gecko-dev/dom/browser-element/BrowserElementParent.cpp

/* -*- 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 "BrowserParent.h"

// BrowserParent.h transitively includes <windows.h>, which does
//   #define CreateEvent CreateEventW
// That messes up our call to EventDispatcher::CreateEvent below.

#ifdef CreateEvent
#  undef CreateEvent
#endif

#include "BrowserElementParent.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/HTMLIFrameElement.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsVariant.h"
#include "mozilla/dom/BrowserElementDictionariesBinding.h"
#include "mozilla/dom/CustomEvent.h"

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::layout;

namespace {

using mozilla::BrowserElementParent;
/**
 * Create an <iframe mozbrowser> owned by the same document as
 * aOpenerFrameElement.
 */
already_AddRefed<HTMLIFrameElement> CreateIframe(Element* aOpenerFrameElement,
                                                 const nsAString& aName,
                                                 bool aRemote) {
  nsNodeInfoManager* nodeInfoManager =
      aOpenerFrameElement->OwnerDoc()->NodeInfoManager();

  RefPtr<NodeInfo> nodeInfo = nodeInfoManager->GetNodeInfo(
      nsGkAtoms::iframe,
      /* aPrefix = */ nullptr, kNameSpaceID_XHTML, nsINode::ELEMENT_NODE);

  RefPtr<HTMLIFrameElement> popupFrameElement =
      static_cast<HTMLIFrameElement*>(NS_NewHTMLIFrameElement(
          nodeInfo.forget(), mozilla::dom::NOT_FROM_PARSER));

  popupFrameElement->SetMozbrowser(true);

  // Copy the window name onto the iframe.
  popupFrameElement->SetAttr(kNameSpaceID_None, nsGkAtoms::name, aName,
                             /* aNotify = */ false);

  // Indicate whether the iframe is should be remote.
  popupFrameElement->SetAttr(
      kNameSpaceID_None, nsGkAtoms::remote,
      aRemote ? NS_LITERAL_STRING("true") : NS_LITERAL_STRING("false"),
      /* aNotify = */ false);

  // Copy the opener frame's mozprivatebrowsing attribute to the popup frame.
  nsAutoString mozprivatebrowsing;
  if (aOpenerFrameElement->GetAttr(kNameSpaceID_None,
                                   nsGkAtoms::mozprivatebrowsing,
                                   mozprivatebrowsing)) {
    popupFrameElement->SetAttr(kNameSpaceID_None, nsGkAtoms::mozprivatebrowsing,
                               mozprivatebrowsing, /* aNotify = */ false);
  }

  return popupFrameElement.forget();
}

bool DispatchCustomDOMEvent(Element* aFrameElement, const nsAString& aEventName,
                            JSContext* cx, JS::Handle<JS::Value> aDetailValue,
                            nsEventStatus* aStatus) {
  NS_ENSURE_TRUE(aFrameElement, false);
  RefPtr<nsPresContext> presContext =
      aFrameElement->OwnerDoc()->GetPresContext();

  RefPtr<CustomEvent> event =
      NS_NewDOMCustomEvent(aFrameElement, presContext, nullptr);

  event->InitCustomEvent(cx, aEventName,
                         /* aCanBubble = */ true,
                         /* aCancelable = */ true, aDetailValue);

  event->SetTrusted(true);
  // Dispatch the event.
  // We don't initialize aStatus here, as our callers have already done so.
  nsresult rv = EventDispatcher::DispatchDOMEvent(aFrameElement, nullptr, event,
                                                  presContext, aStatus);
  return NS_SUCCEEDED(rv);
}

}  // namespace

namespace mozilla {

/**
 * Dispatch a mozbrowseropenwindow event to the given opener frame element.
 * The "popup iframe" (event.detail.frameElement) will be |aPopupFrameElement|.
 *
 * Returns true iff there were no unexpected failures and the window.open call
 * was accepted by the embedder.
 */
/*static*/
BrowserElementParent::OpenWindowResult
BrowserElementParent::DispatchOpenWindowEvent(Element* aOpenerFrameElement,
                                              Element* aPopupFrameElement,
                                              const nsAString& aURL,
                                              const nsAString& aName,
                                              bool aForceNoReferrer,
                                              const nsAString& aFeatures) {
  // Dispatch a CustomEvent at aOpenerFrameElement with a detail object
  // (OpenWindowEventDetail) containing aPopupFrameElement, aURL, aName, and
  // aFeatures.

  // Create the event's detail object.
  OpenWindowEventDetail detail;
  if (aURL.IsEmpty()) {
    // URL should never be empty. Assign about:blank as default.
    detail.mUrl = NS_LITERAL_STRING("about:blank");
  } else {
    detail.mUrl = aURL;
  }
  detail.mName = aName;
  detail.mFeatures = aFeatures;
  detail.mFrameElement = aPopupFrameElement;
  detail.mForceNoReferrer = aForceNoReferrer;

  nsIGlobalObject* sgo = aPopupFrameElement->OwnerDoc()->GetScopeObject();
  if (!sgo) {
    return BrowserElementParent::OPEN_WINDOW_IGNORED;
  }

  AutoJSAPI jsapi;
  if (!jsapi.Init(sgo)) {
    return BrowserElementParent::OPEN_WINDOW_IGNORED;
  }

  JSContext* cx = jsapi.cx();
  JS::Rooted<JS::Value> val(cx);

  JS::Rooted<JSObject*> global(cx, sgo->GetGlobalJSObject());
  JSAutoRealm ar(cx, global);
  if (!ToJSValue(cx, detail, &val)) {
    MOZ_CRASH("Failed to convert dictionary to JS::Value due to OOM.");
    return BrowserElementParent::OPEN_WINDOW_IGNORED;
  }

  nsEventStatus status = nsEventStatus_eIgnore;
  bool dispatchSucceeded = DispatchCustomDOMEvent(
      aOpenerFrameElement, NS_LITERAL_STRING("mozbrowseropenwindow"), cx, val,
      &status);

  if (dispatchSucceeded) {
    if (aPopupFrameElement->IsInComposedDoc()) {
      return BrowserElementParent::OPEN_WINDOW_ADDED;
    }
    if (status == nsEventStatus_eConsumeNoDefault) {
      // If the frame was not added to a document, report to callers whether
      // preventDefault was called on or not
      return BrowserElementParent::OPEN_WINDOW_CANCELLED;
    }
  }

  return BrowserElementParent::OPEN_WINDOW_IGNORED;
}

/*static*/
BrowserElementParent::OpenWindowResult BrowserElementParent::OpenWindowOOP(
    BrowserParent* aOpenerBrowserParent, BrowserParent* aPopupBrowserParent,
    const nsAString& aURL, const nsAString& aName, bool aForceNoReferrer,
    const nsAString& aFeatures) {
  // Create an iframe owned by the same document which owns openerFrameElement.
  nsCOMPtr<Element> openerFrameElement =
      aOpenerBrowserParent->GetOwnerElement();
  NS_ENSURE_TRUE(openerFrameElement, BrowserElementParent::OPEN_WINDOW_IGNORED);
  RefPtr<HTMLIFrameElement> popupFrameElement =
      CreateIframe(openerFrameElement, aName, /* aRemote = */ true);

  // Normally an <iframe> element will try to create a frameLoader when the
  // page touches iframe.contentWindow or sets iframe.src.
  //
  // But in our case, we want to delay the creation of the frameLoader until
  // we've verified that the popup has gone through successfully.  If the popup
  // is "blocked" by the embedder, we don't want to load the popup's url.
  //
  // Therefore we call DisallowCreateFrameLoader() on the element and call
  // AllowCreateFrameLoader() only after we've verified that the popup was
  // allowed.
  popupFrameElement->DisallowCreateFrameLoader();

  OpenWindowResult opened =
      DispatchOpenWindowEvent(openerFrameElement, popupFrameElement, aURL,
                              aName, aForceNoReferrer, aFeatures);

  if (opened != BrowserElementParent::OPEN_WINDOW_ADDED) {
    return opened;
  }

  // The popup was not blocked, so hook up the frame element and the popup tab
  // parent, and return success.
  aPopupBrowserParent->SetOwnerElement(popupFrameElement);
  popupFrameElement->AllowCreateFrameLoader();
  popupFrameElement->CreateRemoteFrameLoader(aPopupBrowserParent);

  return opened;
}

/* static */
BrowserElementParent::OpenWindowResult
BrowserElementParent::OpenWindowInProcess(BrowsingContext* aOpenerWindow,
                                          nsIURI* aURI, const nsAString& aName,
                                          const nsACString& aFeatures,
                                          bool aForceNoOpener,
                                          mozIDOMWindowProxy** aReturnWindow) {
  *aReturnWindow = nullptr;

  // If we call window.open from an <iframe> inside an <iframe mozbrowser>,
  // it's as though the top-level document inside the <iframe mozbrowser>
  // called window.open.  (Indeed, in the OOP case, the inner <iframe> lives
  // out-of-process, so we couldn't touch it if we tried.)
  //
  // GetInProcessScriptableTop gets us the <iframe mozbrowser>'s window; we'll
  // use its frame element, rather than aOpenerWindow's frame element, as our
  // "opener frame element" below.
  nsCOMPtr<nsPIDOMWindowOuter> win =
      aOpenerWindow->GetDOMWindow()->GetInProcessScriptableTop();

  nsCOMPtr<Element> openerFrameElement = win->GetFrameElementInternal();
  NS_ENSURE_TRUE(openerFrameElement, BrowserElementParent::OPEN_WINDOW_IGNORED);

  RefPtr<HTMLIFrameElement> popupFrameElement =
      CreateIframe(openerFrameElement, aName, /* aRemote = */ false);
  NS_ENSURE_TRUE(popupFrameElement, BrowserElementParent::OPEN_WINDOW_IGNORED);

  nsAutoCString spec;
  if (aURI) {
    aURI->GetSpec(spec);
  }

  if (!aForceNoOpener) {
    ErrorResult res;
    popupFrameElement->PresetOpenerWindow(WindowProxyHolder(aOpenerWindow),
                                          res);
    MOZ_ASSERT(!res.Failed());
  }

  OpenWindowResult opened = DispatchOpenWindowEvent(
      openerFrameElement, popupFrameElement, NS_ConvertUTF8toUTF16(spec), aName,
      false, NS_ConvertUTF8toUTF16(aFeatures));

  if (opened != BrowserElementParent::OPEN_WINDOW_ADDED) {
    return opened;
  }

  // Return popupFrameElement's window.
  RefPtr<nsFrameLoader> frameLoader = popupFrameElement->GetFrameLoader();
  NS_ENSURE_TRUE(frameLoader, BrowserElementParent::OPEN_WINDOW_IGNORED);

  nsCOMPtr<nsIDocShell> docshell = frameLoader->GetDocShell(IgnoreErrors());
  NS_ENSURE_TRUE(docshell, BrowserElementParent::OPEN_WINDOW_IGNORED);

  nsCOMPtr<nsPIDOMWindowOuter> window = docshell->GetWindow();
  window.forget(aReturnWindow);

  return !!*aReturnWindow ? opened
                          : BrowserElementParent::OPEN_WINDOW_CANCELLED;
}

}  // namespace mozilla