зеркало из https://github.com/mozilla/gecko-dev.git
159 строки
5.9 KiB
C++
159 строки
5.9 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/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/Logging.h"
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#include "nsContentUtils.h"
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#include "nsStyleConsts.h"
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#include "nsIContentSecurityPolicy.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() {}
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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 && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
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content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(
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content);
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aDocument->SetHeaderData(nsGkAtoms::referrer, content);
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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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nsAutoString content;
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GetContent(content);
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nsContentUtils::ProcessViewportInfo(document, content);
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}
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CreateAndDispatchEvent(document, NS_LITERAL_STRING("DOMMetaChanged"));
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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(Document* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent) {
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nsresult rv =
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nsGenericHTMLElement::BindToTree(aDocument, aParent, aBindingParent);
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NS_ENSURE_SUCCESS(rv, rv);
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if (aDocument && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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nsGkAtoms::viewport, eIgnoreCase)) {
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nsAutoString content;
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GetContent(content);
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nsContentUtils::ProcessViewportInfo(aDocument, content);
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}
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if (StaticPrefs::security_csp_enable() && aDocument &&
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!aDocument->IsLoadedAsData() &&
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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 = aDocument->GetHeadElement();
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if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
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nsAutoString content;
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GetContent(content);
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content =
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nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(
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content);
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nsIPrincipal* principal = aDocument->NodePrincipal();
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nsCOMPtr<nsIContentSecurityPolicy> csp;
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principal->EnsureCSP(aDocument, getter_AddRefs(csp));
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if (csp) {
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if (LOG_ENABLED()) {
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nsAutoCString documentURIspec;
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nsIURI* documentURI = aDocument->GetDocumentURI();
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if (documentURI) {
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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(), aDocument,
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documentURIspec.get()));
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}
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// Multiple CSPs (delivered through either header of meta tag) need to
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// be joined together, see:
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// https://w3c.github.io/webappsec/specs/content-security-policy/#delivery-html-meta-element
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rv =
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csp->AppendPolicy(content,
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false, // csp via meta tag can not be report only
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true); // delivered through the meta tag
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NS_ENSURE_SUCCESS(rv, rv);
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aDocument->ApplySettingsFromCSP(false);
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}
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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(aDocument);
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CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMMetaAdded"));
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return rv;
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}
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void HTMLMetaElement::UnbindFromTree(bool aDeep, bool aNullParent) {
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nsCOMPtr<Document> oldDoc = GetUncomposedDoc();
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CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMMetaRemoved"));
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nsGenericHTMLElement::UnbindFromTree(aDeep, 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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} // namespace dom
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} // namespace mozilla
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