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PrivateBrowsingChannel

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

#ifndef mozilla_net_PrivateBrowsingChannel_h__
#define mozilla_net_PrivateBrowsingChannel_h__

#include "nsIPrivateBrowsingChannel.h"
#include "nsCOMPtr.h"
#include "nsILoadGroup.h"
#include "nsILoadContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIInterfaceRequestor.h"
#include "nsNetUtil.h"
#include "mozilla/Unused.h"

namespace mozilla {
namespace net {

template <class Channel>
class PrivateBrowsingChannel : public nsIPrivateBrowsingChannel
{
public:
  PrivateBrowsingChannel() :
    mPrivateBrowsingOverriden(false),
    mPrivateBrowsing(false)
  {
  }

  NS_IMETHOD SetPrivate(bool aPrivate)
  {
      // Make sure that we don't have a load context
      // This is a fatal error in debug builds, and a runtime error in release
      // builds.
      nsCOMPtr<nsILoadContext> loadContext;
      NS_QueryNotificationCallbacks(static_cast<Channel*>(this), loadContext);
      MOZ_ASSERT(!loadContext);
      if (loadContext) {
          return NS_ERROR_FAILURE;
      }

      mPrivateBrowsingOverriden = true;
      mPrivateBrowsing = aPrivate;
      return NS_OK;
  }

  NS_IMETHOD GetIsChannelPrivate(bool *aResult)
  {
      NS_ENSURE_ARG_POINTER(aResult);
      *aResult = mPrivateBrowsing;
      return NS_OK;
  }

  NS_IMETHOD IsPrivateModeOverriden(bool* aValue, bool *aResult)
  {
      NS_ENSURE_ARG_POINTER(aValue);
      NS_ENSURE_ARG_POINTER(aResult);
      *aResult = mPrivateBrowsingOverriden;
      if (mPrivateBrowsingOverriden) {
          *aValue = mPrivateBrowsing;
      }
      return NS_OK;
  }

  // Must be called every time the channel's callbacks or loadGroup is updated
  void UpdatePrivateBrowsing()
  {
      // once marked as private we never go un-private
      if (mPrivateBrowsing) {
          return;
      }

      auto channel = static_cast<Channel*>(this);

      nsCOMPtr<nsILoadContext> loadContext;
      NS_QueryNotificationCallbacks(channel, loadContext);
      if (loadContext) {
          mPrivateBrowsing = loadContext->UsePrivateBrowsing();
          return;
      }

      nsCOMPtr<nsILoadInfo> loadInfo;
      Unused << channel->GetLoadInfo(getter_AddRefs(loadInfo));
      if (loadInfo) {
          OriginAttributes attrs = loadInfo->GetOriginAttributes();
          mPrivateBrowsing = attrs.mPrivateBrowsingId > 0;
      }
  }

  bool CanSetCallbacks(nsIInterfaceRequestor* aCallbacks) const
  {
      // Make sure that the private bit override flag is not set.
      // This is a fatal error in debug builds, and a runtime error in release
      // builds.
      if (!aCallbacks) {
          return true;
      }
      nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(aCallbacks);
      if (!loadContext) {
          return true;
      }
      MOZ_ASSERT(!mPrivateBrowsingOverriden);
      return !mPrivateBrowsingOverriden;
  }

  bool CanSetLoadGroup(nsILoadGroup* aLoadGroup) const
  {
      // Make sure that the private bit override flag is not set.
      // This is a fatal error in debug builds, and a runtime error in release
      // builds.
      if (!aLoadGroup) {
          return true;
      }
      nsCOMPtr<nsIInterfaceRequestor> callbacks;
      aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
      // From this point on, we just hand off the work to CanSetCallbacks,
      // because the logic is exactly the same.
      return CanSetCallbacks(callbacks);
  }

protected:
  bool mPrivateBrowsingOverriden;
  bool mPrivateBrowsing;
};

} // namespace net
} // namespace mozilla

#endif