/* -*- 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/. */

//#define USEWEAKREFS // (haven't quite figured that out yet)

#include "nsWindowWatcher.h"
#include "nsAutoWindowStateHelper.h"

#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsIAuthPrompt.h"
#include "nsIAuthPrompt2.h"
#include "nsISimpleEnumerator.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsJSUtils.h"
#include "plstr.h"

#include "nsDocShell.h"
#include "nsGlobalWindow.h"
#include "nsIBaseWindow.h"
#include "nsIBrowserDOMWindow.h"
#include "nsIDocShell.h"
#include "nsIDocShellLoadInfo.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIDocumentLoader.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMWindow.h"
#include "nsIDOMChromeWindow.h"
#include "nsIDOMModalContentWindow.h"
#include "nsIPrompt.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsIScriptContext.h"
#include "nsIObserverService.h"
#include "nsIScriptSecurityManager.h"
#include "nsXPCOM.h"
#include "nsIURI.h"
#include "nsIWebBrowser.h"
#include "nsIWebBrowserChrome.h"
#include "nsIWebNavigation.h"
#include "nsIWindowCreator.h"
#include "nsIWindowCreator2.h"
#include "nsIXPConnect.h"
#include "nsIXULRuntime.h"
#include "nsPIDOMWindow.h"
#include "nsIContentViewer.h"
#include "nsIWindowProvider.h"
#include "nsIMutableArray.h"
#include "nsIDOMStorageManager.h"
#include "nsIWidget.h"
#include "nsFocusManager.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsContentUtils.h"
#include "nsIPrefBranch.h"
#include "nsIPrefService.h"
#include "nsSandboxFlags.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/DOMStorage.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/TabGroup.h"
#include "nsIXULWindow.h"
#include "nsIXULBrowserWindow.h"
#include "nsGlobalWindow.h"

#ifdef USEWEAKREFS
#include "nsIWeakReference.h"
#endif

using namespace mozilla;
using namespace mozilla::dom;

/****************************************************************
 ******************** nsWatcherWindowEntry **********************
 ****************************************************************/

class nsWindowWatcher;

struct nsWatcherWindowEntry
{

  nsWatcherWindowEntry(mozIDOMWindowProxy* aWindow, nsIWebBrowserChrome* aChrome)
    : mChrome(nullptr)
  {
#ifdef USEWEAKREFS
    mWindow = do_GetWeakReference(aWindow);
#else
    mWindow = aWindow;
#endif
    nsCOMPtr<nsISupportsWeakReference> supportsweak(do_QueryInterface(aChrome));
    if (supportsweak) {
      supportsweak->GetWeakReference(getter_AddRefs(mChromeWeak));
    } else {
      mChrome = aChrome;
      mChromeWeak = nullptr;
    }
    ReferenceSelf();
  }
  ~nsWatcherWindowEntry() {}

  void InsertAfter(nsWatcherWindowEntry* aOlder);
  void Unlink();
  void ReferenceSelf();

#ifdef USEWEAKREFS
  nsCOMPtr<nsIWeakReference> mWindow;
#else // still not an owning ref
  mozIDOMWindowProxy* mWindow;
#endif
  nsIWebBrowserChrome* mChrome;
  nsWeakPtr mChromeWeak;
  // each struct is in a circular, doubly-linked list
  nsWatcherWindowEntry* mYounger; // next younger in sequence
  nsWatcherWindowEntry* mOlder;
};

void
nsWatcherWindowEntry::InsertAfter(nsWatcherWindowEntry* aOlder)
{
  if (aOlder) {
    mOlder = aOlder;
    mYounger = aOlder->mYounger;
    mOlder->mYounger = this;
    if (mOlder->mOlder == mOlder) {
      mOlder->mOlder = this;
    }
    mYounger->mOlder = this;
    if (mYounger->mYounger == mYounger) {
      mYounger->mYounger = this;
    }
  }
}

void
nsWatcherWindowEntry::Unlink()
{
  mOlder->mYounger = mYounger;
  mYounger->mOlder = mOlder;
  ReferenceSelf();
}

void
nsWatcherWindowEntry::ReferenceSelf()
{

  mYounger = this;
  mOlder = this;
}

/****************************************************************
 ****************** nsWatcherWindowEnumerator *******************
 ****************************************************************/

class nsWatcherWindowEnumerator : public nsISimpleEnumerator
{

public:
  explicit nsWatcherWindowEnumerator(nsWindowWatcher* aWatcher);
  NS_IMETHOD HasMoreElements(bool* aResult) override;
  NS_IMETHOD GetNext(nsISupports** aResult) override;

  NS_DECL_ISUPPORTS

protected:
  virtual ~nsWatcherWindowEnumerator();

private:
  friend class nsWindowWatcher;

  nsWatcherWindowEntry* FindNext();
  void WindowRemoved(nsWatcherWindowEntry* aInfo);

  nsWindowWatcher* mWindowWatcher;
  nsWatcherWindowEntry* mCurrentPosition;
};

NS_IMPL_ADDREF(nsWatcherWindowEnumerator)
NS_IMPL_RELEASE(nsWatcherWindowEnumerator)
NS_IMPL_QUERY_INTERFACE(nsWatcherWindowEnumerator, nsISimpleEnumerator)

nsWatcherWindowEnumerator::nsWatcherWindowEnumerator(nsWindowWatcher* aWatcher)
  : mWindowWatcher(aWatcher)
  , mCurrentPosition(aWatcher->mOldestWindow)
{
  mWindowWatcher->AddEnumerator(this);
  mWindowWatcher->AddRef();
}

nsWatcherWindowEnumerator::~nsWatcherWindowEnumerator()
{
  mWindowWatcher->RemoveEnumerator(this);
  mWindowWatcher->Release();
}

NS_IMETHODIMP
nsWatcherWindowEnumerator::HasMoreElements(bool* aResult)
{
  if (!aResult) {
    return NS_ERROR_INVALID_ARG;
  }

  *aResult = !!mCurrentPosition;
  return NS_OK;
}

NS_IMETHODIMP
nsWatcherWindowEnumerator::GetNext(nsISupports** aResult)
{
  if (!aResult) {
    return NS_ERROR_INVALID_ARG;
  }

  *aResult = nullptr;

#ifdef USEWEAKREFS
  while (mCurrentPosition) {
    CallQueryReferent(mCurrentPosition->mWindow, aResult);
    if (*aResult) {
      mCurrentPosition = FindNext();
      break;
    } else { // window is gone!
      mWindowWatcher->RemoveWindow(mCurrentPosition);
    }
  }
  NS_IF_ADDREF(*aResult);
#else
  if (mCurrentPosition) {
    CallQueryInterface(mCurrentPosition->mWindow, aResult);
    mCurrentPosition = FindNext();
  }
#endif
  return NS_OK;
}

nsWatcherWindowEntry*
nsWatcherWindowEnumerator::FindNext()
{
  nsWatcherWindowEntry* info;

  if (!mCurrentPosition) {
    return 0;
  }

  info = mCurrentPosition->mYounger;
  return info == mWindowWatcher->mOldestWindow ? 0 : info;
}

// if a window is being removed adjust the iterator's current position
void
nsWatcherWindowEnumerator::WindowRemoved(nsWatcherWindowEntry* aInfo)
{

  if (mCurrentPosition == aInfo) {
    mCurrentPosition =
      mCurrentPosition != aInfo->mYounger ? aInfo->mYounger : 0;
  }
}

/****************************************************************
 *********************** nsWindowWatcher ************************
 ****************************************************************/

NS_IMPL_ADDREF(nsWindowWatcher)
NS_IMPL_RELEASE(nsWindowWatcher)
NS_IMPL_QUERY_INTERFACE(nsWindowWatcher,
                        nsIWindowWatcher,
                        nsIPromptFactory,
                        nsPIWindowWatcher)

nsWindowWatcher::nsWindowWatcher()
  : mEnumeratorList()
  , mOldestWindow(0)
  , mListLock("nsWindowWatcher.mListLock")
{
}

nsWindowWatcher::~nsWindowWatcher()
{
  // delete data
  while (mOldestWindow) {
    RemoveWindow(mOldestWindow);
  }
}

nsresult
nsWindowWatcher::Init()
{
  return NS_OK;
}

/**
 * Convert aArguments into either an nsIArray or nullptr.
 *
 *  - If aArguments is nullptr, return nullptr.
 *  - If aArguments is an nsArray, return nullptr if it's empty, or otherwise
 *    return the array.
 *  - If aArguments is an nsIArray, return nullptr if it's empty, or
 *    otherwise just return the array.
 *  - Otherwise, return an nsIArray with one element: aArguments.
 */
static already_AddRefed<nsIArray>
ConvertArgsToArray(nsISupports* aArguments)
{
  if (!aArguments) {
    return nullptr;
  }

  nsCOMPtr<nsIArray> array = do_QueryInterface(aArguments);
  if (array) {
    uint32_t argc = 0;
    array->GetLength(&argc);
    if (argc == 0) {
      return nullptr;
    }

    return array.forget();
  }

  nsCOMPtr<nsIMutableArray> singletonArray =
    do_CreateInstance(NS_ARRAY_CONTRACTID);
  NS_ENSURE_TRUE(singletonArray, nullptr);

  nsresult rv = singletonArray->AppendElement(aArguments, /* aWeak = */ false);
  NS_ENSURE_SUCCESS(rv, nullptr);

  return singletonArray.forget();
}

NS_IMETHODIMP
nsWindowWatcher::OpenWindow(mozIDOMWindowProxy* aParent,
                            const char* aUrl,
                            const char* aName,
                            const char* aFeatures,
                            nsISupports* aArguments,
                            mozIDOMWindowProxy** aResult)
{
  nsCOMPtr<nsIArray> argv = ConvertArgsToArray(aArguments);

  uint32_t argc = 0;
  if (argv) {
    argv->GetLength(&argc);
  }
  bool dialog = (argc != 0);

  return OpenWindowInternal(aParent, aUrl, aName, aFeatures,
                            /* calledFromJS = */ false, dialog,
                            /* navigate = */ true, argv,
                            /* aIsPopupSpam = */ false,
                            /* aForceNoOpener = */ false,
                            /* aLoadInfo = */ nullptr,
                            aResult);
}

struct SizeSpec
{
  SizeSpec()
    : mLeft(0)
    , mTop(0)
    , mOuterWidth(0)
    , mOuterHeight(0)
    , mInnerWidth(0)
    , mInnerHeight(0)
    , mLeftSpecified(false)
    , mTopSpecified(false)
    , mOuterWidthSpecified(false)
    , mOuterHeightSpecified(false)
    , mInnerWidthSpecified(false)
    , mInnerHeightSpecified(false)
    , mUseDefaultWidth(false)
    , mUseDefaultHeight(false)
  {
  }

  int32_t mLeft;
  int32_t mTop;
  int32_t mOuterWidth;  // Total window width
  int32_t mOuterHeight; // Total window height
  int32_t mInnerWidth;  // Content area width
  int32_t mInnerHeight; // Content area height

  bool mLeftSpecified;
  bool mTopSpecified;
  bool mOuterWidthSpecified;
  bool mOuterHeightSpecified;
  bool mInnerWidthSpecified;
  bool mInnerHeightSpecified;

  // If these booleans are true, don't look at the corresponding width values
  // even if they're specified -- they'll be bogus
  bool mUseDefaultWidth;
  bool mUseDefaultHeight;

  bool PositionSpecified() const
  {
    return mLeftSpecified || mTopSpecified;
  }

  bool SizeSpecified() const
  {
    return mOuterWidthSpecified || mOuterHeightSpecified ||
           mInnerWidthSpecified || mInnerHeightSpecified;
  }
};

NS_IMETHODIMP
nsWindowWatcher::OpenWindow2(mozIDOMWindowProxy* aParent,
                             const char* aUrl,
                             const char* aName,
                             const char* aFeatures,
                             bool aCalledFromScript,
                             bool aDialog,
                             bool aNavigate,
                             nsISupports* aArguments,
                             bool aIsPopupSpam,
                             bool aForceNoOpener,
                             nsIDocShellLoadInfo* aLoadInfo,
                             mozIDOMWindowProxy** aResult)
{
  nsCOMPtr<nsIArray> argv = ConvertArgsToArray(aArguments);

  uint32_t argc = 0;
  if (argv) {
    argv->GetLength(&argc);
  }

  // This is extremely messed up, but this behavior is necessary because
  // callers lie about whether they're a dialog window and whether they're
  // called from script.  Fixing this is bug 779939.
  bool dialog = aDialog;
  if (!aCalledFromScript) {
    dialog = argc > 0;
  }

  return OpenWindowInternal(aParent, aUrl, aName, aFeatures,
                            aCalledFromScript, dialog,
                            aNavigate, argv, aIsPopupSpam,
                            aForceNoOpener, aLoadInfo, aResult);
}

// This static function checks if the aDocShell uses an UserContextId equal to
// the userContextId of subjectPrincipal, if not null.
static bool
CheckUserContextCompatibility(nsIDocShell* aDocShell)
{
  MOZ_ASSERT(aDocShell);

  uint32_t userContextId =
    static_cast<nsDocShell*>(aDocShell)->GetOriginAttributes().mUserContextId;

  nsCOMPtr<nsIPrincipal> subjectPrincipal =
    nsContentUtils::GetCurrentJSContext()
      ? nsContentUtils::SubjectPrincipal() : nullptr;

  // If we don't have a valid principal, probably we are in e10s mode, parent
  // side.
  if (!subjectPrincipal) {
    return true;
  }

  // DocShell can have UsercontextID set but loading a document with system
  // principal. In this case, we consider everything ok.
  if (nsContentUtils::IsSystemPrincipal(subjectPrincipal)) {
    return true;
  }

  return subjectPrincipal->GetUserContextId() == userContextId;
}

NS_IMETHODIMP
nsWindowWatcher::OpenWindowWithoutParent(nsITabParent** aResult)
{
  return OpenWindowWithTabParent(nullptr, EmptyCString(), true, 1.0f, aResult);
}

nsresult
nsWindowWatcher::CreateChromeWindow(const nsACString& aFeatures,
                                    nsIWebBrowserChrome* aParentChrome,
                                    uint32_t aChromeFlags,
                                    uint32_t aContextFlags,
                                    nsITabParent* aOpeningTabParent,
                                    mozIDOMWindowProxy* aOpener,
                                    nsIWebBrowserChrome** aResult)
{
  nsCOMPtr<nsIWindowCreator2> windowCreator2(do_QueryInterface(mWindowCreator));
  if (NS_WARN_IF(!windowCreator2)) {
    return NS_ERROR_UNEXPECTED;
  }

  bool cancel = false;
  nsCOMPtr<nsIWebBrowserChrome> newWindowChrome;
  nsresult rv =
    windowCreator2->CreateChromeWindow2(aParentChrome, aChromeFlags, aContextFlags,
                                        aOpeningTabParent, aOpener, &cancel,
                                        getter_AddRefs(newWindowChrome));

  if (NS_SUCCEEDED(rv) && cancel) {
    newWindowChrome = nullptr;
    return NS_ERROR_ABORT;
  }

  newWindowChrome.forget(aResult);
  return NS_OK;
}

/**
 * Disable persistence of size/position in popups (determined by
 * determining whether the features parameter specifies width or height
 * in any way). We consider any overriding of the window's size or position
 * in the open call as disabling persistence of those attributes.
 * Popup windows (which should not persist size or position) generally set
 * the size.
 *
 * @param aFeatures
 *        The features string that was used to open the window.
 * @param aTreeOwner
 *        The nsIDocShellTreeOwner of the newly opened window. If null,
 *        this function is a no-op.
 */
void
nsWindowWatcher::MaybeDisablePersistence(const nsACString& aFeatures,
                                         nsIDocShellTreeOwner* aTreeOwner)
{
  if (!aTreeOwner) {
    return;
  }

 // At the moment, the strings "height=" or "width=" never happen
 // outside a size specification, so we can do this the Q&D way.
  if (PL_strcasestr(aFeatures.BeginReading(), "width=") ||
      PL_strcasestr(aFeatures.BeginReading(), "height=")) {
    aTreeOwner->SetPersistence(false, false, false);
  }
}

NS_IMETHODIMP
nsWindowWatcher::OpenWindowWithTabParent(nsITabParent* aOpeningTabParent,
                                         const nsACString& aFeatures,
                                         bool aCalledFromJS,
                                         float aOpenerFullZoom,
                                         nsITabParent** aResult)
{
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(mWindowCreator);

  if (!nsContentUtils::IsSafeToRunScript()) {
    nsContentUtils::WarnScriptWasIgnored(nullptr);
    return NS_ERROR_FAILURE;
  }

  if (NS_WARN_IF(!mWindowCreator)) {
    return NS_ERROR_UNEXPECTED;
  }

  bool isPrivateBrowsingWindow =
    Preferences::GetBool("browser.privatebrowsing.autostart");

  nsCOMPtr<nsPIDOMWindowOuter> parentWindowOuter;
  if (aOpeningTabParent) {
    // We need to examine the window that aOpeningTabParent belongs to in
    // order to inform us of what kind of window we're going to open.
    TabParent* openingTab = TabParent::GetFrom(aOpeningTabParent);
    parentWindowOuter = openingTab->GetParentWindowOuter();

    // Propagate the privacy status of the parent window, if
    // available, to the child.
    if (!isPrivateBrowsingWindow) {
      nsCOMPtr<nsILoadContext> parentContext = openingTab->GetLoadContext();
      if (parentContext) {
        isPrivateBrowsingWindow = parentContext->UsePrivateBrowsing();
      }
    }
  }

  if (!parentWindowOuter) {
    // We couldn't find a browser window for the opener, so either we
    // never were passed aOpeningTabParent, the window is closed,
    // or it's in the process of closing. Either way, we'll use
    // the most recently opened browser window instead.
    parentWindowOuter = nsContentUtils::GetMostRecentNonPBWindow();
  }

  if (NS_WARN_IF(!parentWindowOuter)) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsIDocShellTreeOwner> parentTreeOwner;
  GetWindowTreeOwner(parentWindowOuter, getter_AddRefs(parentTreeOwner));
  if (NS_WARN_IF(!parentTreeOwner)) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsIWindowCreator2> windowCreator2(do_QueryInterface(mWindowCreator));
  if (NS_WARN_IF(!windowCreator2)) {
    return NS_ERROR_UNEXPECTED;
  }

  uint32_t contextFlags = 0;
  if (parentWindowOuter->IsLoadingOrRunningTimeout()) {
    contextFlags |=
            nsIWindowCreator2::PARENT_IS_LOADING_OR_RUNNING_TIMEOUT;
  }

  uint32_t chromeFlags = CalculateChromeFlagsForChild(aFeatures);

  // A content process has asked for a new window, which implies
  // that the new window will need to be remote.
  chromeFlags |= nsIWebBrowserChrome::CHROME_REMOTE_WINDOW;

  nsCOMPtr<nsIWebBrowserChrome> parentChrome(do_GetInterface(parentTreeOwner));
  nsCOMPtr<nsIWebBrowserChrome> newWindowChrome;

  CreateChromeWindow(aFeatures, parentChrome, chromeFlags, contextFlags,
                     aOpeningTabParent, nullptr, getter_AddRefs(newWindowChrome));

  if (NS_WARN_IF(!newWindowChrome)) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsIDocShellTreeItem> chromeTreeItem = do_GetInterface(newWindowChrome);
  if (NS_WARN_IF(!chromeTreeItem)) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsIDocShellTreeOwner> chromeTreeOwner;
  chromeTreeItem->GetTreeOwner(getter_AddRefs(chromeTreeOwner));
  if (NS_WARN_IF(!chromeTreeOwner)) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsILoadContext> chromeContext = do_QueryInterface(chromeTreeItem);
  if (NS_WARN_IF(!chromeContext)) {
    return NS_ERROR_UNEXPECTED;
  }

  chromeContext->SetPrivateBrowsing(isPrivateBrowsingWindow);

  // Tabs opened from a content process can only open new windows
  // that will also run with out-of-process tabs.
  chromeContext->SetRemoteTabs(true);

  MaybeDisablePersistence(aFeatures, chromeTreeOwner);

  SizeSpec sizeSpec;
  CalcSizeSpec(aFeatures, sizeSpec);
  SizeOpenedWindow(chromeTreeOwner, parentWindowOuter, false, sizeSpec,
                   Some(aOpenerFullZoom));

  nsCOMPtr<nsITabParent> newTabParent;
  chromeTreeOwner->GetPrimaryTabParent(getter_AddRefs(newTabParent));
  if (NS_WARN_IF(!newTabParent)) {
    return NS_ERROR_UNEXPECTED;
  }

  newTabParent.forget(aResult);
  return NS_OK;
}

nsresult
nsWindowWatcher::OpenWindowInternal(mozIDOMWindowProxy* aParent,
                                    const char* aUrl,
                                    const char* aName,
                                    const char* aFeatures,
                                    bool aCalledFromJS,
                                    bool aDialog,
                                    bool aNavigate,
                                    nsIArray* aArgv,
                                    bool aIsPopupSpam,
                                    bool aForceNoOpener,
                                    nsIDocShellLoadInfo* aLoadInfo,
                                    mozIDOMWindowProxy** aResult)
{
  nsresult rv = NS_OK;
  bool isNewToplevelWindow = false;
  bool windowIsNew = false;
  bool windowNeedsName = false;
  bool windowIsModal = false;
  bool uriToLoadIsChrome = false;

  uint32_t chromeFlags;
  nsAutoString name;          // string version of aName
  nsAutoCString features;     // string version of aFeatures
  nsCOMPtr<nsIURI> uriToLoad; // from aUrl, if any
  nsCOMPtr<nsIDocShellTreeOwner> parentTreeOwner; // from the parent window, if any
  nsCOMPtr<nsIDocShellTreeItem> newDocShellItem; // from the new window

  nsCOMPtr<nsPIDOMWindowOuter> parent =
    aParent ? nsPIDOMWindowOuter::From(aParent) : nullptr;

  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = 0;

  if (!nsContentUtils::IsSafeToRunScript()) {
    nsContentUtils::WarnScriptWasIgnored(nullptr);
    return NS_ERROR_FAILURE;
  }

  GetWindowTreeOwner(parent, getter_AddRefs(parentTreeOwner));

  // We expect TabParent to have provided us the absolute URI of the window
  // we're to open, so there's no need to call URIfromURL (or more importantly,
  // to check for a chrome URI, which cannot be opened from a remote tab).
  if (aUrl) {
    rv = URIfromURL(aUrl, aParent, getter_AddRefs(uriToLoad));
    if (NS_FAILED(rv)) {
      return rv;
    }
    uriToLoad->SchemeIs("chrome", &uriToLoadIsChrome);
  }

  bool nameSpecified = false;
  if (aName) {
    CopyUTF8toUTF16(aName, name);
    nameSpecified = true;
  } else {
    name.SetIsVoid(true);
  }

  if (aFeatures) {
    features.Assign(aFeatures);
    features.StripWhitespace();
  } else {
    features.SetIsVoid(true);
  }

  // try to find an extant window with the given name
  nsCOMPtr<nsPIDOMWindowOuter> foundWindow =
    SafeGetWindowByName(name, aForceNoOpener, aParent);
  GetWindowTreeItem(foundWindow, getter_AddRefs(newDocShellItem));

  // Do sandbox checks here, instead of waiting until nsIDocShell::LoadURI.
  // The state of the window can change before this call and if we are blocked
  // because of sandboxing, we wouldn't want that to happen.
  nsCOMPtr<nsPIDOMWindowOuter> parentWindow =
    aParent ? nsPIDOMWindowOuter::From(aParent) : nullptr;
  nsCOMPtr<nsIDocShell> parentDocShell;
  if (parentWindow) {
    parentDocShell = parentWindow->GetDocShell();
    if (parentDocShell) {
      nsCOMPtr<nsIDocShell> foundDocShell = do_QueryInterface(newDocShellItem);
      if (parentDocShell->IsSandboxedFrom(foundDocShell)) {
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      }
    }
  }

  // no extant window? make a new one.

  // If no parent, consider it chrome when running in the parent process.
  bool hasChromeParent = XRE_IsContentProcess() ? false : true;
  if (aParent) {
    // Check if the parent document has chrome privileges.
    nsIDocument* doc = parentWindow->GetDoc();
    hasChromeParent = doc && nsContentUtils::IsChromeDoc(doc);
  }

  bool isCallerChrome = nsContentUtils::LegacyIsCallerChromeOrNativeCode();

  // Make sure we calculate the chromeFlags *before* we push the
  // callee context onto the context stack so that
  // the calculation sees the actual caller when doing its
  // security checks.
  if (isCallerChrome && XRE_IsParentProcess()) {
    chromeFlags = CalculateChromeFlagsForParent(aParent, features,
                                                aDialog, uriToLoadIsChrome,
                                                hasChromeParent, aCalledFromJS);
  } else {
    chromeFlags = CalculateChromeFlagsForChild(features);

    if (aDialog) {
      MOZ_ASSERT(XRE_IsParentProcess());
      chromeFlags |= nsIWebBrowserChrome::CHROME_OPENAS_DIALOG;
    }
  }

  SizeSpec sizeSpec;
  CalcSizeSpec(features, sizeSpec);

  nsCOMPtr<nsIScriptSecurityManager> sm(
    do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID));


  // XXXbz Why is an AutoJSAPI good enough here?  Wouldn't AutoEntryScript (so
  // we affect the entry global) make more sense?  Or do we just want to affect
  // GetSubjectPrincipal()?
  dom::AutoJSAPI jsapiChromeGuard;

  bool windowTypeIsChrome =
    chromeFlags & nsIWebBrowserChrome::CHROME_OPENAS_CHROME;
  if (isCallerChrome && !hasChromeParent && !windowTypeIsChrome) {
    // open() is called from chrome on a non-chrome window, initialize an
    // AutoJSAPI with the callee to prevent the caller's privileges from leaking
    // into code that runs while opening the new window.
    //
    // The reasoning for this is in bug 289204. Basically, chrome sometimes does
    // someContentWindow.open(untrustedURL), and wants to be insulated from nasty
    // javascript: URLs and such. But there are also cases where we create a
    // window parented to a content window (such as a download dialog), usually
    // directly with nsIWindowWatcher. In those cases, we want the principal of
    // the initial about:blank document to be system, so that the subsequent XUL
    // load can reuse the inner window and avoid blowing away expandos. As such,
    // we decide whether to load with the principal of the caller or of the parent
    // based on whether the docshell type is chrome or content.

    nsCOMPtr<nsIGlobalObject> parentGlobalObject = do_QueryInterface(aParent);
    if (!aParent) {
      jsapiChromeGuard.Init();
    } else if (NS_WARN_IF(!jsapiChromeGuard.Init(parentGlobalObject))) {
      return NS_ERROR_UNEXPECTED;
    }
  }

  uint32_t activeDocsSandboxFlags = 0;
  if (!newDocShellItem) {
    // We're going to either open up a new window ourselves or ask a
    // nsIWindowProvider for one.  In either case, we'll want to set the right
    // name on it.
    windowNeedsName = true;

    // If the parent trying to open a new window is sandboxed
    // without 'allow-popups', this is not allowed and we fail here.
    if (aParent) {
      if (nsIDocument* doc = parentWindow->GetDoc()) {
        // Save sandbox flags for copying to new browsing context (docShell).
        activeDocsSandboxFlags = doc->GetSandboxFlags();
        if (activeDocsSandboxFlags & SANDBOXED_AUXILIARY_NAVIGATION) {
          return NS_ERROR_DOM_INVALID_ACCESS_ERR;
        }
      }
    }

    // Now check whether it's ok to ask a window provider for a window.  Don't
    // do it if we're opening a dialog or if our parent is a chrome window or
    // if we're opening something that has modal, dialog, or chrome flags set.
    nsCOMPtr<nsIDOMChromeWindow> chromeWin = do_QueryInterface(aParent);
    if (!aDialog && !chromeWin &&
        !(chromeFlags & (nsIWebBrowserChrome::CHROME_MODAL |
                         nsIWebBrowserChrome::CHROME_OPENAS_DIALOG |
                         nsIWebBrowserChrome::CHROME_OPENAS_CHROME))) {
      nsCOMPtr<nsIWindowProvider> provider;
      if (parentTreeOwner) {
        provider = do_GetInterface(parentTreeOwner);
      } else if (XRE_IsContentProcess()) {
        // we're in a content process but we don't have a tabchild we can
        // use.
        provider = nsContentUtils::GetWindowProviderForContentProcess();
      }

      if (provider) {
        nsCOMPtr<mozIDOMWindowProxy> newWindow;
        rv = provider->ProvideWindow(aParent, chromeFlags, aCalledFromJS,
                                     sizeSpec.PositionSpecified(),
                                     sizeSpec.SizeSpecified(),
                                     uriToLoad, name, features, aForceNoOpener,
                                     &windowIsNew, getter_AddRefs(newWindow));

        if (NS_SUCCEEDED(rv)) {
          GetWindowTreeItem(newWindow, getter_AddRefs(newDocShellItem));
          if (windowIsNew && newDocShellItem) {
            // Make sure to stop any loads happening in this window that the
            // window provider might have started.  Otherwise if our caller
            // manipulates the window it just opened and then the load
            // completes their stuff will get blown away.
            nsCOMPtr<nsIWebNavigation> webNav =
              do_QueryInterface(newDocShellItem);
            webNav->Stop(nsIWebNavigation::STOP_NETWORK);
          }

          // If this is a new window, but it's incompatible with the current
          // userContextId, we ignore it and we pretend that nothing has been
          // returned by ProvideWindow.
          if (!windowIsNew && newDocShellItem) {
            nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(newDocShellItem);
            if (!CheckUserContextCompatibility(docShell)) {
              newWindow = nullptr;
              newDocShellItem = nullptr;
              windowIsNew = false;
            }
          }

        } else if (rv == NS_ERROR_ABORT) {
          // NS_ERROR_ABORT means the window provider has flat-out rejected
          // the open-window call and we should bail.  Don't return an error
          // here, because our caller may propagate that error, which might
          // cause e.g. window.open to throw!  Just return null for our out
          // param.
          return NS_OK;
        }
      }
    }
  }

  bool newWindowShouldBeModal = false;
  bool parentIsModal = false;
  if (!newDocShellItem) {
    windowIsNew = true;
    isNewToplevelWindow = true;

    nsCOMPtr<nsIWebBrowserChrome> parentChrome(do_GetInterface(parentTreeOwner));

    // is the parent (if any) modal? if so, we must be, too.
    bool weAreModal = (chromeFlags & nsIWebBrowserChrome::CHROME_MODAL) != 0;
    newWindowShouldBeModal = weAreModal;
    if (!weAreModal && parentChrome) {
      parentChrome->IsWindowModal(&weAreModal);
      parentIsModal = weAreModal;
    }

    if (weAreModal) {
      windowIsModal = true;
      // in case we added this because weAreModal
      chromeFlags |= nsIWebBrowserChrome::CHROME_MODAL |
                     nsIWebBrowserChrome::CHROME_DEPENDENT;
    }

    // Make sure to not create modal windows if our parent is invisible and
    // isn't a chrome window.  Otherwise we can end up in a bizarre situation
    // where we can't shut down because an invisible window is open.  If
    // someone tries to do this, throw.
    if (!hasChromeParent && (chromeFlags & nsIWebBrowserChrome::CHROME_MODAL)) {
      nsCOMPtr<nsIBaseWindow> parentWindow(do_GetInterface(parentTreeOwner));
      nsCOMPtr<nsIWidget> parentWidget;
      if (parentWindow) {
        parentWindow->GetMainWidget(getter_AddRefs(parentWidget));
      }
      // NOTE: the logic for this visibility check is duplicated in
      // nsIDOMWindowUtils::isParentWindowMainWidgetVisible - if we change
      // how a window is determined "visible" in this context then we should
      // also adjust that attribute and/or any consumers of it...
      if (parentWidget && !parentWidget->IsVisible()) {
        return NS_ERROR_NOT_AVAILABLE;
      }
    }

    NS_ASSERTION(mWindowCreator,
                 "attempted to open a new window with no WindowCreator");
    rv = NS_ERROR_FAILURE;
    if (mWindowCreator) {
      nsCOMPtr<nsIWebBrowserChrome> newChrome;

      nsCOMPtr<nsPIDOMWindowInner> parentTopInnerWindow;
      if (parentWindow) {
        nsCOMPtr<nsPIDOMWindowOuter> parentTopWindow = parentWindow->GetTop();
        if (parentTopWindow) {
          parentTopInnerWindow = parentTopWindow->GetCurrentInnerWindow();
        }
      }

      if (parentTopInnerWindow) {
        parentTopInnerWindow->Suspend();
      }

      /* If the window creator is an nsIWindowCreator2, we can give it
         some hints. The only hint at this time is whether the opening window
         is in a situation that's likely to mean this is an unrequested
         popup window we're creating. However we're not completely honest:
         we clear that indicator if the opener is chrome, so that the
         downstream consumer can treat the indicator to mean simply
         that the new window is subject to popup control. */
      nsCOMPtr<nsIWindowCreator2> windowCreator2(
        do_QueryInterface(mWindowCreator));
      if (windowCreator2) {
        uint32_t contextFlags = 0;
        bool popupConditions = false;

        // is the parent under popup conditions?
        if (parentWindow) {
          popupConditions = parentWindow->IsLoadingOrRunningTimeout();
        }

        // chrome is always allowed, so clear the flag if the opener is chrome
        if (popupConditions) {
          popupConditions = !isCallerChrome;
        }

        if (popupConditions) {
          contextFlags |=
            nsIWindowCreator2::PARENT_IS_LOADING_OR_RUNNING_TIMEOUT;
        }

        mozIDOMWindowProxy* openerWindow = aForceNoOpener ? nullptr : aParent;
        rv = CreateChromeWindow(features, parentChrome, chromeFlags, contextFlags,
                                nullptr, openerWindow, getter_AddRefs(newChrome));

      } else {
        rv = mWindowCreator->CreateChromeWindow(parentChrome, chromeFlags,
                                                getter_AddRefs(newChrome));
      }

      if (parentTopInnerWindow) {
        parentTopInnerWindow->Resume();
      }

      if (newChrome) {
        nsCOMPtr<nsIXULWindow> xulWin = do_GetInterface(newChrome);
        if (xulWin) {
          nsCOMPtr<nsIXULBrowserWindow> xulBrowserWin;
          xulWin->GetXULBrowserWindow(getter_AddRefs(xulBrowserWin));
          if (xulBrowserWin) {
            nsPIDOMWindowOuter* openerWindow = aForceNoOpener ? nullptr : parentWindow.get();
            xulBrowserWin->ForceInitialBrowserNonRemote(openerWindow);
          }
        }
        /* It might be a chrome nsXULWindow, in which case it won't have
            an nsIDOMWindow (primary content shell). But in that case, it'll
            be able to hand over an nsIDocShellTreeItem directly. */
        nsCOMPtr<nsPIDOMWindowOuter> newWindow(do_GetInterface(newChrome));
        if (newWindow) {
          GetWindowTreeItem(newWindow, getter_AddRefs(newDocShellItem));
        }
        if (!newDocShellItem) {
          newDocShellItem = do_GetInterface(newChrome);
        }
        if (!newDocShellItem) {
          rv = NS_ERROR_FAILURE;
        }
      }
    }
  }

  // better have a window to use by this point
  if (!newDocShellItem) {
    return rv;
  }

  nsCOMPtr<nsIDocShell> newDocShell(do_QueryInterface(newDocShellItem));
  NS_ENSURE_TRUE(newDocShell, NS_ERROR_UNEXPECTED);

  // If our parent is sandboxed, set it as the one permitted sandboxed navigator
  // on the new window we're opening.
  if (activeDocsSandboxFlags && parentWindow) {
    newDocShell->SetOnePermittedSandboxedNavigator(
      parentWindow->GetDocShell());
  }

  // Copy sandbox flags to the new window if activeDocsSandboxFlags says to do
  // so.  Note that it's only nonzero if the window is new, so clobbering
  // sandbox flags on the window makes sense in that case.
  if (activeDocsSandboxFlags &
        SANDBOX_PROPAGATES_TO_AUXILIARY_BROWSING_CONTEXTS) {
    newDocShell->SetSandboxFlags(activeDocsSandboxFlags);
  }

  rv = ReadyOpenedDocShellItem(newDocShellItem, parentWindow, windowIsNew,
                               aForceNoOpener, aResult);
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (isNewToplevelWindow) {
    nsCOMPtr<nsIDocShellTreeOwner> newTreeOwner;
    newDocShellItem->GetTreeOwner(getter_AddRefs(newTreeOwner));
    MaybeDisablePersistence(features, newTreeOwner);
  }

  if (aDialog && aArgv) {
    // Set the args on the new window.
    nsCOMPtr<nsPIDOMWindowOuter> piwin(do_QueryInterface(*aResult));
    NS_ENSURE_TRUE(piwin, NS_ERROR_UNEXPECTED);

    rv = piwin->SetArguments(aArgv);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  /* allow a window that we found by name to keep its name (important for cases
     like _self where the given name is different (and invalid)).  Also, _blank
     is not a window name. */
  if (windowNeedsName) {
    if (nameSpecified && !name.LowerCaseEqualsLiteral("_blank")) {
      newDocShellItem->SetName(name);
    } else {
      newDocShellItem->SetName(EmptyString());
    }
  }

  // Now we have to set the right opener principal on the new window.  Note
  // that we have to do this _before_ starting any URI loads, thanks to the
  // sync nature of javascript: loads.
  //
  // Note: The check for the current JSContext isn't necessarily sensical.
  // It's just designed to preserve old semantics during a mass-conversion
  // patch.
  nsCOMPtr<nsIPrincipal> subjectPrincipal =
    nsContentUtils::GetCurrentJSContext() ? nsContentUtils::SubjectPrincipal() :
                                            nullptr;

  bool isPrivateBrowsingWindow = false;

  if (windowIsNew) {
    auto* docShell = static_cast<nsDocShell*>(newDocShell.get());

    // If this is not a chrome docShell, we apply originAttributes from the
    // subjectPrincipal unless if it's an expanded or system principal.
    if (subjectPrincipal &&
        !nsContentUtils::IsSystemOrExpandedPrincipal(subjectPrincipal) &&
        docShell->ItemType() != nsIDocShellTreeItem::typeChrome) {
      DocShellOriginAttributes attrs;
      attrs.InheritFromDocToChildDocShell(BasePrincipal::Cast(subjectPrincipal)->OriginAttributesRef());
      isPrivateBrowsingWindow = !!attrs.mPrivateBrowsingId;
      docShell->SetOriginAttributes(attrs);
    } else {
      nsCOMPtr<nsIDocShellTreeItem> parentItem;
      GetWindowTreeItem(aParent, getter_AddRefs(parentItem));
      nsCOMPtr<nsILoadContext> parentContext = do_QueryInterface(parentItem);
      if (parentContext) {
        isPrivateBrowsingWindow = parentContext->UsePrivateBrowsing();
      }
    }

    bool autoPrivateBrowsing =
      Preferences::GetBool("browser.privatebrowsing.autostart");

    if (!autoPrivateBrowsing &&
        (chromeFlags & nsIWebBrowserChrome::CHROME_NON_PRIVATE_WINDOW)) {
      isPrivateBrowsingWindow = false;
    } else if (autoPrivateBrowsing ||
               (chromeFlags & nsIWebBrowserChrome::CHROME_PRIVATE_WINDOW)) {
      isPrivateBrowsingWindow = true;
    }

    // Now set the opener principal on the new window.  Note that we need to do
    // this no matter whether we were opened from JS; if there is nothing on
    // the JS stack, just use the principal of our parent window.  In those
    // cases we do _not_ set the parent window principal as the owner of the
    // load--since we really don't know who the owner is, just leave it null.
    nsCOMPtr<nsPIDOMWindowOuter> newWindow = do_QueryInterface(*aResult);
    NS_ASSERTION(newWindow == newDocShell->GetWindow(), "Different windows??");

    // The principal of the initial about:blank document gets set up in
    // nsWindowWatcher::AddWindow. Make sure to call it. In the common case
    // this call already happened when the window was created, but
    // SetInitialPrincipalToSubject is safe to call multiple times.
    if (newWindow) {
      newWindow->SetInitialPrincipalToSubject();
      if (aIsPopupSpam) {
        nsGlobalWindow* globalWin = nsGlobalWindow::Cast(newWindow);
        MOZ_ASSERT(!globalWin->IsPopupSpamWindow(),
                   "Who marked it as popup spam already???");
        if (!globalWin->IsPopupSpamWindow()) { // Make sure we don't mess up our
                                               // counter even if the above
                                               // assert fails.
          globalWin->SetIsPopupSpamWindow(true);
        }
      }
    }
  }

  // We rely on CalculateChromeFlags to decide whether remote (out-of-process)
  // tabs should be used.
  bool isRemoteWindow =
    !!(chromeFlags & nsIWebBrowserChrome::CHROME_REMOTE_WINDOW);

  if (isNewToplevelWindow) {
    nsCOMPtr<nsIDocShellTreeItem> childRoot;
    newDocShellItem->GetRootTreeItem(getter_AddRefs(childRoot));
    nsCOMPtr<nsILoadContext> childContext = do_QueryInterface(childRoot);
    if (childContext) {
      childContext->SetPrivateBrowsing(isPrivateBrowsingWindow);
      childContext->SetRemoteTabs(isRemoteWindow);
    }
  } else if (windowIsNew) {
    nsCOMPtr<nsILoadContext> childContext = do_QueryInterface(newDocShellItem);
    if (childContext) {
      childContext->SetPrivateBrowsing(isPrivateBrowsingWindow);
      childContext->SetRemoteTabs(isRemoteWindow);
    }
  }

  nsCOMPtr<nsIDocShellLoadInfo> loadInfo = aLoadInfo;
  if (uriToLoad && aNavigate && !loadInfo) {
    newDocShell->CreateLoadInfo(getter_AddRefs(loadInfo));
    NS_ENSURE_TRUE(loadInfo, NS_ERROR_FAILURE);

    if (subjectPrincipal) {
      loadInfo->SetTriggeringPrincipal(subjectPrincipal);
    }

    /* use the URL from the *extant* document, if any. The usual accessor
       GetDocument will synchronously create an about:blank document if
       it has no better answer, and we only care about a real document.
       Also using GetDocument to force document creation seems to
       screw up focus in the hidden window; see bug 36016.
    */
    nsCOMPtr<nsIDocument> doc = GetEntryDocument();
    if (!doc && parentWindow) {
      doc = parentWindow->GetExtantDoc();
    }
    if (doc) {
      // Set the referrer
      loadInfo->SetReferrer(doc->GetDocumentURI());
      loadInfo->SetReferrerPolicy(doc->GetReferrerPolicy());
    }
  }

  if (isNewToplevelWindow) {
    // Notify observers that the window is open and ready.
    // The window has not yet started to load a document.
    nsCOMPtr<nsIObserverService> obsSvc =
      mozilla::services::GetObserverService();
    if (obsSvc) {
      obsSvc->NotifyObservers(*aResult, "toplevel-window-ready", nullptr);
    }
  }

  // Before loading the URI we want to be 100% sure that we use the correct
  // userContextId.
  MOZ_ASSERT(CheckUserContextCompatibility(newDocShell));

  if (uriToLoad && aNavigate) {
    newDocShell->LoadURI(
      uriToLoad,
      loadInfo,
      windowIsNew ?
        static_cast<uint32_t>(nsIWebNavigation::LOAD_FLAGS_FIRST_LOAD) :
        static_cast<uint32_t>(nsIWebNavigation::LOAD_FLAGS_NONE),
      true);
  }

  // Copy the current session storage for the current domain.
  if (subjectPrincipal && parentDocShell) {
    nsCOMPtr<nsIDOMStorageManager> parentStorageManager =
      do_QueryInterface(parentDocShell);
    nsCOMPtr<nsIDOMStorageManager> newStorageManager =
      do_QueryInterface(newDocShell);

    if (parentStorageManager && newStorageManager) {
      nsCOMPtr<nsIDOMStorage> storage;
      nsCOMPtr<nsPIDOMWindowInner> pInnerWin = parentWindow->GetCurrentInnerWindow();

      parentStorageManager->GetStorage(pInnerWin, subjectPrincipal,
                                       isPrivateBrowsingWindow,
                                       getter_AddRefs(storage));
      if (storage) {
        newStorageManager->CloneStorage(storage);
      }
    }
  }

  if (isNewToplevelWindow) {
    nsCOMPtr<nsIDocShellTreeOwner> newTreeOwner;
    newDocShellItem->GetTreeOwner(getter_AddRefs(newTreeOwner));
    SizeOpenedWindow(newTreeOwner, aParent, isCallerChrome, sizeSpec);
  }

  if (windowIsModal) {
    nsCOMPtr<nsIDocShellTreeOwner> newTreeOwner;
    newDocShellItem->GetTreeOwner(getter_AddRefs(newTreeOwner));
    nsCOMPtr<nsIWebBrowserChrome> newChrome(do_GetInterface(newTreeOwner));

    // Throw an exception here if no web browser chrome is available,
    // we need that to show a modal window.
    NS_ENSURE_TRUE(newChrome, NS_ERROR_NOT_AVAILABLE);

    // Dispatch dialog events etc, but we only want to do that if
    // we're opening a modal content window (the helper classes are
    // no-ops if given no window), for chrome dialogs we don't want to
    // do any of that (it's done elsewhere for us).
    // Make sure we maintain the state on an outer window, because
    // that's where it lives; inner windows assert if you try to
    // maintain the state on them.
    nsAutoWindowStateHelper windowStateHelper(
      parentWindow ? parentWindow->GetOuterWindow() : nullptr);

    if (!windowStateHelper.DefaultEnabled()) {
      // Default to cancel not opening the modal window.
      NS_RELEASE(*aResult);

      return NS_OK;
    }

    bool isAppModal = false;
    nsCOMPtr<nsIBaseWindow> parentWindow(do_GetInterface(newTreeOwner));
    nsCOMPtr<nsIWidget> parentWidget;
    if (parentWindow) {
      parentWindow->GetMainWidget(getter_AddRefs(parentWidget));
      if (parentWidget) {
        isAppModal = parentWidget->IsRunningAppModal();
      }
    }
    if (parentWidget &&
        ((!newWindowShouldBeModal && parentIsModal) || isAppModal)) {
      parentWidget->SetFakeModal(true);
    } else {
      // Reset popup state while opening a modal dialog, and firing
      // events about the dialog, to prevent the current state from
      // being active the whole time a modal dialog is open.
      nsAutoPopupStatePusher popupStatePusher(openAbused);

      newChrome->ShowAsModal();
    }
  }

  // If a website opens a popup exit DOM fullscreen
  if (windowIsNew && aCalledFromJS && !hasChromeParent && !isCallerChrome &&
      parentWindow) {
    nsIDocument::AsyncExitFullscreen(parentWindow->GetDoc());
  }
			
  if (aForceNoOpener && windowIsNew) {
    NS_RELEASE(*aResult);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::RegisterNotification(nsIObserver* aObserver)
{
  // just a convenience method; it delegates to nsIObserverService

  if (!aObserver) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
  if (!os) {
    return NS_ERROR_FAILURE;
  }

  nsresult rv = os->AddObserver(aObserver, "domwindowopened", false);
  if (NS_SUCCEEDED(rv)) {
    rv = os->AddObserver(aObserver, "domwindowclosed", false);
  }

  return rv;
}

NS_IMETHODIMP
nsWindowWatcher::UnregisterNotification(nsIObserver* aObserver)
{
  // just a convenience method; it delegates to nsIObserverService

  if (!aObserver) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
  if (!os) {
    return NS_ERROR_FAILURE;
  }

  os->RemoveObserver(aObserver, "domwindowopened");
  os->RemoveObserver(aObserver, "domwindowclosed");

  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::GetWindowEnumerator(nsISimpleEnumerator** aResult)
{
  if (!aResult) {
    return NS_ERROR_INVALID_ARG;
  }

  MutexAutoLock lock(mListLock);
  nsWatcherWindowEnumerator* enumerator = new nsWatcherWindowEnumerator(this);
  if (enumerator) {
    return CallQueryInterface(enumerator, aResult);
  }

  return NS_ERROR_OUT_OF_MEMORY;
}

NS_IMETHODIMP
nsWindowWatcher::GetNewPrompter(mozIDOMWindowProxy* aParent, nsIPrompt** aResult)
{
  // This is for backwards compat only. Callers should just use the prompt
  // service directly.
  nsresult rv;
  nsCOMPtr<nsIPromptFactory> factory =
    do_GetService("@mozilla.org/prompter;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  return factory->GetPrompt(aParent, NS_GET_IID(nsIPrompt),
                            reinterpret_cast<void**>(aResult));
}

NS_IMETHODIMP
nsWindowWatcher::GetNewAuthPrompter(mozIDOMWindowProxy* aParent,
                                    nsIAuthPrompt** aResult)
{
  // This is for backwards compat only. Callers should just use the prompt
  // service directly.
  nsresult rv;
  nsCOMPtr<nsIPromptFactory> factory =
    do_GetService("@mozilla.org/prompter;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  return factory->GetPrompt(aParent, NS_GET_IID(nsIAuthPrompt),
                            reinterpret_cast<void**>(aResult));
}

NS_IMETHODIMP
nsWindowWatcher::GetPrompt(mozIDOMWindowProxy* aParent, const nsIID& aIID,
                           void** aResult)
{
  // This is for backwards compat only. Callers should just use the prompt
  // service directly.
  nsresult rv;
  nsCOMPtr<nsIPromptFactory> factory =
    do_GetService("@mozilla.org/prompter;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = factory->GetPrompt(aParent, aIID, aResult);

  // Allow for an embedding implementation to not support nsIAuthPrompt2.
  if (rv == NS_NOINTERFACE && aIID.Equals(NS_GET_IID(nsIAuthPrompt2))) {
    nsCOMPtr<nsIAuthPrompt> oldPrompt;
    rv = factory->GetPrompt(
      aParent, NS_GET_IID(nsIAuthPrompt), getter_AddRefs(oldPrompt));
    NS_ENSURE_SUCCESS(rv, rv);

    NS_WrapAuthPrompt(oldPrompt, reinterpret_cast<nsIAuthPrompt2**>(aResult));
    if (!*aResult) {
      rv = NS_ERROR_NOT_AVAILABLE;
    }
  }
  return rv;
}

NS_IMETHODIMP
nsWindowWatcher::SetWindowCreator(nsIWindowCreator* aCreator)
{
  mWindowCreator = aCreator;
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::HasWindowCreator(bool* aResult)
{
  *aResult = mWindowCreator;
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::GetActiveWindow(mozIDOMWindowProxy** aActiveWindow)
{
  *aActiveWindow = nullptr;
  nsCOMPtr<nsIFocusManager> fm = do_GetService(FOCUSMANAGER_CONTRACTID);
  if (fm) {
    return fm->GetActiveWindow(aActiveWindow);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::SetActiveWindow(mozIDOMWindowProxy* aActiveWindow)
{
  nsCOMPtr<nsIFocusManager> fm = do_GetService(FOCUSMANAGER_CONTRACTID);
  if (fm) {
    return fm->SetActiveWindow(aActiveWindow);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::AddWindow(mozIDOMWindowProxy* aWindow, nsIWebBrowserChrome* aChrome)
{
  if (!aWindow) {
    return NS_ERROR_INVALID_ARG;
  }

#ifdef DEBUG
  {
    nsCOMPtr<nsPIDOMWindowOuter> win(do_QueryInterface(aWindow));

    NS_ASSERTION(win->IsOuterWindow(),
                 "Uh, the active window must be an outer window!");
  }
#endif

  {
    nsWatcherWindowEntry* info;
    MutexAutoLock lock(mListLock);

    // if we already have an entry for this window, adjust
    // its chrome mapping and return
    info = FindWindowEntry(aWindow);
    if (info) {
      nsCOMPtr<nsISupportsWeakReference> supportsweak(
        do_QueryInterface(aChrome));
      if (supportsweak) {
        supportsweak->GetWeakReference(getter_AddRefs(info->mChromeWeak));
      } else {
        info->mChrome = aChrome;
        info->mChromeWeak = nullptr;
      }
      return NS_OK;
    }

    // create a window info struct and add it to the list of windows
    info = new nsWatcherWindowEntry(aWindow, aChrome);
    if (!info) {
      return NS_ERROR_OUT_OF_MEMORY;
    }

    if (mOldestWindow) {
      info->InsertAfter(mOldestWindow->mOlder);
    } else {
      mOldestWindow = info;
    }
  } // leave the mListLock

  // a window being added to us signifies a newly opened window.
  // send notifications.
  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
  if (!os) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISupports> domwin(do_QueryInterface(aWindow));
  return os->NotifyObservers(domwin, "domwindowopened", 0);
}

NS_IMETHODIMP
nsWindowWatcher::RemoveWindow(mozIDOMWindowProxy* aWindow)
{
  // find the corresponding nsWatcherWindowEntry, remove it

  if (!aWindow) {
    return NS_ERROR_INVALID_ARG;
  }

  nsWatcherWindowEntry* info = FindWindowEntry(aWindow);
  if (info) {
    RemoveWindow(info);
    return NS_OK;
  }
  NS_WARNING("requested removal of nonexistent window");
  return NS_ERROR_INVALID_ARG;
}

nsWatcherWindowEntry*
nsWindowWatcher::FindWindowEntry(mozIDOMWindowProxy* aWindow)
{
  // find the corresponding nsWatcherWindowEntry
  nsWatcherWindowEntry* info;
  nsWatcherWindowEntry* listEnd;
#ifdef USEWEAKREFS
  nsresult rv;
  bool found;
#endif

  info = mOldestWindow;
  listEnd = 0;
#ifdef USEWEAKREFS
  rv = NS_OK;
  found = false;
  while (info != listEnd && NS_SUCCEEDED(rv)) {
    nsCOMPtr<mozIDOMWindowProxy> infoWindow(do_QueryReferent(info->mWindow));
    if (!infoWindow) { // clean up dangling reference, while we're here
      rv = RemoveWindow(info);
    } else if (infoWindow.get() == aWindow) {
      return info;
    }

    info = info->mYounger;
    listEnd = mOldestWindow;
  }
  return 0;
#else
  while (info != listEnd) {
    if (info->mWindow == aWindow) {
      return info;
    }
    info = info->mYounger;
    listEnd = mOldestWindow;
  }
  return 0;
#endif
}

nsresult
nsWindowWatcher::RemoveWindow(nsWatcherWindowEntry* aInfo)
{
  uint32_t count = mEnumeratorList.Length();

  {
    // notify the enumerators
    MutexAutoLock lock(mListLock);
    for (uint32_t ctr = 0; ctr < count; ++ctr) {
      mEnumeratorList[ctr]->WindowRemoved(aInfo);
    }

    // remove the element from the list
    if (aInfo == mOldestWindow) {
      mOldestWindow = aInfo->mYounger == mOldestWindow ? 0 : aInfo->mYounger;
    }
    aInfo->Unlink();
  }

  // a window being removed from us signifies a newly closed window.
  // send notifications.
  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
  if (os) {
#ifdef USEWEAKREFS
    nsCOMPtr<nsISupports> domwin(do_QueryReferent(aInfo->mWindow));
    if (domwin) {
      os->NotifyObservers(domwin, "domwindowclosed", 0);
    }
    // else bummer. since the window is gone, there's nothing to notify with.
#else
    nsCOMPtr<nsISupports> domwin(do_QueryInterface(aInfo->mWindow));
    os->NotifyObservers(domwin, "domwindowclosed", 0);
#endif
  }

  delete aInfo;
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::GetChromeForWindow(mozIDOMWindowProxy* aWindow,
                                    nsIWebBrowserChrome** aResult)
{
  if (!aWindow || !aResult) {
    return NS_ERROR_INVALID_ARG;
  }
  *aResult = 0;

  MutexAutoLock lock(mListLock);
  nsWatcherWindowEntry* info = FindWindowEntry(aWindow);
  if (info) {
    if (info->mChromeWeak) {
      return info->mChromeWeak->QueryReferent(
        NS_GET_IID(nsIWebBrowserChrome), reinterpret_cast<void**>(aResult));
    }
    *aResult = info->mChrome;
    NS_IF_ADDREF(*aResult);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsWindowWatcher::GetWindowByName(const nsAString& aTargetName,
                                 mozIDOMWindowProxy* aCurrentWindow,
                                 mozIDOMWindowProxy** aResult)
{
  if (!aResult) {
    return NS_ERROR_INVALID_ARG;
  }

  *aResult = nullptr;

  nsPIDOMWindowOuter* currentWindow =
    aCurrentWindow ? nsPIDOMWindowOuter::From(aCurrentWindow) : nullptr;

  nsCOMPtr<nsIDocShellTreeItem> treeItem;

  nsCOMPtr<nsIDocShellTreeItem> startItem;
  GetWindowTreeItem(currentWindow, getter_AddRefs(startItem));
  if (startItem) {
    // Note: original requestor is null here, per idl comments
    startItem->FindItemWithName(aTargetName, nullptr, nullptr,
                                getter_AddRefs(treeItem));
  } else {
    // Note: original requestor is null here, per idl comments
    FindItemWithName(aTargetName, nullptr, nullptr, getter_AddRefs(treeItem));
  }

  if (treeItem) {
    nsCOMPtr<nsPIDOMWindowOuter> domWindow = treeItem->GetWindow();
    domWindow.forget(aResult);
  }

  return NS_OK;
}

bool
nsWindowWatcher::AddEnumerator(nsWatcherWindowEnumerator* aEnumerator)
{
  // (requires a lock; assumes it's called by someone holding the lock)
  return mEnumeratorList.AppendElement(aEnumerator) != nullptr;
}

bool
nsWindowWatcher::RemoveEnumerator(nsWatcherWindowEnumerator* aEnumerator)
{
  // (requires a lock; assumes it's called by someone holding the lock)
  return mEnumeratorList.RemoveElement(aEnumerator);
}

nsresult
nsWindowWatcher::URIfromURL(const char* aURL,
                            mozIDOMWindowProxy* aParent,
                            nsIURI** aURI)
{
  // Build the URI relative to the entry global.
  nsCOMPtr<nsPIDOMWindowInner> baseWindow = do_QueryInterface(GetEntryGlobal());

  // failing that, build it relative to the parent window, if possible
  if (!baseWindow && aParent) {
    baseWindow = nsPIDOMWindowOuter::From(aParent)->GetCurrentInnerWindow();
  }

  // failing that, use the given URL unmodified. It had better not be relative.

  nsIURI* baseURI = nullptr;

  // get baseWindow's document URI
  if (baseWindow) {
    if (nsIDocument* doc = baseWindow->GetDoc()) {
      baseURI = doc->GetDocBaseURI();
    }
  }

  // build and return the absolute URI
  return NS_NewURI(aURI, aURL, baseURI);
}

#define NS_CALCULATE_CHROME_FLAG_FOR(feature, flag)                       \
  prefBranch->GetBoolPref(feature, &forceEnable);                     \
  if (forceEnable && !aDialog && !aHasChromeParent && !aChromeURL) {  \
    chromeFlags |= flag;                                              \
  } else {                                                            \
    chromeFlags |=                                                    \
      WinHasOption(aFeatures, feature, 0, &presenceFlag) ? flag : 0;  \
  }

// static
uint32_t
nsWindowWatcher::CalculateChromeFlagsHelper(uint32_t aInitialFlags,
                                            const nsACString& aFeatures,
                                            bool& presenceFlag,
                                            bool aDialog,
                                            bool aHasChromeParent,
                                            bool aChromeURL)
{
  uint32_t chromeFlags = aInitialFlags;

  nsresult rv;
  nsCOMPtr<nsIPrefBranch> prefBranch;
  nsCOMPtr<nsIPrefService> prefs =
    do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);

  NS_ENSURE_SUCCESS(rv, nsIWebBrowserChrome::CHROME_DEFAULT);

  rv = prefs->GetBranch("dom.disable_window_open_feature.",
                        getter_AddRefs(prefBranch));

  NS_ENSURE_SUCCESS(rv, nsIWebBrowserChrome::CHROME_DEFAULT);

  // NS_CALCULATE_CHROME_FLAG_FOR requires aFeatures, forceEnable, aDialog
  // aHasChromeParent, aChromeURL, presenceFlag and chromeFlags to be in
  // scope.
  bool forceEnable = false;

  NS_CALCULATE_CHROME_FLAG_FOR("titlebar",
                               nsIWebBrowserChrome::CHROME_TITLEBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("close",
                               nsIWebBrowserChrome::CHROME_WINDOW_CLOSE);
  NS_CALCULATE_CHROME_FLAG_FOR("toolbar",
                               nsIWebBrowserChrome::CHROME_TOOLBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("location",
                               nsIWebBrowserChrome::CHROME_LOCATIONBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("personalbar",
                               nsIWebBrowserChrome::CHROME_PERSONAL_TOOLBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("status",
                               nsIWebBrowserChrome::CHROME_STATUSBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("menubar",
                               nsIWebBrowserChrome::CHROME_MENUBAR);
  NS_CALCULATE_CHROME_FLAG_FOR("resizable",
                               nsIWebBrowserChrome::CHROME_WINDOW_RESIZE);
  NS_CALCULATE_CHROME_FLAG_FOR("minimizable",
                               nsIWebBrowserChrome::CHROME_WINDOW_MIN);

  // default scrollbar to "on," unless explicitly turned off
  if (WinHasOption(aFeatures, "scrollbars", 1, &presenceFlag) || !presenceFlag) {
    chromeFlags |= nsIWebBrowserChrome::CHROME_SCROLLBARS;
  }

  return chromeFlags;
}

// static
uint32_t
nsWindowWatcher::EnsureFlagsSafeForContent(uint32_t aChromeFlags,
                                           bool aChromeURL)
{
  aChromeFlags |= nsIWebBrowserChrome::CHROME_TITLEBAR;
  aChromeFlags |= nsIWebBrowserChrome::CHROME_WINDOW_CLOSE;
  aChromeFlags &= ~nsIWebBrowserChrome::CHROME_WINDOW_LOWERED;
  aChromeFlags &= ~nsIWebBrowserChrome::CHROME_WINDOW_RAISED;
  aChromeFlags &= ~nsIWebBrowserChrome::CHROME_WINDOW_POPUP;
  /* Untrusted script is allowed to pose modal windows with a chrome
     scheme. This check could stand to be better. But it effectively
     prevents untrusted script from opening modal windows in general
     while still allowing alerts and the like. */
  if (!aChromeURL) {
    aChromeFlags &= ~(nsIWebBrowserChrome::CHROME_MODAL |
                     nsIWebBrowserChrome::CHROME_OPENAS_CHROME);
  }

  if (!(aChromeFlags & nsIWebBrowserChrome::CHROME_OPENAS_CHROME)) {
    aChromeFlags &= ~nsIWebBrowserChrome::CHROME_DEPENDENT;
  }

  return aChromeFlags;
}

/**
 * Calculate the chrome bitmask from a string list of features requested
 * from a child process. Feature strings that are restricted to the parent
 * process are ignored here.
 * @param aFeatures a string containing a list of named features
 * @return the chrome bitmask
 */
// static
uint32_t
nsWindowWatcher::CalculateChromeFlagsForChild(const nsACString& aFeatures)
{
  if (aFeatures.IsVoid()) {
    return nsIWebBrowserChrome::CHROME_ALL;
  }

  bool presenceFlag = false;
  uint32_t chromeFlags = CalculateChromeFlagsHelper(
    nsIWebBrowserChrome::CHROME_WINDOW_BORDERS, aFeatures, presenceFlag);

  return EnsureFlagsSafeForContent(chromeFlags);
}

/**
 * Calculate the chrome bitmask from a string list of features for a new
 * privileged window.
 * @param aParent the opener window
 * @param aFeatures a string containing a list of named chrome features
 * @param aDialog affects the assumptions made about unnamed features
 * @param aChromeURL true if the window is being sent to a chrome:// URL
 * @param aHasChromeParent true if the parent window is privileged
 * @param aCalledFromJS true if the window open request came from script.
 * @return the chrome bitmask
 */
// static
uint32_t
nsWindowWatcher::CalculateChromeFlagsForParent(mozIDOMWindowProxy* aParent,
                                               const nsACString& aFeatures,
                                               bool aDialog,
                                               bool aChromeURL,
                                               bool aHasChromeParent,
                                               bool aCalledFromJS)
{
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(nsContentUtils::LegacyIsCallerChromeOrNativeCode());

  uint32_t chromeFlags = 0;

  // The features string is made void by OpenWindowInternal
  // if nullptr was originally passed as the features string.
  if (aFeatures.IsVoid()) {
    chromeFlags = nsIWebBrowserChrome::CHROME_ALL;
    if (aDialog) {
      chromeFlags |= nsIWebBrowserChrome::CHROME_OPENAS_DIALOG |
                     nsIWebBrowserChrome::CHROME_OPENAS_CHROME;
    }
  } else {
    chromeFlags = nsIWebBrowserChrome::CHROME_WINDOW_BORDERS;
  }

  /* This function has become complicated since browser windows and
     dialogs diverged. The difference is, browser windows assume all
     chrome not explicitly mentioned is off, if the features string
     is not null. Exceptions are some OS border chrome new with Mozilla.
     Dialogs interpret a (mostly) empty features string to mean
     "OS's choice," and also support an "all" flag explicitly disallowed
     in the standards-compliant window.(normal)open. */

  bool presenceFlag = false;
  if (aDialog && WinHasOption(aFeatures, "all", 0, &presenceFlag)) {
    chromeFlags = nsIWebBrowserChrome::CHROME_ALL;
  }

  /* Next, allow explicitly named options to override the initial settings */
  chromeFlags = CalculateChromeFlagsHelper(chromeFlags, aFeatures, presenceFlag,
                                           aDialog, aHasChromeParent, aChromeURL);

  // Determine whether the window is a private browsing window
  chromeFlags |= WinHasOption(aFeatures, "private", 0, &presenceFlag) ?
    nsIWebBrowserChrome::CHROME_PRIVATE_WINDOW : 0;
  chromeFlags |= WinHasOption(aFeatures, "non-private", 0, &presenceFlag) ?
    nsIWebBrowserChrome::CHROME_NON_PRIVATE_WINDOW : 0;

  // Determine whether the window should have remote tabs.
  bool remote = BrowserTabsRemoteAutostart();

  if (remote) {
    remote = !WinHasOption(aFeatures, "non-remote", 0, &presenceFlag);
  } else {
    remote = WinHasOption(aFeatures, "remote", 0, &presenceFlag);
  }

  if (remote) {
    chromeFlags |= nsIWebBrowserChrome::CHROME_REMOTE_WINDOW;
  }

  chromeFlags |= WinHasOption(aFeatures, "popup", 0, &presenceFlag) ?
    nsIWebBrowserChrome::CHROME_WINDOW_POPUP : 0;

  /* OK.
     Normal browser windows, in spite of a stated pattern of turning off
     all chrome not mentioned explicitly, will want the new OS chrome (window
     borders, titlebars, closebox) on, unless explicitly turned off.
     Dialogs, on the other hand, take the absence of any explicit settings
     to mean "OS' choice." */

  // default titlebar and closebox to "on," if not mentioned at all
  if (!(chromeFlags & nsIWebBrowserChrome::CHROME_WINDOW_POPUP)) {
    if (!PL_strcasestr(aFeatures.BeginReading(), "titlebar")) {
      chromeFlags |= nsIWebBrowserChrome::CHROME_TITLEBAR;
    }
    if (!PL_strcasestr(aFeatures.BeginReading(), "close")) {
      chromeFlags |= nsIWebBrowserChrome::CHROME_WINDOW_CLOSE;
    }
  }

  if (aDialog && !aFeatures.IsVoid() && !presenceFlag) {
    chromeFlags = nsIWebBrowserChrome::CHROME_DEFAULT;
  }

  /* Finally, once all the above normal chrome has been divined, deal
     with the features that are more operating hints than appearance
     instructions. (Note modality implies dependence.) */

  if (WinHasOption(aFeatures, "alwaysLowered", 0, nullptr) ||
      WinHasOption(aFeatures, "z-lock", 0, nullptr)) {
    chromeFlags |= nsIWebBrowserChrome::CHROME_WINDOW_LOWERED;
  } else if (WinHasOption(aFeatures, "alwaysRaised", 0, nullptr)) {
    chromeFlags |= nsIWebBrowserChrome::CHROME_WINDOW_RAISED;
  }

  chromeFlags |= WinHasOption(aFeatures, "macsuppressanimation", 0, nullptr) ?
    nsIWebBrowserChrome::CHROME_MAC_SUPPRESS_ANIMATION : 0;

  chromeFlags |= WinHasOption(aFeatures, "chrome", 0, nullptr) ?
    nsIWebBrowserChrome::CHROME_OPENAS_CHROME : 0;
  chromeFlags |= WinHasOption(aFeatures, "extrachrome", 0, nullptr) ?
    nsIWebBrowserChrome::CHROME_EXTRA : 0;
  chromeFlags |= WinHasOption(aFeatures, "centerscreen", 0, nullptr) ?
    nsIWebBrowserChrome::CHROME_CENTER_SCREEN : 0;
  chromeFlags |= WinHasOption(aFeatures, "dependent", 0, nullptr) ?
    nsIWebBrowserChrome::CHROME_DEPENDENT : 0;
  chromeFlags |= WinHasOption(aFeatures, "modal", 0, nullptr) ?
    (nsIWebBrowserChrome::CHROME_MODAL | nsIWebBrowserChrome::CHROME_DEPENDENT) : 0;

  /* On mobile we want to ignore the dialog window feature, since the mobile UI
     does not provide any affordance for dialog windows. This does not interfere
     with dialog windows created through openDialog. */
  bool disableDialogFeature = false;
  nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);

  branch->GetBoolPref("dom.disable_window_open_dialog_feature",
                      &disableDialogFeature);

  if (!disableDialogFeature) {
    chromeFlags |= WinHasOption(aFeatures, "dialog", 0, nullptr) ?
      nsIWebBrowserChrome::CHROME_OPENAS_DIALOG : 0;
  }

  /* and dialogs need to have the last word. assume dialogs are dialogs,
     and opened as chrome, unless explicitly told otherwise. */
  if (aDialog) {
    if (!PL_strcasestr(aFeatures.BeginReading(), "dialog")) {
      chromeFlags |= nsIWebBrowserChrome::CHROME_OPENAS_DIALOG;
    }
    if (!PL_strcasestr(aFeatures.BeginReading(), "chrome")) {
      chromeFlags |= nsIWebBrowserChrome::CHROME_OPENAS_CHROME;
    }
  }

  /* missing
     chromeFlags->copy_history
   */

  // Check security state for use in determing window dimensions
  if (!aHasChromeParent) {
    chromeFlags = EnsureFlagsSafeForContent(chromeFlags, aChromeURL);
  }

  // Disable CHROME_OPENAS_DIALOG if the window is inside <iframe mozbrowser>.
  // It's up to the embedder to interpret what dialog=1 means.
  nsCOMPtr<nsIDocShell> docshell = do_GetInterface(aParent);
  if (docshell && docshell->GetIsInMozBrowserOrApp()) {
    chromeFlags &= ~nsIWebBrowserChrome::CHROME_OPENAS_DIALOG;
  }

  return chromeFlags;
}

// static
int32_t
nsWindowWatcher::WinHasOption(const nsACString& aOptions, const char* aName,
                              int32_t aDefault, bool* aPresenceFlag)
{
  if (aOptions.IsEmpty()) {
    return 0;
  }

  const char* options = aOptions.BeginReading();
  char* comma;
  char* equal;
  int32_t found = 0;

#ifdef DEBUG
  NS_ASSERTION(nsAutoCString(aOptions).FindCharInSet(" \n\r\t") == kNotFound,
               "There should be no whitespace in this string!");
#endif

  while (true) {
    comma = PL_strchr(options, ',');
    if (comma) {
      *comma = '\0';
    }
    equal = PL_strchr(options, '=');
    if (equal) {
      *equal = '\0';
    }
    if (nsCRT::strcasecmp(options, aName) == 0) {
      if (aPresenceFlag) {
        *aPresenceFlag = true;
      }
      if (equal)
        if (*(equal + 1) == '*') {
          found = aDefault;
        } else if (nsCRT::strcasecmp(equal + 1, "yes") == 0) {
          found = 1;
        } else {
          found = atoi(equal + 1);
        }
      else {
        found = 1;
      }
    }
    if (equal) {
      *equal = '=';
    }
    if (comma) {
      *comma = ',';
    }
    if (found || !comma) {
      break;
    }
    options = comma + 1;
  }
  return found;
}

/* try to find an nsIDocShellTreeItem with the given name in any
   known open window. a failure to find the item will not
   necessarily return a failure method value. check aFoundItem.
*/
NS_IMETHODIMP
nsWindowWatcher::FindItemWithName(const nsAString& aName,
                                  nsIDocShellTreeItem* aRequestor,
                                  nsIDocShellTreeItem* aOriginalRequestor,
                                  nsIDocShellTreeItem** aFoundItem)
{
  *aFoundItem = nullptr;
  if (aName.IsEmpty()) {
    return NS_OK;
  }

  if (aName.LowerCaseEqualsLiteral("_blank") ||
      aName.LowerCaseEqualsLiteral("_top") ||
      aName.LowerCaseEqualsLiteral("_parent") ||
      aName.LowerCaseEqualsLiteral("_self")) {
    return NS_OK;
  }

  // If we are looking for an item and we don't have a docshell we are checking
  // on, let's just look in the chrome tab group!
  return TabGroup::GetChromeTabGroup()->FindItemWithName(aName,
                                                         aRequestor,
                                                         aOriginalRequestor,
                                                         aFoundItem);
}

already_AddRefed<nsIDocShellTreeItem>
nsWindowWatcher::GetCallerTreeItem(nsIDocShellTreeItem* aParentItem)
{
  nsCOMPtr<nsIWebNavigation> callerWebNav = do_GetInterface(GetEntryGlobal());
  nsCOMPtr<nsIDocShellTreeItem> callerItem = do_QueryInterface(callerWebNav);
  if (!callerItem) {
    callerItem = aParentItem;
  }

  return callerItem.forget();
}

nsPIDOMWindowOuter*
nsWindowWatcher::SafeGetWindowByName(const nsAString& aName,
                                     bool aForceNoOpener,
                                     mozIDOMWindowProxy* aCurrentWindow)
{
  if (aForceNoOpener) {
    if (!aName.LowerCaseEqualsLiteral("_self") &&
        !aName.LowerCaseEqualsLiteral("_top") &&
        !aName.LowerCaseEqualsLiteral("_parent")) {
      // Ignore all other names in the noopener case.
      return nullptr;
    }
  }

  nsCOMPtr<nsIDocShellTreeItem> startItem;
  GetWindowTreeItem(aCurrentWindow, getter_AddRefs(startItem));

  nsCOMPtr<nsIDocShellTreeItem> callerItem = GetCallerTreeItem(startItem);

  nsCOMPtr<nsIDocShellTreeItem> foundItem;
  if (startItem) {
    startItem->FindItemWithName(aName, nullptr, callerItem,
                                getter_AddRefs(foundItem));
  } else {
    FindItemWithName(aName, nullptr, callerItem,
                     getter_AddRefs(foundItem));
  }

  return foundItem ? foundItem->GetWindow() : nullptr;
}

/* Fetch the nsIDOMWindow corresponding to the given nsIDocShellTreeItem.
   This forces the creation of a script context, if one has not already
   been created. Note it also sets the window's opener to the parent,
   if applicable -- because it's just convenient, that's all. null aParent
   is acceptable. */
nsresult
nsWindowWatcher::ReadyOpenedDocShellItem(nsIDocShellTreeItem* aOpenedItem,
                                         nsPIDOMWindowOuter* aParent,
                                         bool aWindowIsNew,
                                         bool aForceNoOpener,
                                         mozIDOMWindowProxy** aOpenedWindow)
{
  nsresult rv = NS_ERROR_FAILURE;

  NS_ENSURE_ARG(aOpenedWindow);

  *aOpenedWindow = 0;
  nsCOMPtr<nsPIDOMWindowOuter> piOpenedWindow = aOpenedItem->GetWindow();
  if (piOpenedWindow) {
    if (!aForceNoOpener) {
      piOpenedWindow->SetOpenerWindow(aParent, aWindowIsNew); // damnit
    } else if (aParent && aParent != piOpenedWindow) {
      MOZ_ASSERT(piOpenedWindow->TabGroup() != aParent->TabGroup(),
                 "If we're forcing no opener, they should be in different tab groups");
    }

    if (aWindowIsNew) {
#ifdef DEBUG
      // Assert that we're not loading things right now.  If we are, when
      // that load completes it will clobber whatever principals we set up
      // on this new window!
      nsCOMPtr<nsIDocumentLoader> docloader = do_QueryInterface(aOpenedItem);
      NS_ASSERTION(docloader, "How can we not have a docloader here?");

      nsCOMPtr<nsIChannel> chan;
      docloader->GetDocumentChannel(getter_AddRefs(chan));
      NS_ASSERTION(!chan, "Why is there a document channel?");
#endif

      nsCOMPtr<nsIDocument> doc = piOpenedWindow->GetExtantDoc();
      if (doc) {
        doc->SetIsInitialDocument(true);
      }
    }
    rv = CallQueryInterface(piOpenedWindow, aOpenedWindow);
  }
  return rv;
}

// static
void
nsWindowWatcher::CalcSizeSpec(const nsACString& aFeatures, SizeSpec& aResult)
{
  // Parse position spec, if any, from aFeatures
  bool present;
  int32_t temp;

  present = false;
  if ((temp = WinHasOption(aFeatures, "left", 0, &present)) || present) {
    aResult.mLeft = temp;
  } else if ((temp = WinHasOption(aFeatures, "screenX", 0, &present)) ||
             present) {
    aResult.mLeft = temp;
  }
  aResult.mLeftSpecified = present;

  present = false;
  if ((temp = WinHasOption(aFeatures, "top", 0, &present)) || present) {
    aResult.mTop = temp;
  } else if ((temp = WinHasOption(aFeatures, "screenY", 0, &present)) ||
             present) {
    aResult.mTop = temp;
  }
  aResult.mTopSpecified = present;

  // Parse size spec, if any. Chrome size overrides content size.
  if ((temp = WinHasOption(aFeatures, "outerWidth", INT32_MIN, nullptr))) {
    if (temp == INT32_MIN) {
      aResult.mUseDefaultWidth = true;
    } else {
      aResult.mOuterWidth = temp;
    }
    aResult.mOuterWidthSpecified = true;
  } else if ((temp = WinHasOption(aFeatures, "width", INT32_MIN, nullptr)) ||
             (temp = WinHasOption(aFeatures, "innerWidth", INT32_MIN,
                                  nullptr))) {
    if (temp == INT32_MIN) {
      aResult.mUseDefaultWidth = true;
    } else {
      aResult.mInnerWidth = temp;
    }
    aResult.mInnerWidthSpecified = true;
  }

  if ((temp = WinHasOption(aFeatures, "outerHeight", INT32_MIN, nullptr))) {
    if (temp == INT32_MIN) {
      aResult.mUseDefaultHeight = true;
    } else {
      aResult.mOuterHeight = temp;
    }
    aResult.mOuterHeightSpecified = true;
  } else if ((temp = WinHasOption(aFeatures, "height", INT32_MIN,
                                  nullptr)) ||
             (temp = WinHasOption(aFeatures, "innerHeight", INT32_MIN,
                                  nullptr))) {
    if (temp == INT32_MIN) {
      aResult.mUseDefaultHeight = true;
    } else {
      aResult.mInnerHeight = temp;
    }
    aResult.mInnerHeightSpecified = true;
  }
}

/* Size and position a new window according to aSizeSpec. This method
   is assumed to be called after the window has already been given
   a default position and size; thus its current position and size are
   accurate defaults. The new window is made visible at method end.
   @param aTreeOwner
          The top-level nsIDocShellTreeOwner of the newly opened window.
   @param aParent (optional)
          The parent window from which to inherit zoom factors from if
          aOpenerFullZoom is none.
   @param aIsCallerChrome
          True if the code requesting the new window is privileged.
   @param aSizeSpec
          The size that the new window should be.
   @param aOpenerFullZoom
          If not nothing, a zoom factor to scale the content to.
*/
void
nsWindowWatcher::SizeOpenedWindow(nsIDocShellTreeOwner* aTreeOwner,
                                  mozIDOMWindowProxy* aParent,
                                  bool aIsCallerChrome,
                                  const SizeSpec& aSizeSpec,
                                  Maybe<float> aOpenerFullZoom)
{
  // We should only be sizing top-level windows if we're in the parent
  // process.
  MOZ_ASSERT(XRE_IsParentProcess());

  // position and size of window
  int32_t left = 0, top = 0, width = 100, height = 100;
  // difference between chrome and content size
  int32_t chromeWidth = 0, chromeHeight = 0;
  // whether the window size spec refers to chrome or content
  bool sizeChromeWidth = true, sizeChromeHeight = true;

  // get various interfaces for aDocShellItem, used throughout this method
  nsCOMPtr<nsIBaseWindow> treeOwnerAsWin(do_QueryInterface(aTreeOwner));
  if (!treeOwnerAsWin) { // we'll need this to actually size the docshell
    return;
  }

  double openerZoom = aOpenerFullZoom.valueOr(1.0);
  if (aParent && aOpenerFullZoom.isNothing()) {
    nsCOMPtr<nsPIDOMWindowOuter> piWindow = nsPIDOMWindowOuter::From(aParent);
    if (nsIDocument* doc = piWindow->GetDoc()) {
      if (nsIPresShell* shell = doc->GetShell()) {
        if (nsPresContext* presContext = shell->GetPresContext()) {
          openerZoom = presContext->GetFullZoom();
        }
      }
    }
  }

  double scale = 1.0;
  treeOwnerAsWin->GetUnscaledDevicePixelsPerCSSPixel(&scale);

  /* The current position and size will be unchanged if not specified
     (and they fit entirely onscreen). Also, calculate the difference
     between chrome and content sizes on aDocShellItem's window.
     This latter point becomes important if chrome and content
     specifications are mixed in aFeatures, and when bringing the window
     back from too far off the right or bottom edges of the screen. */

  treeOwnerAsWin->GetPositionAndSize(&left, &top, &width, &height);
  left = NSToIntRound(left / scale);
  top = NSToIntRound(top / scale);
  width = NSToIntRound(width / scale);
  height = NSToIntRound(height / scale);
  {
    int32_t contentWidth, contentHeight;
    bool hasPrimaryContent = false;
    aTreeOwner->GetHasPrimaryContent(&hasPrimaryContent);
    if (hasPrimaryContent) {
      aTreeOwner->GetPrimaryContentSize(&contentWidth, &contentHeight);
    } else {
      aTreeOwner->GetRootShellSize(&contentWidth, &contentHeight);
    }
    chromeWidth = width - contentWidth;
    chromeHeight = height - contentHeight;
  }

  // Set up left/top
  if (aSizeSpec.mLeftSpecified) {
    left = NSToIntRound(aSizeSpec.mLeft * openerZoom);
  }

  if (aSizeSpec.mTopSpecified) {
    top = NSToIntRound(aSizeSpec.mTop * openerZoom);
  }

  // Set up width
  if (aSizeSpec.mOuterWidthSpecified) {
    if (!aSizeSpec.mUseDefaultWidth) {
      width = NSToIntRound(aSizeSpec.mOuterWidth * openerZoom);
    } // Else specified to default; just use our existing width
  } else if (aSizeSpec.mInnerWidthSpecified) {
    sizeChromeWidth = false;
    if (aSizeSpec.mUseDefaultWidth) {
      width = width - chromeWidth;
    } else {
      width = NSToIntRound(aSizeSpec.mInnerWidth * openerZoom);
    }
  }

  // Set up height
  if (aSizeSpec.mOuterHeightSpecified) {
    if (!aSizeSpec.mUseDefaultHeight) {
      height = NSToIntRound(aSizeSpec.mOuterHeight * openerZoom);
    } // Else specified to default; just use our existing height
  } else if (aSizeSpec.mInnerHeightSpecified) {
    sizeChromeHeight = false;
    if (aSizeSpec.mUseDefaultHeight) {
      height = height - chromeHeight;
    } else {
      height = NSToIntRound(aSizeSpec.mInnerHeight * openerZoom);
    }
  }

  bool positionSpecified = aSizeSpec.PositionSpecified();

  // Check security state for use in determing window dimensions
  bool enabled = false;
  if (aIsCallerChrome) {
    // Only enable special priveleges for chrome when chrome calls
    // open() on a chrome window
    nsCOMPtr<nsIDOMChromeWindow> chromeWin(do_QueryInterface(aParent));
    enabled = !aParent || chromeWin;
  }

  if (!enabled) {
    // Security check failed.  Ensure all args meet minimum reqs.

    int32_t oldTop = top, oldLeft = left;

    // We'll also need the screen dimensions
    nsCOMPtr<nsIScreen> screen;
    nsCOMPtr<nsIScreenManager> screenMgr(
      do_GetService("@mozilla.org/gfx/screenmanager;1"));
    if (screenMgr)
      screenMgr->ScreenForRect(left, top, width, height,
                               getter_AddRefs(screen));
    if (screen) {
      int32_t screenLeft, screenTop, screenWidth, screenHeight;
      int32_t winWidth = width + (sizeChromeWidth ? 0 : chromeWidth),
              winHeight = height + (sizeChromeHeight ? 0 : chromeHeight);

      // Get screen dimensions (in device pixels)
      screen->GetAvailRect(&screenLeft, &screenTop, &screenWidth,
                           &screenHeight);
      // Convert them to CSS pixels
      screenLeft = NSToIntRound(screenLeft / scale);
      screenTop = NSToIntRound(screenTop / scale);
      screenWidth = NSToIntRound(screenWidth / scale);
      screenHeight = NSToIntRound(screenHeight / scale);

      if (aSizeSpec.SizeSpecified()) {
        /* Unlike position, force size out-of-bounds check only if
           size actually was specified. Otherwise, intrinsically sized
           windows are broken. */
        if (height < 100) {
          height = 100;
          winHeight = height + (sizeChromeHeight ? 0 : chromeHeight);
        }
        if (winHeight > screenHeight) {
          height = screenHeight - (sizeChromeHeight ? 0 : chromeHeight);
        }
        if (width < 100) {
          width = 100;
          winWidth = width + (sizeChromeWidth ? 0 : chromeWidth);
        }
        if (winWidth > screenWidth) {
          width = screenWidth - (sizeChromeWidth ? 0 : chromeWidth);
        }
      }

      if (left + winWidth > screenLeft + screenWidth ||
          left + winWidth < left) {
        left = screenLeft + screenWidth - winWidth;
      }
      if (left < screenLeft) {
        left = screenLeft;
      }
      if (top + winHeight > screenTop + screenHeight || top + winHeight < top) {
        top = screenTop + screenHeight - winHeight;
      }
      if (top < screenTop) {
        top = screenTop;
      }
      if (top != oldTop || left != oldLeft) {
        positionSpecified = true;
      }
    }
  }

  // size and position the window

  if (positionSpecified) {
    // Get the scale factor appropriate for the screen we're actually
    // positioning on.
    nsCOMPtr<nsIScreen> screen;
    nsCOMPtr<nsIScreenManager> screenMgr(
      do_GetService("@mozilla.org/gfx/screenmanager;1"));
    if (screenMgr) {
      screenMgr->ScreenForRect(left, top, 1, 1, getter_AddRefs(screen));
    }
    if (screen) {
      double cssToDevPixScale, desktopToDevPixScale;
      screen->GetDefaultCSSScaleFactor(&cssToDevPixScale);
      screen->GetContentsScaleFactor(&desktopToDevPixScale);
      double cssToDesktopScale = cssToDevPixScale / desktopToDevPixScale;
      int32_t screenLeft, screenTop, screenWd, screenHt;
      screen->GetRectDisplayPix(&screenLeft, &screenTop, &screenWd, &screenHt);
      // Adjust by desktop-pixel origin of the target screen when scaling
      // to convert from per-screen CSS-px coords to global desktop coords.
      treeOwnerAsWin->SetPositionDesktopPix(
        (left - screenLeft) * cssToDesktopScale + screenLeft,
        (top - screenTop) * cssToDesktopScale + screenTop);
    } else {
      // Couldn't find screen? This shouldn't happen.
      treeOwnerAsWin->SetPosition(left * scale, top * scale);
    }
    // This shouldn't be necessary, given the screen check above, but in case
    // moving the window didn't put it where we expected (e.g. due to issues
    // at the widget level, or whatever), let's re-fetch the scale factor for
    // wherever it really ended up
    treeOwnerAsWin->GetUnscaledDevicePixelsPerCSSPixel(&scale);
  }
  if (aSizeSpec.SizeSpecified()) {
    /* Prefer to trust the interfaces, which think in terms of pure
       chrome or content sizes. If we have a mix, use the chrome size
       adjusted by the chrome/content differences calculated earlier. */
    if (!sizeChromeWidth && !sizeChromeHeight) {
      bool hasPrimaryContent = false;
      aTreeOwner->GetHasPrimaryContent(&hasPrimaryContent);
      if (hasPrimaryContent) {
        aTreeOwner->SetPrimaryContentSize(width * scale, height * scale);
      } else {
        aTreeOwner->SetRootShellSize(width * scale, height * scale);
      }
    } else {
      if (!sizeChromeWidth) {
        width += chromeWidth;
      }
      if (!sizeChromeHeight) {
        height += chromeHeight;
      }
      treeOwnerAsWin->SetSize(width * scale, height * scale, false);
    }
  }
  treeOwnerAsWin->SetVisibility(true);
}

void
nsWindowWatcher::GetWindowTreeItem(mozIDOMWindowProxy* aWindow,
                                   nsIDocShellTreeItem** aResult)
{
  *aResult = 0;

  if (aWindow) {
    nsIDocShell* docshell = nsPIDOMWindowOuter::From(aWindow)->GetDocShell();
    if (docshell) {
      CallQueryInterface(docshell, aResult);
    }
  }
}

void
nsWindowWatcher::GetWindowTreeOwner(nsPIDOMWindowOuter* aWindow,
                                    nsIDocShellTreeOwner** aResult)
{
  *aResult = 0;

  nsCOMPtr<nsIDocShellTreeItem> treeItem;
  GetWindowTreeItem(aWindow, getter_AddRefs(treeItem));
  if (treeItem) {
    treeItem->GetTreeOwner(aResult);
  }
}

/* static */
int32_t
nsWindowWatcher::GetWindowOpenLocation(nsPIDOMWindowOuter* aParent,
                                       uint32_t aChromeFlags,
                                       bool aCalledFromJS,
                                       bool aPositionSpecified,
                                       bool aSizeSpecified)
{
  bool isFullScreen = aParent->GetFullScreen();

  // Where should we open this?
  int32_t containerPref;
  if (NS_FAILED(Preferences::GetInt("browser.link.open_newwindow",
                                    &containerPref))) {
    // We couldn't read the user preference, so fall back on the default.
    return nsIBrowserDOMWindow::OPEN_NEWTAB;
  }

  bool isDisabledOpenNewWindow =
    isFullScreen &&
    Preferences::GetBool("browser.link.open_newwindow.disabled_in_fullscreen");

  if (isDisabledOpenNewWindow &&
      (containerPref == nsIBrowserDOMWindow::OPEN_NEWWINDOW)) {
    containerPref = nsIBrowserDOMWindow::OPEN_NEWTAB;
  }

  if (containerPref != nsIBrowserDOMWindow::OPEN_NEWTAB &&
      containerPref != nsIBrowserDOMWindow::OPEN_CURRENTWINDOW) {
    // Just open a window normally
    return nsIBrowserDOMWindow::OPEN_NEWWINDOW;
  }

  if (aCalledFromJS) {
    /* Now check our restriction pref.  The restriction pref is a power-user's
       fine-tuning pref. values:
       0: no restrictions - divert everything
       1: don't divert window.open at all
       2: don't divert window.open with features
    */
    int32_t restrictionPref =
      Preferences::GetInt("browser.link.open_newwindow.restriction", 2);
    if (restrictionPref < 0 || restrictionPref > 2) {
      restrictionPref = 2; // Sane default behavior
    }

    if (isDisabledOpenNewWindow) {
      // In browser fullscreen, the window should be opened
      // in the current window with no features (see bug 803675)
      restrictionPref = 0;
    }

    if (restrictionPref == 1) {
      return nsIBrowserDOMWindow::OPEN_NEWWINDOW;
    }

    if (restrictionPref == 2) {
      // Only continue if there are no size/position features and no special
      // chrome flags - with the exception of the remoteness and private flags,
      // which might have been automatically flipped by Gecko.
      int32_t uiChromeFlags = aChromeFlags;
      uiChromeFlags &= ~(nsIWebBrowserChrome::CHROME_REMOTE_WINDOW |
                         nsIWebBrowserChrome::CHROME_PRIVATE_WINDOW |
                         nsIWebBrowserChrome::CHROME_NON_PRIVATE_WINDOW |
                         nsIWebBrowserChrome::CHROME_PRIVATE_LIFETIME);
      if (uiChromeFlags != nsIWebBrowserChrome::CHROME_ALL ||
          aPositionSpecified || aSizeSpecified) {
        return nsIBrowserDOMWindow::OPEN_NEWWINDOW;
      }
    }
  }

  return containerPref;
}