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Diffstat (limited to 'dom/base/nsScriptLoader.cpp')
| -rw-r--r-- | dom/base/nsScriptLoader.cpp | 3016 |
1 files changed, 3016 insertions, 0 deletions
diff --git a/dom/base/nsScriptLoader.cpp b/dom/base/nsScriptLoader.cpp new file mode 100644 index 000000000..6c732db6c --- /dev/null +++ b/dom/base/nsScriptLoader.cpp @@ -0,0 +1,3016 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * A class that handles loading and evaluation of <script> elements. + */ + +#include "nsScriptLoader.h" + +#include "prsystem.h" +#include "jsapi.h" +#include "jsfriendapi.h" +#include "xpcpublic.h" +#include "nsCycleCollectionParticipant.h" +#include "nsIContent.h" +#include "nsJSUtils.h" +#include "mozilla/dom/ScriptSettings.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/SRILogHelper.h" +#include "nsGkAtoms.h" +#include "nsNetUtil.h" +#include "nsIScriptGlobalObject.h" +#include "nsIScriptContext.h" +#include "nsIScriptSecurityManager.h" +#include "nsIPrincipal.h" +#include "nsJSPrincipals.h" +#include "nsContentPolicyUtils.h" +#include "nsIHttpChannel.h" +#include "nsIHttpChannelInternal.h" +#include "nsIClassOfService.h" +#include "nsITimedChannel.h" +#include "nsIScriptElement.h" +#include "nsIDOMHTMLScriptElement.h" +#include "nsIDocShell.h" +#include "nsContentUtils.h" +#include "nsUnicharUtils.h" +#include "nsAutoPtr.h" +#include "nsIXPConnect.h" +#include "nsError.h" +#include "nsThreadUtils.h" +#include "nsDocShellCID.h" +#include "nsIContentSecurityPolicy.h" +#include "mozilla/Logging.h" +#include "nsCRT.h" +#include "nsContentCreatorFunctions.h" +#include "nsProxyRelease.h" +#include "nsSandboxFlags.h" +#include "nsContentTypeParser.h" +#include "nsINetworkPredictor.h" +#include "ImportManager.h" +#include "mozilla/dom/EncodingUtils.h" +#include "mozilla/ConsoleReportCollector.h" + +#include "mozilla/Attributes.h" +#include "mozilla/Unused.h" +#include "nsIScriptError.h" + +using namespace mozilla; +using namespace mozilla::dom; + +using JS::SourceBufferHolder; + +static LazyLogModule gCspPRLog("CSP"); + +void +ImplCycleCollectionUnlink(nsScriptLoadRequestList& aField); + +void +ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback, + nsScriptLoadRequestList& aField, + const char* aName, + uint32_t aFlags = 0); + +////////////////////////////////////////////////////////////// +// nsScriptLoadRequest +////////////////////////////////////////////////////////////// + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptLoadRequest) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTION_0(nsScriptLoadRequest) + +NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptLoadRequest) +NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptLoadRequest) + +nsScriptLoadRequest::~nsScriptLoadRequest() +{ + js_free(mScriptTextBuf); + + // We should always clean up any off-thread script parsing resources. + MOZ_ASSERT(!mOffThreadToken); + + // But play it safe in release builds and try to clean them up here + // as a fail safe. + MaybeCancelOffThreadScript(); +} + +void +nsScriptLoadRequest::SetReady() +{ + MOZ_ASSERT(mProgress != Progress::Ready); + mProgress = Progress::Ready; +} + +void +nsScriptLoadRequest::Cancel() +{ + MaybeCancelOffThreadScript(); + mIsCanceled = true; +} + +void +nsScriptLoadRequest::MaybeCancelOffThreadScript() +{ + MOZ_ASSERT(NS_IsMainThread()); + + if (!mOffThreadToken) { + return; + } + + JSContext* cx = danger::GetJSContext(); + JS::CancelOffThreadScript(cx, mOffThreadToken); + mOffThreadToken = nullptr; +} + +////////////////////////////////////////////////////////////// +// nsModuleLoadRequest +////////////////////////////////////////////////////////////// + +// A load request for a module, created for every top level module script and +// every module import. Load request can share an nsModuleScript if there are +// multiple imports of the same module. + +class nsModuleLoadRequest final : public nsScriptLoadRequest +{ + ~nsModuleLoadRequest() {} + + nsModuleLoadRequest(const nsModuleLoadRequest& aOther) = delete; + nsModuleLoadRequest(nsModuleLoadRequest&& aOther) = delete; + +public: + NS_DECL_ISUPPORTS_INHERITED + NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest) + + nsModuleLoadRequest(nsIScriptElement* aElement, + uint32_t aVersion, + CORSMode aCORSMode, + const SRIMetadata& aIntegrity, + nsScriptLoader* aLoader); + + bool IsTopLevel() const { + return mIsTopLevel; + } + + void SetReady() override; + void Cancel() override; + + void ModuleLoaded(); + void DependenciesLoaded(); + void LoadFailed(); + + // Is this a request for a top level module script or an import? + bool mIsTopLevel; + + // The base URL used for resolving relative module imports. + nsCOMPtr<nsIURI> mBaseURL; + + // Pointer to the script loader, used to trigger actions when the module load + // finishes. + RefPtr<nsScriptLoader> mLoader; + + // The importing module, or nullptr for top level module scripts. Used to + // implement the ancestor list checked when fetching module dependencies. + RefPtr<nsModuleLoadRequest> mParent; + + // Set to a module script object after a successful load or nullptr on + // failure. + RefPtr<nsModuleScript> mModuleScript; + + // A promise that is completed on successful load of this module and all of + // its dependencies, indicating that the module is ready for instantiation and + // evaluation. + MozPromiseHolder<GenericPromise> mReady; + + // Array of imported modules. + nsTArray<RefPtr<nsModuleLoadRequest>> mImports; +}; + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsModuleLoadRequest) +NS_INTERFACE_MAP_END_INHERITING(nsScriptLoadRequest) + +NS_IMPL_CYCLE_COLLECTION_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest, + mBaseURL, + mLoader, + mParent, + mModuleScript, + mImports) + +NS_IMPL_ADDREF_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest) +NS_IMPL_RELEASE_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest) + +nsModuleLoadRequest::nsModuleLoadRequest(nsIScriptElement* aElement, + uint32_t aVersion, + CORSMode aCORSMode, + const SRIMetadata &aIntegrity, + nsScriptLoader* aLoader) + : nsScriptLoadRequest(nsScriptKind::Module, + aElement, + aVersion, + aCORSMode, + aIntegrity), + mIsTopLevel(true), + mLoader(aLoader) +{} + +inline nsModuleLoadRequest* +nsScriptLoadRequest::AsModuleRequest() +{ + MOZ_ASSERT(IsModuleRequest()); + return static_cast<nsModuleLoadRequest*>(this); +} + +void nsModuleLoadRequest::Cancel() +{ + nsScriptLoadRequest::Cancel(); + mModuleScript = nullptr; + mProgress = nsScriptLoadRequest::Progress::Ready; + for (size_t i = 0; i < mImports.Length(); i++) { + mImports[i]->Cancel(); + } + mReady.RejectIfExists(NS_ERROR_FAILURE, __func__); +} + +void +nsModuleLoadRequest::SetReady() +{ +#ifdef DEBUG + for (size_t i = 0; i < mImports.Length(); i++) { + MOZ_ASSERT(mImports[i]->IsReadyToRun()); + } +#endif + + nsScriptLoadRequest::SetReady(); + mReady.ResolveIfExists(true, __func__); +} + +void +nsModuleLoadRequest::ModuleLoaded() +{ + // A module that was found to be marked as fetching in the module map has now + // been loaded. + + mModuleScript = mLoader->GetFetchedModule(mURI); + mLoader->StartFetchingModuleDependencies(this); +} + +void +nsModuleLoadRequest::DependenciesLoaded() +{ + // The module and all of its dependencies have been successfully fetched and + // compiled. + + if (!mLoader->InstantiateModuleTree(this)) { + LoadFailed(); + return; + } + + SetReady(); + mLoader->ProcessLoadedModuleTree(this); + mLoader = nullptr; + mParent = nullptr; +} + +void +nsModuleLoadRequest::LoadFailed() +{ + Cancel(); + mLoader->ProcessLoadedModuleTree(this); + mLoader = nullptr; + mParent = nullptr; +} + +////////////////////////////////////////////////////////////// +// nsModuleScript +////////////////////////////////////////////////////////////// + +// A single module script. May be used to satisfy multiple load requests. + +class nsModuleScript final : public nsISupports +{ + enum InstantiationState { + Uninstantiated, + Instantiated, + Errored + }; + + RefPtr<nsScriptLoader> mLoader; + nsCOMPtr<nsIURI> mBaseURL; + JS::Heap<JSObject*> mModuleRecord; + JS::Heap<JS::Value> mException; + InstantiationState mInstantiationState; + + ~nsModuleScript(); + +public: + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsModuleScript) + + nsModuleScript(nsScriptLoader* aLoader, + nsIURI* aBaseURL, + JS::Handle<JSObject*> aModuleRecord); + + nsScriptLoader* Loader() const { return mLoader; } + JSObject* ModuleRecord() const { return mModuleRecord; } + JS::Value Exception() const { return mException; } + nsIURI* BaseURL() const { return mBaseURL; } + + void SetInstantiationResult(JS::Handle<JS::Value> aMaybeException); + bool IsUninstantiated() const { + return mInstantiationState == Uninstantiated; + } + bool IsInstantiated() const { + return mInstantiationState == Instantiated; + } + bool InstantiationFailed() const { + return mInstantiationState == Errored; + } + + void UnlinkModuleRecord(); +}; + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsModuleScript) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTION_CLASS(nsModuleScript) + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsModuleScript) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL) + tmp->UnlinkModuleRecord(); +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsModuleScript) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsModuleScript) + NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord) + NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mException) +NS_IMPL_CYCLE_COLLECTION_TRACE_END + +NS_IMPL_CYCLE_COLLECTING_ADDREF(nsModuleScript) +NS_IMPL_CYCLE_COLLECTING_RELEASE(nsModuleScript) + +nsModuleScript::nsModuleScript(nsScriptLoader *aLoader, nsIURI* aBaseURL, + JS::Handle<JSObject*> aModuleRecord) + : mLoader(aLoader), + mBaseURL(aBaseURL), + mModuleRecord(aModuleRecord), + mInstantiationState(Uninstantiated) +{ + MOZ_ASSERT(mLoader); + MOZ_ASSERT(mBaseURL); + MOZ_ASSERT(mModuleRecord); + MOZ_ASSERT(mException.isUndefined()); + + // Make module's host defined field point to this module script object. + // This is cleared in the UnlinkModuleRecord(). + JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this)); + HoldJSObjects(this); +} + +void +nsModuleScript::UnlinkModuleRecord() +{ + // Remove module's back reference to this object request if present. + if (mModuleRecord) { + MOZ_ASSERT(JS::GetModuleHostDefinedField(mModuleRecord).toPrivate() == + this); + JS::SetModuleHostDefinedField(mModuleRecord, JS::UndefinedValue()); + } + mModuleRecord = nullptr; + mException.setUndefined(); +} + +nsModuleScript::~nsModuleScript() +{ + if (mModuleRecord) { + // The object may be destroyed without being unlinked first. + UnlinkModuleRecord(); + } + DropJSObjects(this); +} + +void +nsModuleScript::SetInstantiationResult(JS::Handle<JS::Value> aMaybeException) +{ + MOZ_ASSERT(mInstantiationState == Uninstantiated); + MOZ_ASSERT(mModuleRecord); + MOZ_ASSERT(mException.isUndefined()); + + if (aMaybeException.isUndefined()) { + mInstantiationState = Instantiated; + } else { + mModuleRecord = nullptr; + mException = aMaybeException; + mInstantiationState = Errored; + } +} + +////////////////////////////////////////////////////////////// + +// nsScriptLoadRequestList +////////////////////////////////////////////////////////////// + +nsScriptLoadRequestList::~nsScriptLoadRequestList() +{ + Clear(); +} + +void +nsScriptLoadRequestList::Clear() +{ + while (!isEmpty()) { + RefPtr<nsScriptLoadRequest> first = StealFirst(); + first->Cancel(); + // And just let it go out of scope and die. + } +} + +#ifdef DEBUG +bool +nsScriptLoadRequestList::Contains(nsScriptLoadRequest* aElem) const +{ + for (const nsScriptLoadRequest* req = getFirst(); + req; req = req->getNext()) { + if (req == aElem) { + return true; + } + } + + return false; +} +#endif // DEBUG + +inline void +ImplCycleCollectionUnlink(nsScriptLoadRequestList& aField) +{ + while (!aField.isEmpty()) { + RefPtr<nsScriptLoadRequest> first = aField.StealFirst(); + } +} + +inline void +ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback, + nsScriptLoadRequestList& aField, + const char* aName, + uint32_t aFlags) +{ + for (nsScriptLoadRequest* request = aField.getFirst(); + request; request = request->getNext()) + { + CycleCollectionNoteChild(aCallback, request, aName, aFlags); + } +} + +////////////////////////////////////////////////////////////// +// nsScriptLoader::PreloadInfo +////////////////////////////////////////////////////////////// + +inline void +ImplCycleCollectionUnlink(nsScriptLoader::PreloadInfo& aField) +{ + ImplCycleCollectionUnlink(aField.mRequest); +} + +inline void +ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback, + nsScriptLoader::PreloadInfo& aField, + const char* aName, + uint32_t aFlags = 0) +{ + ImplCycleCollectionTraverse(aCallback, aField.mRequest, aName, aFlags); +} + +////////////////////////////////////////////////////////////// +// nsScriptLoader +////////////////////////////////////////////////////////////// + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptLoader) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTION(nsScriptLoader, + mNonAsyncExternalScriptInsertedRequests, + mLoadingAsyncRequests, + mLoadedAsyncRequests, + mDeferRequests, + mXSLTRequests, + mParserBlockingRequest, + mPreloads, + mPendingChildLoaders, + mFetchedModules) + +NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptLoader) +NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptLoader) + +nsScriptLoader::nsScriptLoader(nsIDocument *aDocument) + : mDocument(aDocument), + mParserBlockingBlockerCount(0), + mBlockerCount(0), + mNumberOfProcessors(0), + mEnabled(true), + mDeferEnabled(false), + mDocumentParsingDone(false), + mBlockingDOMContentLoaded(false), + mReporter(new ConsoleReportCollector()) +{ +} + +nsScriptLoader::~nsScriptLoader() +{ + mObservers.Clear(); + + if (mParserBlockingRequest) { + mParserBlockingRequest->FireScriptAvailable(NS_ERROR_ABORT); + } + + for (nsScriptLoadRequest* req = mXSLTRequests.getFirst(); req; + req = req->getNext()) { + req->FireScriptAvailable(NS_ERROR_ABORT); + } + + for (nsScriptLoadRequest* req = mDeferRequests.getFirst(); req; + req = req->getNext()) { + req->FireScriptAvailable(NS_ERROR_ABORT); + } + + for (nsScriptLoadRequest* req = mLoadingAsyncRequests.getFirst(); req; + req = req->getNext()) { + req->FireScriptAvailable(NS_ERROR_ABORT); + } + + for (nsScriptLoadRequest* req = mLoadedAsyncRequests.getFirst(); req; + req = req->getNext()) { + req->FireScriptAvailable(NS_ERROR_ABORT); + } + + for(nsScriptLoadRequest* req = mNonAsyncExternalScriptInsertedRequests.getFirst(); + req; + req = req->getNext()) { + req->FireScriptAvailable(NS_ERROR_ABORT); + } + + // Unblock the kids, in case any of them moved to a different document + // subtree in the meantime and therefore aren't actually going away. + for (uint32_t j = 0; j < mPendingChildLoaders.Length(); ++j) { + mPendingChildLoaders[j]->RemoveParserBlockingScriptExecutionBlocker(); + } +} + +// Helper method for checking if the script element is an event-handler +// This means that it has both a for-attribute and a event-attribute. +// Also, if the for-attribute has a value that matches "\s*window\s*", +// and the event-attribute matches "\s*onload([ \(].*)?" then it isn't an +// eventhandler. (both matches are case insensitive). +// This is how IE seems to filter out a window's onload handler from a +// <script for=... event=...> element. + +static bool +IsScriptEventHandler(nsIContent* aScriptElement) +{ + if (!aScriptElement->IsHTMLElement()) { + return false; + } + + nsAutoString forAttr, eventAttr; + if (!aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::_for, forAttr) || + !aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::event, eventAttr)) { + return false; + } + + const nsAString& for_str = + nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(forAttr); + if (!for_str.LowerCaseEqualsLiteral("window")) { + return true; + } + + // We found for="window", now check for event="onload". + const nsAString& event_str = + nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(eventAttr, false); + if (!StringBeginsWith(event_str, NS_LITERAL_STRING("onload"), + nsCaseInsensitiveStringComparator())) { + // It ain't "onload.*". + + return true; + } + + nsAutoString::const_iterator start, end; + event_str.BeginReading(start); + event_str.EndReading(end); + + start.advance(6); // advance past "onload" + + if (start != end && *start != '(' && *start != ' ') { + // We got onload followed by something other than space or + // '('. Not good enough. + + return true; + } + + return false; +} + +nsresult +nsScriptLoader::CheckContentPolicy(nsIDocument* aDocument, + nsISupports *aContext, + nsIURI *aURI, + const nsAString &aType, + bool aIsPreLoad) +{ + nsContentPolicyType contentPolicyType = aIsPreLoad + ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD + : nsIContentPolicy::TYPE_INTERNAL_SCRIPT; + + int16_t shouldLoad = nsIContentPolicy::ACCEPT; + nsresult rv = NS_CheckContentLoadPolicy(contentPolicyType, + aURI, + aDocument->NodePrincipal(), + aContext, + NS_LossyConvertUTF16toASCII(aType), + nullptr, //extra + &shouldLoad, + nsContentUtils::GetContentPolicy(), + nsContentUtils::GetSecurityManager()); + if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) { + if (NS_FAILED(rv) || shouldLoad != nsIContentPolicy::REJECT_TYPE) { + return NS_ERROR_CONTENT_BLOCKED; + } + return NS_ERROR_CONTENT_BLOCKED_SHOW_ALT; + } + + return NS_OK; +} + +bool +nsScriptLoader::ModuleMapContainsModule(nsModuleLoadRequest *aRequest) const +{ + // Returns whether we have fetched, or are currently fetching, a module script + // for the request's URL. + return mFetchingModules.Contains(aRequest->mURI) || + mFetchedModules.Contains(aRequest->mURI); +} + +bool +nsScriptLoader::IsFetchingModule(nsModuleLoadRequest *aRequest) const +{ + bool fetching = mFetchingModules.Contains(aRequest->mURI); + MOZ_ASSERT_IF(fetching, !mFetchedModules.Contains(aRequest->mURI)); + return fetching; +} + +void +nsScriptLoader::SetModuleFetchStarted(nsModuleLoadRequest *aRequest) +{ + // Update the module map to indicate that a module is currently being fetched. + + MOZ_ASSERT(aRequest->IsLoading()); + MOZ_ASSERT(!ModuleMapContainsModule(aRequest)); + mFetchingModules.Put(aRequest->mURI, nullptr); +} + +void +nsScriptLoader::SetModuleFetchFinishedAndResumeWaitingRequests(nsModuleLoadRequest *aRequest, + nsresult aResult) +{ + // Update module map with the result of fetching a single module script. The + // module script pointer is nullptr on error. + + MOZ_ASSERT(!aRequest->IsReadyToRun()); + + RefPtr<GenericPromise::Private> promise; + MOZ_ALWAYS_TRUE(mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise))); + mFetchingModules.Remove(aRequest->mURI); + + RefPtr<nsModuleScript> ms(aRequest->mModuleScript); + MOZ_ASSERT(NS_SUCCEEDED(aResult) == (ms != nullptr)); + mFetchedModules.Put(aRequest->mURI, ms); + + if (promise) { + if (ms) { + promise->Resolve(true, __func__); + } else { + promise->Reject(aResult, __func__); + } + } +} + +RefPtr<GenericPromise> +nsScriptLoader::WaitForModuleFetch(nsModuleLoadRequest *aRequest) +{ + MOZ_ASSERT(ModuleMapContainsModule(aRequest)); + + RefPtr<GenericPromise::Private> promise; + if (mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise))) { + if (!promise) { + promise = new GenericPromise::Private(__func__); + mFetchingModules.Put(aRequest->mURI, promise); + } + return promise; + } + + RefPtr<nsModuleScript> ms; + MOZ_ALWAYS_TRUE(mFetchedModules.Get(aRequest->mURI, getter_AddRefs(ms))); + if (!ms) { + return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__); + } + + return GenericPromise::CreateAndResolve(true, __func__); +} + +nsModuleScript* +nsScriptLoader::GetFetchedModule(nsIURI* aURL) const +{ + bool found; + nsModuleScript* ms = mFetchedModules.GetWeak(aURL, &found); + MOZ_ASSERT(found); + return ms; +} + +nsresult +nsScriptLoader::ProcessFetchedModuleSource(nsModuleLoadRequest* aRequest) +{ + MOZ_ASSERT(!aRequest->mModuleScript); + + nsresult rv = CreateModuleScript(aRequest); + SetModuleFetchFinishedAndResumeWaitingRequests(aRequest, rv); + + free(aRequest->mScriptTextBuf); + aRequest->mScriptTextBuf = nullptr; + aRequest->mScriptTextLength = 0; + + if (NS_SUCCEEDED(rv)) { + StartFetchingModuleDependencies(aRequest); + } + + return rv; +} + +nsresult +nsScriptLoader::CreateModuleScript(nsModuleLoadRequest* aRequest) +{ + MOZ_ASSERT(!aRequest->mModuleScript); + MOZ_ASSERT(aRequest->mBaseURL); + + nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject(); + if (!globalObject) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext(); + if (!context) { + return NS_ERROR_FAILURE; + } + + nsAutoMicroTask mt; + AutoEntryScript aes(globalObject, "CompileModule", true); + + bool oldProcessingScriptTag = context->GetProcessingScriptTag(); + context->SetProcessingScriptTag(true); + + nsresult rv; + { + // Update our current script. + AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement); + Maybe<AutoCurrentScriptUpdater> masterScriptUpdater; + nsCOMPtr<nsIDocument> master = mDocument->MasterDocument(); + if (master != mDocument) { + masterScriptUpdater.emplace(master->ScriptLoader(), + aRequest->mElement); + } + + JSContext* cx = aes.cx(); + JS::Rooted<JSObject*> module(cx); + + if (aRequest->mWasCompiledOMT) { + module = JS::FinishOffThreadModule(cx, aRequest->mOffThreadToken); + aRequest->mOffThreadToken = nullptr; + rv = module ? NS_OK : NS_ERROR_FAILURE; + } else { + JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject()); + + JS::CompileOptions options(cx); + rv = FillCompileOptionsForRequest(aes, aRequest, global, &options); + + if (NS_SUCCEEDED(rv)) { + nsAutoString inlineData; + SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData); + rv = nsJSUtils::CompileModule(cx, srcBuf, global, options, &module); + } + } + MOZ_ASSERT(NS_SUCCEEDED(rv) == (module != nullptr)); + if (module) { + aRequest->mModuleScript = + new nsModuleScript(this, aRequest->mBaseURL, module); + } + } + + context->SetProcessingScriptTag(oldProcessingScriptTag); + + return rv; +} + +static bool +ThrowTypeError(JSContext* aCx, nsModuleScript* aScript, + const nsString& aMessage) +{ + JS::Rooted<JSObject*> module(aCx, aScript->ModuleRecord()); + JS::Rooted<JSScript*> script(aCx, JS::GetModuleScript(aCx, module)); + JS::Rooted<JSString*> filename(aCx); + filename = JS_NewStringCopyZ(aCx, JS_GetScriptFilename(script)); + if (!filename) { + return false; + } + + JS::Rooted<JSString*> message(aCx, JS_NewUCStringCopyZ(aCx, aMessage.get())); + if (!message) { + return false; + } + + JS::Rooted<JS::Value> error(aCx); + if (!JS::CreateError(aCx, JSEXN_TYPEERR, nullptr, filename, 0, 0, nullptr, + message, &error)) { + return false; + } + + JS_SetPendingException(aCx, error); + return false; +} + +static bool +HandleResolveFailure(JSContext* aCx, nsModuleScript* aScript, + const nsAString& aSpecifier) +{ + // TODO: How can we get the line number of the failed import? + + nsAutoString message(NS_LITERAL_STRING("Error resolving module specifier: ")); + message.Append(aSpecifier); + + return ThrowTypeError(aCx, aScript, message); +} + +static bool +HandleModuleNotFound(JSContext* aCx, nsModuleScript* aScript, + const nsAString& aSpecifier) +{ + // TODO: How can we get the line number of the failed import? + + nsAutoString message(NS_LITERAL_STRING("Resolved module not found in map: ")); + message.Append(aSpecifier); + + return ThrowTypeError(aCx, aScript, message); +} + +static already_AddRefed<nsIURI> +ResolveModuleSpecifier(nsModuleScript* aScript, + const nsAString& aSpecifier) +{ + // The following module specifiers are allowed by the spec: + // - a valid absolute URL + // - a valid relative URL that starts with "/", "./" or "../" + // + // Bareword module specifiers are currently disallowed as these may be given + // special meanings in the future. + + nsCOMPtr<nsIURI> uri; + nsresult rv = NS_NewURI(getter_AddRefs(uri), aSpecifier); + if (NS_SUCCEEDED(rv)) { + return uri.forget(); + } + + if (rv != NS_ERROR_MALFORMED_URI) { + return nullptr; + } + + if (!StringBeginsWith(aSpecifier, NS_LITERAL_STRING("/")) && + !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("./")) && + !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("../"))) { + return nullptr; + } + + rv = NS_NewURI(getter_AddRefs(uri), aSpecifier, nullptr, aScript->BaseURL()); + if (NS_SUCCEEDED(rv)) { + return uri.forget(); + } + + return nullptr; +} + +static nsresult +RequestedModuleIsInAncestorList(nsModuleLoadRequest* aRequest, nsIURI* aURL, bool* aResult) +{ + const size_t ImportDepthLimit = 100; + + *aResult = false; + size_t depth = 0; + while (aRequest) { + if (depth++ == ImportDepthLimit) { + return NS_ERROR_FAILURE; + } + + bool equal; + nsresult rv = aURL->Equals(aRequest->mURI, &equal); + NS_ENSURE_SUCCESS(rv, rv); + if (equal) { + *aResult = true; + return NS_OK; + } + + aRequest = aRequest->mParent; + } + + return NS_OK; +} + +static nsresult +ResolveRequestedModules(nsModuleLoadRequest* aRequest, nsCOMArray<nsIURI> &aUrls) +{ + nsModuleScript* ms = aRequest->mModuleScript; + + AutoJSAPI jsapi; + if (!jsapi.Init(ms->ModuleRecord())) { + return NS_ERROR_FAILURE; + } + + JSContext* cx = jsapi.cx(); + JS::Rooted<JSObject*> moduleRecord(cx, ms->ModuleRecord()); + JS::Rooted<JSObject*> specifiers(cx, JS::GetRequestedModules(cx, moduleRecord)); + + uint32_t length; + if (!JS_GetArrayLength(cx, specifiers, &length)) { + return NS_ERROR_FAILURE; + } + + JS::Rooted<JS::Value> val(cx); + for (uint32_t i = 0; i < length; i++) { + if (!JS_GetElement(cx, specifiers, i, &val)) { + return NS_ERROR_FAILURE; + } + + nsAutoJSString specifier; + if (!specifier.init(cx, val)) { + return NS_ERROR_FAILURE; + } + + // Let url be the result of resolving a module specifier given module script and requested. + nsModuleScript* ms = aRequest->mModuleScript; + nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(ms, specifier); + if (!uri) { + HandleResolveFailure(cx, ms, specifier); + return NS_ERROR_FAILURE; + } + + bool isAncestor; + nsresult rv = RequestedModuleIsInAncestorList(aRequest, uri, &isAncestor); + NS_ENSURE_SUCCESS(rv, rv); + if (!isAncestor) { + aUrls.AppendElement(uri.forget()); + } + } + + return NS_OK; +} + +void +nsScriptLoader::StartFetchingModuleDependencies(nsModuleLoadRequest* aRequest) +{ + MOZ_ASSERT(aRequest->mModuleScript); + MOZ_ASSERT(!aRequest->IsReadyToRun()); + aRequest->mProgress = nsModuleLoadRequest::Progress::FetchingImports; + + nsCOMArray<nsIURI> urls; + nsresult rv = ResolveRequestedModules(aRequest, urls); + if (NS_FAILED(rv)) { + aRequest->LoadFailed(); + return; + } + + if (urls.Length() == 0) { + // There are no descendents to load so this request is ready. + aRequest->DependenciesLoaded(); + return; + } + + // For each url in urls, fetch a module script tree given url, module script's + // CORS setting, and module script's settings object. + nsTArray<RefPtr<GenericPromise>> importsReady; + for (size_t i = 0; i < urls.Length(); i++) { + RefPtr<GenericPromise> childReady = + StartFetchingModuleAndDependencies(aRequest, urls[i]); + importsReady.AppendElement(childReady); + } + + // Wait for all imports to become ready. + RefPtr<GenericPromise::AllPromiseType> allReady = + GenericPromise::All(AbstractThread::GetCurrent(), importsReady); + allReady->Then(AbstractThread::GetCurrent(), __func__, aRequest, + &nsModuleLoadRequest::DependenciesLoaded, + &nsModuleLoadRequest::LoadFailed); +} + +RefPtr<GenericPromise> +nsScriptLoader::StartFetchingModuleAndDependencies(nsModuleLoadRequest* aRequest, + nsIURI* aURI) +{ + MOZ_ASSERT(aURI); + + RefPtr<nsModuleLoadRequest> childRequest = + new nsModuleLoadRequest(aRequest->mElement, aRequest->mJSVersion, + aRequest->mCORSMode, aRequest->mIntegrity, this); + + childRequest->mIsTopLevel = false; + childRequest->mURI = aURI; + childRequest->mIsInline = false; + childRequest->mReferrerPolicy = aRequest->mReferrerPolicy; + childRequest->mParent = aRequest; + + RefPtr<GenericPromise> ready = childRequest->mReady.Ensure(__func__); + + nsresult rv = StartLoad(childRequest, NS_LITERAL_STRING("module"), false); + if (NS_FAILED(rv)) { + childRequest->mReady.Reject(rv, __func__); + return ready; + } + + aRequest->mImports.AppendElement(childRequest); + return ready; +} + +bool +HostResolveImportedModule(JSContext* aCx, unsigned argc, JS::Value* vp) +{ + MOZ_ASSERT(argc == 2); + JS::CallArgs args = JS::CallArgsFromVp(argc, vp); + JS::Rooted<JSObject*> module(aCx, &args[0].toObject()); + JS::Rooted<JSString*> specifier(aCx, args[1].toString()); + + // Let referencing module script be referencingModule.[[HostDefined]]. + JS::Value value = JS::GetModuleHostDefinedField(module); + auto script = static_cast<nsModuleScript*>(value.toPrivate()); + MOZ_ASSERT(script->ModuleRecord() == module); + + // Let url be the result of resolving a module specifier given referencing + // module script and specifier. If the result is failure, throw a TypeError + // exception and abort these steps. + nsAutoJSString string; + if (!string.init(aCx, specifier)) { + return false; + } + + nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(script, string); + if (!uri) { + return HandleResolveFailure(aCx, script, string); + } + + // Let resolved module script be the value of the entry in module map whose + // key is url. If no such entry exists, throw a TypeError exception and abort + // these steps. + nsModuleScript* ms = script->Loader()->GetFetchedModule(uri); + if (!ms) { + return HandleModuleNotFound(aCx, script, string); + } + + if (ms->InstantiationFailed()) { + JS::Rooted<JS::Value> exception(aCx, ms->Exception()); + JS_SetPendingException(aCx, exception); + return false; + } + + *vp = JS::ObjectValue(*ms->ModuleRecord()); + return true; +} + +static nsresult +EnsureModuleResolveHook(JSContext* aCx) +{ + if (JS::GetModuleResolveHook(aCx)) { + return NS_OK; + } + + JS::Rooted<JSFunction*> func(aCx); + func = JS_NewFunction(aCx, HostResolveImportedModule, 2, 0, + "HostResolveImportedModule"); + if (!func) { + return NS_ERROR_FAILURE; + } + + JS::SetModuleResolveHook(aCx, func); + return NS_OK; +} + +void +nsScriptLoader::ProcessLoadedModuleTree(nsModuleLoadRequest* aRequest) +{ + if (aRequest->IsTopLevel()) { + MaybeMoveToLoadedList(aRequest); + ProcessPendingRequests(); + } + + if (aRequest->mWasCompiledOMT) { + mDocument->UnblockOnload(false); + } +} + +bool +nsScriptLoader::InstantiateModuleTree(nsModuleLoadRequest* aRequest) +{ + // Perform eager instantiation of the loaded module tree. + + MOZ_ASSERT(aRequest); + + nsModuleScript* ms = aRequest->mModuleScript; + MOZ_ASSERT(ms); + if (!ms->ModuleRecord()) { + return false; + } + + AutoJSAPI jsapi; + if (NS_WARN_IF(!jsapi.Init(ms->ModuleRecord()))) { + return false; + } + + nsresult rv = EnsureModuleResolveHook(jsapi.cx()); + NS_ENSURE_SUCCESS(rv, false); + + JS::Rooted<JSObject*> module(jsapi.cx(), ms->ModuleRecord()); + bool ok = NS_SUCCEEDED(nsJSUtils::ModuleDeclarationInstantiation(jsapi.cx(), module)); + + JS::RootedValue exception(jsapi.cx()); + if (!ok) { + MOZ_ASSERT(jsapi.HasException()); + if (!jsapi.StealException(&exception)) { + return false; + } + MOZ_ASSERT(!exception.isUndefined()); + } + + // Mark this module and any uninstantiated dependencies found via depth-first + // search as instantiated and record any error. + + mozilla::Vector<nsModuleLoadRequest*, 1> requests; + if (!requests.append(aRequest)) { + return false; + } + + while (!requests.empty()) { + nsModuleLoadRequest* request = requests.popCopy(); + nsModuleScript* ms = request->mModuleScript; + if (!ms->IsUninstantiated()) { + continue; + } + + ms->SetInstantiationResult(exception); + + for (auto import : request->mImports) { + if (import->mModuleScript->IsUninstantiated() && + !requests.append(import)) + { + return false; + } + } + } + + return true; +} + +nsresult +nsScriptLoader::StartLoad(nsScriptLoadRequest *aRequest, const nsAString &aType, + bool aScriptFromHead) +{ + MOZ_ASSERT(aRequest->IsLoading()); + NS_ENSURE_TRUE(mDocument, NS_ERROR_NULL_POINTER); + + // If this document is sandboxed without 'allow-scripts', abort. + if (mDocument->HasScriptsBlockedBySandbox()) { + return NS_OK; + } + + if (aRequest->IsModuleRequest()) { + // Check whether the module has been fetched or is currently being fetched, + // and if so wait for it. + nsModuleLoadRequest* request = aRequest->AsModuleRequest(); + if (ModuleMapContainsModule(request)) { + WaitForModuleFetch(request) + ->Then(AbstractThread::GetCurrent(), __func__, request, + &nsModuleLoadRequest::ModuleLoaded, + &nsModuleLoadRequest::LoadFailed); + return NS_OK; + } + + // Otherwise put the URL in the module map and mark it as fetching. + SetModuleFetchStarted(request); + } + + nsContentPolicyType contentPolicyType = aRequest->IsPreload() + ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD + : nsIContentPolicy::TYPE_INTERNAL_SCRIPT; + nsCOMPtr<nsINode> context; + if (aRequest->mElement) { + context = do_QueryInterface(aRequest->mElement); + } + else { + context = mDocument; + } + + nsCOMPtr<nsILoadGroup> loadGroup = mDocument->GetDocumentLoadGroup(); + nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->MasterDocument()->GetWindow(); + NS_ENSURE_TRUE(window, NS_ERROR_NULL_POINTER); + nsIDocShell *docshell = window->GetDocShell(); + nsCOMPtr<nsIInterfaceRequestor> prompter(do_QueryInterface(docshell)); + + nsSecurityFlags securityFlags; + // TODO: the spec currently gives module scripts different CORS behaviour to + // classic scripts. + securityFlags = aRequest->mCORSMode == CORS_NONE + ? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL + : nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS; + if (aRequest->mCORSMode == CORS_ANONYMOUS) { + securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN; + } else if (aRequest->mCORSMode == CORS_USE_CREDENTIALS) { + securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE; + } + securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME; + + nsCOMPtr<nsIChannel> channel; + nsresult rv = NS_NewChannel(getter_AddRefs(channel), + aRequest->mURI, + context, + securityFlags, + contentPolicyType, + loadGroup, + prompter, + nsIRequest::LOAD_NORMAL | + nsIChannel::LOAD_CLASSIFY_URI); + + NS_ENSURE_SUCCESS(rv, rv); + + nsIScriptElement *script = aRequest->mElement; + nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel)); + + if (cos) { + if (aScriptFromHead && + !(script && (script->GetScriptAsync() || script->GetScriptDeferred()))) { + // synchronous head scripts block lading of most other non js/css + // content such as images + cos->AddClassFlags(nsIClassOfService::Leader); + } else if (!(script && script->GetScriptDeferred())) { + // other scripts are neither blocked nor prioritized unless marked deferred + cos->AddClassFlags(nsIClassOfService::Unblocked); + } + } + + nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel)); + if (httpChannel) { + // HTTP content negotation has little value in this context. + httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"), + NS_LITERAL_CSTRING("*/*"), + false); + httpChannel->SetReferrerWithPolicy(mDocument->GetDocumentURI(), + aRequest->mReferrerPolicy); + + nsCOMPtr<nsIHttpChannelInternal> internalChannel(do_QueryInterface(httpChannel)); + if (internalChannel) { + internalChannel->SetIntegrityMetadata(aRequest->mIntegrity.GetIntegrityString()); + } + } + + nsCOMPtr<nsILoadContext> loadContext(do_QueryInterface(docshell)); + mozilla::net::PredictorLearn(aRequest->mURI, mDocument->GetDocumentURI(), + nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, loadContext); + + // Set the initiator type + nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChannel)); + if (timedChannel) { + timedChannel->SetInitiatorType(NS_LITERAL_STRING("script")); + } + + nsAutoPtr<mozilla::dom::SRICheckDataVerifier> sriDataVerifier; + if (!aRequest->mIntegrity.IsEmpty()) { + nsAutoCString sourceUri; + if (mDocument->GetDocumentURI()) { + mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + sriDataVerifier = new SRICheckDataVerifier(aRequest->mIntegrity, sourceUri, + mReporter); + } + + RefPtr<nsScriptLoadHandler> handler = + new nsScriptLoadHandler(this, aRequest, sriDataVerifier.forget()); + + nsCOMPtr<nsIIncrementalStreamLoader> loader; + rv = NS_NewIncrementalStreamLoader(getter_AddRefs(loader), handler); + NS_ENSURE_SUCCESS(rv, rv); + + return channel->AsyncOpen2(loader); +} + +bool +nsScriptLoader::PreloadURIComparator::Equals(const PreloadInfo &aPi, + nsIURI * const &aURI) const +{ + bool same; + return NS_SUCCEEDED(aPi.mRequest->mURI->Equals(aURI, &same)) && + same; +} + +class nsScriptRequestProcessor : public Runnable +{ +private: + RefPtr<nsScriptLoader> mLoader; + RefPtr<nsScriptLoadRequest> mRequest; +public: + nsScriptRequestProcessor(nsScriptLoader* aLoader, + nsScriptLoadRequest* aRequest) + : mLoader(aLoader) + , mRequest(aRequest) + {} + NS_IMETHOD Run() override + { + return mLoader->ProcessRequest(mRequest); + } +}; + +static inline bool +ParseTypeAttribute(const nsAString& aType, JSVersion* aVersion) +{ + MOZ_ASSERT(!aType.IsEmpty()); + MOZ_ASSERT(aVersion); + MOZ_ASSERT(*aVersion == JSVERSION_DEFAULT); + + nsContentTypeParser parser(aType); + + nsAutoString mimeType; + nsresult rv = parser.GetType(mimeType); + NS_ENSURE_SUCCESS(rv, false); + + if (!nsContentUtils::IsJavascriptMIMEType(mimeType)) { + return false; + } + + // Get the version string, and ensure the language supports it. + nsAutoString versionName; + rv = parser.GetParameter("version", versionName); + + if (NS_SUCCEEDED(rv)) { + *aVersion = nsContentUtils::ParseJavascriptVersion(versionName); + } else if (rv != NS_ERROR_INVALID_ARG) { + return false; + } + + return true; +} + +static bool +CSPAllowsInlineScript(nsIScriptElement *aElement, nsIDocument *aDocument) +{ + nsCOMPtr<nsIContentSecurityPolicy> csp; + // Note: For imports NodePrincipal and the principal of the master are + // the same. + nsresult rv = aDocument->NodePrincipal()->GetCsp(getter_AddRefs(csp)); + NS_ENSURE_SUCCESS(rv, false); + + if (!csp) { + // no CSP --> allow + return true; + } + + // query the nonce + nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement); + nsAutoString nonce; + scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::nonce, nonce); + bool parserCreated = aElement->GetParserCreated() != mozilla::dom::NOT_FROM_PARSER; + + // query the scripttext + nsAutoString scriptText; + aElement->GetScriptText(scriptText); + + bool allowInlineScript = false; + rv = csp->GetAllowsInline(nsIContentPolicy::TYPE_SCRIPT, + nonce, parserCreated, scriptText, + aElement->GetScriptLineNumber(), + &allowInlineScript); + return allowInlineScript; +} + +nsScriptLoadRequest* +nsScriptLoader::CreateLoadRequest(nsScriptKind aKind, + nsIScriptElement* aElement, + uint32_t aVersion, CORSMode aCORSMode, + const SRIMetadata &aIntegrity) +{ + if (aKind == nsScriptKind::Classic) { + return new nsScriptLoadRequest(aKind, aElement, aVersion, aCORSMode, + aIntegrity); + } + + MOZ_ASSERT(aKind == nsScriptKind::Module); + return new nsModuleLoadRequest(aElement, aVersion, aCORSMode, aIntegrity, + this); +} + +bool +nsScriptLoader::ProcessScriptElement(nsIScriptElement *aElement) +{ + // We need a document to evaluate scripts. + NS_ENSURE_TRUE(mDocument, false); + + // Check to see if scripts has been turned off. + if (!mEnabled || !mDocument->IsScriptEnabled()) { + return false; + } + + NS_ASSERTION(!aElement->IsMalformed(), "Executing malformed script"); + + nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement); + + // Step 12. Check that the script is not an eventhandler + if (IsScriptEventHandler(scriptContent)) { + return false; + } + + JSVersion version = JSVERSION_DEFAULT; + + // Check the type attribute to determine language and version. + // If type exists, it trumps the deprecated 'language=' + nsAutoString type; + bool hasType = aElement->GetScriptType(type); + + nsScriptKind scriptKind = nsScriptKind::Classic; + if (!type.IsEmpty()) { + // Support type="module" only for chrome documents. + if (nsContentUtils::IsChromeDoc(mDocument) && type.LowerCaseEqualsASCII("module")) { + scriptKind = nsScriptKind::Module; + } else { + NS_ENSURE_TRUE(ParseTypeAttribute(type, &version), false); + } + } else if (!hasType) { + // no 'type=' element + // "language" is a deprecated attribute of HTML, so we check it only for + // HTML script elements. + if (scriptContent->IsHTMLElement()) { + nsAutoString language; + scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language); + if (!language.IsEmpty()) { + if (!nsContentUtils::IsJavaScriptLanguage(language)) { + return false; + } + } + } + } + + // Step 14. in the HTML5 spec + nsresult rv = NS_OK; + RefPtr<nsScriptLoadRequest> request; + if (aElement->GetScriptExternal()) { + // external script + nsCOMPtr<nsIURI> scriptURI = aElement->GetScriptURI(); + if (!scriptURI) { + // Asynchronously report the failure to create a URI object + NS_DispatchToCurrentThread( + NewRunnableMethod(aElement, + &nsIScriptElement::FireErrorEvent)); + return false; + } + + // Double-check that the preload matches what we're asked to load now. + mozilla::net::ReferrerPolicy ourRefPolicy = mDocument->GetReferrerPolicy(); + CORSMode ourCORSMode = aElement->GetCORSMode(); + nsTArray<PreloadInfo>::index_type i = + mPreloads.IndexOf(scriptURI.get(), 0, PreloadURIComparator()); + if (i != nsTArray<PreloadInfo>::NoIndex) { + // preloaded + // note that a script-inserted script can steal a preload! + request = mPreloads[i].mRequest; + request->mElement = aElement; + nsString preloadCharset(mPreloads[i].mCharset); + mPreloads.RemoveElementAt(i); + + // Double-check that the charset the preload used is the same as + // the charset we have now. + nsAutoString elementCharset; + aElement->GetScriptCharset(elementCharset); + if (elementCharset.Equals(preloadCharset) && + ourCORSMode == request->mCORSMode && + ourRefPolicy == request->mReferrerPolicy && + scriptKind == request->mKind) { + rv = CheckContentPolicy(mDocument, aElement, request->mURI, type, false); + if (NS_FAILED(rv)) { + // probably plans have changed; even though the preload was allowed seems + // like the actual load is not; let's cancel the preload request. + request->Cancel(); + return false; + } + } else { + // Drop the preload + request = nullptr; + } + } + + if (!request) { + // no usable preload + + SRIMetadata sriMetadata; + { + nsAutoString integrity; + scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::integrity, + integrity); + if (!integrity.IsEmpty()) { + MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug, + ("nsScriptLoader::ProcessScriptElement, integrity=%s", + NS_ConvertUTF16toUTF8(integrity).get())); + nsAutoCString sourceUri; + if (mDocument->GetDocumentURI()) { + mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + SRICheck::IntegrityMetadata(integrity, sourceUri, mReporter, + &sriMetadata); + } + } + + request = CreateLoadRequest(scriptKind, aElement, version, ourCORSMode, + sriMetadata); + request->mURI = scriptURI; + request->mIsInline = false; + request->mReferrerPolicy = ourRefPolicy; + + // set aScriptFromHead to false so we don't treat non preloaded scripts as + // blockers for full page load. See bug 792438. + rv = StartLoad(request, type, false); + if (NS_FAILED(rv)) { + // Asynchronously report the load failure + NS_DispatchToCurrentThread( + NewRunnableMethod(aElement, + &nsIScriptElement::FireErrorEvent)); + return false; + } + } + + // Should still be in loading stage of script. + NS_ASSERTION(!request->InCompilingStage(), + "Request should not yet be in compiling stage."); + + request->mJSVersion = version; + + if (aElement->GetScriptAsync()) { + request->mIsAsync = true; + if (request->IsReadyToRun()) { + mLoadedAsyncRequests.AppendElement(request); + // The script is available already. Run it ASAP when the event + // loop gets a chance to spin. + + // KVKV TODO: Instead of processing immediately, try off-thread-parsing + // it and only schedule a pending ProcessRequest if that fails. + ProcessPendingRequestsAsync(); + } else { + mLoadingAsyncRequests.AppendElement(request); + } + return false; + } + if (!aElement->GetParserCreated() && !request->IsModuleRequest()) { + // Violate the HTML5 spec in order to make LABjs and the "order" plug-in + // for RequireJS work with their Gecko-sniffed code path. See + // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html + request->mIsNonAsyncScriptInserted = true; + mNonAsyncExternalScriptInsertedRequests.AppendElement(request); + if (request->IsReadyToRun()) { + // The script is available already. Run it ASAP when the event + // loop gets a chance to spin. + ProcessPendingRequestsAsync(); + } + return false; + } + // we now have a parser-inserted request that may or may not be still + // loading + if (aElement->GetScriptDeferred() || request->IsModuleRequest()) { + // We don't want to run this yet. + // If we come here, the script is a parser-created script and it has + // the defer attribute but not the async attribute. Since a + // a parser-inserted script is being run, we came here by the parser + // running the script, which means the parser is still alive and the + // parse is ongoing. + NS_ASSERTION(mDocument->GetCurrentContentSink() || + aElement->GetParserCreated() == FROM_PARSER_XSLT, + "Non-XSLT Defer script on a document without an active parser; bug 592366."); + AddDeferRequest(request); + return false; + } + + if (aElement->GetParserCreated() == FROM_PARSER_XSLT) { + // Need to maintain order for XSLT-inserted scripts + NS_ASSERTION(!mParserBlockingRequest, + "Parser-blocking scripts and XSLT scripts in the same doc!"); + request->mIsXSLT = true; + mXSLTRequests.AppendElement(request); + if (request->IsReadyToRun()) { + // The script is available already. Run it ASAP when the event + // loop gets a chance to spin. + ProcessPendingRequestsAsync(); + } + return true; + } + + if (request->IsReadyToRun() && ReadyToExecuteParserBlockingScripts()) { + // The request has already been loaded and there are no pending style + // sheets. If the script comes from the network stream, cheat for + // performance reasons and avoid a trip through the event loop. + if (aElement->GetParserCreated() == FROM_PARSER_NETWORK) { + return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK; + } + // Otherwise, we've got a document.written script, make a trip through + // the event loop to hide the preload effects from the scripts on the + // Web page. + NS_ASSERTION(!mParserBlockingRequest, + "There can be only one parser-blocking script at a time"); + NS_ASSERTION(mXSLTRequests.isEmpty(), + "Parser-blocking scripts and XSLT scripts in the same doc!"); + mParserBlockingRequest = request; + ProcessPendingRequestsAsync(); + return true; + } + + // The script hasn't loaded yet or there's a style sheet blocking it. + // The script will be run when it loads or the style sheet loads. + NS_ASSERTION(!mParserBlockingRequest, + "There can be only one parser-blocking script at a time"); + NS_ASSERTION(mXSLTRequests.isEmpty(), + "Parser-blocking scripts and XSLT scripts in the same doc!"); + mParserBlockingRequest = request; + return true; + } + + // inline script + // Is this document sandboxed without 'allow-scripts'? + if (mDocument->HasScriptsBlockedBySandbox()) { + return false; + } + + // Does CSP allow this inline script to run? + if (!CSPAllowsInlineScript(aElement, mDocument)) { + return false; + } + + // Inline scripts ignore ther CORS mode and are always CORS_NONE + request = CreateLoadRequest(scriptKind, aElement, version, CORS_NONE, + SRIMetadata()); // SRI doesn't apply + request->mJSVersion = version; + request->mIsInline = true; + request->mURI = mDocument->GetDocumentURI(); + request->mLineNo = aElement->GetScriptLineNumber(); + + if (request->IsModuleRequest()) { + nsModuleLoadRequest* modReq = request->AsModuleRequest(); + modReq->mBaseURL = mDocument->GetDocBaseURI(); + rv = CreateModuleScript(modReq); + NS_ENSURE_SUCCESS(rv, false); + StartFetchingModuleDependencies(modReq); + if (aElement->GetScriptAsync()) { + mLoadingAsyncRequests.AppendElement(request); + } else { + AddDeferRequest(request); + } + return false; + } + request->mProgress = nsScriptLoadRequest::Progress::Ready; + if (aElement->GetParserCreated() == FROM_PARSER_XSLT && + (!ReadyToExecuteParserBlockingScripts() || !mXSLTRequests.isEmpty())) { + // Need to maintain order for XSLT-inserted scripts + NS_ASSERTION(!mParserBlockingRequest, + "Parser-blocking scripts and XSLT scripts in the same doc!"); + mXSLTRequests.AppendElement(request); + return true; + } + if (aElement->GetParserCreated() == NOT_FROM_PARSER) { + NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(), + "A script-inserted script is inserted without an update batch?"); + nsContentUtils::AddScriptRunner(new nsScriptRequestProcessor(this, + request)); + return false; + } + if (aElement->GetParserCreated() == FROM_PARSER_NETWORK && + !ReadyToExecuteParserBlockingScripts()) { + NS_ASSERTION(!mParserBlockingRequest, + "There can be only one parser-blocking script at a time"); + mParserBlockingRequest = request; + NS_ASSERTION(mXSLTRequests.isEmpty(), + "Parser-blocking scripts and XSLT scripts in the same doc!"); + return true; + } + // We now have a document.written inline script or we have an inline script + // from the network but there is no style sheet that is blocking scripts. + // Don't check for style sheets blocking scripts in the document.write + // case to avoid style sheet network activity affecting when + // document.write returns. It's not really necessary to do this if + // there's no document.write currently on the call stack. However, + // this way matches IE more closely than checking if document.write + // is on the call stack. + NS_ASSERTION(nsContentUtils::IsSafeToRunScript(), + "Not safe to run a parser-inserted script?"); + return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK; +} + +namespace { + +class NotifyOffThreadScriptLoadCompletedRunnable : public Runnable +{ + RefPtr<nsScriptLoadRequest> mRequest; + RefPtr<nsScriptLoader> mLoader; + void *mToken; + +public: + NotifyOffThreadScriptLoadCompletedRunnable(nsScriptLoadRequest* aRequest, + nsScriptLoader* aLoader) + : mRequest(aRequest), mLoader(aLoader), mToken(nullptr) + {} + + virtual ~NotifyOffThreadScriptLoadCompletedRunnable(); + + void SetToken(void* aToken) { + MOZ_ASSERT(aToken && !mToken); + mToken = aToken; + } + + NS_DECL_NSIRUNNABLE +}; + +} /* anonymous namespace */ + +nsresult +nsScriptLoader::ProcessOffThreadRequest(nsScriptLoadRequest* aRequest) +{ + MOZ_ASSERT(aRequest->mProgress == nsScriptLoadRequest::Progress::Compiling); + MOZ_ASSERT(!aRequest->mWasCompiledOMT); + + aRequest->mWasCompiledOMT = true; + + if (aRequest->IsModuleRequest()) { + MOZ_ASSERT(aRequest->mOffThreadToken); + nsModuleLoadRequest* request = aRequest->AsModuleRequest(); + nsresult rv = ProcessFetchedModuleSource(request); + if (NS_FAILED(rv)) { + request->LoadFailed(); + } + return rv; + } + + aRequest->SetReady(); + + if (aRequest == mParserBlockingRequest) { + if (!ReadyToExecuteParserBlockingScripts()) { + // If not ready to execute scripts, schedule an async call to + // ProcessPendingRequests to handle it. + ProcessPendingRequestsAsync(); + return NS_OK; + } + + // Same logic as in top of ProcessPendingRequests. + mParserBlockingRequest = nullptr; + UnblockParser(aRequest); + ProcessRequest(aRequest); + mDocument->UnblockOnload(false); + ContinueParserAsync(aRequest); + return NS_OK; + } + + nsresult rv = ProcessRequest(aRequest); + mDocument->UnblockOnload(false); + return rv; +} + +NotifyOffThreadScriptLoadCompletedRunnable::~NotifyOffThreadScriptLoadCompletedRunnable() +{ + if (MOZ_UNLIKELY(mRequest || mLoader) && !NS_IsMainThread()) { + NS_ReleaseOnMainThread(mRequest.forget()); + NS_ReleaseOnMainThread(mLoader.forget()); + } +} + +NS_IMETHODIMP +NotifyOffThreadScriptLoadCompletedRunnable::Run() +{ + MOZ_ASSERT(NS_IsMainThread()); + + // We want these to be dropped on the main thread, once we return from this + // function. + RefPtr<nsScriptLoadRequest> request = mRequest.forget(); + RefPtr<nsScriptLoader> loader = mLoader.forget(); + + request->mOffThreadToken = mToken; + nsresult rv = loader->ProcessOffThreadRequest(request); + + return rv; +} + +static void +OffThreadScriptLoaderCallback(void *aToken, void *aCallbackData) +{ + RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> aRunnable = + dont_AddRef(static_cast<NotifyOffThreadScriptLoadCompletedRunnable*>(aCallbackData)); + aRunnable->SetToken(aToken); + NS_DispatchToMainThread(aRunnable); +} + +nsresult +nsScriptLoader::AttemptAsyncScriptCompile(nsScriptLoadRequest* aRequest) +{ + MOZ_ASSERT_IF(!aRequest->IsModuleRequest(), aRequest->IsReadyToRun()); + MOZ_ASSERT(!aRequest->mWasCompiledOMT); + + // Don't off-thread compile inline scripts. + if (aRequest->mIsInline) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject(); + if (!globalObject) { + return NS_ERROR_FAILURE; + } + + AutoJSAPI jsapi; + if (!jsapi.Init(globalObject)) { + return NS_ERROR_FAILURE; + } + + JSContext* cx = jsapi.cx(); + JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject()); + JS::CompileOptions options(cx); + + nsresult rv = FillCompileOptionsForRequest(jsapi, aRequest, global, &options); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + if (!JS::CanCompileOffThread(cx, options, aRequest->mScriptTextLength)) { + return NS_ERROR_FAILURE; + } + + RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> runnable = + new NotifyOffThreadScriptLoadCompletedRunnable(aRequest, this); + + if (aRequest->IsModuleRequest()) { + if (!JS::CompileOffThreadModule(cx, options, + aRequest->mScriptTextBuf, aRequest->mScriptTextLength, + OffThreadScriptLoaderCallback, + static_cast<void*>(runnable))) { + return NS_ERROR_OUT_OF_MEMORY; + } + } else { + if (!JS::CompileOffThread(cx, options, + aRequest->mScriptTextBuf, aRequest->mScriptTextLength, + OffThreadScriptLoaderCallback, + static_cast<void*>(runnable))) { + return NS_ERROR_OUT_OF_MEMORY; + } + } + + mDocument->BlockOnload(); + aRequest->mProgress = nsScriptLoadRequest::Progress::Compiling; + + Unused << runnable.forget(); + return NS_OK; +} + +nsresult +nsScriptLoader::CompileOffThreadOrProcessRequest(nsScriptLoadRequest* aRequest) +{ + NS_ASSERTION(nsContentUtils::IsSafeToRunScript(), + "Processing requests when running scripts is unsafe."); + NS_ASSERTION(!aRequest->mOffThreadToken, + "Candidate for off-thread compile is already parsed off-thread"); + NS_ASSERTION(!aRequest->InCompilingStage(), + "Candidate for off-thread compile is already in compiling stage."); + + nsresult rv = AttemptAsyncScriptCompile(aRequest); + if (NS_SUCCEEDED(rv)) { + return rv; + } + + return ProcessRequest(aRequest); +} + +SourceBufferHolder +nsScriptLoader::GetScriptSource(nsScriptLoadRequest* aRequest, nsAutoString& inlineData) +{ + // Return a SourceBufferHolder object holding the script's source text. + // |inlineData| is used to hold the text for inline objects. + + // If there's no script text, we try to get it from the element + if (aRequest->mIsInline) { + // XXX This is inefficient - GetText makes multiple + // copies. + aRequest->mElement->GetScriptText(inlineData); + return SourceBufferHolder(inlineData.get(), + inlineData.Length(), + SourceBufferHolder::NoOwnership); + } + + return SourceBufferHolder(aRequest->mScriptTextBuf, + aRequest->mScriptTextLength, + SourceBufferHolder::NoOwnership); +} + +nsresult +nsScriptLoader::ProcessRequest(nsScriptLoadRequest* aRequest) +{ + NS_ASSERTION(nsContentUtils::IsSafeToRunScript(), + "Processing requests when running scripts is unsafe."); + NS_ASSERTION(aRequest->IsReadyToRun(), + "Processing a request that is not ready to run."); + + NS_ENSURE_ARG(aRequest); + + if (aRequest->IsModuleRequest() && + !aRequest->AsModuleRequest()->mModuleScript) + { + // There was an error parsing a module script. Nothing to do here. + FireScriptAvailable(NS_ERROR_FAILURE, aRequest); + return NS_OK; + } + + nsCOMPtr<nsINode> scriptElem = do_QueryInterface(aRequest->mElement); + + nsCOMPtr<nsIDocument> doc; + if (!aRequest->mIsInline) { + doc = scriptElem->OwnerDoc(); + } + + nsCOMPtr<nsIScriptElement> oldParserInsertedScript; + uint32_t parserCreated = aRequest->mElement->GetParserCreated(); + if (parserCreated) { + oldParserInsertedScript = mCurrentParserInsertedScript; + mCurrentParserInsertedScript = aRequest->mElement; + } + + aRequest->mElement->BeginEvaluating(); + + FireScriptAvailable(NS_OK, aRequest); + + // The window may have gone away by this point, in which case there's no point + // in trying to run the script. + nsCOMPtr<nsIDocument> master = mDocument->MasterDocument(); + { + // Try to perform a microtask checkpoint + nsAutoMicroTask mt; + } + + nsPIDOMWindowInner *pwin = master->GetInnerWindow(); + bool runScript = !!pwin; + if (runScript) { + nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(), + scriptElem, + NS_LITERAL_STRING("beforescriptexecute"), + true, true, &runScript); + } + + // Inner window could have gone away after firing beforescriptexecute + pwin = master->GetInnerWindow(); + if (!pwin) { + runScript = false; + } + + nsresult rv = NS_OK; + if (runScript) { + if (doc) { + doc->BeginEvaluatingExternalScript(); + } + rv = EvaluateScript(aRequest); + if (doc) { + doc->EndEvaluatingExternalScript(); + } + + nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(), + scriptElem, + NS_LITERAL_STRING("afterscriptexecute"), + true, false); + } + + FireScriptEvaluated(rv, aRequest); + + aRequest->mElement->EndEvaluating(); + + if (parserCreated) { + mCurrentParserInsertedScript = oldParserInsertedScript; + } + + if (aRequest->mOffThreadToken) { + // The request was parsed off-main-thread, but the result of the off + // thread parse was not actually needed to process the request + // (disappearing window, some other error, ...). Finish the + // request to avoid leaks in the JS engine. + MOZ_ASSERT(!aRequest->IsModuleRequest()); + aRequest->MaybeCancelOffThreadScript(); + } + + // Free any source data. + free(aRequest->mScriptTextBuf); + aRequest->mScriptTextBuf = nullptr; + aRequest->mScriptTextLength = 0; + + return rv; +} + +void +nsScriptLoader::FireScriptAvailable(nsresult aResult, + nsScriptLoadRequest* aRequest) +{ + for (int32_t i = 0; i < mObservers.Count(); i++) { + nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i]; + obs->ScriptAvailable(aResult, aRequest->mElement, + aRequest->mIsInline, aRequest->mURI, + aRequest->mLineNo); + } + + aRequest->FireScriptAvailable(aResult); +} + +void +nsScriptLoader::FireScriptEvaluated(nsresult aResult, + nsScriptLoadRequest* aRequest) +{ + for (int32_t i = 0; i < mObservers.Count(); i++) { + nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i]; + obs->ScriptEvaluated(aResult, aRequest->mElement, + aRequest->mIsInline); + } + + aRequest->FireScriptEvaluated(aResult); +} + +already_AddRefed<nsIScriptGlobalObject> +nsScriptLoader::GetScriptGlobalObject() +{ + nsCOMPtr<nsIDocument> master = mDocument->MasterDocument(); + nsPIDOMWindowInner *pwin = master->GetInnerWindow(); + if (!pwin) { + return nullptr; + } + + nsCOMPtr<nsIScriptGlobalObject> globalObject = do_QueryInterface(pwin); + NS_ASSERTION(globalObject, "windows must be global objects"); + + // and make sure we are setup for this type of script. + nsresult rv = globalObject->EnsureScriptEnvironment(); + if (NS_FAILED(rv)) { + return nullptr; + } + + return globalObject.forget(); +} + +nsresult +nsScriptLoader::FillCompileOptionsForRequest(const AutoJSAPI&jsapi, + nsScriptLoadRequest* aRequest, + JS::Handle<JSObject*> aScopeChain, + JS::CompileOptions* aOptions) +{ + // It's very important to use aRequest->mURI, not the final URI of the channel + // aRequest ended up getting script data from, as the script filename. + nsresult rv; + nsContentUtils::GetWrapperSafeScriptFilename(mDocument, aRequest->mURI, + aRequest->mURL, &rv); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + bool isScriptElement = !aRequest->IsModuleRequest() || + aRequest->AsModuleRequest()->IsTopLevel(); + aOptions->setIntroductionType(isScriptElement ? "scriptElement" + : "importedModule"); + aOptions->setFileAndLine(aRequest->mURL.get(), aRequest->mLineNo); + aOptions->setVersion(JSVersion(aRequest->mJSVersion)); + aOptions->setIsRunOnce(true); + // We only need the setNoScriptRval bit when compiling off-thread here, since + // otherwise nsJSUtils::EvaluateString will set it up for us. + aOptions->setNoScriptRval(true); + if (aRequest->mHasSourceMapURL) { + aOptions->setSourceMapURL(aRequest->mSourceMapURL.get()); + } + if (aRequest->mOriginPrincipal) { + nsIPrincipal* scriptPrin = nsContentUtils::ObjectPrincipal(aScopeChain); + bool subsumes = scriptPrin->Subsumes(aRequest->mOriginPrincipal); + aOptions->setMutedErrors(!subsumes); + } + + JSContext* cx = jsapi.cx(); + JS::Rooted<JS::Value> elementVal(cx); + MOZ_ASSERT(aRequest->mElement); + if (NS_SUCCEEDED(nsContentUtils::WrapNative(cx, aRequest->mElement, + &elementVal, + /* aAllowWrapping = */ true))) { + MOZ_ASSERT(elementVal.isObject()); + aOptions->setElement(&elementVal.toObject()); + } + + return NS_OK; +} + +nsresult +nsScriptLoader::EvaluateScript(nsScriptLoadRequest* aRequest) +{ + // We need a document to evaluate scripts. + if (!mDocument) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIContent> scriptContent(do_QueryInterface(aRequest->mElement)); + nsIDocument* ownerDoc = scriptContent->OwnerDoc(); + if (ownerDoc != mDocument) { + // Willful violation of HTML5 as of 2010-12-01 + return NS_ERROR_FAILURE; + } + + // Get the script-type to be used by this element. + NS_ASSERTION(scriptContent, "no content - what is default script-type?"); + + nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject(); + if (!globalObject) { + return NS_ERROR_FAILURE; + } + + // Make sure context is a strong reference since we access it after + // we've executed a script, which may cause all other references to + // the context to go away. + nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext(); + if (!context) { + return NS_ERROR_FAILURE; + } + + JSVersion version = JSVersion(aRequest->mJSVersion); + if (version == JSVERSION_UNKNOWN) { + return NS_OK; + } + + // New script entry point required, due to the "Create a script" sub-step of + // http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block + nsAutoMicroTask mt; + AutoEntryScript aes(globalObject, "<script> element", true); + JS::Rooted<JSObject*> global(aes.cx(), + globalObject->GetGlobalJSObject()); + + bool oldProcessingScriptTag = context->GetProcessingScriptTag(); + context->SetProcessingScriptTag(true); + nsresult rv; + { + // Update our current script. + AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement); + Maybe<AutoCurrentScriptUpdater> masterScriptUpdater; + nsCOMPtr<nsIDocument> master = mDocument->MasterDocument(); + if (master != mDocument) { + // If this script belongs to an import document, it will be + // executed in the context of the master document. During the + // execution currentScript of the master should refer to this + // script. So let's update the mCurrentScript of the ScriptLoader + // of the master document too. + masterScriptUpdater.emplace(master->ScriptLoader(), + aRequest->mElement); + } + + if (aRequest->IsModuleRequest()) { + nsModuleLoadRequest* request = aRequest->AsModuleRequest(); + MOZ_ASSERT(request->mModuleScript); + MOZ_ASSERT(!request->mOffThreadToken); + nsModuleScript* ms = request->mModuleScript; + MOZ_ASSERT(!ms->IsUninstantiated()); + if (ms->InstantiationFailed()) { + JS::Rooted<JS::Value> exception(aes.cx(), ms->Exception()); + JS_SetPendingException(aes.cx(), exception); + rv = NS_ERROR_FAILURE; + } else { + JS::Rooted<JSObject*> module(aes.cx(), ms->ModuleRecord()); + MOZ_ASSERT(module); + rv = nsJSUtils::ModuleEvaluation(aes.cx(), module); + } + } else { + JS::CompileOptions options(aes.cx()); + rv = FillCompileOptionsForRequest(aes, aRequest, global, &options); + + if (NS_SUCCEEDED(rv)) { + nsAutoString inlineData; + SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData); + rv = nsJSUtils::EvaluateString(aes.cx(), srcBuf, global, options, + aRequest->OffThreadTokenPtr()); + } + } + } + + context->SetProcessingScriptTag(oldProcessingScriptTag); + return rv; +} + +void +nsScriptLoader::ProcessPendingRequestsAsync() +{ + if (mParserBlockingRequest || + !mXSLTRequests.isEmpty() || + !mLoadedAsyncRequests.isEmpty() || + !mNonAsyncExternalScriptInsertedRequests.isEmpty() || + !mDeferRequests.isEmpty() || + !mPendingChildLoaders.IsEmpty()) { + NS_DispatchToCurrentThread(NewRunnableMethod(this, + &nsScriptLoader::ProcessPendingRequests)); + } +} + +void +nsScriptLoader::ProcessPendingRequests() +{ + RefPtr<nsScriptLoadRequest> request; + + if (mParserBlockingRequest && + mParserBlockingRequest->IsReadyToRun() && + ReadyToExecuteParserBlockingScripts()) { + request.swap(mParserBlockingRequest); + UnblockParser(request); + ProcessRequest(request); + if (request->mWasCompiledOMT) { + mDocument->UnblockOnload(false); + } + ContinueParserAsync(request); + } + + while (ReadyToExecuteParserBlockingScripts() && + !mXSLTRequests.isEmpty() && + mXSLTRequests.getFirst()->IsReadyToRun()) { + request = mXSLTRequests.StealFirst(); + ProcessRequest(request); + } + + while (ReadyToExecuteScripts() && !mLoadedAsyncRequests.isEmpty()) { + request = mLoadedAsyncRequests.StealFirst(); + if (request->IsModuleRequest()) { + ProcessRequest(request); + } else { + CompileOffThreadOrProcessRequest(request); + } + } + + while (ReadyToExecuteScripts() && + !mNonAsyncExternalScriptInsertedRequests.isEmpty() && + mNonAsyncExternalScriptInsertedRequests.getFirst()->IsReadyToRun()) { + // Violate the HTML5 spec and execute these in the insertion order in + // order to make LABjs and the "order" plug-in for RequireJS work with + // their Gecko-sniffed code path. See + // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html + request = mNonAsyncExternalScriptInsertedRequests.StealFirst(); + ProcessRequest(request); + } + + if (mDocumentParsingDone && mXSLTRequests.isEmpty()) { + while (ReadyToExecuteScripts() && + !mDeferRequests.isEmpty() && + mDeferRequests.getFirst()->IsReadyToRun()) { + request = mDeferRequests.StealFirst(); + ProcessRequest(request); + } + } + + while (!mPendingChildLoaders.IsEmpty() && + ReadyToExecuteParserBlockingScripts()) { + RefPtr<nsScriptLoader> child = mPendingChildLoaders[0]; + mPendingChildLoaders.RemoveElementAt(0); + child->RemoveParserBlockingScriptExecutionBlocker(); + } + + if (mDocumentParsingDone && mDocument && !mParserBlockingRequest && + mNonAsyncExternalScriptInsertedRequests.isEmpty() && + mXSLTRequests.isEmpty() && mDeferRequests.isEmpty() && + MaybeRemovedDeferRequests()) { + return ProcessPendingRequests(); + } + + if (mDocumentParsingDone && mDocument && + !mParserBlockingRequest && mLoadingAsyncRequests.isEmpty() && + mLoadedAsyncRequests.isEmpty() && + mNonAsyncExternalScriptInsertedRequests.isEmpty() && + mXSLTRequests.isEmpty() && mDeferRequests.isEmpty()) { + // No more pending scripts; time to unblock onload. + // OK to unblock onload synchronously here, since callers must be + // prepared for the world changing anyway. + mDocumentParsingDone = false; + mDocument->UnblockOnload(true); + } +} + +bool +nsScriptLoader::ReadyToExecuteParserBlockingScripts() +{ + // Make sure the SelfReadyToExecuteParserBlockingScripts check is first, so + // that we don't block twice on an ancestor. + if (!SelfReadyToExecuteParserBlockingScripts()) { + return false; + } + + for (nsIDocument* doc = mDocument; doc; doc = doc->GetParentDocument()) { + nsScriptLoader* ancestor = doc->ScriptLoader(); + if (!ancestor->SelfReadyToExecuteParserBlockingScripts() && + ancestor->AddPendingChildLoader(this)) { + AddParserBlockingScriptExecutionBlocker(); + return false; + } + } + + if (mDocument && !mDocument->IsMasterDocument()) { + RefPtr<ImportManager> im = mDocument->ImportManager(); + RefPtr<ImportLoader> loader = im->Find(mDocument); + MOZ_ASSERT(loader, "How can we have an import document without a loader?"); + + // The referring link that counts in the execution order calculation + // (in spec: flagged as branch) + nsCOMPtr<nsINode> referrer = loader->GetMainReferrer(); + MOZ_ASSERT(referrer, "There has to be a main referring link for each imports"); + + // Import documents are blocked by their import predecessors. We need to + // wait with script execution until all the predecessors are done. + // Technically it means we have to wait for the last one to finish, + // which is the neares one to us in the order. + RefPtr<ImportLoader> lastPred = im->GetNearestPredecessor(referrer); + if (!lastPred) { + // If there is no predecessor we can run. + return true; + } + + nsCOMPtr<nsIDocument> doc = lastPred->GetDocument(); + if (lastPred->IsBlocking() || !doc || + !doc->ScriptLoader()->SelfReadyToExecuteParserBlockingScripts()) { + // Document has not been created yet or it was created but not ready. + // Either case we are blocked by it. The ImportLoader will take care + // of blocking us, and adding the pending child loader to the blocking + // ScriptLoader when it's possible (at this point the blocking loader + // might not have created the document/ScriptLoader) + lastPred->AddBlockedScriptLoader(this); + // As more imports are parsed, this can change, let's cache what we + // blocked, so it can be later updated if needed (see: ImportLoader::Updater). + loader->SetBlockingPredecessor(lastPred); + return false; + } + } + + return true; +} + +/* static */ nsresult +nsScriptLoader::ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData, + uint32_t aLength, const nsAString& aHintCharset, + nsIDocument* aDocument, + char16_t*& aBufOut, size_t& aLengthOut) +{ + if (!aLength) { + aBufOut = nullptr; + aLengthOut = 0; + return NS_OK; + } + + // The encoding info precedence is as follows from high to low: + // The BOM + // HTTP Content-Type (if name recognized) + // charset attribute (if name recognized) + // The encoding of the document + + nsAutoCString charset; + + nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder; + + if (nsContentUtils::CheckForBOM(aData, aLength, charset)) { + // charset is now one of "UTF-16BE", "UTF-16BE" or "UTF-8". Those decoder + // will take care of swallowing the BOM. + unicodeDecoder = EncodingUtils::DecoderForEncoding(charset); + } + + if (!unicodeDecoder && + aChannel && + NS_SUCCEEDED(aChannel->GetContentCharset(charset)) && + EncodingUtils::FindEncodingForLabel(charset, charset)) { + unicodeDecoder = EncodingUtils::DecoderForEncoding(charset); + } + + if (!unicodeDecoder && + EncodingUtils::FindEncodingForLabel(aHintCharset, charset)) { + unicodeDecoder = EncodingUtils::DecoderForEncoding(charset); + } + + if (!unicodeDecoder && aDocument) { + charset = aDocument->GetDocumentCharacterSet(); + unicodeDecoder = EncodingUtils::DecoderForEncoding(charset); + } + + if (!unicodeDecoder) { + // Curiously, there are various callers that don't pass aDocument. The + // fallback in the old code was ISO-8859-1, which behaved like + // windows-1252. Saying windows-1252 for clarity and for compliance + // with the Encoding Standard. + unicodeDecoder = EncodingUtils::DecoderForEncoding("windows-1252"); + } + + int32_t unicodeLength = 0; + + nsresult rv = + unicodeDecoder->GetMaxLength(reinterpret_cast<const char*>(aData), + aLength, &unicodeLength); + NS_ENSURE_SUCCESS(rv, rv); + + aBufOut = static_cast<char16_t*>(js_malloc(unicodeLength * sizeof(char16_t))); + if (!aBufOut) { + aLengthOut = 0; + return NS_ERROR_OUT_OF_MEMORY; + } + aLengthOut = unicodeLength; + + rv = unicodeDecoder->Convert(reinterpret_cast<const char*>(aData), + (int32_t *) &aLength, aBufOut, + &unicodeLength); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + aLengthOut = unicodeLength; + if (NS_FAILED(rv)) { + js_free(aBufOut); + aBufOut = nullptr; + aLengthOut = 0; + } + return rv; +} + +nsresult +nsScriptLoader::OnStreamComplete(nsIIncrementalStreamLoader* aLoader, + nsISupports* aContext, + nsresult aChannelStatus, + nsresult aSRIStatus, + mozilla::Vector<char16_t> &aString, + mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier) +{ + nsScriptLoadRequest* request = static_cast<nsScriptLoadRequest*>(aContext); + NS_ASSERTION(request, "null request in stream complete handler"); + NS_ENSURE_TRUE(request, NS_ERROR_FAILURE); + + nsCOMPtr<nsIRequest> channelRequest; + aLoader->GetRequest(getter_AddRefs(channelRequest)); + nsCOMPtr<nsIChannel> channel; + channel = do_QueryInterface(channelRequest); + + nsresult rv = NS_OK; + if (!request->mIntegrity.IsEmpty() && + NS_SUCCEEDED((rv = aSRIStatus))) { + MOZ_ASSERT(aSRIDataVerifier); + MOZ_ASSERT(mReporter); + + nsAutoCString sourceUri; + if (mDocument && mDocument->GetDocumentURI()) { + mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + rv = aSRIDataVerifier->Verify(request->mIntegrity, channel, sourceUri, + mReporter); + mReporter->FlushConsoleReports(mDocument); + if (NS_FAILED(rv)) { + rv = NS_ERROR_SRI_CORRUPT; + } + } else { + nsCOMPtr<nsILoadInfo> loadInfo = channel->GetLoadInfo(); + + if (loadInfo->GetEnforceSRI()) { + MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug, + ("nsScriptLoader::OnStreamComplete, required SRI not found")); + nsCOMPtr<nsIContentSecurityPolicy> csp; + loadInfo->LoadingPrincipal()->GetCsp(getter_AddRefs(csp)); + nsAutoCString violationURISpec; + mDocument->GetDocumentURI()->GetAsciiSpec(violationURISpec); + uint32_t lineNo = request->mElement ? request->mElement->GetScriptLineNumber() : 0; + csp->LogViolationDetails( + nsIContentSecurityPolicy::VIOLATION_TYPE_REQUIRE_SRI_FOR_SCRIPT, + NS_ConvertUTF8toUTF16(violationURISpec), + EmptyString(), lineNo, EmptyString(), EmptyString()); + rv = NS_ERROR_SRI_CORRUPT; + } + } + + if (NS_SUCCEEDED(rv)) { + rv = PrepareLoadedRequest(request, aLoader, aChannelStatus, aString); + } + + if (NS_FAILED(rv)) { + /* + * Handle script not loading error because source was a tracking URL. + * We make a note of this script node by including it in a dedicated + * array of blocked tracking nodes under its parent document. + */ + if (rv == NS_ERROR_TRACKING_URI) { + nsCOMPtr<nsIContent> cont = do_QueryInterface(request->mElement); + mDocument->AddBlockedTrackingNode(cont); + } + + if (request->mIsDefer) { + MOZ_ASSERT_IF(request->IsModuleRequest(), + request->AsModuleRequest()->IsTopLevel()); + if (request->isInList()) { + RefPtr<nsScriptLoadRequest> req = mDeferRequests.Steal(request); + FireScriptAvailable(rv, req); + } + } else if (request->mIsAsync) { + MOZ_ASSERT_IF(request->IsModuleRequest(), + request->AsModuleRequest()->IsTopLevel()); + if (request->isInList()) { + RefPtr<nsScriptLoadRequest> req = mLoadingAsyncRequests.Steal(request); + FireScriptAvailable(rv, req); + } + } else if (request->mIsNonAsyncScriptInserted) { + if (request->isInList()) { + RefPtr<nsScriptLoadRequest> req = + mNonAsyncExternalScriptInsertedRequests.Steal(request); + FireScriptAvailable(rv, req); + } + } else if (request->mIsXSLT) { + if (request->isInList()) { + RefPtr<nsScriptLoadRequest> req = mXSLTRequests.Steal(request); + FireScriptAvailable(rv, req); + } + } else if (request->IsModuleRequest()) { + nsModuleLoadRequest* modReq = request->AsModuleRequest(); + MOZ_ASSERT(!modReq->IsTopLevel()); + MOZ_ASSERT(!modReq->isInList()); + modReq->Cancel(); + FireScriptAvailable(rv, request); + } else if (mParserBlockingRequest == request) { + MOZ_ASSERT(!request->isInList()); + mParserBlockingRequest = nullptr; + UnblockParser(request); + + // Ensure that we treat request->mElement as our current parser-inserted + // script while firing onerror on it. + MOZ_ASSERT(request->mElement->GetParserCreated()); + nsCOMPtr<nsIScriptElement> oldParserInsertedScript = + mCurrentParserInsertedScript; + mCurrentParserInsertedScript = request->mElement; + FireScriptAvailable(rv, request); + ContinueParserAsync(request); + mCurrentParserInsertedScript = oldParserInsertedScript; + } else { + mPreloads.RemoveElement(request, PreloadRequestComparator()); + } + } + + // Process our request and/or any pending ones + ProcessPendingRequests(); + + return NS_OK; +} + +void +nsScriptLoader::UnblockParser(nsScriptLoadRequest* aParserBlockingRequest) +{ + aParserBlockingRequest->mElement->UnblockParser(); +} + +void +nsScriptLoader::ContinueParserAsync(nsScriptLoadRequest* aParserBlockingRequest) +{ + aParserBlockingRequest->mElement->ContinueParserAsync(); +} + +uint32_t +nsScriptLoader::NumberOfProcessors() +{ + if (mNumberOfProcessors > 0) + return mNumberOfProcessors; + + int32_t numProcs = PR_GetNumberOfProcessors(); + if (numProcs > 0) + mNumberOfProcessors = numProcs; + return mNumberOfProcessors; +} + +void +nsScriptLoader::MaybeMoveToLoadedList(nsScriptLoadRequest* aRequest) +{ + MOZ_ASSERT(aRequest->IsReadyToRun()); + + // If it's async, move it to the loaded list. aRequest->mIsAsync really + // _should_ be in a list, but the consequences if it's not are bad enough we + // want to avoid trying to move it if it's not. + if (aRequest->mIsAsync) { + MOZ_ASSERT(aRequest->isInList()); + if (aRequest->isInList()) { + RefPtr<nsScriptLoadRequest> req = mLoadingAsyncRequests.Steal(aRequest); + mLoadedAsyncRequests.AppendElement(req); + } + } +} + +nsresult +nsScriptLoader::PrepareLoadedRequest(nsScriptLoadRequest* aRequest, + nsIIncrementalStreamLoader* aLoader, + nsresult aStatus, + mozilla::Vector<char16_t> &aString) +{ + if (NS_FAILED(aStatus)) { + return aStatus; + } + + if (aRequest->IsCanceled()) { + return NS_BINDING_ABORTED; + } + + // If we don't have a document, then we need to abort further + // evaluation. + if (!mDocument) { + return NS_ERROR_NOT_AVAILABLE; + } + + // If the load returned an error page, then we need to abort + nsCOMPtr<nsIRequest> req; + nsresult rv = aLoader->GetRequest(getter_AddRefs(req)); + NS_ASSERTION(req, "StreamLoader's request went away prematurely"); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(req); + if (httpChannel) { + bool requestSucceeded; + rv = httpChannel->GetRequestSucceeded(&requestSucceeded); + if (NS_SUCCEEDED(rv) && !requestSucceeded) { + return NS_ERROR_NOT_AVAILABLE; + } + + nsAutoCString sourceMapURL; + rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("X-SourceMap"), sourceMapURL); + if (NS_SUCCEEDED(rv)) { + aRequest->mHasSourceMapURL = true; + aRequest->mSourceMapURL = NS_ConvertUTF8toUTF16(sourceMapURL); + } + } + + nsCOMPtr<nsIChannel> channel = do_QueryInterface(req); + // If this load was subject to a CORS check; don't flag it with a + // separate origin principal, so that it will treat our document's + // principal as the origin principal + if (aRequest->mCORSMode == CORS_NONE) { + rv = nsContentUtils::GetSecurityManager()-> + GetChannelResultPrincipal(channel, getter_AddRefs(aRequest->mOriginPrincipal)); + NS_ENSURE_SUCCESS(rv, rv); + } + + if (!aString.empty()) { + aRequest->mScriptTextLength = aString.length(); + aRequest->mScriptTextBuf = aString.extractOrCopyRawBuffer(); + } + + // This assertion could fire errorously if we ran out of memory when + // inserting the request in the array. However it's an unlikely case + // so if you see this assertion it is likely something else that is + // wrong, especially if you see it more than once. + NS_ASSERTION(mDeferRequests.Contains(aRequest) || + mLoadingAsyncRequests.Contains(aRequest) || + mNonAsyncExternalScriptInsertedRequests.Contains(aRequest) || + mXSLTRequests.Contains(aRequest) || + (aRequest->IsModuleRequest() && + !aRequest->AsModuleRequest()->IsTopLevel() && + !aRequest->isInList()) || + mPreloads.Contains(aRequest, PreloadRequestComparator()) || + mParserBlockingRequest, + "aRequest should be pending!"); + + if (aRequest->IsModuleRequest()) { + nsModuleLoadRequest* request = aRequest->AsModuleRequest(); + + // When loading a module, only responses with a JavaScript MIME type are + // acceptable. + nsAutoCString mimeType; + channel->GetContentType(mimeType); + NS_ConvertUTF8toUTF16 typeString(mimeType); + if (!nsContentUtils::IsJavascriptMIMEType(typeString)) { + return NS_ERROR_FAILURE; + } + + channel->GetURI(getter_AddRefs(request->mBaseURL)); + + // Attempt to compile off main thread. + rv = AttemptAsyncScriptCompile(request); + if (NS_SUCCEEDED(rv)) { + return rv; + } + + // Otherwise compile it right away and start fetching descendents. + return ProcessFetchedModuleSource(request); + } + + // The script is now loaded and ready to run. + aRequest->SetReady(); + + // If this is currently blocking the parser, attempt to compile it off-main-thread. + if (aRequest == mParserBlockingRequest && (NumberOfProcessors() > 1)) { + MOZ_ASSERT(!aRequest->IsModuleRequest()); + nsresult rv = AttemptAsyncScriptCompile(aRequest); + if (rv == NS_OK) { + MOZ_ASSERT(aRequest->mProgress == nsScriptLoadRequest::Progress::Compiling, + "Request should be off-thread compiling now."); + return NS_OK; + } + + // If off-thread compile errored, return the error. + if (rv != NS_ERROR_FAILURE) { + return rv; + } + + // If off-thread compile was rejected, continue with regular processing. + } + + MaybeMoveToLoadedList(aRequest); + + return NS_OK; +} + +void +nsScriptLoader::ParsingComplete(bool aTerminated) +{ + if (mDeferEnabled) { + // Have to check because we apparently get ParsingComplete + // without BeginDeferringScripts in some cases + mDocumentParsingDone = true; + } + mDeferEnabled = false; + if (aTerminated) { + mDeferRequests.Clear(); + mLoadingAsyncRequests.Clear(); + mLoadedAsyncRequests.Clear(); + mNonAsyncExternalScriptInsertedRequests.Clear(); + mXSLTRequests.Clear(); + if (mParserBlockingRequest) { + mParserBlockingRequest->Cancel(); + mParserBlockingRequest = nullptr; + } + } + + // Have to call this even if aTerminated so we'll correctly unblock + // onload and all. + ProcessPendingRequests(); +} + +void +nsScriptLoader::PreloadURI(nsIURI *aURI, const nsAString &aCharset, + const nsAString &aType, + const nsAString &aCrossOrigin, + const nsAString& aIntegrity, + bool aScriptFromHead, + const mozilla::net::ReferrerPolicy aReferrerPolicy) +{ + NS_ENSURE_TRUE_VOID(mDocument); + // Check to see if scripts has been turned off. + if (!mEnabled || !mDocument->IsScriptEnabled()) { + return; + } + + // TODO: Preload module scripts. + if (nsContentUtils::IsChromeDoc(mDocument) && aType.LowerCaseEqualsASCII("module")) { + return; + } + + SRIMetadata sriMetadata; + if (!aIntegrity.IsEmpty()) { + MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug, + ("nsScriptLoader::PreloadURI, integrity=%s", + NS_ConvertUTF16toUTF8(aIntegrity).get())); + nsAutoCString sourceUri; + if (mDocument->GetDocumentURI()) { + mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + SRICheck::IntegrityMetadata(aIntegrity, sourceUri, mReporter, &sriMetadata); + } + + RefPtr<nsScriptLoadRequest> request = + CreateLoadRequest(nsScriptKind::Classic, nullptr, 0, + Element::StringToCORSMode(aCrossOrigin), sriMetadata); + request->mURI = aURI; + request->mIsInline = false; + request->mReferrerPolicy = aReferrerPolicy; + + nsresult rv = StartLoad(request, aType, aScriptFromHead); + if (NS_FAILED(rv)) { + return; + } + + PreloadInfo *pi = mPreloads.AppendElement(); + pi->mRequest = request; + pi->mCharset = aCharset; +} + +void +nsScriptLoader::AddDeferRequest(nsScriptLoadRequest* aRequest) +{ + aRequest->mIsDefer = true; + mDeferRequests.AppendElement(aRequest); + if (mDeferEnabled && aRequest == mDeferRequests.getFirst() && + mDocument && !mBlockingDOMContentLoaded) { + MOZ_ASSERT(mDocument->GetReadyStateEnum() == nsIDocument::READYSTATE_LOADING); + mBlockingDOMContentLoaded = true; + mDocument->BlockDOMContentLoaded(); + } +} + +bool +nsScriptLoader::MaybeRemovedDeferRequests() +{ + if (mDeferRequests.isEmpty() && mDocument && + mBlockingDOMContentLoaded) { + mBlockingDOMContentLoaded = false; + mDocument->UnblockDOMContentLoaded(); + return true; + } + return false; +} + +////////////////////////////////////////////////////////////// +// nsScriptLoadHandler +////////////////////////////////////////////////////////////// + +nsScriptLoadHandler::nsScriptLoadHandler(nsScriptLoader *aScriptLoader, + nsScriptLoadRequest *aRequest, + mozilla::dom::SRICheckDataVerifier *aSRIDataVerifier) + : mScriptLoader(aScriptLoader), + mRequest(aRequest), + mSRIDataVerifier(aSRIDataVerifier), + mSRIStatus(NS_OK), + mDecoder(), + mBuffer() +{} + +nsScriptLoadHandler::~nsScriptLoadHandler() +{} + +NS_IMPL_ISUPPORTS(nsScriptLoadHandler, nsIIncrementalStreamLoaderObserver) + +NS_IMETHODIMP +nsScriptLoadHandler::OnIncrementalData(nsIIncrementalStreamLoader* aLoader, + nsISupports* aContext, + uint32_t aDataLength, + const uint8_t* aData, + uint32_t *aConsumedLength) +{ + if (mRequest->IsCanceled()) { + // If request cancelled, ignore any incoming data. + *aConsumedLength = aDataLength; + return NS_OK; + } + + if (!EnsureDecoder(aLoader, aData, aDataLength, + /* aEndOfStream = */ false)) { + return NS_OK; + } + + // Below we will/shall consume entire data chunk. + *aConsumedLength = aDataLength; + + // Decoder has already been initialized. -- trying to decode all loaded bytes. + nsresult rv = TryDecodeRawData(aData, aDataLength, + /* aEndOfStream = */ false); + NS_ENSURE_SUCCESS(rv, rv); + + // If SRI is required for this load, appending new bytes to the hash. + if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) { + mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData); + } + + return rv; +} + +nsresult +nsScriptLoadHandler::TryDecodeRawData(const uint8_t* aData, + uint32_t aDataLength, + bool aEndOfStream) +{ + int32_t srcLen = aDataLength; + const char* src = reinterpret_cast<const char *>(aData); + int32_t dstLen; + nsresult rv = + mDecoder->GetMaxLength(src, srcLen, &dstLen); + + NS_ENSURE_SUCCESS(rv, rv); + + uint32_t haveRead = mBuffer.length(); + + CheckedInt<uint32_t> capacity = haveRead; + capacity += dstLen; + + if (!capacity.isValid() || !mBuffer.reserve(capacity.value())) { + return NS_ERROR_OUT_OF_MEMORY; + } + + rv = mDecoder->Convert(src, + &srcLen, + mBuffer.begin() + haveRead, + &dstLen); + + NS_ENSURE_SUCCESS(rv, rv); + + haveRead += dstLen; + MOZ_ASSERT(haveRead <= capacity.value(), "mDecoder produced more data than expected"); + MOZ_ALWAYS_TRUE(mBuffer.resizeUninitialized(haveRead)); + + return NS_OK; +} + +bool +nsScriptLoadHandler::EnsureDecoder(nsIIncrementalStreamLoader *aLoader, + const uint8_t* aData, + uint32_t aDataLength, + bool aEndOfStream) +{ + // Check if decoder has already been created. + if (mDecoder) { + return true; + } + + nsAutoCString charset; + + // JavaScript modules are always UTF-8. + if (mRequest->IsModuleRequest()) { + charset = "UTF-8"; + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; + } + + // Determine if BOM check should be done. This occurs either + // if end-of-stream has been reached, or at least 3 bytes have + // been read from input. + if (!aEndOfStream && (aDataLength < 3)) { + return false; + } + + // Do BOM detection. + if (nsContentUtils::CheckForBOM(aData, aDataLength, charset)) { + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; + } + + // BOM detection failed, check content stream for charset. + nsCOMPtr<nsIRequest> req; + nsresult rv = aLoader->GetRequest(getter_AddRefs(req)); + NS_ASSERTION(req, "StreamLoader's request went away prematurely"); + NS_ENSURE_SUCCESS(rv, false); + + nsCOMPtr<nsIChannel> channel = do_QueryInterface(req); + + if (channel && + NS_SUCCEEDED(channel->GetContentCharset(charset)) && + EncodingUtils::FindEncodingForLabel(charset, charset)) { + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; + } + + // Check the hint charset from the script element or preload + // request. + nsAutoString hintCharset; + if (!mRequest->IsPreload()) { + mRequest->mElement->GetScriptCharset(hintCharset); + } else { + nsTArray<nsScriptLoader::PreloadInfo>::index_type i = + mScriptLoader->mPreloads.IndexOf(mRequest, 0, + nsScriptLoader::PreloadRequestComparator()); + + NS_ASSERTION(i != mScriptLoader->mPreloads.NoIndex, + "Incorrect preload bookkeeping"); + hintCharset = mScriptLoader->mPreloads[i].mCharset; + } + + if (EncodingUtils::FindEncodingForLabel(hintCharset, charset)) { + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; + } + + // Get the charset from the charset of the document. + if (mScriptLoader->mDocument) { + charset = mScriptLoader->mDocument->GetDocumentCharacterSet(); + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; + } + + // Curiously, there are various callers that don't pass aDocument. The + // fallback in the old code was ISO-8859-1, which behaved like + // windows-1252. Saying windows-1252 for clarity and for compliance + // with the Encoding Standard. + charset = "windows-1252"; + mDecoder = EncodingUtils::DecoderForEncoding(charset); + return true; +} + +NS_IMETHODIMP +nsScriptLoadHandler::OnStreamComplete(nsIIncrementalStreamLoader* aLoader, + nsISupports* aContext, + nsresult aStatus, + uint32_t aDataLength, + const uint8_t* aData) +{ + if (!mRequest->IsCanceled()) { + DebugOnly<bool> encoderSet = + EnsureDecoder(aLoader, aData, aDataLength, /* aEndOfStream = */ true); + MOZ_ASSERT(encoderSet); + DebugOnly<nsresult> rv = TryDecodeRawData(aData, aDataLength, + /* aEndOfStream = */ true); + + // If SRI is required for this load, appending new bytes to the hash. + if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) { + mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData); + } + } + + // we have to mediate and use mRequest. + return mScriptLoader->OnStreamComplete(aLoader, mRequest, aStatus, mSRIStatus, + mBuffer, mSRIDataVerifier); +} |