index.js

'use strict';
const request = require('request');
const nodemailer = require('nodemailer');
const Globals = require('./globals');
const
    express = require('express'),
    bodyParser = require('body-parser'),
    app = express().use(bodyParser.json()); // creates express http server
const PAGE_ACCESS_TOKEN = Globals.PAGE_ACCESS_TOKEN;

let transporter = nodemailer.createTransport({
    host: Globals.HOST,
    port: Globals.PORT,
    secure: Globals.SECURE, // true for 465, false for other ports
    auth: {
        user: Globals.MAIL, // generated ethereal user
        pass: Globals.MAIL_PASS // generated ethereal password
    }
});

// Sets server port and logs message on success
app.listen(process.env.PORT || 1337, () => console.log('webhook is listening'));

// Creates the endpoint for our webhook
app.post('/webhook', (req, res) => {

  let body = req.body;

  // Checks this is an event from a page subscription
  if (body.object === 'page') {

    // Iterates over each entry - there may be multiple if batched
      body.entry.forEach(function(entry) {

          // Gets the body of the webhook event
          let webhook_event = entry.messaging[0];
          console.log(webhook_event);


          // Get the sender PSID
          let sender_psid = webhook_event.sender.id;
          console.log('Sender PSID: ' + sender_psid);

          // Check if the event is a message or postback and
          // pass the event to the appropriate handler function
          if (webhook_event.message) {
              handleMessage(sender_psid, webhook_event.message);
          } else if (webhook_event.postback) {
              handlePostback(sender_psid, webhook_event.postback);
          }

      });

    // Returns a '200 OK' response to all requests
    res.status(200).send('EVENT_RECEIVED');
  } else {
    // Returns a '404 Not Found' if event is not from a page subscription
    res.sendStatus(404);
  }

});

// Adds support for GET requests to our webhook
app.get('/webhook', (req, res) => {

  // Your verify token. Should be a random string.
  let VERIFY_TOKEN = Globals.VERIFY_TOKEN;

  // Parse the query params
  let mode = req.query['hub.mode'];
  let token = req.query['hub.verify_token'];
  let challenge = req.query['hub.challenge'];

  // Checks if a token and mode is in the query string of the request
  if (mode && token) {

    // Checks the mode and token sent is correct
    if (mode === 'subscribe' && token === VERIFY_TOKEN) {

      // Responds with the challenge token from the request
      console.log('WEBHOOK_VERIFIED');
      res.status(200).send(challenge);

    } else {
      // Responds with '403 Forbidden' if verify tokens do not match
      res.sendStatus(403);
    }
  }
});

var first = true;
var botStatus = true;
// Handles messages events
function handleMessage(sender_psid, received_message) {
    let response;

    request('https://graph.facebook.com/v2.6/'+sender_psid+'?fields=first_name,last_name&access_token='+PAGE_ACCESS_TOKEN, { json: true }, (err, res, body) => {
        if (err) { return console.log(err); }

        var name;
        if (body !== undefined){
            name = body["first_name"];
        }else{
            name = ""
        }

        if (received_message.text) {

            if (received_message.text.toLowerCase() === "bot start"){
                botStatus = true;
            }

            if (botStatus){
                switch (received_message.text.toLowerCase()) {
                    case "bot stop":
                        botStatus = false;
                        break;
                    case "ciao":
                    case "nein":
                    case "no":
                    case "ne":
                    case "tschüss":
                    case "auf wiedersehen":
                    case "bis dann":
                    case "man sieht sich":
                        first = true;
                        botStatus = true;
                        response = {
                            "text": "Auf Wiedersehen "+name+" :) Ich hoffe dir ein wenig geholfen zu haben. Ich melde mich bei dir!"
                        };
                        break;
                    case "merchandise":
                    case "merch":
                    case "fanartikel":
                        response = require("./messages/merch");
                        break;
                    case "gigs":
                    case "konzerte":
                    case "veranstaltungen":
                        response = require("./messages/gigs");
                        break;
                    case "veranstalter":
                        const Orga = require("./messages/organizers");
                        var organizers = new Orga(name);
                        response = organizers.response;
                        break;
                    default:
                        if (first){
                            response = {
                                "attachment": {
                                    "type": "template",
                                    "payload": {
                                        "template_type": "button",
                                        "text": 'Hi '+name+'\n\nSchön, dass du uns geschrieben hast. Wir melden uns so schnell wie möglich bei dir! Vielleicht kann ich dir auch jetzt schon helfen.\nBist du Veranstalter oder möchtest du uns einfach so schreiben?',
                                        "buttons": [
                                            {
                                                "type": "postback",
                                                "title": "Einfach so",
                                                "payload": "fan",
                                            },
                                            {
                                                "type": "postback",
                                                "title": "Veranstalter",
                                                "payload": "veranstalter",
                                            }
                                        ]
                                    }
                                }
                            };
                            first = false
                        }else{
                            response = {
                                "attachment": {
                                    "type": "template",
                                    "payload": {
                                        "template_type": "button",
                                        "text": "Kann ich dir sonst noch weiterhelfen?",
                                        "buttons": [
                                            {
                                                "type": "postback",
                                                "title": "Ja",
                                                "payload": "ja",
                                            },
                                            {
                                                "type": "postback",
                                                "title": "Nein",
                                                "payload": "nein",
                                            }
                                        ]
                                    }
                                }
                            }
                        }
                }
            }
        } else if (received_message.attachments) {
            response = {
                "text": "Vielen Dank für das Bild " + name
            }
        }

        // Send the response message
        callSendAPI(sender_psid, response);
    });
}

// Handles messaging_postbacks events
function handlePostback(sender_psid, received_postback) {
    let response;

    // Get the payload for the postback
    let payload = received_postback.payload;

    // Set the response based on the postback payload
    if (payload === 'ja') {
        response = { "text": "Okay, super! Du kannst nach 'gigs' oder nach 'merchandise' fragen. Falls du ein Veranstalter bist, so schreib doch bitte 'veranstalter', damit ich weitermachen kann."}
    } else if (payload === 'nein') {
        botStatus = true;
        first = true;
        response = { "text": "Okay! Dann sind wir hier fertig. Ich wünsch dir noch einen schönen Tag." }
    } else if (payload === 'fan') {
        response = require("./messages/postbacks/fan");
    } else if (payload === 'veranstalter') {
        response = require("./messages/postbacks/veranstalter");
    } else if (payload === "tshirt"){

        mail("T-Shirt", sender_psid);
        response = {
            "text": "Wir freuen uns über dein Interesse an unseren T-Shirts. Ich habe dein Interesse vermerkt und werde mich schnellstmöglich bei dir melden! Gruß Alex"
        }
    }else if (payload === "beutel"){

        mail("Kingpin Beutel", sender_psid);
        response = {
            "text": "Wir freuen uns über dein Interesse an unserem Beutel. Ich habe dein Interesse vermerkt und werde mich schnellstmöglich bei dir melden! Gruß Alex"
        }
    }else if (payload === "set"){

        mail("Kingpin Merch Set", sender_psid);
        response = {
            "text": "Wir freuen uns über dein Interesse an unserem Merchandise Set. Ich habe dein Interesse vermerkt und werde mich schnellstmöglich bei dir melden! Gruß Alex"
        }
    }else if (payload === "poster"){

        mail("Kingpin  Postser", sender_psid);
        response = {
            "text": "Wir freuen uns über dein Interesse an unseren Postern. Ich habe dein Interesse vermerkt und werde mich schnellstmöglich bei dir melden! Gruß Alex"
        }
    }

    // Send the message to acknowledge the postback
    callSendAPI(sender_psid, response);
}

// Sends response messages via the Send API
function callSendAPI(sender_psid, response) {
    // Construct the message body
    let request_body = {
        "recipient": {
            "id": sender_psid
        },
        "message": response
    }

    // Send the HTTP request to the Messenger Platform
    request({
        "uri": "https://graph.facebook.com/v2.6/me/messages",
        "qs": { "access_token": PAGE_ACCESS_TOKEN },
        "method": "POST",
        "json": request_body
    }, (err, res, body) => {
        if (!err) {
            console.log('message sent!')
        } else {
            console.error("Unable to send message:" + err);
        }
    });
}

function mail(artikel, sender_psid) {
    request('https://graph.facebook.com/v2.6/'+sender_psid+'?fields=first_name,last_name&access_token='+PAGE_ACCESS_TOKEN, { json: true }, (err, res, body) => {
        if (err) {
            return console.log(err);
        }

        var name;
        var nachname;
        if (body !== undefined) {
            name = body["first_name"];
            nachname = body["last_name"];

        } else {
            name = ""
            nachname = ""
        }

        // setup email data with unicode symbols
        let mailOptions = {
            from: "'Facebook Nutzer' <"+Globals.MAIL+">", // sender address
            to: Globals.MAIL_TO, // list of receivers
            subject: 'Merch Anfrage von ' + name + ' ' + nachname, // Subject line
            text: 'Hallo Kingpin,\n\nDer Facebook Nutzer '+ name + ' ' + nachname + ' ist an folgendem Merchandise Artikel interessiert:\n' + artikel, // plain text body
        };

        // send mail with defined transport object
        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                return console.log(error);
            }
            console.log('Message sent: %s', info.messageId);
            // Preview only available when sending through an Ethereal accountconsole.log('Preview URL: %s', nodemailer.getTestMessageUrl(info));

        });

    });
}