Contract 0xf5eB1736C98493cAaa25A8D83494CFeF558a9D3F

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../../interfaces/IProvider.sol";
import "../../interfaces/IUnwrapper.sol";
import "../../interfaces/IVault.sol";
import "../../interfaces/IWETH.sol";
import "../../interfaces/IFujiMappings.sol";
import "../../interfaces/compound/IGenCToken.sol";
import "../../interfaces/compound/ICEth.sol";
import "../../interfaces/compound/ICErc20.sol";
import "../../interfaces/compound/IComptroller.sol";
import "../../interfaces/compound/IProxyReceiver.sol";
import "../libraries/LibUniversalERC20FTM.sol";

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

  function _getMappingAddr() internal pure returns (address) {
    return 0xE89f9aFe2cd8B0498FC575238b0ef65Cf24e3De2; // Hundred fantom mapper
  }

  function _getComptrollerAddress() internal pure returns (address) {
    return 0x0F390559F258eB8591C8e31Cf0905E97cf36ACE2; // Hundred fantom
  }

  function _getUnwrapper() internal pure returns (address) {
    return 0xee94A39D185329d8c46dEA726E01F91641E57346;
  }

  function _getProxyReceiver() internal pure returns (address) {
    return 0x0A666645b6429eB1A5e04a4831092F7b907C2606;
  }

  // Fantom Hundred functions

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

    address[] memory cTokenMarkets = new address[](1);
    cTokenMarkets[0] = _cTokenAddress;
    comptroller.enterMarkets(cTokenMarkets);
  }

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

    comptroller.exitMarket(_cTokenAddress);
  }
}

contract ProviderHundred is IProvider, HelperFunct {
  using LibUniversalERC20FTM for IERC20;

  // Provider Core Functions

  /**
   * @dev Deposit '_asset'.
   * @param _asset: token address to deposit. (For FTM: 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF)
   * @param _amount: token amount to deposit.
   */
  function deposit(address _asset, uint256 _amount) external payable override {
    // Get cToken address from mapping
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

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

    if (_isFTM(_asset)) {
      // Create a reference to the cToken contract
      ICEth cToken = ICEth(cTokenAddr);

      // Compound protocol Mints cTokens, ETH method
      cToken.mint{ value: _amount }();
    } else {
      // Create reference to the ERC20 contract
      IERC20 erc20token = IERC20(_asset);

      // Create a reference to the cToken contract
      ICErc20 cToken = ICErc20(cTokenAddr);

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

      // Approve to move ERC20tokens
      erc20token.univApprove(address(cTokenAddr), _amount);

      // Compound Protocol mints cTokens, trhow error if not
      require(cToken.mint(_amount) == 0, "Deposit-failed");
    }
  }

  /**
   * @dev Withdraw '_asset'.
   * @param _asset: token address to withdraw. (For FTM: 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF)
   * @param _amount: token amount to withdraw.
   */
  function withdraw(address _asset, uint256 _amount) external payable override {
    // Get cToken address from mapping
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    // Create a reference to the corresponding cToken contract
    IGenCToken cToken = IGenCToken(cTokenAddr);

    if (_isFTM(_asset)) {
      // use a proxy receiver because Hundred uses "to.transfer(amount)"
      // which runs out of gas whit proxy contracts
      uint256 exRate = cToken.exchangeRateStored();
      uint256 scaledAmount = _amount * 1e18 / exRate;

      address receiverAddr = _getProxyReceiver();
      cToken.transfer(receiverAddr, scaledAmount);
      IProxyReceiver(receiverAddr).withdraw(_amount, cToken);
    } else {
      require(cToken.redeemUnderlying(_amount) == 0, "Withdraw-failed");
    }
  }

  /**
   * @dev Borrow '_asset'.
   * @param _asset token address to borrow.(For FTM: 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF)
   * @param _amount: token amount to borrow.
   */
  function borrow(address _asset, uint256 _amount) external payable override {
    // Get cToken address from mapping
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    // Create a reference to the corresponding cToken contract
    IGenCToken cToken = IGenCToken(cTokenAddr);

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

  /**
   * @dev Payback borrowed '_asset'.
   * @param _asset token address to payback.(For FTM: 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF)
   * @param _amount: token amount to payback.
   */
  function payback(address _asset, uint256 _amount) external payable override {
    // Get cToken address from mapping
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    if (_isFTM(_asset)) {
      // Create a reference to the corresponding cToken contract
      ICEth cToken = ICEth(cTokenAddr);

      cToken.repayBorrow{ value: msg.value }();
    } else {
      // Create reference to the ERC20 contract
      IERC20 erc20token = IERC20(_asset);

      // Create a reference to the corresponding cToken contract
      ICErc20 cToken = ICErc20(cTokenAddr);

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

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

    // Block Rate transformed for common mantissa for Fuji in ray (1e27)
    // Note: Cream uses base 1e18
    uint256 bRateperBlock = IGenCToken(cTokenAddr).borrowRatePerBlock() * 10**9;

    // The approximate number of blocks per year that is assumed by the Cream interest rate model
    // ~60 blocks per min in fantom
    return bRateperBlock * 60 * 60 * 24 * 365;
  }

  /**
   * @dev Returns the borrow balance of '_asset' of caller.
   * NOTE: Returned value is at the last update state of provider.
   * @param _asset: token address to query the balance.
   */
  function getBorrowBalance(address _asset) external view override returns (uint256) {
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    return IGenCToken(cTokenAddr).borrowBalanceStored(msg.sender);
  }

  /**
   * @dev Return borrow balance of '_asset' of caller.
   * This function updates the state of provider contract to return latest 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 cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);

    return IGenCToken(cTokenAddr).borrowBalanceCurrent(_who);
  }

  /**
   * @dev Returns the deposit balance of '_asset' of caller.
   * @param _asset: token address to query the balance.
   */
  function getDepositBalance(address _asset) external view override returns (uint256) {
    address cTokenAddr = IFujiMappings(_getMappingAddr()).addressMapping(_asset);
    uint256 cTokenBal = IGenCToken(cTokenAddr).balanceOf(msg.sender);
    uint256 exRate = IGenCToken(cTokenAddr).exchangeRateStored();

    return (exRate * cTokenBal) / 1e18;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 ^0.8.0;

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 ^0.8.0;

interface IUnwrapper {
  function withdraw(uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IVault {
  // Vault Events

  /**
   * @dev Log a deposit transaction done by a user
   */
  event Deposit(address indexed userAddrs, address indexed asset, uint256 amount);
  /**
   * @dev Log a withdraw transaction done by a user
   */
  event Withdraw(address indexed userAddrs, address indexed asset, uint256 amount);
  /**
   * @dev Log a borrow transaction done by a user
   */
  event Borrow(address indexed userAddrs, address indexed asset, uint256 amount);
  /**
   * @dev Log a payback transaction done by a user
   */
  event Payback(address indexed userAddrs, address indexed asset, uint256 amount);
  /**
   * @dev Log a switch from provider to new provider in vault
   */
  event Switch(
    address fromProviderAddrs,
    address toProviderAddr,
    uint256 debtamount,
    uint256 collattamount
  );
  /**
   * @dev Log a change in active provider
   */
  event SetActiveProvider(address newActiveProviderAddress);
  /**
   * @dev Log a change in the array of provider addresses
   */
  event ProvidersChanged(address[] newProviderArray);
  /**
   * @dev Log a change in F1155 address
   */
  event F1155Changed(address newF1155Address);
  /**
   * @dev Log a change in fuji admin address
   */
  event FujiAdminChanged(address newFujiAdmin);
  /**
   * @dev Log a change in the factor values
   */
  event FactorChanged(FactorType factorType, uint64 newFactorA, uint64 newFactorB);
  /**
   * @dev Log a change in the oracle address
   */
  event OracleChanged(address newOracle);

  enum FactorType {
    Safety,
    Collateralization,
    ProtocolFee,
    BonusLiquidation
  }

  struct Factor {
    uint64 a;
    uint64 b;
  }

  // Core Vault Functions

  function deposit(uint256 _collateralAmount) external payable;

  function withdraw(int256 _withdrawAmount) external;

  function withdrawLiq(int256 _withdrawAmount) external;

  function borrow(uint256 _borrowAmount) external;

  function payback(int256 _repayAmount) external payable;

  function paybackLiq(address[] memory _users, uint256 _repayAmount) external payable;

  function executeSwitch(
    address _newProvider,
    uint256 _flashLoanDebt,
    uint256 _fee
  ) external payable;

  //Getter Functions

  function activeProvider() external view returns (address);

  function borrowBalance(address _provider) external view returns (uint256);

  function depositBalance(address _provider) external view returns (uint256);

  function userDebtBalance(address _user) external view returns (uint256);

  function userProtocolFee(address _user) external view returns (uint256);

  function userDepositBalance(address _user) external view returns (uint256);

  function getNeededCollateralFor(uint256 _amount, bool _withFactors)
    external
    view
    returns (uint256);

  function getLiquidationBonusFor(uint256 _amount) external view returns (uint256);

  function getProviders() external view returns (address[] memory);

  function fujiERC1155() external view returns (address);

  //Setter Functions

  function setActiveProvider(address _provider) external;

  function updateF1155Balances() external;

  function protocolFee() external view returns (uint64, uint64);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IWETH {
  function approve(address, uint256) external;

  function deposit() external payable;

  function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IFujiMappings {
  // FujiMapping Events

  /**
   * @dev Log a change in address mapping
   */
  event MappingChanged(address keyAddress, address mappedAddress);
  /**
   * @dev Log a change in URI
   */
  event UriChanged(string newUri);

  function addressMapping(address) external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IGenCToken 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 supplyRatePerBlock() external view returns (uint256);

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./IGenCToken.sol";

interface ICEth is IGenCToken {
  function mint() external payable;

  function repayBorrow() external payable;

  function repayBorrowBehalf(address borrower) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./IGenCToken.sol";

interface ICErc20 is IGenCToken {
  function mint(uint256) external returns (uint256);

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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 claimComp(address holder) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IGenCToken.sol";

interface IProxyReceiver {
  function withdraw(uint256, IGenCToken) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

library LibUniversalERC20FTM {
  using SafeERC20 for IERC20;

  IERC20 private constant _FTM_ADDRESS = IERC20(0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF);
  IERC20 private constant _ZERO_ADDRESS = IERC20(0x0000000000000000000000000000000000000000);

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

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

  function univTransfer(
    IERC20 token,
    address payable to,
    uint256 amount
  ) internal {
    if (amount > 0) {
      if (isFTM(token)) {
        (bool sent, ) = to.call{ value: amount }("");
        require(sent, "Failed to send Ether");
      } else {
        token.safeTransfer(to, amount);
      }
    }
  }

  function univApprove(
    IERC20 token,
    address to,
    uint256 amount
  ) internal {
    require(!isFTM(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 ^0.8.0;

import "../IERC20.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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;
        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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                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",
        "devdoc",
        "userdoc",
        "metadata",
        "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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