tor-browser

The Tor Browser
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ShadowRealmGlobalScope.cpp (4261B)

      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 "mozilla/dom/ShadowRealmGlobalScope.h"
      8 
      9 #include "js/TypeDecls.h"
     10 #include "js/loader/ModuleLoaderBase.h"
     11 #include "mozilla/dom/BindingDeclarations.h"
     12 #include "mozilla/dom/Document.h"
     13 #include "mozilla/dom/ModuleLoader.h"
     14 #include "mozilla/dom/ScriptLoader.h"
     15 #include "mozilla/dom/ShadowRealmGlobalScopeBinding.h"
     16 #include "nsGlobalWindowInner.h"
     17 #include "nsIGlobalObject.h"
     18 #include "xpcpublic.h"
     19 
     20 using namespace JS::loader;
     21 
     22 namespace mozilla::dom {
     23 
     24 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ShadowRealmGlobalScope, mModuleLoader,
     25                                      mCreatingGlobal)
     26 
     27 NS_IMPL_CYCLE_COLLECTING_ADDREF(ShadowRealmGlobalScope)
     28 NS_IMPL_CYCLE_COLLECTING_RELEASE(ShadowRealmGlobalScope)
     29 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ShadowRealmGlobalScope)
     30  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
     31  NS_INTERFACE_MAP_ENTRY(nsISupports)
     32  NS_INTERFACE_MAP_ENTRY(nsIGlobalObject)
     33  NS_INTERFACE_MAP_ENTRY(ShadowRealmGlobalScope)
     34 NS_INTERFACE_MAP_END
     35 
     36 JSObject* NewShadowRealmGlobal(JSContext* aCx, JS::RealmOptions& aOptions,
     37                               JSPrincipals* aPrincipals,
     38                               JS::Handle<JSObject*> aGlobalObj) {
     39  JS::Rooted<JSObject*> reflector(aCx);
     40  {
     41    RefPtr<ShadowRealmGlobalScope> scope;
     42    GlobalObject global(aCx, aGlobalObj);
     43 
     44    nsCOMPtr<nsIGlobalObject> nsGlobal =
     45        do_QueryInterface(global.GetAsSupports());
     46 
     47    MOZ_ASSERT(nsGlobal);
     48 
     49    scope = new ShadowRealmGlobalScope(nsGlobal);
     50    ShadowRealmGlobalScope_Binding::Wrap(aCx, scope, scope, aOptions,
     51                                         aPrincipals, &reflector);
     52  }
     53 
     54  return reflector;
     55 }
     56 
     57 static nsIGlobalObject* FindEnclosingNonShadowRealmGlobal(
     58    ShadowRealmGlobalScope* scope) {
     59  nsCOMPtr<nsIGlobalObject> global = scope->GetCreatingGlobal();
     60 
     61  do {
     62    nsCOMPtr<ShadowRealmGlobalScope> shadowRealmGlobalScope =
     63        do_QueryInterface(global);
     64    if (!shadowRealmGlobalScope) {
     65      break;
     66    }
     67 
     68    // Our global was a ShadowRealmGlobal; that's a problem, as we can't find a
     69    // window or worker global associated with a ShadowRealmGlobal... so we
     70    // continue following the chain.
     71    //
     72    // This will happen if you have nested ShadowRealms.
     73    global = shadowRealmGlobalScope->GetCreatingGlobal();
     74  } while (true);
     75 
     76  return global;
     77 }
     78 
     79 ModuleLoaderBase* ShadowRealmGlobalScope::GetModuleLoader(JSContext* aCx) {
     80  if (mModuleLoader) {
     81    return mModuleLoader;
     82  }
     83 
     84  // Note: if this fails, we don't need to report an exception, as one will be
     85  // reported by ModuleLoaderBase::GetCurrentModuleLoader.
     86 
     87  // Don't bother asking the ShadowRealmGlobal itself for a host object to get a
     88  // module loader from, instead, delegate to the enclosing global of the shadow
     89  // realm
     90  nsCOMPtr<nsIGlobalObject> global = FindEnclosingNonShadowRealmGlobal(this);
     91  MOZ_RELEASE_ASSERT(global);
     92 
     93  JSObject* object = global->GetGlobalJSObject();
     94  MOZ_ASSERT(object);
     95 
     96  // Currently Workers will never get here, because dynamic import is disabled
     97  // in Worker context, and so importValue will throw before we get here.
     98  //
     99  // See  https://bugzilla.mozilla.org/show_bug.cgi?id=1247687 and
    100  //      https://bugzilla.mozilla.org/show_bug.cgi?id=1772162
    101  nsGlobalWindowInner* window = xpc::WindowGlobalOrNull(object);
    102  if (!window) {
    103    return nullptr;
    104  }
    105 
    106  RefPtr<Document> doc = window->GetExtantDoc();
    107  if (!doc) {
    108    return nullptr;
    109  }
    110 
    111  ScriptLoader* scriptLoader = doc->GetScriptLoader();
    112  if (!scriptLoader) {
    113    return nullptr;
    114  }
    115 
    116  mModuleLoader = new ModuleLoader(scriptLoader, this, ModuleLoader::Normal);
    117 
    118  // Register the shadow realm module loader for tracing and ownership.
    119  scriptLoader->RegisterShadowRealmModuleLoader(
    120      static_cast<ModuleLoader*>(mModuleLoader.get()));
    121 
    122  return mModuleLoader;
    123 }
    124 
    125 bool IsShadowRealmGlobal(JSObject* aObject) {
    126  return IS_INSTANCE_OF(ShadowRealmGlobalScope, aObject);
    127 }
    128 
    129 }  // namespace mozilla::dom