// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/math/SafeMath.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, 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) {
        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;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


pragma solidity >=0.6.0 <0.8.0;




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

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

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

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

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

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

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

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

// File: contracts/interface/IProxy.sol

pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;

interface IProxy {
    function batchExec(address[] calldata tos, bytes32[] calldata configs, bytes[] memory datas) external payable;
    function execs(address[] calldata tos, bytes32[] calldata configs, bytes[] memory datas) external payable;
}

// File: contracts/interface/IERC20Usdt.sol

pragma solidity ^0.6.0;

interface IERC20Usdt {
    function totalSupply() external view returns (uint256);

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

    function transfer(address recipient, uint256 amount) external;

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

    function approve(address spender, uint256 amount) external;

    function transferFrom(address sender, address recipient, uint256 amount) external;

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/Config.sol

pragma solidity ^0.6.0;

contract Config {
    // function signature of "postProcess()"
    bytes4 public constant POSTPROCESS_SIG = 0xc2722916;

    // The base amount of percentage function
    uint256 public constant PERCENTAGE_BASE = 1 ether;

    // Handler post-process type. Others should not happen now.
    enum HandlerType {Token, Custom, Others}
}

// File: contracts/lib/LibCache.sol

pragma solidity ^0.6.0;

library LibCache {
    function set(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        bytes32 _value
    ) internal {
        _cache[_key] = _value;
    }

    function setAddress(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        address _value
    ) internal {
        _cache[_key] = bytes32(uint256(uint160(_value)));
    }

    function setUint256(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        uint256 _value
    ) internal {
        _cache[_key] = bytes32(_value);
    }

    function getAddress(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key
    ) internal view returns (address ret) {
        ret = address(uint160(uint256(_cache[_key])));
    }

    function getUint256(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key
    ) internal view returns (uint256 ret) {
        ret = uint256(_cache[_key]);
    }

    function get(mapping(bytes32 => bytes32) storage _cache, bytes32 _key)
        internal
        view
        returns (bytes32 ret)
    {
        ret = _cache[_key];
    }
}

// File: contracts/lib/LibStack.sol

pragma solidity ^0.6.0;


library LibStack {
    function setAddress(bytes32[] storage _stack, address _input) internal {
        _stack.push(bytes32(uint256(uint160(_input))));
    }

    function set(bytes32[] storage _stack, bytes32 _input) internal {
        _stack.push(_input);
    }

    function setHandlerType(bytes32[] storage _stack, Config.HandlerType _input)
        internal
    {
        _stack.push(bytes12(uint96(_input)));
    }

    function getAddress(bytes32[] storage _stack)
        internal
        returns (address ret)
    {
        ret = address(uint160(uint256(peek(_stack))));
        _stack.pop();
    }

    function getSig(bytes32[] storage _stack) internal returns (bytes4 ret) {
        ret = bytes4(peek(_stack));
        _stack.pop();
    }

    function get(bytes32[] storage _stack) internal returns (bytes32 ret) {
        ret = peek(_stack);
        _stack.pop();
    }

    function peek(bytes32[] storage _stack)
        internal
        view
        returns (bytes32 ret)
    {
        require(_stack.length > 0, "stack empty");
        ret = _stack[_stack.length - 1];
    }
}

// File: contracts/Storage.sol

pragma solidity ^0.6.0;



/// @notice A cache structure composed by a bytes32 array
contract Storage {
    using LibCache for mapping(bytes32 => bytes32);
    using LibStack for bytes32[];

    bytes32[] public stack;
    mapping(bytes32 => bytes32) public cache;

    // keccak256 hash of "msg.sender"
    // prettier-ignore
    bytes32 public constant MSG_SENDER_KEY = 0xb2f2618cecbbb6e7468cc0f2aa43858ad8d153e0280b22285e28e853bb9d453a;

    // keccak256 hash of "cube.counter"
    // prettier-ignore
    bytes32 public constant CUBE_COUNTER_KEY = 0xf9543f11459ccccd21306c8881aaab675ff49d988c1162fd1dd9bbcdbe4446be;

    modifier isStackEmpty() {
        require(stack.length == 0, "Stack not empty");
        _;
    }

    modifier isCubeCounterZero() {
        require(_getCubeCounter() == 0, "Cube counter not zero");
        _;
    }

    modifier isInitialized() {
        require(_getSender() != address(0), "Sender is not initialized");
        _;
    }

    modifier isNotInitialized() {
        require(_getSender() == address(0), "Sender is initialized");
        _;
    }

    function _setSender() internal isNotInitialized {
        cache.setAddress(MSG_SENDER_KEY, msg.sender);
    }

    function _resetSender() internal {
        cache.setAddress(MSG_SENDER_KEY, address(0));
    }

    function _getSender() internal view returns (address) {
        return cache.getAddress(MSG_SENDER_KEY);
    }

    function _addCubeCounter() internal {
        cache.setUint256(CUBE_COUNTER_KEY, _getCubeCounter() + 1);
    }

    function _resetCubeCounter() internal {
        cache.setUint256(CUBE_COUNTER_KEY, 0);
    }

    function _getCubeCounter() internal view returns (uint256) {
        return cache.getUint256(CUBE_COUNTER_KEY);
    }
}

// File: contracts/handlers/HandlerBase.sol

pragma solidity ^0.6.0;





abstract contract HandlerBase is Storage, Config {
    using SafeERC20 for IERC20;

    function postProcess() external payable virtual {
        revert("Invalid post process");
        /* Implementation template
        bytes4 sig = stack.getSig();
        if (sig == bytes4(keccak256(bytes("handlerFunction_1()")))) {
            // Do something
        } else if (sig == bytes4(keccak256(bytes("handlerFunction_2()")))) {
            bytes32 temp = stack.get();
            // Do something
        } else revert("Invalid post process");
        */
    }

    function _updateToken(address token) internal {
        stack.setAddress(token);
        // Ignore token type to fit old handlers
        // stack.setHandlerType(uint256(HandlerType.Token));
    }

    function _updatePostProcess(bytes32[] memory params) internal {
        for (uint256 i = params.length; i > 0; i--) {
            stack.set(params[i - 1]);
        }
        stack.set(msg.sig);
        stack.setHandlerType(HandlerType.Custom);
    }

    function getContractName() public pure virtual returns (string memory);

    function _revertMsg(string memory functionName, string memory reason)
        internal
        view
    {
        revert(
            string(
                abi.encodePacked(
                    _uint2String(_getCubeCounter()),
                    "_",
                    getContractName(),
                    "_",
                    functionName,
                    ": ",
                    reason
                )
            )
        );
    }

    function _revertMsg(string memory functionName) internal view {
        _revertMsg(functionName, "Unspecified");
    }

    function _uint2String(uint256 n) internal pure returns (string memory) {
        if (n == 0) {
            return "0";
        } else {
            uint256 len = 0;
            for (uint256 temp = n; temp > 0; temp /= 10) {
                len++;
            }
            bytes memory str = new bytes(len);
            for (uint256 i = len; i > 0; i--) {
                str[i - 1] = bytes1(uint8(48 + (n % 10)));
                n /= 10;
            }
            return string(str);
        }
    }

    function _getBalance(address token, uint256 amount)
        internal
        view
        returns (uint256)
    {
        if (amount != uint256(-1)) {
            return amount;
        }

        // ETH case
        if (
            token == address(0) ||
            token == address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
        ) {
            return address(this).balance;
        }
        // ERC20 token case
        return IERC20(token).balanceOf(address(this));
    }

    function _tokenApprove(
        address token,
        address spender,
        uint256 amount
    ) internal {
        try IERC20Usdt(token).approve(spender, amount) {} catch {
            IERC20(token).safeApprove(spender, 0);
            IERC20(token).safeApprove(spender, amount);
        }
    }
}

// File: contracts/handlers/weth/IWETH9.sol

pragma solidity ^0.6.0;

interface IWETH9 {
    fallback() external payable;
    function deposit() external payable;
    function withdraw(uint256 wad) external;
}

// File: contracts/handlers/aavev2/ILendingPoolAddressesProviderV2.sol

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 ILendingPoolAddressesProviderV2 {
  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;
}

// File: contracts/handlers/aavev2/libraries/DataTypes.sol

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}
}

// File: contracts/handlers/aavev2/ILendingPoolV2.sol

pragma solidity 0.6.12;



interface ILendingPoolV2 {
  /**
   * @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 (ILendingPoolAddressesProviderV2);

  function setPause(bool val) external;

  function paused() external view returns (bool);
}

// File: contracts/handlers/aavev2/IFlashLoanReceiver.sol

pragma solidity ^0.6.0;


interface IFlashLoanReceiver {
  function executeOperation(
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata premiums,
    address initiator,
    bytes calldata params
  ) external returns (bool);
}

// File: contracts/handlers/aavev2/HAaveProtocolV2.sol

pragma solidity ^0.6.0;










contract HAaveProtocolV2 is HandlerBase, IFlashLoanReceiver {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    // prettier-ignore
    address public constant PROVIDER = 0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5;
    // prettier-ignore
    address payable public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    // prettier-ignore
    address payable public constant ETHER = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    uint16 public constant REFERRAL_CODE = 56;

    function getContractName() public pure override returns (string memory) {
        return "HAaveProtocolV2";
    }

    function deposit(address asset, uint256 amount) external payable {
        amount = _getBalance(asset, amount);
        _deposit(asset, amount);
    }

    function depositETH(uint256 amount) external payable {
        amount = _getBalance(ETHER, amount);
        IWETH9(WETH).deposit{value: amount}();
        _deposit(WETH, amount);

        _updateToken(WETH);
    }

    function withdraw(address asset, uint256 amount)
        external
        payable
        returns (uint256 withdrawAmount)
    {
        withdrawAmount = _withdraw(asset, amount);

        _updateToken(asset);
    }

    function withdrawETH(uint256 amount)
        external
        payable
        returns (uint256 withdrawAmount)
    {
        withdrawAmount = _withdraw(WETH, amount);
        IWETH9(WETH).withdraw(withdrawAmount);
    }

    function repay(
        address asset,
        uint256 amount,
        uint256 rateMode,
        address onBehalfOf
    ) external payable returns (uint256 remainDebt) {
        remainDebt = _repay(asset, amount, rateMode, onBehalfOf);
    }

    function repayETH(
        uint256 amount,
        uint256 rateMode,
        address onBehalfOf
    ) external payable returns (uint256 remainDebt) {
        IWETH9(WETH).deposit{value: amount}();
        remainDebt = _repay(WETH, amount, rateMode, onBehalfOf);

        _updateToken(WETH);
    }

    function borrow(
        address asset,
        uint256 amount,
        uint256 rateMode
    ) external payable {
        address onBehalfOf = _getSender();
        _borrow(asset, amount, rateMode, onBehalfOf);
        _updateToken(asset);
    }

    function borrowETH(uint256 amount, uint256 rateMode) external payable {
        address onBehalfOf = _getSender();
        _borrow(WETH, amount, rateMode, onBehalfOf);
        IWETH9(WETH).withdraw(amount);
    }

    function flashLoan(
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata modes,
        bytes calldata params
    ) external payable {
        if (assets.length != amounts.length) {
            _revertMsg("flashLoan", "assets and amounts do not match");
        }

        if (assets.length != modes.length) {
            _revertMsg("flashLoan", "assets and modes do not match");
        }

        address onBehalfOf = _getSender();
        address pool =
            ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool();

        try
            ILendingPoolV2(pool).flashLoan(
                address(this),
                assets,
                amounts,
                modes,
                onBehalfOf,
                params,
                REFERRAL_CODE
            )
        {} catch Error(string memory reason) {
            _revertMsg("flashLoan", reason);
        } catch {
            _revertMsg("flashLoan");
        }

        // approve lending pool zero
        for (uint256 i = 0; i < assets.length; i++) {
            IERC20(assets[i]).safeApprove(pool, 0);
            if (modes[i] != 0) _updateToken(assets[i]);
        }
    }

    function executeOperation(
        address[] memory assets,
        uint256[] memory amounts,
        uint256[] memory premiums,
        address initiator,
        bytes memory params
    ) external override returns (bool) {
        if (
            msg.sender !=
            ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool()
        ) {
            _revertMsg("executeOperation", "invalid caller");
        }

        if (initiator != address(this)) {
            _revertMsg("executeOperation", "not initiated by the proxy");
        }

        (address[] memory tos, bytes32[] memory configs, bytes[] memory datas) =
            abi.decode(params, (address[], bytes32[], bytes[]));
        IProxy(address(this)).execs(tos, configs, datas);

        address pool =
            ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool();
        for (uint256 i = 0; i < assets.length; i++) {
            uint256 amountOwing = amounts[i].add(premiums[i]);
            IERC20(assets[i]).safeApprove(pool, amountOwing);
        }
        return true;
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function _deposit(address asset, uint256 amount) internal {
        (address pool, address aToken) = _getLendingPoolAndAToken(asset);
        IERC20(asset).safeApprove(pool, amount);

        try
            ILendingPoolV2(pool).deposit(
                asset,
                amount,
                address(this),
                REFERRAL_CODE
            )
        {} catch Error(string memory reason) {
            _revertMsg("deposit", reason);
        } catch {
            _revertMsg("deposit");
        }

        IERC20(asset).safeApprove(pool, 0);
        _updateToken(aToken);
    }

    function _withdraw(address asset, uint256 amount)
        internal
        returns (uint256 withdrawAmount)
    {
        (address pool, address aToken) = _getLendingPoolAndAToken(asset);
        amount = _getBalance(aToken, amount);

        try
            ILendingPoolV2(pool).withdraw(asset, amount, address(this))
        returns (uint256 ret) {
            withdrawAmount = ret;
        } catch Error(string memory reason) {
            _revertMsg("withdraw", reason);
        } catch {
            _revertMsg("withdraw");
        }
    }

    function _repay(
        address asset,
        uint256 amount,
        uint256 rateMode,
        address onBehalfOf
    ) internal returns (uint256 remainDebt) {
        address pool =
            ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool();
        IERC20(asset).safeApprove(pool, amount);

        try
            ILendingPoolV2(pool).repay(asset, amount, rateMode, onBehalfOf)
        {} catch Error(string memory reason) {
            _revertMsg("repay", reason);
        } catch {
            _revertMsg("repay");
        }

        IERC20(asset).safeApprove(pool, 0);

        DataTypes.ReserveData memory reserve =
            ILendingPoolV2(pool).getReserveData(asset);
        remainDebt = DataTypes.InterestRateMode(rateMode) ==
            DataTypes.InterestRateMode.STABLE
            ? IERC20(reserve.stableDebtTokenAddress).balanceOf(onBehalfOf)
            : IERC20(reserve.variableDebtTokenAddress).balanceOf(onBehalfOf);
    }

    function _borrow(
        address asset,
        uint256 amount,
        uint256 rateMode,
        address onBehalfOf
    ) internal {
        address pool =
            ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool();

        try
            ILendingPoolV2(pool).borrow(
                asset,
                amount,
                rateMode,
                REFERRAL_CODE,
                onBehalfOf
            )
        {} catch Error(string memory reason) {
            _revertMsg("borrow", reason);
        } catch {
            _revertMsg("borrow");
        }
    }

    function _getLendingPoolAndAToken(address underlying)
        internal
        view
        returns (address pool, address aToken)
    {
        pool = ILendingPoolAddressesProviderV2(PROVIDER).getLendingPool();
        try ILendingPoolV2(pool).getReserveData(underlying) returns (
            DataTypes.ReserveData memory data
        ) {
            aToken = data.aTokenAddress;
            if (aToken == address(0))
                _revertMsg("General", "aToken should not be zero address");
        } catch Error(string memory reason) {
            _revertMsg("General", reason);
        } catch {
            _revertMsg("General");
        }
    }
}

{
  "compilationTarget": {
    "HAaveProtocolV2.sol": "HAaveProtocolV2"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}