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// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// =========================== Frax Staker ============================
// ====================================================================

import { OwnedUpgradeable } from "../Flox/OwnedUpgradeable.sol";
import { FraxStakerStructs } from "./interfaces/FraxStakerStructs.sol";
import { ReentrancyGuardUpgradeable } from "@openzeppelin/contracts-upgradeable-5/utils/ReentrancyGuardUpgradeable.sol";

/**
 * @title FraxStaker
 * @author Frax Finance
 * @notice A smart contract that allows users to stake FRAX.
 * @dev Delegating one's stake doesn't transfer the balance to the delegatee, so the full deposit can be retrieved by
 *  the staker.
 * @dev This smart contract supports single-hop fractional delegation. This means that a staker can delegate their stake,
 *  but the delegatee cannot further delegate the accumulated delegations. Fractional delegation means that a
 *  staker can delegate a part of their stake to multiple delegatees.
 * @dev If they want to delegate their stake, they can only do so when they don't have an active stake.
 * @dev When the user initiates the withdrawal, their balance should start reporting as 0 (or their delegation shoud be
 *  revoked). They can only withdraw their FRAX after the cooldown period passes.
 * @dev User can't have a stake for themselves as well as a delegated stake at the same time.
 * @dev We are able to freeze, unfreeze, slash, and blacklist users. Frozen stakers should have a balance of 0 and
 *  blacklisted stakers should be ejected and shouldn't be able to stake again.
 * @dev May be used for validators in the future.
 * @dev Frax Reviewer(s) / Contributor(s)
 *  Jan Turk: https://github.com/ThunderDeliverer
 *  Travis Moore: https://github.com/FortisFortuna
 *  Sam Kazemian: https://github.com/samkazemian
 *  Dennis Denett: https://github.com/denett
 *  Carter Carlson: https://github.com/pegahcarter
 */
contract FraxStaker is OwnedUpgradeable, FraxStakerStructs, ReentrancyGuardUpgradeable {
    /// @notice Address that is the recipient of slashed stakes.
    address public SLASHING_RECIPIENT;

    /**
     * @notice Used to track the blacklisted stakers.
     * @dev staker Address of the staker.
     * @dev isBlacklisted True if the address is blacklisted.
     */
    mapping(address staker => bool isBlacklisted) public blacklist;
    /**
     * @notice Used to keep track of the frozen stakers.
     * @dev address Address of the staker.
     * @dev isFrozen Whether the staker's stake is frozen or not.
     */
    mapping(address staker => bool isFrozen) public isFrozenStaker;
    /**
     * @notice Used to track the Frax contributors.
     * @dev contributor Address of the Frax contributor.
     * @dev isContributor True if the address is a Frax contributor.
     */
    mapping(address contributor => bool isContributor) public isFraxContributor;
    /**
     * @notice Used to track the Frax sentinels.
     * @dev Frax sentinels are addresses that can freeze, unfreeze, slash, and blacklist stakers.
     * @dev sentinel Address of the sentinel.
     * @dev isSentinel True if the address is a sentinel.
     */
    mapping(address sentinel => bool isSentinel) public isFraxSentinel;
    /**
     * @notice Used to track the stakes of each user.
     * @dev staker Address of the staker.
     * @dev stake Stake of the user.
     */
    mapping(address staker => Stake stake) public stakes;

    /// @notice The cooldown required before a staker can withdraw their stake.
    uint256 public withdrawalCooldown;

    /// @notice Version of this smart contract.
    string public version;

    /// @notice Variable to track if the contract is paused.
    bool public isPaused;

    /// @notice Used to make sure the contract is initialized only once.
    bool private _initialized;

    /// @dev reserve extra storage for future upgrades
    uint256[50] private __gap;

    /**
     * @notice The constructor disables the direct use of the implementation smart contract.
     */
    constructor() {
        __Owned_init(address(this));
        _initialized = true;
    }

    /**
     * @notice Used to initialize the smart contract.
     * @dev The initial owner is set as the deployer of the smart contract.
     * @dev The initial withdrawal cooldown is set for 90 days.
     * @dev The initial slashing recipient update delay is set for 7 days.
     * @param _owner Address of the owner of the smart contract
     * @param _version Version of this smart contract
     */
    function initialize(address _owner, string memory _version) public initializer {
        if (_initialized) revert AlreadyInitialized();

        _initialized = true;
        SLASHING_RECIPIENT = address(0xdead);
        version = _version;

        withdrawalCooldown = 90 days;

        __Owned_init(_owner);
        __ReentrancyGuard_init();
    }

    /**
     * @notice Returns the balance of the specified address.
     * @dev The balance is zero if the address is blacklisted, frozen, or has initiated a withdrawal.
     * @dev This is a sum of the staker's stake and the amount delegated to them, minus the amount they have delegated
     *  to others.
     * @dev Even if the user's balance is negated due to the user having initiated a withdrawal, the user can still
     *  receive the delegated balance.
     * @param account Address to check the balance of
     * @return The balance of the specified address
     */
    function balanceOf(address account) public view returns (uint256) {
        Stake memory stake = stakes[account];
        uint256 userBalance;

        if (blacklist[account] || isFrozenStaker[account]) {
            return 0;
        } else if (stake.initiatedWithdrawal) {
            userBalance = 0;
        } else {
            userBalance = stake.amountStaked - stake.amountDelegated;
        }

        return (userBalance + stake.amountDelegatedToStaker);
    }

    /**
     * @notice Returns the total supply of FRAX staked in the contract.
     * @return The total supply of FRAX staked in the contract
     */
    function totalSupply() public view returns (uint256) {
        return address(this).balance;
    }

    /**
     * @notice Stakes FRAX for the caller.
     * @dev Reverts if the contract is paused.
     * @dev Reverts if the caller's stake is frozen.
     * @dev Reverts if the caller is blacklisted.
     * @dev The amount of FRAX to stake is the value sent with the transaction.
     * @dev If the caller delegates their stake, this will increase the delegated stake instead of creating a separate
     *  stake for them.
     */
    function stakeFrax() public payable {
        _onlyWhenOperational();
        _onlyWhenNotFrozen(msg.sender);
        _onlyWhenNotBlacklisted(msg.sender);

        _stake(msg.value, msg.sender);

        Stake memory stake = stakes[msg.sender];
        if (stake.delegatee != address(0)) {
            _onlyWhenNotFrozen(stake.delegatee);
            _onlyWhenNotBlacklisted(stake.delegatee);

            _delegate(msg.sender, stake.delegatee, msg.value);
        }
    }

    /**
     * @notice Used to donate your FRAX to the recipient's stake.
     * @dev Reverts if the contract is paused.
     * @dev Reverts if the recipient is frozen or blacklisted.
     * @dev Reverts if there is no FRAX sent with the transaction.
     * @dev Reverts if the recipient has initiated a withdrawal.
     * @dev This can only be executed when the recipient has an active stake. This constraint is to ensure that the
     *  recipient can delegate their stake if they want to do so and that the ability to delegate is not disabled for
     *  the user that received the donation.
     * @param recipient Address of the recipient to donate the stake to
     */
    function donateStake(address recipient) external payable {
        _onlyWhenOperational();
        _onlyWhenNotFrozen(recipient);
        _onlyWhenNotBlacklisted(recipient);

        if (msg.value == 0) revert InvalidStakeAmount();

        Stake storage recipientStake = stakes[recipient];
        if (recipientStake.initiatedWithdrawal) revert WithdrawalInitiated();
        if (recipientStake.amountStaked == 0) revert InvalidStakeAmount();

        _stake(msg.value, recipient);

        if (recipientStake.delegatee != address(0)) {
            _onlyWhenNotFrozen(recipientStake.delegatee);
            _onlyWhenNotBlacklisted(recipientStake.delegatee);

            _delegate(recipient, recipientStake.delegatee, msg.value);
        }

        emit StakeDonation(msg.sender, recipient, msg.value);
    }

    /**
     * @notice Stakes the caller's FRAX, then delegates to someone else (delegatee). Note they are not adding to the
     *  delegatee's own position, if any.
     * @dev Reverts if the contract is paused.
     * @dev Reverts if the staker's stake is frozen.
     * @dev Reverts if the delegatee's stake is frozen.
     * @dev Reverts if the staker is blacklisted.
     * @dev Reverts if the delegatee is blacklisted.
     * @dev The amount of FRAX to stake is the value sent with the transaction.
     * @dev This overloaded function allows the staker to delegate their stake to another staker.
     * @dev If another delegation exists for the staker, this function will revert. They should remove that delegation first
     * @param _delegatee Address of the delegatee
     */
    function stakeFrax(address _delegatee) external payable {
        _onlyWhenOperational();
        _onlyWhenNotFrozen(msg.sender);
        _onlyWhenNotFrozen(_delegatee);
        _onlyWhenNotBlacklisted(msg.sender);
        _onlyWhenNotBlacklisted(_delegatee);

        // Make sure that the staker doesn't have a non-delegated stake
        if (stakes[msg.sender].amountStaked != stakes[msg.sender].amountDelegated) {
            revert NonDelegatedStakeAlreadyExists();
        }

        _stake(msg.value, msg.sender);
        _delegate(msg.sender, _delegatee, msg.value);
    }

    /**
     * @notice Initiates the withdrawal of the caller's stake.
     * @dev Reverts if the contract is paused.
     * @dev Reverts if the caller's stake is frozen.
     * @dev Reverts if the caller is blacklisted.
     */
    function initiateWithdrawal() external {
        _onlyWhenOperational();
        _onlyWhenNotFrozen(msg.sender);
        _onlyWhenNotBlacklisted(msg.sender);

        _revokeDelegation(msg.sender);
        _initiateWithdrawal(msg.sender);
    }

    /**
     * @notice Withdraws the staker's stake.
     * @dev Reverts if the contract is paused.
     * @dev Reverts if the staker's stake is frozen.
     * @dev This operation will revoke all delegations of the staker's stake. This is only done in this stepto ensure
     *  the delegations can't be instantly revoked.
     * @dev Blacklisted stakers can withdraw their remaining stake.
     */
    function withdrawStake() external nonReentrant {
        _onlyWhenOperational();
        _onlyWhenNotFrozen(msg.sender);

        _withdrawStake(msg.sender);
    }

    /**
     * @notice Allows a Frax contributor to force the withdrawal of staker's stake.
     * @dev This can only be called by a Frax contributor and is used to exit stakes that have passed the withdrawal
     *  cooldown period.
     * @dev Reverts if the staker's stake is frozen.
     * @dev This revokes the full amount of the delegated stake.
     * @param _staker Address of the staker to force withdraw
     */
    function forceStakeWithdrawal(address _staker) external nonReentrant {
        _onlyFraxContributor();
        _onlyWhenNotFrozen(_staker);

        _withdrawStake(_staker);
    }

    /**
     * @notice Adds a Frax contributor.
     * @dev Can only be called by the owner.
     * @param _contributor The address of the Frax contributor to add
     */
    function addFraxContributor(address _contributor) external {
        _onlyOwner();
        if (isFraxContributor[_contributor]) revert AlreadyFraxContributor();
        isFraxContributor[_contributor] = true;
        emit FraxContributorAdded(_contributor);
    }

    /**
     * @notice Removes a Frax contributor.
     * @dev Can only be called by the owner.
     * @param _contributor The address of the Frax contributor to remove
     */
    function removeFraxContributor(address _contributor) external {
        _onlyOwner();
        if (!isFraxContributor[_contributor]) revert NotFraxContributor();
        isFraxContributor[_contributor] = false;
        emit FraxContributorRemoved(_contributor);
    }

    /**
     * @notice Adds a Frax sentinel.
     * @dev Can only be called by the owner.
     * @param _sentinel The address of the Frax sentinel to add
     */
    function addFraxSentinel(address _sentinel) external {
        _onlyOwner();
        if (isFraxSentinel[_sentinel]) revert AlreadyFraxSentinel();
        isFraxSentinel[_sentinel] = true;
        emit FraxSentinelAdded(_sentinel);
    }

    /**
     * @notice Removes a Frax sentinel.
     * @dev Can only be called by the owner.
     * @param _sentinel The address of the Frax sentinel to remove
     */
    function removeFraxSentinel(address _sentinel) external {
        _onlyOwner();
        if (!isFraxSentinel[_sentinel]) revert NotFraxSentinel();
        isFraxSentinel[_sentinel] = false;
        emit FraxSentinelRemoved(_sentinel);
    }

    /**
     * @notice Updates the withdrawal cooldown duration.
     * @dev Can only be called by the owner.
     * @param _withdrawalCooldown The new withdrawal cooldown
     */
    function updateWithdrawalCooldown(uint256 _withdrawalCooldown) external {
        _onlyOwner();
        uint256 oldWithdrawalCooldown = withdrawalCooldown;
        withdrawalCooldown = _withdrawalCooldown;
        emit WithdrawalCooldownUpdated(oldWithdrawalCooldown, withdrawalCooldown);
    }

    /**
     * @notice Stops the operation of the smart contract.
     * @dev Can only be called by a Frax contributor.
     * @dev Can only be called if the contract is operational.
     */
    function stopOperation() external {
        _onlyFraxContributor();
        if (isPaused) revert ContractPaused();
        isPaused = true;
        emit OperationPaused(isPaused, block.timestamp);
    }

    /**
     * @notice Enables the operation of the smart contract.
     * @dev Can only be called by the owner.
     * @dev Can only be called if the contract is paused.
     */
    function restartOperation() external {
        _onlyOwner();
        if (!isPaused) revert ContractOperational();
        isPaused = false;
        emit OperationPaused(isPaused, block.timestamp);
    }

    /**
     * @notice Updates the slashing recipient address.
     * @dev Can only be called by the owner.
     * @dev The new slashing recipient cannot be the same as the old one.
     * @dev If the same address is passed, the operation will revert. This is to prevent passing a similar spoofed
     *  address to the function.
     * @param _slashingRecipient Address of the new slashing recipient
     */
    function updateSlashingRecipient(address _slashingRecipient) external {
        _onlyOwner();

        address currentSlashingRecipient = SLASHING_RECIPIENT;
        if (currentSlashingRecipient == _slashingRecipient) revert AlreadySlashingRecipient();

        SLASHING_RECIPIENT = _slashingRecipient;

        emit SlashingRecipientUpdated(currentSlashingRecipient, _slashingRecipient);
    }

    /**
     * @notice Slashes the staker's stake by the specified amount.
     * @dev Can only be called by the Frax sentinel.
     * @dev The user should be able to be slashed even if their stake is frozen.
     * @param _staker The address of the slashing recipient
     * @param _amount The amount of FRAX to slash
     */
    function slashStaker(address _staker, uint256 _amount) external nonReentrant {
        _onlyFraxSentinel();

        _slash(_staker, _amount);
    }

    /**
     * @notice Freezes the staker's stake.
     * @dev Can only be called by the Frax sentinel.
     * @dev The freezing operation will be reverted if the contract is paused.
     * @param _staker The address of the staker to freeze
     */
    function freezeStaker(address _staker) external {
        _onlyFraxSentinel();

        _freezeStaker(_staker);
    }

    /**
     * @notice Unfreezes the staker's stake.
     * @dev Can only be called by the Frax sentinel.
     * @dev The unfreezing operation will be reverted if the contract is paused.
     * @param _staker The address of the staker to unfreeze
     */
    function unfreezeStaker(address _staker) external {
        _onlyFraxSentinel();

        _unfreezeStaker(_staker);
    }

    /**
     * @notice Blacklists the staker.
     * @dev Can only be called by the Frax sentinel.
     * @param _staker The address of the staker to blacklist
     */
    function blacklistStaker(address _staker) external {
        _onlyFraxSentinel();

        _blacklistStaker(_staker);
    }

    /**
     * @notice Checks if an address is a Frax contributor.
     * @dev Reverts if the caller is not a Frax contributor.
     */
    function _onlyFraxContributor() internal view {
        if (!isFraxContributor[msg.sender]) revert NotFraxContributor();
    }

    /**
     * @notice Checks if an address is a Frax sentinel.
     * @dev Reverts if the caller is not a Frax sentinel.
     */
    function _onlyFraxSentinel() internal view {
        if (!isFraxSentinel[msg.sender]) revert NotFraxSentinel();
    }

    /**
     * @notice Checks if the contract is operational.
     * @dev Reverts if the contract is paused.
     */
    function _onlyWhenOperational() internal view {
        if (isPaused) revert ContractPaused();
    }

    /**
     * @notice Checks if the staker's stake is frozen.
     * @dev Reverts if the staker's stake is frozen.
     * @param _staker Address of the staker to check
     */
    function _onlyWhenNotFrozen(address _staker) internal view {
        if (isFrozenStaker[_staker]) revert FrozenStaker();
    }

    /**
     * @notice Checks if the staker is blacklisted.
     * @dev Reverts if the staker is blacklisted.
     * @param _staker Address of the staker to check
     */
    function _onlyWhenNotBlacklisted(address _staker) internal view {
        if (blacklist[_staker]) revert BlacklistedStaker();
    }

    /**
     * @notice Stakes FRAX for the caller.
     * @dev Since the amount to stake is the message value, we don't need to validate the user's balance.
     * @dev Attempting to stake zero FRAX will result in reverted execution.
     * @param _amount Amount of FRAX to stake
     * @param _staker Address of the staker
     */
    function _stake(uint256 _amount, address _staker) internal {
        if (_amount == 0) revert InvalidStakeAmount();

        Stake storage stake = stakes[_staker];
        if (stake.initiatedWithdrawal) revert WithdrawalInitiated();
        uint256 initialStake = stake.amountStaked;
        stake.amountStaked += _amount;

        emit StakeUpdated(_staker, initialStake, stake.amountStaked);
    }

    /**
     * @notice Initiates the withdrawal of the staker's stake.
     * @dev Reverts if the staker has no stake.
     * @dev Reverts if the staker has already initiated a withdrawal.
     * @param _staker Address of the staker
     */
    function _initiateWithdrawal(address _staker) internal {
        Stake storage stake = stakes[_staker];

        if (stake.amountStaked == 0) revert InvalidStakeAmount();
        if (stake.initiatedWithdrawal) revert WithdrawalInitiated();

        stake.initiatedWithdrawal = true;
        stake.unlockTime = block.timestamp + withdrawalCooldown;

        emit StakeWithdrawalInitiated(_staker, stake.amountStaked, stake.unlockTime);
    }

    /**
     * @notice Withdraws the staker's stake.
     * @dev Reverts if the staker has not initiated a withdrawal.
     * @dev Reverts if the staker's stake is not available to be withdrawn yet.
     * @param _staker Address of the staker
     */
    function _withdrawStake(address _staker) internal {
        Stake storage stake = stakes[_staker];

        if (!stake.initiatedWithdrawal) revert WithdrawalNotInitiated();
        if (block.timestamp < stake.unlockTime) revert WithdrawalNotAvailable();

        uint256 amount = stake.amountStaked;
        stake.amountStaked = 0;
        stake.initiatedWithdrawal = false;
        stake.unlockTime = 0;

        (bool success, ) = _staker.call{ value: amount }("");
        if (!success) revert TransferFailed();

        emit StakeUpdated(_staker, amount, 0);
    }

    /**
     * @notice Delegates a part of the staker's stake to another staker.
     * @dev Reverts if the staker wants to delegate more FRAX than available.
     * @dev Reverts if the staker has already delegated to amother delegatee.
     * @param _staker Address of the staker
     * @param _delegatee Address of the delegatee
     * @param _amount Amount of FRAX to delegate
     */
    function _delegate(address _staker, address _delegatee, uint256 _amount) internal {
        if (_staker == _delegatee) revert CannotDelegateToSelf();
        if (_delegatee == address(0)) revert InvalidDelegatee();

        Stake storage stakerStake = stakes[_staker];

        if (_amount > (stakerStake.amountStaked - stakerStake.amountDelegated)) revert InvalidStakeAmount();

        if (stakerStake.delegatee != address(0) && stakerStake.delegatee != _delegatee) {
            revert AlreadyDelegatedToAnotherDelegatee();
        }

        stakerStake.amountDelegated += _amount;
        stakerStake.delegatee = _delegatee;
        stakes[_delegatee].amountDelegatedToStaker += _amount;

        emit StakeDelegated(_staker, _delegatee, _amount);
    }

    /**
     * @notice Revokes staker's delegation.
     * @dev This revokes the full amount of the delegated stake.
     * @param _staker Address of the staker
     */
    function _revokeDelegation(address _staker) internal {
        Stake storage stake = stakes[_staker];

        address delegatee = stake.delegatee;

        uint256 amount = stake.amountDelegated;

        if (amount > 0) {
            stake.amountDelegated = 0;
            stakes[delegatee].amountDelegatedToStaker -= amount;

            stake.delegatee = address(0);

            emit StakeDelegationRevoked(_staker, delegatee, amount);
        }
    }

    /**
     * @notice Slashes the staker's stake.
     * @dev If the staker's stake is less than the amount to be slashed, the entire stake will be slashed.
     * @param _staker Address of the staker to slash
     * @param _amount The amount of FRAX to slash
     */
    function _slash(address _staker, uint256 _amount) internal {
        Stake storage stake = stakes[_staker];

        _amount = stake.amountStaked < _amount ? stake.amountStaked : _amount;

        stake.amountStaked -= _amount;

        if (stake.delegatee != address(0)) {
            // Only reduce the amount delegated to the staker if they are not frozen, otherwise the delegated stake is temporarily nullified already
            if (!isFrozenStaker[_staker]) {
                stakes[stake.delegatee].amountDelegatedToStaker -= _amount;
            }
            stake.amountDelegated -= _amount;
        }

        (bool success, ) = SLASHING_RECIPIENT.call{ value: _amount }("");
        if (!success) revert TransferFailed();

        emit Slashed(_staker, _amount);
    }

    /**
     * @notice Freezes the staker's stake.
     * @dev This is reversible and should be used when investigating a staker.
     * @dev Reverts if the staker's stake is already frozen.
     * @dev If the staker delegated their stake, freezing their stake will temporarily remove the delegated stake.
     * @param _staker Address of the staker to freeze
     */
    function _freezeStaker(address _staker) internal {
        if (isFrozenStaker[_staker]) revert AlreadyFrozenStaker();

        isFrozenStaker[_staker] = true;

        if (stakes[_staker].delegatee != address(0)) {
            stakes[stakes[_staker].delegatee].amountDelegatedToStaker -= stakes[_staker].amountStaked;
        }

        emit StakerFrozen(_staker, stakes[_staker].amountStaked);
    }

    /**
     * @notice Unfreezes the staker's stake.
     * @dev Reverts if the staker's stake is not frozen.
     * @param _staker Address of the staker to unfreeze
     */
    function _unfreezeStaker(address _staker) internal {
        if (!isFrozenStaker[_staker]) revert NotFrozenStaker();

        isFrozenStaker[_staker] = false;

        if (stakes[_staker].delegatee != address(0)) {
            stakes[stakes[_staker].delegatee].amountDelegatedToStaker += stakes[_staker].amountStaked;
        }

        emit StakerUnfrozen(_staker, stakes[_staker].amountStaked);
    }

    /**
     * @notice Blacklists the staker.
     * @dev This is irreversible and should be used when a staker is found to be malicious.
     * @dev If the staker should be slashed, slashing should be done before blacklisting.
     * @dev This forces the staker to withdraw their stake and prevents them from staking again.
     * @dev Reverts if the staker is already blacklisted.
     * @param _staker Address of the staker to blacklist
     */
    function _blacklistStaker(address _staker) internal {
        if (blacklist[_staker]) revert AlreadyBlacklistedStaker();

        if (isFrozenStaker[_staker]) {
            _unfreezeStaker(_staker);
        }

        blacklist[_staker] = true;

        if (stakes[_staker].amountStaked > 0) {
            _initiateWithdrawal(_staker);
        }
        _revokeDelegation(_staker);

        emit StakerBlacklisted(_staker, stakes[_staker].amountStaked);
    }

    /* ====================== EMERGENCIES AND FALLBACKS ====================== */
    /**
     * @notice Fallback function to receive FRAX and automatically stake sent funds for the sender.
     * @dev This simplifies recovery process of accidentally sent FRAX to the staking smart contract. It allows users to
     *  retrieve their accidentally sent FRAX by following the withdrawal process.
     */
    receive() external payable {
        stakeFrax();
    }

    /**
     * @notice Receives FRAX to increase the smart contract balance and does nothing else.
     */
    function donate() external payable {
        // Just accept FRAX and do nothing
    }

    /**
     * @notice Allows the owner to recover FRAX from the smart contract in case it somehow gets stuck.
     * @dev This function can only be called by the owner.
     * @dev The specified amount of FRAX will be transferred to the caller's (owner's) address.
     * @param _amount The amount of FRAX to recover
     */
    function recoverFrax(uint256 _amount) external nonReentrant {
        _onlyOwner();

        (bool success, ) = address(owner).call{ value: _amount }("");
        if (!success) revert TransferFailed();

        emit RecoveredFrax(_amount);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================= OwnedUpgradeable ===========================
// ====================================================================

/**
 * @title OwnedUpgradeable
 * @author Frax Finance
 * @notice The OwnedUpgradeable contract has an owner address, and provides basic access control.
 */
contract OwnedUpgradeable {
    /// Emitted when attempting to initialize an already initialized contract.
    error OwnedAlreadyInitialized();
    /// Emitted when attempting to accept ownership when the caller is not the nominated owner.
    error InvalidOwnershipAcceptance();
    /// Emitted when the owner address is set to the zero address.
    error OwnerCannotBeZeroAddress();
    /// Emitted when the caller is not the owner.
    error OnlyOwner();

    /// Address of the owner of the smart contract.
    address public owner;
    /// Address of the nominated owner of the smart contract.
    address public nominatedOwner;
    /// Used to make sure the contract is initialized only once.
    bool private _initialized;

    /**
     * @notice Used to initialize the smart contract.
     * @param _owner The address of the owner
     */
    function __Owned_init(address _owner) public {
        if (_initialized) revert OwnedAlreadyInitialized();
        if (_owner == address(0)) revert OwnerCannotBeZeroAddress();

        _initialized = true;
        owner = _owner;

        emit OwnerChanged(address(0), _owner);
    }

    /**
     * @notice Allows the current owner to nominate a new owner.
     * @dev Reverts if the caller is not the current owner.
     * @dev Reverts if the nominated owner is the zero address.
     * @param _owner The address of the new owner
     */
    function nominateNewOwner(address _owner) external {
        _onlyOwner();

        if (_owner == address(0)) revert OwnerCannotBeZeroAddress();
        nominatedOwner = _owner;

        emit OwnerNominated(_owner);
    }

    /**
     * @notice Allows the current nominated owner to accept the ownership.
     * @dev Reverts if the caller is not the nominated owner.
     */
    function acceptOwnership() external {
        if (msg.sender != nominatedOwner) revert InvalidOwnershipAcceptance();

        address oldOwner = owner;
        owner = nominatedOwner;
        nominatedOwner = address(0);

        emit OwnerChanged(oldOwner, owner);
    }

    /**
     * @notice Restricts access to the function to the owner.
     * @dev Reverts if the caller is not the owner.
     */
    function _onlyOwner() internal view {
        if (msg.sender != owner) revert OnlyOwner();
    }

    /**
     * @notice Emitted when a new owner is nominated.
     * @param nominatedOwner The address of the nominated owner
     */
    event OwnerNominated(address indexed nominatedOwner);
    /**
     * @notice Emitted when the ownership is transferred.
     * @param previousOwner Address of the previous owner
     * @param newOwner Address of the new owner
     */
    event OwnerChanged(address indexed previousOwner, address indexed newOwner);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================= IFrax Staker Structs =======================
// ====================================================================

import { IFraxStakerErrors } from "./IFraxStakerErrors.sol";
import { IFraxStakerEvents } from "./IFraxStakerEvents.sol";

/**
 * @title IFraxStakerStructs
 * @author Frax Finance
 * @notice A collection of structs used by the FraxStaker system.
 */
contract FraxStakerStructs is IFraxStakerErrors, IFraxStakerEvents {
    /**
     * @notice A struct used to represent the stake of a user.
     * @dev The `unlockTime` is set to 0 if the stake is not slated for withdrawal.
     * @param amountStaked The amount of FRAX staked
     * @param amountDelegated The amount of FRAX delegated to other stakers
     * @param amountDelegatedToStaker The amount of FRAX delegated to this staker
     * @param unlockTime The time at which the stake can be withdrawn
     * @param delegatee The delegatee address of the staker
     * @param initiatedWithdrawal True if the stake withdrawal has been initiated
     * @param __gap Reserved 10 storage slots for future upgrades
     */
    struct Stake {
        uint256 amountStaked;
        uint256 amountDelegated;
        uint256 amountDelegatedToStaker;
        uint256 unlockTime;
        address delegatee;
        bool initiatedWithdrawal;
        uint256[10] __gap; // reserve extra storage for future upgrades
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    /// @custom:storage-location erc7201:openzeppelin.storage.ReentrancyGuard
    struct ReentrancyGuardStorage {
        uint256 _status;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant ReentrancyGuardStorageLocation = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;

    function _getReentrancyGuardStorage() private pure returns (ReentrancyGuardStorage storage $) {
        assembly {
            $.slot := ReentrancyGuardStorageLocation
        }
    }

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        $._status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if ($._status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        $._status = ENTERED;
    }

    function _nonReentrantAfter() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        $._status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        return $._status == ENTERED;
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ==================== IFrax Staker Errors ========================
// ====================================================================

/**
 * @title IFraxStakerErrors
 * @author Frax Finance
 * @notice A collection of errors used by the FraxStaker system.
 */
interface IFraxStakerErrors {
    /// Emitted when the staker is already blacklisted.
    error AlreadyBlacklistedStaker();

    /// Emitted when attempting to delegate to someone when you already have an active delegation.
    error AlreadyDelegatedToAnotherDelegatee();

    /// Emitted when the owner tries to add a Frax contributor that is already a Frax contributor.
    error AlreadyFraxContributor();

    /// Emitted when the owner tries to add a Frax sentinel that is already a Frax sentinel.
    error AlreadyFraxSentinel();

    /// Emitted when the staker is aleady frozen.
    error AlreadyFrozenStaker();

    /// Emitted when the contract is already initialized.
    error AlreadyInitialized();

    /// Emitted when the supplied address is already the slashing recipient.
    error AlreadySlashingRecipient();

    /// Emitted when the staker is blacklisted.
    error BlacklistedStaker();

    /// Emitted when attempting to delegate to self.
    error CannotDelegateToSelf();

    /// Emitted when the contract is operational and the action that requires it to be paused is attempted.
    error ContractOperational();

    /// Emitted when the contract is paused and the action that requires it to be operational is attempted.
    error ContractPaused();

    /// Emitted when the staker is frozen and can't perform any actions.
    error FrozenStaker();

    /// Emitted when attempting to delegate to an address that is not a valid delegatee.
    error InvalidDelegatee();

    /// Emitted when attempting to create a stake with a zero amount.
    error InvalidStakeAmount();

    /// Emitted when the staker tries to delegate their stake when they already have an active non-delegated stake to someone else.
    error NonDelegatedStakeAlreadyExists();

    /// Emitted when the owner tries to remove a Frax contributor that is not a Frax contributor.
    error NotFraxContributor();

    /// Emitted when the owner tries to remove a Frax sentinel that is not a Frax sentinel.
    error NotFraxSentinel();

    /// Emitted when the staker is not frozen.
    error NotFrozenStaker();

    /// Emitted when the sender is not a flox contributor.
    error NotFloxContributor();

    /// Emitted when the FRAX transfer fails.
    error TransferFailed();

    /// Emitted when a user tries to deposit FRAX while they aleady have a stake with initiated withdrawal.
    /// They need to either cancel the withdrawal or wait for it to finish.
    error WithdrawalInitiated();

    /// Emitted when a user tries to withdraw their stake but it is not available to be withdrawn yet.
    error WithdrawalNotAvailable();

    /// Emitted when a user tries to withdraw their stake but the withdrawal has not been initiated yet.
    error WithdrawalNotInitiated();
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

/**
 * ====================================================================
 * |     ______                   _______                             |
 * |    / _____________ __  __   / ____(_____  ____ _____  ________   |
 * |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
 * |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
 * | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
 * |                                                                  |
 * ====================================================================
 * ===================== IFraxStakerEvents =========================
 * ====================================================================
 * Frax Finance: https://github.com/FraxFinance
 */

/**
 * @title IFraxStakerEvents
 * @author Frax Finance
 * @notice A collection of events used by the FraxStaker system.
 */
contract IFraxStakerEvents {
    /**
     * @notice Emitted when a contributor is added.
     * @param contributor The address of the contributor
     */
    event FraxContributorAdded(address indexed contributor);
    /**
     * @notice Emitted when a contributor is removed.
     * @param contributor The address of the contributor
     */
    event FraxContributorRemoved(address indexed contributor);
    /**
     * @notice Emitted when a sentinel is added.
     * @param sentinel The address of the sentinel
     */
    event FraxSentinelAdded(address indexed sentinel);
    /**
     * @notice Emitted when a sentinel is removed.
     * @param sentinel The address of the sentinel
     */
    event FraxSentinelRemoved(address indexed sentinel);
    /**
     * @notice Emitted when a new admin is proposed.
     * @param currentAdmin The address of the current admin
     * @param proposedFutureAdmin The address of the proposed future admin
     */
    event FutureAdminProposed(address indexed currentAdmin, address indexed proposedFutureAdmin);
    /**
     * @notice Emitted when a new admin is set.
     * @param oldAdmin The address of the old admin
     * @param newAdmin The address of the new admin
     */
    event NewAdmin(address indexed oldAdmin, address indexed newAdmin);
    /**
     * @notice Emitted when the contract is paused or unpaused.
     * @param paused True if the contract is paused, false if it is unpaused
     * @param timestamp The timestamp at which the pause or unpause occurred
     */
    event OperationPaused(bool paused, uint256 timestamp);
    /**
     * @notice Emitted when FRAX is recovered from the smart contract.
     * @param amount The amount of FRAX recovered
     */
    event RecoveredFrax(uint256 amount);
    /**
     * @notice Emitted when a stake is slashed.
     * @param staker The address of the staker
     * @param amount The amount of FRAX slashed
     */
    event Slashed(address indexed staker, uint256 amount);
    /**
     * @notice Emitted when the slashing recipient is updated.
     * @dev The slashing recipient is the address that receives the slashed FRAX.
     * @param oldSlashingRecipient Previous slashing recipient
     * @param newSlashingRecipient Updated slashing recipient
     */
    event SlashingRecipientUpdated(address indexed oldSlashingRecipient, address indexed newSlashingRecipient);
    /**
     * @notice Emitted when a stake is delegated.
     * @param staker Address of the staker
     * @param delegatee Address of the delegatee
     * @param amount Amount of FRAX delegated
     */
    event StakeDelegated(address indexed staker, address indexed delegatee, uint256 amount);
    /**
     * @notice Emitted when a stake delegation is revoked.
     * @dev The amount of FRAX in the event equals the amount of FRAX delegated to this specific delegatee by this
     *  staker.
     * @param staker Address of the staker
     * @param delegatee Address of the delegatee
     * @param amount Amount of FRAX delegation revoked
     */
    event StakeDelegationRevoked(address indexed staker, address indexed delegatee, uint256 amount);
    /**
     * @notice Emitted when an address donates FRAX to another staker's stake.
     * @param donor Address that donated FRAX to the recipient's stake
     * @param recipient Address that received the donated FRAX to their stake
     * @param amount Amount of FRAX that was donated
     */
    event StakeDonation(address indexed donor, address indexed recipient, uint256 amount);
    /**
     * @notice Emitted when a staker is blacklisted.
     * @param staker The address of the blacklisted staker
     * @param amount The amount of FRAX staked
     */
    event StakerBlacklisted(address indexed staker, uint256 amount);
    /**
     * @notice Emitted when a stake is frozen.
     * @param staker The address of the staker
     * @param amount The amount of FRAX staked
     */
    event StakerFrozen(address indexed staker, uint256 amount);
    /**
     * @notice Emitted when a stake is unfrozen.
     * @param staker The address of the staker
     * @param amount The amount of FRAX unfrozen
     */
    event StakerUnfrozen(address indexed staker, uint256 amount);
    /**
     * @notice Emitted when a stake is updated.
     * @param staker The address of the staker
     * @param initialStake The initial amount of FRAX staked
     * @param newStake The new amount of FRAX staked
     */
    event StakeUpdated(address indexed staker, uint256 initialStake, uint256 newStake);
    /**
     * @notice Emitted when a stake withdrawal is initiated.
     * @param staker The address of the staker
     * @param stake The amount of FRAX staked
     * @param withdrawalTimestamp The timestamp at which the withdrawal will be available
     */
    event StakeWithdrawalInitiated(address indexed staker, uint256 stake, uint256 withdrawalTimestamp);
    /**
     * @notice Emitted when the withdrawal cooldown period is updated.
     * @param oldCooldown Previous withdrawal cooldown period
     * @param newCooldown New withdrawal cooldown period
     */
    event WithdrawalCooldownUpdated(uint256 oldCooldown, uint256 newCooldown);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

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    "lib/optimism/packages/contracts-bedrock:@solmate/=lib/optimism/packages/contracts-bedrock/lib/solmate/src/",
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}

• No Contract Security Audit Submitted- Submit Audit Here

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ame":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"recoverFrax","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_contributor","type":"address"}],"name":"removeFraxContributor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_sentinel","type":"address"}],"name":"removeFraxSentinel","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"restartOperation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"slashStaker","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakeFrax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_delegatee","type":"address"}],"name":"stakeFrax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"staker","type":"address"}],"name":"stakes","outputs":[{"internalType":"uint256","name":"amountStaked","type":"uint256"},{"internalType":"uint256","name":"amountDelegated","type":"uint256"},{"internalType":"uint256","name":"amountDelegatedToStaker","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"},{"internalType":"address","name":"delegatee","type":"address"},{"internalType":"bool","name":"initiatedWithdrawal","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stopOperation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"unfreezeStaker","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_slashingRecipient","type":"address"}],"name":"updateSlashingRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_withdrawalCooldown","type":"uint256"}],"name":"updateWithdrawalCooldown","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawalCooldown","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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