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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/dom/HTMLSharedElement.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/HTMLBaseElementBinding.h"
#include "mozilla/dom/HTMLDirectoryElementBinding.h"
#include "mozilla/dom/HTMLHeadElementBinding.h"
#include "mozilla/dom/HTMLHtmlElementBinding.h"
#include "mozilla/dom/HTMLParamElementBinding.h"
#include "mozilla/dom/HTMLQuoteElementBinding.h"
#include "mozilla/dom/PolicyContainer.h"
#include "nsContentUtils.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIURI.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Shared)
namespace mozilla::dom {
HTMLSharedElement::~HTMLSharedElement() = default;
NS_IMPL_ELEMENT_CLONE(HTMLSharedElement)
void HTMLSharedElement::GetHref(nsAString& aValue) {
MOZ_ASSERT(mNodeInfo->Equals(nsGkAtoms::base),
"This should only get called for <base> elements");
nsAutoString href;
GetAttr(nsGkAtoms::href, href);
nsCOMPtr<nsIURI> uri;
Document* doc = OwnerDoc();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri), href, doc,
doc->GetFallbackBaseURI());
if (!uri) {
aValue = href;
return;
}
nsAutoCString spec;
uri->GetSpec(spec);
CopyUTF8toUTF16(spec, aValue);
}
void HTMLSharedElement::DoneAddingChildren(bool aHaveNotified) {
if (mNodeInfo->Equals(nsGkAtoms::head)) {
if (nsCOMPtr<Document> doc = GetUncomposedDoc()) {
doc->OnL10nResourceContainerParsed();
if (!doc->IsLoadedAsData()) {
RefPtr<AsyncEventDispatcher> asyncDispatcher =
new AsyncEventDispatcher(this, u"DOMHeadElementParsed"_ns,
CanBubble::eYes, ChromeOnlyDispatch::eYes);
// Always run async in order to avoid running script when the content
// sink isn't expecting it.
asyncDispatcher->PostDOMEvent();
}
}
}
}
static void SetBaseURIUsingFirstBaseWithHref(Document* aDocument,
nsIContent* aMustMatch) {
MOZ_ASSERT(aDocument, "Need a document!");
for (nsIContent* child = aDocument->GetFirstChild(); child;
child = child->GetNextNode()) {
if (child->IsHTMLElement(nsGkAtoms::base) &&
child->AsElement()->HasAttr(nsGkAtoms::href)) {
if (aMustMatch && child != aMustMatch) {
return;
}
// Resolve the <base> element's href relative to our document's
// fallback base URI.
nsAutoString href;
child->AsElement()->GetAttr(nsGkAtoms::href, href);
nsCOMPtr<nsIURI> newBaseURI;
nsContentUtils::NewURIWithDocumentCharset(
getter_AddRefs(newBaseURI), href, aDocument,
aDocument->GetFallbackBaseURI());
// Vaguely based on
// <https://html.spec.whatwg.org/multipage/semantics.html#set-the-frozen-base-url>
if (newBaseURI && (newBaseURI->SchemeIs("data") ||
newBaseURI->SchemeIs("javascript"))) {
newBaseURI = nullptr;
}
// Check if CSP allows this base-uri
nsCOMPtr<nsIContentSecurityPolicy> csp =
PolicyContainer::GetCSP(aDocument->GetPolicyContainer());
if (csp && newBaseURI) {
// base-uri is only enforced if explicitly defined in the
// policy - do *not* consult default-src, see:
// http://www.w3.org/TR/CSP2/#directive-default-src
bool cspPermitsBaseURI = true;
nsresult rv = csp->Permits(
child->AsElement(), nullptr /* nsICSPEventListener */, newBaseURI,
nsIContentSecurityPolicy::BASE_URI_DIRECTIVE, true /* aSpecific */,
true /* aSendViolationReports */, &cspPermitsBaseURI);
if (NS_FAILED(rv) || !cspPermitsBaseURI) {
newBaseURI = nullptr;
}
}
aDocument->SetBaseURI(newBaseURI);
aDocument->SetChromeXHRDocBaseURI(nullptr);
return;
}
}
aDocument->SetBaseURI(nullptr);
}
static void SetBaseTargetUsingFirstBaseWithTarget(Document* aDocument,
nsIContent* aMustMatch) {
MOZ_ASSERT(aDocument, "Need a document!");
for (nsIContent* child = aDocument->GetFirstChild(); child;
child = child->GetNextNode()) {
if (child->IsHTMLElement(nsGkAtoms::base) &&
child->AsElement()->HasAttr(nsGkAtoms::target)) {
if (aMustMatch && child != aMustMatch) {
return;
}
nsString target;
child->AsElement()->GetAttr(nsGkAtoms::target, target);
aDocument->SetBaseTarget(target);
return;
}
}
aDocument->SetBaseTarget(u""_ns);
}
void HTMLSharedElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
if (aNamespaceID == kNameSpaceID_None) {
if (aName == nsGkAtoms::href) {
// If the href attribute of a <base> tag is changing, we may need to
// update the document's base URI, which will cause all the links on the
// page to be re-resolved given the new base.
// If the href is being unset (aValue is null), we will need to find a new
// <base>.
if (mNodeInfo->Equals(nsGkAtoms::base) && IsInUncomposedDoc()) {
SetBaseURIUsingFirstBaseWithHref(GetUncomposedDoc(),
aValue ? this : nullptr);
}
} else if (aName == nsGkAtoms::target) {
// The target attribute is in pretty much the same situation as the href
// attribute, above.
if (mNodeInfo->Equals(nsGkAtoms::base) && IsInUncomposedDoc()) {
SetBaseTargetUsingFirstBaseWithTarget(GetUncomposedDoc(),
aValue ? this : nullptr);
}
}
}
return nsGenericHTMLElement::AfterSetAttr(
aNamespaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}
nsresult HTMLSharedElement::BindToTree(BindContext& aContext,
nsINode& aParent) {
nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
NS_ENSURE_SUCCESS(rv, rv);
// The document stores a pointer to its base URI and base target, which we may
// need to update here.
if (mNodeInfo->Equals(nsGkAtoms::base) && IsInUncomposedDoc()) {
if (HasAttr(nsGkAtoms::href)) {
SetBaseURIUsingFirstBaseWithHref(&aContext.OwnerDoc(), this);
}
if (HasAttr(nsGkAtoms::target)) {
SetBaseTargetUsingFirstBaseWithTarget(&aContext.OwnerDoc(), this);
}
}
return NS_OK;
}
void HTMLSharedElement::UnbindFromTree(UnbindContext& aContext) {
Document* doc = GetUncomposedDoc();
nsGenericHTMLElement::UnbindFromTree(aContext);
// If we're removing a <base> from a document, we may need to update the
// document's base URI and base target
if (doc && mNodeInfo->Equals(nsGkAtoms::base)) {
if (HasAttr(nsGkAtoms::href)) {
SetBaseURIUsingFirstBaseWithHref(doc, nullptr);
}
if (HasAttr(nsGkAtoms::target)) {
SetBaseTargetUsingFirstBaseWithTarget(doc, nullptr);
}
}
}
JSObject* HTMLSharedElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
if (mNodeInfo->Equals(nsGkAtoms::param)) {
return HTMLParamElement_Binding::Wrap(aCx, this, aGivenProto);
}
if (mNodeInfo->Equals(nsGkAtoms::base)) {
return HTMLBaseElement_Binding::Wrap(aCx, this, aGivenProto);
}
if (mNodeInfo->Equals(nsGkAtoms::dir)) {
return HTMLDirectoryElement_Binding::Wrap(aCx, this, aGivenProto);
}
if (mNodeInfo->Equals(nsGkAtoms::q) ||
mNodeInfo->Equals(nsGkAtoms::blockquote)) {
return HTMLQuoteElement_Binding::Wrap(aCx, this, aGivenProto);
}
if (mNodeInfo->Equals(nsGkAtoms::head)) {
return HTMLHeadElement_Binding::Wrap(aCx, this, aGivenProto);
}
MOZ_ASSERT(mNodeInfo->Equals(nsGkAtoms::html));
return HTMLHtmlElement_Binding::Wrap(aCx, this, aGivenProto);
}
} // namespace mozilla::dom
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