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// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import { ILendingPool } from "@aave/protocol-v2/contracts/interfaces/ILendingPool.sol";
import { IERC20 } from "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/IERC20.sol";

import { IERC20Detailed } from "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/IERC20Detailed.sol";
import { IAToken } from "./IAToken.sol";
import { IStaticATokenLM } from "./IStaticATokenLM.sol";
import { IAaveIncentivesController } from "./IAaveIncentivesController.sol";

import { StaticATokenErrors } from "./StaticATokenErrors.sol";

import { ERC20 } from "./ERC20.sol";
import { ReentrancyGuard } from "./ReentrancyGuard.sol";

import { SafeERC20 } from "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/SafeERC20.sol";
import { WadRayMath } from "@aave/protocol-v2/contracts/protocol/libraries/math/WadRayMath.sol";
import { RayMathNoRounding } from "./RayMathNoRounding.sol";
import { SafeMath } from "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/SafeMath.sol";

/**
 * @title StaticATokenLM
 * @notice Wrapper token that allows to deposit tokens on the Aave protocol and receive
 * a token which balance doesn't increase automatically, but uses an ever-increasing exchange rate.
 * The token support claiming liquidity mining rewards from the Aave system.
 * @author Aave
 **/
contract StaticATokenLM is
    ReentrancyGuard,
    ERC20("STATIC_ATOKEN_IMPL", "STATIC_ATOKEN_IMPL"),
    IStaticATokenLM
{
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using RayMathNoRounding for uint256;

    bytes public constant EIP712_REVISION = bytes("1");
    bytes32 internal constant EIP712_DOMAIN =
        keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );
    bytes32 public constant METADEPOSIT_TYPEHASH =
        keccak256(
            "Deposit(address depositor,address recipient,uint256 value,uint16 referralCode,bool fromUnderlying,uint256 nonce,uint256 deadline)"
        );
    bytes32 public constant METAWITHDRAWAL_TYPEHASH =
        keccak256(
            "Withdraw(address owner,address recipient,uint256 staticAmount,uint256 dynamicAmount,bool toUnderlying,uint256 nonce,uint256 deadline)"
        );

    uint256 public constant STATIC_ATOKEN_LM_REVISION = 0x1;

    ILendingPool public override LENDING_POOL;
    IAaveIncentivesController public override INCENTIVES_CONTROLLER;
    IERC20 public override ATOKEN;
    IERC20 public override ASSET;
    IERC20 public override REWARD_TOKEN;

    mapping(address => uint256) public _nonces;

    uint256 internal _accRewardsPerToken;
    uint256 internal _lifetimeRewardsClaimed;
    uint256 internal _lifetimeRewards;
    uint256 internal _lastRewardBlock;

    // user => _accRewardsPerToken at last interaction (in RAYs)
    mapping(address => uint256) private _userSnapshotRewardsPerToken;
    // user => unclaimedRewards (in RAYs)
    mapping(address => uint256) private _unclaimedRewards;

    constructor(
        ILendingPool pool,
        address aToken,
        string memory staticATokenName,
        string memory staticATokenSymbol
    ) public {
        LENDING_POOL = pool;
        ATOKEN = IERC20(aToken);

        _name = staticATokenName;
        _symbol = staticATokenSymbol;
        _setupDecimals(IERC20Detailed(aToken).decimals());

        try IAToken(aToken).getIncentivesController() returns (
            IAaveIncentivesController incentivesController
        ) {
            if (address(incentivesController) != address(0)) {
                INCENTIVES_CONTROLLER = incentivesController;
                REWARD_TOKEN = IERC20(INCENTIVES_CONTROLLER.REWARD_TOKEN());
            }
        } catch {}

        ASSET = IERC20(IAToken(aToken).UNDERLYING_ASSET_ADDRESS());
        ASSET.safeApprove(address(pool), type(uint256).max);
    }

    ///@inheritdoc IStaticATokenLM
    function deposit(
        address recipient,
        uint256 amount,
        uint16 referralCode,
        bool fromUnderlying
    ) external override nonReentrant returns (uint256) {
        return _deposit(msg.sender, recipient, amount, referralCode, fromUnderlying);
    }

    ///@inheritdoc IStaticATokenLM
    function withdraw(
        address recipient,
        uint256 amount,
        bool toUnderlying
    ) external override nonReentrant returns (uint256, uint256) {
        return _withdraw(msg.sender, recipient, amount, 0, toUnderlying);
    }

    ///@inheritdoc IStaticATokenLM
    function withdrawDynamicAmount(
        address recipient,
        uint256 amount,
        bool toUnderlying
    ) external override nonReentrant returns (uint256, uint256) {
        return _withdraw(msg.sender, recipient, 0, amount, toUnderlying);
    }

    ///@inheritdoc IStaticATokenLM
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(owner != address(0), StaticATokenErrors.INVALID_OWNER);
        //solium-disable-next-line
        require(block.timestamp <= deadline, StaticATokenErrors.INVALID_EXPIRATION);
        uint256 currentValidNonce = _nonces[owner];
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                getDomainSeparator(),
                keccak256(
                    abi.encode(PERMIT_TYPEHASH, owner, spender, value, currentValidNonce, deadline)
                )
            )
        );
        require(owner == ecrecover(digest, v, r, s), StaticATokenErrors.INVALID_SIGNATURE);
        _nonces[owner] = currentValidNonce.add(1);
        _approve(owner, spender, value);
    }

    ///@inheritdoc IStaticATokenLM
    function metaDeposit(
        address depositor,
        address recipient,
        uint256 value,
        uint16 referralCode,
        bool fromUnderlying,
        uint256 deadline,
        SignatureParams calldata sigParams
    ) external override nonReentrant returns (uint256) {
        require(depositor != address(0), StaticATokenErrors.INVALID_DEPOSITOR);
        //solium-disable-next-line
        require(block.timestamp <= deadline, StaticATokenErrors.INVALID_EXPIRATION);
        uint256 currentValidNonce = _nonces[depositor];
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                getDomainSeparator(),
                keccak256(
                    abi.encode(
                        METADEPOSIT_TYPEHASH,
                        depositor,
                        recipient,
                        value,
                        referralCode,
                        fromUnderlying,
                        currentValidNonce,
                        deadline
                    )
                )
            )
        );
        require(
            depositor == ecrecover(digest, sigParams.v, sigParams.r, sigParams.s),
            StaticATokenErrors.INVALID_SIGNATURE
        );
        _nonces[depositor] = currentValidNonce.add(1);
        return _deposit(depositor, recipient, value, referralCode, fromUnderlying);
    }

    ///@inheritdoc IStaticATokenLM
    function metaWithdraw(
        address owner,
        address recipient,
        uint256 staticAmount,
        uint256 dynamicAmount,
        bool toUnderlying,
        uint256 deadline,
        SignatureParams calldata sigParams
    ) external override nonReentrant returns (uint256, uint256) {
        require(owner != address(0), StaticATokenErrors.INVALID_OWNER);
        //solium-disable-next-line
        require(block.timestamp <= deadline, StaticATokenErrors.INVALID_EXPIRATION);
        uint256 currentValidNonce = _nonces[owner];
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                getDomainSeparator(),
                keccak256(
                    abi.encode(
                        METAWITHDRAWAL_TYPEHASH,
                        owner,
                        recipient,
                        staticAmount,
                        dynamicAmount,
                        toUnderlying,
                        currentValidNonce,
                        deadline
                    )
                )
            )
        );

        require(
            owner == ecrecover(digest, sigParams.v, sigParams.r, sigParams.s),
            StaticATokenErrors.INVALID_SIGNATURE
        );
        _nonces[owner] = currentValidNonce.add(1);
        return _withdraw(owner, recipient, staticAmount, dynamicAmount, toUnderlying);
    }

    ///@inheritdoc IStaticATokenLM
    function dynamicBalanceOf(address account) external view override returns (uint256) {
        return _staticToDynamicAmount(balanceOf(account), rate());
    }

    ///@inheritdoc IStaticATokenLM
    function staticToDynamicAmount(uint256 amount) external view override returns (uint256) {
        return _staticToDynamicAmount(amount, rate());
    }

    ///@inheritdoc IStaticATokenLM
    function dynamicToStaticAmount(uint256 amount) external view override returns (uint256) {
        return _dynamicToStaticAmount(amount, rate());
    }

    ///@inheritdoc IStaticATokenLM
    function rate() public view override returns (uint256) {
        return LENDING_POOL.getReserveNormalizedIncome(address(ASSET));
    }

    ///@inheritdoc IStaticATokenLM
    function getDomainSeparator() public view override returns (bytes32) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return
            keccak256(
                abi.encode(
                    EIP712_DOMAIN,
                    keccak256(bytes(name())),
                    keccak256(EIP712_REVISION),
                    chainId,
                    address(this)
                )
            );
    }

    function _dynamicToStaticAmount(uint256 amount, uint256 rate_) internal pure returns (uint256) {
        return amount.rayDiv(rate_);
    }

    function _staticToDynamicAmount(uint256 amount, uint256 rate_) internal pure returns (uint256) {
        return amount.rayMul(rate_);
    }

    function _deposit(
        address depositor,
        address recipient,
        uint256 amount,
        uint16 referralCode,
        bool fromUnderlying
    ) internal returns (uint256) {
        require(recipient != address(0), StaticATokenErrors.INVALID_RECIPIENT);
        _updateRewards();

        if (fromUnderlying) {
            ASSET.safeTransferFrom(depositor, address(this), amount);
            LENDING_POOL.deposit(address(ASSET), amount, address(this), referralCode);
        } else {
            ATOKEN.safeTransferFrom(depositor, address(this), amount);
        }

        uint256 amountToMint = _dynamicToStaticAmount(amount, rate());
        _mint(recipient, amountToMint);

        return amountToMint;
    }

    function _withdraw(
        address owner,
        address recipient,
        uint256 staticAmount,
        uint256 dynamicAmount,
        bool toUnderlying
    ) internal returns (uint256, uint256) {
        require(recipient != address(0), StaticATokenErrors.INVALID_RECIPIENT);
        require(
            staticAmount == 0 || dynamicAmount == 0,
            StaticATokenErrors.ONLY_ONE_AMOUNT_FORMAT_ALLOWED
        );
        _updateRewards();

        uint256 userBalance = balanceOf(owner);

        uint256 amountToWithdraw;
        uint256 amountToBurn;

        uint256 currentRate = rate();
        if (staticAmount > 0) {
            amountToBurn = (staticAmount > userBalance) ? userBalance : staticAmount;
            amountToWithdraw = _staticToDynamicAmount(amountToBurn, currentRate);
        } else {
            uint256 dynamicUserBalance = _staticToDynamicAmount(userBalance, currentRate);
            amountToWithdraw = (dynamicAmount > dynamicUserBalance)
                ? dynamicUserBalance
                : dynamicAmount;
            amountToBurn = _dynamicToStaticAmount(amountToWithdraw, currentRate);
        }

        _burn(owner, amountToBurn);

        if (toUnderlying) {
            uint256 amt = LENDING_POOL.withdraw(address(ASSET), amountToWithdraw, recipient);
            assert(amt == amountToWithdraw);
        } else {
            ATOKEN.safeTransfer(recipient, amountToWithdraw);
        }

        return (amountToBurn, amountToWithdraw);
    }

    /**
     * @notice Updates rewards for senders and receiver in a transfer (not updating rewards for address(0))
     * @param from The address of the sender of tokens
     * @param to The address of the receiver of tokens
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256
    ) internal override {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }
        if (from != address(0)) {
            _updateUser(from);
        }
        if (to != address(0)) {
            _updateUser(to);
        }
    }

    /**
     * @notice Updates virtual internal accounting of rewards.
     */
    function _updateRewards() internal {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }
        if (block.number > _lastRewardBlock) {
            _lastRewardBlock = block.number;
            uint256 supply = totalSupply();
            if (supply == 0) {
                // No rewards can have accrued since last because there were no funds.
                return;
            }

            address[] memory assets = new address[](1);
            assets[0] = address(ATOKEN);

            uint256 freshRewards = INCENTIVES_CONTROLLER.getRewardsBalance(assets, address(this));
            uint256 lifetimeRewards = _lifetimeRewardsClaimed.add(freshRewards);
            uint256 rewardsAccrued = lifetimeRewards.sub(_lifetimeRewards).wadToRay();

            _accRewardsPerToken = _accRewardsPerToken.add(
                (rewardsAccrued).rayDivNoRounding(supply.wadToRay())
            );
            _lifetimeRewards = lifetimeRewards;
        }
    }

    function _collectAndUpdateRewards() internal {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }

        _lastRewardBlock = block.number;
        uint256 supply = totalSupply();

        address[] memory assets = new address[](1);
        assets[0] = address(ATOKEN);

        uint256 freshlyClaimed = INCENTIVES_CONTROLLER.claimRewards(
            assets,
            type(uint256).max,
            address(this)
        );
        uint256 lifetimeRewards = _lifetimeRewardsClaimed.add(freshlyClaimed);
        uint256 rewardsAccrued = lifetimeRewards.sub(_lifetimeRewards).wadToRay();

        if (supply > 0 && rewardsAccrued > 0) {
            _accRewardsPerToken = _accRewardsPerToken.add(
                (rewardsAccrued).rayDivNoRounding(supply.wadToRay())
            );
        }

        if (rewardsAccrued > 0) {
            _lifetimeRewards = lifetimeRewards;
        }

        _lifetimeRewardsClaimed = lifetimeRewards;
    }

    ///@inheritdoc IStaticATokenLM
    function collectAndUpdateRewards() external override nonReentrant {
        _collectAndUpdateRewards();
    }

    /**
     * @notice Claim rewards on behalf of a user and send them to a receiver
     * @param onBehalfOf The address to claim on behalf of
     * @param receiver The address to receive the rewards
     * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
     */
    function _claimRewardsOnBehalf(
        address onBehalfOf,
        address receiver,
        bool forceUpdate
    ) internal {
        if (forceUpdate) {
            _collectAndUpdateRewards();
        }

        uint256 balance = balanceOf(onBehalfOf);
        uint256 reward = _getClaimableRewards(onBehalfOf, balance, false);
        uint256 totBal = REWARD_TOKEN.balanceOf(address(this));
        if (reward > totBal) {
            reward = totBal;
        }
        if (reward > 0) {
            _unclaimedRewards[onBehalfOf] = 0;
            _updateUserSnapshotRewardsPerToken(onBehalfOf);
            REWARD_TOKEN.safeTransfer(receiver, reward);
        }
    }

    function claimRewardsOnBehalf(
        address onBehalfOf,
        address receiver,
        bool forceUpdate
    ) external override nonReentrant {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }

        require(
            msg.sender == onBehalfOf || msg.sender == INCENTIVES_CONTROLLER.getClaimer(onBehalfOf),
            StaticATokenErrors.INVALID_CLAIMER
        );
        _claimRewardsOnBehalf(onBehalfOf, receiver, forceUpdate);
    }

    function claimRewards(address receiver, bool forceUpdate) external override nonReentrant {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }
        _claimRewardsOnBehalf(msg.sender, receiver, forceUpdate);
    }

    function claimRewardsToSelf(bool forceUpdate) external override nonReentrant {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return;
        }
        _claimRewardsOnBehalf(msg.sender, msg.sender, forceUpdate);
    }

    /**
     * @notice Update the rewardDebt for a user with balance as his balance
     * @param user The user to update
     */
    function _updateUserSnapshotRewardsPerToken(address user) internal {
        _userSnapshotRewardsPerToken[user] = _accRewardsPerToken;
    }

    /**
     * @notice Adding the pending rewards to the unclaimed for specific user and updating user index
     * @param user The address of the user to update
     */
    function _updateUser(address user) internal {
        uint256 balance = balanceOf(user);
        if (balance > 0) {
            uint256 pending = _getPendingRewards(user, balance, false);
            _unclaimedRewards[user] = _unclaimedRewards[user].add(pending);
        }
        _updateUserSnapshotRewardsPerToken(user);
    }

    /**
     * @notice Compute the pending in RAY (rounded down). Pending is the amount to add (not yet unclaimed) rewards in RAY (rounded down).
     * @param user The user to compute for
     * @param balance The balance of the user
     * @param fresh Flag to account for rewards not claimed by contract yet
     * @return The amound of pending rewards in RAY
     */
    function _getPendingRewards(
        address user,
        uint256 balance,
        bool fresh
    ) internal view returns (uint256) {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return 0;
        }

        if (balance == 0) {
            return 0;
        }

        uint256 rayBalance = balance.wadToRay();

        uint256 supply = totalSupply();
        uint256 accRewardsPerToken = _accRewardsPerToken;

        if (supply != 0 && fresh) {
            address[] memory assets = new address[](1);
            assets[0] = address(ATOKEN);

            uint256 freshReward = INCENTIVES_CONTROLLER.getRewardsBalance(assets, address(this));
            uint256 lifetimeRewards = _lifetimeRewardsClaimed.add(freshReward);
            uint256 rewardsAccrued = lifetimeRewards.sub(_lifetimeRewards).wadToRay();
            accRewardsPerToken = accRewardsPerToken.add(
                (rewardsAccrued).rayDivNoRounding(supply.wadToRay())
            );
        }

        return
            rayBalance.rayMulNoRounding(accRewardsPerToken.sub(_userSnapshotRewardsPerToken[user]));
    }

    /**
     * @notice Compute the claimable rewards for a user
     * @param user The address of the user
     * @param balance The balance of the user in WAD
     * @param fresh Flag to account for rewards not claimed by contract yet
     * @return The total rewards that can be claimed by the user (if `fresh` flag true, after updating rewards)
     */
    function _getClaimableRewards(
        address user,
        uint256 balance,
        bool fresh
    ) internal view returns (uint256) {
        uint256 reward = _unclaimedRewards[user].add(_getPendingRewards(user, balance, fresh));
        return reward.rayToWadNoRounding();
    }

    ///@inheritdoc IStaticATokenLM
    function getTotalClaimableRewards() external view override returns (uint256) {
        if (address(INCENTIVES_CONTROLLER) == address(0)) {
            return 0;
        }

        address[] memory assets = new address[](1);
        assets[0] = address(ATOKEN);
        uint256 freshRewards = INCENTIVES_CONTROLLER.getRewardsBalance(assets, address(this));
        return REWARD_TOKEN.balanceOf(address(this)).add(freshRewards);
    }

    ///@inheritdoc IStaticATokenLM
    function getClaimableRewards(address user) external view override returns (uint256) {
        return _getClaimableRewards(user, balanceOf(user), true);
    }

    ///@inheritdoc IStaticATokenLM
    function getUnclaimedRewards(address user) external view override returns (uint256) {
        return _unclaimedRewards[user].rayToWadNoRounding();
    }

    function getAccRewardsPerToken() external view override returns (uint256) {
        return _accRewardsPerToken;
    }

    function getLifetimeRewardsClaimed() external view override returns (uint256) {
        return _lifetimeRewardsClaimed;
    }

    function getLifetimeRewards() external view override returns (uint256) {
        return _lifetimeRewards;
    }

    function getLastRewardBlock() external view override returns (uint256) {
        return _lastRewardBlock;
    }

    function getIncentivesController() external view override returns (IAaveIncentivesController) {
        return INCENTIVES_CONTROLLER;
    }

    function UNDERLYING_ASSET_ADDRESS() external view override returns (address) {
        return address(ASSET);
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      codehash := extcodehash(account)
    }
    return (codehash != accountHash && codehash != 0x0);
  }

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

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

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

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

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

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @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: agpl-3.0
pragma solidity 0.6.12;

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

interface IERC20Detailed is IERC20 {
  function name() external view returns (string memory);

  function symbol() external view returns (string memory);

  function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

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

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

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

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

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    require(
      (value == 0) || (token.allowance(address(this), spender) == 0),
      'SafeERC20: approve from non-zero to non-zero allowance'
    );
    callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
  }

  function callOptionalReturn(IERC20 token, bytes memory data) private {
    require(address(token).isContract(), 'SafeERC20: call to non-contract');

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = address(token).call(data);
    require(success, 'SafeERC20: low-level call failed');

    if (returndata.length > 0) {
      // Return data is optional
      // solhint-disable-next-line max-line-length
      require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
    }
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, 'SafeMath: addition overflow');

    return c;
  }

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

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

    return c;
  }

  /**
   * @dev Returns the multiplication of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `*` operator.
   *
   * Requirements:
   * - Multiplication cannot overflow.
   */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, 'SafeMath: multiplication overflow');

    return c;
  }

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

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

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

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

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
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 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
  );

  /**
   * @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);

  /**
   * @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 modes Types of the debt to open if the flash loan is not returned:
   *   0 -> Don't open any debt, just revert if funds can't be transferred from the receiver
   *   1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   *   2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   * @param onBehalfOf The address  that will receive the debt in the case of using on `modes` 1 or 2
   * @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,
    uint256[] calldata modes,
    address onBehalfOf,
    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;

  /**
   * @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);

  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);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @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 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;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

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 0.6.12;

/**
 * @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
 *  - 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';

  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 0.6.12;

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 0.6.12;

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 UserConfigurationMap {
    uint256 data;
  }

  enum InterestRateMode {NONE, STABLE, VARIABLE}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/Context.sol";
import "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/IERC20.sol";
import "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/SafeMath.sol";
import "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/Address.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string internal _name;
    string internal _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

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

    event RewardsClaimed(address indexed user, address indexed to, uint256 amount);

    event RewardsClaimed(
        address indexed user,
        address indexed to,
        address indexed claimer,
        uint256 amount
    );

    event ClaimerSet(address indexed user, address indexed claimer);

    /*
     * @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
        );

    /**
     * @dev Whitelists an address to claim the rewards on behalf of another address
     * @param user The address of the user
     * @param claimer The address of the claimer
     */
    function setClaimer(address user, address claimer) external;

    /**
     * @dev Returns the whitelisted claimer for a certain address (0x0 if not set)
     * @param user The address of the user
     * @return The claimer address
     */
    function getClaimer(address user) external view returns (address);

    /**
     * @dev Configure assets for a certain rewards emission
     * @param assets The assets to incentivize
     * @param emissionsPerSecond The emission for each asset
     */
    function configureAssets(address[] calldata assets, uint256[] calldata emissionsPerSecond)
        external;

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

    /**
     * @dev Returns the total of rewards of an user, already accrued + not yet accrued
     * @param user The address of the user
     * @return The rewards
     **/
    function getRewardsBalance(address[] calldata assets, address user)
        external
        view
        returns (uint256);

    /**
     * @dev Claims reward for an user, on all the assets of the lending pool, accumulating the pending rewards
     * @param amount Amount of rewards to claim
     * @param to Address that will be receiving the rewards
     * @return Rewards claimed
     **/
    function claimRewards(
        address[] calldata assets,
        uint256 amount,
        address to
    ) external returns (uint256);

    /**
     * @dev Claims reward for an user on behalf, on all the assets of the lending pool, accumulating the pending rewards. The caller must
     * be whitelisted via "allowClaimOnBehalf" function by the RewardsAdmin role manager
     * @param amount Amount of rewards to claim
     * @param user Address to check and claim rewards
     * @param to Address that will be receiving the rewards
     * @return Rewards claimed
     **/
    function claimRewardsOnBehalf(
        address[] calldata assets,
        uint256 amount,
        address user,
        address to
    ) external returns (uint256);

    /**
     * @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 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);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/IERC20.sol";
import "@aave/protocol-v2/contracts/interfaces/IScaledBalanceToken.sol";
import "./IAaveIncentivesController.sol";

interface IAToken is IERC20, IScaledBalanceToken {
    /**
     * @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 (IAaveIncentivesController);

    /**
     * @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 0.6.12;
pragma experimental ABIEncoderV2;

import { IERC20 } from "@aave/protocol-v2/contracts/dependencies/openzeppelin/contracts/IERC20.sol";
import { ILendingPool } from "@aave/protocol-v2/contracts/interfaces/ILendingPool.sol";
import { IAaveIncentivesController } from "./IAaveIncentivesController.sol";

interface IStaticATokenLM is IERC20 {
    struct SignatureParams {
        uint8 v;
        bytes32 r;
        bytes32 s;
    }

    /**
     * @notice Deposits `ASSET` in the Aave protocol and mints static aTokens to msg.sender
     * @param recipient The address that will receive the static aTokens
     * @param amount The amount of underlying `ASSET` to deposit (e.g. deposit of 100 USDC)
     * @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 fromUnderlying bool
     * - `true` if the msg.sender comes with underlying tokens (e.g. USDC)
     * - `false` if the msg.sender comes already with aTokens (e.g. aUSDC)
     * @return uint256 The amount of StaticAToken minted, static balance
     **/
    function deposit(
        address recipient,
        uint256 amount,
        uint16 referralCode,
        bool fromUnderlying
    ) external returns (uint256);

    /**
     * @notice Burns `amount` of static aToken, with recipient receiving the corresponding amount of `ASSET`
     * @param recipient The address that will receive the amount of `ASSET` withdrawn from the Aave protocol
     * @param amount The amount to withdraw, in static balance of StaticAToken
     * @param toUnderlying bool
     * - `true` for the recipient to get underlying tokens (e.g. USDC)
     * - `false` for the recipient to get aTokens (e.g. aUSDC)
     * @return amountToBurn: StaticATokens burnt, static balance
     * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
     **/
    function withdraw(
        address recipient,
        uint256 amount,
        bool toUnderlying
    ) external returns (uint256, uint256);

    /**
     * @notice Burns `amount` of static aToken, with recipient receiving the corresponding amount of `ASSET`
     * @param recipient The address that will receive the amount of `ASSET` withdrawn from the Aave protocol
     * @param amount The amount to withdraw, in dynamic balance of aToken/underlying asset
     * @param toUnderlying bool
     * - `true` for the recipient to get underlying tokens (e.g. USDC)
     * - `false` for the recipient to get aTokens (e.g. aUSDC)
     * @return amountToBurn: StaticATokens burnt, static balance
     * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
     **/
    function withdrawDynamicAmount(
        address recipient,
        uint256 amount,
        bool toUnderlying
    ) external returns (uint256, uint256);

    /**
     * @notice Implements the permit function as for
     * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
     * @param owner The owner of the funds
     * @param spender The spender
     * @param value The amount
     * @param deadline The deadline timestamp, type(uint256).max for max deadline
     * @param v Signature param
     * @param s Signature param
     * @param r Signature param
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Allows to deposit on Aave via meta-transaction
     * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
     * @param depositor Address from which the funds to deposit are going to be pulled
     * @param recipient Address that will receive the staticATokens, in the average case, same as the `depositor`
     * @param value The amount to deposit
     * @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 fromUnderlying bool
     * - `true` if the msg.sender comes with underlying tokens (e.g. USDC)
     * - `false` if the msg.sender comes already with aTokens (e.g. aUSDC)
     * @param deadline The deadline timestamp, type(uint256).max for max deadline
     * @param sigParams Signature params: v,r,s
     * @return uint256 The amount of StaticAToken minted, static balance
     */
    function metaDeposit(
        address depositor,
        address recipient,
        uint256 value,
        uint16 referralCode,
        bool fromUnderlying,
        uint256 deadline,
        SignatureParams calldata sigParams
    ) external returns (uint256);

    /**
     * @notice Allows to withdraw from Aave via meta-transaction
     * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
     * @param owner Address owning the staticATokens
     * @param recipient Address that will receive the underlying withdrawn from Aave
     * @param staticAmount The amount of staticAToken to withdraw. If > 0, `dynamicAmount` needs to be 0
     * @param dynamicAmount The amount of underlying/aToken to withdraw. If > 0, `staticAmount` needs to be 0
     * @param toUnderlying bool
     * - `true` for the recipient to get underlying tokens (e.g. USDC)
     * - `false` for the recipient to get aTokens (e.g. aUSDC)
     * @param deadline The deadline timestamp, type(uint256).max for max deadline
     * @param sigParams Signature params: v,r,s
     * @return amountToBurn: StaticATokens burnt, static balance
     * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
     */
    function metaWithdraw(
        address owner,
        address recipient,
        uint256 staticAmount,
        uint256 dynamicAmount,
        bool toUnderlying,
        uint256 deadline,
        SignatureParams calldata sigParams
    ) external returns (uint256, uint256);

    /**
     * @notice Utility method to get the current aToken balance of an user, from his staticAToken balance
     * @param account The address of the user
     * @return uint256 The aToken balance
     **/
    function dynamicBalanceOf(address account) external view returns (uint256);

    /**
     * @notice Converts a static amount (scaled balance on aToken) to the aToken/underlying value,
     * using the current liquidity index on Aave
     * @param amount The amount to convert from
     * @return uint256 The dynamic amount
     **/
    function staticToDynamicAmount(uint256 amount) external view returns (uint256);

    /**
     * @notice Converts an aToken or underlying amount to the what it is denominated on the aToken as
     * scaled balance, function of the principal and the liquidity index
     * @param amount The amount to convert from
     * @return uint256 The static (scaled) amount
     **/
    function dynamicToStaticAmount(uint256 amount) external view returns (uint256);

    /**
     * @notice Returns the Aave liquidity index of the underlying aToken, denominated rate here
     * as it can be considered as an ever-increasing exchange rate
     * @return The liquidity index
     **/
    function rate() external view returns (uint256);

    /**
     * @notice Function to return a dynamic domain separator, in order to be compatible with forks changing chainId
     * @return bytes32 The domain separator
     **/
    function getDomainSeparator() external view returns (bytes32);

    /**
     * @notice Claims rewards from `INCENTIVES_CONTROLLER` and updates internal accounting of rewards.
     */
    function collectAndUpdateRewards() external;

    /**
     * @notice Claim rewards on behalf of a user and send them to a receiver
     * @dev Only callable by if sender is onBehalfOf or sender is approved claimer
     * @param onBehalfOf The address to claim on behalf of
     * @param receiver The address to receive the rewards
     * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
     */
    function claimRewardsOnBehalf(
        address onBehalfOf,
        address receiver,
        bool forceUpdate
    ) external;

    /**
     * @notice Claim rewards and send them to a receiver
     * @param receiver The address to receive the rewards
     * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
     */
    function claimRewards(address receiver, bool forceUpdate) external;

    /**
     * @notice Claim rewards
     * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
     */
    function claimRewardsToSelf(bool forceUpdate) external;

    /**
     * @notice Get the total claimable rewards of the contract.
     * @return The current balance + pending rewards from the `_incentivesController`
     */
    function getTotalClaimableRewards() external view returns (uint256);

    /**
     * @notice Get the total claimable rewards for a user in WAD
     * @param user The address of the user
     * @return The claimable amount of rewards in WAD
     */
    function getClaimableRewards(address user) external view returns (uint256);

    /**
     * @notice The unclaimed rewards for a user in WAD
     * @param user The address of the user
     * @return The unclaimed amount of rewards in WAD
     */
    function getUnclaimedRewards(address user) external view returns (uint256);

    function getAccRewardsPerToken() external view returns (uint256);

    function getLifetimeRewardsClaimed() external view returns (uint256);

    function getLifetimeRewards() external view returns (uint256);

    function getLastRewardBlock() external view returns (uint256);

    function LENDING_POOL() external view returns (ILendingPool);

    function INCENTIVES_CONTROLLER() external view returns (IAaveIncentivesController);

    function ATOKEN() external view returns (IERC20);

    function ASSET() external view returns (IERC20);

    function REWARD_TOKEN() external view returns (IERC20);

    function UNDERLYING_ASSET_ADDRESS() external view returns (address);

    function getIncentivesController() external view returns (IAaveIncentivesController);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import { Errors } from "@aave/protocol-v2/contracts/protocol/libraries/helpers/Errors.sol";

library RayMathNoRounding {
    uint256 internal constant RAY = 1e27;
    uint256 internal constant WAD_RAY_RATIO = 1e9;

    function rayMulNoRounding(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }
        require(a <= type(uint256).max / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
        return (a * b) / RAY;
    }

    function rayDivNoRounding(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        require(a <= (type(uint256).max) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
        return (a * RAY) / b;
    }

    function rayToWadNoRounding(uint256 a) internal pure returns (uint256) {
        return a / WAD_RAY_RATIO;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

library StaticATokenErrors {
    string public constant INVALID_OWNER = "1";
    string public constant INVALID_EXPIRATION = "2";
    string public constant INVALID_SIGNATURE = "3";
    string public constant INVALID_DEPOSITOR = "4";
    string public constant INVALID_RECIPIENT = "5";
    string public constant INVALID_CLAIMER = "6";
    string public constant ONLY_ONE_AMOUNT_FORMAT_ALLOWED = "7";
}

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

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