问题
I'm writing a fairly complicated application for Glass and I'm worried about users coming in, signing up, and using the resources for my AppEngine account even though they don't have Glass and will get no benefit from it. Is there currently any way in the Mirror API to actually determine if a user has Glass?
回答1:
I think a way to verify they have Glass would be an excellent idea. This has been requested on the issues list.
In the mean time, you might want to implement "double opt-in". It is considered best practice to send a "welcome" card - you might want to extend that welcome card to tell them to acknowledge the card. This can be a fairly simple operation, and it isn't burdensome to either them or you. If they don't within some reasonable time frame (or after some reminders... or whatever), then you can probably disable your Glass activities to them.
Actually... the more I think about it, the more I like this idea even once our API quota limits are lifted...
来源：https://stackoverflow.com/questions/16947528/how-to-find-out-if-a-user-actually-has-glass