push registration no longer depends on notification permission, reporting effective opt-in and os permission

lib/push/push_registration.dart

@@ -355,9 +355,8 @@ class PushRegistration {
       status != AuthorizationStatus.deniedPermanently;
 
   /// Requests the OS notification permission (covers iOS + Android 13) and
-  /// returns whether registration should proceed. Errors from the plugin are
-  /// treated as usable — better a possibly-idle registration than silently
-  /// losing push over a transient failure.
+  /// returns whether it is usable (not explicitly denied). Errors from the
+  /// plugin are treated as usable so a transient failure never nags the user.
   static Future<bool> requestOsPermission() async {
     try {
       final settings = await FirebaseMessaging.instance.requestPermission();
@@ -368,54 +367,47 @@ class PushRegistration {
     }
   }
 
-  /// True when the user has explicitly denied the OS notification permission.
-  /// Read-only (no prompt) — used by the settings UI to surface the state.
-  static Future<bool> isOsPermissionDenied() async {
+  /// Current OS notification permission, or null when the plugin can't tell.
+  /// Read-only — never triggers the OS prompt.
+  static Future<AuthorizationStatus?> osPermissionStatus() async {
     try {
       final settings = await FirebaseMessaging.instance
           .getNotificationSettings();
-      return !isPermissionUsable(settings.authorizationStatus);
+      return settings.authorizationStatus;
     } on Object {
-      return false;
+      return null;
     }
   }
 
   /// True when the OS notification permission is already granted
   /// (`authorized`/`provisional`). Read-only — never triggers the OS prompt.
-  /// Used by the cold-start/self-heal path so it registers only for devices
-  /// that already opted in, leaving the actual prompt to the first Talk visit.
   static Future<bool> isOsPermissionGranted() async {
-    try {
-      final settings = await FirebaseMessaging.instance
-          .getNotificationSettings();
-      return settings.authorizationStatus == AuthorizationStatus.authorized ||
-          settings.authorizationStatus == AuthorizationStatus.provisional;
-    } on Object {
-      return false;
-    }
+    final status = await osPermissionStatus();
+    return status != null && canDisplay(status);
   }
 
+  /// Whether the OS will actually show a visible notification in [status].
+  /// Stricter than [isPermissionUsable]: `notDetermined` shows nothing yet.
+  static bool canDisplay(AuthorizationStatus status) =>
+      status == AuthorizationStatus.authorized ||
+      status == AuthorizationStatus.provisional;
+
   /// Registers this device whenever the backend advertises the push capability.
-  /// Deliberately independent of the in-app notification toggle: a user who
-  /// turned notifications off stays registered so silent sync pushes keep
-  /// flowing — the display is suppressed downstream via the mirrored flag (see
-  /// [PushRegistrationStore.notificationsEnabled]). Only registers when the OS
-  /// notification permission is *already* granted — it never triggers the OS
-  /// prompt itself. Requesting the permission is the job of the first Talk visit
-  /// (see `maybePromptTalkNotifications`), which keeps the prompt out of the
-  /// cold-start path. Safe to call on every start — Nextcloud dedups an
-  /// unchanged registration — which also self-heals a device whose registration
-  /// was lost.
+  /// Deliberately independent of both the in-app notification toggle and the
+  /// OS notification permission: silent sync pushes (deletes, chat/badge
+  /// refresh, widget refresh) need no permission — data-only FCM on Android,
+  /// `content-available` on iOS — so every device stays in sync. Whether a
+  /// visible notification is wanted is reported separately via the telemetry
+  /// heartbeat (toggle + OS permission), from which the server picks silent
+  /// pushes on iOS. Never triggers the OS prompt. Safe to call on every
+  /// start — Nextcloud dedups an unchanged registration — which also
+  /// self-heals a device whose registration was lost.
   /// Returns whether registration was actually *attempted* (all gates passed).
   /// Even a partial success persists the `general` device identifier, so the
   /// caller re-emits telemetry on `true` to reflect the fresh registration in
   /// the same session instead of lagging until the next launch.
   static Future<bool> syncSubscription({required bool capable}) async {
     if (!capable) return false;
-    if (!await isOsPermissionGranted()) {
-      log('Push: OS notification permission not granted, skipping registration');
-      return false;
-    }
     final registration = PushRegistration();
     // register() below refreshes an unchanged subscription anyway; the check
     // only surfaces the endpoint switch in the log for diagnosability.