/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: sw=4 ts=4 et :
 * 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/. */

#ifdef MOZ_WIDGET_GTK
#include <glib.h>
#elif XP_MACOSX
#include "PluginInterposeOSX.h"
#include "PluginUtilsOSX.h"
#endif
#ifdef MOZ_WIDGET_QT
#include <QtCore/QCoreApplication>
#include <QtCore/QEventLoop>
#include "NestedLoopTimer.h"
#endif

#include "base/process_util.h"

#include "mozilla/Preferences.h"
#include "mozilla/unused.h"
#include "mozilla/ipc/SyncChannel.h"
#include "mozilla/plugins/PluginModuleParent.h"
#include "mozilla/plugins/BrowserStreamParent.h"
#include "PluginIdentifierParent.h"

#include "nsAutoPtr.h"
#include "nsCRT.h"
#include "nsNPAPIPlugin.h"
#include "nsIFile.h"
#include "nsPrintfCString.h"

#include "prsystem.h"

#ifdef XP_WIN
#include "PluginHangUIParent.h"
#include "mozilla/widget/AudioSession.h"
#endif
#include "mozilla/Services.h"
#include "nsIObserverService.h"

using base::KillProcess;

using mozilla::PluginLibrary;
using mozilla::ipc::SyncChannel;

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

static const char kChildTimeoutPref[] = "dom.ipc.plugins.timeoutSecs";
static const char kParentTimeoutPref[] = "dom.ipc.plugins.parentTimeoutSecs";
static const char kLaunchTimeoutPref[] = "dom.ipc.plugins.processLaunchTimeoutSecs";
#ifdef XP_WIN
static const char kHangUITimeoutPref[] = "dom.ipc.plugins.hangUITimeoutSecs";
static const char kHangUIMinDisplayPref[] = "dom.ipc.plugins.hangUIMinDisplaySecs";
#define CHILD_TIMEOUT_PREF kHangUITimeoutPref
#else
#define CHILD_TIMEOUT_PREF kChildTimeoutPref
#endif

template<>
struct RunnableMethodTraits<mozilla::plugins::PluginModuleParent>
{
    typedef mozilla::plugins::PluginModuleParent Class;
    static void RetainCallee(Class* obj) { }
    static void ReleaseCallee(Class* obj) { }
};

// static
PluginLibrary*
PluginModuleParent::LoadModule(const char* aFilePath)
{
    PLUGIN_LOG_DEBUG_FUNCTION;

    int32_t prefSecs = Preferences::GetInt(kLaunchTimeoutPref, 0);

    // Block on the child process being launched and initialized.
    nsAutoPtr<PluginModuleParent> parent(new PluginModuleParent(aFilePath));
    bool launched = parent->mSubprocess->Launch(prefSecs * 1000);
    if (!launched) {
        // Need to set this so the destructor doesn't complain.
        parent->mShutdown = true;
        return nullptr;
    }
    parent->Open(parent->mSubprocess->GetChannel(),
                 parent->mSubprocess->GetChildProcessHandle());

    TimeoutChanged(CHILD_TIMEOUT_PREF, parent);

    return parent.forget();
}


PluginModuleParent::PluginModuleParent(const char* aFilePath)
    : mSubprocess(new PluginProcessParent(aFilePath))
    , mShutdown(false)
    , mClearSiteDataSupported(false)
    , mGetSitesWithDataSupported(false)
    , mNPNIface(NULL)
    , mPlugin(NULL)
    , ALLOW_THIS_IN_INITIALIZER_LIST(mTaskFactory(this))
#ifdef XP_WIN
    , mPluginCpuUsageOnHang()
    , mHangUIParent(nullptr)
    , mHangUIEnabled(true)
    , mIsTimerReset(true)
#endif
{
    NS_ASSERTION(mSubprocess, "Out of memory!");

    mIdentifiers.Init();

    Preferences::RegisterCallback(TimeoutChanged, kChildTimeoutPref, this);
    Preferences::RegisterCallback(TimeoutChanged, kParentTimeoutPref, this);
#ifdef XP_WIN
    Preferences::RegisterCallback(TimeoutChanged, kHangUITimeoutPref, this);
    Preferences::RegisterCallback(TimeoutChanged, kHangUIMinDisplayPref, this);
#endif
}

PluginModuleParent::~PluginModuleParent()
{
    NS_ASSERTION(OkToCleanup(), "unsafe destruction");

    if (!mShutdown) {
        NS_WARNING("Plugin host deleted the module without shutting down.");
        NPError err;
        NP_Shutdown(&err);
    }
    NS_ASSERTION(mShutdown, "NP_Shutdown didn't");

    if (mSubprocess) {
        mSubprocess->Delete();
        mSubprocess = nullptr;
    }

    Preferences::UnregisterCallback(TimeoutChanged, kChildTimeoutPref, this);
    Preferences::UnregisterCallback(TimeoutChanged, kParentTimeoutPref, this);
#ifdef XP_WIN
    Preferences::UnregisterCallback(TimeoutChanged, kHangUITimeoutPref, this);
    Preferences::UnregisterCallback(TimeoutChanged, kHangUIMinDisplayPref, this);

    if (mHangUIParent) {
        delete mHangUIParent;
        mHangUIParent = nullptr;
    }
#endif
}

void
PluginModuleParent::SetChildTimeout(const int32_t aChildTimeout)
{
    int32_t timeoutMs = (aChildTimeout > 0) ? (1000 * aChildTimeout) :
                      SyncChannel::kNoTimeout;
    SetReplyTimeoutMs(timeoutMs);
}

int
PluginModuleParent::TimeoutChanged(const char* aPref, void* aModule)
{
    NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
#ifndef XP_WIN
    if (!strcmp(aPref, kChildTimeoutPref)) {
      // The timeout value used by the parent for children
      int32_t timeoutSecs = Preferences::GetInt(kChildTimeoutPref, 0);
      static_cast<PluginModuleParent*>(aModule)->SetChildTimeout(timeoutSecs);
#else
    if (!strcmp(aPref, kChildTimeoutPref) ||
        !strcmp(aPref, kHangUIMinDisplayPref) ||
        !strcmp(aPref, kHangUITimeoutPref)) {
      static_cast<PluginModuleParent*>(aModule)->EvaluateHangUIState(true);
#endif // XP_WIN
    } else if (!strcmp(aPref, kParentTimeoutPref)) {
      // The timeout value used by the child for its parent
      int32_t timeoutSecs = Preferences::GetInt(kParentTimeoutPref, 0);
      unused << static_cast<PluginModuleParent*>(aModule)->SendSetParentHangTimeout(timeoutSecs);
    }
    return 0;
}

void
PluginModuleParent::CleanupFromTimeout(const bool aFromHangUI)
{
    if (mShutdown) {
      return;
    }

    if (!OkToCleanup()) {
        // there's still plugin code on the C++ stack, try again
        MessageLoop::current()->PostDelayedTask(
            FROM_HERE,
            mTaskFactory.NewRunnableMethod(
                &PluginModuleParent::CleanupFromTimeout, aFromHangUI), 10);
        return;
    }

    /* If the plugin container was terminated by the Plugin Hang UI, 
       then either the I/O thread detects a channel error, or the 
       main thread must set the error (whomever gets there first).
       OTOH, if we terminate and return false from 
       ShouldContinueFromReplyTimeout, then the channel state has 
       already been set to ChannelTimeout and we should call the 
       regular Close function. */
    if (aFromHangUI) {
        GetIPCChannel()->CloseWithError();
    } else {
        Close();
    }
}

#ifdef XP_WIN
namespace {

uint64_t
FileTimeToUTC(const FILETIME& ftime) 
{
  ULARGE_INTEGER li;
  li.LowPart = ftime.dwLowDateTime;
  li.HighPart = ftime.dwHighDateTime;
  return li.QuadPart;
}

struct CpuUsageSamples
{
  uint64_t sampleTimes[2];
  uint64_t cpuTimes[2];
};

bool 
GetProcessCpuUsage(const InfallibleTArray<base::ProcessHandle>& processHandles, InfallibleTArray<float>& cpuUsage)
{
  InfallibleTArray<CpuUsageSamples> samples(processHandles.Length());
  FILETIME creationTime, exitTime, kernelTime, userTime, currentTime;
  BOOL res;

  for (uint32_t i = 0; i < processHandles.Length(); ++i) {
    ::GetSystemTimeAsFileTime(&currentTime);
    res = ::GetProcessTimes(processHandles[i], &creationTime, &exitTime, &kernelTime, &userTime);
    if (!res) {
      NS_WARNING("failed to get process times");
      return false;
    }
  
    CpuUsageSamples s;
    s.sampleTimes[0] = FileTimeToUTC(currentTime);
    s.cpuTimes[0]    = FileTimeToUTC(kernelTime) + FileTimeToUTC(userTime);
    samples.AppendElement(s);
  }

  // we already hung for a while, a little bit longer won't matter
  ::Sleep(50);

  const int32_t numberOfProcessors = PR_GetNumberOfProcessors();

  for (uint32_t i = 0; i < processHandles.Length(); ++i) {
    ::GetSystemTimeAsFileTime(&currentTime);
    res = ::GetProcessTimes(processHandles[i], &creationTime, &exitTime, &kernelTime, &userTime);
    if (!res) {
      NS_WARNING("failed to get process times");
      return false;
    }

    samples[i].sampleTimes[1] = FileTimeToUTC(currentTime);
    samples[i].cpuTimes[1]    = FileTimeToUTC(kernelTime) + FileTimeToUTC(userTime);    

    const uint64_t deltaSampleTime = samples[i].sampleTimes[1] - samples[i].sampleTimes[0];
    const uint64_t deltaCpuTime    = samples[i].cpuTimes[1]    - samples[i].cpuTimes[0];
    const float usage = 100.f * (float(deltaCpuTime) / deltaSampleTime) / numberOfProcessors;
    cpuUsage.AppendElement(usage);
  }

  return true;
}

} // anonymous namespace

void
PluginModuleParent::ExitedCxxStack()
{
    FinishHangUI();
}

#endif // #ifdef XP_WIN

bool
PluginModuleParent::ShouldContinueFromReplyTimeout()
{
#ifdef XP_WIN
    if (LaunchHangUI()) {
        return true;
    }
    // If LaunchHangUI returned false then we should proceed with the 
    // original plugin hang behaviour and kill the plugin container.
    FinishHangUI();
#endif // XP_WIN
    TerminateChildProcess(MessageLoop::current());
    return false;
}

void
PluginModuleParent::TerminateChildProcess(MessageLoop* aMsgLoop)
{

#ifdef XP_WIN
    // collect cpu usage for plugin processes

    InfallibleTArray<base::ProcessHandle> processHandles;

    processHandles.AppendElement(OtherProcess());

    if (!GetProcessCpuUsage(processHandles, mPluginCpuUsageOnHang)) {
      mPluginCpuUsageOnHang.Clear();
    }
#endif

    // this must run before the error notification from the channel,
    // or not at all
    bool isFromHangUI = aMsgLoop != MessageLoop::current();
    if (isFromHangUI) {
        // If we're posting from a different thread we can't create
        // the task via mTaskFactory
        aMsgLoop->PostTask(FROM_HERE,
                           NewRunnableMethod(this,
                               &PluginModuleParent::CleanupFromTimeout,
                               isFromHangUI));
    } else {
        aMsgLoop->PostTask(
            FROM_HERE,
            mTaskFactory.NewRunnableMethod(
                &PluginModuleParent::CleanupFromTimeout, isFromHangUI));
    }

    if (!KillProcess(OtherProcess(), 1, false))
        NS_WARNING("failed to kill subprocess!");
}

#ifdef XP_WIN
void
PluginModuleParent::EvaluateHangUIState(const bool aReset)
{
    int32_t minDispSecs = Preferences::GetInt(kHangUIMinDisplayPref, 10);
    int32_t autoStopSecs = Preferences::GetInt(kChildTimeoutPref, 0);
    int32_t timeoutSecs = 0;
    if (autoStopSecs > 0 && autoStopSecs < minDispSecs) {
        /* If we're going to automatically terminate the plugin within a 
           time frame shorter than minDispSecs, there's no point in 
           showing the hang UI; it would just flash briefly on the screen. */
        mHangUIEnabled = false;
    } else {
        timeoutSecs = Preferences::GetInt(kHangUITimeoutPref, 0);
        mHangUIEnabled = timeoutSecs > 0;
    }
    if (mHangUIEnabled) {
        if (aReset) {
            mIsTimerReset = true;
            SetChildTimeout(timeoutSecs);
            return;
        } else if (mIsTimerReset) {
            /* The Hang UI is being shown, so now we're setting the 
               timeout to kChildTimeoutPref while we wait for a user 
               response. ShouldContinueFromReplyTimeout will fire 
               after (reply timeout / 2) seconds, which is not what 
               we want. Doubling the timeout value here so that we get 
               the right result. */
            autoStopSecs *= 2;
        }
    }
    mIsTimerReset = false;
    SetChildTimeout(autoStopSecs);
}

bool
PluginModuleParent::GetPluginName(nsAString& aPluginName)
{
    nsRefPtr<nsPluginHost> host = nsPluginHost::GetInst();
    if (!host) {
        return false;
    }
    nsPluginTag* pluginTag = host->TagForPlugin(mPlugin);
    if (!pluginTag) {
        return false;
    }
    CopyUTF8toUTF16(pluginTag->mName, aPluginName);
    return true;
}

bool
PluginModuleParent::LaunchHangUI()
{
    if (!mHangUIEnabled) {
        return false;
    }
    if (mHangUIParent) {
        if (mHangUIParent->IsShowing()) {
            // We've already shown the UI but the timeout has expired again.
            return false;
        }
        if (mHangUIParent->DontShowAgain()) {
            return !mHangUIParent->WasLastHangStopped();
        }
        delete mHangUIParent;
        mHangUIParent = nullptr;
    }
    mHangUIParent = new PluginHangUIParent(this, 
            Preferences::GetInt(kHangUITimeoutPref, 0),
            Preferences::GetInt(kChildTimeoutPref, 0));
    nsAutoString pluginName;
    if (!GetPluginName(pluginName)) {
        return false;
    }
    bool retval = mHangUIParent->Init(pluginName);
    if (retval) {
        /* Once the UI is shown we switch the timeout over to use 
           kChildTimeoutPref, allowing us to terminate a hung plugin 
           after kChildTimeoutPref seconds if the user doesn't respond to 
           the hang UI. */
        EvaluateHangUIState(false);
    }
    return retval;
}

void
PluginModuleParent::FinishHangUI()
{
    if (mHangUIEnabled && mHangUIParent) {
        bool needsCancel = mHangUIParent->IsShowing();
        // If we're still showing, send a Cancel notification
        if (needsCancel) {
            mHangUIParent->Cancel();
        }
        /* If we cancelled the UI or if the user issued a response,
           we need to reset the child process timeout. */
        if (needsCancel ||
            !mIsTimerReset && mHangUIParent->WasShown()) {
            /* We changed the timeout to kChildTimeoutPref when the plugin hang
               UI was displayed. Now that we're finishing the UI, we need to 
               switch it back to kHangUITimeoutPref. */
            EvaluateHangUIState(true);
        }
    }
}
#endif // XP_WIN

void
PluginModuleParent::ActorDestroy(ActorDestroyReason why)
{
    switch (why) {
    case AbnormalShutdown: {
        mShutdown = true;
        // Defer the PluginCrashed method so that we don't re-enter
        // and potentially modify the actor child list while enumerating it.
        if (mPlugin)
            MessageLoop::current()->PostTask(
                FROM_HERE,
                mTaskFactory.NewRunnableMethod(
                    &PluginModuleParent::NotifyPluginCrashed));
        break;
    }
    case NormalShutdown:
        mShutdown = true;
        break;

    default:
        NS_ERROR("Unexpected shutdown reason for toplevel actor.");
    }
}

void
PluginModuleParent::NotifyPluginCrashed()
{
    if (!OkToCleanup()) {
        // there's still plugin code on the C++ stack.  try again
        MessageLoop::current()->PostDelayedTask(
            FROM_HERE,
            mTaskFactory.NewRunnableMethod(
                &PluginModuleParent::NotifyPluginCrashed), 10);
        return;
    }

    if (mPlugin)
        mPlugin->PluginCrashed(mPluginDumpID, mBrowserDumpID);
}

PPluginIdentifierParent*
PluginModuleParent::AllocPPluginIdentifier(const nsCString& aString,
                                           const int32_t& aInt,
                                           const bool& aTemporary)
{
    if (aTemporary) {
        NS_ERROR("Plugins don't create temporary identifiers.");
        return NULL; // should abort the plugin
    }

    NPIdentifier npident = aString.IsVoid() ?
        mozilla::plugins::parent::_getintidentifier(aInt) :
        mozilla::plugins::parent::_getstringidentifier(aString.get());

    if (!npident) {
        NS_WARNING("Failed to get identifier!");
        return nullptr;
    }

    PluginIdentifierParent* ident = new PluginIdentifierParent(npident, false);
    mIdentifiers.Put(npident, ident);
    return ident;
}

bool
PluginModuleParent::DeallocPPluginIdentifier(PPluginIdentifierParent* aActor)
{
    delete aActor;
    return true;
}

PPluginInstanceParent*
PluginModuleParent::AllocPPluginInstance(const nsCString& aMimeType,
                                         const uint16_t& aMode,
                                         const InfallibleTArray<nsCString>& aNames,
                                         const InfallibleTArray<nsCString>& aValues,
                                         NPError* rv)
{
    NS_ERROR("Not reachable!");
    return NULL;
}

bool
PluginModuleParent::DeallocPPluginInstance(PPluginInstanceParent* aActor)
{
    PLUGIN_LOG_DEBUG_METHOD;
    delete aActor;
    return true;
}

void
PluginModuleParent::SetPluginFuncs(NPPluginFuncs* aFuncs)
{
    aFuncs->version = (NP_VERSION_MAJOR << 8) | NP_VERSION_MINOR;
    aFuncs->javaClass = nullptr;

    // Goanna should always call these functions through a PluginLibrary object.
    aFuncs->newp = NULL;
    aFuncs->clearsitedata = NULL;
    aFuncs->getsiteswithdata = NULL;

    aFuncs->destroy = NPP_Destroy;
    aFuncs->setwindow = NPP_SetWindow;
    aFuncs->newstream = NPP_NewStream;
    aFuncs->destroystream = NPP_DestroyStream;
    aFuncs->asfile = NPP_StreamAsFile;
    aFuncs->writeready = NPP_WriteReady;
    aFuncs->write = NPP_Write;
    aFuncs->print = NPP_Print;
    aFuncs->event = NPP_HandleEvent;
    aFuncs->urlnotify = NPP_URLNotify;
    aFuncs->getvalue = NPP_GetValue;
    aFuncs->setvalue = NPP_SetValue;
    aFuncs->gotfocus = NULL;
    aFuncs->lostfocus = NULL;
    aFuncs->urlredirectnotify = NULL;

    // Provide 'NPP_URLRedirectNotify', 'NPP_ClearSiteData', and
    // 'NPP_GetSitesWithData' functionality if it is supported by the plugin.
    bool urlRedirectSupported = false;
    unused << CallOptionalFunctionsSupported(&urlRedirectSupported,
                                             &mClearSiteDataSupported,
                                             &mGetSitesWithDataSupported);
    if (urlRedirectSupported) {
      aFuncs->urlredirectnotify = NPP_URLRedirectNotify;
    }
}

NPError
PluginModuleParent::NPP_Destroy(NPP instance,
                                NPSavedData** /*saved*/)
{
    // FIXME/cjones:
    //  (1) send a "destroy" message to the child
    //  (2) the child shuts down its instance
    //  (3) remove both parent and child IDs from map
    //  (4) free parent
    PLUGIN_LOG_DEBUG_FUNCTION;

    PluginInstanceParent* parentInstance =
        static_cast<PluginInstanceParent*>(instance->pdata);

    if (!parentInstance)
        return NPERR_NO_ERROR;

    NPError retval = parentInstance->Destroy();
    instance->pdata = nullptr;

    unused << PluginInstanceParent::Call__delete__(parentInstance);
    return retval;
}

NPError
PluginModuleParent::NPP_NewStream(NPP instance, NPMIMEType type,
                                  NPStream* stream, NPBool seekable,
                                  uint16_t* stype)
{
    PROFILER_LABEL("PluginModuleParent", "NPP_NewStream");
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_NewStream(type, stream, seekable,
                            stype);
}

NPError
PluginModuleParent::NPP_SetWindow(NPP instance, NPWindow* window)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_SetWindow(window);
}

NPError
PluginModuleParent::NPP_DestroyStream(NPP instance,
                                      NPStream* stream,
                                      NPReason reason)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_DestroyStream(stream, reason);
}

int32_t
PluginModuleParent::NPP_WriteReady(NPP instance,
                                   NPStream* stream)
{
    BrowserStreamParent* s = StreamCast(instance, stream);
    if (!s)
        return -1;

    return s->WriteReady();
}

int32_t
PluginModuleParent::NPP_Write(NPP instance,
                              NPStream* stream,
                              int32_t offset,
                              int32_t len,
                              void* buffer)
{
    BrowserStreamParent* s = StreamCast(instance, stream);
    if (!s)
        return -1;

    return s->Write(offset, len, buffer);
}

void
PluginModuleParent::NPP_StreamAsFile(NPP instance,
                                     NPStream* stream,
                                     const char* fname)
{
    BrowserStreamParent* s = StreamCast(instance, stream);
    if (!s)
        return;

    s->StreamAsFile(fname);
}

void
PluginModuleParent::NPP_Print(NPP instance, NPPrint* platformPrint)
{
    PluginInstanceParent* i = InstCast(instance);
    if (i)
        i->NPP_Print(platformPrint);
}

int16_t
PluginModuleParent::NPP_HandleEvent(NPP instance, void* event)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return false;

    return i->NPP_HandleEvent(event);
}

void
PluginModuleParent::NPP_URLNotify(NPP instance, const char* url,
                                  NPReason reason, void* notifyData)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return;

    i->NPP_URLNotify(url, reason, notifyData);
}

NPError
PluginModuleParent::NPP_GetValue(NPP instance,
                                 NPPVariable variable, void *ret_value)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_GetValue(variable, ret_value);
}

NPError
PluginModuleParent::NPP_SetValue(NPP instance, NPNVariable variable,
                                 void *value)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_SetValue(variable, value);
}

bool
PluginModuleParent::RecvBackUpXResources(const FileDescriptor& aXSocketFd)
{
#ifndef MOZ_X11
    NS_RUNTIMEABORT("This message only makes sense on X11 platforms");
#else
    NS_ABORT_IF_FALSE(0 > mPluginXSocketFdDup.get(),
                      "Already backed up X resources??");
    mPluginXSocketFdDup.forget();
    if (aXSocketFd.IsValid()) {
      mPluginXSocketFdDup.reset(aXSocketFd.PlatformHandle());
    }
#endif
    return true;
}

void
PluginModuleParent::NPP_URLRedirectNotify(NPP instance, const char* url,
                                          int32_t status, void* notifyData)
{
  PluginInstanceParent* i = InstCast(instance);
  if (!i)
    return;

  i->NPP_URLRedirectNotify(url, status, notifyData);
}

bool
PluginModuleParent::AnswerNPN_UserAgent(nsCString* userAgent)
{
    *userAgent = NullableString(mNPNIface->uagent(nullptr));
    return true;
}

PluginIdentifierParent*
PluginModuleParent::GetIdentifierForNPIdentifier(NPP npp, NPIdentifier aIdentifier)
{
    PluginIdentifierParent* ident;
    if (mIdentifiers.Get(aIdentifier, &ident)) {
        if (ident->IsTemporary()) {
            ident->AddTemporaryRef();
        }
        return ident;
    }

    nsCString string;
    int32_t intval = -1;
    bool temporary = false;
    if (mozilla::plugins::parent::_identifierisstring(aIdentifier)) {
        NPUTF8* chars =
            mozilla::plugins::parent::_utf8fromidentifier(aIdentifier);
        if (!chars) {
            return nullptr;
        }
        string.Adopt(chars);
        temporary = !NPStringIdentifierIsPermanent(npp, aIdentifier);
    }
    else {
        intval = mozilla::plugins::parent::_intfromidentifier(aIdentifier);
        string.SetIsVoid(true);
    }

    ident = new PluginIdentifierParent(aIdentifier, temporary);
    if (!SendPPluginIdentifierConstructor(ident, string, intval, temporary))
        return nullptr;

    if (!temporary) {
        mIdentifiers.Put(aIdentifier, ident);
    }
    return ident;
}

PluginInstanceParent*
PluginModuleParent::InstCast(NPP instance)
{
    PluginInstanceParent* ip =
        static_cast<PluginInstanceParent*>(instance->pdata);

    // If the plugin crashed and the PluginInstanceParent was deleted,
    // instance->pdata will be NULL.
    if (!ip)
        return NULL;

    if (instance != ip->mNPP) {
        NS_RUNTIMEABORT("Corrupted plugin data.");
    }
    return ip;
}

BrowserStreamParent*
PluginModuleParent::StreamCast(NPP instance,
                               NPStream* s)
{
    PluginInstanceParent* ip = InstCast(instance);
    if (!ip)
        return NULL;

    BrowserStreamParent* sp =
        static_cast<BrowserStreamParent*>(static_cast<AStream*>(s->pdata));
    if (sp->mNPP != ip || s != sp->mStream) {
        NS_RUNTIMEABORT("Corrupted plugin stream data.");
    }
    return sp;
}

bool
PluginModuleParent::HasRequiredFunctions()
{
    return true;
}

nsresult
PluginModuleParent::AsyncSetWindow(NPP instance, NPWindow* window)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->AsyncSetWindow(window);
}

#if defined(MOZ_WIDGET_QT) && (MOZ_PLATFORM_MAEMO == 6)
nsresult
PluginModuleParent::HandleGUIEvent(NPP instance,
                                   const nsGUIEvent& anEvent,
                                   bool* handled)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->HandleGUIEvent(anEvent, handled);
}
#endif

nsresult
PluginModuleParent::GetImageContainer(NPP instance,
                             mozilla::layers::ImageContainer** aContainer)
{
    PluginInstanceParent* i = InstCast(instance);
    return !i ? NS_ERROR_FAILURE : i->GetImageContainer(aContainer);
}

nsresult
PluginModuleParent::GetImageSize(NPP instance,
                                 nsIntSize* aSize)
{
    PluginInstanceParent* i = InstCast(instance);
    return !i ? NS_ERROR_FAILURE : i->GetImageSize(aSize);
}

nsresult
PluginModuleParent::SetBackgroundUnknown(NPP instance)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->SetBackgroundUnknown();
}

nsresult
PluginModuleParent::BeginUpdateBackground(NPP instance,
                                          const nsIntRect& aRect,
                                          gfxContext** aCtx)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->BeginUpdateBackground(aRect, aCtx);
}

nsresult
PluginModuleParent::EndUpdateBackground(NPP instance,
                                        gfxContext* aCtx,
                                        const nsIntRect& aRect)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->EndUpdateBackground(aCtx, aRect);
}

#if defined(XP_UNIX) && !defined(XP_MACOSX) && !defined(MOZ_WIDGET_GONK)
nsresult
PluginModuleParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPPluginFuncs* pFuncs, NPError* error)
{
    PLUGIN_LOG_DEBUG_METHOD;

    mNPNIface = bFuncs;

    if (mShutdown) {
        *error = NPERR_GENERIC_ERROR;
        return NS_ERROR_FAILURE;
    }

    uint32_t flags = 0;

    if (!CallNP_Initialize(flags, error)) {
        return NS_ERROR_FAILURE;
    }
    else if (*error != NPERR_NO_ERROR) {
        return NS_OK;
    }

    SetPluginFuncs(pFuncs);

    return NS_OK;
}
#else
nsresult
PluginModuleParent::NP_Initialize(NPNetscapeFuncs* bFuncs, NPError* error)
{
    PLUGIN_LOG_DEBUG_METHOD;

    mNPNIface = bFuncs;

    if (mShutdown) {
        *error = NPERR_GENERIC_ERROR;
        return NS_ERROR_FAILURE;
    }

    uint32_t flags = 0;
#ifdef XP_WIN
    flags |= kAllowAsyncDrawing;
#endif

    if (!CallNP_Initialize(flags, error))
        return NS_ERROR_FAILURE;

#if defined XP_WIN
    // Send the info needed to join the chrome process's audio session to the
    // plugin process
    nsID id;
    nsString sessionName;
    nsString iconPath;

    if (NS_SUCCEEDED(mozilla::widget::GetAudioSessionData(id, sessionName,
                                                          iconPath)))
        unused << SendSetAudioSessionData(id, sessionName, iconPath);
#endif

    return NS_OK;
}
#endif

nsresult
PluginModuleParent::NP_Shutdown(NPError* error)
{
    PLUGIN_LOG_DEBUG_METHOD;

    if (mShutdown) {
        *error = NPERR_GENERIC_ERROR;
        return NS_ERROR_FAILURE;
    }

    bool ok = CallNP_Shutdown(error);

    // if NP_Shutdown() is nested within another RPC call, this will
    // break things.  but lord help us if we're doing that anyway; the
    // plugin dso will have been unloaded on the other side by the
    // CallNP_Shutdown() message
    Close();

    return ok ? NS_OK : NS_ERROR_FAILURE;
}

nsresult
PluginModuleParent::NP_GetMIMEDescription(const char** mimeDesc)
{
    PLUGIN_LOG_DEBUG_METHOD;

    *mimeDesc = "application/x-foobar";
    return NS_OK;
}

nsresult
PluginModuleParent::NP_GetValue(void *future, NPPVariable aVariable,
                                   void *aValue, NPError* error)
{
    PR_LOG(GetPluginLog(), PR_LOG_WARNING, ("%s Not implemented, requested variable %i", __FUNCTION__,
                                        (int) aVariable));

    //TODO: implement this correctly
    *error = NPERR_GENERIC_ERROR;
    return NS_OK;
}

#if defined(XP_WIN) || defined(XP_MACOSX)
nsresult
PluginModuleParent::NP_GetEntryPoints(NPPluginFuncs* pFuncs, NPError* error)
{
    NS_ASSERTION(pFuncs, "Null pointer!");

    // We need to have the child process update its function table
    // here by actually calling NP_GetEntryPoints since the parent's
    // function table can reflect NULL entries in the child's table.
    if (!CallNP_GetEntryPoints(error)) {
        return NS_ERROR_FAILURE;
    }
    else if (*error != NPERR_NO_ERROR) {
        return NS_OK;
    }

    SetPluginFuncs(pFuncs);

    return NS_OK;
}
#endif

nsresult
PluginModuleParent::NPP_New(NPMIMEType pluginType, NPP instance,
                            uint16_t mode, int16_t argc, char* argn[],
                            char* argv[], NPSavedData* saved,
                            NPError* error)
{
    PLUGIN_LOG_DEBUG_METHOD;

    if (mShutdown) {
        *error = NPERR_GENERIC_ERROR;
        return NS_ERROR_FAILURE;
    }

    // create the instance on the other side
    InfallibleTArray<nsCString> names;
    InfallibleTArray<nsCString> values;

    for (int i = 0; i < argc; ++i) {
        names.AppendElement(NullableString(argn[i]));
        values.AppendElement(NullableString(argv[i]));
    }

    PluginInstanceParent* parentInstance =
        new PluginInstanceParent(this, instance,
                                 nsDependentCString(pluginType), mNPNIface);

    if (!parentInstance->Init()) {
        delete parentInstance;
        return NS_ERROR_FAILURE;
    }

    instance->pdata = parentInstance;

    if (!CallPPluginInstanceConstructor(parentInstance,
                                        nsDependentCString(pluginType), mode,
                                        names, values, error)) {
        // |parentInstance| is automatically deleted.
        instance->pdata = nullptr;
        // if IPC is down, we'll get an immediate "failed" return, but
        // without *error being set.  So make sure that the error
        // condition is signaled to nsNPAPIPluginInstance
        if (NPERR_NO_ERROR == *error)
            *error = NPERR_GENERIC_ERROR;
        return NS_ERROR_FAILURE;
    }

    if (*error != NPERR_NO_ERROR) {
        NPP_Destroy(instance, 0);
        return NS_ERROR_FAILURE;
    }

    TimeoutChanged(kParentTimeoutPref, this);
    
    return NS_OK;
}

nsresult
PluginModuleParent::NPP_ClearSiteData(const char* site, uint64_t flags,
                                      uint64_t maxAge)
{
    if (!mClearSiteDataSupported)
        return NS_ERROR_NOT_AVAILABLE;

    NPError result;
    if (!CallNPP_ClearSiteData(NullableString(site), flags, maxAge, &result))
        return NS_ERROR_FAILURE;

    switch (result) {
    case NPERR_NO_ERROR:
        return NS_OK;
    case NPERR_TIME_RANGE_NOT_SUPPORTED:
        return NS_ERROR_PLUGIN_TIME_RANGE_NOT_SUPPORTED;
    case NPERR_MALFORMED_SITE:
        return NS_ERROR_INVALID_ARG;
    default:
        return NS_ERROR_FAILURE;
    }
}

nsresult
PluginModuleParent::NPP_GetSitesWithData(InfallibleTArray<nsCString>& result)
{
    if (!mGetSitesWithDataSupported)
        return NS_ERROR_NOT_AVAILABLE;

    if (!CallNPP_GetSitesWithData(&result))
        return NS_ERROR_FAILURE;

    return NS_OK;
}

#if defined(XP_MACOSX)
nsresult
PluginModuleParent::IsRemoteDrawingCoreAnimation(NPP instance, bool *aDrawing)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->IsRemoteDrawingCoreAnimation(aDrawing);
}

nsresult
PluginModuleParent::ContentsScaleFactorChanged(NPP instance, double aContentsScaleFactor)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NS_ERROR_FAILURE;

    return i->ContentsScaleFactorChanged(aContentsScaleFactor);
}
#endif // #if defined(XP_MACOSX)

bool
PluginModuleParent::AnswerNPN_GetValue_WithBoolReturn(const NPNVariable& aVariable,
                                                      NPError* aError,
                                                      bool* aBoolVal)
{
    NPBool boolVal = false;
    *aError = mozilla::plugins::parent::_getvalue(nullptr, aVariable, &boolVal);
    *aBoolVal = boolVal ? true : false;
    return true;
}

#if defined(MOZ_WIDGET_QT)
static const int kMaxtimeToProcessEvents = 30;
bool
PluginModuleParent::AnswerProcessSomeEvents()
{
    PLUGIN_LOG_DEBUG(("Spinning mini nested loop ..."));
    QCoreApplication::processEvents(QEventLoop::AllEvents, kMaxtimeToProcessEvents);

    PLUGIN_LOG_DEBUG(("... quitting mini nested loop"));

    return true;
}

#elif defined(XP_MACOSX)
bool
PluginModuleParent::AnswerProcessSomeEvents()
{
    mozilla::plugins::PluginUtilsOSX::InvokeNativeEventLoop();
    return true;
}

#elif !defined(MOZ_WIDGET_GTK)
bool
PluginModuleParent::AnswerProcessSomeEvents()
{
    NS_RUNTIMEABORT("unreached");
    return false;
}

#else
static const int kMaxChancesToProcessEvents = 20;

bool
PluginModuleParent::AnswerProcessSomeEvents()
{
    PLUGIN_LOG_DEBUG(("Spinning mini nested loop ..."));

    int i = 0;
    for (; i < kMaxChancesToProcessEvents; ++i)
        if (!g_main_context_iteration(NULL, FALSE))
            break;

    PLUGIN_LOG_DEBUG(("... quitting mini nested loop; processed %i tasks", i));

    return true;
}
#endif

bool
PluginModuleParent::RecvProcessNativeEventsInRPCCall()
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(OS_WIN)
    ProcessNativeEventsInRPCCall();
    return true;
#else
    NS_NOTREACHED(
        "PluginModuleParent::RecvProcessNativeEventsInRPCCall not implemented!");
    return false;
#endif
}

void
PluginModuleParent::ProcessRemoteNativeEventsInRPCCall()
{
#if defined(OS_WIN)
    unused << SendProcessNativeEventsInRPCCall();
    return;
#endif
    NS_NOTREACHED(
        "PluginModuleParent::ProcessRemoteNativeEventsInRPCCall not implemented!");
}

bool
PluginModuleParent::RecvPluginShowWindow(const uint32_t& aWindowId, const bool& aModal,
                                         const int32_t& aX, const int32_t& aY,
                                         const size_t& aWidth, const size_t& aHeight)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    CGRect windowBound = ::CGRectMake(aX, aY, aWidth, aHeight);
    mac_plugin_interposing::parent::OnPluginShowWindow(aWindowId, windowBound, aModal);
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvPluginShowWindow not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvPluginHideWindow(const uint32_t& aWindowId)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    mac_plugin_interposing::parent::OnPluginHideWindow(aWindowId, OtherSidePID());
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvPluginHideWindow not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvSetCursor(const NSCursorInfo& aCursorInfo)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    mac_plugin_interposing::parent::OnSetCursor(aCursorInfo);
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvSetCursor not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvShowCursor(const bool& aShow)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    mac_plugin_interposing::parent::OnShowCursor(aShow);
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvShowCursor not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvPushCursor(const NSCursorInfo& aCursorInfo)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    mac_plugin_interposing::parent::OnPushCursor(aCursorInfo);
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvPushCursor not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvPopCursor()
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    mac_plugin_interposing::parent::OnPopCursor();
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvPopCursor not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvGetNativeCursorsSupported(bool* supported)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));
#if defined(XP_MACOSX)
    *supported =
      Preferences::GetBool("dom.ipc.plugins.nativeCursorSupport", false);
    return true;
#else
    NS_NOTREACHED(
        "PluginInstanceParent::RecvGetNativeCursorSupportLevel not implemented!");
    return false;
#endif
}

bool
PluginModuleParent::RecvNPN_SetException(PPluginScriptableObjectParent* aActor,
                                         const nsCString& aMessage)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));

    NPObject* aNPObj = NULL;
    if (aActor) {
        aNPObj = static_cast<PluginScriptableObjectParent*>(aActor)->GetObject(true);
        if (!aNPObj) {
            NS_ERROR("Failed to get object!");
            return false;
        }
    }
    mozilla::plugins::parent::_setexception(aNPObj, NullableStringGet(aMessage));
    return true;
}

bool
PluginModuleParent::RecvNPN_ReloadPlugins(const bool& aReloadPages)
{
    PLUGIN_LOG_DEBUG(("%s", FULLFUNCTION));

    mozilla::plugins::parent::_reloadplugins(aReloadPages);
    return true;
}
