ios/chrome/browser/store_kit/store_kit_coordinator.mm

// Copyright 2018 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 "ios/chrome/browser/store_kit/store_kit_coordinator.h"

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

#include "base/logging.h"
#include "base/metrics/histogram_macros.h"

#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif

@interface StoreKitCoordinator () <SKStoreProductViewControllerDelegate>
// StoreKitViewController to present. Set as a weak reference so it only exists
// while its being presented by baseViewController.
@property(nonatomic, weak) SKStoreProductViewController* viewController;
@end

@implementation StoreKitCoordinator
@synthesize iTunesProductParameters = _iTunesProductParameters;

#pragma mark - Public

- (void)start {
  DCHECK(self.iTunesProductParameters
             [SKStoreProductParameterITunesItemIdentifier]);
  // StoreKit shouldn't be launched, if there is one already presented.
  if (self.viewController)
    return;
  SKStoreProductViewController* viewController =
      [[SKStoreProductViewController alloc] init];
  viewController.delegate = self;
  [viewController
      loadProductWithParameters:self.iTunesProductParameters
                completionBlock:^(BOOL result, NSError* _Nullable error) {
                  UMA_HISTOGRAM_BOOLEAN("IOS.StoreKitLoadedSuccessfully",
                                        result);
                }];
  [self.baseViewController presentViewController:viewController
                                        animated:YES
                                      completion:nil];
  self.viewController = viewController;
}

- (void)stop {
  // Do not call -dismissViewControllerAnimated:completion: on
  // |self.baseViewController|, since the receiver of the method can be
  // dismissed if there is no presented view controller. On iOS 12
  // SKStoreProductViewControllerDelegate is responsible for dismissing
  // SKStoreProductViewController. On iOS 13.0 OS dismisses
  // SKStoreProductViewController after calling -productViewControllerDidFinish:
  // On iOS 13.2 OS dismisses SKStoreProductViewController before calling
  // -productViewControllerDidFinish: Calling
  // -dismissViewControllerAnimated:completion: on |self.baseViewController| on
  // iOS 13.2 will dismiss base view controller and break the application UI.
  // According to SKStoreProductViewController documentation the delegate is
  // responsible for calling deprecated dismissModalViewControllerAnimated: so
  // the documentation is clearly outdated and this code should be resilient to
  // different SKStoreProductViewController behavior without relying on iOS
  // version check (see crbug.com/1027058).
  [self.viewController dismissViewControllerAnimated:YES completion:nil];

  self.viewController = nil;
}

#pragma mark - StoreKitLauncher

- (void)openAppStore:(NSString*)iTunesItemIdentifier {
  [self openAppStoreWithParameters:@{
    SKStoreProductParameterITunesItemIdentifier : iTunesItemIdentifier
  }];
}

- (void)openAppStoreWithParameters:(NSDictionary*)productParameters {
  self.iTunesProductParameters = productParameters;
  [self start];
}

#pragma mark - SKStoreProductViewControllerDelegate

- (void)productViewControllerDidFinish:
    (SKStoreProductViewController*)viewController {
  [self stop];
}

@end