1 /*
2 * Copyright (C) 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 "host/frontend/webrtc/lib/utils.h"
18
19 #include <map>
20
21 #include <json/json.h>
22
23 namespace cuttlefish {
24 namespace webrtc_streaming {
25
26 namespace {
27
ValidateField(const Json::Value & obj,const std::string & type,const std::string & field_name,const Json::ValueType & field_type,bool required)28 std::string ValidateField(const Json::Value &obj, const std::string &type,
29 const std::string &field_name,
30 const Json::ValueType &field_type, bool required) {
31 if (!obj.isObject()) {
32 return "Expected object with name-value pairs";
33 }
34 if (!obj.isMember(field_name) && !required) {
35 return "";
36 }
37 if (!(obj.isMember(field_name) &&
38 obj[field_name].isConvertibleTo(field_type))) {
39 std::string error_msg = "Expected a field named '";
40 error_msg += field_name + "' of type '";
41 error_msg += std::to_string(field_type);
42 error_msg += "'";
43 if (!type.empty()) {
44 error_msg += " in message of type '" + type + "'";
45 }
46 error_msg += ".";
47 return error_msg;
48 }
49 return "";
50 }
51
52 } // namespace
53
ValidateJsonObject(const Json::Value & obj,const std::string & type,const std::map<std::string,Json::ValueType> & required_fields,const std::map<std::string,Json::ValueType> & optional_fields)54 ValidationResult ValidationResult::ValidateJsonObject(
55 const Json::Value &obj, const std::string &type,
56 const std::map<std::string, Json::ValueType> &required_fields,
57 const std::map<std::string, Json::ValueType> &optional_fields) {
58 for (const auto &field_spec : required_fields) {
59 auto result =
60 ValidateField(obj, type, field_spec.first, field_spec.second, true);
61 if (!result.empty()) {
62 return {result};
63 }
64 }
65 for (const auto &field_spec : optional_fields) {
66 auto result =
67 ValidateField(obj, type, field_spec.first, field_spec.second, false);
68 if (!result.empty()) {
69 return {result};
70 }
71 }
72 return {};
73 }
74
75 } // namespace webrtc_streaming
76 } // namespace cuttlefish
77