Add support for MacOS to in_app_purchase plugin.

packages/in_app_purchase/lib/src/in_app_purchase/in_app_purchase_connection.dart

@@ -50,7 +50,7 @@ abstract class InAppPurchaseConnection {
     if (Platform.isAndroid) {
       _purchaseUpdatedStream =
           GooglePlayConnection.instance.purchaseUpdatedStream;
-    } else if (Platform.isIOS) {
+    } else if (Platform.isIOS | Platform.isMacOS) {
       _purchaseUpdatedStream =
           AppStoreConnection.instance.purchaseUpdatedStream;
     } else {
@@ -258,7 +258,7 @@ abstract class InAppPurchaseConnection {
 
     if (Platform.isAndroid) {
       _instance = GooglePlayConnection.instance;
-    } else if (Platform.isIOS) {
+    } else if (Platform.isIOS | Platform.isMacOS) {
       _instance = AppStoreConnection.instance;
     } else {
       throw UnsupportedError(

packages/in_app_purchase/macos/Classes/FIAObjectTranslator.h

@@ -0,0 +1,35 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+#import <StoreKit/StoreKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FIAObjectTranslator : NSObject
+
++ (NSDictionary *)getMapFromSKProduct:(SKProduct *)product;
+
++ (NSDictionary *)getMapFromSKProductSubscriptionPeriod:(SKProductSubscriptionPeriod *)period
+    API_AVAILABLE(ios(11.2));
+
++ (NSDictionary *)getMapFromSKProductDiscount:(SKProductDiscount *)discount
+    API_AVAILABLE(ios(11.2));
+
++ (NSDictionary *)getMapFromSKProductsResponse:(SKProductsResponse *)productResponse;
+
++ (NSDictionary *)getMapFromSKPayment:(SKPayment *)payment;
+
++ (NSDictionary *)getMapFromNSLocale:(NSLocale *)locale;
+
++ (SKMutablePayment *)getSKMutablePaymentFromMap:(NSDictionary *)map;
+
++ (NSDictionary *)getMapFromSKPaymentTransaction:(SKPaymentTransaction *)transaction;
+
++ (NSDictionary *)getMapFromNSError:(NSError *)error;
+
+@end
+;
+
+NS_ASSUME_NONNULL_END

packages/in_app_purchase/macos/Classes/FIAObjectTranslator.m

@@ -0,0 +1,172 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "FIAObjectTranslator.h"
+
+#pragma mark - SKProduct Coders
+
+@implementation FIAObjectTranslator
+
++ (NSDictionary *)getMapFromSKProduct:(SKProduct *)product {
+  if (!product) {
+    return nil;
+  }
+  NSMutableDictionary *map = [[NSMutableDictionary alloc] initWithDictionary:@{
+    @"localizedDescription" : product.localizedDescription ?: [NSNull null],
+    @"localizedTitle" : product.localizedTitle ?: [NSNull null],
+    @"productIdentifier" : product.productIdentifier ?: [NSNull null],
+    @"price" : product.price.description ?: [NSNull null]
+
+  }];
+  // TODO(cyanglaz): NSLocale is a complex object, want to see the actual need of getting this
+  // expanded to a map. Matching android to only get the currencySymbol for now.
+  // https://github.com/flutter/flutter/issues/26610
+  [map setObject:[FIAObjectTranslator getMapFromNSLocale:product.priceLocale] ?: [NSNull null]
+          forKey:@"priceLocale"];
+  if (@available(iOS 11.2, *)) {
+    [map setObject:[FIAObjectTranslator
+                       getMapFromSKProductSubscriptionPeriod:product.subscriptionPeriod]
+                       ?: [NSNull null]
+            forKey:@"subscriptionPeriod"];
+  }
+  if (@available(iOS 11.2, *)) {
+    [map setObject:[FIAObjectTranslator getMapFromSKProductDiscount:product.introductoryPrice]
+                       ?: [NSNull null]
+            forKey:@"introductoryPrice"];
+  }
+  if (@available(iOS 12.0, *)) {
+    [map setObject:product.subscriptionGroupIdentifier ?: [NSNull null]
+            forKey:@"subscriptionGroupIdentifier"];
+  }
+  return map;
+}
+
++ (NSDictionary *)getMapFromSKProductSubscriptionPeriod:(SKProductSubscriptionPeriod *)period {
+  if (!period) {
+    return nil;
+  }
+  return @{@"numberOfUnits" : @(period.numberOfUnits), @"unit" : @(period.unit)};
+}
+
++ (NSDictionary *)getMapFromSKProductDiscount:(SKProductDiscount *)discount {
+  if (!discount) {
+    return nil;
+  }
+  NSMutableDictionary *map = [[NSMutableDictionary alloc] initWithDictionary:@{
+    @"price" : discount.price.description ?: [NSNull null],
+    @"numberOfPeriods" : @(discount.numberOfPeriods),
+    @"subscriptionPeriod" :
+            [FIAObjectTranslator getMapFromSKProductSubscriptionPeriod:discount.subscriptionPeriod]
+        ?: [NSNull null],
+    @"paymentMode" : @(discount.paymentMode)
+  }];
+
+  // TODO(cyanglaz): NSLocale is a complex object, want to see the actual need of getting this
+  // expanded to a map. Matching android to only get the currencySymbol for now.
+  // https://github.com/flutter/flutter/issues/26610
+  [map setObject:[FIAObjectTranslator getMapFromNSLocale:discount.priceLocale] ?: [NSNull null]
+          forKey:@"priceLocale"];
+  return map;
+}
+
++ (NSDictionary *)getMapFromSKProductsResponse:(SKProductsResponse *)productResponse {
+  if (!productResponse) {
+    return nil;
+  }
+  NSMutableArray *productsMapArray = [NSMutableArray new];
+  for (SKProduct *product in productResponse.products) {
+    [productsMapArray addObject:[FIAObjectTranslator getMapFromSKProduct:product]];
+  }
+  return @{
+    @"products" : productsMapArray,
+    @"invalidProductIdentifiers" : productResponse.invalidProductIdentifiers ?: @[]
+  };
+}
+
++ (NSDictionary *)getMapFromSKPayment:(SKPayment *)payment {
+  if (!payment) {
+    return nil;
+  }
+  NSMutableDictionary *map = [[NSMutableDictionary alloc] initWithDictionary:@{
+    @"productIdentifier" : payment.productIdentifier ?: [NSNull null],
+    @"requestData" : payment.requestData ? [[NSString alloc] initWithData:payment.requestData
+                                                                 encoding:NSUTF8StringEncoding]
+                                         : [NSNull null],
+    @"quantity" : @(payment.quantity),
+    @"applicationUsername" : payment.applicationUsername ?: [NSNull null]
+  }];
+  if (@available(iOS 8.3, *)) {
+    [map setObject:@(payment.simulatesAskToBuyInSandbox) forKey:@"simulatesAskToBuyInSandbox"];
+  }
+  return map;
+}
+
++ (NSDictionary *)getMapFromNSLocale:(NSLocale *)locale {
+  if (!locale) {
+    return nil;
+  }
+  NSMutableDictionary *map = [[NSMutableDictionary alloc] init];
+  [map setObject:[locale objectForKey:NSLocaleCurrencySymbol] ?: [NSNull null]
+          forKey:@"currencySymbol"];
+  [map setObject:[locale objectForKey:NSLocaleCurrencyCode] ?: [NSNull null]
+          forKey:@"currencyCode"];
+  return map;
+}
+
++ (SKMutablePayment *)getSKMutablePaymentFromMap:(NSDictionary *)map {
+  if (!map) {
+    return nil;
+  }
+  SKMutablePayment *payment = [[SKMutablePayment alloc] init];
+  payment.productIdentifier = map[@"productIdentifier"];
+  NSString *utf8String = map[@"requestData"];
+  payment.requestData = [utf8String dataUsingEncoding:NSUTF8StringEncoding];
+  payment.quantity = [map[@"quantity"] integerValue];
+  payment.applicationUsername = map[@"applicationUsername"];
+  if (@available(iOS 8.3, *)) {
+    payment.simulatesAskToBuyInSandbox = [map[@"simulatesAskToBuyInSandbox"] boolValue];
+  }
+  return payment;
+}
+
++ (NSDictionary *)getMapFromSKPaymentTransaction:(SKPaymentTransaction *)transaction {
+  if (!transaction) {
+    return nil;
+  }
+  NSMutableDictionary *map = [[NSMutableDictionary alloc] initWithDictionary:@{
+    @"error" : [FIAObjectTranslator getMapFromNSError:transaction.error] ?: [NSNull null],
+    @"payment" : transaction.payment ? [FIAObjectTranslator getMapFromSKPayment:transaction.payment]
+                                     : [NSNull null],
+    @"originalTransaction" : transaction.originalTransaction
+        ? [FIAObjectTranslator getMapFromSKPaymentTransaction:transaction.originalTransaction]
+        : [NSNull null],
+    @"transactionTimeStamp" : transaction.transactionDate
+        ? @(transaction.transactionDate.timeIntervalSince1970)
+        : [NSNull null],
+    @"transactionIdentifier" : transaction.transactionIdentifier ?: [NSNull null],
+    @"transactionState" : @(transaction.transactionState)
+  }];
+
+  return map;
+}
+
++ (NSDictionary *)getMapFromNSError:(NSError *)error {
+  if (!error) {
+    return nil;
+  }
+  NSMutableDictionary *userInfo = [NSMutableDictionary new];
+  for (NSErrorUserInfoKey key in error.userInfo) {
+    id value = error.userInfo[key];
+    if ([value isKindOfClass:[NSError class]]) {
+      userInfo[key] = [FIAObjectTranslator getMapFromNSError:value];
+    } else if ([value isKindOfClass:[NSURL class]]) {
+      userInfo[key] = [value absoluteString];
+    } else {
+      userInfo[key] = value;
+    }
+  }
+  return @{@"code" : @(error.code), @"domain" : error.domain ?: @"", @"userInfo" : userInfo};
+}
+
+@end

packages/in_app_purchase/macos/Classes/FIAPReceiptManager.h

@@ -0,0 +1,17 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class FlutterError;
+
+@interface FIAPReceiptManager : NSObject
+
+- (nullable NSString *)retrieveReceiptWithError:(FlutterError *_Nullable *_Nullable)error;
+
+@end
+
+NS_ASSUME_NONNULL_END

packages/in_app_purchase/macos/Classes/FIAPReceiptManager.m

@@ -0,0 +1,33 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+//
+//  FIAPReceiptManager.m
+//  in_app_purchase
+//
+//  Created by Chris Yang on 3/2/19.
+//
+
+#import "FIAPReceiptManager.h"
+#import <FlutterMacOS/FlutterMacOS.h>
+
+@implementation FIAPReceiptManager
+
+- (NSString *)retrieveReceiptWithError:(FlutterError **)error {
+  NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];
+  NSData *receipt = [self getReceiptData:receiptURL];
+  if (!receipt) {
+    *error = [FlutterError errorWithCode:@"storekit_no_receipt"
+                                 message:@"Cannot find receipt for the current main bundle."
+                                 details:nil];
+    return nil;
+  }
+  return [receipt base64EncodedStringWithOptions:kNilOptions];
+}
+
+- (NSData *)getReceiptData:(NSURL *)url {
+  return [NSData dataWithContentsOfURL:url];
+}
+
+@end

packages/in_app_purchase/macos/Classes/FIAPRequestHandler.h

@@ -0,0 +1,20 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+#import <StoreKit/StoreKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef void (^ProductRequestCompletion)(SKProductsResponse *_Nullable response,
+                                         NSError *_Nullable errror);
+
+@interface FIAPRequestHandler : NSObject
+
+- (instancetype)initWithRequest:(SKRequest *)request;
+- (void)startProductRequestWithCompletionHandler:(ProductRequestCompletion)completion;
+
+@end
+
+NS_ASSUME_NONNULL_END

packages/in_app_purchase/macos/Classes/FIAPRequestHandler.m

@@ -0,0 +1,55 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "FIAPRequestHandler.h"
+#import <StoreKit/StoreKit.h>
+
+#pragma mark - Main Handler
+
+@interface FIAPRequestHandler () <SKProductsRequestDelegate>
+
+@property(copy, nonatomic) ProductRequestCompletion completion;
+@property(strong, nonatomic) SKRequest *request;
+
+@end
+
+@implementation FIAPRequestHandler
+
+- (instancetype)initWithRequest:(SKRequest *)request {
+  self = [super init];
+  if (self) {
+    self.request = request;
+    request.delegate = self;
+  }
+  return self;
+}
+
+- (void)startProductRequestWithCompletionHandler:(ProductRequestCompletion)completion {
+  self.completion = completion;
+  [self.request start];
+}
+
+- (void)productsRequest:(SKProductsRequest *)request
+     didReceiveResponse:(SKProductsResponse *)response {
+  if (self.completion) {
+    self.completion(response, nil);
+    // set the completion to nil here so self.completion won't be triggered again in
+    // requestDidFinish for SKProductRequest.
+    self.completion = nil;
+  }
+}
+
+- (void)requestDidFinish:(SKRequest *)request {
+  if (self.completion) {
+    self.completion(nil, nil);
+  }
+}
+
+- (void)request:(SKRequest *)request didFailWithError:(NSError *)error {
+  if (self.completion) {
+    self.completion(nil, error);
+  }
+}
+
+@end