gecko-dev/dom/file/ipc/IPCBlobUtils.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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 "IPCBlobUtils.h"
#include "IPCBlobInputStream.h"
#include "IPCBlobInputStreamChild.h"
#include "IPCBlobInputStreamParent.h"
#include "IPCBlobInputStreamStorage.h"
#include "mozilla/dom/IPCBlob.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozilla/ipc/PBackgroundParent.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/ipc/IPCStreamUtils.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "StreamBlobImpl.h"
#include "prtime.h"

namespace mozilla {

using namespace ipc;

namespace dom {
namespace IPCBlobUtils {

already_AddRefed<BlobImpl>
Deserialize(const IPCBlob& aIPCBlob)
{
  nsCOMPtr<nsIInputStream> inputStream;

  const IPCBlobStream& stream = aIPCBlob.inputStream();
  switch (stream.type()) {

  // Parent to child: when an nsIInputStream is sent from parent to child, the
  // child receives a IPCBlobInputStream actor.
  case IPCBlobStream::TPIPCBlobInputStreamChild: {
    IPCBlobInputStreamChild* actor =
      static_cast<IPCBlobInputStreamChild*>(stream.get_PIPCBlobInputStreamChild());
    inputStream = actor->CreateStream();
    break;
  }

  // Child to Parent: when a blob is created on the content process send it's
  // sent to the parent, we have an IPCStream object.
  case IPCBlobStream::TIPCStream:
    MOZ_ASSERT(XRE_IsParentProcess());
    inputStream = DeserializeIPCStream(stream.get_IPCStream());
    break;

  default:
    MOZ_CRASH("Unknown type.");
    break;
  }

  MOZ_ASSERT(inputStream);

  RefPtr<StreamBlobImpl> blobImpl;

  if (aIPCBlob.file().type() == IPCFileUnion::Tvoid_t) {
    blobImpl = StreamBlobImpl::Create(inputStream.forget(),
                                      aIPCBlob.type(),
                                      aIPCBlob.size());
  } else {
    const IPCFile& file = aIPCBlob.file().get_IPCFile();
    blobImpl = StreamBlobImpl::Create(inputStream.forget(),
                                      file.name(),
                                      aIPCBlob.type(),
                                      file.lastModified(),
                                      aIPCBlob.size());
    blobImpl->SetDOMPath(file.DOMPath());
    blobImpl->SetFullPath(file.fullPath());
    blobImpl->SetIsDirectory(file.isDirectory());
  }

  blobImpl->SetFileId(aIPCBlob.fileId());

  return blobImpl.forget();
}

template<typename M>
nsresult
SerializeInputStreamParent(nsIInputStream* aInputStream, uint64_t aSize,
                           uint64_t aChildID, IPCBlob& aIPCBlob, M* aManager)
{
  // Parent to Child we always send a IPCBlobInputStream.
  MOZ_ASSERT(XRE_IsParentProcess());

  nsCOMPtr<nsIInputStream> stream = aInputStream;

  // In case this is a IPCBlobInputStream, we don't want to create a loop:
  // IPCBlobInputStreamParent -> IPCBlobInputStream ->
  // IPCBlobInputStreamParent. Let's use the underlying inputStream instead.
  nsCOMPtr<nsIIPCBlobInputStream> ipcBlobInputStream =
    do_QueryInterface(aInputStream);
  if (ipcBlobInputStream) {
    stream = ipcBlobInputStream->GetInternalStream();
    // If we don't have an underlying stream, it's better to terminate here
    // instead of sending an 'empty' IPCBlobInputStream actor on the other side,
    // unable to be used.
    if (NS_WARN_IF(!stream)) {
      return NS_ERROR_FAILURE;
    }
  }

  nsresult rv;
  RefPtr<IPCBlobInputStreamParent> parentActor =
    IPCBlobInputStreamParent::Create(stream, aSize, aChildID, &rv, aManager);
  if (!parentActor) {
    return rv;
  }

  // We need manually to increase the reference for this actor because the
  // IPC allocator method is not triggered. The Release() is called by IPDL
  // when the actor is deleted.
  parentActor.get()->AddRef();

  if (!aManager->SendPIPCBlobInputStreamConstructor(parentActor,
                                                    parentActor->ID(),
                                                    parentActor->Size())) {
    return NS_ERROR_FAILURE;
  }

  aIPCBlob.inputStream() = parentActor;
  return NS_OK;
}

template<typename M>
nsresult
SerializeInputStreamChild(nsIInputStream* aInputStream, IPCBlob& aIPCBlob,
                          M* aManager)
{
  AutoIPCStream ipcStream(true /* delayed start */);
  if (!ipcStream.Serialize(aInputStream, aManager)) {
    return NS_ERROR_FAILURE;
  }

  aIPCBlob.inputStream() = ipcStream.TakeValue();
  return NS_OK;
}

nsresult
SerializeInputStream(nsIInputStream* aInputStream, uint64_t aSize,
                     uint64_t aChildID, IPCBlob& aIPCBlob,
                     nsIContentParent* aManager)
{
  return SerializeInputStreamParent(aInputStream, aSize, aChildID, aIPCBlob,
                                    aManager);
}

nsresult
SerializeInputStream(nsIInputStream* aInputStream, uint64_t aSize,
                     uint64_t aChildID, IPCBlob& aIPCBlob,
                     PBackgroundParent* aManager)
{
  return SerializeInputStreamParent(aInputStream, aSize, aChildID, aIPCBlob,
                                    aManager);
}

nsresult
SerializeInputStream(nsIInputStream* aInputStream, uint64_t aSize,
                     uint64_t aChildID, IPCBlob& aIPCBlob,
                     nsIContentChild* aManager)
{
  return SerializeInputStreamChild(aInputStream, aIPCBlob, aManager);
}

nsresult
SerializeInputStream(nsIInputStream* aInputStream, uint64_t aSize,
                     uint64_t aChildID, IPCBlob& aIPCBlob,
                     PBackgroundChild* aManager)
{
  return SerializeInputStreamChild(aInputStream, aIPCBlob, aManager);
}

uint64_t
ChildIDFromManager(nsIContentParent* aManager)
{
  return aManager->ChildID();
}

uint64_t
ChildIDFromManager(PBackgroundParent* aManager)
{
  return BackgroundParent::GetChildID(aManager);
}

uint64_t
ChildIDFromManager(nsIContentChild* aManager)
{
  return 0;
}

uint64_t
ChildIDFromManager(PBackgroundChild* aManager)
{
  return 0;
}

template<typename M>
nsresult
SerializeInternal(BlobImpl* aBlobImpl, M* aManager, IPCBlob& aIPCBlob)
{
  MOZ_ASSERT(aBlobImpl);

  nsAutoString value;
  aBlobImpl->GetType(value);
  aIPCBlob.type() = value;

  ErrorResult rv;
  aIPCBlob.size() = aBlobImpl->GetSize(rv);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  if (!aBlobImpl->IsFile()) {
    aIPCBlob.file() = void_t();
  } else {
    IPCFile file;

    aBlobImpl->GetName(value);
    file.name() = value;

    file.lastModified() = aBlobImpl->GetLastModified(rv) * PR_USEC_PER_MSEC;
    if (NS_WARN_IF(rv.Failed())) {
      return rv.StealNSResult();
    }

    aBlobImpl->GetDOMPath(value);
    file.DOMPath() = value;

    aBlobImpl->GetMozFullPathInternal(value, rv);
    if (NS_WARN_IF(rv.Failed())) {
      return rv.StealNSResult();
    }
    file.fullPath() = value;

    file.isDirectory() = aBlobImpl->IsDirectory();

    aIPCBlob.file() = file;
  }

  aIPCBlob.fileId() = aBlobImpl->GetFileId();

  nsCOMPtr<nsIInputStream> inputStream;
  aBlobImpl->CreateInputStream(getter_AddRefs(inputStream), rv);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  rv = SerializeInputStream(inputStream, aIPCBlob.size(),
                            ChildIDFromManager(aManager), aIPCBlob, aManager);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  return NS_OK;
}

nsresult
Serialize(BlobImpl* aBlobImpl, nsIContentChild* aManager, IPCBlob& aIPCBlob)
{
  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
}

nsresult
Serialize(BlobImpl* aBlobImpl, PBackgroundChild* aManager, IPCBlob& aIPCBlob)
{
  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
}

nsresult
Serialize(BlobImpl* aBlobImpl, nsIContentParent* aManager, IPCBlob& aIPCBlob)
{
  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
}

nsresult
Serialize(BlobImpl* aBlobImpl, PBackgroundParent* aManager, IPCBlob& aIPCBlob)
{
  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
}

nsresult
SerializeUntyped(BlobImpl* aBlobImpl, IProtocol* aActor, IPCBlob& aIPCBlob)
{
  // We always want to act on the toplevel protocol.
  IProtocol* manager = aActor;
  while (manager->Manager()) {
    manager = manager->Manager();
  }

  // We always need the toplevel protocol
  switch(manager->GetProtocolTypeId()) {
  case PBackgroundMsgStart:
    if (manager->GetSide() == mozilla::ipc::ParentSide) {
      return SerializeInternal(aBlobImpl,
                               static_cast<PBackgroundParent*>(manager),
                               aIPCBlob);
    } else {
      return SerializeInternal(aBlobImpl,
                               static_cast<PBackgroundChild*>(manager),
                               aIPCBlob);
    }
  case PContentMsgStart:
    if (manager->GetSide() == mozilla::ipc::ParentSide) {
      return SerializeInternal(aBlobImpl,
                               static_cast<ContentParent*>(manager),
                               aIPCBlob);
    } else {
      return SerializeInternal(aBlobImpl,
                               static_cast<ContentChild*>(manager),
                               aIPCBlob);
    }
  default:
    MOZ_CRASH("Unsupported protocol passed to BlobImpl serialize");
  }
}

} // IPCBlobUtils namespace
} // dom namespace

namespace ipc {
void
IPDLParamTraits<mozilla::dom::BlobImpl>::Write(
  IPC::Message* aMsg, IProtocol* aActor,
  mozilla::dom::BlobImpl* aParam)
{
  nsresult rv;
  mozilla::dom::IPCBlob ipcblob;
  if (aParam) {
    rv = mozilla::dom::IPCBlobUtils::SerializeUntyped(aParam, aActor, ipcblob);
  }
  if (!aParam || NS_WARN_IF(NS_FAILED(rv))) {
    WriteIPDLParam(aMsg, aActor, false);
  } else {
    WriteIPDLParam(aMsg, aActor, true);
    WriteIPDLParam(aMsg, aActor, ipcblob);
  }
}

bool
IPDLParamTraits<mozilla::dom::BlobImpl>::Read(
  const IPC::Message* aMsg, PickleIterator* aIter,
  IProtocol* aActor, RefPtr<mozilla::dom::BlobImpl>* aResult)
{
  *aResult = nullptr;

  bool notnull = false;
  if (!ReadIPDLParam(aMsg, aIter, aActor, &notnull)) {
    return false;
  }
  if (notnull) {
    mozilla::dom::IPCBlob ipcblob;
    if (!ReadIPDLParam(aMsg, aIter, aActor, &ipcblob)) {
      return false;
    }
    *aResult = mozilla::dom::IPCBlobUtils::Deserialize(ipcblob);
  }
  return true;
}
} // ipc namespace
} // mozilla namespace