Contract 0x6e56a5d49f775ba08041e28030bc7826b13489e0 17

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "./utils/Owned.sol";
import "./interfaces/IStakingRewards.sol";
import "./interfaces/ISupplySchedule.sol";
import "./interfaces/IRewardEscrow.sol";

/// @title KWENTA Staking Rewards
/// @author SYNTHETIX, JaredBorders ([email protected]), JChiaramonte7 ([email protected])
/// @notice Updated version of Synthetix's StakingRewards with new features specific
/// to Kwenta
contract StakingRewards is IStakingRewards, Owned, ReentrancyGuard, Pausable {
    using SafeERC20 for IERC20;

    /*///////////////////////////////////////////////////////////////
                                CONSTANTS
    ///////////////////////////////////////////////////////////////*/

    /// @notice token used for BOTH staking and rewards
    IERC20 public immutable token;

    /// @notice escrow contract which holds (and may stake) reward tokens
    IRewardEscrow public immutable rewardEscrow;

    /// @notice handles reward token minting logic
    ISupplySchedule public immutable supplySchedule;

    /*///////////////////////////////////////////////////////////////
                                STATE
    ///////////////////////////////////////////////////////////////*/

    /// @notice number of tokens staked by address
    /// @dev this includes escrowed tokens stake
    mapping(address => uint256) private balances;

    /// @notice number of staked escrow tokens by address
    mapping(address => uint256) private escrowedBalances;

    /// @notice total number of tokens staked in this contract
    uint256 private _totalSupply;

    /// @notice marks applicable reward period finish time
    uint256 public periodFinish = 0;

    /// @notice amount of tokens minted per second
    uint256 public rewardRate = 0;

    /// @notice period for rewards
    uint256 public rewardsDuration = 7 days;

    /// @notice track last time the rewards were updated
    uint256 public lastUpdateTime;

    /// @notice summation of rewardRate divided by total staked tokens
    uint256 public rewardPerTokenStored;

    /// @notice represents the rewardPerToken
    /// value the last time the stake calculated earned() rewards
    mapping(address => uint256) public userRewardPerTokenPaid;

    /// @notice track rewards for a given user which changes when
    /// a user stakes, unstakes, or claims rewards
    mapping(address => uint256) public rewards;

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

    /// @notice update reward rate
    /// @param reward: amount to be distributed over applicable rewards duration
    event RewardAdded(uint256 reward);

    /// @notice emitted when user stakes tokens
    /// @param user: staker address
    /// @param amount: amount staked
    event Staked(address indexed user, uint256 amount);

    /// @notice emitted when user unstakes tokens
    /// @param user: address of user unstaking
    /// @param amount: amount unstaked
    event Unstaked(address indexed user, uint256 amount);

    /// @notice emitted when escrow staked
    /// @param user: owner of escrowed tokens address
    /// @param amount: amount staked
    event EscrowStaked(address indexed user, uint256 amount);

    /// @notice emitted when staked escrow tokens are unstaked
    /// @param user: owner of escrowed tokens address
    /// @param amount: amount unstaked
    event EscrowUnstaked(address user, uint256 amount);

    /// @notice emitted when user claims rewards
    /// @param user: address of user claiming rewards
    /// @param reward: amount of reward token claimed
    event RewardPaid(address indexed user, uint256 reward);

    /// @notice emitted when rewards duration changes
    /// @param newDuration: denoted in seconds
    event RewardsDurationUpdated(uint256 newDuration);

    /// @notice emitted when tokens are recovered from this contract
    /// @param token: address of token recovered
    /// @param amount: amount of token recovered
    event Recovered(address token, uint256 amount);

    /*///////////////////////////////////////////////////////////////
                                AUTH
    ///////////////////////////////////////////////////////////////*/

    /// @notice access control modifier for rewardEscrow
    modifier onlyRewardEscrow() {
        require(
            msg.sender == address(rewardEscrow),
            "StakingRewards: Only Reward Escrow"
        );
        _;
    }

    /// @notice access control modifier for rewardEscrow
    modifier onlySupplySchedule() {
        require(
            msg.sender == address(supplySchedule),
            "StakingRewards: Only Supply Schedule"
        );
        _;
    }

    /*///////////////////////////////////////////////////////////////
                            CONSTRUCTOR
    ///////////////////////////////////////////////////////////////*/

    /// @notice configure StakingRewards state
    /// @dev owner set to address that deployed StakingRewards
    /// @param _token: token used for staking and for rewards
    /// @param _rewardEscrow: escrow contract which holds (and may stake) reward tokens
    /// @param _supplySchedule: handles reward token minting logic
    constructor(
        address _token,
        address _rewardEscrow,
        address _supplySchedule
    ) Owned(msg.sender) {
        // define reward/staking token
        token = IERC20(_token);

        // define contracts which will interact with StakingRewards
        rewardEscrow = IRewardEscrow(_rewardEscrow);
        supplySchedule = ISupplySchedule(_supplySchedule);
    }

    /*///////////////////////////////////////////////////////////////
                                VIEWS
    ///////////////////////////////////////////////////////////////*/

    /// @dev returns staked tokens which will likely not be equal to total tokens
    /// in the contract since reward and staking tokens are the same
    /// @return total amount of tokens that are being staked
    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    /// @param account: address of potential staker
    /// @return amount of tokens staked by account
    function balanceOf(address account)
        external
        view
        override
        returns (uint256)
    {
        return balances[account];
    }

    /// @notice Getter function for number of staked escrow tokens
    /// @param account address to check the escrowed tokens staked
    /// @return amount of escrowed tokens staked
    function escrowedBalanceOf(address account)
        external
        view
        override
        returns (uint256)
    {
        return escrowedBalances[account];
    }

    /// @return rewards for the duration specified by rewardsDuration
    function getRewardForDuration() external view override returns (uint256) {
        return rewardRate * rewardsDuration;
    }

    /// @notice Getter function for number of staked non-escrow tokens
    /// @param account address to check the non-escrowed tokens staked
    /// @return amount of non-escrowed tokens staked
    function nonEscrowedBalanceOf(address account)
        public
        view
        override
        returns (uint256)
    {
        return balances[account] - escrowedBalances[account];
    }

    /*///////////////////////////////////////////////////////////////
                            STAKE/UNSTAKE
    ///////////////////////////////////////////////////////////////*/

    /// @notice stake token
    /// @param amount: amount to stake
    /// @dev updateReward() called prior to function logic
    function stake(uint256 amount)
        external
        override
        nonReentrant
        whenNotPaused
        updateReward(msg.sender)
    {
        require(amount > 0, "StakingRewards: Cannot stake 0");

        // update state
        _totalSupply += amount;
        balances[msg.sender] += amount;

        // transfer token to this contract from the caller
        token.safeTransferFrom(msg.sender, address(this), amount);

        // emit staking event and index msg.sender
        emit Staked(msg.sender, amount);
    }

    /// @notice unstake token
    /// @param amount: amount to unstake
    /// @dev updateReward() called prior to function logic
    function unstake(uint256 amount)
        public
        override
        nonReentrant
        updateReward(msg.sender)
    {
        require(amount > 0, "StakingRewards: Cannot Unstake 0");
        require(
            amount <= nonEscrowedBalanceOf(msg.sender),
            "StakingRewards: Invalid Amount"
        );

        // update state
        _totalSupply -= amount;
        balances[msg.sender] -= amount;

        // transfer token from this contract to the caller
        token.safeTransfer(msg.sender, amount);

        // emit unstake event and index msg.sender
        emit Unstaked(msg.sender, amount);
    }

    /// @notice stake escrowed token
    /// @param account: address which owns token
    /// @param amount: amount to stake
    /// @dev updateReward() called prior to function logic
    /// @dev msg.sender NOT used (account is used)
    function stakeEscrow(address account, uint256 amount)
        external
        override
        whenNotPaused
        onlyRewardEscrow
        updateReward(account)
    {
        require(amount > 0, "StakingRewards: Cannot stake 0");

        // update state
        balances[account] += amount;
        escrowedBalances[account] += amount;

        // updates total supply despite no new staking token being transfered.
        // escrowed tokens are locked in RewardEscrow
        _totalSupply += amount;

        // emit escrow staking event and index _account
        emit EscrowStaked(account, amount);
    }

    /// @notice unstake escrowed token
    /// @param account: address which owns token
    /// @param amount: amount to unstake
    /// @dev updateReward() called prior to function logic
    /// @dev msg.sender NOT used (account is used)
    function unstakeEscrow(address account, uint256 amount)
        external
        override
        nonReentrant
        onlyRewardEscrow
        updateReward(account)
    {
        require(amount > 0, "StakingRewards: Cannot Unstake 0");
        require(
            escrowedBalances[account] >= amount,
            "StakingRewards: Invalid Amount"
        );

        // update state
        balances[account] -= amount;
        escrowedBalances[account] -= amount;

        // updates total supply despite no new staking token being transfered.
        // escrowed tokens are locked in RewardEscrow
        _totalSupply -= amount;

        // emit escrow unstaked event and index account
        emit EscrowUnstaked(account, amount);
    }

    /// @notice unstake all available staked non-escrowed tokens and
    /// claim any rewards
    function exit() external override {
        unstake(nonEscrowedBalanceOf(msg.sender));
        getReward();
    }    

    /*///////////////////////////////////////////////////////////////
                            CLAIM REWARDS
    ///////////////////////////////////////////////////////////////*/

    /// @notice caller claims any rewards generated from staking
    /// @dev rewards are escrowed in RewardEscrow
    /// @dev updateReward() called prior to function logic
    function getReward() public override nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            // update state (first)
            rewards[msg.sender] = 0;

            // transfer token from this contract to the rewardEscrow
            // and create a vesting entry for the caller
            token.safeTransfer(address(rewardEscrow), reward);
            rewardEscrow.appendVestingEntry(msg.sender, reward, 52 weeks);

            // emit reward claimed event and index msg.sender
            emit RewardPaid(msg.sender, reward);
        }
    }

    /*///////////////////////////////////////////////////////////////
                        REWARD UPDATE CALCULATIONS
    ///////////////////////////////////////////////////////////////*/

    /// @notice update reward state for the account and contract
    /// @param account: address of account which rewards are being updated for
    /// @dev contract state not specific to an account will be updated also
    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();

        if (account != address(0)) {
            // update amount of rewards a user can claim
            rewards[account] = earned(account);

            // update reward per token staked AT this given time
            // (i.e. when this user is interacting with StakingRewards)
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    /// @notice calculate running sum of reward per total tokens staked
    /// at this specific time
    /// @return running sum of reward per total tokens staked
    function rewardPerToken() public view override returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }

        return
            rewardPerTokenStored +
            (((lastTimeRewardApplicable() - lastUpdateTime) *
                rewardRate *
                1e18) / (_totalSupply));
    }

    /// @return timestamp of the last time rewards are applicable
    function lastTimeRewardApplicable() public view override returns (uint256) {
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    /// @notice determine how much reward token an account has earned thus far
    /// @param account: address of account earned amount is being calculated for
    function earned(address account) public view override returns (uint256) {
        return
            ((balances[account] *
                (rewardPerToken() - userRewardPerTokenPaid[account])) / 1e18) +
            rewards[account];
    }

    /*///////////////////////////////////////////////////////////////
                            SETTINGS
    ///////////////////////////////////////////////////////////////*/

    /// @notice configure reward rate
    /// @param reward: amount of token to be distributed over a period
    /// @dev updateReward() called prior to function logic (with zero address)
    function notifyRewardAmount(uint256 reward)
        external
        override
        onlySupplySchedule
        updateReward(address(0))
    {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward / rewardsDuration;
        } else {
            uint256 remaining = periodFinish - block.timestamp;
            uint256 leftover = remaining * rewardRate;
            rewardRate = (reward + leftover) / rewardsDuration;
        }

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

    /// @notice set rewards duration
    /// @param _rewardsDuration: denoted in seconds
    function setRewardsDuration(uint256 _rewardsDuration)
        external
        override
        onlyOwner
    {
        require(
            block.timestamp > periodFinish,
            "StakingRewards: Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

    /*///////////////////////////////////////////////////////////////
                            PAUSABLE
    ///////////////////////////////////////////////////////////////*/

    /// @dev Triggers stopped state
    function pauseStakingRewards() external override onlyOwner {
        Pausable._pause();
    }

    /// @dev Returns to normal state.
    function unpauseStakingRewards() external override onlyOwner {
        Pausable._unpause();
    }

    /*///////////////////////////////////////////////////////////////
                            MISCELLANEOUS
    ///////////////////////////////////////////////////////////////*/

    /// @notice added to support recovering LP Rewards from other systems
    /// such as BAL to be distributed to holders
    /// @param tokenAddress: address of token to be recovered
    /// @param tokenAmount: amount of token to be recovered
    function recoverERC20(address tokenAddress, uint256 tokenAmount)
        external
        override
        onlyOwner
    {
        require(
            tokenAddress != address(token),
            "StakingRewards: Cannot unstake the staking token"
        );
        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

    constructor(address _owner) {
        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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IStakingRewards {
    /// VIEWS
    // token state
    function totalSupply() external view returns (uint256);
    // staking state
    function balanceOf(address account) external view returns (uint256);
    function escrowedBalanceOf(address account) external view returns (uint256);
    function nonEscrowedBalanceOf(address account) external view returns (uint256);
    // rewards
    function getRewardForDuration() external view returns (uint256);
    function rewardPerToken() external view returns (uint256);
    function lastTimeRewardApplicable() external view returns (uint256);
    function earned(address account) external view returns (uint256);

    /// MUTATIVE
    // Staking/Unstaking
    function stake(uint256 amount) external;
    function unstake(uint256 amount) external;
    function stakeEscrow(address account, uint256 amount) external;
    function unstakeEscrow(address account, uint256 amount) external;
    function exit() external;
    // claim rewards
    function getReward() external;
    // settings
    function notifyRewardAmount(uint256 reward) external;
    function setRewardsDuration(uint256 _rewardsDuration) external;
    // pausable
    function pauseStakingRewards() external;
    function unpauseStakingRewards() external;
    // misc.
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.24;

interface ISupplySchedule {
    // Views
    function mintableSupply() external view returns (uint);

    function isMintable() external view returns (bool);

    // Mutative functions

    function mint() external;

    function setTreasuryDiversion(uint _treasuryDiversion) external;

    function setTradingRewardsDiversion(uint _tradingRewardsDiversion) external;
    
    function setStakingRewards(address _stakingRewards) external;

    function setTradingRewards(address _tradingRewards) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library VestingEntries {
    struct VestingEntry {
        uint64 endTime;
        uint256 escrowAmount;
        uint256 duration;
    }
    struct VestingEntryWithID {
        uint64 endTime;
        uint256 escrowAmount;
        uint256 entryID;
    }
}

interface IRewardEscrow {
    // Views
    function getKwentaAddress() external view returns (address);

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

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

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

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

    function getVestingQuantity(address account, uint256[] calldata entryIDs)
        external
        view
        returns (uint256, uint256);

    function getVestingSchedules(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (VestingEntries.VestingEntryWithID[] memory);

    function getAccountVestingEntryIDs(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (uint256[] memory);

    function getVestingEntryClaimable(address account, uint256 entryID)
        external
        view
        returns (uint256, uint256);

    function getVestingEntry(address account, uint256 entryID)
        external
        view
        returns (
            uint64,
            uint256,
            uint256
        );

    // Mutative functions
    function vest(uint256[] calldata entryIDs) external;

    function createEscrowEntry(
        address beneficiary,
        uint256 deposit,
        uint256 duration
    ) external;

    function appendVestingEntry(
        address account,
        uint256 quantity,
        uint256 duration
    ) external;

    function stakeEscrow(uint256 _amount) external;

    function unstakeEscrow(uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 ^0.8.0;

/**
 * @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;
        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");

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

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

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

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

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

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

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

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

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

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

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

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

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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0;

import "../contracts/StakingRewards.sol";

contract $StakingRewards is StakingRewards {
    constructor(address _token, address _rewardEscrow, address _supplySchedule) StakingRewards(_token, _rewardEscrow, _supplySchedule) {}

    function $_pause() external {
        return super._pause();
    }

    function $_unpause() external {
        return super._unpause();
    }

    function $_msgSender() external view returns (address) {
        return super._msgSender();
    }

    function $_msgData() external view returns (bytes memory) {
        return super._msgData();
    }
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0;

import "../../contracts/interfaces/IRewardEscrow.sol";

contract $VestingEntries {
    constructor() {}
}

abstract contract $IRewardEscrow is IRewardEscrow {
    constructor() {}
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0;

import "../../contracts/interfaces/IStakingRewards.sol";

abstract contract $IStakingRewards is IStakingRewards {
    constructor() {}
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0;

import "../../contracts/interfaces/ISupplySchedule.sol";

abstract contract $ISupplySchedule is ISupplySchedule {
    constructor() {}
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0;

import "../../contracts/utils/Owned.sol";

contract $Owned is Owned {
    constructor(address _owner) Owned(_owner) {}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ISupplySchedule","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unpauseStakingRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstakeEscrow","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000920cf626a271321c151d027030d5d08af699456b0000000000000000000000001066a8eb3d90af0ad3f89839b974658577e75be20000000000000000000000003e8b82326ff5f2f10da8cea117bd44343ccb9c26

-----Decoded View---------------
Arg [0] : _token (address): 0x920Cf626a271321C151D027030D5d08aF699456b
Arg [1] : _rewardEscrow (address): 0x1066A8eB3d90Af0Ad3F89839b974658577e75BE2
Arg [2] : _supplySchedule (address): 0x3e8b82326Ff5f2f10da8CEa117bD44343ccb9c26

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000920cf626a271321c151d027030d5d08af699456b
Arg [1] : 0000000000000000000000001066a8eb3d90af0ad3f89839b974658577e75be2
Arg [2] : 0000000000000000000000003e8b82326ff5f2f10da8cea117bd44343ccb9c26