The Tor Browser: content/base/src/FeedWriterEnabled.h@97036ab72558

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.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "js/TypeDecls.h"

     7 #include "nsGlobalWindow.h"

     8 #include "nsIPrincipal.h"

     9 #include "nsIURI.h"

    10 #include "nsString.h"

    11 #include "xpcpublic.h"

    13 namespace mozilla {

    15 struct FeedWriterEnabled {

    16   static bool IsEnabled(JSContext* cx, JSObject* aGlobal)

    17   {

    18     // Make sure the global is a window

    19     nsGlobalWindow* win = xpc::WindowGlobalOrNull(aGlobal);

    20     if (!win) {

    21       return false;

    22     }

    24     // Make sure that the principal is about:feeds.

    25     nsCOMPtr<nsIPrincipal> principal = win->GetPrincipal();

    26     NS_ENSURE_TRUE(principal, false);

    27     nsCOMPtr<nsIURI> uri;

    28     principal->GetURI(getter_AddRefs(uri));

    29     if (!uri) {

    30       return false;

    31     }

    33     // First check the scheme to avoid getting long specs in the common case.

    34     bool isAbout = false;

    35     uri->SchemeIs("about", &isAbout);

    36     if (!isAbout) {

    37       return false;

    38     }

    40     // Now check the spec itself

    41     nsAutoCString spec;

    42     uri->GetSpec(spec);

    43     return spec.Equals("about:feeds");

    44   }

    45 };

    47 }

The Tor Browser / file revision

content/base/src/FeedWriterEnabled.h@97036ab72558

content/base/src/FeedWriterEnabled.h