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[ECO-5119] Opt out default push handler #560

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@maratal maratal commented Jan 26, 2025

Closes #557

Some users use APNs via FCM, so there should be an option to turn-off default handling of push notifications in iOS Ably Flutter to give user an ability to handle it themselves or via FCM framework (similar opt-out exists in android's Ably Flutter via AndroidManifest).

Summary by CodeRabbit

  • New Features

    • Added configuration option for handling push notifications in iOS app
    • Introduced ability to conditionally enable Apple Push Notifications (APNs)
  • Improvements

    • Enhanced push notification handling flexibility
    • Updated iOS application entry point annotation

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Walkthrough

The changes focus on enhancing push notification handling in an iOS application using the Ably Flutter plugin. The modifications include updating the AppDelegate.swift with a new method for handling remote notifications, adding a configuration key in Info.plist to control push notification handling, and modifying the AblyFlutter.m to conditionally initialize push notification event handlers based on a new configuration parameter.

Changes

File Change Summary
example/ios/Runner/AppDelegate.swift - Replaced @UIApplicationMain with @main annotation
- Added new method application(_:didReceiveRemoteNotification:fetchCompletionHandler:) for logging notifications
example/ios/Runner/Info.plist - Added AblyFlutterHandlePushNotifications key with true value
ios/Classes/AblyFlutter.m - Updated initWithChannel:streamsChannel:registrar: method signature
- Added handleAPNs parameter to conditionally handle push notifications

Assessment against linked issues

Objective Addressed Explanation
Resolve app crash when opening notification [#557, ECO-5119] Partial configuration changes, but full resolution requires further investigation

Poem

🐰 A rabbit's tale of push notification glee,
Code dancing swift, setting notifications free
From @UIApplicationMain to @main we leap
Ably's Flutter plugin, no more crashes to keep!
Hop, hop, hooray for smoother notification play! 🚀


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Actionable comments posted: 0

🧹 Nitpick comments (4)
example/ios/Runner/AppDelegate.swift (2)

18-23: Consider using modern UNUserNotificationCenter API.

While this example is intentionally simple, it's using a deprecated API. Consider adding a second example using the recommended UNUserNotificationCenter API to demonstrate best practices.

Here's an example implementation using the modern API:

func userNotificationCenter(_ center: UNUserNotificationCenter,
                          didReceive response: UNNotificationResponse,
                          withCompletionHandler completionHandler: @escaping () -> Void) {
    let userInfo = response.notification.request.content.userInfo
    NSLog("Notification received: \(userInfo)")
    completionHandler()
}

18-23: Enhance the example push notification handling.

While this provides a basic example, it uses a deprecated API and only logs the notification. Consider:

  1. Using the recommended UNUserNotificationCenterDelegate methods instead
  2. Adding more comprehensive example handling

Here's an improved example using modern APIs:

-    override func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
-        NSLog("Notification received: \(userInfo)")
-    }
+    // MARK: - UNUserNotificationCenterDelegate
+    
+    func userNotificationCenter(
+        _ center: UNUserNotificationCenter,
+        willPresent notification: UNNotification,
+        withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void
+    ) {
+        let userInfo = notification.request.content.userInfo
+        NSLog("Notification received in foreground: \(userInfo)")
+        
+        // Example: Show banner and play sound for important notifications
+        if let aps = userInfo["aps"] as? [String: Any],
+           let category = aps["category"] as? String,
+           category == "IMPORTANT" {
+            completionHandler([.banner, .sound])
+        } else {
+            completionHandler([])
+        }
+    }
+    
+    func userNotificationCenter(
+        _ center: UNUserNotificationCenter,
+        didReceive response: UNNotificationResponse,
+        withCompletionHandler completionHandler: @escaping () -> Void
+    ) {
+        let userInfo = response.notification.request.content.userInfo
+        NSLog("Notification response received: \(userInfo)")
+        
+        // Example: Handle notification tap
+        switch response.actionIdentifier {
+        case UNNotificationDefaultActionIdentifier:
+            // Handle default tap action
+            break
+        case UNNotificationDismissActionIdentifier:
+            // Handle dismiss action
+            break
+        default:
+            // Handle custom actions
+            break
+        }
+        
+        completionHandler()
+    }
example/ios/Runner/Info.plist (2)

5-6: Document the new configuration key.

The new configuration key is correctly implemented. Consider adding documentation in the README or migration guide to explain:

  • Purpose of the AblyFlutterHandlePushNotifications key
  • Default value and its implications
  • Steps to opt out of default push handling

5-6: LGTM: Well-structured configuration key.

The new configuration key follows platform conventions and maintains backward compatibility with its default value of true.

Consider adding a comment in the Info.plist to document this feature:

 	<key>AblyFlutterHandlePushNotifications</key>
+	<!-- Set to false to opt out of Ably's default push notification handling -->
 	<true/>
📜 Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between ccdd598 and 4399f09.

📒 Files selected for processing (3)
  • example/ios/Runner/AppDelegate.swift (1 hunks)
  • example/ios/Runner/Info.plist (1 hunks)
  • ios/Classes/AblyFlutter.m (2 hunks)
⏰ Context from checks skipped due to timeout of 90000ms (5)
  • GitHub Check: android (29)
  • GitHub Check: ios
  • GitHub Check: android (24)
  • GitHub Check: android
  • GitHub Check: ios (iPhone 15)
🔇 Additional comments (6)
example/ios/Runner/AppDelegate.swift (2)

4-4: LGTM! Modern Swift syntax used.

The update from @UIApplicationMain to @main follows modern Swift conventions.


4-4: LGTM: Modern Swift syntax used.

The change from @UIApplicationMain to @main follows modern Swift conventions.

ios/Classes/AblyFlutter.m (4)

698-702: LGTM! Proper handling of configuration with backward compatibility.

The implementation correctly:

  • Reads the configuration from Info.plist
  • Provides a default value of YES for backward compatibility
  • Safely handles the case when the key is not present

724-729: LGTM! Clean conditional initialization of push handlers.

The push notification handlers are only initialized when handleAPNs is true, effectively implementing the opt-out feature.


698-702: LGTM: Clean implementation of opt-out feature.

The implementation properly reads the configuration from Info.plist with null checking and maintains backward compatibility by defaulting to YES.


724-729: LGTM: Safe initialization of push notification handlers.

The code properly preserves the existing notification center delegate and only initializes the handlers when enabled.

@maratal maratal marked this pull request as draft January 28, 2025 13:05
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App crash when opening notification
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