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render.go
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render.go
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/*
* Copyright (c) 2017. Harrison Zhu <wcg6121@gmail.com>
* This file is part of djob <https://github.com/HZ89/djob>.
*
* djob is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* djob is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with djob. If not, see <http://www.gnu.org/licenses/>.
*/
package api
import (
"bytes"
"net/http"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
)
var jsonContentType = []string{"application/json; charset=utf-8"}
//jsonString implement output a protobuf obj as a json string and json content type
type pbjson struct {
data interface{}
}
func (j pbjson) Render(w http.ResponseWriter) error {
var buf bytes.Buffer
marshaler := &jsonpb.Marshaler{EmitDefaults: true}
if err := marshaler.Marshal(&buf, j.data.(proto.Message)); err != nil {
return err
}
header := w.Header()
header["Content-Type"] = jsonContentType
w.Write(buf.Bytes())
return nil
}
func (j pbjson) WriteContentType(w http.ResponseWriter) {
header := w.Header()
if val := header["Content-Type"]; len(val) == 0 {
header["Content-Type"] = jsonContentType
}
}