phantomjs_login.js

var system = require('system');

// Control the script arguments
if (system.args.length < 2 || system.args.length > 2) {
  console.log("Invalid arguments");
  phantom.exit();
}
console.log("===== VIDEO URL: " + system.args[1])

var page = new WebPage(),
  fs = require("fs"),
  CookieJar = "cookiejar_pluralsight.json",
  testindex = 0,
  loadInProgress = false,
  loginUrl = "https://www.pluralsight.com/a/signin",
  outterInterval = null,
  mp4Urls = [],
  DEBUGFILE = "debug.txt",
  loggedIn = true,
  requestingUrl = null,
  historyUrl = "http://www.pluralsight.com/history";

// pretend to be a different browser, helps with some shitty browser-detection scripts
page.settings.userAgent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.107 Safari/537.36";

// Parse cookies, and let phantom save cookies
if (fs.isFile(CookieJar)) {
  Array.prototype.forEach.call(JSON.parse(fs.read(CookieJar)), function(x) {
    phantom.addCookie(x);
  });
}

// Config to write data to cookies when we load new pages
page.onResourceReceived = function(response) {
  fs.write(CookieJar, JSON.stringify(phantom.cookies), "w");
};

page.onLoadStarted = function() {
  loadInProgress = true;

  // Mark requestingUrl to check "redirect" behaviour while logging-in
  requestingUrl = page.evaluate(function() {
    return window.location.href;
  });
  console.log("load started");
};

page.onLoadFinished = function() {
  loadInProgress = false;
  console.log("load finished");
};

page.onUrlChanged = function(targetUrl) {
  // RULE: If from historyUrl, we got new URL => not logged in
  if (requestingUrl === historyUrl) {
    loggedIn = false;
  }
};

var steps = [
  function() {
    // This is needed to prevent script auto go to next step
    loadInProgress = true;
    page.open(historyUrl);
  },
  function() {
    if (!loggedIn) {
      // Load Login Page
      console.log("Not logged in yet. Gonna attemp to login now");
      page.open(loginUrl);
    } else {
      console.log(">> Cookies is still valid. Logged In!");
    }
  },
  function() {
    if (!loggedIn) {
      // This is needed to prevent script auto go to next step
      loadInProgress = true;

      window.setTimeout(function() {
        // Enter Credentials
        page.evaluate(function() {

          var loginForm = $("form.reg")[0] || $("form")[0];

          loginForm.elements["Username"].value = "[TYPE-USERNAME-HERE]";
          loginForm.elements["Password"].value = "[TYPE-PASSWORD-HERE]";
          // document.createElement('form').submit.call(document.getElementById('login-form'));
          HTMLFormElement.prototype.submit.call(document.querySelectorAll("form")[0])
        });
      }, 1500);
    }
  },
  function() {
    loadInProgress = true;
    window.setTimeout(function() {
      // Render screenshot of current page
      page.render("plural.png");
      loadInProgress = false;
    }, 1000);
  }
];

outterInterval = setInterval(function() {
  if (!loadInProgress && typeof steps[testindex] == "function") {
    console.log("step " + (testindex + 1));
    steps[testindex]();
    testindex++;
  } else if (!loadInProgress && typeof steps[testindex] != "function") {
    console.log("Done");
    phantom.exit();
  }
}, 50);

Note