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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/early_prefs/early_prefs_writer.h"
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include "base/files/file_path.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/values.h"
#include "chromeos/ash/components/early_prefs/early_prefs_constants.h"
namespace ash {
namespace {
constexpr int kCurrentSchemaVersion = 1;
} // namespace
EarlyPrefsWriter::EarlyPrefsWriter(
const base::FilePath& data_dir,
scoped_refptr<base::SequencedTaskRunner> file_task_runner)
: file_task_runner_(std::move(file_task_runner)) {
data_file_ = data_dir.Append(early_prefs::kEarlyPrefsFileName);
writer_ = std::make_unique<base::ImportantFileWriter>(
data_file_, file_task_runner_, early_prefs::kEarlyPrefsHistogramName);
root_.Set(early_prefs::kSchemaKey, kCurrentSchemaVersion);
data_ = root_.EnsureDict(early_prefs::kDataKey);
// Overwrite existing file, to clear previous prefs, if any.
ScheduleWrite();
}
EarlyPrefsWriter::~EarlyPrefsWriter() = default;
void EarlyPrefsWriter::StoreUserPref(const std::string& key,
const base::Value& value) {
// Check if value is the same.
auto* existing = data_->FindDict(key);
base::Value::Dict new_value;
SerializeUserPref(value, new_value);
if (existing) {
if (new_value == *existing) {
// Values are same, no need to store data
return;
}
}
data_->Set(key, std::move(new_value));
ScheduleWrite();
}
void EarlyPrefsWriter::StorePolicy(const std::string& key,
const base::Value& value,
bool is_recommended) {
// Check if value is the same.
auto* existing = data_->FindDict(key);
base::Value::Dict new_value;
SerializePolicy(value, is_recommended, new_value);
if (existing) {
if (new_value == *existing) {
// Values are same, no need to store data
return;
}
}
data_->Set(key, std::move(new_value));
ScheduleWrite();
}
void EarlyPrefsWriter::SerializeUserPref(const base::Value& value,
base::Value::Dict& result) const {
result.Set(early_prefs::kPrefIsManagedKey, false);
result.Set(early_prefs::kPrefValueKey, value.Clone());
}
void EarlyPrefsWriter::SerializePolicy(const base::Value& value,
bool is_recommended,
base::Value::Dict& result) const {
result.Set(early_prefs::kPrefIsManagedKey, true);
result.Set(early_prefs::kPrefIsRecommendedKey, is_recommended);
result.Set(early_prefs::kPrefValueKey, value.Clone());
}
void EarlyPrefsWriter::ResetPref(const std::string& key) {
bool changed = data_->Remove(key);
if (changed) {
ScheduleWrite();
}
}
void EarlyPrefsWriter::CommitPendingWrites() {
if (writer_->HasPendingWrite()) {
writer_->DoScheduledWrite();
}
}
void EarlyPrefsWriter::ScheduleWrite() {
writer_->ScheduleWrite(this);
}
std::optional<std::string> EarlyPrefsWriter::SerializeData() {
std::string output;
if (!base::JSONWriter::Write(root_, &output)) {
NOTREACHED() << "Failed to serialize early preferences : " << data_file_;
}
return output;
}
} // namespace ash
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