1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "json_node.h"
17
18 #include "log/log.h"
19 #include "utils.h"
20
21 namespace Updater {
22 namespace {
GetJsonTypeMap()23 inline const std::unordered_map<uint16_t, NodeType> &GetJsonTypeMap()
24 {
25 static const std::unordered_map<uint16_t, NodeType> jsonTypeMap {
26 { cJSON_Object, NodeType::OBJECT }, { cJSON_Array, NodeType::ARRAY }, { cJSON_Number, NodeType::INT },
27 { cJSON_String, NodeType::STRING }, { cJSON_False, NodeType::BOOL }, { cJSON_True, NodeType::BOOL },
28 { cJSON_NULL, NodeType::NUL },
29 };
30 return jsonTypeMap;
31 }
32 } // namespace
33
JsonNode()34 JsonNode::JsonNode() : type_ {NodeType::UNKNOWN}
35 {
36 }
37
JsonNode(const std::string & str,bool needDelete)38 JsonNode::JsonNode(const std::string &str, bool needDelete) : JsonNode(cJSON_Parse(str.c_str()), needDelete)
39 {
40 }
41
JsonNode(const Fs::path & path)42 JsonNode::JsonNode(const Fs::path &path)
43 {
44 std::string realPath {};
45 if (!Utils::PathToRealPath(path, realPath)) {
46 return;
47 }
48
49 std::ifstream ifs(realPath);
50 if (!ifs.is_open()) {
51 LOG(ERROR) << realPath << " not exist";
52 return;
53 }
54
55 // get root node
56 std::string content {std::istreambuf_iterator<char> {ifs}, {}};
57 cJSON *root = cJSON_Parse(content.c_str());
58 if (root == nullptr || cJSON_IsInvalid(root)) {
59 cJSON_Delete(root);
60 LOG(ERROR) << path << " contained json invalid";
61 return;
62 }
63
64 Init(root, true);
65 }
66
JsonNode(const cJSON * root,bool needDelete)67 JsonNode::JsonNode(const cJSON *root, bool needDelete)
68 {
69 if (root != nullptr && !cJSON_IsInvalid(root)) {
70 Init(root, needDelete);
71 return;
72 }
73 LOG(ERROR) << "root is not valid";
74 type_ = NodeType::UNKNOWN;
75 }
76
77
Init(const cJSON * root,bool needDelete)78 void JsonNode::Init(const cJSON *root, bool needDelete)
79 {
80 if (auto it = GetJsonTypeMap().find(root->type); it != GetJsonTypeMap().end()) {
81 type_ = it->second;
82 }
83 Parse(root);
84 if (needDelete) {
85 cJSON_Delete(const_cast<cJSON *>(root));
86 }
87 }
88
Parse(const cJSON * root)89 void JsonNode::Parse(const cJSON *root)
90 {
91 cJSON *element {};
92 size_ = 1;
93 switch (type_) {
94 case NodeType::OBJECT: {
95 innerObj_ = std::make_optional<NodeMap>();
96 auto &optNodeMap = std::get<std::optional<NodeMap>>(innerObj_);
97 cJSON_ArrayForEach(element, root)
98 {
99 std::unique_ptr<JsonNode> uPtr = std::make_unique<JsonNode>(element, false);
100 innerNodesList_.push_back(*uPtr);
101 (*optNodeMap).emplace(element->string, std::move(uPtr));
102 }
103 size_ = static_cast<int>(innerNodesList_.size());
104 break;
105 }
106 case NodeType::ARRAY: {
107 innerObj_ = std::make_optional<NodeVec>();
108 auto &optNodeVec = std::get<std::optional<NodeVec>>(innerObj_);
109 cJSON_ArrayForEach(element, root)
110 {
111 std::unique_ptr<JsonNode> uPtr = std::make_unique<JsonNode>(element, false);
112 innerNodesList_.push_back(*uPtr);
113 (*optNodeVec).push_back(std::move(uPtr));
114 }
115 size_ = static_cast<int>(innerNodesList_.size());
116 break;
117 }
118 case NodeType::INT:
119 innerObj_ = std::make_optional<int>(root->valueint);
120 innerNodesList_.push_back(*this);
121 break;
122 case NodeType::STRING:
123 innerObj_ = std::make_optional<std::string>(root->valuestring);
124 innerNodesList_.push_back(*this);
125 break;
126 case NodeType::BOOL:
127 innerObj_ = std::make_optional<bool>(root->type == cJSON_True);
128 innerNodesList_.push_back(*this);
129 break;
130 case NodeType::NUL:
131 break;
132 default:
133 LOG(ERROR) << "unknown node type";
134 break;
135 }
136 if (root->string) {
137 key_ = root->string;
138 }
139 }
140
141 JsonNode::~JsonNode() = default;
142
operator [](int idx)143 JsonNode &JsonNode::operator[](int idx)
144 {
145 return GetNodeByIdx(innerObj_, size_, idx);
146 }
147
operator [](const std::string & key)148 JsonNode &JsonNode::operator[](const std::string &key)
149 {
150 return GetNodeByKey(innerObj_, key);
151 }
152
153 const JsonNode &JsonNode::operator[](int idx) const
__anon053b7bda0202(int idx) 154 {
155 return GetNodeByIdx(innerObj_, size_, idx);
156 }
157
158 const JsonNode &JsonNode::operator[](const std::string &key) const
__anon053b7bda0302(const std::string &key) 159 {
160 return GetNodeByKey(innerObj_, key);
161 }
162
163 std::list<std::reference_wrapper<JsonNode>>::const_iterator JsonNode::begin() const
__anon053b7bda0402(const std::string &key) 164 {
165 return innerNodesList_.cbegin();
166 }
167
168 std::list<std::reference_wrapper<JsonNode>>::const_iterator JsonNode::end() const
__anon053b7bda0502(const std::string &key) 169 {
170 return innerNodesList_.cend();
171 }
172 } // namespace Updater