application_default.py

#!/usr/bin/env python

# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Example of authenticating using Application Default Credentials on
Compute Engine.

For more information, see the README.md under /compute.
"""

# [START all]

import argparse

from googleapiclient import discovery
from oauth2client.client import GoogleCredentials


def create_service():
    # Get the application default credentials. When running locally, these are
    # available after running `gcloud auth`. When running on compute
    # engine, these are available from the environment.
    credentials = GoogleCredentials.get_application_default()

    # Construct the service object for interacting with the Cloud Storage API -
    # the 'storage' service, at version 'v1'.
    return discovery.build('storage', 'v1', credentials=credentials)


def list_buckets(service, project_id):
    buckets = service.buckets().list(project=project_id).execute()
    return buckets


def main(project_id):
    service = create_service()
    buckets = list_buckets(service, project_id)
    print(buckets)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('project_id', help='Your Google Cloud Project ID.')

    args = parser.parse_args()

    main(args.project_id)
# [END all]