Contract Diff Checker

Contract Name:
Qore

Contract Source Code:

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./interfaces/IQToken.sol";
import "./interfaces/IQValidator.sol";

import "./QoreAdmin.sol";


contract Qore is QoreAdmin {
    using SafeMath for uint;

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

    address internal constant WBNB = 0xae13d989daC2f0dEbFf460aC112a837C89BAa7cd;

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

    mapping(address => address[]) public marketListOfUsers; // (account => qTokenAddress[])
    mapping(address => mapping(address => bool)) public usersOfMarket; // (qTokenAddress => (account => joined))
    address[] public totalUserList;

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

    function initialize() external initializer {
        __Qore_init();
    }

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

    modifier onlyMemberOfMarket(address qToken) {
        require(usersOfMarket[qToken][msg.sender], "Qore: must enter market");
        _;
    }

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

    function allMarkets() external view override returns (address[] memory) {
        return markets;
    }

    function marketInfoOf(address qToken) external view override returns (QConstant.MarketInfo memory) {
        return marketInfos[qToken];
    }

    function marketListOf(address account) external view override returns (address[] memory) {
        return marketListOfUsers[account];
    }

    function checkMembership(address account, address qToken) external view override returns (bool) {
        return usersOfMarket[qToken][account];
    }

    function getTotalUserList() external view override returns (address[] memory) {
        return totalUserList;
    }

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

    function enterMarkets(address[] memory qTokens) public override {
        for (uint i = 0; i < qTokens.length; i++) {
            _enterMarket(payable(qTokens[i]), msg.sender);
        }
    }

    function exitMarket(address qToken) external override onlyListedMarket(qToken) onlyMemberOfMarket(qToken) {
        QConstant.AccountSnapshot memory snapshot = IQToken(qToken).accruedAccountSnapshot(msg.sender);
        require(snapshot.borrowBalance == 0, "Qore: borrow balance must be zero");
        require(IQValidator(qValidator).redeemAllowed(qToken, msg.sender, snapshot.qTokenBalance), "Qore: cannot redeem");

        delete usersOfMarket[qToken][msg.sender];
        _removeUserMarket(qToken, msg.sender);
        emit MarketExited(qToken, msg.sender);
    }

    function supply(address qToken, uint uAmount) external override payable onlyListedMarket(qToken) returns (uint) {
        uAmount = IQToken(qToken).underlying() == address(WBNB) ? msg.value : uAmount;

        uint qAmount = IQToken(qToken).supply{value : msg.value}(msg.sender, uAmount);
        qDistributor.notifySupplyUpdated(qToken, msg.sender);

        return qAmount;
    }

    function redeemToken(address qToken, uint qAmount) external override onlyListedMarket(qToken) returns (uint) {
        uint uAmountRedeem = IQToken(qToken).redeemToken(msg.sender, qAmount);
        qDistributor.notifySupplyUpdated(qToken, msg.sender);

        return uAmountRedeem;
    }

    function redeemUnderlying(address qToken, uint uAmount) external override onlyListedMarket(qToken) returns (uint) {
        uint uAmountRedeem = IQToken(qToken).redeemUnderlying(msg.sender, uAmount);
        qDistributor.notifySupplyUpdated(qToken, msg.sender);

        return uAmountRedeem;
    }

    function borrow(address qToken, uint amount) external override onlyListedMarket(qToken) {
        _enterMarket(qToken, msg.sender);
        require(IQValidator(qValidator).borrowAllowed(qToken, msg.sender, amount), "Qore: cannot borrow");

        IQToken(payable(qToken)).borrow(msg.sender, amount);
        qDistributor.notifyBorrowUpdated(qToken, msg.sender);
    }

    function repayBorrow(address qToken, uint amount) external override payable onlyListedMarket(qToken) {
        IQToken(payable(qToken)).repayBorrow{value : msg.value}(msg.sender, amount);
        qDistributor.notifyBorrowUpdated(qToken, msg.sender);
    }

    function repayBorrowBehalf(address qToken, address borrower, uint amount) external override payable onlyListedMarket(qToken) {
        IQToken(payable(qToken)).repayBorrowBehalf{value : msg.value}(msg.sender, borrower, amount);
        qDistributor.notifyBorrowUpdated(qToken, borrower);
    }

    function liquidateBorrow(address qTokenBorrowed, address qTokenCollateral, address borrower, uint amount) external override payable {
        require(marketInfos[qTokenBorrowed].isListed && marketInfos[qTokenCollateral].isListed, "Qore: invalid market");
        require(IQValidator(qValidator).liquidateAllowed(qTokenBorrowed, borrower, amount, closeFactor), "Qore: cannot liquidate borrow");

        uint qAmountToSeize = IQToken(qTokenBorrowed).liquidateBorrow{value : msg.value}(qTokenCollateral, msg.sender, borrower, amount);
        IQToken(qTokenCollateral).seize(msg.sender, borrower, qAmountToSeize);
        qDistributor.notifyBorrowUpdated(qTokenBorrowed, borrower);
    }

    function removeUserFromList(address _account) external onlyKeeper {
        require(marketListOfUsers[_account].length == 0, "Qore: cannot remove user");
        address[] memory updateUserList = new address[](totalUserList.length - 1);

        uint counter = 0;
        for (uint i = 0; i < totalUserList.length; i++) {
            if (totalUserList[i] != _account) {
                updateUserList[counter++] = totalUserList[i];
            }
        }
        totalUserList = updateUserList;
    }

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

    function _enterMarket(address qToken, address _account) internal onlyListedMarket(qToken) {
        if (!usersOfMarket[qToken][_account]) {
            usersOfMarket[qToken][_account] = true;
            if (marketListOfUsers[_account].length == 0) {
                totalUserList.push(_account);
            }
            marketListOfUsers[_account].push(qToken);
            emit MarketEntered(qToken, _account);
        }
    }

    function _removeUserMarket(address qTokenToExit, address _account) private {
        require(marketListOfUsers[_account].length > 0, "Qore: cannot pop user market");

        address[] memory updatedMarkets = new address[](marketListOfUsers[_account].length - 1);
        uint counter = 0;
        for (uint i = 0; i < marketListOfUsers[_account].length; i++) {
            if (marketListOfUsers[_account][i] != qTokenToExit) {
                updatedMarkets[counter++] = marketListOfUsers[_account][i];
            }
        }
        marketListOfUsers[_account] = updatedMarkets;
    }
}

// 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 ^0.6.12;
pragma experimental ABIEncoderV2;

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "../library/QConstant.sol";


interface IQToken {
    function underlying() external view returns (address);
    function totalSupply() external view returns (uint);

    function accountSnapshot(address account) external view returns (QConstant.AccountSnapshot memory);
    function underlyingBalanceOf(address account) external view returns (uint);
    function borrowBalanceOf(address account) external view returns (uint);
    function borrowRatePerSec() external view returns (uint);
    function supplyRatePerSec() external view returns (uint);
    function totalBorrow() external view returns (uint);
    function exchangeRate() external view returns (uint);
    function getCash() external view returns (uint);
    function getAccInterestIndex() external view returns (uint);

    function accruedAccountSnapshot(address account) external returns (QConstant.AccountSnapshot memory);
    function accruedUnderlyingBalanceOf(address account) external returns (uint);
    function accruedBorrowBalanceOf(address account) external returns (uint);
    function accruedTotalBorrow() external returns (uint);
    function accruedExchangeRate() external returns (uint);

    function approve(address spender, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address dst, uint amount) external returns (bool);
    function transferFrom(address src, address dst, uint amount) external returns (bool);

    function supply(address account, uint underlyingAmount) external payable returns (uint);
    function redeemToken(address account, uint qTokenAmount) external returns (uint);
    function redeemUnderlying(address account, uint underlyingAmount) external returns (uint);

    function borrow(address account, uint amount) external returns (uint);
    function repayBorrow(address account, uint amount) external payable returns (uint);
    function repayBorrowBehalf(address payer, address borrower, uint amount) external payable returns (uint);

    function liquidateBorrow(address qTokenCollateral, address liquidator, address borrower, uint amount) payable external returns (uint qAmountToSeize);
    function seize(address liquidator, address borrower, uint qTokenAmount) external;
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/


interface IQValidator {
    function redeemAllowed(address qToken, address redeemer, uint redeemAmount) external returns (bool);
    function borrowAllowed(address qToken, address borrower, uint borrowAmount) external returns (bool);
    function liquidateAllowed(address qTokenBorrowed, address borrower, uint repayAmount, uint closeFactor) external returns (bool);
    function qTokenAmountToSeize(address qTokenBorrowed, address qTokenCollateral, uint actualRepayAmount) external returns (uint qTokenAmount);
    function getAccountLiquidity(address account, address qToken, uint redeemAmount, uint borrowAmount) external view returns (uint liquidity, uint shortfall);
    function getAccountLiquidityValue(address account) external view returns (uint collateralUSD, uint borrowUSD);
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "./interfaces/IQore.sol";
import "./interfaces/IQDistributor.sol";
import "./interfaces/IPriceCalculator.sol";
import "./library/WhitelistUpgradeable.sol";
import {QConstant} from "./library/QConstant.sol";
import "./interfaces/IQToken.sol";


abstract contract QoreAdmin is IQore, WhitelistUpgradeable {

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

    IPriceCalculator public constant priceCalculator = IPriceCalculator(0x20E5E35ba29dC3B540a1aee781D0814D5c77Bce6);

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

    address public keeper;
    address public override qValidator;
    IQDistributor public qDistributor;

    address[] public markets; // qTokenAddress[]
    mapping(address => QConstant.MarketInfo) public marketInfos; // (qTokenAddress => MarketInfo)

    uint public closeFactor;
    uint public override liquidationIncentive;

    /* ========== Event ========== */

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

    event CloseFactorUpdated(uint newCloseFactor);
    event CollateralFactorUpdated(address qToken, uint newCollateralFactor);
    event LiquidationIncentiveUpdated(uint newLiquidationIncentive);
    event BorrowCapUpdated(address indexed qToken, uint newBorrowCap);

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

    modifier onlyKeeper {
        require(msg.sender == keeper || msg.sender == owner(), 'Qore: caller is not the owner or keeper');
        _;
    }

    modifier onlyListedMarket(address qToken) {
        require(marketInfos[qToken].isListed, "Qore: invalid market");
        _;
    }

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

    function __Qore_init() internal initializer {
        __WhitelistUpgradeable_init();

        closeFactor = 5e17;
        liquidationIncentive = 11e17;
    }

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

    function setKeeper(address _keeper) external onlyKeeper {
        require(_keeper != address(0), "Qore: invalid keeper address");
        keeper = _keeper;
    }

    function setQValidator(address _qValidator) external onlyKeeper {
        require(_qValidator != address(0), "Qore: invalid qValidator address");
        qValidator = _qValidator;
    }

    function setQDistributor(address _qDistributor) external onlyKeeper {
        require(_qDistributor != address(0), "Qore: invalid qDistributor address");
        qDistributor = IQDistributor(_qDistributor);
    }

    function setCloseFactor(uint newCloseFactor) external onlyKeeper {
        require(newCloseFactor >= QConstant.CLOSE_FACTOR_MIN && newCloseFactor <= QConstant.CLOSE_FACTOR_MAX, "Qore: invalid close factor");
        closeFactor = newCloseFactor;
        emit CloseFactorUpdated(newCloseFactor);
    }

    function setCollateralFactor(address qToken, uint newCollateralFactor) external onlyKeeper onlyListedMarket(qToken) {
        require(newCollateralFactor <= QConstant.COLLATERAL_FACTOR_MAX, "Qore: invalid collateral factor");
        if (newCollateralFactor != 0 && priceCalculator.getUnderlyingPrice(qToken) == 0) {
            revert("Qore: invalid underlying price");
        }

        marketInfos[qToken].collateralFactor = newCollateralFactor;
        emit CollateralFactorUpdated(qToken, newCollateralFactor);
    }

    function setLiquidationIncentive(uint newLiquidationIncentive) external onlyKeeper {
        liquidationIncentive = newLiquidationIncentive;
        emit LiquidationIncentiveUpdated(newLiquidationIncentive);
    }

    function setMarketBorrowCaps(address[] calldata qTokens, uint[] calldata newBorrowCaps) external onlyKeeper {
        require(qTokens.length != 0 && qTokens.length == newBorrowCaps.length, "Qore: invalid data");

        for (uint i = 0; i < qTokens.length; i++) {
            marketInfos[qTokens[i]].borrowCap = newBorrowCaps[i];
            emit BorrowCapUpdated(qTokens[i], newBorrowCaps[i]);
        }
    }

    function listMarket(address payable qToken, uint borrowCap, uint collateralFactor) external onlyKeeper {
        require(!marketInfos[qToken].isListed, "Qore: already listed market");
        for (uint i = 0; i < markets.length; i ++) {
            require(markets[i] != qToken, "Qore: already listed market");
        }

        marketInfos[qToken] = QConstant.MarketInfo({isListed : true, borrowCap : borrowCap, collateralFactor : collateralFactor});
        markets.push(qToken);
        emit MarketListed(qToken);
    }

    function removeMarket(address payable qToken) external onlyKeeper {
        require(marketInfos[qToken].isListed, "Qore: unlisted market");
        require(IQToken(qToken).totalSupply() == 0 && IQToken(qToken).totalBorrow() == 0, "Qore: cannot remove market");

        address[] memory updatedMarkets = new address[](markets.length - 1);
        uint counter = 0;
        for (uint i = 0; i < markets.length; i++) {
            if (markets[i] != qToken) {
                updatedMarkets[counter++] = markets[i];
            }
        }
        markets = updatedMarkets;
        delete marketInfos[qToken];
    }
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/


library QConstant {
    uint public constant CLOSE_FACTOR_MIN = 5e16;
    uint public constant CLOSE_FACTOR_MAX = 9e17;
    uint public constant COLLATERAL_FACTOR_MAX = 9e17;

    struct MarketInfo {
        bool isListed;
        uint borrowCap;
        uint collateralFactor;
    }

    struct BorrowInfo {
        uint borrow;
        uint interestIndex;
    }

    struct AccountSnapshot {
        uint qTokenBalance;
        uint borrowBalance;
        uint exchangeRate;
    }

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

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

import "../library/QConstant.sol";


interface IQore {
    function qValidator() external view returns (address);
    function getTotalUserList() external view returns (address[] memory);

    function allMarkets() external view returns (address[] memory);
    function marketListOf(address account) external view returns (address[] memory);
    function marketInfoOf(address qToken) external view returns (QConstant.MarketInfo memory);
    function liquidationIncentive() external view returns (uint);
    function checkMembership(address account, address qToken) external view returns (bool);

    function enterMarkets(address[] memory qTokens) external;
    function exitMarket(address qToken) external;

    function supply(address qToken, uint underlyingAmount) external payable returns (uint);
    function redeemToken(address qToken, uint qTokenAmount) external returns (uint);
    function redeemUnderlying(address qToken, uint underlyingAmount) external returns (uint);

    function borrow(address qToken, uint amount) external;

    function repayBorrow(address qToken, uint amount) external payable;
    function repayBorrowBehalf(address qToken, address borrower, uint amount) external payable;

    function liquidateBorrow(address qTokenBorrowed, address qTokenCollateral, address borrower, uint amount) external payable;
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

interface IQDistributor {

    struct UserInfo {
        uint accruedQubit;
        uint boostedSupply;    // effective(boosted) supply balance of user  (since last_action)
        uint boostedBorrow;    // effective(boosted) borrow balance of user  (since last_action)
        uint accPerShareSupply;  // Last integral value of Qubit rewards per share. ∫(qubitRate(t) / totalShare(t) dt) from 0 till (last_action)
        uint accPerShareBorrow;  // Last integral value of Qubit rewards per share. ∫(qubitRate(t) / totalShare(t) dt) from 0 till (last_action)
    }

    struct DistributionInfo {
        uint supplyRate;
        uint borrowRate;
        uint totalBoostedSupply;
        uint totalBoostedBorrow;
        uint accPerShareSupply;
        uint accPerShareBorrow;
        uint accruedAt;
    }

    function accruedQubit(address market, address user) external view returns (uint);
    function qubitRatesOf(address market) external view returns (uint supplyRate, uint borrowRate);
    function totalBoosted(address market) external view returns (uint boostedSupply, uint boostedBorrow);
    function boostedBalanceOf(address market, address account) external view returns (uint boostedSupply, uint boostedBorrow);

    function notifySupplyUpdated(address market, address user) external;
    function notifyBorrowUpdated(address market, address user) external;
    function notifyTransferred(address qToken, address sender, address receiver) external;
    function claimQubit(address user) external;
    function kick(address user) external;
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/


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

    function priceOf(address asset) external view returns (uint);
    function pricesOf(address[] memory assets) external view returns (uint[] memory);
    function getUnderlyingPrice(address qToken) external view returns (uint);
    function getUnderlyingPrices(address[] memory qTokens) external view returns (uint[] memory);
    function valueOfAsset(address asset, uint amount) external view returns (uint valueInBNB, uint valueInUSD);
}

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

/*
      ___       ___       ___       ___       ___
     /\  \     /\__\     /\  \     /\  \     /\  \
    /::\  \   /:/ _/_   /::\  \   _\:\  \    \:\  \
    \:\:\__\ /:/_/\__\ /::\:\__\ /\/::\__\   /::\__\
     \::/  / \:\/:/  / \:\::/  / \::/\/__/  /:/\/__/
     /:/  /   \::/  /   \::/  /   \:\__\    \/__/
     \/__/     \/__/     \/__/     \/__/

*
* MIT License
* ===========
*
* Copyright (c) 2021 QubitFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";


contract WhitelistUpgradeable is OwnableUpgradeable {
    mapping (address => bool) private _whitelist;
    bool private _disable;                      // default - false means whitelist feature is working on. if true no more use of whitelist

    event Whitelisted(address indexed _address, bool whitelist);
    event EnableWhitelist();
    event DisableWhitelist();

    modifier onlyWhitelisted {
        require(_disable || _whitelist[msg.sender], "Whitelist: caller is not on the whitelist");
        _;
    }

    function __WhitelistUpgradeable_init() internal initializer {
        __Ownable_init();
    }

    function isWhitelist(address _address) public view returns(bool) {
        return _whitelist[_address];
    }

    function setWhitelist(address _address, bool _on) external onlyOwner {
        _whitelist[_address] = _on;

        emit Whitelisted(_address, _on);
    }

    function disableWhitelist(bool disable) external onlyOwner {
        _disable = disable;
        if (disable) {
            emit DisableWhitelist();
        } else {
            emit EnableWhitelist();
        }
    }

    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        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;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    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;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;

import "../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

        // 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");
    }

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

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

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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