final String favoriteUrl = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
                        final String userCode = userInfoHelper.getUserCode();

                        if (StringUtil.isBlank(userCode)) {
                            throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "No user session.");
                        }

    Integer getUserCodeMinLengthAsInteger();

    Integer getUserCodeMaxLengthAsInteger();

    default boolean isValidUserCode(final String userCode) {
        if (userCode == null) {
            return false;
        }

        final int length = userCode.length();
        if (getUserCodeMinLengthAsInteger().intValue() > length || getUserCodeMaxLengthAsInteger().intValue() < length) {
            return false;

thumbnail.crawler.enabled=true
# Interval for system monitor in thumbnail processing.
thumbnail.system.monitor.interval=60

# user

# User code settings
user.code.request.parameter=userCode
# User code minimum length.
user.code.min.length=20
# User code maximum length.
user.code.max.length=100
# User code pattern for validation.
user.code.pattern=[a-zA-Z0-9_]+