tor-browser

The Tor Browser
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WorkletModuleLoader.h (4972B)

      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 #ifndef mozilla_dom_worklet_WorkletModuleLoader_h
      8 #define mozilla_dom_worklet_WorkletModuleLoader_h
      9 
     10 #include "js/loader/LoadContextBase.h"
     11 #include "js/loader/ModuleLoaderBase.h"
     12 #include "js/loader/ResolveResult.h"  // For ResolveError
     13 #include "mozilla/dom/WorkletFetchHandler.h"
     14 
     15 namespace mozilla::dom {
     16 namespace loader {
     17 class WorkletScriptLoader : public JS::loader::ScriptLoaderInterface {
     18 public:
     19  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
     20  NS_DECL_CYCLE_COLLECTION_CLASS(WorkletScriptLoader)
     21 
     22  nsIURI* GetBaseURI() const override { return nullptr; }
     23 
     24  void ReportErrorToConsole(ScriptLoadRequest* aRequest,
     25                            nsresult aResult) const override {}
     26 
     27  void ReportWarningToConsole(
     28      ScriptLoadRequest* aRequest, const char* aMessageName,
     29      const nsTArray<nsString>& aParams) const override {}
     30 
     31  nsresult FillCompileOptionsForRequest(
     32      JSContext* cx, ScriptLoadRequest* aRequest, JS::CompileOptions* aOptions,
     33      JS::MutableHandle<JSScript*> aIntroductionScript) override;
     34 
     35 private:
     36  ~WorkletScriptLoader() = default;
     37 };
     38 
     39 class WorkletModuleLoader : public JS::loader::ModuleLoaderBase {
     40 public:
     41  NS_DECL_ISUPPORTS_INHERITED
     42  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(WorkletModuleLoader,
     43                                           JS::loader::ModuleLoaderBase)
     44 
     45  WorkletModuleLoader(WorkletScriptLoader* aScriptLoader,
     46                      nsIGlobalObject* aGlobalObject);
     47 
     48  void InsertRequest(nsIURI* aURI, JS::loader::ModuleLoadRequest* aRequest);
     49  void RemoveRequest(nsIURI* aURI);
     50  JS::loader::ModuleLoadRequest* GetRequest(nsIURI* aURI) const;
     51 
     52  bool HasSetLocalizedStrings() const { return (bool)mLocalizedStrs; }
     53  void SetLocalizedStrings(const nsTArray<nsString>* aStrings) {
     54    mLocalizedStrs = aStrings;
     55  }
     56 
     57 private:
     58  ~WorkletModuleLoader() = default;
     59 
     60  already_AddRefed<ModuleLoadRequest> CreateRequest(
     61      JSContext* aCx, nsIURI* aURI, JS::Handle<JSObject*> aModuleRequest,
     62      JS::Handle<JS::Value> aHostDefined, JS::Handle<JS::Value> aPayload,
     63      bool aIsDynamicImport, JS::loader::ScriptFetchOptions* aOptions,
     64      dom::ReferrerPolicy aReferrerPolicy, nsIURI* aBaseURL,
     65      const dom::SRIMetadata& aSriMetadata) override;
     66 
     67  bool IsDynamicImportSupported() override { return false; }
     68 
     69  bool CanStartLoad(JS::loader::ModuleLoadRequest* aRequest,
     70                    nsresult* aRvOut) override;
     71 
     72  nsresult StartFetch(JS::loader::ModuleLoadRequest* aRequest) override;
     73 
     74  nsresult CompileFetchedModule(
     75      JSContext* aCx, JS::Handle<JSObject*> aGlobal,
     76      JS::CompileOptions& aOptions, JS::loader::ModuleLoadRequest* aRequest,
     77      JS::MutableHandle<JSObject*> aModuleScript) override;
     78 
     79  nsresult CompileJavaScriptOrWasmModule(
     80      JSContext* aCx, JS::CompileOptions& aOptions, ModuleLoadRequest* aRequest,
     81      JS::MutableHandle<JSObject*> aModuleScript);
     82 
     83  nsresult CompileJsonModule(JSContext* aCx, JS::CompileOptions& aOptions,
     84                             ModuleLoadRequest* aRequest,
     85                             JS::MutableHandle<JSObject*> aModuleScript);
     86 
     87  void OnModuleLoadComplete(JS::loader::ModuleLoadRequest* aRequest) override;
     88 
     89  nsresult GetResolveFailureMessage(JS::loader::ResolveError aError,
     90                                    const nsAString& aSpecifier,
     91                                    nsAString& aResult) override;
     92 
     93  bool IsModuleTypeAllowed(JS::ModuleType aModuleType) override {
     94    // https://html.spec.whatwg.org/#module-type-allowed
     95    // If moduleType is "css" and the CSSStyleSheet interface is not exposed in
     96    // settings's realm, then return false.
     97    return aModuleType == JS::ModuleType::JavaScript ||
     98           aModuleType == JS::ModuleType::JSON;
     99  }
    100 
    101  // A hashtable to map a nsIURI(from main thread) to a ModuleLoadRequest(in
    102  // worklet thread).
    103  nsRefPtrHashtable<nsURIHashKey, JS::loader::ModuleLoadRequest>
    104      mFetchingRequests;
    105 
    106  // We get the localized strings on the main thread, and pass it to
    107  // WorkletModuleLoader.
    108  const nsTArray<nsString>* mLocalizedStrs = nullptr;
    109 };
    110 }  // namespace loader
    111 
    112 class WorkletLoadContext : public JS::loader::LoadContextBase {
    113 public:
    114  explicit WorkletLoadContext(
    115      const nsMainThreadPtrHandle<WorkletFetchHandler>& aHandlerRef)
    116      : JS::loader::LoadContextBase(JS::loader::ContextKind::Worklet),
    117        mHandlerRef(aHandlerRef) {}
    118 
    119  const nsMainThreadPtrHandle<WorkletFetchHandler>& GetHandlerRef() const {
    120    return mHandlerRef;
    121  }
    122 
    123 private:
    124  ~WorkletLoadContext() = default;
    125 
    126  nsMainThreadPtrHandle<WorkletFetchHandler> mHandlerRef;
    127 };
    128 }  // namespace mozilla::dom
    129 #endif  // mozilla_dom_worklet_WorkletModuleLoader_h