server/frontend/time/time.go

package time

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"time"
)

var ChallengeStart time.Time
var ChallengeEnd time.Time = time.Unix(0, 0)

type TimeHandler struct {}

type timeObject struct {
	Started  int64 `json:"st"`
	Time     int64 `json:"cu"`
	Duration int   `json:"du"`
}

func (t TimeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
		r.RemoteAddr = addr
	}
	log.Printf("%s \"%s %s\" [%s]\n", r.RemoteAddr, r.Method, r.URL.Path, r.UserAgent())

	w.Header().Set("Content-Type", "application/json")

	if j, err := json.Marshal(timeObject{ChallengeStart.Unix(), time.Now().Unix(), int(ChallengeEnd.Sub(ChallengeStart).Seconds())}); err != nil {
		http.Error(w, fmt.Sprintf("{\"errmsg\":%q}", err), http.StatusInternalServerError)
	} else {
		w.WriteHeader(http.StatusOK)
		w.Write(j)
	}
}