// File: @exoswap/contracts-utility/contracts/interfaces/IWETH.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;

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

interface IWETH is IERC20 {
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);

    function deposit() external payable;

    function withdraw(uint256) external;
}

// File: @openzeppelin/contracts/access/Ownable.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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.
 */
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].
     */
    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);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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);
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: contracts/interfaces/IBridgeToken.sol



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

interface IBridgeToken {
    function burn(address from, uint256 amount) external;

    function mint(address to, uint256 amount) external;

    function updateTokenInfo(
        string calldata _newName,
        string calldata _newSymbol,
        uint8 _newDecimals
    ) external;
}

// File: contracts/interfaces/IBridgeTokenManager.sol



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

import "../libraries/RToken.sol";

interface IBridgeTokenManager {
    event TokenAdded(address indexed addr, uint256 chainId);
    event TokenRemoved(address indexed addr, uint256 chainId);
    event LimitUpdated(address indexed addr, uint256 amt);

    function issue(
        RToken.Token calldata sourceToken,
        RToken.Token calldata targetToken
    ) external;

    function revoke(address targetAddr, uint256 targetChainId) external;

    function getLocal(
        address sourceAddr,
        uint256 sourceChainId,
        uint256 targetChainId
    ) external view returns (RToken.Token memory token);

    function setLimit(address tokenAddr, uint256 amt) external;

    function limits(address tokenAddr) external view returns (uint256);
}

// File: contracts/libraries/Errors.sol



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

/**
 * @title Errors library
 * @author Exoswap
 * @notice Defines the error messages emitted by the different contracts of bridge exoswap protocol
 * @dev Error messages prefix glossary:
 *  - B = Base errors
 *  - R = Relayer errors
 *  - M = Manager errors
 *  - BR = Router errors
 */
library Errors {
    //common errors
    string public constant B_ENTITY_EXIST = "1";
    string public constant B_ENTITY_NOT_EXIST = "2";
    string public constant B_LENGTH_MISMATCH = "3";
    string public constant B_INSUFFICIENT_BALANCE = "4";
    string public constant B_SEND_REVERT = "5";
    string public constant B_NOT_LISTED = "6";
    string public constant B_ZERO_ADDRESS = "7";
    string public constant B_EMPTY_BATCH = "8";
    string public constant B_ZERO_AMOUNT = "9";
    string public constant B_INVALID_EVENT = "10";
    string public constant B_EXPIRED = "11";
    string public constant B_AMOUNT_TOO_LOW = "12";
    string public constant B_GAS_OVERFLOW = "13";
    string public constant B_LOCKED = "14";
    string public constant B_PROTECTED_ADDRESS = "15";
    //relayer
    string public constant R_RESERVED_ENTITY = "R1";
    string public constant R_RESERVED_OWNER = "R2";
    string public constant R_NOT_APP_OWNER = "R3";
    string public constant R_ACQUIRE_FAILED = "R4";
    //manager
    string public constant M_ONLY_EXTERNAL = "M1";
    string public constant M_MAX_SIZE = "M2";
    string public constant M_SAME_CHAIN = "M3";
    string public constant M_SOURCE_EXIST = "M4";
    string public constant M_TARGET_EXIST = "M5";
    //router
    string public constant BR_WRONG_SOURCE_CHAIN = "BR1";
    string public constant BR_WRONG_TARGET_CHAIN = "BR2";
    string public constant BR_COMMITMENT_KNOWN = "BR3";
    string public constant BR_INVALID_SIGNATURES = "BR4";
    string public constant BR_AMOUNT_OVERFLOW = "BR5";
    string public constant BR_FEE_OVERFLOW = "BR6";
    string public constant BR_LIMIT_OVERFLOW = "BR7";
    string public constant BR_WRONG_EXECUTOR = "BR8";
    string public constant BR_FEE_TOO_LOW = "BR9";
    string public constant BR_EXECUTION_FAILED = "BR10";
}

// File: contracts/libraries/RToken.sol



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

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@exoswap/contracts-utility/contracts/interfaces/IWETH.sol";

import "../interfaces/IBridgeToken.sol";
import "./Errors.sol";

library RToken {
    using SafeERC20 for IERC20;

    enum IssueType {
        DEFAULT,
        MINTABLE
    }

    struct Token {
        address addr;
        uint256 chainId;
        IssueType issueType;
        bool isWETH9;
        bool exist;
    }

    function unsafeTransfer(address from, address to, uint256 amount) internal {
        require(from.balance >= amount, Errors.B_INSUFFICIENT_BALANCE);

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = to.call{value: amount}("");
        require(success, Errors.B_SEND_REVERT);
    }

    function enter(
        Token memory token,
        address from,
        address to,
        uint256 amount
    ) internal returns (Token memory) {
        require(token.exist, Errors.B_NOT_LISTED);
        if (token.issueType == IssueType.MINTABLE) {
            IBridgeToken(token.addr).burn(from, amount);
        } else if (token.issueType == IssueType.DEFAULT) {
            IERC20(token.addr).safeTransferFrom(from, to, amount);
            if (token.isWETH9) {
                IWETH(token.addr).deposit{value: amount}();
            }
        } else {
            assert(false);
        }
        return token;
    }

    function exit(
        Token memory token,
        address from,
        address to,
        uint256 amount
    ) internal returns (Token memory) {
        require(token.exist, Errors.B_NOT_LISTED);
        if (token.issueType == IssueType.MINTABLE) {
            IBridgeToken(token.addr).mint(to, amount);
        } else if (token.issueType == IssueType.DEFAULT) {
            if (token.isWETH9) {
                unsafeTransfer(from, to, amount);
            } else {
                IERC20(token.addr).safeTransfer(to, amount);
            }
        } else {
            assert(false);
        }
        return token;
    }
}

// File: contracts/managers/BridgeTokenManager.sol



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

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "../interfaces/IBridgeTokenManager.sol";
import "../libraries/Errors.sol";
import "../libraries/RToken.sol";

contract BridgeTokenManager is ERC165, Ownable, IBridgeTokenManager {
    uint256 private immutable _chainId;

    mapping(bytes32 => bytes32) private _keychain;
    mapping(bytes32 => RToken.Token) private _tokens;
    mapping(bytes32 => uint256) private _limits;

    constructor() {
        uint256 chainId_;
        assembly {
            chainId_ := chainid()
        }
        _chainId = chainId_;
    }

    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override returns (bool) {
        return
            interfaceId == type(IBridgeTokenManager).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev This should be responsible to set of a local token limit of entrance for the bridge to any direction
     * @param tokenAddr address of token
     * @param amt amount of the limit
     */
    function setLimit(
        address tokenAddr,
        uint256 amt
    ) external override onlyOwner {
        _limits[_createLimitKey(tokenAddr)] = amt;
        emit LimitUpdated(tokenAddr, amt);
    }

    function limits(
        address tokenAddr
    ) external view override returns (uint256) {
        return _limits[_createLimitKey(tokenAddr)];
    }

    /**
     * @dev This should be responsible to get token mapping for current chain
     * @param sourceAddr address of source token
     * @param sourceChainId chain id of token on origin
     * @param targetChainId chain id of token on target
     */
    function getLocal(
        address sourceAddr,
        uint256 sourceChainId,
        uint256 targetChainId
    ) public view override returns (RToken.Token memory token) {
        bytes32 tokenKey = _keychain[
            _createLinkKey(sourceAddr, sourceChainId, targetChainId)
        ];
        if (tokenKey == 0) {
            return token;
        }
        bytes32 sourceKey;
        if (_chainId != targetChainId) {
            sourceKey = tokenKey;
        } else {
            sourceKey = _keychain[tokenKey];
        }
        token = _tokens[sourceKey];
    }

    /**
     * @dev This should be responsible to remove tokens connection between chains
     * @param targetAddr address of target token
     * @param targetChainId chain id of target
     */
    function revoke(
        address targetAddr,
        uint256 targetChainId
    ) external override onlyOwner {
        bytes32 sourceKey = _keychain[
            _createLinkKey(targetAddr, targetChainId, _chainId)
        ];
        require(sourceKey != 0, Errors.B_ENTITY_NOT_EXIST);

        bytes32 targetKey = _keychain[sourceKey];
        require(targetKey != 0, Errors.B_ENTITY_NOT_EXIST);

        delete _keychain[sourceKey];
        delete _keychain[targetKey];

        RToken.Token memory sourceToken = _tokens[sourceKey];
        RToken.Token memory targetToken = _tokens[targetKey];

        delete _tokens[sourceKey];
        delete _tokens[targetKey];

        emit TokenRemoved(sourceToken.addr, sourceToken.chainId);
        emit TokenRemoved(targetToken.addr, targetToken.chainId);
    }

    /**
     * @dev This should be responsible to connect tokens between chains
     * @param sourceToken source token to create a link connection
     * @param targetToken target token to create a link connection
     */
    function issue(
        RToken.Token calldata sourceToken,
        RToken.Token calldata targetToken
    ) external override onlyOwner {
        require(sourceToken.chainId == _chainId, Errors.M_ONLY_EXTERNAL);
        require(targetToken.chainId != _chainId, Errors.M_SAME_CHAIN);
        require(sourceToken.exist, Errors.B_ENTITY_NOT_EXIST);
        require(targetToken.exist, Errors.B_ENTITY_NOT_EXIST);

        bytes32 sourceKey = _createLinkKey(
            targetToken.addr,
            targetToken.chainId,
            sourceToken.chainId
        );
        require(_keychain[sourceKey] == 0, Errors.M_SOURCE_EXIST);

        bytes32 targetKey = _createLinkKey(
            sourceToken.addr,
            sourceToken.chainId,
            targetToken.chainId
        );
        require(_keychain[targetKey] == 0, Errors.M_TARGET_EXIST);

        // linking
        _keychain[sourceKey] = targetKey;
        _keychain[targetKey] = sourceKey;
        _tokens[sourceKey] = sourceToken;
        _tokens[targetKey] = targetToken;

        emit TokenAdded(sourceToken.addr, sourceToken.chainId);
        emit TokenAdded(targetToken.addr, targetToken.chainId);
    }

    function _createLinkKey(
        address sourceAddr,
        uint256 sourceChainId,
        uint256 targetChainId
    ) private pure returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(sourceAddr, sourceChainId, targetChainId)
            );
    }

    function _createLimitKey(address addr) private view returns (bytes32) {
        return keccak256(abi.encodePacked(addr, _chainId));
    }
}