docs: @Override
      public Map<String, String> getUserInfo(PortletRequest request, PortletWindow portletWindow)
              throws PortletContainerException {
  
          Map<String, String> userInfo = new HashMap<String, String>();
  
          // check to see if a CAS proxy ticket is expected by this portlet
          if (isCasProxyTicketRequested(request, portletWindow)) {
  
              // if it is, attempt to request a proxy ticket
              String proxyTicket = getProxyTicket(request);
              if (proxyTicket != null) userInfo.put(this.proxyTicketKey, proxyTicket);
          }
          return userInfo;
      }