Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import {Client} from "../libraries/Client.sol";

interface IRouterClient {
  error UnsupportedDestinationChain(uint64 destChainSelector);
  error InsufficientFeeTokenAmount();
  error InvalidMsgValue();

  /// @notice Checks if the given chain ID is supported for sending/receiving.
  /// @param destChainSelector The chain to check.
  /// @return supported is true if it is supported, false if not.
  function isChainSupported(
    uint64 destChainSelector
  ) external view returns (bool supported);

  /// @param destinationChainSelector The destination chainSelector.
  /// @param message The cross-chain CCIP message including data and/or tokens.
  /// @return fee returns execution fee for the message.
  /// delivery to destination chain, denominated in the feeToken specified in the message.
  /// @dev Reverts with appropriate reason upon invalid message.
  function getFee(
    uint64 destinationChainSelector,
    Client.EVM2AnyMessage memory message
  ) external view returns (uint256 fee);

  /// @notice Request a message to be sent to the destination chain.
  /// @param destinationChainSelector The destination chain ID.
  /// @param message The cross-chain CCIP message including data and/or tokens.
  /// @return messageId The message ID.
  /// @dev Note if msg.value is larger than the required fee (from getFee) we accept.
  /// the overpayment with no refund.
  /// @dev Reverts with appropriate reason upon invalid message.
  function ccipSend(
    uint64 destinationChainSelector,
    Client.EVM2AnyMessage calldata message
  ) external payable returns (bytes32);
}

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

// End consumer library.
library Client {
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  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.
  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(EVMExtraArgsV2).
  }

  // Tag to indicate only a gas limit. Only usable for EVM as destination chain.
  bytes4 public constant EVM_EXTRA_ARGS_V1_TAG = 0x97a657c9;

  struct EVMExtraArgsV1 {
    uint256 gasLimit;
  }

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

  // Tag to indicate a gas limit (or dest chain equivalent processing units) and Out Of Order Execution. This tag is
  // available for multiple chain families. If there is no chain family specific tag, this is the default available
  // for a chain.
  // Note: not available for Solana VM based chains.
  bytes4 public constant GENERIC_EXTRA_ARGS_V2_TAG = 0x181dcf10;

  /// @param gasLimit: gas limit for the callback on the destination chain.
  /// @param allowOutOfOrderExecution: if true, it indicates that the message can be executed in any order relative to
  /// other messages from the same sender. This value's default varies by chain. On some chains, a particular value is
  /// enforced, meaning if the expected value is not set, the message request will revert.
  /// @dev Fully compatible with the previously existing EVMExtraArgsV2.
  struct GenericExtraArgsV2 {
    uint256 gasLimit;
    bool allowOutOfOrderExecution;
  }

  // Extra args tag for chains that use the Solana VM.
  bytes4 public constant SVM_EXTRA_ARGS_V1_TAG = 0x1f3b3aba;

  struct SVMExtraArgsV1 {
    uint32 computeUnits;
    uint64 accountIsWritableBitmap;
    bool allowOutOfOrderExecution;
    bytes32 tokenReceiver;
    // Additional accounts needed for execution of CCIP receiver. Must be empty if message.receiver is zero.
    // Token transfer related accounts are specified in the token pool lookup table on SVM.
    bytes32[] accounts;
  }

  /// @dev The maximum number of accounts that can be passed in SVMExtraArgs.
  uint256 public constant SVM_EXTRA_ARGS_MAX_ACCOUNTS = 64;

  /// @dev The expected static payload size of a token transfer when Borsh encoded and submitted to SVM.
  /// TokenPool extra data and offchain data sizes are dynamic, and should be accounted for separately.
  uint256 public constant SVM_TOKEN_TRANSFER_DATA_OVERHEAD = (4 + 32) // source_pool
    + 32 // token_address
    + 4 // gas_amount
    + 4 // extra_data overhead
    + 32 // amount
    + 32 // size of the token lookup table account
    + 32 // token-related accounts in the lookup table, over-estimated to 32, typically between 11 - 13
    + 32 // token account belonging to the token receiver, e.g ATA, not included in the token lookup table
    + 32 // per-chain token pool config, not included in the token lookup table
    + 32 // per-chain token billing config, not always included in the token lookup table
    + 32; // OffRamp pool signer PDA, not included in the token lookup table

  /// @dev Number of overhead accounts needed for message execution on SVM.
  /// @dev These are message.receiver, and the OffRamp Signer PDA specific to the receiver.
  uint256 public constant SVM_MESSAGING_ACCOUNTS_OVERHEAD = 2;

  /// @dev The size of each SVM account address in bytes.
  uint256 public constant SVM_ACCOUNT_BYTE_SIZE = 32;

  function _argsToBytes(
    GenericExtraArgsV2 memory extraArgs
  ) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(GENERIC_EXTRA_ARGS_V2_TAG, extraArgs);
  }

  function _svmArgsToBytes(
    SVMExtraArgsV1 memory extraArgs
  ) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(SVM_EXTRA_ARGS_V1_TAG, extraArgs);
  }
}

// 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 (last updated v4.9.4) (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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
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].
     *
     * CAUTION: See Security Considerations above.
     */
    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);
}

// 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
// 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));
    }
}

// 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);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.22;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IRouterClient} from "@chainlink/contracts-ccip/contracts/interfaces/IRouterClient.sol";
import {Client} from "@chainlink/contracts-ccip/contracts/libraries/Client.sol";
import "../interfaces/IERC677.sol";

/**
 * @title CCIP Curve Gauge Sender
 * @notice Sends LST rewards to a CCIP Curve Gauge Receiver on a destination chain
 */
contract CCIPCurveGaugeSender is Ownable {
    using SafeERC20 for IERC20;

    // address of LST
    IERC677 public lst;
    // address of wrapped LST
    IERC20 public wlst;

    // address of CCIP Router
    IRouterClient public router;
    // address of LINK token
    IERC20 public linkToken;

    // CCIP destination chain selector
    uint64 public destinationChainSelector;
    // address of CCIP Curve Gauge Receiver on destination chain
    address public ccipCurveGaugeReceiver;
    // extra args for CCIP message
    bytes public extraArgs;

    // address authorized to send rewards
    address public rewardsSender;

    event RewardsSent(bytes32 indexed messageId, uint256 amount, uint256 fees);

    error InsufficientFeeBalance(uint256 available, uint256 required);
    error NoRewards();
    error SenderNotAuthorized();

    /**
     * @notice Initializes the contract
     * @param _lst address of LST
     * @param _wlst address of wrapped LST
     * @param _router address of CCIP Router
     * @param _linkToken address of LINK token
     * @param _destinationChainSelector CCIP destination chain selector
     * @param _extraArgs extra args for CCIP message
     * @param _rewardsSender address authorized to send rewards
     */
    constructor(
        address _lst,
        address _wlst,
        address _router,
        address _linkToken,
        uint64 _destinationChainSelector,
        bytes memory _extraArgs,
        address _rewardsSender
    ) {
        lst = IERC677(_lst);
        wlst = IERC20(_wlst);
        router = IRouterClient(_router);
        linkToken = IERC20(_linkToken);
        destinationChainSelector = _destinationChainSelector;
        extraArgs = _extraArgs;
        rewardsSender = _rewardsSender;
        linkToken.approve(address(_router), type(uint256).max);
        IERC20(_wlst).approve(address(_router), type(uint256).max);
    }

    /**
     * @notice Reverts if the sender is not the rewards sender
     */
    modifier onlyRewardsSender() {
        if (msg.sender != rewardsSender) revert SenderNotAuthorized();
        _;
    }

    /**
     * @notice Receives transfers of LST rewards from staking pool
     */
    function onTokenTransfer(address, uint256, bytes calldata) external {}

    /**
     * @notice Sends LST rewards to a CCIP Curve Gauge Receiver on another chain
     * @return ID of the sent message
     */
    function sendRewards() external onlyRewardsSender returns (bytes32) {
        uint256 lstAmount = lst.balanceOf(address(this));
        if (lstAmount == 0) revert NoRewards();

        lst.transferAndCall(address(wlst), lstAmount, "");
        uint256 wlstAmount = IERC20(wlst).balanceOf(address(this));

        Client.EVM2AnyMessage memory evm2AnyMessage = _buildCCIPMessage(
            ccipCurveGaugeReceiver,
            address(wlst),
            wlstAmount,
            address(linkToken),
            extraArgs
        );

        uint256 fees = router.getFee(destinationChainSelector, evm2AnyMessage);
        if (fees > linkToken.balanceOf(address(this)))
            revert InsufficientFeeBalance(linkToken.balanceOf(address(this)), fees);

        bytes32 messageId = router.ccipSend(destinationChainSelector, evm2AnyMessage);

        emit RewardsSent(messageId, wlstAmount, fees);

        return messageId;
    }

    /**
     * @notice Returns the balance of LINK tokens in the contract
     * @return LINK token balance
     */
    function getFeeBalance() external view returns (uint256) {
        return linkToken.balanceOf(address(this));
    }

    /**
     * @notice Withdraws LINK tokens from the contract
     * @param _amount amount of LINK tokens to withdraw
     */
    function withdrawFees(uint256 _amount) external onlyOwner {
        linkToken.safeTransfer(msg.sender, _amount);
    }

    /**
     * @notice Sets the extra args for CCIP message
     * @param _extraArgs extra args for CCIP message
     */
    function setExtraArgs(bytes calldata _extraArgs) external onlyOwner {
        extraArgs = _extraArgs;
    }

    /**
     * @notice Sets the CCIP Curve Gauge Receiver
     * @param _ccipCurveGaugeReceiver address of CCIP Curve Gauge Receiver on destination chain
     */
    function setCCIPCurveGaugeReceiver(address _ccipCurveGaugeReceiver) external onlyOwner {
        ccipCurveGaugeReceiver = _ccipCurveGaugeReceiver;
    }

    /**
     * @notice Sets the address authorized to send rewards
     * @param _rewardsSender address authorized to send rewards
     */
    function setRewardsSender(address _rewardsSender) external onlyOwner {
        rewardsSender = _rewardsSender;
    }

    /**
     * @notice Builds a CCIP message
     * @param _receiver address of receiver on destination chain
     * @param _token address of token to send
     * @param _amount amount of tokens to send
     * @param _feeTokenAddress address of fee token
     * @param _extraArgs extra args for CCIP message
     */
    function _buildCCIPMessage(
        address _receiver,
        address _token,
        uint256 _amount,
        address _feeTokenAddress,
        bytes memory _extraArgs
    ) private pure returns (Client.EVM2AnyMessage memory) {
        Client.EVMTokenAmount[] memory tokenAmounts = new Client.EVMTokenAmount[](1);
        tokenAmounts[0] = Client.EVMTokenAmount({token: _token, amount: _amount});

        return
            Client.EVM2AnyMessage({
                receiver: abi.encode(_receiver),
                data: "",
                tokenAmounts: tokenAmounts,
                extraArgs: _extraArgs,
                feeToken: _feeTokenAddress
            });
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.22;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IERC677 is IERC20 {
    function transferAndCall(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external returns (bool success);
}