Added InAppBilling.VerifyPreviousPurchaseAsync()

src/Plugin.InAppBilling.Abstractions/BaseInAppBilling.cs

@@ -1,5 +1,6 @@
-using System;
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 
 namespace Plugin.InAppBilling.Abstractions
@@ -35,24 +36,48 @@ public abstract class BaseInAppBilling : IInAppBilling, IDisposable
         public abstract Task<IEnumerable<InAppBillingProduct>> GetProductInfoAsync(ItemType itemType, params string[] productIds);
 
 
-        /// <summary>
-        /// Get all current purhcase for a specifiy product type.
-        /// </summary>
-        /// <param name="itemType">Type of product</param>
+		/// <summary>
+		/// Verifies a specific product type and product id. Use e.g. when product is already purchased but verification failed and needs to be called again.
+		/// </summary>
+		/// <param name="itemType">Type of product</param>
+		/// <param name="verifyPurchase">Interface to verify purchase</param>
+		/// <param name="productId">Id of product</param>
+		/// <returns>The current purchases</returns>
+		public async Task<bool> VerifyPreviousPurchaseAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string productId)
+		{
+			return (await GetPurchasesAsync(itemType, verifyPurchase, productId))?.Any(p => productId.Equals(p?.ProductId)) ?? false;
+		}
+
+		/// <summary>
+		/// Get all current purchases for a specific product type. If verification fails for some purchase, it's not contained in the result.
+		/// </summary>
+		/// <param name="itemType">Type of product</param>
+		/// <param name="verifyPurchase">Interface to verify purchase</param>
+		/// <param name="verifyOnlyProductId">If you want to verify a specific purchase, provide its id. Other purchases will be returned without verification.</param>
+		/// <returns>The current purchases</returns>
+		protected abstract Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string verifyOnlyProductId);
+
+		/// <summary>
+		/// Get all current purchases for a specific product type. If you use verification and it fails for some purchase, it's not contained in the result.
+		/// </summary>
+		/// <param name="itemType">Type of product</param>
         /// <param name="verifyPurchase">Verify purchase implementation</param>
-        /// <returns>The current purchases</returns>
-        public abstract Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null);
+		/// <returns>The current purchases</returns>
+		public async Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null)
+		{
+			return await GetPurchasesAsync(itemType, verifyPurchase, null);
+		}
 
-        /// <summary>
-        /// Purchase a specific product or subscription
-        /// </summary>
-        /// <param name="productId">Sku or ID of product</param>
-        /// <param name="itemType">Type of product being requested</param>
-        /// <param name="payload">Developer specific payload</param>
-        /// <param name="verifyPurchase">Verify Purchase implementation</param>
-        /// <returns>Purchase details</returns>
-        /// <exception cref="InAppBillingPurchaseException">If an error occures during processing</exception>
-        public abstract Task<InAppBillingPurchase> PurchaseAsync(string productId, ItemType itemType, string payload, IInAppBillingVerifyPurchase verifyPurchase = null);
+		/// <summary>
+		/// Purchase a specific product or subscription
+		/// </summary>
+		/// <param name="productId">Sku or ID of product</param>
+		/// <param name="itemType">Type of product being requested</param>
+		/// <param name="payload">Developer specific payload</param>
+		/// <param name="verifyPurchase">Verify Purchase implementation</param>
+		/// <returns>Purchase details</returns>
+		/// <exception cref="InAppBillingPurchaseException">If an error occures during processing</exception>
+		public abstract Task<InAppBillingPurchase> PurchaseAsync(string productId, ItemType itemType, string payload, IInAppBillingVerifyPurchase verifyPurchase = null);
 
         /// <summary>
         /// Consume a purchase with a purchase token.

src/Plugin.InAppBilling.Abstractions/IInAppBilling.cs

@@ -1,4 +1,4 @@
-
+
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
@@ -36,14 +36,22 @@ public interface IInAppBilling : IDisposable
         /// <returns>List of products</returns>
         Task<IEnumerable<InAppBillingProduct>> GetProductInfoAsync(ItemType itemType, params string[] productIds);
 
-
-        /// <summary>
-        /// Get all current purhcase for a specifiy product type.
-        /// </summary>
-        /// <param name="itemType">Type of product</param>
+		/// <summary>
+		/// Verifies a specific product type and product id. Use e.g. when product is already purchased but verification failed and needs to be called again.
+		/// </summary>
+		/// <param name="itemType">Type of product</param>
+		/// <param name="verifyPurchase">Interface to verify purchase</param>
+		/// <param name="productId">Id of product</param>
+		/// <returns>The current purchases</returns>
+		Task<bool> VerifyPreviousPurchaseAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string productId);
+
+		/// <summary>
+		/// Get all current purchases for a specific product type. If you use verification and it fails for some purchase, it's not contained in the result.
+		/// </summary>
+		/// <param name="itemType">Type of product</param>
         /// <param name="verifyPurchase">Verify purchase implementation</param>
-        /// <returns>The current purchases</returns>
-        Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null);
+		/// <returns>The current purchases</returns>
+		Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null);
 
         /// <summary>
         /// Purchase a specific product or subscription

src/Plugin.InAppBilling.Android/InAppBillingImplementation.cs

@@ -143,13 +143,7 @@ Task<IEnumerable<Product>> GetProductInfoAsync(string[] productIds, string itemT
             return getSkuDetailsTask;
         }
 
-        /// <summary>
-        /// Get all current purhcase for a specifiy product type.
-        /// </summary>
-        /// <param name="itemType">Type of product</param>
-        /// <param name="verifyPurchase">Interface to verify purchase</param>
-        /// <returns>The current purchases</returns>
-        public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null)
+		protected async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string verifyOnlyProductId)
         {
             if (serviceConnection?.Service == null)
             {
@@ -160,10 +154,10 @@ public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(
             switch (itemType)
             {
                 case ItemType.InAppPurchase:
-                    purchases = await GetPurchasesAsync(ITEM_TYPE_INAPP, verifyPurchase);
+                    purchases = await GetPurchasesAsync(ITEM_TYPE_INAPP, verifyPurchase, verifyOnlyProductId);
                     break;
                 case ItemType.Subscription:
-                    purchases = await GetPurchasesAsync(ITEM_TYPE_SUBSCRIPTION, verifyPurchase);
+                    purchases = await GetPurchasesAsync(ITEM_TYPE_SUBSCRIPTION, verifyPurchase, verifyOnlyProductId);
                     break;
             }
 
@@ -188,7 +182,7 @@ public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(
 
         }
 
-        Task<List<Purchase>> GetPurchasesAsync(string itemType, IInAppBillingVerifyPurchase verifyPurchase)
+        Task<List<Purchase>> GetPurchasesAsync(string itemType, IInAppBillingVerifyPurchase verifyPurchase, string verifyOnlyProductId = null)
         {
             var getPurchasesTask = Task.Run(async () =>
             {
@@ -222,9 +216,12 @@ Task<List<Purchase>> GetPurchasesAsync(string itemType, IInAppBillingVerifyPurch
                         string sign = signatures[i];
 
                         var purchase = JsonConvert.DeserializeObject<Purchase>(data);
-						if (verifyPurchase == null || await verifyPurchase.VerifyPurchase(data, sign, purchase.ProductId, purchase.OrderId))
-                            purchases.Add(purchase);
-                    }
+
+						if (verifyPurchase == null || (verifyOnlyProductId != null && !verifyOnlyProductId.Equals(purchase.ProductId)))
+							purchases.Add(purchase);
+						else if (await verifyPurchase.VerifyPurchase(data, sign, purchase.ProductId, purchase.OrderId))
+							purchases.Add(purchase);
+					}
 
                     continuationToken = ownedItems.GetString(RESPONSE_IAP_CONTINUATION_TOKEN);
 

src/Plugin.InAppBilling.UWP/InAppBillingImplementation.cs

@@ -70,13 +70,7 @@ public async override Task<IEnumerable<InAppBillingProduct>> GetProductInfoAsync
             return products;
         }
 
-        /// <summary>
-        /// Get all current purchase for a specific product type.
-        /// </summary>
-        /// <param name="itemType">Type of product</param>
-        /// <param name="verifyPurchase">Verify purchase implementation</param>
-        /// <returns>The current purchases</returns>
-        public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null)
+        protected async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string verifyOnlyProductId)
         {
             // Get list of product receipts from store or simulator
             var xmlReceipt = await CurrentAppMock.GetAppReceiptAsync(InTestingMode);

src/Plugin.InAppBilling.iOS/InAppBillingImplementation.cs

@@ -88,14 +88,7 @@ Task<IEnumerable<SKProduct>> GetProductAsync(string[] productId)
 			return productRequestDelegate.WaitForResponse();
 		}
 
-
-		/// <summary>
-		/// Get all current purchase for a specifiy product type.
-		/// </summary>
-		/// <param name="itemType">Type of product</param>
-		/// <param name="verifyPurchase">Interface to verify purchase</param>
-		/// <returns>The current purchases</returns>
-		public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase = null)
+		protected async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(ItemType itemType, IInAppBillingVerifyPurchase verifyPurchase, string verifyOnlyProductId)
 		{
 			var purchases = await RestoreAsync();
 
@@ -111,7 +104,7 @@ public async override Task<IEnumerable<InAppBillingPurchase>> GetPurchasesAsync(
 			var validPurchases = new List<InAppBillingPurchase>();
 			foreach (var purchase in converted)
 			{
-				if (await ValidateReceipt(verifyPurchase, purchase.ProductId, purchase.Id))
+				if ((verifyOnlyProductId != null && !verifyOnlyProductId.Equals(purchase.ProductId)) || await ValidateReceipt(verifyPurchase, purchase.ProductId, purchase.Id))
 					validPurchases.Add(purchase);
 			}