block prefetching links

git-svn-id: http://svn.barleysodas.com/barleysodas/trunk@42 0f7b21a7-9e3a-4941-bbeb-ce5c7c368fa7

app/controllers/application.rb

@@ -1,5 +1,6 @@
 class ApplicationController < ActionController::Base
   session :session_key => '_barleysodas_session_id'
+  append_before_filter :block_prefeching_links
   
   ##
   # Ensures that the request was made using an Ajax request.
@@ -27,4 +28,39 @@ class ApplicationController < ActionController::Base
           :status => '500 Error'
     end
   end
+  
+  private
+  
+  ##
+  # Stops all prefetching by the Google web accelerator by returning a 403
+  # forbidden error.
+  #
+  # Original Copyright:
+  # Copyright (c) 2005 David Heinemeier Hansson
+  #
+  # Permission is hereby granted, free of charge, to any person obtaining
+  # a copy of this software and associated documentation files (the
+  # "Software"), to deal in the Software without restriction, including
+  # without limitation the rights to use, copy, modify, merge, publish,
+  # distribute, sublicense, and/or sell copies of the Software, and to
+  # permit persons to whom the Software is furnished to do so, subject to
+  # the following conditions:
+  #
+  # The above copyright notice and this permission notice shall be
+  # included in all copies or substantial portions of the Software.
+  #
+  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  #
+  def block_prefetching_links
+    if request.env["HTTP_X_MOZ"] == "prefetch"
+      render :nothing => true, :status => "403 Forbidden"
+      return false
+    end
+  end
 end