Quelle HTMLSharedElement.cpp Sprache: C

/* -*- 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/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/AsyncEventDispatcher.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 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 = aDocument->GetCsp();
      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

quality95%

¤ Dauer der Verarbeitung: 0.20 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.