chrome/browser/android/vr/ui_module_factory.cc

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/android/vr/ui_module_factory.h"

#include <dlfcn.h>

#include <utility>

#include "base/android/bundle_utils.h"
#include "base/memory/ptr_util.h"
#include "chrome/browser/vr/audio_delegate.h"
#include "chrome/browser/vr/content_input_delegate.h"
#include "chrome/browser/vr/keyboard_delegate.h"
#include "chrome/browser/vr/text_input_delegate.h"
#include "chrome/browser/vr/ui_interface.h"

namespace vr {

std::unique_ptr<UiInterface> UiModuleFactory::Create(
    UiBrowserInterface* browser,
    PlatformInputHandler* content_input_forwarder,
    std::unique_ptr<KeyboardDelegate> keyboard_delegate,
    std::unique_ptr<TextInputDelegate> text_input_delegate,
    std::unique_ptr<AudioDelegate> audio_delegate,
    const UiInitialState& ui_initial_state) {
  // Do not dlclose() the library. Doing so causes issues with cardboard on
  // Android M. It's not clear whether there is a use-after-free in VR code, or
  // a linker or system issue. See https://crbug.com/994029.

  // TODO(https://crbug.com/1019853): When all VR native code moves into the
  // feature module, this factory will completely disappear. In the meantime,
  // make it tolerant of two different variants of the VR lib (one for Chrome,
  // one for Monochrome). chrome_64_vr_partition is omitted since it is not
  // shipped in 64-bit configuration.
  const std::vector<const std::string> library_name_possibilities = {
      "monochrome_vr_partition",
      "monochrome_64_vr_partition",
      "chrome_vr_partition",
  };

  void* ui_library_handle = nullptr;
  const std::string partition_name = "vr_partition";
  for (const auto& library_name : library_name_possibilities) {
    ui_library_handle =
        base::android::BundleUtils::DlOpenModuleLibraryPartition(
            library_name, partition_name, "vr");
    if (ui_library_handle != nullptr) {
      break;
    }
  }
  CHECK(ui_library_handle != nullptr)
      << "Could not open VR UI library:" << dlerror();

  CreateUiFunction* create_ui =
      reinterpret_cast<CreateUiFunction*>(dlsym(ui_library_handle, "CreateUi"));
  CHECK(create_ui != nullptr);

  std::unique_ptr<UiInterface> ui = base::WrapUnique(
      create_ui(browser, content_input_forwarder, std::move(keyboard_delegate),
                std::move(text_input_delegate), std::move(audio_delegate),
                ui_initial_state));
  CHECK(ui != nullptr);

  return ui;
}

std::unique_ptr<UiFactory> CreateUiFactory() {
  return std::make_unique<UiModuleFactory>();
}

}  // namespace vr