add voucher store

cmd/backoffice/fileserver.go

@@ -184,6 +184,34 @@ func (fs *FileServer) PromotionsHandler(w http.ResponseWriter, r *http.Request)
 	w.WriteHeader(http.StatusMethodNotAllowed)
 }
 
+func (fs *FileServer) VoucherHandler(w http.ResponseWriter, r *http.Request) {
+	fileName := filepath.Join(fs.dataDir, "vouchers.json")
+	if r.Method == http.MethodGet {
+		file, err := os.Open(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(w, file)
+		return
+	}
+	if r.Method == http.MethodPost {
+		file, err := os.Create(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(file, r.Body)
+		return
+	}
+
+	w.WriteHeader(http.StatusMethodNotAllowed)
+}
+
 func (fs *FileServer) PromotionPartHandler(w http.ResponseWriter, r *http.Request) {
 	idStr := r.PathValue("id")
 	if idStr == "" {

cmd/backoffice/main.go

@@ -90,6 +90,7 @@ func main() {
 	mux.HandleFunc("GET /carts", fs.CartsHandler)
 	mux.HandleFunc("GET /cart/{id}", fs.CartHandler)
 	mux.HandleFunc("/promotions", fs.PromotionsHandler)
+	mux.HandleFunc("/vouchers", fs.VoucherHandler)
 	mux.HandleFunc("/promotion/{id}", fs.PromotionPartHandler)
 
 	mux.HandleFunc("/ws", hub.ServeWS)