Path to `client_secrets.json` cannot be specified via `config.json`

[anelendata]

Path to `client_secrets.json` cannot be specified via `config.json`

[daigotanaka]

@kgpayne Thanks for bringing it up :)
I would appreciate if you can help me by creating a PR.
I very much prefer maintaining the backward compatibility. Thx!

[kgpayne]

Looks like the way to load google service account credentials from a specified file is the google-auth package:

from google.oauth2 import service_account

credentials = service_account.Credentials.from_service_account_file(
    '/path/to/key.json')

scoped_credentials = credentials.with_scopes(
    ['https://www.googleapis.com/auth/cloud-platform'])

Ideally, to be backwards compatible, we could add a new optional credentials_path config field allowing users to specify a config file location. If none is provided, the tap would fall back on the env var via .default():

import google.auth

credentials, project = google.auth.default()

I don't mind making this change and submitting a PR 👍

[kgpayne]

Credentials can be passed directly to the Client as an argument:

from google.cloud import bigquery
from google.oauth2 import service_account

credentials = service_account.Credentials.from_service_account_file('/path/to/key.json')
client = bigquery.Client(credentials=credentials)