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- // Copyright 2018 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 "ash/components/arc/arc_features_parser.h"
- #include <memory>
- #include "ash/components/arc/arc_util.h"
- #include "base/bind.h"
- #include "base/files/file_util.h"
- #include "base/json/json_reader.h"
- #include "base/logging.h"
- #include "base/strings/string_util.h"
- #include "base/task/thread_pool.h"
- #include "base/threading/scoped_blocking_call.h"
- #include "base/values.h"
- namespace arc {
- namespace {
- constexpr const base::FilePath::CharType kArcVmFeaturesJsonFile[] =
- FILE_PATH_LITERAL("/etc/arcvm/features.json");
- constexpr const base::FilePath::CharType kArcFeaturesJsonFile[] =
- FILE_PATH_LITERAL("/etc/arc/features.json");
- base::RepeatingCallback<absl::optional<ArcFeatures>()>*
- g_arc_features_getter_for_testing = nullptr;
- absl::optional<ArcFeatures> ParseFeaturesJson(base::StringPiece input_json) {
- ArcFeatures arc_features;
- auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(input_json);
- if (!parsed_json.has_value()) {
- LOG(ERROR) << "Error parsing feature JSON: " << parsed_json.error().message;
- return absl::nullopt;
- } else if (!parsed_json->is_dict()) {
- LOG(ERROR) << "Error parsing feature JSON: Expected a dictionary.";
- return absl::nullopt;
- }
- const base::Value::Dict& dict = parsed_json->GetDict();
- // Parse each item under features.
- const base::Value::List* feature_list = dict.FindList("features");
- if (!feature_list) {
- LOG(ERROR) << "No feature list in JSON.";
- return absl::nullopt;
- }
- for (auto& feature_item : *feature_list) {
- const std::string* feature_name = feature_item.GetDict().FindString("name");
- const absl::optional<int> feature_version =
- feature_item.GetDict().FindInt("version");
- if (!feature_name || feature_name->empty()) {
- LOG(ERROR) << "Missing name in the feature.";
- return absl::nullopt;
- }
- if (!feature_version.has_value()) {
- LOG(ERROR) << "Missing version in the feature.";
- return absl::nullopt;
- }
- arc_features.feature_map.emplace(*feature_name, *feature_version);
- }
- // Parse each item under unavailable_features.
- const base::Value::List* unavailable_feature_list =
- dict.FindList("unavailable_features");
- if (!unavailable_feature_list) {
- LOG(ERROR) << "No unavailable feature list in JSON.";
- return absl::nullopt;
- }
- for (auto& feature_item : *unavailable_feature_list) {
- if (!feature_item.is_string()) {
- LOG(ERROR) << "Item in the unavailable feature list is not a string.";
- return absl::nullopt;
- }
- if (feature_item.GetString().empty()) {
- LOG(ERROR) << "Missing name in the feature.";
- return absl::nullopt;
- }
- arc_features.unavailable_features.emplace_back(feature_item.GetString());
- }
- // Parse each item under properties.
- const base::Value::Dict* properties = dict.FindDict("properties");
- if (!properties) {
- LOG(ERROR) << "No properties in JSON.";
- return absl::nullopt;
- }
- for (const auto item : *properties) {
- if (!item.second.is_string()) {
- LOG(ERROR) << "Item in the properties mapping is not a string.";
- return absl::nullopt;
- }
- arc_features.build_props.emplace(item.first, item.second.GetString());
- }
- // Parse the Play Store version
- const std::string* play_version = dict.FindString("play_store_version");
- if (!play_version) {
- LOG(ERROR) << "No Play Store version in JSON.";
- return absl::nullopt;
- }
- arc_features.play_store_version = *play_version;
- return arc_features;
- }
- absl::optional<ArcFeatures> ReadOnFileThread(const base::FilePath& file_path) {
- DCHECK(!file_path.empty());
- base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
- base::BlockingType::MAY_BLOCK);
- std::string input_json;
- {
- base::ScopedBlockingCall scoped_blocking_call(
- FROM_HERE, base::BlockingType::MAY_BLOCK);
- if (!base::ReadFileToString(file_path, &input_json)) {
- PLOG(ERROR) << "Cannot read file " << file_path.value()
- << " into string.";
- return absl::nullopt;
- }
- }
- if (input_json.empty()) {
- LOG(ERROR) << "Input JSON is empty in file " << file_path.value();
- return absl::nullopt;
- }
- return ParseFeaturesJson(input_json);
- }
- } // namespace
- ArcFeatures::ArcFeatures() = default;
- ArcFeatures::ArcFeatures(ArcFeatures&& other) = default;
- ArcFeatures::~ArcFeatures() = default;
- ArcFeatures& ArcFeatures::operator=(ArcFeatures&& other) = default;
- void ArcFeaturesParser::GetArcFeatures(
- base::OnceCallback<void(absl::optional<ArcFeatures>)> callback) {
- if (g_arc_features_getter_for_testing) {
- std::move(callback).Run(g_arc_features_getter_for_testing->Run());
- return;
- }
- const auto* json_file =
- arc::IsArcVmEnabled() ? kArcVmFeaturesJsonFile : kArcFeaturesJsonFile;
- base::ThreadPool::PostTaskAndReplyWithResult(
- FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
- base::BindOnce(&ReadOnFileThread, base::FilePath(json_file)),
- std::move(callback));
- }
- absl::optional<ArcFeatures> ArcFeaturesParser::ParseFeaturesJsonForTesting(
- base::StringPiece input_json) {
- return ParseFeaturesJson(input_json);
- }
- void ArcFeaturesParser::SetArcFeaturesGetterForTesting(
- base::RepeatingCallback<absl::optional<ArcFeatures>()>* getter) {
- g_arc_features_getter_for_testing = getter;
- }
- } // namespace arc
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