electron/atom/browser/mac/in_app_purchase.mm

// Copyright (c) 2017 Amaplex Software, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/mac/in_app_purchase.h"

#include "base/bind.h"
#include "base/strings/sys_string_conversions.h"
#include "content/public/browser/browser_thread.h"

#import <CommonCrypto/CommonCrypto.h>
#import <StoreKit/StoreKit.h>

// ============================================================================
//                             InAppPurchase
// ============================================================================

// --------------------------------- Interface --------------------------------

@interface InAppPurchase : NSObject<SKProductsRequestDelegate> {
 @private
  in_app_purchase::InAppPurchaseCallback callback_;
  NSInteger quantity_;
}

- (id)initWithCallback:(const in_app_purchase::InAppPurchaseCallback&)callback
              quantity:(NSInteger)quantity;

- (void)purchaseProduct:(NSString*)productID;

@end

// ------------------------------- Implementation -----------------------------

@implementation InAppPurchase

/**
 * Init with a callback.
 *
 * @param callback - The callback that will be called when the payment is added
 * to the queue.
 */
- (id)initWithCallback:(const in_app_purchase::InAppPurchaseCallback&)callback
              quantity:(NSInteger)quantity {
  if ((self = [super init])) {
    callback_ = callback;
    quantity_ = quantity;
  }

  return self;
}

/**
 * Start the in-app purchase process.
 *
 * @param productID - The id of the product to purchase (the id of
 * com.example.app.product1 is product1).
 */
- (void)purchaseProduct:(NSString*)productID {
  // Retrieve the product information. (The products request retrieves,
  // information about valid products along with a list of the invalid product
  // identifiers, and then calls its delegate to process the result).
  SKProductsRequest* productsRequest;
  productsRequest = [[SKProductsRequest alloc]
      initWithProductIdentifiers:[NSSet setWithObject:productID]];

  productsRequest.delegate = self;
  [productsRequest start];
}

/**
 * Process product informations and start the payment.
 *
 * @param request - The product request.
 * @param response - The informations about the list of products.
 */
- (void)productsRequest:(SKProductsRequest*)request
     didReceiveResponse:(SKProductsResponse*)response {
  // Get the first product.
  NSArray* products = response.products;
  SKProduct* product = [products count] == 1 ? [products firstObject] : nil;

  // Return if the product is not found or invalid.
  if (product == nil) {
    [self runCallback:false];
    return;
  }

  // Start the payment process.
  [self checkout:product];
}

/**
 * Submit a payment request to the App Store.
 *
 * @param product - The product to purchase.
 */
- (void)checkout:(SKProduct*)product {
  // Add the payment to the transaction queue. (The observer will be called
  // when the transaction is finished).
  SKMutablePayment* payment = [SKMutablePayment paymentWithProduct:product];
  payment.quantity = quantity_;

  [[SKPaymentQueue defaultQueue] addPayment:payment];

  // Notify that the payment has been added to the queue with success.
  [self runCallback:true];
}

/**
 * Submit a payment request to the App Store.
 *
 * @param product - The product to purchase.
 */
- (void)runCallback:(bool)isProductValid {
  if (callback_) {
    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
                                     base::Bind(callback_, isProductValid));
  }
}

@end

// ============================================================================
//                             C++ in_app_purchase
// ============================================================================

namespace in_app_purchase {

bool CanMakePayments() {
  return [SKPaymentQueue canMakePayments];
}

std::string GetReceiptURL() {
  NSURL* receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];
  if (receiptURL != nil) {
    return [[receiptURL absoluteString] UTF8String];
  } else {
    return "";
  }
}

void PurchaseProduct(const std::string& productID,
                     const int quantity,
                     const InAppPurchaseCallback& callback) {
  auto iap =
      [[InAppPurchase alloc] initWithCallback:callback quantity:quantity];

  [iap purchaseProduct:base::SysUTF8ToNSString(productID)];
}

}  // namespace in_app_purchase