code: def auth_token_required(fn):
      
  
      @wraps(fn)
      def decorated(*args, **kwargs):
          if _check_token():
              return fn(*args, **kwargs)
          if _security._unauthorized_callback:
              return _security._unauthorized_callback()
          else:
              return _get_unauthorized_response()
      return decorated
docs: Decorator that protects endpoints using token authentication. The token
      should be added to the request by the client by using a query string
      variable with a name equal to the configuration value of
      `SECURITY_TOKEN_AUTHENTICATION_KEY` or in a request header named that of
      the configuration value of `SECURITY_TOKEN_AUTHENTICATION_HEADER`