Added iOS Critical Alerts Permission Strategy

permission_handler/README.md

@@ -100,6 +100,9 @@ You must list permission you want to use in your application :
            ## dart: PermissionGroup.notification
            # 'PERMISSION_NOTIFICATIONS=1',
   
+           ## dart: PermissionGroup.criticalAlerts
+           # 'PERMISSION_CRITICAL_ALERTS=1',
+  
            ## dart: PermissionGroup.mediaLibrary
            # 'PERMISSION_MEDIA_LIBRARY=1',
   
@@ -136,6 +139,7 @@ You must list permission you want to use in your application :
    | PermissionGroup.photos                                                                      | NSPhotoLibraryUsageDescription                                                                                | PERMISSION_PHOTOS                    |
    | PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse | NSLocationUsageDescription, NSLocationAlwaysAndWhenInUseUsageDescription, NSLocationWhenInUseUsageDescription | PERMISSION_LOCATION                  |
    | PermissionGroup.notification                                                                | PermissionGroupNotification                                                                                   | PERMISSION_NOTIFICATIONS             |
+   | PermissionGroup.criticalAlerts                                                              | PermissionGroupCriticalAlerts                                                                                 | PERMISSION_CRITICAL_ALERTS           |
    | PermissionGroup.mediaLibrary                                                                | NSAppleMusicUsageDescription, kTCCServiceMediaLibrary                                                         | PERMISSION_MEDIA_LIBRARY             |
    | PermissionGroup.sensors                                                                     | NSMotionUsageDescription                                                                                      | PERMISSION_SENSORS                   |
    | PermissionGroup.bluetooth                                                                   | NSBluetoothAlwaysUsageDescription, NSBluetoothPeripheralUsageDescription                                      | PERMISSION_BLUETOOTH                 |

permission_handler/example/ios/Podfile

@@ -72,6 +72,9 @@ post_install do |installer|
         ## dart: PermissionGroup.notification
         'PERMISSION_NOTIFICATIONS=1',
 
+        ## dart: PermissionGroup.criticalAlerts
+        'PERMISSION_CRITICAL_ALERTS=1',
+
         ## dart: PermissionGroup.mediaLibrary
         'PERMISSION_MEDIA_LIBRARY=1',
 

permission_handler/ios/Classes/PermissionHandlerEnums.h

@@ -102,6 +102,13 @@
     #define PERMISSION_APP_TRACKING_TRANSPARENCY 0
 #endif
 
+
+// ios: PermissionGroupCriticalAlerts
+// dart: PermissionGroup.criticalAlerts
+#ifndef PERMISSION_CRITICAL_ALERTS
+    #define PERMISSION_CRITICAL_ALERTS 0
+#endif
+
 typedef NS_ENUM(int, PermissionGroup) {
     PermissionGroupCalendar = 0,
     PermissionGroupCamera,
@@ -128,7 +135,8 @@ typedef NS_ENUM(int, PermissionGroup) {
     PermissionGroupManageExternalStorage,
     PermissionGroupSystemAlertWindow,
     PermissionGroupRequestInstallPackages,
-    PermissionGroupAppTrackingTransparency
+    PermissionGroupAppTrackingTransparency,
+    PermissionGroupCriticalAlerts
 };
 
 typedef NS_ENUM(int, PermissionStatus) {

permission_handler/ios/Classes/PermissionManager.h

@@ -24,6 +24,7 @@
 #import "StoragePermissionStrategy.h"
 #import "UnknownPermissionStrategy.h"
 #import "NotificationPermissionStrategy.h"
+#import "CriticalAlertsPermissionStrategy.h"
 #import "PermissionHandlerEnums.h"
 #import "Codec.h"
 

permission_handler/ios/Classes/PermissionManager.m

@@ -127,6 +127,8 @@
             return [BluetoothPermissionStrategy new];
         case PermissionGroupAppTrackingTransparency:
             return [AppTrackingTransparencyPermissionStrategy new];
+        case PermissionGroupCriticalAlerts:
+            return [CriticalAlertsPermissionStrategy new];
         default:
             return [UnknownPermissionStrategy new];
     }

permission_handler/ios/Classes/strategies/CriticalAlertsPermissionStrategy.h

+//
+//  CriticalAlertsPermissionStrategy.h
+//  permission_handler
+//
+//  Created by Neal Soni on 2021/6/8.
+//
+
+#import <Foundation/Foundation.h>
+#import "PermissionStrategy.h"
+
+#if PERMISSION_CRITICAL_ALERTS
+
+#import <UserNotifications/UserNotifications.h>
+
+@interface CriticalAlertsPermissionStrategy : NSObject <PermissionStrategy>
+
+@end
+
+#else
+
+#import "UnknownPermissionStrategy.h"
+@interface CriticalAlertsPermissionStrategy : UnknownPermissionStrategy
+@end
+
+#endif

permission_handler/ios/Classes/strategies/CriticalAlertsPermissionStrategy.m

+//
+//  CriticalAlertsPermissionStrategy.m
+//  permission_handler
+//
+//  Created by Neal Soni on 2021/6/8.
+//
+
+#import "CriticalAlertsPermissionStrategy.h"
+
+#if PERMISSION_CRITICAL_ALERTS
+
+@implementation CriticalAlertsPermissionStrategy
+
+- (PermissionStatus)checkPermissionStatus:(PermissionGroup)permission {
+  return [CriticalAlertsPermissionStrategy permissionStatus];
+}
+
+- (ServiceStatus)checkServiceStatus:(PermissionGroup)permission {
+  return ServiceStatusNotApplicable;
+}
+
+- (void)requestPermission:(PermissionGroup)permission completionHandler:(PermissionStatusHandler)completionHandler {
+  PermissionStatus status = [self checkPermissionStatus:permission];
+  if (status != PermissionStatusDenied) {
+    completionHandler(status);
+    return;
+  }
+  dispatch_async(dispatch_get_main_queue(), ^{
+    if(@available(iOS 12.0, *)) {
+      UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
+      UNAuthorizationOptions authorizationOptions = 0;
+      authorizationOptions += UNAuthorizationOptionCriticalAlert;
+      [center requestAuthorizationWithOptions:(authorizationOptions) completionHandler:^(BOOL granted, NSError * _Nullable error) {
+        if (error != nil || !granted) {
+          completionHandler(PermissionStatusPermanentlyDenied);
+          return;
+        }
+
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[UIApplication sharedApplication] registerForRemoteNotifications];
+            completionHandler(PermissionStatusGranted);
+        });
+      }];
+    } else {
+      completionHandler(PermissionStatusPermanentlyDenied);
+    }
+  });
+}
+
++ (PermissionStatus)permissionStatus {
+  __block PermissionStatus permissionStatus = PermissionStatusGranted;
+  if (@available(iOS 12 , *)) {
+    dispatch_semaphore_t sem = dispatch_semaphore_create(0);
+    [[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
+      if (settings.criticalAlertSetting == UNAuthorizationStatusDenied) {
+        permissionStatus = PermissionStatusPermanentlyDenied;
+      } else if (settings.criticalAlertSetting == UNAuthorizationStatusNotDetermined) {
+        permissionStatus = PermissionStatusDenied;
+      }
+      dispatch_semaphore_signal(sem);
+    }];
+    dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
+  } else {
+    permissionStatus = PermissionStatusPermanentlyDenied;
+  }
+
+  return permissionStatus;
+}
+
+@end
+
+#else
+
+@implementation CriticalAlertsPermissionStrategy
+@end
+
+#endif

permission_handler_platform_interface/lib/src/permissions.dart

@@ -143,6 +143,11 @@ class Permission {
   ///websites.
   static const appTrackingTransparency = Permission._(25);
 
+  ///Android: Nothing
+  ///iOS: Notifications that override your ringer
+  static const criticalAlerts = Permission._(26);
+
+
   /// Returns a list of all possible [PermissionGroup] values.
   static const List<Permission> values = <Permission>[
     calendar,
@@ -170,7 +175,8 @@ class Permission {
     manageExternalStorage,
     systemAlertWindow,
     requestInstallPackages,
-    appTrackingTransparency
+    appTrackingTransparency,
+    criticalAlerts
   ];
 
   static const List<String> _names = <String>[
@@ -199,7 +205,8 @@ class Permission {
     'manageExternalStorage',
     'systemAlertWindow',
     'requestInstallPackages',
-    'appTrackingTransparency'
+    'appTrackingTransparency',
+    'criticalAlerts'
   ];
 
   @override