chromecast/browser/pref_service_helper.cc

// Copyright 2014 The Chromium Authors
// 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/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.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_name_set.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(ProcessType process_type) {
  base::FilePath config_path;
  switch (process_type) {
    case ProcessType::kCastBrowser:
      CHECK(base::PathService::Get(FILE_CAST_BROWSER_CONFIG, &config_path));
      break;
    case ProcessType::kCastService:
      CHECK(base::PathService::Get(FILE_CAST_CONFIG, &config_path));
      // No default. All possible cases are handled above.
  }
  CHECK(!config_path.empty());
  return config_path;
}

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

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

  PrefNameSet 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(process_type));
  // 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, 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,
    ProcessType process_type) {
  const base::FilePath config_path(GetConfigPath(process_type));
  DVLOG(1) << "Loading config from " << config_path.value();

  registry->RegisterBooleanPref(prefs::kMetricsIsNewClientID, false);
  registry->RegisterBooleanPref(prefs::kTosAccepted, false);
  // Opt-in stats default to true to handle two different cases:
  //  1) Any crashes or UMA logs recorded after accepting Terms of Service.
  //     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(process_type));
  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