components/content-policy.js

   1 /**
   2  * (C) Copyright 2010 John J. Foerch
   3  *
   4  * Use, modification, and distribution are subject to the terms specified in the
   5  * COPYING file.
   6 **/
   7
   8 const Cc = Components.classes;
   9 const Ci = Components.interfaces;
  10 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
  11
  12 var content_policy_listener;
  13
  14 function content_policy () {
  15     this.conkeror = Cc["@conkeror.mozdev.org/application;1"]
  16         .getService()
  17         .wrappedJSObject;
  18     this.conkeror.define_hook("content_policy_hook", "RUN_HOOK_UNTIL_SUCCESS");
  19     this.conkeror.define_variable("content_policy_scheme_whitelist",
  20         { about: true, chrome: true, data: true, javascript: true, "moz-icon": true },
  21         "Requests whose scheme is in this structure (with a true value) "+
  22         "will be whitelisted before calling content_policy_hook.");
  23     this.conkeror.content_policy_listener = this;
  24 }
  25 content_policy.prototype = {
  26     QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentPolicy,
  27                                            Ci.nsIObserverService]),
  28     contractID: "@conkeror.org/content-policy-listener;1",
  29     classID: Components.ID("{2926dd11-4d76-4965-bcdc-4aaad70ada04}"),
  30     classDescription: "content_policy",
  31     _xpcom_factory: {
  32         createInstance: function (outer, iid) {
  33             if (outer)
  34                 throw Cr.NS_ERROR_NO_AGGREGATION;
  35             if (! content_policy_listener)
  36                 content_policy_listener = new content_policy();
  37             return content_policy_listener;
  38         }
  39     },
  40     _xpcom_categories: [{category: "content-policy"}],
  41
  42     enabled: false,
  43     shouldLoad: function (content_type,     //unsigned long
  44                           content_location, //nsIURI
  45                           request_origin,   //nsIURI
  46                           context,          //nsISupports
  47                           mime_type_guess,  //ACString
  48                           extra)            //nsISupports
  49     {
  50         if (this.enabled) {
  51             if (this.conkeror.content_policy_scheme_whitelist[content_location.scheme])
  52                 return Ci.nsIContentPolicy.ACCEPT;
  53             var action = this.conkeror.content_policy_hook.run(
  54                 content_type, content_location, request_origin,
  55                 context, mime_type_guess, extra);
  56         }
  57         return (action || Ci.nsIContentPolicy.ACCEPT);
  58     },
  59     shouldProcess: function (content_type,     //unsigned long
  60                              content_location, //nsIURI
  61                              request_origin,   //nsIURI
  62                              context,          //nsISupports
  63                              mime_type,        //ACString
  64                              extra)            //nsISupports
  65     {
  66         return Ci.nsIContentPolicy.ACCEPT;
  67     }
  68 };
  69
  70 if (XPCOMUtils.generateNSGetFactory)
  71     var NSGetFactory = XPCOMUtils.generateNSGetFactory([content_policy]); //XULRunner 2.0
  72 else
  73     var NSGetModule = XPCOMUtils.generateNSGetModule([content_policy]);