1 // Copyright 2020 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "fuchsia/base/config_reader.h"
6 
7 #include "base/files/file_util.h"
8 #include "base/json/json_reader.h"
9 #include "base/logging.h"
10 #include "base/no_destructor.h"
11 
12 namespace cr_fuchsia {
13 
14 namespace {
15 
ReadPackageConfig()16 base::Optional<base::Value> ReadPackageConfig() {
17   constexpr char kConfigPath[] = "/config/data/config.json";
18 
19   base::FilePath path(kConfigPath);
20   if (!base::PathExists(path)) {
21     LOG(WARNING) << "Config file doesn't exist: " << path.value();
22     return base::nullopt;
23   }
24 
25   std::string file_content;
26   bool loaded = base::ReadFileToString(path, &file_content);
27   if (!loaded) {
28     LOG(WARNING) << "Couldn't read config file: " << path.value();
29     return base::nullopt;
30   }
31 
32   base::JSONReader::ValueWithError parsed =
33       base::JSONReader::ReadAndReturnValueWithError(file_content);
34   CHECK(parsed.value) << "Failed to parse " << path.value() << ": "
35                       << parsed.error_message;
36   CHECK(parsed.value->is_dict())
37       << "Config is not a JSON dictionary: " << path.value();
38 
39   return std::move(parsed.value);
40 }
41 
42 }  // namespace
43 
LoadPackageConfig()44 const base::Optional<base::Value>& LoadPackageConfig() {
45   // Package configurations do not change at run-time, so read the configuration
46   // on the first call and cache the result.
47   static base::NoDestructor<base::Optional<base::Value>> config(
48       ReadPackageConfig());
49   return *config;
50 }
51 
52 }  // namespace cr_fuchsia
53