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Re: How do I support a login form embedded in templates

by Daniel Henrique Alves Lima :: Rate this Message:

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On Tue, 2009-06-30 at 16:32 +0200, André Warnier wrote:
> Daniel Henrique Alves Lima wrote:

> > 2. When user fills the form in your small login box,
> > - Send a JS XmlHttpRequest (AJAX) to a protected resource (for
> > instance protected_resource.jsp);
>
> It seems to me that you can skip the above step, no ?
> And do the following one immediately.

        I don't know if Tomcat likes a directly call to login
page/j_security_check (i think i've just had troubles using this
approach).
        I've did a similar thing to force an applet to authenticate the user
using Tomcat's declarative security in my webapp a long time ago.


>
> I think the problem is here (but probably solvable) :
> In return to a successful login by the XmlHttpRequest, the server sends
> back a page, along with a "set-cookie" header, or with embedded
> ";jsessionid=.." parameters.  

        I really don't know what is the exact moment when jsessionid is
created. I think that "set-cookie" will be handled by the browser as a
whole (just testing to be sure), but ';jsessionid=' could be a problem.
        In previous applet example, i've used javascript (called from the
applet) to ask the value of JSESSIONID cookie, after a successfully
authentication.


> This response page is received by the
> XmlHttpRequest handler.  This does not automatically (I think) mean that
> the browser (as a whole) knows about it, nor that any next outgoing
> request is going to magically include the jsessionid.

        If you create an unauthenticated session before, will Tomcat "reuse"
sessionid after authentication ? If it does, you just need to do a
request.getSession(true) in the first (unprotected) resource of your
webapp.


--
"If there must be trouble, let it be in my day,
 that my child may have peace."

Thomas Paine


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