change: refractored and seperated all code into different parts

Backend/endpoints/time.go

@@ -0,0 +1,82 @@
+package endpoints
+
+import (
+	"arbeitszeitmessung/helper"
+	"arbeitszeitmessung/models"
+	"encoding/json"
+	"log"
+	"net/http"
+	"strconv"
+)
+
+// Frontend relevant backend functionality -> not used by the arduino devices
+func TimeHandler(w http.ResponseWriter, r *http.Request) {
+	helper.SetCors(w)
+	switch r.Method {
+	case "GET":
+		getBookings(w, r)
+	case "UPDATE":
+		updateBooking(w, r)
+	case "OPTIONS":
+		// just support options header for non GET Requests from SWAGGER
+		w.WriteHeader(http.StatusOK)
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+
+// Returns bookings from DB with similar card uid -> checks for card uid in http query params
+func getBookings(w http.ResponseWriter, r *http.Request) {
+	card_uid := r.URL.Query().Get("card_uid")
+	if card_uid == "" {
+		http.Error(w, "Missing cardID query parameter", http.StatusBadRequest)
+		return
+	}
+	bookings, err := (*models.Booking).GetBookingsByCardID(nil, card_uid)
+	if err != nil {
+		log.Println("Error getting bookings: ", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(bookings)
+}
+
+// Updates a booking form the given json body
+func updateBooking(w http.ResponseWriter, r *http.Request) {
+	_booking_id := r.URL.Query().Get("counter_id")
+	if _booking_id == "" {
+		http.Error(w, "Missing bookingID query parameter", http.StatusBadRequest)
+		return
+	}
+	booking_id, err := strconv.Atoi(_booking_id)
+	if err != nil {
+		http.Error(w, "Invalid bookingID query parameter", http.StatusBadRequest)
+		return
+	}
+	_booking, err := (*models.Booking).GetBookingById(nil, booking_id)
+	if err != nil {
+		log.Println("Error getting booking: ", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	var booking models.Booking
+	dec := json.NewDecoder(r.Body)
+	dec.DisallowUnknownFields()
+	err = dec.Decode(&booking)
+	if err != nil {
+		log.Println("Error parsing booking: ", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	if booking.CounterId != 0 && booking.CounterId != _booking.CounterId {
+		log.Println("Booking Ids do not match")
+		http.Error(w, "Booking Ids do not match", http.StatusBadRequest)
+		return
+	}
+	_booking.Update(booking)
+	_booking.Save()
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(_booking)
+}