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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import {SimpleLzApp} from "./SimpleLzApp.sol";

contract GasStation is SimpleLzApp {
    struct SendInfo {
        uint16 dstChainId;
        uint256 nativeAmount;
    }

    constructor(address _lzEndpoint) SimpleLzApp(_lzEndpoint) {}

    uint256 _commonStationFee;
    mapping(uint16 => uint256) _stationFee;

    function useGasStation(
        SendInfo[] calldata sendInfos,
        address to
    ) external payable {
        uint256 fee;
        for (uint256 i = 0; i < sendInfos.length; i++) {
            fee += _sendNative(sendInfos[i], to);
        }
        require(msg.value >= fee, "Fee Not Met");
    }

    function estimateFees(
        uint16 _dstChainId,
        bytes memory _adapterParams
    ) public view returns (uint256 nativeFee) {
        (nativeFee, ) = lzEndpoint.estimateFees(
            _dstChainId,
            address(this),
            "",
            false,
            _adapterParams
        );
        nativeFee += _stationFee[_dstChainId] + _commonStationFee;
    }

    function _sendNative(
        SendInfo memory sendInfo,
        address _to
    ) internal returns (uint256 fee) {
        bytes memory adapterParams = createAdapterParams(
            sendInfo.dstChainId,
            sendInfo.nativeAmount,
            _to
        );

        fee = estimateFees(sendInfo.dstChainId, adapterParams);
        _lzSend(sendInfo.dstChainId, "", payable(this), adapterParams, fee);
    }

    function createAdapterParams(
        uint16 dstChainId,
        uint256 nativeAmount,
        address to
    ) public view returns (bytes memory) {
        return
            abi.encodePacked(
                uint16(2),
                getGasLimit(dstChainId),
                nativeAmount,
                to
            );
    }

    function withdraw(address token, uint256 amount) external onlyOwner {
        bool s;
        if (token == address(0)) {
            (s, ) = msg.sender.call{value: amount}("");
        } else {
            (s, ) = token.call(
                abi.encodeWithSignature(
                    "transfer(address,uint256)",
                    msg.sender,
                    amount
                )
            );
        }
        require(s, "Withdraw Failed");
    }

    function setStationFee(
        uint256 commonFee,
        uint16[] calldata chainIds,
        uint256[] calldata fees
    ) external onlyOwner {
        _commonStationFee = commonFee;
        for (uint256 i = 0; i < chainIds.length; i++) {
            _stationFee[chainIds[i]] = fees[i];
        }
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ILayerZeroUserApplicationConfig.sol";

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes calldata _payload
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
    }
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import {ILayerZeroEndpoint} from "@layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroEndpoint.sol";
import {ILayerZeroReceiver} from "@layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroReceiver.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

abstract contract SimpleLzApp is Ownable, ILayerZeroReceiver {
    ILayerZeroEndpoint public immutable lzEndpoint;

    mapping(uint16 => bytes) public trustedRemoteLookup;
    mapping(uint16 => uint256) public gasLimitLookup;

    uint256 public defaultGasLimit = 20_000;

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

    function lzReceive(
        uint16,
        bytes calldata,
        uint64,
        bytes calldata
    ) external virtual override {
        return;
    }

    function _lzSend(
        uint16 _dstChainId,
        bytes memory _payload,
        address payable _refundAddress,
        bytes memory _adapterParams,
        uint _nativeFee
    ) internal virtual {
        bytes memory trustedRemote = getTrusted(_dstChainId);
        lzEndpoint.send{value: _nativeFee}(
            _dstChainId,
            trustedRemote,
            _payload,
            _refundAddress,
            address(0),
            _adapterParams
        );
    }

    function getTrusted(
        uint16 _dstChainId
    ) internal view returns (bytes memory) {
        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
        if (trustedRemote.length == 0) {
            return abi.encodePacked(address(this), address(this));
        } else {
            return trustedRemote;
        }
    }

    function getGasLimit(uint16 _dstChainId) internal view returns (uint256) {
        uint256 gasLimit = gasLimitLookup[_dstChainId];
        if (gasLimit == 0) {
            return defaultGasLimit;
        } else {
            return gasLimit;
        }
    }

    function setTrusted(
        uint16[] calldata _remoteChainIds,
        address[] calldata _remoteAddresses
    ) external onlyOwner {
        require(
            _remoteChainIds.length == _remoteAddresses.length,
            "Length Mismatch"
        );

        for (uint i; i < _remoteChainIds.length; i++) {
            trustedRemoteLookup[_remoteChainIds[i]] = abi.encodePacked(
                _remoteAddresses[i],
                address(this)
            );
        }
    }

    function setGasLimit(
        uint16[] calldata _remoteChainIds,
        uint256[] calldata _gasLimits
    ) external onlyOwner {
        require(_remoteChainIds.length == _gasLimits.length, "Length Mismatch");

        for (uint i; i < _remoteChainIds.length; i++) {
            gasLimitLookup[_remoteChainIds[i]] = _gasLimits[i];
        }
    }

    function setDefaultGasLimit(uint256 _defaultGasLimit) external onlyOwner {
        defaultGasLimit = _defaultGasLimit;
    }

    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint _configType,
        bytes calldata _config
    ) external onlyOwner {
        lzEndpoint.setConfig(_version, _chainId, _configType, _config);
    }
}

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

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000000000000000000000000b6319cc6c8c27a8f5daf0dd3df91ea35c4720dd7

-----Decoded View---------------
Arg [0] : _lzEndpoint (address): 0xb6319cC6c8c27A8F5dAF0dD3DF91EA35C4720dd7

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b6319cc6c8c27a8f5daf0dd3df91ea35c4720dd7