Contract 0x59CDF902b6A964CD5dB04d28f12b774bFB876Be9

pragma solidity 0.5.17;

import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
import "openzeppelin-solidity/contracts/ownership/Ownable.sol";

import "./IStaking.sol";
import "./IERC20Permit.sol";
import "./TokenPool.sol";

import "./MasterChefTokenizerPolygon.sol";

/**
 * @title Token Geyser
 * @dev A smart-contract based mechanism to distribute tokens over time, inspired loosely by
 *      Compound and Uniswap.
 *
 *      Distribution tokens are added to a locked pool in the contract and become unlocked over time
 *      according to a once-configurable unlock schedule. Once unlocked, they are available to be
 *      claimed by users.
 *
 *      A user may deposit tokens to accrue ownership share over the unlocked pool. This owner share
 *      is a function of the number of tokens deposited as well as the length of time deposited.
 *      Specifically, a user's share of the currently-unlocked pool equals their "deposit-seconds"
 *      divided by the global "deposit-seconds". This aligns the new token distribution with long
 *      term supporters of the project, addressing one of the major drawbacks of simple airdrops.
 *
 *      More background and motivation available at:
 *      https://github.com/ampleforth/RFCs/blob/master/RFCs/rfc-1.md
 */
contract TokenGeyserPolygon is IStaking, Ownable {
    using SafeMath for uint256;

    event Staked(address indexed user, uint256 amount, uint256 total, bytes data);
    event Unstaked(address indexed user, uint256 amount, uint256 total, bytes data);
    event TokensClaimed(address indexed user, uint256 amount);
    event TokensLocked(uint256 amount, uint256 durationSec, uint256 total);
    // amount: Unlocked tokens, total: Total locked tokens
    event TokensUnlocked(uint256 amount, uint256 total);

    TokenPool private _stakingPool;
    TokenPool private _unlockedPool;
    TokenPool private _lockedPool;

    MasterChefTokenizerPolygon private _tokenizer;
    IERC20 private _unwrappedStakingToken;
    //
    // Time-bonus params
    //
    uint256 public constant BONUS_DECIMALS = 2;
    uint256 public startBonus = 0;
    uint256 public bonusPeriodSec = 0;

    //
    // Global accounting state
    //
    uint256 public totalLockedShares = 0;
    uint256 public totalStakingShares = 0;
    uint256 private _totalStakingShareSeconds = 0;
    uint256 private _lastAccountingTimestampSec = now;
    uint256 private _maxUnlockSchedules = 0;
    uint256 private _initialSharesPerToken = 0;

    //
    // User accounting state
    //
    // Represents a single stake for a user. A user may have multiple.
    struct Stake {
        uint256 stakingShares;
        uint256 timestampSec;
    }

    // Caches aggregated values from the User->Stake[] map to save computation.
    // If lastAccountingTimestampSec is 0, there's no entry for that user.
    struct UserTotals {
        uint256 stakingShares;
        uint256 stakingShareSeconds;
        uint256 lastAccountingTimestampSec;
    }

    // Aggregated staking values per user
    mapping(address => UserTotals) private _userTotals;

    // The collection of stakes for each user. Ordered by timestamp, earliest to latest.
    mapping(address => Stake[]) private _userStakes;

    //
    // Locked/Unlocked Accounting state
    //
    struct UnlockSchedule {
        uint256 initialLockedShares;
        uint256 unlockedShares;
        uint256 lastUnlockTimestampSec;
        uint256 endAtSec;
        uint256 durationSec;
    }

    UnlockSchedule[] public unlockSchedules;

    /**
     * @param stakingToken The token users deposit as stake.
     * @param distributionToken The token users receive as they unstake.
     * @param maxUnlockSchedules Max number of unlock stages, to guard against hitting gas limit.
     * @param startBonus_ Starting time bonus, BONUS_DECIMALS fixed point.
     *                    e.g. 25% means user gets 25% of max distribution tokens.
     * @param bonusPeriodSec_ Length of time for bonus to increase linearly to max.
     * @param initialSharesPerToken Number of shares to mint per staking token on first stake.
     */
    constructor(IERC20 stakingToken, IERC20 distributionToken, uint256 maxUnlockSchedules,
                uint256 startBonus_, uint256 bonusPeriodSec_, uint256 initialSharesPerToken,
                IERC20 unwrappedStakingToken_) public {
        // The start bonus must be some fraction of the max. (i.e. <= 100%)
        require(startBonus_ <= 10**BONUS_DECIMALS, 'TokenGeyser: start bonus too high');
        // If no period is desired, instead set startBonus = 100%
        // and bonusPeriod to a small value like 1sec.
        require(bonusPeriodSec_ != 0, 'TokenGeyser: bonus period is zero');
        require(initialSharesPerToken > 0, 'TokenGeyser: initialSharesPerToken is zero');

        _stakingPool = new TokenPool(stakingToken);
        _unlockedPool = new TokenPool(distributionToken);
        _lockedPool = new TokenPool(distributionToken);
        startBonus = startBonus_;
        bonusPeriodSec = bonusPeriodSec_;
        _maxUnlockSchedules = maxUnlockSchedules;
        _initialSharesPerToken = initialSharesPerToken;

        _tokenizer = MasterChefTokenizerPolygon(address(stakingToken)); // staking token will be the tokenizer
        _unwrappedStakingToken = unwrappedStakingToken_;

        _unwrappedStakingToken.approve(address(_tokenizer), uint256(-1)); // approve unwrapped LP token to be wrapped
        stakingToken.approve(address(this), uint256(-1)); // approve this address to get staked token from this contract and avoid to change _stakeFor
    }

    /**
     * @return The token users deposit as stake.
     */
    function getStakingToken() public view returns (IERC20) {
        return _stakingPool.token();
    }

    /**
     * @return The token users receive as they unstake.
     */
    function getDistributionToken() public view returns (IERC20) {
        assert(_unlockedPool.token() == _lockedPool.token());
        return _unlockedPool.token();
    }


    function permitWrapAndStake(uint256 amount, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external {
        IERC20Permit(address(_unwrappedStakingToken)).permit(msg.sender, address(this), amount, expiry, v, r, s);
        wrapAndStake(amount);
    }

    function permitWrapAndStakeUnlimited(uint256 amount, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external {
        IERC20Permit(address(_unwrappedStakingToken)).permit(msg.sender, address(this), uint256(-1), expiry, v, r, s);
        wrapAndStake(amount);
    }

    function wrapAndStake(uint256 amount) public {
        _unwrappedStakingToken.transferFrom(msg.sender, address(this), amount);
        _tokenizer.wrap(amount); // tokeniser will wrap tokens and send to geyser contract
        _stakeFor(address(this), msg.sender, amount); // msg.sender is the beneficiary
    }

    /**
     * @dev Transfers amount of deposit tokens from the user.
     * @param amount Number of deposit tokens to stake.
     * @param data Not used.
     */
    function stake(uint256 amount, bytes calldata data) external {
        _stakeFor(msg.sender, msg.sender, amount);
    }

    /**
     * @dev Transfers amount of deposit tokens from the caller on behalf of user.
     * @param user User address who gains credit for this stake operation.
     * @param amount Number of deposit tokens to stake.
     * @param data Not used.
     */
    function stakeFor(address user, uint256 amount, bytes calldata data) external onlyOwner {
        _stakeFor(msg.sender, user, amount);
    }

    /**
     * @dev Private implementation of staking methods.
     * @param staker User address who deposits tokens to stake.
     * @param beneficiary User address who gains credit for this stake operation.
     * @param amount Number of deposit tokens to stake.
     */
    function _stakeFor(address staker, address beneficiary, uint256 amount) private {
        require(amount > 0, 'TokenGeyser: stake amount is zero');
        require(beneficiary != address(0), 'TokenGeyser: beneficiary is zero address');
        require(totalStakingShares == 0 || totalStaked() > 0,
                'TokenGeyser: Invalid state. Staking shares exist, but no staking tokens do');

        uint256 mintedStakingShares = (totalStakingShares > 0)
            ? totalStakingShares.mul(amount).div(totalStaked())
            : amount.mul(_initialSharesPerToken);
        require(mintedStakingShares > 0, 'TokenGeyser: Stake amount is too small');

        updateAccounting();

        // 1. User Accounting
        UserTotals storage totals = _userTotals[beneficiary];
        totals.stakingShares = totals.stakingShares.add(mintedStakingShares);
        totals.lastAccountingTimestampSec = now;

        Stake memory newStake = Stake(mintedStakingShares, now);
        _userStakes[beneficiary].push(newStake);

        // 2. Global Accounting
        totalStakingShares = totalStakingShares.add(mintedStakingShares);
        // Already set in updateAccounting()
        // _lastAccountingTimestampSec = now;

        // interactions
        require(_stakingPool.token().transferFrom(staker, address(_stakingPool), amount),
            'TokenGeyser: transfer into staking pool failed');

        emit Staked(beneficiary, amount, totalStakedFor(beneficiary), "");
    }

    function unstakeAndUnwrap(uint256 amount) external {
        // this sends the rewards + wrapped stake to msg.sender
        _unstake(amount);
        // wLP are burned from msg.sender
        _tokenizer.unwrapFor(amount, msg.sender);
    }

    /**
     * @dev Unstakes a certain amount of previously deposited tokens. User also receives their
     * alotted number of distribution tokens.
     * @param amount Number of deposit tokens to unstake / withdraw.
     * @param data Not used.
     */
    function unstake(uint256 amount, bytes calldata data) external {
        _unstake(amount);
    }

    /**
     * @param amount Number of deposit tokens to unstake / withdraw.
     * @return The total number of distribution tokens that would be rewarded.
     */
    function unstakeQuery(uint256 amount) public returns (uint256) {
        return _unstake(amount);
    }

    /**
     * @dev Unstakes a certain amount of previously deposited tokens. User also receives their
     * alotted number of distribution tokens.
     * @param amount Number of deposit tokens to unstake / withdraw.
     * @return The total number of distribution tokens rewarded.
     */
    function _unstake(uint256 amount) private returns (uint256) {
        updateAccounting();

        // checks
        require(amount > 0, 'TokenGeyser: unstake amount is zero');
        require(totalStakedFor(msg.sender) >= amount,
            'TokenGeyser: unstake amount is greater than total user stakes');
        uint256 stakingSharesToBurn = totalStakingShares.mul(amount).div(totalStaked());
        require(stakingSharesToBurn > 0, 'TokenGeyser: Unable to unstake amount this small');

        // 1. User Accounting
        UserTotals storage totals = _userTotals[msg.sender];
        Stake[] storage accountStakes = _userStakes[msg.sender];

        // Redeem from most recent stake and go backwards in time.
        uint256 stakingShareSecondsToBurn = 0;
        uint256 sharesLeftToBurn = stakingSharesToBurn;
        uint256 rewardAmount = 0;
        while (sharesLeftToBurn > 0) {
            Stake storage lastStake = accountStakes[accountStakes.length - 1];
            uint256 stakeTimeSec = now.sub(lastStake.timestampSec);
            uint256 newStakingShareSecondsToBurn = 0;
            if (lastStake.stakingShares <= sharesLeftToBurn) {
                // fully redeem a past stake
                newStakingShareSecondsToBurn = lastStake.stakingShares.mul(stakeTimeSec);
                rewardAmount = computeNewReward(rewardAmount, newStakingShareSecondsToBurn, stakeTimeSec);
                stakingShareSecondsToBurn = stakingShareSecondsToBurn.add(newStakingShareSecondsToBurn);
                sharesLeftToBurn = sharesLeftToBurn.sub(lastStake.stakingShares);
                accountStakes.length--;
            } else {
                // partially redeem a past stake
                newStakingShareSecondsToBurn = sharesLeftToBurn.mul(stakeTimeSec);
                rewardAmount = computeNewReward(rewardAmount, newStakingShareSecondsToBurn, stakeTimeSec);
                stakingShareSecondsToBurn = stakingShareSecondsToBurn.add(newStakingShareSecondsToBurn);
                lastStake.stakingShares = lastStake.stakingShares.sub(sharesLeftToBurn);
                sharesLeftToBurn = 0;
            }
        }
        totals.stakingShareSeconds = totals.stakingShareSeconds.sub(stakingShareSecondsToBurn);
        totals.stakingShares = totals.stakingShares.sub(stakingSharesToBurn);
        // Already set in updateAccounting
        // totals.lastAccountingTimestampSec = now;

        // 2. Global Accounting
        _totalStakingShareSeconds = _totalStakingShareSeconds.sub(stakingShareSecondsToBurn);
        totalStakingShares = totalStakingShares.sub(stakingSharesToBurn);
        // Already set in updateAccounting
        // _lastAccountingTimestampSec = now;

        // interactions
        require(_stakingPool.transfer(msg.sender, amount),
            'TokenGeyser: transfer out of staking pool failed');
        require(_unlockedPool.transfer(msg.sender, rewardAmount),
            'TokenGeyser: transfer out of unlocked pool failed');

        emit Unstaked(msg.sender, amount, totalStakedFor(msg.sender), "");
        emit TokensClaimed(msg.sender, rewardAmount);

        require(totalStakingShares == 0 || totalStaked() > 0,
                "TokenGeyser: Error unstaking. Staking shares exist, but no staking tokens do");
        return rewardAmount;
    }

    /**
     * @dev Applies an additional time-bonus to a distribution amount. This is necessary to
     *      encourage long-term deposits instead of constant unstake/restakes.
     *      The bonus-multiplier is the result of a linear function that starts at startBonus and
     *      ends at 100% over bonusPeriodSec, then stays at 100% thereafter.
     * @param currentRewardTokens The current number of distribution tokens already alotted for this
     *                            unstake op. Any bonuses are already applied.
     * @param stakingShareSeconds The stakingShare-seconds that are being burned for new
     *                            distribution tokens.
     * @param stakeTimeSec Length of time for which the tokens were staked. Needed to calculate
     *                     the time-bonus.
     * @return Updated amount of distribution tokens to award, with any bonus included on the
     *         newly added tokens.
     */
    function computeNewReward(uint256 currentRewardTokens,
                                uint256 stakingShareSeconds,
                                uint256 stakeTimeSec) private view returns (uint256) {

        uint256 newRewardTokens =
            totalUnlocked()
            .mul(stakingShareSeconds)
            .div(_totalStakingShareSeconds);

        if (stakeTimeSec >= bonusPeriodSec) {
            return currentRewardTokens.add(newRewardTokens);
        }

        uint256 oneHundredPct = 10**BONUS_DECIMALS;
        uint256 bonusedReward =
            startBonus
            .add(oneHundredPct.sub(startBonus).mul(stakeTimeSec).div(bonusPeriodSec))
            .mul(newRewardTokens)
            .div(oneHundredPct);
        return currentRewardTokens.add(bonusedReward);
    }

    /**
     * @param addr The user to look up staking information for.
     * @return The number of staking tokens deposited for addr.
     */
    function totalStakedFor(address addr) public view returns (uint256) {
        return totalStakingShares > 0 ?
            totalStaked().mul(_userTotals[addr].stakingShares).div(totalStakingShares) : 0;
    }

    /**
     * @return The total number of deposit tokens staked globally, by all users.
     */
    function totalStaked() public view returns (uint256) {
        return _stakingPool.balance();
    }

    /**
     * @dev Note that this application has a staking token as well as a distribution token, which
     * may be different. This function is required by EIP-900.
     * @return The deposit token used for staking.
     */
    function token() external view returns (address) {
        return address(getStakingToken());
    }

    /**
     * @dev A globally callable function to update the accounting state of the system.
     *      Global state and state for the caller are updated.
     * @return [0] balance of the locked pool
     * @return [1] balance of the unlocked pool
     * @return [2] caller's staking share seconds
     * @return [3] global staking share seconds
     * @return [4] Rewards caller has accumulated, optimistically assumes max time-bonus.
     * @return [5] block timestamp
     */
    function updateAccounting() public returns (
        uint256, uint256, uint256, uint256, uint256, uint256) {

        unlockTokens();

        // Global accounting
        uint256 newStakingShareSeconds =
            now
            .sub(_lastAccountingTimestampSec)
            .mul(totalStakingShares);
        _totalStakingShareSeconds = _totalStakingShareSeconds.add(newStakingShareSeconds);
        _lastAccountingTimestampSec = now;

        // User Accounting
        UserTotals storage totals = _userTotals[msg.sender];
        uint256 newUserStakingShareSeconds =
            now
            .sub(totals.lastAccountingTimestampSec)
            .mul(totals.stakingShares);
        totals.stakingShareSeconds =
            totals.stakingShareSeconds
            .add(newUserStakingShareSeconds);
        totals.lastAccountingTimestampSec = now;

        uint256 totalUserRewards = (_totalStakingShareSeconds > 0)
            ? totalUnlocked().mul(totals.stakingShareSeconds).div(_totalStakingShareSeconds)
            : 0;

        return (
            totalLocked(),
            totalUnlocked(),
            totals.stakingShareSeconds,
            _totalStakingShareSeconds,
            totalUserRewards,
            now
        );
    }

    /**
     * @return Total number of locked distribution tokens.
     */
    function totalLocked() public view returns (uint256) {
        return _lockedPool.balance();
    }

    /**
     * @return Total number of unlocked distribution tokens.
     */
    function totalUnlocked() public view returns (uint256) {
        return _unlockedPool.balance();
    }

    /**
     * @return Number of unlock schedules.
     */
    function unlockScheduleCount() public view returns (uint256) {
        return unlockSchedules.length;
    }

    /**
     * @dev This funcion allows the contract owner to add more locked distribution tokens, along
     *      with the associated "unlock schedule". These locked tokens immediately begin unlocking
     *      linearly over the duraction of durationSec timeframe.
     * @param amount Number of distribution tokens to lock. These are transferred from the caller.
     * @param durationSec Length of time to linear unlock the tokens.
     */
    function lockTokens(uint256 amount, uint256 durationSec) external onlyOwner {
        require(unlockSchedules.length < _maxUnlockSchedules,
            'TokenGeyser: reached maximum unlock schedules');

        // Update lockedTokens amount before using it in computations after.
        updateAccounting();

        uint256 lockedTokens = totalLocked();
        uint256 mintedLockedShares = (lockedTokens > 0)
            ? totalLockedShares.mul(amount).div(lockedTokens)
            : amount.mul(_initialSharesPerToken);

        UnlockSchedule memory schedule;
        schedule.initialLockedShares = mintedLockedShares;
        schedule.lastUnlockTimestampSec = now;
        schedule.endAtSec = now.add(durationSec);
        schedule.durationSec = durationSec;
        unlockSchedules.push(schedule);

        totalLockedShares = totalLockedShares.add(mintedLockedShares);

        require(_lockedPool.token().transferFrom(msg.sender, address(_lockedPool), amount),
            'TokenGeyser: transfer into locked pool failed');
        emit TokensLocked(amount, durationSec, totalLocked());
    }

    /**
     * @dev Moves distribution tokens from the locked pool to the unlocked pool, according to the
     *      previously defined unlock schedules. Publicly callable.
     * @return Number of newly unlocked distribution tokens.
     */
    function unlockTokens() public returns (uint256) {
        uint256 unlockedTokens = 0;
        uint256 lockedTokens = totalLocked();

        if (totalLockedShares == 0) {
            unlockedTokens = lockedTokens;
        } else {
            uint256 unlockedShares = 0;
            for (uint256 s = 0; s < unlockSchedules.length; s++) {
                unlockedShares = unlockedShares.add(unlockScheduleShares(s));
            }
            unlockedTokens = unlockedShares.mul(lockedTokens).div(totalLockedShares);
            totalLockedShares = totalLockedShares.sub(unlockedShares);
        }

        if (unlockedTokens > 0) {
            require(_lockedPool.transfer(address(_unlockedPool), unlockedTokens),
                'TokenGeyser: transfer out of locked pool failed');
            emit TokensUnlocked(unlockedTokens, totalLocked());
        }

        return unlockedTokens;
    }

    /**
     * @dev Returns the number of unlockable shares from a given schedule. The returned value
     *      depends on the time since the last unlock. This function updates schedule accounting,
     *      but does not actually transfer any tokens.
     * @param s Index of the unlock schedule.
     * @return The number of unlocked shares.
     */
    function unlockScheduleShares(uint256 s) private returns (uint256) {
        UnlockSchedule storage schedule = unlockSchedules[s];

        if(schedule.unlockedShares >= schedule.initialLockedShares) {
            return 0;
        }

        uint256 sharesToUnlock = 0;
        // Special case to handle any leftover dust from integer division
        if (now >= schedule.endAtSec) {
            sharesToUnlock = (schedule.initialLockedShares.sub(schedule.unlockedShares));
            schedule.lastUnlockTimestampSec = schedule.endAtSec;
        } else {
            sharesToUnlock = now.sub(schedule.lastUnlockTimestampSec)
                .mul(schedule.initialLockedShares)
                .div(schedule.durationSec);
            schedule.lastUnlockTimestampSec = now;
        }

        schedule.unlockedShares = schedule.unlockedShares.add(sharesToUnlock);
        return sharesToUnlock;
    }

    /**
     * @dev Lets the owner rescue funds air-dropped to the staking pool.
     * @param tokenToRescue Address of the token to be rescued.
     * @param to Address to which the rescued funds are to be sent.
     * @param amount Amount of tokens to be rescued.
     * @return Transfer success.
     */
    function rescueFundsFromStakingPool(address tokenToRescue, address to, uint256 amount)
        public onlyOwner returns (bool) {

        return _stakingPool.rescueFunds(tokenToRescue, to, amount);
    }

    /**
     * @dev Let's the owner emergency shutdown the geyser. Funds from each TokenPool as sent to the idleFeeTreausry
     */
    function emergencyShutdown() external onlyOwner {
        // Treasury multisig on polygon
        address _idleFeeTreasury = address(0x61A944Ca131Ab78B23c8449e0A2eF935981D5cF6);

        _stakingPool.transfer(_idleFeeTreasury, _stakingPool.balance()); // send the wLP token to fee treasury, a subsequent unwrap will need to be called
        _unlockedPool.transfer(_idleFeeTreasury, _unlockedPool.balance());
        _lockedPool.transfer(_idleFeeTreasury, _lockedPool.balance());
    }
}

pragma solidity ^0.5.0;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * 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);
}

pragma solidity ^0.5.0;

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

pragma solidity 0.5.17;

/**
 * @title Staking interface, as defined by EIP-900.
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-900.md
 */
contract IStaking {
    event Staked(address indexed user, uint256 amount, uint256 total, bytes data);
    event Unstaked(address indexed user, uint256 amount, uint256 total, bytes data);

    function stake(uint256 amount, bytes calldata data) external;
    function stakeFor(address user, uint256 amount, bytes calldata data) external;
    function unstake(uint256 amount, bytes calldata data) external;
    function totalStakedFor(address addr) public view returns (uint256);
    function totalStaked() public view returns (uint256);
    function token() external view returns (address);

    /**
     * @return False. This application does not support staking history.
     */
    function supportsHistory() external pure returns (bool) {
        return false;
    }
}

pragma solidity 0.5.17;

interface IERC20Permit {
  function permit(address holder, address spender, uint256 nonce, uint256 expiry,
                  bool allowed, uint8 v, bytes32 r, bytes32 s) external;

  function permit(address holder, address spender, uint256 value, uint256 expiry,
                  uint8 v, bytes32 r, bytes32 s) external;
}

pragma solidity 0.5.17;

import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";

/**
 * @title A simple holder of tokens.
 * This is a simple contract to hold tokens. It's useful in the case where a separate contract
 * needs to hold multiple distinct pools of the same token.
 */
contract TokenPool is Ownable {
    IERC20 public token;

    constructor(IERC20 _token) public {
        token = _token;
    }

    function balance() public view returns (uint256) {
        return token.balanceOf(address(this));
    }

    function transfer(address to, uint256 value) external onlyOwner returns (bool) {
        return token.transfer(to, value);
    }

    function rescueFunds(address tokenToRescue, address to, uint256 amount) external onlyOwner returns (bool) {
        require(address(token) != tokenToRescue, 'TokenPool: Cannot claim token held by the contract');

        return IERC20(tokenToRescue).transfer(to, amount);
    }
}

pragma solidity 0.5.17;

import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
import "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
import "openzeppelin-solidity/contracts/math/SafeMath.sol";

interface IMasterChef {
  function deposit(uint256 _pid, uint256 _amount, address _to) external;
  function withdraw(uint256 _pid, uint256 _amount, address _to) external;
  function harvest(uint256 pid, address to) external;
  function withdrawAndHarvest(uint256 pid, uint256 amount, address to) external;
}

contract MasterChefTokenizerPolygon is Ownable, ERC20, ERC20Detailed {
  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  address public token; // sushi LP share
  address public masterChef;
  uint256 public pid;
  address private _geyser;

  constructor(
    string memory _name, // eg. IdleDAI
    string memory _symbol, // eg. IDLEDAI
    address _token,
    uint256 _pid
  ) public ERC20Detailed(_name, _symbol, uint8(18)) {
    token = _token;
    pid = _pid;
    masterChef = address(0x0769fd68dFb93167989C6f7254cd0D766Fb2841F); // polygon MiniChef v2
    Ownable(msg.sender);
    IERC20(_token).approve(masterChef, uint256(-1));
  }

  modifier onlyGeyser() {
    require(msg.sender == _geyser, "Tokenizer: Not Geyser");
    _;
  }

  function geyser() public view returns (address) {
    return _geyser;
  }

  function wrap(uint256 _amount) external {
    IERC20(token).safeTransferFrom(msg.sender, address(this), _amount);
    IMasterChef(masterChef).deposit(pid, _amount, address(this));
    _mint(msg.sender, _amount);
  }

  function unwrap(uint256 _amount, address _account) external {
    // IMasterChef(masterChef).withdrawAndHarvest(pid, _amount, address(this));
    IMasterChef(masterChef).withdraw(pid, _amount, address(this));
    _burn(msg.sender, _amount);
    IERC20(token).safeTransfer(_account, _amount);
  }

  function unwrapFor(uint256 _amount, address _account) external onlyGeyser {
    // IMasterChef(masterChef).withdrawAndHarvest(pid, _amount, address(this));
    IMasterChef(masterChef).withdraw(pid, _amount, address(this));
    _burn(_account, _amount);
    IERC20(token).safeTransfer(_account, _amount);
  }

  function transferGeyser(address geyser_) external onlyOwner {
    _geyser = geyser_;
  }

  // used both to rescue SUSHI rewards and eventually other tokens
  function rescueFunds(address tokenToRescue, address to, uint256 amount) external onlyOwner returns (bool) {
    return IERC20(tokenToRescue).transfer(to, amount);
  }

  // used both to rescue SUSHI rewards and eventually other tokens
  function harvestRewards() external onlyOwner {
    // Idle Treasury League Multisig wallet on polygon
    IMasterChef(masterChef).harvest(pid, address(0x61A944Ca131Ab78B23c8449e0A2eF935981D5cF6));
  }

  function emergencyShutdown(uint256 _amount) external onlyOwner {
    // Idle Treasury League Multisig wallet on polygon
    address _idleFeeTreasury = address(0x61A944Ca131Ab78B23c8449e0A2eF935981D5cF6);
    IMasterChef(masterChef).withdraw(pid, _amount, address(this));
    IERC20(token).safeTransfer(_idleFeeTreasury, _amount);
  }
}

pragma solidity ^0.5.0;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

pragma solidity ^0.5.0;

import "../../GSN/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 {ERC20Mintable}.
 *
 * 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;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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 {
        require(account != address(0), "ERC20: burn from the zero address");

        _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 is 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 {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

pragma solidity ^0.5.0;

import "./IERC20.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: 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;
    }
}

pragma solidity ^0.5.0;

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 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, "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.

        // 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");
        }
    }
}

pragma solidity ^0.5.5;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IERC20","name":"stakingToken","type":"address"},{"internalType":"contract IERC20","name":"distributionToken","type":"address"},{"internalType":"uint256","name":"maxUnlockSchedules","type":"uint256"},{"internalType":"uint256","name":"startBonus_","type":"uint256"},{"internalType":"uint256","name":"bonusPeriodSec_","type":"uint256"},{"internalType":"uint256","name":"initialSharesPerToken","type":"uint256"},{"internalType":"contract IERC20","name":"unwrappedStakingToken_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"TokensClaimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"durationSec","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"}],"name":"TokensLocked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"}],"name":"TokensUnlocked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Unstaked","type":"event"},{"constant":true,"inputs":[],"name":"BONUS_DECIMALS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"bonusPeriodSec","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"emergencyShutdown","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getDistributionToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getStakingToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"durationSec","type":"uint256"}],"name":"lockTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permitWrapAndStake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permitWrapAndStakeUnlimited","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"tokenToRescue","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueFundsFromStakingPool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"stake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"stakeFor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"startBonus","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"supportsHistory","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalLocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalLockedShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"totalStakedFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalStakingShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalUnlocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"unlockScheduleCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"unlockSchedules","outputs":[{"internalType":"uint256","name":"initialLockedShares","type":"uint256"},{"internalType":"uint256","name":"unlockedShares","type":"uint256"},{"internalType":"uint256","name":"lastUnlockTimestampSec","type":"uint256"},{"internalType":"uint256","name":"endAtSec","type":"uint256"},{"internalType":"uint256","name":"durationSec","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unlockTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"unstake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstakeAndUnwrap","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstakeQuery","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"updateAccounting","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"wrapAndStake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000000ac74fe6f3c9123254418eefce37e4f7271a2b72000000000000000000000000c25351811983818c9fe6d8c580531819c8ade90f0000000000000000000000000000000000000000000000000000000000002710000000000000000000000000000000000000000000000000000000000000002100000000000000000000000000000000000000000000000000000000004f1a0000000000000000000000000000000000000000000000000000000000000f42400000000000000000000000005518a3af961eee8771657050c5cb23d2b3e2f6ee

-----Decoded View---------------
Arg [0] : stakingToken (address): 0x0ac74fe6f3c9123254418eefce37e4f7271a2b72
Arg [1] : distributionToken (address): 0xc25351811983818c9fe6d8c580531819c8ade90f
Arg [2] : maxUnlockSchedules (uint256): 10000
Arg [3] : startBonus_ (uint256): 33
Arg [4] : bonusPeriodSec_ (uint256): 5184000
Arg [5] : initialSharesPerToken (uint256): 1000000
Arg [6] : unwrappedStakingToken_ (address): 0x5518a3af961eee8771657050c5cb23d2b3e2f6ee

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000ac74fe6f3c9123254418eefce37e4f7271a2b72
Arg [1] : 000000000000000000000000c25351811983818c9fe6d8c580531819c8ade90f
Arg [2] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000021
Arg [4] : 00000000000000000000000000000000000000000000000000000000004f1a00
Arg [5] : 00000000000000000000000000000000000000000000000000000000000f4240
Arg [6] : 0000000000000000000000005518a3af961eee8771657050c5cb23d2b3e2f6ee