/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/DebugOnly.h"

#include "mozilla/Logging.h"
#include "nscore.h"
#include "prenv.h"

#include "nsNPAPIPluginInstance.h"
#include "nsNPAPIPlugin.h"
#include "nsNPAPIPluginStreamListener.h"
#include "nsPluginHost.h"
#include "nsPluginLogging.h"
#include "nsContentUtils.h"
#include "nsPluginInstanceOwner.h"

#include "nsThreadUtils.h"
#include "mozilla/dom/Document.h"
#include "nsIDocShell.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptContext.h"
#include "nsDirectoryServiceDefs.h"
#include "nsJSNPRuntime.h"
#include "nsPluginStreamListenerPeer.h"
#include "nsSize.h"
#include "nsNetCID.h"
#include "nsIContent.h"
#include "nsVersionComparator.h"
#include "mozilla/Preferences.h"
#include "mozilla/Unused.h"
#include "nsILoadContext.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLObjectElementBinding.h"
#include "AudioChannelService.h"
#include "GeckoProfiler.h"

using namespace mozilla;
using namespace mozilla::dom;

using namespace mozilla;
using namespace mozilla::plugins::parent;
using namespace mozilla::layers;

NS_IMPL_ISUPPORTS(nsNPAPIPluginInstance, nsIAudioChannelAgentCallback)

nsNPAPIPluginInstance::nsNPAPIPluginInstance()
    : mDrawingModel(kDefaultDrawingModel),
      mRunning(NOT_STARTED),
      mWindowless(false),
      mTransparent(false),
      mCached(false),
      mUsesDOMForCursor(false),
      mInPluginInitCall(false),
      mPlugin(nullptr),
      mMIMEType(nullptr),
      mOwner(nullptr)
#ifdef XP_MACOSX
      ,
      mCurrentPluginEvent(nullptr)
#endif
      ,
      mCachedParamLength(0),
      mCachedParamNames(nullptr),
      mCachedParamValues(nullptr) {
  mNPP.pdata = nullptr;
  mNPP.ndata = this;

  PLUGIN_LOG(PLUGIN_LOG_BASIC, ("nsNPAPIPluginInstance ctor: this=%p\n", this));
}

nsNPAPIPluginInstance::~nsNPAPIPluginInstance() {
  PLUGIN_LOG(PLUGIN_LOG_BASIC, ("nsNPAPIPluginInstance dtor: this=%p\n", this));

  if (mMIMEType) {
    free(mMIMEType);
    mMIMEType = nullptr;
  }

  if (!mCachedParamValues || !mCachedParamNames) {
    return;
  }
  MOZ_ASSERT(mCachedParamValues && mCachedParamNames);

  for (uint32_t i = 0; i < mCachedParamLength; i++) {
    if (mCachedParamNames[i]) {
      free(mCachedParamNames[i]);
      mCachedParamNames[i] = nullptr;
    }
    if (mCachedParamValues[i]) {
      free(mCachedParamValues[i]);
      mCachedParamValues[i] = nullptr;
    }
  }

  free(mCachedParamNames);
  mCachedParamNames = nullptr;

  free(mCachedParamValues);
  mCachedParamValues = nullptr;
}

uint32_t nsNPAPIPluginInstance::gInUnsafePluginCalls = 0;

void nsNPAPIPluginInstance::Destroy() {
  Stop();
  mPlugin = nullptr;
  mAudioChannelAgent = nullptr;
}

TimeStamp nsNPAPIPluginInstance::StopTime() { return mStopTime; }

nsresult nsNPAPIPluginInstance::Initialize(nsNPAPIPlugin* aPlugin,
                                           nsPluginInstanceOwner* aOwner,
                                           const nsACString& aMIMEType) {
  AUTO_PROFILER_LABEL("nsNPAPIPlugin::Initialize", OTHER);
  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
             ("nsNPAPIPluginInstance::Initialize this=%p\n", this));

  NS_ENSURE_ARG_POINTER(aPlugin);
  NS_ENSURE_ARG_POINTER(aOwner);

  mPlugin = aPlugin;
  mOwner = aOwner;

  if (!aMIMEType.IsEmpty()) {
    mMIMEType = ToNewCString(aMIMEType);
  }

  return Start();
}

nsresult nsNPAPIPluginInstance::Stop() {
  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
             ("nsNPAPIPluginInstance::Stop this=%p\n", this));

  // Make sure the plugin didn't leave popups enabled.
  if (mPopupStates.Length() > 0) {
    PopupBlocker::PopPopupControlState(PopupBlocker::openAbused);
  }

  if (RUNNING != mRunning) {
    return NS_OK;
  }

  // clean up all outstanding timers
  for (uint32_t i = mTimers.Length(); i > 0; i--)
    UnscheduleTimer(mTimers[i - 1]->id);

  // If there's code from this plugin instance on the stack, delay the
  // destroy.
  if (PluginDestructionGuard::DelayDestroy(this)) {
    return NS_OK;
  }

  mRunning = DESTROYING;
  mStopTime = TimeStamp::Now();

  // clean up open streams
  while (mStreamListeners.Length() > 0) {
    RefPtr<nsNPAPIPluginStreamListener> currentListener(mStreamListeners[0]);
    currentListener->CleanUpStream(NPRES_USER_BREAK);
    mStreamListeners.RemoveElement(currentListener);
  }

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  NPError error = NPERR_GENERIC_ERROR;
  if (pluginFunctions->destroy) {
    NPSavedData* sdata = 0;

    NS_TRY_SAFE_CALL_RETURN(error, (*pluginFunctions->destroy)(&mNPP, &sdata),
                            this, NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);

    NPP_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
                   ("NPP Destroy called: this=%p, npp=%p, return=%d\n", this,
                    &mNPP, error));
  }
  mRunning = DESTROYED;

  nsJSNPRuntime::OnPluginDestroy(&mNPP);

  if (error != NPERR_NO_ERROR)
    return NS_ERROR_FAILURE;
  else
    return NS_OK;
}

already_AddRefed<nsPIDOMWindowOuter> nsNPAPIPluginInstance::GetDOMWindow() {
  if (!mOwner) return nullptr;

  RefPtr<nsPluginInstanceOwner> kungFuDeathGrip(mOwner);

  nsCOMPtr<Document> doc;
  kungFuDeathGrip->GetDocument(getter_AddRefs(doc));
  if (!doc) return nullptr;

  RefPtr<nsPIDOMWindowOuter> window = doc->GetWindow();

  return window.forget();
}

nsresult nsNPAPIPluginInstance::GetTagType(nsPluginTagType* result) {
  if (!mOwner) {
    return NS_ERROR_FAILURE;
  }

  return mOwner->GetTagType(result);
}

nsTArray<nsNPAPIPluginStreamListener*>*
nsNPAPIPluginInstance::StreamListeners() {
  return &mStreamListeners;
}

nsTArray<nsPluginStreamListenerPeer*>*
nsNPAPIPluginInstance::FileCachedStreamListeners() {
  return &mFileCachedStreamListeners;
}

nsresult nsNPAPIPluginInstance::Start() {
  if (mRunning == RUNNING) {
    return NS_OK;
  }

  if (!mOwner) {
    MOZ_ASSERT(false, "Should not be calling Start() on unowned plugin.");
    return NS_ERROR_FAILURE;
  }

  PluginDestructionGuard guard(this);

  nsTArray<MozPluginParameter> attributes;
  nsTArray<MozPluginParameter> params;

  nsPluginTagType tagtype;
  nsresult rv = GetTagType(&tagtype);
  if (NS_SUCCEEDED(rv)) {
    mOwner->GetAttributes(attributes);
    mOwner->GetParameters(params);
  } else {
    MOZ_ASSERT(false, "Failed to get tag type.");
  }

  mCachedParamLength = attributes.Length() + 1 + params.Length();

  // We add an extra entry "PARAM" as a separator between the attribute
  // and param values, but we don't count it if there are no <param> entries.
  // Legacy behavior quirk.
  uint32_t quirkParamLength =
      params.Length() ? mCachedParamLength : attributes.Length();

  mCachedParamNames = (char**)moz_xmalloc(sizeof(char*) * mCachedParamLength);
  mCachedParamValues = (char**)moz_xmalloc(sizeof(char*) * mCachedParamLength);

  for (uint32_t i = 0; i < attributes.Length(); i++) {
    mCachedParamNames[i] = ToNewUTF8String(attributes[i].mName);
    mCachedParamValues[i] = ToNewUTF8String(attributes[i].mValue);
  }

  mCachedParamNames[attributes.Length()] = ToNewUTF8String(u"PARAM"_ns);
  mCachedParamValues[attributes.Length()] = nullptr;

  for (uint32_t i = 0, pos = attributes.Length() + 1; i < params.Length();
       i++) {
    mCachedParamNames[pos] = ToNewUTF8String(params[i].mName);
    mCachedParamValues[pos] = ToNewUTF8String(params[i].mValue);
    pos++;
  }

  const char* mimetype;
  NPError error = NPERR_GENERIC_ERROR;

  GetMIMEType(&mimetype);

  bool oldVal = mInPluginInitCall;
  mInPluginInitCall = true;

  // Need this on the stack before calling NPP_New otherwise some callbacks that
  // the plugin may make could fail (NPN_HasProperty, for example).
  NPPAutoPusher autopush(&mNPP);

  if (!mPlugin) return NS_ERROR_FAILURE;

  PluginLibrary* library = mPlugin->GetLibrary();
  if (!library) return NS_ERROR_FAILURE;

  // Mark this instance as running before calling NPP_New because the plugin may
  // call other NPAPI functions, like NPN_GetURLNotify, that assume this is set
  // before returning. If the plugin returns failure, we'll clear it out below.
  mRunning = RUNNING;

  nsresult newResult =
      library->NPP_New((char*)mimetype, &mNPP, quirkParamLength,
                       mCachedParamNames, mCachedParamValues, nullptr, &error);
  mInPluginInitCall = oldVal;

  NPP_PLUGIN_LOG(
      PLUGIN_LOG_NORMAL,
      ("NPP New called: this=%p, npp=%p, mime=%s, argc=%d, return=%d\n", this,
       &mNPP, mimetype, quirkParamLength, error));

  if (NS_FAILED(newResult) || error != NPERR_NO_ERROR) {
    mRunning = DESTROYED;
    nsJSNPRuntime::OnPluginDestroy(&mNPP);
    return NS_ERROR_FAILURE;
  }

  return newResult;
}

nsresult nsNPAPIPluginInstance::SetWindow(NPWindow* window) {
  // NPAPI plugins don't want a SetWindow(nullptr).
  if (!window || RUNNING != mRunning) return NS_OK;

#if MOZ_WIDGET_GTK
  // bug 108347, flash plugin on linux doesn't like window->width <= 0
  return NS_OK;
#endif

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  if (pluginFunctions->setwindow) {
    PluginDestructionGuard guard(this);

    // XXX Turns out that NPPluginWindow and NPWindow are structurally
    // identical (on purpose!), so there's no need to make a copy.

    PLUGIN_LOG(PLUGIN_LOG_NORMAL,
               ("nsNPAPIPluginInstance::SetWindow (about to call it) this=%p\n",
                this));

    bool oldVal = mInPluginInitCall;
    mInPluginInitCall = true;

    NPPAutoPusher nppPusher(&mNPP);

    NPError error;
    NS_TRY_SAFE_CALL_RETURN(
        error, (*pluginFunctions->setwindow)(&mNPP, (NPWindow*)window), this,
        NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
    // 'error' is only used if this is a logging-enabled build.
    // That is somewhat complex to check, so we just use "unused"
    // to suppress any compiler warnings in build configurations
    // where the logging is a no-op.
    mozilla::Unused << error;

    mInPluginInitCall = oldVal;

    NPP_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
                   ("NPP SetWindow called: this=%p, [x=%d,y=%d,w=%d,h=%d], "
                    "clip[t=%d,b=%d,l=%d,r=%d], return=%d\n",
                    this, window->x, window->y, window->width, window->height,
                    window->clipRect.top, window->clipRect.bottom,
                    window->clipRect.left, window->clipRect.right, error));
  }
  return NS_OK;
}

nsresult nsNPAPIPluginInstance::NewStreamListener(
    const char* aURL, void* notifyData,
    nsNPAPIPluginStreamListener** listener) {
  RefPtr<nsNPAPIPluginStreamListener> sl =
      new nsNPAPIPluginStreamListener(this, notifyData, aURL);

  mStreamListeners.AppendElement(sl);

  sl.forget(listener);

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::Print(NPPrint* platformPrint) {
  NS_ENSURE_TRUE(platformPrint, NS_ERROR_NULL_POINTER);

  PluginDestructionGuard guard(this);

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  NPPrint* thePrint = (NPPrint*)platformPrint;

  // to be compatible with the older SDK versions and to match what
  // NPAPI and other browsers do, overwrite |window.type| field with one
  // more copy of |platformPrint|. See bug 113264
  uint16_t sdkmajorversion = (pluginFunctions->version & 0xff00) >> 8;
  uint16_t sdkminorversion = pluginFunctions->version & 0x00ff;
  if ((sdkmajorversion == 0) && (sdkminorversion < 11)) {
    // Let's copy platformPrint bytes over to where it was supposed to be
    // in older versions -- four bytes towards the beginning of the struct
    // but we should be careful about possible misalignments
    if (sizeof(NPWindowType) >= sizeof(void*)) {
      void* source = thePrint->print.embedPrint.platformPrint;
      void** destination = (void**)&(thePrint->print.embedPrint.window.type);
      *destination = source;
    } else {
      NS_ERROR("Incompatible OS for assignment");
    }
  }

  if (pluginFunctions->print)
    NS_TRY_SAFE_CALL_VOID((*pluginFunctions->print)(&mNPP, thePrint), this,
                          NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);

  NPP_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
                 ("NPP PrintProc called: this=%p, pDC=%p, "
                  "[x=%d,y=%d,w=%d,h=%d], clip[t=%d,b=%d,l=%d,r=%d]\n",
                  this, platformPrint->print.embedPrint.platformPrint,
                  platformPrint->print.embedPrint.window.x,
                  platformPrint->print.embedPrint.window.y,
                  platformPrint->print.embedPrint.window.width,
                  platformPrint->print.embedPrint.window.height,
                  platformPrint->print.embedPrint.window.clipRect.top,
                  platformPrint->print.embedPrint.window.clipRect.bottom,
                  platformPrint->print.embedPrint.window.clipRect.left,
                  platformPrint->print.embedPrint.window.clipRect.right));

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::HandleEvent(
    void* event, int16_t* result, NSPluginCallReentry aSafeToReenterGecko) {
  if (RUNNING != mRunning) return NS_OK;

  AUTO_PROFILER_LABEL("nsNPAPIPluginInstance::HandleEvent", OTHER);

  if (!event) return NS_ERROR_FAILURE;

  PluginDestructionGuard guard(this);

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  int16_t tmpResult = kNPEventNotHandled;

  if (pluginFunctions->event) {
#ifdef XP_MACOSX
    mCurrentPluginEvent = event;
#endif
#if defined(XP_WIN)
    NS_TRY_SAFE_CALL_RETURN(tmpResult, (*pluginFunctions->event)(&mNPP, event),
                            this, aSafeToReenterGecko);
#else
    tmpResult = (*pluginFunctions->event)(&mNPP, event);
#endif
    NPP_PLUGIN_LOG(
        PLUGIN_LOG_NOISY,
        ("NPP HandleEvent called: this=%p, npp=%p, event=%p, return=%d\n", this,
         &mNPP, event, tmpResult));

    if (result) *result = tmpResult;
#ifdef XP_MACOSX
    mCurrentPluginEvent = nullptr;
#endif
  }

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::GetValueFromPlugin(NPPVariable variable,
                                                   void* value) {
  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  nsresult rv = NS_ERROR_FAILURE;

  if (pluginFunctions->getvalue && RUNNING == mRunning) {
    PluginDestructionGuard guard(this);

    NPError pluginError = NPERR_GENERIC_ERROR;
    NS_TRY_SAFE_CALL_RETURN(
        pluginError, (*pluginFunctions->getvalue)(&mNPP, variable, value), this,
        NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
    NPP_PLUGIN_LOG(
        PLUGIN_LOG_NORMAL,
        ("NPP GetValue called: this=%p, npp=%p, var=%d, value=%p, return=%d\n",
         this, &mNPP, variable, value, pluginError));

    if (pluginError == NPERR_NO_ERROR) {
      rv = NS_OK;
    }
  }

  return rv;
}

nsNPAPIPlugin* nsNPAPIPluginInstance::GetPlugin() { return mPlugin; }

nsresult nsNPAPIPluginInstance::GetNPP(NPP* aNPP) {
  if (aNPP)
    *aNPP = &mNPP;
  else
    return NS_ERROR_NULL_POINTER;

  return NS_OK;
}

NPError nsNPAPIPluginInstance::SetWindowless(bool aWindowless) {
  mWindowless = aWindowless;
  return NPERR_NO_ERROR;
}

NPError nsNPAPIPluginInstance::SetTransparent(bool aTransparent) {
  mTransparent = aTransparent;
  return NPERR_NO_ERROR;
}

NPError nsNPAPIPluginInstance::SetUsesDOMForCursor(bool aUsesDOMForCursor) {
  mUsesDOMForCursor = aUsesDOMForCursor;
  return NPERR_NO_ERROR;
}

bool nsNPAPIPluginInstance::UsesDOMForCursor() { return mUsesDOMForCursor; }

void nsNPAPIPluginInstance::SetDrawingModel(NPDrawingModel aModel) {
  mDrawingModel = aModel;
}

void nsNPAPIPluginInstance::RedrawPlugin() { mOwner->RedrawPlugin(); }

#if defined(XP_MACOSX)
void nsNPAPIPluginInstance::SetEventModel(NPEventModel aModel) {
  // the event model needs to be set for the object frame immediately
  if (!mOwner) {
    NS_WARNING("Trying to set event model without a plugin instance owner!");
    return;
  }

  mOwner->SetEventModel(aModel);
}
#endif

nsresult nsNPAPIPluginInstance::GetDrawingModel(int32_t* aModel) {
  *aModel = (int32_t)mDrawingModel;
  return NS_OK;
}

nsresult nsNPAPIPluginInstance::IsRemoteDrawingCoreAnimation(bool* aDrawing) {
#ifdef XP_MACOSX
  if (!mPlugin) return NS_ERROR_FAILURE;

  PluginLibrary* library = mPlugin->GetLibrary();
  if (!library) return NS_ERROR_FAILURE;

  return library->IsRemoteDrawingCoreAnimation(&mNPP, aDrawing);
#else
  return NS_ERROR_FAILURE;
#endif
}

nsresult nsNPAPIPluginInstance::ContentsScaleFactorChanged(
    double aContentsScaleFactor) {
#if defined(XP_MACOSX) || defined(XP_WIN)
  if (!mPlugin) return NS_ERROR_FAILURE;

  PluginLibrary* library = mPlugin->GetLibrary();
  if (!library) return NS_ERROR_FAILURE;

  // We only need to call this if the plugin is running OOP.
  if (!library->IsOOP()) return NS_OK;

  return library->ContentsScaleFactorChanged(&mNPP, aContentsScaleFactor);
#else
  return NS_ERROR_FAILURE;
#endif
}

nsresult nsNPAPIPluginInstance::CSSZoomFactorChanged(float aCSSZoomFactor) {
  if (RUNNING != mRunning) return NS_OK;

  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("nsNPAPIPluginInstance informing plugin of "
                                 "CSS Zoom Factor change this=%p\n",
                                 this));

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  if (!pluginFunctions->setvalue) return NS_ERROR_FAILURE;

  PluginDestructionGuard guard(this);

  NPError error;
  double value = static_cast<double>(aCSSZoomFactor);
  NS_TRY_SAFE_CALL_RETURN(
      error, (*pluginFunctions->setvalue)(&mNPP, NPNVCSSZoomFactor, &value),
      this, NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
  return (error == NPERR_NO_ERROR) ? NS_OK : NS_ERROR_FAILURE;
}

nsresult nsNPAPIPluginInstance::GetJSObject(JSContext* cx,
                                            JSObject** outObject) {
  NPObject* npobj = nullptr;
  nsresult rv = GetValueFromPlugin(NPPVpluginScriptableNPObject, &npobj);
  if (NS_FAILED(rv) || !npobj) return NS_ERROR_FAILURE;

  *outObject = nsNPObjWrapper::GetNewOrUsed(&mNPP, cx, npobj);

  _releaseobject(npobj);

  return NS_OK;
}

void nsNPAPIPluginInstance::SetCached(bool aCache) { mCached = aCache; }

bool nsNPAPIPluginInstance::ShouldCache() { return mCached; }

nsresult nsNPAPIPluginInstance::IsWindowless(bool* isWindowless) {
#if defined(XP_MACOSX)
  // All OS X plugins are windowless.
  *isWindowless = true;
#else
  *isWindowless = mWindowless;
#endif
  return NS_OK;
}

class MOZ_STACK_CLASS AutoPluginLibraryCall {
 public:
  explicit AutoPluginLibraryCall(nsNPAPIPluginInstance* aThis)
      : mThis(aThis), mGuard(aThis), mLibrary(nullptr) {
    nsNPAPIPlugin* plugin = mThis->GetPlugin();
    if (plugin) mLibrary = plugin->GetLibrary();
  }
  explicit operator bool() { return !!mLibrary; }
  PluginLibrary* operator->() { return mLibrary; }

 private:
  nsNPAPIPluginInstance* mThis;
  PluginDestructionGuard mGuard;
  PluginLibrary* mLibrary;
};

nsresult nsNPAPIPluginInstance::AsyncSetWindow(NPWindow* window) {
  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  if (!library) return NS_ERROR_FAILURE;

  return library->AsyncSetWindow(&mNPP, window);
}

nsresult nsNPAPIPluginInstance::GetImageContainer(ImageContainer** aContainer) {
  *aContainer = nullptr;

  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  return !library ? NS_ERROR_FAILURE
                  : library->GetImageContainer(&mNPP, aContainer);
}

nsresult nsNPAPIPluginInstance::GetImageSize(nsIntSize* aSize) {
  *aSize = nsIntSize(0, 0);

  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  return !library ? NS_ERROR_FAILURE : library->GetImageSize(&mNPP, aSize);
}

#if defined(XP_WIN)
nsresult nsNPAPIPluginInstance::GetScrollCaptureContainer(
    ImageContainer** aContainer) {
  *aContainer = nullptr;

  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  return !library ? NS_ERROR_FAILURE
                  : library->GetScrollCaptureContainer(&mNPP, aContainer);
}
#endif

nsresult nsNPAPIPluginInstance::HandledWindowedPluginKeyEvent(
    const NativeEventData& aKeyEventData, bool aIsConsumed) {
  if (NS_WARN_IF(!mPlugin)) {
    return NS_ERROR_FAILURE;
  }

  PluginLibrary* library = mPlugin->GetLibrary();
  if (NS_WARN_IF(!library)) {
    return NS_ERROR_FAILURE;
  }
  return library->HandledWindowedPluginKeyEvent(&mNPP, aKeyEventData,
                                                aIsConsumed);
}

void nsNPAPIPluginInstance::DidComposite() {
  if (RUNNING != mRunning) return;

  AutoPluginLibraryCall library(this);
  library->DidComposite(&mNPP);
}

nsresult nsNPAPIPluginInstance::NotifyPainted(void) {
  MOZ_ASSERT_UNREACHABLE("Dead code, shouldn't be called.");
  return NS_ERROR_NOT_IMPLEMENTED;
}

nsresult nsNPAPIPluginInstance::GetIsOOP(bool* aIsAsync) {
  AutoPluginLibraryCall library(this);
  if (!library) return NS_ERROR_FAILURE;

  *aIsAsync = library->IsOOP();
  return NS_OK;
}

nsresult nsNPAPIPluginInstance::SetBackgroundUnknown() {
  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  if (!library) return NS_ERROR_FAILURE;

  return library->SetBackgroundUnknown(&mNPP);
}

nsresult nsNPAPIPluginInstance::BeginUpdateBackground(
    nsIntRect* aRect, DrawTarget** aDrawTarget) {
  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  if (!library) return NS_ERROR_FAILURE;

  return library->BeginUpdateBackground(&mNPP, *aRect, aDrawTarget);
}

nsresult nsNPAPIPluginInstance::EndUpdateBackground(nsIntRect* aRect) {
  if (RUNNING != mRunning) return NS_OK;

  AutoPluginLibraryCall library(this);
  if (!library) return NS_ERROR_FAILURE;

  return library->EndUpdateBackground(&mNPP, *aRect);
}

nsresult nsNPAPIPluginInstance::IsTransparent(bool* isTransparent) {
  *isTransparent = mTransparent;
  return NS_OK;
}

nsresult nsNPAPIPluginInstance::GetFormValue(nsAString& aValue) {
  aValue.Truncate();

  char* value = nullptr;
  nsresult rv = GetValueFromPlugin(NPPVformValue, &value);
  if (NS_FAILED(rv) || !value) return NS_ERROR_FAILURE;

  CopyUTF8toUTF16(MakeStringSpan(value), aValue);

  // NPPVformValue allocates with NPN_MemAlloc(), which uses
  // nsMemory.
  free(value);

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::PushPopupsEnabledState(bool aEnabled) {
  nsCOMPtr<nsPIDOMWindowOuter> window = GetDOMWindow();
  if (!window) return NS_ERROR_FAILURE;

  PopupBlocker::PopupControlState oldState =
      PopupBlocker::PushPopupControlState(
          aEnabled ? PopupBlocker::openAllowed : PopupBlocker::openAbused,
          true);

  // XXX(Bug 1631371) Check if this should use a fallible operation as it
  // pretended earlier.
  mPopupStates.AppendElement(oldState);

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::PopPopupsEnabledState() {
  if (mPopupStates.IsEmpty()) {
    // Nothing to pop.
    return NS_OK;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window = GetDOMWindow();
  if (!window) return NS_ERROR_FAILURE;

  PopupBlocker::PopPopupControlState(mPopupStates.PopLastElement());

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::GetPluginAPIVersion(uint16_t* version) {
  NS_ENSURE_ARG_POINTER(version);

  if (!mPlugin) return NS_ERROR_FAILURE;

  if (!mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  *version = pluginFunctions->version;

  return NS_OK;
}

nsresult nsNPAPIPluginInstance::PrivateModeStateChanged(bool enabled) {
  if (RUNNING != mRunning) return NS_OK;

  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("nsNPAPIPluginInstance informing plugin of "
                                 "private mode state change this=%p\n",
                                 this));

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  if (!pluginFunctions->setvalue) return NS_ERROR_FAILURE;

  PluginDestructionGuard guard(this);

  NPError error;
  NPBool value = static_cast<NPBool>(enabled);
  NS_TRY_SAFE_CALL_RETURN(
      error, (*pluginFunctions->setvalue)(&mNPP, NPNVprivateModeBool, &value),
      this, NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
  return (error == NPERR_NO_ERROR) ? NS_OK : NS_ERROR_FAILURE;
}

nsresult nsNPAPIPluginInstance::IsPrivateBrowsing(bool* aEnabled) {
  if (!mOwner) return NS_ERROR_FAILURE;

  nsCOMPtr<Document> doc;
  mOwner->GetDocument(getter_AddRefs(doc));
  NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);

  nsCOMPtr<nsPIDOMWindowOuter> domwindow = doc->GetWindow();
  NS_ENSURE_TRUE(domwindow, NS_ERROR_FAILURE);

  nsCOMPtr<nsIDocShell> docShell = domwindow->GetDocShell();
  nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(docShell);
  *aEnabled = (loadContext && loadContext->UsePrivateBrowsing());
  return NS_OK;
}

static void PluginTimerCallback(nsITimer* aTimer, void* aClosure) {
  nsNPAPITimer* t = (nsNPAPITimer*)aClosure;
  NPP npp = t->npp;
  uint32_t id = t->id;

  PLUGIN_LOG(PLUGIN_LOG_NOISY,
             ("nsNPAPIPluginInstance running plugin timer callback this=%p\n",
              npp->ndata));

  // Some plugins (Flash on Android) calls unscheduletimer
  // from this callback.
  t->inCallback = true;
  (*(t->callback))(npp, id);
  t->inCallback = false;

  // Make sure we still have an instance and the timer is still alive
  // after the callback.
  nsNPAPIPluginInstance* inst = (nsNPAPIPluginInstance*)npp->ndata;
  if (!inst || !inst->TimerWithID(id, nullptr)) return;

  // use UnscheduleTimer to clean up if this is a one-shot timer
  uint32_t timerType;
  t->timer->GetType(&timerType);
  if (t->needUnschedule || timerType == nsITimer::TYPE_ONE_SHOT)
    inst->UnscheduleTimer(id);
}

nsNPAPITimer* nsNPAPIPluginInstance::TimerWithID(uint32_t id, uint32_t* index) {
  uint32_t len = mTimers.Length();
  for (uint32_t i = 0; i < len; i++) {
    if (mTimers[i]->id == id) {
      if (index) *index = i;
      return mTimers[i];
    }
  }
  return nullptr;
}

uint32_t nsNPAPIPluginInstance::ScheduleTimer(
    uint32_t interval, NPBool repeat,
    void (*timerFunc)(NPP npp, uint32_t timerID)) {
  if (RUNNING != mRunning) return 0;

  nsNPAPITimer* newTimer = new nsNPAPITimer();

  newTimer->inCallback = newTimer->needUnschedule = false;
  newTimer->npp = &mNPP;

  // generate ID that is unique to this instance
  uint32_t uniqueID = mTimers.Length();
  while ((uniqueID == 0) || TimerWithID(uniqueID, nullptr)) uniqueID++;
  newTimer->id = uniqueID;

  // create new xpcom timer, scheduled correctly
  nsresult rv;
  const short timerType = (repeat ? (short)nsITimer::TYPE_REPEATING_SLACK
                                  : (short)nsITimer::TYPE_ONE_SHOT);
  rv = NS_NewTimerWithFuncCallback(
      getter_AddRefs(newTimer->timer), PluginTimerCallback, newTimer, interval,
      timerType, "nsNPAPIPluginInstance::ScheduleTimer");
  if (NS_FAILED(rv)) {
    delete newTimer;
    return 0;
  }

  // save callback function
  newTimer->callback = timerFunc;

  // add timer to timers array
  mTimers.AppendElement(newTimer);

  return newTimer->id;
}

void nsNPAPIPluginInstance::UnscheduleTimer(uint32_t timerID) {
  // find the timer struct by ID
  uint32_t index;
  nsNPAPITimer* t = TimerWithID(timerID, &index);
  if (!t) return;

  if (t->inCallback) {
    t->needUnschedule = true;
    return;
  }

  // cancel the timer
  t->timer->Cancel();

  // remove timer struct from array
  mTimers.RemoveElementAt(index);

  // delete timer
  delete t;
}

NPBool nsNPAPIPluginInstance::ConvertPoint(double sourceX, double sourceY,
                                           NPCoordinateSpace sourceSpace,
                                           double* destX, double* destY,
                                           NPCoordinateSpace destSpace) {
  if (mOwner) {
    return mOwner->ConvertPoint(sourceX, sourceY, sourceSpace, destX, destY,
                                destSpace);
  }

  return false;
}

nsresult nsNPAPIPluginInstance::GetDOMElement(Element** result) {
  if (!mOwner) {
    *result = nullptr;
    return NS_ERROR_FAILURE;
  }

  return mOwner->GetDOMElement(result);
}

nsresult nsNPAPIPluginInstance::InvalidateRect(NPRect* invalidRect) {
  if (RUNNING != mRunning) return NS_OK;

  if (!mOwner) return NS_ERROR_FAILURE;

  return mOwner->InvalidateRect(invalidRect);
}

nsresult nsNPAPIPluginInstance::InvalidateRegion(NPRegion invalidRegion) {
  if (RUNNING != mRunning) return NS_OK;

  if (!mOwner) return NS_ERROR_FAILURE;

  return mOwner->InvalidateRegion(invalidRegion);
}

nsresult nsNPAPIPluginInstance::GetMIMEType(const char** result) {
  if (!mMIMEType)
    *result = "";
  else
    *result = mMIMEType;

  return NS_OK;
}

nsPluginInstanceOwner* nsNPAPIPluginInstance::GetOwner() { return mOwner; }

void nsNPAPIPluginInstance::SetOwner(nsPluginInstanceOwner* aOwner) {
  mOwner = aOwner;
}

nsresult nsNPAPIPluginInstance::AsyncSetWindow(NPWindow& window) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

void nsNPAPIPluginInstance::URLRedirectResponse(void* notifyData,
                                                NPBool allow) {
  if (!notifyData) {
    return;
  }

  uint32_t listenerCount = mStreamListeners.Length();
  for (uint32_t i = 0; i < listenerCount; i++) {
    nsNPAPIPluginStreamListener* currentListener = mStreamListeners[i];
    if (currentListener->GetNotifyData() == notifyData) {
      currentListener->URLRedirectResponse(allow);
    }
  }
}

NPError nsNPAPIPluginInstance::InitAsyncSurface(NPSize* size,
                                                NPImageFormat format,
                                                void* initData,
                                                NPAsyncSurface* surface) {
  if (mOwner) {
    return mOwner->InitAsyncSurface(size, format, initData, surface);
  }

  return NPERR_GENERIC_ERROR;
}

NPError nsNPAPIPluginInstance::FinalizeAsyncSurface(NPAsyncSurface* surface) {
  if (mOwner) {
    return mOwner->FinalizeAsyncSurface(surface);
  }

  return NPERR_GENERIC_ERROR;
}

void nsNPAPIPluginInstance::SetCurrentAsyncSurface(NPAsyncSurface* surface,
                                                   NPRect* changed) {
  if (mOwner) {
    mOwner->SetCurrentAsyncSurface(surface, changed);
  }
}

double nsNPAPIPluginInstance::GetContentsScaleFactor() {
  double scaleFactor = 1.0;
  if (mOwner) {
    mOwner->GetContentsScaleFactor(&scaleFactor);
  }
  return scaleFactor;
}

float nsNPAPIPluginInstance::GetCSSZoomFactor() {
  float zoomFactor = 1.0;
  if (mOwner) {
    mOwner->GetCSSZoomFactor(&zoomFactor);
  }
  return zoomFactor;
}

nsresult nsNPAPIPluginInstance::GetRunID(uint32_t* aRunID) {
  if (NS_WARN_IF(!aRunID)) {
    return NS_ERROR_INVALID_POINTER;
  }

  if (NS_WARN_IF(!mPlugin)) {
    return NS_ERROR_FAILURE;
  }

  PluginLibrary* library = mPlugin->GetLibrary();
  if (!library) {
    return NS_ERROR_FAILURE;
  }

  return library->GetRunID(aRunID);
}

nsresult nsNPAPIPluginInstance::CreateAudioChannelAgentIfNeeded() {
  if (mAudioChannelAgent) {
    return NS_OK;
  }

  mAudioChannelAgent = new AudioChannelAgent();

  nsCOMPtr<nsPIDOMWindowOuter> window = GetDOMWindow();
  if (NS_WARN_IF(!window)) {
    return NS_ERROR_FAILURE;
  }

  nsresult rv = mAudioChannelAgent->Init(window->GetCurrentInnerWindow(), this);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return NS_OK;
}

void nsNPAPIPluginInstance::NotifyStartedPlaying() {
  nsresult rv = CreateAudioChannelAgentIfNeeded();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  MOZ_ASSERT(mAudioChannelAgent);
  rv = mAudioChannelAgent->NotifyStartedPlaying(
      mIsMuted ? AudioChannelService::AudibleState::eNotAudible
               : AudioChannelService::AudibleState::eAudible);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  mAudioChannelAgent->PullInitialUpdate();
}

void nsNPAPIPluginInstance::NotifyStoppedPlaying() {
  MOZ_ASSERT(mAudioChannelAgent);
  nsresult rv = mAudioChannelAgent->NotifyStoppedPlaying();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }
}

NS_IMETHODIMP
nsNPAPIPluginInstance::WindowVolumeChanged(float aVolume, bool aMuted) {
  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
          ("nsNPAPIPluginInstance, WindowVolumeChanged, "
           "this = %p, aVolume = %f, aMuted = %s\n",
           this, aVolume, aMuted ? "true" : "false"));
  // We just support mute/unmute
  if (mWindowMuted != aMuted) {
    mWindowMuted = aMuted;
    return UpdateMutedIfNeeded();
  }
  return NS_OK;
}

NS_IMETHODIMP
nsNPAPIPluginInstance::WindowSuspendChanged(nsSuspendedTypes aSuspend) {
  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
          ("nsNPAPIPluginInstance, WindowSuspendChanged, "
           "this = %p, aSuspend = %s\n",
           this, SuspendTypeToStr(aSuspend)));
  const bool isSuspended = aSuspend != nsISuspendedTypes::NONE_SUSPENDED;
  if (mWindowSuspended != isSuspended) {
    mWindowSuspended = isSuspended;
    // It doesn't support suspending, so we just do something like mute/unmute.
    return UpdateMutedIfNeeded();
  }
  return NS_OK;
}

NS_IMETHODIMP
nsNPAPIPluginInstance::WindowAudioCaptureChanged(bool aCapture) {
  return NS_OK;
}

void nsNPAPIPluginInstance::NotifyAudibleStateChanged() const {
  // This happens when global window destroyed, we would notify agent's callback
  // to mute its volume, but the nsNSNPAPI had released the agent before that.
  if (!mAudioChannelAgent) {
    return;
  }
  AudioChannelService::AudibleState audibleState =
      mIsMuted ? AudioChannelService::AudibleState::eNotAudible
               : AudioChannelService::AudibleState::eAudible;
  // Because we don't really support suspending nsNPAPI, so all audible changes
  // come from changing its volume.
  mAudioChannelAgent->NotifyStartedAudible(
      audibleState, AudioChannelService::AudibleChangedReasons::eVolumeChanged);
}

nsresult nsNPAPIPluginInstance::UpdateMutedIfNeeded() {
  const bool shouldMute = mWindowSuspended || mWindowMuted;
  if (mIsMuted == shouldMute) {
    return NS_OK;
  }

  mIsMuted = shouldMute;
  NotifyAudibleStateChanged();
  nsresult rv = SetMuted(mIsMuted);
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "SetMuted failed");
  return rv;
}

nsresult nsNPAPIPluginInstance::SetMuted(bool aIsMuted) {
  if (RUNNING != mRunning) return NS_OK;

  PLUGIN_LOG(
      PLUGIN_LOG_NORMAL,
      ("nsNPAPIPluginInstance informing plugin of mute state change this=%p\n",
       this));

  if (!mPlugin || !mPlugin->GetLibrary()) return NS_ERROR_FAILURE;

  NPPluginFuncs* pluginFunctions = mPlugin->PluginFuncs();

  if (!pluginFunctions->setvalue) return NS_ERROR_FAILURE;

  PluginDestructionGuard guard(this);

  NPError error;
  NPBool value = static_cast<NPBool>(aIsMuted);
  NS_TRY_SAFE_CALL_RETURN(
      error, (*pluginFunctions->setvalue)(&mNPP, NPNVmuteAudioBool, &value),
      this, NS_PLUGIN_CALL_UNSAFE_TO_REENTER_GECKO);
  return (error == NPERR_NO_ERROR) ? NS_OK : NS_ERROR_FAILURE;
}