Authenticating with a user account for installed apps

This guide explains how to authenticate by using user accounts for access to the BigQuery API when your app is installed onto users' machines.

To ensure the app accesses only BigQuery tables that are available to the end user, authenticate by using a user credential. A user credential can run queries against only the end user's Google Cloud project rather than the app's project. As a result, the user is billed for queries instead of the app.

Before you begin

  1. Create a Google Cloud project that represents your installed app.
  2. Install the BigQuery client libraries.
  3. Install required libraries.

    Python

    Install the oauthlib integration for Google Auth.
    pip install --upgrade google-auth-oauthlib

Setting up your client credentials

Use the following button to select a project and create the required credentials.

Get Credentials

Manually creating credentials

  1. Go to the API Credentials page in the Google Cloud Console.
  2. Fill out the required fields on the OAuth consent screen.
  3. On the Credentials page, click the Create credentials button.

    Choose OAuth client ID.

  4. Select Other as the app type, and then click Create.
  5. Download the credentials by clicking the Download JSON button.

    Download JSON.

    Save the credentials file to client_secrets.json. This file must be distributed with your app.

Authenticating and calling the API

  1. Use the client credentials to perform the OAuth 2.0 flow.

    Python

    from google_auth_oauthlib import flow
    
    # TODO: Uncomment the line below to set the `launch_browser` variable.
    # launch_browser = True
    #
    # The `launch_browser` boolean variable indicates if a local server is used
    # as the callback URL in the auth flow. A value of `True` is recommended,
    # but a local server does not work if accessing the application remotely,
    # such as over SSH or from a remote Jupyter notebook.
    
    appflow = flow.InstalledAppFlow.from_client_secrets_file(
        'client_secrets.json',
        scopes=['https://www.googleapis.com/auth/bigquery'])
    
    if launch_browser:
        appflow.run_local_server()
    else:
        appflow.run_console()
    
    credentials = appflow.credentials
  2. Use the authenticated credentials to connect to the BigQuery API.

    Python

    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;
    """
    query_job = client.query(query_string)
    
    # Print the results.
    for row in query_job.result():  # Wait for the job to complete.
        print("{}: {}".format(row['name'], row['total']))

When you run the sample code, it launches a browser that requests access to the project that is associated with the client secrets. You can use the resulting credentials to access the user's BigQuery resources because the sample requested the BigQuery scope.

What's next

  1. Learn about other ways to authenticate your app to access the BigQuery API.
  2. Learn about authentication with end user credentials for all Google Cloud APIs.
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