server_helper/util/json.go

package util

import (
	"compress/gzip"
	"encoding/json"
	"net/http"
	"strings"
)

func Json(fn func(http.ResponseWriter, *http.Request) Return) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// w.Header().Set("Content-Type", "application/json")
		// if r.Method == "OPTIONS" {
		// 	WriteResponse(w, http.StatusOK, "Ok", "Ok")
		// 	return
		// }
		var rt interface{}
		var enc *json.Encoder
		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
			rt = fn(w, r)
			enc = json.NewEncoder(w)
		} else {
			w.Header().Set("Content-Encoding", "gzip")
			gz := gzip.NewWriter(w)
			defer gz.Close()
			rt = fn(w, r)
			enc = json.NewEncoder(gz)
		}
		// Encode result
		if err := enc.Encode(&rt); nil != err {
			WriteResponse(w, http.StatusBadRequest, "Error", err.Error())
		}
	})
}