Indeed there is no way at this time to request the token for the scope
of another app engine app. While this is a very valuable use case,
it's also a tricky one.

However there is another mechanism you can use--the same one used by
datastore_admin to copy data between apps. In many situations, App
Engine will set a "X-AppEngine-Inbound-AppId" header when one app
calls another app; if this is set, it should be trustworthy.

More info:
 
http://groups.google.com/group/google-appengine/browse_thread/thread/ef494f245c9e8076
 
http://code.google.com/appengine/docs/adminconsole/datastoreadmin.html#Grant_Permission_to_Write_to_the_Target_App

--Matthew

On Aug 31, 6:21 pm, pdknsk <[email protected]> wrote:
> I've figured it out: it doesn't work like that, but IMO it should.
> That'd be quite nice.

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