/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et 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 "nsContentSecurityManager.h"
#include "nsContentUtils.h"
#include "RtspChannelChild.h"
#include "mozilla/ipc/URIUtils.h"
#include "nsServiceManagerUtils.h"

using namespace mozilla::ipc;

namespace mozilla {
namespace net {

//-----------------------------------------------------------------------------
// RtspChannelChild
//-----------------------------------------------------------------------------
RtspChannelChild::RtspChannelChild(nsIURI *aUri)
  : mIPCOpen(false)
  , mCanceled(false)
{
  nsBaseChannel::SetURI(aUri);
  DisallowThreadRetargeting();
}

RtspChannelChild::~RtspChannelChild()
{
}

nsIStreamingProtocolController*
RtspChannelChild::GetController()
{
  return mMediaStreamController;
}

void
RtspChannelChild::ReleaseController()
{
  if (mMediaStreamController) {
    mMediaStreamController = nullptr;
  }
}

//-----------------------------------------------------------------------------
// IPDL
//-----------------------------------------------------------------------------
void
RtspChannelChild::AddIPDLReference()
{
  MOZ_ASSERT(!mIPCOpen,
             "Attempt to retain more than one IPDL reference");
  mIPCOpen = true;
  AddRef();
}

void
RtspChannelChild::ReleaseIPDLReference()
{
  MOZ_ASSERT(mIPCOpen, "Attempt to release nonexistent IPDL reference");
  mIPCOpen = false;
  Release();
}

//-----------------------------------------------------------------------------
// nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS_INHERITED(RtspChannelChild,
                            nsBaseChannel,
                            nsIChannel,
                            nsIChildChannel)

//-----------------------------------------------------------------------------
// nsBaseChannel::nsIChannel
//-----------------------------------------------------------------------------
NS_IMETHODIMP
RtspChannelChild::GetContentType(nsACString& aContentType)
{
  aContentType.AssignLiteral("RTSP");
  return NS_OK;
}

class CallListenerOnStartRequestEvent : public nsRunnable
{
public:
  CallListenerOnStartRequestEvent(nsIStreamListener *aListener,
                                  nsIRequest *aRequest, nsISupports *aContext)
    : mListener(aListener)
    , mRequest(aRequest)
    , mContext(aContext)
  {
    MOZ_RELEASE_ASSERT(aListener);
  }
  NS_IMETHOD Run()
  {
    MOZ_ASSERT(NS_IsMainThread());
    mListener->OnStartRequest(mRequest, mContext);
    return NS_OK;
  }
private:
  RefPtr<nsIStreamListener> mListener;
  RefPtr<nsIRequest> mRequest;
  RefPtr<nsISupports> mContext;
};

NS_IMETHODIMP
RtspChannelChild::AsyncOpen(nsIStreamListener *aListener, nsISupports *aContext)
{
  MOZ_ASSERT(!mLoadInfo ||
             mLoadInfo->GetSecurityMode() == 0 ||
             mLoadInfo->GetInitialSecurityCheckDone() ||
             (mLoadInfo->GetSecurityMode() == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL &&
              nsContentUtils::IsSystemPrincipal(mLoadInfo->LoadingPrincipal())),
             "security flags in loadInfo but asyncOpen2() not called");

  // Precondition checks.
  MOZ_ASSERT(aListener);
  nsCOMPtr<nsIURI> uri = nsBaseChannel::URI();
  NS_ENSURE_TRUE(uri, NS_ERROR_ILLEGAL_VALUE);

  // Create RtspController.
  nsCOMPtr<nsIStreamingProtocolControllerService> mediaControllerService =
    do_GetService(MEDIASTREAMCONTROLLERSERVICE_CONTRACTID);
  MOZ_RELEASE_ASSERT(mediaControllerService,
    "Cannot proceed if media controller service is unavailable!");
  mediaControllerService->Create(this, getter_AddRefs(mMediaStreamController));
  MOZ_ASSERT(mMediaStreamController);

  // Add ourselves to the load group.
  if (mLoadGroup) {
    mLoadGroup->AddRequest(this, nullptr);
  }

  // Dispatch mListener's OnStartRequest directly. mListener is expected to
  // create an RtspMediaResource and use the RtspController we just created to
  // manage the control and data streams to and from the network.
  mListener = aListener;
  mListenerContext = aContext;
  NS_DispatchToMainThread(
    new CallListenerOnStartRequestEvent(mListener, this, mListenerContext));

  return NS_OK;
}

NS_IMETHODIMP
RtspChannelChild::AsyncOpen2(nsIStreamListener *aListener)
{
  nsCOMPtr<nsIStreamListener> listener = aListener;
  nsresult rv = nsContentSecurityManager::doContentSecurityCheck(this, listener);
  NS_ENSURE_SUCCESS(rv, rv);
  return AsyncOpen(listener, nullptr);
}

//-----------------------------------------------------------------------------
// nsBaseChannel::nsIStreamListener::nsIRequestObserver
//-----------------------------------------------------------------------------
NS_IMETHODIMP
RtspChannelChild::OnStartRequest(nsIRequest *aRequest, nsISupports *aContext)
{
  MOZ_CRASH("Should never be called");
}

NS_IMETHODIMP
RtspChannelChild::OnStopRequest(nsIRequest *aRequest, nsISupports *aContext,
                                nsresult aStatusCode)
{
  MOZ_CRASH("Should never be called");
}

//-----------------------------------------------------------------------------
// nsBaseChannel::nsIStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
RtspChannelChild::OnDataAvailable(nsIRequest *aRequest,
                                  nsISupports *aContext,
                                  nsIInputStream *aInputStream,
                                  uint64_t aOffset,
                                  uint32_t aCount)
{
  MOZ_CRASH("Should never be called");
}

//-----------------------------------------------------------------------------
// nsBaseChannel::nsIChannel::nsIRequest
//-----------------------------------------------------------------------------
class CallListenerOnStopRequestEvent : public nsRunnable
{
public:
  CallListenerOnStopRequestEvent(nsIStreamListener *aListener,
                                 nsIRequest *aRequest,
                                 nsISupports *aContext, nsresult aStatus)
    : mListener(aListener)
    , mRequest(aRequest)
    , mContext(aContext)
    , mStatus(aStatus)
  {
    MOZ_RELEASE_ASSERT(aListener);
  }
  NS_IMETHOD Run()
  {
    MOZ_ASSERT(NS_IsMainThread());
    mListener->OnStopRequest(mRequest, mContext, mStatus);
    return NS_OK;
  }
private:
  RefPtr<nsIStreamListener> mListener;
  RefPtr<nsIRequest> mRequest;
  RefPtr<nsISupports> mContext;
  nsresult mStatus;
};

NS_IMETHODIMP
RtspChannelChild::Cancel(nsresult status)
{
  if (mCanceled) {
    return NS_OK;
  }

  mCanceled = true;
  // Stop RtspController.
  if (mMediaStreamController) {
    mMediaStreamController->Stop();
  }

  // Call mListener's OnStopRequest to do clean up.
  NS_DispatchToMainThread(
    new CallListenerOnStopRequestEvent(mListener, this,
                                       mListenerContext, status));
  mListener = nullptr;
  mListenerContext = nullptr;

  // Remove ourselves from the load group.
  if (mLoadGroup) {
    mLoadGroup->RemoveRequest(this, nullptr, status);
  }

  return NS_OK;
}

NS_IMETHODIMP
RtspChannelChild::Suspend()
{
  MOZ_CRASH("Should never be called");
}

NS_IMETHODIMP
RtspChannelChild::Resume()
{
  MOZ_CRASH("Should never be called");
}

//-----------------------------------------------------------------------------
// nsBaseChannel
//-----------------------------------------------------------------------------
NS_IMETHODIMP
RtspChannelChild::OpenContentStream(bool aAsync,
                                    nsIInputStream **aStream,
                                    nsIChannel **aChannel)
{
  MOZ_CRASH("Should never be called");
}

//-----------------------------------------------------------------------------
// nsIChildChannel
//-----------------------------------------------------------------------------
NS_IMETHODIMP
RtspChannelChild::ConnectParent(uint32_t id)
{
  // Create RtspChannelParent for redirection.
  AddIPDLReference();
  RtspChannelConnectArgs connectArgs;
  SerializeURI(nsBaseChannel::URI(), connectArgs.uri());
  connectArgs.channelId() = id;
  if (!gNeckoChild->SendPRtspChannelConstructor(this, connectArgs)) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

NS_IMETHODIMP
RtspChannelChild::CompleteRedirectSetup(nsIStreamListener *aListener,
                                        nsISupports *aContext)
{
  if (mLoadInfo && mLoadInfo->GetEnforceSecurity()) {
    MOZ_ASSERT(!aContext, "aContext should be null!");
    return AsyncOpen2(aListener);
  }
  return AsyncOpen(aListener, aContext);
}

} // namespace net
} // namespace mozilla