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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "../interfaces/IPriceCalculator.sol";
import "../interfaces/IValidator.sol";
import "../interfaces/ILToken.sol";
import "../interfaces/ICore.sol";
import "../interfaces/IBEP20.sol";
import "../library/Constant.sol";

contract Validator is IValidator, Ownable {
  using SafeMath for uint256;

  /* ========== CONSTANT VARIABLES ========== */

  IPriceCalculator public oracle;
  uint256 private constant labPriceCollateralCap = 75e15;
  uint256 private constant DUST = 1000;

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

  ICore public core;
  address private LAB;

  bool public initialized;

  /* ========== INITIALIZER ========== */

  constructor() public {}

  function initialize(address _lab) external onlyOwner {
    require(initialized == false, "already initialized");

    LAB = _lab;

    initialized = true;
  }

  /// @notice priceCalculator address 를 설정
  /// @dev ZERO ADDRESS 로 설정할 수 없음
  /// @param _priceCalculator priceCalculator contract address
  function setPriceCalculator(address _priceCalculator) public onlyOwner {
    require(_priceCalculator != address(0), "Validator: invalid priceCalculator address");
    oracle = IPriceCalculator(_priceCalculator);
  }

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

  /// @notice View collateral, supply, borrow value in USD of account
  /// @param account account address
  /// @return collateralInUSD Total collateral value in USD
  /// @return supplyInUSD Total supply value in USD
  /// @return borrowInUSD Total borrow value in USD
  function getAccountLiquidity(
    address account
  ) external view override returns (uint256 collateralInUSD, uint256 supplyInUSD, uint256 borrowInUSD) {
    collateralInUSD = 0;
    supplyInUSD = 0;
    borrowInUSD = 0;

    address[] memory assets = core.marketListOf(account);
    uint256[] memory prices = oracle.getUnderlyingPrices(assets);
    for (uint256 i = 0; i < assets.length; i++) {
      require(prices[i] != 0, "Validator: price error");
      uint256 decimals = _getDecimals(assets[i]);
      Constant.AccountSnapshot memory snapshot = ILToken(payable(assets[i])).accountSnapshot(account);

      uint256 priceCollateral;
      if (assets[i] == LAB && prices[i] > labPriceCollateralCap) {
        priceCollateral = labPriceCollateralCap;
      } else {
        priceCollateral = prices[i];
      }

      uint256 collateralFactor = core.marketInfoOf(payable(assets[i])).collateralFactor;
      uint256 collateralValuePerShareInUSD = snapshot.exchangeRate.mul(priceCollateral).mul(collateralFactor).div(1e36);

      collateralInUSD = collateralInUSD.add(
        snapshot.gTokenBalance.mul(10 ** (18 - decimals)).mul(collateralValuePerShareInUSD).div(1e18)
      );
      supplyInUSD = supplyInUSD.add(
        snapshot.gTokenBalance.mul(snapshot.exchangeRate).mul(10 ** (18 - decimals)).mul(prices[i]).div(1e36)
      );
      borrowInUSD = borrowInUSD.add(snapshot.borrowBalance.mul(10 ** (18 - decimals)).mul(prices[i]).div(1e18));
    }
  }

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

  /// @notice core address 를 설정
  /// @dev ZERO ADDRESS 로 설정할 수 없음
  ///      설정 이후에는 다른 주소로 변경할 수 없음
  /// @param _core core contract address
  function setCore(address _core) external onlyOwner {
    require(_core != address(0), "Validator: invalid core address");
    require(address(core) == address(0), "Validator: core already set");
    core = ICore(_core);
  }

  /* ========== ALLOWED FUNCTIONS ========== */

  /// @notice View if redeem is allowed
  /// @param gToken gToken address
  /// @param redeemer Redeemer account
  /// @param redeemAmount Redeem amount of underlying token
  function redeemAllowed(address gToken, address redeemer, uint256 redeemAmount) external override returns (bool) {
    (, uint256 shortfall) = _getAccountLiquidityInternal(redeemer, gToken, redeemAmount, 0);
    return shortfall == 0;
  }

  /// @notice View if borrow is allowed
  /// @param gToken gToken address
  /// @param borrower Borrower address
  /// @param borrowAmount Borrow amount of underlying token
  function borrowAllowed(address gToken, address borrower, uint256 borrowAmount) external override returns (bool) {
    require(borrowAmount > DUST, "Validator: too small borrow amount");
    require(core.checkMembership(borrower, address(gToken)), "Validator: enterMarket required");
    require(oracle.getUnderlyingPrice(address(gToken)) > 0, "Validator: Underlying price error");

    // Borrow cap of 0 corresponds to unlimited borrowing
    uint256 borrowCap = core.marketInfoOf(gToken).borrowCap;
    if (borrowCap != 0) {
      uint256 totalBorrows = ILToken(payable(gToken)).accruedTotalBorrow();
      uint256 nextTotalBorrows = totalBorrows.add(borrowAmount);
      require(nextTotalBorrows < borrowCap, "Validator: market borrow cap reached");
    }

    (, uint256 shortfall) = _getAccountLiquidityInternal(borrower, gToken, 0, borrowAmount);
    return shortfall == 0;
  }

  /// @notice View if liquidate is allowed
  /// @param gToken gToken address
  /// @param borrower Borrower address
  /// @param liquidateAmount Underlying token amount to liquidate
  /// @param closeFactor Close factor
  function liquidateAllowed(
    address gToken,
    address borrower,
    uint256 liquidateAmount,
    uint256 closeFactor
  ) external override returns (bool) {
    // The borrower must have shortfall in order to be liquidate
    (, uint256 shortfall) = _getAccountLiquidityInternal(borrower, address(0), 0, 0);
    require(shortfall != 0, "Validator: Insufficient shortfall");

    // The liquidator may not repay more than what is allowed by the closeFactor
    uint256 borrowBalance = ILToken(payable(gToken)).accruedBorrowBalanceOf(borrower);
    uint256 maxClose = closeFactor.mul(borrowBalance).div(1e18);
    return liquidateAmount <= maxClose;
  }

  function gTokenAmountToSeize(
    address gTokenBorrowed,
    address gTokenCollateral,
    uint256 amount
  ) external override returns (uint256 seizeGAmount, uint256 rebateGAmount, uint256 liquidatorGAmount) {
    require(
      oracle.getUnderlyingPrice(gTokenBorrowed) != 0 && oracle.getUnderlyingPrice(gTokenCollateral) != 0,
      "Validator: price error"
    );

    uint256 exchangeRate = ILToken(payable(gTokenCollateral)).accruedExchangeRate();
    require(exchangeRate != 0, "Validator: exchangeRate of gTokenCollateral is zero");

    uint256 borrowedDecimals = _getDecimals(gTokenBorrowed);
    uint256 collateralDecimals = _getDecimals(gTokenCollateral);

    // seizeGTokenAmountBase18 =  ( repayAmount * (liquidationIncentive * priceBorrowed) / (priceCollateral * exchangeRate) )
    // seizeGTokenAmount = seizeGTokenAmountBase18 / (10 ** (18 - decimals))
    uint256 seizeGTokenAmountBase = amount
      .mul(10 ** (18 - borrowedDecimals))
      .mul(core.liquidationIncentive())
      .mul(oracle.getUnderlyingPrice(gTokenBorrowed))
      .div(oracle.getUnderlyingPrice(gTokenCollateral).mul(exchangeRate));

    seizeGAmount = seizeGTokenAmountBase.div(10 ** (18 - collateralDecimals));
    liquidatorGAmount = seizeGAmount;
    rebateGAmount = 0;
  }

  /* ========== PRIVATE FUNCTIONS ========== */

  function _getAccountLiquidityInternal(
    address account,
    address gToken,
    uint256 redeemAmount,
    uint256 borrowAmount
  ) private returns (uint256 liquidity, uint256 shortfall) {
    uint256 accCollateralValueInUSD;
    uint256 accBorrowValueInUSD;

    address[] memory assets = core.marketListOf(account);
    uint256[] memory prices = oracle.getUnderlyingPrices(assets);
    for (uint256 i = 0; i < assets.length; i++) {
      uint256 decimals = _getDecimals(assets[i]);
      require(prices[i] != 0, "Validator: price error");
      Constant.AccountSnapshot memory snapshot = ILToken(payable(assets[i])).accruedAccountSnapshot(account);

      uint256 collateralValuePerShareInUSD;
      if (assets[i] == LAB && prices[i] > labPriceCollateralCap) {
        collateralValuePerShareInUSD = snapshot
          .exchangeRate
          .mul(labPriceCollateralCap)
          .mul(core.marketInfoOf(payable(assets[i])).collateralFactor)
          .div(1e36);
      } else {
        collateralValuePerShareInUSD = snapshot
          .exchangeRate
          .mul(prices[i])
          .mul(core.marketInfoOf(payable(assets[i])).collateralFactor)
          .div(1e36);
      }

      accCollateralValueInUSD = accCollateralValueInUSD.add(
        snapshot.gTokenBalance.mul(10 ** (18 - decimals)).mul(collateralValuePerShareInUSD).div(1e18)
      );
      accBorrowValueInUSD = accBorrowValueInUSD.add(
        snapshot.borrowBalance.mul(10 ** (18 - decimals)).mul(prices[i]).div(1e18)
      );

      if (assets[i] == gToken) {
        accBorrowValueInUSD = accBorrowValueInUSD.add(
          _getAmountForAdditionalBorrowValue(
            redeemAmount,
            borrowAmount,
            collateralValuePerShareInUSD,
            prices[i],
            decimals
          )
        );
      }
    }

    liquidity = accCollateralValueInUSD > accBorrowValueInUSD ? accCollateralValueInUSD.sub(accBorrowValueInUSD) : 0;
    shortfall = accCollateralValueInUSD > accBorrowValueInUSD ? 0 : accBorrowValueInUSD.sub(accCollateralValueInUSD);
  }

  function _getAmountForAdditionalBorrowValue(
    uint256 redeemAmount,
    uint256 borrowAmount,
    uint256 collateralValuePerShareInUSD,
    uint256 price,
    uint256 decimals
  ) internal pure returns (uint256 additionalBorrowValueInUSD) {
    additionalBorrowValueInUSD = redeemAmount.mul(10 ** (18 - decimals)).mul(collateralValuePerShareInUSD).div(1e18);
    additionalBorrowValueInUSD = additionalBorrowValueInUSD.add(
      borrowAmount.mul(10 ** (18 - decimals)).mul(price).div(1e18)
    );
  }

  /// @notice View underlying token decimals by gToken address
  /// @param gToken gToken address
  function _getDecimals(address gToken) internal view returns (uint256 decimals) {
    address underlying = ILToken(gToken).underlying();
    if (underlying == address(0)) {
      decimals = 18; // ETH
    } else {
      decimals = IBEP20(underlying).decimals();
    }
  }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;

interface IPriceCalculator {
  struct ReferenceData {
    uint256 lastData;
    uint256 lastUpdated;
  }

  function priceOf(address asset) external view returns (uint256);

  function pricesOf(address[] memory assets) external view returns (uint256[] memory);

  function priceOfETH() external view returns (uint256);

  function getUnderlyingPrice(address gToken) external view returns (uint256);

  function getUnderlyingPrices(address[] memory gTokens) external view returns (uint256[] memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "../library/Constant.sol";

interface ILToken {
  function underlying() external view returns (address);

  function totalSupply() external view returns (uint256);

  function accountSnapshot(address account) external view returns (Constant.AccountSnapshot memory);

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

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

  function totalBorrow() external view returns (uint256);

  function _totalBorrow() external view returns (uint256);

  function totalReserve() external view returns (uint256);

  function reserveFactor() external view returns (uint256);

  function lastAccruedTime() external view returns (uint256);

  function accInterestIndex() external view returns (uint256);

  function exchangeRate() external view returns (uint256);

  function getCash() external view returns (uint256);

  function getRateModel() external view returns (address);

  function getAccInterestIndex() external view returns (uint256);

  function accruedAccountSnapshot(address account) external returns (Constant.AccountSnapshot memory);

  function accruedBorrowBalanceOf(address account) external returns (uint256);

  function accruedTotalBorrow() external returns (uint256);

  function accruedExchangeRate() external returns (uint256);

  function approve(address spender, uint256 amount) external returns (bool);

  function allowance(address owner, address spender) external view returns (uint256);

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

  function transfer(address dst, uint256 amount) external returns (bool);

  function transferFrom(address src, address dst, uint256 amount) external returns (bool);

  function supply(address account, uint256 underlyingAmount) external payable returns (uint256);

  function redeemToken(address account, uint256 gTokenAmount) external returns (uint256);

  function redeemUnderlying(address account, uint256 underlyingAmount) external returns (uint256);

  function borrow(address account, uint256 amount) external returns (uint256);

  function repayBorrow(address account, uint256 amount) external payable returns (uint256);

  function repayBorrowBehalf(address payer, address borrower, uint256 amount) external payable returns (uint256);

  function liquidateBorrow(
    address gTokenCollateral,
    address liquidator,
    address borrower,
    uint256 amount
  ) external payable returns (uint256 seizeGAmount, uint256 rebateGAmount, uint256 liquidatorGAmount);

  function seize(address liquidator, address borrower, uint256 gTokenAmount) external;

  function withdrawReserves() external;

  function transferTokensInternal(address spender, address src, address dst, uint256 amount) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;

library Constant {
  uint256 public constant CLOSE_FACTOR_MIN = 5e16;
  uint256 public constant CLOSE_FACTOR_MAX = 9e17;
  uint256 public constant COLLATERAL_FACTOR_MAX = 9e17;
  uint256 public constant LIQUIDATION_THRESHOLD_MAX = 9e17;
  uint256 public constant LIQUIDATION_BONUS_MAX = 5e17;

  enum EcoScorePreviewOption {
    LOCK,
    CLAIM,
    EXTEND,
    LOCK_MORE
  }

  enum LoanState {
    None,
    Active,
    Auction,
    Repaid,
    Defaulted
  }

  struct MarketInfo {
    bool isListed;
    uint256 supplyCap;
    uint256 borrowCap;
    uint256 collateralFactor;
  }

  struct BorrowInfo {
    uint256 borrow;
    uint256 interestIndex;
  }

  struct LoanData {
    uint256 loanId;
    LoanState state;
    address borrower;
    address gNft;
    address nftAsset;
    uint256 nftTokenId;
    uint256 borrowAmount;
    uint256 interestIndex;
    uint256 bidStartTimestamp;
    address bidderAddress;
    uint256 bidPrice;
    uint256 bidBorrowAmount;
    uint256 floorPrice;
    uint256 bidCount;
    address firstBidderAddress;
  }

  struct AccountSnapshot {
    uint256 gTokenBalance;
    uint256 borrowBalance;
    uint256 exchangeRate;
  }

  struct AccrueSnapshot {
    uint256 totalBorrow;
    uint256 totalReserve;
    uint256 accInterestIndex;
  }

  struct AccrueLoanSnapshot {
    uint256 totalBorrow;
    uint256 accInterestIndex;
  }

  struct DistributionInfo {
    uint256 supplySpeed;
    uint256 borrowSpeed;
    uint256 totalBoostedSupply;
    uint256 totalBoostedBorrow;
    uint256 accPerShareSupply;
    uint256 accPerShareBorrow;
    uint256 accruedAt;
  }

  struct DistributionAccountInfo {
    uint256 accuredLAB; // Unclaimed LAB rewards amount
    uint256 boostedSupply; // effective(boosted) supply balance of user  (since last_action)
    uint256 boostedBorrow; // effective(boosted) borrow balance of user  (since last_action)
    uint256 accPerShareSupply; // Last integral value of LAB rewards per share. ∫(LABRate(t) / totalShare(t) dt) from 0 till (last_action)
    uint256 accPerShareBorrow; // Last integral value of LAB rewards per share. ∫(LABRate(t) / totalShare(t) dt) from 0 till (last_action)
  }

  struct DistributionAPY {
    uint256 apySupplyLab;
    uint256 apyBorrowLab;
    uint256 apyAccountSupplyLab;
    uint256 apyAccountBorrowLab;
  }

  struct RebateCheckpoint {
    uint256 timestamp;
    uint256 totalScore;
    uint256 adminFeeRate;
    uint256 weeklyLabSpeed;
    uint256 additionalLabAmount;
    mapping(address => uint256) marketFees;
  }

  struct LockInfo {
    uint256 timestamp;
    uint256 amount;
    uint256 expiry;
  }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

interface IValidator {
  function redeemAllowed(address gToken, address redeemer, uint256 redeemAmount) external returns (bool);

  function borrowAllowed(address gToken, address borrower, uint256 borrowAmount) external returns (bool);

  function liquidateAllowed(
    address gTokenBorrowed,
    address borrower,
    uint256 repayAmount,
    uint256 closeFactor
  ) external returns (bool);

  function gTokenAmountToSeize(
    address gTokenBorrowed,
    address gTokenCollateral,
    uint256 actualRepayAmount
  ) external returns (uint256 seizeGAmount, uint256 rebateGAmount, uint256 liquidatorGAmount);

  function getAccountLiquidity(
    address account
  ) external view returns (uint256 collateralInUSD, uint256 supplyInUSD, uint256 borrowInUSD);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "../library/Constant.sol";

interface ICore {
  /* ========== Event ========== */
  event MarketSupply(address user, address gToken, uint256 uAmount);
  event MarketRedeem(address user, address gToken, uint256 uAmount);

  event MarketListed(address gToken);
  event MarketEntered(address gToken, address account);
  event MarketExited(address gToken, address account);

  event CloseFactorUpdated(uint256 newCloseFactor);
  event CollateralFactorUpdated(address gToken, uint256 newCollateralFactor);
  event LiquidationIncentiveUpdated(uint256 newLiquidationIncentive);
  event SupplyCapUpdated(address indexed gToken, uint256 newSupplyCap);
  event BorrowCapUpdated(address indexed gToken, uint256 newBorrowCap);
  event KeeperUpdated(address newKeeper);
  event NftCoreUpdated(address newNftCore);
  event ValidatorUpdated(address newValidator);
  event LABDistributorUpdated(address newLABDistributor);
  event RebateDistributorUpdated(address newRebateDistributor);
  event FlashLoan(
    address indexed target,
    address indexed initiator,
    address indexed asset,
    uint256 amount,
    uint256 premium
  );

  function nftCore() external view returns (address);

  function validator() external view returns (address);

  function rebateDistributor() external view returns (address);

  function allMarkets() external view returns (address[] memory);

  function marketListOf(address account) external view returns (address[] memory);

  function marketInfoOf(address gToken) external view returns (Constant.MarketInfo memory);

  function checkMembership(address account, address gToken) external view returns (bool);

  function accountLiquidityOf(
    address account
  ) external view returns (uint256 collateralInUSD, uint256 supplyInUSD, uint256 borrowInUSD);

  function closeFactor() external view returns (uint256);

  function liquidationIncentive() external view returns (uint256);

  function enterMarkets(address[] memory gTokens) external;

  function exitMarket(address gToken) external;

  function supply(address gToken, uint256 underlyingAmount) external payable returns (uint256);

  function redeemToken(address gToken, uint256 gTokenAmount) external returns (uint256 redeemed);

  function redeemUnderlying(address gToken, uint256 underlyingAmount) external returns (uint256 redeemed);

  function borrow(address gToken, uint256 amount) external;

  function nftBorrow(address gToken, address user, uint256 amount) external;

  function repayBorrow(address gToken, uint256 amount) external payable;

  function nftRepayBorrow(address gToken, address user, uint256 amount) external payable;

  function repayBorrowBehalf(address gToken, address borrower, uint256 amount) external payable;

  function liquidateBorrow(
    address gTokenBorrowed,
    address gTokenCollateral,
    address borrower,
    uint256 amount
  ) external payable;

  function claimLab() external;

  function claimLab(address market) external;

  function transferTokens(address spender, address src, address dst, uint256 amount) external;

  function compoundLab() external;
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

interface IBEP20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view returns (uint8);

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view returns (string memory);

  /**
   * @dev Returns the token name.
   */
  function name() external view returns (string memory);

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view returns (address);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address _owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @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.
 */
abstract 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 virtual 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 >=0.6.0 <0.8.0;

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

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

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"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"},{"inputs":[{"internalType":"address","name":"gToken","type":"address"},{"internalType":"address","name":"borrower","type":"address"},{"internalType":"uint256","name":"borrowAmount","type":"uint256"}],"name":"borrowAllowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"core","outputs":[{"internalType":"contract ICore","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"gTokenBorrowed","type":"address"},{"internalType":"address","name":"gTokenCollateral","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"gTokenAmountToSeize","outputs":[{"internalType":"uint256","name":"seizeGAmount","type":"uint256"},{"internalType":"uint256","name":"rebateGAmount","type":"uint256"},{"internalType":"uint256","name":"liquidatorGAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getAccountLiquidity","outputs":[{"internalType":"uint256","name":"collateralInUSD","type":"uint256"},{"internalType":"uint256","name":"supplyInUSD","type":"uint256"},{"internalType":"uint256","name":"borrowInUSD","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_lab","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"gToken","type":"address"},{"internalType":"address","name":"borrower","type":"address"},{"internalType":"uint256","name":"liquidateAmount","type":"uint256"},{"internalType":"uint256","name":"closeFactor","type":"uint256"}],"name":"liquidateAllowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"oracle","outputs":[{"internalType":"contract IPriceCalculator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"gToken","type":"address"},{"internalType":"address","name":"redeemer","type":"address"},{"internalType":"uint256","name":"redeemAmount","type":"uint256"}],"name":"redeemAllowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_core","type":"address"}],"name":"setCore","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_priceCalculator","type":"address"}],"name":"setPriceCalculator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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