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Mypal/dom/html/HTMLLinkElement.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/HTMLLinkElementBinding.h"
#include "nsContentUtils.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsDOMTokenList.h"
#include "nsIContentInlines.h"
#include "nsIDocument.h"
#include "nsIDOMEvent.h"
#include "nsIDOMStyleSheet.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"
#define LINK_ELEMENT_FLAG_BIT(n_) \
NODE_FLAG_BIT(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET + (n_))
#define LINK_DISABLED Preferences::GetBool("dom.link.disabled_attribute.enabled", true)
// 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(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(mImportLoader)
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(mImportLoader)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(HTMLLinkElement, Element)
NS_IMPL_RELEASE_INHERITED(HTMLLinkElement, Element)
// QueryInterface implementation for HTMLLinkElement
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLLinkElement)
NS_INTERFACE_TABLE_INHERITED(HTMLLinkElement,
nsIDOMHTMLLinkElement,
nsIStyleSheetLinkingElement,
Link)
NS_INTERFACE_TABLE_TAIL_INHERITING(nsGenericHTMLElement)
NS_IMPL_ELEMENT_CLONE(HTMLLinkElement)
bool
HTMLLinkElement::Disabled() const
{
if (LINK_DISABLED) {
return GetBoolAttr(nsGkAtoms::disabled);
}
StyleSheet* ss = GetSheet();
return ss && ss->Disabled();
}
NS_IMETHODIMP
HTMLLinkElement::GetMozDisabled(bool* aDisabled)
{
*aDisabled = Disabled();
return NS_OK;
}
void
HTMLLinkElement::SetDisabled(bool aDisabled, ErrorResult& aRv)
{
if (LINK_DISABLED) {
return SetHTMLBoolAttr(nsGkAtoms::disabled, aDisabled, aRv);
}
if (StyleSheet* ss = GetSheet()) {
ss->SetDisabled(aDisabled);
}
}
NS_IMETHODIMP
HTMLLinkElement::SetMozDisabled(bool aDisabled)
{
ErrorResult rv;
SetDisabled(aDisabled, rv);
return rv.StealNSResult();
}
NS_IMPL_STRING_ATTR(HTMLLinkElement, Charset, charset)
NS_IMPL_URI_ATTR(HTMLLinkElement, Href, href)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Hreflang, hreflang)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Media, media)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Rel, rel)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Rev, rev)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Target, target)
NS_IMPL_STRING_ATTR(HTMLLinkElement, Type, type)
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(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
Link::ResetLinkState(false, Link::ElementHasHref());
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
// Link must be inert in ShadowRoot.
if (aDocument && !GetContainingShadow()) {
aDocument->RegisterPendingLinkUpdate(this);
}
if (IsInComposedDoc()) {
TryDNSPrefetchPreconnectOrPrefetch();
}
void (HTMLLinkElement::*update)() = &HTMLLinkElement::UpdateStyleSheetInternal;
nsContentUtils::AddScriptRunner(NewRunnableMethod(this, update));
void (HTMLLinkElement::*updateImport)() = &HTMLLinkElement::UpdateImport;
nsContentUtils::AddScriptRunner(NewRunnableMethod(this, updateImport));
CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMLinkAdded"));
return rv;
}
void
HTMLLinkElement::LinkAdded()
{
CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkAdded"));
}
void
HTMLLinkElement::LinkRemoved()
{
CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkRemoved"));
}
void
HTMLLinkElement::UnbindFromTree(bool aDeep, 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);
CancelPrefetch();
// If this link is ever reinserted into a document, it might
// be under a different xml:base, so forget the cached state now.
Link::ResetLinkState(false, Link::ElementHasHref());
// If this is reinserted back into the document it will not be
// from the parser.
nsCOMPtr<nsIDocument> oldDoc = GetUncomposedDoc();
// Check for a ShadowRoot because link elements are inert in a
// ShadowRoot.
ShadowRoot* oldShadowRoot = GetBindingParent() ?
GetBindingParent()->GetShadowRoot() : nullptr;
OwnerDoc()->UnregisterPendingLinkUpdate(this);
CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMLinkRemoved"));
nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
UpdateStyleSheetInternal(oldDoc, oldShadowRoot);
UpdateImport();
}
bool
HTMLLinkElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::crossorigin) {
ParseCORSValue(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,
aResult);
}
void
HTMLLinkElement::CreateAndDispatchEvent(nsIDocument* 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 nsIContent::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, true, true);
// Always run async in order to avoid running script when the content
// sink isn't expecting it.
asyncDispatcher->PostDOMEvent();
}
void
HTMLLinkElement::UpdateImport()
{
// 1. link node should be attached to the document.
nsCOMPtr<nsIDocument> doc = GetUncomposedDoc();
if (!doc) {
// We might have been just removed from the document, so
// let's remove ourself from the list of link nodes of
// the import and reset mImportLoader.
if (mImportLoader) {
mImportLoader->RemoveLinkElement(this);
mImportLoader = nullptr;
}
return;
}
// 2. rel type should be import.
nsAutoString rel;
GetAttr(kNameSpaceID_None, nsGkAtoms::rel, rel);
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(rel, NodePrincipal());
if (!(linkTypes & eHTMLIMPORT)) {
mImportLoader = nullptr;
return;
}
nsCOMPtr<nsIURI> uri = GetHrefURI();
if (!uri) {
mImportLoader = nullptr;
return;
}
if (!nsStyleLinkElement::IsImportEnabled()) {
// For now imports are hidden behind a pref...
return;
}
RefPtr<ImportManager> manager = doc->ImportManager();
MOZ_ASSERT(manager, "ImportManager should be created lazily when needed");
{
// The load even might fire sooner than we could set mImportLoader so
// we must use async event and a scriptBlocker here.
nsAutoScriptBlocker scriptBlocker;
// CORS check will happen at the start of the load.
mImportLoader = manager->Get(uri, this, doc);
}
}
nsresult
HTMLLinkElement::BeforeSetAttr(int32_t aNameSpaceID, nsIAtom* 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);
CancelPrefetch();
}
return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName,
aValue, aNotify);
}
nsresult
HTMLLinkElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue, 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 (aValue) {
if (aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::href ||
aName == nsGkAtoms::rel ||
aName == nsGkAtoms::title ||
aName == nsGkAtoms::media ||
aName == nsGkAtoms::type ||
(LINK_DISABLED && aName == nsGkAtoms::disabled))) {
bool dropSheet = false;
if (aName == nsGkAtoms::rel) {
nsAutoString value;
aValue->ToString(value);
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(value,
NodePrincipal());
if (GetSheet()) {
dropSheet = !(linkTypes & nsStyleLinkElement::eSTYLESHEET);
} else if (linkTypes & eHTMLIMPORT) {
UpdateImport();
}
}
if (aName == nsGkAtoms::href) {
UpdateImport();
}
if ((aName == nsGkAtoms::rel || aName == nsGkAtoms::href) &&
IsInComposedDoc()) {
TryDNSPrefetchPreconnectOrPrefetch();
}
UpdateStyleSheetInternal(nullptr, nullptr,
dropSheet ||
(aName == nsGkAtoms::title ||
aName == nsGkAtoms::media ||
aName == nsGkAtoms::type ||
(LINK_DISABLED && aName == nsGkAtoms::disabled)));
}
} else {
// If the disabled attribute is removed from a link element, the
// stylesheet may be explicitly enabled.
if (aNameSpaceID == kNameSpaceID_None && LINK_DISABLED) {
if (aName == nsGkAtoms::disabled) {
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 ||
(LINK_DISABLED && aName == nsGkAtoms::disabled)) {
UpdateStyleSheetInternal(nullptr, nullptr, true);
}
if (aName == nsGkAtoms::href ||
aName == nsGkAtoms::rel) {
UpdateImport();
}
}
}
return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue,
aOldValue, aNotify);
}
nsresult
HTMLLinkElement::GetEventTargetParent(EventChainPreVisitor& aVisitor)
{
return 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.
// "import" must come first because it's conditional.
"import",
"prefetch",
"dns-prefetch",
"stylesheet",
"next",
"alternate",
"preconnect",
"icon",
"search",
nullptr
};
nsDOMTokenList*
HTMLLinkElement::RelList()
{
if (!mRelList) {
const DOMTokenListSupportedTokenArray relValues =
nsStyleLinkElement::IsImportEnabled() ?
sSupportedRelValues : &sSupportedRelValues[1];
mRelList = new nsDOMTokenList(this, nsGkAtoms::rel, relValues);
}
return mRelList;
}
already_AddRefed<nsIURI>
HTMLLinkElement::GetHrefURI() const
{
return GetHrefURIForAnchors();
}
already_AddRefed<nsIURI>
HTMLLinkElement::GetStyleSheetURL(bool* aIsInline)
{
*aIsInline = false;
nsAutoString href;
GetAttr(kNameSpaceID_None, nsGkAtoms::href, href);
if (href.IsEmpty()) {
return nullptr;
}
nsCOMPtr<nsIURI> uri = Link::GetURI();
return uri.forget();
}
void
HTMLLinkElement::GetStyleSheetInfo(nsAString& aTitle,
nsAString& aType,
nsAString& aMedia,
bool* aIsScoped,
bool* aIsAlternate,
bool* aIsExplicitlyEnabled)
{
aTitle.Truncate();
aType.Truncate();
aMedia.Truncate();
*aIsScoped = false;
*aIsAlternate = false;
*aIsExplicitlyEnabled = false;
nsAutoString rel;
GetAttr(kNameSpaceID_None, nsGkAtoms::rel, rel);
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(rel, NodePrincipal());
// Is it a stylesheet link?
if (!(linkTypes & nsStyleLinkElement::eSTYLESHEET)) {
return;
}
if (LINK_DISABLED) {
// Is the link disabled?
if (Disabled()) {
return;
}
// Is it explicitly enabled?
if (mExplicitlyEnabled) {
*aIsExplicitlyEnabled = true;
}
}
nsAutoString title;
GetAttr(kNameSpaceID_None, nsGkAtoms::title, title);
title.CompressWhitespace();
aTitle.Assign(title);
// If alternate, does it have title?
if (linkTypes & nsStyleLinkElement::eALTERNATE) {
if (aTitle.IsEmpty()) { // alternates must have title
return;
} else {
*aIsAlternate = true;
}
}
GetAttr(kNameSpaceID_None, nsGkAtoms::media, aMedia);
// The HTML5 spec is formulated in terms of the CSSOM spec, which specifies
// that media queries should be ASCII lowercased during serialization.
nsContentUtils::ASCIIToLower(aMedia);
nsAutoString mimeType;
nsAutoString notUsed;
GetAttr(kNameSpaceID_None, nsGkAtoms::type, aType);
nsContentUtils::SplitMimeType(aType, mimeType, notUsed);
if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {
return;
}
// If we get here we assume that we're loading a css file, so set the
// type to 'text/css'
aType.AssignLiteral("text/css");
return;
}
CORSMode
HTMLLinkElement::GetCORSMode() const
{
return AttrValueToCORSMode(GetParsedAttr(nsGkAtoms::crossorigin));
}
EventStates
HTMLLinkElement::IntrinsicState() const
{
return Link::LinkState() | nsGenericHTMLElement::IntrinsicState();
}
size_t
HTMLLinkElement::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return nsGenericHTMLElement::SizeOfExcludingThis(aMallocSizeOf) +
Link::SizeOfExcludingThis(aMallocSizeOf);
}
JSObject*
HTMLLinkElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLLinkElementBinding::Wrap(aCx, this, aGivenProto);
}
already_AddRefed<nsIDocument>
HTMLLinkElement::GetImport()
{
return mImportLoader ? RefPtr<nsIDocument>(mImportLoader->GetImport()).forget() : nullptr;
}
} // namespace dom
} // namespace mozilla
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