/* -*- 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 "GMPService.h"

#include "ChromiumCDMParent.h"
#include "GMPLog.h"
#include "GMPParent.h"
#include "GMPProcessParent.h"
#include "GMPServiceChild.h"
#include "GMPServiceParent.h"
#include "GMPVideoDecoderParent.h"
#include "GeckoChildProcessHost.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/PluginCrashedEvent.h"
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
#  include "mozilla/SandboxInfo.h"
#endif
#include "VideoUtils.h"
#include "mozilla/Services.h"
#include "mozilla/SyncRunnable.h"
#include "mozilla/Unused.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsComponentManagerUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsDirectoryServiceUtils.h"
#include "nsHashKeys.h"
#include "nsIObserverService.h"
#include "nsIXULAppInfo.h"
#include "nsNativeCharsetUtils.h"
#include "nsXPCOMPrivate.h"
#include "prio.h"
#include "runnable_utils.h"

namespace mozilla {

LogModule* GetGMPLog() {
  static LazyLogModule sLog("GMP");
  return sLog;
}

#ifdef __CLASS__
#  undef __CLASS__
#endif
#define __CLASS__ "GMPService"

namespace gmp {

static StaticRefPtr<GeckoMediaPluginService> sSingletonService;

class GMPServiceCreateHelper final : public mozilla::Runnable {
  RefPtr<GeckoMediaPluginService> mService;

 public:
  static already_AddRefed<GeckoMediaPluginService> GetOrCreate() {
    RefPtr<GeckoMediaPluginService> service;

    if (NS_IsMainThread()) {
      service = GetOrCreateOnMainThread();
    } else {
      RefPtr<GMPServiceCreateHelper> createHelper =
          new GMPServiceCreateHelper();

      mozilla::SyncRunnable::DispatchToThread(GetMainThreadSerialEventTarget(),
                                              createHelper, true);

      service = std::move(createHelper->mService);
    }

    return service.forget();
  }

 private:
  GMPServiceCreateHelper() : Runnable("GMPServiceCreateHelper") {}

  ~GMPServiceCreateHelper() { MOZ_ASSERT(!mService); }

  static already_AddRefed<GeckoMediaPluginService> GetOrCreateOnMainThread() {
    MOZ_ASSERT(NS_IsMainThread());

    if (!sSingletonService) {
      if (XRE_IsParentProcess()) {
        RefPtr<GeckoMediaPluginServiceParent> service =
            new GeckoMediaPluginServiceParent();
        service->Init();
        sSingletonService = service;
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
        // GMPProcessParent should only be instantiated in the parent
        // so initialization only needs to be done in the parent.
        GMPProcessParent::InitStaticMainThread();
#endif
      } else {
        RefPtr<GeckoMediaPluginServiceChild> service =
            new GeckoMediaPluginServiceChild();
        service->Init();
        sSingletonService = service;
      }
      ClearOnShutdown(&sSingletonService);
    }

    RefPtr<GeckoMediaPluginService> service = sSingletonService.get();
    return service.forget();
  }

  NS_IMETHOD
  Run() override {
    MOZ_ASSERT(NS_IsMainThread());

    mService = GetOrCreateOnMainThread();
    return NS_OK;
  }
};

already_AddRefed<GeckoMediaPluginService>
GeckoMediaPluginService::GetGeckoMediaPluginService() {
  return GMPServiceCreateHelper::GetOrCreate();
}

NS_IMPL_ISUPPORTS(GeckoMediaPluginService, mozIGeckoMediaPluginService,
                  nsIObserver)

GeckoMediaPluginService::GeckoMediaPluginService()
    : mMutex("GeckoMediaPluginService::mMutex"),
      mMainThread(GetMainThreadSerialEventTarget()),
      mGMPThreadShutdown(false),
      mShuttingDownOnGMPThread(false),
      mXPCOMWillShutdown(false) {
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIXULAppInfo> appInfo =
      do_GetService("@mozilla.org/xre/app-info;1");
  if (appInfo) {
    nsAutoCString version;
    nsAutoCString buildID;
    if (NS_SUCCEEDED(appInfo->GetVersion(version)) &&
        NS_SUCCEEDED(appInfo->GetAppBuildID(buildID))) {
      GMP_LOG_DEBUG(
          "GeckoMediaPluginService created; Gecko version=%s buildID=%s",
          version.get(), buildID.get());
    }
  }
}

GeckoMediaPluginService::~GeckoMediaPluginService() = default;

NS_IMETHODIMP
GeckoMediaPluginService::RunPluginCrashCallbacks(
    uint32_t aPluginId, const nsACString& aPluginName) {
  MOZ_ASSERT(NS_IsMainThread());
  GMP_LOG_DEBUG("%s::%s(%i)", __CLASS__, __FUNCTION__, aPluginId);

  mozilla::UniquePtr<nsTArray<RefPtr<GMPCrashHelper>>> helpers;
  {
    MutexAutoLock lock(mMutex);
    mPluginCrashHelpers.Remove(aPluginId, &helpers);
  }
  if (!helpers) {
    GMP_LOG_DEBUG("%s::%s(%i) No crash helpers, not handling crash.", __CLASS__,
                  __FUNCTION__, aPluginId);
    return NS_OK;
  }

  for (const auto& helper : *helpers) {
    nsCOMPtr<nsPIDOMWindowInner> window = helper->GetPluginCrashedEventTarget();
    if (NS_WARN_IF(!window)) {
      continue;
    }
    RefPtr<dom::Document> document(window->GetExtantDoc());
    if (NS_WARN_IF(!document)) {
      continue;
    }

    dom::PluginCrashedEventInit init;
    init.mPluginID = aPluginId;
    init.mBubbles = true;
    init.mCancelable = true;
    init.mGmpPlugin = true;
    CopyUTF8toUTF16(aPluginName, init.mPluginName);
    init.mSubmittedCrashReport = false;
    RefPtr<dom::PluginCrashedEvent> event =
        dom::PluginCrashedEvent::Constructor(document, u"PluginCrashed"_ns,
                                             init);
    event->SetTrusted(true);
    event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;

    EventDispatcher::DispatchDOMEvent(window, nullptr, event, nullptr, nullptr);
  }

  return NS_OK;
}

nsresult GeckoMediaPluginService::Init() {
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIObserverService> obsService =
      mozilla::services::GetObserverService();
  MOZ_ASSERT(obsService);
  MOZ_ALWAYS_SUCCEEDS(obsService->AddObserver(
      this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false));

  // Kick off scanning for plugins
  nsCOMPtr<nsIThread> thread;
  return GetThread(getter_AddRefs(thread));
}

RefPtr<GetCDMParentPromise> GeckoMediaPluginService::GetCDM(
    const NodeIdParts& aNodeIdParts, nsTArray<nsCString> aTags,
    GMPCrashHelper* aHelper) {
  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());

  if (mShuttingDownOnGMPThread || aTags.IsEmpty()) {
    nsPrintfCString reason(
        "%s::%s failed, aTags.IsEmpty() = %d, mShuttingDownOnGMPThread = %d.",
        __CLASS__, __FUNCTION__, aTags.IsEmpty(), mShuttingDownOnGMPThread);
    return GetCDMParentPromise::CreateAndReject(
        MediaResult(NS_ERROR_FAILURE, reason.get()), __func__);
  }

  typedef MozPromiseHolder<GetCDMParentPromise> PromiseHolder;
  PromiseHolder* rawHolder(new PromiseHolder());
  RefPtr<GetCDMParentPromise> promise = rawHolder->Ensure(__func__);
  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
  RefPtr<GMPCrashHelper> helper(aHelper);
  GetContentParent(aHelper, NodeIdVariant{aNodeIdParts},
                   nsLiteralCString(CHROMIUM_CDM_API), aTags)
      ->Then(
          thread, __func__,
          [rawHolder, helper](RefPtr<GMPContentParent::CloseBlocker> wrapper) {
            RefPtr<GMPContentParent> parent = wrapper->mParent;
            MOZ_ASSERT(
                parent,
                "Wrapper should wrap a valid parent if we're in this path.");
            UniquePtr<PromiseHolder> holder(rawHolder);
            RefPtr<ChromiumCDMParent> cdm = parent->GetChromiumCDM();
            if (!cdm) {
              nsPrintfCString reason(
                  "%s::%s failed since GetChromiumCDM returns nullptr.",
                  __CLASS__, __FUNCTION__);
              holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
                             __func__);
              return;
            }
            if (helper) {
              cdm->SetCrashHelper(helper);
            }
            holder->Resolve(cdm, __func__);
          },
          [rawHolder](MediaResult result) {
            nsPrintfCString reason(
                "%s::%s failed since GetContentParent rejects the promise with "
                "reason %s.",
                __CLASS__, __FUNCTION__, result.Description().get());
            UniquePtr<PromiseHolder> holder(rawHolder);
            holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
                           __func__);
          });

  return promise;
}

void GeckoMediaPluginService::ShutdownGMPThread() {
  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
  nsCOMPtr<nsIThread> gmpThread;
  {
    MutexAutoLock lock(mMutex);
    mGMPThreadShutdown = true;
    mGMPThread.swap(gmpThread);
  }

  if (gmpThread) {
    gmpThread->Shutdown();
  }
}

/* static */
nsCOMPtr<nsIAsyncShutdownClient> GeckoMediaPluginService::GetShutdownBarrier() {
  nsCOMPtr<nsIAsyncShutdownService> svc = services::GetAsyncShutdownService();
  MOZ_RELEASE_ASSERT(svc);

  nsCOMPtr<nsIAsyncShutdownClient> barrier;
  nsresult rv = svc->GetXpcomWillShutdown(getter_AddRefs(barrier));

  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
  MOZ_RELEASE_ASSERT(barrier);
  return barrier;
}

nsresult GeckoMediaPluginService::GMPDispatch(nsIRunnable* event,
                                              uint32_t flags) {
  nsCOMPtr<nsIRunnable> r(event);
  return GMPDispatch(r.forget());
}

nsresult GeckoMediaPluginService::GMPDispatch(
    already_AddRefed<nsIRunnable> event, uint32_t flags) {
  nsCOMPtr<nsIRunnable> r(event);
  nsCOMPtr<nsIThread> thread;
  nsresult rv = GetThread(getter_AddRefs(thread));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return thread->Dispatch(r, flags);
}

// always call with getter_AddRefs, because it does
NS_IMETHODIMP
GeckoMediaPluginService::GetThread(nsIThread** aThread) {
  MOZ_ASSERT(aThread);

  // This can be called from any thread.
  MutexAutoLock lock(mMutex);

  if (!mGMPThread) {
    // Don't allow the thread to be created after shutdown has started.
    if (mGMPThreadShutdown) {
      return NS_ERROR_FAILURE;
    }

    nsresult rv = NS_NewNamedThread("GMPThread", getter_AddRefs(mGMPThread));
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    // Tell the thread to initialize plugins
    InitializePlugins(mGMPThread);
  }

  nsCOMPtr<nsIThread> copy = mGMPThread;
  copy.forget(aThread);

  return NS_OK;
}

already_AddRefed<nsISerialEventTarget> GeckoMediaPluginService::GetGMPThread() {
  nsCOMPtr<nsISerialEventTarget> thread;
  {
    MutexAutoLock lock(mMutex);
    thread = mGMPThread;
  }
  return thread.forget();
}

NS_IMETHODIMP
GeckoMediaPluginService::GetDecryptingGMPVideoDecoder(
    GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
    const nsACString& aNodeId,
    UniquePtr<GetGMPVideoDecoderCallback>&& aCallback, uint32_t aDecryptorId) {
  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
  NS_ENSURE_ARG(aTags && aTags->Length() > 0);
  NS_ENSURE_ARG(aCallback);

  if (mShuttingDownOnGMPThread) {
    return NS_ERROR_FAILURE;
  }

  GetGMPVideoDecoderCallback* rawCallback = aCallback.release();
  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
  RefPtr<GMPCrashHelper> helper(aHelper);
  GetContentParent(aHelper, NodeIdVariant{nsCString(aNodeId)},
                   nsLiteralCString(GMP_API_VIDEO_DECODER), *aTags)
      ->Then(
          thread, __func__,
          [rawCallback, helper,
           aDecryptorId](RefPtr<GMPContentParent::CloseBlocker> wrapper) {
            RefPtr<GMPContentParent> parent = wrapper->mParent;
            UniquePtr<GetGMPVideoDecoderCallback> callback(rawCallback);
            GMPVideoDecoderParent* actor = nullptr;
            GMPVideoHostImpl* host = nullptr;
            if (parent && NS_SUCCEEDED(parent->GetGMPVideoDecoder(
                              &actor, aDecryptorId))) {
              host = &(actor->Host());
              actor->SetCrashHelper(helper);
            }
            callback->Done(actor, host);
          },
          [rawCallback] {
            UniquePtr<GetGMPVideoDecoderCallback> callback(rawCallback);
            callback->Done(nullptr, nullptr);
          });

  return NS_OK;
}

NS_IMETHODIMP
GeckoMediaPluginService::GetGMPVideoEncoder(
    GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
    const nsACString& aNodeId,
    UniquePtr<GetGMPVideoEncoderCallback>&& aCallback) {
  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
  NS_ENSURE_ARG(aTags && aTags->Length() > 0);
  NS_ENSURE_ARG(aCallback);

  if (mShuttingDownOnGMPThread) {
    return NS_ERROR_FAILURE;
  }

  GetGMPVideoEncoderCallback* rawCallback = aCallback.release();
  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
  RefPtr<GMPCrashHelper> helper(aHelper);
  GetContentParent(aHelper, NodeIdVariant{nsCString(aNodeId)},
                   nsLiteralCString(GMP_API_VIDEO_ENCODER), *aTags)
      ->Then(
          thread, __func__,
          [rawCallback,
           helper](RefPtr<GMPContentParent::CloseBlocker> wrapper) {
            RefPtr<GMPContentParent> parent = wrapper->mParent;
            UniquePtr<GetGMPVideoEncoderCallback> callback(rawCallback);
            GMPVideoEncoderParent* actor = nullptr;
            GMPVideoHostImpl* host = nullptr;
            if (parent && NS_SUCCEEDED(parent->GetGMPVideoEncoder(&actor))) {
              host = &(actor->Host());
              actor->SetCrashHelper(helper);
            }
            callback->Done(actor, host);
          },
          [rawCallback] {
            UniquePtr<GetGMPVideoEncoderCallback> callback(rawCallback);
            callback->Done(nullptr, nullptr);
          });

  return NS_OK;
}

void GeckoMediaPluginService::ConnectCrashHelper(uint32_t aPluginId,
                                                 GMPCrashHelper* aHelper) {
  if (!aHelper) {
    return;
  }
  MutexAutoLock lock(mMutex);
  nsTArray<RefPtr<GMPCrashHelper>>* helpers;
  if (!mPluginCrashHelpers.Get(aPluginId, &helpers)) {
    helpers = new nsTArray<RefPtr<GMPCrashHelper>>();
    mPluginCrashHelpers.Put(aPluginId, helpers);
  } else if (helpers->Contains(aHelper)) {
    return;
  }
  helpers->AppendElement(aHelper);
}

void GeckoMediaPluginService::DisconnectCrashHelper(GMPCrashHelper* aHelper) {
  if (!aHelper) {
    return;
  }
  MutexAutoLock lock(mMutex);
  for (auto iter = mPluginCrashHelpers.Iter(); !iter.Done(); iter.Next()) {
    nsTArray<RefPtr<GMPCrashHelper>>* helpers = iter.UserData();
    if (!helpers->Contains(aHelper)) {
      continue;
    }
    helpers->RemoveElement(aHelper);
    MOZ_ASSERT(!helpers->Contains(aHelper));  // Ensure there aren't duplicates.
    if (helpers->IsEmpty()) {
      iter.Remove();
    }
  }
}

}  // namespace gmp
}  // namespace mozilla

#undef __CLASS__