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// SPDX-License-Identifier: BUSL-1.1
// Licensor: Flashstake DAO
// Licensed Works: (this contract, source below)
// Change Date: The earlier of 2026-12-01 or a date specified by Flashstake DAO publicly
// Change License: GNU General Public License v2.0 or later
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./interfaces/Flashstake/IFlashStrategy.sol";
import "./interfaces/Flashstake/IFlashFToken.sol";
import "./interfaces/RocketPool/RocketStorageInterface.sol";
import "./interfaces/RocketPool/RocketDepositPoolInterface.sol";
import "./interfaces/RocketPool/RocketTokenRETHInterface.sol";
import "./interfaces/IWETH.sol";

contract FlashStrategyRocketPool is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20Metadata;

    event BurnedFToken(address indexed _address, uint256 _tokenAmount, uint256 _yieldReturned);

    address immutable flashProtocolAddress;
    address payable constant principalTokenAddress = payable(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
    address fTokenAddress;

    uint256 principalBalance;

    RocketStorageInterface public rocketStorage;

    uint256 maxStakeDuration = 14515200;
    bool public maxStakeDurationLocked = false;

    constructor(address _flashProtocolAddress, address _rocketStorageAddress) {
        flashProtocolAddress = _flashProtocolAddress;
        rocketStorage = RocketStorageInterface(_rocketStorageAddress);
    }

    // @notice Retrieves relevant addresses as per RocketPool docs
    // @dev this can be called by anyone
    function getAddresses() public view returns(address _depositAddress, address _withdrawAddress) {
        _depositAddress = rocketStorage.getAddress(keccak256(abi.encodePacked("contract.address", "rocketDepositPool")));
        _withdrawAddress = rocketStorage.getAddress(keccak256(abi.encodePacked("contract.address", "rocketTokenRETH")));
    }

    // @notice Allows Flashstake Protocol to deposit principal tokens
    // @dev this can only be called by the Flashstake Protocol
    function depositPrincipal(uint256 _tokenAmount) external onlyAuthorised returns (uint256) {
        IWETH(principalTokenAddress).approve(principalTokenAddress, _tokenAmount);
        IWETH(principalTokenAddress).withdraw(_tokenAmount);

        (address _depositAddress, address _withdrawAddress) = getAddresses();

        uint256 rETHBefore = IERC20Metadata(_withdrawAddress).balanceOf(address(this));
        RocketDepositPoolInterface(_depositAddress).deposit{ value: address(this).balance }();
        uint256 rETHAfter = IERC20Metadata(_withdrawAddress).balanceOf(address(this));

        uint256 redeemableValue = RocketTokenRETHInterface(_withdrawAddress).getEthValue(rETHAfter - rETHBefore);

        principalBalance += redeemableValue;

        return redeemableValue;
    }

    // @notice Allows Flashstake Protocol to withdraw principal tokens
    // @dev this can only be called by the Flashstake Protocol
    function withdrawPrincipal(uint256 _tokenAmount) external onlyAuthorised {
        require(_tokenAmount <= principalBalance, "WITHDRAW TOO HIGH");

        (, address _withdrawAddress) = getAddresses();
        uint256 rETHtoBurn = ((_tokenAmount * 10**18) / RocketTokenRETHInterface(_withdrawAddress).getExchangeRate()) + 1;

        RocketTokenRETHInterface(_withdrawAddress).approve(_withdrawAddress, rETHtoBurn);
        RocketTokenRETHInterface(_withdrawAddress).burn(rETHtoBurn);

        IWETH(principalTokenAddress).deposit{ value: address(this).balance }();
        IERC20Metadata(principalTokenAddress).safeTransfer(msg.sender, _tokenAmount);

        principalBalance -= _tokenAmount;
    }

    // @notice retrieve the total principal locked within this strategy
    function getPrincipalBalance() public view returns (uint256) {
        return principalBalance;
    }

    // @notice retrieve the total amount of yield currently in the yield pool
    function getYieldBalance() public view returns (uint256) {
        (, address _withdrawAddress) = getAddresses();

        uint256 totalrETHBalance = RocketTokenRETHInterface(_withdrawAddress).balanceOf(address(this));
        uint256 totalEtherBalance = RocketTokenRETHInterface(_withdrawAddress).getEthValue(totalrETHBalance);

        if(principalBalance > totalEtherBalance) {
            return 0;
        }

        // Yield balance is the difference between total redeemable and principalBalance (as recorded)
        return totalEtherBalance - principalBalance;
    }

    // @notice retrieve the principal token address this strategy accepts
    function getPrincipalAddress() external view returns (address) {
        return principalTokenAddress;
    }

    // @notice retrieve the fToken address associated with this strategy
    function getFTokenAddress() external view returns (address) {
        return fTokenAddress;
    }

    // @notice sets the fToken address
    // @dev this can only be called once when registering the strategy against the Flashstake Protocol
    // @dev this can only be called by the Flashstake Protocol
    function setFTokenAddress(address _fTokenAddress) external onlyAuthorised {
        require(fTokenAddress == address(0), "FTOKEN ADDRESS ALREADY SET");
        fTokenAddress = _fTokenAddress;
    }

    // @notice returns the number of fTokens to mint given some principal and duration
    // @dev this can only be called by anyone
    function quoteMintFToken(uint256 _tokenAmount, uint256 _duration) external pure returns (uint256) {
        // Enforce minimum _duration
        require(_duration >= 60, "DURATION TOO LOW");

        // 1 ERC20 for 365 DAYS = 1 fERC20
        // 1 second = 0.000000031709792000
        // eg (100000000000000000 * (1 second * 31709792000)) / 10**18
        uint256 amountToMint = (_tokenAmount * (_duration * 31709792000)) / (10**18);

        return amountToMint;
    }

    // @notice returns the number (estimate) of principal tokens returned when burning some amount of fTokens
    // @dev this can only be called by anyone with fTokens
    function quoteBurnFToken(uint256 _tokenAmount) public view returns (uint256) {
        uint256 totalSupply = IERC20Metadata(fTokenAddress).totalSupply();
        require(totalSupply > 0, "INSUFFICIENT fERC20 TOKEN SUPPLY");

        if (_tokenAmount > totalSupply) {
            _tokenAmount = totalSupply;
        }

        uint256 totalYield = getYieldBalance();
        return (totalYield * _tokenAmount) / totalSupply;
    }

    // @notice burns fTokens to redeem yield from yield pool
    // @dev this can only be called by anyone with fTokens
    function burnFToken(
        uint256 _tokenAmount,
        uint256 _minimumReturned,
        address _yieldTo
    ) external nonReentrant returns (uint256) {

        uint256 tokensOwed = quoteBurnFToken(_tokenAmount);
        require(tokensOwed >= _minimumReturned, "INSUFFICIENT OUTPUT");

        IFlashFToken(fTokenAddress).burnFrom(msg.sender, _tokenAmount);

        // Withdraw the yield
        (, address _withdrawAddress) = getAddresses();
        uint256 rETHtoBurn = ((tokensOwed * 10**18) / RocketTokenRETHInterface(_withdrawAddress).getExchangeRate()) + 1;

        RocketTokenRETHInterface(_withdrawAddress).approve(_withdrawAddress, rETHtoBurn);
        RocketTokenRETHInterface(_withdrawAddress).burn(rETHtoBurn);
        IWETH(principalTokenAddress).deposit{ value: address(this).balance }();

        IERC20Metadata(principalTokenAddress).safeTransfer(_yieldTo, tokensOwed);

        emit BurnedFToken(msg.sender, _tokenAmount, tokensOwed);

        return tokensOwed;
    }

    modifier onlyAuthorised() {
        require(msg.sender == flashProtocolAddress || msg.sender == address(this), "NOT FLASH PROTOCOL");
        _;
    }

    // @notice withdraw any ERC20 token in this strategy that is not the principal or share token
    // @dev this can only be called by the strategy owner
    function withdrawERC20(address[] calldata _tokenAddresses, uint256[] calldata _tokenAmounts) external onlyOwner {
        require(_tokenAddresses.length == _tokenAmounts.length, "ARRAY SIZE MISMATCH");
        (, address _withdrawAddress) = getAddresses();

        for (uint256 i = 0; i < _tokenAddresses.length; i++) {
            // Ensure the token being withdrawn is not the principal token
            require(_tokenAddresses[i] != principalTokenAddress &&
                _tokenAddresses[i] != _withdrawAddress, "TOKEN ADDRESS PROHIBITED");

            // Transfer the token to the caller
            IERC20Metadata(_tokenAddresses[i]).safeTransfer(msg.sender, _tokenAmounts[i]);
        }
    }

    // @notice retrieve the maximum stake duration in seconds
    // @dev this is usually called by the Flashstake Protocol
    function getMaxStakeDuration() public view returns (uint256) {
        return maxStakeDuration;
    }

    // @notice sets the new maximum stake duration
    // @dev this can only be called by the strategy owner
    function setMaxStakeDuration(uint256 _newMaxStakeDuration) external onlyOwner {
        require(maxStakeDurationLocked == false);
        maxStakeDuration = _newMaxStakeDuration;
    }

    // @notice permanently locks the max stake duration
    // @dev this can only be called by the strategy owner
    function lockMaxStakeDuration() external onlyOwner {
        maxStakeDurationLocked = true;
    }

    fallback() external payable {}
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

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

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

// 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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

interface IFlashFToken {
    function mint(address account, uint256 amount) external;

    function burnFrom(address from, uint256 amount) external;

    function decimals() external returns (uint8);
}

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

interface IFlashStrategy {
    event BurnedFToken(address indexed _address, uint256 _tokenAmount, uint256 _yieldReturned);

    // This is how principal will be deposited into the contract
    // The Flash protocol allows the strategy to specify how much
    // should be registered. This allows the strategy to manipulate (eg take fee)
    // on the principal if the strategy requires
    function depositPrincipal(uint256 _tokenAmount) external returns (uint256);

    // This is how principal will be returned from the contract
    function withdrawPrincipal(uint256 _tokenAmount) external;

    // Responsible for instant upfront yield. Takes fERC20 tokens specific to this
    // strategy. The strategy is responsible for returning some amount of principal tokens
    function burnFToken(
        uint256 _tokenAmount,
        uint256 _minimumReturned,
        address _yieldTo
    ) external returns (uint256);

    // This should return the current total of all principal within the contract
    function getPrincipalBalance() external view returns (uint256);

    // This should return the current total of all yield generated to date (including bootstrapped tokens)
    function getYieldBalance() external view returns (uint256);

    // This should return the principal token address (eg DAI)
    function getPrincipalAddress() external view returns (address);

    // View function which quotes how many principal tokens would be returned if x
    // fERC20 tokens are burned
    function quoteMintFToken(uint256 _tokenAmount, uint256 duration) external view returns (uint256);

    // View function which quotes how many principal tokens would be returned if x
    // fERC20 tokens are burned
    // IMPORTANT NOTE: This should utilise bootstrap tokens if they exist
    // bootstrapped tokens are any principal tokens that exist within the smart contract
    function quoteBurnFToken(uint256 _tokenAmount) external view returns (uint256);

    // The function to set the fERC20 address within the strategy
    function setFTokenAddress(address _fTokenAddress) external;

    // This should return what the maximum stake duration is
    function getMaxStakeDuration() external view returns (uint256);

    function getFTokenAddress() external view returns (address);
}

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

interface IWETH {
    function name() external view returns (string memory);

    function approve(address guy, uint256 wad) external returns (bool);

    function totalSupply() external view returns (uint256);

    function transferFrom(
        address src,
        address dst,
        uint256 wad
    ) external returns (bool);

    function withdraw(uint256 wad) external;

    function decimals() external view returns (uint8);

    function balanceOf(address) external view returns (uint256);

    function symbol() external view returns (string memory);

    function transfer(address dst, uint256 wad) external returns (bool);

    function deposit() external payable;

    function allowance(address, address) external view returns (uint256);

    fallback() external payable;

    event Approval(address indexed src, address indexed guy, uint256 wad);
    event Transfer(address indexed src, address indexed dst, uint256 wad);
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);
}

/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity >0.5.0 <0.9.0;

// SPDX-License-Identifier: GPL-3.0-only

interface RocketDepositPoolInterface {
    function getBalance() external view returns (uint256);
    function getNodeBalance() external view returns (uint256);
    function getUserBalance() external view returns (int256);
    function getExcessBalance() external view returns (uint256);
    function deposit() external payable;
    function getMaximumDepositAmount() external view returns (uint256);
    function nodeDeposit(uint256 _totalAmount) external payable;
    function nodeCreditWithdrawal(uint256 _amount) external;
    function recycleDissolvedDeposit() external payable;
    function recycleExcessCollateral() external payable;
    function recycleLiquidatedStake() external payable;
    function assignDeposits() external;
    function maybeAssignDeposits() external returns (bool);
    function withdrawExcessBalance(uint256 _amount) external;
}

pragma solidity >0.5.0 <0.9.0;

// SPDX-License-Identifier: GPL-3.0-only

interface RocketStorageInterface {

    // Deploy status
    function getDeployedStatus() external view returns (bool);

    // Guardian
    function getGuardian() external view returns(address);
    function setGuardian(address _newAddress) external;
    function confirmGuardian() external;

    // Getters
    function getAddress(bytes32 _key) external view returns (address);
    function getUint(bytes32 _key) external view returns (uint);
    function getString(bytes32 _key) external view returns (string memory);
    function getBytes(bytes32 _key) external view returns (bytes memory);
    function getBool(bytes32 _key) external view returns (bool);
    function getInt(bytes32 _key) external view returns (int);
    function getBytes32(bytes32 _key) external view returns (bytes32);

    // Setters
    function setAddress(bytes32 _key, address _value) external;
    function setUint(bytes32 _key, uint _value) external;
    function setString(bytes32 _key, string calldata _value) external;
    function setBytes(bytes32 _key, bytes calldata _value) external;
    function setBool(bytes32 _key, bool _value) external;
    function setInt(bytes32 _key, int _value) external;
    function setBytes32(bytes32 _key, bytes32 _value) external;

    // Deleters
    function deleteAddress(bytes32 _key) external;
    function deleteUint(bytes32 _key) external;
    function deleteString(bytes32 _key) external;
    function deleteBytes(bytes32 _key) external;
    function deleteBool(bytes32 _key) external;
    function deleteInt(bytes32 _key) external;
    function deleteBytes32(bytes32 _key) external;

    // Arithmetic
    function addUint(bytes32 _key, uint256 _amount) external;
    function subUint(bytes32 _key, uint256 _amount) external;

    // Protected storage
    function getNodeWithdrawalAddress(address _nodeAddress) external view returns (address);
    function getNodePendingWithdrawalAddress(address _nodeAddress) external view returns (address);
    function setWithdrawalAddress(address _nodeAddress, address _newWithdrawalAddress, bool _confirm) external;
    function confirmWithdrawalAddress(address _nodeAddress) external;
}

pragma solidity >0.5.0 <0.9.0;

// SPDX-License-Identifier: GPL-3.0-only

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

interface RocketTokenRETHInterface is IERC20 {
    function getEthValue(uint256 _rethAmount) external view returns (uint256);
    function getRethValue(uint256 _ethAmount) external view returns (uint256);
    function getExchangeRate() external view returns (uint256);
    function getTotalCollateral() external view returns (uint256);
    function getCollateralRate() external view returns (uint256);
    function depositExcess() external payable;
    function depositExcessCollateral() external;
    function mint(uint256 _ethAmount, address _to) external;
    function burn(uint256 _rethAmount) external;
}

{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_flashProtocolAddress","type":"address"},{"internalType":"address","name":"_rocketStorageAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_address","type":"address"},{"indexed":false,"internalType":"uint256","name":"_tokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_yieldReturned","type":"uint256"}],"name":"BurnedFToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"uint256","name":"_tokenAmount","type":"uint256"},{"internalType":"uint256","name":"_minimumReturned","type":"uint256"},{"internalType":"address","name":"_yieldTo","type":"address"}],"name":"burnFToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenAmount","type":"uint256"}],"name":"depositPrincipal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getAddresses","outputs":[{"internalType":"address","name":"_depositAddress","type":"address"},{"internalType":"address","name":"_withdrawAddress","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFTokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getMaxStakeDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPrincipalAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPrincipalBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getYieldBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockMaxStakeDuration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maxStakeDurationLocked","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenAmount","type":"uint256"}],"name":"quoteBurnFToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenAmount","type":"uint256"},{"internalType":"uint256","name":"_duration","type":"uint256"}],"name":"quoteMintFToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rocketStorage","outputs":[{"internalType":"contract RocketStorageInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_fTokenAddress","type":"address"}],"name":"setFTokenAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaxStakeDuration","type":"uint256"}],"name":"setMaxStakeDuration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_tokenAddresses","type":"address[]"},{"internalType":"uint256[]","name":"_tokenAmounts","type":"uint256[]"}],"name":"withdrawERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenAmount","type":"uint256"}],"name":"withdrawPrincipal","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000078b2d65dd1d3d9fb2972d7ef467261ca101ec2b90000000000000000000000001d8f8f00cfa6758d7be78336684788fb0ee0fa46

-----Decoded View---------------
Arg [0] : _flashProtocolAddress (address): 0x78b2d65dd1d3d9Fb2972d7Ef467261Ca101EC2B9
Arg [1] : _rocketStorageAddress (address): 0x1d8f8f00cfa6758d7bE78336684788Fb0ee0Fa46

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000078b2d65dd1d3d9fb2972d7ef467261ca101ec2b9
Arg [1] : 0000000000000000000000001d8f8f00cfa6758d7be78336684788fb0ee0fa46