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// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

import "./CErc20.sol";

/**
 * @title Ondo's CTokenDelegate Contract
 * @notice CTokens which wrap an EIP-20 underlying and are delegated to
 * @author Compound
 */
contract CTokenDelegate is CErc20, CDelegateInterface {
  /**
   * @notice Construct an empty delegate
   */
  constructor() {}

  /**
   * @notice Called by the delegator on a delegate to initialize it for duty
   * @param data The encoded bytes data for any initialization
   */
  function _becomeImplementation(bytes memory data) public virtual override {
    // Shh -- currently unused
    data;

    // Shh -- we don't ever want this hook to be marked pure
    if (false) {
      implementation = address(0);
    }

    require(
      msg.sender == admin,
      "only the admin may call _becomeImplementation"
    );
  }

  /**
   * @notice Called by the delegator on a delegate to forfeit its responsibility
   */
  function _resignImplementation() public virtual override {
    // Shh -- we don't ever want this hook to be marked pure
    if (false) {
      implementation = address(0);
    }

    require(
      msg.sender == admin,
      "only the admin may call _resignImplementation"
    );
  }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

abstract contract ComptrollerInterface {
  /// @notice Indicator that this is a Comptroller contract (for inspection)
  bool public constant isComptroller = true;

  /*** Assets You Are In ***/

  function enterMarkets(
    address[] calldata cTokens
  ) external virtual returns (uint[] memory);

  function exitMarket(address cToken) external virtual returns (uint);

  /*** Policy Hooks ***/

  function mintAllowed(
    address cToken,
    address minter,
    uint mintAmount
  ) external virtual returns (uint);

  function mintVerify(
    address cToken,
    address minter,
    uint mintAmount,
    uint mintTokens
  ) external virtual;

  function redeemAllowed(
    address cToken,
    address redeemer,
    uint redeemTokens
  ) external virtual returns (uint);

  function redeemVerify(
    address cToken,
    address redeemer,
    uint redeemAmount,
    uint redeemTokens
  ) external virtual;

  function borrowAllowed(
    address cToken,
    address borrower,
    uint borrowAmount
  ) external virtual returns (uint);

  function borrowVerify(
    address cToken,
    address borrower,
    uint borrowAmount
  ) external virtual;

  function repayBorrowAllowed(
    address cToken,
    address payer,
    address borrower,
    uint repayAmount
  ) external virtual returns (uint);

  function repayBorrowVerify(
    address cToken,
    address payer,
    address borrower,
    uint repayAmount,
    uint borrowerIndex
  ) external virtual;

  function liquidateBorrowAllowed(
    address cTokenBorrowed,
    address cTokenCollateral,
    address liquidator,
    address borrower,
    uint repayAmount
  ) external virtual returns (uint);

  function liquidateBorrowVerify(
    address cTokenBorrowed,
    address cTokenCollateral,
    address liquidator,
    address borrower,
    uint repayAmount,
    uint seizeTokens
  ) external virtual;

  function seizeAllowed(
    address cTokenCollateral,
    address cTokenBorrowed,
    address liquidator,
    address borrower,
    uint seizeTokens
  ) external virtual returns (uint);

  function seizeVerify(
    address cTokenCollateral,
    address cTokenBorrowed,
    address liquidator,
    address borrower,
    uint seizeTokens
  ) external virtual;

  function transferAllowed(
    address cToken,
    address src,
    address dst,
    uint transferTokens
  ) external virtual returns (uint);

  function transferVerify(
    address cToken,
    address src,
    address dst,
    uint transferTokens
  ) external virtual;

  /*** Liquidity/Liquidation Calculations ***/

  function liquidateCalculateSeizeTokens(
    address cTokenBorrowed,
    address cTokenCollateral,
    uint repayAmount
  ) external view virtual returns (uint, uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

/**
 * @title ERC 20 Token Standard Interface
 *  https://eips.ethereum.org/EIPS/eip-20
 */
interface EIP20Interface {
  function name() external view returns (string memory);

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

  function decimals() external view returns (uint8);

  /**
   * @notice Get the total number of tokens in circulation
   * @return The supply of tokens
   */
  function totalSupply() external view returns (uint256);

  /**
   * @notice Gets the balance of the specified address
   * @param owner The address from which the balance will be retrieved
   * @return balance The balance
   */
  function balanceOf(address owner) external view returns (uint256 balance);

  /**
   * @notice Transfer `amount` tokens from `msg.sender` to `dst`
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   * @return success Whether or not the transfer succeeded
   */
  function transfer(
    address dst,
    uint256 amount
  ) external returns (bool success);

  /**
   * @notice Transfer `amount` tokens from `src` to `dst`
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   * @return success Whether or not the transfer succeeded
   */
  function transferFrom(
    address src,
    address dst,
    uint256 amount
  ) external returns (bool success);

  /**
   * @notice Approve `spender` to transfer up to `amount` from `src`
   * @dev This will overwrite the approval amount for `spender`
   *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
   * @param spender The address of the account which may transfer tokens
   * @param amount The number of tokens that are approved (-1 means infinite)
   * @return success Whether or not the approval succeeded
   */
  function approve(
    address spender,
    uint256 amount
  ) external returns (bool success);

  /**
   * @notice Get the current allowance from `owner` for `spender`
   * @param owner The address of the account which owns the tokens to be spent
   * @param spender The address of the account which may transfer tokens
   * @return remaining The number of tokens allowed to be spent (-1 means infinite)
   */
  function allowance(
    address owner,
    address spender
  ) external view returns (uint256 remaining);

  event Transfer(address indexed from, address indexed to, uint256 amount);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 amount
  );
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

/**
 * @title EIP20NonStandardInterface
 * @dev Version of ERC20 with no return values for `transfer` and `transferFrom`
 *  See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
 */
interface EIP20NonStandardInterface {
  /**
   * @notice Get the total number of tokens in circulation
   * @return The supply of tokens
   */
  function totalSupply() external view returns (uint256);

  /**
   * @notice Gets the balance of the specified address
   * @param owner The address from which the balance will be retrieved
   * @return balance The balance
   */
  function balanceOf(address owner) external view returns (uint256 balance);

  ///
  /// !!!!!!!!!!!!!!
  /// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification
  /// !!!!!!!!!!!!!!
  ///

  /**
   * @notice Transfer `amount` tokens from `msg.sender` to `dst`
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   */
  function transfer(address dst, uint256 amount) external;

  ///
  /// !!!!!!!!!!!!!!
  /// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification
  /// !!!!!!!!!!!!!!
  ///

  /**
   * @notice Transfer `amount` tokens from `src` to `dst`
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   */
  function transferFrom(address src, address dst, uint256 amount) external;

  /**
   * @notice Approve `spender` to transfer up to `amount` from `src`
   * @dev This will overwrite the approval amount for `spender`
   *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
   * @param spender The address of the account which may transfer tokens
   * @param amount The number of tokens that are approved
   * @return success Whether or not the approval succeeded
   */
  function approve(
    address spender,
    uint256 amount
  ) external returns (bool success);

  /**
   * @notice Get the current allowance from `owner` for `spender`
   * @param owner The address of the account which owns the tokens to be spent
   * @param spender The address of the account which may transfer tokens
   * @return remaining The number of tokens allowed to be spent
   */
  function allowance(
    address owner,
    address spender
  ) external view returns (uint256 remaining);

  event Transfer(address indexed from, address indexed to, uint256 amount);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 amount
  );
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

contract ComptrollerErrorReporter {
  enum Error {
    NO_ERROR,
    UNAUTHORIZED,
    COMPTROLLER_MISMATCH,
    INSUFFICIENT_SHORTFALL,
    INSUFFICIENT_LIQUIDITY,
    INVALID_CLOSE_FACTOR,
    INVALID_COLLATERAL_FACTOR,
    INVALID_LIQUIDATION_INCENTIVE,
    MARKET_NOT_ENTERED, // no longer possible
    MARKET_NOT_LISTED,
    MARKET_ALREADY_LISTED,
    MATH_ERROR,
    NONZERO_BORROW_BALANCE,
    PRICE_ERROR,
    REJECTION,
    SNAPSHOT_ERROR,
    TOO_MANY_ASSETS,
    TOO_MUCH_REPAY
  }

  enum FailureInfo {
    ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
    ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK,
    EXIT_MARKET_BALANCE_OWED,
    EXIT_MARKET_REJECTION,
    SET_CLOSE_FACTOR_OWNER_CHECK,
    SET_CLOSE_FACTOR_VALIDATION,
    SET_COLLATERAL_FACTOR_OWNER_CHECK,
    SET_COLLATERAL_FACTOR_NO_EXISTS,
    SET_COLLATERAL_FACTOR_VALIDATION,
    SET_COLLATERAL_FACTOR_WITHOUT_PRICE,
    SET_IMPLEMENTATION_OWNER_CHECK,
    SET_LIQUIDATION_INCENTIVE_OWNER_CHECK,
    SET_LIQUIDATION_INCENTIVE_VALIDATION,
    SET_MAX_ASSETS_OWNER_CHECK,
    SET_PENDING_ADMIN_OWNER_CHECK,
    SET_PENDING_IMPLEMENTATION_OWNER_CHECK,
    SET_PRICE_ORACLE_OWNER_CHECK,
    SUPPORT_MARKET_EXISTS,
    SUPPORT_MARKET_OWNER_CHECK,
    SET_PAUSE_GUARDIAN_OWNER_CHECK
  }

  /**
   * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
   * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
   **/
  event Failure(uint error, uint info, uint detail);

  /**
   * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
   */
  function fail(Error err, FailureInfo info) internal returns (uint) {
    emit Failure(uint(err), uint(info), 0);

    return uint(err);
  }

  /**
   * @dev use this when reporting an opaque error from an upgradeable collaborator contract
   */
  function failOpaque(
    Error err,
    FailureInfo info,
    uint opaqueError
  ) internal returns (uint) {
    emit Failure(uint(err), uint(info), opaqueError);

    return uint(err);
  }
}

contract TokenErrorReporter {
  uint public constant NO_ERROR = 0; // support legacy return codes

  error TransferComptrollerRejection(uint256 errorCode);
  error TransferNotAllowed();
  error TransferNotEnough();
  error TransferTooMuch();

  error MintComptrollerRejection(uint256 errorCode);
  error MintFreshnessCheck();

  error RedeemComptrollerRejection(uint256 errorCode);
  error RedeemFreshnessCheck();
  error RedeemTransferOutNotPossible();

  error BorrowComptrollerRejection(uint256 errorCode);
  error BorrowFreshnessCheck();
  error BorrowCashNotAvailable();

  error RepayBorrowComptrollerRejection(uint256 errorCode);
  error RepayBorrowFreshnessCheck();

  error LiquidateComptrollerRejection(uint256 errorCode);
  error LiquidateFreshnessCheck();
  error LiquidateCollateralFreshnessCheck();
  error LiquidateAccrueBorrowInterestFailed(uint256 errorCode);
  error LiquidateAccrueCollateralInterestFailed(uint256 errorCode);
  error LiquidateLiquidatorIsBorrower();
  error LiquidateCloseAmountIsZero();
  error LiquidateCloseAmountIsUintMax();
  error LiquidateRepayBorrowFreshFailed(uint256 errorCode);

  error LiquidateSeizeComptrollerRejection(uint256 errorCode);
  error LiquidateSeizeLiquidatorIsBorrower();

  error AcceptAdminPendingAdminCheck();

  error SetComptrollerOwnerCheck();
  error SetPendingAdminOwnerCheck();

  error SetReserveFactorAdminCheck();
  error SetReserveFactorFreshCheck();
  error SetReserveFactorBoundsCheck();

  error AddReservesFactorFreshCheck(uint256 actualAddAmount);

  error ReduceReservesAdminCheck();
  error ReduceReservesFreshCheck();
  error ReduceReservesCashNotAvailable();
  error ReduceReservesCashValidation();

  error SetInterestRateModelOwnerCheck();
  error SetInterestRateModelFreshCheck();
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

/**
 * @title Exponential module for storing fixed-precision decimals
 * @author Compound
 * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places.
 *         Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is:
 *         `Exp({mantissa: 5100000000000000000})`.
 */
contract ExponentialNoError {
  uint constant expScale = 1e18;
  uint constant doubleScale = 1e36;
  uint constant halfExpScale = expScale / 2;
  uint constant mantissaOne = expScale;

  struct Exp {
    uint mantissa;
  }

  struct Double {
    uint mantissa;
  }

  /**
   * @dev Truncates the given exp to a whole number value.
   *      For example, truncate(Exp{mantissa: 15 * expScale}) = 15
   */
  function truncate(Exp memory exp) internal pure returns (uint) {
    // Note: We are not using careful math here as we're performing a division that cannot fail
    return exp.mantissa / expScale;
  }

  /**
   * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
   */
  function mul_ScalarTruncate(
    Exp memory a,
    uint scalar
  ) internal pure returns (uint) {
    Exp memory product = mul_(a, scalar);
    return truncate(product);
  }

  /**
   * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
   */
  function mul_ScalarTruncateAddUInt(
    Exp memory a,
    uint scalar,
    uint addend
  ) internal pure returns (uint) {
    Exp memory product = mul_(a, scalar);
    return add_(truncate(product), addend);
  }

  /**
   * @dev Checks if first Exp is less than second Exp.
   */
  function lessThanExp(
    Exp memory left,
    Exp memory right
  ) internal pure returns (bool) {
    return left.mantissa < right.mantissa;
  }

  /**
   * @dev Checks if left Exp <= right Exp.
   */
  function lessThanOrEqualExp(
    Exp memory left,
    Exp memory right
  ) internal pure returns (bool) {
    return left.mantissa <= right.mantissa;
  }

  /**
   * @dev Checks if left Exp > right Exp.
   */
  function greaterThanExp(
    Exp memory left,
    Exp memory right
  ) internal pure returns (bool) {
    return left.mantissa > right.mantissa;
  }

  /**
   * @dev returns true if Exp is exactly zero
   */
  function isZeroExp(Exp memory value) internal pure returns (bool) {
    return value.mantissa == 0;
  }

  function safe224(
    uint n,
    string memory errorMessage
  ) internal pure returns (uint224) {
    require(n < 2 ** 224, errorMessage);
    return uint224(n);
  }

  function safe32(
    uint n,
    string memory errorMessage
  ) internal pure returns (uint32) {
    require(n < 2 ** 32, errorMessage);
    return uint32(n);
  }

  function add_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
    return Exp({mantissa: add_(a.mantissa, b.mantissa)});
  }

  function add_(
    Double memory a,
    Double memory b
  ) internal pure returns (Double memory) {
    return Double({mantissa: add_(a.mantissa, b.mantissa)});
  }

  function add_(uint a, uint b) internal pure returns (uint) {
    return a + b;
  }

  function sub_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
    return Exp({mantissa: sub_(a.mantissa, b.mantissa)});
  }

  function sub_(
    Double memory a,
    Double memory b
  ) internal pure returns (Double memory) {
    return Double({mantissa: sub_(a.mantissa, b.mantissa)});
  }

  function sub_(uint a, uint b) internal pure returns (uint) {
    return a - b;
  }

  function mul_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
    return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale});
  }

  function mul_(Exp memory a, uint b) internal pure returns (Exp memory) {
    return Exp({mantissa: mul_(a.mantissa, b)});
  }

  function mul_(uint a, Exp memory b) internal pure returns (uint) {
    return mul_(a, b.mantissa) / expScale;
  }

  function mul_(
    Double memory a,
    Double memory b
  ) internal pure returns (Double memory) {
    return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale});
  }

  function mul_(Double memory a, uint b) internal pure returns (Double memory) {
    return Double({mantissa: mul_(a.mantissa, b)});
  }

  function mul_(uint a, Double memory b) internal pure returns (uint) {
    return mul_(a, b.mantissa) / doubleScale;
  }

  function mul_(uint a, uint b) internal pure returns (uint) {
    return a * b;
  }

  function div_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
    return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)});
  }

  function div_(Exp memory a, uint b) internal pure returns (Exp memory) {
    return Exp({mantissa: div_(a.mantissa, b)});
  }

  function div_(uint a, Exp memory b) internal pure returns (uint) {
    return div_(mul_(a, expScale), b.mantissa);
  }

  function div_(
    Double memory a,
    Double memory b
  ) internal pure returns (Double memory) {
    return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)});
  }

  function div_(Double memory a, uint b) internal pure returns (Double memory) {
    return Double({mantissa: div_(a.mantissa, b)});
  }

  function div_(uint a, Double memory b) internal pure returns (uint) {
    return div_(mul_(a, doubleScale), b.mantissa);
  }

  function div_(uint a, uint b) internal pure returns (uint) {
    return a / b;
  }

  function fraction(uint a, uint b) internal pure returns (Double memory) {
    return Double({mantissa: div_(mul_(a, doubleScale), b)});
  }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

/**
 * @title Compound's InterestRateModel Interface
 * @author Compound
 */
abstract contract InterestRateModel {
  /// @notice Indicator that this is an InterestRateModel contract (for inspection)
  bool public constant isInterestRateModel = true;

  /**
   * @notice Calculates the current borrow interest rate per block
   * @param cash The total amount of cash the market has
   * @param borrows The total amount of borrows the market has outstanding
   * @param reserves The total amount of reserves the market has
   * @return The borrow rate per block (as a percentage, and scaled by 1e18)
   */
  function getBorrowRate(
    uint cash,
    uint borrows,
    uint reserves
  ) external view virtual returns (uint);

  /**
   * @notice Calculates the current supply interest rate per block
   * @param cash The total amount of cash the market has
   * @param borrows The total amount of borrows the market has outstanding
   * @param reserves The total amount of reserves the market has
   * @param reserveFactorMantissa The current reserve factor the market has
   * @return The supply rate per block (as a percentage, and scaled by 1e18)
   */
  function getSupplyRate(
    uint cash,
    uint borrows,
    uint reserves,
    uint reserveFactorMantissa
  ) external view virtual returns (uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

import "./CTokenModified.sol";

interface CompLike {
  function delegate(address delegatee) external;
}

/**
 * @title Ondo's CErc20 Contract
 * @notice CTokens which wrap an EIP-20 underlying
 * @dev Compatible with CTokenModified contract
 * @author Compound + Ondo
 */
contract CErc20 is CTokenModified, CErc20Interface {
  /**
   * @notice Initialize the new money market
   * @param underlying_ The address of the underlying asset
   * @param comptroller_ The address of the Comptroller
   * @param interestRateModel_ The address of the interest rate model
   * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
   * @param name_ ERC-20 name of this token
   * @param symbol_ ERC-20 symbol of this token
   * @param decimals_ ERC-20 decimal precision of this token
   * @param kycRegistry_ KYC Registry contract address
   * @param kycRequirementGroup_ KYC Requirement group to check KYC status
   *                             against
   */
  function initialize(
    address underlying_,
    ComptrollerInterface comptroller_,
    InterestRateModel interestRateModel_,
    uint initialExchangeRateMantissa_,
    string memory name_,
    string memory symbol_,
    uint8 decimals_,
    address kycRegistry_,
    uint kycRequirementGroup_
  ) public {
    // CToken initialize does the bulk of the work
    super.initialize(
      comptroller_,
      interestRateModel_,
      initialExchangeRateMantissa_,
      name_,
      symbol_,
      decimals_,
      kycRegistry_,
      kycRequirementGroup_
    );

    // Set underlying and sanity check it
    underlying = underlying_;
    EIP20Interface(underlying).totalSupply();
  }

  /*** User Interface ***/

  /**
   * @notice Sender supplies assets into the market and receives cTokens in exchange
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param mintAmount The amount of the underlying asset to supply
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function mint(uint mintAmount) external override returns (uint) {
    mintInternal(mintAmount);
    return NO_ERROR;
  }

  /**
   * @notice Sender redeems cTokens in exchange for the underlying asset
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param redeemTokens The number of cTokens to redeem into underlying
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function redeem(uint redeemTokens) external override returns (uint) {
    redeemInternal(redeemTokens);
    return NO_ERROR;
  }

  /**
   * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param redeemAmount The amount of underlying to redeem
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function redeemUnderlying(
    uint redeemAmount
  ) external override returns (uint) {
    redeemUnderlyingInternal(redeemAmount);
    return NO_ERROR;
  }

  /**
   * @notice Sender borrows assets from the protocol to their own address
   * @param borrowAmount The amount of the underlying asset to borrow
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function borrow(uint borrowAmount) external override returns (uint) {
    borrowInternal(borrowAmount);
    return NO_ERROR;
  }

  /**
   * @notice Sender repays their own borrow
   * @param repayAmount The amount to repay, or -1 for the full outstanding amount
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function repayBorrow(uint repayAmount) external override returns (uint) {
    repayBorrowInternal(repayAmount);
    return NO_ERROR;
  }

  /**
   * @notice Sender repays a borrow belonging to borrower
   * @param borrower the account with the debt being payed off
   * @param repayAmount The amount to repay, or -1 for the full outstanding amount
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function repayBorrowBehalf(
    address borrower,
    uint repayAmount
  ) external override returns (uint) {
    repayBorrowBehalfInternal(borrower, repayAmount);
    return NO_ERROR;
  }

  /**
   * @notice The sender liquidates the borrowers collateral.
   *  The collateral seized is transferred to the liquidator.
   * @param borrower The borrower of this cToken to be liquidated
   * @param repayAmount The amount of the underlying borrowed asset to repay
   * @param cTokenCollateral The market in which to seize collateral from the borrower
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function liquidateBorrow(
    address borrower,
    uint repayAmount,
    CTokenInterface cTokenCollateral
  ) external override returns (uint) {
    liquidateBorrowInternal(borrower, repayAmount, cTokenCollateral);
    return NO_ERROR;
  }

  /**
   * @notice A public function to sweep accidental ERC-20 transfers to this contract. Tokens are sent to admin (timelock)
   * @param token The address of the ERC-20 token to sweep
   */
  function sweepToken(EIP20NonStandardInterface token) external override {
    require(
      msg.sender == admin,
      "cErc20::sweepToken: only admin can sweep tokens"
    );
    require(
      address(token) != underlying,
      "cErc20::sweepToken: can not sweep underlying token"
    );
    uint256 balance = token.balanceOf(address(this));
    token.transfer(admin, balance);
  }

  /**
   * @notice The sender adds to reserves.
   * @param addAmount The amount fo underlying token to add as reserves
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _addReserves(uint addAmount) external override returns (uint) {
    return _addReservesInternal(addAmount);
  }

  /*** Safe Token ***/

  /**
   * @notice Gets balance of this contract in terms of the underlying
   * @dev This excludes the value of the current message, if any
   * @return The quantity of underlying tokens owned by this contract
   */
  function getCashPrior() internal view virtual override returns (uint) {
    EIP20Interface token = EIP20Interface(underlying);
    return token.balanceOf(address(this));
  }

  /**
   * @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom` and reverts in that case.
   *      This will revert due to insufficient balance or insufficient allowance.
   *      This function returns the actual amount received,
   *      which may be less than `amount` if there is a fee attached to the transfer.
   *
   *      Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
   *            See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
   */
  function doTransferIn(
    address from,
    uint amount
  ) internal virtual override returns (uint) {
    // Read from storage once
    address underlying_ = underlying;
    EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying_);
    uint balanceBefore = EIP20Interface(underlying_).balanceOf(address(this));
    token.transferFrom(from, address(this), amount);

    bool success;
    assembly {
      switch returndatasize()
      case 0 {
        // This is a non-standard ERC-20
        success := not(0) // set success to true
      }
      case 32 {
        // This is a compliant ERC-20
        returndatacopy(0, 0, 32)
        success := mload(0) // Set `success = returndata` of override external call
      }
      default {
        // This is an excessively non-compliant ERC-20, revert.
        revert(0, 0)
      }
    }
    require(success, "TOKEN_TRANSFER_IN_FAILED");

    // Calculate the amount that was *actually* transferred
    uint balanceAfter = EIP20Interface(underlying_).balanceOf(address(this));
    return balanceAfter - balanceBefore; // underflow already checked above, just subtract
  }

  /**
   * @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory
   *      error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to
   *      insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified
   *      it is >= amount, this should not revert in normal conditions.
   *
   *      Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
   *            See here: https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
   */
  function doTransferOut(
    address payable to,
    uint amount
  ) internal virtual override {
    EIP20NonStandardInterface token = EIP20NonStandardInterface(underlying);
    token.transfer(to, amount);

    bool success;
    assembly {
      switch returndatasize()
      case 0 {
        // This is a non-standard ERC-20
        success := not(0) // set success to true
      }
      case 32 {
        // This is a compliant ERC-20
        returndatacopy(0, 0, 32)
        success := mload(0) // Set `success = returndata` of override external call
      }
      default {
        // This is an excessively non-compliant ERC-20, revert.
        revert(0, 0)
      }
    }
    require(success, "TOKEN_TRANSFER_OUT_FAILED");
  }

  /**
   * @notice Admin call to delegate the votes of the COMP-like underlying
   * @param compLikeDelegatee The address to delegate votes to
   * @dev CTokens whose underlying are not CompLike should revert here
   */
  function _delegateCompLikeTo(address compLikeDelegatee) external {
    require(
      msg.sender == admin,
      "only the admin may set the comp-like delegate"
    );
    CompLike(underlying).delegate(compLikeDelegatee);
  }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

import "contracts/lending/tokens/cErc20Delegate/ComptrollerInterface.sol";
import "contracts/lending/tokens/cErc20Delegate/InterestRateModel.sol";
import "contracts/lending/tokens/cErc20Delegate/EIP20NonStandardInterface.sol";
import "contracts/lending/tokens/cErc20Delegate/ErrorReporter.sol";

/// @dev Forked from cDAI implementation contract and modified
/// https://etherscan.io/address/0x3363BAe2Fc44dA742Df13CD3ee94b6bB868ea376#code
contract CTokenStorage {
  /**
   * @dev Guard variable for re-entrancy checks
   */
  bool internal _notEntered;

  /**
   * @notice EIP-20 token name for this token
   */
  string public name;

  /**
   * @notice EIP-20 token symbol for this token
   */
  string public symbol;

  /**
   * @notice EIP-20 token decimals for this token
   */
  uint8 public decimals;

  // Maximum borrow rate that can ever be applied (.0005% / block)
  uint internal constant borrowRateMaxMantissa = 0.0005e16;

  // Maximum fraction of interest that can be set aside for reserves
  uint internal constant reserveFactorMaxMantissa = 1e18;

  /**
   * @notice Administrator for this contract
   */
  address payable public admin;

  /**
   * @notice Pending administrator for this contract
   */
  address payable public pendingAdmin;

  /**
   * @notice Contract which oversees inter-cToken operations
   */
  ComptrollerInterface public comptroller;

  /**
   * @notice Model which tells what the current interest rate should be
   */
  InterestRateModel public interestRateModel;

  // Initial exchange rate used when minting the first CTokens (used when totalSupply = 0)
  uint internal initialExchangeRateMantissa;

  /**
   * @notice Fraction of interest currently set aside for reserves
   */
  uint public reserveFactorMantissa;

  /**
   * @notice Block number that interest was last accrued at
   */
  uint public accrualBlockNumber;

  /**
   * @notice Accumulator of the total earned interest rate since the opening of the market
   */
  uint public borrowIndex;

  /**
   * @notice Total amount of outstanding borrows of the underlying in this market
   */
  uint public totalBorrows;

  /**
   * @notice Total amount of reserves of the underlying held in this market
   */
  uint public totalReserves;

  /**
   * @notice Total number of tokens in circulation
   */
  uint public totalSupply;

  // Official record of token balances for each account
  mapping(address => uint) internal accountTokens;

  // Approved token transfer amounts on behalf of others
  mapping(address => mapping(address => uint)) internal transferAllowances;

  /**
   * @notice Container for borrow balance information
   * @member principal Total balance (with accrued interest), after applying the most recent balance-changing action
   * @member interestIndex Global borrowIndex as of the most recent balance-changing action
   */
  struct BorrowSnapshot {
    uint principal;
    uint interestIndex;
  }

  // Mapping of account addresses to outstanding borrow balances
  mapping(address => BorrowSnapshot) internal accountBorrows;

  /**
   * @notice Share of seized collateral that is added to reserves
   */
  uint public constant protocolSeizeShareMantissa = 1.75e16; //1.75%
}

interface ISanctionsList {
  function isSanctioned(address addr) external view returns (bool);
}

/**
 * @title IKYCRegistry
 * @author Ondo Finance
 * @notice The interface for Ondo's KYC Registry contract
 */
interface IKYCRegistry {
  /**
   * @notice Retrieves KYC status of an account
   *
   * @param kycRequirementGroup The KYC group for which we wish to check
   * @param account             The account we wish to retrieve KYC status for
   *
   * @return bool Whether the `account` is KYC'd
   */
  function getKYCStatus(
    uint256 kycRequirementGroup,
    address account
  ) external view returns (bool);
}

// KYC+Sanctions Specific Storage
contract OndoKYCStorage {
  /**
   * @dev Event for when the KYC registry reference is set
   *
   * @param oldRegistry The old registry
   * @param newRegistry The new registry
   */
  event KYCRegistrySet(address oldRegistry, address newRegistry);

  /**
   * @dev Event for when the KYC group for this client is set
   *
   * @param oldRequirementGroup The old KYC group
   * @param newRequirementGroup The new KYC group
   */
  event KYCRequirementGroupSet(
    uint256 oldRequirementGroup,
    uint256 newRequirementGroup
  );

  /**
   * @notice Pointer to sanctions oracle
   */
  ISanctionsList public constant sanctionsList =
    ISanctionsList(0x40C57923924B5c5c5455c48D93317139ADDaC8fb);

  /**
   * @notice Pointer to kycRegistry
   */
  IKYCRegistry public kycRegistry;

  /**
   * @notice Reference to KYC requirement group
   */
  uint256 public kycRequirementGroup;
}

abstract contract CTokenInterface is CTokenStorage, OndoKYCStorage {
  /**
   * @notice Indicator that this is a CToken contract (for inspection)
   */
  bool public constant isCToken = true;

  /*** Market Events ***/

  /**
   * @notice Event emitted when interest is accrued
   */
  event AccrueInterest(
    uint cashPrior,
    uint interestAccumulated,
    uint borrowIndex,
    uint totalBorrows
  );

  /**
   * @notice Event emitted when tokens are minted
   */
  event Mint(address minter, uint mintAmount, uint mintTokens);

  /**
   * @notice Event emitted when tokens are redeemed
   */
  event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);

  /**
   * @notice Event emitted when underlying is borrowed
   */
  event Borrow(
    address borrower,
    uint borrowAmount,
    uint accountBorrows,
    uint totalBorrows
  );

  /**
   * @notice Event emitted when a borrow is repaid
   */
  event RepayBorrow(
    address payer,
    address borrower,
    uint repayAmount,
    uint accountBorrows,
    uint totalBorrows
  );

  /**
   * @notice Event emitted when a borrow is liquidated
   */
  event LiquidateBorrow(
    address liquidator,
    address borrower,
    uint repayAmount,
    address cTokenCollateral,
    uint seizeTokens
  );

  /*** Admin Events ***/

  /**
   * @notice Event emitted when pendingAdmin is changed
   */
  event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

  /**
   * @notice Event emitted when pendingAdmin is accepted, which means admin is updated
   */
  event NewAdmin(address oldAdmin, address newAdmin);

  /**
   * @notice Event emitted when comptroller is changed
   */
  event NewComptroller(
    ComptrollerInterface oldComptroller,
    ComptrollerInterface newComptroller
  );

  /**
   * @notice Event emitted when interestRateModel is changed
   */
  event NewMarketInterestRateModel(
    InterestRateModel oldInterestRateModel,
    InterestRateModel newInterestRateModel
  );

  /**
   * @notice Event emitted when the reserve factor is changed
   */
  event NewReserveFactor(
    uint oldReserveFactorMantissa,
    uint newReserveFactorMantissa
  );

  /**
   * @notice Event emitted when the reserves are added
   */
  event ReservesAdded(
    address benefactor,
    uint addAmount,
    uint newTotalReserves
  );

  /**
   * @notice Event emitted when the reserves are reduced
   */
  event ReservesReduced(
    address admin,
    uint reduceAmount,
    uint newTotalReserves
  );

  /**
   * @notice EIP20 Transfer event
   */
  event Transfer(address indexed from, address indexed to, uint amount);

  /**
   * @notice EIP20 Approval event
   */
  event Approval(address indexed owner, address indexed spender, uint amount);

  /*** User Interface ***/

  function transfer(address dst, uint amount) external virtual returns (bool);

  function transferFrom(
    address src,
    address dst,
    uint amount
  ) external virtual returns (bool);

  function approve(
    address spender,
    uint amount
  ) external virtual returns (bool);

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

  function balanceOf(address owner) external view virtual returns (uint);

  function balanceOfUnderlying(address owner) external virtual returns (uint);

  function getAccountSnapshot(
    address account
  ) external view virtual returns (uint, uint, uint, uint);

  function borrowRatePerBlock() external view virtual returns (uint);

  function supplyRatePerBlock() external view virtual returns (uint);

  function totalBorrowsCurrent() external virtual returns (uint);

  function borrowBalanceCurrent(
    address account
  ) external virtual returns (uint);

  function borrowBalanceStored(
    address account
  ) external view virtual returns (uint);

  function exchangeRateCurrent() external virtual returns (uint);

  function exchangeRateStored() external view virtual returns (uint);

  function getCash() external view virtual returns (uint);

  function accrueInterest() external virtual returns (uint);

  function seize(
    address liquidator,
    address borrower,
    uint seizeTokens
  ) external virtual returns (uint);

  /*** Admin Functions ***/

  function _setPendingAdmin(
    address payable newPendingAdmin
  ) external virtual returns (uint);

  function _acceptAdmin() external virtual returns (uint);

  function _setComptroller(
    ComptrollerInterface newComptroller
  ) external virtual returns (uint);

  function _setReserveFactor(
    uint newReserveFactorMantissa
  ) external virtual returns (uint);

  function _reduceReserves(uint reduceAmount) external virtual returns (uint);

  function _setInterestRateModel(
    InterestRateModel newInterestRateModel
  ) external virtual returns (uint);
}

contract CErc20Storage {
  /**
   * @notice Underlying asset for this CToken
   */
  address public underlying;
}

abstract contract CErc20Interface is CErc20Storage {
  /*** User Interface ***/

  function mint(uint mintAmount) external virtual returns (uint);

  function redeem(uint redeemTokens) external virtual returns (uint);

  function redeemUnderlying(uint redeemAmount) external virtual returns (uint);

  function borrow(uint borrowAmount) external virtual returns (uint);

  function repayBorrow(uint repayAmount) external virtual returns (uint);

  function repayBorrowBehalf(
    address borrower,
    uint repayAmount
  ) external virtual returns (uint);

  function liquidateBorrow(
    address borrower,
    uint repayAmount,
    CTokenInterface cTokenCollateral
  ) external virtual returns (uint);

  function sweepToken(EIP20NonStandardInterface token) external virtual;

  /*** Admin Functions ***/

  function _addReserves(uint addAmount) external virtual returns (uint);
}

contract CDelegationStorage {
  /**
   * @notice Implementation address for this contract
   */
  address public implementation;
}

abstract contract CDelegatorInterface is CDelegationStorage {
  /**
   * @notice Emitted when implementation is changed
   */
  event NewImplementation(address oldImplementation, address newImplementation);

  /**
   * @notice Called by the admin to update the implementation of the delegator
   * @param implementation_ The address of the new implementation for delegation
   * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation
   * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation
   */
  function _setImplementation(
    address implementation_,
    bool allowResign,
    bytes memory becomeImplementationData
  ) external virtual;
}

abstract contract CDelegateInterface is CDelegationStorage {
  /**
   * @notice Called by the delegator on a delegate to initialize it for duty
   * @dev Should revert if any issues arise which make it unfit for delegation
   * @param data The encoded bytes data for any initialization
   */
  function _becomeImplementation(bytes memory data) external virtual;

  /**
   * @notice Called by the delegator on a delegate to forfeit its responsibility
   */
  function _resignImplementation() external virtual;
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.10;

import "../cErc20Delegate/ComptrollerInterface.sol";
import "../cErc20Delegate/ErrorReporter.sol";
import "../cErc20Delegate/EIP20Interface.sol";
import "../cErc20Delegate/InterestRateModel.sol";
import "../cErc20Delegate/ExponentialNoError.sol";
import "./CTokenInterfacesModified.sol";

/**
 * @title Ondo's Generic CToken Contract
 * @notice Abstract base for CTokens w/underlying as non-CASH tokens
 * @dev Does sanctions and KYC checks on key functions
 * @author Compound + Ondo
 */
abstract contract CTokenModified is
  CTokenInterface,
  ExponentialNoError,
  TokenErrorReporter
{
  /**
   * @notice Initialize the money market
   * @param comptroller_ The address of the Comptroller
   * @param interestRateModel_ The address of the interest rate model
   * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
   * @param name_ EIP-20 name of this token
   * @param symbol_ EIP-20 symbol of this token
   * @param decimals_ EIP-20 decimal precision of this token
   * @param kycRegistry_ KYC Registry contract address
   * @param kycRequirementGroup_ KYC Requirement group to check KYC status
   *                             against
   */
  function initialize(
    ComptrollerInterface comptroller_,
    InterestRateModel interestRateModel_,
    uint initialExchangeRateMantissa_,
    string memory name_,
    string memory symbol_,
    uint8 decimals_,
    address kycRegistry_,
    uint256 kycRequirementGroup_
  ) public {
    require(msg.sender == admin, "only admin may initialize the market");
    require(
      accrualBlockNumber == 0 && borrowIndex == 0,
      "market may only be initialized once"
    );

    // Set initial exchange rate
    initialExchangeRateMantissa = initialExchangeRateMantissa_;
    require(
      initialExchangeRateMantissa > 0,
      "initial exchange rate must be greater than zero."
    );

    // Set the comptroller
    uint err = _setComptroller(comptroller_);
    require(err == NO_ERROR, "setting comptroller failed");

    // Initialize block number and borrow index (block number mocks depend on comptroller being set)
    accrualBlockNumber = getBlockNumber();
    borrowIndex = mantissaOne;

    // Set the interest rate model (depends on block number / borrow index)
    err = _setInterestRateModelFresh(interestRateModel_);
    require(err == NO_ERROR, "setting interest rate model failed");

    name = name_;
    symbol = symbol_;
    decimals = decimals_;

    // The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund)
    _notEntered = true;

    // Initialize KYCRegistryClient
    _setKYCRegistry(kycRegistry_);
    _setKYCRequirementGroup(kycRequirementGroup_);
  }

  /**
   * @notice Transfer `tokens` tokens from `src` to `dst` by `spender`
   * @dev Called by both `transfer` and `transferFrom` internally
   * @param spender The address of the account performing the transfer
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param tokens The number of tokens to transfer
   * @return 0 if the transfer succeeded, else revert
   */
  function transferTokens(
    address spender,
    address src,
    address dst,
    uint tokens
  ) internal returns (uint) {
    /* Revert if sanctioned */
    require(!sanctionsList.isSanctioned(spender), "Spender is sanctioned");
    require(!sanctionsList.isSanctioned(src), "Source is sanctioned");
    require(!sanctionsList.isSanctioned(dst), "Destination is sanctioned");

    /* Fail if transfer not allowed */
    uint allowed = comptroller.transferAllowed(address(this), src, dst, tokens);
    if (allowed != 0) {
      revert TransferComptrollerRejection(allowed);
    }

    /* Do not allow self-transfers */
    if (src == dst) {
      revert TransferNotAllowed();
    }

    /* Get the allowance, infinite for the account owner */
    uint startingAllowance = 0;
    if (spender == src) {
      startingAllowance = type(uint).max;
    } else {
      startingAllowance = transferAllowances[src][spender];
    }

    /* Do the calculations, checking for {under,over}flow */
    uint allowanceNew = startingAllowance - tokens;
    uint srcTokensNew = accountTokens[src] - tokens;
    uint dstTokensNew = accountTokens[dst] + tokens;

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    accountTokens[src] = srcTokensNew;
    accountTokens[dst] = dstTokensNew;

    /* Eat some of the allowance (if necessary) */
    if (startingAllowance != type(uint).max) {
      transferAllowances[src][spender] = allowanceNew;
    }

    /* We emit a Transfer event */
    emit Transfer(src, dst, tokens);

    // unused function
    // comptroller.transferVerify(address(this), src, dst, tokens);

    return NO_ERROR;
  }

  /**
   * @notice Transfer `amount` tokens from `msg.sender` to `dst`
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transfer(
    address dst,
    uint256 amount
  ) external override nonReentrant returns (bool) {
    return transferTokens(msg.sender, msg.sender, dst, amount) == NO_ERROR;
  }

  /**
   * @notice Transfer `amount` tokens from `src` to `dst`
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param amount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transferFrom(
    address src,
    address dst,
    uint256 amount
  ) external override nonReentrant returns (bool) {
    return transferTokens(msg.sender, src, dst, amount) == NO_ERROR;
  }

  /**
   * @notice Approve `spender` to transfer up to `amount` from `src`
   * @dev This will overwrite the approval amount for `spender`
   *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
   * @param spender The address of the account which may transfer tokens
   * @param amount The number of tokens that are approved (uint256.max means infinite)
   * @return Whether or not the approval succeeded
   */
  function approve(
    address spender,
    uint256 amount
  ) external override returns (bool) {
    address src = msg.sender;
    transferAllowances[src][spender] = amount;
    emit Approval(src, spender, amount);
    return true;
  }

  /**
   * @notice Get the current allowance from `owner` for `spender`
   * @param owner The address of the account which owns the tokens to be spent
   * @param spender The address of the account which may transfer tokens
   * @return The number of tokens allowed to be spent (-1 means infinite)
   */
  function allowance(
    address owner,
    address spender
  ) external view override returns (uint256) {
    return transferAllowances[owner][spender];
  }

  /**
   * @notice Get the token balance of the `owner`
   * @param owner The address of the account to query
   * @return The number of tokens owned by `owner`
   */
  function balanceOf(address owner) external view override returns (uint256) {
    return accountTokens[owner];
  }

  /**
   * @notice Get the underlying balance of the `owner`
   * @dev This also accrues interest in a transaction
   * @param owner The address of the account to query
   * @return The amount of underlying owned by `owner`
   */
  function balanceOfUnderlying(address owner) external override returns (uint) {
    Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()});
    return mul_ScalarTruncate(exchangeRate, accountTokens[owner]);
  }

  /**
   * @notice Get a snapshot of the account's balances, and the cached exchange rate
   * @dev This is used by comptroller to more efficiently perform liquidity checks.
   * @param account Address of the account to snapshot
   * @return (possible error, token balance, borrow balance, exchange rate mantissa)
   */
  function getAccountSnapshot(
    address account
  ) external view override returns (uint, uint, uint, uint) {
    return (
      NO_ERROR,
      accountTokens[account],
      borrowBalanceStoredInternal(account),
      exchangeRateStoredInternal()
    );
  }

  /**
   * @dev Function to simply retrieve block number
   *  This exists mainly for inheriting test contracts to stub this result.
   */
  function getBlockNumber() internal view virtual returns (uint) {
    return block.number;
  }

  /**
   * @notice Returns the current per-block borrow interest rate for this cToken
   * @return The borrow interest rate per block, scaled by 1e18
   */
  function borrowRatePerBlock() external view override returns (uint) {
    return
      interestRateModel.getBorrowRate(
        getCashPrior(),
        totalBorrows,
        totalReserves
      );
  }

  /**
   * @notice Returns the current per-block supply interest rate for this cToken
   * @return The supply interest rate per block, scaled by 1e18
   */
  function supplyRatePerBlock() external view override returns (uint) {
    return
      interestRateModel.getSupplyRate(
        getCashPrior(),
        totalBorrows,
        totalReserves,
        reserveFactorMantissa
      );
  }

  /**
   * @notice Returns the current total borrows plus accrued interest
   * @return The total borrows with interest
   */
  function totalBorrowsCurrent() external override nonReentrant returns (uint) {
    accrueInterest();
    return totalBorrows;
  }

  /**
   * @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex
   * @param account The address whose balance should be calculated after updating borrowIndex
   * @return The calculated balance
   */
  function borrowBalanceCurrent(
    address account
  ) external override nonReentrant returns (uint) {
    accrueInterest();
    return borrowBalanceStored(account);
  }

  /**
   * @notice Return the borrow balance of account based on stored data
   * @param account The address whose balance should be calculated
   * @return The calculated balance
   */
  function borrowBalanceStored(
    address account
  ) public view override returns (uint) {
    return borrowBalanceStoredInternal(account);
  }

  /**
   * @notice Return the borrow balance of account based on stored data
   * @param account The address whose balance should be calculated
   * @return (error code, the calculated balance or 0 if error code is non-zero)
   */
  function borrowBalanceStoredInternal(
    address account
  ) internal view returns (uint) {
    /* Get borrowBalance and borrowIndex */
    BorrowSnapshot storage borrowSnapshot = accountBorrows[account];

    /* If borrowBalance = 0 then borrowIndex is likely also 0.
     * Rather than failing the calculation with a division by 0, we immediately return 0 in this case.
     */
    if (borrowSnapshot.principal == 0) {
      return 0;
    }

    /* Calculate new borrow balance using the interest index:
     *  recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex
     */
    uint principalTimesIndex = borrowSnapshot.principal * borrowIndex;
    return principalTimesIndex / borrowSnapshot.interestIndex;
  }

  /**
   * @notice Accrue interest then return the up-to-date exchange rate
   * @return Calculated exchange rate scaled by 1e18
   */
  function exchangeRateCurrent() public override nonReentrant returns (uint) {
    accrueInterest();
    return exchangeRateStored();
  }

  /**
   * @notice Calculates the exchange rate from the underlying to the CToken
   * @dev This function does not accrue interest before calculating the exchange rate
   * @return Calculated exchange rate scaled by 1e18
   */
  function exchangeRateStored() public view override returns (uint) {
    return exchangeRateStoredInternal();
  }

  /**
   * @notice Calculates the exchange rate from the underlying to the CToken
   * @dev This function does not accrue interest before calculating the exchange rate
   * @return calculated exchange rate scaled by 1e18
   */
  function exchangeRateStoredInternal() internal view virtual returns (uint) {
    uint _totalSupply = totalSupply;
    if (_totalSupply == 0) {
      /*
       * If there are no tokens minted:
       *  exchangeRate = initialExchangeRate
       */
      return initialExchangeRateMantissa;
    } else {
      /*
       * Otherwise:
       *  exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply
       */
      uint totalCash = getCashPrior();
      uint cashPlusBorrowsMinusReserves = totalCash +
        totalBorrows -
        totalReserves;
      uint exchangeRate = (cashPlusBorrowsMinusReserves * expScale) /
        _totalSupply;

      return exchangeRate;
    }
  }

  /**
   * @notice Get cash balance of this cToken in the underlying asset
   * @return The quantity of underlying asset owned by this contract
   */
  function getCash() external view override returns (uint) {
    return getCashPrior();
  }

  /**
   * @notice Applies accrued interest to total borrows and reserves
   * @dev This calculates interest accrued from the last checkpointed block
   *   up to the current block and writes new checkpoint to storage.
   */
  function accrueInterest() public virtual override returns (uint) {
    /* Remember the initial block number */
    uint currentBlockNumber = getBlockNumber();
    uint accrualBlockNumberPrior = accrualBlockNumber;

    /* Short-circuit accumulating 0 interest */
    if (accrualBlockNumberPrior == currentBlockNumber) {
      return NO_ERROR;
    }

    /* Read the previous values out of storage */
    uint cashPrior = getCashPrior();
    uint borrowsPrior = totalBorrows;
    uint reservesPrior = totalReserves;
    uint borrowIndexPrior = borrowIndex;

    /* Calculate the current borrow interest rate */
    uint borrowRateMantissa = interestRateModel.getBorrowRate(
      cashPrior,
      borrowsPrior,
      reservesPrior
    );
    require(
      borrowRateMantissa <= borrowRateMaxMantissa,
      "borrow rate is absurdly high"
    );

    /* Calculate the number of blocks elapsed since the last accrual */
    uint blockDelta = currentBlockNumber - accrualBlockNumberPrior;

    /*
     * Calculate the interest accumulated into borrows and reserves and the new index:
     *  simpleInterestFactor = borrowRate * blockDelta
     *  interestAccumulated = simpleInterestFactor * totalBorrows
     *  totalBorrowsNew = interestAccumulated + totalBorrows
     *  totalReservesNew = interestAccumulated * reserveFactor + totalReserves
     *  borrowIndexNew = simpleInterestFactor * borrowIndex + borrowIndex
     */

    Exp memory simpleInterestFactor = mul_(
      Exp({mantissa: borrowRateMantissa}),
      blockDelta
    );
    uint interestAccumulated = mul_ScalarTruncate(
      simpleInterestFactor,
      borrowsPrior
    );
    uint totalBorrowsNew = interestAccumulated + borrowsPrior;
    uint totalReservesNew = mul_ScalarTruncateAddUInt(
      Exp({mantissa: reserveFactorMantissa}),
      interestAccumulated,
      reservesPrior
    );
    uint borrowIndexNew = mul_ScalarTruncateAddUInt(
      simpleInterestFactor,
      borrowIndexPrior,
      borrowIndexPrior
    );

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /* We write the previously calculated values into storage */
    accrualBlockNumber = currentBlockNumber;
    borrowIndex = borrowIndexNew;
    totalBorrows = totalBorrowsNew;
    totalReserves = totalReservesNew;

    /* We emit an AccrueInterest event */
    emit AccrueInterest(
      cashPrior,
      interestAccumulated,
      borrowIndexNew,
      totalBorrowsNew
    );

    return NO_ERROR;
  }

  /**
   * @notice Sender supplies assets into the market and receives cTokens in exchange
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param mintAmount The amount of the underlying asset to supply
   */
  function mintInternal(uint mintAmount) internal nonReentrant {
    accrueInterest();
    // mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to
    mintFresh(msg.sender, mintAmount);
  }

  /**
   * @notice User supplies assets into the market and receives cTokens in exchange
   * @dev Assumes interest has already been accrued up to the current block
   * @param minter The address of the account which is supplying the assets
   * @param mintAmount The amount of the underlying asset to supply
   */
  function mintFresh(address minter, uint mintAmount) internal {
    /* Revert if sanctioned */
    require(!sanctionsList.isSanctioned(minter), "Minter is sanctioned");

    /* Fail if mint not allowed */
    uint allowed = comptroller.mintAllowed(address(this), minter, mintAmount);
    if (allowed != 0) {
      revert MintComptrollerRejection(allowed);
    }

    /* Verify market's block number equals current block number */
    if (accrualBlockNumber != getBlockNumber()) {
      revert MintFreshnessCheck();
    }

    Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()});

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /*
     *  We call `doTransferIn` for the minter and the mintAmount.
     *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
     *  `doTransferIn` reverts if anything goes wrong, since we can't be sure if
     *  side-effects occurred. The function returns the amount actually transferred,
     *  in case of a fee. On success, the cToken holds an additional `actualMintAmount`
     *  of cash.
     */
    uint actualMintAmount = doTransferIn(minter, mintAmount);

    /*
     * We get the current exchange rate and calculate the number of cTokens to be minted:
     *  mintTokens = actualMintAmount / exchangeRate
     */

    uint mintTokens = div_(actualMintAmount, exchangeRate);

    /*
     * We calculate the new total supply of cTokens and minter token balance, checking for overflow:
     *  totalSupplyNew = totalSupply + mintTokens
     *  accountTokensNew = accountTokens[minter] + mintTokens
     * And write them into storage
     */
    totalSupply = totalSupply + mintTokens;
    accountTokens[minter] = accountTokens[minter] + mintTokens;

    /* We emit a Mint event, and a Transfer event */
    emit Mint(minter, actualMintAmount, mintTokens);
    emit Transfer(address(this), minter, mintTokens);

    /* We call the defense hook */
    // unused function
    // comptroller.mintVerify(address(this), minter, actualMintAmount, mintTokens);
  }

  /**
   * @notice Sender redeems cTokens in exchange for the underlying asset
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param redeemTokens The number of cTokens to redeem into underlying
   */
  function redeemInternal(uint redeemTokens) internal nonReentrant {
    accrueInterest();
    // redeemFresh emits redeem-specific logs on errors, so we don't need to
    redeemFresh(payable(msg.sender), redeemTokens, 0);
  }

  /**
   * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset
   * @dev Accrues interest whether or not the operation succeeds, unless reverted
   * @param redeemAmount The amount of underlying to receive from redeeming cTokens
   */
  function redeemUnderlyingInternal(uint redeemAmount) internal nonReentrant {
    accrueInterest();
    // redeemFresh emits redeem-specific logs on errors, so we don't need to
    redeemFresh(payable(msg.sender), 0, redeemAmount);
  }

  /**
   * @notice User redeems cTokens in exchange for the underlying asset
   * @dev Assumes interest has already been accrued up to the current block
   * @param redeemer The address of the account which is redeeming the tokens
   * @param redeemTokensIn The number of cTokens to redeem into underlying (only one of redeemTokensIn or redeemAmountIn may be non-zero)
   * @param redeemAmountIn The number of underlying tokens to receive from redeeming cTokens (only one of redeemTokensIn or redeemAmountIn may be non-zero)
   */
  function redeemFresh(
    address payable redeemer,
    uint redeemTokensIn,
    uint redeemAmountIn
  ) internal {
    /* Revert if sanctioned */
    require(!sanctionsList.isSanctioned(redeemer), "Redeemer is sanctioned");

    require(
      redeemTokensIn == 0 || redeemAmountIn == 0,
      "one of redeemTokensIn or redeemAmountIn must be zero"
    );

    /* exchangeRate = invoke Exchange Rate Stored() */
    Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()});

    uint redeemTokens;
    uint redeemAmount;
    /* If redeemTokensIn > 0: */
    if (redeemTokensIn > 0) {
      /*
       * We calculate the exchange rate and the amount of underlying to be redeemed:
       *  redeemTokens = redeemTokensIn
       *  redeemAmount = redeemTokensIn x exchangeRateCurrent
       */
      redeemTokens = redeemTokensIn;
      redeemAmount = mul_ScalarTruncate(exchangeRate, redeemTokensIn);
    } else {
      /*
       * We get the current exchange rate and calculate the amount to be redeemed:
       *  redeemTokens = redeemAmountIn / exchangeRate
       *  redeemAmount = redeemAmountIn
       */
      redeemTokens = div_(redeemAmountIn, exchangeRate);
      redeemAmount = redeemAmountIn;
    }

    /* Fail if redeem not allowed */
    uint allowed = comptroller.redeemAllowed(
      address(this),
      redeemer,
      redeemTokens
    );
    if (allowed != 0) {
      revert RedeemComptrollerRejection(allowed);
    }

    /* Verify market's block number equals current block number */
    if (accrualBlockNumber != getBlockNumber()) {
      revert RedeemFreshnessCheck();
    }

    /* Fail gracefully if protocol has insufficient cash */
    if (getCashPrior() < redeemAmount) {
      revert RedeemTransferOutNotPossible();
    }

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /*
     * We write the previously calculated values into storage.
     *  Note: Avoid token reentrancy attacks by writing reduced supply before external transfer.
     */
    totalSupply = totalSupply - redeemTokens;
    accountTokens[redeemer] = accountTokens[redeemer] - redeemTokens;

    /*
     * We invoke doTransferOut for the redeemer and the redeemAmount.
     *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
     *  On success, the cToken has redeemAmount less of cash.
     *  doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
     */
    doTransferOut(redeemer, redeemAmount);

    /* We emit a Transfer event, and a Redeem event */
    emit Transfer(redeemer, address(this), redeemTokens);
    emit Redeem(redeemer, redeemAmount, redeemTokens);

    /* We call the defense hook */
    comptroller.redeemVerify(
      address(this),
      redeemer,
      redeemAmount,
      redeemTokens
    );
  }

  /**
   * @notice Sender borrows assets from the protocol to their own address
   * @param borrowAmount The amount of the underlying asset to borrow
   */
  function borrowInternal(uint borrowAmount) internal nonReentrant {
    accrueInterest();
    // borrowFresh emits borrow-specific logs on errors, so we don't need to
    borrowFresh(payable(msg.sender), borrowAmount);
  }

  /**
   * @notice Users borrow assets from the protocol to their own address
   * @param borrowAmount The amount of the underlying asset to borrow
   */
  function borrowFresh(address payable borrower, uint borrowAmount) internal {
    /* Revert if borrower not KYC'd */
    require(_getKYCStatus(borrower), "Borrower not KYC'd");

    /* Fail if borrow not allowed */
    uint allowed = comptroller.borrowAllowed(
      address(this),
      borrower,
      borrowAmount
    );
    if (allowed != 0) {
      revert BorrowComptrollerRejection(allowed);
    }

    /* Verify market's block number equals current block number */
    if (accrualBlockNumber != getBlockNumber()) {
      revert BorrowFreshnessCheck();
    }

    /* Fail gracefully if protocol has insufficient underlying cash */
    if (getCashPrior() < borrowAmount) {
      revert BorrowCashNotAvailable();
    }

    /*
     * We calculate the new borrower and total borrow balances, failing on overflow:
     *  accountBorrowNew = accountBorrow + borrowAmount
     *  totalBorrowsNew = totalBorrows + borrowAmount
     */
    uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower);
    uint accountBorrowsNew = accountBorrowsPrev + borrowAmount;
    uint totalBorrowsNew = totalBorrows + borrowAmount;

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /*
         * We write the previously calculated values into storage.
         *  Note: Avoid token reentrancy attacks by writing increased borrow before external transfer.
        `*/
    accountBorrows[borrower].principal = accountBorrowsNew;
    accountBorrows[borrower].interestIndex = borrowIndex;
    totalBorrows = totalBorrowsNew;

    /*
     * We invoke doTransferOut for the borrower and the borrowAmount.
     *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
     *  On success, the cToken borrowAmount less of cash.
     *  doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
     */
    doTransferOut(borrower, borrowAmount);

    /* We emit a Borrow event */
    emit Borrow(borrower, borrowAmount, accountBorrowsNew, totalBorrowsNew);
  }

  /**
   * @notice Sender repays their own borrow
   * @param repayAmount The amount to repay, or -1 for the full outstanding amount
   */
  function repayBorrowInternal(uint repayAmount) internal nonReentrant {
    accrueInterest();
    // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
    repayBorrowFresh(msg.sender, msg.sender, repayAmount);
  }

  /**
   * @notice Sender repays a borrow belonging to borrower
   * @param borrower the account with the debt being payed off
   * @param repayAmount The amount to repay, or -1 for the full outstanding amount
   */
  function repayBorrowBehalfInternal(
    address borrower,
    uint repayAmount
  ) internal nonReentrant {
    accrueInterest();
    // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
    repayBorrowFresh(msg.sender, borrower, repayAmount);
  }

  /**
   * @notice Borrows are repaid by another user (possibly the borrower).
   * @param payer the account paying off the borrow
   * @param borrower the account with the debt being payed off
   * @param repayAmount the amount of underlying tokens being returned, or -1 for the full outstanding amount
   * @return (uint) the actual repayment amount.
   */
  function repayBorrowFresh(
    address payer,
    address borrower,
    uint repayAmount
  ) internal returns (uint) {
    /* Revert if not KYC'd */
    require(_getKYCStatus(payer), "Payer not KYC'd");
    require(_getKYCStatus(borrower), "Borrower not KYC'd");

    /* Fail if repayBorrow not allowed */
    uint allowed = comptroller.repayBorrowAllowed(
      address(this),
      payer,
      borrower,
      repayAmount
    );
    if (allowed != 0) {
      revert RepayBorrowComptrollerRejection(allowed);
    }

    /* Verify market's block number equals current block number */
    if (accrualBlockNumber != getBlockNumber()) {
      revert RepayBorrowFreshnessCheck();
    }

    /* We fetch the amount the borrower owes, with accumulated interest */
    uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower);

    /* If repayAmount == -1, repayAmount = accountBorrows */
    uint repayAmountFinal = repayAmount == type(uint).max
      ? accountBorrowsPrev
      : repayAmount;

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /*
     * We call doTransferIn for the payer and the repayAmount
     *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
     *  On success, the cToken holds an additional repayAmount of cash.
     *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
     *   it returns the amount actually transferred, in case of a fee.
     */
    uint actualRepayAmount = doTransferIn(payer, repayAmountFinal);

    /*
     * We calculate the new borrower and total borrow balances, failing on underflow:
     *  accountBorrowsNew = accountBorrows - actualRepayAmount
     *  totalBorrowsNew = totalBorrows - actualRepayAmount
     */
    uint accountBorrowsNew = accountBorrowsPrev - actualRepayAmount;
    uint totalBorrowsNew = totalBorrows - actualRepayAmount;

    /* We write the previously calculated values into storage */
    accountBorrows[borrower].principal = accountBorrowsNew;
    accountBorrows[borrower].interestIndex = borrowIndex;
    totalBorrows = totalBorrowsNew;

    /* We emit a RepayBorrow event */
    emit RepayBorrow(
      payer,
      borrower,
      actualRepayAmount,
      accountBorrowsNew,
      totalBorrowsNew
    );

    return actualRepayAmount;
  }

  /**
   * @notice The sender liquidates the borrowers collateral.
   *  The collateral seized is transferred to the liquidator.
   * @param borrower The borrower of this cToken to be liquidated
   * @param cTokenCollateral The market in which to seize collateral from the borrower
   * @param repayAmount The amount of the underlying borrowed asset to repay
   */
  function liquidateBorrowInternal(
    address borrower,
    uint repayAmount,
    CTokenInterface cTokenCollateral
  ) internal nonReentrant {
    accrueInterest();

    uint error = cTokenCollateral.accrueInterest();
    if (error != NO_ERROR) {
      // accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed
      revert LiquidateAccrueCollateralInterestFailed(error);
    }

    // liquidateBorrowFresh emits borrow-specific logs on errors, so we don't need to
    liquidateBorrowFresh(msg.sender, borrower, repayAmount, cTokenCollateral);
  }

  /**
   * @notice The liquidator liquidates the borrowers collateral.
   *  The collateral seized is transferred to the liquidator.
   * @param borrower The borrower of this cToken to be liquidated
   * @param liquidator The address repaying the borrow and seizing collateral
   * @param cTokenCollateral The market in which to seize collateral from the borrower
   * @param repayAmount The amount of the underlying borrowed asset to repay
   */
  function liquidateBorrowFresh(
    address liquidator,
    address borrower,
    uint repayAmount,
    CTokenInterface cTokenCollateral
  ) internal {
    /* Fail if liquidate not allowed */
    uint allowed = comptroller.liquidateBorrowAllowed(
      address(this),
      address(cTokenCollateral),
      liquidator,
      borrower,
      repayAmount
    );
    if (allowed != 0) {
      revert LiquidateComptrollerRejection(allowed);
    }

    /* Verify market's block number equals current block number */
    if (accrualBlockNumber != getBlockNumber()) {
      revert LiquidateFreshnessCheck();
    }

    /* Verify cTokenCollateral market's block number equals current block number */
    if (cTokenCollateral.accrualBlockNumber() != getBlockNumber()) {
      revert LiquidateCollateralFreshnessCheck();
    }

    /* Fail if borrower = liquidator */
    if (borrower == liquidator) {
      revert LiquidateLiquidatorIsBorrower();
    }

    /* Fail if repayAmount = 0 */
    if (repayAmount == 0) {
      revert LiquidateCloseAmountIsZero();
    }

    /* Fail if repayAmount = -1 */
    if (repayAmount == type(uint).max) {
      revert LiquidateCloseAmountIsUintMax();
    }

    /* Fail if repayBorrow fails */
    uint actualRepayAmount = repayBorrowFresh(
      liquidator,
      borrower,
      repayAmount
    );

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /* We calculate the number of collateral tokens that will be seized */
    (uint amountSeizeError, uint seizeTokens) = comptroller
      .liquidateCalculateSeizeTokens(
        address(this),
        address(cTokenCollateral),
        actualRepayAmount
      );
    require(
      amountSeizeError == NO_ERROR,
      "LIQUIDATE_COMPTROLLER_CALCULATE_AMOUNT_SEIZE_FAILED"
    );

    /* Revert if borrower collateral token balance < seizeTokens */
    require(
      cTokenCollateral.balanceOf(borrower) >= seizeTokens,
      "LIQUIDATE_SEIZE_TOO_MUCH"
    );

    // If this is also the collateral, run seizeInternal to avoid re-entrancy, otherwise make an external call
    if (address(cTokenCollateral) == address(this)) {
      seizeInternal(address(this), liquidator, borrower, seizeTokens);
    } else {
      require(
        cTokenCollateral.seize(liquidator, borrower, seizeTokens) == NO_ERROR,
        "token seizure failed"
      );
    }

    /* We emit a LiquidateBorrow event */
    emit LiquidateBorrow(
      liquidator,
      borrower,
      actualRepayAmount,
      address(cTokenCollateral),
      seizeTokens
    );
  }

  /**
   * @notice Transfers collateral tokens (this market) to the liquidator.
   * @dev Will fail unless called by another cToken during the process of liquidation.
   *  Its absolutely critical to use msg.sender as the borrowed cToken and not a parameter.
   * @param liquidator The account receiving seized collateral
   * @param borrower The account having collateral seized
   * @param seizeTokens The number of cTokens to seize
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function seize(
    address liquidator,
    address borrower,
    uint seizeTokens
  ) external override nonReentrant returns (uint) {
    seizeInternal(msg.sender, liquidator, borrower, seizeTokens);

    return NO_ERROR;
  }

  /**
   * @notice Transfers collateral tokens (this market) to the liquidator.
   * @dev Called only during an in-kind liquidation, or by liquidateBorrow during the liquidation of another CToken.
   *  Its absolutely critical to use msg.sender as the seizer cToken and not a parameter.
   * @param seizerToken The contract seizing the collateral (i.e. borrowed cToken)
   * @param liquidator The account receiving seized collateral
   * @param borrower The account having collateral seized
   * @param seizeTokens The number of cTokens to seize
   */
  function seizeInternal(
    address seizerToken,
    address liquidator,
    address borrower,
    uint seizeTokens
  ) internal {
    /* Revert if sanctioned */
    require(
      !sanctionsList.isSanctioned(liquidator),
      "Liquidator is sanctioned"
    );
    require(!sanctionsList.isSanctioned(borrower), "Borrower is sanctioned");

    /* Fail if seize not allowed */
    uint allowed = comptroller.seizeAllowed(
      address(this),
      seizerToken,
      liquidator,
      borrower,
      seizeTokens
    );
    if (allowed != 0) {
      revert LiquidateSeizeComptrollerRejection(allowed);
    }

    /* Fail if borrower = liquidator */
    if (borrower == liquidator) {
      revert LiquidateSeizeLiquidatorIsBorrower();
    }

    /*
     * We calculate the new borrower and liquidator token balances, failing on underflow/overflow:
     *  borrowerTokensNew = accountTokens[borrower] - seizeTokens
     *  liquidatorTokensNew = accountTokens[liquidator] + seizeTokens
     */
    uint protocolSeizeTokens = mul_(
      seizeTokens,
      Exp({mantissa: protocolSeizeShareMantissa})
    );
    uint liquidatorSeizeTokens = seizeTokens - protocolSeizeTokens;
    Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()});
    uint protocolSeizeAmount = mul_ScalarTruncate(
      exchangeRate,
      protocolSeizeTokens
    );
    uint totalReservesNew = totalReserves + protocolSeizeAmount;

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /* We write the calculated values into storage */
    totalReserves = totalReservesNew;
    totalSupply = totalSupply - protocolSeizeTokens;
    accountTokens[borrower] = accountTokens[borrower] - seizeTokens;
    accountTokens[liquidator] =
      accountTokens[liquidator] +
      liquidatorSeizeTokens;

    /* Emit a Transfer event */
    emit Transfer(borrower, liquidator, liquidatorSeizeTokens);
    emit Transfer(borrower, address(this), protocolSeizeTokens);
    emit ReservesAdded(address(this), protocolSeizeAmount, totalReservesNew);
  }

  /*** Admin Functions ***/

  /**
   * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
   * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
   * @param newPendingAdmin New pending admin.
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setPendingAdmin(
    address payable newPendingAdmin
  ) external override returns (uint) {
    // Check caller = admin
    if (msg.sender != admin) {
      revert SetPendingAdminOwnerCheck();
    }

    // Save current value, if any, for inclusion in log
    address oldPendingAdmin = pendingAdmin;

    // Store pendingAdmin with value newPendingAdmin
    pendingAdmin = newPendingAdmin;

    // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
    emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

    return NO_ERROR;
  }

  /**
   * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
   * @dev Admin function for pending admin to accept role and update admin
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _acceptAdmin() external override returns (uint) {
    // Check caller is pendingAdmin and pendingAdmin ≠ address(0)
    if (msg.sender != pendingAdmin || msg.sender == address(0)) {
      revert AcceptAdminPendingAdminCheck();
    }

    // Save current values for inclusion in log
    address oldAdmin = admin;
    address oldPendingAdmin = pendingAdmin;

    // Store admin with value pendingAdmin
    admin = pendingAdmin;

    // Clear the pending value
    pendingAdmin = payable(address(0));

    emit NewAdmin(oldAdmin, admin);
    emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

    return NO_ERROR;
  }

  /**
   * @notice Sets a new comptroller for the market
   * @dev Admin function to set a new comptroller
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setComptroller(
    ComptrollerInterface newComptroller
  ) public override returns (uint) {
    // Check caller is admin
    if (msg.sender != admin) {
      revert SetComptrollerOwnerCheck();
    }

    ComptrollerInterface oldComptroller = comptroller;
    // Ensure invoke comptroller.isComptroller() returns true
    require(newComptroller.isComptroller(), "marker method returned false");

    // Set market's comptroller to newComptroller
    comptroller = newComptroller;

    // Emit NewComptroller(oldComptroller, newComptroller)
    emit NewComptroller(oldComptroller, newComptroller);

    return NO_ERROR;
  }

  /**
   * @notice accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh
   * @dev Admin function to accrue interest and set a new reserve factor
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setReserveFactor(
    uint newReserveFactorMantissa
  ) external override nonReentrant returns (uint) {
    accrueInterest();
    // _setReserveFactorFresh emits reserve-factor-specific logs on errors, so we don't need to.
    return _setReserveFactorFresh(newReserveFactorMantissa);
  }

  /**
   * @notice Sets a new reserve factor for the protocol (*requires fresh interest accrual)
   * @dev Admin function to set a new reserve factor
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setReserveFactorFresh(
    uint newReserveFactorMantissa
  ) internal returns (uint) {
    // Check caller is admin
    if (msg.sender != admin) {
      revert SetReserveFactorAdminCheck();
    }

    // Verify market's block number equals current block number
    if (accrualBlockNumber != getBlockNumber()) {
      revert SetReserveFactorFreshCheck();
    }

    // Check newReserveFactor ≤ maxReserveFactor
    if (newReserveFactorMantissa > reserveFactorMaxMantissa) {
      revert SetReserveFactorBoundsCheck();
    }

    uint oldReserveFactorMantissa = reserveFactorMantissa;
    reserveFactorMantissa = newReserveFactorMantissa;

    emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa);

    return NO_ERROR;
  }

  /**
   * @notice Accrues interest and reduces reserves by transferring from msg.sender
   * @param addAmount Amount of addition to reserves
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _addReservesInternal(
    uint addAmount
  ) internal nonReentrant returns (uint) {
    accrueInterest();

    // _addReservesFresh emits reserve-addition-specific logs on errors, so we don't need to.
    _addReservesFresh(addAmount);
    return NO_ERROR;
  }

  /**
   * @notice Add reserves by transferring from caller
   * @dev Requires fresh interest accrual
   * @param addAmount Amount of addition to reserves
   * @return (uint, uint) An error code (0=success, otherwise a failure (see ErrorReporter.sol for details)) and the actual amount added, net token fees
   */
  function _addReservesFresh(uint addAmount) internal returns (uint, uint) {
    // totalReserves + actualAddAmount
    uint totalReservesNew;
    uint actualAddAmount;

    // We fail gracefully unless market's block number equals current block number
    if (accrualBlockNumber != getBlockNumber()) {
      revert AddReservesFactorFreshCheck(actualAddAmount);
    }

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    /*
     * We call doTransferIn for the caller and the addAmount
     *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
     *  On success, the cToken holds an additional addAmount of cash.
     *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
     *  it returns the amount actually transferred, in case of a fee.
     */

    actualAddAmount = doTransferIn(msg.sender, addAmount);

    totalReservesNew = totalReserves + actualAddAmount;

    // Store reserves[n+1] = reserves[n] + actualAddAmount
    totalReserves = totalReservesNew;

    /* Emit NewReserves(admin, actualAddAmount, reserves[n+1]) */
    emit ReservesAdded(msg.sender, actualAddAmount, totalReservesNew);

    /* Return (NO_ERROR, actualAddAmount) */
    return (NO_ERROR, actualAddAmount);
  }

  /**
   * @notice Accrues interest and reduces reserves by transferring to admin
   * @param reduceAmount Amount of reduction to reserves
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _reduceReserves(
    uint reduceAmount
  ) external override nonReentrant returns (uint) {
    accrueInterest();
    // _reduceReservesFresh emits reserve-reduction-specific logs on errors, so we don't need to.
    return _reduceReservesFresh(reduceAmount);
  }

  /**
   * @notice Reduces reserves by transferring to admin
   * @dev Requires fresh interest accrual
   * @param reduceAmount Amount of reduction to reserves
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _reduceReservesFresh(uint reduceAmount) internal returns (uint) {
    // totalReserves - reduceAmount
    uint totalReservesNew;

    // Check caller is admin
    if (msg.sender != admin) {
      revert ReduceReservesAdminCheck();
    }

    // We fail gracefully unless market's block number equals current block number
    if (accrualBlockNumber != getBlockNumber()) {
      revert ReduceReservesFreshCheck();
    }

    // Fail gracefully if protocol has insufficient underlying cash
    if (getCashPrior() < reduceAmount) {
      revert ReduceReservesCashNotAvailable();
    }

    // Check reduceAmount ≤ reserves[n] (totalReserves)
    if (reduceAmount > totalReserves) {
      revert ReduceReservesCashValidation();
    }

    /////////////////////////
    // EFFECTS & INTERACTIONS
    // (No safe failures beyond this point)

    totalReservesNew = totalReserves - reduceAmount;

    // Store reserves[n+1] = reserves[n] - reduceAmount
    totalReserves = totalReservesNew;

    // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
    doTransferOut(admin, reduceAmount);

    emit ReservesReduced(admin, reduceAmount, totalReservesNew);

    return NO_ERROR;
  }

  /**
   * @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh
   * @dev Admin function to accrue interest and update the interest rate model
   * @param newInterestRateModel the new interest rate model to use
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setInterestRateModel(
    InterestRateModel newInterestRateModel
  ) public override returns (uint) {
    accrueInterest();
    // _setInterestRateModelFresh emits interest-rate-model-update-specific logs on errors, so we don't need to.
    return _setInterestRateModelFresh(newInterestRateModel);
  }

  /**
   * @notice updates the interest rate model (*requires fresh interest accrual)
   * @dev Admin function to update the interest rate model
   * @param newInterestRateModel the new interest rate model to use
   * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
   */
  function _setInterestRateModelFresh(
    InterestRateModel newInterestRateModel
  ) internal returns (uint) {
    // Used to store old model for use in the event that is emitted on success
    InterestRateModel oldInterestRateModel;

    // Check caller is admin
    if (msg.sender != admin) {
      revert SetInterestRateModelOwnerCheck();
    }

    // We fail gracefully unless market's block number equals current block number
    if (accrualBlockNumber != getBlockNumber()) {
      revert SetInterestRateModelFreshCheck();
    }

    // Track the market's current interest rate model
    oldInterestRateModel = interestRateModel;

    // Ensure invoke newInterestRateModel.isInterestRateModel() returns true
    require(
      newInterestRateModel.isInterestRateModel(),
      "marker method returned false"
    );

    // Set the interest rate model to newInterestRateModel
    interestRateModel = newInterestRateModel;

    // Emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel)
    emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel);

    return NO_ERROR;
  }

  /*** KYC ***/

  /**
   * @notice Update KYC group of the contract for which
   *         accounts are checked against
   *
   * @param _kycRequirementGroup The new KYC requirement group
   */
  function setKYCRequirementGroup(uint256 _kycRequirementGroup) external {
    require(msg.sender == admin, "Only admin can set KYC requirement group");
    _setKYCRequirementGroup(_kycRequirementGroup);
  }

  /**
   * @notice Sets the KYC registry requirement group for this
   *         client to check kyc status for
   *
   * @param _kycRequirementGroup The new KYC group
   */
  function _setKYCRequirementGroup(uint256 _kycRequirementGroup) internal {
    uint256 oldKYCLevel = kycRequirementGroup;
    kycRequirementGroup = _kycRequirementGroup;
    emit KYCRequirementGroupSet(oldKYCLevel, _kycRequirementGroup);
  }

  /**
   * @notice Update KYC registry address
   *
   * @param _kycRegistry The new KYC registry address
   */
  function setKYCRegistry(address _kycRegistry) external {
    require(msg.sender == admin, "Only admin can set KYC registry");
    _setKYCRegistry(_kycRegistry);
  }

  /**
   * @notice Sets the KYC registry address for this client
   *
   * @param _kycRegistry The new KYC registry address
   */
  function _setKYCRegistry(address _kycRegistry) internal {
    require(_kycRegistry != address(0), "KYC registry cannot be zero address");
    address oldKYCRegistry = address(kycRegistry);
    kycRegistry = IKYCRegistry(_kycRegistry);
    emit KYCRegistrySet(oldKYCRegistry, _kycRegistry);
  }

  /**
   * @notice Checks whether an address has been KYC'd
   *
   * @param account The address to check
   */
  function _getKYCStatus(address account) internal view returns (bool) {
    return kycRegistry.getKYCStatus(kycRequirementGroup, account);
  }

  /*** Safe Token ***/

  /**
   * @notice Gets balance of this contract in terms of the underlying
   * @dev This excludes the value of the current message, if any
   * @return The quantity of underlying owned by this contract
   */
  function getCashPrior() internal view virtual returns (uint);

  /**
   * @dev Performs a transfer in, reverting upon failure. Returns the amount actually transferred to the protocol, in case of a fee.
   *  This may revert due to insufficient balance or insufficient allowance.
   */
  function doTransferIn(
    address from,
    uint amount
  ) internal virtual returns (uint);

  /**
   * @dev Performs a transfer out, ideally returning an explanatory error code upon failure rather than reverting.
   *  If caller has not called checked protocol's balance, may revert due to insufficient cash held in the contract.
   *  If caller has checked protocol's balance, and verified it is >= amount, this should not revert in normal conditions.
   */
  function doTransferOut(address payable to, uint amount) internal virtual;

  /*** Reentrancy Guard ***/

  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   */
  modifier nonReentrant() {
    require(_notEntered, "re-entered");
    _notEntered = false;
    _;
    _notEntered = true; // get a gas-refund post-Istanbul
  }
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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EIP20NonStandardInterface","name":"token","type":"address"}],"name":"sweepToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBorrows","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBorrowsCurrent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalReserves","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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