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json_proto_binder.go
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json_proto_binder.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// 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 binder
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/reflect/protoreflect"
)
type JSONProtoBinder struct{}
func (JSONProtoBinder) Name() string {
return "json"
}
func (b JSONProtoBinder) Bind(req *http.Request, obj interface{}) error {
if req == nil || req.Body == nil {
return fmt.Errorf("invalid request")
}
body, err := io.ReadAll(req.Body)
if err != nil {
return err
}
return b.BindBody(body, obj)
}
func (JSONProtoBinder) BindBody(body []byte, obj interface{}) error {
if m, ok := obj.(protoreflect.ProtoMessage); ok {
err := protojson.UnmarshalOptions{DiscardUnknown: true}.Unmarshal(body, m)
// In order to be compatible with the following situations:
// {"annotations":{"name":null}}
// protojson cannot resolve null in the map. If protojson fails to parse, it will be parsed again with normal json.
if err == nil {
return err
}
}
return decodeJSON(bytes.NewReader(body), obj)
}
func decodeJSON(r io.Reader, obj interface{}) error {
decoder := json.NewDecoder(r)
decoder.DisallowUnknownFields()
if err := decoder.Decode(obj); err != nil {
return err
}
return nil
}