Read isReceiveReceiptsEnabled from resilient storage if needed

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalExtension/OneSignalReceiveReceiptsController.m

@@ -28,13 +28,22 @@
 #import <Foundation/Foundation.h>
 #import "OneSignalReceiveReceiptsController.h"
 #import <OneSignalCore/OneSignalCore.h>
+#import <OneSignalOSCore/OneSignalOSCore-Swift.h>
 #import "OSMacros.h"
 #import "OneSignalExtensionRequests.h"
 
 @implementation OneSignalReceiveReceiptsController
 
 - (BOOL)isReceiveReceiptsEnabled {
-    return [OneSignalUserDefaults.initShared getSavedBoolForKey:OSUD_RECEIVE_RECEIPTS_ENABLED defaultValue:NO];
+    BOOL enabled = [OneSignalUserDefaults.initShared getSavedBoolForKey:OSUD_RECEIVE_RECEIPTS_ENABLED defaultValue:NO];
+    if (enabled) {
+        return YES;
+    }
+    // UserDefaults may return NO for two reasons: the flag is genuinely off, or the shared
+    // UserDefaults file isn't readable right now (NSE running while device is locked under
+    // NSFileProtectionCompleteUntilFirstUserAuthentication). Fall back to the unencrypted cache.
+    NSString *cached = [OSResilientStorage stringForKey:OSResilientStorage.keyReceiveReceiptsEnabled];
+    return [cached isEqualToString:@"1"];
 }
 
 - (void)sendReceiveReceiptWithNotificationId:(NSString *)notificationId {