How to use the keystonemiddleware.auth_token.filter_factory function in keystonemiddleware

def setup(*args, **kwargs):
    """Set a KeystoneAuthBackend as the auth backend.

    Loads keystone settings from hil.cfg.
    """
    if not cfg.has_section(__name__):
        logger.error('No section for [%s] in hil.cfg; authentication will '
                     'not work without this. Please add this section and try '
                     'again.', __name__)
        sys.exit(1)
    keystone_cfg = {}
    for key in cfg.options(__name__):
        keystone_cfg[key] = cfg.get(__name__, key)

    # Great job with the API design Openstack! 
    factory = filter_factory(keystone_cfg)
    app.wsgi_app = factory(app.wsgi_app)

    auth.set_auth_backend(KeystoneAuthBackend())

def setup(*args, **kwargs):
    """Set a KeystoneAuthBackend as the auth backend.

    Loads keystone settings from hil.cfg.
    """
    if not cfg.has_section(__name__):
        logger.error('No section for [%s] in hil.cfg; authentication will '
                     'not work without this. Please add this section and try '
                     'again.', __name__)
        sys.exit(1)
    keystone_cfg = {}
    for key in cfg.options(__name__):
        keystone_cfg[key] = cfg.get(__name__, key)

    # Great job with the API design Openstack! 
    factory = filter_factory(keystone_cfg)
    app.wsgi_app = factory(app.wsgi_app)

    auth.set_auth_backend(KeystoneAuthBackend())

def deploy(conf, project_name):
    """Assemble the middleware pipeline leading to the placement app."""
    if conf.api.auth_strategy == 'noauth2':
        auth_middleware = auth.NoAuthMiddleware
    else:
        # Do not use 'oslo_config_project' param here as the conf
        # location may have been overridden earlier in the deployment
        # process with OS_PLACEMENT_CONFIG_DIR in wsgi.py.
        auth_middleware = auth_token.filter_factory(
            {}, oslo_config_config=conf)

    # Pass in our CORS config, if any, manually as that's a)
    # explicit, b) makes testing more straightfoward, c) let's
    # us control the use of cors by the presence of its config.
    conf.register_opts(cors.CORS_OPTS, 'cors')
    if conf.cors.allowed_origin:
        cors_middleware = oslo_middleware.CORS.factory(
            {}, **conf.cors)
    else:
        cors_middleware = None

    context_middleware = auth.PlacementKeystoneContext
    req_id_middleware = oslo_middleware.RequestId
    microversion_middleware = microversion.MicroversionMiddleware
    fault_wrap = common_api.FaultWrapper

bp = ext.plugin()
        app.register_blueprint(bp, url_prefix=bp.url_prefix)

    for code in werkzeug_exceptions.default_exceptions:
        app.register_error_handler(code, make_json_error)

    if cfg.CONF.debug and not cfg.CONF.log_exchange:
        LOG.debug('Logging of request/response exchange could be enabled '
                  'using flag --log_exchange')

    if cfg.CONF.log_exchange:
        app.wsgi_app = debug.Debug.factory(app.config)(app.wsgi_app)

    app.wsgi_app = request_id.BlazarReqIdMiddleware(app.wsgi_app)
    app.wsgi_app = request_log.RequestLog(app.wsgi_app)
    app.wsgi_app = auth_token.filter_factory(app.config)(app.wsgi_app)

    return app