The Tor Browser: uriloader/exthandler/nsWebHandlerApp.js@97036ab72558 (annotated)

uriloader/exthandler/nsWebHandlerApp.js@97036ab72558 (annotated)

uriloader/exthandler/nsWebHandlerApp.js

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 ////////////////////////////////////////////////////////////////////////////////
 //// Constants
 const Ci = Components.interfaces;
 const Cr = Components.results;
 const Cc = Components.classes;
 ////////////////////////////////////////////////////////////////////////////////
 //// nsWebHandler class
 function nsWebHandlerApp() {}
 nsWebHandlerApp.prototype = {
   //////////////////////////////////////////////////////////////////////////////
   //// nsWebHandler
   classDescription: "A web handler for protocols and content",
   classID: Components.ID("8b1ae382-51a9-4972-b930-56977a57919d"),
   contractID: "@mozilla.org/uriloader/web-handler-app;1",
   _name: null,
   _detailedDescription: null,
   _uriTemplate: null,
   //////////////////////////////////////////////////////////////////////////////
   //// nsIHandlerApp
   get name() {
     return this._name;
   },
   set name(aName) {
     this._name = aName;
   },
   get detailedDescription() {
     return this._detailedDescription;
   },
   set detailedDescription(aDesc) {
     this._detailedDescription = aDesc;
   },
   equals: function(aHandlerApp) {
     if (!aHandlerApp)
       throw Cr.NS_ERROR_NULL_POINTER;
     if (aHandlerApp instanceof Ci.nsIWebHandlerApp &&
         aHandlerApp.uriTemplate &&
         this.uriTemplate &&
         aHandlerApp.uriTemplate == this.uriTemplate)
       return true;
     return false;
   },
   launchWithURI: function nWHA__launchWithURI(aURI, aWindowContext) {
     // XXX need to strip passwd & username from URI to handle, as per the
     // WhatWG HTML5 draft.  nsSimpleURL, which is what we're going to get,
     // can't do this directly.  Ideally, we'd fix nsStandardURL to make it
     // possible to turn off all of its quirks handling, and use that...
     // encode the URI to be handled
     var escapedUriSpecToHandle = encodeURIComponent(aURI.spec);
     // insert the encoded URI and create the object version
     var uriSpecToSend = this.uriTemplate.replace("%s", escapedUriSpecToHandle);
     var ioService = Cc["@mozilla.org/network/io-service;1"].
                     getService(Ci.nsIIOService);
     var uriToSend = ioService.newURI(uriSpecToSend, null, null);
     // if we have a window context, use the URI loader to load there
     if (aWindowContext) {
       // create a channel from this URI
       var channel = ioService.newChannelFromURI(uriToSend);
       channel.loadFlags = Ci.nsIChannel.LOAD_DOCUMENT_URI;
       // load the channel
       var uriLoader = Cc["@mozilla.org/uriloader;1"].
                       getService(Ci.nsIURILoader);
       // XXX ideally, whether to pass the IS_CONTENT_PREFERRED flag should be
       // passed in from above.  Practically, the flag is probably a reasonable
       // default since browsers don't care much, and link click is likely to be
       // the more interesting case for non-browser apps.  See
       // <https://bugzilla.mozilla.org/show_bug.cgi?id=392957#c9> for details.
       uriLoader.openURI(channel, Ci.nsIURILoader.IS_CONTENT_PREFERRED,
                         aWindowContext);
       return;
     }
     // since we don't have a window context, hand it off to a browser
     var windowMediator = Cc["@mozilla.org/appshell/window-mediator;1"].
       getService(Ci.nsIWindowMediator);
     // get browser dom window
     var browserDOMWin = windowMediator.getMostRecentWindow("navigator:browser")
                         .QueryInterface(Ci.nsIDOMChromeWindow)
                         .browserDOMWindow;
     // if we got an exception, there are several possible reasons why:
     // a) this gecko embedding doesn't provide an nsIBrowserDOMWindow
     //    implementation (i.e. doesn't support browser-style functionality),
     //    so we need to kick the URL out to the OS default browser.  This is
     //    the subject of bug 394479.
     // b) this embedding does provide an nsIBrowserDOMWindow impl, but
     //    there doesn't happen to be a browser window open at the moment; one
     //    should be opened.  It's not clear whether this situation will really
     //    ever occur in real life.  If it does, the only API that I can find
     //    that seems reasonably likely to work for most embedders is the
     //    command line handler.
     // c) something else went wrong
     //
     // it's not clear how one would differentiate between the three cases
     // above, so for now we don't catch the exception
     // openURI
     browserDOMWin.openURI(uriToSend,
                           null, // no window.opener
                           Ci.nsIBrowserDOMWindow.OPEN_DEFAULTWINDOW,
                           Ci.nsIBrowserDOMWindow.OPEN_NEW);
     return;
   },
   //////////////////////////////////////////////////////////////////////////////
   //// nsIWebHandlerApp
   get uriTemplate() {
     return this._uriTemplate;
   },
   set uriTemplate(aURITemplate) {
     this._uriTemplate = aURITemplate;
   },
   //////////////////////////////////////////////////////////////////////////////
   //// nsISupports
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebHandlerApp, Ci.nsIHandlerApp])
 };
 ////////////////////////////////////////////////////////////////////////////////
 //// Module
 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([nsWebHandlerApp]);