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8925ee2d3d
Much like BindToTree. This will be useful because I need to pass more information through UnbindFromTree() to speed up dir=auto for bug 1874040. Differential Revision: https://phabricator.services.mozilla.com/D202215
179 lines
6.2 KiB
C++
179 lines
6.2 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/AsyncEventDispatcher.h"
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#include "mozilla/dom/BindContext.h"
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#include "mozilla/dom/HTMLMetaElement.h"
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#include "mozilla/dom/HTMLMetaElementBinding.h"
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#include "mozilla/dom/nsCSPService.h"
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#include "mozilla/dom/nsCSPUtils.h"
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#include "mozilla/dom/ViewportMetaData.h"
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#include "mozilla/Logging.h"
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#include "mozilla/StaticPrefs_security.h"
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#include "nsContentUtils.h"
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#include "nsSandboxFlags.h"
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#include "nsStyleConsts.h"
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#include "nsIXMLContentSink.h"
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static mozilla::LazyLogModule gMetaElementLog("nsMetaElement");
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#define LOG(msg) MOZ_LOG(gMetaElementLog, mozilla::LogLevel::Debug, msg)
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#define LOG_ENABLED() MOZ_LOG_TEST(gMetaElementLog, mozilla::LogLevel::Debug)
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NS_IMPL_NS_NEW_HTML_ELEMENT(Meta)
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namespace mozilla::dom {
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HTMLMetaElement::HTMLMetaElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: nsGenericHTMLElement(std::move(aNodeInfo)) {}
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HTMLMetaElement::~HTMLMetaElement() = default;
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NS_IMPL_ELEMENT_CLONE(HTMLMetaElement)
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void HTMLMetaElement::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) {
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if (Document* document = GetUncomposedDoc()) {
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if (aName == nsGkAtoms::content) {
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if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) {
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MetaAddedOrChanged(*document, *name, ChangeKind::ContentChange);
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}
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CreateAndDispatchEvent(*document, u"DOMMetaChanged"_ns);
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} else if (aName == nsGkAtoms::name) {
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if (aOldValue) {
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MetaRemoved(*document, *aOldValue, ChangeKind::NameChange);
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}
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if (aValue) {
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MetaAddedOrChanged(*document, *aValue, ChangeKind::NameChange);
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}
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CreateAndDispatchEvent(*document, u"DOMMetaChanged"_ns);
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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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nsresult HTMLMetaElement::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 (!IsInUncomposedDoc()) {
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return rv;
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}
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Document& doc = aContext.OwnerDoc();
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bool shouldProcessMeta = true;
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// We don't want to call ProcessMETATag when we are pretty print
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// the document
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if (doc.IsXMLDocument()) {
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if (nsCOMPtr<nsIXMLContentSink> xmlSink =
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do_QueryInterface(doc.GetCurrentContentSink())) {
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if (xmlSink->IsPrettyPrintXML() &&
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xmlSink->IsPrettyPrintHasSpecialRoot()) {
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shouldProcessMeta = false;
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}
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}
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}
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if (shouldProcessMeta) {
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doc.ProcessMETATag(this);
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}
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if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::httpEquiv, nsGkAtoms::headerCSP,
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eIgnoreCase)) {
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// only accept <meta http-equiv="Content-Security-Policy" content=""> if it
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// appears in the <head> element.
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Element* headElt = doc.GetHeadElement();
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if (headElt && IsInclusiveDescendantOf(headElt)) {
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nsAutoString content;
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GetContent(content);
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if (LOG_ENABLED()) {
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nsAutoCString documentURIspec;
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if (nsIURI* documentURI = doc.GetDocumentURI()) {
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documentURI->GetAsciiSpec(documentURIspec);
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}
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LOG(
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("HTMLMetaElement %p sets CSP '%s' on document=%p, "
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"document-uri=%s",
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this, NS_ConvertUTF16toUTF8(content).get(), &doc,
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documentURIspec.get()));
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}
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CSP_ApplyMetaCSPToDoc(doc, content);
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}
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}
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if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) {
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MetaAddedOrChanged(doc, *name, ChangeKind::TreeChange);
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}
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CreateAndDispatchEvent(doc, u"DOMMetaAdded"_ns);
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return rv;
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}
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void HTMLMetaElement::UnbindFromTree(UnbindContext& aContext) {
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if (Document* oldDoc = GetUncomposedDoc()) {
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if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) {
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MetaRemoved(*oldDoc, *name, ChangeKind::TreeChange);
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}
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CreateAndDispatchEvent(*oldDoc, u"DOMMetaRemoved"_ns);
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}
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nsGenericHTMLElement::UnbindFromTree(aContext);
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}
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void HTMLMetaElement::CreateAndDispatchEvent(Document&,
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const nsAString& aEventName) {
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AsyncEventDispatcher::RunDOMEventWhenSafe(*this, aEventName, CanBubble::eYes,
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ChromeOnlyDispatch::eYes);
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}
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JSObject* HTMLMetaElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return HTMLMetaElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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void HTMLMetaElement::MetaAddedOrChanged(Document& aDoc,
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const nsAttrValue& aName,
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ChangeKind aChangeKind) {
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nsAutoString content;
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const bool hasContent = GetAttr(nsGkAtoms::content, content);
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if (aName.Equals(nsGkAtoms::viewport, eIgnoreCase)) {
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if (hasContent) {
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aDoc.SetMetaViewportData(MakeUnique<ViewportMetaData>(content));
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}
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return;
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}
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if (aName.Equals(nsGkAtoms::referrer, eIgnoreCase)) {
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content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(
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content);
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return aDoc.UpdateReferrerInfoFromMeta(content,
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/* aPreload = */ false);
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}
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if (aName.Equals(nsGkAtoms::color_scheme, eIgnoreCase)) {
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if (aChangeKind != ChangeKind::ContentChange) {
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return aDoc.AddColorSchemeMeta(*this);
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}
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return aDoc.RecomputeColorScheme();
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}
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}
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void HTMLMetaElement::MetaRemoved(Document& aDoc, const nsAttrValue& aName,
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ChangeKind aChangeKind) {
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MOZ_ASSERT(aChangeKind != ChangeKind::ContentChange,
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"Content change can't trigger removal");
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if (aName.Equals(nsGkAtoms::color_scheme, eIgnoreCase)) {
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return aDoc.RemoveColorSchemeMeta(*this);
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}
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}
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} // namespace mozilla::dom
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