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bot.js
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bot.js
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//
// This is main file containing code implementing the Express server and functionality for the Express echo bot.
//
'use strict';
const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const path = require('path');
var messengerButton = "<html><head><title>Facebook Messenger Bot</title></head><body><h1>Facebook Messenger Bot</h1>This is a bot based on Messenger Platform QuickStart. For more details, see their <a href=\"https://developers.facebook.com/docs/messenger-platform/guides/quick-start\">docs</a>.<script src=\"https://button.glitch.me/button.js\" data-style=\"glitch\"></script><div class=\"glitchButton\" style=\"position:fixed;top:20px;right:20px;\"></div></body></html>";
// The rest of the code implements the routes for our Express server.
let app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
// Webhook validation
app.get('/webhook', function(req, res) {
if (req.query['hub.mode'] === 'subscribe' &&
req.query['hub.verify_token'] === process.env.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.sendStatus(403);
}
});
// Display the web page
app.get('/', function(req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.write(messengerButton);
res.end();
});
// Message processing
app.post('/webhook', function (req, res) {
console.log(req.body);
var data = req.body;
// Make sure this is a page subscription
if (data.object === 'page') {
// Iterate over each entry - there may be multiple if batched
data.entry.forEach(function(entry) {
var pageID = entry.id;
var timeOfEvent = entry.time;
// Iterate over each messaging event
entry.messaging.forEach(function(event) {
if (event.message) {
receivedMessage(event);
} else if (event.postback) {
receivedPostback(event);
} else {
console.log("Webhook received unknown event: ", event);
}
});
});
// Assume all went well.
//
// You must send back a 200, within 20 seconds, to let us know
// you've successfully received the callback. Otherwise, the request
// will time out and we will keep trying to resend.
res.sendStatus(200);
}
});
// Incoming events handling
function receivedMessage(event) {
var senderID = event.sender.id;
var recipientID = event.recipient.id;
var timeOfMessage = event.timestamp;
var message = event.message;
console.log("Received message for user %d and page %d at %d with message:",
senderID, recipientID, timeOfMessage);
console.log(JSON.stringify(message));
var messageId = message.mid;
var messageText = message.text;
var messageAttachments = message.attachments;
if (messageText) {
// If we receive a text message, check to see if it matches a keyword
// and send back the template example. Otherwise, just echo the text we received.
switch (messageText) {
case 'generic':
sendGenericMessage(senderID);
break;
default:
sendTextMessage(senderID, messageText);
}
} else if (messageAttachments) {
sendTextMessage(senderID, "Message with attachment received");
}
}
function receivedPostback(event) {
var senderID = event.sender.id;
var recipientID = event.recipient.id;
var timeOfPostback = event.timestamp;
// The 'payload' param is a developer-defined field which is set in a postback
// button for Structured Messages.
var payload = event.postback.payload;
console.log("Received postback for user %d and page %d with payload '%s' " +
"at %d", senderID, recipientID, payload, timeOfPostback);
// When a postback is called, we'll send a message back to the sender to
// let them know it was successful
sendTextMessage(senderID, "Postback called");
}
//////////////////////////
// Sending helpers
//////////////////////////
function sendTextMessage(recipientId, messageText) {
var messageData = {
recipient: {
id: recipientId
},
message: {
text: messageText
}
};
callSendAPI(messageData);
}
function sendGenericMessage(recipientId) {
var messageData = {
recipient: {
id: recipientId
},
message: {
attachment: {
type: "template",
payload: {
template_type: "generic",
elements: [{
title: "rift",
subtitle: "Next-generation virtual reality",
item_url: "https://www.oculus.com/en-us/rift/",
image_url: "http://messengerdemo.parseapp.com/img/rift.png",
buttons: [{
type: "web_url",
url: "https://www.oculus.com/en-us/rift/",
title: "Open Web URL"
}, {
type: "postback",
title: "Call Postback",
payload: "Payload for first bubble",
}],
}, {
title: "touch",
subtitle: "Your Hands, Now in VR",
item_url: "https://www.oculus.com/en-us/touch/",
image_url: "http://messengerdemo.parseapp.com/img/touch.png",
buttons: [{
type: "web_url",
url: "https://www.oculus.com/en-us/touch/",
title: "Open Web URL"
}, {
type: "postback",
title: "Call Postback",
payload: "Payload for second bubble",
}]
}]
}
}
}
};
callSendAPI(messageData);
}
function callSendAPI(messageData) {
request({
uri: 'https://graph.facebook.com/v2.6/me/messages',
qs: { access_token: process.env.PAGE_ACCESS_TOKEN },
method: 'POST',
json: messageData
}, function (error, response, body) {
if (!error && response.statusCode == 200) {
var recipientId = body.recipient_id;
var messageId = body.message_id;
console.log("Successfully sent generic message with id %s to recipient %s",
messageId, recipientId);
} else {
console.error("Unable to send message.");
console.error(response);
console.error(error);
}
});
}
// Set Express to listen out for HTTP requests
var server = app.listen(process.env.PORT || 3000, function () {
console.log("Listening on port %s", server.address().port);
});