forked from mirrors/gecko-dev
176 lines
6.3 KiB
C++
176 lines
6.3 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 "nsStyleConsts.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 {
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namespace 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::SetMetaReferrer(Document* aDocument) {
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if (!aDocument || !AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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nsGkAtoms::referrer, eIgnoreCase)) {
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return;
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}
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nsAutoString content;
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GetContent(content);
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Element* headElt = aDocument->GetHeadElement();
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if (headElt && IsInclusiveDescendantOf(headElt)) {
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content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(
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content);
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aDocument->UpdateReferrerInfoFromMeta(content, false);
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}
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}
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nsresult 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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Document* document = GetUncomposedDoc();
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if (aName == nsGkAtoms::content) {
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if (document && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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nsGkAtoms::viewport, eIgnoreCase)) {
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ProcessViewportContent(document);
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}
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CreateAndDispatchEvent(document, u"DOMMetaChanged"_ns);
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} else if (document && aName == nsGkAtoms::name) {
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if (aValue && aValue->Equals(nsGkAtoms::viewport, eIgnoreCase)) {
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ProcessViewportContent(document);
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} else if (aOldValue &&
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aOldValue->Equals(nsGkAtoms::viewport, eIgnoreCase)) {
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DiscardViewportContent(document);
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}
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CreateAndDispatchEvent(document, u"DOMMetaChanged"_ns);
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}
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// Update referrer policy when it got changed from JS
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SetMetaReferrer(document);
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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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if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport,
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eIgnoreCase)) {
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ProcessViewportContent(&doc);
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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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// Referrer Policy spec requires a <meta name="referrer" tag to be in the
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// <head> element.
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SetMetaReferrer(&doc);
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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(bool aNullParent) {
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nsCOMPtr<Document> oldDoc = GetUncomposedDoc();
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if (oldDoc && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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nsGkAtoms::viewport, eIgnoreCase)) {
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DiscardViewportContent(oldDoc);
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}
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CreateAndDispatchEvent(oldDoc, u"DOMMetaRemoved"_ns);
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nsGenericHTMLElement::UnbindFromTree(aNullParent);
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}
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void HTMLMetaElement::CreateAndDispatchEvent(Document* aDoc,
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const nsAString& aEventName) {
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if (!aDoc) return;
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RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
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this, aEventName, CanBubble::eYes, ChromeOnlyDispatch::eYes);
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asyncDispatcher->RunDOMEventWhenSafe();
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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::ProcessViewportContent(Document* aDocument) {
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if (!HasAttr(kNameSpaceID_None, nsGkAtoms::content)) {
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// Call Document::RemoveMetaViewportElement for cases that the content
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// attribute is removed.
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// NOTE: RemoveMetaViewportElement enumerates all existing meta viewport
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// tags in the case where this element hasn't been there, i.e. this element
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// is newly added to the document, but it should be fine because a document
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// unlikely has a bunch of meta viewport tags.
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aDocument->RemoveMetaViewportElement(this);
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return;
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}
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nsAutoString content;
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GetContent(content);
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aDocument->SetHeaderData(nsGkAtoms::viewport, content);
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ViewportMetaData data(content);
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aDocument->AddMetaViewportElement(this, std::move(data));
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}
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void HTMLMetaElement::DiscardViewportContent(Document* aDocument) {
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aDocument->RemoveMetaViewportElement(this);
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}
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} // namespace dom
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} // namespace mozilla
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