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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_reader.h"
#include <memory>
#include <optional>
#include <utility>
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/json/json_file_value_serializer.h"
#include "base/logging.h"
#include "base/task/sequenced_task_runner.h"
#include "base/values.h"
#include "chromeos/ash/components/early_prefs/early_prefs_constants.h"
namespace ash {
namespace {
constexpr int kCurrentSchemaVersion = 1;
std::unique_ptr<base::Value> ReadFileFromDisk(const base::FilePath& data_file) {
std::unique_ptr<base::Value> result;
int error_code;
std::string error_msg;
JSONFileValueDeserializer deserializer(data_file);
result = deserializer.Deserialize(&error_code, &error_msg);
if (!result) {
if (error_code == JSONFileValueDeserializer::JSON_NO_SUCH_FILE) {
// Somewhat expected situation, do not log.
return nullptr;
}
LOG(ERROR) << "Error while loading early prefs file: " << error_msg;
}
return result;
}
} // namespace
EarlyPrefsReader::EarlyPrefsReader(
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);
}
EarlyPrefsReader::~EarlyPrefsReader() = default;
void EarlyPrefsReader::ReadFile(ResultCallback result_callback) {
CHECK(!data_);
file_task_runner_->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(&ReadFileFromDisk, data_file_),
base::BindOnce(&EarlyPrefsReader::OnFileRead, weak_factory_.GetWeakPtr(),
std::move(result_callback)));
}
void EarlyPrefsReader::OnFileRead(ResultCallback callback,
std::unique_ptr<base::Value> root) {
if (!root) {
std::move(callback).Run(false);
return;
}
if (!ValidateData(root->GetIfDict())) {
std::move(callback).Run(false);
return;
}
root_ = std::move(root);
data_ = root_->GetDict().FindDict(early_prefs::kDataKey);
CHECK(data_);
std::move(callback).Run(true);
}
bool EarlyPrefsReader::ValidateData(const base::Value::Dict* root) const {
if (!root) {
return false;
}
if (root->size() != 2) {
return false;
}
auto schema = root->FindInt(early_prefs::kSchemaKey);
if (!schema || schema.value() != kCurrentSchemaVersion) {
return false;
}
auto* data = root->FindDict(early_prefs::kDataKey);
if (!data) {
return false;
}
for (auto pref : *data) {
if (!ValidatePref(pref.second)) {
return false;
}
}
return true;
}
bool EarlyPrefsReader::ValidatePref(const base::Value& pref) const {
if (!pref.is_dict()) {
return false;
}
const auto& dict = pref.GetDict();
auto is_managed = dict.FindBool(early_prefs::kPrefIsManagedKey);
if (!is_managed) {
return false;
}
if (is_managed.value()) {
auto is_recommended = dict.FindBool(early_prefs::kPrefIsRecommendedKey);
if (!is_recommended) {
return false;
}
}
if (!dict.Find(early_prefs::kPrefValueKey)) {
return false;
}
return true;
}
bool EarlyPrefsReader::HasPref(const std::string& key) const {
if (!data_) {
return false;
}
return data_->Find(key) != nullptr;
}
bool EarlyPrefsReader::IsManaged(const std::string& key) const {
CHECK(HasPref(key));
return data_->FindDict(key)->FindBool(early_prefs::kPrefIsManagedKey).value();
}
bool EarlyPrefsReader::IsRecommended(const std::string& key) const {
CHECK(IsManaged(key));
return data_->FindDict(key)
->FindBool(early_prefs::kPrefIsRecommendedKey)
.value();
}
const base::Value* EarlyPrefsReader::GetValue(const std::string& key) const {
CHECK(HasPref(key));
return data_->FindDict(key)->Find(early_prefs::kPrefValueKey);
}
} // namespace ash
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