Add send message to group

app.js

@@ -14,7 +14,9 @@ const server = http.createServer(app);
 const io = socketIO(server);
 
 app.use(express.json());
-app.use(express.urlencoded({ extended: true }));
+app.use(express.urlencoded({
+  extended: true
+}));
 app.use(fileUpload({
   debug: true
 }));
@@ -26,7 +28,9 @@ if (fs.existsSync(SESSION_FILE_PATH)) {
 }
 
 app.get('/', (req, res) => {
-    res.sendFile('index.html', { root: __dirname });
+  res.sendFile('index.html', {
+    root: __dirname
+  });
 });
 
 const client = new Client({
@@ -51,6 +55,21 @@ client.on('message', msg => {
     msg.reply('pong');
   } else if (msg.body == 'good morning') {
     msg.reply('selamat pagi');
+  } else if (msg.body == '!groups') {
+    client.getChats().then(chats => {
+      const groups = chats.filter(chat => chat.isGroup);
+
+      if (groups.length == 0) {
+        msg.reply('You have no group yet.');
+      } else {
+        let replyMsg = '*YOUR GROUPS*\n\n';
+        groups.forEach((group, i) => {
+          replyMsg += `ID: ${group.id._serialized}\nName: ${group.name}\n\n`;
+        });
+        replyMsg += '_You can use the group id to send a message to the group._'
+        msg.reply(replyMsg);
+      }
+    });
   }
 });
 
@@ -77,8 +96,8 @@ io.on('connection', function(socket) {
     socket.emit('authenticated', 'Whatsapp is authenticated!');
     socket.emit('message', 'Whatsapp is authenticated!');
     console.log('AUTHENTICATED', session);
-        sessionCfg=session;
-        fs.writeFile(SESSION_FILE_PATH, JSON.stringify(session), function (err) {
+    sessionCfg = session;
+    fs.writeFile(SESSION_FILE_PATH, JSON.stringify(session), function(err) {
       if (err) {
         console.error(err);
       }
@@ -107,7 +126,9 @@ app.post('/send-message', [
   body('number').notEmpty(),
   body('message').notEmpty(),
 ], async (req, res) => {
-    const errors = validationResult(req).formatWith(({ msg }) => {
+  const errors = validationResult(req).formatWith(({
+    msg
+  }) => {
     return msg;
   });
 
@@ -153,14 +174,54 @@ app.post('/send-media', async (req, res) => {
   // const file = req.files.file;
   // const media = new MessageMedia(file.mimetype, file.data.toString('base64'), file.name);
   let mimetype;
-    const attachment = await axios.get(fileUrl, { responseType: 'arraybuffer' }).then(response => {
+  const attachment = await axios.get(fileUrl, {
+    responseType: 'arraybuffer'
+  }).then(response => {
     mimetype = response.headers['content-type'];
     return response.data.toString('base64');
   });
 
   const media = new MessageMedia(mimetype, attachment, 'Media');
 
-    client.sendMessage(number, media, { caption: caption }).then(response => {
+  client.sendMessage(number, media, {
+    caption: caption
+  }).then(response => {
+    res.status(200).json({
+      status: true,
+      response: response
+    });
+  }).catch(err => {
+    res.status(500).json({
+      status: false,
+      response: err
+    });
+  });
+});
+
+// Send message to group
+// -- Send message !groups to get all groups (id & name)
+// -- So you can use that group id to send a message
+app.post('/send-group-message', [
+  body('id').notEmpty(),
+  body('message').notEmpty(),
+], async (req, res) => {
+  const errors = validationResult(req).formatWith(({
+    msg
+  }) => {
+    return msg;
+  });
+
+  if (!errors.isEmpty()) {
+    return res.status(422).json({
+      status: false,
+      message: errors.mapped()
+    });
+  }
+
+  const chatId = req.body.id;
+  const message = req.body.message;
+
+  client.sendMessage(chatId, message).then(response => {
     res.status(200).json({
       status: true,
       response: response