}

            userCode = getUserCodeFromCookie(request);
            if (StringUtil.isBlank(userCode)) {
                userCode = getUserCodeFromUserBean(request);
                if (StringUtil.isBlank(userCode)) {
                    userCode = getId();
                }
            }

            if (StringUtil.isNotBlank(userCode)) {
                updateUserSessionId(userCode);
            }

        request.setParameter("userCode", buf.toString());
        assertEquals("12345abcde12345ABCDE", userInfoHelper.getUserCodeFromRequest(request));
        request.setParameter("userCode", buf.toString() + "_");
        assertEquals("12345abcde12345ABCDE_", userInfoHelper.getUserCodeFromRequest(request));
        request.setParameter("userCode", buf.toString() + " ");
        assertNull(userInfoHelper.getUserCodeFromRequest(request));

    }

    /**
     * Gets user information.
     *
     * @param userCode The user code.
     * @return The user information.
     */
    public OptionalEntity<UserInfo> getUserInfo(final String userCode) {
        if (StringUtil.isNotBlank(userCode)) {
            try {
                return OptionalEntity.of(userInfoCache.get(userCode));
            } catch (final ExecutionException e) {

        return new SearchLogHelper.SearchLogContext((FessConfig) ComponentUtil.getFessConfig(), new String[0], // roles
                null, // userCode
                null, // userId
                request, // request
                "127.0.0.1", // clientIp
                "" // virtualHostKey
        );
    }

                    logger.warn("Session userId mismatch. sessionId={}, requestUserId={}", sessionId, userId);
                } else if (userId == null && sessionUserId == null) {
                    // Both null (unauthenticated + no userCode) - allow by sessionId only
                    session.touch();
                    if (logger.isDebugEnabled()) {
                        logger.debug("Reusing existing session (both userId null). sessionId={}", sessionId);

        final String username = systemHelper.getUsername();
        if (!org.codelibs.fess.Constants.GUEST_USER.equals(username)) {
            return username;
        }
        // For guest users, use cookie-based userCode for session identification
        return ComponentUtil.getUserInfoHelper().getUserCode();
    }

    /**
     * Returns the maximum message length for chat messages.
     *

    /** Results per page parameter name. */
    public static final String RESULTS_PER_PAGE = "resultsPerPage";

    /** User code parameter name. */
    public static final String USER_CODE = "userCode";

    /** Search query field name for logging. */
    public static final String SEARCH_FIELD_LOG_SEARCH_QUERY = "q";

    /** Statistics report type parameter name. */