@Execute
    public ActionResponse index() {
        if (fessLoginAssist.getSavedUserBean().isPresent()) {
            return redirect(RootAction.class);
        }
        final SsoManager ssoManager = ComponentUtil.getSsoManager();
        final LoginCredential loginCredential = ssoManager.getLoginCredential();
        if (loginCredential == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("No user in SSO request.");

    @Execute
    public HtmlResponse index() {
        final OptionalThing<FessUserBean> userBean = getUserBean();
        activityHelper.logout(userBean);
        final String redirectUrl = userBean.map(user -> ComponentUtil.getSsoManager().logout(user)).orElse(null);
        fessLoginAssist.logout();
        userInfoHelper.deleteUserCodeFromCookie(request);
        if (StringUtil.isNotBlank(redirectUrl)) {

        });
        final LoginCredentialResolver loginResolver = new LoginCredentialResolver(resolver);
        for (final SsoAuthenticator auth : ComponentUtil.getSsoManager().getAuthenticators()) {
            auth.resolveCredential(loginResolver);
        }
    }

    public static class LoginCredentialResolver {

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        ComponentUtil.getSsoManager().register(this);
    }

    @Override
    public LoginCredential getLoginCredential() {
        return LaRequestUtil.getOptionalRequest().map(request -> {
            if (logger.isDebugEnabled()) {

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        ComponentUtil.getSsoManager().register(this);
    }

    protected synchronized org.codelibs.spnego.SpnegoAuthenticator getAuthenticator() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        return getComponent(QUERY_PARSER);
    }

    public static PermissionHelper getPermissionHelper() {
        return getComponent(PERMISSION_HELPER);
    }

    public static SsoManager getSsoManager() {
        return getComponent(SSO_MANAGER);
    }

    public static ThumbnailManager getThumbnailManager() {
        return getComponent(THUMBNAIL_MANAGER);
    }

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        ComponentUtil.getSsoManager().register(this);

        defaultSettings = new HashMap<>();
        defaultSettings.put("onelogin.saml2.strict", "true");
        defaultSettings.put("onelogin.saml2.debug", "false");

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());
        }
        ComponentUtil.getSsoManager().register(this);
        groupCache = CacheBuilder.newBuilder().expireAfterWrite(groupCacheExpiry, TimeUnit.SECONDS).build();
    }

    @Override
    public LoginCredential getLoginCredential() {