// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev These functions deal with verification of Merkle trees (hash trees),
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./ERC20.sol";
/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");
        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @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);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "../interface/RocketStorageInterface.sol";
/// @title Base settings / modifiers for each contract in Rocket Pool
/// @author David Rugendyke
abstract contract RocketBase {
    // Calculate using this as the base
    uint256 constant calcBase = 1 ether;
    // Version of the contract
    uint8 public version;
    // The main storage contract where primary persistant storage is maintained
    RocketStorageInterface rocketStorage = RocketStorageInterface(0);
    /*** Modifiers **********************************************************/
    /**
    * @dev Throws if called by any sender that doesn't match a Rocket Pool network contract
    */
    modifier onlyLatestNetworkContract() {
        require(getBool(keccak256(abi.encodePacked("contract.exists", msg.sender))), "Invalid or outdated network contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that doesn't match one of the supplied contract or is the latest version of that contract
    */
    modifier onlyLatestContract(string memory _contractName, address _contractAddress) {
        require(_contractAddress == getAddress(keccak256(abi.encodePacked("contract.address", _contractName))), "Invalid or outdated contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered node
    */
    modifier onlyRegisteredNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("node.exists", _nodeAddress))), "Invalid node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a trusted node DAO member
    */
    modifier onlyTrustedNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("dao.trustednodes.", "member", _nodeAddress))), "Invalid trusted node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered minipool
    */
    modifier onlyRegisteredMinipool(address _minipoolAddress) {
        require(getBool(keccak256(abi.encodePacked("minipool.exists", _minipoolAddress))), "Invalid minipool");
        _;
    }
    
    /**
    * @dev Throws if called by any account other than a guardian account (temporary account allowed access to settings before DAO is fully enabled)
    */
    modifier onlyGuardian() {
        require(msg.sender == rocketStorage.getGuardian(), "Account is not a temporary guardian");
        _;
    }
    /*** Methods **********************************************************/
    /// @dev Set the main Rocket Storage address
    constructor(RocketStorageInterface _rocketStorageAddress) {
        // Update the contract address
        rocketStorage = RocketStorageInterface(_rocketStorageAddress);
    }
    /// @dev Get the address of a network contract by name
    function getContractAddress(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Check it
        require(contractAddress != address(0x0), "Contract not found");
        // Return
        return contractAddress;
    }
    /// @dev Get the address of a network contract by name (returns address(0x0) instead of reverting if contract does not exist)
    function getContractAddressUnsafe(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Return
        return contractAddress;
    }
    /// @dev Get the name of a network contract by address
    function getContractName(address _contractAddress) internal view returns (string memory) {
        // Get the contract name
        string memory contractName = getString(keccak256(abi.encodePacked("contract.name", _contractAddress)));
        // Check it
        require(bytes(contractName).length > 0, "Contract not found");
        // Return
        return contractName;
    }
    /// @dev Get revert error message from a .call method
    function getRevertMsg(bytes memory _returnData) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (_returnData.length < 68) return "Transaction reverted silently";
        assembly {
            // Slice the sighash.
            _returnData := add(_returnData, 0x04)
        }
        return abi.decode(_returnData, (string)); // All that remains is the revert string
    }
    /*** Rocket Storage Methods ****************************************/
    // Note: Unused helpers have been removed to keep contract sizes down
    /// @dev Storage get methods
    function getAddress(bytes32 _key) internal view returns (address) { return rocketStorage.getAddress(_key); }
    function getUint(bytes32 _key) internal view returns (uint) { return rocketStorage.getUint(_key); }
    function getString(bytes32 _key) internal view returns (string memory) { return rocketStorage.getString(_key); }
    function getBytes(bytes32 _key) internal view returns (bytes memory) { return rocketStorage.getBytes(_key); }
    function getBool(bytes32 _key) internal view returns (bool) { return rocketStorage.getBool(_key); }
    function getInt(bytes32 _key) internal view returns (int) { return rocketStorage.getInt(_key); }
    function getBytes32(bytes32 _key) internal view returns (bytes32) { return rocketStorage.getBytes32(_key); }
    /// @dev Storage set methods
    function setAddress(bytes32 _key, address _value) internal { rocketStorage.setAddress(_key, _value); }
    function setUint(bytes32 _key, uint _value) internal { rocketStorage.setUint(_key, _value); }
    function setString(bytes32 _key, string memory _value) internal { rocketStorage.setString(_key, _value); }
    function setBytes(bytes32 _key, bytes memory _value) internal { rocketStorage.setBytes(_key, _value); }
    function setBool(bytes32 _key, bool _value) internal { rocketStorage.setBool(_key, _value); }
    function setInt(bytes32 _key, int _value) internal { rocketStorage.setInt(_key, _value); }
    function setBytes32(bytes32 _key, bytes32 _value) internal { rocketStorage.setBytes32(_key, _value); }
    /// @dev Storage delete methods
    function deleteAddress(bytes32 _key) internal { rocketStorage.deleteAddress(_key); }
    function deleteUint(bytes32 _key) internal { rocketStorage.deleteUint(_key); }
    function deleteString(bytes32 _key) internal { rocketStorage.deleteString(_key); }
    function deleteBytes(bytes32 _key) internal { rocketStorage.deleteBytes(_key); }
    function deleteBool(bytes32 _key) internal { rocketStorage.deleteBool(_key); }
    function deleteInt(bytes32 _key) internal { rocketStorage.deleteInt(_key); }
    function deleteBytes32(bytes32 _key) internal { rocketStorage.deleteBytes32(_key); }
    /// @dev Storage arithmetic methods
    function addUint(bytes32 _key, uint256 _amount) internal { rocketStorage.addUint(_key, _amount); }
    function subUint(bytes32 _key, uint256 _amount) internal { rocketStorage.subUint(_key, _amount); }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
pragma abicoder v2;
// SPDX-License-Identifier: GPL-3.0-only
import "../RocketBase.sol";
import "../../interface/token/RocketTokenRPLInterface.sol";
import "../../interface/RocketVaultInterface.sol";
import "../../interface/node/RocketNodeStakingInterface.sol";
import "../../interface/rewards/RocketRewardsRelayInterface.sol";
import "../../interface/rewards/RocketSmoothingPoolInterface.sol";
import "../../interface/RocketVaultWithdrawerInterface.sol";
import "@openzeppelin/contracts/cryptography/MerkleProof.sol";
/*
* On mainnet, the relay and the distributor are the same contract as there is no need for an intermediate contract to
* handle cross-chain messaging.
*/
contract RocketMerkleDistributorMainnet is RocketBase, RocketRewardsRelayInterface, RocketVaultWithdrawerInterface {
    // Libs
    using SafeMath for uint;
    // Events
    event RewardsClaimed(address indexed claimer, uint256[] rewardIndex, uint256[] amountRPL, uint256[] amountETH);
    // Constants
    uint256 constant network = 0;
    // Immutables
    bytes32 immutable rocketVaultKey;
    bytes32 immutable rocketTokenRPLKey;
    // Allow receiving ETH
    receive() payable external {}
    // Construct
    constructor(RocketStorageInterface _rocketStorageAddress) RocketBase(_rocketStorageAddress) {
        // Version
        version = 1;
        // Precompute keys
        rocketVaultKey = keccak256(abi.encodePacked("contract.address", "rocketVault"));
        rocketTokenRPLKey = keccak256(abi.encodePacked("contract.address", "rocketTokenRPL"));
    }
    // Called by RocketRewardsPool to include a snapshot into this distributor
    function relayRewards(uint256 _rewardIndex, bytes32 _root, uint256 _rewardsRPL, uint256 _rewardsETH) external override onlyLatestContract("rocketMerkleDistributorMainnet", address(this)) onlyLatestContract("rocketRewardsPool", msg.sender) {
        bytes32 key = keccak256(abi.encodePacked('rewards.merkle.root', _rewardIndex));
        require(getBytes32(key) == bytes32(0));
        setBytes32(key, _root);
        // Send the ETH and RPL to the vault
        RocketVaultInterface rocketVault = RocketVaultInterface(getAddress(rocketVaultKey));
        if (_rewardsETH > 0) {
            rocketVault.depositEther{value: _rewardsETH}();
        }
        if (_rewardsRPL > 0) {
            IERC20 rocketTokenRPL = IERC20(getAddress(rocketTokenRPLKey));
            rocketTokenRPL.approve(address(rocketVault), _rewardsRPL);
            rocketVault.depositToken("rocketMerkleDistributorMainnet", rocketTokenRPL, _rewardsRPL);
        }
    }
    // Reward recipients can call this method with a merkle proof to claim rewards for one or more reward intervals
    function claim(address _nodeAddress, uint256[] calldata _rewardIndex, uint256[] calldata _amountRPL, uint256[] calldata _amountETH, bytes32[][] calldata _merkleProof) external override {
        claimAndStake(_nodeAddress, _rewardIndex, _amountRPL, _amountETH, _merkleProof, 0);
    }
    // Node operators can call this method to claim rewards for one or more reward intervals and specify an amount of RPL to stake at the same time
    function claimAndStake(address _nodeAddress, uint256[] calldata _rewardIndex, uint256[] calldata _amountRPL, uint256[] calldata _amountETH, bytes32[][] calldata _merkleProof, uint256 _stakeAmount) public override {
        // Get contracts
        RocketVaultInterface rocketVault = RocketVaultInterface(getAddress(rocketVaultKey));
        address rocketTokenRPLAddress = getAddress(rocketTokenRPLKey);
        // Verify claims
        _claim(_rewardIndex, _nodeAddress, _amountRPL, _amountETH, _merkleProof);
        {
            // Get withdrawal address
            address withdrawalAddress = rocketStorage.getNodeWithdrawalAddress(_nodeAddress);
            require(msg.sender == _nodeAddress || msg.sender == withdrawalAddress, "Can only claim from node or withdrawal address");
            // Calculate totals
            uint256 totalAmountRPL = 0;
            uint256 totalAmountETH = 0;
            for (uint256 i = 0; i < _rewardIndex.length; i++) {
                totalAmountRPL = totalAmountRPL.add(_amountRPL[i]);
                totalAmountETH = totalAmountETH.add(_amountETH[i]);
            }
            // Validate input
            require(_stakeAmount <= totalAmountRPL, "Invalid stake amount");
            // Distribute any remaining tokens to the node's withdrawal address
            uint256 remaining = totalAmountRPL.sub(_stakeAmount);
            if (remaining > 0) {
                rocketVault.withdrawToken(withdrawalAddress, IERC20(rocketTokenRPLAddress), remaining);
            }
            // Distribute ETH
            if (totalAmountETH > 0) {
                rocketVault.withdrawEther(totalAmountETH);
                (bool result,) = withdrawalAddress.call{value: totalAmountETH}("");
                require(result, "Failed to claim ETH");
            }
        }
        // Restake requested amount
        if (_stakeAmount > 0) {
            RocketTokenRPLInterface rocketTokenRPL = RocketTokenRPLInterface(rocketTokenRPLAddress);
            RocketNodeStakingInterface rocketNodeStaking = RocketNodeStakingInterface(getContractAddress("rocketNodeStaking"));
            rocketVault.withdrawToken(address(this), IERC20(rocketTokenRPLAddress), _stakeAmount);
            rocketTokenRPL.approve(address(rocketNodeStaking), _stakeAmount);
            rocketNodeStaking.stakeRPLFor(_nodeAddress, _stakeAmount);
        }
        // Emit event
        emit RewardsClaimed(_nodeAddress, _rewardIndex, _amountRPL, _amountETH);
    }
    // Verifies the given data exists as a leaf nodes for the specified reward interval and marks them as claimed if they are valid
    // Note: this function is optimised for gas when _rewardIndex is ordered numerically
    function _claim(uint256[] calldata _rewardIndex, address _nodeAddress, uint256[] calldata _amountRPL, uint256[] calldata _amountETH, bytes32[][] calldata _merkleProof) internal {
        // Set initial parameters to the first reward index in the array
        uint256 indexWordIndex = _rewardIndex[0] / 256;
        bytes32 claimedWordKey = keccak256(abi.encodePacked('rewards.interval.claimed', _nodeAddress, indexWordIndex));
        uint256 claimedWord = getUint(claimedWordKey);
        // Loop over every entry
        for (uint256 i = 0; i < _rewardIndex.length; i++) {
            // Prevent accidental claim of 0
            require(_amountRPL[i] > 0 || _amountETH[i] > 0, "Invalid amount");
            // Check if this entry has a different word index than the previous
            if (indexWordIndex != _rewardIndex[i] / 256) {
                // Store the previous word
                setUint(claimedWordKey, claimedWord);
                // Load the word for this entry
                indexWordIndex = _rewardIndex[i] / 256;
                claimedWordKey = keccak256(abi.encodePacked('rewards.interval.claimed', _nodeAddress, indexWordIndex));
                claimedWord = getUint(claimedWordKey);
            }
            // Calculate the bit index for this entry
            uint256 indexBitIndex = _rewardIndex[i] % 256;
            // Ensure the bit is not yet set on this word
            uint256 mask = (1 << indexBitIndex);
            require(claimedWord & mask != mask, "Already claimed");
            // Verify the merkle proof
            require(_verifyProof(_rewardIndex[i], _nodeAddress, _amountRPL[i], _amountETH[i], _merkleProof[i]), "Invalid proof");
            // Set the bit for the current reward index
            claimedWord = claimedWord | (1 << indexBitIndex);
        }
        // Store the word
        setUint(claimedWordKey, claimedWord);
    }
    // Verifies that the
    function _verifyProof(uint256 _rewardIndex, address _nodeAddress, uint256 _amountRPL, uint256 _amountETH, bytes32[] calldata _merkleProof) internal view returns (bool) {
        bytes32 node = keccak256(abi.encodePacked(_nodeAddress, network, _amountRPL, _amountETH));
        bytes32 key = keccak256(abi.encodePacked('rewards.merkle.root', _rewardIndex));
        bytes32 merkleRoot = getBytes32(key);
        return MerkleProof.verify(_merkleProof, merkleRoot, node);
    }
    // Returns true if the given claimer has claimed for the given reward interval
    function isClaimed(uint256 _rewardIndex, address _claimer) public override view returns (bool) {
        uint256 indexWordIndex = _rewardIndex / 256;
        uint256 indexBitIndex = _rewardIndex % 256;
        uint256 claimedWord = getUint(keccak256(abi.encodePacked('rewards.interval.claimed', _claimer, indexWordIndex)));
        uint256 mask = (1 << indexBitIndex);
        return claimedWord & mask == mask;
    }
    // Allow receiving ETH from RocketVault, no action required
    function receiveVaultWithdrawalETH() external override payable {}
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// 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;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
interface RocketVaultInterface {
    function balanceOf(string memory _networkContractName) external view returns (uint256);
    function depositEther() external payable;
    function withdrawEther(uint256 _amount) external;
    function depositToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function withdrawToken(address _withdrawalAddress, IERC20 _tokenAddress, uint256 _amount) external;
    function balanceOfToken(string memory _networkContractName, IERC20 _tokenAddress) external view returns (uint256);
    function transferToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function burnToken(ERC20Burnable _tokenAddress, uint256 _amount) external;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketVaultWithdrawerInterface {
    function receiveVaultWithdrawalETH() external payable; 
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketNodeStakingInterface {
    function getTotalRPLStake() external view returns (uint256);
    function getNodeRPLStake(address _nodeAddress) external view returns (uint256);
    function getNodeRPLStakedTime(address _nodeAddress) external view returns (uint256);
    function getTotalEffectiveRPLStake() external view returns (uint256);
    function calculateTotalEffectiveRPLStake(uint256 offset, uint256 limit, uint256 rplPrice) external view returns (uint256);
    function getNodeEffectiveRPLStake(address _nodeAddress) external view returns (uint256);
    function getNodeMinimumRPLStake(address _nodeAddress) external view returns (uint256);
    function getNodeMaximumRPLStake(address _nodeAddress) external view returns (uint256);
    function getNodeMinipoolLimit(address _nodeAddress) external view returns (uint256);
    function stakeRPL(uint256 _amount) external;
    function stakeRPLFor(address _nodeAddress, uint256 _amount) external;
    function withdrawRPL(uint256 _amount) external;
    function slashRPL(address _nodeAddress, uint256 _ethSlashAmount) external;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
pragma abicoder v2;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketRewardsRelayInterface {
    function relayRewards(uint256 _intervalIndex, bytes32 _merkleRoot, uint256 _rewardsRPL, uint256 _rewardsETH) external;
    function claim(address _nodeAddress, uint256[] calldata _intervalIndex, uint256[] calldata _amountRPL, uint256[] calldata _amountETH, bytes32[][] calldata _merkleProof) external;
    function claimAndStake(address _nodeAddress, uint256[] calldata _intervalIndex, uint256[] calldata _amountRPL, uint256[] calldata _amountETH, bytes32[][] calldata _merkleProof, uint256 _stakeAmount) external;
    function isClaimed(uint256 _intervalIndex, address _claimer) external view returns (bool);
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
pragma abicoder v2;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketSmoothingPoolInterface {
    function withdrawEther(address _to, uint256 _amount) external;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface RocketTokenRPLInterface is IERC20 {
    function getInflationCalcTime() external view returns(uint256);
    function getInflationIntervalTime() external view returns(uint256);
    function getInflationIntervalRate() external view returns(uint256);
    function getInflationIntervalsPassed() external view returns(uint256);
    function getInflationIntervalStartTime() external view returns(uint256);
    function getInflationRewardsContractAddress() external view returns(address);
    function inflationCalculate() external view returns (uint256);
    function inflationMintTokens() external returns (uint256);
    function swapTokens(uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./ERC20.sol";
/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");
        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @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);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;
/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");
        // solhint-disable-next-line avoid-low-level-calls
        (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");
        // solhint-disable-next-line avoid-low-level-calls
        (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");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "../interface/RocketStorageInterface.sol";
/// @title Base settings / modifiers for each contract in Rocket Pool
/// @author David Rugendyke
abstract contract RocketBase {
    // Calculate using this as the base
    uint256 constant calcBase = 1 ether;
    // Version of the contract
    uint8 public version;
    // The main storage contract where primary persistant storage is maintained
    RocketStorageInterface rocketStorage = RocketStorageInterface(0);
    /*** Modifiers **********************************************************/
    /**
    * @dev Throws if called by any sender that doesn't match a Rocket Pool network contract
    */
    modifier onlyLatestNetworkContract() {
        require(getBool(keccak256(abi.encodePacked("contract.exists", msg.sender))), "Invalid or outdated network contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that doesn't match one of the supplied contract or is the latest version of that contract
    */
    modifier onlyLatestContract(string memory _contractName, address _contractAddress) {
        require(_contractAddress == getAddress(keccak256(abi.encodePacked("contract.address", _contractName))), "Invalid or outdated contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered node
    */
    modifier onlyRegisteredNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("node.exists", _nodeAddress))), "Invalid node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a trusted node DAO member
    */
    modifier onlyTrustedNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("dao.trustednodes.", "member", _nodeAddress))), "Invalid trusted node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered minipool
    */
    modifier onlyRegisteredMinipool(address _minipoolAddress) {
        require(getBool(keccak256(abi.encodePacked("minipool.exists", _minipoolAddress))), "Invalid minipool");
        _;
    }
    
    /**
    * @dev Throws if called by any account other than a guardian account (temporary account allowed access to settings before DAO is fully enabled)
    */
    modifier onlyGuardian() {
        require(msg.sender == rocketStorage.getGuardian(), "Account is not a temporary guardian");
        _;
    }
    /*** Methods **********************************************************/
    /// @dev Set the main Rocket Storage address
    constructor(RocketStorageInterface _rocketStorageAddress) {
        // Update the contract address
        rocketStorage = RocketStorageInterface(_rocketStorageAddress);
    }
    /// @dev Get the address of a network contract by name
    function getContractAddress(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Check it
        require(contractAddress != address(0x0), "Contract not found");
        // Return
        return contractAddress;
    }
    /// @dev Get the address of a network contract by name (returns address(0x0) instead of reverting if contract does not exist)
    function getContractAddressUnsafe(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Return
        return contractAddress;
    }
    /// @dev Get the name of a network contract by address
    function getContractName(address _contractAddress) internal view returns (string memory) {
        // Get the contract name
        string memory contractName = getString(keccak256(abi.encodePacked("contract.name", _contractAddress)));
        // Check it
        require(bytes(contractName).length > 0, "Contract not found");
        // Return
        return contractName;
    }
    /// @dev Get revert error message from a .call method
    function getRevertMsg(bytes memory _returnData) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (_returnData.length < 68) return "Transaction reverted silently";
        assembly {
            // Slice the sighash.
            _returnData := add(_returnData, 0x04)
        }
        return abi.decode(_returnData, (string)); // All that remains is the revert string
    }
    /*** Rocket Storage Methods ****************************************/
    // Note: Unused helpers have been removed to keep contract sizes down
    /// @dev Storage get methods
    function getAddress(bytes32 _key) internal view returns (address) { return rocketStorage.getAddress(_key); }
    function getUint(bytes32 _key) internal view returns (uint) { return rocketStorage.getUint(_key); }
    function getString(bytes32 _key) internal view returns (string memory) { return rocketStorage.getString(_key); }
    function getBytes(bytes32 _key) internal view returns (bytes memory) { return rocketStorage.getBytes(_key); }
    function getBool(bytes32 _key) internal view returns (bool) { return rocketStorage.getBool(_key); }
    function getInt(bytes32 _key) internal view returns (int) { return rocketStorage.getInt(_key); }
    function getBytes32(bytes32 _key) internal view returns (bytes32) { return rocketStorage.getBytes32(_key); }
    /// @dev Storage set methods
    function setAddress(bytes32 _key, address _value) internal { rocketStorage.setAddress(_key, _value); }
    function setUint(bytes32 _key, uint _value) internal { rocketStorage.setUint(_key, _value); }
    function setString(bytes32 _key, string memory _value) internal { rocketStorage.setString(_key, _value); }
    function setBytes(bytes32 _key, bytes memory _value) internal { rocketStorage.setBytes(_key, _value); }
    function setBool(bytes32 _key, bool _value) internal { rocketStorage.setBool(_key, _value); }
    function setInt(bytes32 _key, int _value) internal { rocketStorage.setInt(_key, _value); }
    function setBytes32(bytes32 _key, bytes32 _value) internal { rocketStorage.setBytes32(_key, _value); }
    /// @dev Storage delete methods
    function deleteAddress(bytes32 _key) internal { rocketStorage.deleteAddress(_key); }
    function deleteUint(bytes32 _key) internal { rocketStorage.deleteUint(_key); }
    function deleteString(bytes32 _key) internal { rocketStorage.deleteString(_key); }
    function deleteBytes(bytes32 _key) internal { rocketStorage.deleteBytes(_key); }
    function deleteBool(bytes32 _key) internal { rocketStorage.deleteBool(_key); }
    function deleteInt(bytes32 _key) internal { rocketStorage.deleteInt(_key); }
    function deleteBytes32(bytes32 _key) internal { rocketStorage.deleteBytes32(_key); }
    /// @dev Storage arithmetic methods
    function addUint(bytes32 _key, uint256 _amount) internal { rocketStorage.addUint(_key, _amount); }
    function subUint(bytes32 _key, uint256 _amount) internal { rocketStorage.subUint(_key, _amount); }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "./RocketBase.sol";
import "../interface/RocketVaultInterface.sol";
import "../interface/RocketVaultWithdrawerInterface.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
// ETH and rETH are stored here to prevent contract upgrades from affecting balances
// The RocketVault contract must not be upgraded
contract RocketVault is RocketBase, RocketVaultInterface {
    // Libs
    using SafeMath for uint;
    using SafeERC20 for IERC20;
    // Network contract balances
    mapping(string => uint256) etherBalances;
    mapping(bytes32 => uint256) tokenBalances;
    // Events
    event EtherDeposited(string indexed by, uint256 amount, uint256 time);
    event EtherWithdrawn(string indexed by, uint256 amount, uint256 time);
    event TokenDeposited(bytes32 indexed by, address indexed tokenAddress, uint256 amount, uint256 time);
    event TokenWithdrawn(bytes32 indexed by, address indexed tokenAddress, uint256 amount, uint256 time);
    event TokenBurned(bytes32 indexed by, address indexed tokenAddress, uint256 amount, uint256 time);
    event TokenTransfer(bytes32 indexed by, bytes32 indexed to, address indexed tokenAddress, uint256 amount, uint256 time);
\t// Construct
    constructor(RocketStorageInterface _rocketStorageAddress) RocketBase(_rocketStorageAddress) {
        version = 1;
    }
    // Get a contract's ETH balance by address
    function balanceOf(string memory _networkContractName) override external view returns (uint256) {
        // Return balance
        return etherBalances[_networkContractName];
    }
    // Get the balance of a token held by a network contract
    function balanceOfToken(string memory _networkContractName, IERC20 _tokenAddress) override external view returns (uint256) {
        // Return balance
        return tokenBalances[keccak256(abi.encodePacked(_networkContractName, _tokenAddress))];
    }
    // Accept an ETH deposit from a network contract
    // Only accepts calls from Rocket Pool network contracts
    function depositEther() override external payable onlyLatestNetworkContract {
        // Valid amount?
        require(msg.value > 0, "No valid amount of ETH given to deposit");
        // Get contract key
        string memory contractName = getContractName(msg.sender);
        // Update contract balance
        etherBalances[contractName] = etherBalances[contractName].add(msg.value);
        // Emit ether deposited event
        emit EtherDeposited(contractName, msg.value, block.timestamp);
    }
    // Withdraw an amount of ETH to a network contract
    // Only accepts calls from Rocket Pool network contracts
    function withdrawEther(uint256 _amount) override external onlyLatestNetworkContract {
        // Valid amount?
        require(_amount > 0, "No valid amount of ETH given to withdraw");
        // Get contract key
        string memory contractName = getContractName(msg.sender);
        // Check and update contract balance
        require(etherBalances[contractName] >= _amount, "Insufficient contract ETH balance");
        etherBalances[contractName] = etherBalances[contractName].sub(_amount);
        // Withdraw
        RocketVaultWithdrawerInterface withdrawer = RocketVaultWithdrawerInterface(msg.sender);
        withdrawer.receiveVaultWithdrawalETH{value: _amount}();
        // Emit ether withdrawn event
        emit EtherWithdrawn(contractName, _amount, block.timestamp);
    }
    // Accept an token deposit and assign its balance to a network contract (saves a large amount of gas this way through not needing a double token transfer via a network contract first)
    function depositToken(string memory _networkContractName, IERC20 _tokenContract, uint256 _amount) override external {
         // Valid amount?
        require(_amount > 0, "No valid amount of tokens given to deposit");
        // Make sure the network contract is valid (will throw if not)
        require(getContractAddress(_networkContractName) != address(0x0), "Not a valid network contract");
        // Get contract key
        bytes32 contractKey = keccak256(abi.encodePacked(_networkContractName, address(_tokenContract)));
        // Send the tokens to this contract now
        require(_tokenContract.transferFrom(msg.sender, address(this), _amount), "Token transfer was not successful");
        // Update contract balance
        tokenBalances[contractKey] = tokenBalances[contractKey].add(_amount);
        // Emit token transfer
        emit TokenDeposited(contractKey, address(_tokenContract), _amount, block.timestamp);
    }
    // Withdraw an amount of a ERC20 token to an address
    // Only accepts calls from Rocket Pool network contracts
    function withdrawToken(address _withdrawalAddress, IERC20 _tokenAddress, uint256 _amount) override external onlyLatestNetworkContract {
        // Valid amount?
        require(_amount > 0, "No valid amount of tokens given to withdraw");
        // Get contract key
        bytes32 contractKey = keccak256(abi.encodePacked(getContractName(msg.sender), _tokenAddress));
        // Update balances
        tokenBalances[contractKey] = tokenBalances[contractKey].sub(_amount);
        // Get the token ERC20 instance
        IERC20 tokenContract = IERC20(_tokenAddress);
        // Withdraw to the desired address
        require(tokenContract.transfer(_withdrawalAddress, _amount), "Rocket Vault token withdrawal unsuccessful");
        // Emit token withdrawn event
        emit TokenWithdrawn(contractKey, address(_tokenAddress), _amount, block.timestamp);
    }
    // Transfer token from one contract to another
    // Only accepts calls from Rocket Pool network contracts
    function transferToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) override external onlyLatestNetworkContract {
        // Valid amount?
        require(_amount > 0, "No valid amount of tokens given to transfer");
        // Make sure the network contract is valid (will throw if not)
        require(getContractAddress(_networkContractName) != address(0x0), "Not a valid network contract");
        // Get contract keys
        bytes32 contractKeyFrom = keccak256(abi.encodePacked(getContractName(msg.sender), _tokenAddress));
        bytes32 contractKeyTo = keccak256(abi.encodePacked(_networkContractName, _tokenAddress));
        // Update balances
        tokenBalances[contractKeyFrom] = tokenBalances[contractKeyFrom].sub(_amount);
        tokenBalances[contractKeyTo] = tokenBalances[contractKeyTo].add(_amount);
        // Emit token withdrawn event
        emit TokenTransfer(contractKeyFrom, contractKeyTo, address(_tokenAddress), _amount, block.timestamp);
    }
    // Burns an amount of a token that implements a burn(uint256) method
    // Only accepts calls from Rocket Pool network contracts
    function burnToken(ERC20Burnable _tokenAddress, uint256 _amount) override external onlyLatestNetworkContract {
        // Get contract key
        bytes32 contractKey = keccak256(abi.encodePacked(getContractName(msg.sender), _tokenAddress));
        // Update balances
        tokenBalances[contractKey] = tokenBalances[contractKey].sub(_amount);
        // Get the token ERC20 instance
        ERC20Burnable tokenContract = ERC20Burnable(_tokenAddress);
        // Burn the tokens
        tokenContract.burn(_amount);
        // Emit token burn event
        emit TokenBurned(contractKey, address(_tokenAddress), _amount, block.timestamp);
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// 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;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
interface RocketVaultInterface {
    function balanceOf(string memory _networkContractName) external view returns (uint256);
    function depositEther() external payable;
    function withdrawEther(uint256 _amount) external;
    function depositToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function withdrawToken(address _withdrawalAddress, IERC20 _tokenAddress, uint256 _amount) external;
    function balanceOfToken(string memory _networkContractName, IERC20 _tokenAddress) external view returns (uint256);
    function transferToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function burnToken(ERC20Burnable _tokenAddress, uint256 _amount) external;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketVaultWithdrawerInterface {
    function receiveVaultWithdrawalETH() external payable; 
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./ERC20.sol";
/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");
        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @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);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "../interface/RocketStorageInterface.sol";
/// @title Base settings / modifiers for each contract in Rocket Pool
/// @author David Rugendyke
abstract contract RocketBase {
    // Calculate using this as the base
    uint256 constant calcBase = 1 ether;
    // Version of the contract
    uint8 public version;
    // The main storage contract where primary persistant storage is maintained
    RocketStorageInterface rocketStorage = RocketStorageInterface(0);
    /*** Modifiers **********************************************************/
    /**
    * @dev Throws if called by any sender that doesn't match a Rocket Pool network contract
    */
    modifier onlyLatestNetworkContract() {
        require(getBool(keccak256(abi.encodePacked("contract.exists", msg.sender))), "Invalid or outdated network contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that doesn't match one of the supplied contract or is the latest version of that contract
    */
    modifier onlyLatestContract(string memory _contractName, address _contractAddress) {
        require(_contractAddress == getAddress(keccak256(abi.encodePacked("contract.address", _contractName))), "Invalid or outdated contract");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered node
    */
    modifier onlyRegisteredNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("node.exists", _nodeAddress))), "Invalid node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a trusted node DAO member
    */
    modifier onlyTrustedNode(address _nodeAddress) {
        require(getBool(keccak256(abi.encodePacked("dao.trustednodes.", "member", _nodeAddress))), "Invalid trusted node");
        _;
    }
    /**
    * @dev Throws if called by any sender that isn't a registered minipool
    */
    modifier onlyRegisteredMinipool(address _minipoolAddress) {
        require(getBool(keccak256(abi.encodePacked("minipool.exists", _minipoolAddress))), "Invalid minipool");
        _;
    }
    
    /**
    * @dev Throws if called by any account other than a guardian account (temporary account allowed access to settings before DAO is fully enabled)
    */
    modifier onlyGuardian() {
        require(msg.sender == rocketStorage.getGuardian(), "Account is not a temporary guardian");
        _;
    }
    /*** Methods **********************************************************/
    /// @dev Set the main Rocket Storage address
    constructor(RocketStorageInterface _rocketStorageAddress) {
        // Update the contract address
        rocketStorage = RocketStorageInterface(_rocketStorageAddress);
    }
    /// @dev Get the address of a network contract by name
    function getContractAddress(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Check it
        require(contractAddress != address(0x0), "Contract not found");
        // Return
        return contractAddress;
    }
    /// @dev Get the address of a network contract by name (returns address(0x0) instead of reverting if contract does not exist)
    function getContractAddressUnsafe(string memory _contractName) internal view returns (address) {
        // Get the current contract address
        address contractAddress = getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        // Return
        return contractAddress;
    }
    /// @dev Get the name of a network contract by address
    function getContractName(address _contractAddress) internal view returns (string memory) {
        // Get the contract name
        string memory contractName = getString(keccak256(abi.encodePacked("contract.name", _contractAddress)));
        // Check it
        require(bytes(contractName).length > 0, "Contract not found");
        // Return
        return contractName;
    }
    /// @dev Get revert error message from a .call method
    function getRevertMsg(bytes memory _returnData) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (_returnData.length < 68) return "Transaction reverted silently";
        assembly {
            // Slice the sighash.
            _returnData := add(_returnData, 0x04)
        }
        return abi.decode(_returnData, (string)); // All that remains is the revert string
    }
    /*** Rocket Storage Methods ****************************************/
    // Note: Unused helpers have been removed to keep contract sizes down
    /// @dev Storage get methods
    function getAddress(bytes32 _key) internal view returns (address) { return rocketStorage.getAddress(_key); }
    function getUint(bytes32 _key) internal view returns (uint) { return rocketStorage.getUint(_key); }
    function getString(bytes32 _key) internal view returns (string memory) { return rocketStorage.getString(_key); }
    function getBytes(bytes32 _key) internal view returns (bytes memory) { return rocketStorage.getBytes(_key); }
    function getBool(bytes32 _key) internal view returns (bool) { return rocketStorage.getBool(_key); }
    function getInt(bytes32 _key) internal view returns (int) { return rocketStorage.getInt(_key); }
    function getBytes32(bytes32 _key) internal view returns (bytes32) { return rocketStorage.getBytes32(_key); }
    /// @dev Storage set methods
    function setAddress(bytes32 _key, address _value) internal { rocketStorage.setAddress(_key, _value); }
    function setUint(bytes32 _key, uint _value) internal { rocketStorage.setUint(_key, _value); }
    function setString(bytes32 _key, string memory _value) internal { rocketStorage.setString(_key, _value); }
    function setBytes(bytes32 _key, bytes memory _value) internal { rocketStorage.setBytes(_key, _value); }
    function setBool(bytes32 _key, bool _value) internal { rocketStorage.setBool(_key, _value); }
    function setInt(bytes32 _key, int _value) internal { rocketStorage.setInt(_key, _value); }
    function setBytes32(bytes32 _key, bytes32 _value) internal { rocketStorage.setBytes32(_key, _value); }
    /// @dev Storage delete methods
    function deleteAddress(bytes32 _key) internal { rocketStorage.deleteAddress(_key); }
    function deleteUint(bytes32 _key) internal { rocketStorage.deleteUint(_key); }
    function deleteString(bytes32 _key) internal { rocketStorage.deleteString(_key); }
    function deleteBytes(bytes32 _key) internal { rocketStorage.deleteBytes(_key); }
    function deleteBool(bytes32 _key) internal { rocketStorage.deleteBool(_key); }
    function deleteInt(bytes32 _key) internal { rocketStorage.deleteInt(_key); }
    function deleteBytes32(bytes32 _key) internal { rocketStorage.deleteBytes32(_key); }
    /// @dev Storage arithmetic methods
    function addUint(bytes32 _key, uint256 _amount) internal { rocketStorage.addUint(_key, _amount); }
    function subUint(bytes32 _key, uint256 _amount) internal { rocketStorage.subUint(_key, _amount); }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../RocketBase.sol";
import "../../interface/dao/protocol/settings/RocketDAOProtocolSettingsInflationInterface.sol";
import "../../interface/token/RocketTokenRPLInterface.sol";
import "../../interface/RocketVaultInterface.sol";
// RPL Governance and utility token
// Inlfationary with rate determined by DAO
contract RocketTokenRPL is RocketBase, ERC20Burnable, RocketTokenRPLInterface {
    // Libs
    using SafeMath for uint;
    /**** Properties ***********/
    // How many RPL tokens minted to date (18m from fixed supply)
    uint256 constant totalInitialSupply = 18000000000000000000000000;
    // The RPL inflation interval
    uint256 constant inflationInterval = 1 days;
    // How many RPL tokens have been swapped for new ones
    uint256 public totalSwappedRPL = 0;
    // Timestamp of last block inflation was calculated at
    uint256 private inflationCalcTime = 0;
    /**** Contracts ************/
    // The address of our fixed supply RPL ERC20 token contract
    IERC20 rplFixedSupplyContract = IERC20(address(0));
    /**** Events ***********/
    event RPLInflationLog(address sender, uint256 value, uint256 inflationCalcTime);
    event RPLFixedSupplyBurn(address indexed from, uint256 amount, uint256 time);
    // Construct
    constructor(RocketStorageInterface _rocketStorageAddress, IERC20 _rocketTokenRPLFixedSupplyAddress) RocketBase(_rocketStorageAddress) ERC20("Rocket Pool Protocol", "RPL") {
        // Version
        version = 1;
        // Set the mainnet RPL fixed supply token address
        rplFixedSupplyContract = IERC20(_rocketTokenRPLFixedSupplyAddress);
        // Mint the 18m tokens that currently exist and allow them to be sent to people burning existing fixed supply RPL
        _mint(address(this), totalInitialSupply);
    }
    /**
    * Get the last time that inflation was calculated at
    * @return uint256 Last timestamp since inflation was calculated
    */
    function getInflationCalcTime() override public view returns(uint256) {
        // Get the last time inflation was calculated if it has even started
        uint256 inflationStartTime = getInflationIntervalStartTime();
        // If inflation has just begun but not been calculated previously, use the start block as the last calculated point if it has passed
        return inflationCalcTime == 0 && inflationStartTime < block.timestamp ? inflationStartTime : inflationCalcTime;
    }
    /**
    * How many seconds to calculate inflation at
    * @return uint256 how many seconds to calculate inflation at
    */
    function getInflationIntervalTime() override external pure returns(uint256) {
        return inflationInterval;
    }
    /**
    * The current inflation rate per interval (eg 1000133680617113500 = 5% annual)
    * @return uint256 The current inflation rate per interval
    */
    function getInflationIntervalRate() override public view returns(uint256) {
        // Inflation rate controlled by the DAO
        RocketDAOProtocolSettingsInflationInterface daoSettingsInflation = RocketDAOProtocolSettingsInflationInterface(getContractAddress("rocketDAOProtocolSettingsInflation"));
        return daoSettingsInflation.getInflationIntervalRate();
    }
    /**
    * The current block to begin inflation at
    * @return uint256 The current block to begin inflation at
    */
    function getInflationIntervalStartTime() override public view returns(uint256) {
        // Inflation rate start time controlled by the DAO
        RocketDAOProtocolSettingsInflationInterface daoSettingsInflation = RocketDAOProtocolSettingsInflationInterface(getContractAddress("rocketDAOProtocolSettingsInflation"));
        return daoSettingsInflation.getInflationIntervalStartTime();
    }
    /**
    * The current rewards pool address that receives the inflation
    * @return address The rewards pool contract address
    */
    function getInflationRewardsContractAddress() override external view returns(address) {
        // Inflation rate start block controlled by the DAO
        return getContractAddress("rocketRewardsPool");
    }
    /**
    * Compute interval since last inflation update (on call)
    * @return uint256 Time intervals since last update
    */
    function getInflationIntervalsPassed() override public view returns(uint256) {
        // The time that inflation was last calculated at
        uint256 inflationLastCalculatedTime = getInflationCalcTime();
        return _getInflationIntervalsPassed(inflationLastCalculatedTime);
    }
    function _getInflationIntervalsPassed(uint256 _inflationLastCalcTime) private view returns(uint256) {
        // Calculate now if inflation has begun
        if(_inflationLastCalcTime > 0) {
            return (block.timestamp).sub(_inflationLastCalcTime).div(inflationInterval);
        }else{
            return 0;
        }
    }
    /**
    * @dev Function to compute how many tokens should be minted
    * @return A uint256 specifying number of new tokens to mint
    */
    function inflationCalculate() override external view returns (uint256) {
        uint256 intervalsSinceLastMint = getInflationIntervalsPassed();
        return _inflationCalculate(intervalsSinceLastMint);
    }
    function _inflationCalculate(uint256 _intervalsSinceLastMint) private view returns (uint256) {
        // The inflation amount
        uint256 inflationTokenAmount = 0;
        // Only update  if last interval has passed and inflation rate is > 0
        if(_intervalsSinceLastMint > 0) {
            // Optimisation
            uint256 inflationRate = getInflationIntervalRate();
            if(inflationRate > 0) {
                // Get the total supply now
                uint256 totalSupplyCurrent = totalSupply();
                uint256 newTotalSupply = totalSupplyCurrent;
                // Compute inflation for total inflation intervals elapsed
                for (uint256 i = 0; i < _intervalsSinceLastMint; i++) {
                    newTotalSupply = newTotalSupply.mul(inflationRate).div(10**18);
                }
                // Return inflation amount
                inflationTokenAmount = newTotalSupply.sub(totalSupplyCurrent);
            }
        }
        // Done
        return inflationTokenAmount;
    }
    /**
    * @dev Mint new tokens if enough time has elapsed since last mint
    * @return A uint256 specifying number of new tokens that were minted
    */
    function inflationMintTokens() override external returns (uint256) {
        // Only run inflation process if at least 1 interval has passed (function returns 0 otherwise)
        uint256 inflationLastCalcTime = getInflationCalcTime();
        uint256 intervalsSinceLastMint = _getInflationIntervalsPassed(inflationLastCalcTime);
        if (intervalsSinceLastMint == 0) {
            return 0;
        }
        // Address of the vault where to send tokens
        address rocketVaultAddress = getContractAddress("rocketVault");
        require(rocketVaultAddress != address(0x0), "rocketVault address not set");
        // Only mint if we have new tokens to mint since last interval and an address is set to receive them
        RocketVaultInterface rocketVaultContract = RocketVaultInterface(rocketVaultAddress);
        // Calculate the amount of tokens now based on inflation rate
        uint256 newTokens = _inflationCalculate(intervalsSinceLastMint);
        // Update last inflation calculation timestamp even if inflation rate is 0
        inflationCalcTime = inflationLastCalcTime.add(inflationInterval.mul(intervalsSinceLastMint));
        // Check if actually need to mint tokens (e.g. inflation rate > 0)
        if (newTokens > 0) {
            // Mint to itself, then allocate tokens for transfer to rewards contract, this will update balance & supply
            _mint(address(this), newTokens);
            // Initialise itself and allow from it's own balance (cant just do an allow as it could be any user calling this so they are msg.sender)
            IERC20 rplInflationContract = IERC20(address(this));
            // Get the current allowance for Rocket Vault
            uint256 vaultAllowance = rplFixedSupplyContract.allowance(rocketVaultAddress, address(this));
            // Now allow Rocket Vault to move those tokens, we also need to account of any other allowances for this token from other contracts in the same block
            require(rplInflationContract.approve(rocketVaultAddress, vaultAllowance.add(newTokens)), "Allowance for Rocket Vault could not be approved");
            // Let vault know it can move these tokens to itself now and credit the balance to the RPL rewards pool contract
            rocketVaultContract.depositToken("rocketRewardsPool", IERC20(address(this)), newTokens);
        }
        // Log it
        emit RPLInflationLog(msg.sender, newTokens, inflationCalcTime);
        // return number minted
        return newTokens;
    }   
   /**
   * @dev Swap current RPL fixed supply tokens for new RPL 1:1 to the same address from the user calling it
   * @param _amount The amount of RPL fixed supply tokens to swap
   */
    function swapTokens(uint256 _amount) override external {
        // Valid amount?
        require(_amount > 0, "Please enter valid amount of RPL to swap");
        // Send the tokens to this contract now and mint new ones for them
        require(rplFixedSupplyContract.transferFrom(msg.sender, address(this), _amount), "Token transfer from existing RPL contract was not successful");
        // Transfer from the contracts RPL balance to the user
        require(this.transfer(msg.sender, _amount), "Token transfer from RPL inflation contract was not successful");
        // Update the total swapped
        totalSwappedRPL = totalSwappedRPL.add(_amount);
        // Log it
        emit RPLFixedSupplyBurn(msg.sender, _amount, block.timestamp);
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// 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;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
interface RocketVaultInterface {
    function balanceOf(string memory _networkContractName) external view returns (uint256);
    function depositEther() external payable;
    function withdrawEther(uint256 _amount) external;
    function depositToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function withdrawToken(address _withdrawalAddress, IERC20 _tokenAddress, uint256 _amount) external;
    function balanceOfToken(string memory _networkContractName, IERC20 _tokenAddress) external view returns (uint256);
    function transferToken(string memory _networkContractName, IERC20 _tokenAddress, uint256 _amount) external;
    function burnToken(ERC20Burnable _tokenAddress, uint256 _amount) external;
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
interface RocketDAOProtocolSettingsInflationInterface {
    function getInflationIntervalRate() external view returns (uint256);
    function getInflationIntervalStartTime() external view returns (uint256);
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface RocketTokenRPLInterface is IERC20 {
    function getInflationCalcTime() external view returns(uint256);
    function getInflationIntervalTime() external view returns(uint256);
    function getInflationIntervalRate() external view returns(uint256);
    function getInflationIntervalsPassed() external view returns(uint256);
    function getInflationIntervalStartTime() external view returns(uint256);
    function getInflationRewardsContractAddress() external view returns(address);
    function inflationCalculate() external view returns (uint256);
    function inflationMintTokens() external returns (uint256);
    function swapTokens(uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// SPDX-License-Identifier: GPL-3.0-only
import "../interface/RocketStorageInterface.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
/// @title The primary persistent storage for Rocket Pool
/// @author David Rugendyke
contract RocketStorage is RocketStorageInterface {
    // Events
    event NodeWithdrawalAddressSet(address indexed node, address indexed withdrawalAddress, uint256 time);
    event GuardianChanged(address oldGuardian, address newGuardian);
    // Libraries
    using SafeMath for uint256;
    // Storage maps
    mapping(bytes32 => string)     private stringStorage;
    mapping(bytes32 => bytes)      private bytesStorage;
    mapping(bytes32 => uint256)    private uintStorage;
    mapping(bytes32 => int256)     private intStorage;
    mapping(bytes32 => address)    private addressStorage;
    mapping(bytes32 => bool)       private booleanStorage;
    mapping(bytes32 => bytes32)    private bytes32Storage;
    // Protected storage (not accessible by network contracts)
    mapping(address => address)    private withdrawalAddresses;
    mapping(address => address)    private pendingWithdrawalAddresses;
    // Guardian address
    address guardian;
    address newGuardian;
    // Flag storage has been initialised
    bool storageInit = false;
    /// @dev Only allow access from the latest version of a contract in the Rocket Pool network after deployment
    modifier onlyLatestRocketNetworkContract() {
        if (storageInit == true) {
            // Make sure the access is permitted to only contracts in our Dapp
            require(booleanStorage[keccak256(abi.encodePacked("contract.exists", msg.sender))], "Invalid or outdated network contract");
        } else {
            // Only Dapp and the guardian account are allowed access during initialisation.
            // tx.origin is only safe to use in this case for deployment since no external contracts are interacted with
            require((
                booleanStorage[keccak256(abi.encodePacked("contract.exists", msg.sender))] || tx.origin == guardian
            ), "Invalid or outdated network contract attempting access during deployment");
        }
        _;
    }
    /// @dev Construct RocketStorage
    constructor() {
        // Set the guardian upon deployment
        guardian = msg.sender;
    }
    // Get guardian address
    function getGuardian() external override view returns (address) {
        return guardian;
    }
    // Transfers guardianship to a new address
    function setGuardian(address _newAddress) external override {
        // Check tx comes from current guardian
        require(msg.sender == guardian, "Is not guardian account");
        // Store new address awaiting confirmation
        newGuardian = _newAddress;
    }
    // Confirms change of guardian
    function confirmGuardian() external override {
        // Check tx came from new guardian address
        require(msg.sender == newGuardian, "Confirmation must come from new guardian address");
        // Store old guardian for event
        address oldGuardian = guardian;
        // Update guardian and clear storage
        guardian = newGuardian;
        delete newGuardian;
        // Emit event
        emit GuardianChanged(oldGuardian, guardian);
    }
    // Set this as being deployed now
    function getDeployedStatus() external override view returns (bool) {
        return storageInit;
    }
    // Set this as being deployed now
    function setDeployedStatus() external {
        // Only guardian can lock this down
        require(msg.sender == guardian, "Is not guardian account");
        // Set it now
        storageInit = true;
    }
    // Protected storage
    // Get a node's withdrawal address
    function getNodeWithdrawalAddress(address _nodeAddress) public override view returns (address) {
        // If no withdrawal address has been set, return the nodes address
        address withdrawalAddress = withdrawalAddresses[_nodeAddress];
        if (withdrawalAddress == address(0)) {
            return _nodeAddress;
        }
        return withdrawalAddress;
    }
    // Get a node's pending withdrawal address
    function getNodePendingWithdrawalAddress(address _nodeAddress) external override view returns (address) {
        return pendingWithdrawalAddresses[_nodeAddress];
    }
    // Set a node's withdrawal address
    function setWithdrawalAddress(address _nodeAddress, address _newWithdrawalAddress, bool _confirm) external override {
        // Check new withdrawal address
        require(_newWithdrawalAddress != address(0x0), "Invalid withdrawal address");
        // Confirm the transaction is from the node's current withdrawal address
        address withdrawalAddress = getNodeWithdrawalAddress(_nodeAddress);
        require(withdrawalAddress == msg.sender, "Only a tx from a node's withdrawal address can update it");
        // Update immediately if confirmed
        if (_confirm) {
            updateWithdrawalAddress(_nodeAddress, _newWithdrawalAddress);
        }
        // Set pending withdrawal address if not confirmed
        else {
            pendingWithdrawalAddresses[_nodeAddress] = _newWithdrawalAddress;
        }
    }
    // Confirm a node's new withdrawal address
    function confirmWithdrawalAddress(address _nodeAddress) external override {
        // Get node by pending withdrawal address
        require(pendingWithdrawalAddresses[_nodeAddress] == msg.sender, "Confirmation must come from the pending withdrawal address");
        delete pendingWithdrawalAddresses[_nodeAddress];
        // Update withdrawal address
        updateWithdrawalAddress(_nodeAddress, msg.sender);
    }
    // Update a node's withdrawal address
    function updateWithdrawalAddress(address _nodeAddress, address _newWithdrawalAddress) private {
        // Set new withdrawal address
        withdrawalAddresses[_nodeAddress] = _newWithdrawalAddress;
        // Emit withdrawal address set event
        emit NodeWithdrawalAddressSet(_nodeAddress, _newWithdrawalAddress, block.timestamp);
    }
    /// @param _key The key for the record
    function getAddress(bytes32 _key) override external view returns (address r) {
        return addressStorage[_key];
    }
    /// @param _key The key for the record
    function getUint(bytes32 _key) override external view returns (uint256 r) {
        return uintStorage[_key];
    }
    /// @param _key The key for the record
    function getString(bytes32 _key) override external view returns (string memory) {
        return stringStorage[_key];
    }
    /// @param _key The key for the record
    function getBytes(bytes32 _key) override external view returns (bytes memory) {
        return bytesStorage[_key];
    }
    /// @param _key The key for the record
    function getBool(bytes32 _key) override external view returns (bool r) {
        return booleanStorage[_key];
    }
    /// @param _key The key for the record
    function getInt(bytes32 _key) override external view returns (int r) {
        return intStorage[_key];
    }
    /// @param _key The key for the record
    function getBytes32(bytes32 _key) override external view returns (bytes32 r) {
        return bytes32Storage[_key];
    }
    /// @param _key The key for the record
    function setAddress(bytes32 _key, address _value) onlyLatestRocketNetworkContract override external {
        addressStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setUint(bytes32 _key, uint _value) onlyLatestRocketNetworkContract override external {
        uintStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setString(bytes32 _key, string calldata _value) onlyLatestRocketNetworkContract override external {
        stringStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setBytes(bytes32 _key, bytes calldata _value) onlyLatestRocketNetworkContract override external {
        bytesStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setBool(bytes32 _key, bool _value) onlyLatestRocketNetworkContract override external {
        booleanStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setInt(bytes32 _key, int _value) onlyLatestRocketNetworkContract override external {
        intStorage[_key] = _value;
    }
    /// @param _key The key for the record
    function setBytes32(bytes32 _key, bytes32 _value) onlyLatestRocketNetworkContract override external {
        bytes32Storage[_key] = _value;
    }
    /// @param _key The key for the record
    function deleteAddress(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete addressStorage[_key];
    }
    /// @param _key The key for the record
    function deleteUint(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete uintStorage[_key];
    }
    /// @param _key The key for the record
    function deleteString(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete stringStorage[_key];
    }
    /// @param _key The key for the record
    function deleteBytes(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete bytesStorage[_key];
    }
    /// @param _key The key for the record
    function deleteBool(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete booleanStorage[_key];
    }
    /// @param _key The key for the record
    function deleteInt(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete intStorage[_key];
    }
    /// @param _key The key for the record
    function deleteBytes32(bytes32 _key) onlyLatestRocketNetworkContract override external {
        delete bytes32Storage[_key];
    }
    /// @param _key The key for the record
    /// @param _amount An amount to add to the record's value
    function addUint(bytes32 _key, uint256 _amount) onlyLatestRocketNetworkContract override external {
        uintStorage[_key] = uintStorage[_key].add(_amount);
    }
    /// @param _key The key for the record
    /// @param _amount An amount to subtract from the record's value
    function subUint(bytes32 _key, uint256 _amount) onlyLatestRocketNetworkContract override external {
        uintStorage[_key] = uintStorage[_key].sub(_amount);
    }
}
/**
  *       .
  *      / \\
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \\|        | |      | |    | ___ \\         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \\ / __| |/ / _ \\ __|  |  __/ _ \\ / _ \\| |
  *  | |\\ \\ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \\_| \\_\\___/ \\___|_|\\_\\___|\\__|  \\_|  \\___/ \\___/|_|
  * +---------------------------------------------------+
  * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
  *  be community-owned, decentralised, and trustless.
  *
  *  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 0.7.6;
// 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;
}