Belajar Firebase Functions: Kirim Email dari Contact Form

index.js

var functions = require('firebase-functions');
var nodemailer = require('nodemailer');

// Setting email dan password pengirim
const gmailEmail = 'email.kamu@gmail.com';
const gmailPass  = 'password.email.kamu';

const mailer = nodemailer.createTransport({
  service: 'Gmail',
  auth: {user: gmailEmail, pass: gmailPass}
});

// Mendefinisikan fungsi dengan HTTP trigger
exports.sendEmail = functions.https.onRequest(function (req, res) {
  var text = [
    'Pengirim: '+req.body.email,
    'Subjek: '+req.body.subject,
    'Pesan: '+req.body.message
  ];

  var message = {
    from: req.body.email,
    to: gmailEmail,
    replyTo: req.body.email,
    subject: 'Pesan baru dari contact form: '+req.body.subject,
    text: text.join("\n")
  }

  return mailer.sendMail(message).then(function () {
    res.send('Email terkirim!');  
  });
});