@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 {