1// Protocol Buffers - Google's data interchange format
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30
31// Utility functions to convert between protobuf binary format and proto3 JSON
32// format.
33#ifndef GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__
34#define GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__
35
36#include <google/protobuf/message.h>
37#include <google/protobuf/util/type_resolver.h>
38#include <google/protobuf/stubs/bytestream.h>
39#include <google/protobuf/stubs/strutil.h>
40
41#include <google/protobuf/port_def.inc>
42
43namespace google {
44namespace protobuf {
45namespace io {
46class ZeroCopyInputStream;
47class ZeroCopyOutputStream;
48} // namespace io
49namespace util {
50
51struct JsonParseOptions {
52 // Whether to ignore unknown JSON fields during parsing
53 bool ignore_unknown_fields;
54
55 // If true, when a lowercase enum value fails to parse, try convert it to
56 // UPPER_CASE and see if it matches a valid enum.
57 // WARNING: This option exists only to preserve legacy behavior. Avoid using
58 // this option. If your enum needs to support different casing, consider using
59 // allow_alias instead.
60 bool case_insensitive_enum_parsing;
61
62 JsonParseOptions()
63 : ignore_unknown_fields(false),
64 case_insensitive_enum_parsing(false) {}
65};
66
67struct JsonPrintOptions {
68 // Whether to add spaces, line breaks and indentation to make the JSON output
69 // easy to read.
70 bool add_whitespace;
71 // Whether to always print primitive fields. By default proto3 primitive
72 // fields with default values will be omitted in JSON output. For example, an
73 // int32 field set to 0 will be omitted. Set this flag to true will override
74 // the default behavior and print primitive fields regardless of their values.
75 bool always_print_primitive_fields;
76 // Whether to always print enums as ints. By default they are rendered as
77 // strings.
78 bool always_print_enums_as_ints;
79 // Whether to preserve proto field names
80 bool preserve_proto_field_names;
81
82 JsonPrintOptions()
83 : add_whitespace(false),
84 always_print_primitive_fields(false),
85 always_print_enums_as_ints(false),
86 preserve_proto_field_names(false) {}
87};
88
89// DEPRECATED. Use JsonPrintOptions instead.
90typedef JsonPrintOptions JsonOptions;
91
92// Converts from protobuf message to JSON and appends it to |output|. This is a
93// simple wrapper of BinaryToJsonString(). It will use the DescriptorPool of the
94// passed-in message to resolve Any types.
95PROTOBUF_EXPORT util::Status MessageToJsonString(const Message& message,
96 std::string* output,
97 const JsonOptions& options);
98
99inline util::Status MessageToJsonString(const Message& message,
100 std::string* output) {
101 return MessageToJsonString(message, output, options: JsonOptions());
102}
103
104// Converts from JSON to protobuf message. This is a simple wrapper of
105// JsonStringToBinary(). It will use the DescriptorPool of the passed-in
106// message to resolve Any types.
107PROTOBUF_EXPORT util::Status JsonStringToMessage(
108 StringPiece input, Message* message, const JsonParseOptions& options);
109
110inline util::Status JsonStringToMessage(StringPiece input,
111 Message* message) {
112 return JsonStringToMessage(input, message, options: JsonParseOptions());
113}
114
115// Converts protobuf binary data to JSON.
116// The conversion will fail if:
117// 1. TypeResolver fails to resolve a type.
118// 2. input is not valid protobuf wire format, or conflicts with the type
119// information returned by TypeResolver.
120// Note that unknown fields will be discarded silently.
121PROTOBUF_EXPORT util::Status BinaryToJsonStream(
122 TypeResolver* resolver, const std::string& type_url,
123 io::ZeroCopyInputStream* binary_input,
124 io::ZeroCopyOutputStream* json_output, const JsonPrintOptions& options);
125
126inline util::Status BinaryToJsonStream(
127 TypeResolver* resolver, const std::string& type_url,
128 io::ZeroCopyInputStream* binary_input,
129 io::ZeroCopyOutputStream* json_output) {
130 return BinaryToJsonStream(resolver, type_url, binary_input, json_output,
131 options: JsonPrintOptions());
132}
133
134PROTOBUF_EXPORT util::Status BinaryToJsonString(
135 TypeResolver* resolver, const std::string& type_url,
136 const std::string& binary_input, std::string* json_output,
137 const JsonPrintOptions& options);
138
139inline util::Status BinaryToJsonString(TypeResolver* resolver,
140 const std::string& type_url,
141 const std::string& binary_input,
142 std::string* json_output) {
143 return BinaryToJsonString(resolver, type_url, binary_input, json_output,
144 options: JsonPrintOptions());
145}
146
147// Converts JSON data to protobuf binary format.
148// The conversion will fail if:
149// 1. TypeResolver fails to resolve a type.
150// 2. input is not valid JSON format, or conflicts with the type
151// information returned by TypeResolver.
152PROTOBUF_EXPORT util::Status JsonToBinaryStream(
153 TypeResolver* resolver, const std::string& type_url,
154 io::ZeroCopyInputStream* json_input,
155 io::ZeroCopyOutputStream* binary_output, const JsonParseOptions& options);
156
157inline util::Status JsonToBinaryStream(
158 TypeResolver* resolver, const std::string& type_url,
159 io::ZeroCopyInputStream* json_input,
160 io::ZeroCopyOutputStream* binary_output) {
161 return JsonToBinaryStream(resolver, type_url, json_input, binary_output,
162 options: JsonParseOptions());
163}
164
165PROTOBUF_EXPORT util::Status JsonToBinaryString(
166 TypeResolver* resolver, const std::string& type_url,
167 StringPiece json_input, std::string* binary_output,
168 const JsonParseOptions& options);
169
170inline util::Status JsonToBinaryString(TypeResolver* resolver,
171 const std::string& type_url,
172 StringPiece json_input,
173 std::string* binary_output) {
174 return JsonToBinaryString(resolver, type_url, json_input, binary_output,
175 options: JsonParseOptions());
176}
177
178namespace internal {
179// Internal helper class. Put in the header so we can write unit-tests for it.
180class PROTOBUF_EXPORT ZeroCopyStreamByteSink : public strings::ByteSink {
181 public:
182 explicit ZeroCopyStreamByteSink(io::ZeroCopyOutputStream* stream)
183 : stream_(stream), buffer_(NULL), buffer_size_(0) {}
184 ~ZeroCopyStreamByteSink();
185
186 void Append(const char* bytes, size_t len) override;
187
188 private:
189 io::ZeroCopyOutputStream* stream_;
190 void* buffer_;
191 int buffer_size_;
192
193 GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ZeroCopyStreamByteSink);
194};
195} // namespace internal
196
197} // namespace util
198} // namespace protobuf
199} // namespace google
200
201#include <google/protobuf/port_undef.inc>
202
203#endif // GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__
204

source code of include/google/protobuf/util/json_util.h