GoogleCloudPlatform · tswast · Jul 19, 2017 · May 1, 2017
diff --git a/bigquery/cloud-client/.gitignore b/bigquery/cloud-client/.gitignore
@@ -0,0 +1,2 @@
+client_secrets.json
+service_account.json
diff --git a/bigquery/cloud-client/auth_snippets.py b/bigquery/cloud-client/auth_snippets.py
@@ -0,0 +1,62 @@
+# Copyright 2017 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.
+
+"""Demonstrates how to authenticate to Google BigQuery using the Google Cloud
+Client Libraries."""
+
+import argparse
+
+
+def implicit():
+    from google.cloud import bigquery
+
+    # If you don't specify credentials when constructing the client, the
+    # client library will look for credentials in the environment.
+    bigquery_client = bigquery.Client()
+
+    # Make an authenticated API request
+    datasets = list(bigquery_client.list_datasets())
+    print(datasets)
+
+
+def explicit():
+    from google.cloud import bigquery
+
+    # Explicitly use service account credentials by specifying the private key
+    # file. All clients in google-cloud-python have this helper, see
+    # https://google-cloud-python.readthedocs.io/en/latest/core/modules.html
+    #   #google.cloud.client.Client.from_service_account_json
+    bigquery_client = bigquery.Client.from_service_account_json(
+        'service_account.json')
+
+    # Make an authenticated API request
+    buckets = list(bigquery_client.list_datasets())
+    print(buckets)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+
+    subparsers = parser.add_subparsers(dest='command')
+    subparsers.add_parser('implicit', help=implicit.__doc__)
+    subparsers.add_parser('explicit', help=explicit.__doc__)
+
+    args = parser.parse_args()
+
+    if args.command == 'implicit':
+        implicit()
+    elif args.command == 'explicit':
+        explicit()
diff --git a/bigquery/cloud-client/auth_snippets_test.py b/bigquery/cloud-client/auth_snippets_test.py
@@ -0,0 +1,33 @@
+# Copyright 2017 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.
+
+import os
+
+import mock
+
+import auth_snippets
+
+
+def test_implicit():
+    auth_snippets.implicit()
+
+
+def test_explicit():
+    with open(os.environ['GOOGLE_APPLICATION_CREDENTIALS']) as creds_file:
+        creds_file_data = creds_file.read()
+
+    open_mock = mock.mock_open(read_data=creds_file_data)
+
+    with mock.patch('io.open', open_mock):
+        auth_snippets.explicit()