1/*
2 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/base/json.h"
12
13#include <errno.h>
14#include <limits.h>
15#include <stdlib.h>
16
17#include <sstream>
18
19namespace rtc {
20
21bool GetStringFromJson(const Json::Value& in, std::string* out) {
22  if (!in.isString()) {
23    std::ostringstream s;
24    if (in.isBool()) {
25      s << std::boolalpha << in.asBool();
26    } else if (in.isInt()) {
27      s << in.asInt();
28    } else if (in.isUInt()) {
29      s << in.asUInt();
30    } else if (in.isDouble()) {
31      s << in.asDouble();
32    } else {
33      return false;
34    }
35    *out = s.str();
36  } else {
37    *out = in.asString();
38  }
39  return true;
40}
41
42bool GetIntFromJson(const Json::Value& in, int* out) {
43  bool ret;
44  if (!in.isString()) {
45    ret = in.isConvertibleTo(Json::intValue);
46    if (ret) {
47      *out = in.asInt();
48    }
49  } else {
50    long val;  // NOLINT
51    const char* c_str = in.asCString();
52    char* end_ptr;
53    errno = 0;
54    val = strtol(c_str, &end_ptr, 10);  // NOLINT
55    ret = (end_ptr != c_str && *end_ptr == '\0' && !errno &&
56           val >= INT_MIN && val <= INT_MAX);
57    *out = val;
58  }
59  return ret;
60}
61
62bool GetUIntFromJson(const Json::Value& in, unsigned int* out) {
63  bool ret;
64  if (!in.isString()) {
65    ret = in.isConvertibleTo(Json::uintValue);
66    if (ret) {
67      *out = in.asUInt();
68    }
69  } else {
70    unsigned long val;  // NOLINT
71    const char* c_str = in.asCString();
72    char* end_ptr;
73    errno = 0;
74    val = strtoul(c_str, &end_ptr, 10);  // NOLINT
75    ret = (end_ptr != c_str && *end_ptr == '\0' && !errno &&
76           val <= UINT_MAX);
77    *out = val;
78  }
79  return ret;
80}
81
82bool GetBoolFromJson(const Json::Value& in, bool* out) {
83  bool ret;
84  if (!in.isString()) {
85    ret = in.isConvertibleTo(Json::booleanValue);
86    if (ret) {
87      *out = in.asBool();
88    }
89  } else {
90    if (in.asString() == "true") {
91      *out = true;
92      ret = true;
93    } else if (in.asString() == "false") {
94      *out = false;
95      ret = true;
96    } else {
97      ret = false;
98    }
99  }
100  return ret;
101}
102
103bool GetDoubleFromJson(const Json::Value& in, double* out) {
104  bool ret;
105  if (!in.isString()) {
106    ret = in.isConvertibleTo(Json::realValue);
107    if (ret) {
108      *out = in.asDouble();
109    }
110  } else {
111    double val;
112    const char* c_str = in.asCString();
113    char* end_ptr;
114    errno = 0;
115    val = strtod(c_str, &end_ptr);
116    ret = (end_ptr != c_str && *end_ptr == '\0' && !errno);
117    *out = val;
118  }
119  return ret;
120}
121
122namespace {
123template<typename T>
124bool JsonArrayToVector(const Json::Value& value,
125                       bool (*getter)(const Json::Value& in, T* out),
126                       std::vector<T> *vec) {
127  vec->clear();
128  if (!value.isArray()) {
129    return false;
130  }
131
132  for (Json::Value::ArrayIndex i = 0; i < value.size(); ++i) {
133    T val;
134    if (!getter(value[i], &val)) {
135      return false;
136    }
137    vec->push_back(val);
138  }
139
140  return true;
141}
142// Trivial getter helper
143bool GetValueFromJson(const Json::Value& in, Json::Value* out) {
144  *out = in;
145  return true;
146}
147}  // unnamed namespace
148
149bool JsonArrayToValueVector(const Json::Value& in,
150                            std::vector<Json::Value>* out) {
151  return JsonArrayToVector(in, GetValueFromJson, out);
152}
153
154bool JsonArrayToIntVector(const Json::Value& in,
155                          std::vector<int>* out) {
156  return JsonArrayToVector(in, GetIntFromJson, out);
157}
158
159bool JsonArrayToUIntVector(const Json::Value& in,
160                           std::vector<unsigned int>* out) {
161  return JsonArrayToVector(in, GetUIntFromJson, out);
162}
163
164bool JsonArrayToStringVector(const Json::Value& in,
165                             std::vector<std::string>* out) {
166  return JsonArrayToVector(in, GetStringFromJson, out);
167}
168
169bool JsonArrayToBoolVector(const Json::Value& in,
170                           std::vector<bool>* out) {
171  return JsonArrayToVector(in, GetBoolFromJson, out);
172}
173
174bool JsonArrayToDoubleVector(const Json::Value& in,
175                             std::vector<double>* out) {
176  return JsonArrayToVector(in, GetDoubleFromJson, out);
177}
178
179namespace {
180template<typename T>
181Json::Value VectorToJsonArray(const std::vector<T>& vec) {
182  Json::Value result(Json::arrayValue);
183  for (size_t i = 0; i < vec.size(); ++i) {
184    result.append(Json::Value(vec[i]));
185  }
186  return result;
187}
188}  // unnamed namespace
189
190Json::Value ValueVectorToJsonArray(const std::vector<Json::Value>& in) {
191  return VectorToJsonArray(in);
192}
193
194Json::Value IntVectorToJsonArray(const std::vector<int>& in) {
195  return VectorToJsonArray(in);
196}
197
198Json::Value UIntVectorToJsonArray(const std::vector<unsigned int>& in) {
199  return VectorToJsonArray(in);
200}
201
202Json::Value StringVectorToJsonArray(const std::vector<std::string>& in) {
203  return VectorToJsonArray(in);
204}
205
206Json::Value BoolVectorToJsonArray(const std::vector<bool>& in) {
207  return VectorToJsonArray(in);
208}
209
210Json::Value DoubleVectorToJsonArray(const std::vector<double>& in) {
211  return VectorToJsonArray(in);
212}
213
214bool GetValueFromJsonArray(const Json::Value& in, size_t n,
215                           Json::Value* out) {
216  if (!in.isArray() || !in.isValidIndex(static_cast<int>(n))) {
217    return false;
218  }
219
220  *out = in[static_cast<Json::Value::ArrayIndex>(n)];
221  return true;
222}
223
224bool GetIntFromJsonArray(const Json::Value& in, size_t n,
225                         int* out) {
226  Json::Value x;
227  return GetValueFromJsonArray(in, n, &x) && GetIntFromJson(x, out);
228}
229
230bool GetUIntFromJsonArray(const Json::Value& in, size_t n,
231                          unsigned int* out)  {
232  Json::Value x;
233  return GetValueFromJsonArray(in, n, &x) && GetUIntFromJson(x, out);
234}
235
236bool GetStringFromJsonArray(const Json::Value& in, size_t n,
237                            std::string* out) {
238  Json::Value x;
239  return GetValueFromJsonArray(in, n, &x) && GetStringFromJson(x, out);
240}
241
242bool GetBoolFromJsonArray(const Json::Value& in, size_t n,
243                          bool* out) {
244  Json::Value x;
245  return GetValueFromJsonArray(in, n, &x) && GetBoolFromJson(x, out);
246}
247
248bool GetDoubleFromJsonArray(const Json::Value& in, size_t n,
249                            double* out) {
250  Json::Value x;
251  return GetValueFromJsonArray(in, n, &x) && GetDoubleFromJson(x, out);
252}
253
254bool GetValueFromJsonObject(const Json::Value& in, const std::string& k,
255                            Json::Value* out) {
256  if (!in.isObject() || !in.isMember(k)) {
257    return false;
258  }
259
260  *out = in[k];
261  return true;
262}
263
264bool GetIntFromJsonObject(const Json::Value& in, const std::string& k,
265                          int* out) {
266  Json::Value x;
267  return GetValueFromJsonObject(in, k, &x) && GetIntFromJson(x, out);
268}
269
270bool GetUIntFromJsonObject(const Json::Value& in, const std::string& k,
271                           unsigned int* out)  {
272  Json::Value x;
273  return GetValueFromJsonObject(in, k, &x) && GetUIntFromJson(x, out);
274}
275
276bool GetStringFromJsonObject(const Json::Value& in, const std::string& k,
277                             std::string* out)  {
278  Json::Value x;
279  return GetValueFromJsonObject(in, k, &x) && GetStringFromJson(x, out);
280}
281
282bool GetBoolFromJsonObject(const Json::Value& in, const std::string& k,
283                           bool* out) {
284  Json::Value x;
285  return GetValueFromJsonObject(in, k, &x) && GetBoolFromJson(x, out);
286}
287
288bool GetDoubleFromJsonObject(const Json::Value& in, const std::string& k,
289                             double* out) {
290  Json::Value x;
291  return GetValueFromJsonObject(in, k, &x) && GetDoubleFromJson(x, out);
292}
293
294std::string JsonValueToString(const Json::Value& json) {
295  Json::FastWriter w;
296  std::string value = w.write(json);
297  return value.substr(0, value.size() - 1);  // trim trailing newline
298}
299
300}  // namespace rtc
301