Implement support of handling dropped success purchase.

This is similar feature from react-native-iap(dooboolab-community/react-native-iap#307). Similar issue in current repo #54.
dooboolab-community · Jan 28, 2019 · bd13457 · bd13457
1 parent 192277a
commit bd13457
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Showing 3 changed files with 64 additions and 13 deletions.
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -9,7 +9,6 @@
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@@ -42,7 +41,6 @@
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@@ -85,7 +83,6 @@
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@@ -214,7 +211,6 @@
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-				2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */,
 				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
 			);
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diff --git a/ios/Classes/FlutterInappPurchasePlugin.m b/ios/Classes/FlutterInappPurchasePlugin.m
@@ -328,6 +328,9 @@ -(void)purchaseProcess:(SKPaymentTransaction *)transaction {
         [requestedPayments removeObjectForKey:transaction.payment];
     }
     [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
+
+    // additionally send event
+    [self.channel invokeMethod:@"iap-purchase-event" arguments: purchase];
 }
 
 - (NSDictionary *)getPurchaseData:(SKPaymentTransaction *)transaction {

diff --git a/lib/flutter_inapp_purchase.dart b/lib/flutter_inapp_purchase.dart
@@ -17,6 +17,10 @@ class FlutterInappPurchase {
     'subs',
   ];
 
+  static StreamController<PurchasedItem> _purchaseController;
+  static StreamSubscription _purchaseSub;
+  static Stream<PurchasedItem> get onAdditionalSuccessPurchaseIOS => _purchaseController.stream;
+
   /// Defining the [MethodChannel] for Flutter_Inapp_Purchase
   static const MethodChannel _channel = const MethodChannel('flutter_inapp');
 
@@ -213,15 +217,27 @@ class FlutterInappPurchase {
 
       return item;
     } else if (Platform.isIOS) {
-      dynamic result = await _channel.invokeMethod<dynamic>(
-          'buyProductWithFinishTransaction', <String, dynamic>{
-        'sku': sku,
-      });
-      result = json.encode(result);
-
-      Map<String, dynamic> param = json.decode(result.toString());
-      PurchasedItem item = PurchasedItem.fromJSON(param);
-      return item;
+      try {
+        dynamic result = await _channel.invokeMethod<dynamic>(
+            'buyProductWithFinishTransaction', <String, dynamic>{
+          'sku': sku,
+        });
+        result = json.encode(result);
+
+        Map<String, dynamic> param = json.decode(result.toString());
+        PurchasedItem item = PurchasedItem.fromJSON(param);
+        return item;
+      } catch (err) {
+        print('Caused err. Set additionalSuccessPurchaseListenerIOS.');
+        print(err);
+        await _addAdditionalSuccessPurchaseListenerIOS();
+        _purchaseSub = onAdditionalSuccessPurchaseIOS.listen((data) {
+          _removePurchaseListener();
+          Map<String, dynamic> param = json.decode(data.toString());
+          PurchasedItem item = PurchasedItem.fromJSON(param);
+          return item;
+        });
+      }
     }
     throw PlatformException(
         code: Platform.operatingSystem, message: "platform not supported");
@@ -461,4 +477,40 @@ class FlutterInappPurchase {
       },
     );
   }
+
+  /// Add additional success purchase listener to iOS when purchase failed
+  ///
+  /// In iOS, purchase could be failed randomly. See the reference: https://github.com/dooboolab/react-native-iap/issues/307
+  /// To make your purchase flow confidential, use below method. Checkout how this is used in `example` project.
+  static Future<void> _addAdditionalSuccessPurchaseListenerIOS() async {
+    if (Platform.isIOS) {
+      if (_purchaseController == null) {
+        _purchaseController = new StreamController.broadcast();
+      }
+      _channel.setMethodCallHandler((MethodCall call) {
+        switch (call.method) {
+          case "iap-purchase-event":
+            Map<String, dynamic> result = jsonDecode(call.arguments);
+            _purchaseController.add(new PurchasedItem.fromJSON(result));
+            _removePurchaseListener();
+            break;
+          default:
+            throw new ArgumentError('Unknown method ${call.method}');
+        }
+      });
+    }
+  }
+
+  static Future<void> _removePurchaseListener() async {
+    if (_purchaseSub != null) {
+      _purchaseSub.cancel();
+      _purchaseSub = null;
+    }
+    if (_purchaseController != null) {
+      _purchaseController
+        ..add(null)
+        ..close();
+      _purchaseController = null;
+    }
+  }
 }