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json_marshaler.go
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/
json_marshaler.go
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// Copyright 2020-2023 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package protoencoding
import (
"bytes"
"encoding/json"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
type jsonMarshaler struct {
resolver Resolver
indent string
useProtoNames bool
emitUnpopulated bool
}
func newJSONMarshaler(resolver Resolver, options ...JSONMarshalerOption) Marshaler {
jsonMarshaler := &jsonMarshaler{
resolver: resolver,
}
for _, option := range options {
option(jsonMarshaler)
}
return jsonMarshaler
}
func (m *jsonMarshaler) Marshal(message proto.Message) ([]byte, error) {
if err := ReparseUnrecognized(m.resolver, message.ProtoReflect()); err != nil {
return nil, err
}
options := protojson.MarshalOptions{
Resolver: m.resolver,
UseProtoNames: m.useProtoNames,
EmitUnpopulated: m.emitUnpopulated,
}
data, err := options.Marshal(message)
if err != nil {
return nil, err
}
// This is needed due to the instability of protojson output.
//
// https://github.com/golang/protobuf/issues/1121
// https://go-review.googlesource.com/c/protobuf/+/151340
// https://developers.google.com/protocol-buffers/docs/reference/go/faq#unstable-json
//
// We may need to do a full encoding/json encode/decode in the future if protojson
// produces non-deterministic output.
buffer := bytes.NewBuffer(nil)
if m.indent != "" {
if err := json.Indent(buffer, data, "", m.indent); err != nil {
return nil, err
}
} else {
if err := json.Compact(buffer, data); err != nil {
return nil, err
}
}
return buffer.Bytes(), nil
}