bugfix error 500 in user not exist

apps/gooyal_oauth2/validators.py

@@ -9,35 +9,26 @@ USER_MODEL = get_user_model()
 
 
 class MultiGatewayOAuth2Validator(OAuth2Validator):  # pylint: disable=w0223
-    """ Primarily extend the functionality of token generation """
-
     def validate_user(self, username, password, client, request, *args, **kwargs):
-        """ Here, you would be able to access the MOBILE/ OTP fields
-            which you will be sending in the request.post body. """
-        # otp = request.otp
-        # mobile = request.mobile
-        # user = AppropriateModel.objects.get(otp=otp, mobile=mobile)
         auth_fields = getattr(request, 'auth_fields', 'username:password').split(':')
-        user_field = auth_fields[0]
-        pass_field = auth_fields[1]
 
-        user = None
-        if user_field == 'phone_number':
-            user = USER_MODEL.objects.get(
-                phone_number=username
-            )
+        if len(auth_fields) != 2:
+            return False
 
-        elif user_field == 'username':
-            user = USER_MODEL.objects.get(
-                username=username
-            )
+        user_field, pass_field = auth_fields
 
-        elif user_field == 'email':
-            user = USER_MODEL.objects.get(
-                email=username
-            )
+        if user_field not in ['phone_number', 'username', 'email']:
+            return False
 
-        if user is None:
+        if pass_field not in ['password', 'otp']:
+            return False
+
+        if not username or not password:
+            return False
+
+        user = USER_MODEL.objects.filter(**{user_field:username}).first()
+
+        if not user:
             return False
 
         if not user.check_auth(pass_field, password):