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Messenger_BOT/bot.js

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+const express = require("express");
+const bodyParser = require("body-parser");
+const request = require("request");
+const apiai = require("apiai");
+
+const app = express();
+
+// Environment variables
+const PAGE_ACCESS_TOKEN = process.env.PAGE_ACCESS_TOKEN || "your_page_token";
+const CLIENT_ACCESS_TOKEN =
+  process.env.CLIENT_ACCESS_TOKEN || "your_apiai_token";
+const VERIFY_TOKEN = process.env.VERIFY_TOKEN || "tuxedo_cat";
+
+// Initialize API.AI
+const apiaiApp = apiai(CLIENT_ACCESS_TOKEN);
+
+// Middleware
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+
+// Start server
+const server = app.listen(process.env.PORT || 5000, () => {
+  console.log(
+    "Express server listening on port %d in %s mode",
+    server.address().port,
+    app.settings.env,
+  );
+});
+
+// Facebook Webhook Verification
+app.get("/webhook", (req, res) => {
+  // Fixed: hub.mode (was hub.mdoe)
+  if (
+    req.query["hub.mode"] === "subscribe" &&
+    req.query["hub.verify_token"] === VERIFY_TOKEN
+  ) {
+    console.log("Validating webhook");
+    res.status(200).send(req.query["hub.challenge"]);
+  } else {
+    console.error("Failed validation. Make sure the validation tokens match.");
+    res.status(403).end();
+  }
+});
+
+// Handle all messages
+// Fixed: Added missing '/' in route
+app.post("/webhook", (req, res) => {
+  console.log("Webhook received:", req.body);
+
+  if (req.body.object === "page") {
+    req.body.entry.forEach((entry) => {
+      entry.messaging.forEach((event) => {
+        console.log("Event:", event);
+
+        // Process message events
+        if (event.message && event.message.text) {
+          sendMessage(event);
+        }
+      });
+    });
+  }
+
+  res.status(200).end();
+});
+
+// Send message function
+function sendMessage(event) {
+  let sender = event.sender.id;
+  let text = event.message.text;
+
+  // Send text to API.AI
+  let apiai = apiaiApp.textRequest(text, {
+    sessionId: "tabby_cat", // use any arbitrary id
+  });
+
+  apiai.on("response", (response) => {
+    // Got a response from api.ai
+    let aiText = response.result.fulfillment.speech;
+
+    // Send response back to Facebook Messenger
+    request(
+      {
+        // Fixed: facebook.com (was facebok.com)
+        url: "https://graph.facebook.com/v2.6/me/messages",
+        // Fixed: PAGE_ACCESS_TOKEN (was PAGE_ACCSESS_TOKEN)
+        qs: { access_token: PAGE_ACCESS_TOKEN },
+        method: "POST",
+        json: {
+          recipient: { id: sender },
+          message: { text: aiText }, // Fixed: use aiText not original text
+        },
+      },
+      function (error, response) {
+        if (error) {
+          console.log("Error sending message:", error);
+        } else if (response.body.error) {
+          console.log("Error:", response.body.error);
+        } else {
+          console.log("Message sent successfully!");
+        }
+      },
+    );
+  });
+
+  apiai.on("error", (error) => {
+    console.log("API.AI Error:", error);
+  });
+
+  apiai.end();
+}