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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/proxy/beacon/UpgradeableBeacon.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "./EzRvaultStorage.sol";
import "../Errors/Errors.sol";
import "../EigenLayer/interfaces/IStrategyManager.sol";
import "../EigenLayer/interfaces/IDelegationManager.sol";
import "../EigenLayer/interfaces/IRewardsCoordinator.sol";
import {
    OwnableUpgradeable
} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract EzRVault is
    ERC20Upgradeable,
    OwnableUpgradeable,
    ReentrancyGuardUpgradeable,
    EzRVaultStorageV1
{
    using SafeERC20 for IERC20;

    uint256 public constant BASIS_POINTS = 10000; // BASIS_POINTS used for percentage (10000 basis points equal 100%)
    uint256 public constant SHARE_OFFSET = 1e3;
    uint256 public constant BALANCE_OFFSET = 1e3;

    // EigenLayer configs
    IStrategyManager public immutable strategyManager;
    IDelegationManager public immutable delegationManager;
    IRewardsCoordinator public immutable rewardsCoordinator;
    IERC20 public immutable EIGEN;
    IERC20 public immutable B_EIGEN;

    // Protocol fee on rewards
    uint256 public immutable protocolFee;
    address public immutable protocolTreasury;

    // 7 days in blocks number (60*60*24*7 / 12)
    uint256 public constant SEVEN_DAYS_BLOCKS = 50_400;

    // Max cooldown blocks basis points
    uint256 public immutable maxCooldownBlocksBasisPoints;

    event DelegationAddressUpdated(address delegateAddress);

    event VaultCooldownUpdated(uint256 oldVaultCooldown, uint256 newVaultCooldown);

    event Deposit(address user, uint256 underlyingAmount, uint256 lpMinted);

    event WithdrawStarted(
        bytes32 withdrawRoot,
        address user,
        address staker,
        address delegatedTo,
        address withdrawer,
        uint nonce,
        uint startBlock,
        IStrategy[] strategies,
        uint256[] shares
    );

    event WithdrawRequestClaimed(
        bytes32 withdrawalRoot,
        address user,
        uint256 underlyingClaimAmount,
        IDelegationManager.Withdrawal withdrawal
    );

    event EmergencyWithdrawalTracked(IDelegationManager.Withdrawal withdrawal);
    event EmergencyWithdrawalCompleted(IDelegationManager.Withdrawal withdrawal);
    event IncentiveDeposited(uint256 amount);
    event Paused(bool paused);
    event PauserUpdated(address oldPauser, address newPauser);

    /// @dev Only allows deposit when Delegated
    modifier onlyWhenDelegated() {
        if (delegationManager.delegatedTo(address(this)) == address(0)) revert VaultNotDelegated();
        _;
    }

    /// @dev Only allows deposit and withdraw when not paused
    modifier whenNotPaused() {
        if (paused) revert VaultPaused();
        _;
    }

    /// @dev Only allowed pauser and owner to change pause state
    modifier onlyPauser() {
        if (msg.sender != owner() && msg.sender != pauser) revert NotPauser();
        _;
    }

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(
        IStrategyManager _strategyManager,
        IDelegationManager _delegationManager,
        IRewardsCoordinator _rewardsCoordinator,
        IERC20 _eigen,
        IERC20 _bEigen,
        uint256 _protocolFee,
        address _protocolTreasury,
        uint256 _maxCooldownBlocksBasisPoints
    ) {
        if (
            address(_strategyManager) == address(0) ||
            address(_delegationManager) == address(0) ||
            address(_rewardsCoordinator) == address(0) ||
            address(_eigen) == address(0) ||
            address(_bEigen) == address(0) ||
            _protocolFee == 0 ||
            _protocolTreasury == address(0) ||
            _maxCooldownBlocksBasisPoints == 0
        ) revert InvalidZeroInput();

        // verify protocol fee
        if (_protocolFee > BASIS_POINTS) revert InvalidFee();
        if (_maxCooldownBlocksBasisPoints > BASIS_POINTS)
            revert InvalidMaxCooldownBlocksBasisPoints();

        strategyManager = _strategyManager;
        delegationManager = _delegationManager;
        rewardsCoordinator = _rewardsCoordinator;
        protocolFee = _protocolFee;
        protocolTreasury = _protocolTreasury;
        maxCooldownBlocksBasisPoints = _maxCooldownBlocksBasisPoints;
        EIGEN = _eigen;
        B_EIGEN = _bEigen;
        _disableInitializers();
    }

    function initialize(
        string memory _name,
        string memory _symbol,
        IERC20 _underlying,
        IStrategy _strategy,
        address vaultOwner,
        uint256 _cooldownBlocks,
        uint256 _vaultFee,
        address _vaultFeeDestination,
        address _rewardsDestination
    ) public initializer {
        // check for zero values
        if (
            address(_underlying) == address(0) ||
            address(_strategy) == address(0) ||
            vaultOwner == address(0) ||
            _vaultFeeDestination == address(0) ||
            _rewardsDestination == address(0) ||
            bytes(_name).length == 0 ||
            bytes(_symbol).length == 0
        ) revert InvalidZeroInput();

        // verify vault fee
        if (_vaultFee + protocolFee > BASIS_POINTS) revert InvalidFee();

        // check strategy whitelisted,
        // Note: beaconStrategy will fail as it is not whitelisted under strategyManager
        if (!strategyManager.strategyIsWhitelistedForDeposit(_strategy)) revert InvalidStrategy();

        // check if underlying token is EIGEN
        if (_underlying == EIGEN || _underlying == B_EIGEN) {
            // revert if strategy underlying is not bEIGEN
            if (IStrategy(_strategy).underlyingToken() != B_EIGEN) revert InvalidUnderlyingToken();
        } else {
            // check underlying token
            if (IStrategy(_strategy).underlyingToken() != _underlying)
                revert InvalidUnderlyingToken();
        }

        // check for cooldown blocks
        IStrategy[] memory _strategies = new IStrategy[](1);
        _strategies[0] = _strategy;
        if (_cooldownBlocks < delegationManager.getWithdrawalDelay(_strategies))
            revert InvalidWithdrawalCooldown();

        __ERC20_init(_name, _symbol);

        // ReentrancyGuard init
        __ReentrancyGuard_init();

        // transfer ownership to vaultOwner
        _transferOwnership(vaultOwner);

        // set underlying asset and strategy
        underlying = _underlying;
        underlyingStrategy = _strategy;
        underlyingDecimals = ERC20(address(_underlying)).decimals();
        vaultCooldownBlocks = _cooldownBlocks;
        cooldownBlocksUpdatedAt = block.number;
        vaultFee = _vaultFee;
        vaultFeeDestination = _vaultFeeDestination;
        vaultRewardsDestination = _rewardsDestination;
    }

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

    /// @dev Sets the address to delegate tokens to in EigenLayer - Can only delegate to Single Operator
    function setDelegateAddress(
        address _delegateAddress,
        ISignatureUtils.SignatureWithExpiry memory approverSignatureAndExpiry,
        bytes32 approverSalt
    ) external nonReentrant onlyOwner {
        if (address(_delegateAddress) == address(0x0)) revert InvalidZeroInput();
        // check the delegation status on EigenLayer
        // Note: In case of force undelegation by delegatedOperator delegatedTo will be updated to address(0)
        if (delegationManager.delegatedTo(address(this)) != address(0)) revert AlreadyDelegated();

        delegationManager.delegateTo(_delegateAddress, approverSignatureAndExpiry, approverSalt);

        emit DelegationAddressUpdated(_delegateAddress);
    }

    function setCooldownBlocks(uint256 _cooldownBlocks) external nonReentrant onlyOwner {
        IStrategy[] memory _strategies = new IStrategy[](1);
        _strategies[0] = underlyingStrategy;
        uint256 minCooldownBlocks = delegationManager.getWithdrawalDelay(_strategies);
        // check for cooldown blocks
        if (_cooldownBlocks < minCooldownBlocks || _cooldownBlocks == 0)
            revert InvalidWithdrawalCooldown();
        // check for valid cooldownBlocks config
        if (_cooldownBlocks > minCooldownBlocks) {
            uint256 maxCooldownBlocksAllowed = minCooldownBlocks +
                (minCooldownBlocks * maxCooldownBlocksBasisPoints) /
                BASIS_POINTS;
            // check for max cooldownblocks allowed
            if (_cooldownBlocks > maxCooldownBlocksAllowed) revert ExceedMaxCooldownBlocks();

            // check for cooldown config last updated
            _checkCooldownBlocksUpdateDelay();
        }
        emit VaultCooldownUpdated(vaultCooldownBlocks, _cooldownBlocks);
        vaultCooldownBlocks = _cooldownBlocks;
        cooldownBlocksUpdatedAt = block.number;
    }

    /**
     * @notice  Pause the vault
     * @dev     permissioned call (onlyPuaser)
     */
    function pause() external onlyPauser {
        paused = true;
        emit Paused(true);
    }

    /**
     * @notice  UnPause the vault
     * @dev     permissioned call (onlyOwner)
     */
    function unpause() external onlyOwner {
        paused = false;
        emit Paused(false);
    }

    /**
     * @notice  Update pauser address
     * @dev     permissioned call (onlyOwner)
     * @param   _pauser  new pauser address
     */
    function setPauser(address _pauser) external onlyOwner {
        if (_pauser == address(0)) revert InvalidZeroInput();
        emit PauserUpdated(pauser, _pauser);
        pauser = _pauser;
    }

    /// @dev Deposit tokens into the EigenLayer.  This call assumes any balance of tokens in this contract will be delegated
    /// so do not directly send tokens here or they will be delegated and attributed to the next caller.
    /// @return shares The amount of new shares in the `strategy` created as part of the action.
    function deposit(
        uint256 tokenAmount
    ) external nonReentrant onlyWhenDelegated whenNotPaused returns (uint256 shares) {
        if (tokenAmount == 0) revert InvalidZeroInput();

        // Move the tokens into vault
        underlying.safeTransferFrom(msg.sender, address(this), tokenAmount);

        // calculate mint amount
        // if totalSupply of LP token is 0 mint the initial amount at 1:1
        uint256 mintAmount = (tokenAmount * scaleFactor()) / getRate();

        // sanity check
        if (mintAmount == 0) revert InvalidTokenAmount();
        _mint(msg.sender, mintAmount);
        shares = _deposit(tokenAmount);

        emit Deposit(msg.sender, tokenAmount, mintAmount);
    }

    /**
     * @notice  Perform necessary checks on input data and deposits into EigenLayer
     * @param   _tokenAmount  amount of given token to deposit
     * @return  shares  shares for deposited amount
     */
    function _deposit(uint256 _tokenAmount) internal returns (uint256 shares) {
        // Approve the strategy manager to spend the tokens
        underlying.safeIncreaseAllowance(address(strategyManager), _tokenAmount);

        // Deposit the tokens via the strategy manager
        return strategyManager.depositIntoStrategy(underlyingStrategy, underlying, _tokenAmount);
    }

    /**
     * @notice  Tracks the pending queued withdrawal shares cause by Operator force undelegating the Vault
     * @dev     permissioned call (onlyOwner of Vault),
     *          EigenLayer link - https://github.com/Layr-Labs/eigenlayer-contracts/blob/dev/src/contracts/core/DelegationManager.sol#L242
     * @param   withdrawal  Withdrawal struct needs to be tracked
     */
    function emergencyTrackQueuedWithdrawal(
        IDelegationManager.Withdrawal memory withdrawal
    ) external onlyOwner {
        if (withdrawal.strategies[0] != underlyingStrategy) revert InvalidStrategy();
        bytes32 withdrawalRoot = delegationManager.calculateWithdrawalRoot(withdrawal);

        // verify withdrawal is not user initiated
        if (withdrawRequest[withdrawalRoot].withdrawer != address(0))
            revert UserWithdrawalAlreadyTracked();

        // verify emergency withdrawal is not tracked
        if (emergencyWithdrawal[withdrawalRoot]) revert WithdrawalAlreadyTracked();

        // verify withdrawal is pending and vault not double counting
        if (!delegationManager.pendingWithdrawals(withdrawalRoot))
            revert WithdrawalAlreadyCompleted();

        // track queued shares for the token
        queuedShares += withdrawal.shares[0];

        // track in emergencyWithdrawal
        emergencyWithdrawal[withdrawalRoot] = true;

        emit EmergencyWithdrawalTracked(withdrawal);
    }

    /**
     * @notice  Complete Emergency queued withdrwal initiated by force undelegation by OperatorDelegator
     * @dev     permissioned call by OnlyOwner of vault
     * @param   withdrawal  Withdrawal struct for EigenLayer
     */
    function completeEmergencyTrackedWithdrawal(
        IDelegationManager.Withdrawal memory withdrawal
    ) external onlyOwner {
        bytes32 withdrawalRoot = delegationManager.calculateWithdrawalRoot(withdrawal);

        if (!emergencyWithdrawal[withdrawalRoot]) revert InvalidWithdrawal();
        IERC20[] memory tokens = new IERC20[](1);
        tokens[0] = underlying;

        // complete the queued Withdrawal
        delegationManager.completeQueuedWithdrawal(withdrawal, tokens, 0, true);

        // reduce queuedShares to avoid double counting
        queuedShares -= withdrawal.shares[0];

        // reset emergencyQueuedWithdrawal
        delete emergencyWithdrawal[withdrawalRoot];

        // redeposit funds to strategy
        _deposit(underlying.balanceOf(address(this)));

        emit EmergencyWithdrawalCompleted(withdrawal);
    }

    /**
     * @notice  Creates a withdraw request for user and queueWithdrawal on EigenLayer
     * @param   tokenAmount  amount of LP token to withdraw
     */
    function withdraw(
        uint256 tokenAmount
    ) external nonReentrant onlyWhenDelegated whenNotPaused returns (bytes32) {
        if (tokenAmount == 0) revert InvalidZeroInput();
        // Move LP tokens to vault
        this.transferFrom(msg.sender, address(this), tokenAmount);

        // get rate of LP tokens -> underlying tokens
        uint256 underlyingAmount = (tokenAmount * getRate()) / scaleFactor();

        // create queuedWithdrawalParams struct for withdrawRequest
        IDelegationManager.QueuedWithdrawalParams[]
            memory queuedWithdrawalParams = _getQueuedWithdrawalParam(underlyingAmount);

        // track queued shares
        queuedShares += queuedWithdrawalParams[0].shares[0];

        // Save the nonce before starting the withdrawal
        uint96 nonce = uint96(delegationManager.cumulativeWithdrawalsQueued(address(this)));

        // queue withdrawal in EigenLayer
        bytes32 withdrawalRoot = delegationManager.queueWithdrawals(queuedWithdrawalParams)[0];

        // track user withdraw request
        withdrawRequest[withdrawalRoot] = UserWithdrawRequest(
            msg.sender,
            tokenAmount,
            block.number
        );

        // Emit the withdrawal started event
        emit WithdrawStarted(
            withdrawalRoot,
            msg.sender,
            address(this),
            delegationManager.delegatedTo(address(this)),
            address(this),
            nonce,
            block.number,
            queuedWithdrawalParams[0].strategies,
            queuedWithdrawalParams[0].shares
        );

        return withdrawalRoot;
    }

    /**
     * @notice  Claim the requested withdraw
     * @dev     only the withdrawer can claim the request after vault cooldownBlocks
     * @param   withdrawal  Withdrawal struct for EigenLayer completeQueuedWithdrawal
     */
    function claim(
        IDelegationManager.Withdrawal calldata withdrawal
    ) external nonReentrant onlyWhenDelegated whenNotPaused {
        bytes32 withdrawalRoot = delegationManager.calculateWithdrawalRoot(withdrawal);

        if (msg.sender != withdrawRequest[withdrawalRoot].withdrawer || msg.sender == address(0))
            revert UnAuthorizedClaimer();

        if (block.number - withdrawRequest[withdrawalRoot].createdAt < cooldownBlocks())
            revert EarlyClaim();

        IERC20[] memory tokens = new IERC20[](1);
        tokens[0] = underlying;

        // burn LP token
        _burn(address(this), withdrawRequest[withdrawalRoot].lpTokenAmountLocked);

        // reduce queued Shares for this request
        queuedShares -= withdrawal.shares[0];

        // check balance before completing queuedWithdrawal
        uint256 balanceBefore = underlying.balanceOf(address(this));

        // complete withdrawal on EigenLayer
        delegationManager.completeQueuedWithdrawal(withdrawal, tokens, 0, true);

        uint256 underlyingClaimAmount = underlying.balanceOf(address(this)) - balanceBefore;

        // transfer received amount of underlying to msg.sender
        underlying.safeTransfer(msg.sender, underlyingClaimAmount);

        emit WithdrawRequestClaimed(withdrawalRoot, msg.sender, underlyingClaimAmount, withdrawal);

        // delete recorded withdrawRequest
        delete withdrawRequest[withdrawalRoot];
    }

    /**
     * @notice  Claim ERC20 rewards from EigenLayer
     * @dev     permissioned call (onlyOwner)
     * @param   _claim  RewardsMerkleClaim object to process claim
     */
    function processRewards(
        IRewardsCoordinator.RewardsMerkleClaim calldata _claim
    ) external onlyOwner {
        // check rewards Destination is configured
        if (vaultRewardsDestination == address(0)) revert RewardsDestinationNotConfigured();

        rewardsCoordinator.processClaim(_claim, address(this));

        for (uint256 i = 0; i < _claim.tokenLeaves.length; ) {
            // deduct fee for each rewards token
            uint256 remainingRewards = _processRewardsFee(_claim.tokenLeaves[i].token);
            // process the rewards
            _processRewards(_claim.tokenLeaves[i].token, remainingRewards);
            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice  Allows anyone to incentivize the vault by donating underlying
     * @dev     does not mint LP token for the incentive deposited
     * @param   amount  amount of underlying tokens
     */
    function depositIncentive(uint256 amount) external nonReentrant {
        if (amount == 0) revert InvalidZeroInput();

        // transfer underlying from caller to vault
        underlying.safeTransferFrom(msg.sender, address(this), amount);

        // deposit the underlying in underlyingStrategy
        _deposit(amount);

        emit IncentiveDeposited(amount);
    }

    /**
     * @notice  sweep any ERC20 token from vault contract
     * @dev     considers any token balance in vault as rewards, permissioned call (onlyOwner)
     * @param   token  token contract to perform sweep
     */
    function sweepERC20(IERC20 token) external nonReentrant onlyOwner {
        // revert if owner tries to sweep lp tokens
        if (address(token) == address(this)) revert InvalidTokenSweep();
        uint256 tokenBalance = token.balanceOf(address(this));
        if (tokenBalance == 0) revert InvalidZeroBalance();

        uint256 remainingBalance = _processRewardsFee(token);
        _processRewards(token, remainingBalance);
    }

    /// @dev getter for vault cooldown blocks. returns max cooldown blocks for strategy
    function cooldownBlocks() public view returns (uint256) {
        IStrategy[] memory strategies = new IStrategy[](1);
        strategies[0] = underlyingStrategy;
        return
            (delegationManager.getWithdrawalDelay(strategies) > vaultCooldownBlocks)
                ? delegationManager.getWithdrawalDelay(strategies)
                : vaultCooldownBlocks;
    }

    /// @dev Gets the underlying token amount from the amount of shares + queued withdrawal shares
    function getUnderlyingBalanceFromStrategy() public view returns (uint256) {
        return
            queuedShares == 0
                ? underlyingStrategy.userUnderlyingView(address(this))
                : underlyingStrategy.userUnderlyingView(address(this)) +
                    underlyingStrategy.sharesToUnderlyingView(queuedShares);
    }

    /// @dev returns the scale factor according to underlying decimals
    function scaleFactor() public view returns (uint256) {
        return (10 ** underlyingDecimals);
    }

    /// @dev Gets the current rate of LP token
    function getRate() public view returns (uint256) {
        return
            ((getUnderlyingBalanceFromStrategy() + BALANCE_OFFSET) * scaleFactor()) /
            (totalSupply() + SHARE_OFFSET);
    }

    /// @dev process the rewards received for specified token
    function _processRewards(IERC20 token, uint256 rewardsAmount) internal {
        // if reward token is underlying then redeposit
        if (token == underlying) {
            // redeposit into strategy
            _deposit(rewardsAmount);
        } else {
            // if reward token is not underlying then forward to RewardsDestination
            token.safeTransfer(vaultRewardsDestination, rewardsAmount);
        }
    }

    /// @dev process fee for the rewards received
    function _processRewardsFee(IERC20 token) internal returns (uint256) {
        uint256 totalRewards = token.balanceOf(address(this));
        // transfer protocol fee to protocol treasury
        uint256 protocolFeeShare = (totalRewards * protocolFee) / BASIS_POINTS;
        token.safeTransfer(protocolTreasury, protocolFeeShare);

        // transfer vault fee to configured vault fee destination
        uint256 vaultFeeShare = (totalRewards * vaultFee) / BASIS_POINTS;
        token.safeTransfer(vaultFeeDestination, vaultFeeShare);

        return totalRewards - (protocolFeeShare + vaultFeeShare);
    }

    /// @dev build the QueuedWithdrawalParam struct for EigenLayer withdrawals
    function _getQueuedWithdrawalParam(
        uint256 underlyingAmount
    )
        internal
        view
        returns (IDelegationManager.QueuedWithdrawalParams[] memory queuedWithdrawalParams)
    {
        // create queuedWithdrawalParams struct for withdrawRequest
        queuedWithdrawalParams = new IDelegationManager.QueuedWithdrawalParams[](1);
        // set vault strategy for 0th index only
        queuedWithdrawalParams[0].strategies = new IStrategy[](1);
        queuedWithdrawalParams[0].strategies[0] = underlyingStrategy;

        // set shares to withdraw for underlying
        queuedWithdrawalParams[0].shares = new uint256[](1);
        queuedWithdrawalParams[0].shares[0] = underlyingStrategy.underlyingToSharesView(
            underlyingAmount
        );

        // set withdrawer as this contract address
        queuedWithdrawalParams[0].withdrawer = address(this);
    }

    /// @dev ensures users have 7 days window to withdraw funds before owner can update the vaulCooldownBlocks
    function _checkCooldownBlocksUpdateDelay() internal view {
        if (block.number - cooldownBlocksUpdatedAt < vaultCooldownBlocks + SEVEN_DAYS_BLOCKS)
            revert EarlyCooldownBlocksUpdate();
    }
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @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 Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 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 functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _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 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _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() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @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 {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

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

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

pragma solidity ^0.8.0;
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 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;

    uint256 private _status;

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

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _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 {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // 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) {
        return _status == _ENTERED;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import { Initializable } from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is
    Initializable,
    ContextUpgradeable,
    IERC20Upgradeable,
    IERC20MetadataUpgradeable
{
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(
        string memory name_,
        string memory symbol_
    ) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

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

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

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

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

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

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

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

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

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

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

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

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/UpgradeableBeacon.sol)

pragma solidity ^0.8.0;

import "./IBeacon.sol";
import "../../access/Ownable.sol";
import "../../utils/Address.sol";

/**
 * @dev This contract is used in conjunction with one or more instances of {BeaconProxy} to determine their
 * implementation contract, which is where they will delegate all function calls.
 *
 * An owner is able to change the implementation the beacon points to, thus upgrading the proxies that use this beacon.
 */
contract UpgradeableBeacon is IBeacon, Ownable {
    address private _implementation;

    /**
     * @dev Emitted when the implementation returned by the beacon is changed.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Sets the address of the initial implementation, and the deployer account as the owner who can upgrade the
     * beacon.
     */
    constructor(address implementation_) {
        _setImplementation(implementation_);
    }

    /**
     * @dev Returns the current implementation address.
     */
    function implementation() public view virtual override returns (address) {
        return _implementation;
    }

    /**
     * @dev Upgrades the beacon to a new implementation.
     *
     * Emits an {Upgraded} event.
     *
     * Requirements:
     *
     * - msg.sender must be the owner of the contract.
     * - `newImplementation` must be a contract.
     */
    function upgradeTo(address newImplementation) public virtual onlyOwner {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Sets the implementation contract address for this beacon
     *
     * Requirements:
     *
     * - `newImplementation` must be a contract.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableBeacon: implementation is not a contract");
        _implementation = newImplementation;
    }
}

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

pragma solidity ^0.8.0;

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

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

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

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

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

import "./IStrategy.sol";
import "./ISignatureUtils.sol";
import "./IStrategyManager.sol";

/**
 * @title DelegationManager
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice  This is the contract for delegation in EigenLayer. The main functionalities of this contract are
 * - enabling anyone to register as an operator in EigenLayer
 * - allowing operators to specify parameters related to stakers who delegate to them
 * - enabling any staker to delegate its stake to the operator of its choice (a given staker can only delegate to a single operator at a time)
 * - enabling a staker to undelegate its assets from the operator it is delegated to (performed as part of the withdrawal process, initiated through the StrategyManager)
 */
interface IDelegationManager is ISignatureUtils {
    // Access to public vars - hack locally
    function beaconChainETHStrategy() external returns (IStrategy);
    function pendingWithdrawals(bytes32 withdrawalRoot) external view returns (bool);
    function getDelegatableShares(
        address staker
    ) external view returns (IStrategy[] memory, uint256[] memory);

    // @notice Struct used for storing information about a single operator who has registered with EigenLayer
    struct OperatorDetails {
        // @notice address to receive the rewards that the operator earns via serving applications built on EigenLayer.
        address earningsReceiver;
        /**
         * @notice Address to verify signatures when a staker wishes to delegate to the operator, as well as controlling "forced undelegations".
         * @dev Signature verification follows these rules:
         * 1) If this address is left as address(0), then any staker will be free to delegate to the operator, i.e. no signature verification will be performed.
         * 2) If this address is an EOA (i.e. it has no code), then we follow standard ECDSA signature verification for delegations to the operator.
         * 3) If this address is a contract (i.e. it has code) then we forward a call to the contract and verify that it returns the correct EIP-1271 "magic value".
         */
        address delegationApprover;
        /**
         * @notice A minimum delay -- measured in blocks -- enforced between:
         * 1) the operator signalling their intent to register for a service, via calling `Slasher.optIntoSlashing`
         * and
         * 2) the operator completing registration for the service, via the service ultimately calling `Slasher.recordFirstStakeUpdate`
         * @dev note that for a specific operator, this value *cannot decrease*, i.e. if the operator wishes to modify their OperatorDetails,
         * then they are only allowed to either increase this value or keep it the same.
         */
        uint32 stakerOptOutWindowBlocks;
    }

    /**
     * @notice Abstract struct used in calculating an EIP712 signature for a staker to approve that they (the staker themselves) delegate to a specific operator.
     * @dev Used in computing the `STAKER_DELEGATION_TYPEHASH` and as a reference in the computation of the stakerDigestHash in the `delegateToBySignature` function.
     */
    struct StakerDelegation {
        // the staker who is delegating
        address staker;
        // the operator being delegated to
        address operator;
        // the staker's nonce
        uint256 nonce;
        // the expiration timestamp (UTC) of the signature
        uint256 expiry;
    }

    /**
     * @notice Abstract struct used in calculating an EIP712 signature for an operator's delegationApprover to approve that a specific staker delegate to the operator.
     * @dev Used in computing the `DELEGATION_APPROVAL_TYPEHASH` and as a reference in the computation of the approverDigestHash in the `_delegate` function.
     */
    struct DelegationApproval {
        // the staker who is delegating
        address staker;
        // the operator being delegated to
        address operator;
        // the operator's provided salt
        bytes32 salt;
        // the expiration timestamp (UTC) of the signature
        uint256 expiry;
    }

    /**
     * Struct type used to specify an existing queued withdrawal. Rather than storing the entire struct, only a hash is stored.
     * In functions that operate on existing queued withdrawals -- e.g. completeQueuedWithdrawal`, the data is resubmitted and the hash of the submitted
     * data is computed by `calculateWithdrawalRoot` and checked against the stored hash in order to confirm the integrity of the submitted data.
     */
    struct Withdrawal {
        // The address that originated the Withdrawal
        address staker;
        // The address that the staker was delegated to at the time that the Withdrawal was created
        address delegatedTo;
        // The address that can complete the Withdrawal + will receive funds when completing the withdrawal
        address withdrawer;
        // Nonce used to guarantee that otherwise identical withdrawals have unique hashes
        uint256 nonce;
        // Block number when the Withdrawal was created
        uint32 startBlock;
        // Array of strategies that the Withdrawal contains
        IStrategy[] strategies;
        // Array containing the amount of shares in each Strategy in the `strategies` array
        uint256[] shares;
    }

    struct QueuedWithdrawalParams {
        // Array of strategies that the QueuedWithdrawal contains
        IStrategy[] strategies;
        // Array containing the amount of shares in each Strategy in the `strategies` array
        uint256[] shares;
        // The address of the withdrawer
        address withdrawer;
    }

    // @notice Emitted when a new operator registers in EigenLayer and provides their OperatorDetails.
    event OperatorRegistered(address indexed operator, OperatorDetails operatorDetails);

    /// @notice Emitted when an operator updates their OperatorDetails to @param newOperatorDetails
    event OperatorDetailsModified(address indexed operator, OperatorDetails newOperatorDetails);

    /**
     * @notice Emitted when @param operator indicates that they are updating their MetadataURI string
     * @dev Note that these strings are *never stored in storage* and are instead purely emitted in events for off-chain indexing
     */
    event OperatorMetadataURIUpdated(address indexed operator, string metadataURI);

    /// @notice Emitted whenever an operator's shares are increased for a given strategy. Note that shares is the delta in the operator's shares.
    event OperatorSharesIncreased(
        address indexed operator,
        address staker,
        IStrategy strategy,
        uint256 shares
    );

    /// @notice Emitted whenever an operator's shares are decreased for a given strategy. Note that shares is the delta in the operator's shares.
    event OperatorSharesDecreased(
        address indexed operator,
        address staker,
        IStrategy strategy,
        uint256 shares
    );

    /// @notice Emitted when @param staker delegates to @param operator.
    event StakerDelegated(address indexed staker, address indexed operator);

    /// @notice Emitted when @param staker undelegates from @param operator.
    event StakerUndelegated(address indexed staker, address indexed operator);

    /// @notice Emitted when @param staker is undelegated via a call not originating from the staker themself
    event StakerForceUndelegated(address indexed staker, address indexed operator);

    /**
     * @notice Emitted when a new withdrawal is queued.
     * @param withdrawalRoot Is the hash of the `withdrawal`.
     * @param withdrawal Is the withdrawal itself.
     */
    event WithdrawalQueued(bytes32 withdrawalRoot, Withdrawal withdrawal);

    /// @notice Emitted when a queued withdrawal is completed
    event WithdrawalCompleted(bytes32 withdrawalRoot);

    /// @notice Emitted when a queued withdrawal is *migrated* from the StrategyManager to the DelegationManager
    event WithdrawalMigrated(bytes32 oldWithdrawalRoot, bytes32 newWithdrawalRoot);

    /// @notice Emitted when the `minWithdrawalDelayBlocks` variable is modified from `previousValue` to `newValue`.
    event MinWithdrawalDelayBlocksSet(uint256 previousValue, uint256 newValue);

    /// @notice Emitted when the `strategyWithdrawalDelayBlocks` variable is modified from `previousValue` to `newValue`.
    event StrategyWithdrawalDelayBlocksSet(
        IStrategy strategy,
        uint256 previousValue,
        uint256 newValue
    );

    /**
     * @notice Registers the caller as an operator in EigenLayer.
     * @param registeringOperatorDetails is the `OperatorDetails` for the operator.
     * @param metadataURI is a URI for the operator's metadata, i.e. a link providing more details on the operator.
     *
     * @dev Once an operator is registered, they cannot 'deregister' as an operator, and they will forever be considered "delegated to themself".
     * @dev This function will revert if the caller attempts to set their `earningsReceiver` to address(0).
     * @dev Note that the `metadataURI` is *never stored * and is only emitted in the `OperatorMetadataURIUpdated` event
     */
    function registerAsOperator(
        OperatorDetails calldata registeringOperatorDetails,
        string calldata metadataURI
    ) external;

    /**
     * @notice Updates an operator's stored `OperatorDetails`.
     * @param newOperatorDetails is the updated `OperatorDetails` for the operator, to replace their current OperatorDetails`.
     *
     * @dev The caller must have previously registered as an operator in EigenLayer.
     * @dev This function will revert if the caller attempts to set their `earningsReceiver` to address(0).
     */
    function modifyOperatorDetails(OperatorDetails calldata newOperatorDetails) external;

    /**
     * @notice Called by an operator to emit an `OperatorMetadataURIUpdated` event indicating the information has updated.
     * @param metadataURI The URI for metadata associated with an operator
     * @dev Note that the `metadataURI` is *never stored * and is only emitted in the `OperatorMetadataURIUpdated` event
     */
    function updateOperatorMetadataURI(string calldata metadataURI) external;

    /**
     * @notice Caller delegates their stake to an operator.
     * @param operator The account (`msg.sender`) is delegating its assets to for use in serving applications built on EigenLayer.
     * @param approverSignatureAndExpiry Verifies the operator approves of this delegation
     * @param approverSalt A unique single use value tied to an individual signature.
     * @dev The approverSignatureAndExpiry is used in the event that:
     *          1) the operator's `delegationApprover` address is set to a non-zero value.
     *                  AND
     *          2) neither the operator nor their `delegationApprover` is the `msg.sender`, since in the event that the operator
     *             or their delegationApprover is the `msg.sender`, then approval is assumed.
     * @dev In the event that `approverSignatureAndExpiry` is not checked, its content is ignored entirely; it's recommended to use an empty input
     * in this case to save on complexity + gas costs
     */
    function delegateTo(
        address operator,
        SignatureWithExpiry memory approverSignatureAndExpiry,
        bytes32 approverSalt
    ) external;

    /**
     * @notice Caller delegates a staker's stake to an operator with valid signatures from both parties.
     * @param staker The account delegating stake to an `operator` account
     * @param operator The account (`staker`) is delegating its assets to for use in serving applications built on EigenLayer.
     * @param stakerSignatureAndExpiry Signed data from the staker authorizing delegating stake to an operator
     * @param approverSignatureAndExpiry is a parameter that will be used for verifying that the operator approves of this delegation action in the event that:
     * @param approverSalt Is a salt used to help guarantee signature uniqueness. Each salt can only be used once by a given approver.
     *
     * @dev If `staker` is an EOA, then `stakerSignature` is verified to be a valid ECDSA stakerSignature from `staker`, indicating their intention for this action.
     * @dev If `staker` is a contract, then `stakerSignature` will be checked according to EIP-1271.
     * @dev the operator's `delegationApprover` address is set to a non-zero value.
     * @dev neither the operator nor their `delegationApprover` is the `msg.sender`, since in the event that the operator or their delegationApprover
     * is the `msg.sender`, then approval is assumed.
     * @dev This function will revert if the current `block.timestamp` is equal to or exceeds the expiry
     * @dev In the case that `approverSignatureAndExpiry` is not checked, its content is ignored entirely; it's recommended to use an empty input
     * in this case to save on complexity + gas costs
     */
    function delegateToBySignature(
        address staker,
        address operator,
        SignatureWithExpiry memory stakerSignatureAndExpiry,
        SignatureWithExpiry memory approverSignatureAndExpiry,
        bytes32 approverSalt
    ) external;

    /**
     * @notice Undelegates the staker from the operator who they are delegated to. Puts the staker into the "undelegation limbo" mode of the EigenPodManager
     * and queues a withdrawal of all of the staker's shares in the StrategyManager (to the staker), if necessary.
     * @param staker The account to be undelegated.
     * @return withdrawalRoot The root of the newly queued withdrawal, if a withdrawal was queued. Otherwise just bytes32(0).
     *
     * @dev Reverts if the `staker` is also an operator, since operators are not allowed to undelegate from themselves.
     * @dev Reverts if the caller is not the staker, nor the operator who the staker is delegated to, nor the operator's specified "delegationApprover"
     * @dev Reverts if the `staker` is already undelegated.
     */
    function undelegate(address staker) external returns (bytes32[] memory withdrawalRoot);

    /**
     * Allows a staker to withdraw some shares. Withdrawn shares/strategies are immediately removed
     * from the staker. If the staker is delegated, withdrawn shares/strategies are also removed from
     * their operator.
     *
     * All withdrawn shares/strategies are placed in a queue and can be fully withdrawn after a delay.
     */
    function queueWithdrawals(
        QueuedWithdrawalParams[] calldata queuedWithdrawalParams
    ) external returns (bytes32[] memory);

    /**
     * @notice Used to complete the specified `withdrawal`. The caller must match `withdrawal.withdrawer`
     * @param withdrawal The Withdrawal to complete.
     * @param tokens Array in which the i-th entry specifies the `token` input to the 'withdraw' function of the i-th Strategy in the `withdrawal.strategies` array.
     * This input can be provided with zero length if `receiveAsTokens` is set to 'false' (since in that case, this input will be unused)
     * @param middlewareTimesIndex is the index in the operator that the staker who triggered the withdrawal was delegated to's middleware times array
     * @param receiveAsTokens If true, the shares specified in the withdrawal will be withdrawn from the specified strategies themselves
     * and sent to the caller, through calls to `withdrawal.strategies[i].withdraw`. If false, then the shares in the specified strategies
     * will simply be transferred to the caller directly.
     * @dev middlewareTimesIndex should be calculated off chain before calling this function by finding the first index that satisfies `slasher.canWithdraw`
     * @dev beaconChainETHStrategy shares are non-transferrable, so if `receiveAsTokens = false` and `withdrawal.withdrawer != withdrawal.staker`, note that
     * any beaconChainETHStrategy shares in the `withdrawal` will be _returned to the staker_, rather than transferred to the withdrawer, unlike shares in
     * any other strategies, which will be transferred to the withdrawer.
     */
    function completeQueuedWithdrawal(
        Withdrawal calldata withdrawal,
        IERC20[] calldata tokens,
        uint256 middlewareTimesIndex,
        bool receiveAsTokens
    ) external;

    /**
     * @notice Array-ified version of `completeQueuedWithdrawal`.
     * Used to complete the specified `withdrawals`. The function caller must match `withdrawals[...].withdrawer`
     * @param withdrawals The Withdrawals to complete.
     * @param tokens Array of tokens for each Withdrawal. See `completeQueuedWithdrawal` for the usage of a single array.
     * @param middlewareTimesIndexes One index to reference per Withdrawal. See `completeQueuedWithdrawal` for the usage of a single index.
     * @param receiveAsTokens Whether or not to complete each withdrawal as tokens. See `completeQueuedWithdrawal` for the usage of a single boolean.
     * @dev See `completeQueuedWithdrawal` for relevant dev tags
     */
    function completeQueuedWithdrawals(
        Withdrawal[] calldata withdrawals,
        IERC20[][] calldata tokens,
        uint256[] calldata middlewareTimesIndexes,
        bool[] calldata receiveAsTokens
    ) external;

    /**
     * @notice Increases a staker's delegated share balance in a strategy.
     * @param staker The address to increase the delegated shares for their operator.
     * @param strategy The strategy in which to increase the delegated shares.
     * @param shares The number of shares to increase.
     *
     * @dev *If the staker is actively delegated*, then increases the `staker`'s delegated shares in `strategy` by `shares`. Otherwise does nothing.
     * @dev Callable only by the StrategyManager or EigenPodManager.
     */
    function increaseDelegatedShares(address staker, IStrategy strategy, uint256 shares) external;

    /**
     * @notice Decreases a staker's delegated share balance in a strategy.
     * @param staker The address to increase the delegated shares for their operator.
     * @param strategy The strategy in which to decrease the delegated shares.
     * @param shares The number of shares to decrease.
     *
     * @dev *If the staker is actively delegated*, then decreases the `staker`'s delegated shares in `strategy` by `shares`. Otherwise does nothing.
     * @dev Callable only by the StrategyManager or EigenPodManager.
     */
    function decreaseDelegatedShares(address staker, IStrategy strategy, uint256 shares) external;

    /**
     * @notice returns the address of the operator that `staker` is delegated to.
     * @notice Mapping: staker => operator whom the staker is currently delegated to.
     * @dev Note that returning address(0) indicates that the staker is not actively delegated to any operator.
     */
    function delegatedTo(address staker) external view returns (address);

    /**
     * @notice Returns the OperatorDetails struct associated with an `operator`.
     */
    function operatorDetails(address operator) external view returns (OperatorDetails memory);

    /*
     * @notice Returns the earnings receiver address for an operator
     */
    function earningsReceiver(address operator) external view returns (address);

    /**
     * @notice Returns the delegationApprover account for an operator
     */
    function delegationApprover(address operator) external view returns (address);

    /**
     * @notice Returns the stakerOptOutWindowBlocks for an operator
     */
    function stakerOptOutWindowBlocks(address operator) external view returns (uint256);

    /**
     * @notice Given array of strategies, returns array of shares for the operator
     */
    function getOperatorShares(
        address operator,
        IStrategy[] memory strategies
    ) external view returns (uint256[] memory);

    /**
     * @notice Given a list of strategies, return the minimum number of blocks that must pass to withdraw
     * from all the inputted strategies. Return value is >= minWithdrawalDelayBlocks as this is the global min withdrawal delay.
     * @param strategies The strategies to check withdrawal delays for
     */
    function getWithdrawalDelay(IStrategy[] calldata strategies) external view returns (uint256);

    /**
     * @notice returns the total number of shares in `strategy` that are delegated to `operator`.
     * @notice Mapping: operator => strategy => total number of shares in the strategy delegated to the operator.
     * @dev By design, the following invariant should hold for each Strategy:
     * (operator's shares in delegation manager) = sum (shares above zero of all stakers delegated to operator)
     * = sum (delegateable shares of all stakers delegated to the operator)
     */
    function operatorShares(address operator, IStrategy strategy) external view returns (uint256);

    /**
     * @notice Returns 'true' if `staker` *is* actively delegated, and 'false' otherwise.
     */
    function isDelegated(address staker) external view returns (bool);

    /**
     * @notice Returns true is an operator has previously registered for delegation.
     */
    function isOperator(address operator) external view returns (bool);

    /// @notice Mapping: staker => number of signed delegation nonces (used in `delegateToBySignature`) from the staker that the contract has already checked
    function stakerNonce(address staker) external view returns (uint256);

    /**
     * @notice Mapping: delegationApprover => 32-byte salt => whether or not the salt has already been used by the delegationApprover.
     * @dev Salts are used in the `delegateTo` and `delegateToBySignature` functions. Note that these functions only process the delegationApprover's
     * signature + the provided salt if the operator being delegated to has specified a nonzero address as their `delegationApprover`.
     */
    function delegationApproverSaltIsSpent(
        address _delegationApprover,
        bytes32 salt
    ) external view returns (bool);

    /**
     * @notice Minimum delay enforced by this contract for completing queued withdrawals. Measured in blocks, and adjustable by this contract's owner,
     * up to a maximum of `MAX_WITHDRAWAL_DELAY_BLOCKS`. Minimum value is 0 (i.e. no delay enforced).
     * Note that strategies each have a separate withdrawal delay, which can be greater than this value. So the minimum number of blocks that must pass
     * to withdraw a strategy is MAX(minWithdrawalDelayBlocks, strategyWithdrawalDelayBlocks[strategy])
     */
    function minWithdrawalDelayBlocks() external view returns (uint256);

    /**
     * @notice Minimum delay enforced by this contract per Strategy for completing queued withdrawals. Measured in blocks, and adjustable by this contract's owner,
     * up to a maximum of `MAX_WITHDRAWAL_DELAY_BLOCKS`. Minimum value is 0 (i.e. no delay enforced).
     */
    function strategyWithdrawalDelayBlocks(IStrategy strategy) external view returns (uint256);

    /**
     * @notice Calculates the digestHash for a `staker` to sign to delegate to an `operator`
     * @param staker The signing staker
     * @param operator The operator who is being delegated to
     * @param expiry The desired expiry time of the staker's signature
     */
    function calculateCurrentStakerDelegationDigestHash(
        address staker,
        address operator,
        uint256 expiry
    ) external view returns (bytes32);

    /**
     * @notice Calculates the digest hash to be signed and used in the `delegateToBySignature` function
     * @param staker The signing staker
     * @param _stakerNonce The nonce of the staker. In practice we use the staker's current nonce, stored at `stakerNonce[staker]`
     * @param operator The operator who is being delegated to
     * @param expiry The desired expiry time of the staker's signature
     */
    function calculateStakerDelegationDigestHash(
        address staker,
        uint256 _stakerNonce,
        address operator,
        uint256 expiry
    ) external view returns (bytes32);

    /**
     * @notice Calculates the digest hash to be signed by the operator's delegationApprove and used in the `delegateTo` and `delegateToBySignature` functions.
     * @param staker The account delegating their stake
     * @param operator The account receiving delegated stake
     * @param _delegationApprover the operator's `delegationApprover` who will be signing the delegationHash (in general)
     * @param approverSalt A unique and single use value associated with the approver signature.
     * @param expiry Time after which the approver's signature becomes invalid
     */
    function calculateDelegationApprovalDigestHash(
        address staker,
        address operator,
        address _delegationApprover,
        bytes32 approverSalt,
        uint256 expiry
    ) external view returns (bytes32);

    /// @notice The EIP-712 typehash for the contract's domain
    function DOMAIN_TYPEHASH() external view returns (bytes32);

    /// @notice The EIP-712 typehash for the StakerDelegation struct used by the contract
    function STAKER_DELEGATION_TYPEHASH() external view returns (bytes32);

    /// @notice The EIP-712 typehash for the DelegationApproval struct used by the contract
    function DELEGATION_APPROVAL_TYPEHASH() external view returns (bytes32);

    /**
     * @notice Getter function for the current EIP-712 domain separator for this contract.
     *
     * @dev The domain separator will change in the event of a fork that changes the ChainID.
     * @dev By introducing a domain separator the DApp developers are guaranteed that there can be no signature collision.
     * for more detailed information please read EIP-712.
     */
    function domainSeparator() external view returns (bytes32);

    /// @notice Mapping: staker => cumulative number of queued withdrawals they have ever initiated.
    /// @dev This only increments (doesn't decrement), and is used to help ensure that otherwise identical withdrawals have unique hashes.
    function cumulativeWithdrawalsQueued(address staker) external view returns (uint256);

    /// @notice Returns the keccak256 hash of `withdrawal`.
    function calculateWithdrawalRoot(Withdrawal memory withdrawal) external pure returns (bytes32);

    function migrateQueuedWithdrawals(
        IStrategyManager.DeprecatedStruct_QueuedWithdrawal[] memory withdrawalsToQueue
    ) external;
}

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// SPDX-License-Identifier: CC0-1.0

pragma solidity >=0.5.0;

// This interface is designed to be compatible with the Vyper version.
/// @notice This is the Ethereum 2.0 deposit contract interface.
/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
interface IETHPOSDeposit {
    /// @notice A processed deposit event.
    event DepositEvent(
        bytes pubkey,
        bytes withdrawal_credentials,
        bytes amount,
        bytes signature,
        bytes index
    );

    /// @notice Submit a Phase 0 DepositData object.
    /// @param pubkey A BLS12-381 public key.
    /// @param withdrawal_credentials Commitment to a public key for withdrawals.
    /// @param signature A BLS12-381 signature.
    /// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
    /// Used as a protection against malformed input.
    function deposit(
        bytes calldata pubkey,
        bytes calldata withdrawal_credentials,
        bytes calldata signature,
        bytes32 deposit_data_root
    ) external payable;

    /// @notice Query the current deposit root hash.
    /// @return The deposit root hash.
    function get_deposit_root() external view returns (bytes32);

    /// @notice Query the current deposit count.
    /// @return The deposit count encoded as a little endian 64-bit number.
    function get_deposit_count() external view returns (bytes memory);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

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

/**
 * @title The implementation contract used for restaking beacon chain ETH on EigenLayer
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @dev Note that all beacon chain balances are stored as gwei within the beacon chain datastructures. We choose
 *   to account balances in terms of gwei in the EigenPod contract and convert to wei when making calls to other contracts
 */
interface IEigenPod {
    /*******************************************************************************
                                   STRUCTS / ENUMS
    *******************************************************************************/

    enum VALIDATOR_STATUS {
        INACTIVE, // doesnt exist
        ACTIVE, // staked on ethpos and withdrawal credentials are pointed to the EigenPod
        WITHDRAWN // withdrawn from the Beacon Chain
    }

    struct ValidatorInfo {
        // index of the validator in the beacon chain
        uint64 validatorIndex;
        // amount of beacon chain ETH restaked on EigenLayer in gwei
        uint64 restakedBalanceGwei;
        //timestamp of the validator's most recent balance update
        uint64 lastCheckpointedAt;
        // status of the validator
        VALIDATOR_STATUS status;
    }

    struct Checkpoint {
        bytes32 beaconBlockRoot;
        uint24 proofsRemaining;
        uint64 podBalanceGwei;
        int128 balanceDeltasGwei;
    }

    /*******************************************************************************
                                       EVENTS
    *******************************************************************************/

    /// @notice Emitted when an ETH validator stakes via this eigenPod
    event EigenPodStaked(bytes pubkey);

    /// @notice Emitted when a pod owner updates the proof submitter address
    event ProofSubmitterUpdated(address prevProofSubmitter, address newProofSubmitter);

    /// @notice Emitted when an ETH validator's withdrawal credentials are successfully verified to be pointed to this eigenPod
    event ValidatorRestaked(uint40 validatorIndex);

    /// @notice Emitted when an ETH validator's  balance is proven to be updated.  Here newValidatorBalanceGwei
    //  is the validator's balance that is credited on EigenLayer.
    event ValidatorBalanceUpdated(
        uint40 validatorIndex,
        uint64 balanceTimestamp,
        uint64 newValidatorBalanceGwei
    );

    /// @notice Emitted when restaked beacon chain ETH is withdrawn from the eigenPod.
    event RestakedBeaconChainETHWithdrawn(address indexed recipient, uint256 amount);

    /// @notice Emitted when ETH is received via the `receive` fallback
    event NonBeaconChainETHReceived(uint256 amountReceived);

    /// @notice Emitted when a checkpoint is created
    event CheckpointCreated(
        uint64 indexed checkpointTimestamp,
        bytes32 indexed beaconBlockRoot,
        uint256 validatorCount
    );

    /// @notice Emitted when a checkpoint is finalized
    event CheckpointFinalized(uint64 indexed checkpointTimestamp, int256 totalShareDeltaWei);

    /// @notice Emitted when a validator is proven for a given checkpoint
    event ValidatorCheckpointed(uint64 indexed checkpointTimestamp, uint40 indexed validatorIndex);

    /// @notice Emitted when a validaor is proven to have 0 balance at a given checkpoint
    event ValidatorWithdrawn(uint64 indexed checkpointTimestamp, uint40 indexed validatorIndex);

    /*******************************************************************************
                          EXTERNAL STATE-CHANGING METHODS
    *******************************************************************************/

    /// @notice Used to initialize the pointers to contracts crucial to the pod's functionality, in beacon proxy construction from EigenPodManager
    function initialize(address owner) external;

    /// @notice Called by EigenPodManager when the owner wants to create another ETH validator.
    function stake(
        bytes calldata pubkey,
        bytes calldata signature,
        bytes32 depositDataRoot
    ) external payable;

    /**
     * @notice Transfers `amountWei` in ether from this contract to the specified `recipient` address
     * @notice Called by EigenPodManager to withdrawBeaconChainETH that has been added to the EigenPod's balance due to a withdrawal from the beacon chain.
     * @dev The podOwner must have already proved sufficient withdrawals, so that this pod's `withdrawableRestakedExecutionLayerGwei` exceeds the
     * `amountWei` input (when converted to GWEI).
     * @dev Reverts if `amountWei` is not a whole Gwei amount
     */
    function withdrawRestakedBeaconChainETH(address recipient, uint256 amount) external;

    /**
     * @dev Create a checkpoint used to prove this pod's active validator set. Checkpoints are completed
     * by submitting one checkpoint proof per ACTIVE validator. During the checkpoint process, the total
     * change in ACTIVE validator balance is tracked, and any validators with 0 balance are marked `WITHDRAWN`.
     * @dev Once finalized, the pod owner is awarded shares corresponding to:
     * - the total change in their ACTIVE validator balances
     * - any ETH in the pod not already awarded shares
     * @dev A checkpoint cannot be created if the pod already has an outstanding checkpoint. If
     * this is the case, the pod owner MUST complete the existing checkpoint before starting a new one.
     * @param revertIfNoBalance Forces a revert if the pod ETH balance is 0. This allows the pod owner
     * to prevent accidentally starting a checkpoint that will not increase their shares
     */
    function startCheckpoint(bool revertIfNoBalance) external;

    /**
     * @dev Progress the current checkpoint towards completion by submitting one or more validator
     * checkpoint proofs. Anyone can call this method to submit proofs towards the current checkpoint.
     * For each validator proven, the current checkpoint's `proofsRemaining` decreases.
     * @dev If the checkpoint's `proofsRemaining` reaches 0, the checkpoint is finalized.
     * (see `_updateCheckpoint` for more details)
     * @dev This method can only be called when there is a currently-active checkpoint.
     * @param balanceContainerProof proves the beacon's current balance container root against a checkpoint's `beaconBlockRoot`
     * @param proofs Proofs for one or more validator current balances against the `balanceContainerRoot`
     */
    function verifyCheckpointProofs(
        BeaconChainProofs.BalanceContainerProof calldata balanceContainerProof,
        BeaconChainProofs.BalanceProof[] calldata proofs
    ) external;

    /**
     * @dev Verify one or more validators have their withdrawal credentials pointed at this EigenPod, and award
     * shares based on their effective balance. Proven validators are marked `ACTIVE` within the EigenPod, and
     * future checkpoint proofs will need to include them.
     * @dev Withdrawal credential proofs MUST NOT be older than `currentCheckpointTimestamp`.
     * @dev Validators proven via this method MUST NOT have an exit epoch set already.
     * @param beaconTimestamp the beacon chain timestamp sent to the 4788 oracle contract. Corresponds
     * to the parent beacon block root against which the proof is verified.
     * @param stateRootProof proves a beacon state root against a beacon block root
     * @param validatorIndices a list of validator indices being proven
     * @param validatorFieldsProofs proofs of each validator's `validatorFields` against the beacon state root
     * @param validatorFields the fields of the beacon chain "Validator" container. See consensus specs for
     * details: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator
     */
    function verifyWithdrawalCredentials(
        uint64 beaconTimestamp,
        BeaconChainProofs.StateRootProof calldata stateRootProof,
        uint40[] calldata validatorIndices,
        bytes[] calldata validatorFieldsProofs,
        bytes32[][] calldata validatorFields
    ) external;

    /**
     * @dev Prove that one of this pod's active validators was slashed on the beacon chain. A successful
     * staleness proof allows the caller to start a checkpoint.
     *
     * @dev Note that in order to start a checkpoint, any existing checkpoint must already be completed!
     * (See `_startCheckpoint` for details)
     *
     * @dev Note that this method allows anyone to start a checkpoint as soon as a slashing occurs on the beacon
     * chain. This is intended to make it easier to external watchers to keep a pod's balance up to date.
     *
     * @dev Note too that beacon chain slashings are not instant. There is a delay between the initial slashing event
     * and the validator's final exit back to the execution layer. During this time, the validator's balance may or
     * may not drop further due to a correlation penalty. This method allows proof of a slashed validator
     * to initiate a checkpoint for as long as the validator remains on the beacon chain. Once the validator
     * has exited and been checkpointed at 0 balance, they are no longer "checkpoint-able" and cannot be proven
     * "stale" via this method.
     * See https://eth2book.info/capella/part3/transition/epoch/#slashings for more info.
     *
     * @param beaconTimestamp the beacon chain timestamp sent to the 4788 oracle contract. Corresponds
     * to the parent beacon block root against which the proof is verified.
     * @param stateRootProof proves a beacon state root against a beacon block root
     * @param proof the fields of the beacon chain "Validator" container, along with a merkle proof against
     * the beacon state root. See the consensus specs for more details:
     * https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator
     *
     * @dev Staleness conditions:
     * - Validator's last checkpoint is older than `beaconTimestamp`
     * - Validator MUST be in `ACTIVE` status in the pod
     * - Validator MUST be slashed on the beacon chain
     */
    function verifyStaleBalance(
        uint64 beaconTimestamp,
        BeaconChainProofs.StateRootProof calldata stateRootProof,
        BeaconChainProofs.ValidatorProof calldata proof
    ) external;

    /// @notice called by owner of a pod to remove any ERC20s deposited in the pod
    function recoverTokens(
        IERC20[] memory tokenList,
        uint256[] memory amountsToWithdraw,
        address recipient
    ) external;

    /// @notice Allows the owner of a pod to update the proof submitter, a permissioned
    /// address that can call `startCheckpoint` and `verifyWithdrawalCredentials`.
    /// @dev Note that EITHER the podOwner OR proofSubmitter can access these methods,
    /// so it's fine to set your proofSubmitter to 0 if you want the podOwner to be the
    /// only address that can call these methods.
    /// @param newProofSubmitter The new proof submitter address. If set to 0, only the
    /// pod owner will be able to call `startCheckpoint` and `verifyWithdrawalCredentials`
    function setProofSubmitter(address newProofSubmitter) external;

    /*******************************************************************************
                                   VIEW METHODS
    *******************************************************************************/

    /// @notice An address with permissions to call `startCheckpoint` and `verifyWithdrawalCredentials`, set
    /// by the podOwner. This role exists to allow a podOwner to designate a hot wallet that can call
    /// these methods, allowing the podOwner to remain a cold wallet that is only used to manage funds.
    /// @dev If this address is NOT set, only the podOwner can call `startCheckpoint` and `verifyWithdrawalCredentials`
    function proofSubmitter() external view returns (address);

    /// @notice the amount of execution layer ETH in this contract that is staked in EigenLayer (i.e. withdrawn from beaconchain but not EigenLayer),
    function withdrawableRestakedExecutionLayerGwei() external view returns (uint64);

    /// @notice The single EigenPodManager for EigenLayer
    function eigenPodManager() external view returns (IEigenPodManager);

    /// @notice The owner of this EigenPod
    function podOwner() external view returns (address);

    /// @notice Returns the validatorInfo struct for the provided pubkeyHash
    function validatorPubkeyHashToInfo(
        bytes32 validatorPubkeyHash
    ) external view returns (ValidatorInfo memory);

    /// @notice Returns the validatorInfo struct for the provided pubkey
    function validatorPubkeyToInfo(
        bytes calldata validatorPubkey
    ) external view returns (ValidatorInfo memory);

    /// @notice This returns the status of a given validator
    function validatorStatus(bytes32 pubkeyHash) external view returns (VALIDATOR_STATUS);

    /// @notice This returns the status of a given validator pubkey
    function validatorStatus(
        bytes calldata validatorPubkey
    ) external view returns (VALIDATOR_STATUS);

    /// @notice Number of validators with proven withdrawal credentials, who do not have proven full withdrawals
    function activeValidatorCount() external view returns (uint256);

    /// @notice The timestamp of the last checkpoint finalized
    function lastCheckpointTimestamp() external view returns (uint64);

    /// @notice The timestamp of the currently-active checkpoint. Will be 0 if there is not active checkpoint
    function currentCheckpointTimestamp() external view returns (uint64);

    /// @notice Returns the currently-active checkpoint
    function currentCheckpoint() external view returns (Checkpoint memory);

    /// @notice For each checkpoint, the total balance attributed to exited validators, in gwei
    ///
    /// NOTE that the values added to this mapping are NOT guaranteed to capture the entirety of a validator's
    /// exit - rather, they capture the total change in a validator's balance when a checkpoint shows their
    /// balance change from nonzero to zero. While a change from nonzero to zero DOES guarantee that a validator
    /// has been fully exited, it is possible that the magnitude of this change does not capture what is
    /// typically thought of as a "full exit."
    ///
    /// For example:
    /// 1. Consider a validator was last checkpointed at 32 ETH before exiting. Once the exit has been processed,
    /// it is expected that the validator's exited balance is calculated to be `32 ETH`.
    /// 2. However, before `startCheckpoint` is called, a deposit is made to the validator for 1 ETH. The beacon
    /// chain will automatically withdraw this ETH, but not until the withdrawal sweep passes over the validator
    /// again. Until this occurs, the validator's current balance (used for checkpointing) is 1 ETH.
    /// 3. If `startCheckpoint` is called at this point, the balance delta calculated for this validator will be
    /// `-31 ETH`, and because the validator has a nonzero balance, it is not marked WITHDRAWN.
    /// 4. After the exit is processed by the beacon chain, a subsequent `startCheckpoint` and checkpoint proof
    /// will calculate a balance delta of `-1 ETH` and attribute a 1 ETH exit to the validator.
    ///
    /// If this edge case impacts your usecase, it should be possible to mitigate this by monitoring for deposits
    /// to your exited validators, and waiting to call `startCheckpoint` until those deposits have been automatically
    /// exited.
    ///
    /// Additional edge cases this mapping does not cover:
    /// - If a validator is slashed, their balance exited will reflect their original balance rather than the slashed amount
    /// - The final partial withdrawal for an exited validator will be likely be included in this mapping.
    ///   i.e. if a validator was last checkpointed at 32.1 ETH before exiting, the next checkpoint will calculate their
    ///   "exited" amount to be 32.1 ETH rather than 32 ETH.
    function checkpointBalanceExitedGwei(uint64) external view returns (uint64);

    /// @notice Query the 4788 oracle to get the parent block root of the slot with the given `timestamp`
    /// @param timestamp of the block for which the parent block root will be returned. MUST correspond
    /// to an existing slot within the last 24 hours. If the slot at `timestamp` was skipped, this method
    /// will revert.
    function getParentBlockRoot(uint64 timestamp) external view returns (bytes32);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

import "@openzeppelin/contracts/proxy/beacon/IBeacon.sol";
import "./IETHPOSDeposit.sol";
import "./IStrategyManager.sol";
import "./IEigenPod.sol";
import "./IPausable.sol";
import "./ISlasher.sol";
import "./IStrategy.sol";

/**
 * @title Interface for factory that creates and manages solo staking pods that have their withdrawal credentials pointed to EigenLayer.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 */

interface IEigenPodManager is IPausable {
    /// @notice Emitted to notify the deployment of an EigenPod
    event PodDeployed(address indexed eigenPod, address indexed podOwner);

    /// @notice Emitted to notify a deposit of beacon chain ETH recorded in the strategy manager
    event BeaconChainETHDeposited(address indexed podOwner, uint256 amount);

    /// @notice Emitted when the balance of an EigenPod is updated
    event PodSharesUpdated(address indexed podOwner, int256 sharesDelta);

    /// @notice Emitted when a withdrawal of beacon chain ETH is completed
    event BeaconChainETHWithdrawalCompleted(
        address indexed podOwner,
        uint256 shares,
        uint96 nonce,
        address delegatedAddress,
        address withdrawer,
        bytes32 withdrawalRoot
    );

    /**
     * @notice Creates an EigenPod for the sender.
     * @dev Function will revert if the `msg.sender` already has an EigenPod.
     * @dev Returns EigenPod address
     */
    function createPod() external returns (address);

    /**
     * @notice Stakes for a new beacon chain validator on the sender's EigenPod.
     * Also creates an EigenPod for the sender if they don't have one already.
     * @param pubkey The 48 bytes public key of the beacon chain validator.
     * @param signature The validator's signature of the deposit data.
     * @param depositDataRoot The root/hash of the deposit data for the validator's deposit.
     */
    function stake(
        bytes calldata pubkey,
        bytes calldata signature,
        bytes32 depositDataRoot
    ) external payable;

    /**
     * @notice Changes the `podOwner`'s shares by `sharesDelta` and performs a call to the DelegationManager
     * to ensure that delegated shares are also tracked correctly
     * @param podOwner is the pod owner whose balance is being updated.
     * @param sharesDelta is the change in podOwner's beaconChainETHStrategy shares
     * @dev Callable only by the podOwner's EigenPod contract.
     * @dev Reverts if `sharesDelta` is not a whole Gwei amount
     */
    function recordBeaconChainETHBalanceUpdate(address podOwner, int256 sharesDelta) external;

    /// @notice Returns the address of the `podOwner`'s EigenPod if it has been deployed.
    function ownerToPod(address podOwner) external view returns (IEigenPod);

    /// @notice Returns the address of the `podOwner`'s EigenPod (whether it is deployed yet or not).
    function getPod(address podOwner) external view returns (IEigenPod);

    /// @notice The ETH2 Deposit Contract
    function ethPOS() external view returns (IETHPOSDeposit);

    /// @notice Beacon proxy to which the EigenPods point
    function eigenPodBeacon() external view returns (IBeacon);

    /// @notice EigenLayer's StrategyManager contract
    function strategyManager() external view returns (IStrategyManager);

    /// @notice EigenLayer's Slasher contract
    function slasher() external view returns (ISlasher);

    /// @notice Returns 'true' if the `podOwner` has created an EigenPod, and 'false' otherwise.
    function hasPod(address podOwner) external view returns (bool);

    /// @notice Returns the number of EigenPods that have been created
    function numPods() external view returns (uint256);

    /**
     * @notice Mapping from Pod owner owner to the number of shares they have in the virtual beacon chain ETH strategy.
     * @dev The share amount can become negative. This is necessary to accommodate the fact that a pod owner's virtual beacon chain ETH shares can
     * decrease between the pod owner queuing and completing a withdrawal.
     * When the pod owner's shares would otherwise increase, this "deficit" is decreased first _instead_.
     * Likewise, when a withdrawal is completed, this "deficit" is decreased and the withdrawal amount is decreased; We can think of this
     * as the withdrawal "paying off the deficit".
     */
    function podOwnerShares(address podOwner) external view returns (int256);

    /// @notice returns canonical, virtual beaconChainETH strategy
    function beaconChainETHStrategy() external view returns (IStrategy);

    /**
     * @notice Used by the DelegationManager to remove a pod owner's shares while they're in the withdrawal queue.
     * Simply decreases the `podOwner`'s shares by `shares`, down to a minimum of zero.
     * @dev This function reverts if it would result in `podOwnerShares[podOwner]` being less than zero, i.e. it is forbidden for this function to
     * result in the `podOwner` incurring a "share deficit". This behavior prevents a Staker from queuing a withdrawal which improperly removes excessive
     * shares from the operator to whom the staker is delegated.
     * @dev Reverts if `shares` is not a whole Gwei amount
     */
    function removeShares(address podOwner, uint256 shares) external;

    /**
     * @notice Increases the `podOwner`'s shares by `shares`, paying off deficit if possible.
     * Used by the DelegationManager to award a pod owner shares on exiting the withdrawal queue
     * @dev Returns the number of shares added to `podOwnerShares[podOwner]` above zero, which will be less than the `shares` input
     * in the event that the podOwner has an existing shares deficit (i.e. `podOwnerShares[podOwner]` starts below zero)
     * @dev Reverts if `shares` is not a whole Gwei amount
     */
    function addShares(address podOwner, uint256 shares) external returns (uint256);

    /**
     * @notice Used by the DelegationManager to complete a withdrawal, sending tokens to some destination address
     * @dev Prioritizes decreasing the podOwner's share deficit, if they have one
     * @dev Reverts if `shares` is not a whole Gwei amount
     */
    function withdrawSharesAsTokens(address podOwner, address destination, uint256 shares) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

import "../interfaces/IPauserRegistry.sol";

/**
 * @title Adds pausability to a contract, with pausing & unpausing controlled by the `pauser` and `unpauser` of a PauserRegistry contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice Contracts that inherit from this contract may define their own `pause` and `unpause` (and/or related) functions.
 * These functions should be permissioned as "onlyPauser" which defers to a `PauserRegistry` for determining access control.
 * @dev Pausability is implemented using a uint256, which allows up to 256 different single bit-flags; each bit can potentially pause different functionality.
 * Inspiration for this was taken from the NearBridge design here https://etherscan.io/address/0x3FEFc5A4B1c02f21cBc8D3613643ba0635b9a873#code.
 * For the `pause` and `unpause` functions we've implemented, if you pause, you can only flip (any number of) switches to on/1 (aka "paused"), and if you unpause,
 * you can only flip (any number of) switches to off/0 (aka "paused").
 * If you want a pauseXYZ function that just flips a single bit / "pausing flag", it will:
 * 1) 'bit-wise and' (aka `&`) a flag with the current paused state (as a uint256)
 * 2) update the paused state to this new value
 * @dev We note as well that we have chosen to identify flags by their *bit index* as opposed to their numerical value, so, e.g. defining `DEPOSITS_PAUSED = 3`
 * indicates specifically that if the *third bit* of `_paused` is flipped -- i.e. it is a '1' -- then deposits should be paused
 */

interface IPausable {
    /// @notice Emitted when the `pauserRegistry` is set to `newPauserRegistry`.
    event PauserRegistrySet(IPauserRegistry pauserRegistry, IPauserRegistry newPauserRegistry);

    /// @notice Emitted when the pause is triggered by `account`, and changed to `newPausedStatus`.
    event Paused(address indexed account, uint256 newPausedStatus);

    /// @notice Emitted when the pause is lifted by `account`, and changed to `newPausedStatus`.
    event Unpaused(address indexed account, uint256 newPausedStatus);

    /// @notice Address of the `PauserRegistry` contract that this contract defers to for determining access control (for pausing).
    function pauserRegistry() external view returns (IPauserRegistry);

    /**
     * @notice This function is used to pause an EigenLayer contract's functionality.
     * It is permissioned to the `pauser` address, which is expected to be a low threshold multisig.
     * @param newPausedStatus represents the new value for `_paused` to take, which means it may flip several bits at once.
     * @dev This function can only pause functionality, and thus cannot 'unflip' any bit in `_paused` from 1 to 0.
     */
    function pause(uint256 newPausedStatus) external;

    /**
     * @notice Alias for `pause(type(uint256).max)`.
     */
    function pauseAll() external;

    /**
     * @notice This function is used to unpause an EigenLayer contract's functionality.
     * It is permissioned to the `unpauser` address, which is expected to be a high threshold multisig or governance contract.
     * @param newPausedStatus represents the new value for `_paused` to take, which means it may flip several bits at once.
     * @dev This function can only unpause functionality, and thus cannot 'flip' any bit in `_paused` from 0 to 1.
     */
    function unpause(uint256 newPausedStatus) external;

    /// @notice Returns the current paused status as a uint256.
    function paused() external view returns (uint256);

    /// @notice Returns 'true' if the `indexed`th bit of `_paused` is 1, and 'false' otherwise
    function paused(uint8 index) external view returns (bool);

    /// @notice Allows the unpauser to set a new pauser registry
    function setPauserRegistry(IPauserRegistry newPauserRegistry) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

/**
 * @title Interface for the `PauserRegistry` contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 */
interface IPauserRegistry {
    event PauserStatusChanged(address pauser, bool canPause);

    event UnpauserChanged(address previousUnpauser, address newUnpauser);

    /// @notice Mapping of addresses to whether they hold the pauser role.
    function isPauser(address pauser) external view returns (bool);

    /// @notice Unique address that holds the unpauser role. Capable of changing *both* the pauser and unpauser addresses.
    function unpauser() external view returns (address);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.12;

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

/**
 * @title Interface for the `IRewardsCoordinator` contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice Allows AVSs to make "Rewards Submissions", which get distributed amongst the AVSs' confirmed
 * Operators and the Stakers delegated to those Operators.
 * Calculations are performed based on the completed RewardsSubmission, with the results posted in
 * a Merkle root against which Stakers & Operators can make claims.
 */
interface IRewardsCoordinator {
    /// STRUCTS ///
    /**
     * @notice A linear combination of strategies and multipliers for AVSs to weigh
     * EigenLayer strategies.
     * @param strategy The EigenLayer strategy to be used for the rewards submission
     * @param multiplier The weight of the strategy in the rewards submission
     */
    struct StrategyAndMultiplier {
        IStrategy strategy;
        uint96 multiplier;
    }

    /**
     * Sliding Window for valid RewardsSubmission startTimestamp
     *
     * Scenario A: GENESIS_REWARDS_TIMESTAMP IS WITHIN RANGE
     *         <-----MAX_RETROACTIVE_LENGTH-----> t (block.timestamp) <---MAX_FUTURE_LENGTH--->
     *             <--------------------valid range for startTimestamp------------------------>
     *             ^
     *         GENESIS_REWARDS_TIMESTAMP
     *
     *
     * Scenario B: GENESIS_REWARDS_TIMESTAMP IS OUT OF RANGE
     *         <-----MAX_RETROACTIVE_LENGTH-----> t (block.timestamp) <---MAX_FUTURE_LENGTH--->
     *         <------------------------valid range for startTimestamp------------------------>
     *     ^
     * GENESIS_REWARDS_TIMESTAMP
     * @notice RewardsSubmission struct submitted by AVSs when making rewards for their operators and stakers
     * RewardsSubmission can be for a time range within the valid window for startTimestamp and must be within max duration.
     * See `createAVSRewardsSubmission()` for more details.
     * @param strategiesAndMultipliers The strategies and their relative weights
     * cannot have duplicate strategies and need to be sorted in ascending address order
     * @param token The rewards token to be distributed
     * @param amount The total amount of tokens to be distributed
     * @param startTimestamp The timestamp (seconds) at which the submission range is considered for distribution
     * could start in the past or in the future but within a valid range. See the diagram above.
     * @param duration The duration of the submission range in seconds. Must be <= MAX_REWARDS_DURATION
     */
    struct RewardsSubmission {
        StrategyAndMultiplier[] strategiesAndMultipliers;
        IERC20 token;
        uint256 amount;
        uint32 startTimestamp;
        uint32 duration;
    }

    /**
     * @notice A distribution root is a merkle root of the distribution of earnings for a given period.
     * The RewardsCoordinator stores all historical distribution roots so that earners can claim their earnings against older roots
     * if they wish but the merkle tree contains the cumulative earnings of all earners and tokens for a given period so earners (or their claimers if set)
     * only need to claim against the latest root to claim all available earnings.
     * @param root The merkle root of the distribution
     * @param rewardsCalculationEndTimestamp The timestamp (seconds) until which rewards have been calculated
     * @param activatedAt The timestamp (seconds) at which the root can be claimed against
     */
    struct DistributionRoot {
        bytes32 root;
        uint32 rewardsCalculationEndTimestamp;
        uint32 activatedAt;
    }

    /**
     * @notice Internal leaf in the merkle tree for the earner's account leaf
     * @param earner The address of the earner
     * @param earnerTokenRoot The merkle root of the earner's token subtree
     * Each leaf in the earner's token subtree is a TokenTreeMerkleLeaf
     */

    struct EarnerTreeMerkleLeaf {
        address earner;
        bytes32 earnerTokenRoot;
    }

    /**
     * @notice The actual leaves in the distribution merkle tree specifying the token earnings
     * for the respective earner's subtree. Each leaf is a claimable amount of a token for an earner.
     * @param token The token for which the earnings are being claimed
     * @param cumulativeEarnings The cumulative earnings of the earner for the token
     */
    struct TokenTreeMerkleLeaf {
        IERC20 token;
        uint256 cumulativeEarnings;
    }

    /**
     * @notice A claim against a distribution root called by an
     * earners claimer (could be the earner themselves). Each token claim will claim the difference
     * between the cumulativeEarnings of the earner and the cumulativeClaimed of the claimer.
     * Each claim can specify which of the earner's earned tokens they want to claim.
     * See `processClaim()` for more details.
     * @param rootIndex The index of the root in the list of DistributionRoots
     * @param earnerIndex The index of the earner's account root in the merkle tree
     * @param earnerTreeProof The proof of the earner's EarnerTreeMerkleLeaf against the merkle root
     * @param earnerLeaf The earner's EarnerTreeMerkleLeaf struct, providing the earner address and earnerTokenRoot
     * @param tokenIndices The indices of the token leaves in the earner's subtree
     * @param tokenTreeProofs The proofs of the token leaves against the earner's earnerTokenRoot
     * @param tokenLeaves The token leaves to be claimed
     * @dev The merkle tree is structured with the merkle root at the top and EarnerTreeMerkleLeaf as internal leaves
     * in the tree. Each earner leaf has its own subtree with TokenTreeMerkleLeaf as leaves in the subtree.
     * To prove a claim against a specified rootIndex(which specifies the distributionRoot being used),
     * the claim will first verify inclusion of the earner leaf in the tree against distributionRoots[rootIndex].root.
     * Then for each token, it will verify inclusion of the token leaf in the earner's subtree against the earner's earnerTokenRoot.
     */
    struct RewardsMerkleClaim {
        uint32 rootIndex;
        uint32 earnerIndex;
        bytes earnerTreeProof;
        EarnerTreeMerkleLeaf earnerLeaf;
        uint32[] tokenIndices;
        bytes[] tokenTreeProofs;
        TokenTreeMerkleLeaf[] tokenLeaves;
    }

    /// EVENTS ///

    /// @notice emitted when an AVS creates a valid RewardsSubmission
    event AVSRewardsSubmissionCreated(
        address indexed avs,
        uint256 indexed submissionNonce,
        bytes32 indexed rewardsSubmissionHash,
        RewardsSubmission rewardsSubmission
    );
    /// @notice emitted when a valid RewardsSubmission is created for all stakers by a valid submitter
    event RewardsSubmissionForAllCreated(
        address indexed submitter,
        uint256 indexed submissionNonce,
        bytes32 indexed rewardsSubmissionHash,
        RewardsSubmission rewardsSubmission
    );
    /// @notice rewardsUpdater is responsible for submiting DistributionRoots, only owner can set rewardsUpdater
    event RewardsUpdaterSet(address indexed oldRewardsUpdater, address indexed newRewardsUpdater);
    event RewardsForAllSubmitterSet(
        address indexed rewardsForAllSubmitter,
        bool indexed oldValue,
        bool indexed newValue
    );
    event ActivationDelaySet(uint32 oldActivationDelay, uint32 newActivationDelay);
    event GlobalCommissionBipsSet(uint16 oldGlobalCommissionBips, uint16 newGlobalCommissionBips);
    event ClaimerForSet(
        address indexed earner,
        address indexed oldClaimer,
        address indexed claimer
    );
    /// @notice rootIndex is the specific array index of the newly created root in the storage array
    event DistributionRootSubmitted(
        uint32 indexed rootIndex,
        bytes32 indexed root,
        uint32 indexed rewardsCalculationEndTimestamp,
        uint32 activatedAt
    );
    /// @notice root is one of the submitted distribution roots that was claimed against
    event RewardsClaimed(
        bytes32 root,
        address indexed earner,
        address indexed claimer,
        address indexed recipient,
        IERC20 token,
        uint256 claimedAmount
    );

    /*******************************************************************************
                            VIEW FUNCTIONS
    *******************************************************************************/

    /// @notice The address of the entity that can update the contract with new merkle roots
    function rewardsUpdater() external view returns (address);

    /**
     * @notice The interval in seconds at which the calculation for a RewardsSubmission distribution is done.
     * @dev Rewards Submission durations must be multiples of this interval.
     */
    function CALCULATION_INTERVAL_SECONDS() external view returns (uint32);

    /// @notice The maximum amount of time (seconds) that a RewardsSubmission can span over
    function MAX_REWARDS_DURATION() external view returns (uint32);

    /// @notice max amount of time (seconds) that a submission can start in the past
    function MAX_RETROACTIVE_LENGTH() external view returns (uint32);

    /// @notice max amount of time (seconds) that a submission can start in the future
    function MAX_FUTURE_LENGTH() external view returns (uint32);

    /// @notice absolute min timestamp (seconds) that a submission can start at
    function GENESIS_REWARDS_TIMESTAMP() external view returns (uint32);

    /// @notice Delay in timestamp (seconds) before a posted root can be claimed against
    function activationDelay() external view returns (uint32);

    /// @notice Mapping: earner => the address of the entity who can call `processClaim` on behalf of the earner
    function claimerFor(address earner) external view returns (address);

    /// @notice Mapping: claimer => token => total amount claimed
    function cumulativeClaimed(address claimer, IERC20 token) external view returns (uint256);

    /// @notice the commission for all operators across all avss
    function globalOperatorCommissionBips() external view returns (uint16);

    /// @notice the commission for a specific operator for a specific avs
    /// NOTE: Currently unused and simply returns the globalOperatorCommissionBips value but will be used in future release
    function operatorCommissionBips(address operator, address avs) external view returns (uint16);

    /// @notice return the hash of the earner's leaf
    function calculateEarnerLeafHash(
        EarnerTreeMerkleLeaf calldata leaf
    ) external pure returns (bytes32);

    /// @notice returns the hash of the earner's token leaf
    function calculateTokenLeafHash(
        TokenTreeMerkleLeaf calldata leaf
    ) external pure returns (bytes32);

    /// @notice returns 'true' if the claim would currently pass the check in `processClaims`
    /// but will revert if not valid
    function checkClaim(RewardsMerkleClaim calldata claim) external view returns (bool);

    /// @notice The timestamp until which RewardsSubmissions have been calculated
    function currRewardsCalculationEndTimestamp() external view returns (uint32);

    /// @notice loop through distribution roots from reverse and return hash
    function getRootIndexFromHash(bytes32 rootHash) external view returns (uint32);

    /// @notice returns the number of distribution roots posted
    function getDistributionRootsLength() external view returns (uint256);

    /*******************************************************************************
                            EXTERNAL FUNCTIONS 
    *******************************************************************************/

    /**
     * @notice Creates a new rewards submission on behalf of an AVS, to be split amongst the
     * set of stakers delegated to operators who are registered to the `avs`
     * @param rewardsSubmissions The rewards submissions being created
     * @dev Expected to be called by the ServiceManager of the AVS on behalf of which the submission is being made
     * @dev The duration of the `rewardsSubmission` cannot exceed `MAX_REWARDS_DURATION`
     * @dev The tokens are sent to the `RewardsCoordinator` contract
     * @dev Strategies must be in ascending order of addresses to check for duplicates
     * @dev This function will revert if the `rewardsSubmission` is malformed,
     * e.g. if the `strategies` and `weights` arrays are of non-equal lengths
     */
    function createAVSRewardsSubmission(RewardsSubmission[] calldata rewardsSubmissions) external;

    /**
     * @notice similar to `createAVSRewardsSubmission` except the rewards are split amongst *all* stakers
     * rather than just those delegated to operators who are registered to a single avs and is
     * a permissioned call based on isRewardsForAllSubmitter mapping.
     */
    function createRewardsForAllSubmission(RewardsSubmission[] calldata rewardsSubmission) external;

    /**
     * @notice Claim rewards against a given root (read from distributionRoots[claim.rootIndex]).
     * Earnings are cumulative so earners don't have to claim against all distribution roots they have earnings for,
     * they can simply claim against the latest root and the contract will calculate the difference between
     * their cumulativeEarnings and cumulativeClaimed. This difference is then transferred to recipient address.
     * @param claim The RewardsMerkleClaim to be processed.
     * Contains the root index, earner, token leaves, and required proofs
     * @param recipient The address recipient that receives the ERC20 rewards
     * @dev only callable by the valid claimer, that is
     * if claimerFor[claim.earner] is address(0) then only the earner can claim, otherwise only
     * claimerFor[claim.earner] can claim the rewards.
     */
    function processClaim(RewardsMerkleClaim calldata claim, address recipient) external;

    /**
     * @notice Creates a new distribution root. activatedAt is set to block.timestamp + activationDelay
     * @param root The merkle root of the distribution
     * @param rewardsCalculationEndTimestamp The timestamp (seconds) until which rewards have been calculated
     * @dev Only callable by the rewardsUpdater
     */
    function submitRoot(bytes32 root, uint32 rewardsCalculationEndTimestamp) external;

    /**
     * @notice Sets the address of the entity that can call `processClaim` on behalf of the earner (msg.sender)
     * @param claimer The address of the entity that can claim rewards on behalf of the earner
     * @dev Only callable by the `earner`
     */
    function setClaimerFor(address claimer) external;

    /**
     * @notice Sets the delay in timestamp before a posted root can be claimed against
     * @param _activationDelay Delay in timestamp (seconds) before a posted root can be claimed against
     * @dev Only callable by the contract owner
     */
    function setActivationDelay(uint32 _activationDelay) external;

    /**
     * @notice Sets the global commission for all operators across all avss
     * @param _globalCommissionBips The commission for all operators across all avss
     * @dev Only callable by the contract owner
     */
    function setGlobalOperatorCommission(uint16 _globalCommissionBips) external;

    /**
     * @notice Sets the permissioned `rewardsUpdater` address which can post new roots
     * @dev Only callable by the contract owner
     */
    function setRewardsUpdater(address _rewardsUpdater) external;

    /**
     * @notice Sets the permissioned `rewardsForAllSubmitter` address which can submit createRewardsForAllSubmission
     * @dev Only callable by the contract owner
     * @param _submitter The address of the rewardsForAllSubmitter
     * @param _newValue The new value for isRewardsForAllSubmitter
     */
    function setRewardsForAllSubmitter(address _submitter, bool _newValue) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

/**
 * @title The interface for common signature utilities.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 */
interface ISignatureUtils {
    // @notice Struct that bundles together a signature and an expiration time for the signature. Used primarily for stack management.
    struct SignatureWithExpiry {
        // the signature itself, formatted as a single bytes object
        bytes signature;
        // the expiration timestamp (UTC) of the signature
        uint256 expiry;
    }

    // @notice Struct that bundles together a signature, a salt for uniqueness, and an expiration time for the signature. Used primarily for stack management.
    struct SignatureWithSaltAndExpiry {
        // the signature itself, formatted as a single bytes object
        bytes signature;
        // the salt used to generate the signature
        bytes32 salt;
        // the expiration timestamp (UTC) of the signature
        uint256 expiry;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

import "./IStrategyManager.sol";
import "./IDelegationManager.sol";

/**
 * @title Interface for the primary 'slashing' contract for EigenLayer.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice See the `Slasher` contract itself for implementation details.
 */
interface ISlasher {
    // struct used to store information about the current state of an operator's obligations to middlewares they are serving
    struct MiddlewareTimes {
        // The update block for the middleware whose most recent update was earliest, i.e. the 'stalest' update out of all middlewares the operator is serving
        uint32 stalestUpdateBlock;
        // The latest 'serveUntilBlock' from all of the middleware that the operator is serving
        uint32 latestServeUntilBlock;
    }

    // struct used to store details relevant to a single middleware that an operator has opted-in to serving
    struct MiddlewareDetails {
        // the block at which the contract begins being able to finalize the operator's registration with the service via calling `recordFirstStakeUpdate`
        uint32 registrationMayBeginAtBlock;
        // the block before which the contract is allowed to slash the user
        uint32 contractCanSlashOperatorUntilBlock;
        // the block at which the middleware's view of the operator's stake was most recently updated
        uint32 latestUpdateBlock;
    }

    /// @notice Emitted when a middleware times is added to `operator`'s array.
    event MiddlewareTimesAdded(
        address operator,
        uint256 index,
        uint32 stalestUpdateBlock,
        uint32 latestServeUntilBlock
    );

    /// @notice Emitted when `operator` begins to allow `contractAddress` to slash them.
    event OptedIntoSlashing(address indexed operator, address indexed contractAddress);

    /// @notice Emitted when `contractAddress` signals that it will no longer be able to slash `operator` after the `contractCanSlashOperatorUntilBlock`.
    event SlashingAbilityRevoked(
        address indexed operator,
        address indexed contractAddress,
        uint32 contractCanSlashOperatorUntilBlock
    );

    /**
     * @notice Emitted when `slashingContract` 'freezes' the `slashedOperator`.
     * @dev The `slashingContract` must have permission to slash the `slashedOperator`, i.e. `canSlash(slasherOperator, slashingContract)` must return 'true'.
     */
    event OperatorFrozen(address indexed slashedOperator, address indexed slashingContract);

    /// @notice Emitted when `previouslySlashedAddress` is 'unfrozen', allowing them to again move deposited funds within EigenLayer.
    event FrozenStatusReset(address indexed previouslySlashedAddress);

    /**
     * @notice Gives the `contractAddress` permission to slash the funds of the caller.
     * @dev Typically, this function must be called prior to registering for a middleware.
     */
    function optIntoSlashing(address contractAddress) external;

    /**
     * @notice Used for 'slashing' a certain operator.
     * @param toBeFrozen The operator to be frozen.
     * @dev Technically the operator is 'frozen' (hence the name of this function), and then subject to slashing pending a decision by a human-in-the-loop.
     * @dev The operator must have previously given the caller (which should be a contract) the ability to slash them, through a call to `optIntoSlashing`.
     */
    function freezeOperator(address toBeFrozen) external;

    /**
     * @notice Removes the 'frozen' status from each of the `frozenAddresses`
     * @dev Callable only by the contract owner (i.e. governance).
     */
    function resetFrozenStatus(address[] calldata frozenAddresses) external;

    /**
     * @notice this function is a called by middlewares during an operator's registration to make sure the operator's stake at registration
     *         is slashable until serveUntil
     * @param operator the operator whose stake update is being recorded
     * @param serveUntilBlock the block until which the operator's stake at the current block is slashable
     * @dev adds the middleware's slashing contract to the operator's linked list
     */
    function recordFirstStakeUpdate(address operator, uint32 serveUntilBlock) external;

    /**
     * @notice this function is a called by middlewares during a stake update for an operator (perhaps to free pending withdrawals)
     *         to make sure the operator's stake at updateBlock is slashable until serveUntil
     * @param operator the operator whose stake update is being recorded
     * @param updateBlock the block for which the stake update is being recorded
     * @param serveUntilBlock the block until which the operator's stake at updateBlock is slashable
     * @param insertAfter the element of the operators linked list that the currently updating middleware should be inserted after
     * @dev insertAfter should be calculated offchain before making the transaction that calls this. this is subject to race conditions,
     *      but it is anticipated to be rare and not detrimental.
     */
    function recordStakeUpdate(
        address operator,
        uint32 updateBlock,
        uint32 serveUntilBlock,
        uint256 insertAfter
    ) external;

    /**
     * @notice this function is a called by middlewares during an operator's deregistration to make sure the operator's stake at deregistration
     *         is slashable until serveUntil
     * @param operator the operator whose stake update is being recorded
     * @param serveUntilBlock the block until which the operator's stake at the current block is slashable
     * @dev removes the middleware's slashing contract to the operator's linked list and revokes the middleware's (i.e. caller's) ability to
     * slash `operator` once `serveUntil` is reached
     */
    function recordLastStakeUpdateAndRevokeSlashingAbility(
        address operator,
        uint32 serveUntilBlock
    ) external;

    /// @notice The StrategyManager contract of EigenLayer
    function strategyManager() external view returns (IStrategyManager);

    /// @notice The DelegationManager contract of EigenLayer
    function delegation() external view returns (IDelegationManager);

    /**
     * @notice Used to determine whether `staker` is actively 'frozen'. If a staker is frozen, then they are potentially subject to
     * slashing of their funds, and cannot cannot deposit or withdraw from the strategyManager until the slashing process is completed
     * and the staker's status is reset (to 'unfrozen').
     * @param staker The staker of interest.
     * @return Returns 'true' if `staker` themselves has their status set to frozen, OR if the staker is delegated
     * to an operator who has their status set to frozen. Otherwise returns 'false'.
     */
    function isFrozen(address staker) external view returns (bool);

    /// @notice Returns true if `slashingContract` is currently allowed to slash `toBeSlashed`.
    function canSlash(address toBeSlashed, address slashingContract) external view returns (bool);

    /// @notice Returns the block until which `serviceContract` is allowed to slash the `operator`.
    function contractCanSlashOperatorUntilBlock(
        address operator,
        address serviceContract
    ) external view returns (uint32);

    /// @notice Returns the block at which the `serviceContract` last updated its view of the `operator`'s stake
    function latestUpdateBlock(
        address operator,
        address serviceContract
    ) external view returns (uint32);

    /// @notice A search routine for finding the correct input value of `insertAfter` to `recordStakeUpdate` / `_updateMiddlewareList`.
    function getCorrectValueForInsertAfter(
        address operator,
        uint32 updateBlock
    ) external view returns (uint256);

    /**
     * @notice Returns 'true' if `operator` can currently complete a withdrawal started at the `withdrawalStartBlock`, with `middlewareTimesIndex` used
     * to specify the index of a `MiddlewareTimes` struct in the operator's list (i.e. an index in `operatorToMiddlewareTimes[operator]`). The specified
     * struct is consulted as proof of the `operator`'s ability (or lack thereof) to complete the withdrawal.
     * This function will return 'false' if the operator cannot currently complete a withdrawal started at the `withdrawalStartBlock`, *or* in the event
     * that an incorrect `middlewareTimesIndex` is supplied, even if one or more correct inputs exist.
     * @param operator Either the operator who queued the withdrawal themselves, or if the withdrawing party is a staker who delegated to an operator,
     * this address is the operator *who the staker was delegated to* at the time of the `withdrawalStartBlock`.
     * @param withdrawalStartBlock The block number at which the withdrawal was initiated.
     * @param middlewareTimesIndex Indicates an index in `operatorToMiddlewareTimes[operator]` to consult as proof of the `operator`'s ability to withdraw
     * @dev The correct `middlewareTimesIndex` input should be computable off-chain.
     */
    function canWithdraw(
        address operator,
        uint32 withdrawalStartBlock,
        uint256 middlewareTimesIndex
    ) external returns (bool);

    /**
     * operator =>
     *  [
     *      (
     *          the least recent update block of all of the middlewares it's serving/served,
     *          latest time that the stake bonded at that update needed to serve until
     *      )
     *  ]
     */
    function operatorToMiddlewareTimes(
        address operator,
        uint256 arrayIndex
    ) external view returns (MiddlewareTimes memory);

    /// @notice Getter function for fetching `operatorToMiddlewareTimes[operator].length`
    function middlewareTimesLength(address operator) external view returns (uint256);

    /// @notice Getter function for fetching `operatorToMiddlewareTimes[operator][index].stalestUpdateBlock`.
    function getMiddlewareTimesIndexStalestUpdateBlock(
        address operator,
        uint32 index
    ) external view returns (uint32);

    /// @notice Getter function for fetching `operatorToMiddlewareTimes[operator][index].latestServeUntil`.
    function getMiddlewareTimesIndexServeUntilBlock(
        address operator,
        uint32 index
    ) external view returns (uint32);

    /// @notice Getter function for fetching `_operatorToWhitelistedContractsByUpdate[operator].size`.
    function operatorWhitelistedContractsLinkedListSize(
        address operator
    ) external view returns (uint256);

    /// @notice Getter function for fetching a single node in the operator's linked list (`_operatorToWhitelistedContractsByUpdate[operator]`).
    function operatorWhitelistedContractsLinkedListEntry(
        address operator,
        address node
    ) external view returns (bool, uint256, uint256);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

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

/**
 * @title Minimal interface for an `Strategy` contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice Custom `Strategy` implementations may expand extensively on this interface.
 */
interface IStrategy {
    /**
     * @notice Used to deposit tokens into this Strategy
     * @param token is the ERC20 token being deposited
     * @param amount is the amount of token being deposited
     * @dev This function is only callable by the strategyManager contract. It is invoked inside of the strategyManager's
     * `depositIntoStrategy` function, and individual share balances are recorded in the strategyManager as well.
     * @return newShares is the number of new shares issued at the current exchange ratio.
     */
    function deposit(IERC20 token, uint256 amount) external returns (uint256);

    /**
     * @notice Used to withdraw tokens from this Strategy, to the `recipient`'s address
     * @param recipient is the address to receive the withdrawn funds
     * @param token is the ERC20 token being transferred out
     * @param amountShares is the amount of shares being withdrawn
     * @dev This function is only callable by the strategyManager contract. It is invoked inside of the strategyManager's
     * other functions, and individual share balances are recorded in the strategyManager as well.
     */
    function withdraw(address recipient, IERC20 token, uint256 amountShares) external;

    /**
     * @notice Used to convert a number of shares to the equivalent amount of underlying tokens for this strategy.
     * @notice In contrast to `sharesToUnderlyingView`, this function **may** make state modifications
     * @param amountShares is the amount of shares to calculate its conversion into the underlying token
     * @return The amount of underlying tokens corresponding to the input `amountShares`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function sharesToUnderlying(uint256 amountShares) external returns (uint256);

    /**
     * @notice Used to convert an amount of underlying tokens to the equivalent amount of shares in this strategy.
     * @notice In contrast to `underlyingToSharesView`, this function **may** make state modifications
     * @param amountUnderlying is the amount of `underlyingToken` to calculate its conversion into strategy shares
     * @return The amount of underlying tokens corresponding to the input `amountShares`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function underlyingToShares(uint256 amountUnderlying) external returns (uint256);

    /**
     * @notice convenience function for fetching the current underlying value of all of the `user`'s shares in
     * this strategy. In contrast to `userUnderlyingView`, this function **may** make state modifications
     */
    function userUnderlying(address user) external returns (uint256);

    /**
     * @notice convenience function for fetching the current total shares of `user` in this strategy, by
     * querying the `strategyManager` contract
     */
    function shares(address user) external view returns (uint256);

    /**
     * @notice Used to convert a number of shares to the equivalent amount of underlying tokens for this strategy.
     * @notice In contrast to `sharesToUnderlying`, this function guarantees no state modifications
     * @param amountShares is the amount of shares to calculate its conversion into the underlying token
     * @return The amount of shares corresponding to the input `amountUnderlying`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function sharesToUnderlyingView(uint256 amountShares) external view returns (uint256);

    /**
     * @notice Used to convert an amount of underlying tokens to the equivalent amount of shares in this strategy.
     * @notice In contrast to `underlyingToShares`, this function guarantees no state modifications
     * @param amountUnderlying is the amount of `underlyingToken` to calculate its conversion into strategy shares
     * @return The amount of shares corresponding to the input `amountUnderlying`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function underlyingToSharesView(uint256 amountUnderlying) external view returns (uint256);

    /**
     * @notice convenience function for fetching the current underlying value of all of the `user`'s shares in
     * this strategy. In contrast to `userUnderlying`, this function guarantees no state modifications
     */
    function userUnderlyingView(address user) external view returns (uint256);

    /// @notice The underlying token for shares in this Strategy
    function underlyingToken() external view returns (IERC20);

    /// @notice The total number of extant shares in this Strategy
    function totalShares() external view returns (uint256);

    /// @notice Returns either a brief string explaining the strategy's goal & purpose, or a link to metadata that explains in more detail.
    function explanation() external view returns (string memory);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

import "./IStrategy.sol";
import "./ISlasher.sol";
import "./IDelegationManager.sol";
import "./IEigenPodManager.sol";

/**
 * @title Interface for the primary entrypoint for funds into EigenLayer.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice See the `StrategyManager` contract itself for implementation details.
 */
interface IStrategyManager {
    // Access to public vars - hack locally
    function stakerStrategyList(address staker, uint256 index) external view returns (IStrategy);
    function strategyIsWhitelistedForDeposit(IStrategy _strategy) external view returns (bool);

    /**
     * @notice Emitted when a new deposit occurs on behalf of `staker`.
     * @param staker Is the staker who is depositing funds into EigenLayer.
     * @param strategy Is the strategy that `staker` has deposited into.
     * @param token Is the token that `staker` deposited.
     * @param shares Is the number of new shares `staker` has been granted in `strategy`.
     */
    event Deposit(address staker, IERC20 token, IStrategy strategy, uint256 shares);

    /// @notice Emitted when `thirdPartyTransfersForbidden` is updated for a strategy and value by the owner
    event UpdatedThirdPartyTransfersForbidden(IStrategy strategy, bool value);

    /// @notice Emitted when the `strategyWhitelister` is changed
    event StrategyWhitelisterChanged(address previousAddress, address newAddress);

    /// @notice Emitted when a strategy is added to the approved list of strategies for deposit
    event StrategyAddedToDepositWhitelist(IStrategy strategy);

    /// @notice Emitted when a strategy is removed from the approved list of strategies for deposit
    event StrategyRemovedFromDepositWhitelist(IStrategy strategy);

    /**
     * @notice Deposits `amount` of `token` into the specified `strategy`, with the resultant shares credited to `msg.sender`
     * @param strategy is the specified strategy where deposit is to be made,
     * @param token is the denomination in which the deposit is to be made,
     * @param amount is the amount of token to be deposited in the strategy by the staker
     * @return shares The amount of new shares in the `strategy` created as part of the action.
     * @dev The `msg.sender` must have previously approved this contract to transfer at least `amount` of `token` on their behalf.
     * @dev Cannot be called by an address that is 'frozen' (this function will revert if the `msg.sender` is frozen).
     *
     * WARNING: Depositing tokens that allow reentrancy (eg. ERC-777) into a strategy is not recommended.  This can lead to attack vectors
     *          where the token balance and corresponding strategy shares are not in sync upon reentrancy.
     */
    function depositIntoStrategy(
        IStrategy strategy,
        IERC20 token,
        uint256 amount
    ) external returns (uint256 shares);

    /**
     * @notice Used for depositing an asset into the specified strategy with the resultant shares credited to `staker`,
     * who must sign off on the action.
     * Note that the assets are transferred out/from the `msg.sender`, not from the `staker`; this function is explicitly designed
     * purely to help one address deposit 'for' another.
     * @param strategy is the specified strategy where deposit is to be made,
     * @param token is the denomination in which the deposit is to be made,
     * @param amount is the amount of token to be deposited in the strategy by the staker
     * @param staker the staker that the deposited assets will be credited to
     * @param expiry the timestamp at which the signature expires
     * @param signature is a valid signature from the `staker`. either an ECDSA signature if the `staker` is an EOA, or data to forward
     * following EIP-1271 if the `staker` is a contract
     * @return shares The amount of new shares in the `strategy` created as part of the action.
     * @dev The `msg.sender` must have previously approved this contract to transfer at least `amount` of `token` on their behalf.
     * @dev A signature is required for this function to eliminate the possibility of griefing attacks, specifically those
     * targeting stakers who may be attempting to undelegate.
     * @dev Cannot be called if thirdPartyTransfersForbidden is set to true for this strategy
     *
     *  WARNING: Depositing tokens that allow reentrancy (eg. ERC-777) into a strategy is not recommended.  This can lead to attack vectors
     *          where the token balance and corresponding strategy shares are not in sync upon reentrancy
     */
    function depositIntoStrategyWithSignature(
        IStrategy strategy,
        IERC20 token,
        uint256 amount,
        address staker,
        uint256 expiry,
        bytes memory signature
    ) external returns (uint256 shares);

    /// @notice Used by the DelegationManager to remove a Staker's shares from a particular strategy when entering the withdrawal queue
    function removeShares(address staker, IStrategy strategy, uint256 shares) external;

    /// @notice Used by the DelegationManager to award a Staker some shares that have passed through the withdrawal queue
    function addShares(address staker, IERC20 token, IStrategy strategy, uint256 shares) external;

    /// @notice Used by the DelegationManager to convert withdrawn shares to tokens and send them to a recipient
    function withdrawSharesAsTokens(
        address recipient,
        IStrategy strategy,
        uint256 shares,
        IERC20 token
    ) external;

    /// @notice Returns the current shares of `user` in `strategy`
    function stakerStrategyShares(
        address user,
        IStrategy strategy
    ) external view returns (uint256 shares);

    /**
     * @notice Get all details on the staker's deposits and corresponding shares
     * @return (staker's strategies, shares in these strategies)
     */
    function getDeposits(
        address staker
    ) external view returns (IStrategy[] memory, uint256[] memory);

    /// @notice Simple getter function that returns `stakerStrategyList[staker].length`.
    function stakerStrategyListLength(address staker) external view returns (uint256);

    /**
     * @notice Owner-only function that adds the provided Strategies to the 'whitelist' of strategies that stakers can deposit into
     * @param strategiesToWhitelist Strategies that will be added to the `strategyIsWhitelistedForDeposit` mapping (if they aren't in it already)
     * @param thirdPartyTransfersForbiddenValues bool values to set `thirdPartyTransfersForbidden` to for each strategy
     */
    function addStrategiesToDepositWhitelist(
        IStrategy[] calldata strategiesToWhitelist,
        bool[] calldata thirdPartyTransfersForbiddenValues
    ) external;

    /**
     * @notice Owner-only function that removes the provided Strategies from the 'whitelist' of strategies that stakers can deposit into
     * @param strategiesToRemoveFromWhitelist Strategies that will be removed to the `strategyIsWhitelistedForDeposit` mapping (if they are in it)
     */
    function removeStrategiesFromDepositWhitelist(
        IStrategy[] calldata strategiesToRemoveFromWhitelist
    ) external;

    /// @notice Returns the single, central Delegation contract of EigenLayer
    function delegation() external view returns (IDelegationManager);

    /// @notice Returns the single, central Slasher contract of EigenLayer
    function slasher() external view returns (ISlasher);

    /// @notice Returns the EigenPodManager contract of EigenLayer
    function eigenPodManager() external view returns (IEigenPodManager);

    /// @notice Returns the address of the `strategyWhitelister`
    function strategyWhitelister() external view returns (address);

    /**
     * @notice Returns bool for whether or not `strategy` enables credit transfers. i.e enabling
     * depositIntoStrategyWithSignature calls or queueing withdrawals to a different address than the staker.
     */
    function thirdPartyTransfersForbidden(IStrategy strategy) external view returns (bool);

    // LIMITED BACKWARDS-COMPATIBILITY FOR DEPRECATED FUNCTIONALITY
    // packed struct for queued withdrawals; helps deal with stack-too-deep errors
    struct DeprecatedStruct_WithdrawerAndNonce {
        address withdrawer;
        uint96 nonce;
    }

    /**
     * Struct type used to specify an existing queued withdrawal. Rather than storing the entire struct, only a hash is stored.
     * In functions that operate on existing queued withdrawals -- e.g. `startQueuedWithdrawalWaitingPeriod` or `completeQueuedWithdrawal`,
     * the data is resubmitted and the hash of the submitted data is computed by `calculateWithdrawalRoot` and checked against the
     * stored hash in order to confirm the integrity of the submitted data.
     */
    struct DeprecatedStruct_QueuedWithdrawal {
        IStrategy[] strategies;
        uint256[] shares;
        address staker;
        DeprecatedStruct_WithdrawerAndNonce withdrawerAndNonce;
        uint32 withdrawalStartBlock;
        address delegatedAddress;
    }

    function migrateQueuedWithdrawal(
        DeprecatedStruct_QueuedWithdrawal memory queuedWithdrawal
    ) external returns (bool, bytes32);

    function calculateWithdrawalRoot(
        DeprecatedStruct_QueuedWithdrawal memory queuedWithdrawal
    ) external pure returns (bytes32);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.0;

import "./Merkle.sol";
import "../libraries/Endian.sol";

//Utility library for parsing and PHASE0 beacon chain block headers
//SSZ Spec: https://github.com/ethereum/consensus-specs/blob/dev/ssz/simple-serialize.md#merkleization
//BeaconBlockHeader Spec: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#beaconblockheader
//BeaconState Spec: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#beaconstate
library BeaconChainProofs {
    /// @notice Heights of various merkle trees in the beacon chain
    /// - beaconBlockRoot
    /// |                                             HEIGHT: BEACON_BLOCK_HEADER_TREE_HEIGHT
    /// -- beaconStateRoot
    /// |                                             HEIGHT: BEACON_STATE_TREE_HEIGHT
    /// validatorContainerRoot, balanceContainerRoot
    /// |                       |                     HEIGHT: BALANCE_TREE_HEIGHT
    /// |                       individual balances
    /// |                                             HEIGHT: VALIDATOR_TREE_HEIGHT
    /// individual validators
    uint256 internal constant BEACON_BLOCK_HEADER_TREE_HEIGHT = 3;
    uint256 internal constant BEACON_STATE_TREE_HEIGHT = 5;
    uint256 internal constant BALANCE_TREE_HEIGHT = 38;
    uint256 internal constant VALIDATOR_TREE_HEIGHT = 40;

    /// @notice Index of the beaconStateRoot in the `BeaconBlockHeader` container
    ///
    /// BeaconBlockHeader = [..., state_root, ...]
    ///                      0...      3
    ///
    /// (See https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#beaconblockheader)
    uint256 internal constant STATE_ROOT_INDEX = 3;

    /// @notice Indices for fields in the `BeaconState` container
    ///
    /// BeaconState = [..., validators, balances, ...]
    ///                0...     11         12
    ///
    /// (See https://github.com/ethereum/consensus-specs/blob/dev/specs/capella/beacon-chain.md#beaconstate)
    uint256 internal constant VALIDATOR_CONTAINER_INDEX = 11;
    uint256 internal constant BALANCE_CONTAINER_INDEX = 12;

    /// @notice Number of fields in the `Validator` container
    /// (See https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator)
    uint256 internal constant VALIDATOR_FIELDS_LENGTH = 8;

    /// @notice Indices for fields in the `Validator` container
    uint256 internal constant VALIDATOR_PUBKEY_INDEX = 0;
    uint256 internal constant VALIDATOR_WITHDRAWAL_CREDENTIALS_INDEX = 1;
    uint256 internal constant VALIDATOR_BALANCE_INDEX = 2;
    uint256 internal constant VALIDATOR_SLASHED_INDEX = 3;
    uint256 internal constant VALIDATOR_EXIT_EPOCH_INDEX = 6;

    /// @notice Slot/Epoch timings
    uint64 internal constant SECONDS_PER_SLOT = 12;
    uint64 internal constant SLOTS_PER_EPOCH = 32;
    uint64 internal constant SECONDS_PER_EPOCH = SLOTS_PER_EPOCH * SECONDS_PER_SLOT;

    /// @notice `FAR_FUTURE_EPOCH` is used as the default value for certain `Validator`
    /// fields when a `Validator` is first created on the beacon chain
    uint64 internal constant FAR_FUTURE_EPOCH = type(uint64).max;
    bytes8 internal constant UINT64_MASK = 0xffffffffffffffff;

    /// @notice Contains a beacon state root and a merkle proof verifying its inclusion under a beacon block root
    struct StateRootProof {
        bytes32 beaconStateRoot;
        bytes proof;
    }

    /// @notice Contains a validator's fields and a merkle proof of their inclusion under a beacon state root
    struct ValidatorProof {
        bytes32[] validatorFields;
        bytes proof;
    }

    /// @notice Contains a beacon balance container root and a proof of this root under a beacon block root
    struct BalanceContainerProof {
        bytes32 balanceContainerRoot;
        bytes proof;
    }

    /// @notice Contains a validator balance root and a proof of its inclusion under a balance container root
    struct BalanceProof {
        bytes32 pubkeyHash;
        bytes32 balanceRoot;
        bytes proof;
    }

    /*******************************************************************************
                 VALIDATOR FIELDS -> BEACON STATE ROOT -> BEACON BLOCK ROOT
    *******************************************************************************/

    /// @notice Verify a merkle proof of the beacon state root against a beacon block root
    /// @param beaconBlockRoot merkle root of the beacon block
    /// @param proof the beacon state root and merkle proof of its inclusion under `beaconBlockRoot`
    function verifyStateRoot(bytes32 beaconBlockRoot, StateRootProof calldata proof) internal view {
        require(
            proof.proof.length == 32 * (BEACON_BLOCK_HEADER_TREE_HEIGHT),
            "BeaconChainProofs.verifyStateRoot: Proof has incorrect length"
        );

        /// This merkle proof verifies the `beaconStateRoot` under the `beaconBlockRoot`
        /// - beaconBlockRoot
        /// |                            HEIGHT: BEACON_BLOCK_HEADER_TREE_HEIGHT
        /// -- beaconStateRoot
        require(
            Merkle.verifyInclusionSha256({
                proof: proof.proof,
                root: beaconBlockRoot,
                leaf: proof.beaconStateRoot,
                index: STATE_ROOT_INDEX
            }),
            "BeaconChainProofs.verifyStateRoot: Invalid state root merkle proof"
        );
    }

    /// @notice Verify a merkle proof of a validator container against a `beaconStateRoot`
    /// @dev This proof starts at a validator's container root, proves through the validator container root,
    /// and continues proving to the root of the `BeaconState`
    /// @dev See https://eth2book.info/capella/part3/containers/dependencies/#validator for info on `Validator` containers
    /// @dev See https://eth2book.info/capella/part3/containers/state/#beaconstate for info on `BeaconState` containers
    /// @param beaconStateRoot merkle root of the `BeaconState` container
    /// @param validatorFields an individual validator's fields. These are merklized to form a `validatorRoot`,
    /// which is used as the leaf to prove against `beaconStateRoot`
    /// @param validatorFieldsProof a merkle proof of inclusion of `validatorFields` under `beaconStateRoot`
    /// @param validatorIndex the validator's unique index
    function verifyValidatorFields(
        bytes32 beaconStateRoot,
        bytes32[] calldata validatorFields,
        bytes calldata validatorFieldsProof,
        uint40 validatorIndex
    ) internal view {
        require(
            validatorFields.length == VALIDATOR_FIELDS_LENGTH,
            "BeaconChainProofs.verifyValidatorFields: Validator fields has incorrect length"
        );

        /// Note: the reason we use `VALIDATOR_TREE_HEIGHT + 1` here is because the merklization process for
        /// this container includes hashing the root of the validator tree with the length of the validator list
        require(
            validatorFieldsProof.length ==
                32 * ((VALIDATOR_TREE_HEIGHT + 1) + BEACON_STATE_TREE_HEIGHT),
            "BeaconChainProofs.verifyValidatorFields: Proof has incorrect length"
        );

        // Merkleize `validatorFields` to get the leaf to prove
        bytes32 validatorRoot = Merkle.merkleizeSha256(validatorFields);

        /// This proof combines two proofs, so its index accounts for the relative position of leaves in two trees:
        /// - beaconStateRoot
        /// |                            HEIGHT: BEACON_STATE_TREE_HEIGHT
        /// -- validatorContainerRoot
        /// |                            HEIGHT: VALIDATOR_TREE_HEIGHT + 1
        /// ---- validatorRoot
        uint256 index = (VALIDATOR_CONTAINER_INDEX << (VALIDATOR_TREE_HEIGHT + 1)) |
            uint256(validatorIndex);

        require(
            Merkle.verifyInclusionSha256({
                proof: validatorFieldsProof,
                root: beaconStateRoot,
                leaf: validatorRoot,
                index: index
            }),
            "BeaconChainProofs.verifyValidatorFields: Invalid merkle proof"
        );
    }

    /*******************************************************************************
             VALIDATOR BALANCE -> BALANCE CONTAINER ROOT -> BEACON BLOCK ROOT
    *******************************************************************************/

    /// @notice Verify a merkle proof of the beacon state's balances container against the beacon block root
    /// @dev This proof starts at the balance container root, proves through the beacon state root, and
    /// continues proving through the beacon block root. As a result, this proof will contain elements
    /// of a `StateRootProof` under the same block root, with the addition of proving the balances field
    /// within the beacon state.
    /// @dev This is used to make checkpoint proofs more efficient, as a checkpoint will verify multiple balances
    /// against the same balance container root.
    /// @param beaconBlockRoot merkle root of the beacon block
    /// @param proof a beacon balance container root and merkle proof of its inclusion under `beaconBlockRoot`
    function verifyBalanceContainer(
        bytes32 beaconBlockRoot,
        BalanceContainerProof calldata proof
    ) internal view {
        require(
            proof.proof.length == 32 * (BEACON_BLOCK_HEADER_TREE_HEIGHT + BEACON_STATE_TREE_HEIGHT),
            "BeaconChainProofs.verifyBalanceContainer: Proof has incorrect length"
        );

        /// This proof combines two proofs, so its index accounts for the relative position of leaves in two trees:
        /// - beaconBlockRoot
        /// |                            HEIGHT: BEACON_BLOCK_HEADER_TREE_HEIGHT
        /// -- beaconStateRoot
        /// |                            HEIGHT: BEACON_STATE_TREE_HEIGHT
        /// ---- balancesContainerRoot
        uint256 index = (STATE_ROOT_INDEX << (BEACON_STATE_TREE_HEIGHT)) | BALANCE_CONTAINER_INDEX;

        require(
            Merkle.verifyInclusionSha256({
                proof: proof.proof,
                root: beaconBlockRoot,
                leaf: proof.balanceContainerRoot,
                index: index
            }),
            "BeaconChainProofs.verifyBalanceContainer: invalid balance container proof"
        );
    }

    /// @notice Verify a merkle proof of a validator's balance against the beacon state's `balanceContainerRoot`
    /// @param balanceContainerRoot the merkle root of all validators' current balances
    /// @param validatorIndex the index of the validator whose balance we are proving
    /// @param proof the validator's associated balance root and a merkle proof of inclusion under `balanceContainerRoot`
    /// @return validatorBalanceGwei the validator's current balance (in gwei)
    function verifyValidatorBalance(
        bytes32 balanceContainerRoot,
        uint40 validatorIndex,
        BalanceProof calldata proof
    ) internal view returns (uint64 validatorBalanceGwei) {
        /// Note: the reason we use `BALANCE_TREE_HEIGHT + 1` here is because the merklization process for
        /// this container includes hashing the root of the balances tree with the length of the balances list
        require(
            proof.proof.length == 32 * (BALANCE_TREE_HEIGHT + 1),
            "BeaconChainProofs.verifyValidatorBalance: Proof has incorrect length"
        );

        /// When merkleized, beacon chain balances are combined into groups of 4 called a `balanceRoot`. The merkle
        /// proof here verifies that this validator's `balanceRoot` is included in the `balanceContainerRoot`
        /// - balanceContainerRoot
        /// |                            HEIGHT: BALANCE_TREE_HEIGHT
        /// -- balanceRoot
        uint256 balanceIndex = uint256(validatorIndex / 4);

        require(
            Merkle.verifyInclusionSha256({
                proof: proof.proof,
                root: balanceContainerRoot,
                leaf: proof.balanceRoot,
                index: balanceIndex
            }),
            "BeaconChainProofs.verifyValidatorBalance: Invalid merkle proof"
        );

        /// Extract the individual validator's balance from the `balanceRoot`
        return getBalanceAtIndex(proof.balanceRoot, validatorIndex);
    }

    /**
     * @notice Parses a balanceRoot to get the uint64 balance of a validator.
     * @dev During merkleization of the beacon state balance tree, four uint64 values are treated as a single
     * leaf in the merkle tree. We use validatorIndex % 4 to determine which of the four uint64 values to
     * extract from the balanceRoot.
     * @param balanceRoot is the combination of 4 validator balances being proven for
     * @param validatorIndex is the index of the validator being proven for
     * @return The validator's balance, in Gwei
     */
    function getBalanceAtIndex(
        bytes32 balanceRoot,
        uint40 validatorIndex
    ) internal pure returns (uint64) {
        uint256 bitShiftAmount = (validatorIndex % 4) * 64;
        return Endian.fromLittleEndianUint64(bytes32((uint256(balanceRoot) << bitShiftAmount)));
    }

    /// @notice Indices for fields in the `Validator` container:
    /// 0: pubkey
    /// 1: withdrawal credentials
    /// 2: effective balance
    /// 3: slashed?
    /// 4: activation elligibility epoch
    /// 5: activation epoch
    /// 6: exit epoch
    /// 7: withdrawable epoch
    ///
    /// (See https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator)

    /// @dev Retrieves a validator's pubkey hash
    function getPubkeyHash(bytes32[] memory validatorFields) internal pure returns (bytes32) {
        return validatorFields[VALIDATOR_PUBKEY_INDEX];
    }

    /// @dev Retrieves a validator's withdrawal credentials
    function getWithdrawalCredentials(
        bytes32[] memory validatorFields
    ) internal pure returns (bytes32) {
        return validatorFields[VALIDATOR_WITHDRAWAL_CREDENTIALS_INDEX];
    }

    /// @dev Retrieves a validator's effective balance (in gwei)
    function getEffectiveBalanceGwei(
        bytes32[] memory validatorFields
    ) internal pure returns (uint64) {
        return Endian.fromLittleEndianUint64(validatorFields[VALIDATOR_BALANCE_INDEX]);
    }

    /// @dev Retrieves true IFF a validator is marked slashed
    function isValidatorSlashed(bytes32[] memory validatorFields) internal pure returns (bool) {
        return validatorFields[VALIDATOR_SLASHED_INDEX] != 0;
    }

    /// @dev Retrieves a validator's exit epoch
    function getExitEpoch(bytes32[] memory validatorFields) internal pure returns (uint64) {
        return Endian.fromLittleEndianUint64(validatorFields[VALIDATOR_EXIT_EPOCH_INDEX]);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

library Endian {
    /**
     * @notice Converts a little endian-formatted uint64 to a big endian-formatted uint64
     * @param lenum little endian-formatted uint64 input, provided as 'bytes32' type
     * @return n The big endian-formatted uint64
     * @dev Note that the input is formatted as a 'bytes32' type (i.e. 256 bits), but it is immediately truncated to a uint64 (i.e. 64 bits)
     * through a right-shift/shr operation.
     */
    function fromLittleEndianUint64(bytes32 lenum) internal pure returns (uint64 n) {
        // the number needs to be stored in little-endian encoding (ie in bytes 0-8)
        n = uint64(uint256(lenum >> 192));
        return
            (n >> 56) |
            ((0x00FF000000000000 & n) >> 40) |
            ((0x0000FF0000000000 & n) >> 24) |
            ((0x000000FF00000000 & n) >> 8) |
            ((0x00000000FF000000 & n) << 8) |
            ((0x0000000000FF0000 & n) << 24) |
            ((0x000000000000FF00 & n) << 40) |
            ((0x00000000000000FF & n) << 56);
    }
}

// SPDX-License-Identifier: MIT
// Adapted from OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library Merkle {
    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. The tree is built assuming `leaf` is
     * the 0 indexed `index`'th leaf from the bottom left of the tree.
     *
     * Note this is for a Merkle tree using the keccak/sha3 hash function
     */
    function verifyInclusionKeccak(
        bytes memory proof,
        bytes32 root,
        bytes32 leaf,
        uint256 index
    ) internal pure returns (bool) {
        return processInclusionProofKeccak(proof, leaf, index) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. The tree is built assuming `leaf` is
     * the 0 indexed `index`'th leaf from the bottom left of the tree.
     *
     * _Available since v4.4._
     *
     * Note this is for a Merkle tree using the keccak/sha3 hash function
     */
    function processInclusionProofKeccak(
        bytes memory proof,
        bytes32 leaf,
        uint256 index
    ) internal pure returns (bytes32) {
        require(
            proof.length != 0 && proof.length % 32 == 0,
            "Merkle.processInclusionProofKeccak: proof length should be a non-zero multiple of 32"
        );
        bytes32 computedHash = leaf;
        for (uint256 i = 32; i <= proof.length; i += 32) {
            if (index % 2 == 0) {
                // if ith bit of index is 0, then computedHash is a left sibling
                assembly {
                    mstore(0x00, computedHash)
                    mstore(0x20, mload(add(proof, i)))
                    computedHash := keccak256(0x00, 0x40)
                    index := div(index, 2)
                }
            } else {
                // if ith bit of index is 1, then computedHash is a right sibling
                assembly {
                    mstore(0x00, mload(add(proof, i)))
                    mstore(0x20, computedHash)
                    computedHash := keccak256(0x00, 0x40)
                    index := div(index, 2)
                }
            }
        }
        return computedHash;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. The tree is built assuming `leaf` is
     * the 0 indexed `index`'th leaf from the bottom left of the tree.
     *
     * Note this is for a Merkle tree using the sha256 hash function
     */
    function verifyInclusionSha256(
        bytes memory proof,
        bytes32 root,
        bytes32 leaf,
        uint256 index
    ) internal view returns (bool) {
        return processInclusionProofSha256(proof, leaf, index) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. The tree is built assuming `leaf` is
     * the 0 indexed `index`'th leaf from the bottom left of the tree.
     *
     * _Available since v4.4._
     *
     * Note this is for a Merkle tree using the sha256 hash function
     */
    function processInclusionProofSha256(
        bytes memory proof,
        bytes32 leaf,
        uint256 index
    ) internal view returns (bytes32) {
        require(
            proof.length != 0 && proof.length % 32 == 0,
            "Merkle.processInclusionProofSha256: proof length should be a non-zero multiple of 32"
        );
        bytes32[1] memory computedHash = [leaf];
        for (uint256 i = 32; i <= proof.length; i += 32) {
            if (index % 2 == 0) {
                // if ith bit of index is 0, then computedHash is a left sibling
                assembly {
                    mstore(0x00, mload(computedHash))
                    mstore(0x20, mload(add(proof, i)))
                    if iszero(staticcall(sub(gas(), 2000), 2, 0x00, 0x40, computedHash, 0x20)) {
                        revert(0, 0)
                    }
                    index := div(index, 2)
                }
            } else {
                // if ith bit of index is 1, then computedHash is a right sibling
                assembly {
                    mstore(0x00, mload(add(proof, i)))
                    mstore(0x20, mload(computedHash))
                    if iszero(staticcall(sub(gas(), 2000), 2, 0x00, 0x40, computedHash, 0x20)) {
                        revert(0, 0)
                    }
                    index := div(index, 2)
                }
            }
        }
        return computedHash[0];
    }

    /**
     @notice this function returns the merkle root of a tree created from a set of leaves using sha256 as its hash function
     @param leaves the leaves of the merkle tree
     @return The computed Merkle root of the tree.
     @dev A pre-condition to this function is that leaves.length is a power of two.  If not, the function will merkleize the inputs incorrectly.
     */
    function merkleizeSha256(bytes32[] memory leaves) internal pure returns (bytes32) {
        //there are half as many nodes in the layer above the leaves
        uint256 numNodesInLayer = leaves.length / 2;
        //create a layer to store the internal nodes
        bytes32[] memory layer = new bytes32[](numNodesInLayer);
        //fill the layer with the pairwise hashes of the leaves
        for (uint256 i = 0; i < numNodesInLayer; i++) {
            layer[i] = sha256(abi.encodePacked(leaves[2 * i], leaves[2 * i + 1]));
        }
        //the next layer above has half as many nodes
        numNodesInLayer /= 2;
        //while we haven't computed the root
        while (numNodesInLayer != 0) {
            //overwrite the first numNodesInLayer nodes in layer with the pairwise hashes of their children
            for (uint256 i = 0; i < numNodesInLayer; i++) {
                layer[i] = sha256(abi.encodePacked(layer[2 * i], layer[2 * i + 1]));
            }
            //the next layer above has half as many nodes
            numNodesInLayer /= 2;
        }
        //the first node in the layer is the root
        return layer[0];
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

/// @dev Error for 0x0 address inputs
error InvalidZeroInput();

/// @dev Error when owner tries to sweep 0 balance token
error InvalidZeroBalance();

/// @dev Error when strategy does not have specified underlying
error InvalidStrategy();

/// @dev Error when vault with same salt already created
error VaultAlreadyCreated();

/// @dev Error when vault is already delegated
error AlreadyDelegated();

/// @dev Error when strategy underlying token does not match vault underlying token
error InvalidUnderlyingToken();

/// @dev Error when invalid token amount is deposited
error InvalidTokenAmount();

/// @dev Error when withdrawer is not the claimer
error UnAuthorizedClaimer();

/// @dev Error when vault is not delegated to any Operator
error VaultNotDelegated();

/// @dev error when try to configure maxCooldownBlocksBasisPoints > 100%
error InvalidMaxCooldownBlocksBasisPoints();

/// @dev Error when vault owner tries to configure cooldown less than EigenLayer cooldown
error InvalidWithdrawalCooldown();

/// @dev Error when admin tried to update cooldown more than 50% of minCooldownBlocks
error ExceedMaxCooldownBlocks();

/// @dev Error when admin tries to update cooldown blocks before cooldownBlocksUpdateDelay
error EarlyCooldownBlocksUpdate();

/// @dev Error when user tries to claim withdrawRequest before cooldownBlocks
error EarlyClaim();

/// @dev Error when vault owner tries to track user initiated withdrawal through emergency tracking
error UserWithdrawalAlreadyTracked();

/// @dev Error when emergency tracking already tracked withdrawal
error WithdrawalAlreadyTracked();

/// @dev Error when emergency tracking already completed withdrawal
error WithdrawalAlreadyCompleted();

/// @dev Error when vault owner tries to complete invalid Withdrawal
error InvalidWithdrawal();

/// @dev Error when vault owner tries to configure more than 100% as fee
error InvalidFee();

/// @dev Error when vault owner tried to claim rewards without specifying rewards destination
error RewardsDestinationNotConfigured();

/// @dev Error when vault is paused
error VaultPaused();

/// @dev Error when non pauser tries to change pause state
error NotPauser();

/// @dev Error when vaultOwner tries to sweep LP token
error InvalidTokenSweep();

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

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

abstract contract EzRVaultStorageV1 {
    struct UserWithdrawRequest {
        address withdrawer;
        uint256 lpTokenAmountLocked;
        uint256 createdAt;
    }

    /// @dev scale factor for underlying token as decimals
    uint8 public underlyingDecimals;

    /// @dev Underlying token for vault
    IERC20 public underlying;

    /// @dev EigenLayer Strategy for underlying token
    IStrategy public underlyingStrategy;

    /// @dev min vault cooldown blocks for user withdrawals
    uint256 public vaultCooldownBlocks;

    /// @dev tracks the block number at which cooldownBlocks got updated
    uint256 public cooldownBlocksUpdatedAt;

    /// @dev Track of token shares in withdraw queue of EigenLayer
    uint256 public queuedShares;

    /// @dev mapping to track withdraw request owner with withdrawalRoot key
    mapping(bytes32 => UserWithdrawRequest) public withdrawRequest;

    /// @dev mapping to track emergencyQueued withdrawals
    mapping(bytes32 => bool) public emergencyWithdrawal;

    /// @dev rewards fee on vault
    uint256 public vaultFee;

    /// @dev rewards fee destination specified by vaultOwner
    address public vaultFeeDestination;

    /// @dev destination for non underlying reward tokens
    address public vaultRewardsDestination;

    /// @dev track the pause status of vault
    bool public paused;

    /// @dev track the pauser account address
    address public pauser;
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _strategyManager (address): 0x858646372CC42E1A627fcE94aa7A7033e7CF075A
Arg [1] : _delegationManager (address): 0x39053D51B77DC0d36036Fc1fCc8Cb819df8Ef37A
Arg [2] : _rewardsCoordinator (address): 0x7750d328b314EfFa365A0402CcfD489B80B0adda
Arg [3] : _eigen (address): 0xec53bF9167f50cDEB3Ae105f56099aaaB9061F83
Arg [4] : _bEigen (address): 0x83E9115d334D248Ce39a6f36144aEaB5b3456e75
Arg [5] : _protocolFee (uint256): 100
Arg [6] : _protocolTreasury (address): 0xD22FB2d2c09C108c44b622c37F6d2f4Bc9f85668
Arg [7] : _maxCooldownBlocksBasisPoints (uint256): 5000

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000858646372cc42e1a627fce94aa7a7033e7cf075a
Arg [1] : 00000000000000000000000039053d51b77dc0d36036fc1fcc8cb819df8ef37a
Arg [2] : 0000000000000000000000007750d328b314effa365a0402ccfd489b80b0adda
Arg [3] : 000000000000000000000000ec53bf9167f50cdeb3ae105f56099aaab9061f83
Arg [4] : 00000000000000000000000083e9115d334d248ce39a6f36144aeab5b3456e75
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [6] : 000000000000000000000000d22fb2d2c09c108c44b622c37f6d2f4bc9f85668
Arg [7] : 0000000000000000000000000000000000000000000000000000000000001388