This project hosts web applications that demonstrate the implmentation of a Google Classroom add-on using Python. Current examples use the Flask framework.

These examples are intended to accompany the guided walkthroughs on the Classroom Add-ons developer site. Please refer to the site for implementation details.

• Python 3.7+

1. Create a Google Cloud Platform (GCP) project. Enable the following in the API Library:

   • Google Workspace Marketplace (GWM) SDK
   • Google Classroom API

   Visit the developer site for configuration instructions for the GWM SDK. You will also need to install the add-on for it to be visible in Google Classroom.

2. Visit your project's Credentials page. Create two credentials in the project:

   • An API Key. You can leave it as Unrestricted for the purposes of these examples.
   • An OAuth client ID.
     • The application type should be Web application.
     • Add <your server>/callback as an Authorized redirect URI. For example, https://localhost:5000/callback

   Return to the Credentials page once both have been created, then:

   • Copy your API Key and assign it to the environment variable GOOGLE_API_KEY:

     export GOOGLE_API_KEY=YOUR_COPIED_API_KEY

   • Download the OAuth2 client credentials as JSON.

3. Install Python 3.7+ and ensure that pip is available:

   python -m ensurepip --upgrade
   

4. Clone this repository and cd into the root project directory:

   git clone https://github.com/googleworkspace/python-classroom-addon
   cd python-classroom-addon
   

5. (Optional, but recommended!) Set up and activate a new Python virtual environment in the python-classroom-addon directory:

   python3 -m venv .classroom-addon-env
   source .classroom-addon-env/bin/activate
   

   When finished, use the deactivate command in your shell to exit the virtual environment.

6. cd into an example directory:

   cd flask/01-basic-app
   

7. Install the required libraries using pip:

   pip install -r requirements.txt
   

8. Inspect the main.py file and enable one option for running a server. For example, to run the web app on localhost:

   if __name__ == "__main__":
       ### OPTION 1: Unsecured localhost
       os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"
   
       # Run the application on http://localhost:5000.
       app.run(debug=True)

9. Launch the server by running the main.py file:

   python main.py
   

10. To load your app, either open the app in your browser or select your application in the Add-ons menu when creating an Assignment in Google Classroom.

• Issue tracker
• Add-ons Guide
• Classroom API REST Reference
• Using OAuth 2.0 for Web Server Applications
• OAuth 2.0 Scopes
• Google Classroom Discovery API
• Google OAuth2 Discovery API
• Classroom API Support

• Andrew Burke