This sample demonstrates how to create a Google Chat app that requests authorization from the user to make API calls on their behalf. The first time the user interacts with the app, it requests offline OAuth credentials for the user and saves them to storage. If the user interacts with the app again, the saved credentials are used so the app can make API calls on behalf of the user without asking for authorization again. Once saved, the OAuth credentials could even be used without any further user interactions.

This app is built using Apps Script and leverages Google's OAuth2 for authorization and Apps Script's User Properties for data storage. It replies with a Chat message that contains the link to a Meet space that was created calling the Google Meet API with their consent.

Key Features:

• User Authorization: Securely requests user consent to call Meet API with their credentials.
• Meet API Integration: Calls Meet REST API to create a new Meet space on behalf of the user.
• Google Chat Integration: Responds to DMs and @mentions in Google Chat. If necessary, request configuration to start an OAuth authorization flow.
• Apps Script Deployment: Provides step-by-step instructions for deploying to Apps Script.

• Apps Script Project: Create
• Google Cloud Project: Create

1. Enable APIs:

   • Enable the Meet, and Google Chat APIs using the console.

2. Deploy Apps Script Project:

   • Open the project from Apps Script console.
   • In Project Settings, enable the option Show "appsscript.json" manifest file in editor and copy the Script ID.
   • In Editor, replace the source files appsscript.json and Code.gs with the ones found in this directory.
   • Click Deploy then Test deployments from the top right corner.
   • In the opened dialog, click Install and copy the Head Deployment ID.

3. Create and Use OAuth Client ID:

   • In your Google Cloud project, go to APIs & Services > Credentials.
   • Click Create Credentials > OAuth client ID.
   • Select Web application as the application type.
   • Add https://script.google.com/macros/d/<Script ID from the previous step>/usercallback to Authorized redirect URIs.
   • Download the JSON file and rename it to client_secrets.json.

4. Configure Apps Script Project Auth:

   • Go to back to the project from Apps Script console.
   • In Editor, open the source file Code.gs.
   • Set the varibale value CLIENT_SECRETS to the entire content of the file client_secrets.json from the previous step.
   • Save to automatically deploy the change.

• Go to Google Chat API and click Configuration.
• In App name, enter Connectivity App.
• In Avatar URL, enter https://developers.google.com/chat/images/quickstart-app-avatar.png.
• In Description, enter Connectivity app.
• Under Functionality, select Join spaces and group conversations.
• Under Connection settings, select Apps Script and enter the Head Deployment ID (obtained in the previous deployment steps) in Deployment ID.
• Under Commands, click Add a command, and click Done after setting:
  • Command Id to 1.
  • Description and Quick command name to Logout.
• Under Visibility, select Make this Google Chat app available to specific people and groups in your domain and enter your email address.
• Click Save.

• Message the app.
• Follow the authorization link to grant the app access to your account.
• Once authorization is complete, the app will reply with a link to the newly created Meet space.
• Message the app again, it will reply without asking for authorization.
• Execute the quick command Logout, it will deauthorizes the app.

• Authenticate and authorize Chat apps and Google Chat API requests
• Build Google Chat interfaces