Contract Source Code (Solidity)

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Outline

• interface LendingInterface
•    - function depositEth()
•    - function depositErc20(address tokenAd ...
•    - function borrow(address tokenAddress, ...
•    - function withdraw(address tokenAddres ...
•    - function repayEth()
•    - function repayErc20(address tokenAddr ...
•    - function forceLiquidate(address token ...
•    - function getStakingAddress()
•    - function getTaxTokenAddress()
•    - function getInterest()
•    - function getTvl(address tokenAddress)
•    - function getTotalLending(address toke ...
•    - function getTotalBorrowing(address to ...
•    - function getTokenInfo(address tokenAd ...
•    - function getLenderAccount(address tok ...
•    - function getBorrowerAccount(address t ...
•    - function getRemainingCredit(address t ...
•    - function getAccountInfo(address token ...
•    - function _msgSender()
•    - function _msgData()
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b, st ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function _functionCallWithValue(addre ...
•  contract ERC20 is Context, IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address sender, ad ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _setupDecimals(uint8 decimal ...
•    - function _beforeTokenTransfer(address ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function _callOptionalReturn(IERC20 t ...
• interface TaxTokenInterface is IERC20
•    - function mintToken(
•    - function registerWhitelist(address, a ...
•    - function unregisterWhitelist(address)
•    - function updateLendingAddress(address ...
•    - function updateIncentiveAddresses(add ...
•    - function updateGovernanceAddress(addr ...
•    - function mintDeveloperFund()
•    - function mintIncentiveFund()
•    - function getGovernanceAddress()
•    - function getDeveloperAddress()
•    - function getLendingAddress()
•    - function getFunds()
•    - function getConfigs()
•    - function getIncentiveFundAddresses()
•    - function getMintUnit()
•    - function getOracleAddress(address)
•    - function name()
•    - function symbol()
•    - function decimals()
•  contract TransferETH
•    - function _transferETH(
•    - function _transferETH(address payable ...
•  contract Lending is LendingInterfa ... *
•    - function depositEth()
•    - function depositErc20(address tokenAd ...
•    - function borrow(address tokenAddress, ...
•    - function withdraw(address tokenAddres ...
•    - function repayEth()
•    - function repayErc20(address tokenAddr ...
•    - function forceLiquidate(address token ...
•    - function _deposit(
•    - function _borrow(
•    - function _withdraw(
•    - function _repay(
•    - function getStakingAddress()
•    - function getTaxTokenAddress()
•    - function getInterest()
•    - function getTvl(address tokenAddress)
•    - function getTotalLending(address toke ...
•    - function getTotalBorrowing(address to ...
•    - function getTokenInfo(address tokenAd ...
•    - function getLenderAccount(address tok ...
•    - function getBorrowerAccount(address t ...
•    - function getRemainingCredit(address t ...
•    - function getAccountInfo(address token ...

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/**
 *Submitted for verification at Etherscan.io on 2020-12-07
*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.7.1;

// File: contracts/lending/LendingInterface.sol

interface LendingInterface {
    function depositEth() external payable;

    function depositErc20(address tokenAddress, uint256 amount) external;

    function borrow(address tokenAddress, uint256 amount) external;

    function withdraw(address tokenAddress, uint256 amount) external;

    function repayEth() external payable;

    function repayErc20(address tokenAddress, uint256 amount) external;

    function forceLiquidate(address token, address account) external;

    function getStakingAddress() external view returns (address);

    function getTaxTokenAddress() external view returns (address);

    function getInterest() external view returns (uint256);

    function getTvl(address tokenAddress) external view returns (uint256);

    function getTotalLending(address tokenAddress) external view returns (uint256);

    function getTotalBorrowing(address tokenAddress) external view returns (uint256);

    function getTokenInfo(address tokenAddress)
        external
        view
        returns (uint256 totalLendAmount, uint256 totalBorrowAmount);

    function getLenderAccount(address tokenAddress, address userAddress)
        external
        view
        returns (uint256);

    function getBorrowerAccount(address tokenAddress, address userAddress)
        external
        view
        returns (uint256);

    function getRemainingCredit(address tokenAddress, address userAddress)
        external
        view
        returns (uint256);

    function getAccountInfo(address tokenAddress, address userAddress)
        external
        view
        returns (
            uint256 lendAccount,
            uint256 borrowAccount,
            uint256 remainingCredit
        );
}

// File: @openzeppelin/contracts/GSN/Context.sol

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

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

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

/**
 * @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

/**
 * @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

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

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

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

    /**
     * @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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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/ERC20.sol





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

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(sender, recipient, amount);

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.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");
        }
    }
}

// File: contracts/token/TaxTokenInterface.sol


interface TaxTokenInterface is IERC20 {
    function mintToken(
        address,
        uint256,
        address
    ) external;

    function registerWhitelist(address, address) external;

    function unregisterWhitelist(address) external;

    function updateLendingAddress(address) external;

    function updateIncentiveAddresses(address[] memory, uint256[] memory) external;

    function updateGovernanceAddress(address) external;

    function mintDeveloperFund() external;

    function mintIncentiveFund() external;

    function getGovernanceAddress() external view returns (address);

    function getDeveloperAddress() external view returns (address);

    function getLendingAddress() external view returns (address);

    function getFunds() external view returns (uint256 developerFund, uint256 incentiveFund);

    function getConfigs()
        external
        view
        returns (
            uint256 maxTotalSupply,
            uint256 halvingStartLendValue,
            uint256 halvingDecayRateE8,
            uint256 developerFundRateE8,
            uint256 incentiveFundRateE8
        );

    function getIncentiveFundAddresses()
        external
        view
        returns (
            address[] memory incentiveFundAddresses,
            uint256[] memory incentiveFundAllocationE8
        );

    function getMintUnit() external view returns (uint256);

    function getOracleAddress(address) external view returns (address);

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

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

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

// File: contracts/util/TransferETH.sol

contract TransferETH {
    receive() external payable {}

    /**
     * @notice transfer `amount` ETH to the `recipient` account with emitting log
     */
    function _transferETH(
        address payable recipient,
        uint256 amount,
        string memory errorMessage
    ) internal {
        (bool success, ) = recipient.call{value: amount}("");
        require(success, errorMessage);
    }

    function _transferETH(address payable recipient, uint256 amount) internal {
        _transferETH(recipient, amount, "Transfer amount exceeds balance");
    }
}

// File: contracts/lending/Lending.sol







contract Lending is LendingInterface, TransferETH {
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    /* ========== CONSTANT VARIABLES ========== */

    address internal constant ETH_ADDRESS = address(0);
    uint256 internal constant COLLATERAL_RATIO = 100; // minimum collateral ratio is 100%.
    TaxTokenInterface internal immutable _taxTokenContract;
    address internal immutable _stakingAddress;
    uint256 internal immutable _interestE3; // 0.0% - 100.0%

    /* ========== STATE VARIABLES ========== */

    mapping(bytes32 => uint256) internal _lenderAccount; // keccak(tokenAddress, userAddress) => amount
    mapping(bytes32 => uint256) internal _borrowerAccount; // keccak(tokenAddress, userAddress) => amount
    mapping(bytes32 => uint256) internal _remainingCredit; // keccak(tokenAddress, userAddress) => amount
    mapping(address => uint256) internal _totalLending; // tokenAddress => amount
    mapping(address => uint256) internal _totalBorrowing; // tokenAddress => amount

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address taxTokenAddress,
        address stakingAddress,
        uint256 interestE3
    ) {
        _taxTokenContract = TaxTokenInterface(taxTokenAddress);
        _stakingAddress = stakingAddress;
        _interestE3 = interestE3;
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    /**
     * @notice Deposit(lend) collateral in ETH.
     * As users can potentially be borrowers as well, the function charges the upfront interest fee.
     * Users can rececive the upfront interest fee in tax token.
     */
    function depositEth() external payable override {
        uint256 feeRate = _deposit(msg.sender, ETH_ADDRESS, msg.value);
        _transferETH(payable(_stakingAddress), feeRate);
    }

    /**
     * @notice Deposit(lend) collateral in any erc20 token.
     * As users can potentially be borrowers as well, the function charges the upfront interest fee.
     * Iff the erc20 token is whitelisted in the tax token, users can rececive the upfront interest fee in tax token.
     */
    function depositErc20(address tokenAddress, uint256 amount) external override {
        ERC20(tokenAddress).safeTransferFrom(msg.sender, address(this), amount);
        uint256 feeRate = _deposit(msg.sender, tokenAddress, amount);
        ERC20(tokenAddress).safeTransfer(_stakingAddress, feeRate);
    }

    /**
     * @notice Borrow up to the amount of remaining credit.
     */
    function borrow(address tokenAddress, uint256 amount) external override {
        _borrow(msg.sender, tokenAddress, amount);
        if (tokenAddress == ETH_ADDRESS) {
            _transferETH(msg.sender, amount);
        } else {
            ERC20(tokenAddress).safeTransfer(msg.sender, amount);
        }
    }

    /**
     * @notice Withdraw the deposited (lended) collateral up to the amount of remaining credit.
     */
    function withdraw(address tokenAddress, uint256 amount) external override {
        _withdraw(msg.sender, tokenAddress, amount);
        if (tokenAddress == ETH_ADDRESS) {
            _transferETH(msg.sender, amount);
        } else {
            ERC20(tokenAddress).safeTransfer(msg.sender, amount);
        }
    }

    function repayEth() external payable override {
        _repay(msg.sender, ETH_ADDRESS, msg.value);
    }

    /**
     * @notice Repay the borrowing erc20 token up to the amount of borrowing.
     */
    function repayErc20(address tokenAddress, uint256 amount) external override {
        ERC20(tokenAddress).safeTransferFrom(msg.sender, address(this), amount);
        _repay(msg.sender, tokenAddress, amount);
    }

    /**
     * @notice Force liquidate if the user doesn't have enough collateral.
     */
    function forceLiquidate(address token, address userAddress) external override {
        bytes32 account = keccak256(abi.encode(token, userAddress));
        require(
            _borrowerAccount[account] > _lenderAccount[account].mul(COLLATERAL_RATIO.div(100)),
            "enough collateral"
        );
        _totalLending[token] -= _lenderAccount[account];
        _totalBorrowing[token] -= _borrowerAccount[account];
        _borrowerAccount[account] = 0;
        _lenderAccount[account] = 0;
        _remainingCredit[account] = 0;
    }

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

    function _deposit(
        address lender,
        address tokenAddress,
        uint256 amount
    ) internal returns (uint256 feeRate) {
        require(amount != 0, "cannot deposit zero amount");
        feeRate = amount.mul(_interestE3).div(1000);
        _totalLending[tokenAddress] = _totalLending[tokenAddress].add(amount).sub(feeRate);
        bytes32 account = keccak256(abi.encode(tokenAddress, lender));
        _lenderAccount[account] = _lenderAccount[account].add(amount).sub(feeRate);
        _remainingCredit[account] = _remainingCredit[account].add(amount).sub(feeRate);
        _taxTokenContract.mintToken(tokenAddress, amount, lender);
    }

    function _borrow(
        address lender,
        address tokenAddress,
        uint256 amount
    ) internal {
        bytes32 account = keccak256(abi.encode(tokenAddress, lender));
        require(amount != 0, "should borrow positive amount");
        require(amount <= _remainingCredit[account], "too much borrow");
        _totalBorrowing[tokenAddress] = _totalBorrowing[tokenAddress].add(amount);
        _remainingCredit[account] = _remainingCredit[account].sub(amount);
        _borrowerAccount[account] = _borrowerAccount[account].add(amount);
    }

    function _withdraw(
        address lender,
        address tokenAddress,
        uint256 amount
    ) internal {
        bytes32 account = keccak256(abi.encode(tokenAddress, lender));
        require(amount != 0, "should withdraw positive amount");
        require(amount <= _remainingCredit[account], "too much withdraw");
        _totalLending[tokenAddress] = _totalLending[tokenAddress].sub(amount);
        _remainingCredit[account] = _remainingCredit[account].sub(amount);
        _lenderAccount[account] = _lenderAccount[account].sub(amount);
    }

    function _repay(
        address lender,
        address tokenAddress,
        uint256 amount
    ) internal {
        bytes32 account = keccak256(abi.encode(tokenAddress, lender));
        require(amount != 0, "should repay positive amount");
        require(amount <= _borrowerAccount[account], "too much repay");
        _totalBorrowing[tokenAddress] = _totalBorrowing[tokenAddress].sub(amount);
        _remainingCredit[account] = _remainingCredit[account].add(amount);
        _borrowerAccount[account] = _borrowerAccount[account].sub(amount);
    }

    /* ========== CALL FUNCTIONS ========== */

    /**
     * @return staking contract address
     */
    function getStakingAddress() external view override returns (address) {
        return _stakingAddress;
    }

    /**
     * @return tax token address
     */
    function getTaxTokenAddress() external view override returns (address) {
        return address(_taxTokenContract);
    }

    /**
     * @return interest fee charged when deposit
     */
    function getInterest() external view override returns (uint256) {
        return _interestE3;
    }

    /**
     * @return total value locked of the token
     */
    function getTvl(address tokenAddress) external view override returns (uint256) {
        return _totalLending[tokenAddress];
    }

    /**
     * @return total lending amount of the token
     */
    function getTotalLending(address tokenAddress) external view override returns (uint256) {
        return _totalLending[tokenAddress];
    }

    /**
     * @return total borrowing amount of the token
     */
    function getTotalBorrowing(address tokenAddress) external view override returns (uint256) {
        return _totalBorrowing[tokenAddress];
    }

    /**
     * @notice Get token info
     */
    function getTokenInfo(address tokenAddress)
        external
        view
        override
        returns (uint256 totalLendAmount, uint256 totalBorrowAmount)
    {
        totalLendAmount = _totalLending[tokenAddress];
        totalBorrowAmount = _totalBorrowing[tokenAddress];
    }

    /**
     * @return total lending amount of the token belonging to the user
     */
    function getLenderAccount(address tokenAddress, address userAddress)
        external
        view
        override
        returns (uint256)
    {
        bytes32 account = keccak256(abi.encode(tokenAddress, userAddress));
        return _lenderAccount[account];
    }

    /**
     * @return total borrowing amount of the token belonging to the user
     */
    function getBorrowerAccount(address tokenAddress, address userAddress)
        external
        view
        override
        returns (uint256)
    {
        bytes32 account = keccak256(abi.encode(tokenAddress, userAddress));
        return _borrowerAccount[account];
    }

    /**
     * @return remaining credit amount of the token belonging to the user
     */
    function getRemainingCredit(address tokenAddress, address userAddress)
        external
        view
        override
        returns (uint256)
    {
        bytes32 account = keccak256(abi.encode(tokenAddress, userAddress));
        return _remainingCredit[account];
    }

    /**
     * @notice Get account info of the token belonging to the user
     */
    function getAccountInfo(address tokenAddress, address userAddress)
        external
        view
        override
        returns (
            uint256 lendAccount,
            uint256 borrowAccount,
            uint256 remainingCredit
        )
    {
        bytes32 account = keccak256(abi.encode(tokenAddress, userAddress));
        lendAccount = _lenderAccount[account];
        borrowAccount = _borrowerAccount[account];
        remainingCredit = _remainingCredit[account];
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000b6a439237b6705df8f6cd8e285a41c1e9a8a6a95000000000000000000000000a383c8390adbcd387db93babdf3f30308391bd570000000000000000000000000000000000000000000000000000000000000005

-----Decoded View---------------
Arg [0] : taxTokenAddress (address): 0xB6A439237b6705DF8f6cD8e285A41c1e9a8a6A95
Arg [1] : stakingAddress (address): 0xA383C8390aDbCd387DB93BabdF3F30308391Bd57
Arg [2] : interestE3 (uint256): 5

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000b6a439237b6705df8f6cd8e285a41c1e9a8a6a95
Arg [1] : 000000000000000000000000a383c8390adbcd387db93babdf3f30308391bd57
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000005

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