Add in-app purchase methods

client/platforms/ios/StoreKitController.mm

@@ -0,0 +1,129 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#import "StoreKitController.h"
+#import <StoreKit/StoreKit.h>
+
+@interface StoreKitController () <SKProductsRequestDelegate, SKPaymentTransactionObserver>
+@property (nonatomic, copy) void (^purchaseCompletion)(BOOL success, NSError *_Nullable error);
+@property (nonatomic, copy) void (^restoreCompletion)(BOOL success, NSError *_Nullable error);
+@property (nonatomic, strong) SKProductsRequest *productsRequest;
+@end
+
+@implementation StoreKitController
+
++ (instancetype)sharedInstance
+{
+    static dispatch_once_t onceToken;
+    static StoreKitController *instance;
+    dispatch_once(&onceToken, ^{
+        instance = [[StoreKitController alloc] init];
+    });
+    return instance;
+}
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
+    }
+    return self;
+}
+
+- (void)dealloc
+{
+    [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
+}
+
+- (void)purchaseProduct:(NSString *)productIdentifier
+             completion:(void (^)(BOOL success, NSError *_Nullable error))completion
+{
+    self.purchaseCompletion = completion;
+    self.productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:productIdentifier]];
+    self.productsRequest.delegate = self;
+    [self.productsRequest start];
+}
+
+- (void)restorePurchasesWithCompletion:(void (^)(BOOL success, NSError *_Nullable error))completion
+{
+    self.restoreCompletion = completion;
+    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
+}
+
+#pragma mark - SKProductsRequestDelegate
+
+- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
+{
+    SKProduct *product = response.products.firstObject;
+    if (!product) {
+        if (self.purchaseCompletion) {
+            NSError *error = [NSError errorWithDomain:@"StoreKitController"
+                                                 code:0
+                                             userInfo:@{ NSLocalizedDescriptionKey : @"Product not found" }];
+            self.purchaseCompletion(NO, error);
+            self.purchaseCompletion = nil;
+        }
+        return;
+    }
+    SKPayment *payment = [SKPayment paymentWithProduct:product];
+    [[SKPaymentQueue defaultQueue] addPayment:payment];
+    self.productsRequest = nil;
+}
+
+- (void)request:(SKRequest *)request didFailWithError:(NSError *)error
+{
+    if (self.purchaseCompletion) {
+        self.purchaseCompletion(NO, error);
+        self.purchaseCompletion = nil;
+    }
+    self.productsRequest = nil;
+}
+
+#pragma mark - SKPaymentTransactionObserver
+
+- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray<SKPaymentTransaction *> *)transactions
+{
+    for (SKPaymentTransaction *transaction in transactions) {
+        switch (transaction.transactionState) {
+        case SKPaymentTransactionStatePurchased:
+            if (self.purchaseCompletion) {
+                self.purchaseCompletion(YES, nil);
+                self.purchaseCompletion = nil;
+            }
+            [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
+            self.productsRequest = nil;
+            break;
+        case SKPaymentTransactionStateFailed:
+            if (self.purchaseCompletion) {
+                self.purchaseCompletion(NO, transaction.error);
+                self.purchaseCompletion = nil;
+            }
+            [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
+            self.productsRequest = nil;
+            break;
+        case SKPaymentTransactionStateRestored: [[SKPaymentQueue defaultQueue] finishTransaction:transaction]; break;
+        case SKPaymentTransactionStatePurchasing:
+        case SKPaymentTransactionStateDeferred: break;
+        }
+    }
+}
+
+- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue
+{
+    if (self.restoreCompletion) {
+        self.restoreCompletion(YES, nil);
+        self.restoreCompletion = nil;
+    }
+}
+
+- (void)paymentQueue:(SKPaymentQueue *)queue restoreCompletedTransactionsFailedWithError:(NSError *)error
+{
+    if (self.restoreCompletion) {
+        self.restoreCompletion(NO, error);
+        self.restoreCompletion = nil;
+    }
+}
+
+@end