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// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {IL1ERC20Bridge} from "./interfaces/IL1ERC20Bridge.sol";
import {IL2ERC20Bridge} from "./interfaces/IL2ERC20Bridge.sol";
import {IERC20Bridged} from "../token/ERC20Bridged.sol";
import {ITokenRateUpdatable} from "../optimism/interfaces/ITokenRateUpdatable.sol";
import {ERC20RebasableBridged} from "../token/ERC20RebasableBridged.sol";
import {BridgingManager} from "../BridgingManager.sol";
import {RebasableAndNonRebasableTokens} from "./RebasableAndNonRebasableTokens.sol";
import {CrossDomainEnabled} from "./CrossDomainEnabled.sol";
import {DepositDataCodec} from "../lib/DepositDataCodec.sol";
import {Versioned} from "../utils/Versioned.sol";

/// @author psirex, kovalgek
/// @notice The L2 token bridge works with the L1 token bridge to enable ERC20 token bridging
///     between L1 and L2. It acts as a minter for new tokens when it hears about
///     deposits into the L1 token bridge. It also acts as a burner of the tokens
///     intended for withdrawal, informing the L1 bridge to release L1 funds. Additionally, adds
///     the methods for bridging management: enabling and disabling withdrawals/deposits
contract L2ERC20ExtendedTokensBridge is
    IL2ERC20Bridge,
    BridgingManager,
    RebasableAndNonRebasableTokens,
    CrossDomainEnabled,
    Versioned
{
    using SafeERC20 for IERC20;

    address private immutable L1_TOKEN_BRIDGE;

    /// @param messenger_ L2 messenger address being used for cross-chain communications
    /// @param l1TokenBridge_  Address of the corresponding L1 bridge
    /// @param l1TokenNonRebasable_ Address of the bridged token in the L1 chain
    /// @param l1TokenRebasable_ Address of the bridged token in the L1 chain
    /// @param l2TokenNonRebasable_ Address of the token minted on the L2 chain when token bridged
    /// @param l2TokenRebasable_ Address of the token minted on the L2 chain when token bridged
    constructor(
        address messenger_,
        address l1TokenBridge_,
        address l1TokenNonRebasable_,
        address l1TokenRebasable_,
        address l2TokenNonRebasable_,
        address l2TokenRebasable_
    ) CrossDomainEnabled(messenger_) RebasableAndNonRebasableTokens (
        l1TokenNonRebasable_,
        l1TokenRebasable_,
        l2TokenNonRebasable_,
        l2TokenRebasable_
    ) {
        if (l1TokenBridge_ == address(0)) {
            revert ErrorZeroAddressL1Bridge();
        }
        L1_TOKEN_BRIDGE = l1TokenBridge_;
    }

    /// @notice Initializes the contract from scratch.
    /// @param admin_ Address of the account to grant the DEFAULT_ADMIN_ROLE
    function initialize(address admin_) external {
        _initializeExtendedTokensBridge();
        _initializeBridgingManager(admin_);
    }

    /// @notice A function to finalize upgrade to v2 (from v1).
    function finalizeUpgrade_v2() external {
        if (!_isBridgingManagerInitialized()) {
            revert ErrorBridgingManagerIsNotInitialized();
        }
        _initializeExtendedTokensBridge();
    }

    /// @inheritdoc IL2ERC20Bridge
    function l1TokenBridge() external view returns (address) {
        return L1_TOKEN_BRIDGE;
    }

    /// @inheritdoc IL2ERC20Bridge
    function withdraw(
        address l2Token_,
        uint256 amount_,
        uint32 l1Gas_,
        bytes calldata data_
    ) external
        whenWithdrawalsEnabled
        onlySupportedL2Token(l2Token_)
    {
        if (Address.isContract(msg.sender)) {
            revert ErrorSenderNotEOA();
        }
        _withdrawTo(l2Token_, msg.sender, msg.sender, amount_, l1Gas_, data_);
        emit WithdrawalInitiated(_getL1Token(l2Token_), l2Token_, msg.sender, msg.sender, amount_, data_);
    }

    /// @inheritdoc IL2ERC20Bridge
    function withdrawTo(
        address l2Token_,
        address to_,
        uint256 amount_,
        uint32 l1Gas_,
        bytes calldata data_
    ) external
        whenWithdrawalsEnabled
        onlyNonZeroAccount(to_)
        onlySupportedL2Token(l2Token_)
    {
        _withdrawTo(l2Token_, msg.sender, to_, amount_, l1Gas_, data_);
        emit WithdrawalInitiated(_getL1Token(l2Token_), l2Token_, msg.sender, to_, amount_, data_);
    }

    /// @inheritdoc IL2ERC20Bridge
    function finalizeDeposit(
        address l1Token_,
        address l2Token_,
        address from_,
        address to_,
        uint256 amount_,
        bytes calldata data_
    )
        external
        whenDepositsEnabled
        onlyFromCrossDomainAccount(L1_TOKEN_BRIDGE)
        onlySupportedL1L2TokensPair(l1Token_, l2Token_)
    {
        DepositDataCodec.DepositData memory depositData = DepositDataCodec.decodeDepositData(data_);
        ITokenRateUpdatable tokenRateOracle = ERC20RebasableBridged(L2_TOKEN_REBASABLE).TOKEN_RATE_ORACLE();
        tokenRateOracle.updateRate(depositData.rate, depositData.timestamp);

        uint256 depositedL2TokenAmount = _mintTokens(l2Token_, to_, amount_);
        emit DepositFinalized(l1Token_, l2Token_, from_, to_, depositedL2TokenAmount, depositData.data);
    }

    function _initializeExtendedTokensBridge() internal {
        _initializeContractVersionTo(2);
        // used for `bridgeWrap` call to succeed in the `_mintTokens` method
        IERC20(L2_TOKEN_NON_REBASABLE).safeIncreaseAllowance(L2_TOKEN_REBASABLE, type(uint256).max);
    }

    /// @notice Performs the logic for withdrawals by burning the token and informing
    ///         the L1 token Gateway of the withdrawal. This function does not allow sending to token addresses.
    ///         L1_TOKEN_REBASABLE does not allow transfers to itself. Additionally, sending funds to
    ///         L1_TOKEN_NON_REBASABLE would lock these funds permanently, as it is non-upgradeable.
    /// @param l2Token_ Address of L2 token where withdrawal was initiated.
    /// @param from_ Account to pull the withdrawal from on L2
    /// @param to_ Account to give the withdrawal to on L1.
    /// @param amount_ Amount of the token to withdraw
    /// @param l1Gas_ Minimum gas limit to use for the transaction.
    /// @param data_ Optional data to forward to L1. This data is provided
    ///        solely as a convenience for external contracts. Aside from enforcing a maximum
    ///        length, these contracts provide no guarantees about its content
    function _withdrawTo(
        address l2Token_,
        address from_,
        address to_,
        uint256 amount_,
        uint32 l1Gas_,
        bytes calldata data_
    ) internal {
        if (to_ == L1_TOKEN_REBASABLE || to_ == L1_TOKEN_NON_REBASABLE) {
            revert ErrorTransferToL1TokenContract();
        }

        uint256 nonRebasableAmountToWithdraw = _burnTokens(l2Token_, from_, amount_);

        bytes memory message = abi.encodeWithSelector(
            IL1ERC20Bridge.finalizeERC20Withdrawal.selector,
            _getL1Token(l2Token_), l2Token_, from_, to_, nonRebasableAmountToWithdraw, data_
        );
        sendCrossDomainMessage(L1_TOKEN_BRIDGE, l1Gas_, message);
    }

    /// @notice Mints tokens, wraps if needed and returns amount of minted tokens.
    /// @param l2Token_ Address of L2 token for which deposit is finalizing.
    /// @param to_ Account that token mints for.
    /// @param nonRebasableTokenAmount_ Amount of non-rebasable token.
    /// @return returns amount of minted tokens.
    function _mintTokens(
        address l2Token_,
        address to_,
        uint256 nonRebasableTokenAmount_
    ) internal returns (uint256) {
        if (nonRebasableTokenAmount_ == 0) {
            return 0;
        }
        if (l2Token_ == L2_TOKEN_REBASABLE) {
            IERC20Bridged(L2_TOKEN_NON_REBASABLE).bridgeMint(address(this), nonRebasableTokenAmount_);
            return ERC20RebasableBridged(l2Token_).bridgeWrap(to_, nonRebasableTokenAmount_);
        }
        IERC20Bridged(l2Token_).bridgeMint(to_, nonRebasableTokenAmount_);
        return nonRebasableTokenAmount_;
    }

    /// @notice Unwraps if needed, burns tokens and returns amount of non-rebasable token to withdraw.
    /// @param l2Token_ Address of L2 token where withdrawal was initiated.
    /// @param from_ Account which tokens are burns.
    /// @param amount_ Amount of token to burn.
    /// @return returns amount of non-rebasable token to withdraw.
    function _burnTokens(
        address l2Token_,
        address from_,
        uint256 amount_
    ) internal returns (uint256) {
        if (amount_ == 0) {
            return 0;
        }
        uint256 nonRebasableTokenAmount = amount_;
        if (l2Token_ == L2_TOKEN_REBASABLE) {
            nonRebasableTokenAmount = ERC20RebasableBridged(L2_TOKEN_REBASABLE).getSharesByTokens(amount_);
            if (nonRebasableTokenAmount != 0) {
                ERC20RebasableBridged(L2_TOKEN_REBASABLE).bridgeUnwrap(from_, amount_);
                IERC20Bridged(L2_TOKEN_NON_REBASABLE).bridgeBurn(from_, nonRebasableTokenAmount);
            }
            return nonRebasableTokenAmount;
        }
        IERC20Bridged(L2_TOKEN_NON_REBASABLE).bridgeBurn(from_, nonRebasableTokenAmount);
        return nonRebasableTokenAmount;
    }

    error ErrorSenderNotEOA();
    error ErrorZeroAddressL1Bridge();
    error ErrorTransferToL1TokenContract();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

    /**
     * @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");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// 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;
    }
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";

/// @author psirex, kovalgek
/// @notice Contains administrative methods to retrieve and control the state of the bridging
contract BridgingManager is AccessControl {
    /// @dev Stores the state of the bridging
    /// @param isInitialized Shows whether the contract is initialized or not
    /// @param isDepositsEnabled Stores the state of the deposits
    /// @param isWithdrawalsEnabled Stores the state of the withdrawals
    struct State {
        /// @dev This variable is used to determine whether the contract has been initialized or not.
        /// At the same time, bridges have their own code for initialization and storage versioning.
        /// Therefore, it is recommended to base upgrade logic on new mechanisms since v2.
        bool isInitialized;
        bool isDepositsEnabled;
        bool isWithdrawalsEnabled;
    }

    bytes32 public constant DEPOSITS_ENABLER_ROLE =
        keccak256("BridgingManager.DEPOSITS_ENABLER_ROLE");
    bytes32 public constant DEPOSITS_DISABLER_ROLE =
        keccak256("BridgingManager.DEPOSITS_DISABLER_ROLE");
    bytes32 public constant WITHDRAWALS_ENABLER_ROLE =
        keccak256("BridgingManager.WITHDRAWALS_ENABLER_ROLE");
    bytes32 public constant WITHDRAWALS_DISABLER_ROLE =
        keccak256("BridgingManager.WITHDRAWALS_DISABLER_ROLE");

    /// @dev The location of the slot with State
    bytes32 private constant STATE_SLOT =
        keccak256("BridgingManager.bridgingState");

    /// @notice Initializes the contract to grant DEFAULT_ADMIN_ROLE to the admin_ address
    /// @dev This method might be called only once
    /// @param admin_ Address of the account to grant the DEFAULT_ADMIN_ROLE
    function _initializeBridgingManager(address admin_) internal {
        if (admin_ == address(0)) {
            revert ErrorZeroAddressAdmin();
        }
        State storage s = _loadState();
        if (s.isInitialized) {
            revert ErrorAlreadyInitialized();
        }
        _grantRole(DEFAULT_ADMIN_ROLE, admin_);
        s.isInitialized = true;
        emit Initialized(admin_);
    }

    /// @notice Returns whether the contract is initialized or not
    function isInitialized() public view returns (bool) {
        return _loadState().isInitialized;
    }

    /// @notice Returns whether the deposits are enabled or not
    function isDepositsEnabled() public view returns (bool) {
        return _loadState().isDepositsEnabled;
    }

    /// @notice Returns whether the withdrawals are enabled or not
    function isWithdrawalsEnabled() public view returns (bool) {
        return _loadState().isWithdrawalsEnabled;
    }

    /// @notice Enables the deposits if they are disabled
    function enableDeposits() external onlyRole(DEPOSITS_ENABLER_ROLE) {
        if (isDepositsEnabled()) {
            revert ErrorDepositsEnabled();
        }
        _loadState().isDepositsEnabled = true;
        emit DepositsEnabled(msg.sender);
    }

    /// @notice Disables the deposits if they aren't disabled yet
    function disableDeposits()
        external
        whenDepositsEnabled
        onlyRole(DEPOSITS_DISABLER_ROLE)
    {
        _loadState().isDepositsEnabled = false;
        emit DepositsDisabled(msg.sender);
    }

    /// @notice Enables the withdrawals if they are disabled
    function enableWithdrawals() external onlyRole(WITHDRAWALS_ENABLER_ROLE) {
        if (isWithdrawalsEnabled()) {
            revert ErrorWithdrawalsEnabled();
        }
        _loadState().isWithdrawalsEnabled = true;
        emit WithdrawalsEnabled(msg.sender);
    }

    /// @notice Disables the withdrawals if they aren't disabled yet
    function disableWithdrawals()
        external
        whenWithdrawalsEnabled
        onlyRole(WITHDRAWALS_DISABLER_ROLE)
    {
        _loadState().isWithdrawalsEnabled = false;
        emit WithdrawalsDisabled(msg.sender);
    }

    function _isBridgingManagerInitialized() internal view returns (bool) {
        State storage s = _loadState();
        return s.isInitialized;
    }

    /// @dev Returns the reference to the slot with State struct
    function _loadState() private pure returns (State storage r) {
        bytes32 slot = STATE_SLOT;
        assembly {
            r.slot := slot
        }
    }

    /// @dev Validates that deposits are enabled
    modifier whenDepositsEnabled() {
        if (!isDepositsEnabled()) {
            revert ErrorDepositsDisabled();
        }
        _;
    }

    /// @dev Validates that withdrawals are enabled
    modifier whenWithdrawalsEnabled() {
        if (!isWithdrawalsEnabled()) {
            revert ErrorWithdrawalsDisabled();
        }
        _;
    }

    event DepositsEnabled(address indexed enabler);
    event DepositsDisabled(address indexed disabler);
    event WithdrawalsEnabled(address indexed enabler);
    event WithdrawalsDisabled(address indexed disabler);
    event Initialized(address indexed admin);

    error ErrorZeroAddressAdmin();
    error ErrorDepositsEnabled();
    error ErrorDepositsDisabled();
    error ErrorWithdrawalsEnabled();
    error ErrorWithdrawalsDisabled();
    error ErrorAlreadyInitialized();
    error ErrorBridgingManagerIsNotInitialized();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author kovalgek
/// @notice encodes and decodes DepositData for crosschain transfering.
library DepositDataCodec {

    uint8 internal constant RATE_FIELD_SIZE = 16;
    uint8 internal constant TIMESTAMP_FIELD_SIZE = 5;

    struct DepositData {
        uint128 rate;
        uint40 timestamp;
        bytes data;
    }

    function encodeDepositData(DepositData memory depositData) internal pure returns (bytes memory) {
        bytes memory data = bytes.concat(
            abi.encodePacked(depositData.rate),
            abi.encodePacked(depositData.timestamp),
            abi.encodePacked(depositData.data)
        );
        return data;
    }

    function decodeDepositData(bytes calldata buffer) internal pure returns (DepositData memory) {
        if (buffer.length < RATE_FIELD_SIZE + TIMESTAMP_FIELD_SIZE) {
            revert ErrorDepositDataLength();
        }

        DepositData memory depositData = DepositData({
            rate: uint128(bytes16(buffer[0:RATE_FIELD_SIZE])),
            timestamp: uint40(bytes5(buffer[RATE_FIELD_SIZE:RATE_FIELD_SIZE + TIMESTAMP_FIELD_SIZE])),
            data: buffer[RATE_FIELD_SIZE + TIMESTAMP_FIELD_SIZE:]
        });

        return depositData;
    }

    error ErrorDepositDataLength();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @dev A copy of UnstructuredRefStorage.sol library from Lido on Ethereum protocol.
///      https://github.com/lidofinance/lido-dao/blob/master/contracts/0.8.9/lib/UnstructuredRefStorage.sol
library UnstructuredRefStorage {
    function storageMapAddressMapAddressUint256(bytes32 _position) internal pure returns (
        mapping(address => mapping(address => uint256)) storage result
    ) {
        assembly { result.slot := _position }
    }

    function storageMapAddressAddressUint256(bytes32 _position) internal pure returns (
        mapping(address => uint256) storage result
    ) {
        assembly { result.slot := _position }
    }
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @dev A copy of UnstructuredStorage.sol library from Lido on Ethereum protocol.
///      https://github.com/lidofinance/lido-dao/blob/master/contracts/0.8.9/lib/UnstructuredStorage.sol
library UnstructuredStorage {
    function getStorageBool(bytes32 position) internal view returns (bool data) {
        assembly { data := sload(position) }
    }

    function getStorageUint256(bytes32 position) internal view returns (uint256 data) {
        assembly { data := sload(position) }
    }

    function setStorageBool(bytes32 position, bool data) internal {
        assembly { sstore(position, data) }
    }

    function setStorageUint256(bytes32 position, uint256 data) internal {
        assembly { sstore(position, data) }
    }
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

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

/// @dev Helper contract for contracts performing cross-domain communications
contract CrossDomainEnabled {
    /// @notice Messenger contract used to send and receive messages from the other domain
    ICrossDomainMessenger public immutable MESSENGER;

    /// @param messenger_ Address of the CrossDomainMessenger on the current layer
    constructor(address messenger_) {
        if (messenger_ == address(0)) {
            revert ErrorZeroAddressMessenger();
        }
        MESSENGER = ICrossDomainMessenger(messenger_);
    }

    /// @dev Sends a message to an account on another domain
    /// @param crossDomainTarget_ Intended recipient on the destination domain
    /// @param message_ Data to send to the target (usually calldata to a function with
    ///     `onlyFromCrossDomainAccount()`)
    /// @param gasLimit_ gasLimit for the receipt of the message on the target domain.
    function sendCrossDomainMessage(
        address crossDomainTarget_,
        uint32 gasLimit_,
        bytes memory message_
    ) internal {
        MESSENGER.sendMessage(crossDomainTarget_, message_, gasLimit_);
    }

    /// @dev Enforces that the modified function is only callable by a specific cross-domain account
    /// @param sourceDomainAccount_ The only account on the originating domain which is
    ///     authenticated to call this function
    modifier onlyFromCrossDomainAccount(address sourceDomainAccount_) {
        if (msg.sender != address(MESSENGER)) {
            revert ErrorUnauthorizedMessenger();
        }
        if (MESSENGER.xDomainMessageSender() != sourceDomainAccount_) {
            revert ErrorWrongCrossDomainSender();
        }
        _;
    }

    error ErrorZeroAddressMessenger();
    error ErrorUnauthorizedMessenger();
    error ErrorWrongCrossDomainSender();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author kovalgek
/// @notice A subset of chainlink data feed interface for token rate oracle.
interface IChainlinkAggregatorInterface {
    /// @notice get the latest token rate data.
    /// @return roundId_ is a unique id for each answer. The value is based on timestamp.
    /// @return answer_ is wstETH/stETH token rate. It is a chainlink convention to return int256.
    /// @return startedAt_ is time when rate was pushed on L1 side.
    /// @return updatedAt_ is the same as startedAt_.
    /// @return answeredInRound_ is the same as roundId_.
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId_,
            int256 answer_,
            uint256 startedAt_,
            uint256 updatedAt_,
            uint80 answeredInRound_
        );

    /// @notice get the lastest token rate.
    /// @return wstETH/stETH token rate. It is a chainlink convention to return int256.
    function latestAnswer() external view returns (int256);

    /// @notice represents the number of decimals the oracle responses represent.
    /// @return decimals of the oracle response.
    function decimals() external view returns (uint8);
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

interface ICrossDomainMessenger {
    function xDomainMessageSender() external view returns (address);

    /// Sends a cross domain message to the target messenger.
    /// @param _target Target contract address.
    /// @param _message Message to send to the target.
    /// @param _gasLimit Gas limit for the provided message.
    function sendMessage(
        address _target,
        bytes calldata _message,
        uint32 _gasLimit
    ) external;
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @notice The L1 Standard bridge locks bridged tokens on the L1 side, sends deposit messages
///     on the L2 side, and finalizes token withdrawals from L2.
interface IL1ERC20Bridge {
    event ERC20DepositInitiated(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event ERC20WithdrawalFinalized(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    /// @notice get the address of the corresponding L2 bridge contract.
    /// @return Address of the corresponding L2 bridge contract.
    function l2TokenBridge() external returns (address);

    /// @notice deposit an amount of the ERC20 to the caller's balance on L2.
    /// @param l1Token_ Address of the L1 ERC20 we are depositing
    /// @param l2Token_ Address of the L1 respective L2 ERC20
    /// @param amount_ Amount of the ERC20 to deposit
    /// @param l2Gas_ Gas limit required to complete the deposit on L2.
    /// @param data_ Optional data to forward to L2. This data is provided
    ///        solely as a convenience for external contracts. Aside from enforcing a maximum
    ///        length, these contracts provide no guarantees about its content.
    function depositERC20(
        address l1Token_,
        address l2Token_,
        uint256 amount_,
        uint32 l2Gas_,
        bytes calldata data_
    ) external;

    /// @notice deposit an amount of ERC20 to a recipient's balance on L2.
    /// @param l1Token_ Address of the L1 ERC20 we are depositing
    /// @param l2Token_ Address of the L1 respective L2 ERC20
    /// @param to_ L2 address to credit the withdrawal to.
    /// @param amount_ Amount of the ERC20 to deposit.
    /// @param l2Gas_ Gas limit required to complete the deposit on L2.
    /// @param data_ Optional data to forward to L2. This data is provided
    ///        solely as a convenience for external contracts. Aside from enforcing a maximum
    ///        length, these contracts provide no guarantees about its content.
    function depositERC20To(
        address l1Token_,
        address l2Token_,
        address to_,
        uint256 amount_,
        uint32 l2Gas_,
        bytes calldata data_
    ) external;

    /// @notice Complete a withdrawal from L2 to L1, and credit funds to the recipient's balance of the
    /// L1 ERC20 token.
    /// @dev This call will fail if the initialized withdrawal from L2 has not been finalized.
    /// @param l1Token_ Address of L1 token to finalizeWithdrawal for.
    /// @param l2Token_ Address of L2 token where withdrawal was initiated.
    /// @param from_ L2 address initiating the transfer.
    /// @param to_ L1 address to credit the withdrawal to.
    /// @param amount_ Amount of the ERC20 to deposit.
    /// @param data_ Data provided by the sender on L2. This data is provided
    ///   solely as a convenience for external contracts. Aside from enforcing a maximum
    ///   length, these contracts provide no guarantees about its content.
    function finalizeERC20Withdrawal(
        address l1Token_,
        address l2Token_,
        address from_,
        address to_,
        uint256 amount_,
        bytes calldata data_
    ) external;
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @notice The L2 token bridge works with the L1 token bridge to enable ERC20 token bridging
///     between L1 and L2. It acts as a minter for new tokens when it hears about
///     deposits into the L1 token bridge. It also acts as a burner of the tokens
///     intended for withdrawal, informing the L1 bridge to release L1 funds.
interface IL2ERC20Bridge {
    event WithdrawalInitiated(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event DepositFinalized(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    /// @notice Returns the address of the corresponding L1 bridge contract
    function l1TokenBridge() external returns (address);

    /// @notice Initiates a withdraw of some tokens to the caller's account on L1
    /// @param l2Token_ Address of L2 token where withdrawal was initiated.
    /// @param amount_ Amount of the token to withdraw.
    /// @param l1Gas_ Minimum gas limit to use for the transaction.
    /// @param data_ Optional data to forward to L1. This data is provided
    ///     solely as a convenience for external contracts. Aside from enforcing a maximum
    ///     length, these contracts provide no guarantees about its content.
    function withdraw(
        address l2Token_,
        uint256 amount_,
        uint32 l1Gas_,
        bytes calldata data_
    ) external;

    /// @notice Initiates a withdraw of some token to a recipient's account on L1.
    /// @param l2Token_ Address of L2 token where withdrawal is initiated.
    /// @param to_ L1 adress to credit the withdrawal to.
    /// @param amount_ Amount of the token to withdraw.
    /// @param l1Gas_ Minimum gas limit to use for the transaction.
    /// @param data_ Optional data to forward to L1. This data is provided
    ///     solely as a convenience for external contracts. Aside from enforcing a maximum
    ///     length, these contracts provide no guarantees about its content.
    function withdrawTo(
        address l2Token_,
        address to_,
        uint256 amount_,
        uint32 l1Gas_,
        bytes calldata data_
    ) external;

    /// @notice Completes a deposit from L1 to L2, and credits funds to the recipient's balance of
    ///     this L2 token. This call will fail if it did not originate from a corresponding deposit
    ///     in L1StandardTokenBridge.
    /// @param l1Token_ Address for the l1 token this is called with
    /// @param l2Token_ Address for the l2 token this is called with
    /// @param from_ Account to pull the deposit from on L2.
    /// @param to_ Address to receive the withdrawal at
    /// @param amount_ Amount of the token to withdraw
    /// @param data_ Data provider by the sender on L1. This data is provided
    ///     solely as a convenience for external contracts. Aside from enforcing a maximum
    ///     length, these contracts provide no guarantees about its content.
    function finalizeDeposit(
        address l1Token_,
        address l2Token_,
        address from_,
        address to_,
        uint256 amount_,
        bytes calldata data_
    ) external;
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author kovalgek
/// @notice An interface for updating token rate of token rate oracle.
interface ITokenRateUpdatable {
    /// @notice Updates token rate.
    /// @param tokenRate_ wstETH/stETH token rate.
    /// @param rateUpdatedL1Timestamp_ L1 time when rate was updated on L1 side.
    function updateRate(uint256 tokenRate_, uint256 rateUpdatedL1Timestamp_) external;
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author psirex, kovalgek
/// @notice Contains the logic for validation of tokens used in the bridging process
contract RebasableAndNonRebasableTokens {

    /// @notice Address of the bridged non rebasable token in the L1 chain
    address public immutable L1_TOKEN_NON_REBASABLE;

    /// @notice Address of the bridged rebasable token in the L1 chain
    address public immutable L1_TOKEN_REBASABLE;

    /// @notice Address of the non rebasable token minted on the L2 chain when token bridged
    address public immutable L2_TOKEN_NON_REBASABLE;

    /// @notice Address of the rebasable token minted on the L2 chain when token bridged
    address public immutable L2_TOKEN_REBASABLE;

    /// @param l1TokenNonRebasable_ Address of the bridged non rebasable token in the L1 chain
    /// @param l1TokenRebasable_ Address of the bridged rebasable token in the L1 chain
    /// @param l2TokenNonRebasable_ Address of the non rebasable token minted on the L2 chain when token bridged
    /// @param l2TokenRebasable_ Address of the rebasable token minted on the L2 chain when token bridged
    constructor(
        address l1TokenNonRebasable_,
        address l1TokenRebasable_,
        address l2TokenNonRebasable_,
        address l2TokenRebasable_
    ) {
        if (l1TokenNonRebasable_ == address(0)) {
            revert ErrorZeroAddressL1TokenNonRebasable();
        }
        if (l1TokenRebasable_ == address(0)) {
            revert ErrorZeroAddressL1TokenRebasable();
        }
        if (l2TokenNonRebasable_ == address(0)) {
            revert ErrorZeroAddressL2TokenNonRebasable();
        }
        if (l2TokenRebasable_ == address(0)) {
            revert ErrorZeroAddressL2TokenRebasable();
        }
        L1_TOKEN_NON_REBASABLE = l1TokenNonRebasable_;
        L1_TOKEN_REBASABLE = l1TokenRebasable_;
        L2_TOKEN_NON_REBASABLE = l2TokenNonRebasable_;
        L2_TOKEN_REBASABLE = l2TokenRebasable_;
    }

    function _isSupportedL1L2TokensPair(address l1Token_, address l2Token_) internal view returns (bool) {
        bool isNonRebasablePair = l1Token_ == L1_TOKEN_NON_REBASABLE && l2Token_ == L2_TOKEN_NON_REBASABLE;
        bool isRebasablePair = l1Token_ == L1_TOKEN_REBASABLE && l2Token_ == L2_TOKEN_REBASABLE;
        return isNonRebasablePair || isRebasablePair;
    }

    function _getL1Token(address l2Token_) internal view returns (address) {
        if (l2Token_ == L2_TOKEN_NON_REBASABLE) { return L1_TOKEN_NON_REBASABLE; }
        if (l2Token_ == L2_TOKEN_REBASABLE) { return L1_TOKEN_REBASABLE; }
        revert ErrorUnsupportedL2Token(l2Token_);
    }

    /// @dev Validates that passed l1Token_ and l2Token_ tokens pair is supported by the bridge.
    modifier onlySupportedL1L2TokensPair(address l1Token_, address l2Token_) {
        if (!_isSupportedL1L2TokensPair(l1Token_, l2Token_)) {
            revert ErrorUnsupportedL1L2TokensPair(l1Token_, l2Token_);
        }
        _;
    }

    /// @dev Validates that passed l2Token_ is supported by the bridge
    modifier onlySupportedL2Token(address l2Token_) {
        if (l2Token_ != L2_TOKEN_NON_REBASABLE && l2Token_ != L2_TOKEN_REBASABLE) {
            revert ErrorUnsupportedL2Token(l2Token_);
        }
        _;
    }

    /// @dev validates that account_ is not zero address
    modifier onlyNonZeroAccount(address account_) {
        if (account_ == address(0)) {
            revert ErrorAccountIsZeroAddress();
        }
        _;
    }

    error ErrorZeroAddressL1TokenNonRebasable();
    error ErrorZeroAddressL1TokenRebasable();
    error ErrorZeroAddressL2TokenNonRebasable();
    error ErrorZeroAddressL2TokenRebasable();
    error ErrorUnsupportedL2Token(address l2Token);
    error ErrorUnsupportedL1L2TokensPair(address l1Token, address l2Token);
    error ErrorAccountIsZeroAddress();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {ITokenRateUpdatable} from "./interfaces/ITokenRateUpdatable.sol";
import {IChainlinkAggregatorInterface} from "./interfaces/IChainlinkAggregatorInterface.sol";
import {CrossDomainEnabled} from "./CrossDomainEnabled.sol";
import {Versioned} from "../utils/Versioned.sol";
import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {UnstructuredStorage} from "../lib/UnstructuredStorage.sol";

interface ITokenRateOracle is ITokenRateUpdatable, IChainlinkAggregatorInterface {}

/// @author kovalgek
/// @notice Oracle for storing and providing token rate.
///         NB: Cross-chain apps and CEXes should fetch the token rate specific to the chain for deposits/withdrawals
///         and compare against the token rate on L1 being an ultimate source of truth;
///         If the L1 rate differs, it can be pushed permissionlessly via OpStackTokenRatePusher.
/// @dev Token rate updates can be delivered from two sources: L1 token rate pusher and L2 bridge.
contract TokenRateOracle is ITokenRateOracle, CrossDomainEnabled, AccessControl, Versioned {

    using UnstructuredStorage for bytes32;

    /// @dev Used to store historical data of rate and times.
    struct TokenRateData {
        /// @notice wstETH/stETH token rate.
        uint128 tokenRate;
        /// @notice last time when token rate was updated on L1.
        uint64 rateUpdatedL1Timestamp;
        /// @notice last time when token rate was received on L2.
        uint64 rateReceivedL2Timestamp;
    } // occupies a single slot

    /// @notice A bridge which can update oracle.
    address public immutable L2_ERC20_TOKEN_BRIDGE;

    /// @notice An address of account on L1 that can update token rate.
    address public immutable L1_TOKEN_RATE_PUSHER;

    /// @notice A time period when token rate can be considered outdated.
    uint256 public immutable TOKEN_RATE_OUTDATED_DELAY;

    /// @notice A time difference between received l1Timestamp and L2 block.timestamp
    ///         when token rate can be considered outdated.
    uint256 public immutable MAX_ALLOWED_L2_TO_L1_CLOCK_LAG;

    /// @notice Allowed token rate deviation per day in basic points.
    uint256 public immutable MAX_ALLOWED_TOKEN_RATE_DEVIATION_PER_DAY_BP;

    /// @notice The maximum allowed time difference between the current time and the last received
    ///         token rate update that can be set during a pause. This is required to limit the pause role
    ///         and mitigate potential economic attacks.
    ///         See the 'pauseTokenRateUpdates()' method
    uint256 public immutable OLDEST_RATE_ALLOWED_IN_PAUSE_TIME_SPAN;

    /// @notice The minimum delta time between two L1 timestamps of token rate updates.
    uint256 public immutable MIN_TIME_BETWEEN_TOKEN_RATE_UPDATES;

    /// @notice Decimals of the oracle response.
    uint8 public constant DECIMALS = 27;

    /// @notice Max sane token rate value.
    uint256 public constant MAX_SANE_TOKEN_RATE = 10 ** (DECIMALS + 2);

    /// @notice Min sane token rate value.
    uint256 public constant MIN_SANE_TOKEN_RATE = 10 ** (DECIMALS - 2);

    /// @dev Role granting the permission to pause updating rate.
    bytes32 public constant RATE_UPDATE_DISABLER_ROLE = keccak256("TokenRateOracle.RATE_UPDATE_DISABLER_ROLE");

    /// @dev Role granting the permission to resume updating rate.
    bytes32 public constant RATE_UPDATE_ENABLER_ROLE = keccak256("TokenRafteOracle.RATE_UPDATE_ENABLER_ROLE");

    /// @notice Basic point scale.
    uint256 private constant BASIS_POINT_SCALE = 1e4;

    /// @notice Number of seconds in one day.
    uint256 private constant ONE_DAY_SECONDS = 86400;

    /// @notice Flag to pause token rate updates slot position.
    bytes32 private constant PAUSE_TOKEN_RATE_UPDATES_SLOT = keccak256("TokenRateOracle.PAUSE_TOKEN_RATE_UPDATES_SLOT");

    /// @notice Token rates array slot position.
    bytes32 private constant TOKEN_RATES_DATA_SLOT = keccak256("TokenRateOracle.TOKEN_RATES_DATA_SLOT");

    /// @param messenger_ L2 messenger address being used for cross-chain communications
    /// @param l2ERC20TokenBridge_ the bridge address that has a right to updates oracle.
    /// @param l1TokenRatePusher_ An address of account on L1 that can update token rate.
    /// @param tokenRateOutdatedDelay_ time period when token rate can be considered outdated.
    /// @param maxAllowedL2ToL1ClockLag_ A time difference between received l1Timestamp and L2 block.timestamp
    ///         when token rate can be considered outdated.
    /// @param maxAllowedTokenRateDeviationPerDayBp_ Allowed token rate deviation per day in basic points.
    ///        Can't be bigger than BASIS_POINT_SCALE.
    /// @param oldestRateAllowedInPauseTimeSpan_ Maximum allowed time difference between the current time
    ///        and the last received token rate update that can be set during a pause.
    /// @param minTimeBetweenTokenRateUpdates_ Minimum delta time between two
    ///        L1 timestamps of token rate updates.
    constructor(
        address messenger_,
        address l2ERC20TokenBridge_,
        address l1TokenRatePusher_,
        uint256 tokenRateOutdatedDelay_,
        uint256 maxAllowedL2ToL1ClockLag_,
        uint256 maxAllowedTokenRateDeviationPerDayBp_,
        uint256 oldestRateAllowedInPauseTimeSpan_,
        uint256 minTimeBetweenTokenRateUpdates_
    ) CrossDomainEnabled(messenger_) {
        if (l2ERC20TokenBridge_ == address(0)) {
            revert ErrorZeroAddressL2ERC20TokenBridge();
        }
        if (l1TokenRatePusher_ == address(0)) {
            revert ErrorZeroAddressL1TokenRatePusher();
        }
        if (maxAllowedTokenRateDeviationPerDayBp_ == 0 || maxAllowedTokenRateDeviationPerDayBp_ > BASIS_POINT_SCALE) {
            revert ErrorMaxTokenRateDeviationIsOutOfRange();
        }
        L2_ERC20_TOKEN_BRIDGE = l2ERC20TokenBridge_;
        L1_TOKEN_RATE_PUSHER = l1TokenRatePusher_;
        TOKEN_RATE_OUTDATED_DELAY = tokenRateOutdatedDelay_;
        MAX_ALLOWED_L2_TO_L1_CLOCK_LAG = maxAllowedL2ToL1ClockLag_;
        MAX_ALLOWED_TOKEN_RATE_DEVIATION_PER_DAY_BP = maxAllowedTokenRateDeviationPerDayBp_;
        OLDEST_RATE_ALLOWED_IN_PAUSE_TIME_SPAN = oldestRateAllowedInPauseTimeSpan_;
        MIN_TIME_BETWEEN_TOKEN_RATE_UPDATES = minTimeBetweenTokenRateUpdates_;
    }

    /// @notice Initializes the contract from scratch.
    /// @param admin_ Address of the account to grant the DEFAULT_ADMIN_ROLE
    /// @param tokenRate_ wstETH/stETH token rate, uses 10**DECIMALS precision.
    /// @param rateUpdatedL1Timestamp_ L1 time when rate was updated on L1 side.
    function initialize(address admin_, uint256 tokenRate_, uint256 rateUpdatedL1Timestamp_) external {
        _initializeContractVersionTo(1);
        if (admin_ == address(0)) {
            revert ErrorZeroAddressAdmin();
        }
        if (tokenRate_ < MIN_SANE_TOKEN_RATE || tokenRate_ > MAX_SANE_TOKEN_RATE) {
            revert ErrorTokenRateIsOutOfSaneRange(tokenRate_);
        }
        if (rateUpdatedL1Timestamp_ > block.timestamp + MAX_ALLOWED_L2_TO_L1_CLOCK_LAG) {
            revert ErrorL1TimestampExceededMaxAllowedClockLag(rateUpdatedL1Timestamp_);
        }
        _grantRole(DEFAULT_ADMIN_ROLE, admin_);
        _addTokenRate(tokenRate_, rateUpdatedL1Timestamp_, block.timestamp);
    }

    /// @notice Pauses token rate updates and sets the old rate provided by tokenRateIndex_.
    ///         Should be called by DAO or emergency brakes only.
    /// @param tokenRateIndex_ The index of the token rate that applies after the pause.
    ///        Token Rate can't be received older then OLDEST_RATE_ALLOWED_IN_PAUSE_TIME_SPAN
    ///        except only if the passed index is the latest one.
    function pauseTokenRateUpdates(uint256 tokenRateIndex_) external onlyRole(RATE_UPDATE_DISABLER_ROLE) {
        if (_isPaused()) {
            revert ErrorAlreadyPaused();
        }
        TokenRateData memory tokenRateData = _getTokenRateByIndex(tokenRateIndex_);
        if (tokenRateIndex_ != _getStorageTokenRates().length - 1 &&
            tokenRateData.rateReceivedL2Timestamp < block.timestamp - OLDEST_RATE_ALLOWED_IN_PAUSE_TIME_SPAN) {
            revert ErrorTokenRateUpdateTooOld();
        }
        _removeElementsAfterIndex(tokenRateIndex_);
        _setPause(true);
        emit TokenRateUpdatesPaused(tokenRateData.tokenRate, tokenRateData.rateUpdatedL1Timestamp);
        emit RateUpdated(tokenRateData.tokenRate, tokenRateData.rateUpdatedL1Timestamp);
    }

    /// @notice Resume token rate updates applying provided token rate.
    /// @param tokenRate_ a new token rate that applies after resuming.
    /// @param rateUpdatedL1Timestamp_ L1 time when rate was updated on L1 side.
    function resumeTokenRateUpdates(
        uint256 tokenRate_,
        uint256 rateUpdatedL1Timestamp_
    ) external onlyRole(RATE_UPDATE_ENABLER_ROLE) {
        if (!_isPaused()) {
            revert ErrorAlreadyResumed();
        }
        if (tokenRate_ < MIN_SANE_TOKEN_RATE || tokenRate_ > MAX_SANE_TOKEN_RATE) {
            revert ErrorTokenRateIsOutOfSaneRange(tokenRate_);
        }
        if (rateUpdatedL1Timestamp_ > block.timestamp + MAX_ALLOWED_L2_TO_L1_CLOCK_LAG) {
            revert ErrorL1TimestampExceededMaxAllowedClockLag(rateUpdatedL1Timestamp_);
        }
        if (rateUpdatedL1Timestamp_ < _getLastTokenRate().rateUpdatedL1Timestamp) {
            revert ErrorL1TimestampOlderThanPrevious(rateUpdatedL1Timestamp_);
        }
        _addTokenRate(tokenRate_, rateUpdatedL1Timestamp_, block.timestamp);
        _setPause(false);
        emit TokenRateUpdatesResumed(tokenRate_, rateUpdatedL1Timestamp_);
        emit RateUpdated(tokenRate_, rateUpdatedL1Timestamp_);
    }

    /// @notice Shows that token rate updates are paused or not.
    function isTokenRateUpdatesPaused() external view returns (bool) {
        return _isPaused();
    }

    /// @notice Returns token rate data by index.
    /// @param tokenRateIndex_ an index of token rate data.
    function getTokenRateByIndex(uint256 tokenRateIndex_) external view returns (TokenRateData memory) {
        return _getTokenRateByIndex(tokenRateIndex_);
    }

    /// @notice Returns token rates data length.
    function getTokenRatesLength() external view returns (uint256) {
        return _getStorageTokenRates().length;
    }

    /// @inheritdoc IChainlinkAggregatorInterface
    function latestRoundData() external view returns (
        uint80 roundId_,
        int256 answer_,
        uint256 startedAt_,
        uint256 updatedAt_,
        uint80 answeredInRound_
    ) {
        TokenRateData memory tokenRateData = _getLastTokenRate();
        return (
            uint80(tokenRateData.rateUpdatedL1Timestamp),
            int256(uint256(tokenRateData.tokenRate)),
            tokenRateData.rateUpdatedL1Timestamp,
            tokenRateData.rateReceivedL2Timestamp,
            uint80(tokenRateData.rateUpdatedL1Timestamp)
        );
    }

    /// @inheritdoc IChainlinkAggregatorInterface
    function latestAnswer() external view returns (int256) {
        TokenRateData memory tokenRateData = _getLastTokenRate();
        return int256(uint256(tokenRateData.tokenRate));
    }

    /// @inheritdoc IChainlinkAggregatorInterface
    function decimals() external pure returns (uint8) {
        return DECIMALS;
    }

    /// @inheritdoc ITokenRateUpdatable
    function updateRate(
        uint256 tokenRate_,
        uint256 rateUpdatedL1Timestamp_
    ) external onlyBridgeOrTokenRatePusher {
        if (_isPaused()) {
            emit TokenRateUpdateAttemptDuringPause();
            return;
        }

        TokenRateData storage tokenRateData = _getLastTokenRate();

        /// @dev checks if the clock lag (i.e, time difference) between L1 and L2 exceeds the configurable threshold
        if (rateUpdatedL1Timestamp_ > block.timestamp + MAX_ALLOWED_L2_TO_L1_CLOCK_LAG) {
            revert ErrorL1TimestampExceededAllowedClockLag(tokenRate_, rateUpdatedL1Timestamp_);
        }

        /// @dev Use only the most up-to-date token rate. Reverting should be avoided as it may occur occasionally.
        if (rateUpdatedL1Timestamp_ < tokenRateData.rateUpdatedL1Timestamp) {
            emit DormantTokenRateUpdateIgnored(rateUpdatedL1Timestamp_, tokenRateData.rateUpdatedL1Timestamp);
            return;
        }

        /// @dev Bump L2 receipt time, don't touch the rate othwerwise
        /// NB: Here we assume that the rate can only be changed together with the token rebase induced
        /// by the AccountingOracle report
        if (rateUpdatedL1Timestamp_ == tokenRateData.rateUpdatedL1Timestamp) {
            tokenRateData.rateReceivedL2Timestamp = uint64(block.timestamp);
            emit RateReceivedTimestampUpdated(block.timestamp);
            return;
        }

        /// @dev This condition was made under the assumption that the L1 timestamps can be manipulated.
        if (rateUpdatedL1Timestamp_ < tokenRateData.rateUpdatedL1Timestamp + MIN_TIME_BETWEEN_TOKEN_RATE_UPDATES) {
            emit UpdateRateIsTooOften(rateUpdatedL1Timestamp_, tokenRateData.rateUpdatedL1Timestamp);
            return;
        }

        /// @dev allow token rate to be within some configurable range that depens on time it wasn't updated.
        if (!_isTokenRateWithinAllowedRange(
            tokenRateData.tokenRate,
            tokenRate_,
            tokenRateData.rateUpdatedL1Timestamp,
            rateUpdatedL1Timestamp_)
        ) {
            revert ErrorTokenRateIsOutOfRange(tokenRate_, rateUpdatedL1Timestamp_);
        }

        /// @dev notify that there is a differnce L1 and L2 time.
        if (rateUpdatedL1Timestamp_ > block.timestamp) {
            emit TokenRateL1TimestampIsInFuture(tokenRate_, rateUpdatedL1Timestamp_);
        }

        _addTokenRate(tokenRate_, rateUpdatedL1Timestamp_, block.timestamp);
        emit RateUpdated(tokenRate_, rateUpdatedL1Timestamp_);
    }

    /// @notice Returns flag that shows that token rate can be considered outdated.
    function isLikelyOutdated() external view returns (bool) {
        return (block.timestamp > _getLastTokenRate().rateReceivedL2Timestamp + TOKEN_RATE_OUTDATED_DELAY) ||
            _isPaused();
    }

    /// @notice Allow tokenRate deviation from the previous value to be
    ///         ±`MAX_ALLOWED_TOKEN_RATE_DEVIATION_PER_DAY` BP per day.
    function _isTokenRateWithinAllowedRange(
        uint256 currentTokenRate_,
        uint256 newTokenRate_,
        uint256 currentRateL1Timestamp_,
        uint256 newRateL1Timestamp_
    ) internal view returns (bool) {
        uint256 allowedTokenRateDeviation = _allowedTokenRateDeviation(newRateL1Timestamp_, currentRateL1Timestamp_);
        return newTokenRate_ <= _maxTokenRateLimit(currentTokenRate_, allowedTokenRateDeviation) &&
               newTokenRate_ >= _minTokenRateLimit(currentTokenRate_, allowedTokenRateDeviation);
    }

    /// @dev Returns the allowed token deviation depending on the number of days passed since the last update.
    function _allowedTokenRateDeviation(
        uint256 newRateL1Timestamp_,
        uint256 currentRateL1Timestamp_
    ) internal view returns (uint256) {
        uint256 rateL1TimestampDiff = newRateL1Timestamp_ - currentRateL1Timestamp_;
        uint256 roundedUpNumberOfDays = (rateL1TimestampDiff + ONE_DAY_SECONDS - 1) / ONE_DAY_SECONDS;
        return roundedUpNumberOfDays * MAX_ALLOWED_TOKEN_RATE_DEVIATION_PER_DAY_BP;
    }

    /// @dev Returns the maximum allowable value for the token rate.
    function _maxTokenRateLimit(
        uint256 currentTokenRate,
        uint256 allowedTokenRateDeviation
    ) internal pure returns (uint256) {
        uint256 maxTokenRateLimit = currentTokenRate * (BASIS_POINT_SCALE + allowedTokenRateDeviation) /
            BASIS_POINT_SCALE;
        return Math.min(maxTokenRateLimit, MAX_SANE_TOKEN_RATE);
    }

    /// @dev Returns the minimum allowable value for the token rate.
    function _minTokenRateLimit(
        uint256 currentTokenRate,
        uint256 allowedTokenRateDeviation
    ) internal pure returns (uint256) {
        uint256 minTokenRateLimit = MIN_SANE_TOKEN_RATE;
        if (allowedTokenRateDeviation <= BASIS_POINT_SCALE) {
            minTokenRateLimit = (currentTokenRate * (BASIS_POINT_SCALE - allowedTokenRateDeviation) /
            BASIS_POINT_SCALE);
        }
        return Math.max(minTokenRateLimit, MIN_SANE_TOKEN_RATE);
    }

    function _isCallerBridgeOrMessengerWithTokenRatePusher(address caller_) internal view returns (bool) {
        if (caller_ == L2_ERC20_TOKEN_BRIDGE) {
            return true;
        }
        if (caller_ == address(MESSENGER) && MESSENGER.xDomainMessageSender() == L1_TOKEN_RATE_PUSHER) {
            return true;
        }
        return false;
    }

    function _addTokenRate(
        uint256 tokenRate_, uint256 rateUpdatedL1Timestamp_, uint256 rateReceivedL2Timestamp_
    ) internal {
        _getStorageTokenRates().push(TokenRateData({
            tokenRate: uint128(tokenRate_),
            rateUpdatedL1Timestamp: uint64(rateUpdatedL1Timestamp_),
            rateReceivedL2Timestamp: uint64(rateReceivedL2Timestamp_)
        }));
    }

    function _getLastTokenRate() internal view returns (TokenRateData storage) {
        return _getTokenRateByIndex(_getStorageTokenRates().length - 1);
    }

    function _getTokenRateByIndex(uint256 tokenRateIndex_) internal view returns (TokenRateData storage) {
        if (tokenRateIndex_ >= _getStorageTokenRates().length) {
            revert ErrorWrongTokenRateIndex();
        }
        return _getStorageTokenRates()[tokenRateIndex_];
    }

    function _getStorageTokenRates() internal pure returns (TokenRateData [] storage result) {
        bytes32 position = TOKEN_RATES_DATA_SLOT;
        assembly {
            result.slot := position
        }
    }

    /// @dev tokenRateIndex_ is limited by time in the past and the number of elements also has restrictions.
    /// Therefore, this loop can't consume a lot of gas.
    function _removeElementsAfterIndex(uint256 tokenRateIndex_) internal {
        uint256 tokenRatesLength = _getStorageTokenRates().length;
        if (tokenRateIndex_ >= tokenRatesLength) {
            return;
        }
        uint256 numberOfElementsToRemove = tokenRatesLength - tokenRateIndex_ - 1;
        for (uint256 i = 0; i < numberOfElementsToRemove; i++) {
            _getStorageTokenRates().pop();
        }
    }

    function _setPause(bool pause) internal {
        PAUSE_TOKEN_RATE_UPDATES_SLOT.setStorageBool(pause);
    }

    function _isPaused() internal view returns (bool) {
        return PAUSE_TOKEN_RATE_UPDATES_SLOT.getStorageBool();
    }

    modifier onlyBridgeOrTokenRatePusher() {
        if (!_isCallerBridgeOrMessengerWithTokenRatePusher(msg.sender)) {
            revert ErrorNotBridgeOrTokenRatePusher();
        }
        _;
    }

    event RateUpdated(uint256 tokenRate_, uint256 indexed rateL1Timestamp_);
    event RateReceivedTimestampUpdated(uint256 indexed rateReceivedL2Timestamp);
    event DormantTokenRateUpdateIgnored(uint256 indexed newRateL1Timestamp_, uint256 indexed currentRateL1Timestamp_);
    event TokenRateL1TimestampIsInFuture(uint256 tokenRate_, uint256 indexed rateL1Timestamp_);
    event TokenRateUpdatesPaused(uint256 tokenRate_, uint256 indexed rateL1Timestamp_);
    event TokenRateUpdatesResumed(uint256 tokenRate_, uint256 indexed rateL1Timestamp_);
    event TokenRateUpdateAttemptDuringPause();
    event UpdateRateIsTooOften(uint256 indexed newRateL1Timestamp_, uint256 indexed currentRateL1Timestamp_);

    error ErrorZeroAddressAdmin();
    error ErrorWrongTokenRateIndex();
    error ErrorTokenRateUpdateTooOld();
    error ErrorAlreadyPaused();
    error ErrorAlreadyResumed();
    error ErrorZeroAddressL2ERC20TokenBridge();
    error ErrorZeroAddressL1TokenRatePusher();
    error ErrorNotBridgeOrTokenRatePusher();
    error ErrorL1TimestampExceededAllowedClockLag(uint256 tokenRate_, uint256 rateL1Timestamp_);
    error ErrorTokenRateIsOutOfRange(uint256 tokenRate_, uint256 rateL1Timestamp_);
    error ErrorMaxTokenRateDeviationIsOutOfRange();
    error ErrorTokenRateIsOutOfSaneRange(uint256 tokenRate_);
    error ErrorL1TimestampExceededMaxAllowedClockLag(uint256 rateL1Timestamp_);
    error ErrorL1TimestampOlderThanPrevious(uint256 rateL1Timestamp_);
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {ERC20Core} from "./ERC20Core.sol";
import {ERC20Metadata} from "./ERC20Metadata.sol";

/// @author psirex, kovalgek
/// @notice Extends the ERC20 functionality that allows the bridge to mint/burn tokens
interface IERC20Bridged is IERC20 {
    /// @notice Returns bridge which can mint and burn tokens on L2
    function bridge() external view returns (address);

    /// @notice Creates `amount_` tokens and assigns them to `account_`, increasing the total supply
    /// @param account_ An address of the account to mint tokens
    /// @param amount_ An amount of tokens to mint
    function bridgeMint(address account_, uint256 amount_) external;

    /// @notice Destroys `amount_` tokens from `account_`, reducing the total supply
    /// @param account_ An address of the account to burn tokens
    /// @param amount_ An amount of tokens to burn
    function bridgeBurn(address account_, uint256 amount_) external;
}

/// @author psirex, kovalgek
/// @notice Extends the ERC20 functionality that allows the bridge to mint/burn tokens
contract ERC20Bridged is IERC20Bridged, ERC20Core, ERC20Metadata {
    /// @inheritdoc IERC20Bridged
    address public immutable bridge;

    /// @param name_ The name of the token
    /// @param symbol_ The symbol of the token
    /// @param decimals_ The decimals places of the token
    /// @param bridge_ The bridge address which allows to mint/burn tokens
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        address bridge_
    ) ERC20Metadata(name_, symbol_, decimals_) {
        if (bridge_ == address(0)) {
            revert ErrorZeroAddressBridge();
        }
        bridge = bridge_;
    }

    /// @inheritdoc IERC20Bridged
    function bridgeMint(address account_, uint256 amount_) external onlyBridge {
        _mint(account_, amount_);
    }

    /// @inheritdoc IERC20Bridged
    function bridgeBurn(address account_, uint256 amount_) external onlyBridge {
        _burn(account_, amount_);
    }

    /// @notice Sets the name and the symbol of the tokens if they both are empty
    /// @param name_ The name of the token
    /// @param symbol_ The symbol of the token
    function _initializeERC20Metadata(string memory name_, string memory symbol_) internal {
        _setERC20MetadataName(name_);
        _setERC20MetadataSymbol(symbol_);
    }

    /// @dev Validates that sender of the transaction is the bridge
    modifier onlyBridge() {
        if (msg.sender != bridge) {
            revert ErrorNotBridge();
        }
        _;
    }

    error ErrorZeroAddressBridge();
    error ErrorNotBridge();
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

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

/// @author psirex
/// @notice Contains the required logic of the ERC20 standard as defined in the EIP. Additionally
///     provides methods for direct allowance increasing/decreasing.
contract ERC20Core is IERC20 {
    /// @inheritdoc IERC20
    uint256 public totalSupply;

    /// @inheritdoc IERC20
    mapping(address => uint256) public balanceOf;

    /// @inheritdoc IERC20
    mapping(address => mapping(address => uint256)) public allowance;

    /// @inheritdoc IERC20
    function approve(address spender_, uint256 amount_)
        external
        returns (bool)
    {
        _approve(msg.sender, spender_, amount_);
        return true;
    }

    /// @inheritdoc IERC20
    function transfer(address to_, uint256 amount_) external returns (bool) {
        _transfer(msg.sender, to_, amount_);
        return true;
    }

    /// @inheritdoc IERC20
    function transferFrom(
        address from_,
        address to_,
        uint256 amount_
    ) external returns (bool) {
        _spendAllowance(from_, msg.sender, amount_);
        _transfer(from_, to_, amount_);
        return true;
    }

    /// @dev Moves amount_ of tokens from sender_ to recipient_
    /// @param from_ An address of the sender of the tokens
    /// @param to_  An address of the recipient of the tokens
    /// @param amount_ An amount of tokens to transfer
    function _transfer(
        address from_,
        address to_,
        uint256 amount_
    ) internal onlyNonZeroAccount(from_) onlyNonZeroAccount(to_) {
        _decreaseBalance(from_, amount_);
        balanceOf[to_] += amount_;
        emit Transfer(from_, to_, amount_);
    }

    /// @dev Updates owner_'s allowance for spender_ based on spent amount_. Does not update
    ///     the allowance amount in case of infinite allowance
    /// @param owner_ An address of the account to spend allowance
    /// @param spender_  An address of the spender of the tokens
    /// @param amount_ An amount of allowance spend
    function _spendAllowance(
        address owner_,
        address spender_,
        uint256 amount_
    ) internal {
        uint256 currentAllowance = allowance[owner_][spender_];
        if (currentAllowance == type(uint256).max) {
            return;
        }
        if (amount_ > currentAllowance) {
            revert ErrorNotEnoughAllowance();
        }
        unchecked {
            _approve(owner_, spender_, currentAllowance - amount_);
        }
    }

    /// @dev Sets amount_ as the allowance of spender_ over the owner_'s tokens
    /// @param owner_ An address of the account to set allowance
    /// @param spender_  An address of the tokens spender
    /// @param amount_ An amount of tokens to allow to spend
    function _approve(
        address owner_,
        address spender_,
        uint256 amount_
    ) internal virtual onlyNonZeroAccount(owner_) onlyNonZeroAccount(spender_) {
        allowance[owner_][spender_] = amount_;
        emit Approval(owner_, spender_, amount_);
    }

    /// @dev Creates amount_ tokens and assigns them to account_, increasing the total supply
    /// @param account_ An address of the account to mint tokens
    /// @param amount_ An amount of tokens to mint
    function _mint(address account_, uint256 amount_)
        internal
        onlyNonZeroAccount(account_)
    {
        totalSupply += amount_;
        balanceOf[account_] += amount_;
        emit Transfer(address(0), account_, amount_);
    }

    /// @dev Destroys amount_ tokens from account_, reducing the total supply.
    /// @param account_ An address of the account to mint tokens
    /// @param amount_ An amount of tokens to mint
    function _burn(address account_, uint256 amount_)
        internal
        onlyNonZeroAccount(account_)
    {
        _decreaseBalance(account_, amount_);
        totalSupply -= amount_;
        emit Transfer(account_, address(0), amount_);
    }

    /// @dev Decreases the balance of the account_
    /// @param account_ An address of the account to decrease balance
    /// @param amount_ An amount of balance decrease
    function _decreaseBalance(address account_, uint256 amount_) internal {
        uint256 balance = balanceOf[account_];

        if (amount_ > balance) {
            revert ErrorNotEnoughBalance();
        }
        unchecked {
            balanceOf[account_] = balance - amount_;
        }
    }

    /// @dev validates that account_ is not zero address
    modifier onlyNonZeroAccount(address account_) {
        if (account_ == address(0)) {
            revert ErrorAccountIsZeroAddress();
        }
        _;
    }

    error ErrorNotEnoughBalance();
    error ErrorNotEnoughAllowance();
    error ErrorAccountIsZeroAddress();
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author psirex
/// @notice Interface for the optional metadata functions from the ERC20 standard.
interface IERC20Metadata {
    /// @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);
}

/// @author psirex
/// @notice Contains the optional metadata functions from the ERC20 standard
/// @dev Uses the UnstructuredStorage pattern to store dynamic name and symbol data. Might be used
///     with the upgradable proxies
contract ERC20Metadata is IERC20Metadata {
    /// @dev Stores the dynamic metadata of the ERC20 token. Allows safely use of this
    ///     contract with upgradable proxies
    struct DynamicMetadata {
        string name;
        string symbol;
    }

    /// @dev Location of the slot with DynamicMetdata
    ///      The slot's index string has a misspelling, but the contract storage will be broken without it.
    bytes32 private constant DYNAMIC_METADATA_SLOT =
        keccak256("ERC20Metdata.dynamicMetadata");

    /// @inheritdoc IERC20Metadata
    uint8 public immutable decimals;

    /// @param name_ Name of the token
    /// @param symbol_ Symbol of the token
    /// @param decimals_ Decimals places of the token
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) {
        if (decimals_ == 0) {
            revert ErrorZeroDecimals();
        }
        decimals = decimals_;
        _setERC20MetadataName(name_);
        _setERC20MetadataSymbol(symbol_);
    }

    /// @inheritdoc IERC20Metadata
    function name() public view returns (string memory) {
        return _loadDynamicMetadata().name;
    }

    /// @inheritdoc IERC20Metadata
    function symbol() public view returns (string memory) {
        return _loadDynamicMetadata().symbol;
    }

    /// @dev Sets the name of the token.
    function _setERC20MetadataName(string memory name_) internal {
        if (bytes(name_).length == 0) {
            revert ErrorNameIsEmpty();
        }
        _loadDynamicMetadata().name = name_;
    }

    /// @dev Sets the symbol of the token.
    function _setERC20MetadataSymbol(string memory symbol_) internal {
        if (bytes(symbol_).length == 0) {
            revert ErrorSymbolIsEmpty();
        }
        _loadDynamicMetadata().symbol = symbol_;
    }

    function _isMetadataInitialized() internal view returns (bool) {
        return bytes(name()).length != 0 && bytes(symbol()).length != 0;
    }

    /// @dev Returns the reference to the slot with DynamicMetadata struct
    function _loadDynamicMetadata()
        private
        pure
        returns (DynamicMetadata storage r)
    {
        bytes32 slot = DYNAMIC_METADATA_SLOT;
        assembly {
            r.slot := slot
        }
    }

    error ErrorZeroDecimals();
    error ErrorNameIsEmpty();
    error ErrorSymbolIsEmpty();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC20Wrapper} from "./interfaces/IERC20Wrapper.sol";
import {ITokenRateOracle} from "../optimism/TokenRateOracle.sol";
import {ERC20Metadata} from "./ERC20Metadata.sol";
import {UnstructuredRefStorage} from "../lib/UnstructuredRefStorage.sol";
import {UnstructuredStorage} from "../lib/UnstructuredStorage.sol";

/// @author kovalgek
/// @notice Extends the ERC20 functionality that allows the bridge to wrap/unwrap token.
interface IBridgeWrapper {
    /// @notice Returns bridge which can wrap/unwrap token on L2.
    function L2_ERC20_TOKEN_BRIDGE() external view returns (address);

    /// @notice Exchanges non-rebasable token (shares) to rebasable token. Can be called by bridge only.
    /// @param account_ an address of the account to exchange shares for.
    /// @param sharesAmount_ amount of non-rebasable token (shares).
    /// @return Amount of rebasable token.
    function bridgeWrap(address account_, uint256 sharesAmount_) external returns (uint256);

    /// @notice Exchanges rebasable token to non-rebasable (shares). Can be called by bridge only.
    /// @param account_ an address of the account to exchange token for.
    /// @param tokenAmount_ amount of rebasable token to uwrap in exchange for non-rebasable token (shares).
    /// @return Amount of non-rebasable token (shares) user receives after unwrap.
    function bridgeUnwrap(address account_, uint256 tokenAmount_) external returns (uint256);
}

/// @author kovalgek
/// @notice Rebasable token that wraps/unwraps non-rebasable token and allow to mint/burn tokens by bridge.
contract ERC20RebasableBridged is IERC20, IERC20Wrapper, IBridgeWrapper, ERC20Metadata {
    using SafeERC20 for IERC20;
    using UnstructuredRefStorage for bytes32;
    using UnstructuredStorage for bytes32;

    /// @inheritdoc IBridgeWrapper
    address public immutable L2_ERC20_TOKEN_BRIDGE;

    /// @notice Contract of non-rebasable token to wrap from.
    IERC20 public immutable TOKEN_TO_WRAP_FROM;

    /// @notice Oracle contract used to get token rate for wrapping/unwrapping tokens.
    ITokenRateOracle public immutable TOKEN_RATE_ORACLE;

    /// @notice Decimals of the oracle response.
    uint8 public immutable TOKEN_RATE_ORACLE_DECIMALS;

    /// @dev token allowance slot position.
    bytes32 internal constant TOKEN_ALLOWANCE_POSITION = keccak256("ERC20RebasableBridged.TOKEN_ALLOWANCE_POSITION");

    /// @dev user shares slot position.
    bytes32 internal constant SHARES_POSITION = keccak256("ERC20RebasableBridged.SHARES_POSITION");

    /// @dev token shares slot position.
    bytes32 internal constant TOTAL_SHARES_POSITION = keccak256("ERC20RebasableBridged.TOTAL_SHARES_POSITION");

    /// @param name_ The name of the token
    /// @param symbol_ The symbol of the token
    /// @param decimals_ The decimals places of the token
    /// @param tokenToWrapFrom_ address of the ERC20 token to wrap
    /// @param tokenRateOracle_ address of oracle that returns tokens rate
    /// @param l2ERC20TokenBridge_ The bridge address which allows to mint/burn tokens
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        address tokenToWrapFrom_,
        address tokenRateOracle_,
        address l2ERC20TokenBridge_
    ) ERC20Metadata(name_, symbol_, decimals_) {
        if (tokenToWrapFrom_ == address(0)) {
            revert ErrorZeroAddressTokenToWrapFrom();
        }
        if (tokenRateOracle_ == address(0)) {
            revert ErrorZeroAddressTokenRateOracle();
        }
        if (l2ERC20TokenBridge_ == address(0)) {
            revert ErrorZeroAddressL2ERC20TokenBridge();
        }
        TOKEN_TO_WRAP_FROM = IERC20(tokenToWrapFrom_);
        TOKEN_RATE_ORACLE = ITokenRateOracle(tokenRateOracle_);
        TOKEN_RATE_ORACLE_DECIMALS = TOKEN_RATE_ORACLE.decimals();
        L2_ERC20_TOKEN_BRIDGE = l2ERC20TokenBridge_;
    }

    /// @inheritdoc IERC20Wrapper
    function wrap(uint256 sharesAmount_) external returns (uint256) {
        return _wrap(msg.sender, msg.sender, sharesAmount_);
    }

    /// @inheritdoc IERC20Wrapper
    function unwrap(uint256 tokenAmount_) external returns (uint256) {
        return _unwrap(msg.sender, tokenAmount_);
    }

    /// @notice Exchanges rebasable token to non-rebasable by providing rebasable token shares.
    /// @param sharesAmount_ amount of rebasable token shares to unwrap.
    /// @return amount of non-rebasable token user receives after unwrap.
    function unwrapShares(uint256 sharesAmount_) external returns (uint256) {
        uint256 tokenAmount = _getTokensByShares(sharesAmount_);
        return _unwrapShares(msg.sender, sharesAmount_, tokenAmount);
    }

    /// @inheritdoc IBridgeWrapper
    function bridgeWrap(address account_, uint256 sharesAmount_) external onlyBridge returns (uint256) {
        return _wrap(L2_ERC20_TOKEN_BRIDGE, account_, sharesAmount_);
    }

    /// @inheritdoc IBridgeWrapper
    function bridgeUnwrap(address account_, uint256 tokenAmount_) external onlyBridge returns (uint256) {
        return _unwrap(account_, tokenAmount_);
    }

    /// @inheritdoc IERC20
    function allowance(address owner, address spender) external view returns (uint256) {
        return _getTokenAllowance()[owner][spender];
    }

    /// @inheritdoc IERC20
    function totalSupply() external view returns (uint256) {
        return _getTokensByShares(_getTotalShares());
    }

    /// @inheritdoc IERC20
    function balanceOf(address account_) external view returns (uint256) {
        return _getTokensByShares(_sharesOf(account_));
    }

    /// @notice Get shares amount of the provided account.
    /// @param account_ provided account address.
    /// @return amount of shares owned by `_account`.
    function sharesOf(address account_) external view returns (uint256) {
        return _sharesOf(account_);
    }

    /// @return total amount of shares.
    function getTotalShares() external view returns (uint256) {
        return _getTotalShares();
    }

    /// @notice Get amount of tokens for a given amount of shares.
    /// @param sharesAmount_ amount of shares.
    /// @return amount of tokens for a given shares amount.
    function getTokensByShares(uint256 sharesAmount_) external view returns (uint256) {
        return _getTokensByShares(sharesAmount_);
    }

    /// @notice Get amount of shares for a given amount of tokens.
    /// @param tokenAmount_ provided tokens amount.
    /// @return amount of shares for a given tokens amount.
    function getSharesByTokens(uint256 tokenAmount_) external view returns (uint256) {
        return _getSharesByTokens(tokenAmount_);
    }

    /// @inheritdoc IERC20
    function approve(address spender_, uint256 amount_) external returns (bool) {
        _approve(msg.sender, spender_, amount_);
        return true;
    }

    /// @inheritdoc IERC20
    function transfer(address to_, uint256 amount_) external returns (bool) {
        _transfer(msg.sender, to_, amount_);
        return true;
    }

    /// @inheritdoc IERC20
    function transferFrom(address from_, address to_, uint256 amount_) external returns (bool) {
        _spendAllowance(from_, msg.sender, amount_);
        _transfer(from_, to_, amount_);
        return true;
    }

    /// @notice Moves `sharesAmount_` token shares from the caller's account to the `recipient_` account.
    ///
    /// @return amount of transferred tokens.
    /// Emits a `TransferShares` event.
    /// Emits a `Transfer` event.
    ///
    /// Requirements:
    ///
    /// - `recipient_` cannot be the zero address.
    /// - the caller must have at least `sharesAmount_` shares.
    ///
    /// @dev The `sharesAmount_` argument is the amount of shares, not tokens.
    ///
    function transferShares(address recipient_, uint256 sharesAmount_) external returns (uint256) {
        _transferShares(msg.sender, recipient_, sharesAmount_);
        uint256 tokensAmount = _getTokensByShares(sharesAmount_);
        _emitTransferEvents(msg.sender, recipient_, tokensAmount, sharesAmount_);
        return tokensAmount;
    }

    /// @notice Moves `sharesAmount_` token shares from the `sender_` account to the `_recipient` account.
    ///
    /// @return amount of transferred tokens.
    /// Emits a `TransferShares` event.
    /// Emits a `Transfer` event.
    ///
    /// Requirements:
    ///
    /// - `sender_` and `_recipient` cannot be the zero addresses.
    /// - `sender_` must have at least `sharesAmount_` shares.
    /// - the caller must have allowance for `sender_`'s tokens of at least `_getTokensByShares(sharesAmount_)`.
    ///
    /// @dev The `_sharesAmount` argument is the amount of shares, not tokens.
    ///
    function transferSharesFrom(
        address sender_, address recipient_, uint256 sharesAmount_
    ) external returns (uint256) {
        uint256 tokensAmount = _getTokensByShares(sharesAmount_);
        _spendAllowance(sender_, msg.sender, tokensAmount);
        _transferShares(sender_, recipient_, sharesAmount_);
        _emitTransferEvents(sender_, recipient_, tokensAmount, sharesAmount_);
        return tokensAmount;
    }

    function _getTokenAllowance() internal pure returns (mapping(address => mapping(address => uint256)) storage) {
        return TOKEN_ALLOWANCE_POSITION.storageMapAddressMapAddressUint256();
    }

    /// @notice Amount of shares (locked wstETH amount) owned by the holder.
    function _getShares() internal pure returns (mapping(address => uint256) storage) {
        return SHARES_POSITION.storageMapAddressAddressUint256();
    }

    /// @notice The total amount of shares in existence.
    function _getTotalShares() internal view returns (uint256) {
        return TOTAL_SHARES_POSITION.getStorageUint256();
    }

    /// @notice Set total amount of shares.
    function _setTotalShares(uint256 _newTotalShares) internal {
        TOTAL_SHARES_POSITION.setStorageUint256(_newTotalShares);
    }

    /// @dev Moves amount_ of tokens from sender_ to recipient_
    /// @param from_ An address of the sender of the tokens
    /// @param to_  An address of the recipient of the tokens
    /// @param amount_ An amount of tokens to transfer
    function _transfer(
        address from_, address to_, uint256 amount_
    ) internal onlyNonZeroAccount(from_) onlyNonZeroAccount(to_) {
        uint256 sharesToTransfer = _getSharesByTokens(amount_);
        _transferShares(from_, to_, sharesToTransfer);
        _emitTransferEvents(from_, to_, amount_, sharesToTransfer);
    }

    /// @dev Updates owner_'s allowance for spender_ based on spent amount_. Does not update
    ///     the allowance amount in case of infinite allowance
    /// @param owner_ An address of the account to spend allowance
    /// @param spender_ An address of the spender of the tokens
    /// @param amount_ An amount of allowance spend
    function _spendAllowance(
        address owner_,
        address spender_,
        uint256 amount_
    ) internal {
        uint256 currentAllowance = _getTokenAllowance()[owner_][spender_];
        if (currentAllowance == type(uint256).max) {
            return;
        }
        if (amount_ > currentAllowance) {
            revert ErrorNotEnoughAllowance();
        }
        unchecked {
            _approve(owner_, spender_, currentAllowance - amount_);
        }
    }

    /// @dev Sets amount_ as the allowance of spender_ over the owner_'s tokens
    /// @param owner_ An address of the account to set allowance
    /// @param spender_ An address of the tokens spender
    /// @param amount_ An amount of tokens to allow to spend
    function _approve(
        address owner_,
        address spender_,
        uint256 amount_
    ) internal virtual onlyNonZeroAccount(owner_) onlyNonZeroAccount(spender_) {
        _getTokenAllowance()[owner_][spender_] = amount_;
        emit Approval(owner_, spender_, amount_);
    }

    function _sharesOf(address account_) internal view returns (uint256) {
        return _getShares()[account_];
    }

    function _getTokensByShares(uint256 sharesAmount_) internal view returns (uint256) {
        return (sharesAmount_ * _getTokenRate()) / (10 ** TOKEN_RATE_ORACLE_DECIMALS);
    }

    function _getSharesByTokens(uint256 tokenAmount_) internal view returns (uint256) {
        return (tokenAmount_ * (10 ** TOKEN_RATE_ORACLE_DECIMALS)) / _getTokenRate();
    }

    function _getTokenRate() internal view returns (uint256) {
        return uint256(TOKEN_RATE_ORACLE.latestAnswer());
    }

    /// @dev Creates `amount_` shares and assigns them to `account_`, increasing the total shares supply
    /// @param recipient_ An address of the account to mint shares
    /// @param amount_ An amount of shares to mint
    function _mintShares(
        address recipient_,
        uint256 amount_
    ) internal onlyNonZeroAccount(recipient_) {
        _setTotalShares(_getTotalShares() + amount_);
        _getShares()[recipient_] = _getShares()[recipient_] + amount_;
    }

    /// @dev Destroys `amount_` shares from `account_`, reducing the total shares supply.
    /// @param account_ An address of the account to mint shares
    /// @param amount_ An amount of shares to mint
    function _burnShares(
        address account_,
        uint256 amount_
    ) internal onlyNonZeroAccount(account_) {
        uint256 accountShares = _getShares()[account_];
        if (accountShares < amount_) revert ErrorNotEnoughBalance();
        _setTotalShares(_getTotalShares() - amount_);
        _getShares()[account_] = accountShares - amount_;
    }

    /// @dev  Moves `sharesAmount_` shares from `sender_` to `recipient_`.
    /// @param sender_ An address of the account to take shares
    /// @param recipient_ An address of the account to transfer shares
    /// @param sharesAmount_ An amount of shares to transfer
    function _transferShares(
        address sender_,
        address recipient_,
        uint256 sharesAmount_
    ) internal onlyNonZeroAccount(sender_) onlyNonZeroAccount(recipient_) {
        if (recipient_ == address(this)) revert ErrorTransferToRebasableContract();

        uint256 currentSenderShares = _getShares()[sender_];
        if (sharesAmount_ > currentSenderShares) revert ErrorNotEnoughBalance();

        _getShares()[sender_] = currentSenderShares - sharesAmount_;
        _getShares()[recipient_] = _getShares()[recipient_] + sharesAmount_;
    }

    /// @dev Emits `Transfer` and `TransferShares` events
    function _emitTransferEvents(
        address _from,
        address _to,
        uint256 _tokenAmount,
        uint256 _sharesAmount
    ) internal {
        emit Transfer(_from, _to, _tokenAmount);
        emit TransferShares(_from, _to, _sharesAmount);
    }

    /// @notice Sets the name and the symbol of the tokens if they both are empty
    /// @param name_ The name of the token
    /// @param symbol_ The symbol of the token
    function _initializeERC20Metadata(string memory name_, string memory symbol_) internal {
        _setERC20MetadataName(name_);
        _setERC20MetadataSymbol(symbol_);
    }

    function _wrap(address from_, address to_, uint256 sharesAmount_) internal returns (uint256) {
        if (sharesAmount_ == 0) revert ErrorZeroSharesWrap();
        TOKEN_TO_WRAP_FROM.safeTransferFrom(from_, address(this), sharesAmount_);
        _mintShares(to_, sharesAmount_);
        uint256 tokensAmount = _getTokensByShares(sharesAmount_);
        _emitTransferEvents(address(0), to_, tokensAmount, sharesAmount_);
        return tokensAmount;
    }

    function _unwrap(address account_, uint256 tokenAmount_) internal returns (uint256) {
        if (tokenAmount_ == 0) revert ErrorZeroTokensUnwrap();
        uint256 sharesAmount = _getSharesByTokens(tokenAmount_);
        return _unwrapShares(account_, sharesAmount, tokenAmount_);
    }

    function _unwrapShares(address account_, uint256 sharesAmount_, uint256 tokenAmount_) internal returns (uint256) {
        if (sharesAmount_ == 0) revert ErrorZeroSharesUnwrap();
        _burnShares(account_, sharesAmount_);
        _emitTransferEvents(account_, address(0), tokenAmount_, sharesAmount_);
        TOKEN_TO_WRAP_FROM.safeTransfer(account_, sharesAmount_);
        return sharesAmount_;
    }

    /// @dev validates that account_ is not zero address
    modifier onlyNonZeroAccount(address account_) {
        if (account_ == address(0)) {
            revert ErrorAccountIsZeroAddress();
        }
        _;
    }

    /// @dev Validates that sender of the transaction is the bridge
    modifier onlyBridge() {
        if (msg.sender != L2_ERC20_TOKEN_BRIDGE) {
            revert ErrorNotBridge();
        }
        _;
    }

    /// @notice An executed shares transfer from `sender` to `recipient`.
    /// @dev emitted in pair with an ERC20-defined `Transfer` event.
    event TransferShares(
        address indexed from,
        address indexed to,
        uint256 sharesValue
    );

    error ErrorZeroAddressTokenToWrapFrom();
    error ErrorZeroAddressTokenRateOracle();
    error ErrorZeroAddressL2ERC20TokenBridge();
    error ErrorZeroSharesWrap();
    error ErrorZeroTokensUnwrap();
    error ErrorZeroSharesUnwrap();
    error ErrorTransferToRebasableContract();
    error ErrorNotEnoughBalance();
    error ErrorNotEnoughAllowance();
    error ErrorAccountIsZeroAddress();
    error ErrorNotBridge();
}

// SPDX-FileCopyrightText: 2024 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

/// @author kovalgek
/// @notice Extends the ERC20 functionality that allows to wrap/unwrap token.
interface IERC20Wrapper {

    /// @notice Exchanges wrappable token to wrapper one.
    /// @param wrappableTokenAmount_ amount of wrappable token to wrap.
    /// @return Amount of wrapper token user receives after wrap.
    function wrap(uint256 wrappableTokenAmount_) external returns (uint256);

    /// @notice Exchanges wrapper token to wrappable one.
    /// @param wrapperTokenAmount_ amount of wrapper token to uwrap in exchange for wrappable.
    /// @return Amount of wrappable token user receives after unwrap.
    function unwrap(uint256 wrapperTokenAmount_) external returns (uint256);
}

// SPDX-FileCopyrightText: 2022 Lido <[email protected]>
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.10;

import {UnstructuredStorage} from "../lib/UnstructuredStorage.sol";

/// @dev A copy of Versioned.sol contract from Lido on Ethereum protocol
///      https://github.com/lidofinance/lido-dao/blob/master/contracts/0.8.9/utils/Versioned.sol
contract Versioned {
    using UnstructuredStorage for bytes32;

    event ContractVersionSet(uint256 version);

    error NonZeroContractVersionOnInit();
    error InvalidContractVersionIncrement();
    error UnexpectedContractVersion(uint256 expected, uint256 received);

    /// @dev Storage slot: uint256 version
    /// Version of the initialized contract storage.
    /// The version stored in CONTRACT_VERSION_POSITION equals to:
    /// - 0 right after the deployment, before an initializer is invoked (and only at that moment);
    /// - N after calling initialize(), where N is the initially deployed contract version;
    /// - N after upgrading contract by calling finalizeUpgrade_vN().
    bytes32 internal constant CONTRACT_VERSION_POSITION = keccak256("lido.Versioned.contractVersion");

    uint256 internal constant PETRIFIED_VERSION_MARK = type(uint256).max;

    constructor() {
        // lock version in the implementation's storage to prevent initialization
        CONTRACT_VERSION_POSITION.setStorageUint256(PETRIFIED_VERSION_MARK);
    }

    /// @notice Returns the current contract version.
    function getContractVersion() public view returns (uint256) {
        return CONTRACT_VERSION_POSITION.getStorageUint256();
    }

    function _checkContractVersion(uint256 version) internal view {
        uint256 expectedVersion = getContractVersion();
        if (version != expectedVersion) {
            revert UnexpectedContractVersion(expectedVersion, version);
        }
    }

    /// @dev Sets the contract version to N. Should be called from the initialize() function.
    function _initializeContractVersionTo(uint256 version) internal {
        if (getContractVersion() != 0) revert NonZeroContractVersionOnInit();
        _setContractVersion(version);
    }

    /// @dev Updates the contract version. Should be called from a finalizeUpgrade_vN() function.
    function _updateContractVersion(uint256 newVersion) internal {
        if (newVersion != getContractVersion() + 1) revert InvalidContractVersionIncrement();
        _setContractVersion(newVersion);
    }

    function _setContractVersion(uint256 version) private {
        CONTRACT_VERSION_POSITION.setStorageUint256(version);
        emit ContractVersionSet(version);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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me":"WithdrawalsDisabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"enabler","type":"address"}],"name":"WithdrawalsEnabled","type":"event"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEPOSITS_DISABLER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEPOSITS_ENABLER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"L1_TOKEN_NON_REBASABLE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"L1_TOKEN_REBASABLE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"L2_TOKEN_NON_REBASABLE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"L2_TOKEN_REBASABLE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MESSENGER","outputs":[{"internalType":"contract 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0000000000000000000000004200000000000000000000000000000000000007000000000000000000000000755610f5be536ad7afbaa7c10f3e938ea3aa18770000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0000000000000000000000000ae7ab96520de3a18e5e111b5eaab095312d7fe84000000000000000000000000c02fe7317d4eb8753a02c35fe019786854a9200100000000000000000000000081f2508aac59757ef7425ddc9717ab5c2aa0a84f

-----Decoded View---------------
Arg [0] : messenger_ (address): 0x4200000000000000000000000000000000000007
Arg [1] : l1TokenBridge_ (address): 0x755610f5Be536Ad7afBAa7c10F3E938Ea3aa1877
Arg [2] : l1TokenNonRebasable_ (address): 0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
Arg [3] : l1TokenRebasable_ (address): 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
Arg [4] : l2TokenNonRebasable_ (address): 0xc02fE7317D4eb8753a02c35fe019786854A92001
Arg [5] : l2TokenRebasable_ (address): 0x81f2508AAC59757EF7425DDc9717AB5c2AA0A84F

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000004200000000000000000000000000000000000007
Arg [1] : 000000000000000000000000755610f5be536ad7afbaa7c10f3e938ea3aa1877
Arg [2] : 0000000000000000000000007f39c581f595b53c5cb19bd0b3f8da6c935e2ca0
Arg [3] : 000000000000000000000000ae7ab96520de3a18e5e111b5eaab095312d7fe84
Arg [4] : 000000000000000000000000c02fe7317d4eb8753a02c35fe019786854a92001
Arg [5] : 00000000000000000000000081f2508aac59757ef7425ddc9717ab5c2aa0a84f