Loading Google API JSON service account credentials in python

gistfile1.txt

import logging
import json

from oauth2client.client import SignedJwtAssertionCredentials

# P The Google API Using OAuth 2.0 for Server to Server Applications documentation
# P only seems to document using .p12 files. This is a snippet for openeing the suggested
# P JSON format key file
# P https://developers.google.com/api-client-library/python/auth/service-accounts#jwtsample

def google_get_credentials_from_serviceaccount(serviceaccount_credentials_filepath,
                                               apis=list(),
                                               logger=logging.getLogger()):

    logger.debug("getting service account credentials from [{}]".format(serviceaccount_credentials_filepath))

    if not os.path.isfile(serviceaccount_credentials_filepath):
        raise RuntimeError("No such service account credentials file {}".format(serviceaccount_credentials_filepath))

    service_account_credentails = json.load(open(serviceaccount_credentials_filepath))

    credentials = SignedJwtAssertionCredentials(service_account_credentails['client_email'],
                                                service_account_credentails['private_key'],
                                                apis)

    return credentials