protostream_objectsource: preserve print options across Any.

Fixes #4771. Based on the solution included in the issues from
@wangjinhua.

Validated this works with Envoy's /config_dump JSON rendering.
Signed-off-by: Harvey Tuch <htuch@google.com>

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

@@ -648,6 +648,10 @@ Status ProtoStreamObjectSource::RenderAny(const ProtoStreamObjectSource* os,
   // using a nested ProtoStreamObjectSource using our nested type information.
   ProtoStreamObjectSource nested_os(&in_stream, os->typeinfo_, *nested_type);
 
+  nested_os.set_use_lower_camel_for_enums(os->use_lower_camel_for_enums_);
+  nested_os.set_use_ints_for_enums(os->use_ints_for_enums_);
+  nested_os.set_preserve_proto_field_names(os->preserve_proto_field_names_);
+
   // We manually call start and end object here so we can inject the @type.
   ow->StartObject(field_name);
   ow->RenderString("@type", type_url);

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

@@ -100,6 +100,7 @@ class ProtostreamObjectSourceTest
         ow_(&mock_),
         use_lower_camel_for_enums_(false),
         use_ints_for_enums_(false),
+        use_preserve_proto_field_names_(false),
         add_trailing_zeros_(false),
         render_unknown_enum_values_(true) {
     helper_.ResetTypeInfo(Book::descriptor(), Proto3Message::descriptor());
@@ -123,6 +124,7 @@ class ProtostreamObjectSourceTest
         helper_.NewProtoSource(&in_stream, GetTypeUrl(descriptor)));
     if (use_lower_camel_for_enums_) os->set_use_lower_camel_for_enums(true);
     if (use_ints_for_enums_) os->set_use_ints_for_enums(true);
+    if (use_preserve_proto_field_names_) os->set_preserve_proto_field_names(true);
     os->set_max_recursion_depth(64);
     return os->WriteTo(&mock_);
   }
@@ -272,6 +274,8 @@ class ProtostreamObjectSourceTest
 
   void UseIntsForEnums() { use_ints_for_enums_ = true; }
 
+  void UsePreserveProtoFieldNames() { use_preserve_proto_field_names_ = true; }
+
   void AddTrailingZeros() { add_trailing_zeros_ = true; }
 
   void SetRenderUnknownEnumValues(bool value) {
@@ -284,6 +288,7 @@ class ProtostreamObjectSourceTest
   ExpectingObjectWriter ow_;
   bool use_lower_camel_for_enums_;
   bool use_ints_for_enums_;
+  bool use_preserve_proto_field_names_;
   bool add_trailing_zeros_;
   bool render_unknown_enum_values_;
 };
@@ -536,6 +541,16 @@ TEST_P(ProtostreamObjectSourceTest, UseIntsForEnumsTest) {
   DoTest(book, Book::descriptor());
 }
 
+TEST_P(ProtostreamObjectSourceTest, UsePreserveProtoFieldNames) {
+  Book book;
+  book.set_snake_field("foo");
+
+  UsePreserveProtoFieldNames();
+
+  ow_.StartObject("")->RenderString("snake_field", "foo")->EndObject();
+  DoTest(book, Book::descriptor());
+}
+
 TEST_P(ProtostreamObjectSourceTest,
        UnknownEnumAreDroppedWhenRenderUnknownEnumValuesIsUnset) {
   Proto3Message message;
@@ -769,6 +784,69 @@ TEST_P(ProtostreamObjectSourceAnysTest, BasicAny) {
   DoTest(out, AnyOut::descriptor());
 }
 
+TEST_P(ProtostreamObjectSourceAnysTest, LowerCamelEnumOutputSnakeCase) {
+  AnyOut out;
+  ::google::protobuf::Any* any = out.mutable_any();
+
+  Book book;
+  book.set_type(Book::arts_and_photography);
+  any->PackFrom(book);
+
+  UseLowerCamelForEnums();
+
+  ow_.StartObject("")
+      ->StartObject("any")
+      ->RenderString("@type",
+                     "type.googleapis.com/google.protobuf.testing.Book")
+      ->RenderString("type", "artsAndPhotography")
+      ->EndObject()
+      ->EndObject();
+
+  DoTest(out, AnyOut::descriptor());
+}
+
+TEST_P(ProtostreamObjectSourceAnysTest, UseIntsForEnumsTest) {
+  AnyOut out;
+  ::google::protobuf::Any* any = out.mutable_any();
+
+  Book book;
+  book.set_type(Book::ACTION_AND_ADVENTURE);
+  any->PackFrom(book);
+
+  UseIntsForEnums();
+
+  ow_.StartObject("")
+      ->StartObject("any")
+      ->RenderString("@type",
+                     "type.googleapis.com/google.protobuf.testing.Book")
+      ->RenderInt32("type", 3)
+      ->EndObject()
+      ->EndObject();
+
+  DoTest(out, AnyOut::descriptor());
+}
+
+TEST_P(ProtostreamObjectSourceAnysTest, UsePreserveProtoFieldNames) {
+  AnyOut out;
+  ::google::protobuf::Any* any = out.mutable_any();
+
+  Book book;
+  book.set_snake_field("foo");
+  any->PackFrom(book);
+
+  UsePreserveProtoFieldNames();
+
+  ow_.StartObject("")
+      ->StartObject("any")
+      ->RenderString("@type",
+                     "type.googleapis.com/google.protobuf.testing.Book")
+      ->RenderString("snake_field", "foo")
+      ->EndObject()
+      ->EndObject();
+
+  DoTest(out, AnyOut::descriptor());
+}
+
 TEST_P(ProtostreamObjectSourceAnysTest, RecursiveAny) {
   AnyOut out;
   ::google::protobuf::Any* any = out.mutable_any();

src/google/protobuf/util/internal/testdata/books.proto

@@ -69,6 +69,9 @@ message Book {
   }
   optional Type type = 11;
 
+  // Useful for testing JSON snake/camel-case conversions.
+  optional string snake_field = 12;
+
   extensions 200 to 499;
 }