code: public int getDigits() throws GuacamoleException {
  
          // Validate legal number of digits
          int digits = environment.getProperty(TOTP_DIGITS, 6);
          if (digits < 6 || digits > 8)
              throw new GuacamoleServerException("TOTP codes may have no fewer "
                      + "than 6 digits and no more than 8 digits.");
  
          return digits;
  
      }
docs: Returns the number of digits which should be included in each generated
  TOTP code. If not specified, 6 will be used by default.
  
  @return
  The number of digits which should be included in each generated
  TOTP code.
  
  @throws GuacamoleException
  If the "totp-digits" property cannot be read from
  guacamole.properties.