mirror of
https://github.com/mozilla/gecko-dev.git
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1312eb3dff
Split the rel=dns-prefetch behaviour from the Dom's speculative DNS prefetch for all anchor elements. This will allow us to independently enable rel=dns-prefetch for https document without prefetching DNS for anchors. This patch does not change the behaviour for either source of DNS prefetch. Differential Revision: https://phabricator.services.mozilla.com/D205630
722 lines
23 KiB
C++
722 lines
23 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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#include "mozilla/dom/HTMLLinkElement.h"
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#include "mozilla/AsyncEventDispatcher.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Components.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/StaticPrefs_dom.h"
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#include "mozilla/StaticPrefs_network.h"
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#include "mozilla/dom/BindContext.h"
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#include "mozilla/dom/DocumentInlines.h"
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#include "mozilla/dom/HTMLLinkElementBinding.h"
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#include "mozilla/dom/HTMLDNSPrefetch.h"
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#include "mozilla/dom/ReferrerInfo.h"
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#include "mozilla/dom/ScriptLoader.h"
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#include "nsContentUtils.h"
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#include "nsDOMTokenList.h"
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#include "nsGenericHTMLElement.h"
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#include "nsGkAtoms.h"
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#include "nsIContentInlines.h"
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#include "mozilla/dom/Document.h"
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#include "nsINode.h"
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#include "nsIPrefetchService.h"
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#include "nsISizeOf.h"
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#include "nsPIDOMWindow.h"
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#include "nsReadableUtils.h"
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#include "nsStyleConsts.h"
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#include "nsUnicharUtils.h"
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#include "nsWindowSizes.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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NS_IMPL_NS_NEW_HTML_ELEMENT(Link)
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namespace mozilla::dom {
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HTMLLinkElement::HTMLLinkElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: nsGenericHTMLElement(std::move(aNodeInfo)) {}
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HTMLLinkElement::~HTMLLinkElement() { SupportsDNSPrefetch::Destroyed(*this); }
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NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLLinkElement)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLLinkElement,
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nsGenericHTMLElement)
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tmp->LinkStyle::Traverse(cb);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRelList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSizes)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBlocking)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLLinkElement,
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nsGenericHTMLElement)
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tmp->LinkStyle::Unlink();
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mRelList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mSizes)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mBlocking)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(HTMLLinkElement,
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nsGenericHTMLElement)
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NS_IMPL_ELEMENT_CLONE(HTMLLinkElement)
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bool HTMLLinkElement::Disabled() const {
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return GetBoolAttr(nsGkAtoms::disabled);
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}
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void HTMLLinkElement::SetDisabled(bool aDisabled, ErrorResult& aRv) {
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return SetHTMLBoolAttr(nsGkAtoms::disabled, aDisabled, aRv);
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}
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nsresult HTMLLinkElement::BindToTree(BindContext& aContext, nsINode& aParent) {
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nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
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NS_ENSURE_SUCCESS(rv, rv);
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if (IsInComposedDoc()) {
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TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
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}
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LinkStyle::BindToTree();
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if (IsInUncomposedDoc()) {
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if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
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eIgnoreCase)) {
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aContext.OwnerDoc().LocalizationLinkAdded(this);
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}
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LinkAdded();
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}
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return rv;
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}
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void HTMLLinkElement::LinkAdded() {
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CreateAndDispatchEvent(u"DOMLinkAdded"_ns);
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}
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void HTMLLinkElement::UnbindFromTree(UnbindContext& aContext) {
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CancelDNSPrefetch(*this);
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CancelPrefetchOrPreload();
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// If this is reinserted back into the document it will not be
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// from the parser.
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Document* oldDoc = GetUncomposedDoc();
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ShadowRoot* oldShadowRoot = GetContainingShadow();
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// We want to update the localization but only if the link is removed from a
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// DOM change, and not because the document is going away.
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bool ignore;
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if (oldDoc) {
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if (oldDoc->GetScriptHandlingObject(ignore) &&
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AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
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eIgnoreCase)) {
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oldDoc->LocalizationLinkRemoved(this);
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}
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}
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nsGenericHTMLElement::UnbindFromTree(aContext);
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Unused << UpdateStyleSheetInternal(oldDoc, oldShadowRoot);
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}
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bool HTMLLinkElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAString& aValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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nsAttrValue& aResult) {
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if (aNamespaceID == kNameSpaceID_None) {
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if (aAttribute == nsGkAtoms::crossorigin) {
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ParseCORSValue(aValue, aResult);
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return true;
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}
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if (aAttribute == nsGkAtoms::as) {
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net::ParseAsValue(aValue, aResult);
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return true;
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}
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if (aAttribute == nsGkAtoms::sizes) {
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aResult.ParseAtomArray(aValue);
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return true;
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}
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if (aAttribute == nsGkAtoms::integrity) {
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aResult.ParseStringOrAtom(aValue);
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return true;
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}
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if (aAttribute == nsGkAtoms::fetchpriority) {
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ParseFetchPriority(aValue, aResult);
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return true;
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}
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if (aAttribute == nsGkAtoms::blocking &&
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StaticPrefs::dom_element_blocking_enabled()) {
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aResult.ParseAtomArray(aValue);
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return true;
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}
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}
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return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
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aMaybeScriptedPrincipal, aResult);
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}
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void HTMLLinkElement::CreateAndDispatchEvent(const nsAString& aEventName) {
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MOZ_ASSERT(IsInUncomposedDoc());
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// In the unlikely case that both rev is specified *and* rel=stylesheet,
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// this code will cause the event to fire, on the principle that maybe the
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// page really does want to specify that its author is a stylesheet. Since
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// this should never actually happen and the performance hit is minimal,
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// doing the "right" thing costs virtually nothing here, even if it doesn't
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// make much sense.
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static AttrArray::AttrValuesArray strings[] = {
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nsGkAtoms::_empty, nsGkAtoms::stylesheet, nullptr};
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if (!nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,
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nsGkAtoms::rev) &&
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FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::rel, strings,
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eIgnoreCase) != AttrArray::ATTR_VALUE_NO_MATCH) {
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return;
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}
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RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
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this, aEventName, CanBubble::eYes, ChromeOnlyDispatch::eYes);
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// Always run async in order to avoid running script when the content
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// sink isn't expecting it.
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asyncDispatcher->PostDOMEvent();
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}
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void HTMLLinkElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue, bool aNotify) {
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if (aNameSpaceID == kNameSpaceID_None &&
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(aName == nsGkAtoms::href || aName == nsGkAtoms::rel)) {
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CancelDNSPrefetch(*this);
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CancelPrefetchOrPreload();
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}
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return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
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aNotify);
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}
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void HTMLLinkElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify) {
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if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href) {
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mCachedURI = nullptr;
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if (IsInUncomposedDoc()) {
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CreateAndDispatchEvent(u"DOMLinkChanged"_ns);
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}
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mTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
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this, aValue ? aValue->GetStringValue() : EmptyString(),
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aSubjectPrincipal);
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// If the link has `rel=localization` and its `href` attribute is changed,
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// update the list of localization links.
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if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
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eIgnoreCase)) {
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if (Document* doc = GetUncomposedDoc()) {
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if (aOldValue) {
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doc->LocalizationLinkRemoved(this);
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}
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if (aValue) {
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doc->LocalizationLinkAdded(this);
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}
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}
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}
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}
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// If a link's `rel` attribute was changed from or to `localization`,
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// update the list of localization links.
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if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::rel) {
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if (Document* doc = GetUncomposedDoc()) {
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if ((aValue && aValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
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(!aOldValue ||
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!aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
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doc->LocalizationLinkAdded(this);
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} else if ((aOldValue &&
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aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
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(!aValue ||
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!aValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
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doc->LocalizationLinkRemoved(this);
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}
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}
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}
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if (aValue) {
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if (aNameSpaceID == kNameSpaceID_None &&
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(aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
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aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
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aName == nsGkAtoms::type || aName == nsGkAtoms::as ||
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aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::disabled)) {
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bool dropSheet = false;
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if (aName == nsGkAtoms::rel) {
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nsAutoString value;
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aValue->ToString(value);
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uint32_t linkTypes = ParseLinkTypes(value);
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if (GetSheet()) {
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dropSheet = !(linkTypes & eSTYLESHEET);
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}
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}
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if ((aName == nsGkAtoms::rel || aName == nsGkAtoms::href) &&
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IsInComposedDoc()) {
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TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
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}
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if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
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aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
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IsInComposedDoc()) {
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UpdatePreload(aName, aValue, aOldValue);
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}
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const bool forceUpdate =
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dropSheet || aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
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aName == nsGkAtoms::type || aName == nsGkAtoms::disabled;
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Unused << UpdateStyleSheetInternal(
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nullptr, nullptr, forceUpdate ? ForceUpdate::Yes : ForceUpdate::No);
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}
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} else {
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if (aNameSpaceID == kNameSpaceID_None) {
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if (aName == nsGkAtoms::disabled) {
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mExplicitlyEnabled = true;
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}
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// Since removing href or rel makes us no longer link to a stylesheet,
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// force updates for those too.
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if (aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
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aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
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aName == nsGkAtoms::type || aName == nsGkAtoms::disabled) {
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Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
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}
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if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
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aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
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IsInComposedDoc()) {
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UpdatePreload(aName, aValue, aOldValue);
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}
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}
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}
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return nsGenericHTMLElement::AfterSetAttr(
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aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
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}
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// Keep this and the arrays below in sync with ToLinkMask in LinkStyle.cpp.
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#define SUPPORTED_REL_VALUES_BASE \
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"preload", "prefetch", "dns-prefetch", "stylesheet", "next", "alternate", \
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"preconnect", "icon", "search", nullptr
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static const DOMTokenListSupportedToken sSupportedRelValueCombinations[][12] = {
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{SUPPORTED_REL_VALUES_BASE},
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{"manifest", SUPPORTED_REL_VALUES_BASE},
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{"modulepreload", SUPPORTED_REL_VALUES_BASE},
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{"modulepreload", "manifest", SUPPORTED_REL_VALUES_BASE}};
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#undef SUPPORTED_REL_VALUES_BASE
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nsDOMTokenList* HTMLLinkElement::RelList() {
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if (!mRelList) {
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int index = (StaticPrefs::dom_manifest_enabled() ? 1 : 0) |
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(StaticPrefs::network_modulepreload() ? 2 : 0);
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mRelList = new nsDOMTokenList(this, nsGkAtoms::rel,
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sSupportedRelValueCombinations[index]);
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}
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return mRelList;
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}
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Maybe<LinkStyle::SheetInfo> HTMLLinkElement::GetStyleSheetInfo() {
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nsAutoString rel;
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GetAttr(nsGkAtoms::rel, rel);
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uint32_t linkTypes = ParseLinkTypes(rel);
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if (!(linkTypes & eSTYLESHEET)) {
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return Nothing();
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}
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if (!IsCSSMimeTypeAttributeForLinkElement(*this)) {
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return Nothing();
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}
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if (Disabled()) {
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return Nothing();
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}
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nsAutoString title;
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nsAutoString media;
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GetTitleAndMediaForElement(*this, title, media);
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bool alternate = linkTypes & eALTERNATE;
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if (alternate && title.IsEmpty()) {
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// alternates must have title.
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return Nothing();
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}
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if (!HasNonEmptyAttr(nsGkAtoms::href)) {
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return Nothing();
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}
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nsAutoString integrity;
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GetAttr(nsGkAtoms::integrity, integrity);
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nsCOMPtr<nsIURI> uri = GetURI();
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nsCOMPtr<nsIPrincipal> prin = mTriggeringPrincipal;
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nsAutoString nonce;
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nsString* cspNonce = static_cast<nsString*>(GetProperty(nsGkAtoms::nonce));
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if (cspNonce) {
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nonce = *cspNonce;
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}
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return Some(SheetInfo{
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*OwnerDoc(),
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this,
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uri.forget(),
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prin.forget(),
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MakeAndAddRef<ReferrerInfo>(*this),
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GetCORSMode(),
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title,
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media,
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integrity,
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nonce,
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alternate ? HasAlternateRel::Yes : HasAlternateRel::No,
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IsInline::No,
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mExplicitlyEnabled ? IsExplicitlyEnabled::Yes : IsExplicitlyEnabled::No,
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GetFetchPriority(),
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});
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}
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void HTMLLinkElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
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size_t* aNodeSize) const {
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nsGenericHTMLElement::AddSizeOfExcludingThis(aSizes, aNodeSize);
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if (nsCOMPtr<nsISizeOf> iface = do_QueryInterface(mCachedURI)) {
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*aNodeSize += iface->SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
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}
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}
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JSObject* HTMLLinkElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return HTMLLinkElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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void HTMLLinkElement::GetAs(nsAString& aResult) {
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GetEnumAttr(nsGkAtoms::as, "", aResult);
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}
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void HTMLLinkElement::GetContentPolicyMimeTypeMedia(
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nsAttrValue& aAsAttr, nsContentPolicyType& aPolicyType, nsString& aMimeType,
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nsAString& aMedia) {
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nsAutoString as;
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GetAttr(nsGkAtoms::as, as);
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net::ParseAsValue(as, aAsAttr);
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aPolicyType = net::AsValueToContentPolicy(aAsAttr);
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nsAutoString type;
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GetAttr(nsGkAtoms::type, type);
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nsAutoString notUsed;
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nsContentUtils::SplitMimeType(type, aMimeType, notUsed);
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GetAttr(nsGkAtoms::media, aMedia);
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}
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void HTMLLinkElement::
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TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender() {
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MOZ_ASSERT(IsInComposedDoc());
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if (!HasAttr(nsGkAtoms::href)) {
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return;
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}
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nsAutoString rel;
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if (!GetAttr(nsGkAtoms::rel, rel)) {
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return;
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}
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if (!nsContentUtils::PrefetchPreloadEnabled(OwnerDoc()->GetDocShell())) {
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return;
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}
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uint32_t linkTypes = ParseLinkTypes(rel);
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if ((linkTypes & ePREFETCH) || (linkTypes & eNEXT)) {
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nsCOMPtr<nsIPrefetchService> prefetchService(
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components::Prefetch::Service());
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if (prefetchService) {
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if (nsCOMPtr<nsIURI> uri = GetURI()) {
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auto referrerInfo = MakeRefPtr<ReferrerInfo>(*this);
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prefetchService->PrefetchURI(uri, referrerInfo, this,
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linkTypes & ePREFETCH);
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return;
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}
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}
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}
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if (linkTypes & ePRELOAD) {
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if (nsCOMPtr<nsIURI> uri = GetURI()) {
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nsContentPolicyType policyType;
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nsAttrValue asAttr;
|
|
nsAutoString mimeType;
|
|
nsAutoString media;
|
|
GetContentPolicyMimeTypeMedia(asAttr, policyType, mimeType, media);
|
|
|
|
if (policyType == nsIContentPolicy::TYPE_INVALID ||
|
|
!net::CheckPreloadAttrs(asAttr, mimeType, media, OwnerDoc())) {
|
|
// Ignore preload with a wrong or empty as attribute.
|
|
net::WarnIgnoredPreload(*OwnerDoc(), *uri);
|
|
return;
|
|
}
|
|
|
|
StartPreload(policyType);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (linkTypes & eMODULE_PRELOAD) {
|
|
ScriptLoader* scriptLoader = OwnerDoc()->ScriptLoader();
|
|
ModuleLoader* moduleLoader = scriptLoader->GetModuleLoader();
|
|
|
|
if (!moduleLoader) {
|
|
// For the print preview documents, at this moment it doesn't have module
|
|
// loader yet, as the (print preview) document is not attached to the
|
|
// nsIDocumentViewer yet, so it doesn't have the GlobalObject.
|
|
// Also, the script elements won't be processed as they are also cloned
|
|
// from the original document.
|
|
// So we simply bail out if the module loader is null.
|
|
return;
|
|
}
|
|
|
|
if (!StaticPrefs::network_modulepreload()) {
|
|
// Keep behavior from https://phabricator.services.mozilla.com/D149371,
|
|
// prior to main implementation of modulepreload
|
|
moduleLoader->DisallowImportMaps();
|
|
return;
|
|
}
|
|
|
|
// https://html.spec.whatwg.org/multipage/semantics.html#processing-the-media-attribute
|
|
// TODO: apply this check for all linkTypes
|
|
nsAutoString media;
|
|
if (GetAttr(nsGkAtoms::media, media)) {
|
|
RefPtr<mozilla::dom::MediaList> mediaList =
|
|
mozilla::dom::MediaList::Create(NS_ConvertUTF16toUTF8(media));
|
|
if (!mediaList->Matches(*OwnerDoc())) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// TODO: per spec, apply this check for ePREFETCH as well
|
|
if (!HasNonEmptyAttr(nsGkAtoms::href)) {
|
|
return;
|
|
}
|
|
|
|
nsAutoString as;
|
|
GetAttr(nsGkAtoms::as, as);
|
|
|
|
if (!net::IsScriptLikeOrInvalid(as)) {
|
|
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
|
|
this, u"error"_ns, CanBubble::eNo, ChromeOnlyDispatch::eNo);
|
|
asyncDispatcher->PostDOMEvent();
|
|
return;
|
|
}
|
|
|
|
nsCOMPtr<nsIURI> uri = GetURI();
|
|
if (!uri) {
|
|
return;
|
|
}
|
|
|
|
// https://html.spec.whatwg.org/multipage/webappapis.html#fetch-a-modulepreload-module-script-graph
|
|
// Step 1. Disallow further import maps given settings object.
|
|
moduleLoader->DisallowImportMaps();
|
|
|
|
StartPreload(nsIContentPolicy::TYPE_SCRIPT);
|
|
return;
|
|
}
|
|
|
|
if (linkTypes & ePRECONNECT) {
|
|
if (nsCOMPtr<nsIURI> uri = GetURI()) {
|
|
OwnerDoc()->MaybePreconnect(
|
|
uri, AttrValueToCORSMode(GetParsedAttr(nsGkAtoms::crossorigin)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (linkTypes & eDNS_PREFETCH) {
|
|
TryDNSPrefetch(*this, HTMLDNSPrefetch::PrefetchSource::LinkDnsPrefetch);
|
|
}
|
|
}
|
|
|
|
void HTMLLinkElement::UpdatePreload(nsAtom* aName, const nsAttrValue* aValue,
|
|
const nsAttrValue* aOldValue) {
|
|
MOZ_ASSERT(IsInComposedDoc());
|
|
|
|
if (!HasAttr(nsGkAtoms::href)) {
|
|
return;
|
|
}
|
|
|
|
nsAutoString rel;
|
|
if (!GetAttr(nsGkAtoms::rel, rel)) {
|
|
return;
|
|
}
|
|
|
|
if (!nsContentUtils::PrefetchPreloadEnabled(OwnerDoc()->GetDocShell())) {
|
|
return;
|
|
}
|
|
|
|
uint32_t linkTypes = ParseLinkTypes(rel);
|
|
|
|
if (!(linkTypes & ePRELOAD)) {
|
|
return;
|
|
}
|
|
|
|
nsCOMPtr<nsIURI> uri = GetURI();
|
|
if (!uri) {
|
|
return;
|
|
}
|
|
|
|
nsAttrValue asAttr;
|
|
nsContentPolicyType asPolicyType;
|
|
nsAutoString mimeType;
|
|
nsAutoString media;
|
|
GetContentPolicyMimeTypeMedia(asAttr, asPolicyType, mimeType, media);
|
|
|
|
if (asPolicyType == nsIContentPolicy::TYPE_INVALID ||
|
|
!net::CheckPreloadAttrs(asAttr, mimeType, media, OwnerDoc())) {
|
|
// Ignore preload with a wrong or empty as attribute, but be sure to cancel
|
|
// the old one.
|
|
CancelPrefetchOrPreload();
|
|
net::WarnIgnoredPreload(*OwnerDoc(), *uri);
|
|
return;
|
|
}
|
|
|
|
if (aName == nsGkAtoms::crossorigin) {
|
|
CORSMode corsMode = AttrValueToCORSMode(aValue);
|
|
CORSMode oldCorsMode = AttrValueToCORSMode(aOldValue);
|
|
if (corsMode != oldCorsMode) {
|
|
CancelPrefetchOrPreload();
|
|
StartPreload(asPolicyType);
|
|
}
|
|
return;
|
|
}
|
|
|
|
nsContentPolicyType oldPolicyType;
|
|
|
|
if (aName == nsGkAtoms::as) {
|
|
if (aOldValue) {
|
|
oldPolicyType = net::AsValueToContentPolicy(*aOldValue);
|
|
if (!net::CheckPreloadAttrs(*aOldValue, mimeType, media, OwnerDoc())) {
|
|
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
|
|
}
|
|
} else {
|
|
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
|
|
}
|
|
} else if (aName == nsGkAtoms::type) {
|
|
nsAutoString oldType;
|
|
nsAutoString notUsed;
|
|
if (aOldValue) {
|
|
aOldValue->ToString(oldType);
|
|
}
|
|
nsAutoString oldMimeType;
|
|
nsContentUtils::SplitMimeType(oldType, oldMimeType, notUsed);
|
|
if (net::CheckPreloadAttrs(asAttr, oldMimeType, media, OwnerDoc())) {
|
|
oldPolicyType = asPolicyType;
|
|
} else {
|
|
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
|
|
}
|
|
} else {
|
|
MOZ_ASSERT(aName == nsGkAtoms::media);
|
|
nsAutoString oldMedia;
|
|
if (aOldValue) {
|
|
aOldValue->ToString(oldMedia);
|
|
}
|
|
if (net::CheckPreloadAttrs(asAttr, mimeType, oldMedia, OwnerDoc())) {
|
|
oldPolicyType = asPolicyType;
|
|
} else {
|
|
oldPolicyType = nsIContentPolicy::TYPE_INVALID;
|
|
}
|
|
}
|
|
|
|
if (asPolicyType != oldPolicyType &&
|
|
oldPolicyType != nsIContentPolicy::TYPE_INVALID) {
|
|
CancelPrefetchOrPreload();
|
|
}
|
|
|
|
// Trigger a new preload if the policy type has changed.
|
|
if (asPolicyType != oldPolicyType) {
|
|
StartPreload(asPolicyType);
|
|
}
|
|
}
|
|
|
|
void HTMLLinkElement::CancelPrefetchOrPreload() {
|
|
CancelPreload();
|
|
|
|
nsCOMPtr<nsIPrefetchService> prefetchService(components::Prefetch::Service());
|
|
if (prefetchService) {
|
|
if (nsCOMPtr<nsIURI> uri = GetURI()) {
|
|
prefetchService->CancelPrefetchPreloadURI(uri, this);
|
|
}
|
|
}
|
|
}
|
|
|
|
void HTMLLinkElement::StartPreload(nsContentPolicyType aPolicyType) {
|
|
MOZ_ASSERT(!mPreload, "Forgot to cancel the running preload");
|
|
RefPtr<PreloaderBase> preload =
|
|
OwnerDoc()->Preloads().PreloadLinkElement(this, aPolicyType);
|
|
mPreload = preload.get();
|
|
}
|
|
|
|
void HTMLLinkElement::CancelPreload() {
|
|
if (mPreload) {
|
|
// This will cancel the loading channel if this was the last referred node
|
|
// and the preload is not used up until now to satisfy a regular tag load
|
|
// request.
|
|
mPreload->RemoveLinkPreloadNode(this);
|
|
mPreload = nullptr;
|
|
}
|
|
}
|
|
|
|
bool HTMLLinkElement::IsCSSMimeTypeAttributeForLinkElement(
|
|
const Element& aSelf) {
|
|
// Processing the type attribute per
|
|
// https://html.spec.whatwg.org/multipage/semantics.html#processing-the-type-attribute
|
|
// for HTML link elements.
|
|
nsAutoString type;
|
|
nsAutoString mimeType;
|
|
nsAutoString notUsed;
|
|
aSelf.GetAttr(nsGkAtoms::type, type);
|
|
nsContentUtils::SplitMimeType(type, mimeType, notUsed);
|
|
return mimeType.IsEmpty() || mimeType.LowerCaseEqualsLiteral("text/css");
|
|
}
|
|
|
|
nsDOMTokenList* HTMLLinkElement::Blocking() {
|
|
if (!mBlocking) {
|
|
mBlocking =
|
|
new nsDOMTokenList(this, nsGkAtoms::blocking, sSupportedBlockingValues);
|
|
}
|
|
return mBlocking;
|
|
}
|
|
|
|
bool HTMLLinkElement::IsPotentiallyRenderBlocking() {
|
|
return BlockingContainsRender();
|
|
|
|
// TODO: handle implicitly potentially render blocking
|
|
// https://html.spec.whatwg.org/#implicitly-potentially-render-blocking
|
|
// The default type for resources given by the stylesheet keyword is text/css.
|
|
// A link element of this type is implicitly potentially render-blocking if
|
|
// the element was created by its node document's parser.
|
|
}
|
|
|
|
} // namespace mozilla::dom
|