Deeplinking using GWT History Token within a Facebook iFrame Canvas - facebook

Question

I would like to deep link directly to a GWT app page within a Facebook iFrame Canvas.
The first part is simple using GWT's History token with URLs like:
http://www.example.com/MyApp/#page1
which would open page1 within my app.
Facebook Apps use an application url like:
http://apps.facebook.com/myAppName
which frames my Canvas Callback URL
http://www.example.com/MyApp/
Is there a way to specify a canvas callback url (or bookmark url) which will take the user to a specific page rather than the index page?
Why? you may ask. Besides all the benefits of deep links...
I want the "Go To Application" url to take users to an index page w/ marketing material (the canvas callback url)
I want the "Bookmark URL" to take (likely returning) users to a login page and bypass downloading the marketing content (and that huge SWF file).

Answer 1

This may seem to be a hack but here it goes.
Facebook allows the application to tack on parameters to the url ?x=123
So I'm checking the window location to see if it contains my special 'page' parameter and loading that page. Below is my solution given that I'm using GWT + gwt-presenter's PlaceManager class.
The application deep url ends up being http://apps.facebook.com/myAppName?page=page1
EventBus eventBus = injector.getEventBus();
// Load PlaceManager so it can start listening
PlaceManager placeManager = injector.getPlaceManager();
String currentPlace = History.getToken();
String place = Window.Location.getParameter( "page" );
if (place != null && !place.isEmpty()) {
// send user to the place on the URL line
eventBus.fireEvent( new PlaceRequestEvent( new PlaceRequest( new Place (place) ) ));
} else if ("".equals(currentPlace)) {
// Nothing in URL, load default GWTpage
eventBus.fireEvent( new PlaceRequestEvent(new PlaceRequest( IndexPresenter.PLACE)));
} else {
// fire a body to the Place Manager to activate the requsted Place
placeManager.fireCurrentPlace();
}