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Diffstat (limited to '')
| -rw-r--r-- | dom/html/HTMLMetaElement.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/dom/html/HTMLMetaElement.cpp b/dom/html/HTMLMetaElement.cpp new file mode 100644 index 0000000000..b99ffabdaf --- /dev/null +++ b/dom/html/HTMLMetaElement.cpp @@ -0,0 +1,178 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/AsyncEventDispatcher.h" +#include "mozilla/dom/BindContext.h" +#include "mozilla/dom/HTMLMetaElement.h" +#include "mozilla/dom/HTMLMetaElementBinding.h" +#include "mozilla/dom/nsCSPService.h" +#include "mozilla/dom/nsCSPUtils.h" +#include "mozilla/dom/ViewportMetaData.h" +#include "mozilla/Logging.h" +#include "mozilla/StaticPrefs_security.h" +#include "nsContentUtils.h" +#include "nsSandboxFlags.h" +#include "nsStyleConsts.h" +#include "nsIXMLContentSink.h" + +static mozilla::LazyLogModule gMetaElementLog("nsMetaElement"); +#define LOG(msg) MOZ_LOG(gMetaElementLog, mozilla::LogLevel::Debug, msg) +#define LOG_ENABLED() MOZ_LOG_TEST(gMetaElementLog, mozilla::LogLevel::Debug) + +NS_IMPL_NS_NEW_HTML_ELEMENT(Meta) + +namespace mozilla::dom { + +HTMLMetaElement::HTMLMetaElement( + already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) + : nsGenericHTMLElement(std::move(aNodeInfo)) {} + +HTMLMetaElement::~HTMLMetaElement() = default; + +NS_IMPL_ELEMENT_CLONE(HTMLMetaElement) + +void HTMLMetaElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName, + const nsAttrValue* aValue, + const nsAttrValue* aOldValue, + nsIPrincipal* aSubjectPrincipal, + bool aNotify) { + if (aNameSpaceID == kNameSpaceID_None) { + if (Document* document = GetUncomposedDoc()) { + if (aName == nsGkAtoms::content) { + if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) { + MetaAddedOrChanged(*document, *name, ChangeKind::ContentChange); + } + CreateAndDispatchEvent(*document, u"DOMMetaChanged"_ns); + } else if (aName == nsGkAtoms::name) { + if (aOldValue) { + MetaRemoved(*document, *aOldValue, ChangeKind::NameChange); + } + if (aValue) { + MetaAddedOrChanged(*document, *aValue, ChangeKind::NameChange); + } + CreateAndDispatchEvent(*document, u"DOMMetaChanged"_ns); + } + } + } + + return nsGenericHTMLElement::AfterSetAttr( + aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify); +} + +nsresult HTMLMetaElement::BindToTree(BindContext& aContext, nsINode& aParent) { + nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent); + NS_ENSURE_SUCCESS(rv, rv); + if (!IsInUncomposedDoc()) { + return rv; + } + Document& doc = aContext.OwnerDoc(); + + bool shouldProcessMeta = true; + // We don't want to call ProcessMETATag when we are pretty print + // the document + if (doc.IsXMLDocument()) { + if (nsCOMPtr<nsIXMLContentSink> xmlSink = + do_QueryInterface(doc.GetCurrentContentSink())) { + if (xmlSink->IsPrettyPrintXML() && + xmlSink->IsPrettyPrintHasSpecialRoot()) { + shouldProcessMeta = false; + } + } + } + + if (shouldProcessMeta) { + doc.ProcessMETATag(this); + } + + if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::httpEquiv, nsGkAtoms::headerCSP, + eIgnoreCase)) { + // only accept <meta http-equiv="Content-Security-Policy" content=""> if it + // appears in the <head> element. + Element* headElt = doc.GetHeadElement(); + if (headElt && IsInclusiveDescendantOf(headElt)) { + nsAutoString content; + GetContent(content); + + if (LOG_ENABLED()) { + nsAutoCString documentURIspec; + if (nsIURI* documentURI = doc.GetDocumentURI()) { + documentURI->GetAsciiSpec(documentURIspec); + } + + LOG( + ("HTMLMetaElement %p sets CSP '%s' on document=%p, " + "document-uri=%s", + this, NS_ConvertUTF16toUTF8(content).get(), &doc, + documentURIspec.get())); + } + CSP_ApplyMetaCSPToDoc(doc, content); + } + } + + if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) { + MetaAddedOrChanged(doc, *name, ChangeKind::TreeChange); + } + CreateAndDispatchEvent(doc, u"DOMMetaAdded"_ns); + return rv; +} + +void HTMLMetaElement::UnbindFromTree(bool aNullParent) { + if (Document* oldDoc = GetUncomposedDoc()) { + if (const nsAttrValue* name = GetParsedAttr(nsGkAtoms::name)) { + MetaRemoved(*oldDoc, *name, ChangeKind::TreeChange); + } + CreateAndDispatchEvent(*oldDoc, u"DOMMetaRemoved"_ns); + } + nsGenericHTMLElement::UnbindFromTree(aNullParent); +} + +void HTMLMetaElement::CreateAndDispatchEvent(Document&, + const nsAString& aEventName) { + AsyncEventDispatcher::RunDOMEventWhenSafe(*this, aEventName, CanBubble::eYes, + ChromeOnlyDispatch::eYes); +} + +JSObject* HTMLMetaElement::WrapNode(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) { + return HTMLMetaElement_Binding::Wrap(aCx, this, aGivenProto); +} + +void HTMLMetaElement::MetaAddedOrChanged(Document& aDoc, + const nsAttrValue& aName, + ChangeKind aChangeKind) { + nsAutoString content; + const bool hasContent = GetAttr(nsGkAtoms::content, content); + if (aName.Equals(nsGkAtoms::viewport, eIgnoreCase)) { + if (hasContent) { + aDoc.SetMetaViewportData(MakeUnique<ViewportMetaData>(content)); + } + return; + } + + if (aName.Equals(nsGkAtoms::referrer, eIgnoreCase)) { + content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>( + content); + return aDoc.UpdateReferrerInfoFromMeta(content, + /* aPreload = */ false); + } + if (aName.Equals(nsGkAtoms::color_scheme, eIgnoreCase)) { + if (aChangeKind != ChangeKind::ContentChange) { + return aDoc.AddColorSchemeMeta(*this); + } + return aDoc.RecomputeColorScheme(); + } +} + +void HTMLMetaElement::MetaRemoved(Document& aDoc, const nsAttrValue& aName, + ChangeKind aChangeKind) { + MOZ_ASSERT(aChangeKind != ChangeKind::ContentChange, + "Content change can't trigger removal"); + if (aName.Equals(nsGkAtoms::color_scheme, eIgnoreCase)) { + return aDoc.RemoveColorSchemeMeta(*this); + } +} + +} // namespace mozilla::dom |