[in_app_purchase]retrieve receipt

packages/in_app_purchase/example/ios/in_app_purchase_pluginTests/InAppPurchasePluginTest.m

@@ -16,7 +16,8 @@ @interface InAppPurchasePluginTest : XCTestCase
 @implementation InAppPurchasePluginTest
 
 - (void)setUp {
-  self.plugin = [[InAppPurchasePluginStub alloc] init];
+  self.plugin =
+      [[InAppPurchasePluginStub alloc] initWithReceiptManager:[FIAPReceiptManagerStub new]];
 }
 
 - (void)tearDown {
@@ -171,4 +172,35 @@ - (void)testRestoreTransactions {
   XCTAssertTrue(callbackInvoked);
 }
 
+- (void)testRetrieveReceiptData {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"receipt data retrieved"];
+  FlutterMethodCall* call = [FlutterMethodCall
+      methodCallWithMethodName:@"-[InAppPurchasePlugin retrieveReceiptData:result:]"
+                     arguments:nil];
+  __block NSDictionary* result;
+  [self.plugin handleMethodCall:call
+                         result:^(id r) {
+                           result = r;
+                           [expectation fulfill];
+                         }];
+  [self waitForExpectations:@[ expectation ] timeout:5];
+  NSLog(@"%@", result);
+  XCTAssertNotNil(result);
+}
+
+- (void)testRefreshReceiptRequest {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"expect success"];
+  FlutterMethodCall* call =
+      [FlutterMethodCall methodCallWithMethodName:@"-[InAppPurchasePlugin refreshReceipt:result:]"
+                                        arguments:nil];
+  __block BOOL result = NO;
+  [self.plugin handleMethodCall:call
+                         result:^(id r) {
+                           result = YES;
+                           [expectation fulfill];
+                         }];
+  [self waitForExpectations:@[ expectation ] timeout:5];
+  XCTAssertTrue(result);
+}
+
 @end

packages/in_app_purchase/example/ios/in_app_purchase_pluginTests/ProductRequestHandlerTest.m

@@ -52,4 +52,37 @@ - (void)testRequestHandlerWithProductRequestFailure {
   XCTAssertNil(response);
 }
 
+- (void)testRequestHandlerWithRefreshReceiptSuccess {
+  SKReceiptRefreshRequestStub *request =
+      [[SKReceiptRefreshRequestStub alloc] initWithReceiptProperties:nil];
+  FIAPRequestHandler *handler = [[FIAPRequestHandler alloc] initWithRequest:request];
+  XCTestExpectation *expectation = [self expectationWithDescription:@"expect no error"];
+  __block NSError *e;
+  [handler
+      startProductRequestWithCompletionHandler:^(SKProductsResponse *_Nullable r, NSError *error) {
+        e = error;
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:5];
+  XCTAssertNil(e);
+}
+
+- (void)testRequestHandlerWithRefreshReceiptFailure {
+  SKReceiptRefreshRequestStub *request = [[SKReceiptRefreshRequestStub alloc]
+      initWithFailureError:[NSError errorWithDomain:@"test" code:123 userInfo:@{}]];
+  FIAPRequestHandler *handler = [[FIAPRequestHandler alloc] initWithRequest:request];
+  XCTestExpectation *expectation = [self expectationWithDescription:@"expect error"];
+  __block NSError *error;
+  __block SKProductsResponse *response;
+  [handler startProductRequestWithCompletionHandler:^(SKProductsResponse *_Nullable r, NSError *e) {
+    error = e;
+    response = r;
+    [expectation fulfill];
+  }];
+  [self waitForExpectations:@[ expectation ] timeout:5];
+  XCTAssertNotNil(error);
+  XCTAssertEqual(error.domain, @"test");
+  XCTAssertNil(response);
+}
+
 @end

packages/in_app_purchase/example/ios/in_app_purchase_pluginTests/Stubs.h

@@ -4,6 +4,7 @@
 
 #import <Foundation/Foundation.h>
 #import <StoreKit/StoreKit.h>
+#import "FIAPReceiptManager.h"
 #import "FIAPRequestHandler.h"
 #import "InAppPurchasePlugin.h"
 
@@ -53,4 +54,11 @@ NS_ASSUME_NONNULL_BEGIN
 - (instancetype)initWithMap:(NSDictionary *)map;
 @end
 
+@interface FIAPReceiptManagerStub : FIAPReceiptManager
+@end
+
+@interface SKReceiptRefreshRequestStub : SKReceiptRefreshRequest
+- (instancetype)initWithFailureError:(NSError *)error;
+@end
+
 NS_ASSUME_NONNULL_END

packages/in_app_purchase/example/ios/in_app_purchase_pluginTests/Stubs.m

@@ -98,7 +98,6 @@ - (void)start {
   } else {
     [self.delegate productsRequest:self didReceiveResponse:response];
   }
-  [self.delegate requestDidFinish:self];
 }
 
 @end
@@ -134,6 +133,10 @@ - (SKProduct *)getProduct:(NSString *)productID {
   return [SKProduct new];
 }
 
+- (SKReceiptRefreshRequestStub *)getRefreshReceiptRequest:(NSDictionary *)properties {
+  return [[SKReceiptRefreshRequestStub alloc] initWithReceiptProperties:properties];
+}
+
 @end
 
 @interface SKPaymentQueueStub ()
@@ -235,3 +238,37 @@ - (instancetype)initWithMap:(NSDictionary *)map {
 }
 
 @end
+
+@implementation FIAPReceiptManagerStub : FIAPReceiptManager
+
+- (NSData *)getReceiptData:(NSURL *)url {
+  NSString *originalString = [NSString stringWithFormat:@"test"];
+  return [[NSData alloc] initWithBase64EncodedString:originalString options:kNilOptions];
+}
+
+@end
+
+@implementation SKReceiptRefreshRequestStub {
+  NSError *_error;
+}
+
+- (instancetype)initWithReceiptProperties:(NSDictionary<NSString *, id> *)properties {
+  self = [super initWithReceiptProperties:properties];
+  return self;
+}
+
+- (instancetype)initWithFailureError:(NSError *)error {
+  self = [super init];
+  _error = error;
+  return self;
+}
+
+- (void)start {
+  if (_error) {
+    [self.delegate request:self didFailWithError:_error];
+  } else {
+    [self.delegate requestDidFinish:self];
+  }
+}
+
+@end

packages/in_app_purchase/ios/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
+
+- (NSString *)retrieveReceiptWithError:(FlutterError **)error;
+
+@end
+
+NS_ASSUME_NONNULL_END

packages/in_app_purchase/ios/Classes/FIAPReceiptManager.m

@@ -0,0 +1,29 @@
+//
+//  FIAPReceiptManager.m
+//  in_app_purchase
+//
+//  Created by Chris Yang on 3/2/19.
+//
+
+#import "FIAPReceiptManager.h"
+#import <Flutter/Flutter.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/ios/Classes/FIAPRequestHandler.h

@@ -12,7 +12,7 @@ typedef void (^ProductRequestCompletion)(SKProductsResponse *_Nullable response,
 
 @interface FIAPRequestHandler : NSObject
 
-- (instancetype)initWithRequest:(SKProductsRequest *)request;
+- (instancetype)initWithRequest:(SKRequest *)request;
 - (void)startProductRequestWithCompletionHandler:(ProductRequestCompletion)completion;
 
 @end

packages/in_app_purchase/ios/Classes/FIAPRequestHandler.m

@@ -10,13 +10,13 @@
 @interface FIAPRequestHandler () <SKProductsRequestDelegate>
 
 @property(copy, nonatomic) ProductRequestCompletion completion;
-@property(strong, nonatomic) SKProductsRequest *request;
+@property(strong, nonatomic) SKRequest *request;
 
 @end
 
 @implementation FIAPRequestHandler
 
-- (instancetype)initWithRequest:(SKProductsRequest *)request {
+- (instancetype)initWithRequest:(SKRequest *)request {
   self = [super init];
   if (self) {
     self.request = request;
@@ -34,11 +34,16 @@ - (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;
   }
 }
 
-// Reserved for other SKRequests.
 - (void)requestDidFinish:(SKRequest *)request {
+  if (self.completion) {
+    self.completion(nil, nil);
+  }
 }
 
 - (void)request:(SKRequest *)request didFailWithError:(NSError *)error {

packages/in_app_purchase/ios/Classes/InAppPurchasePlugin.h

@@ -4,9 +4,12 @@
 
 #import <Flutter/Flutter.h>
 @class FIAPaymentQueueHandler;
+@class FIAPReceiptManager;
 
 @interface InAppPurchasePlugin : NSObject <FlutterPlugin>
 
 @property(strong, nonatomic) FIAPaymentQueueHandler *paymentQueueHandler;
 
+- (instancetype)initWithReceiptManager:(FIAPReceiptManager *)receiptManager;
+
 @end

packages/in_app_purchase/ios/Classes/InAppPurchasePlugin.m

@@ -5,6 +5,7 @@
 #import "InAppPurchasePlugin.h"
 #import <StoreKit/StoreKit.h>
 #import "FIAObjectTranslator.h"
+#import "FIAPReceiptManager.h"
 #import "FIAPRequestHandler.h"
 #import "FIAPaymentQueueHandler.h"
 
@@ -24,6 +25,8 @@ @interface InAppPurchasePlugin ()
 @property(strong, nonatomic) NSObject<FlutterBinaryMessenger> *messenger;
 @property(strong, nonatomic) NSObject<FlutterPluginRegistrar> *registrar;
 
+@property(strong, nonatomic) FIAPReceiptManager *receiptManager;
+
 @end
 
 @implementation InAppPurchasePlugin
@@ -36,11 +39,18 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
   [registrar addMethodCallDelegate:instance channel:channel];
 }
 
-- (instancetype)initWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
+- (instancetype)initWithReceiptManager:(FIAPReceiptManager *)receiptManager {
   self = [self init];
+  self.receiptManager = receiptManager;
+  return self;
+}
+
+- (instancetype)initWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
+  self = [self initWithReceiptManager:[FIAPReceiptManager new]];
   self.registrar = registrar;
   self.registry = [registrar textures];
   self.messenger = [registrar messenger];
+
   __weak typeof(self) weakSelf = self;
   self.paymentQueueHandler =
       [[FIAPaymentQueueHandler alloc] initWithQueue:[SKPaymentQueue defaultQueue]
@@ -79,6 +89,10 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
     [self finishTransaction:call result:result];
   } else if ([@"-[InAppPurchasePlugin restoreTransactions:result:]" isEqualToString:call.method]) {
     [self restoreTransactions:call result:result];
+  } else if ([@"-[InAppPurchasePlugin retrieveReceiptData:result:]" isEqualToString:call.method]) {
+    [self retrieveReceiptData:call result:result];
+  } else if ([@"-[InAppPurchasePlugin refreshReceipt:result:]" isEqualToString:call.method]) {
+    [self refreshReceipt:call result:result];
   } else {
     result(FlutterMethodNotImplemented);
   }
@@ -206,6 +220,50 @@ - (void)restoreTransactions:(FlutterMethodCall *)call result:(FlutterResult)resu
   [self.paymentQueueHandler restoreTransactions:call.arguments];
 }
 
+- (void)retrieveReceiptData:(FlutterMethodCall *)call result:(FlutterResult)result {
+  FlutterError *error = nil;
+  NSString *receiptData = [self.receiptManager retrieveReceiptWithError:&error];
+  if (error) {
+    result(error);
+    return;
+  }
+  result(receiptData);
+}
+
+- (void)refreshReceipt:(FlutterMethodCall *)call result:(FlutterResult)result {
+  NSDictionary *arguments = call.arguments;
+  SKReceiptRefreshRequest *request;
+  if (arguments) {
+    if (![arguments isKindOfClass:[NSDictionary class]]) {
+      result([FlutterError errorWithCode:@"storekit_invalid_argument"
+                                 message:@"Argument type of startRequest is not array"
+                                 details:call.arguments]);
+      return;
+    }
+    NSMutableDictionary *properties = [NSMutableDictionary new];
+    properties[SKReceiptPropertyIsExpired] = arguments[@"isExpired"];
+    properties[SKReceiptPropertyIsRevoked] = arguments[@"isRevoked"];
+    properties[SKReceiptPropertyIsVolumePurchase] = arguments[@"isVolumePurchase"];
+    request = [self getRefreshReceiptRequest:properties];
+  } else {
+    request = [self getRefreshReceiptRequest:nil];
+  }
+  FIAPRequestHandler *handler = [[FIAPRequestHandler alloc] initWithRequest:request];
+  [self.requestHandlers addObject:handler];
+  __weak typeof(self) weakSelf = self;
+  [handler startProductRequestWithCompletionHandler:^(SKProductsResponse *_Nullable response,
+                                                      NSError *_Nullable error) {
+    if (error) {
+      result([FlutterError errorWithCode:@"storekit_refreshreceiptrequest_platform_error"
+                                 message:error.description
+                                 details:error.userInfo]);
+      return;
+    }
+    result(nil);
+    [weakSelf.requestHandlers removeObject:handler];
+  }];
+}
+
 #pragma mark - delegates
 
 - (void)handleTransactionsUpdated:(NSArray<SKPaymentTransaction *> *)transactions {
@@ -267,6 +325,10 @@ - (SKProduct *)getProduct:(NSString *)productID {
   return [self.productsCache objectForKey:productID];
 }
 
+- (SKReceiptRefreshRequest *)getRefreshReceiptRequest:(NSDictionary *)properties {
+  return [[SKReceiptRefreshRequest alloc] initWithReceiptProperties:properties];
+}
+
 #pragma mark - getter
 
 - (NSSet *)requestHandlers {

packages/in_app_purchase/lib/src/store_kit_wrappers/sk_receipt_manager.dart

@@ -0,0 +1,21 @@
+// 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 'dart:async';
+import 'package:in_app_purchase/src/channel.dart';
+
+///This class contains static methods to manage StoreKit receipts.
+class SKReceiptManager {
+  /// Retrieve the receipt data from your application's main bundle.
+  ///
+  /// The receipt data will be based64 encoded. The structure of the payload is defined using ASN.1.
+  /// You can use the receipt data retrieved by this method to validate users' purchases.
+  /// There are 2 ways to do so. Either validate locally or validate with App Store.
+  /// For more details on how to validate the receipt data, you can refer to Apple's document about [`About Receipt Validation`](https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Introduction.html#//apple_ref/doc/uid/TP40010573-CH105-SW1).
+  /// If the receipt is invalid or missing, you can use [SKRequestMaker.startRefreshReceiptRequest] to request a new receipt.
+  Future<String> retrieveReceiptData() {
+    return channel
+        .invokeMethod('-[InAppPurchasePlugin retrieveReceiptData:result:]');
+  }
+}