Use Application Default Credentials on Google Compute Engine to access Sheets API

Question

Does the ADC (Application Default Credentials) workflow only support Google Cloud APIs (for example, supports for Google Cloud Storage API, but not the Google Sheet API)?

Answer 1

According to this documentation, the scope that you're using requires Oauth 2.0 authorization. Therefore, a user login and consent is required.

Answer 2

Credentials are optional for the build constructor. Omit them and the Cloud Function service account will be used to authenticate against the Sheet.

from apiclient import discovery

sheets = discovery.build('sheets', 'v4')

SPREADSHEETID = '....'

result = sheets.spreadsheets().values().get(spreadsheetId=SPREADSHEETID, range='Sheet1!A:B').execute()

print result.get('values', [])