ComputeEngineCredentials.createScoped copies existing AccessToken

[erlendnils1]

After upgrading com.google.oauth-client from v1.21.0 to 1.23.0 we started getting 403 ACCESS_TOKEN_SCOPE_INSUFFICIENT errors from the PlayIntegrity.decodeIntegrityToken service. This was the case until the initial AccessToken expired after which it started working again.

We obtained the credentials used (through a HttpCredentialsAdapter) to access the PlayIntegrity service in this way:

var scopedCredentials = GoogleCredentials.getApplicationDefault().createScoped(PlayIntegrityScopes.all());

The cause of the changed behavior appears to be from this commit:
7e26861
which changes the ComputeEngineCredentials.createScope implementation to copy a lot more state from the original ComputeEngineCredentials object to the new, scoped ComputeEngineCredentials object. This includes copying the AccessToken from the original, which does not seem like the desired behaviour when the scopes are updated.

We have added an immediate refresh after creating the scoped credentials to make sure we get a new access token with the correct scope. This has solved the issue for us, but I assume this may be a gotcha that affects more users.

Workaround:

var scopedCredentials = GoogleCredentials.getApplicationDefault().createScoped(PlayIntegrityScopes.all());
scopedCredentials.refresh();

[roma2341]

In google-auth-library-oauth2-http 1.19.0 i also got ACCESS_TOKEN_SCOPE_INSUFFICIENT randomly, I will try to use your fix and update library to latest version.
What is interesting is that delegatedCredential.getAccessToken() gave me null just after credential creation. But sometimes it returns an AccessToken object. is It ok ? How about calling refreshIfExpired() ? Will it help ?

[zhumin8]

In google-auth-library-oauth2-http 1.19.0 i also got ACCESS_TOKEN_SCOPE_INSUFFICIENT randomly, I will try to use your fix and update library to latest version. What is interesting is that delegatedCredential.getAccessToken() gave me null just after credential creation. But sometimes it returns an AccessToken object. is It ok ? How about calling refreshIfExpired() ? Will it help ?

Did the workaround above worked for your case? and do you mind clarifying what credential class you are using for delegatedCredential you mentioned above, is it also ComputeEngineCredentials?

[roma2341]

In google-auth-library-oauth2-http 1.19.0 i also got ACCESS_TOKEN_SCOPE_INSUFFICIENT randomly, I will try to use your fix and update library to latest version. What is interesting is that delegatedCredential.getAccessToken() gave me null just after credential creation. But sometimes it returns an AccessToken object. is It ok ? How about calling refreshIfExpired() ? Will it help ?

Did the workaround above worked for your case? and do you mind clarifying what credential class you are using for delegatedCredential you mentioned above, is it also ComputeEngineCredentials?

Yes , my issue was resolved after I added .refresh()

I had something like:

var delegatedCredentials = adminCredential
                .createDelegated(email)
                .createScoped(GOOGLE_AUTH_USER_SCOPES);

And I had ACCESS_TOKEN_SCOPE_INSUFFICIENT error frequently when uses these credentials
But after I added these line errors now not reappear:
delegatedCredential.refresh();

I still don't understand why I have to do it each time I create delegated credentials, I thought that google libraries code automatically refreshes tokens when necessary... this solution looks like a dirty hack.

[zhumin8]

@roma2341 Thanks for confirming the workaround.
This is not expected behavior and you should expect it to be fixed soon.

[turcsanyip]

@zhumin8 Thanks for fixing it! We ran into the same issue recently and I can confirm that our use case is working again with commit 079a065. Do you have an expected release date for the fix? Thanks

[zhumin8]

@turcsanyip Thanks for testing this out.
We are most like cutting a release later this week, we are working on another fix that we want to include in the same release.