Hi Joey,
The XSRF token is stateless so you only need to call the XsrfTokenService
once per server session to obtain it. You can save it as a static variable
in a service helper class. Thereafter, you just need to call setRpcToken for
each service.
Some projects GWT.create() all services in a helper or factory class like
public class ServiceHelper {
private static SomeServiceAsync someService;
static {
(SomeServiceAsync) someService = GWT.create(SomeService.class);
}
public static getSomeService() {
return someService;
}
}
If you do this, you might initialize each service with the token when you
create it. Thereafter, client code can call ServiceHelper.getSomeService()
in order to make a request. For example, you could put the following in a
static initializer in the ServiceHelper to obtain the XSRF token when the
app loads:
XsrfTokenServiceAsync xsrf =
(XsrfTokenServiceAsync)GWT.create(XsrfTokenService.class);
((ServiceDefTarget)xsrf).setServiceEntryPoint(GWT.getModuleBaseURL() +
"xsrf");
xsrf.getNewXsrfToken(new AsyncCallback<XsrfToken>() {
public void onSuccess(XsrfToken token) {
initSomeService(token);
initNextService(token);
...
});
}
As far as handling the XSRF exception centrally, you can wrap AsyncCallback
with your own class like XsrfProtectedCallback in which you implement
onFailure(). This is a good practice anyway in order to provide uniform
error handling for your RPC calls. See HupaCallback in the Apache HupaMail
project for an example of a wrapped callback.
HTH,
/dmc
On Wed, Jul 6, 2011 at 4:33 AM, Joey <[email protected]> wrote:
> Hi All
>
> I have a big GWT project, there are many services and methods need to
> be protected. but I think it a hard work to
> change all of code what call methods as the following code from google
> document. So just want to know anybody
> has any simple way can fix XRSF problem and no need to change so many
> code for methods calling.
>
> -------------------------------------------------------------
> XsrfTokenServiceAsync xsrf =
> (XsrfTokenServiceAsync)GWT.create(XsrfTokenService.class);
> ((ServiceDefTarget)xsrf).setServiceEntryPoint(GWT.getModuleBaseURL() +
> "xsrf");
> xsrf.getNewXsrfToken(new AsyncCallback<XsrfToken>() {
>
> public void onSuccess(XsrfToken token) {
> MyServiceAsync rpc = (MyServiceAsync)GWT.create(MyService.class);
> ((HasRpcToken) rpc).setRpcToken(token);
>
> // make XSRF protected RPC call
> rpc.doStuff(new AsyncCallback<Void>() {
> // ...
> });
> }
>
> public void onFailure(Throwable caught) {
> try {
> throw caught;
> } catch (RpcTokenException e) {
> // Can be thrown for several reasons:
> // - duplicate session cookie, which may be a sign of a cookie
> // overwrite attack
> // - XSRF token cannot be generated because session cookie
> isn't
> // present
> } catch (Throwable e) {
> // unexpected
> }
> });
> -------------------------------------------------------------
>
>
> Thanks
>
> Joey
>
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--
David Chandler
Developer Programs Engineer, GWT+GAE
w: http://code.google.com/
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b: http://googlewebtoolkit.blogspot.com/
t: @googledevtools
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