SlackBot-handleEventMessagev2.go

// handleEventMessage will take an event and handle it properly based on the type of event
func handleEventMessage(event slackevents.EventsAPIEvent, client *slack.Client) error {
	switch event.Type {
	// First we check if this is an CallbackEvent
	case slackevents.CallbackEvent:

		innerEvent := event.InnerEvent
		// Yet Another Type switch on the actual Data to see if its an AppMentionEvent
		switch ev := innerEvent.Data.(type) {
		case *slackevents.AppMentionEvent:
			// The application has been mentioned since this Event is a Mention event
			err := handleAppMentionEvent(ev, client)
			if err != nil {
				return err
			}
		}
	default:
		return errors.New("unsupported event type")
	}
	return nil
}