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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "@vialabs/contracts/message/MessageClient.sol";
import "@openzeppelin/contracts-4/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts-4/token/ERC20/utils/SafeERC20.sol";

interface IBurnableToken {
    function burn(uint256 amount) external;
    function totalSupply() external;
    function balanceOf(address account) external;
    function transfer(address recipient, uint256 amount) external;
    function allowance(address owner, address spender) external;
    function approve(address spender, uint256 amount) external;
    function transferFrom(address sender, address recipient, uint256 amount) external;
}

contract ERC20WarpToken is ERC20Burnable, MessageClient {
    IBurnableToken public immutable baseToken;
    uint256 public immutable homeChain;
    uint256 public immutable chainId;
    uint8 public immutable tokenDecimals;

    uint256 private _fee = 1 ether;
    bool private _canGoBack = false;
    address private _feeBeneficiary;

    event TokensReceived(address _eTo, uint256 _eAmount);
    event FeeChanged(uint256 _amount);
    event BeneficiaryChanged(address _beneficiary);
    event StatusChanged(bool _status);

    /**
     * On the "homeChain" the baseToken will be transferred to this contract and the equivalent amount of tokens will be minted on
     * the destination chain. On the destination chain the "new" ERC20 will be minted and transferred to the recipient. When bridging
     * back from a new chain to the home chain, the tokens will be burned on the destination chain and the equivalent amount will be
     * unlocked on the home chain from this contract. This acts as a "locker" for the tokens on the home chain.
     *
     * On each new non-home chain, the tokens will be burned on the source chain and minted on the destination chain (like helloerc20)
     *
     * @param _homeChain chain ID of the original ERC20 token
     * @param _baseToken address of the original ERC20 token (blank if not on the home chain)
     * @param _tokenName name of the ERC20 token on each additional chain (blank if on the home chain)
     * @param _tokenSymbol symbol of the ERC20 token on each additional chain (blank if on the home chain)
     * @param _tokenDecimals decimals of the ERC20 token on each additional chain
     */
    constructor(
        uint256 _homeChain,
        address _baseToken,
        string memory _tokenName,
        string memory _tokenSymbol,
        uint8 _tokenDecimals
    ) ERC20(_tokenName, _tokenSymbol) {
        baseToken = IBurnableToken(_baseToken);
        homeChain = _homeChain;
        chainId = block.chainid;
        tokenDecimals = _tokenDecimals;

        // @note Some sane initial value. But allow to change.
        _feeBeneficiary = MESSAGE_OWNER;
    }

    /**
     * Function to collect the accumulated fees in a much cheaper way compared to moving them on every tx. onlyMessageOwner can be omitted.
     *
     */
    function collect() external onlyMessageOwner {
        (bool sent, ) = payable(_feeBeneficiary).call{
            value: address(this).balance
        }("");
        require(sent, "Failed to send Ether");
    }

    /**
     * Function to set the fee
     *
     * @param _amount amount of desired fee
     */
    function setFee(uint256 _amount) external onlyMessageOwner {
        _fee = _amount;

        emit FeeChanged(_fee);
    }

    /**
     * Function to set the fee
     *
     * @param _beneficiary address that will receive the fees collected over time
     */
    function setBeneficiary(address _beneficiary) external onlyMessageOwner {
        _feeBeneficiary = _beneficiary;

        emit BeneficiaryChanged(_feeBeneficiary);
    }

    /**
     * Function to set if going back is allowed (for future use, as there will be no tokens locked, everything is burned)
     *
     * @param _status whether to allow going back or not
     */
    function setStatus(bool _status) external onlyMessageOwner {
        _canGoBack = _status;

        emit StatusChanged(_canGoBack);
    }

    /**
     * Bridge tokens from the current chain to the destination chain. If the current chain is the home chain, the tokens will be
     * transferred to this contract locked. If the current chain is not the home chain, the tokens will be burned on the current chain.
     * Function is "payable"
     *
     * After locking or burning, a cross chain message will be sent to the destination chain with the recipient and amount of tokens.
     *
     * @param _destChainId chain ID of the destination chain
     * @param _recipient address of the recipient on the destination chain
     * @param _amount amount of tokens to bridge
     */
    function bridge(
        uint256 _destChainId,
        address _recipient,
        uint256 _amount
    ) external payable onlyActiveChain(_destChainId) {
        require(msg.value == _fee, "Sent fee amount is incorrect");

        // @note needs this as onlyActiveChain() will have a valid chain because we need to receive messages from those chains in onlySelf(_sender, _sourceChainId)
        if (_destChainId == homeChain) {
            require(_canGoBack == true, "Going back is not allowed");
        }

        if (chainId == homeChain) {
            baseToken.transferFrom(msg.sender, address(this), _amount);
            // burn tokens if home chain
            baseToken.burn(_amount);
        } else {
            // burn tokens if "new" chain
            _burn(msg.sender, _amount);
        }

        // send cross chain message
        _sendMessage(_destChainId, abi.encode(_recipient, _amount));
    }

    function decimals() public view override returns (uint8) {
        return tokenDecimals;
    }

    /**
     * If the destination chain is the home chain, the tokens will be unlocked and transferred to the recipient. If the destination
     * chain is not the home chain, the tokens will be minted on the destination chain and transferred to the recipient.
     */
    function messageProcess(
        uint256,
        uint256 _sourceChainId,
        address _sender,
        address,
        uint256,
        bytes calldata _data
    ) external override onlySelf(_sender, _sourceChainId) {
        (address _recipient, uint256 _amount) = abi.decode(
            _data,
            (address, uint256)
        );

        if (chainId == homeChain) {
            // this won't trigger, do nothing
        } else {
            // mint tokens of "new" chain
            _mint(_recipient, _amount);
        }

        emit TokensReceived(_recipient, _amount);
    }

    /**
     * Function to read the fee
     *
     */
    function getFee() external view returns (uint256) {
        return _fee;
    }

    /**
     * Function to read the beneficiary
     *
     */
    function getBeneficiary() external view returns (address) {
        return _feeBeneficiary;
    }

    /**
     * Function to read the status
     *
     */
    function getStatus() external view returns (bool) {
        return _canGoBack;
    }
}

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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// 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: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]

pragma solidity ^0.8.9;

interface IERC20cl {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]

pragma solidity ^0.8.9;

interface IMessageV3 {
    event SendRequested(uint txId, address sender, address recipient, uint chain, bool express, bytes data, uint16 confirmations);
    event SendProcessed(uint txId, uint sourceChainId, address sender, address recipient);
    event Success(uint txId, uint sourceChainId, address sender, address recipient, uint amount);
    event ErrorLog(uint txId, string message);
    event SetExsig(address caller, address signer);
    event SetMaxgas(address caller, uint maxGas);
    event SetMaxfee(address caller, uint maxFee);

    function chainsig() external view returns (address signer);
    function weth() external view returns (address wethTokenAddress);
    function feeToken() external view returns (address feeToken);
    function feeTokenDecimals() external view returns (uint feeTokenDecimals);
    function minFee() external view returns (uint minFee);
    function bridgeEnabled() external view returns (bool bridgeEnabled);
    function takeFeesOffline() external view returns (bool takeFeesOffline);
    function whitelistOnly() external view returns (bool whitelistOnly);

    function enabledChains(uint destChainId) external view returns (bool enabled);
    function customSourceFee(address caller) external view returns (uint customSourceFee);
    function maxgas(address caller) external view returns (uint maxgas);
    function exsig(address caller) external view returns (address signer);

    // @dev backwards compat with BridgeClient
    function minTokenForChain(uint chainId) external returns (uint amount);

    function sendMessage(address recipient, uint chain, bytes calldata data, uint16 confirmations, bool express) external returns (uint txId);
    // @dev backwards compat with BridgeClient
    function sendRequest(address recipient, uint chainId, uint amount, address referrer, bytes calldata data, uint16 confirmations) external returns (uint txId);

    function setExsig(address signer) external;
    function setMaxgas(uint maxgas) external;
    function setMaxfee(uint maxfee) external;

    function getSourceFee(uint _destChainId, bool _express) external view returns (uint _fee);
}

// SPDX-License-Identifier: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]

pragma solidity ^0.8.9;

import "./IMessageV3.sol";
import "./IERC20cl.sol";

interface IFeature {
    function getPayload(uint _txId) external view returns (bytes memory);
}

interface IFeatureGateway {
    function isFeatureEnabled(uint32) external view returns (bool);
    function featureAddresses(uint32) external view returns (address);
    function messageV3() external view returns (IMessageV3);
    function processForward(uint _txId, uint _sourceChainId, uint _destChainId, address _sender, address _recipient, uint _gas, bytes[] calldata _data) external;
    function process(uint txId, uint sourceChainId, uint destChainId, address sender, address recipient, uint gas, uint32 featureId, bytes calldata featureReply, bytes[] calldata data) external;
}

/**
 * @title MessageV3 Client
 * @author Atlas <[email protected]>
 */
abstract contract MessageClient {
    IMessageV3 public MESSAGEv3;
    IERC20cl public FEE_TOKEN;
    IFeatureGateway public FEATURE_GATEWAY;
    mapping(uint => mapping(uint32 => ChainData)) public FEATURES;

    struct ChainData {
        address endpoint; // address of this contract on specified chain
        bytes endpointExtended; // address of this contract on non EVM
        uint16 confirmations; // source confirmations
        bool extended; // are we using extended endpoint? (addresses larger than uint256)
    }
    mapping(uint => ChainData) public CHAINS;
    address public MESSAGE_OWNER;

    modifier onlySelf(address _sender, uint _sourceChainId) {
        require(msg.sender == address(MESSAGEv3), "MessageClient: not authorized");
        require(_sender == CHAINS[_sourceChainId].endpoint, "MessageClient: not authorized");
        _;
    }

    modifier onlyActiveChain(uint _destinationChainId) {
        require(CHAINS[_destinationChainId].endpoint != address(0), "MessageClient: destination chain not active");
        _;
    }

    modifier onlyMessageOwner() {
        require(msg.sender == MESSAGE_OWNER, "MessageClient: not authorized");
        _;
    }

    event MessageOwnershipTransferred(address previousOwner, address newOwner);
    event RecoverToken(address owner, address token, uint amount);
    event SetMaxgas(address owner, uint maxGas);
    event SetMaxfee(address owner, uint maxfee);
    event SetExsig(address owner, address exsig);
    event SendMessageWithFeature(uint txId, uint destinationChainId, uint32 featureId, bytes featureData);

    constructor() {
        MESSAGE_OWNER = msg.sender;
    }

    function transferMessageOwnership(address _newMessageOwner) external onlyMessageOwner {
        MESSAGE_OWNER = _newMessageOwner;
        emit MessageOwnershipTransferred(msg.sender, _newMessageOwner);
    }

    /** BRIDGE RECEIVER */
    // @dev DEPRICATED kept for backwards compatibility
    function messageProcess(
        uint _txId,          // transaction id
        uint _sourceChainId, // source chain id
        address _sender,     // corresponding MessageClient address on source chain
        address,
        uint,
        bytes calldata _data // encoded message from source chain
    ) external virtual onlySelf (_sender, _sourceChainId) {
        _processMessage(_txId, _sourceChainId, _data);
    }

    // @dev PREFERRED if no Features used
    // this is extended by the implementing class if not using Features
    function _processMessage(uint _txId, uint _sourceChainId, bytes calldata _data) internal virtual {
        (uint32 _featureId, bytes memory _featureData, bytes memory _messageData) = abi.decode(_data, (uint32, bytes, bytes));
        
        // call the implementing class to process the message
        _processMessageWithFeature(_txId, _sourceChainId, _messageData, _featureId, _featureData, _getFeatureResponse(_featureId, _txId));
    }

    // @dev REQUIRED if using Features
    // this is extended by the implementing class if using Features
    function _processMessageWithFeature(
        uint,         // transaction id
        uint,         // source chain id
        bytes memory, // encoded message from source chain
        uint32,       // feature id
        bytes memory, // encoded feature data
        bytes memory  // reply from feature processing off-chain
    ) internal virtual {
        revert("MessageClient: _processMessage or _processMessageWithFeature not implemented");
    }

    function _getFeatureResponse(uint32 _featureId, uint _txId) internal view returns (bytes memory) {
        return IFeature(FEATURE_GATEWAY.featureAddresses(_featureId)).getPayload(_txId);
    }
    
    /** BRIDGE SENDER */
    function _sendMessage(uint _destinationChainId, bytes memory _data) internal returns (uint _txId) {
        ChainData memory _chain = CHAINS[_destinationChainId];
        if(_chain.extended) { // non-evm addresses larger than uint256
            _data = abi.encode(_data, _chain.endpointExtended);
        }
        return IMessageV3(MESSAGEv3).sendMessage(
            _chain.endpoint,      // corresponding MessageClient contract address on destination chain
            _destinationChainId,  // id of the destination chain
            _data,                // arbitrary data package to send
            _chain.confirmations, // amount of required transaction confirmations
            false                 // send express mode on destination
        );
    }

    function _sendMessageExpress(uint _destinationChainId, bytes memory _data) internal returns (uint _txId) {
        ChainData memory _chain = CHAINS[_destinationChainId];
        if(_chain.extended) { // non-evm addresses larger than uint256
            _data = abi.encode(_data, _chain.endpointExtended);
        }
        return IMessageV3(MESSAGEv3).sendMessage(
            _chain.endpoint,      // corresponding MessageV3Client contract address on destination chain
            _destinationChainId,  // id of the destination chain
            _data,                // arbitrary data package to send
            _chain.confirmations, // amount of required transaction confirmations
            true                  // send express mode on destination
        );
    }

    function _sendMessageWithFeature(uint _destinationChainId, bytes memory _messageData, uint32 _featureId, bytes memory _featureData) internal returns (uint _txId) {
        require(FEATURE_GATEWAY.isFeatureEnabled(_featureId), "MessageClient: feature not enabled");

        // wrap feature data into message data so it can be signed
        bytes memory _data = abi.encode(_featureId, _featureData, _messageData);

        ChainData memory _chain = CHAINS[_destinationChainId];
        if(_chain.extended) { // non-evm addresses larger than uint256
            _data = abi.encode(_data, _chain.endpointExtended);
        }

        _txId = IMessageV3(MESSAGEv3).sendMessage(
            _chain.endpoint,      // corresponding MessageV3Client contract address on destination chain
            _destinationChainId,  // id of the destination chain
            _data,                // arbitrary data package to send
            _chain.confirmations, // amount of required transaction confirmations
            false                 // send express mode on destination
        );

        // signal we have feature data included with the message data
        emit SendMessageWithFeature(_txId, _destinationChainId, _featureId, _featureData);
    }

    /** OWNER */
    function configureClientExtended(
        address _messageV3, // MessageV3 bridge address
        uint[] calldata _chains, // list of chains to accept as valid destinations
        bytes[] calldata _endpoints, // list of corresponding MessageV3Client addresses on each chain
        uint16[] calldata _confirmations // confirmations required on each chain before processing
    ) external onlyMessageOwner {
        uint _chainsLength = _chains.length;
        for(uint x=0; x < _chainsLength; x++) {
            CHAINS[_chains[x]].confirmations = _confirmations[x];
            CHAINS[_chains[x]].endpointExtended = _endpoints[x];
            CHAINS[_chains[x]].extended = true;
            CHAINS[_chains[x]].endpoint = address(1);
        }

        _configureMessageV3(_messageV3);
    }

    function configureClient(
        address _messageV3, // MessageV3 bridge address
        uint[] calldata _chains, // list of chains to accept as valid destinations
        address[] calldata _endpoints, // list of corresponding MessageV3Client addresses on each chain
        uint16[] calldata _confirmations // confirmations required on each chain before processing
    ) public onlyMessageOwner {
        uint _chainsLength = _chains.length;
        for(uint x=0; x < _chainsLength; x++) {
            CHAINS[_chains[x]].confirmations = _confirmations[x];
            CHAINS[_chains[x]].endpoint = _endpoints[x];
            CHAINS[_chains[x]].extended = false;
        }

        _configureMessageV3(_messageV3);
    }

    function configureFeatureGateway(address _featureGateway) external onlyMessageOwner {
        FEATURE_GATEWAY = IFeatureGateway(_featureGateway);
    }

    function _configureMessageV3(address _messageV3) internal {
        MESSAGEv3 = IMessageV3(_messageV3);
        FEE_TOKEN = IERC20cl(MESSAGEv3.feeToken());

        // approve bridge for source chain fees (limited per transaction with setMaxfee)
        if(address(FEE_TOKEN) != address(0)) {
            FEE_TOKEN.approve(address(MESSAGEv3), type(uint).max);
        }

        // approve bridge for destination gas fees (limited per transaction with setMaxgas)
        if(address(MESSAGEv3.weth()) != address(0)) {
            IERC20cl(MESSAGEv3.weth()).approve(address(MESSAGEv3), type(uint).max);
        }
    }

    function setExsig(address _signer) public onlyMessageOwner {
        MESSAGEv3.setExsig(_signer);
        emit SetExsig(msg.sender, _signer);
    }

    function setMaxgas(uint _maxGas) public onlyMessageOwner {
        MESSAGEv3.setMaxgas(_maxGas);
        emit SetMaxgas(msg.sender, _maxGas);
    }

    function setMaxfee(uint _maxFee) public onlyMessageOwner {
        MESSAGEv3.setMaxfee(_maxFee);
        emit SetMaxfee(msg.sender, _maxFee);
    }

    function recoverToken(address _token, uint _amount) public onlyMessageOwner {
        if(_token == address(0)) {
            // payable(msg.sender).transfer(_amount);
            // @note Zk needs
            (bool success, ) = payable(msg.sender).call{value: _amount}("");
            require(success, "Transfer failed");
        } else {
            IERC20cl(_token).transfer(msg.sender, _amount);
        }
        emit RecoverToken(msg.sender, _token, _amount);
    }

    function isSelf(address _sender, uint _sourceChainId) public view returns (bool) {
        if(_sender == CHAINS[_sourceChainId].endpoint) return true;
        return false;
    }

    function isAuthorized(address _sender, uint _sourceChainId) public view returns (bool) {
        return isSelf(_sender, _sourceChainId);
    }

    receive() external payable {}
    fallback() external payable {}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IFeatureGateway","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FEE_TOKEN","outputs":[{"internalType":"contract IERC20cl","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MESSAGE_OWNER","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MESSAGEv3","outputs":[{"internalType":"contract IMessageV3","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseToken","outputs":[{"internalType":"contract IBurnableToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_destChainId","type":"uint256"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"bridge","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"chainId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"collect","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_messageV3","type":"address"},{"internalType":"uint256[]","name":"_chains","type":"uint256[]"},{"internalType":"address[]","name":"_endpoints","type":"address[]"},{"internalType":"uint16[]","name":"_confirmations","type":"uint16[]"}],"name":"configureClient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_messageV3","type":"address"},{"internalType":"uint256[]","name":"_chains","type":"uint256[]"},{"internalType":"bytes[]","name":"_endpoints","type":"bytes[]"},{"internalType":"uint16[]","name":"_confirmations","type":"uint16[]"}],"name":"configureClientExtended","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_featureGateway","type":"address"}],"name":"configureFeatureGateway","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getBeneficiary","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getStatus","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"homeChain","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_sender","type":"address"},{"internalType":"uint256","name":"_sourceChainId","type":"uint256"}],"name":"isAuthorized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_sender","type":"address"},{"internalType":"uint256","name":"_sourceChainId","type":"uint256"}],"name":"isSelf","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"_sourceChainId","type":"uint256"},{"internalType":"address","name":"_sender","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"messageProcess","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"recoverToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_beneficiary","type":"address"}],"name":"setBeneficiary","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"}],"name":"setExsig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"setFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxFee","type":"uint256"}],"name":"setMaxfee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxGas","type":"uint256"}],"name":"setMaxgas","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_status","type":"bool"}],"name":"setStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenDecimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newMessageOwner","type":"address"}],"name":"transferMessageOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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-----Decoded View---------------
Arg [0] : _homeChain (uint256): 137
Arg [1] : _baseToken (address): 0x874e178A2f3f3F9d34db862453Cd756E7eAb0381
Arg [2] : _tokenName (string): Gravity Finance
Arg [3] : _tokenSymbol (string): GFI
Arg [4] : _tokenDecimals (uint8): 18

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000089
Arg [1] : 000000000000000000000000874e178a2f3f3f9d34db862453cd756e7eab0381
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [5] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [6] : 477261766974792046696e616e63650000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [8] : 4746490000000000000000000000000000000000000000000000000000000000