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Receive and respond to interaction events | Google Chat

This page describes how your Google Chat app can receive and respond to user interactions, also known as Google Chat app interaction events.

This page describes how to do the following:

• Configure your Chat app to receive interaction events.
• Process the interaction event on your infrastructure.
• If appropriate, respond to interaction events.

Note: This guide explains how to build an interactive Chat app using Chat API interaction events. You can also build your Chat app as a Google Workspace add-on. To learn about which framework to use, see Build an interactive Google Chat app.

• A Business or Enterprise Google Workspace account with access to Google Chat.
• Create a Google Cloud project.
• Configure the OAuth consent screen.
• Enable the Google Chat API.

A Google Chat app interaction event represents any action that a user takes to invoke or interact with a Chat app, such as @mentioning a Chat app or adding it to a space.

When users interact with a Chat app, Google Chat sends the Chat app an interaction event, represented as an Event type in the Chat API. The Chat app can use the event to process the interaction, and optionally, respond with a message.

For each type of user interaction, Google Chat sends a different type of interaction event which helps your Chat app handle each event type accordingly. The type of interaction event is represented using the eventType object.

For example, Google Chat uses the event type ADDED_TO_SPACE for any interaction where a user adds the Chat app to a space, so that the Chat app can immediately respond with a welcome message in the space.

The following table shows common user interactions, the type of interaction event that the Chat apps receive, and how Chat apps typically respond:

To see all supported interaction events, see the EventType reference documentation.

If your Chat app opens dialogs, the interaction event contains the following additional information that you can use to process a response:

• The isDialogEvent is set to true.
• The DialogEventType clarifies whether the interaction triggers a dialog to open, submits information from a dialog, or closes a dialog.

The following table shows the common interactions with dialogs, the corresponding dialog event types, and a description of how Chat apps typically respond:

For more information, see Open interactive dialogs.

This section describes how to receive and process interaction events for your Chat app.

Not all Chat apps are interactive. For example, incoming webhooks can only send outgoing messages and can't respond to users. If you're building an interactive Chat app, you must choose an endpoint that lets your Chat app receive, process, and respond to interaction events. To learn more about designing your Chat app, see Chat apps implementation architectures.

For each of the interactive features that you want to build, you must update your configuration in the Chat API so that Google Chat can send related interaction events to your Chat app:

1. In the Google Cloud console, go to the Chat API page and click the Configuration page:

   Go to Chat API Configuration page

2. Under Interactive features, review the settings and update based on the features that you want to build:

   Field Description Functionality Required. A set of fields that determine how Chat app can interact with users. By default, users can find and message the Chat app directly in Google Chat.
   
   • Join spaces and group conversations: Users can add the Chat app to spaces and group conversations.
   Connection settings Required. The endpoint for the Chat app, which is one of the following:
   
   • HTTP endpoint URL: An HTTPS endpoint that hosts the Chat app implementation.
   • Apps Script: A deployment ID for an Apps Script project that implements a Chat app.
   • Cloud Pub/Sub topic name: A Pub/Sub topic that the Chat app subscribes to as an endpoint.
   • Dialogflow: Registers the Chat app with a Dialogflow integration. For more information, see Build a DialogflowGoogle Chat app that understands natural language.
   Commands Optional. Slash commands and quick commands for the Chat app. Commands let users request an action or use a specific feature of your Chat app. For more information, see Respond to Google Chat app commands. Link previews Optional. URL patterns that the Chat app recognizes and provides additional content for when users send links. For more information, see Preview links. Visibility Optional. Up to five individuals, or one or more Google Groups that can view and install your Chat app. Use this field to test your Chat app, or to share the Chat app with your team. For more information, see Test interactive features.

3. Click Save. When you save the Chat app configuration, your Chat app is available to the specified users in your Google Workspace organization.

Your Chat app is now configured to receive interaction events from Google Chat.

If an HTTPS request to your service fails (such as a timeout, temporary network failure, or non-2xx HTTPS status code), Google Chat might retry delivery a few times within a few minutes (but this isn't guaranteed). As a result, a Chat app might receive the same message a few times in certain situations. If the request completes successfully but returns an invalid message payload, Google Chat doesn't retry the request.

This section explains how Google Chat apps can process and respond to interaction events.

After your Chat app receives an interaction event from Google Chat, they can respond in many ways. In many cases, interactive Chat apps reply to the user with a message. Google Chat app can also look up some information from a data source, record the interaction event information, or just about anything else. This processing behavior is essentially what defines the Google Chat app.

To respond synchronously, a Chat app must respond within 30 seconds, and the response must be posted in the space where the interaction occurred. Otherwise, the Chat app can respond asynchronously.

For each interaction event, Chat apps receive a request body, which is the JSON payload that represents the event. You can use the information to process a response. For examples of event payloads, see Types of Chat app interaction events.

The following diagram demonstrates how Google Chat app typically process or respond to different types of interaction events:

Interaction events let Chat apps respond in real time, or synchronously. Synchronous responses don't require authentication.

To respond in real time, the Chat app must return a Message object. To reply with a message in the space, the Message object can contain text, cardsV2, and accessoryWidgets objects. To use with other types of responses, see the following guides:

• Open interactive dialogs
• Preview links
• Process information submitted by users

In this example, your Chat app creates and sends a text message whenever it's added to a space. To learn about best practices for onboarding users, see Introduce users to your Chat app.

To send a text message when a user adds your Chat app to a space, your Chat app responds to an ADDED_TO_SPACE interaction event. To respond to ADDED_TO_SPACE interaction events with a text message, use the following code:

/**
 * Sends an onboarding message when the Chat app is added to a space.
 *
 * @param {Object} req The event object from Chat API.
 * @param {Object} res The response object from the Chat app. An onboarding message that
 * introduces the app and helps people get started with it.
 */
exports.cymbalApp = function cymbalApp(req, res) {
  // Send an onboarding message when added to a Chat space
  if (req.body.type === 'ADDED_TO_SPACE') {
    res.json({
      'text': 'Hi, Cymbal at your service. I help you manage your calendar
      from Google Chat. Take a look at your schedule today by typing
      `/checkCalendar`, or schedule a meeting with `/scheduleMeeting`. To
      learn what else I can do, type `/help`.'
    });
  }
};

/**
 * Sends an onboarding message when the Chat app is added to a space.
 *
 * @param {Object} event The event object from Chat API.
 * @return {Object} Response from the Chat app. An onboarding message that
 * introduces the app and helps people get started with it.
 */
function onAddToSpace(event) {
  return {
    'text': 'Hi, Cymbal at your service. I help you manage your calendar
    from Google Chat. Take a look at your schedule today by typing
    `/checkCalendar`, or schedule a meeting with `/scheduleMeeting`. To learn
    what else I can do, type `/help`.'
  }
}

The code sample returns the following text message:

Sometimes Chat apps must respond to an interaction event after 30 seconds or perform tasks outside of the space where the interaction event was generated. For example, a Chat app might need to respond to the user after completing a long-running task. In this case, Chat apps can respond asynchronously by calling the Google Chat API.

To create a message using the Chat API, see Create a message. For guides on using additional Chat API methods, see the Chat API overview.

• Send a message
• Open interactive dialogs
• Preview links
• Read form data input by users on cards
• Respond to commands
• Build a homepage for a Chat app
• Verify requests from Chat
• Test interactive features for Google Chat apps

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