Unable to authenticate Google Cloud Storage client in python

Question

I'm trying the following code to access the Google Cloud storage:

client = storage.Client(credentials = GoogleCredentials.from_stream(<path-to-service-account-json>))

Throws this error:

ValueError: This library only supports credentials from google-auth-library-python. See https://google-cloud-python.readthedocs.io/en/latest/google-cloud-auth.html for help on authentication with this library.

I'm able to authenticate discovery.build service using the same credentials(obtained using GoogleCredentials.from_stream()), but for some reason storage.Client fails to use the provided credentials.

Please let me know if I'm missing something.

Masbate

Answer 1

Got it to work with the following code:

storage_client = storage.Client.from_service_account_json(<path-to-service-account-json>)

Not sure why there are different way to authenticate the discovery API and the storage and other client APIs.

Masbate

Individual APIs use the pattern Client.from_service_account_json('/path/to/keyfile.json'). The GoogleCredentials class is part of an older library. The way to explicitly use a Credentials object with google-auth-library-python would look more like credentials = service_account.Credentials.from_service_account_file('/path/to/keyfile.json'). More docs on that method: google-auth.readthedocs.io/en/latest/user-guide.html You're probably doing discovery with that older Python API, which does use GoogleCredentials. Sorry for the confusion. – Mycorrhiza

Thank you, can't find any useful docs for this client library so your post is extra helpful. – Mcalpine