// File: @layerzerolabs/solidity-examples/contracts/libraries/BytesLib.sol



// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <goncalo.sa@consensys.net>
 *
 * @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;
    }
}

// File: @layerzerolabs/solidity-examples/contracts/libraries/ExcessivelySafeCall.sol



// 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)
        }
    }
}

// File: @layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroEndpoint.sol



// 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);
}

// File: @layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroReceiver.sol



// 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;
}

// File: @layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroUserApplicationConfig.sol



// 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;
}

// File: @layerzerolabs/solidity-examples/contracts/lzApp/LzApp.sol



// 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);
    }
}

// File: @layerzerolabs/solidity-examples/contracts/lzApp/NonblockingLzApp.sol



// 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)
        );
        // try-catch all errors/exceptions
        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);
    }
}

// File: @layerzerolabs/solidity-examples/contracts/token/oft/v2/BaseOFTV2.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./OFTCoreV2.sol";
import "./interfaces/IOFTV2.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

abstract contract BaseOFTV2 is OFTCoreV2, ERC165, IOFTV2 {
    constructor(uint8 _sharedDecimals, address _lzEndpoint) OFTCoreV2(_sharedDecimals, _lzEndpoint) {}

    /************************************************************************
     * public functions
     ************************************************************************/
    function sendFrom(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        LzCallParams calldata _callParams
    ) public payable virtual override {
        _send(_from, _dstChainId, _toAddress, _amount, _callParams.refundAddress, _callParams.zroPaymentAddress, _callParams.adapterParams);
    }

    function sendAndCall(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bytes calldata _payload,
        uint64 _dstGasForCall,
        LzCallParams calldata _callParams
    ) public payable virtual override {
        _sendAndCall(
            _from,
            _dstChainId,
            _toAddress,
            _amount,
            _payload,
            _dstGasForCall,
            _callParams.refundAddress,
            _callParams.zroPaymentAddress,
            _callParams.adapterParams
        );
    }

    /************************************************************************
     * public view functions
     ************************************************************************/
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IOFTV2).interfaceId || super.supportsInterface(interfaceId);
    }

    function estimateSendFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bool _useZro,
        bytes calldata _adapterParams
    ) public view virtual override returns (uint nativeFee, uint zroFee) {
        return _estimateSendFee(_dstChainId, _toAddress, _amount, _useZro, _adapterParams);
    }

    function estimateSendAndCallFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bytes calldata _payload,
        uint64 _dstGasForCall,
        bool _useZro,
        bytes calldata _adapterParams
    ) public view virtual override returns (uint nativeFee, uint zroFee) {
        return _estimateSendAndCallFee(_dstChainId, _toAddress, _amount, _payload, _dstGasForCall, _useZro, _adapterParams);
    }

    function circulatingSupply() public view virtual override returns (uint);

    function token() public view virtual override returns (address);
}

// File: @layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/ICommonOFT.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface ICommonOFT is IERC165 {

    struct LzCallParams {
        address payable refundAddress;
        address zroPaymentAddress;
        bytes adapterParams;
    }

    /**
     * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`)
     * _dstChainId - L0 defined chain id to send tokens too
     * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain
     * _amount - amount of the tokens to transfer
     * _useZro - indicates to use zro to pay L0 fees
     * _adapterParam - flexible bytes array to indicate messaging adapter services in L0
     */
    function estimateSendFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);

    function estimateSendAndCallFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);

    /**
     * @dev returns the circulating amount of tokens on current chain
     */
    function circulatingSupply() external view returns (uint);

    /**
     * @dev returns the address of the ERC20 token
     */
    function token() external view returns (address);
}

// File: @layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/IOFTReceiverV2.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

interface IOFTReceiverV2 {
    /**
     * @dev Called by the OFT contract when tokens are received from source chain.
     * @param _srcChainId The chain id of the source chain.
     * @param _srcAddress The address of the OFT token contract on the source chain.
     * @param _nonce The nonce of the transaction on the source chain.
     * @param _from The address of the account who calls the sendAndCall() on the source chain.
     * @param _amount The amount of tokens to transfer.
     * @param _payload Additional data with no specified format.
     */
    function onOFTReceived(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes32 _from, uint _amount, bytes calldata _payload) external;
}

// File: @layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/IOFTV2.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ICommonOFT.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface IOFTV2 is ICommonOFT {

    /**
     * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from`
     * `_from` the owner of token
     * `_dstChainId` the destination chain identifier
     * `_toAddress` can be any size depending on the `dstChainId`.
     * `_amount` the quantity of tokens in wei
     * `_refundAddress` the address LayerZero refunds if too much message fee is sent
     * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token)
     * `_adapterParams` is a flexible bytes array to indicate messaging adapter services
     */
    function sendFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, LzCallParams calldata _callParams) external payable;

    function sendAndCall(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, LzCallParams calldata _callParams) external payable;
}

// File: @layerzerolabs/solidity-examples/contracts/token/oft/v2/OFTCoreV2.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../../lzApp/NonblockingLzApp.sol";
import "../../../libraries/ExcessivelySafeCall.sol";
import "./interfaces/ICommonOFT.sol";
import "./interfaces/IOFTReceiverV2.sol";

abstract contract OFTCoreV2 is NonblockingLzApp {
    using BytesLib for bytes;
    using ExcessivelySafeCall for address;

    uint public constant NO_EXTRA_GAS = 0;

    // packet type
    uint8 public constant PT_SEND = 0;
    uint8 public constant PT_SEND_AND_CALL = 1;

    uint8 public immutable sharedDecimals;

    mapping(uint16 => mapping(bytes => mapping(uint64 => bool))) public creditedPackets;

    /**
     * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
     * `_nonce` is the outbound nonce
     */
    event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes32 indexed _toAddress, uint _amount);

    /**
     * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.
     * `_nonce` is the inbound nonce.
     */
    event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint _amount);

    event CallOFTReceivedSuccess(uint16 indexed _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _hash);

    event NonContractAddress(address _address);

    // _sharedDecimals should be the minimum decimals on all chains
    constructor(uint8 _sharedDecimals, address _lzEndpoint) NonblockingLzApp(_lzEndpoint) {
        sharedDecimals = _sharedDecimals;
    }

    /************************************************************************
     * public functions
     ************************************************************************/
    function callOnOFTReceived(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes32 _from,
        address _to,
        uint _amount,
        bytes calldata _payload,
        uint _gasForCall
    ) public virtual {
        require(_msgSender() == address(this), "OFTCore: caller must be OFTCore");

        // send
        _amount = _transferFrom(address(this), _to, _amount);
        emit ReceiveFromChain(_srcChainId, _to, _amount);

        // call
        IOFTReceiverV2(_to).onOFTReceived{gas: _gasForCall}(_srcChainId, _srcAddress, _nonce, _from, _amount, _payload);
    }

    /************************************************************************
     * internal functions
     ************************************************************************/
    function _estimateSendFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bool _useZro,
        bytes memory _adapterParams
    ) internal view virtual returns (uint nativeFee, uint zroFee) {
        // mock the payload for sendFrom()
        bytes memory payload = _encodeSendPayload(_toAddress, _ld2sd(_amount));
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _estimateSendAndCallFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bytes memory _payload,
        uint64 _dstGasForCall,
        bool _useZro,
        bytes memory _adapterParams
    ) internal view virtual returns (uint nativeFee, uint zroFee) {
        // mock the payload for sendAndCall()
        bytes memory payload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(_amount), _payload, _dstGasForCall);
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _nonblockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual override {
        uint8 packetType = _payload.toUint8(0);

        if (packetType == PT_SEND) {
            _sendAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else if (packetType == PT_SEND_AND_CALL) {
            _sendAndCallAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else {
            revert("OFTCore: unknown packet type");
        }
    }

    function _send(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal virtual returns (uint amount) {
        _checkGasLimit(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);

        (amount, ) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount); // amount returned should not have dust
        require(amount > 0, "OFTCore: amount too small");

        bytes memory lzPayload = _encodeSendPayload(_toAddress, _ld2sd(amount));
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAck(
        uint16 _srcChainId,
        bytes memory,
        uint64,
        bytes memory _payload
    ) internal virtual {
        (address to, uint64 amountSD) = _decodeSendPayload(_payload);
        if (to == address(0)) {
            to = address(0xdead);
        }

        uint amount = _sd2ld(amountSD);
        amount = _creditTo(_srcChainId, to, amount);

        emit ReceiveFromChain(_srcChainId, to, amount);
    }

    function _sendAndCall(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount,
        bytes memory _payload,
        uint64 _dstGasForCall,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal virtual returns (uint amount) {
        _checkGasLimit(_dstChainId, PT_SEND_AND_CALL, _adapterParams, _dstGasForCall);

        (amount, ) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount);
        require(amount > 0, "OFTCore: amount too small");

        // encode the msg.sender into the payload instead of _from
        bytes memory lzPayload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(amount), _payload, _dstGasForCall);
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAndCallAck(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual {
        (bytes32 from, address to, uint64 amountSD, bytes memory payloadForCall, uint64 gasForCall) = _decodeSendAndCallPayload(_payload);

        bool credited = creditedPackets[_srcChainId][_srcAddress][_nonce];
        uint amount = _sd2ld(amountSD);

        // credit to this contract first, and then transfer to receiver only if callOnOFTReceived() succeeds
        if (!credited) {
            amount = _creditTo(_srcChainId, address(this), amount);
            creditedPackets[_srcChainId][_srcAddress][_nonce] = true;
        }

        if (!_isContract(to)) {
            emit NonContractAddress(to);
            return;
        }

        // workaround for stack too deep
        uint16 srcChainId = _srcChainId;
        bytes memory srcAddress = _srcAddress;
        uint64 nonce = _nonce;
        bytes memory payload = _payload;
        bytes32 from_ = from;
        address to_ = to;
        uint amount_ = amount;
        bytes memory payloadForCall_ = payloadForCall;

        // no gas limit for the call if retry
        uint gas = credited ? gasleft() : gasForCall;
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(
            gasleft(),
            150,
            abi.encodeWithSelector(this.callOnOFTReceived.selector, srcChainId, srcAddress, nonce, from_, to_, amount_, payloadForCall_, gas)
        );

        if (success) {
            bytes32 hash = keccak256(payload);
            emit CallOFTReceivedSuccess(srcChainId, srcAddress, nonce, hash);
        } else {
            // store the failed message into the nonblockingLzApp
            _storeFailedMessage(srcChainId, srcAddress, nonce, payload, reason);
        }
    }

    function _isContract(address _account) internal view returns (bool) {
        return _account.code.length > 0;
    }

    function _ld2sd(uint _amount) internal view virtual returns (uint64) {
        uint amountSD = _amount / _ld2sdRate();
        require(amountSD <= type(uint64).max, "OFTCore: amountSD overflow");
        return uint64(amountSD);
    }

    function _sd2ld(uint64 _amountSD) internal view virtual returns (uint) {
        return _amountSD * _ld2sdRate();
    }

    function _removeDust(uint _amount) internal view virtual returns (uint amountAfter, uint dust) {
        dust = _amount % _ld2sdRate();
        amountAfter = _amount - dust;
    }

    function _encodeSendPayload(bytes32 _toAddress, uint64 _amountSD) internal view virtual returns (bytes memory) {
        return abi.encodePacked(PT_SEND, _toAddress, _amountSD);
    }

    function _decodeSendPayload(bytes memory _payload) internal view virtual returns (address to, uint64 amountSD) {
        require(_payload.toUint8(0) == PT_SEND && _payload.length == 41, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
    }

    function _encodeSendAndCallPayload(
        address _from,
        bytes32 _toAddress,
        uint64 _amountSD,
        bytes memory _payload,
        uint64 _dstGasForCall
    ) internal view virtual returns (bytes memory) {
        return abi.encodePacked(PT_SEND_AND_CALL, _toAddress, _amountSD, _addressToBytes32(_from), _dstGasForCall, _payload);
    }

    function _decodeSendAndCallPayload(bytes memory _payload)
        internal
        view
        virtual
        returns (
            bytes32 from,
            address to,
            uint64 amountSD,
            bytes memory payload,
            uint64 dstGasForCall
        )
    {
        require(_payload.toUint8(0) == PT_SEND_AND_CALL, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
        from = _payload.toBytes32(41);
        dstGasForCall = _payload.toUint64(73);
        payload = _payload.slice(81, _payload.length - 81);
    }

    function _addressToBytes32(address _address) internal pure virtual returns (bytes32) {
        return bytes32(uint(uint160(_address)));
    }

    function _debitFrom(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint _amount
    ) internal virtual returns (uint);

    function _creditTo(
        uint16 _srcChainId,
        address _toAddress,
        uint _amount
    ) internal virtual returns (uint);

    function _transferFrom(
        address _from,
        address _to,
        uint _amount
    ) internal virtual returns (uint);

    function _ld2sdRate() internal view virtual returns (uint);
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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);
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol



// 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());
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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);
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @venusprotocol/oracle/contracts/interfaces/OracleInterface.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

interface OracleInterface {
    function getPrice(address asset) external view returns (uint256);
}

interface ResilientOracleInterface is OracleInterface {
    function updatePrice(address vToken) external;

    function updateAssetPrice(address asset) external;

    function getUnderlyingPrice(address vToken) external view returns (uint256);
}

interface TwapInterface is OracleInterface {
    function updateTwap(address asset) external returns (uint256);
}

interface BoundValidatorInterface {
    function validatePriceWithAnchorPrice(
        address asset,
        uint256 reporterPrice,
        uint256 anchorPrice
    ) external view returns (bool);
}

// File: @venusprotocol/solidity-utilities/contracts/constants.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

/// @dev Base unit for computations, usually used in scaling (multiplications, divisions)
uint256 constant EXP_SCALE = 1e18;

/// @dev A unit (literal one) in EXP_SCALE, usually used in additions/subtractions
uint256 constant MANTISSA_ONE = EXP_SCALE;

// File: @venusprotocol/solidity-utilities/contracts/ExponentialNoError.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

import { EXP_SCALE as EXP_SCALE_, MANTISSA_ONE as MANTISSA_ONE_ } from "./constants.sol";

/**
 * @title Exponential module for storing fixed-precision decimals
 * @author Compound
 * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places.
 *         Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is:
 *         `Exp({mantissa: 5100000000000000000})`.
 */
contract ExponentialNoError {
    struct Exp {
        uint256 mantissa;
    }

    struct Double {
        uint256 mantissa;
    }

    uint256 internal constant EXP_SCALE = EXP_SCALE_;
    uint256 internal constant DOUBLE_SCALE = 1e36;
    uint256 internal constant HALF_EXP_SCALE = EXP_SCALE / 2;
    uint256 internal constant MANTISSA_ONE = MANTISSA_ONE_;

    /**
     * @dev Truncates the given exp to a whole number value.
     *      For example, truncate(Exp{mantissa: 15 * EXP_SCALE}) = 15
     */
    function truncate(Exp memory exp) internal pure returns (uint256) {
        // Note: We are not using careful math here as we're performing a division that cannot fail
        return exp.mantissa / EXP_SCALE;
    }

    /**
     * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
     */
    // solhint-disable-next-line func-name-mixedcase
    function mul_ScalarTruncate(Exp memory a, uint256 scalar) internal pure returns (uint256) {
        Exp memory product = mul_(a, scalar);
        return truncate(product);
    }

    /**
     * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
     */
    // solhint-disable-next-line func-name-mixedcase
    function mul_ScalarTruncateAddUInt(Exp memory a, uint256 scalar, uint256 addend) internal pure returns (uint256) {
        Exp memory product = mul_(a, scalar);
        return add_(truncate(product), addend);
    }

    /**
     * @dev Checks if first Exp is less than second Exp.
     */
    function lessThanExp(Exp memory left, Exp memory right) internal pure returns (bool) {
        return left.mantissa < right.mantissa;
    }

    function safe224(uint256 n, string memory errorMessage) internal pure returns (uint224) {
        require(n <= type(uint224).max, errorMessage);
        return uint224(n);
    }

    function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
        require(n <= type(uint32).max, errorMessage);
        return uint32(n);
    }

    function add_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({ mantissa: add_(a.mantissa, b.mantissa) });
    }

    function add_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({ mantissa: add_(a.mantissa, b.mantissa) });
    }

    function add_(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({ mantissa: sub_(a.mantissa, b.mantissa) });
    }

    function sub_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({ mantissa: sub_(a.mantissa, b.mantissa) });
    }

    function sub_(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({ mantissa: mul_(a.mantissa, b.mantissa) / EXP_SCALE });
    }

    function mul_(Exp memory a, uint256 b) internal pure returns (Exp memory) {
        return Exp({ mantissa: mul_(a.mantissa, b) });
    }

    function mul_(uint256 a, Exp memory b) internal pure returns (uint256) {
        return mul_(a, b.mantissa) / EXP_SCALE;
    }

    function mul_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({ mantissa: mul_(a.mantissa, b.mantissa) / DOUBLE_SCALE });
    }

    function mul_(Double memory a, uint256 b) internal pure returns (Double memory) {
        return Double({ mantissa: mul_(a.mantissa, b) });
    }

    function mul_(uint256 a, Double memory b) internal pure returns (uint256) {
        return mul_(a, b.mantissa) / DOUBLE_SCALE;
    }

    function mul_(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({ mantissa: div_(mul_(a.mantissa, EXP_SCALE), b.mantissa) });
    }

    function div_(Exp memory a, uint256 b) internal pure returns (Exp memory) {
        return Exp({ mantissa: div_(a.mantissa, b) });
    }

    function div_(uint256 a, Exp memory b) internal pure returns (uint256) {
        return div_(mul_(a, EXP_SCALE), b.mantissa);
    }

    function div_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({ mantissa: div_(mul_(a.mantissa, DOUBLE_SCALE), b.mantissa) });
    }

    function div_(Double memory a, uint256 b) internal pure returns (Double memory) {
        return Double({ mantissa: div_(a.mantissa, b) });
    }

    function div_(uint256 a, Double memory b) internal pure returns (uint256) {
        return div_(mul_(a, DOUBLE_SCALE), b.mantissa);
    }

    function div_(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function fraction(uint256 a, uint256 b) internal pure returns (Double memory) {
        return Double({ mantissa: div_(mul_(a, DOUBLE_SCALE), b) });
    }
}

// File: @venusprotocol/solidity-utilities/contracts/validators.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

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

/// @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();
    }
}

// File: contracts/Bridge/BaseXVSProxyOFT.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

import { SafeERC20, IERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { ResilientOracleInterface } from "@venusprotocol/oracle/contracts/interfaces/OracleInterface.sol";
import { Pausable } from "@openzeppelin/contracts/security/Pausable.sol";
import { BaseOFTV2 } from "@layerzerolabs/solidity-examples/contracts/token/oft/v2/BaseOFTV2.sol";
import { ensureNonzeroAddress } from "@venusprotocol/solidity-utilities/contracts/validators.sol";
import { ExponentialNoError } from "@venusprotocol/solidity-utilities/contracts/ExponentialNoError.sol";

/**
 * @title BaseXVSProxyOFT
 * @author Venus
 * @notice The BaseXVSProxyOFT contract is tailored for facilitating cross-chain transactions with an ERC20 token.
 * It manages transaction limits of a single and daily transactions.
 * This contract inherits key functionalities from other contracts, including pausing capabilities and error handling.
 * It holds state variables for the inner token and maps for tracking transaction limits and statistics across various chains and addresses.
 * The contract allows the owner to configure limits, set whitelists, and control pausing.
 * Internal functions conduct eligibility check of transactions, making the contract a fundamental component for cross-chain token management.
 */

abstract contract BaseXVSProxyOFT is Pausable, ExponentialNoError, BaseOFTV2 {
    using SafeERC20 for IERC20;
    IERC20 internal immutable innerToken;
    uint256 internal immutable ld2sdRate;
    bool public sendAndCallEnabled;

    /**
     * @notice The address of ResilientOracle contract wrapped in its interface.
     */
    ResilientOracleInterface public oracle;
    /**
     * @notice Maximum limit for a single transaction in USD(scaled with 18 decimals) from local chain.
     */
    mapping(uint16 => uint256) public chainIdToMaxSingleTransactionLimit;
    /**
     * @notice Maximum daily limit for transactions in USD(scaled with 18 decimals) from local chain.
     */
    mapping(uint16 => uint256) public chainIdToMaxDailyLimit;
    /**
     * @notice Total sent amount in USD(scaled with 18 decimals) within the last 24-hour window from local chain.
     */
    mapping(uint16 => uint256) public chainIdToLast24HourTransferred;
    /**
     * @notice Timestamp when the last 24-hour window started from local chain.
     */
    mapping(uint16 => uint256) public chainIdToLast24HourWindowStart;
    /**
     * @notice Maximum limit for a single receive transaction in USD(scaled with 18 decimals) from remote chain.
     */
    mapping(uint16 => uint256) public chainIdToMaxSingleReceiveTransactionLimit;
    /**
     * @notice Maximum daily limit for receiving transactions in USD(scaled with 18 decimals) from remote chain.
     */
    mapping(uint16 => uint256) public chainIdToMaxDailyReceiveLimit;
    /**
     * @notice Total received amount in USD(scaled with 18 decimals) within the last 24-hour window from remote chain.
     */
    mapping(uint16 => uint256) public chainIdToLast24HourReceived;
    /**
     * @notice Timestamp when the last 24-hour window started from remote chain.
     */
    mapping(uint16 => uint256) public chainIdToLast24HourReceiveWindowStart;
    /**
     * @notice Address on which cap check and bound limit is not applicable.
     */
    mapping(address => bool) public whitelist;

    /**
     * @notice Emitted when address is added to whitelist.
     */
    event SetWhitelist(address indexed addr, bool isWhitelist);
    /**
     * @notice  Emitted when the maximum limit for a single transaction from local chain is modified.
     */
    event SetMaxSingleTransactionLimit(uint16 chainId, uint256 oldMaxLimit, uint256 newMaxLimit);
    /**
     * @notice Emitted when the maximum daily limit of transactions from local chain is modified.
     */
    event SetMaxDailyLimit(uint16 chainId, uint256 oldMaxLimit, uint256 newMaxLimit);
    /**
     * @notice Emitted when the maximum limit for a single receive transaction from remote chain is modified.
     */
    event SetMaxSingleReceiveTransactionLimit(uint16 chainId, uint256 oldMaxLimit, uint256 newMaxLimit);
    /**
     * @notice Emitted when the maximum daily limit for receiving transactions from remote chain is modified.
     */
    event SetMaxDailyReceiveLimit(uint16 chainId, uint256 oldMaxLimit, uint256 newMaxLimit);
    /**
     * @notice Event emitted when oracle is modified.
     */
    event OracleChanged(address indexed oldOracle, address indexed newOracle);
    /**
     * @notice Event emitted when trusted remote sets to empty.
     */
    event TrustedRemoteRemoved(uint16 chainId);
    /**
     * @notice Event emitted when inner token set successfully.
     */
    event InnerTokenAdded(address indexed innerToken);
    /**
     *@notice Emitted on sweep token success
     */
    event SweepToken(address indexed token, address indexed to, uint256 sweepAmount);
    /**
     * @notice Event emitted when SendAndCallEnabled updated successfully.
     */
    event UpdateSendAndCallEnabled(bool indexed enabled);
    /**
     *@notice Error thrown when this contract balance is less than sweep amount
     */
    error InsufficientBalance(uint256 sweepAmount, uint256 balance);

    /**
     * @param tokenAddress_ Address of the inner token.
     * @param sharedDecimals_ Number of shared decimals.
     * @param lzEndpoint_ Address of the layer zero endpoint contract.
     * @param oracle_ Address of the price oracle.
     * @custom:error ZeroAddressNotAllowed is thrown when token contract address is zero.
     * @custom:error ZeroAddressNotAllowed is thrown when lzEndpoint contract address is zero.
     * @custom:error ZeroAddressNotAllowed is thrown when oracle contract address is zero.
     * @custom:event Emits InnerTokenAdded with token address.
     * @custom:event Emits OracleChanged with zero address and oracle address.
     */
    constructor(
        address tokenAddress_,
        uint8 sharedDecimals_,
        address lzEndpoint_,
        address oracle_
    ) BaseOFTV2(sharedDecimals_, lzEndpoint_) {
        ensureNonzeroAddress(tokenAddress_);
        ensureNonzeroAddress(lzEndpoint_);
        ensureNonzeroAddress(oracle_);

        innerToken = IERC20(tokenAddress_);

        (bool success, bytes memory data) = tokenAddress_.staticcall(abi.encodeWithSignature("decimals()"));
        require(success, "ProxyOFT: failed to get token decimals");
        uint8 decimals = abi.decode(data, (uint8));

        require(sharedDecimals_ <= decimals, "ProxyOFT: sharedDecimals must be <= decimals");
        ld2sdRate = 10 ** (decimals - sharedDecimals_);

        emit InnerTokenAdded(tokenAddress_);
        emit OracleChanged(address(0), oracle_);

        oracle = ResilientOracleInterface(oracle_);
    }

    /**
     * @notice Set the address of the ResilientOracle contract.
     * @dev Reverts if the new address is zero.
     * @param oracleAddress_ The new address of the ResilientOracle contract.
     * @custom:access Only owner.
     * @custom:event Emits OracleChanged with old and new oracle address.
     */
    function setOracle(address oracleAddress_) external onlyOwner {
        ensureNonzeroAddress(oracleAddress_);
        emit OracleChanged(address(oracle), oracleAddress_);
        oracle = ResilientOracleInterface(oracleAddress_);
    }

    /**
     * @notice Sets the limit of single transaction amount.
     * @param chainId_ Destination chain id.
     * @param limit_ Amount in USD(scaled with 18 decimals).
     * @custom:access Only owner.
     * @custom:event Emits SetMaxSingleTransactionLimit with old and new limit associated with chain id.
     */
    function setMaxSingleTransactionLimit(uint16 chainId_, uint256 limit_) external onlyOwner {
        require(limit_ <= chainIdToMaxDailyLimit[chainId_], "Single transaction limit > Daily limit");
        emit SetMaxSingleTransactionLimit(chainId_, chainIdToMaxSingleTransactionLimit[chainId_], limit_);
        chainIdToMaxSingleTransactionLimit[chainId_] = limit_;
    }

    /**
     * @notice Sets the limit of daily (24 Hour) transactions amount.
     * @param chainId_ Destination chain id.
     * @param limit_ Amount in USD(scaled with 18 decimals).
     * @custom:access Only owner.
     * @custom:event Emits setMaxDailyLimit with old and new limit associated with chain id.
     */
    function setMaxDailyLimit(uint16 chainId_, uint256 limit_) external onlyOwner {
        require(limit_ >= chainIdToMaxSingleTransactionLimit[chainId_], "Daily limit < single transaction limit");
        emit SetMaxDailyLimit(chainId_, chainIdToMaxDailyLimit[chainId_], limit_);
        chainIdToMaxDailyLimit[chainId_] = limit_;
    }

    /**
     * @notice Sets the maximum limit for a single receive transaction.
     * @param chainId_ The destination chain ID.
     * @param limit_ The new maximum limit in USD(scaled with 18 decimals).
     * @custom:access Only owner.
     * @custom:event Emits setMaxSingleReceiveTransactionLimit with old and new limit associated with chain id.
     */
    function setMaxSingleReceiveTransactionLimit(uint16 chainId_, uint256 limit_) external onlyOwner {
        require(limit_ <= chainIdToMaxDailyReceiveLimit[chainId_], "single receive transaction limit > Daily limit");
        emit SetMaxSingleReceiveTransactionLimit(chainId_, chainIdToMaxSingleReceiveTransactionLimit[chainId_], limit_);
        chainIdToMaxSingleReceiveTransactionLimit[chainId_] = limit_;
    }

    /**
     * @notice Sets the maximum daily limit for receiving transactions.
     * @param chainId_ The destination chain ID.
     * @param limit_ The new maximum daily limit in USD(scaled with 18 decimals).
     * @custom:access Only owner.
     * @custom:event Emits setMaxDailyReceiveLimit with old and new limit associated with chain id.
     */
    function setMaxDailyReceiveLimit(uint16 chainId_, uint256 limit_) external onlyOwner {
        require(
            limit_ >= chainIdToMaxSingleReceiveTransactionLimit[chainId_],
            "Daily limit < single receive transaction limit"
        );
        emit SetMaxDailyReceiveLimit(chainId_, chainIdToMaxDailyReceiveLimit[chainId_], limit_);
        chainIdToMaxDailyReceiveLimit[chainId_] = limit_;
    }

    /**
     * @notice Sets the whitelist address to skip checks on transaction limit.
     * @param user_ Address to be add in whitelist.
     * @param val_ Boolean to be set (true for user_ address is whitelisted).
     * @custom:access Only owner.
     * @custom:event Emits setWhitelist.
     */
    function setWhitelist(address user_, bool val_) external onlyOwner {
        emit SetWhitelist(user_, val_);
        whitelist[user_] = val_;
    }

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

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

    /**
     * @notice A public function to sweep accidental ERC-20 transfers to this contract. Tokens are sent to user
     * @param token_ The address of the ERC-20 token to sweep
     * @param to_ The address of the recipient
     * @param amount_ The amount of tokens needs to transfer
     * @custom:event Emits SweepToken event
     * @custom:error Throw InsufficientBalance if amount_ is greater than the available balance of the token in the contract
     * @custom:access Only Owner
     */
    function sweepToken(IERC20 token_, address to_, uint256 amount_) external onlyOwner {
        uint256 balance = token_.balanceOf(address(this));
        if (amount_ > balance) {
            revert InsufficientBalance(amount_, balance);
        }

        emit SweepToken(address(token_), to_, amount_);

        token_.safeTransfer(to_, amount_);
    }

    /**
     * @notice Remove trusted remote from storage.
     * @param remoteChainId_ The chain's id corresponds to setting the trusted remote to empty.
     * @custom:access Only owner.
     * @custom:event Emits TrustedRemoteRemoved once chain id is removed from trusted remote.
     */
    function removeTrustedRemote(uint16 remoteChainId_) external onlyOwner {
        delete trustedRemoteLookup[remoteChainId_];
        emit TrustedRemoteRemoved(remoteChainId_);
    }

    /**
     * @notice It enables or disables sendAndCall functionality for the bridge.
     * @param enabled_ Boolean indicating whether the sendAndCall function should be enabled or disabled.
     */
    function updateSendAndCallEnabled(bool enabled_) external onlyOwner {
        sendAndCallEnabled = enabled_;
        emit UpdateSendAndCallEnabled(enabled_);
    }

    /**
     * @notice Checks the eligibility of a sender to initiate a cross-chain token transfer.
     * @dev This external view function assesses whether the specified sender is eligible to transfer the given amount
     *      to the specified destination chain. It considers factors such as whitelisting, transaction limits, and a 24-hour window.
     * @param from_ The sender's address initiating the transfer.
     * @param dstChainId_ Indicates destination chain.
     * @param amount_ The quantity of tokens to be transferred.
     * @return eligibleToSend A boolean indicating whether the sender is eligible to transfer the tokens.
     * @return maxSingleTransactionLimit The maximum limit for a single transaction.
     * @return maxDailyLimit The maximum daily limit for transactions.
     * @return amountInUsd The equivalent amount in USD based on the oracle price.
     * @return transferredInWindow The total amount transferred in the current 24-hour window.
     * @return last24HourWindowStart The timestamp when the current 24-hour window started.
     * @return isWhiteListedUser A boolean indicating whether the sender is whitelisted.
     */
    function isEligibleToSend(
        address from_,
        uint16 dstChainId_,
        uint256 amount_
    )
        external
        view
        returns (
            bool eligibleToSend,
            uint256 maxSingleTransactionLimit,
            uint256 maxDailyLimit,
            uint256 amountInUsd,
            uint256 transferredInWindow,
            uint256 last24HourWindowStart,
            bool isWhiteListedUser
        )
    {
        // Check if the sender's address is whitelisted
        isWhiteListedUser = whitelist[from_];

        // Calculate the amount in USD using the oracle price
        Exp memory oraclePrice = Exp({ mantissa: oracle.getPrice(token()) });
        amountInUsd = mul_ScalarTruncate(oraclePrice, amount_);

        // Load values for the 24-hour window checks
        uint256 currentBlockTimestamp = block.timestamp;
        last24HourWindowStart = chainIdToLast24HourWindowStart[dstChainId_];
        transferredInWindow = chainIdToLast24HourTransferred[dstChainId_];
        maxSingleTransactionLimit = chainIdToMaxSingleTransactionLimit[dstChainId_];
        maxDailyLimit = chainIdToMaxDailyLimit[dstChainId_];
        if (currentBlockTimestamp - last24HourWindowStart > 1 days) {
            transferredInWindow = amountInUsd;
            last24HourWindowStart = currentBlockTimestamp;
        } else {
            transferredInWindow += amountInUsd;
        }
        eligibleToSend = (isWhiteListedUser ||
            ((amountInUsd <= maxSingleTransactionLimit) && (transferredInWindow <= maxDailyLimit)));
    }

    /**
     * @notice Initiates a cross-chain token transfer and triggers a call on the destination chain.
     * @dev This internal override function enables the contract to send tokens and invoke calls on the specified
     *      destination chain. It checks whether the sendAndCall feature is enabled before proceeding with the transfer.
     * @param from_ Address from which tokens will be debited.
     * @param dstChainId_ Destination chain id on which tokens will be send.
     * @param toAddress_ Address on which tokens will be credited on destination chain.
     * @param amount_ Amount of tokens that will be transferred.
     * @param payload_ Additional data payload for the call on the destination chain.
     * @param dstGasForCall_ The amount of gas allocated for the call on the destination chain.
     * @param callparams_ Additional parameters, including refund address, ZRO payment address,
     *                   and adapter params.
     */
    function sendAndCall(
        address from_,
        uint16 dstChainId_,
        bytes32 toAddress_,
        uint256 amount_,
        bytes calldata payload_,
        uint64 dstGasForCall_,
        LzCallParams calldata callparams_
    ) public payable override {
        require(sendAndCallEnabled, "sendAndCall is disabled");

        super.sendAndCall(from_, dstChainId_, toAddress_, amount_, payload_, dstGasForCall_, callparams_);
    }

    function retryMessage(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) public payable override {
        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
        // it 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"
        );
        super.retryMessage(_srcChainId, _srcAddress, _nonce, _payload);
    }

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

    /**
     * @notice Return's the address of the inner token of this bridge.
     * @return Address of the inner token of this bridge.
     */
    function token() public view override returns (address) {
        return address(innerToken);
    }

    /**
     * @notice Checks if the sender is eligible to send tokens
     * @param from_ Sender's address sending tokens
     * @param dstChainId_ Chain id on which tokens should be sent
     * @param amount_ Amount of tokens to be sent
     */
    function _isEligibleToSend(address from_, uint16 dstChainId_, uint256 amount_) internal {
        // Check if the sender's address is whitelisted
        bool isWhiteListedUser = whitelist[from_];
        // Check if the user is whitelisted and return if true
        if (isWhiteListedUser) {
            return;
        }

        // Calculate the amount in USD using the oracle price
        uint256 amountInUsd;
        Exp memory oraclePrice = Exp({ mantissa: oracle.getPrice(token()) });
        amountInUsd = mul_ScalarTruncate(oraclePrice, amount_);

        // Load values for the 24-hour window checks
        uint256 currentBlockTimestamp = block.timestamp;
        uint256 lastDayWindowStart = chainIdToLast24HourWindowStart[dstChainId_];
        uint256 transferredInWindow = chainIdToLast24HourTransferred[dstChainId_];
        uint256 maxSingleTransactionLimit = chainIdToMaxSingleTransactionLimit[dstChainId_];
        uint256 maxDailyLimit = chainIdToMaxDailyLimit[dstChainId_];

        // Revert if the amount exceeds the single transaction limit
        require(amountInUsd <= maxSingleTransactionLimit, "Single Transaction Limit Exceed");

        // Check if the time window has changed (more than 24 hours have passed)
        if (currentBlockTimestamp - lastDayWindowStart > 1 days) {
            transferredInWindow = amountInUsd;
            chainIdToLast24HourWindowStart[dstChainId_] = currentBlockTimestamp;
        } else {
            transferredInWindow += amountInUsd;
        }

        // Revert if the amount exceeds the daily limit
        require(transferredInWindow <= maxDailyLimit, "Daily Transaction Limit Exceed");

        // Update the amount for the 24-hour window
        chainIdToLast24HourTransferred[dstChainId_] = transferredInWindow;
    }

    /**
     * @notice Checks if receiver is able to receive tokens
     * @param toAddress_ Receiver address
     * @param srcChainId_ Source chain id from which token is send
     * @param receivedAmount_ Amount of tokens received
     */
    function _isEligibleToReceive(address toAddress_, uint16 srcChainId_, uint256 receivedAmount_) internal {
        // Check if the recipient's address is whitelisted
        bool isWhiteListedUser = whitelist[toAddress_];
        // Check if the user is whitelisted and return if true
        if (isWhiteListedUser) {
            return;
        }

        // Calculate the received amount in USD using the oracle price
        uint256 receivedAmountInUsd;
        Exp memory oraclePrice = Exp({ mantissa: oracle.getPrice(address(token())) });
        receivedAmountInUsd = mul_ScalarTruncate(oraclePrice, receivedAmount_);

        uint256 currentBlockTimestamp = block.timestamp;

        // Load values for the 24-hour window checks for receiving
        uint256 lastDayReceiveWindowStart = chainIdToLast24HourReceiveWindowStart[srcChainId_];
        uint256 receivedInWindow = chainIdToLast24HourReceived[srcChainId_];
        uint256 maxSingleReceiveTransactionLimit = chainIdToMaxSingleReceiveTransactionLimit[srcChainId_];
        uint256 maxDailyReceiveLimit = chainIdToMaxDailyReceiveLimit[srcChainId_];

        // Check if the received amount exceeds the single transaction limit
        require(receivedAmountInUsd <= maxSingleReceiveTransactionLimit, "Single Transaction Limit Exceed");

        // Check if the time window has changed (more than 24 hours have passed)
        if (currentBlockTimestamp - lastDayReceiveWindowStart > 1 days) {
            receivedInWindow = receivedAmountInUsd;
            chainIdToLast24HourReceiveWindowStart[srcChainId_] = currentBlockTimestamp;
        } else {
            receivedInWindow += receivedAmountInUsd;
        }

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

        // Update the received amount for the 24-hour window
        chainIdToLast24HourReceived[srcChainId_] = receivedInWindow;
    }

    /**
     * @notice Transfer tokens from sender to receiver account.
     * @param from_ Address from which token has to be transferred(Sender).
     * @param to_ Address on which token will be tranferred(Receiver).
     * @param amount_ Amount of token to be transferred.
     * @return Actual balance difference.
     */
    function _transferFrom(
        address from_,
        address to_,
        uint256 amount_
    ) internal override whenNotPaused returns (uint256) {
        uint256 before = innerToken.balanceOf(to_);
        if (from_ == address(this)) {
            innerToken.safeTransfer(to_, amount_);
        } else {
            innerToken.safeTransferFrom(from_, to_, amount_);
        }
        return innerToken.balanceOf(to_) - before;
    }

    /**
     * @notice Returns Conversion rate factor from large decimals to shared decimals.
     * @return Conversion rate factor.
     */
    function _ld2sdRate() internal view override returns (uint256) {
        return ld2sdRate;
    }
}

// File: contracts/Bridge/interfaces/IXVS.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

/**
 * @title IXVS
 * @author Venus
 * @notice Interface implemented by `XVS` token.
 */
interface IXVS {
    function mint(address to, uint256 amount) external;

    function burn(address from, uint256 amount) external;
}

// File: contracts/Bridge/XVSProxyOFTDest.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

import { IXVS } from "./interfaces/IXVS.sol";
import { BaseXVSProxyOFT } from "./BaseXVSProxyOFT.sol";

/**
 * @title XVSProxyOFTDest
 * @author Venus
 * @notice XVSProxyOFTDest contract builds upon the functionality of its parent contract, BaseXVSProxyOFT,
 * and focuses on managing token transfers to the destination chain.
 * It provides functions to check eligibility and perform the actual token transfers while maintaining strict access controls and pausing mechanisms.
 */

contract XVSProxyOFTDest is BaseXVSProxyOFT {
    /**
     * @notice Emits when stored message dropped without successful retrying.
     */
    event DropFailedMessage(uint16 srcChainId, bytes indexed srcAddress, uint64 nonce);

    constructor(
        address tokenAddress_,
        uint8 sharedDecimals_,
        address lzEndpoint_,
        address oracle_
    ) BaseXVSProxyOFT(tokenAddress_, sharedDecimals_, lzEndpoint_, oracle_) {}

    /**
     * @notice Clear failed messages from the storage.
     * @param srcChainId_ Chain id of source
     * @param srcAddress_ Address of source followed by current bridge address
     * @param nonce_ Nonce_ of the transaction
     * @custom:access Only owner
     * @custom:event Emits DropFailedMessage on clearance of failed message.
     */
    function dropFailedMessage(uint16 srcChainId_, bytes memory srcAddress_, uint64 nonce_) external onlyOwner {
        failedMessages[srcChainId_][srcAddress_][nonce_] = bytes32(0);
        emit DropFailedMessage(srcChainId_, srcAddress_, nonce_);
    }

    /**
     * @notice Returns the total circulating supply of the token on the destination chain i.e (total supply).
     * @return total circulating supply of the token on the destination chain.
     */
    function circulatingSupply() public view override returns (uint256) {
        return innerToken.totalSupply();
    }

    /**
     * @notice Debit tokens from the given address
     * @param from_  Address from which tokens to be debited
     * @param dstChainId_ Destination chain id
     * @param amount_ Amount of tokens to be debited
     * @return Actual amount debited
     */
    function _debitFrom(
        address from_,
        uint16 dstChainId_,
        bytes32,
        uint256 amount_
    ) internal override whenNotPaused returns (uint256) {
        require(from_ == _msgSender(), "ProxyOFT: owner is not send caller");
        _isEligibleToSend(from_, dstChainId_, amount_);
        IXVS(address(innerToken)).burn(from_, amount_);
        return amount_;
    }

    /**
     * @notice Credit tokens in the given account
     * @param srcChainId_  Source chain id
     * @param toAddress_ Address on which token will be credited
     * @param amount_ Amount of tokens to be credited
     * @return Actual amount credited
     */
    function _creditTo(
        uint16 srcChainId_,
        address toAddress_,
        uint256 amount_
    ) internal override whenNotPaused returns (uint256) {
        _isEligibleToReceive(toAddress_, srcChainId_, amount_);
        IXVS(address(innerToken)).mint(toAddress_, amount_);
        return amount_;
    }
}