| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You 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" |
| ) |
| |
| import ( |
| "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 |
| } |