feat(server/pay): 优惠套餐(Promo SKU)每账号限购一次——已付过再下单 409 PROMO_ALREADY_USED

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu
2026-07-13 11:36:24 +08:00
parent 92943258ab
commit 1c2ec2844d
3 changed files with 106 additions and 0 deletions
@@ -125,6 +125,21 @@ func (h *Handler) CreateOrder(w http.ResponseWriter, r *http.Request) {
 		return
 	}

+	// 优惠档(Promo SKU)每账号限购一次:该用户已有该 SKU 的 paid 台账则拒单,
+	// 不打上游(真机实测发现用户可反复购买优惠档)。Retry/Cancel 不受限——恢复原单不受限。
+	if item.Promo {
+		used, err := h.store.HasPaidPurchase(ctx, uid, req.SKU)
+		if err != nil {
+			apierr.WriteJSON(w, http.StatusInternalServerError, apierr.ErrInternal)
+			return
+		}
+		if used {
+			apierr.WriteJSON(w, http.StatusConflict,
+				apierr.New("PROMO_ALREADY_USED", "优惠套餐每个账号限购一次，你已购买过", "This promotional plan is limited to one per account and you have already purchased it"))
+			return
+		}
+	}
+
 	res, err := h.client.CreateOrder(ctx, req.SKU, req.Method, bizRef, filterMetadata(req.Metadata))
 	if err != nil {
 		writePayErr(w, err)