final LocalUserCredential userCredential = credential;
            final String username = userCredential.getUser();
            final String password = userCredential.getPassword();
            if (!fessConfig.isAdminUser(username)) {
                final OptionalEntity<FessUser> ldapUser = ComponentUtil.getLdapManager().login(username, password);
                if (ldapUser.isPresent()) {
                    return ldapUser;

    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;
        }

        runtime.registerData("editableUser", fessLoginAssist.getSavedUserBean().map(FessUserBean::isEditable).orElse(false));
        runtime.registerData("adminUser",
                fessConfig.isAdminUser(username) || fessLoginAssist.getSavedUserBean()
                        .map(user -> user.hasRoles(fessConfig.getAuthenticationAdminRolesAsArray()))
                        .orElse(false));

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

    /**