How to create Wicket's session and inject to Wicket's life cycle using Servlet Filter ?

[smallufo]

2010/1/9 smallufo <small...@gmail.com>

> Hi all :
>
> I'm trying to inject something to the Wicket Session by a Generic Servlet
> Filter :
>
> public class UserFilter implements Filter
> {
>   private UserDao UserDao;
>
>   @Override
>   public void init(FilterConfig config) throws ServletException
>   {
>     WebApplicationContext wac =
> WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
>     UserDao = (UserDao) wac.getBean("userDao");
>   }
>
>   @Override
>   public void doFilter(ServletRequest req, ServletResponse res, FilterChain
> chain) throws IOException, ServletException
>   {
>
>     System.out.println(getClass().getName() + " : UserDao = " + UserDao);
>     // ... blah...
>     // do something , get user from cookie , authenticate cookie , and set
> it to Session
>     // ... blah...
>     MySession s = MySession.get(); // error occurs !
>     chain.doFilter(req, res);
>   }
>
>
> It seems I cannot get Wicket's session outside wicket's request cycle.
> I searched and found WicketSessionFilter , but it seems it is for
> "Retrieving" objects from wicket's session , not for Filter to inject
> something to wicket's session...
>
>
>
I've almost solve this problem by looking into
 org.apache.wicket.protocol.http.servlet.WicketSessionFilter , and
implements my Filter :


public class UserFilter implements Filter
{
  private String sessionKey;
  private UserDao userDao;

  @Override
  public void init(FilterConfig config) throws ServletException
  {
    WebApplicationContext wac =
WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
    userDao = (UserDao) wac.getBean("userDao");
  }

  @Override
  public void doFilter(ServletRequest req, ServletResponse res, FilterChain
chain) throws IOException, ServletException
  {
    HttpServletRequest httpServletRequest = ((HttpServletRequest)req);
    // create a httpSession if there is no session
    HttpSession httpSession = httpServletRequest.getSession(true);
    WebApplication application = (WebApplication)Application.get("MyApp");

    if (application != null)
    {
      sessionKey = application.getSessionAttributePrefix(null, "MyApp") +
Session.SESSION_ATTRIBUTE_NAME;

      //MySession extends WebSession
      MySession mySession = (MySession)httpSession.getAttribute(sessionKey);

      if (mySession != null)
        mySession.setUser(getUserFromCookies(httpServletRequest));
      else
      {
        //No mySession , need to create a MySession and inject to
httpSession

        MySession newSession = new MySession(application , ????????????); //
<----------------- How to get Request ?
        newSession.setUser(getUserFromCookies(httpServletRequest));
        httpSession.setAttribute(sessionKey, newSession);
      }
    }
    chain.doFilter(req, res);
  }
}


The problem is : when there is no Wicket's session , how do I create a
Wicket's session outside wicket's request cycle ?
WebSession needs a "org.apache.wicket.Request" to  construct  , how do I get
this Request in the filter  ?

Thanks a lot.