Contract Address Details

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

import {SafeMath} from "../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {IERC20} from "../../dependencies/openzeppelin/contracts/IERC20.sol";
import {SafeERC20} from "../../dependencies/openzeppelin/contracts/SafeERC20.sol";
import {Address} from "../../dependencies/openzeppelin/contracts/Address.sol";
import {ILendingPoolAddressesProvider} from "../../interfaces/ILendingPoolAddressesProvider.sol";
import {IAToken} from "../../interfaces/IAToken.sol";
import {IVariableDebtToken} from "../../interfaces/IVariableDebtToken.sol";
import {IFlashLoanReceiver} from "../../flashloan/interfaces/IFlashLoanReceiver.sol";
import {IPriceOracleGetter} from "../../interfaces/IPriceOracleGetter.sol";
import {IStableDebtToken} from "../../interfaces/IStableDebtToken.sol";
import {ILendingPool} from "../../interfaces/ILendingPool.sol";
import {VersionedInitializable} from "../libraries/aave-upgradeability/VersionedInitializable.sol";
import {Helpers} from "../libraries/helpers/Helpers.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {GenericLogic} from "../libraries/logic/GenericLogic.sol";
import {ValidationLogic} from "../libraries/logic/ValidationLogic.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {UserConfiguration} from "../libraries/configuration/UserConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {LendingPoolStorage} from "./LendingPoolStorage.sol";

/**
 * @title LendingPool contract
 * @dev Main point of interaction with an Aave protocol's market
 * - Users can:
 *   # Deposit
 *   # Withdraw
 *   # Borrow
 *   # Repay
 *   # Swap their loans between variable and stable rate
 *   # Enable/disable their deposits as collateral rebalance stable rate borrow positions
 *   # Liquidate positions
 *   # Execute Flash Loans
 * - To be covered by a proxy contract, owned by the LendingPoolAddressesProvider of the specific market
 * - All admin functions are callable by the LendingPoolConfigurator contract defined also in the
 *   LendingPoolAddressesProvider
 * @author Aave
 **/
contract LendingPool is
    VersionedInitializable,
    ILendingPool,
    LendingPoolStorage
{
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using SafeERC20 for IERC20;
    using ReserveLogic for DataTypes.ReserveData;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
    using UserConfiguration for DataTypes.UserConfigurationMap;

    uint256 public constant LENDINGPOOL_REVISION = 0x1;

    mapping(address => bool) public override isBlacklisted;

    modifier whenNotPaused() {
        _whenNotPaused();
        _;
    }

    modifier onlyLendingPoolConfigurator() {
        _onlyLendingPoolConfigurator();
        _;
    }

    function _whenNotPaused() internal view {
        require(!_paused, Errors.LP_IS_PAUSED);
    }

    function _onlyLendingPoolConfigurator() internal view {
        require(
            _addressesProvider.getLendingPoolConfigurator() == msg.sender,
            Errors.LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR
        );
    }

    function _notBlacklisted(address user) internal view {
        require(!isBlacklisted[user], Errors.LP_USER_IS_BLACKLISTED);
    }

    function getRevision() internal pure override returns (uint256) {
        return LENDINGPOOL_REVISION;
    }

    /**
     * @dev Function is invoked by the proxy contract when the LendingPool contract is added to the
     * LendingPoolAddressesProvider of the market.
     * - Caching the address of the LendingPoolAddressesProvider in order to reduce gas consumption
     *   on subsequent operations
     * @param provider The address of the LendingPoolAddressesProvider
     **/
    function initialize(ILendingPoolAddressesProvider provider)
        public
        initializer
    {
        _addressesProvider = provider;
        _maxStableRateBorrowSizePercent = 2500;
        _flashLoanPremiumTotal = 9;
        _maxNumberOfReserves = 128;
    }

    /**
     * @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 override whenNotPaused {
        _notBlacklisted(onBehalfOf);

        DataTypes.ReserveData storage reserve = _reserves[asset];

        ValidationLogic.validateDeposit(
            reserve,
            _reserveLimits[asset],
            onBehalfOf,
            amount
        );

        address aToken = reserve.aTokenAddress;

        reserve.updateState();
        reserve.updateInterestRates(asset, aToken, amount, 0);

        IERC20(asset).safeTransferFrom(msg.sender, aToken, amount);

        bool isFirstDeposit = IAToken(aToken).mint(
            onBehalfOf,
            amount,
            reserve.liquidityIndex
        );

        if (isFirstDeposit) {
            _usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
            emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
        }

        emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode);
    }

    /**
     * @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 override whenNotPaused returns (uint256) {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        address aToken = reserve.aTokenAddress;

        uint256 userBalance = IAToken(aToken).balanceOf(msg.sender);

        uint256 amountToWithdraw = amount;

        if (amount == type(uint256).max) {
            amountToWithdraw = userBalance;
        }

        ValidationLogic.validateWithdraw(
            asset,
            amountToWithdraw,
            userBalance,
            _reserves,
            _reserveLimits[asset],
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        reserve.updateState();

        reserve.updateInterestRates(asset, aToken, 0, amountToWithdraw);

        if (amountToWithdraw == userBalance) {
            _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
            emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
        }

        IAToken(aToken).burn(
            msg.sender,
            to,
            amountToWithdraw,
            reserve.liquidityIndex
        );

        emit Withdraw(asset, msg.sender, to, amountToWithdraw);

        return amountToWithdraw;
    }

    /**
     * @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 override whenNotPaused {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        _executeBorrow(
            ExecuteBorrowParams(
                asset,
                msg.sender,
                onBehalfOf,
                amount,
                interestRateMode,
                reserve.aTokenAddress,
                referralCode,
                true
            )
        );
    }

    /**
     * @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
    ) public override whenNotPaused returns (uint256) {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        (uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(
            onBehalfOf,
            reserve
        );

        DataTypes.InterestRateMode interestRateMode = DataTypes
            .InterestRateMode(rateMode);

        ValidationLogic.validateRepay(
            reserve,
            amount,
            interestRateMode,
            onBehalfOf,
            stableDebt,
            variableDebt
        );

        uint256 paybackAmount = interestRateMode ==
            DataTypes.InterestRateMode.STABLE
            ? stableDebt
            : variableDebt;

        if (amount < paybackAmount) {
            paybackAmount = amount;
        }

        reserve.updateState();

        if (interestRateMode == DataTypes.InterestRateMode.STABLE) {
            IStableDebtToken(reserve.stableDebtTokenAddress).burn(
                onBehalfOf,
                paybackAmount
            );
        } else {
            IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
                onBehalfOf,
                paybackAmount,
                reserve.variableBorrowIndex
            );
        }

        address aToken = reserve.aTokenAddress;
        reserve.updateInterestRates(asset, aToken, paybackAmount, 0);

        if (stableDebt.add(variableDebt).sub(paybackAmount) == 0) {
            _usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
        }

        IERC20(asset).safeTransferFrom(msg.sender, aToken, paybackAmount);

        IAToken(aToken).handleRepayment(msg.sender, paybackAmount);

        emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);

        return paybackAmount;
    }

    /**
     * @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
        override
        whenNotPaused
    {
        // verify that the user has a health factor of zero
        (
            ,
            ,
            ,
            ,
            // totalCollateralETH
            // totalDebtETH
            // ltv
            // currentLiquidationThreshold
            uint256 healthFactor
        ) = GenericLogic.calculateUserAccountData(
                user,
                _reserves,
                _usersConfig[user],
                _reservesList,
                _reservesCount,
                _addressesProvider.getPriceOracle()
            );
        require(healthFactor == 0, Errors.LP_USER_NOT_ELIGIBLE_FOR_BLACKLIST);

        for (uint256 i = 0; i < _reservesCount; i++) {
            address asset = _reservesList[i];
            (uint256 stableDebt, uint256 variableDebt) = Helpers
                .getUserCurrentDebt(user, _reserves[asset]);
            if (stableDebt > 0) {
                repay(asset, stableDebt, 1, user);
            }
            if (variableDebt > 0) {
                repay(asset, variableDebt, 2, user);
            }
        }

        isBlacklisted[user] = true;
        emit Blacklist(user);
    }

    /**
     * @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
        override
        whenNotPaused
    {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        (uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(
            msg.sender,
            reserve
        );

        DataTypes.InterestRateMode interestRateMode = DataTypes
            .InterestRateMode(rateMode);

        ValidationLogic.validateSwapRateMode(
            reserve,
            _usersConfig[msg.sender],
            stableDebt,
            variableDebt,
            interestRateMode
        );

        reserve.updateState();

        if (interestRateMode == DataTypes.InterestRateMode.STABLE) {
            IStableDebtToken(reserve.stableDebtTokenAddress).burn(
                msg.sender,
                stableDebt
            );
            IVariableDebtToken(reserve.variableDebtTokenAddress).mint(
                msg.sender,
                msg.sender,
                stableDebt,
                reserve.variableBorrowIndex
            );
        } else {
            IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
                msg.sender,
                variableDebt,
                reserve.variableBorrowIndex
            );
            IStableDebtToken(reserve.stableDebtTokenAddress).mint(
                msg.sender,
                msg.sender,
                variableDebt,
                reserve.currentStableBorrowRate
            );
        }

        reserve.updateInterestRates(asset, reserve.aTokenAddress, 0, 0);

        emit Swap(asset, msg.sender, rateMode);
    }

    /**
     * @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
        override
        whenNotPaused
    {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress);
        IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress);
        address aTokenAddress = reserve.aTokenAddress;

        uint256 stableDebt = IERC20(stableDebtToken).balanceOf(user);

        ValidationLogic.validateRebalanceStableBorrowRate(
            reserve,
            asset,
            stableDebtToken,
            variableDebtToken,
            aTokenAddress
        );

        reserve.updateState();

        IStableDebtToken(address(stableDebtToken)).burn(user, stableDebt);
        IStableDebtToken(address(stableDebtToken)).mint(
            user,
            user,
            stableDebt,
            reserve.currentStableBorrowRate
        );

        reserve.updateInterestRates(asset, aTokenAddress, 0, 0);

        emit RebalanceStableBorrowRate(asset, user);
    }

    /**
     * @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
        override
        whenNotPaused
    {
        _notBlacklisted(msg.sender); // can not change collateral setting after getting blacklisted (so no more borrowing)

        DataTypes.ReserveData storage reserve = _reserves[asset];

        ValidationLogic.validateSetUseReserveAsCollateral(
            reserve,
            asset,
            useAsCollateral,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        _usersConfig[msg.sender].setUsingAsCollateral(
            reserve.id,
            useAsCollateral
        );

        if (useAsCollateral) {
            emit ReserveUsedAsCollateralEnabled(asset, msg.sender);
        } else {
            emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
        }
    }

    /**
     * @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 override whenNotPaused {
        address collateralManager = _addressesProvider
            .getLendingPoolCollateralManager();

        //solium-disable-next-line
        (bool success, bytes memory result) = collateralManager.delegatecall(
            abi.encodeWithSignature(
                "liquidationCall(address,address,address,uint256,bool)",
                collateralAsset,
                debtAsset,
                user,
                debtToCover,
                receiveAToken
            )
        );

        require(success, Errors.LP_LIQUIDATION_CALL_FAILED);

        (uint256 returnCode, string memory returnMessage) = abi.decode(
            result,
            (uint256, string)
        );

        require(returnCode == 0, string(abi.encodePacked(returnMessage)));
    }

    struct FlashLoanLocalVars {
        IFlashLoanReceiver receiver;
        address oracle;
        uint256 i;
        address currentAsset;
        address currentATokenAddress;
        uint256 currentAmount;
        uint256 currentPremium;
        uint256 currentAmountPlusPremium;
        address debtToken;
    }

    /**
     * @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 override whenNotPaused {
        FlashLoanLocalVars memory vars;
        ValidationLogic.validateFlashloan(assets, amounts);
        address[] memory aTokenAddresses = new address[](assets.length);
        uint256[] memory premiums = new uint256[](assets.length);
        vars.receiver = IFlashLoanReceiver(receiverAddress);
        for (vars.i = 0; vars.i < assets.length; vars.i++) {
            aTokenAddresses[vars.i] = _reserves[assets[vars.i]].aTokenAddress;
            premiums[vars.i] = amounts[vars.i].mul(_flashLoanPremiumTotal).div(
                10000
            );
            IAToken(aTokenAddresses[vars.i]).transferUnderlyingTo(
                receiverAddress,
                amounts[vars.i]
            );
        }
        require(
            vars.receiver.executeOperation(
                assets,
                amounts,
                premiums,
                msg.sender,
                params
            ),
            Errors.LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN
        );
        for (vars.i = 0; vars.i < assets.length; vars.i++) {
            vars.currentAsset = assets[vars.i];
            vars.currentAmount = amounts[vars.i];
            vars.currentPremium = premiums[vars.i];
            vars.currentATokenAddress = aTokenAddresses[vars.i];
            vars.currentAmountPlusPremium = vars.currentAmount.add(
                vars.currentPremium
            );

            _reserves[vars.currentAsset].updateState();
            _reserves[vars.currentAsset].cumulateToLiquidityIndex(
                IERC20(vars.currentATokenAddress).totalSupply(),
                vars.currentPremium
            );
            _reserves[vars.currentAsset].updateInterestRates(
                vars.currentAsset,
                vars.currentATokenAddress,
                vars.currentAmountPlusPremium,
                0
            );
            IERC20(vars.currentAsset).safeTransferFrom(
                receiverAddress,
                vars.currentATokenAddress,
                vars.currentAmountPlusPremium
            );

            emit FlashLoan(
                receiverAddress,
                msg.sender,
                vars.currentAsset,
                vars.currentAmount,
                vars.currentPremium,
                referralCode
            );
        }
    }

    /**
     * @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
        override
        returns (DataTypes.ReserveData memory)
    {
        return _reserves[asset];
    }

    /**
     * @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
        override
        returns (DataTypes.ReserveLimits memory)
    {
        return _reserveLimits[asset];
    }

    /**
     * @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
        override
        returns (
            uint256 totalCollateralETH,
            uint256 totalDebtETH,
            uint256 availableBorrowsETH,
            uint256 currentLiquidationThreshold,
            uint256 ltv,
            uint256 healthFactor
        )
    {
        (
            totalCollateralETH,
            totalDebtETH,
            ltv,
            currentLiquidationThreshold,
            healthFactor
        ) = GenericLogic.calculateUserAccountData(
            user,
            _reserves,
            _usersConfig[user],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH(
            totalCollateralETH,
            totalDebtETH,
            ltv
        );
    }

    /**
     * @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
        override
        returns (DataTypes.ReserveConfigurationMap memory)
    {
        return _reserves[asset].configuration;
    }

    /**
     * @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
        override
        returns (DataTypes.UserConfigurationMap memory)
    {
        return _usersConfig[user];
    }

    /**
     * @dev Returns the normalized income per unit of asset
     * @param asset The address of the underlying asset of the reserve
     * @return The reserve's normalized income
     */
    function getReserveNormalizedIncome(address asset)
        external
        view
        virtual
        override
        returns (uint256)
    {
        return _reserves[asset].getNormalizedIncome();
    }

    /**
     * @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
        override
        returns (uint256)
    {
        return _reserves[asset].getNormalizedDebt();
    }

    /**
     * @dev Returns if the LendingPool is paused
     */
    function paused() external view override returns (bool) {
        return _paused;
    }

    /**
     * @dev Returns the list of the initialized reserves
     **/
    function getReservesList()
        external
        view
        override
        returns (address[] memory)
    {
        address[] memory _activeReserves = new address[](_reservesCount);

        for (uint256 i = 0; i < _reservesCount; i++) {
            _activeReserves[i] = _reservesList[i];
        }
        return _activeReserves;
    }

    /**
     * @dev Returns the cached LendingPoolAddressesProvider connected to this contract
     **/
    function getAddressesProvider()
        external
        view
        override
        returns (ILendingPoolAddressesProvider)
    {
        return _addressesProvider;
    }

    /**
     * @dev Returns the percentage of available liquidity that can be borrowed at once at stable rate
     */
    function MAX_STABLE_RATE_BORROW_SIZE_PERCENT()
        public
        view
        returns (uint256)
    {
        return _maxStableRateBorrowSizePercent;
    }

    /**
     * @dev Returns the fee on flash loans
     */
    function FLASHLOAN_PREMIUM_TOTAL() public view override returns (uint256) {
        return _flashLoanPremiumTotal;
    }

    /**
     * @dev Returns the maximum number of reserves supported to be listed in this LendingPool
     */
    function MAX_NUMBER_RESERVES() public view returns (uint256) {
        return _maxNumberOfReserves;
    }

    /**
     * @dev Validates and finalizes an aToken transfer
     * - Only callable by the overlying aToken of the `asset`
     * @param asset The address of the underlying asset of the aToken
     * @param from The user from which the aTokens are transferred
     * @param to The user receiving the aTokens
     * @param amount The amount being transferred/withdrawn
     * @param balanceFromBefore The aToken balance of the `from` user before the transfer
     * @param balanceToBefore The aToken balance of the `to` user before the transfer
     */
    function finalizeTransfer(
        address asset,
        address from,
        address to,
        uint256 amount,
        uint256 balanceFromBefore,
        uint256 balanceToBefore
    ) external override whenNotPaused {
        require(
            msg.sender == _reserves[asset].aTokenAddress,
            Errors.LP_CALLER_MUST_BE_AN_ATOKEN
        );

        address oracle = _addressesProvider.getPriceOracle();
        ValidationLogic.validateTransferLimits(
            from,
            to,
            _reserves[asset],
            _reserveLimits[asset]
        );
        ValidationLogic.validateTransfer(
            from,
            _reserves,
            _usersConfig[from],
            _reservesList,
            _reservesCount,
            oracle
        );

        uint256 reserveId = _reserves[asset].id;

        if (from != to) {
            if (balanceFromBefore.sub(amount) == 0) {
                DataTypes.UserConfigurationMap
                    storage fromConfig = _usersConfig[from];
                fromConfig.setUsingAsCollateral(reserveId, false);
                emit ReserveUsedAsCollateralDisabled(asset, from);
            }

            if (balanceToBefore == 0 && amount != 0) {
                DataTypes.UserConfigurationMap storage toConfig = _usersConfig[
                    to
                ];
                toConfig.setUsingAsCollateral(reserveId, true);
                emit ReserveUsedAsCollateralEnabled(asset, to);
            }
        }
    }

    /**
     * @dev Initializes a reserve, activating it, assigning an aToken and debt tokens and an
     * interest rate strategy
     * - Only callable by the LendingPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param aTokenAddress The address of the aToken that will be assigned to the reserve
     * @param stableDebtAddress The address of the StableDebtToken that will be assigned to the reserve
     * @param variableDebtAddress The address of the VariableDebtToken that will be assigned to the reserve
     * @param interestRateStrategyAddress The address of the interest rate strategy contract
     **/
    function initReserve(
        address asset,
        address aTokenAddress,
        address stableDebtAddress,
        address variableDebtAddress,
        address interestRateStrategyAddress
    ) external override onlyLendingPoolConfigurator {
        require(Address.isContract(asset), Errors.LP_NOT_CONTRACT);
        _reserves[asset].init(
            aTokenAddress,
            stableDebtAddress,
            variableDebtAddress,
            interestRateStrategyAddress
        );
        _addReserveToList(asset);
    }

    /**
     * @dev Updates the address of the interest rate strategy contract
     * - Only callable by the LendingPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param rateStrategyAddress The address of the interest rate strategy contract
     **/
    function setReserveInterestRateStrategyAddress(
        address asset,
        address rateStrategyAddress
    ) external override onlyLendingPoolConfigurator {
        _reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
    }

    /**
     * @dev Sets the configuration bitmap of the reserve as a whole
     * - Only callable by the LendingPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param configuration The new configuration bitmap
     **/
    function setConfiguration(address asset, uint256 configuration)
        external
        override
        onlyLendingPoolConfigurator
    {
        _reserves[asset].configuration.data = configuration;
    }

    /**
     * @dev Sets the limits of the reserve as a whole
     * - Only callable by the LendingPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param reserveLimits The new reserve limits
     **/
    function setLimits(
        address asset,
        DataTypes.ReserveLimits calldata reserveLimits
    ) external override onlyLendingPoolConfigurator {
        _reserveLimits[asset] = reserveLimits;
    }

    /**
     * @dev Set the _pause state of a reserve
     * - Only callable by the LendingPoolConfigurator contract
     * @param val `true` to pause the reserve, `false` to un-pause it
     */
    function setPause(bool val) external override onlyLendingPoolConfigurator {
        _paused = val;
        if (_paused) {
            emit Paused();
        } else {
            emit Unpaused();
        }
    }

    struct ExecuteBorrowParams {
        address asset;
        address user;
        address onBehalfOf;
        uint256 amount;
        uint256 interestRateMode;
        address aTokenAddress;
        uint16 referralCode;
        bool releaseUnderlying;
    }

    function _executeBorrow(ExecuteBorrowParams memory vars) internal {
        DataTypes.ReserveData storage reserve = _reserves[vars.asset];
        DataTypes.UserConfigurationMap storage userConfig = _usersConfig[
            vars.onBehalfOf
        ];

        address oracle = _addressesProvider.getPriceOracle();
        uint256 price = IPriceOracleGetter(oracle).getAssetPrice(vars.asset);
        uint256 amountInETH = price.mul(vars.amount).div(
            10**reserve.configuration.getDecimals()
        );

        ValidationLogic.validateBorrowLimits(
            reserve,
            _reserveLimits[vars.asset],
            vars.onBehalfOf,
            vars.amount
        );
        ValidationLogic.validateBorrow(
            vars.asset,
            reserve,
            vars.onBehalfOf,
            vars.amount,
            amountInETH,
            vars.interestRateMode,
            _maxStableRateBorrowSizePercent,
            _reserves,
            userConfig,
            _reservesList,
            _reservesCount,
            oracle
        );

        reserve.updateState();

        uint256 currentStableRate = 0;

        bool isFirstBorrowing = false;
        if (
            DataTypes.InterestRateMode(vars.interestRateMode) ==
            DataTypes.InterestRateMode.STABLE
        ) {
            currentStableRate = reserve.currentStableBorrowRate;

            isFirstBorrowing = IStableDebtToken(reserve.stableDebtTokenAddress)
                .mint(
                    vars.user,
                    vars.onBehalfOf,
                    vars.amount,
                    currentStableRate
                );
        } else {
            isFirstBorrowing = IVariableDebtToken(
                reserve.variableDebtTokenAddress
            ).mint(
                    vars.user,
                    vars.onBehalfOf,
                    vars.amount,
                    reserve.variableBorrowIndex
                );
        }

        if (isFirstBorrowing) {
            userConfig.setBorrowing(reserve.id, true);
        }

        reserve.updateInterestRates(
            vars.asset,
            vars.aTokenAddress,
            0,
            vars.releaseUnderlying ? vars.amount : 0
        );

        if (vars.releaseUnderlying) {
            IAToken(vars.aTokenAddress).transferUnderlyingTo(
                vars.user,
                vars.amount
            );
        }

        emit Borrow(
            vars.asset,
            vars.user,
            vars.onBehalfOf,
            vars.amount,
            vars.interestRateMode,
            DataTypes.InterestRateMode(vars.interestRateMode) ==
                DataTypes.InterestRateMode.STABLE
                ? currentStableRate
                : reserve.currentVariableBorrowRate,
            vars.referralCode
        );
    }

    function _addReserveToList(address asset) internal {
        uint256 reservesCount = _reservesCount;

        require(
            reservesCount < _maxNumberOfReserves,
            Errors.LP_NO_MORE_RESERVES_ALLOWED
        );

        bool reserveAlreadyAdded = _reserves[asset].id != 0 ||
            _reservesList[0] == asset;

        if (!reserveAlreadyAdded) {
            _reserves[asset].id = uint8(reservesCount);
            _reservesList[reservesCount] = asset;

            _reservesCount = reservesCount + 1;
        }
    }
}
        

// 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);
            }
        }
    }
}
          

// 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
    );
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";

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

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

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

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(
            value
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

import {ILendingPoolAddressesProvider} from "../../interfaces/ILendingPoolAddressesProvider.sol";
import {ILendingPool} from "../../interfaces/ILendingPool.sol";

/**
 * @title IFlashLoanReceiver interface
 * @notice Interface for the Aave fee IFlashLoanReceiver.
 * @author Aave
 * @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract
 **/
interface IFlashLoanReceiver {
    function executeOperation(
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata premiums,
        address initiator,
        bytes calldata params
    ) external returns (bool);

    function ADDRESSES_PROVIDER()
        external
        view
        returns (ILendingPoolAddressesProvider);

    function LENDING_POOL() external view returns (ILendingPool);
}
          

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

import {IERC20} from "../dependencies/openzeppelin/contracts/IERC20.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IInitializableAToken} from "./IInitializableAToken.sol";
import {IPhiatIncentivesController} from "./IPhiatIncentivesController.sol";

interface IAToken is IERC20, IScaledBalanceToken, IInitializableAToken {
    /**
     * @dev Emitted after the mint action
     * @param from The address performing the mint
     * @param value The amount being
     * @param index The new liquidity index of the reserve
     **/
    event Mint(address indexed from, uint256 value, uint256 index);

    /**
     * @dev Mints `amount` aTokens to `user`
     * @param user The address receiving the minted tokens
     * @param amount The amount of tokens getting minted
     * @param index The new liquidity index of the reserve
     * @return `true` if the the previous balance of the user was 0
     */
    function mint(
        address user,
        uint256 amount,
        uint256 index
    ) external returns (bool);

    /**
     * @dev Emitted after aTokens are burned
     * @param from The owner of the aTokens, getting them burned
     * @param target The address that will receive the underlying
     * @param value The amount being burned
     * @param index The new liquidity index of the reserve
     **/
    event Burn(
        address indexed from,
        address indexed target,
        uint256 value,
        uint256 index
    );

    /**
     * @dev Emitted during the transfer action
     * @param from The user whose tokens are being transferred
     * @param to The recipient
     * @param value The amount being transferred
     * @param index The new liquidity index of the reserve
     **/
    event BalanceTransfer(
        address indexed from,
        address indexed to,
        uint256 value,
        uint256 index
    );

    /**
     * @dev Burns aTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
     * @param user The owner of the aTokens, getting them burned
     * @param receiverOfUnderlying The address that will receive the underlying
     * @param amount The amount being burned
     * @param index The new liquidity index of the reserve
     **/
    function burn(
        address user,
        address receiverOfUnderlying,
        uint256 amount,
        uint256 index
    ) external;

    /**
     * @dev Mints aTokens to the reserve treasury
     * @param amount The amount of tokens getting minted
     * @param index The new liquidity index of the reserve
     */
    function mintToTreasury(uint256 amount, uint256 index) external;

    /**
     * @dev Transfers aTokens in the event of a borrow being liquidated, in case the liquidators reclaims the aToken
     * @param from The address getting liquidated, current owner of the aTokens
     * @param to The recipient
     * @param value The amount of tokens getting transferred
     **/
    function transferOnLiquidation(
        address from,
        address to,
        uint256 value
    ) external;

    /**
     * @dev Transfers the underlying asset to `target`. Used by the LendingPool to transfer
     * assets in borrow(), withdraw() and flashLoan()
     * @param user The recipient of the underlying
     * @param amount The amount getting transferred
     * @return The amount transferred
     **/
    function transferUnderlyingTo(address user, uint256 amount)
        external
        returns (uint256);

    /**
     * @dev Invoked to execute actions on the aToken side after a repayment.
     * @param user The user executing the repayment
     * @param amount The amount getting repaid
     **/
    function handleRepayment(address user, uint256 amount) external;

    /**
     * @dev Returns the address of the incentives controller contract
     **/
    function getIncentivesController()
        external
        view
        returns (IPhiatIncentivesController);

    /**
     * @dev Returns the address of treasury
     **/
    function RESERVE_TREASURY_ADDRESS() external view returns (address);

    /**
     * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH)
     **/
    function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}
          

// 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;
}
          

// 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;
}
          

// 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);
}
          

// 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;
}
          

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

interface IPhiatIncentivesController {
    event RewardsAccrued(address indexed user, uint256 amount);

    event RewardsClaimed(address indexed user, uint256 amount);

    /**
     * @dev add asset to accumulate rewards
     * @param asset The address of the reference asset of the distribution
     */
    function addAsset(address asset) external;

    /**
     * @dev Returns the configuration of the distribution for a certain asset
     * @param asset The address of the reference asset of the distribution
     * @return The asset index, the emission per second and the last updated timestamp
     **/
    function getAssetData(address asset)
        external
        view
        returns (
            uint256,
            uint256,
            uint256
        );

    /**
     * LEGACY **************************
     * @dev Returns the configuration of the distribution for a certain asset
     * @param asset The address of the reference asset of the distribution
     * @return The asset index, the emission per second and the last updated timestamp
     **/
    function assets(address asset)
        external
        view
        returns (
            uint128,
            uint128,
            uint256
        );

    /**
     * @dev Called by the corresponding asset on any update that affects the rewards distribution
     * @param user The address of the user
     * @param userBalance The (old) balance of the user of the asset in the lending pool
     *      latest user balance (if different) can be retrieved from sender's balanceOf function
     * @param totalSupply The (old) total supply of the asset in the lending pool
     *      latest total supply (if different) can be retrieved from sender's totalSupply function
     **/
    function handleAction(
        address user,
        uint256 userBalance,
        uint256 totalSupply
    ) external;

    /**
     * @dev returns the unclaimed rewards of the user
     * @param user the address of the user
     * @return the unclaimed user rewards
     */
    function getUserUnclaimedRewards(address user)
        external
        view
        returns (uint256);

    /**
     * @dev returns the unclaimed rewards of the user
     * @param user the address of the user
     * @param asset The asset to incentivize
     * @return the user index for the asset
     */
    function getUserAssetData(address user, address asset)
        external
        view
        returns (uint256);

    /**
     * @dev claim all user rewards
     * @param user the address of the user
     */
    function claimRewards(address user) external;

    /**
     * @dev for backward compatibility with previous implementation of the Incentives controller
     */
    function REWARD_TOKEN() external view returns (address);

    /**
     * @dev for backward compatibility with previous implementation of the Incentives controller
     */
    function PRECISION() external view returns (uint8);

    /**
     * @dev Gets the distribution end timestamp of the emissions
     */
    function DISTRIBUTION_END() external view returns (uint256);
}
          

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

/**
 * @title IPriceOracleGetter interface
 * @notice Interface for the Aave price oracle.
 **/

interface IPriceOracleGetter {
    /**
     * @dev returns the asset price in ETH
     * @param asset the address of the asset
     * @return the ETH price of the asset
     **/
    function getAssetPrice(address asset) external view returns (uint256);
}
          

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

/**
 * @title IReserveInterestRateStrategyInterface interface
 * @dev Interface for the calculation of the interest rates
 * @author Aave
 */
interface IReserveInterestRateStrategy {
    function baseVariableBorrowRate() external view returns (uint256);

    function getMaxVariableBorrowRate() external view returns (uint256);

    function calculateInterestRates(
        address reserve,
        uint256 availableLiquidity,
        uint256 totalStableDebt,
        uint256 totalVariableDebt,
        uint256 averageStableBorrowRate,
        uint256 reserveFactor
    )
        external
        view
        returns (
            uint256,
            uint256,
            uint256
        );

    function calculateInterestRates(
        address reserve,
        address aToken,
        uint256 liquidityAdded,
        uint256 liquidityTaken,
        uint256 totalStableDebt,
        uint256 totalVariableDebt,
        uint256 averageStableBorrowRate,
        uint256 reserveFactor
    )
        external
        view
        returns (
            uint256 liquidityRate,
            uint256 stableBorrowRate,
            uint256 variableBorrowRate
        );
}
          

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

interface IScaledBalanceToken {
    /**
     * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
     * updated stored balance divided by the reserve's liquidity index at the moment of the update
     * @param user The user whose balance is calculated
     * @return The scaled balance of the user
     **/
    function scaledBalanceOf(address user) external view returns (uint256);

    /**
     * @dev Returns the scaled balance of the user and the scaled total supply.
     * @param user The address of the user
     * @return The scaled balance of the user
     * @return The scaled balance and the scaled total supply
     **/
    function getScaledUserBalanceAndSupply(address user)
        external
        view
        returns (uint256, uint256);

    /**
     * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
     * @return The scaled total supply
     **/
    function scaledTotalSupply() external view returns (uint256);
}
          

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

import {IInitializableDebtToken} from "./IInitializableDebtToken.sol";
import {IPhiatIncentivesController} from "./IPhiatIncentivesController.sol";

/**
 * @title IStableDebtToken
 * @notice Defines the interface for the stable debt token
 * @dev It does not inherit from IERC20 to save in code size
 * @author Aave
 **/

interface IStableDebtToken is IInitializableDebtToken {
    /**
     * @dev Emitted when new stable debt is minted
     * @param user The address of the user who triggered the minting
     * @param onBehalfOf The recipient of stable debt tokens
     * @param amount The amount minted
     * @param currentBalance The current balance of the user
     * @param balanceIncrease The increase in balance since the last action of the user
     * @param newRate The rate of the debt after the minting
     * @param avgStableRate The new average stable rate after the minting
     * @param newTotalSupply The new total supply of the stable debt token after the action
     **/
    event Mint(
        address indexed user,
        address indexed onBehalfOf,
        uint256 amount,
        uint256 currentBalance,
        uint256 balanceIncrease,
        uint256 newRate,
        uint256 avgStableRate,
        uint256 newTotalSupply
    );

    /**
     * @dev Emitted when new stable debt is burned
     * @param user The address of the user
     * @param amount The amount being burned
     * @param currentBalance The current balance of the user
     * @param balanceIncrease The the increase in balance since the last action of the user
     * @param avgStableRate The new average stable rate after the burning
     * @param newTotalSupply The new total supply of the stable debt token after the action
     **/
    event Burn(
        address indexed user,
        uint256 amount,
        uint256 currentBalance,
        uint256 balanceIncrease,
        uint256 avgStableRate,
        uint256 newTotalSupply
    );

    /**
     * @dev Mints debt token to the `onBehalfOf` address.
     * - The resulting rate is the weighted average between the rate of the new debt
     * and the rate of the previous debt
     * @param user The address receiving the borrowed underlying, being the delegatee in case
     * of credit delegate, or same as `onBehalfOf` otherwise
     * @param onBehalfOf The address receiving the debt tokens
     * @param amount The amount of debt tokens to mint
     * @param rate The rate of the debt being minted
     **/
    function mint(
        address user,
        address onBehalfOf,
        uint256 amount,
        uint256 rate
    ) external returns (bool);

    /**
     * @dev Burns debt of `user`
     * - The resulting rate is the weighted average between the rate of the new debt
     * and the rate of the previous debt
     * @param user The address of the user getting his debt burned
     * @param amount The amount of debt tokens getting burned
     **/
    function burn(address user, uint256 amount) external;

    /**
     * @dev Returns the average rate of all the stable rate loans.
     * @return The average stable rate
     **/
    function getAverageStableRate() external view returns (uint256);

    /**
     * @dev Returns the stable rate of the user debt
     * @return The stable rate of the user
     **/
    function getUserStableRate(address user) external view returns (uint256);

    /**
     * @dev Returns the timestamp of the last update of the user
     * @return The timestamp
     **/
    function getUserLastUpdated(address user) external view returns (uint40);

    /**
     * @dev Returns the principal, the total supply and the average stable rate
     **/
    function getSupplyData()
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint40
        );

    /**
     * @dev Returns the timestamp of the last update of the total supply
     * @return The timestamp
     **/
    function getTotalSupplyLastUpdated() external view returns (uint40);

    /**
     * @dev Returns the total supply and the average stable rate
     **/
    function getTotalSupplyAndAvgRate()
        external
        view
        returns (uint256, uint256);

    /**
     * @dev Returns the principal debt balance of the user
     * @return The debt balance of the user since the last burn/mint action
     **/
    function principalBalanceOf(address user) external view returns (uint256);

    /**
     * @dev Returns the address of the incentives controller contract
     **/
    function getIncentivesController()
        external
        view
        returns (IPhiatIncentivesController);
}
          

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

import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IInitializableDebtToken} from "./IInitializableDebtToken.sol";
import {IPhiatIncentivesController} from "./IPhiatIncentivesController.sol";

/**
 * @title IVariableDebtToken
 * @author Aave
 * @notice Defines the basic interface for a variable debt token.
 **/
interface IVariableDebtToken is IScaledBalanceToken, IInitializableDebtToken {
    /**
     * @dev Emitted after the mint action
     * @param from The address performing the mint
     * @param onBehalfOf The address of the user on which behalf minting has been performed
     * @param value The amount to be minted
     * @param index The last index of the reserve
     **/
    event Mint(
        address indexed from,
        address indexed onBehalfOf,
        uint256 value,
        uint256 index
    );

    /**
     * @dev Mints debt token to the `onBehalfOf` address
     * @param user The address receiving the borrowed underlying, being the delegatee in case
     * of credit delegate, or same as `onBehalfOf` otherwise
     * @param onBehalfOf The address receiving the debt tokens
     * @param amount The amount of debt being minted
     * @param index The variable debt index of the reserve
     * @return `true` if the the previous balance of the user is 0
     **/
    function mint(
        address user,
        address onBehalfOf,
        uint256 amount,
        uint256 index
    ) external returns (bool);

    /**
     * @dev Emitted when variable debt is burnt
     * @param user The user which debt has been burned
     * @param amount The amount of debt being burned
     * @param index The index of the user
     **/
    event Burn(address indexed user, uint256 amount, uint256 index);

    /**
     * @dev Burns user variable debt
     * @param user The user which debt is burnt
     * @param index The variable debt index of the reserve
     **/
    function burn(
        address user,
        uint256 amount,
        uint256 index
    ) external;

    /**
     * @dev Returns the address of the incentives controller contract
     **/
    function getIncentivesController()
        external
        view
        returns (IPhiatIncentivesController);
}
          

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

import {UserConfiguration} from "../libraries/configuration/UserConfiguration.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {ILendingPoolAddressesProvider} from "../../interfaces/ILendingPoolAddressesProvider.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";

contract LendingPoolStorage {
    using ReserveLogic for DataTypes.ReserveData;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
    using UserConfiguration for DataTypes.UserConfigurationMap;

    ILendingPoolAddressesProvider internal _addressesProvider;

    mapping(address => DataTypes.ReserveData) internal _reserves;
    mapping(address => DataTypes.ReserveLimits) internal _reserveLimits;
    mapping(address => DataTypes.UserConfigurationMap) internal _usersConfig;

    // the list of the available reserves, structured as a mapping for gas savings reasons
    mapping(uint256 => address) internal _reservesList;

    uint256 internal _reservesCount;

    bool internal _paused;

    uint256 internal _maxStableRateBorrowSizePercent;

    uint256 internal _flashLoanPremiumTotal;

    uint256 internal _maxNumberOfReserves;
}
          

// 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;
}
          

// 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
        );
    }
}
          

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

import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title UserConfiguration library
 * @author Aave
 * @notice Implements the bitmap logic to handle the user configuration
 */
library UserConfiguration {
    uint256 internal constant BORROWING_MASK =
        0x5555555555555555555555555555555555555555555555555555555555555555;

    /**
     * @dev Sets if the user is borrowing the reserve identified by reserveIndex
     * @param self The configuration object
     * @param reserveIndex The index of the reserve in the bitmap
     * @param borrowing True if the user is borrowing the reserve, false otherwise
     **/
    function setBorrowing(
        DataTypes.UserConfigurationMap storage self,
        uint256 reserveIndex,
        bool borrowing
    ) internal {
        require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
        self.data =
            (self.data & ~(1 << (reserveIndex * 2))) |
            (uint256(borrowing ? 1 : 0) << (reserveIndex * 2));
    }

    /**
     * @dev Sets if the user is using as collateral the reserve identified by reserveIndex
     * @param self The configuration object
     * @param reserveIndex The index of the reserve in the bitmap
     * @param usingAsCollateral True if the user is usin the reserve as collateral, false otherwise
     **/
    function setUsingAsCollateral(
        DataTypes.UserConfigurationMap storage self,
        uint256 reserveIndex,
        bool usingAsCollateral
    ) internal {
        require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
        self.data =
            (self.data & ~(1 << (reserveIndex * 2 + 1))) |
            (uint256(usingAsCollateral ? 1 : 0) << (reserveIndex * 2 + 1));
    }

    /**
     * @dev Used to validate if a user has been using the reserve for borrowing or as collateral
     * @param self The configuration object
     * @param reserveIndex The index of the reserve in the bitmap
     * @return True if the user has been using a reserve for borrowing or as collateral, false otherwise
     **/
    function isUsingAsCollateralOrBorrowing(
        DataTypes.UserConfigurationMap memory self,
        uint256 reserveIndex
    ) internal pure returns (bool) {
        require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
        return (self.data >> (reserveIndex * 2)) & 3 != 0;
    }

    /**
     * @dev Used to validate if a user has been using the reserve for borrowing
     * @param self The configuration object
     * @param reserveIndex The index of the reserve in the bitmap
     * @return True if the user has been using a reserve for borrowing, false otherwise
     **/
    function isBorrowing(
        DataTypes.UserConfigurationMap memory self,
        uint256 reserveIndex
    ) internal pure returns (bool) {
        require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
        return (self.data >> (reserveIndex * 2)) & 1 != 0;
    }

    /**
     * @dev Used to validate if a user has been using the reserve as collateral
     * @param self The configuration object
     * @param reserveIndex The index of the reserve in the bitmap
     * @return True if the user has been using a reserve as collateral, false otherwise
     **/
    function isUsingAsCollateral(
        DataTypes.UserConfigurationMap memory self,
        uint256 reserveIndex
    ) internal pure returns (bool) {
        require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
        return (self.data >> (reserveIndex * 2 + 1)) & 1 != 0;
    }

    /**
     * @dev Used to validate if a user has been borrowing from any reserve
     * @param self The configuration object
     * @return True if the user has been borrowing any reserve, false otherwise
     **/
    function isBorrowingAny(DataTypes.UserConfigurationMap memory self)
        internal
        pure
        returns (bool)
    {
        return self.data & BORROWING_MASK != 0;
    }

    /**
     * @dev Used to validate if a user has not been using any reserve
     * @param self The configuration object
     * @return True if the user has been borrowing any reserve, false otherwise
     **/
    function isEmpty(DataTypes.UserConfigurationMap memory self)
        internal
        pure
        returns (bool)
    {
        return self.data == 0;
    }
}
          

// 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
    }
}
          

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

import {IERC20} from "../../../dependencies/openzeppelin/contracts/IERC20.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title Helpers library
 * @author Aave
 */
library Helpers {
    /**
     * @dev Fetches the user current stable and variable debt balances
     * @param user The user address
     * @param reserve The reserve data object
     * @return The stable and variable debt balance
     **/
    function getUserCurrentDebt(
        address user,
        DataTypes.ReserveData storage reserve
    ) internal view returns (uint256, uint256) {
        return (
            IERC20(reserve.stableDebtTokenAddress).balanceOf(user),
            IERC20(reserve.variableDebtTokenAddress).balanceOf(user)
        );
    }

    function getUserCurrentDebtMemory(
        address user,
        DataTypes.ReserveData memory reserve
    ) internal view returns (uint256, uint256) {
        return (
            IERC20(reserve.stableDebtTokenAddress).balanceOf(user),
            IERC20(reserve.variableDebtTokenAddress).balanceOf(user)
        );
    }
}
          

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

import {SafeMath} from "../../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {IERC20} from "../../../dependencies/openzeppelin/contracts/IERC20.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {UserConfiguration} from "../configuration/UserConfiguration.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {IPriceOracleGetter} from "../../../interfaces/IPriceOracleGetter.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title GenericLogic library
 * @author Aave
 * @title Implements protocol-level logic to calculate and validate the state of a user
 */
library GenericLogic {
    using ReserveLogic for DataTypes.ReserveData;
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
    using UserConfiguration for DataTypes.UserConfigurationMap;

    uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;

    struct balanceDecreaseAllowedLocalVars {
        uint256 decimals;
        uint256 liquidationThreshold;
        uint256 totalCollateralInETH;
        uint256 totalDebtInETH;
        uint256 avgLiquidationThreshold;
        uint256 amountToDecreaseInETH;
        uint256 collateralBalanceAfterDecrease;
        uint256 liquidationThresholdAfterDecrease;
        uint256 healthFactorAfterDecrease;
        bool reserveUsageAsCollateralEnabled;
    }

    /**
     * @dev Checks if a specific balance decrease is allowed
     * (i.e. doesn't bring the user borrow position health factor under HEALTH_FACTOR_LIQUIDATION_THRESHOLD)
     * @param asset The address of the underlying asset of the reserve
     * @param user The address of the user
     * @param amount The amount to decrease
     * @param reservesData The data of all the reserves
     * @param userConfig The user configuration
     * @param reserves The list of all the active reserves
     * @param oracle The address of the oracle contract
     * @return true if the decrease of the balance is allowed
     **/
    function balanceDecreaseAllowed(
        address asset,
        address user,
        uint256 amount,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap calldata userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view returns (bool) {
        if (
            !userConfig.isBorrowingAny() ||
            !userConfig.isUsingAsCollateral(reservesData[asset].id)
        ) {
            return true;
        }

        balanceDecreaseAllowedLocalVars memory vars;

        (, vars.liquidationThreshold, , vars.decimals, ) = reservesData[asset]
            .configuration
            .getParams();

        if (vars.liquidationThreshold == 0) {
            return true;
        }

        (
            vars.totalCollateralInETH,
            vars.totalDebtInETH,
            ,
            vars.avgLiquidationThreshold,

        ) = calculateUserAccountData(
            user,
            reservesData,
            userConfig,
            reserves,
            reservesCount,
            oracle
        );

        if (vars.totalDebtInETH == 0) {
            return true;
        }

        vars.amountToDecreaseInETH = IPriceOracleGetter(oracle)
            .getAssetPrice(asset)
            .mul(amount)
            .div(10**vars.decimals);

        vars.collateralBalanceAfterDecrease = vars.totalCollateralInETH.sub(
            vars.amountToDecreaseInETH
        );

        //if there is a borrow, there can't be 0 collateral
        if (vars.collateralBalanceAfterDecrease == 0) {
            return false;
        }

        vars.liquidationThresholdAfterDecrease = vars
            .totalCollateralInETH
            .mul(vars.avgLiquidationThreshold)
            .sub(vars.amountToDecreaseInETH.mul(vars.liquidationThreshold))
            .div(vars.collateralBalanceAfterDecrease);

        uint256 healthFactorAfterDecrease = calculateHealthFactorFromBalances(
            vars.collateralBalanceAfterDecrease,
            vars.totalDebtInETH,
            vars.liquidationThresholdAfterDecrease
        );

        return
            healthFactorAfterDecrease >=
            GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD;
    }

    struct CalculateUserAccountDataVars {
        uint256 reserveUnitPrice;
        uint256 tokenUnit;
        uint256 compoundedLiquidityBalance;
        uint256 compoundedBorrowBalance;
        uint256 decimals;
        uint256 ltv;
        uint256 liquidationThreshold;
        uint256 i;
        uint256 healthFactor;
        uint256 totalCollateralInETH;
        uint256 totalDebtInETH;
        uint256 avgLtv;
        uint256 avgLiquidationThreshold;
        uint256 reservesLength;
        bool healthFactorBelowThreshold;
        address currentReserveAddress;
        bool usageAsCollateralEnabled;
        bool userUsesReserveAsCollateral;
    }

    /**
     * @dev Calculates the user data across the reserves.
     * this includes the total liquidity/collateral/borrow balances in ETH,
     * the average Loan To Value, the average Liquidation Ratio, and the Health factor.
     * @param user The address of the user
     * @param reservesData Data of all the reserves
     * @param userConfig The configuration of the user
     * @param reserves The list of the available reserves
     * @param oracle The price oracle address
     * @return The total collateral and total debt of the user in ETH, the avg ltv, liquidation threshold and the HF
     **/
    function calculateUserAccountData(
        address user,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap memory userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    )
        internal
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        CalculateUserAccountDataVars memory vars;

        if (userConfig.isEmpty()) {
            return (0, 0, 0, 0, uint256(-1));
        }
        for (vars.i = 0; vars.i < reservesCount; vars.i++) {
            if (!userConfig.isUsingAsCollateralOrBorrowing(vars.i)) {
                continue;
            }

            vars.currentReserveAddress = reserves[vars.i];
            DataTypes.ReserveData storage currentReserve = reservesData[
                vars.currentReserveAddress
            ];

            (
                vars.ltv,
                vars.liquidationThreshold,
                ,
                vars.decimals,

            ) = currentReserve.configuration.getParams();

            vars.tokenUnit = 10**vars.decimals;
            vars.reserveUnitPrice = IPriceOracleGetter(oracle).getAssetPrice(
                vars.currentReserveAddress
            );

            if (
                vars.liquidationThreshold != 0 &&
                userConfig.isUsingAsCollateral(vars.i)
            ) {
                vars.compoundedLiquidityBalance = IERC20(
                    currentReserve.aTokenAddress
                ).balanceOf(user);

                uint256 liquidityBalanceETH = vars
                    .reserveUnitPrice
                    .mul(vars.compoundedLiquidityBalance)
                    .div(vars.tokenUnit);

                vars.totalCollateralInETH = vars.totalCollateralInETH.add(
                    liquidityBalanceETH
                );

                vars.avgLtv = vars.avgLtv.add(
                    liquidityBalanceETH.mul(vars.ltv)
                );
                vars.avgLiquidationThreshold = vars.avgLiquidationThreshold.add(
                    liquidityBalanceETH.mul(vars.liquidationThreshold)
                );
            }

            if (userConfig.isBorrowing(vars.i)) {
                vars.compoundedBorrowBalance = IERC20(
                    currentReserve.stableDebtTokenAddress
                ).balanceOf(user);
                vars.compoundedBorrowBalance = vars.compoundedBorrowBalance.add(
                    IERC20(currentReserve.variableDebtTokenAddress).balanceOf(
                        user
                    )
                );

                vars.totalDebtInETH = vars.totalDebtInETH.add(
                    vars.reserveUnitPrice.mul(vars.compoundedBorrowBalance).div(
                        vars.tokenUnit
                    )
                );
            }
        }

        vars.avgLtv = vars.totalCollateralInETH > 0
            ? vars.avgLtv.div(vars.totalCollateralInETH)
            : 0;
        vars.avgLiquidationThreshold = vars.totalCollateralInETH > 0
            ? vars.avgLiquidationThreshold.div(vars.totalCollateralInETH)
            : 0;

        vars.healthFactor = calculateHealthFactorFromBalances(
            vars.totalCollateralInETH,
            vars.totalDebtInETH,
            vars.avgLiquidationThreshold
        );
        return (
            vars.totalCollateralInETH,
            vars.totalDebtInETH,
            vars.avgLtv,
            vars.avgLiquidationThreshold,
            vars.healthFactor
        );
    }

    /**
     * @dev Calculates the health factor from the corresponding balances
     * @param totalCollateralInETH The total collateral in ETH
     * @param totalDebtInETH The total debt in ETH
     * @param liquidationThreshold The avg liquidation threshold
     * @return The health factor calculated from the balances provided
     **/
    function calculateHealthFactorFromBalances(
        uint256 totalCollateralInETH,
        uint256 totalDebtInETH,
        uint256 liquidationThreshold
    ) internal pure returns (uint256) {
        if (totalDebtInETH == 0) return uint256(-1);

        return
            (totalCollateralInETH.percentMul(liquidationThreshold)).wadDiv(
                totalDebtInETH
            );
    }

    /**
     * @dev Calculates the equivalent amount in ETH that an user can borrow, depending on the available collateral and the
     * average Loan To Value
     * @param totalCollateralInETH The total collateral in ETH
     * @param totalDebtInETH The total borrow balance
     * @param ltv The average loan to value
     * @return the amount available to borrow in ETH for the user
     **/

    function calculateAvailableBorrowsETH(
        uint256 totalCollateralInETH,
        uint256 totalDebtInETH,
        uint256 ltv
    ) internal pure returns (uint256) {
        uint256 availableBorrowsETH = totalCollateralInETH.percentMul(ltv);

        if (availableBorrowsETH < totalDebtInETH) {
            return 0;
        }

        availableBorrowsETH = availableBorrowsETH.sub(totalDebtInETH);
        return availableBorrowsETH;
    }
}
          

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

import {SafeMath} from "../../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {IERC20} from "../../../dependencies/openzeppelin/contracts/IERC20.sol";
import {SafeERC20} from "../../../dependencies/openzeppelin/contracts/SafeERC20.sol";
import {IAToken} from "../../../interfaces/IAToken.sol";
import {IStableDebtToken} from "../../../interfaces/IStableDebtToken.sol";
import {IVariableDebtToken} from "../../../interfaces/IVariableDebtToken.sol";
import {IReserveInterestRateStrategy} from "../../../interfaces/IReserveInterestRateStrategy.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title ReserveLogic library
 * @author Aave
 * @notice Implements the logic to update the reserves state
 */
library ReserveLogic {
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using SafeERC20 for IERC20;

    /**
     * @dev Emitted when the state of a reserve is updated
     * @param asset 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 asset,
        uint256 liquidityRate,
        uint256 stableBorrowRate,
        uint256 variableBorrowRate,
        uint256 liquidityIndex,
        uint256 variableBorrowIndex
    );

    using ReserveLogic for DataTypes.ReserveData;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;

    /**
     * @dev Returns the ongoing normalized income for the reserve
     * A value of 1e27 means there is no income. As time passes, the income is accrued
     * A value of 2*1e27 means for each unit of asset one unit of income has been accrued
     * @param reserve The reserve object
     * @return the normalized income. expressed in ray
     **/
    function getNormalizedIncome(DataTypes.ReserveData storage reserve)
        internal
        view
        returns (uint256)
    {
        uint40 timestamp = reserve.lastUpdateTimestamp;

        //solium-disable-next-line
        if (timestamp == uint40(block.timestamp)) {
            //if the index was updated in the same block, no need to perform any calculation
            return reserve.liquidityIndex;
        }

        uint256 cumulated = MathUtils
            .calculateLinearInterest(reserve.currentLiquidityRate, timestamp)
            .rayMul(reserve.liquidityIndex);

        return cumulated;
    }

    /**
     * @dev Returns the ongoing normalized variable debt for the reserve
     * A value of 1e27 means there is no debt. As time passes, the income is accrued
     * A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated
     * @param reserve The reserve object
     * @return The normalized variable debt. expressed in ray
     **/
    function getNormalizedDebt(DataTypes.ReserveData storage reserve)
        internal
        view
        returns (uint256)
    {
        uint40 timestamp = reserve.lastUpdateTimestamp;

        //solium-disable-next-line
        if (timestamp == uint40(block.timestamp)) {
            //if the index was updated in the same block, no need to perform any calculation
            return reserve.variableBorrowIndex;
        }

        uint256 cumulated = MathUtils
            .calculateCompoundedInterest(
                reserve.currentVariableBorrowRate,
                timestamp
            )
            .rayMul(reserve.variableBorrowIndex);

        return cumulated;
    }

    /**
     * @dev Updates the liquidity cumulative index and the variable borrow index.
     * @param reserve the reserve object
     **/
    function updateState(DataTypes.ReserveData storage reserve) internal {
        uint256 scaledVariableDebt = IVariableDebtToken(
            reserve.variableDebtTokenAddress
        ).scaledTotalSupply();
        uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex;
        uint256 previousLiquidityIndex = reserve.liquidityIndex;
        uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp;

        (
            uint256 newLiquidityIndex,
            uint256 newVariableBorrowIndex
        ) = _updateIndexes(
                reserve,
                scaledVariableDebt,
                previousLiquidityIndex,
                previousVariableBorrowIndex,
                lastUpdatedTimestamp
            );

        _mintToTreasury(
            reserve,
            scaledVariableDebt,
            previousVariableBorrowIndex,
            newLiquidityIndex,
            newVariableBorrowIndex,
            lastUpdatedTimestamp
        );
    }

    /**
     * @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate
     * the flashloan fee to the reserve, and spread it between all the depositors
     * @param reserve The reserve object
     * @param totalLiquidity The total liquidity available in the reserve
     * @param amount The amount to accomulate
     **/
    function cumulateToLiquidityIndex(
        DataTypes.ReserveData storage reserve,
        uint256 totalLiquidity,
        uint256 amount
    ) internal {
        uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(
            totalLiquidity.wadToRay()
        );

        uint256 result = amountToLiquidityRatio.add(WadRayMath.ray());

        result = result.rayMul(reserve.liquidityIndex);
        require(
            result <= type(uint128).max,
            Errors.RL_LIQUIDITY_INDEX_OVERFLOW
        );

        reserve.liquidityIndex = uint128(result);
    }

    /**
     * @dev Initializes a reserve
     * @param reserve The reserve object
     * @param aTokenAddress The address of the overlying atoken contract
     * @param interestRateStrategyAddress The address of the interest rate strategy contract
     **/
    function init(
        DataTypes.ReserveData storage reserve,
        address aTokenAddress,
        address stableDebtTokenAddress,
        address variableDebtTokenAddress,
        address interestRateStrategyAddress
    ) external {
        require(
            reserve.aTokenAddress == address(0),
            Errors.RL_RESERVE_ALREADY_INITIALIZED
        );

        reserve.liquidityIndex = uint128(WadRayMath.ray());
        reserve.variableBorrowIndex = uint128(WadRayMath.ray());
        reserve.aTokenAddress = aTokenAddress;
        reserve.stableDebtTokenAddress = stableDebtTokenAddress;
        reserve.variableDebtTokenAddress = variableDebtTokenAddress;
        reserve.interestRateStrategyAddress = interestRateStrategyAddress;
    }

    struct UpdateInterestRatesLocalVars {
        address stableDebtTokenAddress;
        uint256 availableLiquidity;
        uint256 totalStableDebt;
        uint256 newLiquidityRate;
        uint256 newStableRate;
        uint256 newVariableRate;
        uint256 avgStableRate;
        uint256 totalVariableDebt;
    }

    /**
     * @dev Updates the reserve current stable borrow rate, the current variable borrow rate and the current liquidity rate
     * @param reserve The address of the reserve to be updated
     * @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action
     * @param liquidityTaken The amount of liquidity taken from the protocol (redeem or borrow)
     **/
    function updateInterestRates(
        DataTypes.ReserveData storage reserve,
        address reserveAddress,
        address aTokenAddress,
        uint256 liquidityAdded,
        uint256 liquidityTaken
    ) internal {
        UpdateInterestRatesLocalVars memory vars;

        vars.stableDebtTokenAddress = reserve.stableDebtTokenAddress;

        (vars.totalStableDebt, vars.avgStableRate) = IStableDebtToken(
            vars.stableDebtTokenAddress
        ).getTotalSupplyAndAvgRate();

        //calculates the total variable debt locally using the scaled total supply instead
        //of totalSupply(), as it's noticeably cheaper. Also, the index has been
        //updated by the previous updateState() call
        vars.totalVariableDebt = IVariableDebtToken(
            reserve.variableDebtTokenAddress
        ).scaledTotalSupply().rayMul(reserve.variableBorrowIndex);

        (
            vars.newLiquidityRate,
            vars.newStableRate,
            vars.newVariableRate
        ) = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress)
            .calculateInterestRates(
                reserveAddress,
                aTokenAddress,
                liquidityAdded,
                liquidityTaken,
                vars.totalStableDebt,
                vars.totalVariableDebt,
                vars.avgStableRate,
                reserve.configuration.getReserveFactor()
            );
        require(
            vars.newLiquidityRate <= type(uint128).max,
            Errors.RL_LIQUIDITY_RATE_OVERFLOW
        );
        require(
            vars.newStableRate <= type(uint128).max,
            Errors.RL_STABLE_BORROW_RATE_OVERFLOW
        );
        require(
            vars.newVariableRate <= type(uint128).max,
            Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW
        );

        reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
        reserve.currentStableBorrowRate = uint128(vars.newStableRate);
        reserve.currentVariableBorrowRate = uint128(vars.newVariableRate);

        emit ReserveDataUpdated(
            reserveAddress,
            vars.newLiquidityRate,
            vars.newStableRate,
            vars.newVariableRate,
            reserve.liquidityIndex,
            reserve.variableBorrowIndex
        );
    }

    struct MintToTreasuryLocalVars {
        uint256 currentStableDebt;
        uint256 principalStableDebt;
        uint256 previousStableDebt;
        uint256 currentVariableDebt;
        uint256 previousVariableDebt;
        uint256 avgStableRate;
        uint256 cumulatedStableInterest;
        uint256 totalDebtAccrued;
        uint256 amountToMint;
        uint256 reserveFactor;
        uint40 stableSupplyUpdatedTimestamp;
    }

    /**
     * @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the
     * specific asset.
     * @param reserve The reserve reserve to be updated
     * @param scaledVariableDebt The current scaled total variable debt
     * @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest
     * @param newLiquidityIndex The new liquidity index
     * @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest
     **/
    function _mintToTreasury(
        DataTypes.ReserveData storage reserve,
        uint256 scaledVariableDebt,
        uint256 previousVariableBorrowIndex,
        uint256 newLiquidityIndex,
        uint256 newVariableBorrowIndex,
        uint40 timestamp
    ) internal {
        MintToTreasuryLocalVars memory vars;

        vars.reserveFactor = reserve.configuration.getReserveFactor();

        if (vars.reserveFactor == 0) {
            return;
        }

        //fetching the principal, total stable debt and the avg stable rate
        (
            vars.principalStableDebt,
            vars.currentStableDebt,
            vars.avgStableRate,
            vars.stableSupplyUpdatedTimestamp
        ) = IStableDebtToken(reserve.stableDebtTokenAddress).getSupplyData();

        //calculate the last principal variable debt
        vars.previousVariableDebt = scaledVariableDebt.rayMul(
            previousVariableBorrowIndex
        );

        //calculate the new total supply after accumulation of the index
        vars.currentVariableDebt = scaledVariableDebt.rayMul(
            newVariableBorrowIndex
        );

        //calculate the stable debt until the last timestamp update
        vars.cumulatedStableInterest = MathUtils.calculateCompoundedInterest(
            vars.avgStableRate,
            vars.stableSupplyUpdatedTimestamp,
            timestamp
        );

        vars.previousStableDebt = vars.principalStableDebt.rayMul(
            vars.cumulatedStableInterest
        );

        //debt accrued is the sum of the current debt minus the sum of the debt at the last update
        vars.totalDebtAccrued = vars
            .currentVariableDebt
            .add(vars.currentStableDebt)
            .sub(vars.previousVariableDebt)
            .sub(vars.previousStableDebt);

        vars.amountToMint = vars.totalDebtAccrued.percentMul(
            vars.reserveFactor
        );

        if (vars.amountToMint != 0) {
            IAToken(reserve.aTokenAddress).mintToTreasury(
                vars.amountToMint,
                newLiquidityIndex
            );
        }
    }

    /**
     * @dev Updates the reserve indexes and the timestamp of the update
     * @param reserve The reserve reserve to be updated
     * @param scaledVariableDebt The scaled variable debt
     * @param liquidityIndex The last stored liquidity index
     * @param variableBorrowIndex The last stored variable borrow index
     **/
    function _updateIndexes(
        DataTypes.ReserveData storage reserve,
        uint256 scaledVariableDebt,
        uint256 liquidityIndex,
        uint256 variableBorrowIndex,
        uint40 timestamp
    ) internal returns (uint256, uint256) {
        uint256 currentLiquidityRate = reserve.currentLiquidityRate;

        uint256 newLiquidityIndex = liquidityIndex;
        uint256 newVariableBorrowIndex = variableBorrowIndex;

        //only cumulating if there is any income being produced
        if (currentLiquidityRate > 0) {
            uint256 cumulatedLiquidityInterest = MathUtils
                .calculateLinearInterest(currentLiquidityRate, timestamp);
            newLiquidityIndex = cumulatedLiquidityInterest.rayMul(
                liquidityIndex
            );
            require(
                newLiquidityIndex <= type(uint128).max,
                Errors.RL_LIQUIDITY_INDEX_OVERFLOW
            );

            reserve.liquidityIndex = uint128(newLiquidityIndex);

            //as the liquidity rate might come only from stable rate loans, we need to ensure
            //that there is actual variable debt before accumulating
            if (scaledVariableDebt != 0) {
                uint256 cumulatedVariableBorrowInterest = MathUtils
                    .calculateCompoundedInterest(
                        reserve.currentVariableBorrowRate,
                        timestamp
                    );
                newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(
                        variableBorrowIndex
                    );
                require(
                    newVariableBorrowIndex <= type(uint128).max,
                    Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW
                );
                reserve.variableBorrowIndex = uint128(newVariableBorrowIndex);
            }
        }

        //solium-disable-next-line
        reserve.lastUpdateTimestamp = uint40(block.timestamp);
        return (newLiquidityIndex, newVariableBorrowIndex);
    }
}
          

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

import {SafeMath} from "../../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {IERC20} from "../../../dependencies/openzeppelin/contracts/IERC20.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {SafeERC20} from "../../../dependencies/openzeppelin/contracts/SafeERC20.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {UserConfiguration} from "../configuration/UserConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {Helpers} from "../helpers/Helpers.sol";
import {IAToken} from "../../../interfaces/IAToken.sol";
import {IPriceOracleGetter} from "../../../interfaces/IPriceOracleGetter.sol";
import {IReserveInterestRateStrategy} from "../../../interfaces/IReserveInterestRateStrategy.sol";
import {DataTypes} from "../types/DataTypes.sol";

/**
 * @title ReserveLogic library
 * @author Aave
 * @notice Implements functions to validate the different actions of the protocol
 */
library ValidationLogic {
    using ReserveLogic for DataTypes.ReserveData;
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using SafeERC20 for IERC20;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
    using UserConfiguration for DataTypes.UserConfigurationMap;

    uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
    uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%

    /**
     * @dev Validates a deposit action
     * @param reserve The reserve object on which the user is depositing
     * @param reserveLimits The reserve limits object on which the user is depositing
     * @param userAddress The address of the user
     * @param amount The amount to be deposited
     */
    function validateDeposit(
        DataTypes.ReserveData storage reserve,
        DataTypes.ReserveLimits storage reserveLimits,
        address userAddress,
        uint256 amount
    ) external view {
        (bool isActive, bool isFrozen, , ) = reserve.configuration.getFlags();

        require(amount != 0, Errors.VL_INVALID_AMOUNT);
        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
        require(!isFrozen, Errors.VL_RESERVE_FROZEN);

        if (
            reserveLimits.maxGlobalDepositSize > 0 ||
            reserveLimits.maxIndividualDepositSize > 0 ||
            reserveLimits.minIndividualDepositSize > 0
        ) {
            IERC20 aToken = IERC20(reserve.aTokenAddress);

            if (reserveLimits.maxGlobalDepositSize > 0) {
                require(
                    aToken.totalSupply().add(amount) <=
                        reserveLimits.maxGlobalDepositSize,
                    Errors.AVL_EXCEED_MAX_GLOBAL_DEPOSIT_SIZE
                );
            }
            if (
                reserveLimits.maxIndividualDepositSize > 0 ||
                reserveLimits.minIndividualDepositSize > 0
            ) {
                uint256 userATokenBalance = aToken.balanceOf(userAddress).add(
                    amount
                );
                if (reserveLimits.maxIndividualDepositSize > 0) {
                    require(
                        userATokenBalance <=
                            reserveLimits.maxIndividualDepositSize,
                        Errors.AVL_EXCEED_MAX_INDIVIDUAL_DEPOSIT_SIZE
                    );
                }
                if (reserveLimits.minIndividualDepositSize > 0) {
                    require(
                        userATokenBalance >=
                            reserveLimits.minIndividualDepositSize,
                        Errors.AVL_BELOW_MIN_INDIVIDUAL_DEPOSIT_SIZE
                    );
                }
            }
        }
    }

    /**
     * @dev Validates a withdraw action
     * @param reserveAddress The address of the reserve
     * @param amount The amount to be withdrawn
     * @param userBalance The balance of the user
     * @param reservesData The reserves state
     * @param reserveLimits The reserve limits object on which the user is withdrawing
     * @param userConfig The user configuration
     * @param reserves The addresses of the reserves
     * @param reservesCount The number of reserves
     * @param oracle The price oracle
     */
    function validateWithdraw(
        address reserveAddress,
        uint256 amount,
        uint256 userBalance,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.ReserveLimits storage reserveLimits,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        require(amount != 0, Errors.VL_INVALID_AMOUNT);
        require(
            amount <= userBalance,
            Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE
        );

        (bool isActive, , , ) = reservesData[reserveAddress]
            .configuration
            .getFlags();
        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);

        if (
            userBalance > amount && reserveLimits.minIndividualDepositSize > 0
        ) {
            require(
                userBalance.sub(amount) >=
                    reserveLimits.minIndividualDepositSize,
                Errors.AVL_BELOW_MIN_INDIVIDUAL_DEPOSIT_SIZE
            );
        }

        require(
            GenericLogic.balanceDecreaseAllowed(
                reserveAddress,
                msg.sender,
                amount,
                reservesData,
                userConfig,
                reserves,
                reservesCount,
                oracle
            ),
            Errors.VL_TRANSFER_NOT_ALLOWED
        );
    }

    struct ValidateBorrowLocalVars {
        uint256 currentLtv;
        uint256 currentLiquidationThreshold;
        uint256 amountOfCollateralNeededETH;
        uint256 userCollateralBalanceETH;
        uint256 userBorrowBalanceETH;
        uint256 availableLiquidity;
        uint256 healthFactor;
        bool isActive;
        bool isFrozen;
        bool borrowingEnabled;
        bool stableRateBorrowingEnabled;
    }

    /**
     * @dev Validates a borrow action
     * @param asset The address of the asset to borrow
     * @param reserve The reserve state from which the user is borrowing
     * @param userAddress The address of the user
     * @param amount The amount to be borrowed
     * @param amountInETH The amount to be borrowed, in ETH
     * @param interestRateMode The interest rate mode at which the user is borrowing
     * @param maxStableLoanPercent The max amount of the liquidity that can be borrowed at stable rate, in percentage
     * @param reservesData The state of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */
    function validateBorrow(
        address asset,
        DataTypes.ReserveData storage reserve,
        address userAddress,
        uint256 amount,
        uint256 amountInETH,
        uint256 interestRateMode,
        uint256 maxStableLoanPercent,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        ValidateBorrowLocalVars memory vars;

        (
            vars.isActive,
            vars.isFrozen,
            vars.borrowingEnabled,
            vars.stableRateBorrowingEnabled
        ) = reserve.configuration.getFlags();

        require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
        require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
        require(amount != 0, Errors.VL_INVALID_AMOUNT);

        require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);

        //validate interest rate mode
        require(
            uint256(DataTypes.InterestRateMode.VARIABLE) == interestRateMode ||
                uint256(DataTypes.InterestRateMode.STABLE) == interestRateMode,
            Errors.VL_INVALID_INTEREST_RATE_MODE_SELECTED
        );

        (
            vars.userCollateralBalanceETH,
            vars.userBorrowBalanceETH,
            vars.currentLtv,
            vars.currentLiquidationThreshold,
            vars.healthFactor
        ) = GenericLogic.calculateUserAccountData(
            userAddress,
            reservesData,
            userConfig,
            reserves,
            reservesCount,
            oracle
        );

        require(
            vars.userCollateralBalanceETH > 0,
            Errors.VL_COLLATERAL_BALANCE_IS_0
        );

        require(
            vars.healthFactor >
                GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
            Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD
        );

        //add the current already borrowed amount to the amount requested to calculate the total collateral needed.
        vars.amountOfCollateralNeededETH = vars
            .userBorrowBalanceETH
            .add(amountInETH)
            .percentDiv(vars.currentLtv); //LTV is calculated in percentage

        require(
            vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH,
            Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW
        );

        /**
         * Following conditions need to be met if the user is borrowing at a stable rate:
         * 1. Reserve must be enabled for stable rate borrowing
         * 2. Users cannot borrow from the reserve if their collateral is (mostly) the same currency
         *    they are borrowing, to prevent abuses.
         * 3. Users will be able to borrow only a portion of the total available liquidity
         **/

        if (interestRateMode == uint256(DataTypes.InterestRateMode.STABLE)) {
            //check if the borrow mode is stable and if stable rate borrowing is enabled on this reserve

            require(
                vars.stableRateBorrowingEnabled,
                Errors.VL_STABLE_BORROWING_NOT_ENABLED
            );

            require(
                !userConfig.isUsingAsCollateral(reserve.id) ||
                    reserve.configuration.getLtv() == 0 ||
                    amount >
                    IERC20(reserve.aTokenAddress).balanceOf(userAddress),
                Errors.VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY
            );

            vars.availableLiquidity = IERC20(asset).balanceOf(
                reserve.aTokenAddress
            );

            //calculate the max available loan size in stable rate mode as a percentage of the
            //available liquidity
            uint256 maxLoanSizeStable = vars.availableLiquidity.percentMul(
                maxStableLoanPercent
            );

            require(
                amount <= maxLoanSizeStable,
                Errors.VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE
            );
        }
    }

    /**
     * @dev Validates limits of a borrow action
     * @param reserve The reserve state from which the user is borrowing
     * @param reserveLimits The limits of reserve from which the user is borrowing
     * @param userAddress The address of the user
     * @param amount The amount to be borrowed
     */
    function validateBorrowLimits(
        DataTypes.ReserveData storage reserve,
        DataTypes.ReserveLimits storage reserveLimits,
        address userAddress,
        uint256 amount
    ) external view {
        if (
            reserveLimits.maxGlobalBorrowSize > 0 ||
            reserveLimits.maxIndividualBorrowSize > 0 ||
            reserveLimits.maxBorrowBps > 0
        ) {
            IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress);
            IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress);

            if (reserveLimits.maxGlobalBorrowSize > 0) {
                require(
                    stableDebtToken
                        .totalSupply()
                        .add(variableDebtToken.totalSupply())
                        .add(amount) <= reserveLimits.maxGlobalBorrowSize,
                    Errors.AVL_EXCEED_MAX_GLOBAL_BORROW_SIZE
                );
            }
            if (reserveLimits.maxIndividualBorrowSize > 0) {
                require(
                    stableDebtToken
                        .balanceOf(userAddress)
                        .add(variableDebtToken.balanceOf(userAddress))
                        .add(amount) <= reserveLimits.maxIndividualBorrowSize,
                    Errors.AVL_EXCEED_MAX_INDIVIDUAL_BORROW_SIZE
                );
            }
            if (reserveLimits.maxBorrowBps > 0) {
                require(
                    stableDebtToken
                        .totalSupply()
                        .add(variableDebtToken.totalSupply())
                        .add(amount)
                        .mul(10000) <=
                        IERC20(reserve.aTokenAddress).totalSupply().mul(
                            reserveLimits.maxBorrowBps
                        ),
                    Errors.AVL_EXCEED_BORROW_MAX_PERCENTAGE
                );
            }
        }
    }

    /**
     * @dev Validates a repay action
     * @param reserve The reserve state from which the user is repaying
     * @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1)
     * @param onBehalfOf The address of the user msg.sender is repaying for
     * @param stableDebt The borrow balance of the user
     * @param variableDebt The borrow balance of the user
     */
    function validateRepay(
        DataTypes.ReserveData storage reserve,
        uint256 amountSent,
        DataTypes.InterestRateMode rateMode,
        address onBehalfOf,
        uint256 stableDebt,
        uint256 variableDebt
    ) external view {
        bool isActive = reserve.configuration.getActive();

        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);

        require(amountSent > 0, Errors.VL_INVALID_AMOUNT);

        require(
            (stableDebt > 0 &&
                DataTypes.InterestRateMode(rateMode) ==
                DataTypes.InterestRateMode.STABLE) ||
                (variableDebt > 0 &&
                    DataTypes.InterestRateMode(rateMode) ==
                    DataTypes.InterestRateMode.VARIABLE),
            Errors.VL_NO_DEBT_OF_SELECTED_TYPE
        );

        require(
            amountSent != uint256(-1) || msg.sender == onBehalfOf,
            Errors.VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF
        );
    }

    /**
     * @dev Validates a swap of borrow rate mode.
     * @param reserve The reserve state on which the user is swapping the rate
     * @param userConfig The user reserves configuration
     * @param stableDebt The stable debt of the user
     * @param variableDebt The variable debt of the user
     * @param currentRateMode The rate mode of the borrow
     */
    function validateSwapRateMode(
        DataTypes.ReserveData storage reserve,
        DataTypes.UserConfigurationMap storage userConfig,
        uint256 stableDebt,
        uint256 variableDebt,
        DataTypes.InterestRateMode currentRateMode
    ) external view {
        (bool isActive, bool isFrozen, , bool stableRateEnabled) = reserve
            .configuration
            .getFlags();

        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
        require(!isFrozen, Errors.VL_RESERVE_FROZEN);

        if (currentRateMode == DataTypes.InterestRateMode.STABLE) {
            require(stableDebt > 0, Errors.VL_NO_STABLE_RATE_LOAN_IN_RESERVE);
        } else if (currentRateMode == DataTypes.InterestRateMode.VARIABLE) {
            require(
                variableDebt > 0,
                Errors.VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE
            );
            /**
             * user wants to swap to stable, before swapping we need to ensure that
             * 1. stable borrow rate is enabled on the reserve
             * 2. user is not trying to abuse the reserve by depositing
             * more collateral than he is borrowing, artificially lowering
             * the interest rate, borrowing at variable, and switching to stable
             **/
            require(stableRateEnabled, Errors.VL_STABLE_BORROWING_NOT_ENABLED);

            require(
                !userConfig.isUsingAsCollateral(reserve.id) ||
                    reserve.configuration.getLtv() == 0 ||
                    stableDebt.add(variableDebt) >
                    IERC20(reserve.aTokenAddress).balanceOf(msg.sender),
                Errors.VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY
            );
        } else {
            revert(Errors.VL_INVALID_INTEREST_RATE_MODE_SELECTED);
        }
    }

    /**
     * @dev Validates a stable borrow rate rebalance action
     * @param reserve The reserve state on which the user is getting rebalanced
     * @param reserveAddress The address of the reserve
     * @param stableDebtToken The stable debt token instance
     * @param variableDebtToken The variable debt token instance
     * @param aTokenAddress The address of the aToken contract
     */
    function validateRebalanceStableBorrowRate(
        DataTypes.ReserveData storage reserve,
        address reserveAddress,
        IERC20 stableDebtToken,
        IERC20 variableDebtToken,
        address aTokenAddress
    ) external view {
        (bool isActive, , , ) = reserve.configuration.getFlags();

        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);

        //if the usage ratio is below 95%, no rebalances are needed
        uint256 totalDebt = stableDebtToken
            .totalSupply()
            .add(variableDebtToken.totalSupply())
            .wadToRay();
        uint256 availableLiquidity = IERC20(reserveAddress)
            .balanceOf(aTokenAddress)
            .wadToRay();
        uint256 usageRatio = totalDebt == 0
            ? 0
            : totalDebt.rayDiv(availableLiquidity.add(totalDebt));

        //if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage,
        //then we allow rebalancing of the stable rate positions.

        uint256 currentLiquidityRate = reserve.currentLiquidityRate;
        uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(
            reserve.interestRateStrategyAddress
        ).getMaxVariableBorrowRate();

        require(
            usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD &&
                currentLiquidityRate <=
                maxVariableBorrowRate.percentMul(
                    REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD
                ),
            Errors.LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET
        );
    }

    /**
     * @dev Validates the action of setting an asset as collateral
     * @param reserve The state of the reserve that the user is enabling or disabling as collateral
     * @param reserveAddress The address of the reserve
     * @param reservesData The data of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */
    function validateSetUseReserveAsCollateral(
        DataTypes.ReserveData storage reserve,
        address reserveAddress,
        bool useAsCollateral,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        uint256 underlyingBalance = IERC20(reserve.aTokenAddress).balanceOf(
            msg.sender
        );

        require(
            underlyingBalance > 0,
            Errors.VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0
        );

        require(
            useAsCollateral ||
                GenericLogic.balanceDecreaseAllowed(
                    reserveAddress,
                    msg.sender,
                    underlyingBalance,
                    reservesData,
                    userConfig,
                    reserves,
                    reservesCount,
                    oracle
                ),
            Errors.VL_DEPOSIT_ALREADY_IN_USE
        );
    }

    /**
     * @dev Validates a flashloan action
     * @param assets The assets being flashborrowed
     * @param amounts The amounts for each asset being borrowed
     **/
    function validateFlashloan(
        address[] memory assets,
        uint256[] memory amounts
    ) internal pure {
        require(
            assets.length == amounts.length,
            Errors.VL_INCONSISTENT_FLASHLOAN_PARAMS
        );
    }

    /**
     * @dev Validates the liquidation action
     * @param collateralReserve The reserve data of the collateral
     * @param principalReserve The reserve data of the principal
     * @param userConfig The user configuration
     * @param userHealthFactor The user's health factor
     * @param userStableDebt Total stable debt balance of the user
     * @param userVariableDebt Total variable debt balance of the user
     **/
    function validateLiquidationCall(
        DataTypes.ReserveData storage collateralReserve,
        DataTypes.ReserveData storage principalReserve,
        DataTypes.UserConfigurationMap storage userConfig,
        uint256 userHealthFactor,
        uint256 userStableDebt,
        uint256 userVariableDebt
    ) external view returns (uint256, string memory) {
        if (
            !collateralReserve.configuration.getActive() ||
            !principalReserve.configuration.getActive()
        ) {
            return (
                uint256(Errors.CollateralManagerErrors.NO_ACTIVE_RESERVE),
                Errors.VL_NO_ACTIVE_RESERVE
            );
        }

        if (
            userHealthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD
        ) {
            return (
                uint256(
                    Errors.CollateralManagerErrors.HEALTH_FACTOR_ABOVE_THRESHOLD
                ),
                Errors.LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD
            );
        }

        bool isCollateralEnabled = collateralReserve
            .configuration
            .getLiquidationThreshold() >
            0 &&
            userConfig.isUsingAsCollateral(collateralReserve.id);

        //if collateral isn't enabled as collateral by user, it cannot be liquidated
        if (!isCollateralEnabled) {
            return (
                uint256(
                    Errors
                        .CollateralManagerErrors
                        .COLLATERAL_CANNOT_BE_LIQUIDATED
                ),
                Errors.LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED
            );
        }

        if (userStableDebt == 0 && userVariableDebt == 0) {
            return (
                uint256(Errors.CollateralManagerErrors.CURRRENCY_NOT_BORROWED),
                Errors.LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER
            );
        }

        return (
            uint256(Errors.CollateralManagerErrors.NO_ERROR),
            Errors.LPCM_NO_ERRORS
        );
    }

    /**
     * @dev Validates an aToken transfer
     * @param from The user from which the aTokens are being transferred
     * @param reservesData The state of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */
    function validateTransfer(
        address from,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        (, , , , uint256 healthFactor) = GenericLogic.calculateUserAccountData(
            from,
            reservesData,
            userConfig,
            reserves,
            reservesCount,
            oracle
        );

        require(
            healthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
            Errors.VL_TRANSFER_NOT_ALLOWED
        );
    }

    /**
     * @dev Validates limits of an aToken transfer
     * @param from The user from which the aTokens are transferred
     * @param to The user receiving the aTokens
     * @param reserve The reserve object on which the user is depositing
     * @param reserveLimits The reserve limits object on which the user is depositing
     */
    function validateTransferLimits(
        address from,
        address to,
        DataTypes.ReserveData storage reserve,
        DataTypes.ReserveLimits storage reserveLimits
    ) external view {
        if (
            from != IAToken(reserve.aTokenAddress).RESERVE_TREASURY_ADDRESS() &&
            (reserveLimits.maxIndividualDepositSize > 0 ||
                reserveLimits.minIndividualDepositSize > 0)
        ) {
            // verify individual dposit size limit if not coming from treasury
            IERC20 aToken = IERC20(reserve.aTokenAddress);
            if (reserveLimits.maxIndividualDepositSize > 0) {
                // balance of "to" already includes amount transferred in
                // as this validation happens after token transfer function is called
                require(
                    aToken.balanceOf(to) <=
                        reserveLimits.maxIndividualDepositSize,
                    Errors.AVL_EXCEED_MAX_INDIVIDUAL_DEPOSIT_SIZE
                );
            }
            if (reserveLimits.minIndividualDepositSize > 0) {
                // balance of "from" already includes amount transferred out
                // as this validation happens after token transfer function is called
                uint256 balance = aToken.balanceOf(from);
                if (balance > 0) {
                    require(
                        balance >= reserveLimits.minIndividualDepositSize,
                        Errors.AVL_BELOW_MIN_INDIVIDUAL_DEPOSIT_SIZE
                    );
                }
                // balance of "to" is not of concern here even if it is still lower
                // than the minimum limit
            }
        }
    }
}
          

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

import {SafeMath} from "../../../dependencies/openzeppelin/contracts/SafeMath.sol";
import {WadRayMath} from "./WadRayMath.sol";

library MathUtils {
    using SafeMath for uint256;
    using WadRayMath for uint256;

    /// @dev Ignoring leap years
    uint256 internal constant SECONDS_PER_YEAR = 365 days;

    /**
     * @dev Function to calculate the interest accumulated using a linear interest rate formula
     * @param rate The interest rate, in ray
     * @param lastUpdateTimestamp The timestamp of the last update of the interest
     * @return The interest rate linearly accumulated during the timeDelta, in ray
     **/

    function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp)
        internal
        view
        returns (uint256)
    {
        //solium-disable-next-line
        uint256 timeDifference = block.timestamp.sub(
            uint256(lastUpdateTimestamp)
        );

        return
            (rate.mul(timeDifference) / SECONDS_PER_YEAR).add(WadRayMath.ray());
    }

    /**
     * @dev Function to calculate the interest using a compounded interest rate formula
     * To avoid expensive exponentiation, the calculation is performed using a binomial approximation:
     *
     *  (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3...
     *
     * The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions
     * The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods
     *
     * @param rate The interest rate, in ray
     * @param lastUpdateTimestamp The timestamp of the last update of the interest
     * @return The interest rate compounded during the timeDelta, in ray
     **/
    function calculateCompoundedInterest(
        uint256 rate,
        uint40 lastUpdateTimestamp,
        uint256 currentTimestamp
    ) internal pure returns (uint256) {
        //solium-disable-next-line
        uint256 exp = currentTimestamp.sub(uint256(lastUpdateTimestamp));

        if (exp == 0) {
            return WadRayMath.ray();
        }

        uint256 expMinusOne = exp - 1;

        uint256 expMinusTwo = exp > 2 ? exp - 2 : 0;

        uint256 ratePerSecond = rate / SECONDS_PER_YEAR;

        uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
        uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond);

        uint256 secondTerm = exp.mul(expMinusOne).mul(basePowerTwo) / 2;
        uint256 thirdTerm = exp.mul(expMinusOne).mul(expMinusTwo).mul(
            basePowerThree
        ) / 6;

        return
            WadRayMath.ray().add(ratePerSecond.mul(exp)).add(secondTerm).add(
                thirdTerm
            );
    }

    /**
     * @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp
     * @param rate The interest rate (in ray)
     * @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated
     **/
    function calculateCompoundedInterest(
        uint256 rate,
        uint40 lastUpdateTimestamp
    ) internal view returns (uint256) {
        return
            calculateCompoundedInterest(
                rate,
                lastUpdateTimestamp,
                block.timestamp
            );
    }
}
          

// 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;
    }
}
          

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

import {Errors} from "../helpers/Errors.sol";

/**
 * @title WadRayMath library
 * @author Aave
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/

library WadRayMath {
    uint256 internal constant WAD = 1e18;
    uint256 internal constant halfWAD = WAD / 2;

    uint256 internal constant RAY = 1e27;
    uint256 internal constant halfRAY = RAY / 2;

    uint256 internal constant WAD_RAY_RATIO = 1e9;

    /**
     * @return One ray, 1e27
     **/
    function ray() internal pure returns (uint256) {
        return RAY;
    }

    /**
     * @return One wad, 1e18
     **/

    function wad() internal pure returns (uint256) {
        return WAD;
    }

    /**
     * @return Half ray, 1e27/2
     **/
    function halfRay() internal pure returns (uint256) {
        return halfRAY;
    }

    /**
     * @return Half ray, 1e18/2
     **/
    function halfWad() internal pure returns (uint256) {
        return halfWAD;
    }

    /**
     * @dev Multiplies two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a*b, in wad
     **/
    function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }

        require(
            a <= (type(uint256).max - halfWAD) / b,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (a * b + halfWAD) / WAD;
    }

    /**
     * @dev Divides two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a/b, in wad
     **/
    function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        uint256 halfB = b / 2;

        require(
            a <= (type(uint256).max - halfB) / WAD,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (a * WAD + halfB) / b;
    }

    /**
     * @dev Multiplies two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a*b, in ray
     **/
    function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }

        require(
            a <= (type(uint256).max - halfRAY) / b,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (a * b + halfRAY) / RAY;
    }

    /**
     * @dev Divides two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a/b, in ray
     **/
    function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        uint256 halfB = b / 2;

        require(
            a <= (type(uint256).max - halfB) / RAY,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );

        return (a * RAY + halfB) / b;
    }

    /**
     * @dev Casts ray down to wad
     * @param a Ray
     * @return a casted to wad, rounded half up to the nearest wad
     **/
    function rayToWad(uint256 a) internal pure returns (uint256) {
        uint256 halfRatio = WAD_RAY_RATIO / 2;
        uint256 result = halfRatio + a;
        require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);

        return result / WAD_RAY_RATIO;
    }

    /**
     * @dev Converts wad up to ray
     * @param a Wad
     * @return a converted in ray
     **/
    function wadToRay(uint256 a) internal pure returns (uint256) {
        uint256 result = a * WAD_RAY_RATIO;
        require(
            result / WAD_RAY_RATIO == a,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        );
        return result;
    }
}
          

// 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
    }
}