Add JsonParseOptions to ignore unknown fields

- add JsonParseOptions for JsonToBinaryString allow unknown fields
- rename current JsonOptions to JsonPrintOptions

src/google/protobuf/util/internal/proto_writer.cc

@@ -71,6 +71,7 @@ ProtoWriter::ProtoWriter(TypeResolver* type_resolver,
       adapter_(&buffer_),
       stream_(new CodedOutputStream(&adapter_)),
       listener_(listener),
+      ignore_unknown_fields_(false),
       invalid_depth_(0),
       tracker_(new ObjectLocationTracker()) {}
 
@@ -88,6 +89,7 @@ ProtoWriter::ProtoWriter(const TypeInfo* typeinfo,
       adapter_(&buffer_),
       stream_(new CodedOutputStream(&adapter_)),
       listener_(listener),
+      ignore_unknown_fields_(false),
       invalid_depth_(0),
       tracker_(new ObjectLocationTracker()) {}
 
@@ -692,7 +694,9 @@ const google::protobuf::Field* ProtoWriter::Lookup(
   }
   const google::protobuf::Field* field =
       typeinfo_->FindField(&e->type(), unnormalized_name);
-  if (field == NULL) InvalidName(unnormalized_name, "Cannot find field.");
+  if (field == NULL && !ignore_unknown_fields_) {
+    InvalidName(unnormalized_name, "Cannot find field.");
+  }
   return field;
 }
 

src/google/protobuf/util/internal/proto_writer.h

@@ -142,6 +142,10 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
 
   const TypeInfo* typeinfo() { return typeinfo_; }
 
+  void set_ignore_unknown_fields(bool ignore_unknown_fields) {
+    ignore_unknown_fields_ = ignore_unknown_fields;
+  }
+
  protected:
   class LIBPROTOBUF_EXPORT ProtoElement : public BaseElement, public LocationTrackerInterface {
    public:
@@ -240,7 +244,8 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
 
   // Lookup the field in the current element. Looks in the base descriptor
   // and in any extension. This will report an error if the field cannot be
-  // found or if multiple matching extensions are found.
+  // found when ignore_unknown_names_ is false or if multiple matching
+  // extensions are found.
   const google::protobuf::Field* Lookup(StringPiece name);
 
   // Lookup the field type in the type descriptor. Returns NULL if the type
@@ -293,6 +298,9 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   // Indicates whether we finished writing root message completely.
   bool done_;
 
+  // If true, don't report unknown field names to the listener.
+  bool ignore_unknown_fields_;
+
   // Variable for internal state processing:
   // element_    : the current element.
   // size_insert_: sizes of nested messages.

src/google/protobuf/util/internal/protostream_objectwriter.cc

@@ -63,7 +63,9 @@ ProtoStreamObjectWriter::ProtoStreamObjectWriter(
     : ProtoWriter(type_resolver, type, output, listener),
       master_type_(type),
       current_(NULL),
-      options_(options) {}
+      options_(options) {
+  set_ignore_unknown_fields(options_.ignore_unknown_fields);
+}
 
 ProtoStreamObjectWriter::ProtoStreamObjectWriter(
     const TypeInfo* typeinfo, const google::protobuf::Type& type,

src/google/protobuf/util/internal/protostream_objectwriter.h

@@ -83,7 +83,12 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectWriter : public ProtoWriter {
     // preserve integer precision.
     bool struct_integers_as_strings;
 
-    Options() : struct_integers_as_strings(false) {}
+    // Not treat unknown fields as an error. If there is an unknown fields,
+    // just ignore it and continue to process the rest.
+    bool ignore_unknown_fields;
+
+    Options()
+        : struct_integers_as_strings(false), ignore_unknown_fields(false) {}
 
     // Default instance of Options with all options set to defaults.
     static const Options& Defaults() {

src/google/protobuf/util/internal/protostream_objectwriter_test.cc

@@ -183,6 +183,10 @@ class ProtoStreamObjectWriterTest : public BaseProtoStreamObjectWriterTest {
   ProtoStreamObjectWriterTest()
       : BaseProtoStreamObjectWriterTest(Book::descriptor()) {}
 
+  void ResetProtoWriter() {
+    ResetTypeInfo(Book::descriptor());
+  }
+
   virtual ~ProtoStreamObjectWriterTest() {}
 };
 
@@ -709,6 +713,119 @@ TEST_P(ProtoStreamObjectWriterTest, UnknownListAtPublisher) {
   CheckOutput(expected);
 }
 
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownFieldAtRoot) {
+  Book empty;
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, _, _)).Times(0);
+  ow_->StartObject("")->RenderString("unknown", "Nope!")->EndObject();
+  CheckOutput(empty, 0);
+}
+
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownFieldAtAuthorFriend) {
+  Book expected;
+  Author* paul = expected.mutable_author();
+  paul->set_name("Paul");
+  Author* mark = paul->add_friend_();
+  mark->set_name("Mark");
+  Author* john = paul->add_friend_();
+  john->set_name("John");
+  Author* luke = paul->add_friend_();
+  luke->set_name("Luke");
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, _, _)).Times(0);
+  ow_->StartObject("")
+      ->StartObject("author")
+      ->RenderString("name", "Paul")
+      ->StartList("friend")
+      ->StartObject("")
+      ->RenderString("name", "Mark")
+      ->EndObject()
+      ->StartObject("")
+      ->RenderString("name", "John")
+      ->RenderString("address", "Patmos")
+      ->EndObject()
+      ->StartObject("")
+      ->RenderString("name", "Luke")
+      ->EndObject()
+      ->EndList()
+      ->EndObject()
+      ->EndObject();
+  CheckOutput(expected);
+}
+
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownObjectAtRoot) {
+  Book empty;
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, StringPiece("unknown"),
+                                     StringPiece("Cannot find field.")))
+      .Times(0);
+  ow_->StartObject("")->StartObject("unknown")->EndObject()->EndObject();
+  CheckOutput(empty, 0);
+}
+
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownObjectAtAuthor) {
+  Book expected;
+  Author* author = expected.mutable_author();
+  author->set_name("William");
+  author->add_pseudonym("Bill");
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, _, _)).Times(0);
+  ow_->StartObject("")
+      ->StartObject("author")
+      ->RenderString("name", "William")
+      ->StartObject("wife")
+      ->RenderString("name", "Hilary")
+      ->EndObject()
+      ->RenderString("pseudonym", "Bill")
+      ->EndObject()
+      ->EndObject();
+  CheckOutput(expected);
+}
+
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownListAtRoot) {
+  Book empty;
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, _, _)).Times(0);
+  ow_->StartObject("")->StartList("unknown")->EndList()->EndObject();
+  CheckOutput(empty, 0);
+}
+
+TEST_P(ProtoStreamObjectWriterTest, IgnoreUnknownListAtPublisher) {
+  Book expected;
+  expected.set_title("Brainwashing");
+  Publisher* publisher = expected.mutable_publisher();
+  publisher->set_name("propaganda");
+
+  options_.ignore_unknown_fields = true;
+  ResetProtoWriter();
+
+  EXPECT_CALL(listener_, InvalidName(_, _, _)).Times(0);
+  ow_->StartObject("")
+      ->StartObject("publisher")
+      ->RenderString("name", "propaganda")
+      ->StartList("alliance")
+      ->EndList()
+      ->EndObject()
+      ->RenderString("title", "Brainwashing")
+      ->EndObject();
+  CheckOutput(expected);
+}
+
 TEST_P(ProtoStreamObjectWriterTest, MissingRequiredField) {
   Book expected;
   expected.set_title("My Title");

src/google/protobuf/util/json_util.cc

@@ -74,7 +74,7 @@ util::Status BinaryToJsonStream(TypeResolver* resolver,
                                   const string& type_url,
                                   io::ZeroCopyInputStream* binary_input,
                                   io::ZeroCopyOutputStream* json_output,
-                                  const JsonOptions& options) {
+                                  const JsonPrintOptions& options) {
   io::CodedInputStream in_stream(binary_input);
   google::protobuf::Type type;
   RETURN_IF_ERROR(resolver->ResolveMessageType(type_url, &type));
@@ -95,7 +95,7 @@ util::Status BinaryToJsonString(TypeResolver* resolver,
                                   const string& type_url,
                                   const string& binary_input,
                                   string* json_output,
-                                  const JsonOptions& options) {
+                                  const JsonPrintOptions& options) {
   io::ArrayInputStream input_stream(binary_input.data(), binary_input.size());
   io::StringOutputStream output_stream(json_output);
   return BinaryToJsonStream(resolver, type_url, &input_stream, &output_stream,
@@ -141,13 +141,17 @@ class StatusErrorListener : public converter::ErrorListener {
 util::Status JsonToBinaryStream(TypeResolver* resolver,
                                   const string& type_url,
                                   io::ZeroCopyInputStream* json_input,
-                                  io::ZeroCopyOutputStream* binary_output) {
+                                  io::ZeroCopyOutputStream* binary_output,
+                                  const JsonParseOptions& options) {
   google::protobuf::Type type;
   RETURN_IF_ERROR(resolver->ResolveMessageType(type_url, &type));
   internal::ZeroCopyStreamByteSink sink(binary_output);
   StatusErrorListener listener;
+  converter::ProtoStreamObjectWriter::Options proto_writer_options;
+  proto_writer_options.ignore_unknown_fields = options.ignore_unknown_fields;
   converter::ProtoStreamObjectWriter proto_writer(resolver, type, &sink,
-                                                  &listener);
+                                                  &listener,
+                                                  proto_writer_options);
 
   converter::JsonStreamParser parser(&proto_writer);
   const void* buffer;
@@ -165,10 +169,12 @@ util::Status JsonToBinaryStream(TypeResolver* resolver,
 util::Status JsonToBinaryString(TypeResolver* resolver,
                                   const string& type_url,
                                   const string& json_input,
-                                  string* binary_output) {
+                                  string* binary_output,
+                                  const JsonParseOptions& options) {
   io::ArrayInputStream input_stream(json_input.data(), json_input.size());
   io::StringOutputStream output_stream(binary_output);
-  return JsonToBinaryStream(resolver, type_url, &input_stream, &output_stream);
+  return JsonToBinaryStream(
+      resolver, type_url, &input_stream, &output_stream, options);
 }
 
 }  // namespace util

src/google/protobuf/util/json_util.h

@@ -44,7 +44,14 @@ class ZeroCopyOutputStream;
 }  // namespace io
 namespace util {
 
-struct JsonOptions {
+struct JsonParseOptions {
+  // Whether to ignore unknown JSON fields during parsing
+  bool ignore_unknown_fields;
+
+  JsonParseOptions() : ignore_unknown_fields(false) {}
+};
+
+struct JsonPrintOptions {
   // Whether to add spaces, line breaks and indentation to make the JSON output
   // easy to read.
   bool add_whitespace;
@@ -54,11 +61,14 @@ struct JsonOptions {
   // behavior and print primitive fields regardless of their values.
   bool always_print_primitive_fields;
 
-  JsonOptions() : add_whitespace(false),
-                  always_print_primitive_fields(false) {
+  JsonPrintOptions() : add_whitespace(false),
+                       always_print_primitive_fields(false) {
   }
 };
 
+// DEPRECATED. Use JsonPrintOptions instead.
+typedef JsonPrintOptions JsonOptions;
+
 // Converts protobuf binary data to JSON.
 // The conversion will fail if:
 //   1. TypeResolver fails to resolve a type.
@@ -70,14 +80,14 @@ util::Status BinaryToJsonStream(
     const string& type_url,
     io::ZeroCopyInputStream* binary_input,
     io::ZeroCopyOutputStream* json_output,
-    const JsonOptions& options);
+    const JsonPrintOptions& options);
 
 inline util::Status BinaryToJsonStream(
     TypeResolver* resolver, const string& type_url,
     io::ZeroCopyInputStream* binary_input,
     io::ZeroCopyOutputStream* json_output) {
   return BinaryToJsonStream(resolver, type_url, binary_input, json_output,
-                            JsonOptions());
+                            JsonPrintOptions());
 }
 
 LIBPROTOBUF_EXPORT util::Status BinaryToJsonString(
@@ -85,14 +95,14 @@ LIBPROTOBUF_EXPORT util::Status BinaryToJsonString(
     const string& type_url,
     const string& binary_input,
     string* json_output,
-    const JsonOptions& options);
+    const JsonPrintOptions& options);
 
 inline util::Status BinaryToJsonString(TypeResolver* resolver,
                                          const string& type_url,
                                          const string& binary_input,
                                          string* json_output) {
   return BinaryToJsonString(resolver, type_url, binary_input, json_output,
-                            JsonOptions());
+                            JsonPrintOptions());
 }
 
 // Converts JSON data to protobuf binary format.
@@ -100,18 +110,37 @@ inline util::Status BinaryToJsonString(TypeResolver* resolver,
 //   1. TypeResolver fails to resolve a type.
 //   2. input is not valid JSON format, or conflicts with the type
 //      information returned by TypeResolver.
-//   3. input has unknown fields.
 util::Status JsonToBinaryStream(
     TypeResolver* resolver,
     const string& type_url,
     io::ZeroCopyInputStream* json_input,
-    io::ZeroCopyOutputStream* binary_output);
+    io::ZeroCopyOutputStream* binary_output,
+    const JsonParseOptions& options);
+
+inline util::Status JsonToBinaryStream(
+    TypeResolver* resolver,
+    const string& type_url,
+    io::ZeroCopyInputStream* json_input,
+    io::ZeroCopyOutputStream* binary_output) {
+  return JsonToBinaryStream(resolver, type_url, json_input, binary_output,
+                            JsonParseOptions());
+}
 
 LIBPROTOBUF_EXPORT util::Status JsonToBinaryString(
     TypeResolver* resolver,
     const string& type_url,
     const string& json_input,
-    string* binary_output);
+    string* binary_output,
+    const JsonParseOptions& options);
+
+inline util::Status JsonToBinaryString(
+    TypeResolver* resolver,
+    const string& type_url,
+    const string& json_input,
+    string* binary_output) {
+  return JsonToBinaryString(resolver, type_url, json_input, binary_output,
+                            JsonParseOptions());
+}
 
 namespace internal {
 // Internal helper class. Put in the header so we can write unit-tests for it.

src/google/protobuf/util/json_util_test.cc

@@ -67,7 +67,7 @@ class JsonUtilTest : public testing::Test {
         kTypeUrlPrefix, DescriptorPool::generated_pool()));
   }
 
-  string ToJson(const Message& message, const JsonOptions& options) {
+  string ToJson(const Message& message, const JsonPrintOptions& options) {
     string result;
     GOOGLE_CHECK_OK(BinaryToJsonString(resolver_.get(),
                                 GetTypeUrl(message.GetDescriptor()),
@@ -75,10 +75,12 @@ class JsonUtilTest : public testing::Test {
     return result;
   }
 
-  bool FromJson(const string& json, Message* message) {
+  bool FromJson(const string& json, Message* message,
+                const JsonParseOptions& options) {
     string binary;
     if (!JsonToBinaryString(resolver_.get(),
-                            GetTypeUrl(message->GetDescriptor()), json, &binary)
+                            GetTypeUrl(message->GetDescriptor()), json, &binary,
+                            options)
              .ok()) {
       return false;
     }
@@ -92,7 +94,7 @@ TEST_F(JsonUtilTest, TestWhitespaces) {
   TestMessage m;
   m.mutable_message_value();
 
-  JsonOptions options;
+  JsonPrintOptions options;
   EXPECT_EQ("{\"messageValue\":{}}", ToJson(m, options));
   options.add_whitespace = true;
   EXPECT_EQ(
@@ -104,7 +106,7 @@ TEST_F(JsonUtilTest, TestWhitespaces) {
 
 TEST_F(JsonUtilTest, TestDefaultValues) {
   TestMessage m;
-  JsonOptions options;
+  JsonPrintOptions options;
   EXPECT_EQ("{}", ToJson(m, options));
   options.always_print_primitive_fields = true;
   EXPECT_EQ(
@@ -147,8 +149,9 @@ TEST_F(JsonUtilTest, ParseMessage) {
       "    {\"value\": 40}, {\"value\": 96}\n"
       "  ]\n"
       "}\n";
+  JsonParseOptions options;
   TestMessage m;
-  ASSERT_TRUE(FromJson(input, &m));
+  ASSERT_TRUE(FromJson(input, &m, options));
   EXPECT_EQ(1024, m.int32_value());
   ASSERT_EQ(2, m.repeated_int32_value_size());
   EXPECT_EQ(1, m.repeated_int32_value(0));
@@ -162,20 +165,28 @@ TEST_F(JsonUtilTest, ParseMessage) {
 TEST_F(JsonUtilTest, ParseMap) {
   TestMap message;
   (*message.mutable_string_map())["hello"] = 1234;
-  JsonOptions options;
-  EXPECT_EQ("{\"stringMap\":{\"hello\":1234}}", ToJson(message, options));
+  JsonPrintOptions print_options;
+  JsonParseOptions parse_options;
+  EXPECT_EQ("{\"stringMap\":{\"hello\":1234}}", ToJson(message, print_options));
   TestMap other;
-  ASSERT_TRUE(FromJson(ToJson(message, options), &other));
+  ASSERT_TRUE(FromJson(ToJson(message, print_options), &other, parse_options));
   EXPECT_EQ(message.DebugString(), other.DebugString());
 }
 
+TEST_F(JsonUtilTest, TestParseIgnoreUnknownFields) {
+  TestMessage m;
+  JsonParseOptions options;
+  options.ignore_unknown_fields = true;
+  EXPECT_TRUE(FromJson("{\"unknownName\":0}", &m, options));
+}
+
 TEST_F(JsonUtilTest, TestParseErrors) {
   TestMessage m;
-  JsonOptions options;
+  JsonParseOptions options;
   // Parsing should fail if the field name can not be recognized.
-  EXPECT_FALSE(FromJson("{\"unknownName\":0}", &m));
+  EXPECT_FALSE(FromJson("{\"unknownName\":0}", &m, options));
   // Parsing should fail if the value is invalid.
-  EXPECT_FALSE(FromJson("{\"int32Value\":2147483648}", &m));
+  EXPECT_FALSE(FromJson("{\"int32Value\":2147483648}", &m, options));
 }
 
 typedef pair<char*, int> Segment;