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

// NOTE: Mainnet uses the OpenZeppelin v4.9.0 contracts, but this imports the 4.7.1 version. This will be changed after an upgrade.
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IStrategyManager.sol";
import "../strategies/StrategyBase.sol";
import "../interfaces/IEigen.sol";

/**
 * @title Eigen Strategy implementation of `IStrategy` interface, designed to be inherited from by more complex strategies.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @dev Note that this EigenStrategy contract is designed to be compatible with both bEIGEN and EIGEN tokens. It functions exactly the same
 * as the `StrategyBase` contract if bEIGEN were the underlying token, but also allows for depositing and withdrawing EIGEN tokens. This is
 * achieved by unwrapping EIGEN into bEIGEN upon deposit, and wrapping bEIGEN into EIGEN upon withdrawal. Deposits and withdrawals with bEIGEN
 * does not perform and wrapping or unwrapping.
 * @notice This contract functions similarly to an ERC4626 vault, only without issuing a token.
 * To mitigate against the common "inflation attack" vector, we have chosen to use the 'virtual shares' mitigation route,
 * similar to [OpenZeppelin](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC4626.sol).
 * We acknowledge that this mitigation has the known downside of the virtual shares causing some losses to users, which are pronounced
 * particularly in the case of the share exchange rate changing signficantly, either positively or negatively.
 * For a fairly thorough discussion of this issue and our chosen mitigation strategy, we recommend reading through
 * [this thread](https://github.com/OpenZeppelin/openzeppelin-contracts/issues/3706) on the OpenZeppelin repo.
 * We specifically use a share offset of `SHARES_OFFSET` and a balance offset of `BALANCE_OFFSET`.
 */
contract EigenStrategy is StrategyBase {
    using SafeERC20 for IERC20;

    /**
     * @notice EIGEN can be deposited into this strategy, where it is unwrapped into bEIGEN and staked in
     * this strategy contract. EIGEN can also be withdrawn by withdrawing bEIGEN from this strategy, and
     * then wrapping it back into EIGEN.
     */
    IEigen public EIGEN;

    /// @notice Since this contract is designed to be initializable, the constructor simply sets `strategyManager`, the only immutable variable.
    constructor(IStrategyManager _strategyManager) StrategyBase(_strategyManager) {}

    function initialize(
        IEigen _EIGEN,
        IERC20 _bEIGEN,
        IPauserRegistry _pauserRegistry
    ) public virtual initializer {
        EIGEN = _EIGEN;
        _initializeStrategyBase(_bEIGEN, _pauserRegistry);
    }

    /**
     * @notice This function hook is called in EigenStrategy.deposit() and is overridden here to
     * allow for depositing of either EIGEN or bEIGEN tokens. If token is bEIGEN aka the underlyingToken,
     * then the contract functions exactly the same as the StrategyBase contract and the deposit is calculated into shares.
     * If token is EIGEN, then the EIGEN is first 1-1 unwrapped into bEIGEN and the deposit shares are calculated as normal.
     * @param token token to be deposited, can be either EIGEN or bEIGEN. If EIGEN, then is unwrapped into bEIGEN
     * @param amount deposit amount
     */
    function _beforeDeposit(IERC20 token, uint256 amount) internal virtual override {
        require(token == underlyingToken || token == EIGEN, "EigenStrategy.deposit: Can only deposit bEIGEN or EIGEN");

        if (token == EIGEN) {
            // unwrap EIGEN into bEIGEN assuming a 1-1 unwrapping amount
            // the strategy will then hold `amount` of bEIGEN
            EIGEN.unwrap(amount);
        }
    }

    /**
     * @notice This function hook is called in EigenStrategy.withdraw() before withdrawn shares are calculated and is 
     * overridden here to allow for withdrawing shares either into EIGEN or bEIGEN tokens. If wrapping bEIGEN into EIGEN is needed,
     * it is performed in _afterWithdrawal(). This hook just checks the token paramater is either EIGEN or bEIGEN.
     * @param token token to be withdrawn, can be either EIGEN or bEIGEN. If EIGEN, then bEIGEN is wrapped into EIGEN
     */
    function _beforeWithdrawal(address /*recipient*/, IERC20 token, uint256 /*amountShares*/) internal virtual override {
        require(token == underlyingToken || token == EIGEN, "EigenStrategy.withdraw: Can only withdraw bEIGEN or EIGEN");
    }

    /**
     * @notice This function hook is called in EigenStrategy.withdraw() after withdrawn shares are calculated and is
     * overridden here to allow for withdrawing shares either into EIGEN or bEIGEN tokens. If token is bEIGEN aka the underlyingToken,
     * then the contract functions exactly the same as the StrategyBase contract and transfers out bEIGEN to the recipient.
     * If token is EIGEN, then bEIGEN is first 1-1 wrapped into EIGEN and the strategy transfers out the EIGEN to the recipient.
     * @param recipient recipient of the withdrawal
     * @param token token to be withdrawn, can be either EIGEN or bEIGEN. If EIGEN, then bEIGEN is wrapped into EIGEN
     * @param amountToSend amount of tokens to transfer
     */
    function _afterWithdrawal(address recipient, IERC20 token, uint256 amountToSend) internal virtual override {
        if (token == EIGEN) {
            // wrap bEIGEN into EIGEN assuming a 1-1 wrapping amount
            // the strategy will then hold `amountToSend` of EIGEN
            underlyingToken.approve(address(token), amountToSend);
            EIGEN.wrap(amountToSend);
        }

        // Whether the withdrawal specified EIGEN or bEIGEN, the strategy
        // holds the correct balance and can transfer to the recipient here
        token.safeTransfer(recipient, amountToSend);
    }

    /**
     * @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 v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

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

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

// 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 {
    /**
     * @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 ^0.8.12;

import "../interfaces/IStrategyManager.sol";
import "../permissions/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin-upgrades/contracts/proxy/utils/Initializable.sol";

/**
 * @title Base implementation of `IStrategy` interface, designed to be inherited from by more complex strategies.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 * @notice Simple, basic, "do-nothing" Strategy that holds a single underlying token and returns it on withdrawals.
 * Implements minimal versions of the IStrategy functions, this contract is designed to be inherited by
 * more complex strategies, which can then override its functions as necessary.
 * @dev Note that some functions have their mutability restricted; developers inheriting from this contract cannot broaden
 * the mutability without modifying this contract itself.
 * @dev This contract is expressly *not* intended for use with 'fee-on-transfer'-type tokens.
 * Setting the `underlyingToken` to be a fee-on-transfer token may result in improper accounting.
 * @notice This contract functions similarly to an ERC4626 vault, only without issuing a token.
 * To mitigate against the common "inflation attack" vector, we have chosen to use the 'virtual shares' mitigation route,
 * similar to [OpenZeppelin](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC4626.sol).
 * We acknowledge that this mitigation has the known downside of the virtual shares causing some losses to users, which are pronounced
 * particularly in the case of the share exchange rate changing signficantly, either positively or negatively.
 * For a fairly thorough discussion of this issue and our chosen mitigation strategy, we recommend reading through
 * [this thread](https://github.com/OpenZeppelin/openzeppelin-contracts/issues/3706) on the OpenZeppelin repo.
 * We specifically use a share offset of `SHARES_OFFSET` and a balance offset of `BALANCE_OFFSET`.
 */
contract StrategyBase is Initializable, Pausable, IStrategy {
    using SafeERC20 for IERC20;

    uint8 internal constant PAUSED_DEPOSITS = 0;
    uint8 internal constant PAUSED_WITHDRAWALS = 1;

    /**
     * @notice virtual shares used as part of the mitigation of the common 'share inflation' attack vector.
     * Constant value chosen to reasonably reduce attempted share inflation by the first depositor, while still
     * incurring reasonably small losses to depositors
     */
    uint256 internal constant SHARES_OFFSET = 1e3;
    /**
     * @notice virtual balance used as part of the mitigation of the common 'share inflation' attack vector
     * Constant value chosen to reasonably reduce attempted share inflation by the first depositor, while still
     * incurring reasonably small losses to depositors
     */
    uint256 internal constant BALANCE_OFFSET = 1e3;

    /// @notice EigenLayer's StrategyManager contract
    IStrategyManager public immutable strategyManager;

    /// @notice The underlying token for shares in this Strategy
    IERC20 public underlyingToken;

    /// @notice The total number of extant shares in this Strategy
    uint256 public totalShares;

    /// @notice Simply checks that the `msg.sender` is the `strategyManager`, which is an address stored immutably at construction.
    modifier onlyStrategyManager() {
        require(msg.sender == address(strategyManager), "StrategyBase.onlyStrategyManager");
        _;
    }

    /// @notice Since this contract is designed to be initializable, the constructor simply sets `strategyManager`, the only immutable variable.
    constructor(IStrategyManager _strategyManager) {
        strategyManager = _strategyManager;
        _disableInitializers();
    }

    function initialize(IERC20 _underlyingToken, IPauserRegistry _pauserRegistry) public virtual initializer {
        _initializeStrategyBase(_underlyingToken, _pauserRegistry);
    }

    /// @notice Sets the `underlyingToken` and `pauserRegistry` for the strategy.
    function _initializeStrategyBase(
        IERC20 _underlyingToken,
        IPauserRegistry _pauserRegistry
    ) internal onlyInitializing {
        underlyingToken = _underlyingToken;
        _initializePauser(_pauserRegistry, UNPAUSE_ALL);
    }

    /**
     * @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.
     * @dev Note that the assumption is made that `amount` of `token` has already been transferred directly to this contract
     * (as performed in the StrategyManager's deposit functions). In particular, setting the `underlyingToken` of this contract
     * to be a fee-on-transfer token will break the assumption that the amount this contract *received* of the token is equal to
     * the amount that was input when the transfer was performed (i.e. the amount transferred 'out' of the depositor's balance).
     * @dev Note that any validation of `token` is done inside `_beforeDeposit`. This can be overridden if needed.
     * @return newShares is the number of new shares issued at the current exchange ratio.
     */
    function deposit(
        IERC20 token,
        uint256 amount
    ) external virtual override onlyWhenNotPaused(PAUSED_DEPOSITS) onlyStrategyManager returns (uint256 newShares) {
        // call hook to allow for any pre-deposit logic
        _beforeDeposit(token, amount);

        // copy `totalShares` value to memory, prior to any change
        uint256 priorTotalShares = totalShares;

        /**
         * @notice calculation of newShares *mirrors* `underlyingToShares(amount)`, but is different since the balance of `underlyingToken`
         * has already been increased due to the `strategyManager` transferring tokens to this strategy prior to calling this function
         */
        // account for virtual shares and balance
        uint256 virtualShareAmount = priorTotalShares + SHARES_OFFSET;
        uint256 virtualTokenBalance = _tokenBalance() + BALANCE_OFFSET;
        // calculate the prior virtual balance to account for the tokens that were already transferred to this contract
        uint256 virtualPriorTokenBalance = virtualTokenBalance - amount;
        newShares = (amount * virtualShareAmount) / virtualPriorTokenBalance;

        // extra check for correctness / against edge case where share rate can be massively inflated as a 'griefing' sort of attack
        require(newShares != 0, "StrategyBase.deposit: newShares cannot be zero");

        // update total share amount to account for deposit
        totalShares = (priorTotalShares + newShares);
        return newShares;
    }

    /**
     * @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.
     * @dev Note that any validation of `token` is done inside `_beforeWithdrawal`. This can be overridden if needed.
     */
    function withdraw(
        address recipient,
        IERC20 token,
        uint256 amountShares
    ) external virtual override onlyWhenNotPaused(PAUSED_WITHDRAWALS) onlyStrategyManager {
        // call hook to allow for any pre-withdrawal logic
        _beforeWithdrawal(recipient, token, amountShares);

        // copy `totalShares` value to memory, prior to any change
        uint256 priorTotalShares = totalShares;

        require(
            amountShares <= priorTotalShares,
            "StrategyBase.withdraw: amountShares must be less than or equal to totalShares"
        );

        /**
         * @notice calculation of amountToSend *mirrors* `sharesToUnderlying(amountShares)`, but is different since the `totalShares` has already
         * been decremented. Specifically, notice how we use `priorTotalShares` here instead of `totalShares`.
         */
        // account for virtual shares and balance
        uint256 virtualPriorTotalShares = priorTotalShares + SHARES_OFFSET;
        uint256 virtualTokenBalance = _tokenBalance() + BALANCE_OFFSET;
        // calculate ratio based on virtual shares and balance, being careful to multiply before dividing
        uint256 amountToSend = (virtualTokenBalance * amountShares) / virtualPriorTotalShares;

        // Decrease the `totalShares` value to reflect the withdrawal
        totalShares = priorTotalShares - amountShares;

        _afterWithdrawal(recipient, token, amountToSend);
    }

    /**
     * @notice Called in the external `deposit` function, before any logic is executed. Expected to be overridden if strategies want such logic.
     * @param token The token being deposited
     * @param amount The amount of `token` being deposited
     */
    function _beforeDeposit(IERC20 token, uint256 amount) internal virtual {
        require(token == underlyingToken, "StrategyBase.deposit: Can only deposit underlyingToken");
    }

    /**
     * @notice Called in the external `withdraw` function, before any logic is executed.  Expected to be overridden if strategies want such logic.
     * @param recipient The address that will receive the withdrawn tokens
     * @param token The token being withdrawn
     * @param amountShares The amount of shares being withdrawn
     */
    function _beforeWithdrawal(address recipient, IERC20 token, uint256 amountShares) internal virtual {
        require(token == underlyingToken, "StrategyBase.withdraw: Can only withdraw the strategy token");
    }

    /**
     * @notice Transfers tokens to the recipient after a withdrawal is processed
     * @dev Called in the external `withdraw` function after all logic is executed
     * @param recipient The destination of the tokens
     * @param token The ERC20 being transferred
     * @param amountToSend The amount of `token` to transfer
     */
    function _afterWithdrawal(address recipient, IERC20 token, uint256 amountToSend) internal virtual {
        token.safeTransfer(recipient, amountToSend);
    }

    /**
     * @notice Currently returns a brief string explaining the strategy's goal & purpose, but for more complex
     * strategies, may be a link to metadata that explains in more detail.
     */
    function explanation() external pure virtual override returns (string memory) {
        return "Base Strategy implementation to inherit from for more complex implementations";
    }

    /**
     * @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 underlying tokens corresponding to the input `amountShares`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function sharesToUnderlyingView(uint256 amountShares) public view virtual override returns (uint256) {
        // account for virtual shares and balance
        uint256 virtualTotalShares = totalShares + SHARES_OFFSET;
        uint256 virtualTokenBalance = _tokenBalance() + BALANCE_OFFSET;
        // calculate ratio based on virtual shares and balance, being careful to multiply before dividing
        return (virtualTokenBalance * amountShares) / virtualTotalShares;
    }

    /**
     * @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) public view virtual override returns (uint256) {
        return sharesToUnderlyingView(amountShares);
    }

    /**
     * @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) public view virtual returns (uint256) {
        // account for virtual shares and balance
        uint256 virtualTotalShares = totalShares + SHARES_OFFSET;
        uint256 virtualTokenBalance = _tokenBalance() + BALANCE_OFFSET;
        // calculate ratio based on virtual shares and balance, being careful to multiply before dividing
        return (amountUnderlying * virtualTotalShares) / virtualTokenBalance;
    }

    /**
     * @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 shares corresponding to the input `amountUnderlying`
     * @dev Implementation for these functions in particular may vary significantly for different strategies
     */
    function underlyingToShares(uint256 amountUnderlying) external view virtual returns (uint256) {
        return underlyingToSharesView(amountUnderlying);
    }

    /**
     * @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 virtual returns (uint256) {
        return sharesToUnderlyingView(shares(user));
    }

    /**
     * @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 virtual returns (uint256) {
        return sharesToUnderlying(shares(user));
    }

    /**
     * @notice convenience function for fetching the current total shares of `user` in this strategy, by
     * querying the `strategyManager` contract
     */
    function shares(address user) public view virtual returns (uint256) {
        return strategyManager.stakerStrategyShares(user, IStrategy(address(this)));
    }

    /// @notice Internal function used to fetch this contract's current balance of `underlyingToken`.
    // slither-disable-next-line dead-code
    function _tokenBalance() internal view virtual returns (uint256) {
        return underlyingToken.balanceOf(address(this));
    }

    /**
     * @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[48] private __gap;
}

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

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

interface IEigen is IERC20 {

    /**
     * @notice This function allows the owner to set the allowedFrom status of an address
     * @param from the address whose allowedFrom status is being set
     * @param isAllowedFrom the new allowedFrom status
     */
    function setAllowedFrom(address from, bool isAllowedFrom) external;

    /**
     * @notice This function allows the owner to set the allowedTo status of an address
     * @param to the address whose allowedTo status is being set
     * @param isAllowedTo the new allowedTo status
     */
    function setAllowedTo(address to, bool isAllowedTo) external;

    /**
     * @notice Allows the owner to disable transfer restrictions
     */
    function disableTransferRestrictions() external;

    /**
     * @notice This function allows minter to mint tokens
     */
    function mint() external;

    /**
     * @notice This function allows bEIGEN holders to wrap their tokens into Eigen
     */
    function wrap(uint256 amount) external;

    /**
     * @notice This function allows Eigen holders to unwrap their tokens into bEIGEN
     */
    function unwrap(uint256 amount) external;

    /**
     * @dev Clock used for flagging checkpoints. Has been overridden to implement timestamp based
     * checkpoints (and voting).
     */
    function clock() external view returns (uint48);

    /**
     * @dev Machine-readable description of the clock as specified in EIP-6372.
     * Has been overridden to inform callers that this contract uses timestamps instead of block numbers, to match `clock()`
     */
    // solhint-disable-next-line func-name-mixedcase
    function CLOCK_MODE() external pure returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// 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 "./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 "./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 {
    // @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;
}

// 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 "./IBeaconChainOracle.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 update of the beaconChainOracle address
    event BeaconOracleUpdated(address indexed newOracleAddress);

    /// @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
    );

    event DenebForkTimestampUpdated(uint64 newValue);

    /**
     * @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 Updates the oracle contract that provides the beacon chain state root
     * @param newBeaconChainOracle is the new oracle contract being pointed to
     * @dev Callable only by the owner of this contract (i.e. governance)
     */
    function updateBeaconChainOracle(IBeaconChainOracle newBeaconChainOracle) 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 Oracle contract that provides updates to the beacon chain's state
    function beaconChainOracle() external view returns (IBeaconChainOracle);

    /// @notice Returns the beacon block root at `timestamp`. Reverts if the Beacon block root at `timestamp` has not yet been finalized.
    function getBlockRootAtTimestamp(uint64 timestamp) external view returns (bytes32);

    /// @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;

    /**
     * @notice the deneb hard fork timestamp used to determine which proof path to use for proving a withdrawal
     */
    function denebForkTimestamp() external view returns (uint64);

     /**
     * setting the deneb hard fork timestamp by the eigenPodManager owner
     * @dev this function is designed to be called twice.  Once, it is set to type(uint64).max 
     * prior to the actual deneb fork timestamp being set, and then the second time it is set 
     * to the actual deneb fork timestamp.
     */
    function setDenebForkTimestamp(uint64 newDenebForkTimestamp) external;

}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.12;

import "../interfaces/IPausable.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
 */
contract Pausable is IPausable {
    /// @notice Address of the `PauserRegistry` contract that this contract defers to for determining access control (for pausing).
    IPauserRegistry public pauserRegistry;

    /// @dev whether or not the contract is currently paused
    uint256 private _paused;

    uint256 internal constant UNPAUSE_ALL = 0;
    uint256 internal constant PAUSE_ALL = type(uint256).max;

    /// @notice
    modifier onlyPauser() {
        require(pauserRegistry.isPauser(msg.sender), "msg.sender is not permissioned as pauser");
        _;
    }

    modifier onlyUnpauser() {
        require(msg.sender == pauserRegistry.unpauser(), "msg.sender is not permissioned as unpauser");
        _;
    }

    /// @notice Throws if the contract is paused, i.e. if any of the bits in `_paused` is flipped to 1.
    modifier whenNotPaused() {
        require(_paused == 0, "Pausable: contract is paused");
        _;
    }

    /// @notice Throws if the `indexed`th bit of `_paused` is 1, i.e. if the `index`th pause switch is flipped.
    modifier onlyWhenNotPaused(uint8 index) {
        require(!paused(index), "Pausable: index is paused");
        _;
    }

    /// @notice One-time function for setting the `pauserRegistry` and initializing the value of `_paused`.
    function _initializePauser(IPauserRegistry _pauserRegistry, uint256 initPausedStatus) internal {
        require(
            address(pauserRegistry) == address(0) && address(_pauserRegistry) != address(0),
            "Pausable._initializePauser: _initializePauser() can only be called once"
        );
        _paused = initPausedStatus;
        emit Paused(msg.sender, initPausedStatus);
        _setPauserRegistry(_pauserRegistry);
    }

    /**
     * @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 onlyPauser {
        // verify that the `newPausedStatus` does not *unflip* any bits (i.e. doesn't unpause anything, all 1 bits remain)
        require((_paused & newPausedStatus) == _paused, "Pausable.pause: invalid attempt to unpause functionality");
        _paused = newPausedStatus;
        emit Paused(msg.sender, newPausedStatus);
    }

    /**
     * @notice Alias for `pause(type(uint256).max)`.
     */
    function pauseAll() external onlyPauser {
        _paused = type(uint256).max;
        emit Paused(msg.sender, type(uint256).max);
    }

    /**
     * @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 onlyUnpauser {
        // verify that the `newPausedStatus` does not *flip* any bits (i.e. doesn't pause anything, all 0 bits remain)
        require(
            ((~_paused) & (~newPausedStatus)) == (~_paused),
            "Pausable.unpause: invalid attempt to pause functionality"
        );
        _paused = newPausedStatus;
        emit Unpaused(msg.sender, newPausedStatus);
    }

    /// @notice Returns the current paused status as a uint256.
    function paused() public view virtual returns (uint256) {
        return _paused;
    }

    /// @notice Returns 'true' if the `indexed`th bit of `_paused` is 1, and 'false' otherwise
    function paused(uint8 index) public view virtual returns (bool) {
        uint256 mask = 1 << index;
        return ((_paused & mask) == mask);
    }

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

    /// internal function for setting pauser registry
    function _setPauserRegistry(IPauserRegistry newPauserRegistry) internal {
        require(
            address(newPauserRegistry) != address(0),
            "Pausable._setPauserRegistry: newPauserRegistry cannot be the zero address"
        );
        emit PauserRegistrySet(pauserRegistry, newPauserRegistry);
        pauserRegistry = newPauserRegistry;
    }

    /**
     * @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[48] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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]
 * ```
 * 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. Equivalent to `reinitializer(1)`.
     */
    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.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so 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.
     *
     * 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.
     */
    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.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

// 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: 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);
}

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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 "./IBeaconChainOracle.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
 * @notice The main functionalities are:
 * - creating new ETH validators with their withdrawal credentials pointed to this contract
 * - proving from beacon chain state roots that withdrawal credentials are pointed to this contract
 * - proving from beacon chain state roots the balances of ETH validators with their withdrawal credentials
 *   pointed to this contract
 * - updating aggregate balances in the EigenPodManager
 * - withdrawing eth when withdrawals are initiated
 * @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 {
    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 mostRecentBalanceUpdateTimestamp;
        // status of the validator
        VALIDATOR_STATUS status;
    }

    /**
     * @notice struct used to store amounts related to proven withdrawals in memory. Used to help
     * manage stack depth and optimize the number of external calls, when batching withdrawal operations.
     */
    struct VerifiedWithdrawal {
        // amount to send to a podOwner from a proven withdrawal
        uint256 amountToSendGwei;
        // difference in shares to be recorded in the eigenPodManager, as a result of the withdrawal
        int256 sharesDeltaGwei;
    }


    enum PARTIAL_WITHDRAWAL_CLAIM_STATUS {
        REDEEMED,
        PENDING,
        FAILED
    }

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

    /// @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 an ETH validator is prove to have withdrawn from the beacon chain
    event FullWithdrawalRedeemed(
        uint40 validatorIndex,
        uint64 withdrawalTimestamp,
        address indexed recipient,
        uint64 withdrawalAmountGwei
    );

    /// @notice Emitted when a partial withdrawal claim is successfully redeemed
    event PartialWithdrawalRedeemed(
        uint40 validatorIndex,
        uint64 withdrawalTimestamp,
        address indexed recipient,
        uint64 partialWithdrawalAmountGwei
    );

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

    /// @notice Emitted when podOwner enables restaking
    event RestakingActivated(address indexed podOwner);

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

    /// @notice Emitted when ETH that was previously received via the `receive` fallback is withdrawn
    event NonBeaconChainETHWithdrawn(address indexed recipient, uint256 amountWithdrawn);


    /// @notice The max amount of eth, in gwei, that can be restaked per validator
    function MAX_RESTAKED_BALANCE_GWEI_PER_VALIDATOR() external view returns (uint64);

    /// @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 any ETH deposited into the EigenPod contract via the `receive` fallback function
    function nonBeaconChainETHBalanceWei() external view returns (uint256);

    /// @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;

    /// @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 an indicator of whether or not the podOwner has ever "fully restaked" by successfully calling `verifyCorrectWithdrawalCredentials`.
    function hasRestaked() external view returns (bool);

    /**
     * @notice The latest timestamp at which the pod owner withdrew the balance of the pod, via calling `withdrawBeforeRestaking`.
     * @dev This variable is only updated when the `withdrawBeforeRestaking` function is called, which can only occur before `hasRestaked` is set to true for this pod.
     * Proofs for this pod are only valid against Beacon Chain state roots corresponding to timestamps after the stored `mostRecentWithdrawalTimestamp`.
     */
    function mostRecentWithdrawalTimestamp() external view returns (uint64);

    /// @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 mapping that tracks proven withdrawals
    function provenWithdrawal(bytes32 validatorPubkeyHash, uint64 slot) external view returns (bool);

    /// @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 This function verifies that the withdrawal credentials of validator(s) owned by the podOwner are pointed to
     * this contract. It also verifies the effective balance  of the validator.  It verifies the provided proof of the ETH validator against the beacon chain state
     * root, marks the validator as 'active' in EigenLayer, and credits the restaked ETH in Eigenlayer.
     * @param oracleTimestamp is the Beacon Chain timestamp whose state root the `proof` will be proven against.
     * @param validatorIndices is the list of indices of the validators being proven, refer to consensus specs
     * @param withdrawalCredentialProofs is an array of proofs, where each proof proves each ETH validator's balance and withdrawal credentials
     * against a beacon chain state root
     * @param validatorFields are the fields of the "Validator Container", refer to consensus specs
     * for details: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator
     */
    function verifyWithdrawalCredentials(
        uint64 oracleTimestamp,
        BeaconChainProofs.StateRootProof calldata stateRootProof,
        uint40[] calldata validatorIndices,
        bytes[] calldata withdrawalCredentialProofs,
        bytes32[][] calldata validatorFields
    )
        external;

    /**
     * @notice This function records an update (either increase or decrease) in the pod's balance in the StrategyManager.  
               It also verifies a merkle proof of the validator's current beacon chain balance.  
     * @param oracleTimestamp The oracleTimestamp whose state root the `proof` will be proven against.
     *        Must be within `VERIFY_BALANCE_UPDATE_WINDOW_SECONDS` of the current block.
     * @param validatorIndices is the list of indices of the validators being proven, refer to consensus specs 
     * @param validatorFieldsProofs proofs against the `beaconStateRoot` for each validator in `validatorFields`
     * @param validatorFields are the fields of the "Validator Container", refer to consensus specs
     * @dev For more details on the Beacon Chain spec, see: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator
     */
    function verifyBalanceUpdates(
        uint64 oracleTimestamp,
        uint40[] calldata validatorIndices,
        BeaconChainProofs.StateRootProof calldata stateRootProof,
        bytes[] calldata validatorFieldsProofs,
        bytes32[][] calldata validatorFields
    ) external;

    /**
     * @notice This function records full and partial withdrawals on behalf of one of the Ethereum validators for this EigenPod
     * @param oracleTimestamp is the timestamp of the oracle slot that the withdrawal is being proven against
     * @param withdrawalProofs is the information needed to check the veracity of the block numbers and withdrawals being proven
     * @param validatorFieldsProofs is the proof of the validator's fields' in the validator tree
     * @param withdrawalFields are the fields of the withdrawals being proven
     * @param validatorFields are the fields of the validators being proven
     */
    function verifyAndProcessWithdrawals(
        uint64 oracleTimestamp,
        BeaconChainProofs.StateRootProof calldata stateRootProof,
        BeaconChainProofs.WithdrawalProof[] calldata withdrawalProofs,
        bytes[] calldata validatorFieldsProofs,
        bytes32[][] calldata validatorFields,
        bytes32[][] calldata withdrawalFields
    ) external;

    /**
     * @notice Called by the pod owner to activate restaking by withdrawing
     * all existing ETH from the pod and preventing further withdrawals via
     * "withdrawBeforeRestaking()"
     */
    function activateRestaking() external;

    /// @notice Called by the pod owner to withdraw the balance of the pod when `hasRestaked` is set to false
    function withdrawBeforeRestaking() external;

    /// @notice Called by the pod owner to withdraw the nonBeaconChainETHBalanceWei
    function withdrawNonBeaconChainETHBalanceWei(address recipient, uint256 amountToWithdraw) 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;
}

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

/**
 * @title Interface for the BeaconStateOracle contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 */
interface IBeaconChainOracle {
    /// @notice The block number to state root mapping.
    function timestampToBlockRoot(uint256 timestamp) external view returns (bytes32);
}

// 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: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// 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 {
    // constants are the number of fields and the heights of the different merkle trees used in merkleizing beacon chain containers
    uint256 internal constant BEACON_BLOCK_HEADER_FIELD_TREE_HEIGHT = 3;

    uint256 internal constant BEACON_BLOCK_BODY_FIELD_TREE_HEIGHT = 4;

    uint256 internal constant BEACON_STATE_FIELD_TREE_HEIGHT = 5;

    uint256 internal constant VALIDATOR_FIELD_TREE_HEIGHT = 3;

    //Note: changed in the deneb hard fork from 4->5
    uint256 internal constant EXECUTION_PAYLOAD_HEADER_FIELD_TREE_HEIGHT_DENEB = 5;
    uint256 internal constant EXECUTION_PAYLOAD_HEADER_FIELD_TREE_HEIGHT_CAPELLA = 4;

    // SLOTS_PER_HISTORICAL_ROOT = 2**13, so tree height is 13
    uint256 internal constant BLOCK_ROOTS_TREE_HEIGHT = 13;

    //HISTORICAL_ROOTS_LIMIT = 2**24, so tree height is 24
    uint256 internal constant HISTORICAL_SUMMARIES_TREE_HEIGHT = 24;

    //Index of block_summary_root in historical_summary container
    uint256 internal constant BLOCK_SUMMARY_ROOT_INDEX = 0;

    // tree height for hash tree of an individual withdrawal container
    uint256 internal constant WITHDRAWAL_FIELD_TREE_HEIGHT = 2;

    uint256 internal constant VALIDATOR_TREE_HEIGHT = 40;

    // MAX_WITHDRAWALS_PER_PAYLOAD = 2**4, making tree height = 4
    uint256 internal constant WITHDRAWALS_TREE_HEIGHT = 4;

    //in beacon block body https://github.com/ethereum/consensus-specs/blob/dev/specs/capella/beacon-chain.md#beaconblockbody
    uint256 internal constant EXECUTION_PAYLOAD_INDEX = 9;

    // in beacon block header https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#beaconblockheader
    uint256 internal constant SLOT_INDEX = 0;
    uint256 internal constant STATE_ROOT_INDEX = 3;
    uint256 internal constant BODY_ROOT_INDEX = 4;
    // in beacon state https://github.com/ethereum/consensus-specs/blob/dev/specs/capella/beacon-chain.md#beaconstate
    uint256 internal constant VALIDATOR_TREE_ROOT_INDEX = 11;
    uint256 internal constant HISTORICAL_SUMMARIES_INDEX = 27;

    // in validator https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#validator
    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_WITHDRAWABLE_EPOCH_INDEX = 7;

    // in execution payload header
    uint256 internal constant TIMESTAMP_INDEX = 9;

    //in execution payload
    uint256 internal constant WITHDRAWALS_INDEX = 14;

    // in withdrawal
    uint256 internal constant WITHDRAWAL_VALIDATOR_INDEX_INDEX = 1;
    uint256 internal constant WITHDRAWAL_VALIDATOR_AMOUNT_INDEX = 3;

    //Misc Constants

    /// @notice The number of slots each epoch in the beacon chain
    uint64 internal constant SLOTS_PER_EPOCH = 32;

    /// @notice The number of seconds in a slot in the beacon chain
    uint64 internal constant SECONDS_PER_SLOT = 12;

    /// @notice Number of seconds per epoch: 384 == 32 slots/epoch * 12 seconds/slot 
    uint64 internal constant SECONDS_PER_EPOCH = SLOTS_PER_EPOCH * SECONDS_PER_SLOT;

    bytes8 internal constant UINT64_MASK = 0xffffffffffffffff;

    /// @notice This struct contains the merkle proofs and leaves needed to verify a partial/full withdrawal
    struct WithdrawalProof {
        bytes withdrawalProof;
        bytes slotProof;
        bytes executionPayloadProof;
        bytes timestampProof;
        bytes historicalSummaryBlockRootProof;
        uint64 blockRootIndex;
        uint64 historicalSummaryIndex;
        uint64 withdrawalIndex;
        bytes32 blockRoot;
        bytes32 slotRoot;
        bytes32 timestampRoot;
        bytes32 executionPayloadRoot;
    }

    /// @notice This struct contains the root and proof for verifying the state root against the oracle block root
    struct StateRootProof {
        bytes32 beaconStateRoot;
        bytes proof;
    }

    /**
     * @notice This function verifies merkle proofs of the fields of a certain validator against a beacon chain state root
     * @param validatorIndex the index of the proven validator
     * @param beaconStateRoot is the beacon chain state root to be proven against.
     * @param validatorFieldsProof is the data used in proving the validator's fields
     * @param validatorFields the claimed fields of the validator
     */
    function verifyValidatorFields(
        bytes32 beaconStateRoot,
        bytes32[] calldata validatorFields,
        bytes calldata validatorFieldsProof,
        uint40 validatorIndex
    ) internal view {
        require(
            validatorFields.length == 2 ** VALIDATOR_FIELD_TREE_HEIGHT,
            "BeaconChainProofs.verifyValidatorFields: Validator fields has incorrect length"
        );

        /**
         * Note: the length of the validator merkle proof is BeaconChainProofs.VALIDATOR_TREE_HEIGHT + 1.
         * There is an additional layer added by hashing the root with the length of the validator list
         */
        require(
            validatorFieldsProof.length == 32 * ((VALIDATOR_TREE_HEIGHT + 1) + BEACON_STATE_FIELD_TREE_HEIGHT),
            "BeaconChainProofs.verifyValidatorFields: Proof has incorrect length"
        );
        uint256 index = (VALIDATOR_TREE_ROOT_INDEX << (VALIDATOR_TREE_HEIGHT + 1)) | uint256(validatorIndex);
        // merkleize the validatorFields to get the leaf to prove
        bytes32 validatorRoot = Merkle.merkleizeSha256(validatorFields);

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

    /**
     * @notice This function verifies the latestBlockHeader against the state root. the latestBlockHeader is
     * a tracked in the beacon state.
     * @param beaconStateRoot is the beacon chain state root to be proven against.
     * @param stateRootProof is the provided merkle proof
     * @param latestBlockRoot is hashtree root of the latest block header in the beacon state
     */
    function verifyStateRootAgainstLatestBlockRoot(
        bytes32 latestBlockRoot,
        bytes32 beaconStateRoot,
        bytes calldata stateRootProof
    ) internal view {
        require(
            stateRootProof.length == 32 * (BEACON_BLOCK_HEADER_FIELD_TREE_HEIGHT),
            "BeaconChainProofs.verifyStateRootAgainstLatestBlockRoot: Proof has incorrect length"
        );
        //Next we verify the slot against the blockRoot
        require(
            Merkle.verifyInclusionSha256({
                proof: stateRootProof,
                root: latestBlockRoot,
                leaf: beaconStateRoot,
                index: STATE_ROOT_INDEX
            }),
            "BeaconChainProofs.verifyStateRootAgainstLatestBlockRoot: Invalid latest block header root merkle proof"
        );
    }

    /**
     * @notice This function verifies the slot and the withdrawal fields for a given withdrawal
     * @param withdrawalProof is the provided set of merkle proofs
     * @param withdrawalFields is the serialized withdrawal container to be proven
     */
    function verifyWithdrawal(
        bytes32 beaconStateRoot,
        bytes32[] calldata withdrawalFields,
        WithdrawalProof calldata withdrawalProof,
        uint64 denebForkTimestamp
    ) internal view {
        require(
            withdrawalFields.length == 2 ** WITHDRAWAL_FIELD_TREE_HEIGHT,
            "BeaconChainProofs.verifyWithdrawal: withdrawalFields has incorrect length"
        );

        require(
            withdrawalProof.blockRootIndex < 2 ** BLOCK_ROOTS_TREE_HEIGHT,
            "BeaconChainProofs.verifyWithdrawal: blockRootIndex is too large"
        );
        require(
            withdrawalProof.withdrawalIndex < 2 ** WITHDRAWALS_TREE_HEIGHT,
            "BeaconChainProofs.verifyWithdrawal: withdrawalIndex is too large"
        );

        require(
            withdrawalProof.historicalSummaryIndex < 2 ** HISTORICAL_SUMMARIES_TREE_HEIGHT,
            "BeaconChainProofs.verifyWithdrawal: historicalSummaryIndex is too large"
        );

        //Note: post deneb hard fork, the number of exection payload header fields increased from 15->17, adding an extra level to the tree height
        uint256 executionPayloadHeaderFieldTreeHeight = (getWithdrawalTimestamp(withdrawalProof) < denebForkTimestamp) ? EXECUTION_PAYLOAD_HEADER_FIELD_TREE_HEIGHT_CAPELLA : EXECUTION_PAYLOAD_HEADER_FIELD_TREE_HEIGHT_DENEB;
        require(
            withdrawalProof.withdrawalProof.length ==
                32 * (executionPayloadHeaderFieldTreeHeight + WITHDRAWALS_TREE_HEIGHT + 1),
            "BeaconChainProofs.verifyWithdrawal: withdrawalProof has incorrect length"
        );
        require(
            withdrawalProof.executionPayloadProof.length ==
                32 * (BEACON_BLOCK_HEADER_FIELD_TREE_HEIGHT + BEACON_BLOCK_BODY_FIELD_TREE_HEIGHT),
            "BeaconChainProofs.verifyWithdrawal: executionPayloadProof has incorrect length"
        );
        require(
            withdrawalProof.slotProof.length == 32 * (BEACON_BLOCK_HEADER_FIELD_TREE_HEIGHT),
            "BeaconChainProofs.verifyWithdrawal: slotProof has incorrect length"
        );
        require(
            withdrawalProof.timestampProof.length == 32 * (executionPayloadHeaderFieldTreeHeight),
            "BeaconChainProofs.verifyWithdrawal: timestampProof has incorrect length"
        );

        require(
            withdrawalProof.historicalSummaryBlockRootProof.length ==
                32 *
                    (BEACON_STATE_FIELD_TREE_HEIGHT +
                        (HISTORICAL_SUMMARIES_TREE_HEIGHT + 1) +
                        1 +
                        (BLOCK_ROOTS_TREE_HEIGHT)),
            "BeaconChainProofs.verifyWithdrawal: historicalSummaryBlockRootProof has incorrect length"
        );
        /**
         * Note: Here, the "1" in "1 + (BLOCK_ROOTS_TREE_HEIGHT)" signifies that extra step of choosing the "block_root_summary" within the individual
         * "historical_summary". Everywhere else it signifies merkelize_with_mixin, where the length of an array is hashed with the root of the array,
         * but not here.
         */
        uint256 historicalBlockHeaderIndex = (HISTORICAL_SUMMARIES_INDEX <<
            ((HISTORICAL_SUMMARIES_TREE_HEIGHT + 1) + 1 + (BLOCK_ROOTS_TREE_HEIGHT))) |
            (uint256(withdrawalProof.historicalSummaryIndex) << (1 + (BLOCK_ROOTS_TREE_HEIGHT))) |
            (BLOCK_SUMMARY_ROOT_INDEX << (BLOCK_ROOTS_TREE_HEIGHT)) |
            uint256(withdrawalProof.blockRootIndex);

        require(
            Merkle.verifyInclusionSha256({
                proof: withdrawalProof.historicalSummaryBlockRootProof,
                root: beaconStateRoot,
                leaf: withdrawalProof.blockRoot,
                index: historicalBlockHeaderIndex
            }),
            "BeaconChainProofs.verifyWithdrawal: Invalid historicalsummary merkle proof"
        );

        //Next we verify the slot against the blockRoot
        require(
            Merkle.verifyInclusionSha256({
                proof: withdrawalProof.slotProof,
                root: withdrawalProof.blockRoot,
                leaf: withdrawalProof.slotRoot,
                index: SLOT_INDEX
            }),
            "BeaconChainProofs.verifyWithdrawal: Invalid slot merkle proof"
        );

        {
            // Next we verify the executionPayloadRoot against the blockRoot
            uint256 executionPayloadIndex = (BODY_ROOT_INDEX << (BEACON_BLOCK_BODY_FIELD_TREE_HEIGHT)) |
                EXECUTION_PAYLOAD_INDEX;
            require(
                Merkle.verifyInclusionSha256({
                    proof: withdrawalProof.executionPayloadProof,
                    root: withdrawalProof.blockRoot,
                    leaf: withdrawalProof.executionPayloadRoot,
                    index: executionPayloadIndex
                }),
                "BeaconChainProofs.verifyWithdrawal: Invalid executionPayload merkle proof"
            );
        }

        // Next we verify the timestampRoot against the executionPayload root
        require(
            Merkle.verifyInclusionSha256({
                proof: withdrawalProof.timestampProof,
                root: withdrawalProof.executionPayloadRoot,
                leaf: withdrawalProof.timestampRoot,
                index: TIMESTAMP_INDEX
            }),
            "BeaconChainProofs.verifyWithdrawal: Invalid timestamp merkle proof"
        );

        {
            /**
             * Next we verify the withdrawal fields against the executionPayloadRoot:
             * First we compute the withdrawal_index, then we merkleize the 
             * withdrawalFields container to calculate the withdrawalRoot.
             *
             * Note: Merkleization of the withdrawals root tree uses MerkleizeWithMixin, i.e., the length of the array is hashed with the root of
             * the array.  Thus we shift the WITHDRAWALS_INDEX over by WITHDRAWALS_TREE_HEIGHT + 1 and not just WITHDRAWALS_TREE_HEIGHT.
             */
            uint256 withdrawalIndex = (WITHDRAWALS_INDEX << (WITHDRAWALS_TREE_HEIGHT + 1)) |
                uint256(withdrawalProof.withdrawalIndex);
            bytes32 withdrawalRoot = Merkle.merkleizeSha256(withdrawalFields);
            require(
                Merkle.verifyInclusionSha256({
                    proof: withdrawalProof.withdrawalProof,
                    root: withdrawalProof.executionPayloadRoot,
                    leaf: withdrawalRoot,
                    index: withdrawalIndex
                }),
                "BeaconChainProofs.verifyWithdrawal: Invalid withdrawal merkle proof"
            );
        }
    }

    /**
     * @notice This function replicates the ssz hashing of a validator's pubkey, outlined below:
     *  hh := ssz.NewHasher()
     *  hh.PutBytes(validatorPubkey[:])
     *  validatorPubkeyHash := hh.Hash()
     *  hh.Reset()
     */
    function hashValidatorBLSPubkey(bytes memory validatorPubkey) internal pure returns (bytes32 pubkeyHash) {
        require(validatorPubkey.length == 48, "Input should be 48 bytes in length");
        return sha256(abi.encodePacked(validatorPubkey, bytes16(0)));
    }

    /**
     * @dev Retrieve the withdrawal timestamp
     */
    function getWithdrawalTimestamp(WithdrawalProof memory withdrawalProof) internal pure returns (uint64) {
        return
            Endian.fromLittleEndianUint64(withdrawalProof.timestampRoot);
    }

    /**
     * @dev Converts the withdrawal's slot to an epoch
     */
    function getWithdrawalEpoch(WithdrawalProof memory withdrawalProof) internal pure returns (uint64) {
        return
            Endian.fromLittleEndianUint64(withdrawalProof.slotRoot) / SLOTS_PER_EPOCH;
    }

    /**
     * Indices for validator fields (refer to consensus specs):
     * 0: pubkey
     * 1: withdrawal credentials
     * 2: effective balance
     * 3: slashed?
     * 4: activation elligibility epoch
     * 5: activation epoch
     * 6: exit epoch
     * 7: withdrawable epoch
     */

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

    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 a validator's withdrawable epoch
     */
    function getWithdrawableEpoch(bytes32[] memory validatorFields) internal pure returns (uint64) {
        return 
            Endian.fromLittleEndianUint64(validatorFields[VALIDATOR_WITHDRAWABLE_EPOCH_INDEX]);
    }

    /**
     * Indices for withdrawal fields (refer to consensus specs):
     * 0: withdrawal index
     * 1: validator index
     * 2: execution address
     * 3: withdrawal amount
     */

    /**
     * @dev Retrieves a withdrawal's validator index
     */
    function getValidatorIndex(bytes32[] memory withdrawalFields) internal pure returns (uint40) {
        return 
            uint40(Endian.fromLittleEndianUint64(withdrawalFields[WITHDRAWAL_VALIDATOR_INDEX_INDEX]));
    }

    /**
     * @dev Retrieves a withdrawal's withdrawal amount (in gwei)
     */
    function getWithdrawalAmountGwei(bytes32[] memory withdrawalFields) internal pure returns (uint64) {
        return
            Endian.fromLittleEndianUint64(withdrawalFields[WITHDRAWAL_VALIDATOR_AMOUNT_INDEX]);
    }
}

// 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: 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 ^0.8.0;

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);
    }
}

{
  "remappings": [
    "@openzeppelin-upgrades/=lib/openzeppelin-contracts-upgradeable/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@openzeppelin-v4.9.0/=lib/openzeppelin-contracts-v4.9.0/",
    "@openzeppelin-upgrades-v4.9.0/=lib/openzeppelin-contracts-upgradeable-v4.9.0/",
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable-v4.9.0/lib/erc4626-tests/",
    "openzeppelin-contracts-upgradeable-v4.9.0/=lib/openzeppelin-contracts-upgradeable-v4.9.0/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts-v4.9.0/=lib/openzeppelin-contracts-v4.9.0/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable-v4.9.0/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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IPauserRegistry","name":"newPauserRegistry","type":"address"}],"name":"PauserRegistrySet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"newPausedStatus","type":"uint256"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"EIGEN","outputs":[{"internalType":"contract IEigen","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[{"internalType":"uint256","name":"newShares","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"explanation","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_underlyingToken","type":"address"},{"internalType":"contract IPauserRegistry","name":"_pauserRegistry","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IEigen","name":"_EIGEN","type":"address"},{"internalType":"contract IERC20","name":"_bEIGEN","type":"address"},{"internalType":"contract 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IStrategyManager","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountUnderlying","type":"uint256"}],"name":"underlyingToShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountUnderlying","type":"uint256"}],"name":"underlyingToSharesView","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlyingToken","outputs":[{"internalType":"contract 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000000000000000000000000dfb5f6ce42aaa7830e94ecfccad411bef4d4d5b6

-----Decoded View---------------
Arg [0] : _strategyManager (address): 0xdfB5f6CE42aAA7830E94ECFCcAd411beF4d4D5b6

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dfb5f6ce42aaa7830e94ecfccad411bef4d4d5b6