cp audit-fix && update event

contracts/DODOVendingMachine/impl/DVMFunding.sol

@@ -15,11 +15,11 @@ import {IDODOCallee} from "../../intf/IDODOCallee.sol";
 contract DVMFunding is DVMVault {
     // ============ Events ============
 
-    event BuyShares(address indexed to, uint256 increaseShares, uint256 totalShares);
+    event BuyShares(address to, uint256 increaseShares, uint256 totalShares);
 
     event SellShares(
-        address indexed payer,
-        address indexed to,
+        address payer,
+        address to,
         uint256 decreaseShares,
         uint256 totalShares
     );

contracts/DODOVendingMachine/impl/DVMTrader.sol

@@ -28,6 +28,13 @@ contract DVMTrader is DVMVault {
         address trader
     );
 
+    event DODOFlashLoan(
+        address borrower,
+        address assetTo,
+        uint256 baseAmount,
+        uint256 quoteAmount
+    );
+
     // ============ Modifiers ============
 
     modifier isBuyAllow(address trader) {
@@ -70,7 +77,7 @@ contract DVMTrader is DVMVault {
             address(_QUOTE_TOKEN_),
             baseInput,
             receiveQuoteAmount,
-            tx.origin
+            msg.sender
         );
     }
 
@@ -94,7 +101,7 @@ contract DVMTrader is DVMVault {
             address(_BASE_TOKEN_),
             quoteInput,
             receiveBaseAmount,
-            tx.origin
+            msg.sender
         );
     }
 
@@ -112,7 +119,7 @@ contract DVMTrader is DVMVault {
 
         uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
         uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
-
+        
         // no input -> pure loss
         require(
             baseBalance >= _BASE_RESERVE_ || quoteBalance >= _QUOTE_RESERVE_,
@@ -147,11 +154,13 @@ contract DVMTrader is DVMVault {
                 address(_QUOTE_TOKEN_),
                 baseInput,
                 receiveQuoteAmount,
-                tx.origin
+                msg.sender
             );
         }
 
         _sync();
+        
+        emit DODOFlashLoan(msg.sender, assetTo, baseAmount, quoteAmount);
     }
 
     // ============ Query Functions ============

contracts/DODOVendingMachine/impl/DVMVault.sol

@@ -35,6 +35,16 @@ contract DVMVault is DVMStorage {
         quoteReserve = _QUOTE_RESERVE_;
     }
 
+    function getUserFeeRate(address user) external view returns (uint256 lpFeeRate, uint256 mtFeeRate) {
+        lpFeeRate = _LP_FEE_RATE_MODEL_.getFeeRate(user);
+        mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(user);
+    }
+
+    function getUserTradePermission(address user) external view returns (bool isBuyAllow, bool isSellAllow) {
+        isBuyAllow = (!_BUYING_CLOSE_ && _TRADE_PERMISSION_.isAllowed(user));
+        isSellAllow =  (!_SELLING_CLOSE_ && _TRADE_PERMISSION_.isAllowed(user));
+    }
+
     // ============ Asset In ============
 
     function getBaseInput() public view returns (uint256 input) {