root/content/browser/renderer_host/pepper/pepper_external_file_ref_backend.cc

DEFINITIONS

1. weak_factory_
2. MakeDirectory
3. Touch
4. Delete
5. Rename
6. Query
7. ReadDirectoryEntries
8. GetAbsolutePath
9. GetFileSystemURL
10. GetExternalFilePath
11. CanRead
12. CanWrite
13. CanCreate
14. CanReadWrite
15. DidFinish
16. GetMetadataComplete

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/pepper/pepper_external_file_ref_backend.h"

#include "base/files/file_path.h"
#include "base/files/file_util_proxy.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/public/browser/browser_thread.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_time.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/file_type_conversion.h"
#include "ppapi/shared_impl/time_conversion.h"

namespace content {

PepperExternalFileRefBackend::PepperExternalFileRefBackend(
    ppapi::host::PpapiHost* host,
    int render_process_id,
    const base::FilePath& path) : host_(host),
                                  path_(path),
                                  render_process_id_(render_process_id),
                                  weak_factory_(this) {
  task_runner_ =
      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE);
}

PepperExternalFileRefBackend::~PepperExternalFileRefBackend() {
}

int32_t PepperExternalFileRefBackend::MakeDirectory(
    ppapi::host::ReplyMessageContext reply_context,
    int32_t make_directory_flags) {
  // This operation isn't supported for external filesystems.
  return PP_ERROR_NOACCESS;
}

int32_t PepperExternalFileRefBackend::Touch(
    ppapi::host::ReplyMessageContext reply_context,
    PP_Time last_access_time,
    PP_Time last_modified_time) {
  IPC::Message reply_msg = PpapiPluginMsg_FileRef_TouchReply();
  base::FileUtilProxy::Touch(
      task_runner_.get(),
      path_,
      ppapi::PPTimeToTime(last_access_time),
      ppapi::PPTimeToTime(last_modified_time),
      base::Bind(&PepperExternalFileRefBackend::DidFinish,
                 weak_factory_.GetWeakPtr(),
                 reply_context,
                 reply_msg));
  return PP_OK_COMPLETIONPENDING;
}

int32_t PepperExternalFileRefBackend::Delete(
    ppapi::host::ReplyMessageContext reply_context) {
  // This operation isn't supported for external filesystems.
  return PP_ERROR_NOACCESS;
}

int32_t PepperExternalFileRefBackend::Rename(
    ppapi::host::ReplyMessageContext reply_context,
    PepperFileRefHost* new_file_ref) {
  // This operation isn't supported for external filesystems.
  return PP_ERROR_NOACCESS;
}

int32_t PepperExternalFileRefBackend::Query(
    ppapi::host::ReplyMessageContext reply_context) {
  bool ok = base::FileUtilProxy::GetFileInfo(
      task_runner_.get(),
      path_,
      base::Bind(&PepperExternalFileRefBackend::GetMetadataComplete,
                 weak_factory_.GetWeakPtr(),
                 reply_context));
  DCHECK(ok);
  return PP_OK_COMPLETIONPENDING;
}

int32_t PepperExternalFileRefBackend::ReadDirectoryEntries(
    ppapi::host::ReplyMessageContext context) {
  // This operation isn't supported for external filesystems.
  return PP_ERROR_NOACCESS;
}

int32_t PepperExternalFileRefBackend::GetAbsolutePath(
    ppapi::host::ReplyMessageContext reply_context) {
  host_->SendReply(reply_context,
      PpapiPluginMsg_FileRef_GetAbsolutePathReply(path_.AsUTF8Unsafe()));

  // Use PP_OK_COMPLETIONPENDING instead of PP_OK since we've already sent our
  // reply above.
  return PP_OK_COMPLETIONPENDING;
}

fileapi::FileSystemURL PepperExternalFileRefBackend::GetFileSystemURL() const {
  return fileapi::FileSystemURL();
}

base::FilePath PepperExternalFileRefBackend::GetExternalFilePath() const {
  return path_;
}

int32_t PepperExternalFileRefBackend::CanRead() const {
  if (!ChildProcessSecurityPolicyImpl::GetInstance()->
          CanReadFile(render_process_id_, path_)) {
    return PP_ERROR_NOACCESS;
  }
  return PP_OK;
}

int32_t PepperExternalFileRefBackend::CanWrite() const {
  // Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
  return CanReadWrite();
}

int32_t PepperExternalFileRefBackend::CanCreate() const {
  // Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
  return CanReadWrite();
}

int32_t PepperExternalFileRefBackend::CanReadWrite() const {
  if (!ChildProcessSecurityPolicyImpl::GetInstance()->
          CanCreateReadWriteFile(render_process_id_, path_)) {
    return PP_ERROR_NOACCESS;
  }
  return PP_OK;
}

void PepperExternalFileRefBackend::DidFinish(
    ppapi::host::ReplyMessageContext reply_context,
    const IPC::Message& msg,
    base::File::Error error) {
  reply_context.params.set_result(ppapi::FileErrorToPepperError(error));
  host_->SendReply(reply_context, msg);
}

void PepperExternalFileRefBackend::GetMetadataComplete(
    ppapi::host::ReplyMessageContext reply_context,
    const base::File::Error error,
    const base::File::Info& file_info) {
  reply_context.params.set_result(ppapi::FileErrorToPepperError(error));

  PP_FileInfo pp_file_info;
  if (error == base::File::FILE_OK) {
    ppapi::FileInfoToPepperFileInfo(file_info, PP_FILESYSTEMTYPE_EXTERNAL,
                                    &pp_file_info);
  } else {
    memset(&pp_file_info, 0, sizeof(pp_file_info));
  }

  host_->SendReply(reply_context,
                   PpapiPluginMsg_FileRef_QueryReply(pp_file_info));
}

}  // namespace content