Hi Nick,

Thanks for the reply. I guess then my question is if there is any way to 
map the general Google account ID to the corresponding App Engine one. I'm 
definitely willing to run a conversion API from inside the GAE sandbox for 
this purpose, but I have no idea how to do the mapping even within GAE.

Thanks!

On Thursday, July 9, 2015 at 2:09:26 AM UTC+2, Nick (Cloud Platform 
Support) wrote:
>
> Hey tempy,
>
> This ID value is unique to the Google App Engine Users service, and won't 
> be the same as your general Google account ID. You can view the difference 
> between the two ID values by playing around with 
> http://gae-login-explainer.appspot.com/, which also explains the main 
> differences between the Google sign-in for websites button and App Engine 
> login URL methods of authentication. 
>
> Let me know if you've got any questions, and I'll do my best to help 
> clarify.
>
> On Sunday, July 5, 2015 at 2:07:53 PM UTC-4, tempy wrote:
>>
>> I have a production app on GAE that's been running for a while. I've been 
>> using the Users service for authentication, and my user entities in the 
>> datastore hold on to the unique account ID provided by the users service. 
>> Now, I want to bolt on some new functionality that will live outside of the 
>> GAE environment, but which also needs to authenticate to the existing GAE 
>> app. I've tried to do this with standard OAuth2 (as described here: 
>> https://developers.google.com/identity/sign-in/web/), but it seems that 
>> the Google IDs that are given out by OAuth2 are not the same for a given 
>> user when they login through the Users service on GAE vs regular OAuth2. 
>> Specifically, the Oauth2 produces a JWT which unpacks to something like:
>>
>> {
>>> iss: "accounts.google.com",
>>> sub: "100768731291047440489",
>>> azp: "
>>> 995713799104-tn1tj3qj8l4h1rhu0sucpb6aormqekls.apps.googleusercontent.com
>>> ",
>>> email: "[email protected] <javascript:>",
>>> at_hash: "PKaCDQBHNPH5HTbRXuAcEw",
>>> email_verified: "true"
>>>    
>>>    - ...
>>>
>>>
>>>    - }
>>>
>>>
>> The sub value in that response should contain the user's unique ID, but 
>> it doesn't match that of the Users API. So, am I missing something or is it 
>> the case that Google's IDs are only available within the context of the 
>> users service and differ outside of it? If this is indeed the case, is 
>> there any way to translate from one sort of ID to the other?
>>
>> Many thanks,
>> mike 
>>
>

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