/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* 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 "SimpleChannel.h"

#include "nsBaseChannel.h"

#include "nsIChannel.h"

#include "nsIChildChannel.h"

#include "nsIInputStream.h"

#include "nsIRequest.h"

#include "nsISupportsImpl.h"

#include "nsNetUtil.h"

#include "mozilla/Unused.h"

#include "mozilla/dom/ContentChild.h"

#include "mozilla/net/NeckoChild.h"

#include "mozilla/net/PSimpleChannelChild.h"

namespace mozilla {

namespace net {

class SimpleChannel : public nsBaseChannel

{

public:

  explicit SimpleChannel(UniquePtr<SimpleChannelCallbacks>&& aCallbacks);

protected:

  virtual ~SimpleChannel() = default;

  virtual nsresult OpenContentStream(bool async, nsIInputStream **streamOut,

                                     nsIChannel** channel) override;

  virtual nsresult BeginAsyncRead(nsIStreamListener* listener,

                                  nsIRequest** request) override;

private:

  UniquePtr<SimpleChannelCallbacks> mCallbacks;

};

SimpleChannel::SimpleChannel(UniquePtr<SimpleChannelCallbacks>&& aCallbacks)

  : mCallbacks(std::move(aCallbacks))

{

  EnableSynthesizedProgressEvents(true);

}

nsresult

SimpleChannel::OpenContentStream(bool async, nsIInputStream **streamOut, nsIChannel** channel)

{

  NS_ENSURE_TRUE(mCallbacks, NS_ERROR_UNEXPECTED);

  nsCOMPtr<nsIInputStream> stream;

  MOZ_TRY_VAR(stream, mCallbacks->OpenContentStream(async, this));

  MOZ_ASSERT(stream);

  mCallbacks = nullptr;

  *channel = nullptr;

  stream.forget(streamOut);

  return NS_OK;

}

nsresult

SimpleChannel::BeginAsyncRead(nsIStreamListener* listener, nsIRequest** request)

{

  NS_ENSURE_TRUE(mCallbacks, NS_ERROR_UNEXPECTED);

  nsCOMPtr<nsIRequest> req;

  MOZ_TRY_VAR(req, mCallbacks->StartAsyncRead(listener, this));

  mCallbacks = nullptr;

  req.forget(request);

  return NS_OK;

}

class SimpleChannelChild final : public SimpleChannel

                               , public nsIChildChannel

                               , public PSimpleChannelChild

{

public:

  explicit SimpleChannelChild(UniquePtr<SimpleChannelCallbacks>&& aCallbacks);

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_NSICHILDCHANNEL

protected:

  virtual void ActorDestroy(ActorDestroyReason why) override;

private:

  virtual ~SimpleChannelChild() = default;

  void AddIPDLReference();

  RefPtr<SimpleChannelChild> mIPDLRef;

};

NS_IMPL_ISUPPORTS_INHERITED(SimpleChannelChild, SimpleChannel, nsIChildChannel)

SimpleChannelChild::SimpleChannelChild(UniquePtr<SimpleChannelCallbacks>&& aCallbacks)

  : SimpleChannel(std::move(aCallbacks))

  , mIPDLRef(nullptr)

{

}

NS_IMETHODIMP

SimpleChannelChild::ConnectParent(uint32_t aId)

{

  MOZ_ASSERT(NS_IsMainThread());

  mozilla::dom::ContentChild* cc =

    static_cast<mozilla::dom::ContentChild*>(gNeckoChild->Manager());

  if (cc->IsShuttingDown()) {

    return NS_ERROR_FAILURE;

  }

  if (!gNeckoChild->SendPSimpleChannelConstructor(this, aId)) {

    return NS_ERROR_FAILURE;

  }

  // IPC now has a ref to us.

  mIPDLRef = this;

  return NS_OK;

}

NS_IMETHODIMP

SimpleChannelChild::CompleteRedirectSetup(nsIStreamListener* aListener,

                                          nsISupports* aContext)

{

  if (mIPDLRef) {

    MOZ_ASSERT(NS_IsMainThread());

  }

  nsresult rv;

  if (mLoadInfo && mLoadInfo->GetEnforceSecurity()) {

    MOZ_ASSERT(!aContext, "aContext should be null!");

    rv = AsyncOpen2(aListener);

  } else {

    rv = AsyncOpen(aListener, aContext);

  }

  if (NS_WARN_IF(NS_FAILED(rv))) {

    return rv;

  }

  if (mIPDLRef) {

    Unused << Send__delete__(this);

  }

  return NS_OK;

}

void

SimpleChannelChild::ActorDestroy(ActorDestroyReason why)

{

  MOZ_ASSERT(mIPDLRef);

  mIPDLRef = nullptr;

}

already_AddRefed<nsIChannel>

NS_NewSimpleChannelInternal(nsIURI* aURI, nsILoadInfo* aLoadInfo, UniquePtr<SimpleChannelCallbacks>&& aCallbacks)

{

  RefPtr<SimpleChannel> chan;

  if (IsNeckoChild()) {

    chan = new SimpleChannelChild(std::move(aCallbacks));

  } else {

    chan = new SimpleChannel(std::move(aCallbacks));

  }

  chan->SetURI(aURI);

  MOZ_ALWAYS_SUCCEEDS(chan->SetLoadInfo(aLoadInfo));

  return chan.forget();

}

} // namespace net

} // namespace mozilla