// File: contracts/protocol/lendingpool/LendingPoolConfigurator.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;

import {SafeMath} from "../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {VersionedInitializable} from "../libraries/aave-upgradeability/VersionedInitializable.sol";
import {InitializableImmutableAdminUpgradeabilityProxy} from "../libraries/aave-upgradeability/InitializableImmutableAdminUpgradeabilityProxy.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {ILendingPoolAddressesProvider} from "../../interfaces/ILendingPoolAddressesProvider.sol";
import {ILendingPool} from "../../interfaces/ILendingPool.sol";
import {IERC20Metadata} from "../../dependencies/openzeppelin/contracts/IERC20Metadata.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {IInitializableDebtToken} from "../../interfaces/IInitializableDebtToken.sol";
import {IInitializableAToken} from "../../interfaces/IInitializableAToken.sol";
import {ILendingPoolConfigurator} from "../../interfaces/ILendingPoolConfigurator.sol";

interface IPhiatFeeDistribution {
    function addReward(address rewardsToken) external;
}

/**
 * @title LendingPoolConfigurator contract
 * @author Aave
 * @dev Implements the configuration methods for the Aave protocol
 **/

contract LendingPoolConfigurator is
    VersionedInitializable,
    ILendingPoolConfigurator
{
    using SafeMath for uint256;
    using PercentageMath for uint256;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;

    ILendingPoolAddressesProvider internal addressesProvider;
    ILendingPool internal pool;

    modifier onlyPoolAdmin() {
        require(
            addressesProvider.getPoolAdmin() == msg.sender,
            Errors.CALLER_NOT_POOL_ADMIN
        );
        _;
    }

    modifier onlyEmergencyAdmin() {
        require(
            addressesProvider.getEmergencyAdmin() == msg.sender,
            Errors.LPC_CALLER_NOT_EMERGENCY_ADMIN
        );
        _;
    }

    uint256 internal constant CONFIGURATOR_REVISION = 0x1;

    function getRevision() internal pure override returns (uint256) {
        return CONFIGURATOR_REVISION;
    }

    function initialize(ILendingPoolAddressesProvider provider)
        public
        initializer
    {
        addressesProvider = provider;
        pool = ILendingPool(addressesProvider.getLendingPool());
    }

    /**
     * @dev Initializes reserves in batch
     **/
    function batchInitReserve(InitReserveInput[] calldata input)
        external
        onlyPoolAdmin
    {
        ILendingPool cachedPool = pool;
        for (uint256 i = 0; i < input.length; i++) {
            _initReserve(cachedPool, input[i]);
        }
    }

    function _initReserve(ILendingPool pool, InitReserveInput calldata input)
        internal
    {
        address aTokenProxyAddress = _initTokenWithProxy(
            input.aTokenImpl,
            abi.encodeWithSelector(
                IInitializableAToken.initialize.selector,
                pool,
                input.treasury,
                input.underlyingAsset,
                input.underlyingAssetDecimals,
                input.aTokenName,
                input.aTokenSymbol,
                input.params
            )
        );
        IPhiatFeeDistribution(input.treasury).addReward(aTokenProxyAddress);

        address stableDebtTokenProxyAddress = _initTokenWithProxy(
            input.stableDebtTokenImpl,
            abi.encodeWithSelector(
                IInitializableDebtToken.initialize.selector,
                pool,
                input.underlyingAsset,
                input.underlyingAssetDecimals,
                input.stableDebtTokenName,
                input.stableDebtTokenSymbol,
                input.params
            )
        );

        address variableDebtTokenProxyAddress = _initTokenWithProxy(
            input.variableDebtTokenImpl,
            abi.encodeWithSelector(
                IInitializableDebtToken.initialize.selector,
                pool,
                input.underlyingAsset,
                input.underlyingAssetDecimals,
                input.variableDebtTokenName,
                input.variableDebtTokenSymbol,
                input.params
            )
        );

        pool.initReserve(
            input.underlyingAsset,
            aTokenProxyAddress,
            stableDebtTokenProxyAddress,
            variableDebtTokenProxyAddress,
            input.interestRateStrategyAddress
        );

        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(input.underlyingAsset);

        currentConfig.setDecimals(input.underlyingAssetDecimals);

        currentConfig.setActive(true);
        currentConfig.setFrozen(false);

        pool.setConfiguration(input.underlyingAsset, currentConfig.data);

        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            input.underlyingAsset
        );
        currentLimits.maxGlobalDepositSize = input.maxGlobalDepositSize;
        currentLimits.maxIndividualDepositSize = input.maxIndividualDepositSize;
        currentLimits.minIndividualDepositSize = input.minIndividualDepositSize;
        currentLimits.maxGlobalBorrowSize = input.maxGlobalBorrowSize;
        currentLimits.maxIndividualBorrowSize = input.maxIndividualBorrowSize;
        currentLimits.maxBorrowBps = input.maxBorrowBps;
        pool.setLimits(input.underlyingAsset, currentLimits);

        emit ReserveInitialized(
            input.underlyingAsset,
            aTokenProxyAddress,
            stableDebtTokenProxyAddress,
            variableDebtTokenProxyAddress,
            input.interestRateStrategyAddress
        );
    }

    /**
     * @dev Updates the aToken implementation for the reserve
     **/
    function updateAToken(UpdateATokenInput calldata input)
        external
        onlyPoolAdmin
    {
        ILendingPool cachedPool = pool;

        DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(
            input.asset
        );

        (, , , uint256 decimals, ) = cachedPool
            .getConfiguration(input.asset)
            .getParamsMemory();

        bytes memory encodedCall = abi.encodeWithSelector(
            IInitializableAToken.initialize.selector,
            cachedPool,
            input.treasury,
            input.asset,
            decimals,
            input.name,
            input.symbol,
            input.params
        );

        _upgradeTokenImplementation(
            reserveData.aTokenAddress,
            input.implementation,
            encodedCall
        );

        emit ATokenUpgraded(
            input.asset,
            reserveData.aTokenAddress,
            input.implementation
        );
    }

    /**
     * @dev Updates the stable debt token implementation for the reserve
     **/
    function updateStableDebtToken(UpdateDebtTokenInput calldata input)
        external
        onlyPoolAdmin
    {
        ILendingPool cachedPool = pool;

        DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(
            input.asset
        );

        (, , , uint256 decimals, ) = cachedPool
            .getConfiguration(input.asset)
            .getParamsMemory();

        bytes memory encodedCall = abi.encodeWithSelector(
            IInitializableDebtToken.initialize.selector,
            cachedPool,
            input.asset,
            decimals,
            input.name,
            input.symbol,
            input.params
        );

        _upgradeTokenImplementation(
            reserveData.stableDebtTokenAddress,
            input.implementation,
            encodedCall
        );

        emit StableDebtTokenUpgraded(
            input.asset,
            reserveData.stableDebtTokenAddress,
            input.implementation
        );
    }

    /**
     * @dev Updates the variable debt token implementation for the asset
     **/
    function updateVariableDebtToken(UpdateDebtTokenInput calldata input)
        external
        onlyPoolAdmin
    {
        ILendingPool cachedPool = pool;

        DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(
            input.asset
        );

        (, , , uint256 decimals, ) = cachedPool
            .getConfiguration(input.asset)
            .getParamsMemory();

        bytes memory encodedCall = abi.encodeWithSelector(
            IInitializableDebtToken.initialize.selector,
            cachedPool,
            input.asset,
            decimals,
            input.name,
            input.symbol,
            input.params
        );

        _upgradeTokenImplementation(
            reserveData.variableDebtTokenAddress,
            input.implementation,
            encodedCall
        );

        emit VariableDebtTokenUpgraded(
            input.asset,
            reserveData.variableDebtTokenAddress,
            input.implementation
        );
    }

    /**
     * @dev Enables borrowing on a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param stableBorrowRateEnabled True if stable borrow rate needs to be enabled by default on this reserve
     **/
    function enableBorrowingOnReserve(
        address asset,
        bool stableBorrowRateEnabled
    ) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setBorrowingEnabled(true);
        currentConfig.setStableRateBorrowingEnabled(stableBorrowRateEnabled);

        pool.setConfiguration(asset, currentConfig.data);

        emit BorrowingEnabledOnReserve(asset, stableBorrowRateEnabled);
    }

    /**
     * @dev Disables borrowing on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function disableBorrowingOnReserve(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setBorrowingEnabled(false);

        pool.setConfiguration(asset, currentConfig.data);
        emit BorrowingDisabledOnReserve(asset);
    }

    /**
     * @dev Configures the reserve collateralization parameters
     * all the values are expressed in percentages with two decimals of precision. A valid value is 10000, which means 100.00%
     * @param asset The address of the underlying asset of the reserve
     * @param ltv The loan to value of the asset when used as collateral
     * @param liquidationThreshold The threshold at which loans using this asset as collateral will be considered undercollateralized
     * @param liquidationBonus The bonus liquidators receive to liquidate this asset. The values is always above 100%. A value of 105%
     * means the liquidator will receive a 5% bonus
     **/
    function configureReserveAsCollateral(
        address asset,
        uint256 ltv,
        uint256 liquidationThreshold,
        uint256 liquidationBonus
    ) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        //validation of the parameters: the LTV can
        //only be lower or equal than the liquidation threshold
        //(otherwise a loan against the asset would cause instantaneous liquidation)
        require(ltv <= liquidationThreshold, Errors.LPC_INVALID_CONFIGURATION);

        if (liquidationThreshold != 0) {
            //liquidation bonus must be bigger than 100.00%, otherwise the liquidator would receive less
            //collateral than needed to cover the debt
            require(
                liquidationBonus > PercentageMath.PERCENTAGE_FACTOR,
                Errors.LPC_INVALID_CONFIGURATION
            );

            //if threshold * bonus is less than PERCENTAGE_FACTOR, it's guaranteed that at the moment
            //a loan is taken there is enough collateral available to cover the liquidation bonus
            require(
                liquidationThreshold.percentMul(liquidationBonus) <=
                    PercentageMath.PERCENTAGE_FACTOR,
                Errors.LPC_INVALID_CONFIGURATION
            );
        } else {
            require(liquidationBonus == 0, Errors.LPC_INVALID_CONFIGURATION);
            //if the liquidation threshold is being set to 0,
            // the reserve is being disabled as collateral. To do so,
            //we need to ensure no liquidity is deposited
            _checkNoLiquidity(asset);
        }

        currentConfig.setLtv(ltv);
        currentConfig.setLiquidationThreshold(liquidationThreshold);
        currentConfig.setLiquidationBonus(liquidationBonus);

        pool.setConfiguration(asset, currentConfig.data);

        emit CollateralConfigurationChanged(
            asset,
            ltv,
            liquidationThreshold,
            liquidationBonus
        );
    }

    /**
     * @dev Enable stable rate borrowing on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function enableReserveStableRate(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setStableRateBorrowingEnabled(true);

        pool.setConfiguration(asset, currentConfig.data);

        emit StableRateEnabledOnReserve(asset);
    }

    /**
     * @dev Disable stable rate borrowing on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function disableReserveStableRate(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setStableRateBorrowingEnabled(false);

        pool.setConfiguration(asset, currentConfig.data);

        emit StableRateDisabledOnReserve(asset);
    }

    /**
     * @dev Activates a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function activateReserve(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setActive(true);

        pool.setConfiguration(asset, currentConfig.data);

        emit ReserveActivated(asset);
    }

    /**
     * @dev Deactivates a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function deactivateReserve(address asset) external onlyPoolAdmin {
        _checkNoLiquidity(asset);

        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setActive(false);

        pool.setConfiguration(asset, currentConfig.data);

        emit ReserveDeactivated(asset);
    }

    /**
     * @dev Freezes a reserve. A frozen reserve doesn't allow any new deposit, borrow or rate swap
     *  but allows repayments, liquidations, rate rebalances and withdrawals
     * @param asset The address of the underlying asset of the reserve
     **/
    function freezeReserve(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setFrozen(true);

        pool.setConfiguration(asset, currentConfig.data);

        emit ReserveFrozen(asset);
    }

    /**
     * @dev Unfreezes a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    function unfreezeReserve(address asset) external onlyPoolAdmin {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setFrozen(false);

        pool.setConfiguration(asset, currentConfig.data);

        emit ReserveUnfrozen(asset);
    }

    /**
     * @dev Updates the reserve factor of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param reserveFactor The new reserve factor of the reserve
     **/
    function setReserveFactor(address asset, uint256 reserveFactor)
        external
        onlyPoolAdmin
    {
        DataTypes.ReserveConfigurationMap memory currentConfig = pool
            .getConfiguration(asset);

        currentConfig.setReserveFactor(reserveFactor);

        pool.setConfiguration(asset, currentConfig.data);

        emit ReserveFactorChanged(asset, reserveFactor);
    }

    /**
     * @dev Sets the interest rate strategy of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param rateStrategyAddress The new address of the interest strategy contract
     **/
    function setReserveInterestRateStrategyAddress(
        address asset,
        address rateStrategyAddress
    ) external onlyPoolAdmin {
        pool.setReserveInterestRateStrategyAddress(asset, rateStrategyAddress);
        emit ReserveInterestRateStrategyChanged(asset, rateStrategyAddress);
    }

    /**
     * @dev Updates the maximum global deposit size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalDepositSize The new maximum global deposit size of the reserve
     **/
    function setMaxGlobalDepositSize(
        address asset,
        uint256 maxGlobalDepositSize
    ) external override onlyPoolAdmin {
        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.maxGlobalDepositSize = maxGlobalDepositSize;

        pool.setLimits(asset, currentLimits);

        emit ReserveMaxGlobalDepositSizeChanged(asset, maxGlobalDepositSize);
    }

    /**
     * @dev Updates the maximum individual deposit size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualDepositSize The new maximum individual deposit size of the reserve
     **/
    function setMaxIndividualDepositSize(
        address asset,
        uint256 maxIndividualDepositSize
    ) external override onlyPoolAdmin {
        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.maxIndividualDepositSize = maxIndividualDepositSize;

        pool.setLimits(asset, currentLimits);

        emit ReserveMaxIndividualDepositSizeChanged(
            asset,
            maxIndividualDepositSize
        );
    }

    /**
     * @dev Updates the minimum individual deposit size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param minIndividualDepositSize The new minimum individual deposit size of the reserve
     **/
    function setMinIndividualDepositSize(
        address asset,
        uint256 minIndividualDepositSize
    ) external onlyPoolAdmin {
        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.minIndividualDepositSize = minIndividualDepositSize;

        pool.setLimits(asset, currentLimits);

        emit ReserveMinIndividualDepositSizeChanged(
            asset,
            minIndividualDepositSize
        );
    }

    /**
     * @dev Updates the maximum global borrow size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalBorrowSize The new maximum global borrow size of the reserve
     **/
    function setMaxGlobalBorrowSize(address asset, uint256 maxGlobalBorrowSize)
        external
        override
        onlyPoolAdmin
    {
        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.maxGlobalBorrowSize = maxGlobalBorrowSize;

        pool.setLimits(asset, currentLimits);

        emit ReserveMaxGlobalBorrowSizeChanged(asset, maxGlobalBorrowSize);
    }

    /**
     * @dev Updates the maximum individual borrow size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualBorrowSize The new maximum individual borrow size of the reserve
     **/
    function setMaxIndividualBorrowSize(
        address asset,
        uint256 maxIndividualBorrowSize
    ) external override onlyPoolAdmin {
        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.maxIndividualBorrowSize = maxIndividualBorrowSize;

        pool.setLimits(asset, currentLimits);

        emit ReserveMaxIndividualBorrowSizeChanged(
            asset,
            maxIndividualBorrowSize
        );
    }

    /**
     * @dev Updates the maximum borrow bps of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxBorrowBps The new maximum borrow bps of the reserve
     **/
    function setMaxBorrowBps(address asset, uint256 maxBorrowBps)
        external
        onlyPoolAdmin
    {
        require(
            maxBorrowBps <= 10000,
            Errors.AVL_INVALID_BORROW_MAX_PERCENTAGE
        );

        DataTypes.ReserveLimits memory currentLimits = pool.getReserveLimits(
            asset
        );

        currentLimits.maxBorrowBps = maxBorrowBps;

        pool.setLimits(asset, currentLimits);

        emit ReserveMaxBorrowBpsChanged(asset, maxBorrowBps);
    }

    /**
     * @dev pauses or unpauses all the actions of the protocol, including aToken transfers
     * @param val true if protocol needs to be paused, false otherwise
     **/
    function setPoolPause(bool val) external onlyEmergencyAdmin {
        pool.setPause(val);
    }

    function _initTokenWithProxy(
        address implementation,
        bytes memory initParams
    ) internal returns (address) {
        InitializableImmutableAdminUpgradeabilityProxy proxy = new InitializableImmutableAdminUpgradeabilityProxy(
                address(this)
            );

        proxy.initialize(implementation, initParams);

        return address(proxy);
    }

    function _upgradeTokenImplementation(
        address proxyAddress,
        address implementation,
        bytes memory initParams
    ) internal {
        InitializableImmutableAdminUpgradeabilityProxy proxy = InitializableImmutableAdminUpgradeabilityProxy(
                payable(proxyAddress)
            );

        proxy.upgradeToAndCall(implementation, initParams);
    }

    function _checkNoLiquidity(address asset) internal view {
        DataTypes.ReserveData memory reserveData = pool.getReserveData(asset);

        uint256 availableLiquidity = IERC20Metadata(asset).balanceOf(
            reserveData.aTokenAddress
        );

        require(
            availableLiquidity == 0 && reserveData.currentLiquidityRate == 0,
            Errors.LPC_RESERVE_LIQUIDITY_NOT_0
        );
    }
}

// File: contracts/dependencies/openzeppelin/contracts/SafeMath.sol



// 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;
    }
}

// File: contracts/protocol/libraries/aave-upgradeability/VersionedInitializable.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title VersionedInitializable
 *
 * @dev Helper contract to implement initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 *
 * @author Aave, inspired by the OpenZeppelin Initializable contract
 */
abstract contract VersionedInitializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    uint256 private lastInitializedRevision = 0;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private initializing;

    /**
     * @dev Modifier to use in the initializer function of a contract.
     */
    modifier initializer() {
        uint256 revision = getRevision();
        require(
            initializing ||
                isConstructor() ||
                revision > lastInitializedRevision,
            "Contract instance has already been initialized"
        );

        bool isTopLevelCall = !initializing;
        if (isTopLevelCall) {
            initializing = true;
            lastInitializedRevision = revision;
        }

        _;

        if (isTopLevelCall) {
            initializing = false;
        }
    }

    /**
     * @dev returns the revision number of the contract
     * Needs to be defined in the inherited class as a constant.
     **/
    function getRevision() internal pure virtual returns (uint256);

    /**
     * @dev Returns true if and only if the function is running in the constructor
     **/
    function isConstructor() private view returns (bool) {
        // extcodesize checks the size of the code stored in an address, and
        // address returns the current address. Since the code is still not
        // deployed when running a constructor, any checks on its code size will
        // yield zero, making it an effective way to detect if a contract is
        // under construction or not.
        uint256 cs;
        //solium-disable-next-line
        assembly {
            cs := extcodesize(address())
        }
        return cs == 0;
    }

    // Reserved storage space to allow for layout changes in the future.
    uint256[50] private ______gap;
}

// File: contracts/protocol/libraries/aave-upgradeability/InitializableImmutableAdminUpgradeabilityProxy.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import "./BaseImmutableAdminUpgradeabilityProxy.sol";
import "../../../dependencies/openzeppelin/upgradeability/InitializableUpgradeabilityProxy.sol";

/**
 * @title InitializableAdminUpgradeabilityProxy
 * @dev Extends BaseAdminUpgradeabilityProxy with an initializer function
 */
contract InitializableImmutableAdminUpgradeabilityProxy is
    BaseImmutableAdminUpgradeabilityProxy,
    InitializableUpgradeabilityProxy
{
    constructor(address admin) BaseImmutableAdminUpgradeabilityProxy(admin) {}

    /**
     * @dev Only fall back when the sender is not the admin.
     */
    function _willFallback()
        internal
        override(BaseImmutableAdminUpgradeabilityProxy, Proxy)
    {
        BaseImmutableAdminUpgradeabilityProxy._willFallback();
    }
}

// File: contracts/protocol/libraries/configuration/ReserveConfiguration.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title ReserveConfiguration library
 * @author Aave
 * @notice Implements the bitmap logic to handle the reserve configuration
 */
library ReserveConfiguration {
    uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
    uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
    uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
    uint256 constant DECIMALS_MASK =              0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
    uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
    uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
    uint256 constant BORROWING_MASK =             0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
    uint256 constant STABLE_BORROWING_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore
    uint256 constant RESERVE_FACTOR_MASK =        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore

    /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
    uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
    uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
    uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
    uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
    uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
    uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
    uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59;
    uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;

    uint256 constant MAX_VALID_LTV = 65535;
    uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
    uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
    uint256 constant MAX_VALID_DECIMALS = 255;
    uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;

    /**
     * @dev Sets the Loan to Value of the reserve
     * @param self The reserve configuration
     * @param ltv the new ltv
     **/
    function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv)
        internal
        pure
    {
        require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);

        self.data = (self.data & LTV_MASK) | ltv;
    }

    /**
     * @dev Gets the Loan to Value of the reserve
     * @param self The reserve configuration
     * @return The loan to value
     **/
    function getLtv(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (uint256)
    {
        return self.data & ~LTV_MASK;
    }

    /**
     * @dev Sets the liquidation threshold of the reserve
     * @param self The reserve configuration
     * @param threshold The new liquidation threshold
     **/
    function setLiquidationThreshold(
        DataTypes.ReserveConfigurationMap memory self,
        uint256 threshold
    ) internal pure {
        require(
            threshold <= MAX_VALID_LIQUIDATION_THRESHOLD,
            Errors.RC_INVALID_LIQ_THRESHOLD
        );

        self.data =
            (self.data & LIQUIDATION_THRESHOLD_MASK) |
            (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
    }

    /**
     * @dev Gets the liquidation threshold of the reserve
     * @param self The reserve configuration
     * @return The liquidation threshold
     **/
    function getLiquidationThreshold(
        DataTypes.ReserveConfigurationMap storage self
    ) internal view returns (uint256) {
        return
            (self.data & ~LIQUIDATION_THRESHOLD_MASK) >>
            LIQUIDATION_THRESHOLD_START_BIT_POSITION;
    }

    /**
     * @dev Sets the liquidation bonus of the reserve
     * @param self The reserve configuration
     * @param bonus The new liquidation bonus
     **/
    function setLiquidationBonus(
        DataTypes.ReserveConfigurationMap memory self,
        uint256 bonus
    ) internal pure {
        require(
            bonus <= MAX_VALID_LIQUIDATION_BONUS,
            Errors.RC_INVALID_LIQ_BONUS
        );

        self.data =
            (self.data & LIQUIDATION_BONUS_MASK) |
            (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
    }

    /**
     * @dev Gets the liquidation bonus of the reserve
     * @param self The reserve configuration
     * @return The liquidation bonus
     **/
    function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (uint256)
    {
        return
            (self.data & ~LIQUIDATION_BONUS_MASK) >>
            LIQUIDATION_BONUS_START_BIT_POSITION;
    }

    /**
     * @dev Sets the decimals of the underlying asset of the reserve
     * @param self The reserve configuration
     * @param decimals The decimals
     **/
    function setDecimals(
        DataTypes.ReserveConfigurationMap memory self,
        uint256 decimals
    ) internal pure {
        require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);

        self.data =
            (self.data & DECIMALS_MASK) |
            (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
    }

    /**
     * @dev Gets the decimals of the underlying asset of the reserve
     * @param self The reserve configuration
     * @return The decimals of the asset
     **/
    function getDecimals(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (uint256)
    {
        return
            (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
    }

    /**
     * @dev Sets the active state of the reserve
     * @param self The reserve configuration
     * @param active The active state
     **/
    function setActive(
        DataTypes.ReserveConfigurationMap memory self,
        bool active
    ) internal pure {
        self.data =
            (self.data & ACTIVE_MASK) |
            (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
    }

    /**
     * @dev Gets the active state of the reserve
     * @param self The reserve configuration
     * @return The active state
     **/
    function getActive(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (bool)
    {
        return (self.data & ~ACTIVE_MASK) != 0;
    }

    /**
     * @dev Sets the frozen state of the reserve
     * @param self The reserve configuration
     * @param frozen The frozen state
     **/
    function setFrozen(
        DataTypes.ReserveConfigurationMap memory self,
        bool frozen
    ) internal pure {
        self.data =
            (self.data & FROZEN_MASK) |
            (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
    }

    /**
     * @dev Gets the frozen state of the reserve
     * @param self The reserve configuration
     * @return The frozen state
     **/
    function getFrozen(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (bool)
    {
        return (self.data & ~FROZEN_MASK) != 0;
    }

    /**
     * @dev Enables or disables borrowing on the reserve
     * @param self The reserve configuration
     * @param enabled True if the borrowing needs to be enabled, false otherwise
     **/
    function setBorrowingEnabled(
        DataTypes.ReserveConfigurationMap memory self,
        bool enabled
    ) internal pure {
        self.data =
            (self.data & BORROWING_MASK) |
            (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
    }

    /**
     * @dev Gets the borrowing state of the reserve
     * @param self The reserve configuration
     * @return The borrowing state
     **/
    function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (bool)
    {
        return (self.data & ~BORROWING_MASK) != 0;
    }

    /**
     * @dev Enables or disables stable rate borrowing on the reserve
     * @param self The reserve configuration
     * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise
     **/
    function setStableRateBorrowingEnabled(
        DataTypes.ReserveConfigurationMap memory self,
        bool enabled
    ) internal pure {
        self.data =
            (self.data & STABLE_BORROWING_MASK) |
            (uint256(enabled ? 1 : 0) <<
                STABLE_BORROWING_ENABLED_START_BIT_POSITION);
    }

    /**
     * @dev Gets the stable rate borrowing state of the reserve
     * @param self The reserve configuration
     * @return The stable rate borrowing state
     **/
    function getStableRateBorrowingEnabled(
        DataTypes.ReserveConfigurationMap storage self
    ) internal view returns (bool) {
        return (self.data & ~STABLE_BORROWING_MASK) != 0;
    }

    /**
     * @dev Sets the reserve factor of the reserve
     * @param self The reserve configuration
     * @param reserveFactor The reserve factor
     **/
    function setReserveFactor(
        DataTypes.ReserveConfigurationMap memory self,
        uint256 reserveFactor
    ) internal pure {
        require(
            reserveFactor <= MAX_VALID_RESERVE_FACTOR,
            Errors.RC_INVALID_RESERVE_FACTOR
        );

        self.data =
            (self.data & RESERVE_FACTOR_MASK) |
            (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
    }

    /**
     * @dev Gets the reserve factor of the reserve
     * @param self The reserve configuration
     * @return The reserve factor
     **/
    function getReserveFactor(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (uint256)
    {
        return
            (self.data & ~RESERVE_FACTOR_MASK) >>
            RESERVE_FACTOR_START_BIT_POSITION;
    }

    /**
     * @dev Gets the configuration flags of the reserve
     * @param self The reserve configuration
     * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
     **/
    function getFlags(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (
            bool,
            bool,
            bool,
            bool
        )
    {
        uint256 dataLocal = self.data;

        return (
            (dataLocal & ~ACTIVE_MASK) != 0,
            (dataLocal & ~FROZEN_MASK) != 0,
            (dataLocal & ~BORROWING_MASK) != 0,
            (dataLocal & ~STABLE_BORROWING_MASK) != 0
        );
    }

    /**
     * @dev Gets the configuration paramters of the reserve
     * @param self The reserve configuration
     * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
     **/
    function getParams(DataTypes.ReserveConfigurationMap storage self)
        internal
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        uint256 dataLocal = self.data;

        return (
            dataLocal & ~LTV_MASK,
            (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >>
                LIQUIDATION_THRESHOLD_START_BIT_POSITION,
            (dataLocal & ~LIQUIDATION_BONUS_MASK) >>
                LIQUIDATION_BONUS_START_BIT_POSITION,
            (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
            (dataLocal & ~RESERVE_FACTOR_MASK) >>
                RESERVE_FACTOR_START_BIT_POSITION
        );
    }

    /**
     * @dev Gets the configuration paramters of the reserve from a memory object
     * @param self The reserve configuration
     * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
     **/
    function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
        internal
        pure
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        return (
            self.data & ~LTV_MASK,
            (self.data & ~LIQUIDATION_THRESHOLD_MASK) >>
                LIQUIDATION_THRESHOLD_START_BIT_POSITION,
            (self.data & ~LIQUIDATION_BONUS_MASK) >>
                LIQUIDATION_BONUS_START_BIT_POSITION,
            (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
            (self.data & ~RESERVE_FACTOR_MASK) >>
                RESERVE_FACTOR_START_BIT_POSITION
        );
    }

    /**
     * @dev Gets the configuration flags of the reserve from a memory object
     * @param self The reserve configuration
     * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
     **/
    function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
        internal
        pure
        returns (
            bool,
            bool,
            bool,
            bool
        )
    {
        return (
            (self.data & ~ACTIVE_MASK) != 0,
            (self.data & ~FROZEN_MASK) != 0,
            (self.data & ~BORROWING_MASK) != 0,
            (self.data & ~STABLE_BORROWING_MASK) != 0
        );
    }
}

// File: contracts/interfaces/ILendingPoolAddressesProvider.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title LendingPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Aave Governance
 * @author Aave
 **/
interface ILendingPoolAddressesProvider {
    event MarketIdSet(string newMarketId);
    event LendingPoolUpdated(address indexed newAddress);
    event ConfigurationAdminUpdated(address indexed newAddress);
    event EmergencyAdminUpdated(address indexed newAddress);
    event LendingPoolConfiguratorUpdated(address indexed newAddress);
    event LendingPoolCollateralManagerUpdated(address indexed newAddress);
    event PriceOracleUpdated(address indexed newAddress);
    event LendingRateOracleUpdated(address indexed newAddress);
    event IncentivesControllerUpdated(address indexed newAddress);
    event ProxyCreated(bytes32 id, address indexed newAddress);
    event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);

    function getMarketId() external view returns (string memory);

    function setMarketId(string calldata marketId) external;

    function setAddress(bytes32 id, address newAddress) external;

    function setAddressAsProxy(bytes32 id, address impl) external;

    function getAddress(bytes32 id) external view returns (address);

    function getLendingPool() external view returns (address);

    function setLendingPoolImpl(address pool) external;

    function getLendingPoolConfigurator() external view returns (address);

    function setLendingPoolConfiguratorImpl(address configurator) external;

    function getLendingPoolCollateralManager() external view returns (address);

    function setLendingPoolCollateralManager(address manager) external;

    function getPoolAdmin() external view returns (address);

    function setPoolAdmin(address admin) external;

    function getEmergencyAdmin() external view returns (address);

    function setEmergencyAdmin(address admin) external;

    function getPriceOracle() external view returns (address);

    function setPriceOracle(address priceOracle) external;

    function getLendingRateOracle() external view returns (address);

    function setLendingRateOracle(address lendingRateOracle) external;

    function getIncentivesController() external view returns (address);

    function setIncentivesController(address lendingRateOracle) external;
}

// File: contracts/interfaces/ILendingPool.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;

import {ILendingPoolAddressesProvider} from "./ILendingPoolAddressesProvider.sol";
import {DataTypes} from "../protocol/libraries/types/DataTypes.sol";

interface ILendingPool {
    /**
     * @dev Emitted on deposit()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The address initiating the deposit
     * @param onBehalfOf The beneficiary of the deposit, receiving the aTokens
     * @param amount The amount deposited
     * @param referral The referral code used
     **/
    event Deposit(
        address indexed reserve,
        address user,
        address indexed onBehalfOf,
        uint256 amount,
        uint16 indexed referral
    );

    /**
     * @dev Emitted on withdraw()
     * @param reserve The address of the underlyng asset being withdrawn
     * @param user The address initiating the withdrawal, owner of aTokens
     * @param to Address that will receive the underlying
     * @param amount The amount to be withdrawn
     **/
    event Withdraw(
        address indexed reserve,
        address indexed user,
        address indexed to,
        uint256 amount
    );

    /**
     * @dev Emitted on borrow() and flashLoan() when debt needs to be opened
     * @param reserve The address of the underlying asset being borrowed
     * @param user The address of the user initiating the borrow(), receiving the funds on borrow() or just
     * initiator of the transaction on flashLoan()
     * @param onBehalfOf The address that will be getting the debt
     * @param amount The amount borrowed out
     * @param borrowRateMode The rate mode: 1 for Stable, 2 for Variable
     * @param borrowRate The numeric rate at which the user has borrowed
     * @param referral The referral code used
     **/
    event Borrow(
        address indexed reserve,
        address user,
        address indexed onBehalfOf,
        uint256 amount,
        uint256 borrowRateMode,
        uint256 borrowRate,
        uint16 indexed referral
    );

    /**
     * @dev Emitted on repay()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The beneficiary of the repayment, getting his debt reduced
     * @param repayer The address of the user initiating the repay(), providing the funds
     * @param amount The amount repaid
     **/
    event Repay(
        address indexed reserve,
        address indexed user,
        address indexed repayer,
        uint256 amount
    );

    /**
     * @dev Emitted on swapBorrowRateMode()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The address of the user swapping his rate mode
     * @param rateMode The rate mode that the user wants to swap to
     **/
    event Swap(address indexed reserve, address indexed user, uint256 rateMode);

    /**
     * @dev Emitted on setUserUseReserveAsCollateral()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The address of the user enabling the usage as collateral
     **/
    event ReserveUsedAsCollateralEnabled(
        address indexed reserve,
        address indexed user
    );

    /**
     * @dev Emitted on setUserUseReserveAsCollateral()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The address of the user enabling the usage as collateral
     **/
    event ReserveUsedAsCollateralDisabled(
        address indexed reserve,
        address indexed user
    );

    /**
     * @dev Emitted on rebalanceStableBorrowRate()
     * @param reserve The address of the underlying asset of the reserve
     * @param user The address of the user for which the rebalance has been executed
     **/
    event RebalanceStableBorrowRate(
        address indexed reserve,
        address indexed user
    );

    /**
     * @dev Emitted on flashLoan()
     * @param target The address of the flash loan receiver contract
     * @param initiator The address initiating the flash loan
     * @param asset The address of the asset being flash borrowed
     * @param amount The amount flash borrowed
     * @param premium The fee flash borrowed
     * @param referralCode The referral code used
     **/
    event FlashLoan(
        address indexed target,
        address indexed initiator,
        address indexed asset,
        uint256 amount,
        uint256 premium,
        uint16 referralCode
    );

    /**
     * @dev Emitted when the pause is triggered.
     */
    event Paused();

    /**
     * @dev Emitted when the pause is lifted.
     */
    event Unpaused();

    /**
     * @dev Emitted when a borrower is liquidated. This event is emitted by the LendingPool via
     * LendingPoolCollateral manager using a DELEGATECALL
     * This allows to have the events in the generated ABI for LendingPool.
     * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
     * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
     * @param user The address of the borrower getting liquidated
     * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
     * @param liquidatedCollateralAmount The amount of collateral received by the liiquidator
     * @param liquidator The address of the liquidator
     * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
     * to receive the underlying collateral asset directly
     **/
    event LiquidationCall(
        address indexed collateralAsset,
        address indexed debtAsset,
        address indexed user,
        uint256 debtToCover,
        uint256 liquidatedCollateralAmount,
        address liquidator,
        bool receiveAToken
    );

    /**
     * @dev Emitted when a borrower is blacklisted.
     * @param user The address of the borrower getting liquidated
     **/
    event Blacklist(address indexed user);

    /**
     * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
     * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
     * the event will actually be fired by the LendingPool contract. The event is therefore replicated here so it
     * gets added to the LendingPool ABI
     * @param reserve The address of the underlying asset of the reserve
     * @param liquidityRate The new liquidity rate
     * @param stableBorrowRate The new stable borrow rate
     * @param variableBorrowRate The new variable borrow rate
     * @param liquidityIndex The new liquidity index
     * @param variableBorrowIndex The new variable borrow index
     **/
    event ReserveDataUpdated(
        address indexed reserve,
        uint256 liquidityRate,
        uint256 stableBorrowRate,
        uint256 variableBorrowRate,
        uint256 liquidityIndex,
        uint256 variableBorrowIndex
    );

    function isBlacklisted(address user) external returns (bool);

    /**
     * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying aTokens.
     * - E.g. User deposits 100 USDC and gets in return 100 aUSDC
     * @param asset The address of the underlying asset to deposit
     * @param amount The amount to be deposited
     * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
     *   wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
     *   is a different wallet
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without any middle-man
     **/
    function deposit(
        address asset,
        uint256 amount,
        address onBehalfOf,
        uint16 referralCode
    ) external;

    /**
     * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned
     * E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC
     * @param asset The address of the underlying asset to withdraw
     * @param amount The underlying amount to be withdrawn
     *   - Send the value type(uint256).max in order to withdraw the whole aToken balance
     * @param to Address that will receive the underlying, same as msg.sender if the user
     *   wants to receive it on his own wallet, or a different address if the beneficiary is a
     *   different wallet
     * @return The final amount withdrawn
     **/
    function withdraw(
        address asset,
        uint256 amount,
        address to
    ) external returns (uint256);

    /**
     * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
     * already deposited enough collateral, or he was given enough allowance by a credit delegator on the
     * corresponding debt token (StableDebtToken or VariableDebtToken)
     * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
     *   and 100 stable/variable debt tokens, depending on the `interestRateMode`
     * @param asset The address of the underlying asset to borrow
     * @param amount The amount to be borrowed
     * @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without any middle-man
     * @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself
     * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
     * if he has been given credit delegation allowance
     **/
    function borrow(
        address asset,
        uint256 amount,
        uint256 interestRateMode,
        uint16 referralCode,
        address onBehalfOf
    ) external;

    /**
     * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
     * - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address
     * @param asset The address of the borrowed underlying asset previously borrowed
     * @param amount The amount to repay
     * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
     * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
     * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
     * user calling the function if he wants to reduce/remove his own debt, or the address of any other
     * other borrower whose debt should be removed
     * @return The final amount repaid
     **/
    function repay(
        address asset,
        uint256 amount,
        uint256 rateMode,
        address onBehalfOf
    ) external returns (uint256);

    /**
     * @notice Repay all debts of the user and blacklist that user.
     * @param user Address of the user who will get his debt removed. Should be the address of the
     * user calling the function if he wants to reduce/remove his own debt, or the address of any other
     * other borrower whose debt should be removed
     **/
    function repayAllAndBlacklist(address user) external;

    /**
     * @dev Allows a borrower to swap his debt between stable and variable mode, or viceversa
     * @param asset The address of the underlying asset borrowed
     * @param rateMode The rate mode that the user wants to swap to
     **/
    function swapBorrowRateMode(address asset, uint256 rateMode) external;

    /**
     * @dev Rebalances the stable interest rate of a user to the current stable rate defined on the reserve.
     * - Users can be rebalanced if the following conditions are satisfied:
     *     1. Usage ratio is above 95%
     *     2. the current deposit APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too much has been
     *        borrowed at a stable rate and depositors are not earning enough
     * @param asset The address of the underlying asset borrowed
     * @param user The address of the user to be rebalanced
     **/
    function rebalanceStableBorrowRate(address asset, address user) external;

    /**
     * @dev Allows depositors to enable/disable a specific deposited asset as collateral
     * @param asset The address of the underlying asset deposited
     * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
     **/
    function setUserUseReserveAsCollateral(address asset, bool useAsCollateral)
        external;

    /**
     * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
     * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
     *   a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
     * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
     * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
     * @param user The address of the borrower getting liquidated
     * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
     * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
     * to receive the underlying collateral asset directly
     **/
    function liquidationCall(
        address collateralAsset,
        address debtAsset,
        address user,
        uint256 debtToCover,
        bool receiveAToken
    ) external;

    /**
     * @dev Allows smartcontracts to access the liquidity of the pool within one transaction,
     * as long as the amount taken plus a fee is returned.
     * IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept into consideration.
     * For further details please visit https://developers.aave.com
     * @param receiverAddress The address of the contract receiving the funds, implementing the IFlashLoanReceiver interface
     * @param assets The addresses of the assets being flash-borrowed
     * @param amounts The amounts amounts being flash-borrowed
     * @param params Variadic packed params to pass to the receiver as extra information
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without any middle-man
     **/
    function flashLoan(
        address receiverAddress,
        address[] calldata assets,
        uint256[] calldata amounts,
        bytes calldata params,
        uint16 referralCode
    ) external;

    /**
     * @dev Returns the user account data across all the reserves
     * @param user The address of the user
     * @return totalCollateralETH the total collateral in ETH of the user
     * @return totalDebtETH the total debt in ETH of the user
     * @return availableBorrowsETH the borrowing power left of the user
     * @return currentLiquidationThreshold the liquidation threshold of the user
     * @return ltv the loan to value of the user
     * @return healthFactor the current health factor of the user
     **/
    function getUserAccountData(address user)
        external
        view
        returns (
            uint256 totalCollateralETH,
            uint256 totalDebtETH,
            uint256 availableBorrowsETH,
            uint256 currentLiquidationThreshold,
            uint256 ltv,
            uint256 healthFactor
        );

    function initReserve(
        address reserve,
        address aTokenAddress,
        address stableDebtAddress,
        address variableDebtAddress,
        address interestRateStrategyAddress
    ) external;

    function setReserveInterestRateStrategyAddress(
        address reserve,
        address rateStrategyAddress
    ) external;

    function setConfiguration(address reserve, uint256 configuration) external;

    function setLimits(
        address reserve,
        DataTypes.ReserveLimits calldata reserveLimits
    ) external;

    /**
     * @dev Returns the configuration of the reserve
     * @param asset The address of the underlying asset of the reserve
     * @return The configuration of the reserve
     **/
    function getConfiguration(address asset)
        external
        view
        returns (DataTypes.ReserveConfigurationMap memory);

    /**
     * @dev Returns the configuration of the user across all the reserves
     * @param user The user address
     * @return The configuration of the user
     **/
    function getUserConfiguration(address user)
        external
        view
        returns (DataTypes.UserConfigurationMap memory);

    /**
     * @dev Returns the normalized income normalized income of the reserve
     * @param asset The address of the underlying asset of the reserve
     * @return The reserve's normalized income
     */
    function getReserveNormalizedIncome(address asset)
        external
        view
        returns (uint256);

    /**
     * @dev Returns the normalized variable debt per unit of asset
     * @param asset The address of the underlying asset of the reserve
     * @return The reserve normalized variable debt
     */
    function getReserveNormalizedVariableDebt(address asset)
        external
        view
        returns (uint256);

    /**
     * @dev Returns the state and configuration of the reserve
     * @param asset The address of the underlying asset of the reserve
     * @return The state of the reserve
     **/
    function getReserveData(address asset)
        external
        view
        returns (DataTypes.ReserveData memory);

    /**
     * @dev Returns the limits of the reserve
     * @param asset The address of the underlying asset of the reserve
     * @return The limits of the reserve
     **/
    function getReserveLimits(address asset)
        external
        view
        returns (DataTypes.ReserveLimits memory);

    function finalizeTransfer(
        address asset,
        address from,
        address to,
        uint256 amount,
        uint256 balanceFromAfter,
        uint256 balanceToBefore
    ) external;

    function getReservesList() external view returns (address[] memory);

    function getAddressesProvider()
        external
        view
        returns (ILendingPoolAddressesProvider);

    function setPause(bool val) external;

    function paused() external view returns (bool);

    function FLASHLOAN_PREMIUM_TOTAL() external view returns (uint256);
}

// File: contracts/dependencies/openzeppelin/contracts/IERC20Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity 0.7.6;

import "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: contracts/protocol/libraries/helpers/Errors.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title Errors library
 * @author Aave
 * @notice Defines the error messages emitted by the different contracts of the Aave protocol
 * @dev Error messages prefix glossary:
 *  - VL = ValidationLogic
 *  - AVL = Additional ValidationLogic
 *  - MATH = Math libraries
 *  - CT = Common errors between tokens (AToken, VariableDebtToken and StableDebtToken)
 *  - AT = AToken
 *  - SDT = StableDebtToken
 *  - VDT = VariableDebtToken
 *  - LP = LendingPool
 *  - LPAPR = LendingPoolAddressesProviderRegistry
 *  - LPC = LendingPoolConfiguration
 *  - RL = ReserveLogic
 *  - LPCM = LendingPoolCollateralManager
 *  - P = Pausable
 */
library Errors {
    //common errors
    string public constant CALLER_NOT_POOL_ADMIN = "33"; // 'The caller must be the pool admin'
    string public constant BORROW_ALLOWANCE_NOT_ENOUGH = "59"; // User borrows on behalf, but allowance are too small

    //contract specific errors
    string public constant VL_INVALID_AMOUNT = "1"; // 'Amount must be greater than 0'
    string public constant VL_NO_ACTIVE_RESERVE = "2"; // 'Action requires an active reserve'
    string public constant VL_RESERVE_FROZEN = "3"; // 'Action cannot be performed because the reserve is frozen'
    string public constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = "4"; // 'The current liquidity is not enough'
    string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "5"; // 'User cannot withdraw more than the available balance'
    string public constant VL_TRANSFER_NOT_ALLOWED = "6"; // 'Transfer cannot be allowed.'
    string public constant VL_BORROWING_NOT_ENABLED = "7"; // 'Borrowing is not enabled'
    string public constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = "8"; // 'Invalid interest rate mode selected'
    string public constant VL_COLLATERAL_BALANCE_IS_0 = "9"; // 'The collateral balance is 0'
    string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD =
        "10"; // 'Health factor is lesser than the liquidation threshold'
    string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "11"; // 'There is not enough collateral to cover a new borrow'
    string public constant VL_STABLE_BORROWING_NOT_ENABLED = "12"; // stable borrowing not enabled
    string public constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = "13"; // collateral is (mostly) the same currency that is being borrowed
    string public constant VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE = "14"; // 'The requested amount is greater than the max loan size in stable rate mode
    string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "15"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
    string public constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = "16"; // 'To repay on behalf of an user an explicit amount to repay is needed'
    string public constant VL_NO_STABLE_RATE_LOAN_IN_RESERVE = "17"; // 'User does not have a stable rate loan in progress on this reserve'
    string public constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = "18"; // 'User does not have a variable rate loan in progress on this reserve'
    string public constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = "19"; // 'The underlying balance needs to be greater than 0'
    string public constant VL_DEPOSIT_ALREADY_IN_USE = "20"; // 'User deposit is already being used as collateral'
    string public constant LP_NOT_ENOUGH_STABLE_BORROW_BALANCE = "21"; // 'User does not have any stable rate loan for this reserve'
    string public constant LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = "22"; // 'Interest rate rebalance conditions were not met'
    string public constant LP_LIQUIDATION_CALL_FAILED = "23"; // 'Liquidation call failed'
    string public constant LP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = "24"; // 'There is not enough liquidity available to borrow'
    string public constant LP_REQUESTED_AMOUNT_TOO_SMALL = "25"; // 'The requested amount is too small for a FlashLoan.'
    string public constant LP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = "26"; // 'The actual balance of the protocol is inconsistent'
    string public constant LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR = "27"; // 'The caller of the function is not the lending pool configurator'
    string public constant LP_INCONSISTENT_FLASHLOAN_PARAMS = "28";
    string public constant CT_CALLER_MUST_BE_LENDING_POOL = "29"; // 'The caller of this function must be a lending pool'
    string public constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = "30"; // 'User cannot give allowance to himself'
    string public constant CT_TRANSFER_AMOUNT_NOT_GT_0 = "31"; // 'Transferred amount needs to be greater than zero'
    string public constant RL_RESERVE_ALREADY_INITIALIZED = "32"; // 'Reserve has already been initialized'
    string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "34"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_ATOKEN_POOL_ADDRESS = "35"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_STABLE_DEBT_TOKEN_POOL_ADDRESS = "36"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = "37"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_STABLE_DEBT_TOKEN_UNDERLYING_ADDRESS =
        "38"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS =
        "39"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_ADDRESSES_PROVIDER_ID = "40"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_CONFIGURATION = "75"; // 'Invalid risk parameters for the reserve'
    string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "76"; // 'The caller must be the emergency admin'
    string public constant LPAPR_PROVIDER_NOT_REGISTERED = "41"; // 'Provider is not registered'
    string public constant LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = "42"; // 'Health factor is not below the threshold'
    string public constant LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = "43"; // 'The collateral chosen cannot be liquidated'
    string public constant LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "44"; // 'User did not borrow the specified currency'
    string public constant LPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = "45"; // "There isn't enough liquidity available to liquidate"
    string public constant LPCM_NO_ERRORS = "46"; // 'No errors'
    string public constant LP_INVALID_FLASHLOAN_MODE = "47"; //Invalid flashloan mode selected
    string public constant MATH_MULTIPLICATION_OVERFLOW = "48";
    string public constant MATH_ADDITION_OVERFLOW = "49";
    string public constant MATH_DIVISION_BY_ZERO = "50";
    string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "51"; //  Liquidity index overflows uint128
    string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "52"; //  Variable borrow index overflows uint128
    string public constant RL_LIQUIDITY_RATE_OVERFLOW = "53"; //  Liquidity rate overflows uint128
    string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "54"; //  Variable borrow rate overflows uint128
    string public constant RL_STABLE_BORROW_RATE_OVERFLOW = "55"; //  Stable borrow rate overflows uint128
    string public constant CT_INVALID_MINT_AMOUNT = "56"; //invalid amount to mint
    string public constant LP_FAILED_REPAY_WITH_COLLATERAL = "57";
    string public constant CT_INVALID_BURN_AMOUNT = "58"; //invalid amount to burn
    string public constant LP_FAILED_COLLATERAL_SWAP = "60";
    string public constant LP_INVALID_EQUAL_ASSETS_TO_SWAP = "61";
    string public constant LP_REENTRANCY_NOT_ALLOWED = "62";
    string public constant LP_CALLER_MUST_BE_AN_ATOKEN = "63";
    string public constant LP_IS_PAUSED = "64"; // 'Pool is paused'
    string public constant LP_NO_MORE_RESERVES_ALLOWED = "65";
    string public constant LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = "66";
    string public constant RC_INVALID_LTV = "67";
    string public constant RC_INVALID_LIQ_THRESHOLD = "68";
    string public constant RC_INVALID_LIQ_BONUS = "69";
    string public constant RC_INVALID_DECIMALS = "70";
    string public constant RC_INVALID_RESERVE_FACTOR = "71";
    string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "72";
    string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = "73";
    string public constant LP_INCONSISTENT_PARAMS_LENGTH = "74";
    string public constant UL_INVALID_INDEX = "77";
    string public constant LP_NOT_CONTRACT = "78";
    string public constant SDT_STABLE_DEBT_OVERFLOW = "79";
    string public constant SDT_BURN_EXCEEDS_BALANCE = "80";

    string public constant AVL_EXCEED_MAX_GLOBAL_DEPOSIT_SIZE = "81";
    string public constant AVL_EXCEED_MAX_INDIVIDUAL_DEPOSIT_SIZE = "82";
    string public constant AVL_BELOW_MIN_INDIVIDUAL_DEPOSIT_SIZE = "83";
    string public constant AVL_EXCEED_MAX_GLOBAL_BORROW_SIZE = "84";
    string public constant AVL_EXCEED_MAX_INDIVIDUAL_BORROW_SIZE = "85";
    string public constant AVL_EXCEED_BORROW_MAX_PERCENTAGE = "86";
    string public constant AVL_INVALID_BORROW_MAX_PERCENTAGE = "87";

    string public constant LP_USER_IS_BLACKLISTED = "88";
    string public constant LP_USER_NOT_ELIGIBLE_FOR_BLACKLIST = "89";

    enum CollateralManagerErrors {
        NO_ERROR,
        NO_COLLATERAL_AVAILABLE,
        COLLATERAL_CANNOT_BE_LIQUIDATED,
        CURRRENCY_NOT_BORROWED,
        HEALTH_FACTOR_ABOVE_THRESHOLD,
        NOT_ENOUGH_LIQUIDITY,
        NO_ACTIVE_RESERVE,
        HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD,
        INVALID_EQUAL_ASSETS_TO_SWAP,
        FROZEN_RESERVE
    }
}

// File: contracts/protocol/libraries/math/PercentageMath.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import {Errors} from "../helpers/Errors.sol";

/**
 * @title PercentageMath library
 * @author Aave
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded half up
 **/

library PercentageMath {
    uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
    uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;

    /**
     * @dev Executes a percentage multiplication
     * @param value The value of which the percentage needs to be calculated
     * @param percentage The percentage of the value to be calculated
     * @return The percentage of value
     **/
    function percentMul(uint256 value, uint256 percentage)
        internal
        pure
        returns (uint256)
    {
        if (value == 0 || percentage == 0) {
            return 0;
        }

        require(
            value <= (type(uint256).max - HALF_PERCENT) / percentage,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR;
    }

    /**
     * @dev Executes a percentage division
     * @param value The value of which the percentage needs to be calculated
     * @param percentage The percentage of the value to be calculated
     * @return The value divided the percentage
     **/
    function percentDiv(uint256 value, uint256 percentage)
        internal
        pure
        returns (uint256)
    {
        require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO);
        uint256 halfPercentage = percentage / 2;

        require(
            value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
    }
}

// File: contracts/protocol/libraries/types/DataTypes.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

library DataTypes {
    // refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties.
    struct ReserveData {
        //stores the reserve configuration
        ReserveConfigurationMap configuration;
        //the liquidity index. Expressed in ray
        uint128 liquidityIndex;
        //variable borrow index. Expressed in ray
        uint128 variableBorrowIndex;
        //the current supply rate. Expressed in ray
        uint128 currentLiquidityRate;
        //the current variable borrow rate. Expressed in ray
        uint128 currentVariableBorrowRate;
        //the current stable borrow rate. Expressed in ray
        uint128 currentStableBorrowRate;
        uint40 lastUpdateTimestamp;
        //tokens addresses
        address aTokenAddress;
        address stableDebtTokenAddress;
        address variableDebtTokenAddress;
        //address of the interest rate strategy
        address interestRateStrategyAddress;
        //the id of the reserve. Represents the position in the list of the active reserves
        uint8 id;
    }

    struct ReserveConfigurationMap {
        //bit 0-15: LTV
        //bit 16-31: Liq. threshold
        //bit 32-47: Liq. bonus
        //bit 48-55: Decimals
        //bit 56: Reserve is active
        //bit 57: reserve is frozen
        //bit 58: borrowing is enabled
        //bit 59: stable rate borrowing enabled
        //bit 60-63: reserved
        //bit 64-79: reserve factor
        uint256 data;
    }

    struct ReserveLimits {
        uint256 maxGlobalDepositSize;
        uint256 maxIndividualDepositSize;
        uint256 minIndividualDepositSize;
        uint256 maxGlobalBorrowSize;
        uint256 maxIndividualBorrowSize;
        uint256 maxBorrowBps;
    }

    struct UserConfigurationMap {
        uint256 data;
    }

    enum InterestRateMode {
        NONE,
        STABLE,
        VARIABLE
    }
}

// File: contracts/interfaces/IInitializableDebtToken.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import {ILendingPool} from "./ILendingPool.sol";

/**
 * @title IInitializableDebtToken
 * @notice Interface for the initialize function common between debt tokens
 * @author Aave
 **/
interface IInitializableDebtToken {
    /**
     * @dev Emitted when a debt token is initialized
     * @param underlyingAsset The address of the underlying asset
     * @param pool The address of the associated lending pool
     * @param debtTokenDecimals the decimals of the debt token
     * @param debtTokenName the name of the debt token
     * @param debtTokenSymbol the symbol of the debt token
     * @param params A set of encoded parameters for additional initialization
     **/
    event Initialized(
        address indexed underlyingAsset,
        address indexed pool,
        uint8 debtTokenDecimals,
        string debtTokenName,
        string debtTokenSymbol,
        bytes params
    );

    /**
     * @dev Initializes the debt token.
     * @param pool The address of the lending pool where this aToken will be used
     * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH)
     * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's
     * @param debtTokenName The name of the token
     * @param debtTokenSymbol The symbol of the token
     */
    function initialize(
        ILendingPool pool,
        address underlyingAsset,
        uint8 debtTokenDecimals,
        string memory debtTokenName,
        string memory debtTokenSymbol,
        bytes calldata params
    ) external;
}

// File: contracts/interfaces/IInitializableAToken.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import {ILendingPool} from "./ILendingPool.sol";

/**
 * @title IInitializableAToken
 * @notice Interface for the initialize function on AToken
 * @author Aave
 **/
interface IInitializableAToken {
    /**
     * @dev Emitted when an aToken is initialized
     * @param underlyingAsset The address of the underlying asset
     * @param pool The address of the associated lending pool
     * @param treasury The address of the treasury
     * @param aTokenDecimals the decimals of the underlying
     * @param aTokenName the name of the aToken
     * @param aTokenSymbol the symbol of the aToken
     * @param params A set of encoded parameters for additional initialization
     **/
    event Initialized(
        address indexed underlyingAsset,
        address indexed pool,
        address treasury,
        uint8 aTokenDecimals,
        string aTokenName,
        string aTokenSymbol,
        bytes params
    );

    /**
     * @dev Initializes the aToken
     * @param pool The address of the lending pool where this aToken will be used
     * @param treasury The address of the Aave treasury, receiving the fees on this aToken
     * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH)
     * @param aTokenDecimals The decimals of the aToken, same as the underlying asset's
     * @param aTokenName The name of the aToken
     * @param aTokenSymbol The symbol of the aToken
     */
    function initialize(
        ILendingPool pool,
        address treasury,
        address underlyingAsset,
        uint8 aTokenDecimals,
        string calldata aTokenName,
        string calldata aTokenSymbol,
        bytes calldata params
    ) external;
}

// File: contracts/interfaces/ILendingPoolConfigurator.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;

interface ILendingPoolConfigurator {
    struct InitReserveInput {
        address aTokenImpl;
        address stableDebtTokenImpl;
        address variableDebtTokenImpl;
        uint8 underlyingAssetDecimals;
        address interestRateStrategyAddress;
        address underlyingAsset;
        address treasury;
        string underlyingAssetName;
        string aTokenName;
        string aTokenSymbol;
        string variableDebtTokenName;
        string variableDebtTokenSymbol;
        string stableDebtTokenName;
        string stableDebtTokenSymbol;
        uint256 maxGlobalDepositSize;
        uint256 maxIndividualDepositSize;
        uint256 minIndividualDepositSize;
        uint256 maxGlobalBorrowSize;
        uint256 maxIndividualBorrowSize;
        uint256 maxBorrowBps;
        bytes params;
    }

    struct UpdateATokenInput {
        address asset;
        address treasury;
        string name;
        string symbol;
        address implementation;
        bytes params;
    }

    struct UpdateDebtTokenInput {
        address asset;
        string name;
        string symbol;
        address implementation;
        bytes params;
    }

    /**
     * @dev Emitted when a reserve is initialized.
     * @param asset The address of the underlying asset of the reserve
     * @param aToken The address of the associated aToken contract
     * @param stableDebtToken The address of the associated stable rate debt token
     * @param variableDebtToken The address of the associated variable rate debt token
     * @param interestRateStrategyAddress The address of the interest rate strategy for the reserve
     **/
    event ReserveInitialized(
        address indexed asset,
        address indexed aToken,
        address stableDebtToken,
        address variableDebtToken,
        address interestRateStrategyAddress
    );

    /**
     * @dev Emitted when borrowing is enabled on a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param stableRateEnabled True if stable rate borrowing is enabled, false otherwise
     **/
    event BorrowingEnabledOnReserve(
        address indexed asset,
        bool stableRateEnabled
    );

    /**
     * @dev Emitted when borrowing is disabled on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    event BorrowingDisabledOnReserve(address indexed asset);

    /**
     * @dev Emitted when the collateralization risk parameters for the specified asset are updated.
     * @param asset The address of the underlying asset of the reserve
     * @param ltv The loan to value of the asset when used as collateral
     * @param liquidationThreshold The threshold at which loans using this asset as collateral will be considered undercollateralized
     * @param liquidationBonus The bonus liquidators receive to liquidate this asset
     **/
    event CollateralConfigurationChanged(
        address indexed asset,
        uint256 ltv,
        uint256 liquidationThreshold,
        uint256 liquidationBonus
    );

    /**
     * @dev Emitted when stable rate borrowing is enabled on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    event StableRateEnabledOnReserve(address indexed asset);

    /**
     * @dev Emitted when stable rate borrowing is disabled on a reserve
     * @param asset The address of the underlying asset of the reserve
     **/
    event StableRateDisabledOnReserve(address indexed asset);

    /**
     * @dev Emitted when a reserve is activated
     * @param asset The address of the underlying asset of the reserve
     **/
    event ReserveActivated(address indexed asset);

    /**
     * @dev Emitted when a reserve is deactivated
     * @param asset The address of the underlying asset of the reserve
     **/
    event ReserveDeactivated(address indexed asset);

    /**
     * @dev Emitted when a reserve is frozen
     * @param asset The address of the underlying asset of the reserve
     **/
    event ReserveFrozen(address indexed asset);

    /**
     * @dev Emitted when a reserve is unfrozen
     * @param asset The address of the underlying asset of the reserve
     **/
    event ReserveUnfrozen(address indexed asset);

    /**
     * @dev Emitted when a reserve factor is updated
     * @param asset The address of the underlying asset of the reserve
     * @param factor The new reserve factor
     **/
    event ReserveFactorChanged(address indexed asset, uint256 factor);

    /**
     * @dev Emitted when the reserve decimals are updated
     * @param asset The address of the underlying asset of the reserve
     * @param decimals The new decimals
     **/
    event ReserveDecimalsChanged(address indexed asset, uint256 decimals);

    /**
     * @dev Emitted when a reserve interest strategy contract is updated
     * @param asset The address of the underlying asset of the reserve
     * @param strategy The new address of the interest strategy contract
     **/
    event ReserveInterestRateStrategyChanged(
        address indexed asset,
        address strategy
    );

    /**
     * @dev Emitted when the reserve maximum global deposit size is updated
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalDepositSize The new maximum global deposit size
     **/
    event ReserveMaxGlobalDepositSizeChanged(
        address indexed asset,
        uint256 maxGlobalDepositSize
    );

    /**
     * @dev Emitted when the reserve maximum individual deposit size is updated
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualDepositSize The new maximum individual deposit size
     **/
    event ReserveMaxIndividualDepositSizeChanged(
        address indexed asset,
        uint256 maxIndividualDepositSize
    );

    /**
     * @dev Emitted when the reserve minimum individual deposit size is updated
     * @param asset The address of the underlying asset of the reserve
     * @param minIndividualDepositSize The new minimum individual deposit size
     **/
    event ReserveMinIndividualDepositSizeChanged(
        address indexed asset,
        uint256 minIndividualDepositSize
    );

    /**
     * @dev Emitted when the reserve maximum global borrow size is updated
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalBorrowSize The new maximum global borrow size
     **/
    event ReserveMaxGlobalBorrowSizeChanged(
        address indexed asset,
        uint256 maxGlobalBorrowSize
    );

    /**
     * @dev Emitted when the reserve maximum individual borrow size is updated
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualBorrowSize The new maximum individual borrow size
     **/
    event ReserveMaxIndividualBorrowSizeChanged(
        address indexed asset,
        uint256 maxIndividualBorrowSize
    );

    /**
     * @dev Emitted when the reserve maximum borrow bps is updated
     * @param asset The address of the underlying asset of the reserve
     * @param maxBorrowBps The new maximum borrow bps
     **/
    event ReserveMaxBorrowBpsChanged(
        address indexed asset,
        uint256 maxBorrowBps
    );

    /**
     * @dev Emitted when an aToken implementation is upgraded
     * @param asset The address of the underlying asset of the reserve
     * @param proxy The aToken proxy address
     * @param implementation The new aToken implementation
     **/
    event ATokenUpgraded(
        address indexed asset,
        address indexed proxy,
        address indexed implementation
    );

    /**
     * @dev Emitted when the implementation of a stable debt token is upgraded
     * @param asset The address of the underlying asset of the reserve
     * @param proxy The stable debt token proxy address
     * @param implementation The new aToken implementation
     **/
    event StableDebtTokenUpgraded(
        address indexed asset,
        address indexed proxy,
        address indexed implementation
    );

    /**
     * @dev Emitted when the implementation of a variable debt token is upgraded
     * @param asset The address of the underlying asset of the reserve
     * @param proxy The variable debt token proxy address
     * @param implementation The new aToken implementation
     **/
    event VariableDebtTokenUpgraded(
        address indexed asset,
        address indexed proxy,
        address indexed implementation
    );

    /**
     * @dev Updates the maximum global deposit size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalDepositSize The new maximum global deposit size of the reserve
     **/
    function setMaxGlobalDepositSize(
        address asset,
        uint256 maxGlobalDepositSize
    ) external;

    /**
     * @dev Updates the maximum individual deposit size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualDepositSize The new maximum individual deposit size of the reserve
     **/
    function setMaxIndividualDepositSize(
        address asset,
        uint256 maxIndividualDepositSize
    ) external;

    /**
     * @dev Updates the maximum global borrow size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxGlobalBorrowSize The new maximum global borrow size of the reserve
     **/
    function setMaxGlobalBorrowSize(address asset, uint256 maxGlobalBorrowSize)
        external;

    /**
     * @dev Updates the maximum individual borrow size of a reserve
     * @param asset The address of the underlying asset of the reserve
     * @param maxIndividualBorrowSize The new maximum individual borrow size of the reserve
     **/
    function setMaxIndividualBorrowSize(
        address asset,
        uint256 maxIndividualBorrowSize
    ) external;
}

// File: contracts/protocol/libraries/aave-upgradeability/BaseImmutableAdminUpgradeabilityProxy.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import "../../../dependencies/openzeppelin/upgradeability/BaseUpgradeabilityProxy.sol";

/**
 * @title BaseImmutableAdminUpgradeabilityProxy
 * @author Aave, inspired by the OpenZeppelin upgradeability proxy pattern
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks. The admin role is stored in an immutable, which
 * helps saving transactions costs
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract BaseImmutableAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
    address immutable ADMIN;

    constructor(address admin) {
        require(admin != address(0), "Admin can not be zero address");
        ADMIN = admin;
    }

    modifier ifAdmin() {
        if (msg.sender == ADMIN) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @return The address of the proxy admin.
     */
    function admin() external ifAdmin returns (address) {
        return ADMIN;
    }

    /**
     * @return The address of the implementation.
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }

    /**
     * @dev Upgrade the backing implementation of the proxy.
     * Only the admin can call this function.
     * @param newImplementation Address of the new implementation.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the backing implementation of the proxy and call a function
     * on the new implementation.
     * This is useful to initialize the proxied contract.
     * @param newImplementation Address of the new implementation.
     * @param data Data to send as msg.data in the low level call.
     * It should include the signature and the parameters of the function to be called, as described in
     * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data)
        external
        payable
        ifAdmin
    {
        _upgradeTo(newImplementation);
        (bool success, ) = newImplementation.delegatecall(data);
        require(success, "Call on new implementation failed");
    }

    /**
     * @dev Only fall back when the sender is not the admin.
     */
    function _willFallback() internal virtual override {
        require(
            msg.sender != ADMIN,
            "Cannot call fallback function from the proxy admin"
        );
        super._willFallback();
    }
}

// File: contracts/dependencies/openzeppelin/upgradeability/InitializableUpgradeabilityProxy.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import "./BaseUpgradeabilityProxy.sol";

/**
 * @title InitializableUpgradeabilityProxy
 * @dev Extends BaseUpgradeabilityProxy with an initializer for initializing
 * implementation and init data.
 */
contract InitializableUpgradeabilityProxy is BaseUpgradeabilityProxy {
    /**
     * @dev Contract initializer.
     * @param _logic Address of the initial implementation.
     * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
     * It should include the signature and the parameters of the function to be called, as described in
     * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
     * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
     */
    function initialize(address _logic, bytes memory _data) public payable {
        require(_implementation() == address(0));
        assert(
            IMPLEMENTATION_SLOT ==
                bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1)
        );
        _setImplementation(_logic);
        if (_data.length > 0) {
            (bool success, ) = _logic.delegatecall(_data);
            require(success);
        }
    }
}

// File: contracts/dependencies/openzeppelin/upgradeability/BaseUpgradeabilityProxy.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import "./Proxy.sol";
import "../contracts/Address.sol";

/**
 * @title BaseUpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract BaseUpgradeabilityProxy is Proxy {
    /**
     * @dev Emitted when the implementation is upgraded.
     * @param implementation Address of the new implementation.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant IMPLEMENTATION_SLOT =
        0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation.
     * @return impl Address of the current implementation
     */
    function _implementation() internal view override returns (address impl) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        //solium-disable-next-line
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     * @param newImplementation Address of the new implementation.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Sets the implementation address of the proxy.
     * @param newImplementation Address of the new implementation.
     */
    function _setImplementation(address newImplementation) internal {
        require(
            Address.isContract(newImplementation),
            "Cannot set a proxy implementation to a non-contract address"
        );

        bytes32 slot = IMPLEMENTATION_SLOT;

        //solium-disable-next-line
        assembly {
            sstore(slot, newImplementation)
        }
    }
}

// File: contracts/dependencies/openzeppelin/upgradeability/Proxy.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
abstract contract Proxy {
    /**
     * @dev Fallback function.
     * Implemented entirely in `_fallback`.
     */
    fallback() external payable {
        _fallback();
    }

    /**
     * @return The Address of the implementation.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates execution to an implementation contract.
     * This is a low level function that doesn't return to its internal call site.
     * It will return to the external caller whatever the implementation returns.
     * @param implementation Address to delegate.
     */
    function _delegate(address implementation) internal {
        //solium-disable-next-line
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(
                gas(),
                implementation,
                0,
                calldatasize(),
                0,
                0
            )

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev Function that is run as the first thing in the fallback function.
     * Can be redefined in derived contracts to add functionality.
     * Redefinitions must call super._willFallback().
     */
    function _willFallback() internal virtual {}

    /**
     * @dev fallback implementation.
     * Extracted to enable manual triggering.
     */
    function _fallback() internal {
        _willFallback();
        _delegate(_implementation());
    }
}

// File: contracts/dependencies/openzeppelin/contracts/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // 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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}

// File: contracts/dependencies/openzeppelin/contracts/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}