我最近转换到StoreKit 2来处理我的应用程序中的活动订阅。但有些方面我不太确定。关于revocationDate和到期日期的文档我不清楚。
1.如果用户在7天试用中取消了他的 * 自动续订 *，撤销日期是否为非零？

1. Transaction.currentEntitlements是否仅包含当前活动的产品？我假设我真的不需要检查expirationDate是否过期，如果是这样的话。
   1.是否建议在MainThread中执行此代码？
   以下是完整的方法：

@MainActor
    func syncActiveAppleProduct() async {
        LoggerManager.shared.warning("[Fetch Current Entitlements]")
        
        var activeSubscriptions: [Product] = []

        for await result in Transaction.currentEntitlements {
            do {

                let transaction = try checkVerified(result)
                
                guard let subscription: Product = subscriptions.first(where: { $0.id == transaction.productID }) else {
                    continue
                }
                
                switch transaction.productType {
                case .autoRenewable:
                    guard transaction.revocationDate == nil else { continue }

                    if let expirationDate = transaction.expirationDate {
                        KeychainHelper.Subscription.setExpiryOrCancelledDate(expirationDate)
                    }
                    activeSubscriptions.append(subscription)
                    
                case .consumable, .nonConsumable, .nonRenewable:
                    guard let expirationDate = getNonRenewingExpirationDate(forProductId: transaction.productID, purchaseDate: transaction.purchaseDate) else { continue }
                    if Date() < expirationDate {
                        KeychainHelper.Subscription.setExpiryOrCancelledDate(expirationDate)
                        activeSubscriptions.append(subscription)
                    }
                default:
                    continue
                }
                
            } catch let error {
                LoggerManager.shared.error(error: error, message: "Failed update active customer product.")
            }
        }

        self.activeSubscriptions = activeSubscriptions
    }