frontend: move time in a separate package to be used elsewhere

frontend/time/time.go

@@ -0,0 +1,33 @@
+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) {
+	log.Printf("Handling %s request from %s: %s [%s]\n", r.Method, r.RemoteAddr, 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)
+	}
+}