sessionspike.js

(function (w) {
  var referrer,
  currentDomain,
  domainPattern = /^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:\/\n]+)/im;

  function isArrayWithLength(array) {
    if (Array.isArray(array) && array.length === 2) {
      return array[1];
    }
  }

  function uuid() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0,
        v = c == 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
    });
  }

  function main() {
    referrerMatch = document.referrer.match(domainPattern);
    currentMatch  = window.location.href.match(domainPattern);

    referrer = isArrayWithLength(referrerMatch);
    currentDomain = isArrayWithLength(currentMatch);

    if (referrer === undefined || !new RegExp(referrer).test(currentDomain)) {
      if (localStorage.getItem('olab-session-token')) {
        localStorage.removeItem('olab-session-token');
      }

      localStorage.setItem('olab-session-token', uuid());
      console.log('POST DATA');
    }

    if (referrer && new RegExp(referrer).test(currentDomain)) {
      if (localStorage.getItem('olab-session-token') === undefined) {
        localStorage.setItem('olab-session-token', uuid());
      }

      console.log('POST DATA');
    }
  }

  w.onload = main;
})(window);