Membangun aplikasi Google Chat di belakang firewall dengan Pub/Sub

Node.js

• Akun Google Workspace Business atau Enterprise dengan akses ke Google Chat.
• Project Google Cloud yang mengaktifkan penagihan. Untuk memeriksa apakah penagihan diaktifkan untuk project yang ada, 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 telah diinisialisasi. Untuk menginisialisasi project baru, buat dan alihkan ke folder baru, lalu jalankan perintah berikut di antarmuka command line Anda:

  npm init

Python

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

Java

• Akun Google Workspace Business atau Enterprise dengan akses ke Google Chat.
• Project Google Cloud yang mengaktifkan penagihan. Untuk memeriksa apakah penagihan diaktifkan untuk project yang ada, 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

Node.js

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan ID project 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 Anda, buat file bernama package.json.

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

   {
     "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 Anda, buat file bernama index.js.

7. Di index.js, tempelkan kode berikut:

   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 acknowledge 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);
       }
   
       // Acknowledge 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 chatEvent = event.chat || {};
   
     // If the app was removed, we don't respond.
     if (chatEvent.removedFromSpacePayload) {
       console.log(`App removed from space.`);
       return null;
     }
   
     const payload = chatEvent.messagePayload || chatEvent.addedToSpacePayload;
     const spaceName = payload?.space?.name;
   
     if (!spaceName) {
       console.log('No space name in event.');
       return null;
     }
   
     if (chatEvent.addedToSpacePayload) {
       // 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 (chatEvent.messagePayload) {
       // In case of message, post the response in the same thread.
       const message = chatEvent.messagePayload.message;
       return {
         parent: spaceName,
         messageReplyOption: MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD,
         message: {
           text: 'You said: `' + message.text + '`',
           thread: { name: 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();
   

Python

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan ID project 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 Anda, buat file bernama requirements.txt.

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

   google-cloud-pubsub>=2.23.0
   google-apps-chat==0.1.9
   

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

7. Di app.py, tempelkan kode berikut:

   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 acknowledge the received message
     def callback(message):
       event = json.loads(message.data)
       logging.info('Data : %s', event)
   
       # Post the response to Google Chat.
       request = format_request(event)
       if request is not None:
         chat.create_message(request)
   
       # Acknowledge 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.
     """
     chat_event = event.get('chat', {})
   
     # If the app was removed, we don't respond.
     if 'removedFromSpacePayload' in chat_event:
       logging.info('App removed from space.')
       return
   
     payload = chat_event.get('messagePayload') or chat_event.get(
         'addedToSpacePayload'
     )
     space_name = payload.get('space', {}).get('name') if payload else None
   
     if not space_name:
       logging.warning('No space name in event.')
       return
   
     if 'addedToSpacePayload' in chat_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 'messagePayload' in chat_event:
       # In case of message, post the response in the same thread.
       message = chat_event['messagePayload']['message']
       return google_chat.CreateMessageRequest(
           parent = space_name,
           message_reply_option = google_chat.CreateMessageRequest.MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD,
           message = {
             'text': 'You said: `' + message['text'] + '`',
             'thread': {
               'name': 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()
   

Java

1. Di CLI, berikan kredensial akun layanan:

   export GOOGLE_APPLICATION_CREDENTIALS=SERVICE_ACCOUNT_FILE_PATH
   

2. Di CLI, berikan ID project 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 Anda, buat file bernama pom.xml.

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

   <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.addon</groupId>
    <artifactId>pubsub-addon-chat-app</artifactId>
    <version>0.1.0</version>
   
    <name>pubsub-addon-chat-app-java</name>
   
    <properties>
      <maven.compiler.release>11</maven.compiler.release>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
   
    <dependencyManagement>
      <dependencies>
        <dependency>
          <groupId>com.google.cloud</groupId>
          <artifactId>libraries-bom</artifactId>
          <version>26.41.0</version> <!-- Use a recent BOM version -->
          <type>pom</type>
          <scope>import</scope>
        </dependency>
      </dependencies>
    </dependencyManagement>
   
    <dependencies>
      <!-- Google Chat GAPIC library -->
      <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>google-cloud-chat</artifactId>
      </dependency>
      <!-- Google Cloud Pub/Sub library -->
      <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>google-cloud-pubsub</artifactId>
      </dependency>
      <!-- Google Apps Add-ons Event Object -->
      <dependency>
        <groupId>com.google.apps.addons.v1</groupId>
        <artifactId>google-apps-addons-v1-java</artifactId>
        <version>0.2.0</version> <!-- Check for latest version -->
      </dependency>
      <!-- Protobuf JSON utility -->
      <dependency>
        <groupId>com.google.protobuf</groupId>
        <artifactId>protobuf-java-util</artifactId>
      </dependency>
      <!-- Google Auth Library -->
      <dependency>
        <groupId>com.google.auth</groupId>
        <artifactId>google-auth-library-oauth2-http</artifactId>
      </dependency>
      <dependency>
        <groupId>com.google.api</groupId>
        <artifactId>gax</artifactId>
      </dependency>
      <!-- JSON utilities for PubSub message (if needed, though protobuf-java-util is primary for EventObject) -->
      <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.14.2</version>
      </dependency>
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-jdk14</artifactId>
        <version>1.7.36</version>
        <scope>runtime</scope>
      </dependency>
    </dependencies>
   
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.13.0</version>
          <configuration>
            <source>11</source>
            <target>11</target>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>exec-maven-plugin</artifactId>
          <version>3.3.0</version>
          <configuration>
            <mainClass>Main</mainClass>
          </configuration>
        </plugin>
      </plugins>
    </build>
   </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:

   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 echoes 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, 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 acknowledge 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);
         // Negative acknowledgement makes Pub/Sub redeliver the message.
         consumer.nack();
       }
     }
   
     // Send message to Google Chat based on the type of event.
     public void handle(JsonNode eventJson) throws Exception {
       // Google Chat events for add-ons are wrapped in a 'chat' object.
       if (!eventJson.has("chat")) {
         System.out.println("Ignored: Not a Chat event (missing 'chat' field).");
         return;
       }
   
       JsonNode chatNode = eventJson.get("chat");
       CreateMessageRequest createMessageRequest = null;
   
       if (chatNode.has("messagePayload")) {
         // HANDLE MESSAGE
         JsonNode messagePayload = chatNode.get("messagePayload");
         JsonNode message = messagePayload.get("message");
         JsonNode space = messagePayload.get("space");
   
         String spaceName = space.get("name").asText();
         String userText = message.has("text") ? message.get("text").asText() : "";
         String threadName = message.has("thread") ? message.get("thread").get("name").asText() : "";
   
         System.out.println("Received message in " + spaceName + ": " + userText);
   
         createMessageRequest =
             CreateMessageRequest.newBuilder()
                 .setParent(spaceName)
                 .setMessageReplyOption(MessageReplyOption.REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD)
                 .setMessage(
                     Message.newBuilder()
                         .setText("You said: `" + userText + "`")
                         .setThread(Thread.newBuilder().setName(threadName).build())
                         .build())
                 .build();
   
       } else if (chatNode.has("addedToSpacePayload")) {
         // HANDLE ADDED TO SPACE
         JsonNode addedPayload = chatNode.get("addedToSpacePayload");
         JsonNode space = addedPayload.get("space");
         String spaceName = space.get("name").asText();
   
         System.out.println("Added to space: " + spaceName);
   
         createMessageRequest =
             CreateMessageRequest.newBuilder()
                 .setParent(spaceName)
                 .setMessage(Message.newBuilder().setText(ADDED_RESPONSE).build())
                 .build();
   
       } else if (chatNode.has("removedFromSpacePayload")) {
         System.out.println("Removed from space.");
         return;
       } else {
         System.out.println("Ignored: Unhandled Chat event type.");
         return;
       }
   
       if (createMessageRequest != null) {
         // Post the response to Google Chat.
         chatServiceClient.createMessage(createMessageRequest);
         System.out.println("Sent reply.");
       }
     }
   }
   

Node.js

npm install
npm start

Python

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

Java

mvn compile exec:java -Dexec.mainClass=Main