Experimentally isolate GetOpenFileName in a utility process.

chrome/browser/chrome_select_file_dialog_factory_win.cc

+// Copyright (c) 2014 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 "chrome/browser/chrome_select_file_dialog_factory_win.h"
+
+#include <Windows.h>
+#include <commdlg.h>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/metrics/field_trial.h"
+#include "base/strings/string16.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/win/metro.h"
+#include "chrome/common/chrome_utility_messages.h"
+#include "content/public/browser/utility_process_host.h"
+#include "content/public/browser/utility_process_host_client.h"
+#include "ipc/ipc_message_macros.h"
+#include "ui/base/win/open_file_name_win.h"
+#include "ui/shell_dialogs/select_file_dialog_win.h"
+
+namespace {
+
+// Receives the GetOpenFileName result from the utility process.
+class GetOpenFileNameClient : public content::UtilityProcessHostClient {
+ public:
+  GetOpenFileNameClient();
+
+  // Blocks until the GetOpenFileName result is received (including failure to
+  // launch or a crash of the utility process).
+  void WaitForCompletion();
+
+  // Returns the selected directory.
+  const base::FilePath& directory() { return directory_; }

[sky, 2014/07/31 20:47:46]

make const.

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+
+  // Returns the list of selected filenames. Each should be interpreted as a
+  // child of directory().
+  const std::vector<base::FilePath>& filenames() { return filenames_; }

[sky, 2014/07/31 20:47:46]

make const

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+
+  // UtilityProcessHostClient implementation
+  virtual void OnProcessCrashed(int exit_code) OVERRIDE;
+  virtual void OnProcessLaunchFailed() OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ protected:
+  virtual ~GetOpenFileNameClient();
+
+ private:
+  void OnResult(const base::FilePath& directory,
+                const std::vector<base::FilePath>& filenames);
+  void OnFailure();
+
+  base::FilePath directory_;
+  std::vector<base::FilePath> filenames_;
+  base::WaitableEvent event_;
+
+  DISALLOW_COPY_AND_ASSIGN(GetOpenFileNameClient);
+};
+
+GetOpenFileNameClient::GetOpenFileNameClient() : event_(true, false) {
+}
+
+GetOpenFileNameClient::~GetOpenFileNameClient() {}

[sky, 2014/07/31 20:47:46]

declaration/definition order should match.

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+
+void GetOpenFileNameClient::WaitForCompletion() {
+  event_.Wait();
+}
+
+void GetOpenFileNameClient::OnProcessCrashed(int exit_code) {
+  event_.Signal();
+}
+
+void GetOpenFileNameClient::OnProcessLaunchFailed() {
+  event_.Signal();
+}
+
+bool GetOpenFileNameClient::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GetOpenFileNameClient, message)
+    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_GetOpenFileName_Failed,
+                        OnFailure)
+    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_GetOpenFileName_Result,
+                        OnResult)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void GetOpenFileNameClient::OnResult(const base::FilePath& directory,
+                                     const std::vector<base::FilePath> &

[sky, 2014/07/31 20:47:46]

wrapping here is weird. & should be next to >

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+                                         filenames) {
+  directory_ = directory;
+  filenames_ = filenames;
+  event_.Signal();
+}
+
+void GetOpenFileNameClient::OnFailure() {
+  event_.Signal();
+}
+
+// Initiates IPC with a new utility process using |client|. Instructs the
+// utility process to call GetOpenFileName with |ofn|. |current_task_runner|
+// must be the currently executing task runner.
+void DoInvokeGetOpenFileName(
+    OPENFILENAME* ofn,
+    scoped_refptr<GetOpenFileNameClient> client,
+    const scoped_refptr<base::SequencedTaskRunner>& current_task_runner) {
+  DCHECK(current_task_runner->RunsTasksOnCurrentThread());
+
+  base::WeakPtr<content::UtilityProcessHost> utility_process_host(
+      content::UtilityProcessHost::Create(client, current_task_runner)
+      ->AsWeakPtr());
+  utility_process_host->DisableSandbox();
+  utility_process_host->Send(new ChromeUtilityMsg_GetOpenFileName(
+      ofn->hwndOwner,
+      ofn->Flags,
+      ui::win::OpenFileName::GetFilters(ofn),
+      base::FilePath(ofn->lpstrInitialDir ? ofn->lpstrInitialDir : L""),

[sky, 2014/07/31 20:47:46]

""->std::wstring or string16.

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+      base::FilePath(ofn->lpstrFile)));
+}
+
+// Invokes GetOpenFileName in a utility process. Blocks until the result is
+// received. Uses |blocking_task_runner| for IPC.
+bool GetOpenFileNameInUtilityProcess(
+    const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
+    OPENFILENAME* ofn) {
+  scoped_refptr<GetOpenFileNameClient> client(new GetOpenFileNameClient);
+  blocking_task_runner->PostTask(
+      FROM_HERE,
+      base::Bind(&DoInvokeGetOpenFileName,
+                 base::Unretained(ofn), client, blocking_task_runner));
+  client->WaitForCompletion();
+
+  if (!client->filenames().size())
+    return false;
+
+  ui::win::OpenFileName::SetResult(
+      client->directory(), client->filenames(), ofn);
+  return true;
+}
+
+// Implements GetOpenFileName for CreateWinSelectFileDialog by delegating either
+// to Metro or a utility process.
+bool GetOpenFileNameImpl(
+    const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
+    OPENFILENAME* ofn) {
+  HMODULE metro_module = base::win::GetMetroModule();
+  if (metro_module != NULL) {
+    typedef BOOL (*MetroGetOpenFileName)(OPENFILENAME*);
+    MetroGetOpenFileName metro_get_open_file_name =
+        reinterpret_cast<MetroGetOpenFileName>(
+            ::GetProcAddress(metro_module, "MetroGetOpenFileName"));
+    if (metro_get_open_file_name == NULL) {
+      NOTREACHED();
+      return false;
+    }
+
+    return metro_get_open_file_name(ofn) == TRUE;
+  } else if (base::FieldTrialList::FindFullName("IsolateShellOperations") ==

[sky, 2014/07/31 20:47:46]

nit: no else after return here and 166.

[erikwright (departed), 2014/08/01 13:53:15]

Done.

+             "Enabled") {
+    return GetOpenFileNameInUtilityProcess(blocking_task_runner, ofn);
+  } else {
+    return ::GetOpenFileName(ofn) == TRUE;
+  }
+}
+
+}  // namespace
+
+ChromeSelectFileDialogFactory::ChromeSelectFileDialogFactory(
+    const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner)
+    : blocking_task_runner_(blocking_task_runner) {
+}
+
+ChromeSelectFileDialogFactory::~ChromeSelectFileDialogFactory() {}
+
+ui::SelectFileDialog* ChromeSelectFileDialogFactory::Create(
+    ui::SelectFileDialog::Listener* listener,
+    ui::SelectFilePolicy* policy) {
+  return ui::CreateWinSelectFileDialog(
+      listener,
+      policy,
+      base::Bind(GetOpenFileNameImpl, blocking_task_runner_));
+}