Parsing SKProductDiscount inside SKProduct (chirag04#186)

Author: whtlnv

InAppUtils/InAppUtils.m

@@ -296,11 +296,12 @@ - (void)productsRequest:(SKProductsRequest *)request
     NSString *key = RCTKeyForInstance(request);
     NSDictionary *promiseBlock = _promiseBlocks[key];
     if (promiseBlock) {
-            RCTPromiseResolveBlock resolve = promiseBlock[@"resolve"];
-            if (resolve) {
+        RCTPromiseResolveBlock resolve = promiseBlock[@"resolve"];
+        if (resolve) {
             products = [NSMutableArray arrayWithArray:response.products];
             NSMutableArray *productsArrayForJS = [NSMutableArray array];
             for(SKProduct *item in response.products) {
+                NSDictionary *introductoryPrice = [InAppUtils parseIntroductoryPrice: item];
                 NSDictionary *product = @{
                     @"identifier": item.productIdentifier,
                     @"price": item.price,
@@ -311,6 +312,7 @@ - (void)productsRequest:(SKProductsRequest *)request
                     @"downloadable": item.isDownloadable ? @"true" : @"false" ,
                     @"description": item.localizedDescription ? item.localizedDescription : @"",
                     @"title": item.localizedTitle ? item.localizedTitle : @"",
+                    @"introductoryPrice": (introductoryPrice == nil) ? [NSNull null] : introductoryPrice,
                 };
                 [productsArrayForJS addObject:product];
             }
@@ -383,6 +385,66 @@ - (void)dealloc
     [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
 }
 
+#pragma mark Static
+
++ (NSDictionary *)parseIntroductoryPrice: (SKProduct *)product {
+    if(@available(iOS 11.2, *)) {
+        if (product != nil && product.introductoryPrice != nil) {
+            // paymentMode: Returning as string for ease of use and code resilience
+            NSString *paymentMode;
+            switch (product.introductoryPrice.paymentMode) {
+                case SKProductDiscountPaymentModeFreeTrial:
+                    paymentMode = @"freeTrial";
+                    break;
+                case SKProductDiscountPaymentModePayAsYouGo:
+                    paymentMode = @"payAsYouGo";
+                    break;
+                case SKProductDiscountPaymentModePayUpFront:
+                    paymentMode = @"payUpFront";
+                    break;
+                default:
+                    paymentMode = @"unavailable";
+                    break;
+            }
+
+            // subscriptionPeriod: Returning as Dictionary { unit: NSString, numberOfUnits: NSNumber }
+            NSString *subscriptionPeriodUnit;
+            switch (product.introductoryPrice.subscriptionPeriod.unit) {
+                case SKProductPeriodUnitDay:
+                    subscriptionPeriodUnit = @"day";
+                    break;
+                case SKProductPeriodUnitWeek:
+                    subscriptionPeriodUnit = @"week";
+                    break;
+                case SKProductPeriodUnitMonth:
+                    subscriptionPeriodUnit = @"month";
+                    break;
+                case SKProductPeriodUnitYear:
+                    subscriptionPeriodUnit = @"year";
+                    break;
+                default:
+                    subscriptionPeriodUnit = @"unavailable";
+                    break;
+            }
+
+            NSDictionary *subscriptionPeriod = @{
+                                                 @"unit": subscriptionPeriodUnit,
+                                                 @"numberOfUnits": [[NSNumber alloc] initWithLong:product.introductoryPrice.subscriptionPeriod.numberOfUnits],
+                                                 };
+
+            NSDictionary *introductoryPrice = @{
+                                                @"price": product.introductoryPrice.price,
+                                                @"numberOfPeriods": [[NSNumber alloc] initWithLong:product.introductoryPrice.numberOfPeriods],
+                                                @"paymentMode": paymentMode,
+                                                @"subscriptionPeriod": subscriptionPeriod,
+                                                };
+            return introductoryPrice;
+        }
+    }
+
+    return nil;
+}
+
 #pragma mark Private
 
 static NSString *RCTKeyForInstance(id instance)