Add validation, formatter & some configs

app.js

@@ -1,9 +1,11 @@
 const { Client } = require('whatsapp-web.js');
 const express = require('express');
+const { body, validationResult } = require('express-validator');
 const socketIO = require('socket.io');
 const qrcode = require('qrcode');
 const http = require('http');
 const fs = require('fs');
+const { phoneNumberFormatter } = require('./helpers/formatter');
 
 const app = express();
 const server = http.createServer(app);
@@ -22,7 +24,22 @@ app.get('/', (req, res) => {
     res.sendFile('index.html', { root: __dirname });
 });
 
-const client = new Client({ puppeteer: { headless: true }, session: sessionCfg });
+const client = new Client({ 
+    puppeteer: { 
+        headless: true,
+        args: [
+          '--no-sandbox',
+          '--disable-setuid-sandbox',
+          '--disable-dev-shm-usage',
+          '--disable-accelerated-2d-canvas',
+          '--no-first-run',
+          '--no-zygote',
+          '--single-process', // <- this one doesn't works in Windows
+          '--disable-gpu'
+        ],
+    }, 
+    session: sessionCfg 
+});
 
 client.on('message', msg => {
     if (msg.body == '!ping') {
@@ -62,13 +79,52 @@ io.on('connection', function(socket) {
             }
         });
     });
+
+    client.on('auth_failure', function(session) {
+        socket.emit('message', 'Auth failure, restarting...');
+    });
+
+    client.on('disconnected', (reason) => {
+        socket.emit('message', 'Whatsapp is disconnected!');
+        client.destroy();
+        client.initialize();
+    });
 });
 
+
+const checkRegisteredNumber = async function(number) {
+    const isRegistered = await client.isRegisteredUser(number);
+    return isRegistered;
+}
+
 // Send message
-app.post('/send-message', (req, res) => {
-    const number = req.body.number;
+app.post('/send-message', [
+    body('number').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 number = phoneNumberFormatter(req.body.number);
     const message = req.body.message;
 
+    const isRegisteredNumber = await checkRegisteredNumber(number);
+
+    if (!isRegisteredNumber) {
+        return res.status(422).json({
+            status: false,
+            message: 'The number is not registered'
+        });
+    }
+
     client.sendMessage(number, message).then(response => {
         res.status(200).json({
             status: true,