dom/media/PrincipalHandle.h

   1 /* -*- Mode: C++; tab-width: 2; 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 file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef DOM_MEDIA_PRINCIPALHANDLE_H_
   7 #define DOM_MEDIA_PRINCIPALHANDLE_H_
   8
   9 #include "nsIPrincipal.h"
  10 #include "nsProxyRelease.h"
  11
  12 namespace mozilla {
  13 /**
  14  * We pass the principal through the MediaTrackGraph by wrapping it in a thread
  15  * safe nsMainThreadPtrHandle, since it cannot be used directly off the main
  16  * thread. We can compare two PrincipalHandles to each other on any thread, but
  17  * they can only be created and converted back to nsIPrincipal* on main thread.
  18  */
  19 typedef nsMainThreadPtrHandle<nsIPrincipal> PrincipalHandle;
  20
  21 inline PrincipalHandle MakePrincipalHandle(nsIPrincipal* aPrincipal) {
  22   RefPtr<nsMainThreadPtrHolder<nsIPrincipal>> holder =
  23       new nsMainThreadPtrHolder<nsIPrincipal>(
  24           "MakePrincipalHandle::nsIPrincipal", aPrincipal);
  25   return PrincipalHandle(holder);
  26 }
  27
  28 #define PRINCIPAL_HANDLE_NONE nullptr
  29
  30 inline nsIPrincipal* GetPrincipalFromHandle(
  31     const PrincipalHandle& aPrincipalHandle) {
  32   MOZ_ASSERT(NS_IsMainThread());
  33   return aPrincipalHandle.get();
  34 }
  35
  36 inline bool PrincipalHandleMatches(const PrincipalHandle& aPrincipalHandle,
  37                                    nsIPrincipal* aOther) {
  38   if (!aOther) {
  39     return false;
  40   }
  41
  42   nsIPrincipal* principal = GetPrincipalFromHandle(aPrincipalHandle);
  43   if (!principal) {
  44     return false;
  45   }
  46
  47   bool result;
  48   if (NS_FAILED(principal->Equals(aOther, &result))) {
  49     NS_ERROR("Principal check failed");
  50     return false;
  51   }
  52
  53   return result;
  54 }
  55 }  // namespace mozilla
  56
  57 #endif  // DOM_MEDIA_PRINCIPALHANDLE_H_