This sample demonstrates how to create a Google Chat app that requests authorization from the user to access their Google profile information using the People API. This app is built using Python on Google App Engine (Standard Environment) and leverages Google's OAuth2 for authorization.

Key Features:

• User Authorization: Securely requests user consent to access their Google profile data.
• People API Integration: Retrieves and displays user profile information.
• Google Chat Integration: Responds to @mentions in Google Chat.
• App Engine Deployment: Provides step-by-step instructions for deploying to App Engine.

• Python 3.7 or higher: Download
• Google Cloud SDK: Install
• Google Cloud Project: Create

1. Enable APIs:

   • Enable the Cloud Datastore, People, and Google Chat APIs using the console or gcloud:

     gcloud services enable datastore.googleapis.com people.googleapis.com chat.googleapis.com

2. Initiate Deployment to App Engine:

   • Open app.yaml and replace <SERVICE_ACCOUNT> with the email address of your App Engine default service account (you can find this in the App Engine settings in Cloud Console).

   • Deploy the app:

     gcloud app deploy

3. Create and Use OAuth Client ID:

   • Get the app hostname:

     gcloud app describe | grep defaultHostname

   • In your Google Cloud project, go to APIs & Services > Credentials.

   • Click Create Credentials > OAuth client ID.

   • Select Web application as the application type.

   • Add <hostname from the previous step>/auth/callback to Authorized redirect URIs.

   • Download the JSON file and rename it to client_secrets.json in your project directory.

   • Redeploy the app with the file client_secrets.json:

     gcloud app deploy

4. Grant Datastore Permissions:

   • Grant the App Engine default service account permissions to access Datastore:

     PROJECT_ID=$(gcloud config list --format='value(core.project)')
     SERVICE_ACCOUNT_EMAIL=$(gcloud app describe | grep serviceAccount | cut -d ':' -f 2) 
     gcloud projects add-iam-policy-binding $PROJECT_ID \
      --member="serviceAccount:$SERVICE_ACCOUNT_EMAIL" \
      --role="roles/datastore.owner"

• Go to Google Chat API and click Configuration.
• Enter your App Engine app's URL (obtained in the previous deployment steps) as the HTTP endpoint URL.
• Complete the rest of the configuration as needed.

• Add the app to a Google Chat space.
• @mention the app.
• Follow the authorization link to grant the app access to your profile.
• Send messages to the app to see your profile information.
• Type logout to deauthorize the app.