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json_marshaler.go
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/
json_marshaler.go
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// Copyright 2020 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"
"google.golang.org/protobuf/reflect/protoreflect"
)
type jsonMarshaler struct {
resolver Resolver
indent string
useProtoNames bool
}
func newJSONMarshaler(resolver Resolver, indent string, useProtoNames bool) Marshaler {
return &jsonMarshaler{
resolver: resolver,
indent: indent,
useProtoNames: useProtoNames,
}
}
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,
Indent: m.indent,
UseProtoNames: m.useProtoNames,
}
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 err := json.Compact(buffer, data); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
func reparseUnrecognized(resolver Resolver, reflectMessage protoreflect.Message) error {
if resolver == nil {
return nil
}
unknown := reflectMessage.GetUnknown()
if len(unknown) > 0 {
reflectMessage.SetUnknown(nil)
options := proto.UnmarshalOptions{
Resolver: resolver,
Merge: true,
}
if err := options.Unmarshal(unknown, reflectMessage.Interface()); err != nil {
return err
}
}
var err error
reflectMessage.Range(func(fieldDescriptor protoreflect.FieldDescriptor, value protoreflect.Value) bool {
err = reparseUnrecognizedInField(resolver, fieldDescriptor, value)
return err == nil
})
return err
}
func reparseUnrecognizedInField(resolver Resolver, fieldDescriptor protoreflect.FieldDescriptor, value protoreflect.Value) error {
if fieldDescriptor.IsMap() {
valDesc := fieldDescriptor.MapValue()
if valDesc.Kind() != protoreflect.MessageKind && valDesc.Kind() != protoreflect.GroupKind {
// nothing to reparse
return nil
}
var err error
value.Map().Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
err = reparseUnrecognized(resolver, v.Message())
return err == nil
})
return err
}
if fieldDescriptor.Kind() != protoreflect.MessageKind && fieldDescriptor.Kind() != protoreflect.GroupKind {
// nothing to reparse
return nil
}
if fieldDescriptor.IsList() {
list := value.List()
for i := 0; i < list.Len(); i++ {
if err := reparseUnrecognized(resolver, list.Get(i).Message()); err != nil {
return err
}
}
return nil
}
return reparseUnrecognized(resolver, value.Message())
}