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gecko-dev/dom/html/HTMLLinkElement.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/HTMLLinkElement.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStates.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/HTMLLinkElementBinding.h"
#include "nsContentUtils.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsDOMTokenList.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsINode.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIURL.h"
#include "nsPIDOMWindow.h"
#include "nsReadableUtils.h"
#include "nsStyleConsts.h"
#include "nsStyleLinkElement.h"
#include "nsUnicharUtils.h"
#include "nsWindowSizes.h"
#include "nsIContentPolicy.h"
#include "nsMimeTypes.h"
#include "imgLoader.h"
#include "MediaContainerType.h"
#include "DecoderDoctorDiagnostics.h"
#include "DecoderTraits.h"
#include "MediaList.h"
#include "nsAttrValueInlines.h"
#define LINK_ELEMENT_FLAG_BIT(n_) \
NODE_FLAG_BIT(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET + (n_))
// Link element specific bits
enum {
// Indicates that a DNS Prefetch has been requested from this Link element.
HTML_LINK_DNS_PREFETCH_REQUESTED = LINK_ELEMENT_FLAG_BIT(0),
// Indicates that a DNS Prefetch was added to the deferral queue
HTML_LINK_DNS_PREFETCH_DEFERRED = LINK_ELEMENT_FLAG_BIT(1)
};
#undef LINK_ELEMENT_FLAG_BIT
ASSERT_NODE_FLAGS_SPACE(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET + 2);
NS_IMPL_NS_NEW_HTML_ELEMENT(Link)
namespace mozilla {
namespace dom {
HTMLLinkElement::HTMLLinkElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsGenericHTMLElement(std::move(aNodeInfo)), Link(this) {}
HTMLLinkElement::~HTMLLinkElement() {}
NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLLinkElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLLinkElement,
nsGenericHTMLElement)
tmp->nsStyleLinkElement::Traverse(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRelList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLLinkElement,
nsGenericHTMLElement)
tmp->nsStyleLinkElement::Unlink();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRelList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLLinkElement,
nsGenericHTMLElement,
nsIStyleSheetLinkingElement, Link)
NS_IMPL_ELEMENT_CLONE(HTMLLinkElement)
bool HTMLLinkElement::Disabled() const {
if (StaticPrefs::dom_link_disabled_attribute_enabled()) {
return GetBoolAttr(nsGkAtoms::disabled);
}
StyleSheet* ss = GetSheet();
return ss && ss->Disabled();
}
void HTMLLinkElement::SetDisabled(bool aDisabled, ErrorResult& aRv) {
if (StaticPrefs::dom_link_disabled_attribute_enabled()) {
return SetHTMLBoolAttr(nsGkAtoms::disabled, aDisabled, aRv);
}
if (StyleSheet* ss = GetSheet()) {
ss->SetDisabled(aDisabled);
}
}
void HTMLLinkElement::OnDNSPrefetchRequested() {
UnsetFlags(HTML_LINK_DNS_PREFETCH_DEFERRED);
SetFlags(HTML_LINK_DNS_PREFETCH_REQUESTED);
}
void HTMLLinkElement::OnDNSPrefetchDeferred() {
UnsetFlags(HTML_LINK_DNS_PREFETCH_REQUESTED);
SetFlags(HTML_LINK_DNS_PREFETCH_DEFERRED);
}
bool HTMLLinkElement::HasDeferredDNSPrefetchRequest() {
return HasFlag(HTML_LINK_DNS_PREFETCH_DEFERRED);
}
nsresult HTMLLinkElement::BindToTree(BindContext& aContext, nsINode& aParent) {
Link::ResetLinkState(false, Link::ElementHasHref());
nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
NS_ENSURE_SUCCESS(rv, rv);
if (IsInComposedDoc()) {
if (!aContext.OwnerDoc().NodePrincipal()->IsSystemPrincipal()) {
aContext.OwnerDoc().RegisterPendingLinkUpdate(this);
}
TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
}
void (HTMLLinkElement::*update)() =
&HTMLLinkElement::UpdateStyleSheetInternal;
nsContentUtils::AddScriptRunner(
NewRunnableMethod("dom::HTMLLinkElement::BindToTree", this, update));
// FIXME(emilio, bug 1555947): Why does this use the uncomposed doc but the
// attribute change code the composed doc?
if (IsInUncomposedDoc() &&
AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
eIgnoreCase)) {
aContext.OwnerDoc().LocalizationLinkAdded(this);
}
LinkAdded();
return rv;
}
void HTMLLinkElement::LinkAdded() {
CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkAdded"));
}
void HTMLLinkElement::LinkRemoved() {
CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkRemoved"));
}
void HTMLLinkElement::UnbindFromTree(bool aNullParent) {
// Cancel any DNS prefetches
// Note: Must come before ResetLinkState. If called after, it will recreate
// mCachedURI based on data that is invalid - due to a call to GetHostname.
CancelDNSPrefetch(HTML_LINK_DNS_PREFETCH_DEFERRED,
HTML_LINK_DNS_PREFETCH_REQUESTED);
CancelPrefetchOrPreload();
// Without removing the link state we risk a dangling pointer
// in the mStyledLinks hashtable
Link::ResetLinkState(false, Link::ElementHasHref());
// If this is reinserted back into the document it will not be
// from the parser.
Document* oldDoc = GetUncomposedDoc();
ShadowRoot* oldShadowRoot = GetContainingShadow();
// We want to update the localization but only if the
// link is removed from a DOM change, and not
// because the document is going away.
bool ignore;
if (oldDoc && oldDoc->GetScriptHandlingObject(ignore) &&
this->AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel,
nsGkAtoms::localization, eIgnoreCase)) {
oldDoc->LocalizationLinkRemoved(this);
}
CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMLinkRemoved"));
nsGenericHTMLElement::UnbindFromTree(aNullParent);
Unused << UpdateStyleSheetInternal(oldDoc, oldShadowRoot);
}
bool HTMLLinkElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) {
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::crossorigin) {
ParseCORSValue(aValue, aResult);
return true;
}
if (aAttribute == nsGkAtoms::as) {
ParseAsValue(aValue, aResult);
return true;
}
if (aAttribute == nsGkAtoms::sizes) {
aResult.ParseAtomArray(aValue);
return true;
}
if (aAttribute == nsGkAtoms::integrity) {
aResult.ParseStringOrAtom(aValue);
return true;
}
}
return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult);
}
void HTMLLinkElement::CreateAndDispatchEvent(Document* aDoc,
const nsAString& aEventName) {
if (!aDoc) return;
// In the unlikely case that both rev is specified *and* rel=stylesheet,
// this code will cause the event to fire, on the principle that maybe the
// page really does want to specify that its author is a stylesheet. Since
// this should never actually happen and the performance hit is minimal,
// doing the "right" thing costs virtually nothing here, even if it doesn't
// make much sense.
static Element::AttrValuesArray strings[] = {nsGkAtoms::_empty,
nsGkAtoms::stylesheet, nullptr};
if (!nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,
nsGkAtoms::rev) &&
FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::rel, strings,
eIgnoreCase) != ATTR_VALUE_NO_MATCH)
return;
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
this, aEventName, CanBubble::eYes, ChromeOnlyDispatch::eYes);
// Always run async in order to avoid running script when the content
// sink isn't expecting it.
asyncDispatcher->PostDOMEvent();
}
nsresult HTMLLinkElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValueOrString* aValue,
bool aNotify) {
if (aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::href || aName == nsGkAtoms::rel)) {
CancelDNSPrefetch(HTML_LINK_DNS_PREFETCH_DEFERRED,
HTML_LINK_DNS_PREFETCH_REQUESTED);
CancelPrefetchOrPreload();
}
return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
aNotify);
}
nsresult HTMLLinkElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
// It's safe to call ResetLinkState here because our new attr value has
// already been set or unset. ResetLinkState needs the updated attribute
// value because notifying the document that content states have changed will
// call IntrinsicState, which will try to get updated information about the
// visitedness from Link.
if (aName == nsGkAtoms::href && kNameSpaceID_None == aNameSpaceID) {
bool hasHref = aValue;
Link::ResetLinkState(!!aNotify, hasHref);
if (IsInUncomposedDoc()) {
CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkChanged"));
}
}
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href) {
mTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
this, aValue ? aValue->GetStringValue() : EmptyString(),
aSubjectPrincipal);
}
// If a link's `rel` attribute was changed from or to `localization`,
// update the list of localization links.
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::rel) {
Document* doc = GetComposedDoc();
if (doc) {
if ((aValue && aValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
(!aOldValue ||
!aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
doc->LocalizationLinkAdded(this);
} else if ((aOldValue &&
aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
(!aValue ||
!aValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
doc->LocalizationLinkRemoved(this);
}
}
}
// If the link has `rel=localization` and its `href` attribute is changed,
// update the list of localization links.
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href &&
AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
eIgnoreCase)) {
Document* doc = GetComposedDoc();
if (doc) {
if (aOldValue) {
doc->LocalizationLinkRemoved(this);
}
if (aValue) {
doc->LocalizationLinkAdded(this);
}
}
}
if (aValue) {
if (aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type || aName == nsGkAtoms::as ||
aName == nsGkAtoms::crossorigin ||
(aName == nsGkAtoms::disabled &&
StaticPrefs::dom_link_disabled_attribute_enabled()))) {
bool dropSheet = false;
if (aName == nsGkAtoms::rel) {
nsAutoString value;
aValue->ToString(value);
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(value);
if (GetSheet()) {
dropSheet = !(linkTypes & nsStyleLinkElement::eSTYLESHEET);
}
}
if ((aName == nsGkAtoms::rel || aName == nsGkAtoms::href) &&
IsInComposedDoc()) {
TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
}
if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
IsInComposedDoc()) {
UpdatePreload(aName, aValue, aOldValue);
}
const bool forceUpdate =
dropSheet || aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type || aName == nsGkAtoms::disabled;
Unused << UpdateStyleSheetInternal(
nullptr, nullptr, forceUpdate ? ForceUpdate::Yes : ForceUpdate::No);
}
} else {
if (aNameSpaceID == kNameSpaceID_None) {
if (aName == nsGkAtoms::disabled &&
StaticPrefs::dom_link_disabled_attribute_enabled()) {
mExplicitlyEnabled = true;
}
// Since removing href or rel makes us no longer link to a stylesheet,
// force updates for those too.
if (aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
aName == nsGkAtoms::type ||
(aName == nsGkAtoms::disabled &&
StaticPrefs::dom_link_disabled_attribute_enabled())) {
Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
}
if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
IsInComposedDoc()) {
UpdatePreload(aName, aValue, aOldValue);
}
}
}
return nsGenericHTMLElement::AfterSetAttr(
aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}
void HTMLLinkElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
GetEventTargetParentForAnchors(aVisitor);
}
nsresult HTMLLinkElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
return PostHandleEventForAnchors(aVisitor);
}
bool HTMLLinkElement::IsLink(nsIURI** aURI) const { return IsHTMLLink(aURI); }
void HTMLLinkElement::GetLinkTarget(nsAString& aTarget) {
GetAttr(kNameSpaceID_None, nsGkAtoms::target, aTarget);
if (aTarget.IsEmpty()) {
GetBaseTarget(aTarget);
}
}
static const DOMTokenListSupportedToken sSupportedRelValues[] = {
// Keep this in sync with ToLinkMask in nsStyleLinkElement.cpp.
// "preload" must come first because it can be disabled.
"preload", "prefetch", "dns-prefetch", "stylesheet", "next",
"alternate", "preconnect", "icon", "search", nullptr};
nsDOMTokenList* HTMLLinkElement::RelList() {
if (!mRelList) {
if (Preferences::GetBool("network.preload")) {
mRelList = new nsDOMTokenList(this, nsGkAtoms::rel, sSupportedRelValues);
} else {
mRelList =
new nsDOMTokenList(this, nsGkAtoms::rel, &sSupportedRelValues[1]);
}
}
return mRelList;
}
already_AddRefed<nsIURI> HTMLLinkElement::GetHrefURI() const {
return GetHrefURIForAnchors();
}
Maybe<nsStyleLinkElement::SheetInfo> HTMLLinkElement::GetStyleSheetInfo() {
nsAutoString rel;
GetAttr(kNameSpaceID_None, nsGkAtoms::rel, rel);
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(rel);
if (!(linkTypes & nsStyleLinkElement::eSTYLESHEET)) {
return Nothing();
}
if (!IsCSSMimeTypeAttribute(*this)) {
return Nothing();
}
if (StaticPrefs::dom_link_disabled_attribute_enabled() && Disabled()) {
return Nothing();
}
nsAutoString title;
nsAutoString media;
GetTitleAndMediaForElement(*this, title, media);
bool alternate = linkTypes & nsStyleLinkElement::eALTERNATE;
if (alternate && title.IsEmpty()) {
// alternates must have title.
return Nothing();
}
nsAutoString href;
GetAttr(kNameSpaceID_None, nsGkAtoms::href, href);
if (href.IsEmpty()) {
return Nothing();
}
nsCOMPtr<nsIURI> uri = Link::GetURI();
nsCOMPtr<nsIPrincipal> prin = mTriggeringPrincipal;
return Some(SheetInfo{
*OwnerDoc(),
this,
uri.forget(),
prin.forget(),
GetReferrerPolicyAsEnum(),
GetCORSMode(),
title,
media,
alternate ? HasAlternateRel::Yes : HasAlternateRel::No,
IsInline::No,
mExplicitlyEnabled ? IsExplicitlyEnabled::Yes : IsExplicitlyEnabled::No,
});
}
EventStates HTMLLinkElement::IntrinsicState() const {
return Link::LinkState() | nsGenericHTMLElement::IntrinsicState();
}
void HTMLLinkElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
size_t* aNodeSize) const {
nsGenericHTMLElement::AddSizeOfExcludingThis(aSizes, aNodeSize);
*aNodeSize += Link::SizeOfExcludingThis(aSizes.mState);
}
JSObject* HTMLLinkElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return HTMLLinkElement_Binding::Wrap(aCx, this, aGivenProto);
}
void HTMLLinkElement::GetAs(nsAString& aResult) {
GetEnumAttr(nsGkAtoms::as, EmptyCString().get(), aResult);
}
// We will use official mime-types from:
// https://www.iana.org/assignments/media-types/media-types.xhtml#font
// We do not support old deprecated mime-types for preload feature.
// (We currectly do not support font/collection)
static uint32_t StyleLinkElementFontMimeTypesNum = 5;
static const char* StyleLinkElementFontMimeTypes[] = {
"font/otf", "font/sfnt", "font/ttf", "font/woff", "font/woff2"};
bool IsFontMimeType(const nsAString& aType) {
if (aType.IsEmpty()) {
return true;
}
for (uint32_t i = 0; i < StyleLinkElementFontMimeTypesNum; i++) {
if (aType.EqualsASCII(StyleLinkElementFontMimeTypes[i])) {
return true;
}
}
return false;
}
bool HTMLLinkElement::CheckPreloadAttrs(const nsAttrValue& aAs,
const nsAString& aType,
const nsAString& aMedia,
Document* aDocument) {
nsContentPolicyType policyType = Link::AsValueToContentPolicy(aAs);
if (policyType == nsIContentPolicy::TYPE_INVALID) {
return false;
}
// Check if media attribute is valid.
if (!aMedia.IsEmpty()) {
RefPtr<MediaList> mediaList = MediaList::Create(aMedia);
if (!mediaList->Matches(*aDocument)) {
return false;
}
}
if (aType.IsEmpty()) {
return true;
}
nsString type = nsString(aType);
ToLowerCase(type);
if (policyType == nsIContentPolicy::TYPE_OTHER) {
return true;
} else if (policyType == nsIContentPolicy::TYPE_MEDIA) {
if (aAs.GetEnumValue() == DESTINATION_TRACK) {
if (type.EqualsASCII("text/vtt")) {
return true;
} else {
return false;
}
}
Maybe<MediaContainerType> mimeType = MakeMediaContainerType(aType);
if (!mimeType) {
return false;
}
DecoderDoctorDiagnostics diagnostics;
CanPlayStatus status =
DecoderTraits::CanHandleContainerType(*mimeType, &diagnostics);
// Preload if this return CANPLAY_YES and CANPLAY_MAYBE.
if (status == CANPLAY_NO) {
return false;
} else {
return true;
}
} else if (policyType == nsIContentPolicy::TYPE_FONT) {
if (IsFontMimeType(type)) {
return true;
} else {
return false;
}
} else if (policyType == nsIContentPolicy::TYPE_IMAGE) {
if (imgLoader::SupportImageWithMimeType(
NS_ConvertUTF16toUTF8(type).get(),
AcceptedMimeTypes::IMAGES_AND_DOCUMENTS)) {
return true;
} else {
return false;
}
} else if (policyType == nsIContentPolicy::TYPE_SCRIPT) {
if (nsContentUtils::IsJavascriptMIMEType(type)) {
return true;
} else {
return false;
}
} else if (policyType == nsIContentPolicy::TYPE_STYLESHEET) {
if (type.EqualsASCII("text/css")) {
return true;
} else {
return false;
}
}
return false;
}
} // namespace dom
} // namespace mozilla
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