Веб-пуши для HTTP-сайтов в Chrome и Firefox

var pushwoosh = {
  PUSHWOOSH_APPLICATION_CODE: 'XXXX-XXXX',
  PUSHWOOSH_APPLICATION_CODE_GET_PARAMETER: 'pw_application_code',
  init: function (applicationCode) {
    this.PUSHWOOSH_APPLICATION_CODE = applicationCode;
    window.addEventListener('message', this.pwReceiveMessage, false);
  },
  tryInitUsingGetParameter: function () {
    var applicationCode = this.getQueryVariable(this.PUSHWOOSH_APPLICATION_CODE_GET_PARAMETER);
    console.log(applicationCode);
    if (applicationCode) {
      this.init(applicationCode);
    }
  },
  pwReceiveMessage: function (event) {
    if (event.data == 'allowPushNotifications') {
      localStorage.setItem('pwAllowPushNotifications', true);
    }
  },
  isBrowserChrome: function () {
    return navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
  },
  isBrowserFirefox: function () {
    return navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
  },
  isBrowserSafari: function () {
    return navigator.userAgent.toLowerCase().indexOf('safari') > -1 && !this.isBrowserChrome();
  },
  isBrowserSupported: function () {
    return this.isBrowserChrome() || this.isBrowserFirefox();
  },
  subscribeAtStart: function () {
    if (this.isBrowserSupported()) {
      if (null === localStorage.getItem('pwAllowPushNotifications')) {
        this.showSubscriptionWindow();
      }
    }
  },
  isSubscribedForPushNotifications: function () {
    return true == localStorage.getItem('pwAllowPushNotifications');
  },
  showSubscriptionWindow: function () {
    if (this.isBrowserSupported()) {
      var windowWidth = screen.width / 2;
      var windowHeight = screen.height / 2;

      var windowLeft = screen.width / 2 - windowWidth / 2;
      var windowRight = screen.height / 2 - windowHeight / 2;

      var URL = 'https://' + this.PUSHWOOSH_APPLICATION_CODE + '.chrome.pushwoosh.com/';
      var pwSubscribeWindow = window.open(URL, '_blank', 'width=' + windowWidth + ',height=' + windowHeight + ',resizable=yes,scrollbars=yes,status=yes,left=' + windowLeft + ',top=' + windowRight);
    }
  },
  getQueryVariable: function (variable) {
    // document.currentScript won't work if this code is called from function in event lister
    if (document.currentScript) {
      var urlParts = document.currentScript.src.split('?');
      if (typeof urlParts[1] !== 'undefined') {
        var vars = urlParts[1].split('&');
        for (var i = 0; i < vars.length; i++) {
          var pair = vars[i].split('=');
          if (pair[0] == variable) {
            return pair[1];
          }
        }
      }
    }
    else {
      console.error('Cannot get current script address');
    }
    return null;
  }
};
pushwoosh.tryInitUsingGetParameter();

<!--[if !IE]><!-->
    <script src="/pushwoosh-web-pushes-http-sdk.js?pw_application_code=XXXXX-XXXXX"></script>
<!--<
![endif]-->

<button onclick="pushwoosh.showSubscriptionWindow()
">Subscribe to push notifications</button>

<script>pushwoosh.subscribeAtStart();</script>