code: public static void addStandardTokens(TokenFilter filter, AuthenticatedUser user) {
  
          // Default to the authenticated user's username for the GUAC_USERNAME
          // token
          filter.setToken(USERNAME_TOKEN, user.getIdentifier());
  
          // Add tokens specific to credentials
          addStandardTokens(filter, user.getCredentials());
  
      }
docs: Adds tokens which are standardized by guacamole-ext to the given
  TokenFilter using the values from the given AuthenticatedUser object,
  including any associated credentials. These standardized tokens include
  the current username (GUAC_USERNAME), password (GUAC_PASSWORD), and the
  server date and time (GUAC_DATE and GUAC_TIME respectively). If either
  the username or password are not set within the given user or their
  provided credentials, the corresponding token(s) will remain unset.
  
  @param filter
  The TokenFilter to add standard tokens to.
  
  @param user
  The AuthenticatedUser to use when populating the GUAC_USERNAME and
  GUAC_PASSWORD tokens.