1 /*
2 * Copyright 2020 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 "storage/legacy_config_file.h"
18
19 #include <bluetooth/log.h>
20
21 #include <cerrno>
22 #include <fstream>
23 #include <sstream>
24
25 #include "common/strings.h"
26 #include "os/files.h"
27 #include "storage/device.h"
28
29 namespace bluetooth {
30 namespace storage {
31
LegacyConfigFile(std::string path)32 LegacyConfigFile::LegacyConfigFile(std::string path) : path_(std::move(path)) {
33 log::assert_that(!path_.empty(), "assert failed: !path_.empty()");
34 }
35
Read(size_t temp_devices_capacity)36 std::optional<ConfigCache> LegacyConfigFile::Read(size_t temp_devices_capacity) {
37 log::assert_that(!path_.empty(), "assert failed: !path_.empty()");
38 std::ifstream config_file(path_);
39 if (!config_file || !config_file.is_open()) {
40 log::error("unable to open file '{}', error: {}", path_, strerror(errno));
41 return std::nullopt;
42 }
43 [[maybe_unused]] int line_num = 0;
44 ConfigCache cache(temp_devices_capacity, Device::kLinkKeyProperties);
45 std::string line;
46 std::string section(ConfigCache::kDefaultSectionName);
47 while (std::getline(config_file, line)) {
48 ++line_num;
49 line = common::StringTrim(std::move(line));
50 if (line.empty()) {
51 continue;
52 }
53
54 if (line.front() == '\0' || line.front() == '#') {
55 continue;
56 }
57 if (line.front() == '[') {
58 if (line.back() != ']') {
59 log::warn("unterminated section name on line {}", line_num);
60 return std::nullopt;
61 }
62 // Read 'test' from '[text]', hence -2
63 section = line.substr(1, line.size() - 2);
64 } else {
65 auto tokens = common::StringSplit(line, "=", 2);
66 if (tokens.size() != 2) {
67 log::warn("no key/value separator found on line {}", line_num);
68 return std::nullopt;
69 }
70 tokens[0] = common::StringTrim(std::move(tokens[0]));
71 tokens[1] = common::StringTrim(std::move(tokens[1]));
72 cache.SetProperty(section, tokens[0], std::move(tokens[1]));
73 }
74 }
75 return cache;
76 }
77
Write(const ConfigCache & cache)78 bool LegacyConfigFile::Write(const ConfigCache& cache) {
79 return os::WriteToFile(path_, cache.SerializeToLegacyFormat());
80 }
81
Delete()82 bool LegacyConfigFile::Delete() {
83 if (!os::FileExists(path_)) {
84 log::warn("Config file at \"{}\" does not exist", path_);
85 return false;
86 }
87 return os::RemoveFile(path_);
88 }
89
90 } // namespace storage
91 } // namespace bluetooth
92