зеркало из https://github.com/mozilla/gecko-dev.git
642 строки
18 KiB
C++
642 строки
18 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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/*
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* A base class which implements nsIStyleSheetLinkingElement and can
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* be subclassed by various content nodes that want to load
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* stylesheets (<style>, <link>, processing instructions, etc).
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*/
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#include "nsStyleLinkElement.h"
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#include "mozilla/StyleSheet.h"
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#include "mozilla/StyleSheetInlines.h"
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#include "mozilla/css/Loader.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/FragmentOrElement.h"
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#include "mozilla/dom/HTMLLinkElement.h"
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#include "mozilla/dom/ShadowRoot.h"
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#include "mozilla/dom/SRILogHelper.h"
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#include "mozilla/Preferences.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIDOMComment.h"
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#include "nsIDOMNode.h"
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#include "nsUnicharUtils.h"
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#include "nsCRT.h"
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#include "nsXPCOMCIDInternal.h"
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#include "nsUnicharInputStream.h"
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#include "nsContentUtils.h"
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#include "nsStyleUtil.h"
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#include "nsQueryObject.h"
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#include "nsIContentPolicy.h"
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#include "nsMimeTypes.h"
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#include "imgLoader.h"
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#include "MediaContainerType.h"
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#include "DecoderDoctorDiagnostics.h"
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#include "DecoderTraits.h"
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#include "MediaList.h"
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#include "nsAttrValueInlines.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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nsStyleLinkElement::nsStyleLinkElement()
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: mDontLoadStyle(false)
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, mUpdatesEnabled(true)
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, mLineNumber(1)
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{
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}
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nsStyleLinkElement::~nsStyleLinkElement()
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{
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nsStyleLinkElement::SetStyleSheet(nullptr);
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}
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void
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nsStyleLinkElement::Unlink()
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{
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nsStyleLinkElement::SetStyleSheet(nullptr);
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}
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void
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nsStyleLinkElement::Traverse(nsCycleCollectionTraversalCallback &cb)
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{
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nsStyleLinkElement* tmp = this;
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mStyleSheet);
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}
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void
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nsStyleLinkElement::SetStyleSheet(StyleSheet* aStyleSheet)
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{
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if (mStyleSheet) {
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mStyleSheet->SetOwningNode(nullptr);
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}
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mStyleSheet = aStyleSheet;
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if (mStyleSheet) {
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nsCOMPtr<nsINode> node = do_QueryObject(this);
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if (node) {
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mStyleSheet->SetOwningNode(node);
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}
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}
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}
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StyleSheet*
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nsStyleLinkElement::GetStyleSheet()
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{
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return mStyleSheet;
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}
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void
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nsStyleLinkElement::InitStyleLinkElement(bool aDontLoadStyle)
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{
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mDontLoadStyle = aDontLoadStyle;
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}
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void
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nsStyleLinkElement::SetEnableUpdates(bool aEnableUpdates)
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{
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mUpdatesEnabled = aEnableUpdates;
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}
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void
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nsStyleLinkElement::GetCharset(nsAString& aCharset)
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{
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aCharset.Truncate();
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}
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/* virtual */ void
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nsStyleLinkElement::OverrideBaseURI(nsIURI* aNewBaseURI)
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{
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NS_NOTREACHED("Base URI can't be overriden in this implementation "
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"of nsIStyleSheetLinkingElement.");
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}
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/* virtual */ void
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nsStyleLinkElement::SetLineNumber(uint32_t aLineNumber)
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{
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mLineNumber = aLineNumber;
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}
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/* virtual */ uint32_t
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nsStyleLinkElement::GetLineNumber()
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{
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return mLineNumber;
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}
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static uint32_t ToLinkMask(const nsAString& aLink)
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{
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// Keep this in sync with sRelValues in HTMLLinkElement.cpp
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if (aLink.EqualsLiteral("prefetch"))
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return nsStyleLinkElement::ePREFETCH;
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else if (aLink.EqualsLiteral("dns-prefetch"))
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return nsStyleLinkElement::eDNS_PREFETCH;
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else if (aLink.EqualsLiteral("stylesheet"))
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return nsStyleLinkElement::eSTYLESHEET;
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else if (aLink.EqualsLiteral("next"))
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return nsStyleLinkElement::eNEXT;
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else if (aLink.EqualsLiteral("alternate"))
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return nsStyleLinkElement::eALTERNATE;
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else if (aLink.EqualsLiteral("preconnect"))
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return nsStyleLinkElement::ePRECONNECT;
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else if (aLink.EqualsLiteral("preload"))
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return nsStyleLinkElement::ePRELOAD;
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else
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return 0;
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}
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uint32_t nsStyleLinkElement::ParseLinkTypes(const nsAString& aTypes)
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{
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uint32_t linkMask = 0;
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nsAString::const_iterator start, done;
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aTypes.BeginReading(start);
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aTypes.EndReading(done);
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if (start == done)
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return linkMask;
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nsAString::const_iterator current(start);
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bool inString = !nsContentUtils::IsHTMLWhitespace(*current);
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nsAutoString subString;
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while (current != done) {
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if (nsContentUtils::IsHTMLWhitespace(*current)) {
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if (inString) {
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nsContentUtils::ASCIIToLower(Substring(start, current), subString);
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linkMask |= ToLinkMask(subString);
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inString = false;
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}
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}
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else {
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if (!inString) {
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start = current;
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inString = true;
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}
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}
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++current;
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}
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if (inString) {
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nsContentUtils::ASCIIToLower(Substring(start, current), subString);
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linkMask |= ToLinkMask(subString);
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}
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return linkMask;
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}
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// We will use official mime-types from:
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// https://www.iana.org/assignments/media-types/media-types.xhtml#font
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// We do not support old deprecated mime-types for preload feature.
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// (We currectly do not support font/collection)
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static uint32_t StyleLinkElementFontMimeTypesNum = 5;
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static const char* StyleLinkElementFontMimeTypes[] = {
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"font/otf",
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"font/sfnt",
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"font/ttf",
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"font/woff",
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"font/woff2"
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};
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bool
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IsFontMimeType(const nsAString& aType)
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{
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if (aType.IsEmpty()) {
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return true;
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}
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for (uint32_t i = 0; i < StyleLinkElementFontMimeTypesNum; i++) {
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if (aType.EqualsASCII(StyleLinkElementFontMimeTypes[i])) {
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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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bool
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nsStyleLinkElement::CheckPreloadAttrs(const nsAttrValue& aAs,
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const nsAString& aType,
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const nsAString& aMedia,
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nsIDocument* aDocument)
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{
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nsContentPolicyType policyType = Link::AsValueToContentPolicy(aAs);
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if (policyType == nsIContentPolicy::TYPE_INVALID) {
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return false;
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}
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// Check if media attribute is valid.
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if (!aMedia.IsEmpty()) {
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RefPtr<MediaList> mediaList = MediaList::Create(aDocument->GetStyleBackendType(),
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aMedia);
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nsIPresShell* shell = aDocument->GetShell();
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if (!shell) {
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return false;
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}
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nsPresContext* presContext = shell->GetPresContext();
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if (!presContext) {
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return false;
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}
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if (!mediaList->Matches(presContext)) {
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return false;
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}
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}
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if (aType.IsEmpty()) {
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return true;
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}
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nsString type = nsString(aType);
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ToLowerCase(type);
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if (policyType == nsIContentPolicy::TYPE_OTHER) {
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return true;
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} else if (policyType == nsIContentPolicy::TYPE_MEDIA) {
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if (aAs.GetEnumValue() == DESTINATION_TRACK) {
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if (type.EqualsASCII("text/vtt")) {
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return true;
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} else {
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return false;
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}
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}
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Maybe<MediaContainerType> mimeType = MakeMediaContainerType(aType);
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if (!mimeType) {
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return false;
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}
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DecoderDoctorDiagnostics diagnostics;
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CanPlayStatus status = DecoderTraits::CanHandleContainerType(*mimeType,
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&diagnostics);
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// Preload if this return CANPLAY_YES and CANPLAY_MAYBE.
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if (status == CANPLAY_NO) {
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return false;
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} else {
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return true;
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}
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} else if (policyType == nsIContentPolicy::TYPE_FONT) {
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if (IsFontMimeType(type)) {
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return true;
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} else {
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return false;
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}
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} else if (policyType == nsIContentPolicy::TYPE_IMAGE) {
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if (imgLoader::SupportImageWithMimeType(NS_ConvertUTF16toUTF8(type).get(),
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AcceptedMimeTypes::IMAGES_AND_DOCUMENTS)) {
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return true;
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} else {
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return false;
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}
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} else if (policyType == nsIContentPolicy::TYPE_SCRIPT) {
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if (nsContentUtils::IsJavascriptMIMEType(type)) {
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return true;
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} else {
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return false;
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}
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} else if (policyType == nsIContentPolicy::TYPE_STYLESHEET) {
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if (type.EqualsASCII("text/css")) {
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return true;
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} else {
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return false;
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}
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}
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return false;
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}
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nsresult
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nsStyleLinkElement::UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
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bool* aWillNotify,
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bool* aIsAlternate,
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bool aForceReload)
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{
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if (aForceReload) {
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// We remove this stylesheet from the cache to load a new version.
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nsCOMPtr<nsIContent> thisContent = do_QueryInterface(this);
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nsCOMPtr<nsIDocument> doc = thisContent->IsInShadowTree() ?
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thisContent->OwnerDoc() : thisContent->GetUncomposedDoc();
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if (doc && doc->CSSLoader()->GetEnabled() &&
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mStyleSheet && !mStyleSheet->IsInline()) {
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doc->CSSLoader()->ObsoleteSheet(mStyleSheet->GetOriginalURI());
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}
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}
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return DoUpdateStyleSheet(nullptr, nullptr, aObserver, aWillNotify,
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aIsAlternate, aForceReload);
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}
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nsresult
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nsStyleLinkElement::UpdateStyleSheetInternal(nsIDocument *aOldDocument,
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ShadowRoot *aOldShadowRoot,
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bool aForceUpdate)
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{
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bool notify, alternate;
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return DoUpdateStyleSheet(aOldDocument, aOldShadowRoot, nullptr, ¬ify,
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&alternate, aForceUpdate);
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}
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static bool
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IsScopedStyleElement(nsIContent* aContent)
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{
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// This is quicker than, say, QIing aContent to nsStyleLinkElement
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// and then calling its virtual GetStyleSheetInfo method to find out
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// if it is scoped.
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return (aContent->IsHTMLElement(nsGkAtoms::style) ||
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aContent->IsSVGElement(nsGkAtoms::style)) &&
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aContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::scoped) &&
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aContent->OwnerDoc()->IsScopedStyleEnabled();
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}
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static bool
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HasScopedStyleSheetChild(nsIContent* aContent)
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{
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for (nsIContent* n = aContent->GetFirstChild(); n; n = n->GetNextSibling()) {
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if (IsScopedStyleElement(n)) {
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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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// Called when aElement has had a <style scoped> child removed.
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static void
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UpdateIsElementInStyleScopeFlagOnSubtree(Element* aElement)
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{
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NS_ASSERTION(aElement->IsElementInStyleScope(),
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"only call UpdateIsElementInStyleScopeFlagOnSubtree on a "
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"subtree that has IsElementInStyleScope boolean flag set");
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if (HasScopedStyleSheetChild(aElement)) {
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return;
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}
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aElement->ClearIsElementInStyleScope();
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nsIContent* n = aElement->GetNextNode(aElement);
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while (n) {
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if (HasScopedStyleSheetChild(n)) {
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n = n->GetNextNonChildNode(aElement);
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} else {
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if (n->IsElement()) {
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n->ClearIsElementInStyleScope();
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}
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n = n->GetNextNode(aElement);
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}
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}
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}
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nsresult
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nsStyleLinkElement::DoUpdateStyleSheet(nsIDocument* aOldDocument,
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ShadowRoot* aOldShadowRoot,
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nsICSSLoaderObserver* aObserver,
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bool* aWillNotify,
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bool* aIsAlternate,
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bool aForceUpdate)
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{
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*aWillNotify = false;
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nsCOMPtr<nsIContent> thisContent = do_QueryInterface(this);
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// All instances of nsStyleLinkElement should implement nsIContent.
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MOZ_ASSERT(thisContent);
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if (thisContent->IsInAnonymousSubtree() &&
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thisContent->IsAnonymousContentInSVGUseSubtree()) {
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// Stylesheets in <use>-cloned subtrees are disabled until we figure out
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// how they should behave.
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return NS_OK;
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}
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// Check for a ShadowRoot because link elements are inert in a
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// ShadowRoot.
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ShadowRoot* containingShadow = thisContent->GetContainingShadow();
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if (thisContent->IsHTMLElement(nsGkAtoms::link) &&
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(aOldShadowRoot || containingShadow)) {
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return NS_OK;
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}
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// XXXheycam ServoStyleSheets do not support <style scoped>.
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Element* oldScopeElement = nullptr;
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if (mStyleSheet) {
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if (mStyleSheet->IsServo()) {
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// XXXheycam ServoStyleSheets don't support <style scoped>.
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} else {
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#ifdef MOZ_OLD_STYLE
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oldScopeElement = mStyleSheet->AsGecko()->GetScopeElement();
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#else
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MOZ_CRASH("old style system disabled");
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#endif
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}
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}
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if (mStyleSheet && (aOldDocument || aOldShadowRoot)) {
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MOZ_ASSERT(!(aOldDocument && aOldShadowRoot),
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"ShadowRoot content is never in document, thus "
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"there should not be a old document and old "
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"ShadowRoot simultaneously.");
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// We're removing the link element from the document or shadow tree,
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// unload the stylesheet. We want to do this even if updates are
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// disabled, since otherwise a sheet with a stale linking element pointer
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// will be hanging around -- not good!
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if (aOldShadowRoot) {
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aOldShadowRoot->RemoveSheet(mStyleSheet);
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} else {
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aOldDocument->BeginUpdate(UPDATE_STYLE);
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aOldDocument->RemoveStyleSheet(mStyleSheet);
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aOldDocument->EndUpdate(UPDATE_STYLE);
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}
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nsStyleLinkElement::SetStyleSheet(nullptr);
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if (oldScopeElement) {
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UpdateIsElementInStyleScopeFlagOnSubtree(oldScopeElement);
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}
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}
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// When static documents are created, stylesheets are cloned manually.
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if (mDontLoadStyle || !mUpdatesEnabled ||
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thisContent->OwnerDoc()->IsStaticDocument()) {
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return NS_OK;
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}
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nsCOMPtr<nsIDocument> doc = thisContent->IsInShadowTree() ?
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thisContent->OwnerDoc() : thisContent->GetUncomposedDoc();
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if (!doc || !doc->CSSLoader()->GetEnabled()) {
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return NS_OK;
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}
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bool isInline;
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nsCOMPtr<nsIPrincipal> triggeringPrincipal;
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nsCOMPtr<nsIURI> uri = GetStyleSheetURL(&isInline, getter_AddRefs(triggeringPrincipal));
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if (!aForceUpdate && mStyleSheet && !isInline && uri) {
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nsIURI* oldURI = mStyleSheet->GetSheetURI();
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if (oldURI) {
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bool equal;
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nsresult rv = oldURI->Equals(uri, &equal);
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if (NS_SUCCEEDED(rv) && equal) {
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return NS_OK; // We already loaded this stylesheet
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}
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}
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}
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if (mStyleSheet) {
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if (thisContent->IsInShadowTree()) {
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ShadowRoot* containingShadow = thisContent->GetContainingShadow();
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containingShadow->RemoveSheet(mStyleSheet);
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} else {
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doc->BeginUpdate(UPDATE_STYLE);
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doc->RemoveStyleSheet(mStyleSheet);
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doc->EndUpdate(UPDATE_STYLE);
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}
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nsStyleLinkElement::SetStyleSheet(nullptr);
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}
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if (!uri && !isInline) {
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return NS_OK; // If href is empty and this is not inline style then just bail
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}
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nsAutoString title, type, media;
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bool isScoped;
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bool isAlternate;
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GetStyleSheetInfo(title, type, media, &isScoped, &isAlternate);
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if (!type.LowerCaseEqualsLiteral("text/css")) {
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return NS_OK;
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}
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Element* scopeElement = isScoped ? thisContent->GetParentElement() : nullptr;
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if (scopeElement) {
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NS_ASSERTION(isInline, "non-inline style must not have scope element");
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scopeElement->SetIsElementInStyleScopeFlagOnSubtree(true);
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}
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bool doneLoading = false;
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nsresult rv = NS_OK;
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// Load the link's referrerpolicy attribute. If the link does not provide a
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// referrerpolicy attribute, ignore this and use the document's referrer
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// policy
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net::ReferrerPolicy referrerPolicy = GetLinkReferrerPolicy();
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if (referrerPolicy == net::RP_Unset) {
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referrerPolicy = doc->GetReferrerPolicy();
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}
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if (isInline) {
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nsAutoString text;
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if (!nsContentUtils::GetNodeTextContent(thisContent, false, text, fallible)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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MOZ_ASSERT(thisContent->NodeInfo()->NameAtom() != nsGkAtoms::link,
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"<link> is not 'inline', and needs different CSP checks");
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|
MOZ_ASSERT(thisContent->IsElement());
|
|
if (!nsStyleUtil::CSPAllowsInlineStyle(thisContent->AsElement(),
|
|
thisContent->NodePrincipal(),
|
|
triggeringPrincipal,
|
|
doc->GetDocumentURI(),
|
|
mLineNumber, text, &rv))
|
|
return rv;
|
|
|
|
// Parse the style sheet.
|
|
rv = doc->CSSLoader()->
|
|
LoadInlineStyle(thisContent, text, triggeringPrincipal, mLineNumber,
|
|
title, media, referrerPolicy, scopeElement,
|
|
aObserver, &doneLoading, &isAlternate);
|
|
} else {
|
|
nsAutoString integrity;
|
|
if (thisContent->IsElement()) {
|
|
thisContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::integrity,
|
|
integrity);
|
|
}
|
|
if (!integrity.IsEmpty()) {
|
|
MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
|
|
("nsStyleLinkElement::DoUpdateStyleSheet, integrity=%s",
|
|
NS_ConvertUTF16toUTF8(integrity).get()));
|
|
}
|
|
|
|
// XXXbz clone the URI here to work around content policies modifying URIs.
|
|
nsCOMPtr<nsIURI> clonedURI;
|
|
uri->Clone(getter_AddRefs(clonedURI));
|
|
NS_ENSURE_TRUE(clonedURI, NS_ERROR_OUT_OF_MEMORY);
|
|
rv = doc->CSSLoader()->
|
|
LoadStyleLink(thisContent, clonedURI, triggeringPrincipal, title, media,
|
|
isAlternate, GetCORSMode(), referrerPolicy, integrity,
|
|
aObserver, &isAlternate);
|
|
if (NS_FAILED(rv)) {
|
|
// Don't propagate LoadStyleLink() errors further than this, since some
|
|
// consumers (e.g. nsXMLContentSink) will completely abort on innocuous
|
|
// things like a stylesheet load being blocked by the security system.
|
|
doneLoading = true;
|
|
isAlternate = false;
|
|
rv = NS_OK;
|
|
}
|
|
}
|
|
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
*aWillNotify = !doneLoading;
|
|
*aIsAlternate = isAlternate;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsStyleLinkElement::UpdateStyleSheetScopedness(bool aIsNowScoped)
|
|
{
|
|
if (!mStyleSheet) {
|
|
return;
|
|
}
|
|
|
|
if (mStyleSheet->IsServo()) {
|
|
// XXXheycam ServoStyleSheets don't support <style scoped>.
|
|
NS_ERROR("stylo: ServoStyleSheets don't support <style scoped>");
|
|
return;
|
|
}
|
|
|
|
#ifdef MOZ_OLD_STYLE
|
|
CSSStyleSheet* sheet = mStyleSheet->AsGecko();
|
|
|
|
nsCOMPtr<nsIContent> thisContent = do_QueryInterface(this);
|
|
|
|
Element* oldScopeElement = sheet->GetScopeElement();
|
|
Element* newScopeElement = aIsNowScoped ?
|
|
thisContent->GetParentElement() :
|
|
nullptr;
|
|
|
|
if (oldScopeElement == newScopeElement) {
|
|
return;
|
|
}
|
|
|
|
nsIDocument* document = thisContent->GetOwnerDocument();
|
|
|
|
if (thisContent->IsInShadowTree()) {
|
|
ShadowRoot* containingShadow = thisContent->GetContainingShadow();
|
|
containingShadow->RemoveSheet(mStyleSheet);
|
|
|
|
sheet->SetScopeElement(newScopeElement);
|
|
|
|
containingShadow->InsertSheet(mStyleSheet, thisContent);
|
|
} else {
|
|
document->BeginUpdate(UPDATE_STYLE);
|
|
document->RemoveStyleSheet(mStyleSheet);
|
|
|
|
sheet->SetScopeElement(newScopeElement);
|
|
|
|
document->AddStyleSheet(mStyleSheet);
|
|
document->EndUpdate(UPDATE_STYLE);
|
|
}
|
|
|
|
if (oldScopeElement) {
|
|
UpdateIsElementInStyleScopeFlagOnSubtree(oldScopeElement);
|
|
}
|
|
if (newScopeElement) {
|
|
newScopeElement->SetIsElementInStyleScopeFlagOnSubtree(true);
|
|
}
|
|
#else
|
|
MOZ_CRASH("old style system disabled");
|
|
#endif
|
|
}
|