raise

    log.debug("Loaded auth plugin from %s (module:%s, file:%s)",

              plugin, module.__name__, module.__file__)

    pluginclass = getattr(module, PLUGIN_CLASS_NAME)

    if not issubclass(pluginclass, KallitheaAuthPluginBase):

        raise TypeError("Authentication class %s.KallitheaAuthPlugin is not "

                        "a subclass of %s" % (plugin, KallitheaAuthPluginBase))

    plugin = pluginclass()

    if plugin.plugin_settings.im_func != KallitheaAuthPluginBase.plugin_settings.im_func:

        raise TypeError("Authentication class %s.KallitheaAuthPluginBase "

                        "has overridden the plugin_settings method, which is "

                        "forbidden." % plugin)

    return plugin

def get_auth_plugins():

    """Return a list of instances of plugins that are available and enabled"""

    auth_plugins = []

    for plugin_name in Setting.get_by_name("auth_plugins").app_settings_value:

        try:

            plugin = loadplugin(plugin_name)

            log.exception('Failed to load authentication module %s' % (plugin_name))

        else:

            auth_plugins.append(plugin)

    return auth_plugins

def authenticate(username, password, environ=None):

    """

    Authentication function used for access control,

    It tries to authenticate based on enabled authentication modules.

    :param username: username can be empty for container auth

    :param password: password can be empty for container auth

    :param environ: environ headers passed for container auth

    :returns: None if auth failed, user_data dict if auth is correct

    """

    auth_plugins = get_auth_plugins()

    log.debug('Authentication against %s plugins', auth_plugins)

    for plugin in auth_plugins:

        module = plugin.__class__.__module__

        log.debug('Trying authentication using ** %s **', module)

        # load plugin settings from Kallithea database

        plugin_name = plugin.name