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// SPDX-License-Identifier: MIT
pragma solidity >=0.4.25 <0.7.5;

import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
import { UniERC20 } from "../Libraries/LibUniERC20.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IProvider } from "./IProvider.sol";

interface IGenCyToken is IERC20 {
  function redeem(uint256) external returns (uint256);

  function redeemUnderlying(uint256) external returns (uint256);

  function borrow(uint256 borrowAmount) external returns (uint256);

  function exchangeRateCurrent() external returns (uint256);

  function exchangeRateStored() external view returns (uint256);

  function borrowRatePerBlock() external view returns (uint256);

  function balanceOfUnderlying(address owner) external returns (uint256);

  function getAccountSnapshot(address account)
    external
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    );

  function totalBorrowsCurrent() external returns (uint256);

  function borrowBalanceCurrent(address account) external returns (uint256);

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

  function getCash() external view returns (uint256);
}

interface IWeth is IERC20 {
  function deposit() external payable;

  function withdraw(uint256 wad) external;
}

interface ICyErc20 is IGenCyToken {
  function mint(uint256) external returns (uint256);

  function repayBorrow(uint256 repayAmount) external returns (uint256);

  function repayBorrowBehalf(address borrower, uint256 repayAmount) external returns (uint256);
}

interface IComptroller {
  function markets(address) external returns (bool, uint256);

  function enterMarkets(address[] calldata) external returns (uint256[] memory);

  function exitMarket(address cyTokenAddress) external returns (uint256);

  function getAccountLiquidity(address)
    external
    view
    returns (
      uint256,
      uint256,
      uint256
    );
}

interface IFujiMappings {
  function addressMapping(address) external view returns (address);
}

contract HelperFunct {
  function _isETH(address token) internal pure returns (bool) {
    return (token == address(0) || token == address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE));
  }

  function _getMappingAddr() internal pure returns (address) {
    return 0x17525aFdb24D24ABfF18108E7319b93012f3AD24;
  }

  function _getComptrollerAddress() internal pure returns (address) {
    return 0xAB1c342C7bf5Ec5F02ADEA1c2270670bCa144CbB;
  }

  //IronBank functions

  /**
   * @dev Approves vault's assets as collateral for IronBank Protocol.
   * @param _cyTokenAddress: asset type to be approved as collateral.
   */
  function _enterCollatMarket(address _cyTokenAddress) internal {
    // Create a reference to the corresponding network Comptroller
    IComptroller comptroller = IComptroller(_getComptrollerAddress());

    address[] memory cyTokenMarkets = new address[](1);
    cyTokenMarkets[0] = _cyTokenAddress;
    comptroller.enterMarkets(cyTokenMarkets);
  }

  /**
   * @dev Removes vault's assets as collateral for IronBank Protocol.
   * @param _cyTokenAddress: asset type to be removed as collateral.
   */
  function _exitCollatMarket(address _cyTokenAddress) internal {
    // Create a reference to the corresponding network Comptroller
    IComptroller comptroller = IComptroller(_getComptrollerAddress());

    comptroller.exitMarket(_cyTokenAddress);
  }
}

contract ProviderIronBank is IProvider, HelperFunct {
  using SafeMath for uint256;
  using UniERC20 for IERC20;

  //Provider Core Functions

  /**
   * @dev Deposit ETH/ERC20_Token.
   * @param _asset: token address to deposit. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
   * @param _amount: token amount to deposit.
   */
  function deposit(address _asset, uint256 _amount) external payable override {
    //Get cyToken address from mapping
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    //Enter and/or ensure collateral market is enacted
    _enterCollatMarket(cyTokenAddr);

    if (_isETH(_asset)) {
      // Transform ETH to WETH
      IWeth(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2).deposit{ value: _amount }();
      _asset = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
    }

    // Create reference to the ERC20 contract
    IERC20 erc20token = IERC20(_asset);

    // Create a reference to the cyToken contract
    ICyErc20 cyToken = ICyErc20(cyTokenAddr);

    //Checks, Vault balance of ERC20 to make deposit
    require(erc20token.balanceOf(address(this)) >= _amount, "Not enough Balance");

    //Approve to move ERC20tokens
    erc20token.uniApprove(address(cyTokenAddr), _amount);

    // IronBank Protocol mints cyTokens, trhow error if not
    require(cyToken.mint(_amount) == 0, "Deposit-failed");
  }

  /**
   * @dev Withdraw ETH/ERC20_Token.
   * @param _asset: token address to withdraw. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
   * @param _amount: token amount to withdraw.
   */
  function withdraw(address _asset, uint256 _amount) external payable override {
    //Get cyToken address from mapping
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    // Create a reference to the corresponding cyToken contract
    IGenCyToken cyToken = IGenCyToken(cyTokenAddr);

    //IronBank Protocol Redeem Process, throw errow if not.
    require(cyToken.redeemUnderlying(_amount) == 0, "Withdraw-failed");

    if (_isETH(_asset)) {
      // Transform ETH to WETH
      IWeth(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2).withdraw(_amount);
    }
  }

  /**
   * @dev Borrow ETH/ERC20_Token.
   * @param _asset token address to borrow.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
   * @param _amount: token amount to borrow.
   */
  function borrow(address _asset, uint256 _amount) external payable override {
    //Get cyToken address from mapping
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    // Create a reference to the corresponding cyToken contract
    IGenCyToken cyToken = IGenCyToken(cyTokenAddr);

    //Enter and/or ensure collateral market is enacted
    //_enterCollatMarket(cyTokenAddr);

    //IronBank Protocol Borrow Process, throw errow if not.
    require(cyToken.borrow(_amount) == 0, "borrow-failed");
  }

  /**
   * @dev Payback borrowed ETH/ERC20_Token.
   * @param _asset token address to payback.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
   * @param _amount: token amount to payback.
   */
  function payback(address _asset, uint256 _amount) external payable override {
    //Get cyToken address from mapping
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    if (_isETH(_asset)) {
      // Transform ETH to WETH
      IWeth(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2).deposit{ value: _amount }();
      _asset = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
    }

    // Create reference to the ERC20 contract
    IERC20 erc20token = IERC20(_asset);

    // Create a reference to the corresponding cyToken contract
    ICyErc20 cyToken = ICyErc20(cyTokenAddr);

    // Check there is enough balance to pay
    require(erc20token.balanceOf(address(this)) >= _amount, "Not-enough-token");
    erc20token.uniApprove(address(cyTokenAddr), _amount);
    cyToken.repayBorrow(_amount);
  }

  /**
   * @dev Returns the current borrowing rate (APR) of a ETH/ERC20_Token, in ray(1e27).
   * @param _asset: token address to query the current borrowing rate.
   */
  function getBorrowRateFor(address _asset) external view override returns (uint256) {
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    //Block Rate transformed for common mantissa for Fuji in ray (1e27), Note: IronBank uses base 1e18
    uint256 bRateperBlock = (IGenCyToken(cyTokenAddr).borrowRatePerBlock()).mul(10**9);

    // The approximate number of blocks per year that is assumed by the IronBank interest rate model
    uint256 blocksperYear = 2102400;
    return bRateperBlock.mul(blocksperYear);
  }

  /**
   * @dev Returns the borrow balance of a ETH/ERC20_Token.
   * @param _asset: token address to query the balance.
   */
  function getBorrowBalance(address _asset) external view override returns (uint256) {
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    return IGenCyToken(cyTokenAddr).borrowBalanceStored(msg.sender);
  }

  /**
   * @dev Return borrow balance of ETH/ERC20_Token.
   * This function is the accurate way to get IronBank borrow balance.
   * It costs ~84K gas and is not a view function.
   * @param _asset token address to query the balance.
   * @param _who address of the account.
   */
  function getBorrowBalanceOf(address _asset, address _who) external override returns (uint256) {
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    return IGenCyToken(cyTokenAddr).borrowBalanceCurrent(_who);
  }

  /**
   * @dev Returns the deposit balance of a ETH/ERC20_Token.
   * @param _asset: token address to query the balance.
   */
  function getDepositBalance(address _asset) external view override returns (uint256) {
    address cyTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);
    uint256 cyTokenBal = IGenCyToken(cyTokenAddr).balanceOf(msg.sender);
    uint256 exRate = IGenCyToken(cyTokenAddr).exchangeRateStored();

    return exRate.mul(cyTokenBal).div(1e18);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

library UniERC20 {
  using SafeERC20 for IERC20;

  IERC20 private constant _ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
  IERC20 private constant _ZERO_ADDRESS = IERC20(0);

  function isETH(IERC20 token) internal pure returns (bool) {
    return (token == _ZERO_ADDRESS || token == _ETH_ADDRESS);
  }

  function uniBalanceOf(IERC20 token, address account) internal view returns (uint256) {
    if (isETH(token)) {
      return account.balance;
    } else {
      return token.balanceOf(account);
    }
  }

  function uniTransfer(
    IERC20 token,
    address payable to,
    uint256 amount
  ) internal {
    if (amount > 0) {
      if (isETH(token)) {
        to.transfer(amount);
      } else {
        token.safeTransfer(to, amount);
      }
    }
  }

  function uniApprove(
    IERC20 token,
    address to,
    uint256 amount
  ) internal {
    require(!isETH(token), "Approve called on ETH");

    if (amount == 0) {
      token.safeApprove(to, 0);
    } else {
      uint256 allowance = token.allowance(address(this), to);
      if (allowance < amount) {
        if (allowance > 0) {
          token.safeApprove(to, 0);
        }
        token.safeApprove(to, amount);
      }
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.4.25 <0.7.0;

interface IProvider {
  //Basic Core Functions

  function deposit(address _collateralAsset, uint256 _collateralAmount) external payable;

  function borrow(address _borrowAsset, uint256 _borrowAmount) external payable;

  function withdraw(address _collateralAsset, uint256 _collateralAmount) external payable;

  function payback(address _borrowAsset, uint256 _borrowAmount) external payable;

  // returns the borrow annualized rate for an asset in ray (1e27)
  //Example 8.5% annual interest = 0.085 x 10^27 = 85000000000000000000000000 or 85*(10**24)
  function getBorrowRateFor(address _asset) external view returns (uint256);

  function getBorrowBalance(address _asset) external view returns (uint256);

  function getDepositBalance(address _asset) external view returns (uint256);

  function getBorrowBalanceOf(address _asset, address _who) external returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

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

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

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"borrow","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getBorrowBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"address","name":"_who","type":"address"}],"name":"getBorrowBalanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getBorrowRateFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getDepositBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"payback","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"}]

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