forman.js

const nodemailer = require('nodemailer');
const request = require('request');
const cp = require('child_process');

const rick = 'https://www.youtube.com/watch?v=dQw4w9WgXcQ';
const forman = 'http://www.cs.put.poznan.pl/pformanowicz/students.html';

function getLogString()
{
  var date = new Date();
  return '[' + date.getHours()+':'+date.getMinutes()+':'+date.getSeconds()+'] ';
}

var transporter = nodemailer.createTransport({
        host: 'smtp.gmail.com',
        port: 587,
        secure: false,
        auth: {
            user: 'username',
            pass: 'password'
        }
    });

    var mailOptions = {
        from: '"It\'s Piotr Formanowicz!" <michal.sw12@gmail.com>',
        to: 'address',
        subject: 'Wyniki egzaminu z matemayki dyskretnej',
        html: `<a href="${forman}">${forman}</a>`
    };

    function notify()
    {
      transporter.sendMail(mailOptions, (error, info) => {
          if (error) {
              return console.log(error);
          }
          console.log(getLogString()+`Mail sent to ${mailOptions.to}`);

      });
    }


    const options = {
    url: forman,
    method: 'HEAD'
    };

    console.log(getLogString() + "forman.js started");

    var lastModified;
    console.log(getLogString() + "Establishing connection...");
    request(options, (err, res, body)=>{
        if(err) {console.log(getLogString()+ 'Could not establish a connection, exiting...'); process.exit(1);};
        lastModified = res.headers['last-modified'];
        console.log(getLogString() +'Site last modified on ' + lastModified);
    });



    var id = setInterval(()=>{
          var tmp;
          request(options, (err, res, body)=>{
            if(err) return console.log(getLogString() + ' Connection lost, trying again...');
              tmp = res.headers['last-modified'];

              if(lastModified != tmp)
              {
                notify();
                cp.spawn('C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe', [rick, forman]);
                clearInterval(id);
                console.log(getLogString()+"Exiting...");
              }
          });

    }, 5000);