content/renderer/pepper/pepper_file_system_host.cc

// Copyright (c) 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/renderer/pepper/pepper_file_system_host.h"

#include "base/bind.h"
#include "base/callback.h"
#include "base/optional.h"
#include "content/common/pepper_file_util.h"
#include "content/public/common/service_names.mojom.h"
#include "content/public/renderer/render_view.h"
#include "content/public/renderer/renderer_ppapi_host.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/dispatch_host_message.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/file_system_util.h"
#include "ppapi/shared_impl/file_type_conversion.h"
#include "storage/common/file_system/file_system_util.h"
#include "third_party/blink/public/mojom/filesystem/file_system.mojom.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/web/web_view.h"

namespace content {

namespace {

base::Optional<blink::mojom::FileSystemType>
PepperFileSystemTypeToMojoFileSystemType(PP_FileSystemType type) {
  switch (type) {
    case PP_FILESYSTEMTYPE_LOCALTEMPORARY:
      return blink::mojom::FileSystemType::kTemporary;
    case PP_FILESYSTEMTYPE_LOCALPERSISTENT:
      return blink::mojom::FileSystemType::kPersistent;
    case PP_FILESYSTEMTYPE_EXTERNAL:
      return blink::mojom::FileSystemType::kExternal;
    default:
      return base::nullopt;
  }
}

}  // namespace

PepperFileSystemHost::PepperFileSystemHost(RendererPpapiHost* host,
                                           PP_Instance instance,
                                           PP_Resource resource,
                                           PP_FileSystemType type)
    : ResourceHost(host->GetPpapiHost(), instance, resource),
      renderer_ppapi_host_(host),
      type_(type),
      opened_(false),
      called_open_(false) {}

PepperFileSystemHost::PepperFileSystemHost(RendererPpapiHost* host,
                                           PP_Instance instance,
                                           PP_Resource resource,
                                           const GURL& root_url,
                                           PP_FileSystemType type)
    : ResourceHost(host->GetPpapiHost(), instance, resource),
      renderer_ppapi_host_(host),
      type_(type),
      opened_(true),
      root_url_(root_url),
      called_open_(true) {}

PepperFileSystemHost::~PepperFileSystemHost() {}

int32_t PepperFileSystemHost::OnResourceMessageReceived(
    const IPC::Message& msg,
    ppapi::host::HostMessageContext* context) {
  PPAPI_BEGIN_MESSAGE_MAP(PepperFileSystemHost, msg)
    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_FileSystem_Open,
                                      OnHostMsgOpen)
    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
        PpapiHostMsg_FileSystem_InitIsolatedFileSystem,
        OnHostMsgInitIsolatedFileSystem)
  PPAPI_END_MESSAGE_MAP()
  return PP_ERROR_FAILED;
}

bool PepperFileSystemHost::IsFileSystemHost() { return true; }

void PepperFileSystemHost::DidOpenFileSystem(
    const std::string& /* name_unused */,
    const GURL& root,
    base::File::Error error) {
  if (error != base::File::FILE_OK) {
    DidFailOpenFileSystem(error);
    return;
  }
  opened_ = true;
  root_url_ = root;
  reply_context_.params.set_result(PP_OK);
  host()->SendReply(reply_context_, PpapiPluginMsg_FileSystem_OpenReply());
  reply_context_ = ppapi::host::ReplyMessageContext();
}

void PepperFileSystemHost::DidFailOpenFileSystem(base::File::Error error) {
  int32_t pp_error = ppapi::FileErrorToPepperError(error);
  opened_ = (pp_error == PP_OK);
  reply_context_.params.set_result(pp_error);
  host()->SendReply(reply_context_, PpapiPluginMsg_FileSystem_OpenReply());
  reply_context_ = ppapi::host::ReplyMessageContext();
}

int32_t PepperFileSystemHost::OnHostMsgOpen(
    ppapi::host::HostMessageContext* context,
    int64_t expected_size) {
  // Not allow multiple opens.
  if (called_open_)
    return PP_ERROR_INPROGRESS;
  called_open_ = true;

  base::Optional<blink::mojom::FileSystemType> file_system_type =
      PepperFileSystemTypeToMojoFileSystemType(type_);
  if (!file_system_type.has_value())
    return PP_ERROR_FAILED;

  GURL document_url = renderer_ppapi_host_->GetDocumentURL(pp_instance());
  if (!document_url.is_valid())
    return PP_ERROR_FAILED;

  reply_context_ = context->MakeReplyMessageContext();
  GetFileSystemManager().Open(
      url::Origin::Create(document_url), file_system_type.value(),
      base::BindOnce(&PepperFileSystemHost::DidOpenFileSystem, AsWeakPtr()));
  return PP_OK_COMPLETIONPENDING;
}

int32_t PepperFileSystemHost::OnHostMsgInitIsolatedFileSystem(
    ppapi::host::HostMessageContext* context,
    const std::string& fsid,
    PP_IsolatedFileSystemType_Private type) {
  // Do not allow multiple opens.
  if (called_open_)
    return PP_ERROR_INPROGRESS;
  called_open_ = true;

  // Do a sanity check.
  if (!storage::ValidateIsolatedFileSystemId(fsid))
    return PP_ERROR_BADARGUMENT;

  RenderView* view =
      renderer_ppapi_host_->GetRenderViewForInstance(pp_instance());
  if (!view)
    return PP_ERROR_FAILED;

  url::Origin main_frame_origin(
      view->GetWebView()->MainFrame()->GetSecurityOrigin());
  const std::string root_name = ppapi::IsolatedFileSystemTypeToRootName(type);
  if (root_name.empty())
    return PP_ERROR_BADARGUMENT;
  root_url_ = GURL(storage::GetIsolatedFileSystemRootURIString(
      main_frame_origin.GetURL(), fsid, root_name));
  opened_ = true;
  return PP_OK;
}

blink::mojom::FileSystemManager& PepperFileSystemHost::GetFileSystemManager() {
  if (!file_system_manager_) {
    ChildThreadImpl::current()->BindHostReceiver(
        file_system_manager_.BindNewPipeAndPassReceiver());
  }
  return *file_system_manager_;
}

}  // namespace content