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# Copyright 2022 Google Inc.
#
# 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.
# [START auth_cloud_explicit_adc]
from google.cloud import storage
import google.oauth2.credentials
import google.auth
def authenticate_explicit_with_adc():
"""
List storage buckets by authenticating with ADC.
// TODO(Developer):
// 1. Before running this sample,
// set up ADC as described in https://cloud.google.com/docs/authentication/external/set-up-adc
// 2. Replace the project variable.
// 3. Make sure you have the necessary permission to list storage buckets: "storage.buckets.list"
"""
# Construct the Google credentials object which obtains the default configuration from your
# working environment.
# google.auth.default() will give you ComputeEngineCredentials
# if you are on a GCE (or other metadata server supported environments).
credentials, project_id = google.auth.default()
# If you are authenticating to a Cloud API, you can let the library include the default scope,
# https://www.googleapis.com/auth/cloud-platform, because IAM is used to provide fine-grained
# permissions for Cloud.
# If you need to provide a scope, specify it as follows:
# credentials = google.auth.default(scopes=scope)
# For more information on scopes to use,
# see: https://developers.google.com/identity/protocols/oauth2/scopes
# Construct the Storage client.
storage_client = storage.Client(credentials=credentials, project=project_id)
buckets = storage_client.list_buckets()
print("Buckets:")
for bucket in buckets:
print(bucket.name)
print("Listed all storage buckets.")
# [END auth_cloud_explicit_adc]
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