repos/googleapis-python-bigquery-e731b40/samples/desktopapp/user_credentials.py

#!/usr/bin/env python

# 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.

"""Command-line application to run a query using user credentials.

You must supply a client secrets file, which would normally be bundled with
your application.
"""

import argparse


def main(project: str) -> None:
    # [START bigquery_auth_user_flow]
    from google_auth_oauthlib import flow

    # A local server is used as the callback URL in the auth flow.
    appflow = flow.InstalledAppFlow.from_client_secrets_file(
        "client_secrets.json", scopes=["https://www.googleapis.com/auth/bigquery"]
    )

    # This launches a local server to be used as the callback URL in the desktop
    # app auth flow. If you are accessing the application remotely, such as over
    # SSH or a remote Jupyter notebook, this flow will not work. Use the
    # `gcloud auth application-default login --no-browser` command or workload
    # identity federation to get authentication tokens, instead.
    #
    appflow.run_local_server()

    credentials = appflow.credentials
    # [END bigquery_auth_user_flow]

    # [START bigquery_auth_user_query]
    from google.cloud import bigquery

    # TODO: Uncomment the line below to set the `project` variable.
    # project = 'user-project-id'
    #
    # The `project` variable defines the project to be billed for query
    # processing. The user must have the bigquery.jobs.create permission on
    # this project to run a query. See:
    # https://cloud.google.com/bigquery/docs/access-control#permissions

    client = bigquery.Client(project=project, credentials=credentials)

    query_string = """SELECT name, SUM(number) as total
    FROM `bigquery-public-data.usa_names.usa_1910_current`
    WHERE name = 'William'
    GROUP BY name;
    """
    results = client.query_and_wait(query_string)

    # Print the results.
    for row in results:  # Wait for the job to complete.
        print("{}: {}".format(row["name"], row["total"]))
    # [END bigquery_auth_user_query]


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
    )
    parser.add_argument("project", help="Project to use for BigQuery billing.")
    args = parser.parse_args()
    main(args.project)