def METHOD_NAME(self, request):
    # This method shall implement the actual authorization decision
    # logic. It gets an :class:`~.OWSRequest` object as input and shall
    # return a tuple of ``(authorized, message)`` where ``authorized`` is
    # a boolean flag and ``message`` is a string containing an error
    # message in case authorization is not granted.
    #
    # This method must be overridden by concrete implementations.
    return (True, "")