def valid_web_plugin(self, plugin):
        """
        Validate a web plugin, ensuring it is a web plugin and has the
        necessary fields present.

        `plugin` is a subclass of scruffy's Plugin class.
        """
        if (issubclass(plugin, WebPlugin)      and
            hasattr(plugin, 'plugin_type')      and plugin.plugin_type == 'web' and
            hasattr(plugin, 'name')             and plugin.name != None):
            return True
        return False