The Google+ login button has a striking resemblance to the Facebook Login API, and I like it.
The Facebook JS SDK has a signed_request parameter , which is provided on the client side, but which can be transferred to my server, verifying that the client side is authenticated. It is cryptographically signed by Facebook, which allows me to verify that the client is logging in without talking to Facebook on the server side.
Is there a way to do something similar with the G + JS API? In particular, I want to perform client-side authentication, then send some data to my server and make sure that the client is indeed registered with Google without initiating a server request with Google.
(I want this because I want to use the login button as a registration mechanism, I don’t want to post to Google Plus or get a friends list or something like that, which usually requires a full access token.)
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