/* -*- 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/HTMLMetaElement.h" #include "mozilla/dom/HTMLMetaElementBinding.h" #include "mozilla/dom/nsCSPService.h" #include "mozilla/Logging.h" #include "nsContentUtils.h" #include "nsStyleConsts.h" #include "nsIContentSecurityPolicy.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 { namespace dom { HTMLMetaElement::HTMLMetaElement( already_AddRefed&& aNodeInfo) : nsGenericHTMLElement(std::move(aNodeInfo)) {} HTMLMetaElement::~HTMLMetaElement() {} NS_IMPL_ELEMENT_CLONE(HTMLMetaElement) void HTMLMetaElement::SetMetaReferrer(Document* aDocument) { if (!aDocument || !AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::referrer, eIgnoreCase)) { return; } nsAutoString content; GetContent(content); Element* headElt = aDocument->GetHeadElement(); if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) { content = nsContentUtils::TrimWhitespace( content); aDocument->SetHeaderData(nsGkAtoms::referrer, content); } } nsresult HTMLMetaElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName, const nsAttrValue* aValue, const nsAttrValue* aOldValue, nsIPrincipal* aSubjectPrincipal, bool aNotify) { if (aNameSpaceID == kNameSpaceID_None) { Document* document = GetUncomposedDoc(); if (aName == nsGkAtoms::content) { if (document && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) { nsAutoString content; GetContent(content); nsContentUtils::ProcessViewportInfo(document, content); } CreateAndDispatchEvent(document, NS_LITERAL_STRING("DOMMetaChanged")); } // Update referrer policy when it got changed from JS SetMetaReferrer(document); } return nsGenericHTMLElement::AfterSetAttr( aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify); } nsresult HTMLMetaElement::BindToTree(Document* aDocument, nsIContent* aParent, nsIContent* aBindingParent) { nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent, aBindingParent); NS_ENSURE_SUCCESS(rv, rv); if (aDocument && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) { nsAutoString content; GetContent(content); nsContentUtils::ProcessViewportInfo(aDocument, content); } if (StaticPrefs::security_csp_enable() && aDocument && !aDocument->IsLoadedAsData() && AttrValueIs(kNameSpaceID_None, nsGkAtoms::httpEquiv, nsGkAtoms::headerCSP, eIgnoreCase)) { // only accept if it // appears in the element. Element* headElt = aDocument->GetHeadElement(); if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) { nsAutoString content; GetContent(content); content = nsContentUtils::TrimWhitespace( content); nsIPrincipal* principal = aDocument->NodePrincipal(); nsCOMPtr csp; principal->EnsureCSP(aDocument, getter_AddRefs(csp)); if (csp) { if (LOG_ENABLED()) { nsAutoCString documentURIspec; nsIURI* documentURI = aDocument->GetDocumentURI(); if (documentURI) { documentURI->GetAsciiSpec(documentURIspec); } LOG( ("HTMLMetaElement %p sets CSP '%s' on document=%p, " "document-uri=%s", this, NS_ConvertUTF16toUTF8(content).get(), aDocument, documentURIspec.get())); } // Multiple CSPs (delivered through either header of meta tag) need to // be joined together, see: // https://w3c.github.io/webappsec/specs/content-security-policy/#delivery-html-meta-element rv = csp->AppendPolicy(content, false, // csp via meta tag can not be report only true); // delivered through the meta tag NS_ENSURE_SUCCESS(rv, rv); aDocument->ApplySettingsFromCSP(false); } } } // Referrer Policy spec requires a element. SetMetaReferrer(aDocument); CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMMetaAdded")); return rv; } void HTMLMetaElement::UnbindFromTree(bool aDeep, bool aNullParent) { nsCOMPtr oldDoc = GetUncomposedDoc(); CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMMetaRemoved")); nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent); } void HTMLMetaElement::CreateAndDispatchEvent(Document* aDoc, const nsAString& aEventName) { if (!aDoc) return; RefPtr asyncDispatcher = new AsyncEventDispatcher( this, aEventName, CanBubble::eYes, ChromeOnlyDispatch::eYes); asyncDispatcher->RunDOMEventWhenSafe(); } JSObject* HTMLMetaElement::WrapNode(JSContext* aCx, JS::Handle aGivenProto) { return HTMLMetaElement_Binding::Wrap(aCx, this, aGivenProto); } } // namespace dom } // namespace mozilla