neon: Add Nextcloud version compatibility checker

packages/neon/lib/l10n/en.arb

@@ -29,6 +29,14 @@
       }
     }
   },
+  "errorUnsupportedNextcloudVersion": "Sorry this Nextcloud instance version is not supported. You need at least version {version} of Nextcloud.",
+  "@errorUnsupportedNextcloudVersion" : {
+    "placeholders": {
+      "version": {
+        "type": "int"
+      }
+    }
+  },
   "validatorEmptyField": "This field can not be empty",
   "validatorInvalidURL": "Invalid URL provided",
   "delete": "Delete",

packages/neon/lib/l10n/localizations.dart

@@ -179,6 +179,12 @@ abstract class AppLocalizations {
   /// **'Permission for {name} is missing'**
   String errorMissingPermission(String name);
 
+  /// No description provided for @errorUnsupportedNextcloudVersion.
+  ///
+  /// In en, this message translates to:
+  /// **'Sorry this Nextcloud instance version is not supported. You need at least version {version} of Nextcloud.'**
+  String errorUnsupportedNextcloudVersion(int version);
+
   /// No description provided for @validatorEmptyField.
   ///
   /// In en, this message translates to:

packages/neon/lib/l10n/localizations_en.dart

@@ -56,6 +56,11 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Permission for $name is missing';
   }
 
+  @override
+  String errorUnsupportedNextcloudVersion(int version) {
+    return 'Sorry this Nextcloud instance version is not supported. You need at least version $version of Nextcloud.';
+  }
+
   @override
   String get validatorEmptyField => 'This field can not be empty';
 

packages/neon/lib/src/blocs/capabilities.dart

@@ -6,7 +6,7 @@ import 'package:rxdart/rxdart.dart';
 
 part 'capabilities.rxb.g.dart';
 
-typedef Capabilities = CoreServerCapabilitiesOcsDataCapabilities;
+typedef Capabilities = CoreServerCapabilitiesOcsData;
 typedef NextcloudTheme = CoreServerCapabilitiesOcsDataCapabilitiesTheming;
 
 abstract class CapabilitiesBlocEvents {}
@@ -26,12 +26,12 @@ class CapabilitiesBloc extends $CapabilitiesBloc {
 
   void _loadCapabilities() {
     _requestManager
-        .wrapNextcloud<Capabilities, CoreServerCapabilities, void, NextcloudCoreClient>(
+        .wrapNextcloud<CoreServerCapabilitiesOcsData, CoreServerCapabilities, void, NextcloudCoreClient>(
           _client.id,
           _client.core,
           'capabilities',
           () async => (await _client.core.getCapabilities())!,
-          (final response) => response.ocs!.data!.capabilities!,
+          (final response) => response.ocs!.data!,
           preloadCache: true,
         )
         .listen(_capabilitiesSubject.add);

packages/neon/lib/src/blocs/capabilities.rxb.g.dart

@@ -20,13 +20,12 @@ abstract class $CapabilitiesBloc extends RxBlocBase
   final _compositeSubscription = CompositeSubscription();
 
   /// The state of [capabilities] implemented in [_mapToCapabilitiesState]
-  late final BehaviorSubject<Result<CoreServerCapabilitiesOcsDataCapabilities>> _capabilitiesState =
+  late final BehaviorSubject<Result<CoreServerCapabilitiesOcsData>> _capabilitiesState = _mapToCapabilitiesState();
-      _mapToCapabilitiesState();
 
   @override
-  BehaviorSubject<Result<CoreServerCapabilitiesOcsDataCapabilities>> get capabilities => _capabilitiesState;
+  BehaviorSubject<Result<CoreServerCapabilitiesOcsData>> get capabilities => _capabilitiesState;
 
-  BehaviorSubject<Result<CoreServerCapabilitiesOcsDataCapabilities>> _mapToCapabilitiesState();
+  BehaviorSubject<Result<CoreServerCapabilitiesOcsData>> _mapToCapabilitiesState();
 
   @override
   CapabilitiesBlocEvents get events => this;

packages/neon/lib/src/pages/home/home.dart

@@ -50,7 +50,31 @@ class _HomePageState extends State<HomePage> with tray.TrayListener, WindowListe
     );
     _capabilitiesBloc.capabilities.listen((final result) {
       if (result.data != null) {
-        widget.onThemeChanged(result.data!.theming!);
+        widget.onThemeChanged(result.data!.capabilities!.theming!);
+
+        // ignore cached version and prevent duplicate dialogs
+        if (result is ResultSuccess) {
+          const requiredMajorVersion = 24;
+          if (result.data!.version!.major! < requiredMajorVersion) {
+            showDialog(
+              context: context,
+              builder: (final context) => AlertDialog(
+                title: Text(AppLocalizations.of(context).errorUnsupportedNextcloudVersion(requiredMajorVersion)),
+                actions: [
+                  ElevatedButton(
+                    style: ElevatedButton.styleFrom(
+                      primary: Colors.red,
+                    ),
+                    onPressed: () {
+                      Navigator.of(context).pop();
+                    },
+                    child: Text(AppLocalizations.of(context).close),
+                  ),
+                ],
+              ),
+            );
+          }
+        }
       }
     });
     _appsBloc = AppsBloc(
@@ -410,15 +434,15 @@ class _HomePageState extends State<HomePage> with tray.TrayListener, WindowListe
                                         children: [
                                           if (capabilitiesData != null) ...[
                                             Text(
-                                              capabilitiesData.theming!.name!,
+                                              capabilitiesData.capabilities!.theming!.name!,
                                               style: DefaultTextStyle.of(context).style.copyWith(
                                                     color: Theme.of(context).colorScheme.onPrimary,
                                                   ),
                                             ),
-                                            if (capabilitiesData.theming!.logo != null) ...[
+                                            if (capabilitiesData.capabilities!.theming!.logo != null) ...[
                                               Flexible(
                                                 child: CachedURLImage(
-                                                  url: capabilitiesData.theming!.logo!,
+                                                  url: capabilitiesData.capabilities!.theming!.logo!,
                                                   requestManager: _requestManager,
                                                   client: widget.account.client,
                                                 ),