Update homepage greeting

index.js

@@ -1,36 +1,78 @@
-const express = require('express')
-const path = require('path')
+const express = require('express');
+const path = require('path');
 
-const port = process.env.PORT || 5006
+const app = express();
+const port = process.env.PORT || 5006;
 
-const app = express()
+// Middleware
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
 
-app.use(express.static(path.join(__dirname, 'public')))
-app.set('views', path.join(__dirname, 'views'))
-app.set('view engine', 'ejs')
+// Static & views
+app.use(express.static(path.join(__dirname, 'public')));
+app.set('views', path.join(__dirname, 'views'));
+app.set('view engine', 'ejs');
 
+// Home route
 app.get('/', (req, res) => {
-  console.log(`Rendering 'pages/index' for route '/'`)
-  res.render('pages/index')
-})
+  res.send('WhatsApp Webhook is running ✅');
+});
 
-const server = app.listen(port, () => {
-  console.log(`Listening on ${port}`)
-})
-
-// The number of seconds an idle Keep-Alive connection is kept open. This should be greater than the Heroku Router's
-// Keep-Alive idle timeout of 90 seconds:
-// - to ensure that the closing of idle connections is always initiated by the router and not the Node.js server
-// - to prevent a race condition if the router sends a request to the app just as Node.js is closing the connection
-// https://devcenter.heroku.com/articles/http-routing#keepalives
-// https://nodejs.org/api/http.html#serverkeepalivetimeout
-server.keepAliveTimeout = 95 * 1000
-
-process.on('SIGTERM', async () => {
-  console.log('SIGTERM signal received: gracefully shutting down')
-  if (server) {
-    server.close(() => {
-      console.log('HTTP server closed')
-    })
+// 🔐 Webhook verification (Meta Step)
+app.get('/webhook', (req, res) => {
+  const VERIFY_TOKEN = 'my_verify_token'; // must match Meta token
+
+  const mode = req.query['hub.mode'];
+  const token = req.query['hub.verify_token'];
+  const challenge = req.query['hub.challenge'];
+
+  if (mode === 'subscribe' && token === VERIFY_TOKEN) {
+    console.log('Webhook verified');
+    res.status(200).send(challenge);
+  } else {
+    res.sendStatus(403);
   }
-})
+});
+
+// 📩 Receive WhatsApp messages
+app.post('/webhook', async (req, res) => {
+  console.log('Incoming webhook:', JSON.stringify(req.body, null, 2));
+
+  const entry = req.body.entry?.[0];
+  const changes = entry?.changes?.[0];
+  const value = changes?.value;
+  const messages = value?.messages;
+
+  if (messages && messages.length > 0) {
+    const from = messages[0].from;
+    const text = messages[0].text?.body;
+
+    console.log(`Message from ${from}: ${text}`);
+
+    // Auto-reply
+    await fetch(
+      `https://graph.facebook.com/v19.0/${process.env.PHONE_NUMBER_ID}/messages`,
+      {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': `Bearer ${process.env.WHATSAPP_TOKEN}`
+        },
+        body: JSON.stringify({
+          messaging_product: 'whatsapp',
+          to: from,
+          text: { body: '👋 Hello! Your message has been received successfully.' }
+        })
+      }
+    );
+  }
+
+  res.sendStatus(200);
+});
+
+// Start server
+const server = app.listen(port, () => {
+  console.log(`Server running on port ${port}`);
+});
+
+server.keepAliveTimeout = 95 * 1000;

views/pages/index.ejs

@@ -13,7 +13,7 @@
     <a href="/" class="lang-logo">
       <img src="/lang-logo.png">
     </a>
-    <h1>Getting Started on Heroku with Node.js</h1>
+    <h1>Hello from Balaraju 🚀</h1>
     <p>This is a sample Node application deployed to Heroku. It's a reasonably simple app - but a good foundation for understanding how to get the most out of the Heroku platform.</p>
     <a type="button" class="btn btn-lg btn-default" href="https://devcenter.heroku.com/articles/getting-started-with-nodejs"><span class="glyphicon glyphicon-flash"></span> Getting Started on Heroku with Node.js</a>
     <a type="button" class="btn btn-lg btn-default" href="https://devcenter.heroku.com/articles/getting-started-with-nodejs-fir"><span class="glyphicon glyphicon-flash"></span> Getting Started on Heroku Fir with Node.js</a>