1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "chre_host/config_util.h"
18 #include "chre_host/log.h"
19
20 #include <algorithm>
21 #include <dirent.h>
22 #include <json/json.h>
23 #include <filesystem>
24 #include <fstream>
25 #include <regex>
26
27 namespace android {
28 namespace chre {
29
findAllNanoappsInFolder(const std::string & path,std::vector<std::string> & outNanoapps)30 bool findAllNanoappsInFolder(const std::string &path,
31 std::vector<std::string> &outNanoapps) {
32 DIR *dir = opendir(path.c_str());
33 if (dir == nullptr) {
34 LOGE("Failed to open nanoapp folder %s", path.c_str());
35 return false;
36 }
37 std::regex regex("(\\w+)\\.napp_header");
38 std::cmatch match;
39 for (struct dirent *entry; (entry = readdir(dir)) != nullptr;) {
40 if (!std::regex_match(entry->d_name, match, regex)) {
41 continue;
42 }
43 std::string nanoapp_name = match[1];
44 LOGD("Found nanoapp: %s", nanoapp_name.c_str());
45 outNanoapps.push_back(nanoapp_name);
46 }
47 closedir(dir);
48 std::sort(outNanoapps.begin(), outNanoapps.end());
49 return true;
50 }
51
getPreloadedNanoappsFromConfigFile(const std::string & configFilePath,std::string & outDirectory,std::vector<std::string> & outNanoapps)52 bool getPreloadedNanoappsFromConfigFile(const std::string &configFilePath,
53 std::string &outDirectory,
54 std::vector<std::string> &outNanoapps) {
55 std::ifstream configFileStream(configFilePath);
56
57 Json::CharReaderBuilder builder;
58 Json::Value config;
59 if (!configFileStream) {
60 // TODO(b/350102369) to deprecate preloaded_nanoapps.json
61 // During the transition, fall back to the old behavior if the json
62 // file exists. But if the json file does not exist, do the new behavior
63 // to load all nanoapps in /vendor/etc/chre or where ever the location.
64 LOGI("Failed to open config file '%s' load all nanoapps in folder ",
65 configFilePath.c_str());
66 std::filesystem::path path(configFilePath);
67 outDirectory = path.parent_path().string();
68 return findAllNanoappsInFolder(outDirectory, outNanoapps);
69 } else if (!Json::parseFromStream(builder, configFileStream, &config,
70 /* errs = */ nullptr)) {
71 LOGE("Failed to parse nanoapp config file");
72 return false;
73 } else if (!config.isMember("nanoapps") || !config.isMember("source_dir")) {
74 LOGE("Malformed preloaded nanoapps config");
75 return false;
76 }
77
78 outDirectory = config["source_dir"].asString();
79 for (Json::ArrayIndex i = 0; i < config["nanoapps"].size(); ++i) {
80 const std::string &nanoappName = config["nanoapps"][i].asString();
81 outNanoapps.push_back(nanoappName);
82 }
83 return true;
84 }
85
86 } // namespace chre
87 } // namespace android
88