/* -*- 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 "nsGenericHTMLFrameElement.h"

#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/HTMLIFrameElement.h"
#include "mozilla/Preferences.h"
#include "mozilla/ErrorResult.h"
#include "GeckoProfiler.h"
#include "nsAttrValueInlines.h"
#include "nsContentUtils.h"
#include "nsIDocShell.h"
#include "nsIDOMDocument.h"
#include "nsIFrame.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPermissionManager.h"
#include "nsIPresShell.h"
#include "nsIScrollable.h"
#include "nsPresContext.h"
#include "nsServiceManagerUtils.h"
#include "nsSubDocumentFrame.h"
#include "nsXULElement.h"
#include "nsAttrValueOrString.h"

using namespace mozilla;
using namespace mozilla::dom;

NS_IMPL_CYCLE_COLLECTION_CLASS(nsGenericHTMLFrameElement)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsGenericHTMLFrameElement,
                                                  nsGenericHTMLElement)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFrameLoader)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOpenerWindow)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBrowserElementAPI)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(nsGenericHTMLFrameElement,
                                                nsGenericHTMLElement)
  if (tmp->mFrameLoader) {
    tmp->mFrameLoader->Destroy();
  }

  NS_IMPL_CYCLE_COLLECTION_UNLINK(mFrameLoader)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOpenerWindow)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBrowserElementAPI)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(nsGenericHTMLFrameElement,
                                             nsGenericHTMLElement,
                                             nsIFrameLoaderOwner,
                                             nsIDOMMozBrowserFrame,
                                             nsIMozBrowserFrame,
                                             nsGenericHTMLFrameElement)

NS_IMPL_BOOL_ATTR(nsGenericHTMLFrameElement, Mozbrowser, mozbrowser)

int32_t
nsGenericHTMLFrameElement::TabIndexDefault()
{
  return 0;
}

nsGenericHTMLFrameElement::~nsGenericHTMLFrameElement()
{
  if (mFrameLoader) {
    mFrameLoader->Destroy();
  }
}

nsresult
nsGenericHTMLFrameElement::GetContentDocument(nsIDOMDocument** aContentDocument)
{
  NS_PRECONDITION(aContentDocument, "Null out param");
  nsCOMPtr<nsIDOMDocument> document =
    do_QueryInterface(GetContentDocument(*nsContentUtils::SubjectPrincipal()));
  document.forget(aContentDocument);
  return NS_OK;
}

nsIDocument*
nsGenericHTMLFrameElement::GetContentDocument(nsIPrincipal& aSubjectPrincipal)
{
  nsCOMPtr<nsPIDOMWindowOuter> win = GetContentWindow();
  if (!win) {
    return nullptr;
  }

  nsIDocument *doc = win->GetDoc();
  if (!doc) {
    return nullptr;
  }

  // Return null for cross-origin contentDocument.
  if (!aSubjectPrincipal.SubsumesConsideringDomain(doc->NodePrincipal())) {
    return nullptr;
  }
  return doc;
}

already_AddRefed<nsPIDOMWindowOuter>
nsGenericHTMLFrameElement::GetContentWindow()
{
  EnsureFrameLoader();

  if (!mFrameLoader) {
    return nullptr;
  }

  bool depthTooGreat = false;
  mFrameLoader->GetDepthTooGreat(&depthTooGreat);
  if (depthTooGreat) {
    // Claim to have no contentWindow
    return nullptr;
  }

  nsCOMPtr<nsIDocShell> doc_shell;
  mFrameLoader->GetDocShell(getter_AddRefs(doc_shell));
  if (!doc_shell) {
    return nullptr;
  }

  nsCOMPtr<nsPIDOMWindowOuter> win = doc_shell->GetWindow();

  if (!win) {
    return nullptr;
  }

  NS_ASSERTION(win->IsOuterWindow(),
               "Uh, this window should always be an outer window!");

  return win.forget();
}

void
nsGenericHTMLFrameElement::EnsureFrameLoader()
{
  if (!IsInComposedDoc() || mFrameLoader || mFrameLoaderCreationDisallowed) {
    // If frame loader is there, we just keep it around, cached
    return;
  }

  // Strangely enough, this method doesn't actually ensure that the
  // frameloader exists.  It's more of a best-effort kind of thing.
  mFrameLoader = nsFrameLoader::Create(this,
                                       nsPIDOMWindowOuter::From(mOpenerWindow),
                                       mNetworkCreated);
  if (mIsPrerendered) {
    mFrameLoader->SetIsPrerendered();
  }
}

nsresult
nsGenericHTMLFrameElement::CreateRemoteFrameLoader(nsITabParent* aTabParent)
{
  MOZ_ASSERT(!mFrameLoader);
  EnsureFrameLoader();
  NS_ENSURE_STATE(mFrameLoader);
  mFrameLoader->SetRemoteBrowser(aTabParent);

  if (nsSubDocumentFrame* subdocFrame = do_QueryFrame(GetPrimaryFrame())) {
    // The reflow for this element already happened while we were waiting
    // for the iframe creation. Therefore the subdoc frame didn't have a
    // frameloader when UpdatePositionAndSize was supposed to be called in
    // ReflowFinished, and we need to do it properly now.
    mFrameLoader->UpdatePositionAndSize(subdocFrame);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::GetFrameLoaderXPCOM(nsIFrameLoader **aFrameLoader)
{
  NS_IF_ADDREF(*aFrameLoader = mFrameLoader);
  return NS_OK;
}

NS_IMETHODIMP_(already_AddRefed<nsFrameLoader>)
nsGenericHTMLFrameElement::GetFrameLoader()
{
  RefPtr<nsFrameLoader> loader = mFrameLoader;
  return loader.forget();
}

void
nsGenericHTMLFrameElement::PresetOpenerWindow(mozIDOMWindowProxy* aWindow, ErrorResult& aRv)
{
  MOZ_ASSERT(!mFrameLoader);
  mOpenerWindow = nsPIDOMWindowOuter::From(aWindow);
}

void
nsGenericHTMLFrameElement::InternalSetFrameLoader(nsIFrameLoader* aNewFrameLoader)
{
  mFrameLoader = static_cast<nsFrameLoader*>(aNewFrameLoader);
}

void
nsGenericHTMLFrameElement::SwapFrameLoaders(HTMLIFrameElement& aOtherLoaderOwner,
                                            ErrorResult& rv)
{
  if (&aOtherLoaderOwner == this) {
    // nothing to do
    return;
  }

  aOtherLoaderOwner.SwapFrameLoaders(this, rv);
}

void
nsGenericHTMLFrameElement::SwapFrameLoaders(nsXULElement& aOtherLoaderOwner,
                                            ErrorResult& rv)
{
  aOtherLoaderOwner.SwapFrameLoaders(this, rv);
}

void
nsGenericHTMLFrameElement::SwapFrameLoaders(nsIFrameLoaderOwner* aOtherLoaderOwner,
                                            mozilla::ErrorResult& rv)
{
  RefPtr<nsFrameLoader> loader = GetFrameLoader();
  RefPtr<nsFrameLoader> otherLoader = aOtherLoaderOwner->GetFrameLoader();
  if (!loader || !otherLoader) {
    rv.Throw(NS_ERROR_NOT_IMPLEMENTED);
    return;
  }

  rv = loader->SwapWithOtherLoader(otherLoader, this, aOtherLoaderOwner);
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::SetIsPrerendered()
{
  MOZ_ASSERT(!mFrameLoader, "Please call SetIsPrerendered before frameLoader is created");
  mIsPrerendered = true;
  return NS_OK;
}

nsresult
nsGenericHTMLFrameElement::LoadSrc()
{
  EnsureFrameLoader();

  if (!mFrameLoader) {
    return NS_OK;
  }

  bool origSrc = !mSrcLoadHappened;
  mSrcLoadHappened = true;
  nsresult rv = mFrameLoader->LoadFrame(origSrc);
#ifdef DEBUG
  if (NS_FAILED(rv)) {
    NS_WARNING("failed to load URL");
  }
#endif

  return rv;
}

nsresult
nsGenericHTMLFrameElement::BindToTree(nsIDocument* aDocument,
                                      nsIContent* aParent,
                                      nsIContent* aBindingParent,
                                      bool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
                                                 aBindingParent,
                                                 aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  if (IsInComposedDoc()) {
    NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
                 "Missing a script blocker!");

    AUTO_PROFILER_LABEL("nsGenericHTMLFrameElement::BindToTree", OTHER);

    // We're in a document now.  Kick off the frame load.
    LoadSrc();
  }

  // We're now in document and scripts may move us, so clear
  // the mNetworkCreated flag.
  mNetworkCreated = false;
  return rv;
}

void
nsGenericHTMLFrameElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
  if (mFrameLoader) {
    // This iframe is being taken out of the document, destroy the
    // iframe's frame loader (doing that will tear down the window in
    // this iframe).
    // XXXbz we really want to only partially destroy the frame
    // loader... we don't want to tear down the docshell.  Food for
    // later bug.
    mFrameLoader->Destroy();
    mFrameLoader = nullptr;
  }

  nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
}

/* static */ int32_t
nsGenericHTMLFrameElement::MapScrollingAttribute(const nsAttrValue* aValue)
{
  int32_t mappedValue = nsIScrollable::Scrollbar_Auto;
  if (aValue && aValue->Type() == nsAttrValue::eEnum) {
    switch (aValue->GetEnumValue()) {
      case NS_STYLE_FRAME_OFF:
      case NS_STYLE_FRAME_NOSCROLL:
      case NS_STYLE_FRAME_NO:
        mappedValue = nsIScrollable::Scrollbar_Never;
        break;
    }
  }
  return mappedValue;
}

static bool
PrincipalAllowsBrowserFrame(nsIPrincipal* aPrincipal)
{
  nsCOMPtr<nsIPermissionManager> permMgr = mozilla::services::GetPermissionManager();
  NS_ENSURE_TRUE(permMgr, false);
  uint32_t permission = nsIPermissionManager::DENY_ACTION;
  nsresult rv = permMgr->TestPermissionFromPrincipal(aPrincipal, "browser", &permission);
  NS_ENSURE_SUCCESS(rv, false);
  return permission == nsIPermissionManager::ALLOW_ACTION;
}

/* virtual */ nsresult
nsGenericHTMLFrameElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                        const nsAttrValue* aValue,
                                        const nsAttrValue* aOldValue,
                                        nsIPrincipal* aMaybeScriptedPrincipal,
                                        bool aNotify)
{
  if (aValue) {
    nsAttrValueOrString value(aValue);
    AfterMaybeChangeAttr(aNameSpaceID, aName, &value, aMaybeScriptedPrincipal, aNotify);
  } else {
    AfterMaybeChangeAttr(aNameSpaceID, aName, nullptr, aMaybeScriptedPrincipal, aNotify);
  }

  if (aNameSpaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::scrolling) {
      if (mFrameLoader) {
        nsIDocShell* docshell = mFrameLoader->GetExistingDocShell();
        nsCOMPtr<nsIScrollable> scrollable = do_QueryInterface(docshell);
        if (scrollable) {
          int32_t cur;
          scrollable->GetDefaultScrollbarPreferences(nsIScrollable::ScrollOrientation_X, &cur);
          int32_t val = MapScrollingAttribute(aValue);
          if (cur != val) {
            scrollable->SetDefaultScrollbarPreferences(nsIScrollable::ScrollOrientation_X, val);
            scrollable->SetDefaultScrollbarPreferences(nsIScrollable::ScrollOrientation_Y, val);
            RefPtr<nsPresContext> presContext;
            docshell->GetPresContext(getter_AddRefs(presContext));
            nsIPresShell* shell = presContext ? presContext->GetPresShell() : nullptr;
            nsIFrame* rootScroll = shell ? shell->GetRootScrollFrame() : nullptr;
            if (rootScroll) {
              shell->FrameNeedsReflow(rootScroll, nsIPresShell::eStyleChange,
                                      NS_FRAME_IS_DIRTY);
            }
          }
        }
      }
    } else if (aName == nsGkAtoms::mozbrowser) {
      mReallyIsBrowser = !!aValue && BrowserFramesEnabled() &&
                         PrincipalAllowsBrowserFrame(NodePrincipal());
    }
  }

  return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue,
                                            aOldValue, aMaybeScriptedPrincipal, aNotify);
}

nsresult
nsGenericHTMLFrameElement::OnAttrSetButNotChanged(int32_t aNamespaceID,
                                                  nsAtom* aName,
                                                  const nsAttrValueOrString& aValue,
                                                  bool aNotify)
{
  AfterMaybeChangeAttr(aNamespaceID, aName, &aValue, nullptr, aNotify);

  return nsGenericHTMLElement::OnAttrSetButNotChanged(aNamespaceID, aName,
                                                      aValue, aNotify);
}

void
nsGenericHTMLFrameElement::AfterMaybeChangeAttr(int32_t aNamespaceID,
                                                nsAtom* aName,
                                                const nsAttrValueOrString* aValue,
                                                nsIPrincipal* aMaybeScriptedPrincipal,
                                                bool aNotify)
{
  if (aNamespaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::src) {
      mSrcTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
          this, aValue ? aValue->String() : EmptyString(), aMaybeScriptedPrincipal);
      if (aValue && (!IsHTMLElement(nsGkAtoms::iframe) ||
          !HasAttr(kNameSpaceID_None, nsGkAtoms::srcdoc))) {
        // Don't propagate error here. The attribute was successfully set,
        // that's what we should reflect.
        LoadSrc();
      }
    } else if (aName == nsGkAtoms::name) {
      // Propagate "name" to the docshell to make browsing context names live,
      // per HTML5.
      nsIDocShell* docShell = mFrameLoader ? mFrameLoader->GetExistingDocShell()
                                           : nullptr;
      if (docShell) {
        if (aValue) {
          docShell->SetName(aValue->String());
        } else {
          docShell->SetName(EmptyString());
        }
      }
    }
  }
}

void
nsGenericHTMLFrameElement::DestroyContent()
{
  if (mFrameLoader) {
    mFrameLoader->Destroy();
    mFrameLoader = nullptr;
  }

  nsGenericHTMLElement::DestroyContent();
}

nsresult
nsGenericHTMLFrameElement::CopyInnerTo(Element* aDest,
                                       bool aPreallocateChildren)
{
  nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest, aPreallocateChildren);
  NS_ENSURE_SUCCESS(rv, rv);

  nsIDocument* doc = aDest->OwnerDoc();
  if (doc->IsStaticDocument() && mFrameLoader) {
    nsGenericHTMLFrameElement* dest =
      static_cast<nsGenericHTMLFrameElement*>(aDest);
    nsFrameLoader* fl = nsFrameLoader::Create(dest, nullptr, false);
    NS_ENSURE_STATE(fl);
    dest->mFrameLoader = fl;
    static_cast<nsFrameLoader*>(mFrameLoader.get())->CreateStaticClone(fl);
  }

  return rv;
}

bool
nsGenericHTMLFrameElement::IsHTMLFocusable(bool aWithMouse,
                                           bool *aIsFocusable,
                                           int32_t *aTabIndex)
{
  if (nsGenericHTMLElement::IsHTMLFocusable(aWithMouse, aIsFocusable, aTabIndex)) {
    return true;
  }

  *aIsFocusable = nsContentUtils::IsSubDocumentTabbable(this);

  if (!*aIsFocusable && aTabIndex) {
    *aTabIndex = -1;
  }

  return false;
}

static bool sMozBrowserFramesEnabled = false;
#ifdef DEBUG
static bool sBoolVarCacheInitialized = false;
#endif

void
nsGenericHTMLFrameElement::InitStatics()
{
  MOZ_ASSERT(!sBoolVarCacheInitialized);
  MOZ_ASSERT(NS_IsMainThread());
  Preferences::AddBoolVarCache(&sMozBrowserFramesEnabled,
                               "dom.mozBrowserFramesEnabled");
#ifdef DEBUG
  sBoolVarCacheInitialized = true;
#endif
}


bool
nsGenericHTMLFrameElement::BrowserFramesEnabled()
{
  MOZ_ASSERT(sBoolVarCacheInitialized);
  return sMozBrowserFramesEnabled;
}

/**
 * Return true if this frame element really is a mozbrowser.  (It
 * needs to have the right attributes, and its creator must have the right
 * permissions.)
 */
/* [infallible] */ nsresult
nsGenericHTMLFrameElement::GetReallyIsBrowser(bool *aOut)
{
  *aOut = mReallyIsBrowser;
  return NS_OK;
}

/* [infallible] */ NS_IMETHODIMP
nsGenericHTMLFrameElement::GetIsolated(bool *aOut)
{
  *aOut = true;

  if (!nsContentUtils::IsSystemPrincipal(NodePrincipal())) {
    return NS_OK;
  }

  // Isolation is only disabled if the attribute is present
  *aOut = !HasAttr(kNameSpaceID_None, nsGkAtoms::noisolation);
  return NS_OK;
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::DisallowCreateFrameLoader()
{
  MOZ_ASSERT(!mFrameLoader);
  MOZ_ASSERT(!mFrameLoaderCreationDisallowed);
  mFrameLoaderCreationDisallowed = true;
  return NS_OK;
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::AllowCreateFrameLoader()
{
  MOZ_ASSERT(!mFrameLoader);
  MOZ_ASSERT(mFrameLoaderCreationDisallowed);
  mFrameLoaderCreationDisallowed = false;
  return NS_OK;
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::InitializeBrowserAPI()
{
  MOZ_ASSERT(mFrameLoader);
  InitBrowserElementAPI();
  return NS_OK;
}

NS_IMETHODIMP
nsGenericHTMLFrameElement::DestroyBrowserFrameScripts()
{
  MOZ_ASSERT(mFrameLoader);
  DestroyBrowserElementFrameScripts();
  return NS_OK;
}
