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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "IERC20.sol";
import {Client} from "Client.sol";
import {CCIPReceiver} from "CCIPReceiver.sol";

contract MigrationReceiver is CCIPReceiver {
    // Event emitted when a message is received from another chain.
    // The unique ID of the CCIP message.
    // The chain selector of the source chain.
    // The address of the sender from the source chain.
    // The text that was received.
    // The token address that was transferred.
    // The token amount that was transferred.
    event RewardReceived(
        bytes32 indexed messageId,
        uint64 indexed sourceChainSelector,
        address sender,
        address token,
        uint256 tokenAmount
    );

    bytes32 private lastReceivedMessageId; // Store the last received messageId.
    address private lastReceivedTokenAddress; // Store the last received token address.
    uint256 private lastReceivedTokenAmount; // Store the last received amount.

    address public migrator;
    address public owner;

    // Custom errors to provide more descriptive revert messages.
    error SourceChainNotWhitelisted(uint64 sourceChainSelector); // Used when the source chain has not been whitelisted by the contract owner.
    error SenderNotWhitelisted(address sender); // Used when the sender has not been whitelisted by the contract owner.

    // Mapping to keep track of whitelisted source chains.
    uint64 public whitelistedSourceChain;
    address public whitelistedSender;

    /// @dev Modifier that checks if the chain with the given sourceChainSelector is whitelisted.
    /// @param _sourceChainSelector The selector of the destination chain.
    modifier onlyWhitelistedSourceChain(uint64 _sourceChainSelector) {
        if (whitelistedSourceChain != _sourceChainSelector) {
            revert SourceChainNotWhitelisted(_sourceChainSelector);
        }
        _;
    }

    /// @dev Modifier that checks if the chain with the given sourceChainSelector is whitelisted.
    /// @param _sender The address of the sender.
    modifier onlyWhitelistedSenders(address _sender) {
        if (whitelistedSender != _sender) revert SenderNotWhitelisted(_sender);
        _;
    }

    /// @dev Modifier that checks whether the msg.sender is owner
    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner");
        _;
    }

    constructor(address _router, uint64 _sourceChain, address _sender, address _migrator, address _owner)
        CCIPReceiver(_router)
    {
        whitelistedSourceChain = _sourceChain;
        whitelistedSender = _sender;
        migrator = _migrator;
        owner = _owner;
    }

    /// handle a received message
    function _ccipReceive(Client.Any2EVMMessage memory message)
        internal
        override
        onlyWhitelistedSourceChain(message.sourceChainSelector)
        onlyWhitelistedSenders(abi.decode(message.sender, (address)))
    {
        lastReceivedMessageId = message.messageId; // fetch the messageId
        // Expect one token to be transferred at once, but you can transfer several tokens.
        address token = message.destTokenAmounts[0].token;
        uint256 amount = message.destTokenAmounts[0].amount;
        lastReceivedTokenAddress = token;
        lastReceivedTokenAmount = amount;

        // Send received tokens to migrator contract
        IERC20(token).transfer(migrator, amount);

        emit RewardReceived(
            message.messageId,
            message.sourceChainSelector, // fetch the source chain identifier (aka selector)
            abi.decode(message.sender, (address)), // abi-decoding of the sender address,
            token,
            amount
        );
    }

    /* Admin */
    /// @notice Fallback function to allow the contract to receive Ether.
    /// @dev This function has no function body, making it a default function for receiving Ether.
    /// It is automatically called when Ether is transferred to the contract without any data.
    receive() external payable {}

    /// @notice Allows the owner to set a new contract owner.
    /// @param newOwner The address of the new contract owner.
    function setOwner(address newOwner) external onlyOwner {
        owner = newOwner;
    }

    /// @notice Allows the owner to set a new migrator contract.
    /// @param newMigrator The address of the new migrator contract.
    function setMigrator(address newMigrator) external onlyOwner {
        migrator = newMigrator;
    }

    /// @notice Emergency withdraw
    /// @param _token Address of token to withdraw
    function emergencyWithdraw(address _beneficiary, address _token, uint256 _amount) external onlyOwner {
        IERC20(_token).transfer(_beneficiary, _amount);
    }

    /// @notice Emergency withdraw native token
    /// @param _beneficiary Receiver of emergeny withdraw
    /// @param _amount Amount to withdraw
    function emergencyWithdrawNative(address _beneficiary, uint256 _amount) external onlyOwner {
        (bool sent,) = _beneficiary.call{value: _amount}("");
        require(sent, "Failed to send Ether");
    }
}

// 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);
}

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

// End consumer library.
library Client {
  struct EVMTokenAmount {
    address token; // token address on the local chain.
    uint256 amount; // Amount of tokens.
  }

  struct Any2EVMMessage {
    bytes32 messageId; // MessageId corresponding to ccipSend on source.
    uint64 sourceChainSelector; // Source chain selector.
    bytes sender; // abi.decode(sender) if coming from an EVM chain.
    bytes data; // payload sent in original message.
    EVMTokenAmount[] destTokenAmounts; // Tokens and their amounts in their destination chain representation.
  }

  // If extraArgs is empty bytes, the default is 200k gas limit and strict = false.
  struct EVM2AnyMessage {
    bytes receiver; // abi.encode(receiver address) for dest EVM chains
    bytes data; // Data payload
    EVMTokenAmount[] tokenAmounts; // Token transfers
    address feeToken; // Address of feeToken. address(0) means you will send msg.value.
    bytes extraArgs; // Populate this with _argsToBytes(EVMExtraArgsV1)
  }

  // extraArgs will evolve to support new features
  // bytes4(keccak256("CCIP EVMExtraArgsV1"));
  bytes4 public constant EVM_EXTRA_ARGS_V1_TAG = 0x97a657c9;
  struct EVMExtraArgsV1 {
    uint256 gasLimit; // ATTENTION!!! MAX GAS LIMIT 4M FOR BETA TESTING
    bool strict; // See strict sequencing details below.
  }

  function _argsToBytes(EVMExtraArgsV1 memory extraArgs) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(EVM_EXTRA_ARGS_V1_TAG, extraArgs);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {IAny2EVMMessageReceiver} from "IAny2EVMMessageReceiver.sol";

import {Client} from "Client.sol";

import {IERC165} from "IERC165.sol";

/// @title CCIPReceiver - Base contract for CCIP applications that can receive messages.
abstract contract CCIPReceiver is IAny2EVMMessageReceiver, IERC165 {
    address internal immutable i_router;

    constructor(address router) {
        if (router == address(0)) revert InvalidRouter(address(0));
        i_router = router;
    }

    /// @notice IERC165 supports an interfaceId
    /// @param interfaceId The interfaceId to check
    /// @return true if the interfaceId is supported
    function supportsInterface(bytes4 interfaceId) public pure override returns (bool) {
        return interfaceId == type(IAny2EVMMessageReceiver).interfaceId || interfaceId == type(IERC165).interfaceId;
    }

    /// @inheritdoc IAny2EVMMessageReceiver
    function ccipReceive(Client.Any2EVMMessage calldata message) external virtual override onlyRouter {
        _ccipReceive(message);
    }

    /// @notice Override this function in your implementation.
    /// @param message Any2EVMMessage
    function _ccipReceive(Client.Any2EVMMessage memory message) internal virtual;

    /////////////////////////////////////////////////////////////////////
    // Plumbing
    /////////////////////////////////////////////////////////////////////

    /// @notice Return the current router
    /// @return i_router address
    function getRouter() public view returns (address) {
        return address(i_router);
    }

    error InvalidRouter(address router);

    /// @dev only calls from the set router are accepted.
    modifier onlyRouter() {
        if (msg.sender != address(i_router)) revert InvalidRouter(msg.sender);
        _;
    }
}

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

import {Client} from "Client.sol";

/// @notice Application contracts that intend to receive messages from
/// the router should implement this interface.
interface IAny2EVMMessageReceiver {
  /// @notice Called by the Router to deliver a message.
  /// If this reverts, any token transfers also revert. The message
  /// will move to a FAILED state and become available for manual execution.
  /// @param message CCIP Message
  /// @dev Note ensure you check the msg.sender is the OffRampRouter
  function ccipReceive(Client.Any2EVMMessage calldata message) external;
}

// 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);
}

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

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0000000000000000000000003c3d92629a02a8d95d5cb9650fe49c3544f69b4300000000000000000000000000000000000000000000000045849994fc9c7b150000000000000000000000007ace867b3a503c6c76834ac223993fbd8963bed2000000000000000000000000f626acb046cc03ec45acff7f02792044cc225fe400000000000000000000000080d27bfb638f4fea1e862f1bd07dea577cb77d38

-----Decoded View---------------
Arg [0] : _router (address): 0x3C3D92629A02a8D95D5CB9650fe49C3544f69B43
Arg [1] : _sourceChain (uint64): 5009297550715157269
Arg [2] : _sender (address): 0x7ace867b3a503C6C76834ac223993FBD8963BED2
Arg [3] : _migrator (address): 0xF626AcB046CC03EC45aCff7F02792044Cc225fe4
Arg [4] : _owner (address): 0x80D27bfb638F4Fea1e862f1bd07DEa577CB77D38

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000003c3d92629a02a8d95d5cb9650fe49c3544f69b43
Arg [1] : 00000000000000000000000000000000000000000000000045849994fc9c7b15
Arg [2] : 0000000000000000000000007ace867b3a503c6c76834ac223993fbd8963bed2
Arg [3] : 000000000000000000000000f626acb046cc03ec45acff7f02792044cc225fe4
Arg [4] : 00000000000000000000000080d27bfb638f4fea1e862f1bd07dea577cb77d38