handle checkout resume

main.go

@@ -199,37 +199,48 @@ func main() {
 		w.Write([]byte("ok"))
 	})
 	mux.HandleFunc("/checkout", func(w http.ResponseWriter, r *http.Request) {
-		cookie, err := r.Cookie("cartid")
-		if err != nil {
-			w.WriteHeader(http.StatusBadRequest)
-			w.Write([]byte(err.Error()))
-			return
-		}
-		if cookie.Value == "" {
-			w.WriteHeader(http.StatusBadRequest)
-			w.Write([]byte("no cart id to checkout is empty"))
-			return
-		}
-		cartId := ToCartId(cookie.Value)
-		reply, err := syncedServer.pool.Process(cartId, Message{
-			Type: CreateCheckoutOrderType,
-			Content: &messages.CreateCheckoutOrder{
-				Terms:        "https://slask-finder.tornberg.me/terms",
-				Checkout:     "https://slask-finder.tornberg.me/checkout?order_id={checkout.order.id}",
-				Confirmation: "https://slask-finder.tornberg.me/confirmation/{checkout.order.id}",
-				Push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
-			},
-		})
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(err.Error()))
-		}
-		order := CheckoutOrder{}
-		err = json.Unmarshal(reply.Payload, &order)
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(err.Error()))
-			return
+		orderId := r.URL.Query().Get("order_id")
+		order := &CheckoutOrder{}
+		if orderId == "" {
+			cookie, err := r.Cookie("cartid")
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				w.Write([]byte(err.Error()))
+				return
+			}
+			if cookie.Value == "" {
+				w.WriteHeader(http.StatusBadRequest)
+				w.Write([]byte("no cart id to checkout is empty"))
+				return
+			}
+			cartId := ToCartId(cookie.Value)
+			reply, err := syncedServer.pool.Process(cartId, Message{
+				Type: CreateCheckoutOrderType,
+				Content: &messages.CreateCheckoutOrder{
+					Terms:        "https://slask-finder.tornberg.me/terms",
+					Checkout:     "https://slask-finder.tornberg.me/checkout?order_id={checkout.order.id}",
+					Confirmation: "https://slask-finder.tornberg.me/confirmation/{checkout.order.id}",
+					Push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
+				},
+			})
+			if err != nil {
+				w.WriteHeader(http.StatusInternalServerError)
+				w.Write([]byte(err.Error()))
+			}
+			err = json.Unmarshal(reply.Payload, &order)
+			if err != nil {
+				w.WriteHeader(http.StatusInternalServerError)
+				w.Write([]byte(err.Error()))
+				return
+			}
+		} else {
+			prevOrder, err := KlarnaInstance.GetOrder(orderId)
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				w.Write([]byte(err.Error()))
+				return
+			}
+			order = prevOrder
 		}
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
 		w.WriteHeader(http.StatusOK)