docs: def restclient_admin_required(view_func):
      """
      View decorator that checks whether the user is permitted to view proxy
      restclients. Calls login_required in case the user is not authenticated.
      """
      def wrapper(request, *args, **kwargs):
          template = 'access_denied.html'
          if hasattr(settings, 'RESTCLIENTS_ADMIN_AUTH_MODULE'):
              auth_func = import_string(settings.RESTCLIENTS_ADMIN_AUTH_MODULE)
          else:
              context = {'error_msg': (
                  "Your application must define an authorization function as "
                  "RESTCLIENTS_ADMIN_AUTH_MODULE in settings.py.")}
              return render(request, template, context=context, status=401)
  
          service = args[0] if len(args) > 0 else None
          url = args[1] if len(args) > 1 else None
          if auth_func(request, service, url):
              return view_func(request, *args, **kwargs)
  
          return render(request, template, status=401)
  
      return login_required(function=wrapper)