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/* -*- 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
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