final String username = form.username;
        final String password = form.password;
        form.clearSecurityInfo();
        try {
            final HtmlResponse loginRedirect = fessLoginAssist.loginRedirect(new LocalUserCredential(username, password), op -> {}, () -> {
                activityHelper.login(getUserBean());
                userInfoHelper.deleteUserCodeFromCookie(request);

     *
     * @return ActionResponse directing to the appropriate page based on authentication result
     */
    @Execute
    public ActionResponse index() {
        if (fessLoginAssist.getSavedUserBean().isPresent()) {
            return redirectToSearchPage().orElseGet(() -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("User is already logged in, redirecting to root.");

     *
     * @return the login manager wrapped in OptionalThing
     */
    @Override
    protected OptionalThing<LoginManager> myLoginManager() {
        return OptionalThing.of(fessLoginAssist);
    }

    // ===================================================================================
    //                                                                               Hook