instagram.js

var Nightmare = require('nightmare')
  , vo = require('vo')
  , fs = require('fs')
  , request = require('request')
  , account = require('./account.js')
  , username = account.username
  , password = account.password
  ;

vo(run)(function(err, result) {
  if (err) throw err;
});

function *run() {
  var x = Date.now();
  var nightmare = Nightmare({ show: true });
  var src = yield nightmare
  .useragent('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36')
  
  .goto('https://www.instagram.com/accounts/login/')
  .wait()
  
  .wait('.-cx-PRIVATE-SlimLoginForm__button')
  .evaluate(function(username, password){
    var event = new Event('input', { bubbles: true });
    $('[name=username]')[0].value = username;
    $('[name=username]')[0].dispatchEvent(event);
    $('[name=password]')[0].value = password;
    $('[name=password]')[0].dispatchEvent(event);
  }, username, password)
  .wait(600)
  .click('.-cx-PRIVATE-SlimLoginForm__button')
    .wait(600)

  .goto('https://instagram.com/marciegottschalk/')
    .wait()
  .click('.-cx-PRIVATE-Photo__clickShield') // clica na primeira foto
    .wait().wait(1000)
  .screenshot('before.png')
  
  .evaluate(function(){
    $('.-cx-PRIVATE-PostInfo__likeButton.coreSpriteHeartOpen')[0].click();
  })
  
  .wait(1000)
  .screenshot('after.png')
  
  .evaluate(function(){
    var liked = document.querySelectorAll('.-cx-PRIVATE-PostInfo__likeButton.coreSpriteHeartFull').length;
    if(liked === 0){
      return document.querySelector('.-cx-PRIVATE-Photo__image').src;
    }
  });

  console.log("done in " + (Date.now()-x) + "ms");
  if(src)
    downloadImage(src);
  yield nightmare.end();
}

function downloadImage(src){
  request({ url: src, encoding: 'binary'}, function(err, res, body){
    fs.writeFile('./foto.png', body, 'binary', function(err){
      if(!err) console.log('foto salva :)')
    });
  });
}