code: def _add_missing_jwt_permission_classes(self, view_class):
          
          view_permissions = list(getattr(view_class, 'permission_classes', []))
  
          # Not all permissions are classes, some will be ConditionalPermission
          # objects from the rest_condition library. So we have to crawl all those
          # and expand them to see if our target classes are inside the
          # conditionals somewhere.
          permission_classes = []
          classes_to_add = []
          while view_permissions:
              permission = view_permissions.pop()
              if not hasattr(permission, 'perms_or_conds'):
                  permission_classes.append(permission)
              else:
                  for child in getattr(permission, 'perms_or_conds', []):
                      view_permissions.append(child)
  
          for perm_class in self._required_permission_classes:
              if not self._includes_base_class(permission_classes, perm_class):
                  log.warning(
                      u"The view %s allows Jwt Authentication but needs to include the %s permission class (adding it for you)",
                      view_class.__name__,
                      perm_class.__name__,
                  )
                  classes_to_add.append(perm_class)
  
          if classes_to_add:
              view_class.permission_classes += tuple(classes_to_add)
docs: Adds permissions classes that should exist for Jwt based authentication,
          if needed.