Support oauth2client >= 2.0 for service accounts

The function oauth2client.client.SignedJwtAssertionCredentials() (called in ServiceAccountCredentials() in ee/_helper.py) was removed in versions >=2.0 of oauth2client (changelog). This causes the the following exception to be raised when trying to initialize EE with service account credentials using newer versions of oauth2client:

return oauth2client.client.SignedJwtAssertionCredentials(
AttributeError: 'module' object has no attribute 'SignedJwtAssertionCredentials'

Typically I roll back oauth2client to 1.5.2, but other modules (like gcloud) rely on the newer version of oauth2client, which makes it difficult to use both modules in the app.

[jonas-eberle]

Hi, I discovered the same issue and wrote a workaround in my application based on the issue #401 you have referenced.

Instead of calling authorization = ee.ServiceAccountCredentials(MY_SERVICE_ACCOUNT, MY_PRIVATE_KEY_FILE) ee.Initialize(authorization)

you can use the following from oauth2client.service_account import ServiceAccountCredentials from ee import oauth authorization = ServiceAccountCredentials.from_p12_keyfile(MY_SERVICE_ACCOUNT, MY_PRIVATE_KEY_FILE, scopes=oauth.SCOPE) ee.Initialize(authorization)

[tylere]

Given that it works with the preferred JSON key format and the current Python API release, I would suggest closing it.