dom/file/ipc/TemporaryIPCBlobParent.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "private/pprio.h"
   8 #include "TemporaryIPCBlobParent.h"
   9 #include "mozilla/dom/FileBlobImpl.h"
  10 #include "nsAnonymousTemporaryFile.h"
  11 #include "TemporaryFileBlobImpl.h"
  12 #include "mozilla/dom/IPCBlobUtils.h"
  13
  14 namespace mozilla::dom {
  15
  16 TemporaryIPCBlobParent::TemporaryIPCBlobParent() : mActive(true) {}
  17
  18 TemporaryIPCBlobParent::~TemporaryIPCBlobParent() {
  19   // If we still have mFile, let's remove it.
  20   if (mFile) {
  21     mFile->Remove(false);
  22   }
  23 }
  24
  25 mozilla::ipc::IPCResult TemporaryIPCBlobParent::CreateAndShareFile() {
  26   MOZ_ASSERT(mActive);
  27   MOZ_ASSERT(!mFile);
  28
  29   nsresult rv = NS_OpenAnonymousTemporaryNsIFile(getter_AddRefs(mFile));
  30   if (NS_WARN_IF(NS_FAILED(rv))) {
  31     return SendDeleteError(rv);
  32   }
  33
  34   PRFileDesc* fd;
  35   rv = mFile->OpenNSPRFileDesc(PR_RDWR, PR_IRWXU, &fd);
  36   if (NS_WARN_IF(NS_FAILED(rv))) {
  37     return SendDeleteError(rv);
  38   }
  39
  40   FileDescriptor fdd = FileDescriptor(
  41       FileDescriptor::PlatformHandleType(PR_FileDesc2NativeHandle(fd)));
  42
  43   // The FileDescriptor object owns a duplicate of the file handle; we
  44   // must close the original (and clean up the NSPR descriptor).
  45   PR_Close(fd);
  46
  47   (void)SendFileDesc(fdd);
  48   return IPC_OK();
  49 }
  50
  51 mozilla::ipc::IPCResult TemporaryIPCBlobParent::RecvOperationFailed() {
  52   MOZ_ASSERT(mActive);
  53   mActive = false;
  54
  55   // Nothing to do.
  56   (void)Send__delete__(this, NS_ERROR_FAILURE);
  57   return IPC_OK();
  58 }
  59
  60 mozilla::ipc::IPCResult TemporaryIPCBlobParent::RecvOperationDone(
  61     const nsCString& aContentType, const FileDescriptor& aFD) {
  62   MOZ_ASSERT(mActive);
  63   mActive = false;
  64
  65   // We have received a file descriptor because in this way we have kept the
  66   // file locked on windows during the IPC communication. After the creation of
  67   // the TemporaryFileBlobImpl, this prfile can be closed.
  68   auto rawFD = aFD.ClonePlatformHandle();
  69   PRFileDesc* prfile = PR_ImportFile(PROsfd(rawFD.release()));
  70
  71   // Let's create the BlobImpl.
  72   nsCOMPtr<nsIFile> file = std::move(mFile);
  73
  74   RefPtr<TemporaryFileBlobImpl> blobImpl =
  75       new TemporaryFileBlobImpl(file, NS_ConvertUTF8toUTF16(aContentType));
  76
  77   PR_Close(prfile);
  78
  79   IPCBlob ipcBlob;
  80   nsresult rv = IPCBlobUtils::Serialize(blobImpl, ipcBlob);
  81   if (NS_WARN_IF(NS_FAILED(rv))) {
  82     (void)Send__delete__(this, NS_ERROR_FAILURE);
  83     return IPC_OK();
  84   }
  85
  86   (void)Send__delete__(this, ipcBlob);
  87   return IPC_OK();
  88 }
  89
  90 void TemporaryIPCBlobParent::ActorDestroy(ActorDestroyReason aWhy) {
  91   mActive = false;
  92 }
  93
  94 mozilla::ipc::IPCResult TemporaryIPCBlobParent::SendDeleteError(nsresult aRv) {
  95   MOZ_ASSERT(mActive);
  96   mActive = false;
  97
  98   (void)Send__delete__(this, aRv);
  99   return IPC_OK();
 100 }
 101
 102 }  // namespace mozilla::dom