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

// Contracts
import {CrossChainRateProvider} from "./core/CrossChainRateProvider.sol";

// Interfaces
import {IRocketTokenRETH} from "./interfaces/IRocketTokenRETH.sol";

/// @title rETH cross chain rate provider
/// @author witherblock
/// @notice Provides the current exchange rate of rETH to a receiver contract on a different chain than the one this contract is deployed on
contract REthRateProvider is CrossChainRateProvider {
    constructor(uint16 _dstChainId, address _layerZeroEndpoint) {
        rateInfo = RateInfo({
            tokenSymbol: "rETH",
            tokenAddress: 0xae78736Cd615f374D3085123A210448E74Fc6393,
            baseTokenSymbol: "ETH",
            baseTokenAddress: address(0) // Address 0 for native tokens
        });
        dstChainId = _dstChainId;
        layerZeroEndpoint = _layerZeroEndpoint;
    }

    /// @notice Returns the latest rate from the rETH contract
    function getLatestRate() public view override returns (uint256) {
        return
            IRocketTokenRETH(0xae78736Cd615f374D3085123A210448E74Fc6393)
                .getExchangeRate();
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

import {ILayerZeroEndpoint} from "../interfaces/ILayerZeroEndpoint.sol";

/// @title Cross chain rate provider
/// @author witherblock
/// @notice Provides a rate to a receiver contract on a different chain than the one this contract is deployed on
/// @dev Powered using LayerZero
abstract contract CrossChainRateProvider is Ownable, ReentrancyGuard {
    /// @notice Last rate updated on the provider
    uint256 public rate;

    /// @notice Last time rate was updated
    uint256 public lastUpdated;

    /// @notice Destination chainId
    uint16 public dstChainId;

    /// @notice LayerZero endpoint address
    address public layerZeroEndpoint;

    /// @notice Rate Reciever address address
    address public rateReceiver;

    /// @notice Information of which token and base token rate is being provided
    RateInfo public rateInfo;

    struct RateInfo {
        string tokenSymbol;
        address tokenAddress;
        string baseTokenSymbol;
        address baseTokenAddress;
    }

    /// @notice Emitted when rate is updated
    /// @param newRate the rate that was updated
    event RateUpdated(uint256 newRate);

    /// @notice Emitted when LayerZero Endpoint is updated
    /// @param newLayerZeroEndpoint the LayerZero Endpoint address that was updated
    event LayerZeroEndpointUpdated(address newLayerZeroEndpoint);

    /// @notice Emitted when RateReceiver is updated
    /// @param newRateReceiver the RateReceiver address that was updated
    event RateReceiverUpdated(address newRateReceiver);

    /// @notice Emitted when the destination chainId is updated
    /// @param newDstChainId the destination chainId that was updated
    event DstChainIdUpdated(uint16 newDstChainId);

    /// @notice Updates the LayerZero Endpoint address
    /// @dev Can only be called by owner
    /// @param _layerZeroEndpoint the new layer zero endpoint address
    function updateLayerZeroEndpoint(
        address _layerZeroEndpoint
    ) external onlyOwner {
        layerZeroEndpoint = _layerZeroEndpoint;

        emit LayerZeroEndpointUpdated(_layerZeroEndpoint);
    }

    /// @notice Updates the RateReceiver address
    /// @dev Can only be called by owner
    /// @param _rateReceiver the new rate receiver address
    function updateRateReceiver(address _rateReceiver) external onlyOwner {
        rateReceiver = _rateReceiver;

        emit RateReceiverUpdated(_rateReceiver);
    }

    /// @notice Updates the destination chainId
    /// @dev Can only be called by owner
    /// @param _dstChainId the destination chainId
    function updateDstChainId(uint16 _dstChainId) external onlyOwner {
        dstChainId = _dstChainId;

        emit DstChainIdUpdated(_dstChainId);
    }

    /// @notice Updates rate in this contract and on the receiver
    /// @dev This function is set to payable to pay for gas on execute lzReceive (on the receiver contract)
    /// on the destination chain. To compute the correct value to send check here - https://layerzero.gitbook.io/docs/evm-guides/code-examples/estimating-message-fees
    function updateRate() external payable nonReentrant {
        uint256 latestRate = getLatestRate();

        bytes memory remoteAndLocalAddresses = abi.encodePacked(
            rateReceiver,
            address(this)
        );

        rate = latestRate;

        lastUpdated = block.timestamp;

        bytes memory _payload = abi.encode(latestRate);

        ILayerZeroEndpoint(layerZeroEndpoint).send{value: msg.value}(
            dstChainId,
            remoteAndLocalAddresses,
            _payload,
            payable(msg.sender),
            address(0x0),
            bytes("")
        );

        emit RateUpdated(rate);
    }

    /// @notice Returns the latest rate
    function getLatestRate() public view virtual returns (uint256) {}
}

// 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 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
pragma solidity ^0.8.0;

interface IRocketTokenRETH {
    function getExchangeRate() external view returns (uint);
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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000000000000000000000000000000000000000000000000000000000000009e00000000000000000000000066a71dcef29a0ffbdbe3c6a460a3b5bc225cd675

-----Decoded View---------------
Arg [0] : _dstChainId (uint16): 158
Arg [1] : _layerZeroEndpoint (address): 0x66A71Dcef29A0fFBDBE3c6a460a3B5BC225Cd675

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000000009e
Arg [1] : 00000000000000000000000066a71dcef29a0ffbdbe3c6a460a3b5bc225cd675