xss vulnerability in outfits#show

This one was actually pretty darn clever - nobody's abused it, but
I was reading a blog post where someone described this type of
issue, I realized it was a brilliant attack, and then realized
DTI was vulnerable. Oops. Thanks for the solution, Jamie!

http://jamie-wong.com/2012/08/22/what-i-did-at-khan-academy/#XSS+Fix

app/helpers/application_helper.rb

@@ -130,6 +130,10 @@ module ApplicationHelper
     hidden_field_tag :return_to, request.fullpath
   end
   
+  def safely_to_json(obj)
+    obj.to_json.gsub('/', '\/')
+  end
+
   def secondary_nav(&block)
     content_for :before_flashes,
       content_tag(:nav, :id => 'secondary-nav', &block)

app/views/outfits/show.html.haml

@@ -21,7 +21,7 @@
 #outfit-items= render @outfit.worn_items
 - content_for :javascripts do
   :javascript
-    var INITIAL_OUTFIT_DATA = #{@outfit.to_json};
+    var INITIAL_OUTFIT_DATA = #{safely_to_json @outfit};
   = include_javascript_libraries :jquery, :swfobject
   = include_javascripts :show_outfit_package