fix: P1 activation path hardening - Bug 4-9

Bug 4: resolveRenewalActivationSubscription - add fallback by user_id+subscribe_id
  with SELECT FOR UPDATE when token lookup fails

Bug 5: appleIAPNotifyLogic - return error on product ID mapping failure instead of
  silently dropping the notification

Bug 6: NewPurchase fallback query - wrap in transaction with SELECT FOR UPDATE to
  prevent concurrent duplicate subscription creation

Bug 7: appleIAPNotifyLogic - fix UserId=0 by reverse-lookup from original purchase
  order; create renewal audit order record for DID_RENEW/SUBSCRIBED notifications

Bug 8: UpdateOrderStatus - pre-delete cache before DB write (double-delete) to
  close TOCTOU window between DB update and cache invalidation

Bug 9: validateNewUserOnlyEligibilityAtActivation - add Redis distributed lock on
  user_id to serialise concurrent new-user-only order activations

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/notify/appleIAPNotifyLogic.go

@@ -3,17 +3,20 @@ package notify
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"strconv"
 	"strings"
 
 	commonLogic "github.com/perfect-panel/server/internal/logic/common"
 	iapmodel "github.com/perfect-panel/server/internal/model/iap/apple"
+	"github.com/perfect-panel/server/internal/model/order"
 	"github.com/perfect-panel/server/internal/model/subscribe"
 	"github.com/perfect-panel/server/internal/model/user"
 	"github.com/perfect-panel/server/internal/svc"
 	"github.com/perfect-panel/server/internal/types"
 	iapapple "github.com/perfect-panel/server/pkg/iap/apple"
 	"github.com/perfect-panel/server/pkg/logger"
+	"github.com/perfect-panel/server/pkg/tool"
 	"gorm.io/gorm"
 )
 
@@ -84,6 +87,7 @@ func (l *AppleIAPNotifyLogic) Handle(signedPayload string) error {
 				l.Errorw("iap notify insert transaction error", logger.Field("error", e.Error()), logger.Field("productId", txPayload.ProductId), logger.Field("originalTransactionId", txPayload.OriginalTransactionId))
 				return e
 			}
+			existing = rec
 		} else {
 			if txPayload.RevocationDate != nil {
 				// 撤销场景：更新 revocation_at
@@ -96,6 +100,32 @@ func (l *AppleIAPNotifyLogic) Handle(signedPayload string) error {
 				}
 			}
 		}
+
+		// Fix Bug 7: resolve userId when the IAP transaction record has no associated user.
+		// This can happen if the first notification for a subscription arrived before the
+		// in-app purchase flow created the order (race) or the order was made in a previous
+		// build that did not write user_id to the IAP transaction table.
+		if existing != nil && existing.UserId == 0 {
+			var origOrder order.Order
+			if lookupErr := db.Model(&order.Order{}).
+				Where("trade_no = ? AND method = ?", txPayload.OriginalTransactionId, "apple_iap").
+				Order("id ASC").
+				First(&origOrder).Error; lookupErr == nil && origOrder.UserId > 0 {
+				existing.UserId = origOrder.UserId
+				_ = db.Model(&iapmodel.Transaction{}).
+					Where("id = ?", existing.Id).
+					Update("user_id", origOrder.UserId).Error
+				l.Infow("iap notify resolved zero userId from original purchase order",
+					logger.Field("userId", origOrder.UserId),
+					logger.Field("originalTransactionId", txPayload.OriginalTransactionId),
+				)
+			} else {
+				l.Errorw("CRITICAL: iap notify UserId=0 and cannot resolve from order, notification dropped",
+					logger.Field("originalTransactionId", txPayload.OriginalTransactionId))
+				return fmt.Errorf("iap notify: UserId=0 and cannot resolve from order for original_transaction_id=%s", txPayload.OriginalTransactionId)
+			}
+		}
+
 		var days int64
 		{
 			pid := strings.ToLower(txPayload.ProductId)
@@ -169,7 +199,12 @@ func (l *AppleIAPNotifyLogic) Handle(signedPayload string) error {
 			}
 		}
 		if days == 0 {
-			l.Errorw("iap notify product mapping missing", logger.Field("productId", txPayload.ProductId))
+			// Both string-parse and DB fallback failed to map the product to days.
+			// Return an error so Apple retries the notification; silently ignoring
+			// this would cause the subscriber's renewal to be lost.
+			l.Errorw("CRITICAL: iap notify product mapping missing, returning error to trigger retry",
+				logger.Field("productId", txPayload.ProductId))
+			return fmt.Errorf("iap product id %s could not be mapped to subscription days", txPayload.ProductId)
 		}
 		token := "iap:" + txPayload.OriginalTransactionId
 		sub, e := l.svcCtx.UserModel.FindOneSubscribeByToken(l.ctx, token)
@@ -216,6 +251,11 @@ func (l *AppleIAPNotifyLogic) Handle(signedPayload string) error {
 							logger.Field("product_id", txPayload.ProductId),
 						)...,
 					)
+					// Create audit order record for renewal notifications (Bug 7)
+					if err := l.createIAPRenewalAuditOrder(db, ntype, txPayload.TransactionId, candidate.UserId, candidate.SubscribeId, candidate.Token); err != nil {
+						l.Errorw("iap notify fallback create renewal order error", logger.Field("error", err.Error()))
+						// Non-fatal: subscription already updated; order creation failure is logged only
+					}
 					break
 				}
 			}
@@ -248,7 +288,52 @@ func (l *AppleIAPNotifyLogic) Handle(signedPayload string) error {
 					logger.Field("product_id", txPayload.ProductId),
 				)...,
 			)
+			// Create audit order record for renewal notifications (Bug 7)
+			if err := l.createIAPRenewalAuditOrder(db, ntype, txPayload.TransactionId, sub.UserId, sub.SubscribeId, sub.Token); err != nil {
+				l.Errorw("iap notify create renewal order error", logger.Field("error", err.Error()))
+				// Non-fatal: subscription already updated; order creation failure is logged only
+			}
 		}
 		return nil
 	})
 }
+
+// createIAPRenewalAuditOrder creates a finished renewal order record for DID_RENEW and SUBSCRIBED
+// Apple SSNS notifications so that the order table has a complete financial audit trail.
+// The operation is idempotent: if an order with the same trade_no already exists it is skipped.
+func (l *AppleIAPNotifyLogic) createIAPRenewalAuditOrder(db *gorm.DB, ntype, transactionId string, userId, subscribeId int64, subscribeToken string) error {
+	if ntype != "DID_RENEW" && ntype != "SUBSCRIBED" {
+		return nil
+	}
+	// Idempotency check
+	var count int64
+	if err := db.Model(&order.Order{}).
+		Where("trade_no = ? AND method = ?", transactionId, "apple_iap").
+		Count(&count).Error; err != nil {
+		return fmt.Errorf("check existing iap renewal order: %w", err)
+	}
+	if count > 0 {
+		return nil
+	}
+	rec := &order.Order{
+		UserId:         userId,
+		OrderNo:        tool.GenerateTradeNo(),
+		Type:           2, // OrderTypeRenewal
+		Status:         5, // OrderStatusFinished
+		Method:         "apple_iap",
+		TradeNo:        transactionId,
+		SubscribeId:    subscribeId,
+		SubscribeToken: subscribeToken,
+		Quantity:       1,
+		IsNew:          false,
+	}
+	if err := db.Model(&order.Order{}).Create(rec).Error; err != nil {
+		return fmt.Errorf("create iap renewal audit order: %w", err)
+	}
+	l.Infow("iap notify created renewal audit order",
+		logger.Field("orderNo", rec.OrderNo),
+		logger.Field("transactionId", transactionId),
+		logger.Field("userId", userId),
+	)
+	return nil
+}

internal/model/order/model.go

@@ -110,6 +110,10 @@ func (m *customOrderModel) UpdateOrderStatus(ctx context.Context, orderNo string
 	if err != nil {
 		return err
 	}
+	keys := m.getCacheKeys(orderInfo)
+	// Pre-delete: evict cache before the DB write so concurrent reads during the update
+	// window go to DB instead of getting a stale cached status (double-delete pattern).
+	_ = m.DelCacheCtx(ctx, keys...)
 	return m.ExecCtx(ctx, func(conn *gorm.DB) error {
 		if len(tx) > 0 {
 			conn = tx[0]
@@ -123,7 +127,7 @@ func (m *customOrderModel) UpdateOrderStatus(ctx context.Context, orderNo string
 			return nil
 		}
 		return nil
-	}, m.getCacheKeys(orderInfo)...)
+	}, keys...)
 }
 
 // FindOneDetailsByOrderNo Find order details by order number