Membangun aplikasi Google Chat di belakang firewall dengan Pub/Sub

Java

• Akun Google Workspace Business atau Enterprise dengan akses ke Google Chat.
• Project Google Cloud yang mengaktifkan penagihan. Untuk memeriksa apakah project yang ada telah mengaktifkan penagihan, lihat Memverifikasi status penagihan project Anda. Untuk membuat project dan menyiapkan penagihan, lihat Membuat project Google Cloud.
• Java 11 atau yang lebih baru
• Alat pengelolaan paket Maven

Python

• Akun Google Workspace Business atau Enterprise dengan akses ke Google Chat.
• Project Google Cloud yang mengaktifkan penagihan. Untuk memeriksa apakah project yang ada telah mengaktifkan penagihan, lihat Memverifikasi status penagihan project Anda. Untuk membuat project dan menyiapkan penagihan, lihat Membuat project Google Cloud.
• Python 3.6 atau yang lebih tinggi
• Alat pengelolaan paket pip

Node.js

• Akun Google Workspace Business atau Enterprise dengan akses ke Google Chat.
• Project Google Cloud yang mengaktifkan penagihan. Untuk memeriksa apakah project yang ada telah mengaktifkan penagihan, lihat Memverifikasi status penagihan project Anda. Untuk membuat project dan menyiapkan penagihan, lihat Membuat project Google Cloud.
• Node.js 14 atau yang lebih baru
• Alat pengelolaan paket npm
• Project Node.js yang diinisialisasi. Untuk menginisialisasi project baru, buat dan beralih ke folder baru, lalu jalankan perintah berikut di antarmuka command line:

  npm init

Java

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan project ID Google Cloud:

   export PROJECT_ID=PROJECT_ID
   

3. Di CLI, berikan ID langganan untuk langganan Pub/Sub yang Anda buat sebelumnya:

   export SUBSCRIPTION_ID=SUBSCRIPTION_ID
   

4. Di direktori kerja, buat file bernama pom.xml.

5. Di file pom.xml, tempel kode berikut:

   java/pub-sub-app/pom.xml

   Lihat di GitHub
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
   
     <groupId>com.google.chat</groupId>
     <artifactId>pub-sub-app</artifactId>
     <version>0.1.0</version>
   
     <name>pub-sub-app-java</name>
   
     <properties>
       <maven.compiler.release>21</maven.compiler.release>
       <maven.compiler.source>1.8</maven.compiler.source>
       <maven.compiler.target>1.8</maven.compiler.target>
     </properties>
   
     <dependencies>
       <!-- Google Chat GAPIC library -->
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-chat-v1</artifactId>
         <version>0.8.0</version>
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax</artifactId>
         <version>2.48.1</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-chat</artifactId>
         <version>0.1.0</version>
       </dependency>
       <!-- Google Cloud Pub/Sub library -->
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsub</artifactId>
       <version>1.125.8</version>
       </dependency>
       <!-- JSON utilities -->
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
         <version>2.14.2</version>
       </dependency>
     </dependencies>
   
   </project>

6. Di direktori kerja Anda, buat struktur direktori src/main/java.

7. Di direktori src/main/java, buat file bernama Main.java.

8. Di Main.java, tempelkan kode berikut:

   java/pub-sub-app/src/main/java/Main.java

   Lihat di GitHub
   import com.fasterxml.jackson.databind.JsonNode;
   import com.fasterxml.jackson.databind.ObjectMapper;
   import com.google.api.gax.core.FixedCredentialsProvider;
   import com.google.auth.oauth2.GoogleCredentials;
   import com.google.chat.v1.ChatServiceClient;
   import com.google.chat.v1.ChatServiceSettings;
   import com.google.chat.v1.CreateMessageRequest;
   import com.google.chat.v1.CreateMessageRequest.MessageReplyOption;
   import com.google.chat.v1.Message;
   import com.google.chat.v1.Thread;
   import com.google.cloud.pubsub.v1.AckReplyConsumer;
   import com.google.cloud.pubsub.v1.MessageReceiver;
   import com.google.cloud.pubsub.v1.Subscriber;
   import com.google.pubsub.v1.ProjectSubscriptionName;
   import com.google.pubsub.v1.PubsubMessage;
   import java.io.FileInputStream;
   import java.util.Collections;
   
   public class Main {
   
     public static final String PROJECT_ID_ENV_PROPERTY = "PROJECT_ID";
     public static final String SUBSCRIPTION_ID_ENV_PROPERTY = "SUBSCRIPTION_ID";
     public static final String CREDENTIALS_PATH_ENV_PROPERTY = "GOOGLE_APPLICATION_CREDENTIALS";
   
     public static void main(String[] args) throws Exception {
       ProjectSubscriptionName subscriptionName = ProjectSubscriptionName.of(
         System.getenv(Main.PROJECT_ID_ENV_PROPERTY),
         System.getenv(Main.SUBSCRIPTION_ID_ENV_PROPERTY));
   
       // Instantiate app, which implements an asynchronous message receiver.
       EchoApp echoApp = new EchoApp();
   
       // Create a subscriber for <var>SUBSCRIPTION_ID</var> bound to the message receiver
       final Subscriber subscriber = Subscriber.newBuilder(subscriptionName, echoApp).build();
       System.out.println("Subscriber is listening to events...");
       subscriber.startAsync();
   
       // Wait for termination
       subscriber.awaitTerminated();
     }
   }
   
   /**
    * A demo app which implements {@link MessageReceiver} to receive messages. It simply echoes the
    * incoming messages.
    */
   class EchoApp implements MessageReceiver {
   
     // Path to the private key JSON file of the service account to be used for posting response
     // messages to Google Chat.
     // In this demo, we are using the same service account for authorizing with Cloud Pub/Sub to
     // receive messages and authorizing with Google Chat to post messages. If you are using
     // different service accounts, please set the path to the private key JSON file of the service
     // account used to post messages to Google Chat here.
     private static final String SERVICE_ACCOUNT_KEY_PATH =
       System.getenv(Main.CREDENTIALS_PATH_ENV_PROPERTY);
   
     // Developer code for Google Chat API scope.
     private static final String GOOGLE_CHAT_API_SCOPE = "https://www.googleapis.com/auth/chat.bot";
   
     private static final String ADDED_RESPONSE = "Thank you for adding me!";
   
     ChatServiceClient chatServiceClient;
   
     EchoApp() throws Exception {
       GoogleCredentials credential = GoogleCredentials
         .fromStream(new FileInputStream(SERVICE_ACCOUNT_KEY_PATH))
         .createScoped(Collections.singleton(GOOGLE_CHAT_API_SCOPE));
   
       // Create the ChatServiceSettings with the app credentials
       ChatServiceSettings chatServiceSettings = ChatServiceSettings.newBuilder()
         .setCredentialsProvider(FixedCredentialsProvider.create(credential)).build();
   
       // Set the Chat service client
       chatServiceClient = ChatServiceClient.create(chatServiceSettings);
     }
   
     // Called when a message is received by the subscriber.
     @Override
     public void receiveMessage(PubsubMessage pubsubMessage, AckReplyConsumer consumer) {
       System.out.println("Id : " + pubsubMessage.getMessageId());
       // Handle incoming message, then ack/nack the received message
       try {
         ObjectMapper mapper = new ObjectMapper();
         JsonNode dataJson = mapper.readTree(pubsubMessage.getData().toStringUtf8());
         System.out.println("Data : " + dataJson.toString());
         handle(dataJson);
         consumer.ack();
       } catch (Exception e) {
         System.out.println(e);
         consumer.nack();
       }
     }
   
     // Send message to Google Chat based on the type of event.
     public void handle(JsonNode eventJson) throws Exception {
       CreateMessageRequest createMessageRequest;
       switch (eventJson.get("type").asText()) {
         case "ADDED_TO_SPACE":
           // An app can also be added to a space by @mentioning it in a message. In that case, we fall
           // through to the MESSAGE case and let the app respond. If the app was added using the
           // invite flow, we just post a thank you message in the space.
           if (!eventJson.has("message")) {
             createMessageRequest = CreateMessageRequest.newBuilder()
               .setParent(eventJson.get("space").get("name").asText())
               .setMessage(Message.newBuilder().setText(ADDED_RESPONSE).build()).build();
             break;
           }
         case "MESSAGE":
           // In case of message, post the response in the same thread.
           createMessageRequest = CreateMessageRequest.newBuilder()
             .setParent(eventJson.get("space").get("name").asText())
             .setMessageReplyOption(MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD)
             .setMessage(Message.newBuilder()
               .setText("You said: `" + eventJson.get("message").get("text").asText() + "`")
               .setThread(Thread.newBuilder()
                 .setName(eventJson.get("message").get("thread").get("name").asText())
                 .build()).build()).build();
           break;
         case "REMOVED_FROM_SPACE":
         default:
           // Do nothing
           return;
       }
   
       // Post the response to Google Chat.
       chatServiceClient.createMessage(createMessageRequest);
     }
   }

Python

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan project ID Google Cloud:

   export PROJECT_ID=PROJECT_ID
   

3. Di CLI, berikan ID langganan untuk langganan Pub/Sub yang Anda buat sebelumnya:

   export SUBSCRIPTION_ID=SUBSCRIPTION_ID
   

4. Di direktori kerja, buat file bernama requirements.txt.

5. Di file requirements.txt, tempel kode berikut:

   python/pub-sub-app/requirements.txt

   Lihat di GitHub
   google-cloud-pubsub>=2.23.0
   google-apps-chat==0.1.9

6. Di direktori kerja, buat file bernama app.py.

7. Di app.py, tempelkan kode berikut:

   python/pub-sub-app/app.py

   Lihat di GitHub
   import json
   import logging
   import os
   import sys
   import time
   from google.apps import chat_v1 as google_chat
   from google.cloud import pubsub_v1
   from google.oauth2.service_account import Credentials
   
   
   def receive_messages():
     """Receives messages from a pull subscription."""
   
     scopes = ['https://www.googleapis.com/auth/chat.bot']
     service_account_key_path = os.environ.get(
       'GOOGLE_APPLICATION_CREDENTIALS')
     creds = Credentials.from_service_account_file(
       service_account_key_path)
     chat = google_chat.ChatServiceClient(
       credentials = creds,
       client_options = {
         "scopes": scopes
       })
   
     project_id = os.environ.get('PROJECT_ID')
     subscription_id = os.environ.get('SUBSCRIPTION_ID')
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project_id, subscription_id)
   
     # Handle incoming message, then ack/nack the received message
     def callback(message):
       event = json.loads(message.data)
       logging.info('Data : %s', event)
       space_name = event['space']['name']
   
       # Post the response to Google Chat.
       request = format_request(event)
       if request is not None:
         chat.create_message(request)
   
       # Ack the message.
       message.ack()
   
     subscriber.subscribe(subscription_path, callback = callback)
     logging.info('Listening for messages on %s', subscription_path)
   
     # Keep main thread from exiting while waiting for messages
     while True:
       time.sleep(60)
   
   
   def format_request(event):
     """Send message to Google Chat based on the type of event.
     Args:
       event: A dictionary with the event data.
     """
     space_name = event['space']['name']
     event_type = event['type']
   
     # If the app was removed, we don't respond.
     if event['type'] == 'REMOVED_FROM_SPACE':
       logging.info('App removed rom space %s', space_name)
       return
     elif event_type == 'ADDED_TO_SPACE' and 'message' not in event:
       # An app can also be added to a space by @mentioning it in a
       # message. In that case, we fall through to the message case
       # and let the app respond. If the app was added using the
       # invite flow, we just post a thank you message in the space.
       return google_chat.CreateMessageRequest(
           parent = space_name,
           message = {
             'text': 'Thank you for adding me!'
           }
       )
     elif event_type in ['ADDED_TO_SPACE', 'MESSAGE']:
       # In case of message, post the response in the same thread.
       return google_chat.CreateMessageRequest(
           parent = space_name,
           message_reply_option = google_chat.CreateMessageRequest.MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD,
           message = {
             'text': 'You said: `' + event['message']['text'] + '`',
             'thread': {
               'name': event['message']['thread']['name']
             }
           }
       )
   
   
   if __name__ == '__main__':
     if 'PROJECT_ID' not in os.environ:
       logging.error('Missing PROJECT_ID env var.')
       sys.exit(1)
   
     if 'SUBSCRIPTION_ID' not in os.environ:
       logging.error('Missing SUBSCRIPTION_ID env var.')
       sys.exit(1)
   
     if 'GOOGLE_APPLICATION_CREDENTIALS' not in os.environ:
       logging.error('Missing GOOGLE_APPLICATION_CREDENTIALS env var.')
       sys.exit(1)
   
     logging.basicConfig(
         level=logging.INFO,
         style='{',
         format='{levelname:.1}{asctime} {filename}:{lineno}] {message}')
     receive_messages()

Node.js

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan project ID Google Cloud:

   export PROJECT_ID=PROJECT_ID
   

3. Di CLI, berikan ID langganan untuk langganan Pub/Sub yang Anda buat sebelumnya:

   export SUBSCRIPTION_ID=SUBSCRIPTION_ID
   

4. Di direktori kerja, buat file bernama package.json.

5. Di file package.json, tempel kode berikut:

   node/pub-sub-app/package.json

   Lihat di GitHub
   {
     "name": "pub-sub-app",
     "version": "1.0.0",
     "description": "Google Chat App that listens for messages via Cloud Pub/Sub",
     "main": "index.js",
     "scripts": {
       "start": "node index.js",
       "test": "echo \"Error: no test specified\" && exit 1"
     },
     "dependencies": {
       "@google-apps/chat": "^0.4.0",
       "@google-cloud/pubsub": "^4.5.0"
     },
     "license": "Apache-2.0"
   }

6. Di direktori kerja, buat file bernama index.js.

7. Di index.js, tempelkan kode berikut:

   node/pub-sub-app/index.js

   Lihat di GitHub
   const {ChatServiceClient} = require('@google-apps/chat');
   const {MessageReplyOption} = require('@google-apps/chat').protos.google.chat.v1.CreateMessageRequest;
   const {PubSub} = require('@google-cloud/pubsub');
   const {SubscriberClient} = require('@google-cloud/pubsub/build/src/v1');
   
   // Receives messages from a pull subscription.
   function receiveMessages() {
     const chat = new ChatServiceClient({
       keyFile: process.env.GOOGLE_APPLICATION_CREDENTIALS,
       scopes: ['https://www.googleapis.com/auth/chat.bot'],
     });
   
     const subscriptionPath = new SubscriberClient()
       .subscriptionPath(process.env.PROJECT_ID, process.env.SUBSCRIPTION_ID)
     const subscription = new PubSub()
       .subscription(subscriptionPath);
   
     // Handle incoming message, then ack/nack the received message
     const messageHandler = message => {
       console.log(`Id : ${message.id}`);
       const event = JSON.parse(message.data);
       console.log(`Data : ${JSON.stringify(event)}`);
   
       // Post the response to Google Chat.
       const request = formatRequest(event);
       if (request != null) {
         chat.createMessage(request);
       }
   
       // Ack the message.
       message.ack();
     }
   
     subscription.on('message', messageHandler);
     console.log(`Listening for messages on ${subscriptionPath}`);
   
     // Keep main thread from exiting while waiting for messages
     setTimeout(() => {
       subscription.removeListener('message', messageHandler);
       console.log(`Stopped listening for messages.`);
     }, 60 * 1000);
   }
   
   // Send message to Google Chat based on the type of event
   function formatRequest(event) {
     const spaceName = event.space.name;
     const eventType = event.type;
   
     // If the app was removed, we don't respond.
     if (event.type == 'REMOVED_FROM_SPACE') {
       console.log(`App removed rom space ${spaceName}`);
       return null;
     } else if (eventType == 'ADDED_TO_SPACE' && !eventType.message) {
       // An app can also be added to a space by @mentioning it in a
       // message. In that case, we fall through to the message case
       // and let the app respond. If the app was added using the
       // invite flow, we just post a thank you message in the space.
       return {
         parent: spaceName,
         message: { text: 'Thank you for adding me!' }
       };
     } else if (eventType == 'ADDED_TO_SPACE' || eventType == 'MESSAGE') {
       // In case of message, post the response in the same thread.
       return {
         parent: spaceName,
         messageReplyOption: MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD,
         message: {
           text: 'You said: `' + event.message.text + '`',
           thread: { name: event.message.thread.name }
         }
       };
     }
   }
   
   if (!process.env.PROJECT_ID) {
     console.log('Missing PROJECT_ID env var.');
     process.exit(1);
   }
   if (!process.env.SUBSCRIPTION_ID) {
     console.log('Missing SUBSCRIPTION_ID env var.');
     process.exit(1);
   }
   if (!process.env.GOOGLE_APPLICATION_CREDENTIALS) {
     console.log('Missing GOOGLE_APPLICATION_CREDENTIALS env var.');
     process.exit(1);
   }
   
   receiveMessages();

Java

mvn compile exec:java -Dexec.mainClass=Main

Python

python -m venv env
source env/bin/activate
pip install -r requirements.txt -U
python app.py

Node.js

npm install
npm start