assertEquals("@fess.codelibs.local", fessConfig.getLdapSecurityPrincipal(null));
        assertEquals("@fess.codelibs.local", fessConfig.getLdapSecurityPrincipal(""));
        assertEquals("******@****.***", fessConfig.getLdapSecurityPrincipal("123456789"));
        assertEquals("******@****.***", fessConfig.getLdapSecurityPrincipal("1234567890"));

        form.purgeSuggestSearchLogDay = fessConfig.getPurgeSuggestSearchLogDay();
        form.ldapProviderUrl = fessConfig.getLdapProviderUrl();
        form.ldapSecurityPrincipal = fessConfig.getLdapSecurityPrincipal();
        form.ldapAdminSecurityPrincipal = fessConfig.getLdapAdminSecurityPrincipal();
        form.ldapAdminSecurityCredentials =

    default String getStorageBucket() {
        return getSystemProperty(Constants.STORAGE_BUCKET, StringUtil.EMPTY);
    }

    Integer getLdapMaxUsernameLengthAsInteger();

    default String getLdapSecurityPrincipal(final String username) {
        final String value;
        final int maxLength = getLdapMaxUsernameLengthAsInteger();
        if (username == null) {
            value = StringUtil.EMPTY;

                fessConfig.getLdapInitialContextFactory(), //
                fessConfig.getLdapSecurityAuthentication(), //
                fessConfig.getLdapProviderUrl(), //
                fessConfig.getLdapSecurityPrincipal(username), password);
    }

    /**
     * Creates the search environment for LDAP connection.
     *
     * @return The search environment for LDAP connection.
     */