = abi.encodePacked(remoteAddress, localAddress)
    // this function set the trusted path for the cross-chain communication
    function setTrustedRemote(uint16 _remoteChainId, bytes calldata _path) external onlyOwner {
        trustedRemoteLookup[_remoteChainId] = _path;
        emit SetTrustedRemote(_remoteChainId, _path);
    }

    function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner {
        trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this));
        emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress);
    }

    function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) {
        bytes memory path = trustedRemoteLookup[_remoteChainId];
        require(path.length != 0, "LzApp: no trusted path record");
        return path.slice(0, path.length - 20); // the last 20 bytes should be address(this)
    }

    function setPrecrime(address _precrime) external onlyOwner {
        precrime = _precrime;
        emit SetPrecrime(_precrime);
    }

    function setMinDstGas(
        uint16 _dstChainId,
        uint16 _packetType,
        uint _minGas
    ) external onlyOwner {
        minDstGasLookup[_dstChainId][_packetType] = _minGas;
        emit SetMinDstGas(_dstChainId, _packetType, _minGas);
    }

    // if the size is 0, it means default size limit
    function setPayloadSizeLimit(uint16 _dstChainId, uint _size) external onlyOwner {
        payloadSizeLimitLookup[_dstChainId] = _size;
    }

    //--------------------------- VIEW FUNCTION ----------------------------------------
    function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) {
        bytes memory trustedSource = trustedRemoteLookup[_srcChainId];
        return keccak256(trustedSource) == keccak256(_srcAddress);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./LzApp.sol";
import "../libraries/ExcessivelySafeCall.sol";

/*
 * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel
 * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking
 * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress)
 */
abstract contract NonblockingLzApp is LzApp {
    using ExcessivelySafeCall for address;

    constructor(address _endpoint) LzApp(_endpoint) {}

    mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages;

    event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason);
    event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash);

    // overriding the virtual function in LzReceiver
    function _blockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual override {
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(
            gasleft(),
            150,
            abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload)
        );
        if (!success) {
            _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason);
        }
    }

    function _storeFailedMessage(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload,
        bytes memory _reason
    ) internal virtual {
        failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);
        emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason);
    }

    function nonblockingLzReceive(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) public virtual {
        // only internal transaction
        require(_msgSender() == address(this), "NonblockingLzApp: caller must be LzApp");
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    //@notice override this function
    function _nonblockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual;

    function retryMessage(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) public payable virtual {
        // assert there is message to retry
        bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];
        require(payloadHash != bytes32(0), "NonblockingLzApp: no stored message");
        require(keccak256(_payload) == payloadHash, "NonblockingLzApp: invalid payload");
        // clear the stored message
        failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);
        // execute the message. revert if it fails again
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
        emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ILayerZeroUserApplicationConfig.sol";

interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(
        uint16 _dstChainId,
        bytes calldata _destination,
        bytes calldata _payload,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable;

    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        address _dstAddress,
        uint64 _nonce,
        uint _gasLimit,
        bytes calldata _payload
    ) external;

    // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);

    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);

    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(
        uint16 _dstChainId,
        address _userApplication,
        bytes calldata _payload,
        bool _payInZRO,
        bytes calldata _adapterParam
    ) external view returns (uint nativeFee, uint zroFee);

    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);

    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        bytes calldata _payload
    ) external;

    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);

    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);

    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);

    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(
        uint16 _version,
        uint16 _chainId,
        address _userApplication,
        uint _configType
    ) external view returns (bytes memory);

    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);

    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroReceiver {
    // @notice LayerZero 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 _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint _configType,
        bytes calldata _config
    ) external;

    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;

    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;

    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.25;

/// @notice Thrown if the supplied address is a zero address where it is not allowed
error ZeroAddressNotAllowed();

/// @notice Thrown if the supplied value is 0 where it is not allowed
error ZeroValueNotAllowed();

/// @notice Checks if the provided address is nonzero, reverts otherwise
/// @param address_ Address to check
/// @custom:error ZeroAddressNotAllowed is thrown if the provided address is a zero address
function ensureNonzeroAddress(address address_) pure {
    if (address_ == address(0)) {
        revert ZeroAddressNotAllowed();
    }
}

/// @notice Checks if the provided value is nonzero, reverts otherwise
/// @param value_ Value to check
/// @custom:error ZeroValueNotAllowed is thrown if the provided value is 0
function ensureNonzeroValue(uint256 value_) pure {
    if (value_ == 0) {
        revert ZeroValueNotAllowed();
    }
}

//  SPDX-License-Identifier: BSD-3-Clause

pragma solidity 0.8.25;

import { NonblockingLzApp } from "@layerzerolabs/solidity-examples/contracts/lzApp/NonblockingLzApp.sol";
import { Pausable } from "@openzeppelin/contracts/security/Pausable.sol";
import { ensureNonzeroAddress } from "@venusprotocol/solidity-utilities/contracts/validators.sol";

/**
 * @title BaseOmnichainControllerDest
 * @author Venus
 * @dev This contract is the base for the Omnichain controller destination contract
 * It provides functionality related to daily command limits and pausability
 * @custom:security-contact https://github.com/VenusProtocol/governance-contracts#discussion
 */

abstract contract BaseOmnichainControllerDest is NonblockingLzApp, Pausable {
    /**
     * @notice Maximum daily limit for receiving commands from Binance chain
     */
    uint256 public maxDailyReceiveLimit;

    /**
     * @notice Total received commands within the last 24-hour window from Binance chain
     */
    uint256 public last24HourCommandsReceived;

    /**
     * @notice Timestamp when the last 24-hour window started from Binance chain
     */
    uint256 public last24HourReceiveWindowStart;

    /**
     * @notice Emitted when the maximum daily limit for receiving command from Binance chain is modified
     */
    event SetMaxDailyReceiveLimit(uint256 oldMaxLimit, uint256 newMaxLimit);

    constructor(address endpoint_) NonblockingLzApp(endpoint_) {
        ensureNonzeroAddress(endpoint_);
    }

    /**
     * @notice Sets the maximum daily limit for receiving commands
     * @param limit_ Number of commands
     * @custom:access Only Owner
     * @custom:event Emits SetMaxDailyReceiveLimit with old and new limit
     */
    function setMaxDailyReceiveLimit(uint256 limit_) external onlyOwner {
        emit SetMaxDailyReceiveLimit(maxDailyReceiveLimit, limit_);
        maxDailyReceiveLimit = limit_;
    }

    /**
     * @notice Triggers the paused state of the controller
     * @custom:access Only owner
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Triggers the resume state of the controller
     * @custom:access Only owner
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @notice Empty implementation of renounce ownership to avoid any mishappening
     */
    function renounceOwnership() public override {}

    /**
     * @notice Check eligibility to receive commands
     * @param noOfCommands_ Number of commands to be received
     */
    function _isEligibleToReceive(uint256 noOfCommands_) internal {
        uint256 currentBlockTimestamp = block.timestamp;

        // Load values for the 24-hour window checks for receiving
        uint256 receivedInWindow = last24HourCommandsReceived;

        // Check if the time window has changed (more than 24 hours have passed)
        if (currentBlockTimestamp - last24HourReceiveWindowStart > 1 days) {
            receivedInWindow = noOfCommands_;
            last24HourReceiveWindowStart = currentBlockTimestamp;
        } else {
            receivedInWindow += noOfCommands_;
        }

        // Revert if the received amount exceeds the daily limit
        require(receivedInWindow <= maxDailyReceiveLimit, "Daily Transaction Limit Exceeded");

        // Update the received amount for the 24-hour window
        last24HourCommandsReceived = receivedInWindow;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.25;

/**
 * @title ITimelock
 * @author Venus
 * @dev Interface for Timelock contract
 * @custom:security-contact https://github.com/VenusProtocol/governance-contracts#discussion
 */
interface ITimelock {
    /**
     * @notice Delay period for the transaction queue
     */
    function delay() external view returns (uint256);

    /**
     * @notice Required period to execute a proposal transaction
     */
    function GRACE_PERIOD() external view returns (uint256);

    /**
     * @notice Method for accepting a proposed admin
     */
    function acceptAdmin() external;

    /**
     * @notice Method to propose a new admin authorized to call timelock functions. This should be the Governor Contract.
     */
    function setPendingAdmin(address pendingAdmin) external;

    /**
     * @notice Show mapping of queued transactions
     * @param hash Transaction hash
     */
    function queuedTransactions(bytes32 hash) external view returns (bool);

    /**
     * @notice Called for each action when queuing a proposal
     * @param target Address of the contract with the method to be called
     * @param value Native token amount sent with the transaction
     * @param signature signature of the function to be called
     * @param data Arguments to be passed to the function when called
     * @param eta Timestamp after which the transaction can be executed
     * @return Hash of the queued transaction
     */
    function queueTransaction(
        address target,
        uint256 value,
        string calldata signature,
        bytes calldata data,
        uint256 eta
    ) external returns (bytes32);

    /**
     * @notice Called to cancel a queued transaction
     * @param target Address of the contract with the method to be called
     * @param value Native token amount sent with the transaction
     * @param signature signature of the function to be called
     * @param data Arguments to be passed to the function when called
     * @param eta Timestamp after which the transaction can be executed
     */
    function cancelTransaction(
        address target,
        uint256 value,
        string calldata signature,
        bytes calldata data,
        uint256 eta
    ) external;

    /**
     * @notice Called to execute a queued transaction
     * @param target Address of the contract with the method to be called
     * @param value Native token amount sent with the transaction
     * @param signature signature of the function to be called
     * @param data Arguments to be passed to the function when called
     * @param eta Timestamp after which the transaction can be executed
     * @return Result of function call
     */
    function executeTransaction(
        address target,
        uint256 value,
        string calldata signature,
        bytes calldata data,
        uint256 eta
    ) external payable returns (bytes memory);
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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00000000000000000000000055370e0fbb5f5b8daed978ba1c075a499eb107b8000000000000000000000000df3b635d2b535f906bb02abb22aed71346e36a000000000000000000000000000000000000000000000000000000000000002776

-----Decoded View---------------
Arg [0] : endpoint_ (address): 0x55370E0fBB5f5b8dAeD978BA1c075a499eB107B8
Arg [1] : guardian_ (address): 0xdf3b635d2b535f906BB02abb22AED71346E36a00
Arg [2] : srcChainId_ (uint16): 10102

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000055370e0fbb5f5b8daed978ba1c075a499eb107b8
Arg [1] : 000000000000000000000000df3b635d2b535f906bb02abb22aed71346e36a00
Arg [2] : 0000000000000000000000000000000000000000000000000000000000002776