Contract Source Code (Solidity Standard Json-Input format)

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pragma solidity 0.7.6;
pragma abicoder v2;

import "../interfaces/IChefIncentivesController.sol";
import "../interfaces/IMultiFeeDistribution.sol";
import "../dependencies/openzeppelin/contracts/IERC20.sol";
import "../dependencies/openzeppelin/contracts/SafeERC20.sol";
import "../dependencies/openzeppelin/contracts/SafeMath.sol";
import "../dependencies/openzeppelin/contracts/Ownable.sol";


interface IMintableToken is IERC20 {
    function mint(address _receiver, uint256 _amount) external returns (bool);
    function setMinter(address _minter) external returns (bool);
}

// Based on Ellipsis EPS Staker
// https://github.com/ellipsis-finance/ellipsis/blob/master/contracts/EpsStaker.sol
contract MultiFeeDistribution is IMultiFeeDistribution, Ownable {

    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using SafeERC20 for IMintableToken;

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

    struct Reward {
        uint256 periodFinish;
        uint256 rewardRate;
        uint256 lastUpdateTime;
        uint256 rewardPerTokenStored;
        // tracks already-added balances to handle accrued interest in aToken rewards
        // for the stakingToken this value is unused and will always be 0
        uint256 balance;
    }
    struct Balances {
        uint256 total;
        uint256 unlocked;
        uint256 locked;
        uint256 earned;
    }
    struct LockedBalance {
        uint256 amount;
        uint256 unlockTime;
    }
    struct RewardData {
        address token;
        uint256 amount;
    }

    IChefIncentivesController public incentivesController;
    IMintableToken public immutable stakingToken;
    address[] public rewardTokens;
    mapping(address => Reward) public rewardData;

    // Duration that rewards are streamed over
    uint256 public constant rewardsDuration = 86400 * 7;

    // Duration of lock/earned penalty period
    uint256 public constant lockDuration = rewardsDuration * 13;

    // Addresses approved to call mint
    mapping(address => bool) public minters;
    bool public mintersAreSet;

    // user -> reward token -> amount
    mapping(address => mapping(address => uint256)) public userRewardPerTokenPaid;
    mapping(address => mapping(address => uint256)) public rewards;

    uint256 public totalSupply;
    uint256 public lockedSupply;

    // Private mappings for balance data
    mapping(address => Balances) private balances;
    mapping(address => LockedBalance[]) private userLocks;
    mapping(address => LockedBalance[]) private userEarnings;

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

    constructor(address _stakingToken) Ownable() {
        stakingToken = IMintableToken(_stakingToken);
        IMintableToken(_stakingToken).setMinter(address(this));
        // First reward MUST be the staking token or things will break
        // related to the 50% penalty and distribution to locked balances
        rewardTokens.push(_stakingToken);
        rewardData[_stakingToken].lastUpdateTime = block.timestamp;
    }

    /* ========== ADMIN CONFIGURATION ========== */

    function setMinters(address[] memory _minters) external onlyOwner {
        require(!mintersAreSet);
        for (uint i; i < _minters.length; i++) {
            minters[_minters[i]] = true;
        }
        mintersAreSet = true;
    }

    function setIncentivesController(IChefIncentivesController _controller) external onlyOwner {
        incentivesController = _controller;
    }

    // Add a new reward token to be distributed to stakers
    function addReward(address _rewardsToken) external override onlyOwner {
        require(rewardData[_rewardsToken].lastUpdateTime == 0);
        rewardTokens.push(_rewardsToken);
        rewardData[_rewardsToken].lastUpdateTime = block.timestamp;
        rewardData[_rewardsToken].periodFinish = block.timestamp;
    }

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

    function _rewardPerToken(address _rewardsToken, uint256 _supply) internal view returns (uint256) {
        if (_supply == 0) {
            return rewardData[_rewardsToken].rewardPerTokenStored;
        }
        return
            rewardData[_rewardsToken].rewardPerTokenStored.add(
                lastTimeRewardApplicable(_rewardsToken).sub(
                    rewardData[_rewardsToken].lastUpdateTime).mul(
                        rewardData[_rewardsToken].rewardRate).mul(1e18).div(_supply)
            );
    }

    function _earned(
        address _user,
        address _rewardsToken,
        uint256 _balance,
        uint256 _currentRewardPerToken
    ) internal view returns (uint256) {
        return _balance.mul(
            _currentRewardPerToken.sub(userRewardPerTokenPaid[_user][_rewardsToken])
        ).div(1e18).add(rewards[_user][_rewardsToken]);
    }

    function lastTimeRewardApplicable(address _rewardsToken) public view returns (uint256) {
        uint periodFinish = rewardData[_rewardsToken].periodFinish;
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    function rewardPerToken(address _rewardsToken) external view returns (uint256) {
        uint256 supply = _rewardsToken == address(stakingToken) ? lockedSupply : totalSupply;
        return _rewardPerToken(_rewardsToken, supply);

    }

    function getRewardForDuration(address _rewardsToken) external view returns (uint256) {
        return rewardData[_rewardsToken].rewardRate.mul(rewardsDuration).div(1e12);
    }

    // Address and claimable amount of all reward tokens for the given account
    function claimableRewards(address account) external view returns (RewardData[] memory rewards) {
        rewards = new RewardData[](rewardTokens.length);
        for (uint256 i = 0; i < rewards.length; i++) {
            // If i == 0 this is the stakingReward, distribution is based on locked balances
            uint256 balance = i == 0 ? balances[account].locked : balances[account].total;
            uint256 supply = i == 0 ? lockedSupply : totalSupply;
            rewards[i].token = rewardTokens[i];
            rewards[i].amount = _earned(account, rewards[i].token, balance, _rewardPerToken(rewardTokens[i], supply)).div(1e12);
        }
        return rewards;
    }

    // Total balance of an account, including unlocked, locked and earned tokens
    function totalBalance(address user) view external returns (uint256 amount) {
        return balances[user].total;
    }

    // Total withdrawable balance for an account to which no penalty is applied
    function unlockedBalance(address user) view external returns (uint256 amount) {
        amount = balances[user].unlocked;
        LockedBalance[] storage earnings = userEarnings[msg.sender];
        for (uint i = 0; i < earnings.length; i++) {
            if (earnings[i].unlockTime > block.timestamp) {
                break;
            }
            amount = amount.add(earnings[i].amount);
        }
        return amount;
    }

    // Information on the "earned" balances of a user
    // Earned balances may be withdrawn immediately for a 50% penalty
    function earnedBalances(
        address user
    ) view external returns (
        uint256 total,
        LockedBalance[] memory earningsData
    ) {
        LockedBalance[] storage earnings = userEarnings[user];
        uint256 idx;
        for (uint i = 0; i < earnings.length; i++) {
            if (earnings[i].unlockTime > block.timestamp) {
                if (idx == 0) {
                    earningsData = new LockedBalance[](earnings.length - i);
                }
                earningsData[idx] = earnings[i];
                idx++;
                total = total.add(earnings[i].amount);
            }
        }
        return (total, earningsData);
    }

    // Information on a user's locked balances
    function lockedBalances(
        address user
    ) view external returns (
        uint256 total,
        uint256 unlockable,
        uint256 locked,
        LockedBalance[] memory lockData
    ) {
        LockedBalance[] storage locks = userLocks[user];
        uint256 idx;
        for (uint i = 0; i < locks.length; i++) {
            if (locks[i].unlockTime > block.timestamp) {
                if (idx == 0) {
                    lockData = new LockedBalance[](locks.length - i);
                }
                lockData[idx] = locks[i];
                idx++;
                locked = locked.add(locks[i].amount);
            } else {
                unlockable = unlockable.add(locks[i].amount);
            }
        }
        return (balances[user].locked, unlockable, locked, lockData);
    }

    // Final balance received and penalty balance paid by user upon calling exit
    function withdrawableBalance(
        address user
    ) view public returns (
        uint256 amount,
        uint256 penaltyAmount
    ) {
        Balances storage bal = balances[user];
        uint256 earned = bal.earned;
        if (earned > 0) {
            uint256 amountWithoutPenalty;
            uint256 length = userEarnings[user].length;
            for (uint i = 0; i < length; i++) {
                uint256 earnedAmount = userEarnings[user][i].amount;
                if (earnedAmount == 0) continue;
                if (userEarnings[user][i].unlockTime > block.timestamp) {
                    break;
                }
                amountWithoutPenalty = amountWithoutPenalty.add(earnedAmount);
            }

            penaltyAmount = earned.sub(amountWithoutPenalty).div(2);
        }
        amount = bal.unlocked.add(earned).sub(penaltyAmount);
        return (amount, penaltyAmount);
    }

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

    // Stake tokens to receive rewards
    // Locked tokens cannot be withdrawn for lockDuration and are eligible to receive stakingReward rewards
    function stake(uint256 amount, bool lock) external {
        require(amount > 0, "Cannot stake 0");
        _updateReward(msg.sender);
        totalSupply = totalSupply.add(amount);
        Balances storage bal = balances[msg.sender];
        bal.total = bal.total.add(amount);
        if (lock) {
            lockedSupply = lockedSupply.add(amount);
            bal.locked = bal.locked.add(amount);
            uint256 unlockTime = block.timestamp.div(rewardsDuration).mul(rewardsDuration).add(lockDuration);
            uint256 idx = userLocks[msg.sender].length;
            if (idx == 0 || userLocks[msg.sender][idx-1].unlockTime < unlockTime) {
                userLocks[msg.sender].push(LockedBalance({amount: amount, unlockTime: unlockTime}));
            } else {
                userLocks[msg.sender][idx-1].amount = userLocks[msg.sender][idx-1].amount.add(amount);
            }
        } else {
            bal.unlocked = bal.unlocked.add(amount);
        }
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount, lock);
    }

    // Mint new tokens
    // Minted tokens receive rewards normally but incur a 50% penalty when
    // withdrawn before lockDuration has passed.
    function mint(address user, uint256 amount, bool withPenalty) external override {
        require(minters[msg.sender]);
        if (amount == 0) return;
        _updateReward(user);
        stakingToken.mint(address(this), amount);
        if (user == address(this)) {
            // minting to this contract adds the new tokens as incentives for lockers
            _notifyReward(address(stakingToken), amount);
            return;
        }
        totalSupply = totalSupply.add(amount);
        Balances storage bal = balances[user];
        bal.total = bal.total.add(amount);
        if (withPenalty) {
            bal.earned = bal.earned.add(amount);
            uint256 unlockTime = block.timestamp.div(rewardsDuration).mul(rewardsDuration).add(lockDuration);
            LockedBalance[] storage earnings = userEarnings[user];
            uint256 idx = earnings.length;
            if (idx == 0 || earnings[idx-1].unlockTime < unlockTime) {
                earnings.push(LockedBalance({amount: amount, unlockTime: unlockTime}));
            } else {
                earnings[idx-1].amount = earnings[idx-1].amount.add(amount);
            }
        } else {
            bal.unlocked = bal.unlocked.add(amount);
        }
        emit Staked(user, amount, false);
    }

    // Withdraw staked tokens
    // First withdraws unlocked tokens, then earned tokens. Withdrawing earned tokens
    // incurs a 50% penalty which is distributed based on locked balances.
    function withdraw(uint256 amount) public {
        require(amount > 0, "Cannot withdraw 0");
        _updateReward(msg.sender);
        Balances storage bal = balances[msg.sender];
        uint256 penaltyAmount;

        if (amount <= bal.unlocked) {
            bal.unlocked = bal.unlocked.sub(amount);
        } else {
            uint256 remaining = amount.sub(bal.unlocked);
            require(bal.earned >= remaining, "Insufficient unlocked balance");
            bal.unlocked = 0;
            bal.earned = bal.earned.sub(remaining);
            for (uint i = 0; ; i++) {
                uint256 earnedAmount = userEarnings[msg.sender][i].amount;
                if (earnedAmount == 0) continue;
                if (penaltyAmount == 0 && userEarnings[msg.sender][i].unlockTime > block.timestamp) {
                    penaltyAmount = remaining;
                    require(bal.earned >= remaining, "Insufficient balance after penalty");
                    bal.earned = bal.earned.sub(remaining);
                    if (bal.earned == 0) {
                        delete userEarnings[msg.sender];
                        break;
                    }
                    remaining = remaining.mul(2);
                }
                if (remaining <= earnedAmount) {
                    userEarnings[msg.sender][i].amount = earnedAmount.sub(remaining);
                    break;
                } else {
                    delete userEarnings[msg.sender][i];
                    remaining = remaining.sub(earnedAmount);
                }
            }
        }

        uint256 adjustedAmount = amount.add(penaltyAmount);
        bal.total = bal.total.sub(adjustedAmount);
        totalSupply = totalSupply.sub(adjustedAmount);
        stakingToken.safeTransfer(msg.sender, amount);
        if (penaltyAmount > 0) {
            incentivesController.claim(address(this), new address[](0));
            _notifyReward(address(stakingToken), penaltyAmount);
        }
        emit Withdrawn(msg.sender, amount, penaltyAmount);
    }

    function _getReward(address[] memory _rewardTokens) internal {
        uint256 length = _rewardTokens.length;
        for (uint i; i < length; i++) {
            address token = _rewardTokens[i];
            uint256 reward = rewards[msg.sender][token].div(1e12);
            if (token != address(stakingToken)) {
                // for rewards other than stakingToken, every 24 hours we check if new
                // rewards were sent to the contract or accrued via aToken interest
                Reward storage r = rewardData[token];
                uint256 periodFinish = r.periodFinish;
                require(periodFinish > 0, "Unknown reward token");
                uint256 balance = r.balance;
                if (periodFinish < block.timestamp.add(rewardsDuration - 86400)) {
                    uint256 unseen = IERC20(token).balanceOf(address(this)).sub(balance);
                    if (unseen > 0) {
                        _notifyReward(token, unseen);
                        balance = balance.add(unseen);
                    }
                }
                r.balance = balance.sub(reward);
            }
            if (reward == 0) continue;
            rewards[msg.sender][token] = 0;
            IERC20(token).safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, token, reward);
        }
    }

    // Claim all pending staking rewards
    function getReward(address[] memory _rewardTokens) public {
        _updateReward(msg.sender);
        _getReward(_rewardTokens);
    }

    // Withdraw full unlocked balance and optionally claim pending rewards
    function exit(bool claimRewards) external {
        _updateReward(msg.sender);
        (uint256 amount, uint256 penaltyAmount) = withdrawableBalance(msg.sender);
        delete userEarnings[msg.sender];
        Balances storage bal = balances[msg.sender];
        bal.total = bal.total.sub(bal.unlocked).sub(bal.earned);
        bal.unlocked = 0;
        bal.earned = 0;

        totalSupply = totalSupply.sub(amount.add(penaltyAmount));
        stakingToken.safeTransfer(msg.sender, amount);
        if (penaltyAmount > 0) {
            incentivesController.claim(address(this), new address[](0));
            _notifyReward(address(stakingToken), penaltyAmount);
        }
        if (claimRewards) {
            _getReward(rewardTokens);
        }
        emit Withdrawn(msg.sender, amount, penaltyAmount);
    }

    // Withdraw all currently locked tokens where the unlock time has passed
    function withdrawExpiredLocks() external {
        _updateReward(msg.sender);
        LockedBalance[] storage locks = userLocks[msg.sender];
        Balances storage bal = balances[msg.sender];
        uint256 amount;
        uint256 length = locks.length;
        if (locks[length-1].unlockTime <= block.timestamp) {
            amount = bal.locked;
            delete userLocks[msg.sender];
        } else {
            for (uint i = 0; i < length; i++) {
                if (locks[i].unlockTime > block.timestamp) break;
                amount = amount.add(locks[i].amount);
                delete locks[i];
            }
        }
        bal.locked = bal.locked.sub(amount);
        bal.total = bal.total.sub(amount);
        totalSupply = totalSupply.sub(amount);
        lockedSupply = lockedSupply.sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount, 0);
    }

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

    function _notifyReward(address _rewardsToken, uint256 reward) internal {
        Reward storage r = rewardData[_rewardsToken];
        if (block.timestamp >= r.periodFinish) {
            r.rewardRate = reward.mul(1e12).div(rewardsDuration);
        } else {
            uint256 remaining = r.periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(r.rewardRate).div(1e12);
            r.rewardRate = reward.add(leftover).mul(1e12).div(rewardsDuration);
        }

        r.lastUpdateTime = block.timestamp;
        r.periodFinish = block.timestamp.add(rewardsDuration);

    }

    // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        require(tokenAddress != address(stakingToken), "Cannot withdraw staking token");
        require(rewardData[tokenAddress].lastUpdateTime == 0, "Cannot withdraw reward token");
        IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function _updateReward(address account) internal {
        address token = address(stakingToken);
        uint256 balance;
        Reward storage r = rewardData[token];
        uint256 rpt = _rewardPerToken(token, lockedSupply);
        r.rewardPerTokenStored = rpt;
        r.lastUpdateTime = lastTimeRewardApplicable(token);
        if (account != address(this)) {
            // Special case, use the locked balances and supply for stakingReward rewards
            rewards[account][token] = _earned(account, token, balances[account].locked, rpt);
            userRewardPerTokenPaid[account][token] = rpt;
            balance = balances[account].total;
        }

        uint256 supply = totalSupply;
        uint256 length = rewardTokens.length;
        for (uint i = 1; i < length; i++) {
            token = rewardTokens[i];
            r = rewardData[token];
            rpt = _rewardPerToken(token, supply);
            r.rewardPerTokenStored = rpt;
            r.lastUpdateTime = lastTimeRewardApplicable(token);
            if (account != address(this)) {
                rewards[account][token] = _earned(account, token, balance, rpt);
                userRewardPerTokenPaid[account][token] = rpt;
            }
        }
    }

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

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount, bool locked);
    event Withdrawn(address indexed user, uint256 receivedAmount, uint256 penaltyPaid);
    event RewardPaid(address indexed user, address indexed rewardsToken, uint256 reward);
    event RewardsDurationUpdated(address token, uint256 newDuration);
    event Recovered(address token, uint256 amount);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

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

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

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

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

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

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @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 0.7.6;

import './Context.sol';

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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() {
    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(_owner == _msgSender(), 'Ownable: caller is not the owner');
    _;
  }

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

// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;

import {IERC20} from './IERC20.sol';
import {SafeMath} from './SafeMath.sol';
import {Address} from './Address.sol';

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  using SafeMath for uint256;
  using Address for address;

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

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

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    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 callOptionalReturn(IERC20 token, bytes memory data) private {
    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');
    }
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @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.
   */
  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.
   */
  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.
   */
  function mod(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;

interface IChefIncentivesController {

  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param user The address of the user
   * @param userBalance The balance of the user of the asset in the lending pool
   * @param totalSupply The total supply of the asset in the lending pool
   **/
  function handleAction(
    address user,
    uint256 userBalance,
    uint256 totalSupply
  ) external;

    function addPool(address _token, uint256 _allocPoint) external;

    function claim(address _user, address[] calldata _tokens) external;

    function setClaimReceiver(address _user, address _receiver) external;

}

pragma solidity 0.7.6;

interface IMultiFeeDistribution {

    function addReward(address rewardsToken) external;
    function mint(address user, uint256 amount, bool withPenalty) external;

}

{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_stakingToken","type":"address"}],"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":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Recovered","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"rewardsToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardPaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"newDuration","type":"uint256"}],"name":"RewardsDurationUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bool","name":"locked","type":"bool"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"receivedAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"penaltyPaid","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[{"internalType":"address","name":"_rewardsToken","type":"address"}],"name":"addReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"claimableRewards","outputs":[{"components":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct MultiFeeDistribution.RewardData[]","name":"rewards","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"earnedBalances","outputs":[{"internalType":"uint256","name":"total","type":"uint256"},{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"}],"internalType":"struct MultiFeeDistribution.LockedBalance[]","name":"earningsData","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"claimRewards","type":"bool"}],"name":"exit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_rewardTokens","type":"address[]"}],"name":"getReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardsToken","type":"address"}],"name":"getRewardForDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"incentivesController","outputs":[{"internalType":"contract IChefIncentivesController","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardsToken","type":"address"}],"name":"lastTimeRewardApplicable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"lockedBalances","outputs":[{"internalType":"uint256","name":"total","type":"uint256"},{"internalType":"uint256","name":"unlockable","type":"uint256"},{"internalType":"uint256","name":"locked","type":"uint256"},{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"}],"internalType":"struct MultiFeeDistribution.LockedBalance[]","name":"lockData","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockedSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"withPenalty","type":"bool"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"minters","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintersAreSet","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"tokenAmount","type":"uint256"}],"name":"recoverERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardData","outputs":[{"internalType":"uint256","name":"periodFinish","type":"uint256"},{"internalType":"uint256","name":"rewardRate","type":"uint256"},{"internalType":"uint256","name":"lastUpdateTime","type":"uint256"},{"internalType":"uint256","name":"rewardPerTokenStored","type":"uint256"},{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardsToken","type":"address"}],"name":"rewardPerToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardTokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"rewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardsDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IChefIncentivesController","name":"_controller","type":"address"}],"name":"setIncentivesController","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_minters","type":"address[]"}],"name":"setMinters","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"lock","type":"bool"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakingToken","outputs":[{"internalType":"contract IMintableToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"totalBalance","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"unlockedBalance","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawExpiredLocks","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"withdrawableBalance","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"penaltyAmount","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000f3e4e939939fa0040b8ceb6efa7c0bf0039dc781

-----Decoded View---------------
Arg [0] : _stakingToken (address): 0xF3e4E939939fa0040b8ceb6Efa7c0BF0039dc781

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000f3e4e939939fa0040b8ceb6efa7c0bf0039dc781