forked from mirrors/gecko-dev
2671 lines
89 KiB
C++
2671 lines
89 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* loading of CSS style sheets using the network APIs */
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#include "mozilla/css/Loader.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/dom/DocGroup.h"
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#include "mozilla/dom/SRILogHelper.h"
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#include "mozilla/IntegerPrintfMacros.h"
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#include "mozilla/LoadInfo.h"
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#include "mozilla/Logging.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/StyleSheetInlines.h"
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#include "mozilla/SystemGroup.h"
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#include "mozilla/ResultExtensions.h"
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#include "mozilla/URLPreloader.h"
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#include "nsIRunnable.h"
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#include "nsSyncLoadService.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIURI.h"
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#include "nsNetUtil.h"
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#include "nsIProtocolHandler.h"
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#include "nsContentUtils.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsContentPolicyUtils.h"
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#include "nsIHttpChannel.h"
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#include "nsIHttpChannelInternal.h"
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#include "nsIClassOfService.h"
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#include "nsIScriptError.h"
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#include "nsMimeTypes.h"
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#include "nsIStyleSheetLinkingElement.h"
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#include "nsICSSLoaderObserver.h"
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#include "nsThreadUtils.h"
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#include "nsGkAtoms.h"
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#include "nsIThreadInternal.h"
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#include "nsINetworkPredictor.h"
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#include "nsStringStream.h"
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#include "mozilla/dom/MediaList.h"
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#include "mozilla/dom/ShadowRoot.h"
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#include "mozilla/dom/URL.h"
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#include "mozilla/AsyncEventDispatcher.h"
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#include "mozilla/ServoBindings.h"
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#include "mozilla/StyleSheet.h"
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#include "mozilla/StyleSheetInlines.h"
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#include "mozilla/ConsoleReportCollector.h"
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#include "mozilla/ServoUtils.h"
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#include "mozilla/css/StreamLoader.h"
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#ifdef MOZ_XUL
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#include "nsXULPrototypeCache.h"
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#endif
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#include "nsError.h"
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#include "nsIContentSecurityPolicy.h"
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#include "mozilla/dom/SRICheck.h"
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#include "mozilla/Encoding.h"
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using namespace mozilla::dom;
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// 1024 bytes is specified in https://drafts.csswg.org/css-syntax/
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#define SNIFFING_BUFFER_SIZE 1024
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/**
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* OVERALL ARCHITECTURE
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*
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* The CSS Loader gets requests to load various sorts of style sheets:
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* inline style from <style> elements, linked style, @import-ed child
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* sheets, non-document sheets. The loader handles the following tasks:
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* 1) Creation of the actual style sheet objects: CreateSheet()
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* 2) setting of the right media, title, enabled state, etc on the
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* sheet: PrepareSheet()
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* 3) Insertion of the sheet in the proper cascade order:
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* InsertSheetInTree() and InsertChildSheet()
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* 4) Load of the sheet: LoadSheet() including security checks
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* 5) Parsing of the sheet: ParseSheet()
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* 6) Cleanup: SheetComplete()
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*
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* The detailed documentation for these functions is found with the
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* function implementations.
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*
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* The following helper object is used:
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* SheetLoadData -- a small class that is used to store all the
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* information needed for the loading of a sheet;
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* this class handles listening for the stream
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* loader completion and also handles charset
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* determination.
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*/
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namespace mozilla {
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namespace css {
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#include "mozilla/Logging.h"
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static mozilla::LazyLogModule sCssLoaderLog("nsCSSLoader");
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static mozilla::LazyLogModule gSriPRLog("SRI");
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#define LOG_ERROR(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Error, args)
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#define LOG_WARN(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Warning, args)
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#define LOG_DEBUG(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Debug, args)
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#define LOG(args) LOG_DEBUG(args)
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#define LOG_ERROR_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Error)
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#define LOG_WARN_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Warning)
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#define LOG_DEBUG_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Debug)
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#define LOG_ENABLED() LOG_DEBUG_ENABLED()
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#define LOG_URI(format, uri) \
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PR_BEGIN_MACRO \
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NS_ASSERTION(uri, "Logging null uri"); \
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if (LOG_ENABLED()) { \
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LOG((format, uri->GetSpecOrDefault().get())); \
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} \
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PR_END_MACRO
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// And some convenience strings...
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static const char* const gStateStrings[] = {
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"eSheetStateUnknown",
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"eSheetNeedsParser",
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"eSheetPending",
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"eSheetLoading",
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"eSheetComplete"
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};
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/********************************
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* SheetLoadData implementation *
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********************************/
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NS_IMPL_ISUPPORTS(SheetLoadData, nsIRunnable,
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nsIThreadObserver)
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SheetLoadData::SheetLoadData(Loader* aLoader,
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const nsAString& aTitle,
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nsIURI* aURI,
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StyleSheet* aSheet,
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nsIStyleSheetLinkingElement* aOwningElement,
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IsAlternate aIsAlternate,
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MediaMatched aMediaMatches,
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nsICSSLoaderObserver* aObserver,
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nsIPrincipal* aLoaderPrincipal,
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nsINode* aRequestingNode)
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: mLoader(aLoader)
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, mTitle(aTitle)
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, mEncoding(nullptr)
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, mURI(aURI)
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, mLineNumber(1)
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, mSheet(aSheet)
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, mNext(nullptr)
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, mPendingChildren(0)
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, mSyncLoad(false)
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, mIsNonDocumentSheet(false)
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, mIsLoading(false)
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, mIsBeingParsed(false)
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, mIsCancelled(false)
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, mMustNotify(false)
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, mWasAlternate(aIsAlternate == IsAlternate::Yes)
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, mMediaMatched(aMediaMatches == MediaMatched::Yes)
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, mUseSystemPrincipal(false)
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, mSheetAlreadyComplete(false)
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, mIsCrossOriginNoCORS(false)
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, mBlockResourceTiming(false)
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, mLoadFailed(false)
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, mOwningElement(aOwningElement)
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, mObserver(aObserver)
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, mLoaderPrincipal(aLoaderPrincipal)
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, mRequestingNode(aRequestingNode)
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, mPreloadEncoding(nullptr)
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{
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MOZ_ASSERT(mLoader, "Must have a loader!");
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}
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SheetLoadData::SheetLoadData(Loader* aLoader,
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nsIURI* aURI,
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StyleSheet* aSheet,
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SheetLoadData* aParentData,
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nsICSSLoaderObserver* aObserver,
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nsIPrincipal* aLoaderPrincipal,
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nsINode* aRequestingNode)
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: mLoader(aLoader)
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, mEncoding(nullptr)
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, mURI(aURI)
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, mLineNumber(1)
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, mSheet(aSheet)
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, mNext(nullptr)
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, mParentData(aParentData)
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, mPendingChildren(0)
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, mSyncLoad(false)
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, mIsNonDocumentSheet(false)
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, mIsLoading(false)
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, mIsBeingParsed(false)
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, mIsCancelled(false)
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, mMustNotify(false)
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, mWasAlternate(false)
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, mMediaMatched(true)
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, mUseSystemPrincipal(false)
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, mSheetAlreadyComplete(false)
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, mIsCrossOriginNoCORS(false)
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, mBlockResourceTiming(false)
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, mLoadFailed(false)
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, mOwningElement(nullptr)
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, mObserver(aObserver)
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, mLoaderPrincipal(aLoaderPrincipal)
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, mRequestingNode(aRequestingNode)
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, mPreloadEncoding(nullptr)
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{
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MOZ_ASSERT(mLoader, "Must have a loader!");
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if (mParentData) {
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mSyncLoad = mParentData->mSyncLoad;
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mIsNonDocumentSheet = mParentData->mIsNonDocumentSheet;
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mUseSystemPrincipal = mParentData->mUseSystemPrincipal;
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++(mParentData->mPendingChildren);
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}
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MOZ_ASSERT(!mUseSystemPrincipal || mSyncLoad,
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"Shouldn't use system principal for async loads");
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}
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SheetLoadData::SheetLoadData(Loader* aLoader,
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nsIURI* aURI,
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StyleSheet* aSheet,
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bool aSyncLoad,
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bool aUseSystemPrincipal,
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const Encoding* aPreloadEncoding,
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nsICSSLoaderObserver* aObserver,
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nsIPrincipal* aLoaderPrincipal,
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nsINode* aRequestingNode)
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: mLoader(aLoader)
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, mEncoding(nullptr)
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, mURI(aURI)
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, mLineNumber(1)
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, mSheet(aSheet)
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, mNext(nullptr)
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, mPendingChildren(0)
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, mSyncLoad(aSyncLoad)
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, mIsNonDocumentSheet(true)
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, mIsLoading(false)
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, mIsBeingParsed(false)
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, mIsCancelled(false)
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, mMustNotify(false)
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, mWasAlternate(false)
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, mMediaMatched(true)
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, mUseSystemPrincipal(aUseSystemPrincipal)
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, mSheetAlreadyComplete(false)
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, mIsCrossOriginNoCORS(false)
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, mBlockResourceTiming(false)
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, mLoadFailed(false)
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, mOwningElement(nullptr)
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, mObserver(aObserver)
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, mLoaderPrincipal(aLoaderPrincipal)
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, mRequestingNode(aRequestingNode)
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, mPreloadEncoding(aPreloadEncoding)
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{
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MOZ_ASSERT(mLoader, "Must have a loader!");
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MOZ_ASSERT(!mUseSystemPrincipal || mSyncLoad,
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"Shouldn't use system principal for async loads");
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}
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SheetLoadData::~SheetLoadData()
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{
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NS_CSS_NS_RELEASE_LIST_MEMBER(SheetLoadData, this, mNext);
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}
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NS_IMETHODIMP
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SheetLoadData::Run()
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{
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mLoader->HandleLoadEvent(this);
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return NS_OK;
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}
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NS_IMETHODIMP
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SheetLoadData::OnDispatchedEvent()
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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SheetLoadData::OnProcessNextEvent(nsIThreadInternal* aThread,
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bool aMayWait)
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{
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// XXXkhuey this is insane!
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// We want to fire our load even before or after event processing,
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// whichever comes first.
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FireLoadEvent(aThread);
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return NS_OK;
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}
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NS_IMETHODIMP
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SheetLoadData::AfterProcessNextEvent(nsIThreadInternal* aThread,
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bool aEventWasProcessed)
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{
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// XXXkhuey this too!
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// We want to fire our load even before or after event processing,
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// whichever comes first.
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FireLoadEvent(aThread);
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return NS_OK;
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}
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void
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SheetLoadData::FireLoadEvent(nsIThreadInternal* aThread)
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{
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// First remove ourselves as a thread observer. But we need to keep
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// ourselves alive while doing that!
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RefPtr<SheetLoadData> kungFuDeathGrip(this);
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aThread->RemoveObserver(this);
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// Now fire the event
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nsCOMPtr<nsINode> node = do_QueryInterface(mOwningElement);
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NS_ASSERTION(node, "How did that happen???");
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nsContentUtils::DispatchTrustedEvent(node->OwnerDoc(),
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node,
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mLoadFailed ?
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NS_LITERAL_STRING("error") :
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NS_LITERAL_STRING("load"),
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CanBubble::eNo, Cancelable::eNo);
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// And unblock onload
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mLoader->UnblockOnload(true);
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}
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void
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SheetLoadData::ScheduleLoadEventIfNeeded()
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{
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if (!mOwningElement) {
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return;
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}
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nsCOMPtr<nsIThread> thread = do_GetCurrentThread();
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nsCOMPtr<nsIThreadInternal> internalThread = do_QueryInterface(thread);
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if (NS_SUCCEEDED(internalThread->AddObserver(this))) {
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// Make sure to block onload here
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mLoader->BlockOnload();
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}
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}
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/*********************
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* Style sheet reuse *
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*********************/
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bool
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LoaderReusableStyleSheets::FindReusableStyleSheet(nsIURI* aURL,
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RefPtr<StyleSheet>& aResult)
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{
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MOZ_ASSERT(aURL);
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for (size_t i = mReusableSheets.Length(); i > 0; --i) {
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size_t index = i - 1;
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bool sameURI;
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MOZ_ASSERT(mReusableSheets[index]->GetOriginalURI());
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nsresult rv = aURL->Equals(mReusableSheets[index]->GetOriginalURI(),
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&sameURI);
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if (!NS_FAILED(rv) && sameURI) {
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aResult = mReusableSheets[index];
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mReusableSheets.RemoveElementAt(index);
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return true;
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}
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}
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return false;
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}
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/*************************
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* Loader Implementation *
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*************************/
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Loader::Loader()
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: mDocument(nullptr)
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, mDatasToNotifyOn(0)
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, mCompatMode(eCompatibility_FullStandards)
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, mEnabled(true)
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, mReporter(new ConsoleReportCollector())
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#ifdef DEBUG
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, mSyncCallback(false)
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#endif
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{
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}
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Loader::Loader(DocGroup* aDocGroup)
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: Loader()
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{
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mDocGroup = aDocGroup;
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}
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Loader::Loader(nsIDocument* aDocument)
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: Loader()
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{
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mDocument = aDocument;
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MOZ_ASSERT(mDocument, "We should get a valid document from the caller!");
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}
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Loader::~Loader()
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{
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NS_ASSERTION(!mSheets || mSheets->mLoadingDatas.Count() == 0,
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"How did we get destroyed when there are loading data?");
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NS_ASSERTION(!mSheets || mSheets->mPendingDatas.Count() == 0,
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"How did we get destroyed when there are pending data?");
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// Note: no real need to revoke our stylesheet loaded events -- they
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// hold strong references to us, so if we're going away that means
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// they're all done.
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}
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void
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Loader::DropDocumentReference(void)
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{
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mDocument = nullptr;
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// Flush out pending datas just so we don't leak by accident. These
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// loads should short-circuit through the mDocument check in
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// LoadSheet and just end up in SheetComplete immediately
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if (mSheets) {
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StartDeferredLoads();
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}
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}
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void
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Loader::DocumentStyleSheetSetChanged()
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{
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MOZ_ASSERT(mDocument);
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// start any pending alternates that aren't alternates anymore
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if (!mSheets) {
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return;
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}
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LoadDataArray arr(mSheets->mPendingDatas.Count());
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for (auto iter = mSheets->mPendingDatas.Iter(); !iter.Done(); iter.Next()) {
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SheetLoadData* data = iter.Data();
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MOZ_ASSERT(data, "Must have a data");
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// Note that we don't want to affect what the selected style set is, so
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// use true for aHasAlternateRel.
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auto isAlternate = data->mLoader->IsAlternateSheet(data->mTitle, true);
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if (isAlternate == IsAlternate::No) {
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arr.AppendElement(data);
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iter.Remove();
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}
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}
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mDatasToNotifyOn += arr.Length();
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for (uint32_t i = 0; i < arr.Length(); ++i) {
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--mDatasToNotifyOn;
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LoadSheet(arr[i], eSheetNeedsParser, false);
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}
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}
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static const char kCharsetSym[] = "@charset \"";
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static bool GetCharsetFromData(const char* aStyleSheetData,
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uint32_t aDataLength,
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nsACString& aCharset)
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{
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aCharset.Truncate();
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if (aDataLength <= sizeof(kCharsetSym) - 1)
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return false;
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if (strncmp(aStyleSheetData,
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kCharsetSym,
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sizeof(kCharsetSym) - 1)) {
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return false;
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}
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for (uint32_t i = sizeof(kCharsetSym) - 1; i < aDataLength; ++i) {
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char c = aStyleSheetData[i];
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if (c == '"') {
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++i;
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if (i < aDataLength && aStyleSheetData[i] == ';') {
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return true;
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}
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// fail
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break;
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}
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aCharset.Append(c);
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}
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// Did not see end quote or semicolon
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aCharset.Truncate();
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return false;
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}
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NotNull<const Encoding*>
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SheetLoadData::DetermineNonBOMEncoding(nsACString const& aSegment,
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nsIChannel* aChannel)
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{
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const Encoding* encoding;
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nsAutoCString label;
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// Check HTTP
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if (aChannel && NS_SUCCEEDED(aChannel->GetContentCharset(label))) {
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encoding = Encoding::ForLabel(label);
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if (encoding) {
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return WrapNotNull(encoding);
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}
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}
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// Check @charset
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auto sniffingLength = aSegment.Length();
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if (sniffingLength > SNIFFING_BUFFER_SIZE) {
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sniffingLength = SNIFFING_BUFFER_SIZE;
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}
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if (GetCharsetFromData(aSegment.BeginReading(), sniffingLength, label)) {
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encoding = Encoding::ForLabel(label);
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if (encoding == UTF_16BE_ENCODING || encoding == UTF_16LE_ENCODING) {
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return UTF_8_ENCODING;
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}
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if (encoding) {
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return WrapNotNull(encoding);
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}
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}
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// Now try the charset on the <link> or processing instruction
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// that loaded us
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if (mOwningElement) {
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nsAutoString label16;
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mOwningElement->GetCharset(label16);
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|
encoding = Encoding::ForLabel(label16);
|
|
if (encoding) {
|
|
return WrapNotNull(encoding);
|
|
}
|
|
}
|
|
|
|
// In the preload case, the value of the charset attribute on <link> comes
|
|
// in via mPreloadEncoding instead.
|
|
if (mPreloadEncoding) {
|
|
return WrapNotNull(mPreloadEncoding);
|
|
}
|
|
|
|
// Try charset from the parent stylesheet.
|
|
if (mParentData) {
|
|
encoding = mParentData->mEncoding;
|
|
if (encoding) {
|
|
return WrapNotNull(encoding);
|
|
}
|
|
}
|
|
|
|
if (mLoader->mDocument) {
|
|
// Use the document charset.
|
|
return mLoader->mDocument->GetDocumentCharacterSet();
|
|
}
|
|
|
|
return UTF_8_ENCODING;
|
|
}
|
|
|
|
already_AddRefed<nsIURI>
|
|
SheetLoadData::GetReferrerURI()
|
|
{
|
|
nsCOMPtr<nsIURI> uri;
|
|
if (mParentData)
|
|
uri = mParentData->mSheet->GetSheetURI();
|
|
if (!uri && mLoader->mDocument)
|
|
uri = mLoader->mDocument->GetDocumentURI();
|
|
return uri.forget();
|
|
}
|
|
|
|
static nsresult
|
|
VerifySheetIntegrity(const SRIMetadata& aMetadata,
|
|
nsIChannel* aChannel,
|
|
const nsACString& aFirst,
|
|
const nsACString& aSecond,
|
|
const nsACString& aSourceFileURI,
|
|
nsIConsoleReportCollector* aReporter)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aReporter);
|
|
|
|
if (MOZ_LOG_TEST(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug)) {
|
|
nsAutoCString requestURL;
|
|
nsCOMPtr<nsIURI> originalURI;
|
|
if (aChannel &&
|
|
NS_SUCCEEDED(aChannel->GetOriginalURI(getter_AddRefs(originalURI))) &&
|
|
originalURI) {
|
|
originalURI->GetAsciiSpec(requestURL);
|
|
}
|
|
MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
|
|
("VerifySheetIntegrity (unichar stream)"));
|
|
}
|
|
|
|
SRICheckDataVerifier verifier(aMetadata, aSourceFileURI, aReporter);
|
|
nsresult rv =
|
|
verifier.Update(aFirst.Length(), (const uint8_t*)aFirst.BeginReading());
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv =
|
|
verifier.Update(aSecond.Length(), (const uint8_t*)aSecond.BeginReading());
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
return verifier.Verify(aMetadata, aChannel, aSourceFileURI, aReporter);
|
|
}
|
|
|
|
/*
|
|
* Stream completion code shared by Stylo and the old style system.
|
|
*
|
|
* Here we need to check that the load did not give us an http error
|
|
* page and check the mimetype on the channel to make sure we're not
|
|
* loading non-text/css data in standards mode.
|
|
*/
|
|
nsresult
|
|
SheetLoadData::VerifySheetReadyToParse(nsresult aStatus,
|
|
const nsACString& aBytes1,
|
|
const nsACString& aBytes2,
|
|
nsIChannel* aChannel)
|
|
{
|
|
LOG(("SheetLoadData::OnStreamComplete"));
|
|
NS_ASSERTION(!mLoader->mSyncCallback, "Synchronous callback from necko");
|
|
|
|
if (mIsCancelled) {
|
|
// Just return. Don't call SheetComplete -- it's already been
|
|
// called and calling it again will lead to an extra NS_RELEASE on
|
|
// this data and a likely crash.
|
|
return NS_OK;
|
|
}
|
|
|
|
if (!mLoader->mDocument && !mIsNonDocumentSheet) {
|
|
// Sorry, we don't care about this load anymore
|
|
LOG_WARN((" No document and not non-document sheet; dropping load"));
|
|
mLoader->SheetComplete(this, NS_BINDING_ABORTED);
|
|
return NS_OK;
|
|
}
|
|
|
|
if (NS_FAILED(aStatus)) {
|
|
LOG_WARN((" Load failed: status 0x%" PRIx32, static_cast<uint32_t>(aStatus)));
|
|
// Handle sheet not loading error because source was a tracking URL.
|
|
// We make a note of this sheet node by including it in a dedicated
|
|
// array of blocked tracking nodes under its parent document.
|
|
//
|
|
// Multiple sheet load instances might be tied to this request,
|
|
// we annotate each one linked to a valid owning element (node).
|
|
if (aStatus == NS_ERROR_TRACKING_URI) {
|
|
nsIDocument* doc = mLoader->GetDocument();
|
|
if (doc) {
|
|
for (SheetLoadData* data = this; data; data = data->mNext) {
|
|
// mOwningElement may be null but AddBlockTrackingNode can cope
|
|
nsCOMPtr<nsIContent> content = do_QueryInterface(data->mOwningElement);
|
|
doc->AddBlockedTrackingNode(content);
|
|
}
|
|
}
|
|
}
|
|
mLoader->SheetComplete(this, aStatus);
|
|
return NS_OK;
|
|
}
|
|
|
|
if (!aChannel) {
|
|
mLoader->SheetComplete(this, NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsCOMPtr<nsIURI> originalURI;
|
|
aChannel->GetOriginalURI(getter_AddRefs(originalURI));
|
|
|
|
// If the channel's original URI is "chrome:", we want that, since
|
|
// the observer code in nsXULPrototypeCache depends on chrome stylesheets
|
|
// having a chrome URI. (Whether or not chrome stylesheets come through
|
|
// this codepath seems nondeterministic.)
|
|
// Otherwise we want the potentially-HTTP-redirected URI.
|
|
nsCOMPtr<nsIURI> channelURI;
|
|
NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
|
|
|
|
if (!channelURI || !originalURI) {
|
|
NS_ERROR("Someone just violated the nsIRequest contract");
|
|
LOG_WARN((" Channel without a URI. Bad!"));
|
|
mLoader->SheetComplete(this, NS_ERROR_UNEXPECTED);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsCOMPtr<nsIPrincipal> principal;
|
|
nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
|
|
nsresult result = NS_ERROR_NOT_AVAILABLE;
|
|
if (secMan) { // Could be null if we already shut down
|
|
if (mUseSystemPrincipal) {
|
|
result = secMan->GetSystemPrincipal(getter_AddRefs(principal));
|
|
} else {
|
|
result =
|
|
secMan->GetChannelResultPrincipal(aChannel, getter_AddRefs(principal));
|
|
}
|
|
}
|
|
|
|
if (NS_FAILED(result)) {
|
|
LOG_WARN((" Couldn't get principal"));
|
|
mLoader->SheetComplete(this, result);
|
|
return NS_OK;
|
|
}
|
|
|
|
mSheet->SetPrincipal(principal);
|
|
|
|
if (mLoaderPrincipal && mSheet->GetCORSMode() == CORS_NONE) {
|
|
bool subsumed;
|
|
result = mLoaderPrincipal->Subsumes(principal, &subsumed);
|
|
if (NS_FAILED(result) || !subsumed) {
|
|
mIsCrossOriginNoCORS = true;
|
|
}
|
|
}
|
|
|
|
// If it's an HTTP channel, we want to make sure this is not an
|
|
// error document we got.
|
|
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(aChannel));
|
|
if (httpChannel) {
|
|
bool requestSucceeded;
|
|
result = httpChannel->GetRequestSucceeded(&requestSucceeded);
|
|
if (NS_SUCCEEDED(result) && !requestSucceeded) {
|
|
LOG((" Load returned an error page"));
|
|
mLoader->SheetComplete(this, NS_ERROR_NOT_AVAILABLE);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsAutoCString sourceMapURL;
|
|
if (nsContentUtils::GetSourceMapURL(httpChannel, sourceMapURL)) {
|
|
mSheet->SetSourceMapURL(NS_ConvertUTF8toUTF16(sourceMapURL));
|
|
}
|
|
}
|
|
|
|
nsAutoCString contentType;
|
|
aChannel->GetContentType(contentType);
|
|
|
|
// In standards mode, a style sheet must have one of these MIME
|
|
// types to be processed at all. In quirks mode, we accept any
|
|
// MIME type, but only if the style sheet is same-origin with the
|
|
// requesting document or parent sheet. See bug 524223.
|
|
|
|
bool validType = contentType.EqualsLiteral("text/css") ||
|
|
contentType.EqualsLiteral(UNKNOWN_CONTENT_TYPE) ||
|
|
contentType.IsEmpty();
|
|
|
|
if (!validType) {
|
|
const char *errorMessage;
|
|
uint32_t errorFlag;
|
|
bool sameOrigin = true;
|
|
|
|
if (mLoaderPrincipal) {
|
|
bool subsumed;
|
|
result = mLoaderPrincipal->Subsumes(principal, &subsumed);
|
|
if (NS_FAILED(result) || !subsumed) {
|
|
sameOrigin = false;
|
|
}
|
|
}
|
|
|
|
if (sameOrigin && mLoader->mCompatMode == eCompatibility_NavQuirks) {
|
|
errorMessage = "MimeNotCssWarn";
|
|
errorFlag = nsIScriptError::warningFlag;
|
|
} else {
|
|
errorMessage = "MimeNotCss";
|
|
errorFlag = nsIScriptError::errorFlag;
|
|
}
|
|
|
|
const nsString& specUTF16 =
|
|
NS_ConvertUTF8toUTF16(channelURI->GetSpecOrDefault());
|
|
const nsString& ctypeUTF16 = NS_ConvertASCIItoUTF16(contentType);
|
|
const char16_t *strings[] = { specUTF16.get(), ctypeUTF16.get() };
|
|
|
|
nsCOMPtr<nsIURI> referrer = GetReferrerURI();
|
|
nsContentUtils::ReportToConsole(errorFlag,
|
|
NS_LITERAL_CSTRING("CSS Loader"),
|
|
mLoader->mDocument,
|
|
nsContentUtils::eCSS_PROPERTIES,
|
|
errorMessage,
|
|
strings, ArrayLength(strings),
|
|
referrer);
|
|
|
|
if (errorFlag == nsIScriptError::errorFlag) {
|
|
LOG_WARN((" Ignoring sheet with improper MIME type %s",
|
|
contentType.get()));
|
|
mLoader->SheetComplete(this, NS_ERROR_NOT_AVAILABLE);
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
SRIMetadata sriMetadata;
|
|
mSheet->GetIntegrity(sriMetadata);
|
|
if (sriMetadata.IsEmpty()) {
|
|
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
|
|
if (loadInfo && loadInfo->GetEnforceSRI()) {
|
|
LOG((" Load was blocked by SRI"));
|
|
MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug,
|
|
("css::Loader::OnStreamComplete, required SRI not found"));
|
|
mLoader->SheetComplete(this, NS_ERROR_SRI_CORRUPT);
|
|
// log the failed load to web console
|
|
nsCOMPtr<nsIContentSecurityPolicy> csp;
|
|
loadInfo->LoadingPrincipal()->GetCsp(getter_AddRefs(csp));
|
|
nsAutoCString spec;
|
|
mLoader->mDocument->GetDocumentURI()->GetAsciiSpec(spec);
|
|
// line number unknown. mRequestingNode doesn't bear this info.
|
|
csp->LogViolationDetails(
|
|
nsIContentSecurityPolicy::VIOLATION_TYPE_REQUIRE_SRI_FOR_STYLE,
|
|
nullptr, // triggering element
|
|
NS_ConvertUTF8toUTF16(spec), EmptyString(),
|
|
0, 0, EmptyString(), EmptyString());
|
|
return NS_OK;
|
|
}
|
|
} else {
|
|
nsAutoCString sourceUri;
|
|
if (mLoader->mDocument && mLoader->mDocument->GetDocumentURI()) {
|
|
mLoader->mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
|
|
}
|
|
nsresult rv = VerifySheetIntegrity(
|
|
sriMetadata, aChannel, aBytes1, aBytes2, sourceUri, mLoader->mReporter);
|
|
|
|
nsCOMPtr<nsILoadGroup> loadGroup;
|
|
aChannel->GetLoadGroup(getter_AddRefs(loadGroup));
|
|
if (loadGroup) {
|
|
mLoader->mReporter->FlushConsoleReports(loadGroup);
|
|
} else {
|
|
mLoader->mReporter->FlushConsoleReports(mLoader->mDocument);
|
|
}
|
|
|
|
if (NS_FAILED(rv)) {
|
|
LOG((" Load was blocked by SRI"));
|
|
MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug,
|
|
("css::Loader::OnStreamComplete, bad metadata"));
|
|
mLoader->SheetComplete(this, NS_ERROR_SRI_CORRUPT);
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
// Enough to set the URIs on mSheet, since any sibling datas we have share
|
|
// the same mInner as mSheet and will thus get the same URI.
|
|
mSheet->SetURIs(channelURI, originalURI, channelURI);
|
|
return NS_OK_PARSE_SHEET;
|
|
}
|
|
|
|
Loader::IsAlternate
|
|
Loader::IsAlternateSheet(const nsAString& aTitle, bool aHasAlternateRel)
|
|
{
|
|
// A sheet is alternate if it has a nonempty title that doesn't match the
|
|
// currently selected style set. But if there _is_ no currently selected
|
|
// style set, the sheet wasn't marked as an alternate explicitly, and aTitle
|
|
// is nonempty, we should select the style set corresponding to aTitle, since
|
|
// that's a preferred sheet.
|
|
if (aTitle.IsEmpty()) {
|
|
return IsAlternate::No;
|
|
}
|
|
|
|
if (mDocument) {
|
|
const nsString& currentSheetSet = mDocument->GetCurrentStyleSheetSet();
|
|
if (!aHasAlternateRel && currentSheetSet.IsEmpty()) {
|
|
// There's no preferred set yet, and we now have a sheet with a title.
|
|
// Make that be the preferred set.
|
|
// FIXME(emilio): This is kinda wild, can we do it somewhere else?
|
|
mDocument->SetPreferredStyleSheetSet(aTitle);
|
|
// We're definitely not an alternate. Also, beware that at this point
|
|
// currentSheetSet may dangle.
|
|
return IsAlternate::No;
|
|
}
|
|
|
|
if (aTitle.Equals(currentSheetSet)) {
|
|
return IsAlternate::No;
|
|
}
|
|
}
|
|
|
|
return IsAlternate::Yes;
|
|
}
|
|
|
|
nsresult
|
|
Loader::ObsoleteSheet(nsIURI* aURI)
|
|
{
|
|
if (!mSheets) {
|
|
return NS_OK;
|
|
}
|
|
if (!aURI) {
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
for (auto iter = mSheets->mCompleteSheets.Iter(); !iter.Done(); iter.Next()) {
|
|
nsIURI* sheetURI = iter.Key()->GetURI();
|
|
bool areEqual;
|
|
nsresult rv = sheetURI->Equals(aURI, &areEqual);
|
|
if (NS_SUCCEEDED(rv) && areEqual) {
|
|
iter.Remove();
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
Loader::CheckContentPolicy(nsIPrincipal* aLoadingPrincipal,
|
|
nsIPrincipal* aTriggeringPrincipal,
|
|
nsIURI* aTargetURI,
|
|
nsINode* aRequestingNode,
|
|
bool aIsPreload)
|
|
{
|
|
// When performing a system load (e.g. aUseSystemPrincipal = true)
|
|
// then aLoadingPrincipal == null; don't consult content policies.
|
|
if (!aLoadingPrincipal) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsContentPolicyType contentPolicyType =
|
|
aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD
|
|
: nsIContentPolicy::TYPE_INTERNAL_STYLESHEET;
|
|
|
|
nsCOMPtr<nsILoadInfo> secCheckLoadInfo =
|
|
new net::LoadInfo(aLoadingPrincipal,
|
|
aTriggeringPrincipal,
|
|
aRequestingNode,
|
|
nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK,
|
|
contentPolicyType);
|
|
|
|
int16_t shouldLoad = nsIContentPolicy::ACCEPT;
|
|
nsresult rv = NS_CheckContentLoadPolicy(aTargetURI,
|
|
secCheckLoadInfo,
|
|
NS_LITERAL_CSTRING("text/css"),
|
|
&shouldLoad,
|
|
nsContentUtils::GetContentPolicy());
|
|
if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) {
|
|
return NS_ERROR_CONTENT_BLOCKED;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* CreateSheet() creates a CSSStyleSheet object for the given URI,
|
|
* if any. If there is no URI given, we just create a new style sheet
|
|
* object. Otherwise, we check for an existing style sheet object for
|
|
* that uri in various caches and clone it if we find it. Cloned
|
|
* sheets will have the title/media/enabled state of the sheet they
|
|
* are clones off; make sure to call PrepareSheet() on the result of
|
|
* CreateSheet().
|
|
*/
|
|
nsresult
|
|
Loader::CreateSheet(nsIURI* aURI,
|
|
nsIContent* aLinkingContent,
|
|
nsIPrincipal* aLoaderPrincipal,
|
|
css::SheetParsingMode aParsingMode,
|
|
CORSMode aCORSMode,
|
|
ReferrerPolicy aReferrerPolicy,
|
|
const nsAString& aIntegrity,
|
|
bool aSyncLoad,
|
|
StyleSheetState& aSheetState,
|
|
RefPtr<StyleSheet>* aSheet)
|
|
{
|
|
LOG(("css::Loader::CreateSheet"));
|
|
MOZ_ASSERT(aSheet, "Null out param!");
|
|
|
|
if (!mSheets) {
|
|
mSheets = MakeUnique<Sheets>();
|
|
}
|
|
|
|
*aSheet = nullptr;
|
|
aSheetState = eSheetStateUnknown;
|
|
|
|
if (aURI) {
|
|
aSheetState = eSheetComplete;
|
|
RefPtr<StyleSheet> sheet;
|
|
|
|
// First, the XUL cache
|
|
#ifdef MOZ_XUL
|
|
if (IsChromeURI(aURI)) {
|
|
nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
|
|
if (cache && cache->IsEnabled()) {
|
|
sheet = cache->GetStyleSheet(aURI);
|
|
LOG((" From XUL cache: %p", sheet.get()));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
bool fromCompleteSheets = false;
|
|
if (!sheet) {
|
|
// Then our per-document complete sheets.
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy);
|
|
|
|
StyleSheet* completeSheet = nullptr;
|
|
mSheets->mCompleteSheets.Get(&key, &completeSheet);
|
|
sheet = completeSheet;
|
|
LOG((" From completed: %p", sheet.get()));
|
|
|
|
fromCompleteSheets = !!sheet;
|
|
}
|
|
|
|
if (sheet) {
|
|
// This sheet came from the XUL cache or our per-document hashtable; it
|
|
// better be a complete sheet.
|
|
NS_ASSERTION(sheet->IsComplete(),
|
|
"Sheet thinks it's not complete while we think it is");
|
|
|
|
// Make sure it hasn't been forced to have a unique inner;
|
|
// that is an indication that its rules have been exposed to
|
|
// CSSOM and so we can't use it.
|
|
//
|
|
// Similarly, if the sheet doesn't have the right parsing mode just bail.
|
|
if (sheet->HasForcedUniqueInner() ||
|
|
sheet->ParsingMode() != aParsingMode) {
|
|
LOG((" Not cloning completed sheet %p because it has a "
|
|
"forced unique inner or the wrong parsing mode",
|
|
sheet.get()));
|
|
sheet = nullptr;
|
|
fromCompleteSheets = false;
|
|
}
|
|
}
|
|
|
|
// Then loading sheets
|
|
if (!sheet && !aSyncLoad) {
|
|
aSheetState = eSheetLoading;
|
|
SheetLoadData* loadData = nullptr;
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy);
|
|
mSheets->mLoadingDatas.Get(&key, &loadData);
|
|
if (loadData) {
|
|
sheet = loadData->mSheet;
|
|
LOG((" From loading: %p", sheet.get()));
|
|
|
|
#ifdef DEBUG
|
|
bool debugEqual;
|
|
NS_ASSERTION((!aLoaderPrincipal && !loadData->mLoaderPrincipal) ||
|
|
(aLoaderPrincipal && loadData->mLoaderPrincipal &&
|
|
NS_SUCCEEDED(aLoaderPrincipal->
|
|
Equals(loadData->mLoaderPrincipal,
|
|
&debugEqual)) && debugEqual),
|
|
"Principals should be the same");
|
|
#endif
|
|
}
|
|
|
|
// Then alternate sheets
|
|
if (!sheet) {
|
|
aSheetState = eSheetPending;
|
|
loadData = nullptr;
|
|
mSheets->mPendingDatas.Get(&key, &loadData);
|
|
if (loadData) {
|
|
sheet = loadData->mSheet;
|
|
LOG((" From pending: %p", sheet.get()));
|
|
|
|
#ifdef DEBUG
|
|
bool debugEqual;
|
|
NS_ASSERTION((!aLoaderPrincipal && !loadData->mLoaderPrincipal) ||
|
|
(aLoaderPrincipal && loadData->mLoaderPrincipal &&
|
|
NS_SUCCEEDED(aLoaderPrincipal->
|
|
Equals(loadData->mLoaderPrincipal,
|
|
&debugEqual)) && debugEqual),
|
|
"Principals should be the same");
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sheet) {
|
|
// The sheet we have now should be either incomplete or without
|
|
// a forced unique inner.
|
|
NS_ASSERTION(!sheet->HasForcedUniqueInner() ||
|
|
!sheet->IsComplete(),
|
|
"Unexpected complete sheet with forced unique inner");
|
|
NS_ASSERTION(sheet->IsComplete() ||
|
|
aSheetState != eSheetComplete,
|
|
"Sheet thinks it's not complete while we think it is");
|
|
|
|
RefPtr<StyleSheet> clonedSheet =
|
|
sheet->Clone(nullptr, nullptr, nullptr, nullptr);
|
|
*aSheet = std::move(clonedSheet);
|
|
if (*aSheet && fromCompleteSheets &&
|
|
!sheet->GetOwnerNode() &&
|
|
!sheet->GetParentSheet()) {
|
|
// The sheet we're cloning isn't actually referenced by
|
|
// anyone. Replace it in the cache, so that if our CSSOM is
|
|
// later modified we don't end up with two copies of our inner
|
|
// hanging around.
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy);
|
|
NS_ASSERTION((*aSheet)->IsComplete(),
|
|
"Should only be caching complete sheets");
|
|
mSheets->mCompleteSheets.Put(&key, *aSheet);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!*aSheet) {
|
|
aSheetState = eSheetNeedsParser;
|
|
nsIURI *sheetURI;
|
|
nsCOMPtr<nsIURI> baseURI;
|
|
nsIURI* originalURI;
|
|
if (!aURI) {
|
|
// Inline style. Use the document's base URL so that @import in
|
|
// the inline sheet picks up the right base.
|
|
NS_ASSERTION(aLinkingContent, "Inline stylesheet without linking content?");
|
|
baseURI = aLinkingContent->GetBaseURI();
|
|
sheetURI = aLinkingContent->OwnerDoc()->GetDocumentURI();
|
|
originalURI = nullptr;
|
|
} else {
|
|
baseURI = aURI;
|
|
sheetURI = aURI;
|
|
originalURI = aURI;
|
|
}
|
|
|
|
SRIMetadata sriMetadata;
|
|
if (!aIntegrity.IsEmpty()) {
|
|
MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug,
|
|
("css::Loader::CreateSheet, integrity=%s",
|
|
NS_ConvertUTF16toUTF8(aIntegrity).get()));
|
|
nsAutoCString sourceUri;
|
|
if (mDocument && mDocument->GetDocumentURI()) {
|
|
mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
|
|
}
|
|
SRICheck::IntegrityMetadata(aIntegrity, sourceUri, mReporter,
|
|
&sriMetadata);
|
|
}
|
|
|
|
*aSheet = new StyleSheet(aParsingMode, aCORSMode, aReferrerPolicy, sriMetadata);
|
|
(*aSheet)->SetURIs(sheetURI, originalURI, baseURI);
|
|
}
|
|
|
|
NS_ASSERTION(*aSheet, "We should have a sheet by now!");
|
|
NS_ASSERTION(aSheetState != eSheetStateUnknown, "Have to set a state!");
|
|
LOG((" State: %s", gStateStrings[aSheetState]));
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
static Loader::MediaMatched
|
|
MediaListMatches(const MediaList* aMediaList, const nsIDocument* aDocument)
|
|
{
|
|
if (!aMediaList || !aDocument) {
|
|
return Loader::MediaMatched::Yes;
|
|
}
|
|
|
|
nsPresContext* pc = aDocument->GetPresContext();
|
|
if (!pc) {
|
|
// Conservatively assume a match.
|
|
return Loader::MediaMatched::Yes;
|
|
}
|
|
|
|
if (aMediaList->Matches(pc)) {
|
|
return Loader::MediaMatched::Yes;
|
|
}
|
|
|
|
return Loader::MediaMatched::No;
|
|
}
|
|
|
|
/**
|
|
* PrepareSheet() handles setting the media and title on the sheet, as
|
|
* well as setting the enabled state based on the title and whether
|
|
* the sheet had "alternate" in its rel.
|
|
*/
|
|
Loader::MediaMatched
|
|
Loader::PrepareSheet(StyleSheet* aSheet,
|
|
const nsAString& aTitle,
|
|
const nsAString& aMediaString,
|
|
MediaList* aMediaList,
|
|
IsAlternate aIsAlternate)
|
|
{
|
|
MOZ_ASSERT(aSheet, "Must have a sheet!");
|
|
|
|
RefPtr<MediaList> mediaList(aMediaList);
|
|
|
|
if (!aMediaString.IsEmpty()) {
|
|
NS_ASSERTION(!aMediaList,
|
|
"must not provide both aMediaString and aMediaList");
|
|
mediaList = MediaList::Create(aMediaString);
|
|
}
|
|
|
|
aSheet->SetMedia(mediaList);
|
|
|
|
aSheet->SetTitle(aTitle);
|
|
aSheet->SetEnabled(aIsAlternate == IsAlternate::No);
|
|
return MediaListMatches(mediaList, mDocument);
|
|
}
|
|
|
|
/**
|
|
* InsertSheetInTree handles ordering of sheets in the document or shadow root.
|
|
*
|
|
* Here we have two types of sheets -- those with linking elements and
|
|
* those without. The latter are loaded by Link: headers, and are only added to
|
|
* the document.
|
|
*
|
|
* The following constraints are observed:
|
|
* 1) Any sheet with a linking element comes after all sheets without
|
|
* linking elements
|
|
* 2) Sheets without linking elements are inserted in the order in
|
|
* which the inserting requests come in, since all of these are
|
|
* inserted during header data processing in the content sink
|
|
* 3) Sheets with linking elements are ordered based on document order
|
|
* as determined by CompareDocumentPosition.
|
|
*/
|
|
void
|
|
Loader::InsertSheetInTree(StyleSheet& aSheet, nsIContent* aLinkingContent)
|
|
{
|
|
LOG(("css::Loader::InsertSheetInTree"));
|
|
MOZ_ASSERT(mDocument, "Must have a document to insert into");
|
|
MOZ_ASSERT(!aLinkingContent ||
|
|
aLinkingContent->IsInUncomposedDoc() ||
|
|
aLinkingContent->IsInShadowTree(),
|
|
"Why would we insert it anywhere?");
|
|
|
|
nsCOMPtr<nsIStyleSheetLinkingElement> linkingElement =
|
|
do_QueryInterface(aLinkingContent);
|
|
if (linkingElement) {
|
|
linkingElement->SetStyleSheet(&aSheet);
|
|
}
|
|
|
|
ShadowRoot* shadow =
|
|
aLinkingContent ? aLinkingContent->GetContainingShadow() : nullptr;
|
|
|
|
auto& target = shadow
|
|
? static_cast<DocumentOrShadowRoot&>(*shadow)
|
|
: static_cast<DocumentOrShadowRoot&>(*mDocument);
|
|
|
|
// XXX Need to cancel pending sheet loads for this element, if any
|
|
|
|
int32_t sheetCount = target.SheetCount();
|
|
|
|
/*
|
|
* Start the walk at the _end_ of the list, since in the typical
|
|
* case we'll just want to append anyway. We want to break out of
|
|
* the loop when insertionPoint points to just before the index we
|
|
* want to insert at. In other words, when we leave the loop
|
|
* insertionPoint is the index of the stylesheet that immediately
|
|
* precedes the one we're inserting.
|
|
*/
|
|
int32_t insertionPoint = sheetCount - 1;
|
|
for (; insertionPoint >= 0; --insertionPoint) {
|
|
nsINode* sheetOwner = target.SheetAt(insertionPoint)->GetOwnerNode();
|
|
if (sheetOwner && !aLinkingContent) {
|
|
// Keep moving; all sheets with a sheetOwner come after all
|
|
// sheets without a linkingNode
|
|
continue;
|
|
}
|
|
|
|
if (!sheetOwner) {
|
|
// Aha! The current sheet has no sheet owner, so we want to insert after
|
|
// it no matter whether we have a linking content or not.
|
|
break;
|
|
}
|
|
|
|
MOZ_ASSERT(aLinkingContent != sheetOwner,
|
|
"Why do we still have our old sheet?");
|
|
|
|
// Have to compare
|
|
if (nsContentUtils::PositionIsBefore(sheetOwner, aLinkingContent)) {
|
|
// The current sheet comes before us, and it better be the first
|
|
// such, because now we break
|
|
break;
|
|
}
|
|
}
|
|
|
|
++insertionPoint;
|
|
|
|
if (shadow) {
|
|
shadow->InsertSheetAt(insertionPoint, aSheet);
|
|
} else {
|
|
mDocument->InsertSheetAt(insertionPoint, aSheet);
|
|
}
|
|
|
|
LOG((" Inserting into target (doc: %d) at position %d", target.AsNode().IsDocument(), insertionPoint));
|
|
}
|
|
|
|
/**
|
|
* InsertChildSheet handles ordering of @import-ed sheet in their
|
|
* parent sheets. Here we want to just insert based on order of the
|
|
* @import rules that imported the sheets. In theory we can't just
|
|
* append to the end because the CSSOM can insert @import rules. In
|
|
* practice, we get the call to load the child sheet before the CSSOM
|
|
* has finished inserting the @import rule, so we have no idea where
|
|
* to put it anyway. So just append for now. (In the future if we
|
|
* want to insert the sheet at the correct position, we'll need to
|
|
* restore CSSStyleSheet::InsertStyleSheetAt, which was removed in
|
|
* bug 1220506.)
|
|
*/
|
|
void
|
|
Loader::InsertChildSheet(StyleSheet& aSheet, StyleSheet& aParentSheet)
|
|
{
|
|
LOG(("css::Loader::InsertChildSheet"));
|
|
|
|
// child sheets should always start out enabled, even if they got
|
|
// cloned off of top-level sheets which were disabled
|
|
aSheet.SetEnabled(true);
|
|
aParentSheet.PrependStyleSheet(&aSheet);
|
|
|
|
LOG((" Inserting into parent sheet"));
|
|
}
|
|
|
|
/**
|
|
* LoadSheet handles the actual load of a sheet. If the load is
|
|
* supposed to be synchronous it just opens a channel synchronously
|
|
* using the given uri, wraps the resulting stream in a converter
|
|
* stream and calls ParseSheet. Otherwise it tries to look for an
|
|
* existing load for this URI and piggyback on it. Failing all that,
|
|
* a new load is kicked off asynchronously.
|
|
*/
|
|
nsresult
|
|
Loader::LoadSheet(SheetLoadData* aLoadData,
|
|
StyleSheetState aSheetState,
|
|
bool aIsPreload)
|
|
{
|
|
LOG(("css::Loader::LoadSheet"));
|
|
MOZ_ASSERT(aLoadData, "Need a load data");
|
|
MOZ_ASSERT(aLoadData->mURI, "Need a URI to load");
|
|
MOZ_ASSERT(aLoadData->mSheet, "Need a sheet to load into");
|
|
MOZ_ASSERT(aSheetState != eSheetComplete, "Why bother?");
|
|
MOZ_ASSERT(!aLoadData->mUseSystemPrincipal || aLoadData->mSyncLoad,
|
|
"Shouldn't use system principal for async loads");
|
|
NS_ASSERTION(mSheets, "mLoadingDatas should be initialized by now.");
|
|
|
|
LOG_URI(" Load from: '%s'", aLoadData->mURI);
|
|
|
|
nsresult rv = NS_OK;
|
|
|
|
if (!mDocument && !aLoadData->mIsNonDocumentSheet) {
|
|
// No point starting the load; just release all the data and such.
|
|
LOG_WARN((" No document and not non-document sheet; pre-dropping load"));
|
|
SheetComplete(aLoadData, NS_BINDING_ABORTED);
|
|
return NS_BINDING_ABORTED;
|
|
}
|
|
|
|
SRIMetadata sriMetadata;
|
|
aLoadData->mSheet->GetIntegrity(sriMetadata);
|
|
|
|
if (aLoadData->mSyncLoad) {
|
|
LOG((" Synchronous load"));
|
|
NS_ASSERTION(!aLoadData->mObserver, "Observer for a sync load?");
|
|
NS_ASSERTION(aSheetState == eSheetNeedsParser,
|
|
"Sync loads can't reuse existing async loads");
|
|
|
|
// Create a StreamLoader instance to which we will feed
|
|
// the data from the sync load. Do this before creating the
|
|
// channel to make error recovery simpler.
|
|
nsCOMPtr<nsIStreamListener> streamLoader = new StreamLoader(aLoadData);
|
|
|
|
if (mDocument) {
|
|
mozilla::net::PredictorLearn(aLoadData->mURI, mDocument->GetDocumentURI(),
|
|
nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE,
|
|
mDocument);
|
|
}
|
|
|
|
nsSecurityFlags securityFlags =
|
|
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS |
|
|
nsILoadInfo::SEC_ALLOW_CHROME;
|
|
|
|
nsContentPolicyType contentPolicyType =
|
|
aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD
|
|
: nsIContentPolicy::TYPE_INTERNAL_STYLESHEET;
|
|
|
|
// Just load it
|
|
nsCOMPtr<nsIChannel> channel;
|
|
// Note that we are calling NS_NewChannelWithTriggeringPrincipal() with both
|
|
// a node and a principal.
|
|
// This is because of a case where the node is the document being styled and
|
|
// the principal is the stylesheet (perhaps from a different origin) that is
|
|
// applying the styles.
|
|
if (aLoadData->mRequestingNode && aLoadData->mLoaderPrincipal) {
|
|
rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(channel),
|
|
aLoadData->mURI,
|
|
aLoadData->mRequestingNode,
|
|
aLoadData->mLoaderPrincipal,
|
|
securityFlags,
|
|
contentPolicyType);
|
|
} else {
|
|
// either we are loading something inside a document, in which case
|
|
// we should always have a requestingNode, or we are loading something
|
|
// outside a document, in which case the loadingPrincipal and the
|
|
// triggeringPrincipal should always be the systemPrincipal.
|
|
auto result = URLPreloader::ReadURI(aLoadData->mURI);
|
|
if (result.isOk()) {
|
|
nsCOMPtr<nsIInputStream> stream;
|
|
MOZ_TRY(NS_NewCStringInputStream(getter_AddRefs(stream), result.unwrap()));
|
|
|
|
rv = NS_NewInputStreamChannel(getter_AddRefs(channel),
|
|
aLoadData->mURI,
|
|
stream.forget(),
|
|
nsContentUtils::GetSystemPrincipal(),
|
|
securityFlags,
|
|
contentPolicyType);
|
|
} else {
|
|
rv = NS_NewChannel(getter_AddRefs(channel),
|
|
aLoadData->mURI,
|
|
nsContentUtils::GetSystemPrincipal(),
|
|
securityFlags,
|
|
contentPolicyType);
|
|
}
|
|
}
|
|
if (NS_FAILED(rv)) {
|
|
LOG_ERROR((" Failed to create channel"));
|
|
SheetComplete(aLoadData, rv);
|
|
return rv;
|
|
}
|
|
|
|
nsCOMPtr<nsIInputStream> stream;
|
|
rv = channel->Open2(getter_AddRefs(stream));
|
|
|
|
if (NS_FAILED(rv)) {
|
|
LOG_ERROR((" Failed to open URI synchronously"));
|
|
SheetComplete(aLoadData, rv);
|
|
return rv;
|
|
}
|
|
|
|
// Force UA sheets to be UTF-8.
|
|
// XXX this is only necessary because the default in
|
|
// SheetLoadData::OnDetermineCharset is wrong (bug 521039).
|
|
channel->SetContentCharset(NS_LITERAL_CSTRING("UTF-8"));
|
|
|
|
// Manually feed the streamloader the contents of the stream.
|
|
// This will call back into OnStreamComplete
|
|
// and thence to ParseSheet. Regardless of whether this fails,
|
|
// SheetComplete has been called.
|
|
return nsSyncLoadService::PushSyncStreamToListener(stream.forget(),
|
|
streamLoader,
|
|
channel);
|
|
}
|
|
|
|
SheetLoadData* existingData = nullptr;
|
|
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI,
|
|
aLoadData->mLoaderPrincipal,
|
|
aLoadData->mSheet->GetCORSMode(),
|
|
aLoadData->mSheet->GetReferrerPolicy());
|
|
if (aSheetState == eSheetLoading) {
|
|
mSheets->mLoadingDatas.Get(&key, &existingData);
|
|
NS_ASSERTION(existingData, "CreateSheet lied about the state");
|
|
} else if (aSheetState == eSheetPending) {
|
|
mSheets->mPendingDatas.Get(&key, &existingData);
|
|
NS_ASSERTION(existingData, "CreateSheet lied about the state");
|
|
}
|
|
|
|
if (existingData) {
|
|
LOG((" Glomming on to existing load"));
|
|
SheetLoadData* data = existingData;
|
|
while (data->mNext) {
|
|
data = data->mNext;
|
|
}
|
|
data->mNext = aLoadData; // transfer ownership
|
|
if (aSheetState == eSheetPending && !aLoadData->ShouldDefer()) {
|
|
// Kick the load off; someone cares about it right away
|
|
|
|
#ifdef DEBUG
|
|
SheetLoadData* removedData;
|
|
NS_ASSERTION(mSheets->mPendingDatas.Get(&key, &removedData) &&
|
|
removedData == existingData,
|
|
"Bad pending table.");
|
|
#endif
|
|
|
|
mSheets->mPendingDatas.Remove(&key);
|
|
|
|
LOG((" Forcing load of pending data"));
|
|
return LoadSheet(existingData, eSheetNeedsParser, aIsPreload);
|
|
}
|
|
// All done here; once the load completes we'll be marked complete
|
|
// automatically
|
|
return NS_OK;
|
|
}
|
|
|
|
nsCOMPtr<nsILoadGroup> loadGroup;
|
|
if (mDocument) {
|
|
loadGroup = mDocument->GetDocumentLoadGroup();
|
|
// load for a document with no loadgrup indicates that something is
|
|
// completely bogus, let's bail out early.
|
|
if (!loadGroup) {
|
|
LOG_ERROR((" Failed to query loadGroup from document"));
|
|
SheetComplete(aLoadData, NS_ERROR_UNEXPECTED);
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
mSyncCallback = true;
|
|
#endif
|
|
|
|
CORSMode ourCORSMode = aLoadData->mSheet->GetCORSMode();
|
|
nsSecurityFlags securityFlags =
|
|
ourCORSMode == CORS_NONE
|
|
? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS
|
|
: nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
|
|
if (ourCORSMode == CORS_ANONYMOUS) {
|
|
securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
|
|
} else if (ourCORSMode == CORS_USE_CREDENTIALS) {
|
|
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
|
|
}
|
|
securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME;
|
|
|
|
nsContentPolicyType contentPolicyType =
|
|
aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD
|
|
: nsIContentPolicy::TYPE_INTERNAL_STYLESHEET;
|
|
|
|
nsCOMPtr<nsIChannel> channel;
|
|
// Note we are calling NS_NewChannelWithTriggeringPrincipal here with a node
|
|
// and a principal. This is because of a case where the node is the document
|
|
// being styled and the principal is the stylesheet (perhaps from a different
|
|
// origin) that is applying the styles.
|
|
if (aLoadData->mRequestingNode && aLoadData->mLoaderPrincipal) {
|
|
rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(channel),
|
|
aLoadData->mURI,
|
|
aLoadData->mRequestingNode,
|
|
aLoadData->mLoaderPrincipal,
|
|
securityFlags,
|
|
contentPolicyType,
|
|
nullptr, // Performancestorage
|
|
loadGroup,
|
|
nullptr, // aCallbacks
|
|
nsIChannel::LOAD_NORMAL |
|
|
nsIChannel::LOAD_CLASSIFY_URI);
|
|
}
|
|
else {
|
|
// either we are loading something inside a document, in which case
|
|
// we should always have a requestingNode, or we are loading something
|
|
// outside a document, in which case the loadingPrincipal and the
|
|
// triggeringPrincipal should always be the systemPrincipal.
|
|
rv = NS_NewChannel(getter_AddRefs(channel),
|
|
aLoadData->mURI,
|
|
nsContentUtils::GetSystemPrincipal(),
|
|
securityFlags,
|
|
contentPolicyType,
|
|
nullptr, // aPerformanceStorage
|
|
loadGroup,
|
|
nullptr, // aCallbacks
|
|
nsIChannel::LOAD_NORMAL |
|
|
nsIChannel::LOAD_CLASSIFY_URI);
|
|
}
|
|
|
|
if (NS_FAILED(rv)) {
|
|
#ifdef DEBUG
|
|
mSyncCallback = false;
|
|
#endif
|
|
LOG_ERROR((" Failed to create channel"));
|
|
SheetComplete(aLoadData, rv);
|
|
return rv;
|
|
}
|
|
|
|
if (!aLoadData->ShouldDefer()) {
|
|
nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel));
|
|
if (cos) {
|
|
cos->AddClassFlags(nsIClassOfService::Leader);
|
|
}
|
|
}
|
|
|
|
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
|
|
if (httpChannel) {
|
|
// Send a minimal Accept header for text/css
|
|
rv = httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
|
|
NS_LITERAL_CSTRING("text/css,*/*;q=0.1"),
|
|
false);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
nsCOMPtr<nsIURI> referrerURI = aLoadData->GetReferrerURI();
|
|
if (referrerURI) {
|
|
rv = httpChannel->SetReferrerWithPolicy(referrerURI,
|
|
aLoadData->mSheet->GetReferrerPolicy());
|
|
Unused << NS_WARN_IF(NS_FAILED(rv));
|
|
}
|
|
|
|
nsCOMPtr<nsIHttpChannelInternal> internalChannel = do_QueryInterface(httpChannel);
|
|
if (internalChannel) {
|
|
rv = internalChannel->SetIntegrityMetadata(sriMetadata.GetIntegrityString());
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
|
|
// Set the initiator type
|
|
nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChannel));
|
|
if (timedChannel) {
|
|
if (aLoadData->mParentData) {
|
|
timedChannel->SetInitiatorType(NS_LITERAL_STRING("css"));
|
|
|
|
// This is a child sheet load.
|
|
//
|
|
// The resource timing of the sub-resources that a document loads
|
|
// should normally be reported to the document. One exception is any
|
|
// sub-resources of any cross-origin resources that are loaded. We
|
|
// don't mind reporting timing data for a direct child cross-origin
|
|
// resource since the resource that linked to it (and hence potentially
|
|
// anything in that parent origin) is aware that the cross-origin
|
|
// resources is to be loaded. However, we do not want to report
|
|
// timings for any sub-resources that a cross-origin resource may load
|
|
// since that obviously leaks information about what the cross-origin
|
|
// resource loads, which is bad.
|
|
//
|
|
// In addition to checking whether we're an immediate child resource of
|
|
// a cross-origin resource (by checking if mIsCrossOriginNoCORS is set
|
|
// to true on our parent), we also check our parent to see whether it
|
|
// itself is a sub-resource of a cross-origin resource by checking
|
|
// mBlockResourceTiming. If that is set then we too are such a
|
|
// sub-resource and so we set the flag on ourself too to propagate it
|
|
// on down.
|
|
//
|
|
if (aLoadData->mParentData->mIsCrossOriginNoCORS ||
|
|
aLoadData->mParentData->mBlockResourceTiming) {
|
|
// Set a flag so any other stylesheet triggered by this one will
|
|
// not be reported
|
|
aLoadData->mBlockResourceTiming = true;
|
|
|
|
// Mark the channel so PerformanceMainThread::AddEntry will not
|
|
// report the resource.
|
|
timedChannel->SetReportResourceTiming(false);
|
|
}
|
|
|
|
} else {
|
|
timedChannel->SetInitiatorType(NS_LITERAL_STRING("link"));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now tell the channel we expect text/css data back.... We do
|
|
// this before opening it, so it's only treated as a hint.
|
|
channel->SetContentType(NS_LITERAL_CSTRING("text/css"));
|
|
|
|
// We don't have to hold on to the stream loader. The ownership
|
|
// model is: Necko owns the stream loader, which owns the load data,
|
|
// which owns us
|
|
nsCOMPtr<nsIStreamListener> streamLoader = new StreamLoader(aLoadData);
|
|
|
|
if (mDocument) {
|
|
mozilla::net::PredictorLearn(aLoadData->mURI, mDocument->GetDocumentURI(),
|
|
nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE,
|
|
mDocument);
|
|
}
|
|
|
|
rv = channel->AsyncOpen2(streamLoader);
|
|
|
|
#ifdef DEBUG
|
|
mSyncCallback = false;
|
|
#endif
|
|
|
|
if (NS_FAILED(rv)) {
|
|
LOG_ERROR((" Failed to create stream loader"));
|
|
SheetComplete(aLoadData, rv);
|
|
return rv;
|
|
}
|
|
|
|
mSheets->mLoadingDatas.Put(&key, aLoadData);
|
|
aLoadData->mIsLoading = true;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* ParseSheet handles parsing the data stream.
|
|
*/
|
|
Loader::Completed
|
|
Loader::ParseSheet(const nsACString& aBytes,
|
|
SheetLoadData* aLoadData,
|
|
AllowAsyncParse aAllowAsync)
|
|
{
|
|
LOG(("css::Loader::ParseSheet"));
|
|
MOZ_ASSERT(aLoadData);
|
|
aLoadData->mIsBeingParsed = true;
|
|
|
|
StyleSheet* sheet = aLoadData->mSheet;
|
|
MOZ_ASSERT(sheet);
|
|
|
|
// Some cases, like inline style and UA stylesheets, need to be parsed
|
|
// synchronously. The former may trigger child loads, the latter must not.
|
|
if (aLoadData->mSyncLoad || aAllowAsync == AllowAsyncParse::No) {
|
|
sheet->ParseSheetSync(this, aBytes, aLoadData, aLoadData->mLineNumber);
|
|
aLoadData->mIsBeingParsed = false;
|
|
|
|
bool noPendingChildren = aLoadData->mPendingChildren == 0;
|
|
MOZ_ASSERT_IF(aLoadData->mSyncLoad, noPendingChildren);
|
|
if (noPendingChildren) {
|
|
SheetComplete(aLoadData, NS_OK);
|
|
return Completed::Yes;
|
|
}
|
|
return Completed::No;
|
|
}
|
|
|
|
// This parse does not need to be synchronous. \o/
|
|
//
|
|
// Note that we need to block onload because there may be no network requests
|
|
// pending.
|
|
BlockOnload();
|
|
RefPtr<SheetLoadData> loadData = aLoadData;
|
|
nsCOMPtr<nsISerialEventTarget> target = DispatchTarget();
|
|
sheet->ParseSheet(this, aBytes, aLoadData)->Then(target, __func__,
|
|
[loadData = std::move(loadData)](bool aDummy) {
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
loadData->mIsBeingParsed = false;
|
|
loadData->mLoader->UnblockOnload(/* aFireSync = */ false);
|
|
// If there are no child sheets outstanding, mark us as complete.
|
|
// Otherwise, the children are holding strong refs to the data and
|
|
// will call SheetComplete() on it when they complete.
|
|
if (loadData->mPendingChildren == 0) {
|
|
loadData->mLoader->SheetComplete(loadData, NS_OK);
|
|
}
|
|
}, [] { MOZ_CRASH("rejected parse promise"); }
|
|
);
|
|
return Completed::No;
|
|
}
|
|
|
|
/**
|
|
* SheetComplete is the do-it-all cleanup function. It removes the
|
|
* load data from the "loading" hashtable, adds the sheet to the
|
|
* "completed" hashtable, massages the XUL cache, handles siblings of
|
|
* the load data (other loads for the same URI), handles unblocking
|
|
* blocked parent loads as needed, and most importantly calls
|
|
* NS_RELEASE on the load data to destroy the whole mess.
|
|
*/
|
|
void
|
|
Loader::SheetComplete(SheetLoadData* aLoadData, nsresult aStatus)
|
|
{
|
|
LOG(("css::Loader::SheetComplete, status: 0x%" PRIx32, static_cast<uint32_t>(aStatus)));
|
|
|
|
// If aStatus is a failure we need to mark this data failed. We also need to
|
|
// mark any ancestors of a failing data as failed and any sibling of a
|
|
// failing data as failed. Note that SheetComplete is never called on a
|
|
// SheetLoadData that is the mNext of some other SheetLoadData.
|
|
if (NS_FAILED(aStatus)) {
|
|
MarkLoadTreeFailed(aLoadData);
|
|
}
|
|
|
|
// 8 is probably big enough for all our common cases. It's not likely that
|
|
// imports will nest more than 8 deep, and multiple sheets with the same URI
|
|
// are rare.
|
|
AutoTArray<RefPtr<SheetLoadData>, 8> datasToNotify;
|
|
DoSheetComplete(aLoadData, datasToNotify);
|
|
|
|
// Now it's safe to go ahead and notify observers
|
|
uint32_t count = datasToNotify.Length();
|
|
mDatasToNotifyOn += count;
|
|
for (uint32_t i = 0; i < count; ++i) {
|
|
--mDatasToNotifyOn;
|
|
|
|
SheetLoadData* data = datasToNotify[i];
|
|
NS_ASSERTION(data && data->mMustNotify, "How did this data get here?");
|
|
if (data->mObserver) {
|
|
LOG((" Notifying observer %p for data %p. wasAlternate: %d",
|
|
data->mObserver.get(), data, data->mWasAlternate));
|
|
data->mObserver->StyleSheetLoaded(data->mSheet, data->ShouldDefer(),
|
|
aStatus);
|
|
}
|
|
|
|
nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver> >::ForwardIterator iter(mObservers);
|
|
nsCOMPtr<nsICSSLoaderObserver> obs;
|
|
while (iter.HasMore()) {
|
|
obs = iter.GetNext();
|
|
LOG((" Notifying global observer %p for data %p. wasAlternate: %d",
|
|
obs.get(), data, data->mWasAlternate));
|
|
obs->StyleSheetLoaded(data->mSheet, data->mWasAlternate, aStatus);
|
|
}
|
|
}
|
|
|
|
if (mSheets->mLoadingDatas.Count() == 0 && mSheets->mPendingDatas.Count() > 0) {
|
|
LOG((" No more loading sheets; starting deferred loads"));
|
|
StartDeferredLoads();
|
|
}
|
|
}
|
|
|
|
void
|
|
Loader::DoSheetComplete(SheetLoadData* aLoadData, LoadDataArray& aDatasToNotify)
|
|
{
|
|
LOG(("css::Loader::DoSheetComplete"));
|
|
MOZ_ASSERT(aLoadData, "Must have a load data!");
|
|
MOZ_ASSERT(aLoadData->mSheet, "Must have a sheet");
|
|
NS_ASSERTION(mSheets, "mLoadingDatas should be initialized by now.");
|
|
|
|
// Twiddle the hashtables
|
|
if (aLoadData->mURI) {
|
|
LOG_URI(" Finished loading: '%s'", aLoadData->mURI);
|
|
// Remove the data from the list of loading datas
|
|
if (aLoadData->mIsLoading) {
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI,
|
|
aLoadData->mLoaderPrincipal,
|
|
aLoadData->mSheet->GetCORSMode(),
|
|
aLoadData->mSheet->GetReferrerPolicy());
|
|
#ifdef DEBUG
|
|
SheetLoadData *loadingData;
|
|
NS_ASSERTION(
|
|
mSheets->mLoadingDatas.Get(&key, &loadingData) &&
|
|
loadingData == aLoadData,
|
|
"Bad loading table");
|
|
#endif
|
|
|
|
mSheets->mLoadingDatas.Remove(&key);
|
|
aLoadData->mIsLoading = false;
|
|
}
|
|
}
|
|
|
|
// Go through and deal with the whole linked list.
|
|
SheetLoadData* data = aLoadData;
|
|
while (data) {
|
|
if (!data->mSheetAlreadyComplete) {
|
|
// If mSheetAlreadyComplete, then the sheet could well be modified between
|
|
// when we posted the async call to SheetComplete and now, since the sheet
|
|
// was page-accessible during that whole time.
|
|
MOZ_ASSERT(!data->mSheet->HasForcedUniqueInner(),
|
|
"should not get a forced unique inner during parsing");
|
|
data->mSheet->SetComplete();
|
|
data->ScheduleLoadEventIfNeeded();
|
|
}
|
|
if (data->mMustNotify && (data->mObserver || !mObservers.IsEmpty())) {
|
|
// Don't notify here so we don't trigger script. Remember the
|
|
// info we need to notify, then do it later when it's safe.
|
|
aDatasToNotify.AppendElement(data);
|
|
|
|
// On append failure, just press on. We'll fail to notify the observer,
|
|
// but not much we can do about that....
|
|
}
|
|
|
|
NS_ASSERTION(!data->mParentData ||
|
|
data->mParentData->mPendingChildren != 0,
|
|
"Broken pending child count on our parent");
|
|
|
|
// If we have a parent, our parent is no longer being parsed, and
|
|
// we are the last pending child, then our load completion
|
|
// completes the parent too. Note that the parent _can_ still be
|
|
// being parsed (eg if the child (us) failed to open the channel
|
|
// or some such).
|
|
if (data->mParentData &&
|
|
--(data->mParentData->mPendingChildren) == 0 &&
|
|
!data->mParentData->mIsBeingParsed) {
|
|
DoSheetComplete(data->mParentData, aDatasToNotify);
|
|
}
|
|
|
|
data = data->mNext;
|
|
}
|
|
|
|
// Now that it's marked complete, put the sheet in our cache.
|
|
// If we ever start doing this for failed loads, we'll need to
|
|
// adjust the PostLoadEvent code that thinks anything already
|
|
// complete must have loaded succesfully.
|
|
if (!aLoadData->mLoadFailed && aLoadData->mURI) {
|
|
// Pick our sheet to cache carefully. Ideally, we want to cache
|
|
// one of the sheets that will be kept alive by a document or
|
|
// parent sheet anyway, so that if someone then accesses it via
|
|
// CSSOM we won't have extra clones of the inner lying around.
|
|
data = aLoadData;
|
|
StyleSheet* sheet = aLoadData->mSheet;
|
|
while (data) {
|
|
if (data->mSheet->GetParentSheet() || data->mSheet->GetOwnerNode()) {
|
|
sheet = data->mSheet;
|
|
break;
|
|
}
|
|
data = data->mNext;
|
|
}
|
|
#ifdef MOZ_XUL
|
|
if (IsChromeURI(aLoadData->mURI)) {
|
|
nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
|
|
if (cache && cache->IsEnabled()) {
|
|
if (!cache->GetStyleSheet(aLoadData->mURI)) {
|
|
LOG((" Putting sheet in XUL prototype cache"));
|
|
NS_ASSERTION(sheet->IsComplete(),
|
|
"Should only be caching complete sheets");
|
|
cache->PutStyleSheet(sheet);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
#endif
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI,
|
|
aLoadData->mLoaderPrincipal,
|
|
aLoadData->mSheet->GetCORSMode(),
|
|
aLoadData->mSheet->GetReferrerPolicy());
|
|
NS_ASSERTION(sheet->IsComplete(),
|
|
"Should only be caching complete sheets");
|
|
mSheets->mCompleteSheets.Put(&key, sheet);
|
|
#ifdef MOZ_XUL
|
|
}
|
|
#endif
|
|
}
|
|
|
|
NS_RELEASE(aLoadData); // this will release parents and siblings and all that
|
|
}
|
|
|
|
void
|
|
Loader::MarkLoadTreeFailed(SheetLoadData* aLoadData)
|
|
{
|
|
if (aLoadData->mURI) {
|
|
LOG_URI(" Load failed: '%s'", aLoadData->mURI);
|
|
}
|
|
|
|
do {
|
|
aLoadData->mLoadFailed = true;
|
|
|
|
if (aLoadData->mParentData) {
|
|
MarkLoadTreeFailed(aLoadData->mParentData);
|
|
}
|
|
|
|
aLoadData = aLoadData->mNext;
|
|
} while (aLoadData);
|
|
}
|
|
|
|
Result<Loader::LoadSheetResult, nsresult>
|
|
Loader::LoadInlineStyle(const SheetInfo& aInfo,
|
|
const nsAString& aBuffer,
|
|
uint32_t aLineNumber,
|
|
nsICSSLoaderObserver* aObserver)
|
|
{
|
|
LOG(("css::Loader::LoadInlineStyle"));
|
|
|
|
if (!mEnabled) {
|
|
LOG_WARN((" Not enabled"));
|
|
return Err(NS_ERROR_NOT_AVAILABLE);
|
|
}
|
|
|
|
if (!mDocument) {
|
|
return Err(NS_ERROR_NOT_INITIALIZED);
|
|
}
|
|
|
|
nsCOMPtr<nsIStyleSheetLinkingElement> owningElement(
|
|
do_QueryInterface(aInfo.mContent));
|
|
NS_ASSERTION(owningElement, "Element is not a style linking element!");
|
|
|
|
// Since we're not planning to load a URI, no need to hand a principal to the
|
|
// load data or to CreateSheet().
|
|
|
|
// Check IsAlternateSheet now, since it can mutate our document.
|
|
auto isAlternate = IsAlternateSheet(aInfo.mTitle, aInfo.mHasAlternateRel);
|
|
|
|
StyleSheetState state;
|
|
RefPtr<StyleSheet> sheet;
|
|
nsresult rv = CreateSheet(aInfo,
|
|
nullptr,
|
|
eAuthorSheetFeatures,
|
|
false,
|
|
state,
|
|
&sheet);
|
|
if (NS_FAILED(rv)) {
|
|
return Err(rv);
|
|
}
|
|
NS_ASSERTION(state == eSheetNeedsParser,
|
|
"Inline sheets should not be cached");
|
|
|
|
LOG((" Sheet is alternate: %d", static_cast<int>(isAlternate)));
|
|
|
|
auto matched =
|
|
PrepareSheet(sheet, aInfo.mTitle, aInfo.mMedia, nullptr, isAlternate);
|
|
|
|
InsertSheetInTree(*sheet, aInfo.mContent);
|
|
|
|
nsIPrincipal* principal = aInfo.mContent->NodePrincipal();
|
|
if (aInfo.mTriggeringPrincipal) {
|
|
// The triggering principal may be an expanded principal, which is safe to
|
|
// use for URL security checks, but not as the loader principal for a
|
|
// stylesheet. So treat this as principal inheritance, and downgrade if
|
|
// necessary.
|
|
principal =
|
|
BasePrincipal::Cast(aInfo.mTriggeringPrincipal)->PrincipalToInherit();
|
|
}
|
|
|
|
SheetLoadData* data = new SheetLoadData(this,
|
|
aInfo.mTitle,
|
|
nullptr,
|
|
sheet,
|
|
owningElement,
|
|
isAlternate,
|
|
matched,
|
|
aObserver,
|
|
nullptr,
|
|
aInfo.mContent);
|
|
|
|
// We never actually load this, so just set its principal directly
|
|
sheet->SetPrincipal(principal);
|
|
|
|
NS_ADDREF(data);
|
|
data->mLineNumber = aLineNumber;
|
|
// Parse completion releases the load data.
|
|
//
|
|
// Note that we need to parse synchronously, since the web expects that the
|
|
// effects of inline stylesheets are visible immediately (aside from
|
|
// @imports).
|
|
NS_ConvertUTF16toUTF8 utf8(aBuffer);
|
|
Completed completed = ParseSheet(utf8, data, AllowAsyncParse::No);
|
|
|
|
// If the sheet is complete already, |data| may well be deleted by now.
|
|
if (completed == Completed::No) {
|
|
data->mMustNotify = true;
|
|
}
|
|
return LoadSheetResult { completed, isAlternate, matched };
|
|
}
|
|
|
|
Result<Loader::LoadSheetResult, nsresult>
|
|
Loader::LoadStyleLink(const SheetInfo& aInfo, nsICSSLoaderObserver* aObserver)
|
|
{
|
|
MOZ_ASSERT(aInfo.mURI, "Must have URL to load");
|
|
LOG(("css::Loader::LoadStyleLink"));
|
|
LOG_URI(" Link uri: '%s'", aInfo.mURI);
|
|
LOG((" Link title: '%s'", NS_ConvertUTF16toUTF8(aInfo.mTitle).get()));
|
|
LOG((" Link media: '%s'", NS_ConvertUTF16toUTF8(aInfo.mMedia).get()));
|
|
LOG((" Link alternate rel: %d", aInfo.mHasAlternateRel));
|
|
|
|
if (!mEnabled) {
|
|
LOG_WARN((" Not enabled"));
|
|
return Err(NS_ERROR_NOT_AVAILABLE);
|
|
}
|
|
|
|
if (!mDocument) {
|
|
return Err(NS_ERROR_NOT_INITIALIZED);
|
|
}
|
|
|
|
nsIPrincipal* loadingPrincipal = aInfo.mContent
|
|
? aInfo.mContent->NodePrincipal()
|
|
: mDocument->NodePrincipal();
|
|
|
|
nsIPrincipal* principal = aInfo.mTriggeringPrincipal
|
|
? aInfo.mTriggeringPrincipal.get()
|
|
: loadingPrincipal;
|
|
|
|
nsINode* context = aInfo.mContent;
|
|
if (!context) {
|
|
context = mDocument;
|
|
}
|
|
|
|
nsresult rv = CheckContentPolicy(loadingPrincipal, principal, aInfo.mURI, context, false);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
// Don't fire the error event if our document is loaded as data. We're
|
|
// supposed to not even try to do loads in that case... Unfortunately, we
|
|
// implement that via nsDataDocumentContentPolicy, which doesn't have a good
|
|
// way to communicate back to us that _it_ is the thing that blocked the
|
|
// load.
|
|
if (aInfo.mContent && !mDocument->IsLoadedAsData()) {
|
|
// Fire an async error event on it.
|
|
RefPtr<AsyncEventDispatcher> loadBlockingAsyncDispatcher =
|
|
new LoadBlockingAsyncEventDispatcher(aInfo.mContent,
|
|
NS_LITERAL_STRING("error"),
|
|
CanBubble::eNo,
|
|
ChromeOnlyDispatch::eNo);
|
|
loadBlockingAsyncDispatcher->PostDOMEvent();
|
|
}
|
|
return Err(rv);
|
|
}
|
|
|
|
StyleSheetState state;
|
|
RefPtr<StyleSheet> sheet;
|
|
auto isAlternate = IsAlternateSheet(aInfo.mTitle, aInfo.mHasAlternateRel);
|
|
rv = CreateSheet(aInfo,
|
|
principal,
|
|
eAuthorSheetFeatures,
|
|
false,
|
|
state,
|
|
&sheet);
|
|
if (NS_FAILED(rv)) {
|
|
return Err(rv);
|
|
}
|
|
|
|
LOG((" Sheet is alternate: %d", static_cast<int>(isAlternate)));
|
|
|
|
auto matched =
|
|
PrepareSheet(sheet, aInfo.mTitle, aInfo.mMedia, nullptr, isAlternate);
|
|
|
|
InsertSheetInTree(*sheet, aInfo.mContent);
|
|
|
|
nsCOMPtr<nsIStyleSheetLinkingElement> owningElement(
|
|
do_QueryInterface(aInfo.mContent));
|
|
|
|
if (state == eSheetComplete) {
|
|
LOG((" Sheet already complete: 0x%p", sheet.get()));
|
|
if (aObserver || !mObservers.IsEmpty() || owningElement) {
|
|
rv = PostLoadEvent(aInfo.mURI,
|
|
sheet,
|
|
aObserver,
|
|
isAlternate,
|
|
matched,
|
|
owningElement);
|
|
if (NS_FAILED(rv)) {
|
|
return Err(rv);
|
|
}
|
|
}
|
|
|
|
// The load hasn't been completed yet, will be done in PostLoadEvent.
|
|
return LoadSheetResult { Completed::No, isAlternate, matched };
|
|
}
|
|
|
|
// Now we need to actually load it.
|
|
SheetLoadData* data = new SheetLoadData(this,
|
|
aInfo.mTitle,
|
|
aInfo.mURI,
|
|
sheet,
|
|
owningElement,
|
|
isAlternate,
|
|
matched,
|
|
aObserver,
|
|
principal,
|
|
context);
|
|
NS_ADDREF(data);
|
|
|
|
auto result = LoadSheetResult { Completed::No, isAlternate, matched };
|
|
|
|
MOZ_ASSERT(result.ShouldBlock() == !data->ShouldDefer(),
|
|
"These should better match!");
|
|
|
|
// If we have to parse and it's a non-blocking non-inline sheet, defer it.
|
|
if (state == eSheetNeedsParser &&
|
|
mSheets->mLoadingDatas.Count() != 0 &&
|
|
!result.ShouldBlock()) {
|
|
LOG((" Deferring sheet load"));
|
|
URIPrincipalReferrerPolicyAndCORSModeHashKey key(data->mURI,
|
|
data->mLoaderPrincipal,
|
|
data->mSheet->GetCORSMode(),
|
|
data->mSheet->GetReferrerPolicy());
|
|
mSheets->mPendingDatas.Put(&key, data);
|
|
|
|
data->mMustNotify = true;
|
|
return result;
|
|
}
|
|
|
|
// Load completion will free the data
|
|
rv = LoadSheet(data, state, false);
|
|
if (NS_FAILED(rv)) {
|
|
return Err(rv);
|
|
}
|
|
|
|
data->mMustNotify = true;
|
|
return result;
|
|
}
|
|
|
|
static bool
|
|
HaveAncestorDataWithURI(SheetLoadData *aData, nsIURI *aURI)
|
|
{
|
|
if (!aData->mURI) {
|
|
// Inline style; this won't have any ancestors
|
|
MOZ_ASSERT(!aData->mParentData,
|
|
"How does inline style have a parent?");
|
|
return false;
|
|
}
|
|
|
|
bool equal;
|
|
if (NS_FAILED(aData->mURI->Equals(aURI, &equal)) || equal) {
|
|
return true;
|
|
}
|
|
|
|
// Datas down the mNext chain have the same URI as aData, so we
|
|
// don't have to compare to them. But they might have different
|
|
// parents, and we have to check all of those.
|
|
while (aData) {
|
|
if (aData->mParentData &&
|
|
HaveAncestorDataWithURI(aData->mParentData, aURI)) {
|
|
return true;
|
|
}
|
|
|
|
aData = aData->mNext;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
nsresult
|
|
Loader::LoadChildSheet(StyleSheet* aParentSheet,
|
|
SheetLoadData* aParentData,
|
|
nsIURI* aURL,
|
|
dom::MediaList* aMedia,
|
|
LoaderReusableStyleSheets* aReusableSheets)
|
|
{
|
|
LOG(("css::Loader::LoadChildSheet"));
|
|
MOZ_ASSERT(aURL, "Must have a URI to load");
|
|
MOZ_ASSERT(aParentSheet, "Must have a parent sheet");
|
|
|
|
if (!mEnabled) {
|
|
LOG_WARN((" Not enabled"));
|
|
return NS_ERROR_NOT_AVAILABLE;
|
|
}
|
|
|
|
LOG_URI(" Child uri: '%s'", aURL);
|
|
|
|
nsCOMPtr<nsINode> owningNode;
|
|
|
|
// Check for an associated document or shadow root: if none, don't bother
|
|
// walking up the parent sheets.
|
|
if (aParentSheet->GetAssociatedDocumentOrShadowRoot()) {
|
|
StyleSheet* topSheet = aParentSheet;
|
|
while (StyleSheet* parent = topSheet->GetParentSheet()) {
|
|
topSheet = parent;
|
|
}
|
|
owningNode = topSheet->GetOwnerNode();
|
|
}
|
|
|
|
nsINode* context = nullptr;
|
|
nsIPrincipal* loadingPrincipal = nullptr;
|
|
if (owningNode) {
|
|
context = owningNode;
|
|
loadingPrincipal = owningNode->NodePrincipal();
|
|
} else if (mDocument) {
|
|
context = mDocument;
|
|
loadingPrincipal = mDocument->NodePrincipal();
|
|
}
|
|
|
|
nsIPrincipal* principal = aParentSheet->Principal();
|
|
nsresult rv = CheckContentPolicy(loadingPrincipal, principal, aURL, context, false);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
if (aParentData) {
|
|
MarkLoadTreeFailed(aParentData);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
nsCOMPtr<nsICSSLoaderObserver> observer;
|
|
|
|
if (aParentData) {
|
|
LOG((" Have a parent load"));
|
|
// Check for cycles
|
|
if (HaveAncestorDataWithURI(aParentData, aURL)) {
|
|
// Houston, we have a loop, blow off this child and pretend this never
|
|
// happened
|
|
LOG_ERROR((" @import cycle detected, dropping load"));
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_ASSERTION(aParentData->mSheet == aParentSheet,
|
|
"Unexpected call to LoadChildSheet");
|
|
} else {
|
|
LOG((" No parent load; must be CSSOM"));
|
|
// No parent load data, so the sheet will need to be notified when
|
|
// we finish, if it can be, if we do the load asynchronously.
|
|
observer = aParentSheet;
|
|
}
|
|
|
|
// Now that we know it's safe to load this (passes security check and not a
|
|
// loop) do so.
|
|
RefPtr<StyleSheet> sheet;
|
|
StyleSheetState state;
|
|
if (aReusableSheets && aReusableSheets->FindReusableStyleSheet(aURL, sheet)) {
|
|
state = eSheetComplete;
|
|
} else {
|
|
const nsAString& empty = EmptyString();
|
|
// For now, use CORS_NONE for child sheets
|
|
rv = CreateSheet(aURL,
|
|
nullptr,
|
|
principal,
|
|
aParentSheet->ParsingMode(),
|
|
CORS_NONE,
|
|
aParentSheet->GetReferrerPolicy(),
|
|
EmptyString(), // integrity is only checked on main sheet
|
|
aParentData ? aParentData->mSyncLoad : false,
|
|
state,
|
|
&sheet);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
PrepareSheet(sheet, empty, empty, aMedia, IsAlternate::No);
|
|
}
|
|
|
|
MOZ_ASSERT(sheet);
|
|
InsertChildSheet(*sheet, *aParentSheet);
|
|
|
|
if (state == eSheetComplete) {
|
|
LOG((" Sheet already complete"));
|
|
// We're completely done. No need to notify, even, since the
|
|
// @import rule addition/modification will trigger the right style
|
|
// changes automatically.
|
|
return NS_OK;
|
|
}
|
|
|
|
SheetLoadData* data = new SheetLoadData(this, aURL, sheet, aParentData,
|
|
observer, principal, context);
|
|
|
|
NS_ADDREF(data);
|
|
bool syncLoad = data->mSyncLoad;
|
|
|
|
// Load completion will release the data
|
|
rv = LoadSheet(data, state, false);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// If syncLoad is true, |data| will be deleted by now.
|
|
if (!syncLoad) {
|
|
data->mMustNotify = true;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
Loader::LoadSheetSync(nsIURI* aURL,
|
|
SheetParsingMode aParsingMode,
|
|
bool aUseSystemPrincipal,
|
|
RefPtr<StyleSheet>* aSheet)
|
|
{
|
|
LOG(("css::Loader::LoadSheetSync"));
|
|
return InternalLoadNonDocumentSheet(aURL,
|
|
false,
|
|
aParsingMode,
|
|
aUseSystemPrincipal,
|
|
nullptr,
|
|
nullptr,
|
|
aSheet,
|
|
nullptr);
|
|
}
|
|
|
|
nsresult
|
|
Loader::LoadSheet(nsIURI* aURL,
|
|
SheetParsingMode aParsingMode,
|
|
bool aUseSystemPrincipal,
|
|
nsICSSLoaderObserver* aObserver,
|
|
RefPtr<StyleSheet>* aSheet)
|
|
{
|
|
LOG(("css::Loader::LoadSheet(aURL, aParsingMode, aUseSystemPrincipal, aObserver, aSheet)"));
|
|
return InternalLoadNonDocumentSheet(aURL,
|
|
false,
|
|
aParsingMode,
|
|
aUseSystemPrincipal,
|
|
nullptr,
|
|
nullptr,
|
|
aSheet,
|
|
aObserver);
|
|
}
|
|
|
|
nsresult
|
|
Loader::LoadSheet(nsIURI* aURL,
|
|
nsIPrincipal* aOriginPrincipal,
|
|
nsICSSLoaderObserver* aObserver,
|
|
RefPtr<StyleSheet>* aSheet)
|
|
{
|
|
LOG(("css::Loader::LoadSheet(aURL, aObserver, aSheet) api call"));
|
|
MOZ_ASSERT(aSheet, "aSheet is null");
|
|
return InternalLoadNonDocumentSheet(aURL,
|
|
false,
|
|
eAuthorSheetFeatures,
|
|
false,
|
|
aOriginPrincipal,
|
|
nullptr,
|
|
aSheet,
|
|
aObserver);
|
|
}
|
|
|
|
nsresult
|
|
Loader::LoadSheet(nsIURI* aURL,
|
|
bool aIsPreload,
|
|
nsIPrincipal* aOriginPrincipal,
|
|
const Encoding* aPreloadEncoding,
|
|
nsICSSLoaderObserver* aObserver,
|
|
CORSMode aCORSMode,
|
|
ReferrerPolicy aReferrerPolicy,
|
|
const nsAString& aIntegrity)
|
|
{
|
|
LOG(("css::Loader::LoadSheet(aURL, aObserver) api call"));
|
|
return InternalLoadNonDocumentSheet(aURL,
|
|
aIsPreload,
|
|
eAuthorSheetFeatures,
|
|
false,
|
|
aOriginPrincipal,
|
|
aPreloadEncoding,
|
|
nullptr,
|
|
aObserver,
|
|
aCORSMode,
|
|
aReferrerPolicy,
|
|
aIntegrity);
|
|
}
|
|
|
|
nsresult
|
|
Loader::InternalLoadNonDocumentSheet(nsIURI* aURL,
|
|
bool aIsPreload,
|
|
SheetParsingMode aParsingMode,
|
|
bool aUseSystemPrincipal,
|
|
nsIPrincipal* aOriginPrincipal,
|
|
const Encoding* aPreloadEncoding,
|
|
RefPtr<StyleSheet>* aSheet,
|
|
nsICSSLoaderObserver* aObserver,
|
|
CORSMode aCORSMode,
|
|
ReferrerPolicy aReferrerPolicy,
|
|
const nsAString& aIntegrity)
|
|
{
|
|
MOZ_ASSERT(aURL, "Must have a URI to load");
|
|
MOZ_ASSERT(aSheet || aObserver, "Sheet and observer can't both be null");
|
|
MOZ_ASSERT(!aUseSystemPrincipal || !aObserver,
|
|
"Shouldn't load system-principal sheets async");
|
|
|
|
LOG_URI(" Non-document sheet uri: '%s'", aURL);
|
|
|
|
if (aSheet) {
|
|
*aSheet = nullptr;
|
|
}
|
|
|
|
if (!mEnabled) {
|
|
LOG_WARN((" Not enabled"));
|
|
return NS_ERROR_NOT_AVAILABLE;
|
|
}
|
|
|
|
nsCOMPtr<nsIPrincipal> loadingPrincipal = (aOriginPrincipal && mDocument
|
|
? mDocument->NodePrincipal()
|
|
: nullptr);
|
|
nsresult rv = CheckContentPolicy(loadingPrincipal, aOriginPrincipal,
|
|
aURL, mDocument, aIsPreload);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
StyleSheetState state;
|
|
RefPtr<StyleSheet> sheet;
|
|
bool syncLoad = (aObserver == nullptr);
|
|
const nsAString& empty = EmptyString();
|
|
rv = CreateSheet(aURL, nullptr, aOriginPrincipal, aParsingMode,
|
|
aCORSMode, aReferrerPolicy, aIntegrity, syncLoad,
|
|
state, &sheet);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
PrepareSheet(sheet, empty, empty, nullptr, IsAlternate::No);
|
|
|
|
if (state == eSheetComplete) {
|
|
LOG((" Sheet already complete"));
|
|
if (aObserver || !mObservers.IsEmpty()) {
|
|
rv = PostLoadEvent(aURL,
|
|
sheet,
|
|
aObserver,
|
|
IsAlternate::No,
|
|
MediaMatched::Yes,
|
|
nullptr);
|
|
}
|
|
if (aSheet) {
|
|
sheet.swap(*aSheet);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
SheetLoadData* data = new SheetLoadData(this,
|
|
aURL,
|
|
sheet,
|
|
syncLoad,
|
|
aUseSystemPrincipal,
|
|
aPreloadEncoding,
|
|
aObserver,
|
|
aOriginPrincipal,
|
|
mDocument);
|
|
|
|
NS_ADDREF(data);
|
|
rv = LoadSheet(data, state, aIsPreload);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (aSheet) {
|
|
sheet.swap(*aSheet);
|
|
}
|
|
if (aObserver) {
|
|
data->mMustNotify = true;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
Loader::PostLoadEvent(nsIURI* aURI,
|
|
StyleSheet* aSheet,
|
|
nsICSSLoaderObserver* aObserver,
|
|
IsAlternate aWasAlternate,
|
|
MediaMatched aMediaMatched,
|
|
nsIStyleSheetLinkingElement* aElement)
|
|
{
|
|
LOG(("css::Loader::PostLoadEvent"));
|
|
MOZ_ASSERT(aSheet, "Must have sheet");
|
|
MOZ_ASSERT(aObserver || !mObservers.IsEmpty() || aElement,
|
|
"Must have observer or element");
|
|
|
|
RefPtr<SheetLoadData> evt =
|
|
new SheetLoadData(this,
|
|
EmptyString(), // title doesn't matter here
|
|
aURI,
|
|
aSheet,
|
|
aElement,
|
|
aWasAlternate,
|
|
aMediaMatched,
|
|
aObserver,
|
|
nullptr,
|
|
mDocument);
|
|
|
|
if (!mPostedEvents.AppendElement(evt)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
nsresult rv;
|
|
RefPtr<SheetLoadData> runnable(evt);
|
|
if (mDocument) {
|
|
rv = mDocument->Dispatch(TaskCategory::Other, runnable.forget());
|
|
} else if (mDocGroup) {
|
|
rv = mDocGroup->Dispatch(TaskCategory::Other, runnable.forget());
|
|
} else {
|
|
rv = SystemGroup::Dispatch(TaskCategory::Other, runnable.forget());
|
|
}
|
|
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING("failed to dispatch stylesheet load event");
|
|
mPostedEvents.RemoveElement(evt);
|
|
} else {
|
|
// We'll unblock onload when we handle the event.
|
|
BlockOnload();
|
|
|
|
// We want to notify the observer for this data.
|
|
evt->mMustNotify = true;
|
|
evt->mSheetAlreadyComplete = true;
|
|
|
|
// If we get to this code, aSheet loaded correctly at some point, so
|
|
// we can just schedule a load event and don't need to touch the
|
|
// data's mLoadFailed. Note that we do this here and not from
|
|
// inside our SheetComplete so that we don't end up running the load
|
|
// event async.
|
|
MOZ_ASSERT(!evt->mLoadFailed, "Why are we marked as failed?");
|
|
evt->ScheduleLoadEventIfNeeded();
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
Loader::HandleLoadEvent(SheetLoadData* aEvent)
|
|
{
|
|
// XXXbz can't assert this yet.... May not have an observer because
|
|
// we're unblocking the parser
|
|
// NS_ASSERTION(aEvent->mObserver, "Must have observer");
|
|
NS_ASSERTION(aEvent->mSheet, "Must have sheet");
|
|
|
|
// Very important: this needs to come before the SheetComplete call
|
|
// below, so that HasPendingLoads() will test true as needed under
|
|
// notifications we send from that SheetComplete call.
|
|
mPostedEvents.RemoveElement(aEvent);
|
|
|
|
if (!aEvent->mIsCancelled) {
|
|
// SheetComplete will call Release(), so give it a reference to do
|
|
// that with.
|
|
NS_ADDREF(aEvent);
|
|
SheetComplete(aEvent, NS_OK);
|
|
}
|
|
|
|
UnblockOnload(true);
|
|
}
|
|
|
|
static void
|
|
StopLoadingSheets(
|
|
nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>& aDatas,
|
|
Loader::LoadDataArray& aArr)
|
|
{
|
|
for (auto iter = aDatas.Iter(); !iter.Done(); iter.Next()) {
|
|
SheetLoadData* data = iter.Data();
|
|
MOZ_ASSERT(data, "Must have a data!");
|
|
|
|
data->mIsLoading = false; // we will handle the removal right here
|
|
data->mIsCancelled = true;
|
|
|
|
aArr.AppendElement(data);
|
|
|
|
iter.Remove();
|
|
}
|
|
}
|
|
|
|
void
|
|
Loader::Stop()
|
|
{
|
|
uint32_t pendingCount = mSheets ? mSheets->mPendingDatas.Count() : 0;
|
|
uint32_t loadingCount = mSheets ? mSheets->mLoadingDatas.Count() : 0;
|
|
LoadDataArray arr(pendingCount + loadingCount + mPostedEvents.Length());
|
|
|
|
if (pendingCount) {
|
|
StopLoadingSheets(mSheets->mPendingDatas, arr);
|
|
}
|
|
if (loadingCount) {
|
|
StopLoadingSheets(mSheets->mLoadingDatas, arr);
|
|
}
|
|
|
|
for (RefPtr<SheetLoadData>& data : mPostedEvents) {
|
|
data->mIsCancelled = true;
|
|
// SheetComplete() calls Release(), so give this an extra ref.
|
|
NS_ADDREF(data.get());
|
|
// Move since we're about to get rid of the array below.
|
|
arr.AppendElement(std::move(data));
|
|
}
|
|
mPostedEvents.Clear();
|
|
|
|
mDatasToNotifyOn += arr.Length();
|
|
for (RefPtr<SheetLoadData>& data : arr) {
|
|
--mDatasToNotifyOn;
|
|
SheetComplete(data, NS_BINDING_ABORTED);
|
|
}
|
|
}
|
|
|
|
bool
|
|
Loader::HasPendingLoads()
|
|
{
|
|
return
|
|
(mSheets && mSheets->mLoadingDatas.Count() != 0) ||
|
|
(mSheets && mSheets->mPendingDatas.Count() != 0) ||
|
|
mPostedEvents.Length() != 0 ||
|
|
mDatasToNotifyOn != 0;
|
|
}
|
|
|
|
nsresult
|
|
Loader::AddObserver(nsICSSLoaderObserver* aObserver)
|
|
{
|
|
MOZ_ASSERT(aObserver, "Must have observer");
|
|
if (mObservers.AppendElementUnlessExists(aObserver)) {
|
|
return NS_OK;
|
|
}
|
|
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
void
|
|
Loader::RemoveObserver(nsICSSLoaderObserver* aObserver)
|
|
{
|
|
mObservers.RemoveElement(aObserver);
|
|
}
|
|
|
|
void
|
|
Loader::StartDeferredLoads()
|
|
{
|
|
MOZ_ASSERT(mSheets, "Don't call me!");
|
|
LoadDataArray arr(mSheets->mPendingDatas.Count());
|
|
for (auto iter = mSheets->mPendingDatas.Iter(); !iter.Done(); iter.Next()) {
|
|
arr.AppendElement(iter.Data());
|
|
iter.Remove();
|
|
}
|
|
|
|
mDatasToNotifyOn += arr.Length();
|
|
for (uint32_t i = 0; i < arr.Length(); ++i) {
|
|
--mDatasToNotifyOn;
|
|
LoadSheet(arr[i], eSheetNeedsParser, false);
|
|
}
|
|
}
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_CLASS(Loader)
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Loader)
|
|
if (tmp->mSheets) {
|
|
for (auto iter = tmp->mSheets->mCompleteSheets.Iter();
|
|
!iter.Done();
|
|
iter.Next()) {
|
|
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "Sheet cache nsCSSLoader");
|
|
cb.NoteXPCOMChild(iter.UserData());
|
|
}
|
|
}
|
|
nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver>>::ForwardIterator
|
|
it(tmp->mObservers);
|
|
while (it.HasMore()) {
|
|
ImplCycleCollectionTraverse(cb, it.GetNext(),
|
|
"mozilla::css::Loader.mObservers");
|
|
}
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Loader)
|
|
if (tmp->mSheets) {
|
|
tmp->mSheets->mCompleteSheets.Clear();
|
|
}
|
|
tmp->mObservers.Clear();
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Loader, AddRef)
|
|
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Loader, Release)
|
|
|
|
size_t
|
|
Loader::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
size_t n = aMallocSizeOf(this);
|
|
|
|
if (mSheets) {
|
|
n += mSheets->mCompleteSheets.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (auto iter = mSheets->mCompleteSheets.ConstIter();
|
|
!iter.Done();
|
|
iter.Next()) {
|
|
// If aSheet has a parent, then its parent will report it so we don't
|
|
// have to worry about it here. Likewise, if aSheet has an owning node,
|
|
// then the document that node is in will report it.
|
|
const StyleSheet* sheet = iter.UserData();
|
|
n += (sheet->GetOwnerNode() || sheet->GetParentSheet())
|
|
? 0
|
|
: sheet->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
}
|
|
n += mObservers.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
|
|
// Measurement of the following members may be added later if DMD finds it is
|
|
// worthwhile:
|
|
// - mLoadingDatas: transient, and should be small
|
|
// - mPendingDatas: transient, and should be small
|
|
// - mPostedEvents: transient, and should be small
|
|
//
|
|
// The following members aren't measured:
|
|
// - mDocument, because it's a weak backpointer
|
|
|
|
return n;
|
|
}
|
|
|
|
void
|
|
Loader::BlockOnload()
|
|
{
|
|
if (mDocument) {
|
|
mDocument->BlockOnload();
|
|
}
|
|
}
|
|
|
|
void
|
|
Loader::UnblockOnload(bool aFireSync)
|
|
{
|
|
if (mDocument) {
|
|
mDocument->UnblockOnload(aFireSync);
|
|
}
|
|
}
|
|
|
|
already_AddRefed<nsISerialEventTarget>
|
|
Loader::DispatchTarget()
|
|
{
|
|
nsCOMPtr<nsISerialEventTarget> target;
|
|
if (mDocument) {
|
|
target = mDocument->EventTargetFor(TaskCategory::Other);
|
|
} else if (mDocGroup) {
|
|
target = mDocGroup->EventTargetFor(TaskCategory::Other);
|
|
} else {
|
|
target = SystemGroup::EventTargetFor(TaskCategory::Other);
|
|
}
|
|
|
|
return target.forget();
|
|
}
|
|
|
|
} // namespace css
|
|
} // namespace mozilla
|