/* -*- 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 "nsContentUtils.h" #include "nsStyleConsts.h" #include "nsIContentSecurityPolicy.h" NS_IMPL_NS_NEW_HTML_ELEMENT(Meta) namespace mozilla { namespace dom { HTMLMetaElement::HTMLMetaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo) : nsGenericHTMLElement(aNodeInfo) { } HTMLMetaElement::~HTMLMetaElement() { } NS_IMPL_ISUPPORTS_INHERITED(HTMLMetaElement, nsGenericHTMLElement, nsIDOMHTMLMetaElement) NS_IMPL_ELEMENT_CLONE(HTMLMetaElement) NS_IMPL_STRING_ATTR(HTMLMetaElement, Content, content) NS_IMPL_STRING_ATTR(HTMLMetaElement, HttpEquiv, httpEquiv) NS_IMPL_STRING_ATTR(HTMLMetaElement, Name, name) NS_IMPL_STRING_ATTR(HTMLMetaElement, Scheme, scheme) nsresult HTMLMetaElement::SetMetaReferrer(nsIDocument* aDocument) { if (!aDocument || !AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::referrer, eIgnoreCase)) { return NS_OK; } nsAutoString content; nsresult rv = GetContent(content); if (NS_WARN_IF(NS_FAILED(rv))) { return rv; } Element* headElt = aDocument->GetHeadElement(); if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) { content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content); aDocument->SetHeaderData(nsGkAtoms::referrer, content); } return NS_OK; } nsresult HTMLMetaElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName, const nsAttrValue* aValue, bool aNotify) { if (aNameSpaceID == kNameSpaceID_None) { nsIDocument *document = GetUncomposedDoc(); if (aName == nsGkAtoms::content) { if (document && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) { nsAutoString content; nsresult rv = GetContent(content); NS_ENSURE_SUCCESS(rv, rv); nsContentUtils::ProcessViewportInfo(document, content); } CreateAndDispatchEvent(document, NS_LITERAL_STRING("DOMMetaChanged")); } // Update referrer policy when it got changed from JS nsresult rv = SetMetaReferrer(document); if (NS_WARN_IF(NS_FAILED(rv))) { return rv; } } return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue, aNotify); } nsresult HTMLMetaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent, nsIContent* aBindingParent, bool aCompileEventHandlers) { nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent, aBindingParent, aCompileEventHandlers); NS_ENSURE_SUCCESS(rv, rv); if (aDocument && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) { nsAutoString content; rv = GetContent(content); NS_ENSURE_SUCCESS(rv, rv); nsContentUtils::ProcessViewportInfo(aDocument, content); } if (CSPService::sCSPEnabled && aDocument && 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 = aDocument->GetHeadElement(); if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) { nsAutoString content; rv = GetContent(content); NS_ENSURE_SUCCESS(rv, rv); content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content); nsIPrincipal* principal = aDocument->NodePrincipal(); nsCOMPtr<nsIContentSecurityPolicy> csp; nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aDocument); principal->EnsureCSP(domDoc, getter_AddRefs(csp)); if (csp) { // 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 <meta name="referrer" tag to be in the // <head> element. rv = SetMetaReferrer(aDocument); if (NS_WARN_IF(NS_FAILED(rv))) { return rv; } CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMMetaAdded")); return rv; } void HTMLMetaElement::UnbindFromTree(bool aDeep, bool aNullParent) { nsCOMPtr<nsIDocument> oldDoc = GetUncomposedDoc(); CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMMetaRemoved")); nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent); } void HTMLMetaElement::CreateAndDispatchEvent(nsIDocument* aDoc, const nsAString& aEventName) { if (!aDoc) return; RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(this, aEventName, true, true); asyncDispatcher->RunDOMEventWhenSafe(); } JSObject* HTMLMetaElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) { return HTMLMetaElementBinding::Wrap(aCx, this, aGivenProto); } } // namespace dom } // namespace mozilla