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jsonUtil.go
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jsonUtil.go
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package server
import (
"encoding/json"
"fmt"
"github.com/pkg/errors"
"gopkg.in/go-playground/validator.v9"
"io/ioutil"
"net/http"
)
const contentTypeHeader string = "Content-Type"
var jsonContentTypeValue = []string{"application/json; charset=utf-8"}
var jsContentTypeValue = []string{"application/javascript; charset=utf-8"}
// use a single instance of Validate, it caches struct info
var validate = validator.New()
//WriteJSON serializes body to provided writer
func WriteJSON(status int, body interface{}, w http.ResponseWriter) error {
header := w.Header()
if val := header[contentTypeHeader]; len(val) == 0 {
header[contentTypeHeader] = jsonContentTypeValue
}
w.WriteHeader(status)
return json.NewEncoder(w).Encode(body)
}
//WriteJSONP serializes body as JSONP
func WriteJSONP(status int, body interface{}, callback string, w http.ResponseWriter) error {
header := w.Header()
if val := header[contentTypeHeader]; len(val) == 0 {
header[contentTypeHeader] = jsContentTypeValue
}
jsonArr, err := json.Marshal(body)
if nil != err {
return err
}
w.WriteHeader(status)
_, err = w.Write([]byte(fmt.Sprintf("%s(%s);", callback, jsonArr)))
return err
}
//ReadJSON reads
func ReadJSON(rq *http.Request, val interface{}) error {
defer rq.Body.Close()
rqBody, err := ioutil.ReadAll(rq.Body)
if err != nil {
return errors.Wrap(err, "Cannot read request body")
}
err = json.Unmarshal(rqBody, val)
if err != nil {
return errors.Wrap(err, "Cannot unmarshal request")
}
return err
}
//Validate validates struct
func Validate(val interface{}) error {
err := validate.Struct(val)
if nil != err {
return errors.Wrap(err, "Struct validation has failed")
}
return nil
}