tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ChromeWorker.cpp (3116B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "ChromeWorker.h"
      8 
      9 #include "WorkerPrivate.h"
     10 #include "mozilla/AppShutdown.h"
     11 #include "mozilla/dom/BindingUtils.h"
     12 #include "mozilla/dom/WorkerBinding.h"
     13 #include "nsContentUtils.h"
     14 #include "nsIXPConnect.h"
     15 
     16 namespace mozilla::dom {
     17 
     18 /* static */
     19 already_AddRefed<ChromeWorker> ChromeWorker::Constructor(
     20    const GlobalObject& aGlobal, const nsAString& aScriptURL,
     21    const WorkerOptions& aOptions, ErrorResult& aRv) {
     22  // Dump the JS stack if somebody's creating a ChromeWorker after shutdown has
     23  // begun.  See bug 1813353.
     24  if (xpc::IsInAutomation() &&
     25      AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdown)) {
     26    NS_WARNING("ChromeWorker construction during shutdown");
     27    nsCOMPtr<nsIXPConnect> xpc = nsIXPConnect::XPConnect();
     28    (void)xpc->DebugDumpJSStack(true, true, false);
     29  }
     30 
     31  JSContext* cx = aGlobal.Context();
     32 
     33  RefPtr<WorkerPrivate> workerPrivate = WorkerPrivate::Constructor(
     34      cx, aScriptURL, true /* aIsChromeWorker */, WorkerKindDedicated,
     35      RequestCredentials::Omit, aOptions.mType, aOptions.mName, VoidCString(),
     36      nullptr /*aLoadInfo */, aRv);
     37  if (NS_WARN_IF(aRv.Failed())) {
     38    return nullptr;
     39  }
     40 
     41  nsCOMPtr<nsIGlobalObject> globalObject =
     42      do_QueryInterface(aGlobal.GetAsSupports());
     43 
     44  RefPtr<ChromeWorker> worker =
     45      new ChromeWorker(globalObject, workerPrivate.forget());
     46  return worker.forget();
     47 }
     48 
     49 /* static */
     50 bool ChromeWorker::WorkerAvailable(JSContext* aCx, JSObject* /* unused */) {
     51  // Chrome is always allowed to use workers, and content is never
     52  // allowed to use ChromeWorker, so all we have to check is the
     53  // caller.  However, chrome workers apparently might not have a
     54  // system principal, so we have to check for them manually.
     55  if (NS_IsMainThread()) {
     56    return nsContentUtils::IsSystemCaller(aCx);
     57  }
     58 
     59  return GetWorkerPrivateFromContext(aCx)->IsChromeWorker();
     60 }
     61 
     62 ChromeWorker::ChromeWorker(nsIGlobalObject* aGlobalObject,
     63                           already_AddRefed<WorkerPrivate> aWorkerPrivate)
     64    : Worker(aGlobalObject, std::move(aWorkerPrivate)) {}
     65 
     66 ChromeWorker::~ChromeWorker() = default;
     67 
     68 JSObject* ChromeWorker::WrapObject(JSContext* aCx,
     69                                   JS::Handle<JSObject*> aGivenProto) {
     70  JS::Rooted<JSObject*> wrapper(
     71      aCx, ChromeWorker_Binding::Wrap(aCx, this, aGivenProto));
     72  if (wrapper) {
     73    // Most DOM objects don't assume they have a reflector. If they don't have
     74    // one and need one, they create it. But in workers code, we assume that the
     75    // reflector is always present.  In order to guarantee that it's always
     76    // present, we have to preserve it. Otherwise the GC will happily collect it
     77    // as needed.
     78    MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
     79  }
     80 
     81  return wrapper;
     82 }
     83 
     84 }  // namespace mozilla::dom