feat(transaction): enhance IStoreTransaction with price and currency …

…fields

Sources/Flare/Classes/Models/Internal/Protocols/IStoreTransaction.swift

@@ -19,7 +19,11 @@ protocol IStoreTransaction {
     var hasKnownTransactionIdentifier: Bool { get }
     /// The quantity of the product involved in the transaction.
     var quantity: Int { get }
-
+    /// The price of the in-app purchase that the system records in the transaction.
+    var price: Decimal? { get }
+    /// The currency of the price of the product.
+    var currency: String? { get }
+
     /// The raw JWS representation of the transaction.
     ///
     /// - Note: This is only available for StoreKit 2 transactions.
@@ -30,3 +34,14 @@ protocol IStoreTransaction {
     /// - Note: This is only available for StoreKit 2 transactions.
     var environment: StoreEnvironment? { get }
 }
+
+/// Default implementation of the currency property for backward compatibility.
+extension IStoreTransaction {
+    var currency: String? {
+        if #available(iOS 16.0, macOS 13.0, watchOS 9.0, tvOS 16.0, *) {
+            return Locale.current.currency?.identifier
+        } else {
+            return Locale.current.currencyCode
+        }
+    }
+}

Sources/Flare/Classes/Models/Internal/SK1StoreTransaction.swift

@@ -62,4 +62,10 @@ extension SK1StoreTransaction: IStoreTransaction {
     var environment: StoreEnvironment? {
         nil
     }
+    var price: Decimal? {
+        nil
+    }
+    var currency: String? {
+        nil
+    }
 }

Sources/Flare/Classes/Models/Internal/SK2StoreTransaction.swift

@@ -66,4 +66,16 @@ extension SK2StoreTransaction: IStoreTransaction {
     var environment: StoreEnvironment? {
         StoreEnvironment(transaction: transaction)
     }
+
+    var price: Decimal? {
+        transaction.price
+    }
+
+    var currency: String? {
+        if #available(iOS 16.0, macOS 13.0, watchOS 9.0, tvOS 16.0, *) {
+            transaction.currency?.identifier
+        } else {
+            transaction.currencyCode
+        }
+    }
 }

Sources/Flare/Classes/Models/StoreTransaction.swift

@@ -80,6 +80,13 @@ extension StoreTransaction: IStoreTransaction {
     var environment: StoreEnvironment? {
         storeTransaction.environment
     }
+    var price: Decimal? {
+        storeTransaction.price
+    }
+
+    var currency: String? {
+        storeTransaction.currency
+    }
 }
 
 // MARK: Equatable

Tests/FlareTests/UnitTests/TestHelpers/Mocks/StoreTransactionMock.swift

@@ -86,4 +86,24 @@ final class StoreTransactionMock: IStoreTransaction {
         invokedEnvironmentGetterCount += 1
         return stubbedEnvironment
     }
+
+    var invokedPriceGetter = false
+    var invokedPriceGetterCount = 0
+    var stubbedPrice: Decimal!
+
+    var price: Decimal? {
+        invokedPriceGetter = true
+        invokedPriceGetterCount += 1
+        return stubbedPrice
+    }
+
+    var invokedCurrencyGetter = false
+    var invokedCurrencyGetterCount = 0
+    var stubbedCurrency: String!
+
+    var currency: String {
+        invokedCurrencyGetter = true
+        invokedCurrencyGetterCount += 1
+        return stubbedCurrency
+    }
 }

Tests/FlareTests/UnitTests/TestHelpers/Stubs/StoreTransactionStub.swift

@@ -54,4 +54,16 @@ final class StoreTransactionStub: IStoreTransaction {
     var environment: StoreEnvironment? {
         stubbedEnvironment
     }
+
+    var stubbedPrice: Decimal!
+
+    var price: Decimal? {
+        stubbedPrice
+    }
+
+    var stubbedCurrency: String!
+
+    var currency: String? {
+        stubbedCurrency
+    }
 }