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Outline

• library Address
•    - function isContract(address account)
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(
• interface IStakingRewards
•    - function balanceOf(address account)
•    - function earned(address account)
•    - function getRewardForDuration()
•    - function lastTimeRewardApplicable()
•    - function rewardPerToken()
•    - function rewardsDistribution()
•    - function rewardsToken()
•    - function totalSupply()
•    - function exit()
•    - function getReward()
•    - function stake(uint256 amount)
•    - function withdraw(uint256 amount)
•  contract Owned
•    - function nominateNewOwner(address _ow ...
•    - function acceptOwnership()
•    - function _onlyOwner()
•  contract ReentrancyGuard
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
•  contract ERC20Detailed is IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•  contract Pausable is Owned
•    - function setPaused(bool _paused)
•  contract RewardsDistributionRecipi ...
•    - function notifyRewardAmount(uint256 r ...
•    - function setRewardsDistribution(addre ...
• library SafeERC20
•    - function safeTransfer(
•    - function safeTransferFrom(
•    - function safeApprove(
•    - function safeIncreaseAllowance(
•    - function safeDecreaseAllowance(
•    - function callOptionalReturn(IERC20 to ...
•  contract StakingRewards is *
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function lastTimeRewardApplicable()
•    - function rewardPerToken()
•    - function earned(address account)
•    - function getRewardForDuration()
•    - function stake(uint256 amount)
•    - function stakeFor(address recipient, ...
•    - function withdraw(uint256 amount)
•    - function getReward()
•    - function exit()
•    - function notifyRewardAmount(uint256 r ...
•    - function recoverERC20(address tokenAd ...
•    - function setRewardsDuration(uint256 _ ...
•    - function setZapContract(address _zapC ...

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/**
 *Submitted for verification at optimistic.etherscan.io on 2023-04-03
*/

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.5.16;

// File: Address.sol

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in 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;
    }
}

// File: IERC20.sol

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
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.
     *
     * > 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
    );
}

// File: IStakingRewards.sol

// https://docs.synthetix.io/contracts/source/interfaces/istakingrewards
interface IStakingRewards {
    // Views

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

    function earned(address account) external view returns (uint256);

    function getRewardForDuration() external view returns (uint256);

    function lastTimeRewardApplicable() external view returns (uint256);

    function rewardPerToken() external view returns (uint256);

    function rewardsDistribution() external view returns (address);

    function rewardsToken() external view returns (address);

    function totalSupply() external view returns (uint256);

    // Mutative

    function exit() external;

    function getReward() external;

    function stake(uint256 amount) external;

    function withdraw(uint256 amount) external;
}

// File: Owned.sol

// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(
            msg.sender == nominatedOwner,
            "You must be nominated before you can accept ownership"
        );
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(
            msg.sender == owner,
            "Only the contract owner may perform this action"
        );
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}

// File: ReentrancyGuard.sol

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor() internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(
            localCounter == _guardCounter,
            "ReentrancyGuard: reentrant call"
        );
    }
}

// File: SafeMath.sol

/**
 * @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, 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");
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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-solidity/pull/522
        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. Reverts 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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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;
    }
}

// File: ERC20Detailed.sol

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor(
        string memory name,
        string memory symbol,
        uint8 decimals
    ) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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.
     *
     * > Note that 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 returns (uint8) {
        return _decimals;
    }
}

// File: Pausable.sol

// Inheritance

// https://docs.synthetix.io/contracts/source/contracts/pausable
contract Pausable is Owned {
    uint256 public lastPauseTime;
    bool public paused;

    constructor() internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");
        // Paused will be false, and lastPauseTime will be 0 upon initialisation
    }

    /**
     * @notice Change the paused state of the contract
     * @dev Only the contract owner may call this.
     */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        if (_paused == paused) {
            return;
        }

        // Set our paused state.
        paused = _paused;

        // If applicable, set the last pause time.
        if (paused) {
            lastPauseTime = now;
        }

        // Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

    event PauseChanged(bool isPaused);

    modifier notPaused {
        require(
            !paused,
            "This action cannot be performed while the contract is paused"
        );
        _;
    }
}

// File: RewardsDistributionRecipient.sol

// Inheritance

// https://docs.synthetix.io/contracts/source/contracts/rewardsdistributionrecipient
contract RewardsDistributionRecipient is Owned {
    address public rewardsDistribution;

    function notifyRewardAmount(uint256 reward) external;

    modifier onlyRewardsDistribution() {
        require(
            msg.sender == rewardsDistribution,
            "Caller is not RewardsDistribution contract"
        );
        _;
    }

    function setRewardsDistribution(address _rewardsDistribution)
        external
        onlyOwner
    {
        rewardsDistribution = _rewardsDistribution;
    }
}

// File: SafeERC20.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 ERC20;` 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)
        );
    }

    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);
        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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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"
            );
        }
    }
}

// File: StakingRewards.sol

// Inheritance

// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
contract StakingRewards is
    IStakingRewards,
    RewardsDistributionRecipient,
    ReentrancyGuard,
    Pausable
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    /// @notice The address of our rewards token.
    IERC20 public rewardsToken;

    /// @notice The address of our staking token.
    IERC20 public stakingToken;

    /// @notice The end (timestamp) of our current or most recent reward period.
    uint256 public periodFinish = 0;

    /// @notice The distribution rate of rewardsToken per second.
    uint256 public rewardRate = 0;

    /// @notice The duration of our rewards distribution for staking, default is 7 days.
    uint256 public rewardsDuration = 7 days;

    /// @notice The last time rewards were updated, triggered by updateReward() or notifyRewardAmount().
    /// @dev Will be the timestamp of the update or the end of the period, whichever is earlier.
    uint256 public lastUpdateTime;

    /// @notice The most recent stored amount for rewardPerToken().
    /// @dev Updated every time anyone calls the updateReward() modifier.
    uint256 public rewardPerTokenStored;

    /// @notice The address of our zap contract, allows depositing to vault and staking in one transaction.
    address public zapContract;

    /// @notice Bool for if this staking contract is shut down and rewards have been swept out.
    /// @dev Can only be performed at least 90 days after final reward period ends.
    bool public isRetired;

    /// @notice The amount of rewards allocated to a user per whole token staked.
    /// @dev Note that this is not the same as amount of rewards claimed.
    mapping(address => uint256) public userRewardPerTokenPaid;

    /// @notice The amount of unclaimed rewards an account is owed.
    mapping(address => uint256) public rewards;

    // private vars, use view functions to see these
    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _owner,
        address _rewardsDistribution,
        address _rewardsToken,
        address _stakingToken,
        address _zapContract
    ) public Owned(_owner) {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
        rewardsDistribution = _rewardsDistribution;
        zapContract = _zapContract;
    }

    /* ========== VIEWS ========== */

    /// @notice The total tokens staked in this contract.
    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    /// @notice The balance a given user has staked.
    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    /// @notice Either the current timestamp or end of the most recent period.
    function lastTimeRewardApplicable() public view returns (uint256) {
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    /// @notice Reward paid out per whole token.
    function rewardPerToken() public view returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }

        if (isRetired) {
            return 0;
        }

        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(_totalSupply)
            );
    }

    /// @notice Amount of reward token pending claim by an account.
    function earned(address account) public view returns (uint256) {
        if (isRetired) {
            return 0;
        }

        return
            _balances[account]
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    /// @notice Reward tokens emitted over the entire rewardsDuration.
    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    /// @notice Deposit vault tokens to the staking pool.
    /// @dev Can't stake zero.
    /// @param amount Amount of vault tokens to deposit.
    function stake(uint256 amount)
        external
        nonReentrant
        notPaused
        updateReward(msg.sender)
    {
        require(amount > 0, "Cannot stake 0");
        require(!isRetired, "Staking pool is retired");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    /// @notice Deposit vault tokens for specified recipient.
    /// @dev Can't stake zero, can only be used by zap contract.
    /// @param recipient Address of user these vault tokens are being staked for.
    /// @param amount Amount of vault token to deposit.
    function stakeFor(address recipient, uint256 amount)
        external
        nonReentrant
        notPaused
        updateReward(recipient)
    {
        require(msg.sender == zapContract, "Only zap contract");
        require(amount > 0, "Cannot stake 0");
        require(!isRetired, "Staking pool is retired");
        _totalSupply = _totalSupply.add(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit StakedFor(recipient, amount);
    }

    /// @notice Withdraw vault tokens from the staking pool.
    /// @dev Can't withdraw zero. If trying to claim, call getReward() instead.
    /// @param amount Amount of vault tokens to withdraw.
    function withdraw(uint256 amount)
        public
        nonReentrant
        updateReward(msg.sender)
    {
        require(amount > 0, "Cannot withdraw 0");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

    /// @notice Claim any earned reward tokens.
    /// @dev Can claim rewards even if no tokens still staked.
    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    /// @notice Unstake all of the sender's tokens and claim any outstanding rewards.
    function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    /// @notice Notify staking contract that it has more reward to account for.
    /// @dev Reward tokens must be sent to contract before notifying. May only be called
    ///  by rewards distribution role.
    /// @param reward Amount of reward tokens to add.
    function notifyRewardAmount(uint256 reward)
        external
        onlyRewardsDistribution
        updateReward(address(0))
    {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardsToken.balanceOf(address(this));
        require(
            rewardRate <= balance.div(rewardsDuration),
            "Provided reward too high"
        );

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

    /// @notice Sweep out tokens accidentally sent here.
    /// @dev May only be called by owner.
    /// @param tokenAddress Address of token to sweep.
    /// @param tokenAmount Amount of tokens to sweep.
    function recoverERC20(address tokenAddress, uint256 tokenAmount)
        external
        onlyOwner
    {
        require(
            tokenAddress != address(stakingToken),
            "Cannot withdraw the staking token"
        );

        // can only recover rewardsToken 90 days after end
        if (tokenAddress == address(rewardsToken)) {
            require(
                block.timestamp > periodFinish + 90 days,
                "wait 90 days to sweep leftover rewards"
            );

            // if we do this, automatically sweep all rewardsToken
            tokenAmount = rewardsToken.balanceOf(address(this));

            // retire this staking contract, this wipes all rewards but still allows all users to withdraw
            isRetired = true;
        }

        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    /// @notice Set the duration of our rewards period.
    /// @dev May only be called by owner, and must be done after most recent period ends.
    /// @param _rewardsDuration New length of period in seconds.
    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

    /// @notice Set our zap contract.
    /// @dev May only be called by owner, and can't be set to zero address.
    /// @param _zapContract Address of the new zap contract.
    function setZapContract(address _zapContract) external onlyOwner {
        require(_zapContract != address(0), "no zero address");
        zapContract = _zapContract;
        emit ZapContractUpdated(_zapContract);
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event StakedFor(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event ZapContractUpdated(address _zapContract);
    event Recovered(address token, uint256 amount);
}

• No Contract Security Audit Submitted- Submit Audit Here

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