resolver.resolve(SpnegoCredential.class, credential -> {
            final String username = credential.getUserId();
            if (!ComponentUtil.getFessConfig().isAdminUser(username)) {
                return ComponentUtil.getLdapManager().login(username);
            }
            return OptionalEntity.empty();
        });
    }

    /**

    String getAuthenticationAdminUsers();

    default boolean isAdminUser(final String username) {
        return split(getAuthenticationAdminUsers(), ",").get(stream -> stream.anyMatch(s -> s.equals(username)));
    }

    boolean isLdapAdminEnabled();

    default boolean isLdapAdminEnabled(final String username) {
        if (isAdminUser(username)) {
            return false;
        }