Merge pull request #164 from bizz84/feature/verify-subscription-check-cancellation_date

Filter out all receipts with "cancellation_date" != nil (#163)

SwiftyStoreKit/InAppReceipt.swift

@@ -105,14 +105,15 @@ internal class InAppReceipt {
         // The values of the latest_receipt and latest_receipt_info keys are useful when checking whether an auto-renewable subscription is currently active. By providing any transaction receipt for the subscription and checking these values, you can get information about the currently-active subscription period. If the receipt being validated is for the latest renewal, the value for latest_receipt is the same as receipt-data (in the request) and the value for latest_receipt_info is the same as receipt.
         let (receipts, duration) = getReceiptsAndDuration(for: type, inReceipt: receipt)
         let receiptsInfo = filterReceiptsInfo(receipts: receipts, withProductId: productId)
-        if receiptsInfo.count == 0 {
+        let nonCancelledReceiptsInfo = receiptsInfo.filter { receipt in receipt["cancellation_date"] == nil }
+        if nonCancelledReceiptsInfo.count == 0 {
             return .notPurchased
         }
 
         let receiptDate = getReceiptRequestDate(inReceipt: receipt) ?? date
 
         // Return the expires dates sorted desc
-        let expiryDateValues = receiptsInfo
+        let expiryDateValues = nonCancelledReceiptsInfo
             .flatMap { (receipt) -> String? in
                 let key: String = duration != nil ? "original_purchase_date_ms" : "expires_date_ms"
                 return receipt[key] as? String