[ios] support Notifications.getDevicePushTokenAsync in ExpoKit

Author: esamelson

ios/Exponent/Kernel/Services/Notifications/EXRemoteNotificationManager.m

@@ -110,13 +110,24 @@ - (void)registerAPNSToken:(nullable NSData *)token registrationError:(nullable N
 
 #pragma mark - scoped module delegate
 
-- (NSString *)apnsTokenStringForScopedModule:(__unused id)scopedModule
+- (void)getApnsTokenForScopedModule:(id)scopedModule
+                  completionHandler:(void (^)(NSString * _Nullable, NSError * _Nullable))handler
 {
-  NSData *maybeToken = _currentAPNSToken ?: [NSUserDefaults.standardUserDefaults objectForKey:kEXCurrentAPNSTokenDefaultsKey];
-  if (maybeToken) {
-    return [maybeToken apnsTokenString];
+  if (_currentAPNSToken) {
+    handler([_currentAPNSToken apnsTokenString], nil);
+    return;
   }
-  return nil;
+
+  [_apnsTokenHandlers addObject:^(NSData * _Nullable apnsToken, NSError * _Nullable registrationError) {
+    if (registrationError) {
+      handler(nil, registrationError);
+    } else {
+      handler([apnsToken apnsTokenString], nil);
+    }
+  }];
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [RCTSharedApplication() registerForRemoteNotifications];
+  });
 }
 
 - (void)getExpoPushTokenForScopedModule:(id)scopedModule

ios/Exponent/Versioned/Core/Api/EXNotifications.h

@@ -25,7 +25,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @protocol EXNotificationsScopedModuleDelegate
 
-- (NSString *)apnsTokenStringForScopedModule:(id)scopedModule;
+- (void)getApnsTokenForScopedModule:(id)scopedModule
+                  completionHandler:(void (^)(NSString * _Nullable, NSError * _Nullable))handler;
 - (void)getExpoPushTokenForScopedModule:(id)scopedModule
                       completionHandler:(void (^)(NSString * _Nullable pushToken, NSError * _Nullable error))handler;
 

ios/Exponent/Versioned/Core/Api/EXNotifications.m

@@ -68,11 +68,13 @@ - (instancetype)initWithExperienceId:(NSString *)experienceId kernelServiceDeleg
     return reject(0, @"getDevicePushTokenAsync is only accessible within standalone applications", nil);
   }
 
-  NSString *token = [_remoteNotificationsDelegate apnsTokenStringForScopedModule:self];
-  if (!token) {
-    return reject(0, @"APNS token has not been set", nil);
-  }
-  return resolve(@{ @"type": @"apns", @"data": token });
+  [_remoteNotificationsDelegate getApnsTokenForScopedModule:self completionHandler:^(NSString * _Nullable apnsToken, NSError * _Nullable error) {
+    if (error) {
+      reject(@"ERR_NOTIFICATIONS_PUSH_REGISTRATION_FAILED", error.localizedDescription, error);
+    } else {
+      resolve(@{ @"type": @"apns", @"data": apnsToken });
+    }
+  }];
 }
 
 RCT_REMAP_METHOD(getExponentPushTokenAsync,