2.21.2011

jQuery-Encoder updated

I have made several updates to the jqencoder plugin over the weekend and thought I would share a little about them quickly.

Plugin Readme: http://bit.ly/ie4J04

First, and most importantly - I have added a series of static methods (that look similar to the methods on the Encoder interface for ESAPI) to perform particular contextual encoding tasks - specifically when building html dynamically rather than building elements up using the DOM.

  • encodeForHTML
  • encodeForHTMLAttribute
  • encodeForCSS
  • encodeForURL
  • encodeForJavascript

Each of these methods can be accessed under the static $.encoder context.

$.post('http://untrusted.com/external_profile', function(profile) {
      $('#widget').html('<div id="untrusted_widget" width="' + 
                        $.encoder.encodeForHTMLAttribute(profile.width) + 
                        '" onmouseover="' + profile.callback + "(\'' +
                        $.encoder.encodeForJavascript(profile.parm) + 
                        '\')">' + $.encoder.encodeForHTML(profile.data) + 
                        '</div>');
   }

In addition, the $.canonicalize method has also been moved into the $.encoder context.

$('#phonenumber').blur(function() {
      validatePhoneNumber($.encoder.canonicalize(this.val());
   });

The third, and final big change over the weekend - was solidifying the ES5 immutable objects protection. If it is supported by the browser, the $.encoder object will be frozen, sealed, or non-extensible (in that order of priority) to protect the encoding and canonicalize functions themselves from being tampered with at runtime. At this point in time, Chrome has implemented Object.freeze in the latest release version, Mozilla has implemented it in Firefox 4 and Microsoft have implemented it in IE9. Safari shows no indication of implementing it, and neither does Opera.

Now, I pose a question to the developers that may use this plugin. Is there a need to keep the instance method $.fn.encode? It seems to me that due to the nature of setting DOM element properties via Javascript, that this is not really needed at all. So, should I nuke it?

I end this post with a final thought (continuing from my above conversation of Object.freeze)

I strongly recommend that developers start taking the initiative to make their custom JS objects immutable, and also recommend making framework objects immutable as well. If you were to (using jQuery) issue the following in your onready handler

$(document).ready(function(){
   if ( Object.freeze ) $ = Object.freeze($);
   // .. initialize page below here
});

It seems to me, this could eliminate a lot of potential vulnerability exploitation of bugs in framework code. What are your thoughts?

Also, why not consider the following:

var lock_objs = [ String.prototype, 
                     Array.prototype, 
                     Function.prototype, 
                     Object.prototype ];
   for (var i=0;i<lock_objs.length;i++) lock_objs[i] = Object.freeze(lock_objs[i]);

8 comments:

  1. Once again great post. You seem to have a good understanding of these themes.When I entering your blog,I felt this . Come on and keep writting your blog will be more attractive. To Your Success!

    Classic Dresses
    Classic Bridesmaid Dresses
    Wedding Dresses with Sleeves

    ReplyDelete
  2. Once again great post. You seem to have a good understanding of these themes.When I entering your blog,I felt this . Come on and keep writting your blog will be more attractive. To Your Success!

    Classic Dresses
    Classic Bridesmaid Dresses
    Wedding Dresses with Sleeves
    Flower Girl Dresses
    Empire Wedding Dresses

    ReplyDelete
  3. Good article.I really think what you said is right,in modern society,we have so many troubles,if you feel nothing to relax yourself,I suggest you to play the wow and some other games,and you can come to my page to find more information about http//www.mmolive.com/ andhttp://www.mmohome.com/gold/Maple-Story-US.html

    ReplyDelete
  4. You can easily order your Guild Wars 2 Gold on our website. Guildwars2buygold guarantees quality and quickness. Just choose the desired amount of GW2 Gold, your server and send the order.After order paid, please contact our livechat to get your delivery.You will receive your Guild wars 2 Gold from here mostly within a few hours after order confirmed. Delivery of the cheap Guild Wars 2 Gold via trading face to face in game.

    ReplyDelete
  5. Hello guys, how was everything.I am new this website and want to share my experience and opinions with you. Do you think sometimes words cannot express the burden of our life. We need to find a proper way to unleash our stress which could be fatal. We live in a uncertain enviroment. We never know what will happen tomorrow. Natural disaters is always around us.So enjoy the current. As for me, farming WoW gold is the most instersting thing which can not only make money but also vex my pressure. You know, many other gamers want to buy WoW items from me. It's really amazing.

    ReplyDelete
  6. salam kenal bos. lagi jalan jalan pagi nih

    ReplyDelete