chromecast/browser/pref_service_helper.cc

// Copyright 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 "chromecast/browser/pref_service_helper.h"

#include <string>

#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "build/build_config.h"
#include "chromecast/base/cast_paths.h"
#include "chromecast/base/pref_names.h"
#include "chromecast/chromecast_buildflags.h"
#include "components/cdm/browser/media_drm_storage_impl.h"
#include "components/prefs/json_pref_store.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service_factory.h"
#include "components/prefs/pref_store.h"
#include "components/prefs/segregated_pref_store.h"

namespace chromecast {
namespace shell {

namespace {

void UserPrefsLoadError(PersistentPrefStore::PrefReadError* error_val,
                        PersistentPrefStore::PrefReadError error) {
  DCHECK(error_val);
  *error_val = error;
}

base::FilePath GetConfigPath() {
  base::FilePath config_path;
  CHECK(base::PathService::Get(FILE_CAST_CONFIG, &config_path));
  return config_path;
}

base::FilePath GetLargeConfigPath() {
  return GetConfigPath().AddExtension(".large");
}

scoped_refptr<PersistentPrefStore> MakePrefStore() {
  auto default_pref_store =
      base::MakeRefCounted<JsonPrefStore>(GetConfigPath());

  std::set<std::string> selected_pref_names;
  if (PrefServiceHelper::LargePrefNames) {
    selected_pref_names = PrefServiceHelper::LargePrefNames();
  }
  if (selected_pref_names.empty()) {
    return default_pref_store;
  }

  auto large_pref_store =
      base::MakeRefCounted<JsonPrefStore>(GetLargeConfigPath());
  // Move large prefs out of the default pref store, if necessary.
  if (default_pref_store->ReadPrefs() ==
      PersistentPrefStore::PREF_READ_ERROR_NONE) {
    large_pref_store->ReadPrefs();
    for (const std::string& pref_name : selected_pref_names) {
      const base::Value* pref_value = nullptr;
      if (!large_pref_store->GetValue(pref_name, &pref_value)) {
        // Copy from default prefs, if possible.
        if (default_pref_store->GetValue(pref_name, &pref_value)) {
          large_pref_store->SetValue(
              pref_name, std::make_unique<base::Value>(pref_value->Clone()), 0);
        }
      }
      default_pref_store->RemoveValue(pref_name, 0);
    }
  }

  return base::MakeRefCounted<SegregatedPrefStore>(
      std::move(default_pref_store), std::move(large_pref_store),
      selected_pref_names);
}

}  // namespace

// static
std::unique_ptr<PrefService> PrefServiceHelper::CreatePrefService(
    PrefRegistrySimple* registry) {
  const base::FilePath config_path(GetConfigPath());
  DVLOG(1) << "Loading config from " << config_path.value();

  registry->RegisterBooleanPref(prefs::kMetricsIsNewClientID, false);
  // Opt-in stats default to true to handle two different cases:
  //  1) Any crashes or UMA logs are recorded prior to setup completing
  //     successfully (even though we can't send them yet).  Unless the user
  //     ends up actually opting out, we don't want to lose this data once
  //     we get network connectivity and are able to send it.  If the user
  //     opts out, nothing further will be sent (honoring the user's setting).
  //  2) Dogfood users (see dogfood agreement).
  registry->RegisterBooleanPref(prefs::kOptInStats, true);
  registry->RegisterListPref(prefs::kActiveDCSExperiments);
  registry->RegisterDictionaryPref(prefs::kLatestDCSFeatures);
  registry->RegisterIntegerPref(prefs::kWebColorScheme, 0);

  cdm::MediaDrmStorageImpl::RegisterProfilePrefs(registry);

  RegisterPlatformPrefs(registry);

  PrefServiceFactory pref_service_factory;
  pref_service_factory.set_user_prefs(MakePrefStore());
  pref_service_factory.set_async(false);

  PersistentPrefStore::PrefReadError prefs_read_error =
      PersistentPrefStore::PREF_READ_ERROR_NONE;
  pref_service_factory.set_read_error_callback(
      base::BindRepeating(&UserPrefsLoadError, &prefs_read_error));

  std::unique_ptr<PrefService> pref_service(
      pref_service_factory.Create(registry));
  if (prefs_read_error != PersistentPrefStore::PREF_READ_ERROR_NONE) {
    LOG(ERROR) << "Cannot initialize chromecast config: "
               << config_path.value()
               << ", pref_error=" << prefs_read_error;
  }

  OnPrefsLoaded(pref_service.get());
  return pref_service;
}

}  // namespace shell
}  // namespace chromecast