handle permission denials more gracefully

Thanks to Gomuks' new handling, we have sender displayname and avatar, and can use android's conversation notifications.

On other platforms, we just append sender name to the body, bolded if possible.

This also improves the logic on when to send notifications, as we drop notifs where `response["notification"]` is null.

We also now correctly set if notifications should play a sound or not, based on `PushNotification.sound`.

`PushNotification.image` handling might come sometime in the future, but it seems hard on Android.

.github/workflows/android.yml

@@ -27,7 +27,7 @@ jobs:
                   KEYSTORE_CONTENT: ${{ secrets.KEYSTORE_CONTENT }}
 
             - name: Build app
-              run: nix develop --command bash -c "flutter pub get && dart scripts/generate.dart && flutter pub run build_runner build && flutter build apk --target-platform android-arm64 --dart-define=GIT_COMMIT=${{ github.sha }}"
+              run: nix develop --command bash -c "flutter pub get && dart scripts/generate.dart && flutter pub run build_runner build && flutter build apk --target-platform android-arm64 --split-per-abi --dart-define=GIT_COMMIT=${{ github.sha }}"
               env:
                   KEYSTORE_PATH: ../../keystore.jks
                   KEYSTORE_PASSWORD: ${{ secrets.KEYSTORE_PASSWORD }}
@@ -36,4 +36,4 @@ jobs:
               uses: actions/upload-artifact@v6
               with:
                   name: APK
-                  path: build/app/outputs/flutter-apk/app-release.apk
+                  path: build/app/outputs/flutter-apk/app-arm64-v8a-release.apk

README.md

@@ -49,7 +49,7 @@ nexus = {
 This tracks the latest commit on `main`. To stay on a release instead, pin the input to its tag:
 
 ```nix
-url = "git+https://git.federated.nexus/Nexus/nexus?ref=refs/tags/v1.0.0-alpha2";
+url = "git+https://git.federated.nexus/Nexus/nexus?ref=refs/tags/v1.0.0-alpha4";
 ```
 
 Then import the module and enable it in your NixOS configuration:

gomuks

@@ -1 +1 @@
-Subproject commit ad275f7613894d9d2fa4d16d733a6816e2978de9
+Subproject commit 7e43a63e578b0d6f52269d65297198077bf5b45d

hook/build.dart

@@ -122,7 +122,7 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
       "sqlite_fts5",
       "goolm",
       // goheif/dav1d is not supported on Android or iOS, would need to be fixed upstream
-      if (targetOS == OS.android || targetOS == OS.iOS) "noheic",
+      "noheic",
     ].join(",");
 
     final archiveFile = targetOS == OS.iOS

lib/controllers/client.dart

@@ -31,6 +31,7 @@ import "package:nexus/models/requests/get_room_state.dart";
 import "package:nexus/models/requests/get_space_hierarchy.dart";
 import "package:nexus/models/requests/join_room.dart";
 import "package:nexus/models/profile_response.dart";
+import "package:nexus/models/push_notification.dart";
 import "package:nexus/models/recovery_key.dart";
 import "package:nexus/models/requests/oauth/exchange_token.dart";
 import "package:nexus/models/requests/oauth/get_auth_url.dart";
@@ -47,7 +48,6 @@ import "package:nexus/models/requests/set_membership.dart";
 import "package:nexus/models/requests/set_state.dart";
 import "package:nexus/models/requests/upload_media.dart";
 import "package:nexus/models/room.dart";
-import "package:nexus/models/room_metadata.dart";
 import "package:nexus/models/room_summary.dart";
 import "package:nexus/models/space_hierarchy.dart";
 import "package:nexus/models/spec_versions_response.dart";
@@ -128,18 +128,15 @@ class ClientController extends AsyncNotifier<int> {
     }
   }
 
-  Future<(Event, RoomMetadata)?> handlePush(Map<String, dynamic> data) async {
+  Future<PushNotification?> handlePush(Map<String, dynamic> data) async {
     final response = await callGomuksMethod(
       data,
       (handle, data) async => GomuksHandlePush(handle, data),
     );
 
-    return response == null
+    return response?["notification"] == null
         ? null
-        : (
+        : .fromJson(response["notification"]);
-            Event.fromJson(response["event"]),
-            RoomMetadata.fromJson(response["room"]),
-          );
   }
 
   Future<dynamic> _sendCommand(

lib/controllers/gomuks_listener.dart

@@ -17,6 +17,7 @@ import "package:nexus/helpers/extensions/gomuks_buffer.dart";
 import "package:nexus/main.dart";
 import "package:ffi/ffi.dart";
 import "package:nexus/models/event.dart";
+import "package:nexus/models/events_decrypted.dart";
 import "package:nexus/models/sync_data.dart";
 import "package:nexus/src/third_party/gomuks.g.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
@@ -60,6 +61,29 @@ class GomuksListenerController extends AsyncNotifier<void> {
                         event.roomId: .new(events: .new({event.rowId: event})),
                       }),
                     );
+              case "events_decrypted":
+                final decrypted = EventsDecrypted.fromJson(decodedMuksEvent);
+                final metadata = ref
+                    .read(RoomsController.provider)[decrypted.roomId]
+                    ?.metadata;
+
+                ref
+                    .read(RoomsController.provider.notifier)
+                    .update(
+                      .new({
+                        decrypted.roomId: .new(
+                          events: decrypted.events,
+                          metadata: metadata?.copyWith(
+                            previewEventRowID:
+                                decrypted.previewEventRowID ??
+                                metadata.previewEventRowID,
+                            sortingTimestamp:
+                                decrypted.sortingTimestamp ??
+                                metadata.sortingTimestamp,
+                          ),
+                        ),
+                      }),
+                    );
               case "sync_complete":
                 final syncData = SyncData.fromJson(decodedMuksEvent);
                 final roomProvider = RoomsController.provider;
@@ -119,6 +143,19 @@ class GomuksListenerController extends AsyncNotifier<void> {
     }
   }
 
+  /// Waits for gomuks to report the client's device ID
+  Future<String> deviceId() {
+    final completer = Completer<String>();
+    final subscription = ref.listen(
+      ClientStateController.provider.select((value) => value?.deviceId),
+      (_, next) {
+        if (next != null && !completer.isCompleted) completer.complete(next);
+      },
+      fireImmediately: true,
+    );
+    return completer.future.whenComplete(subscription.close);
+  }
+
   static Future<int> _start(
     int handle,
     Pointer<

lib/controllers/notification.dart

@@ -1,4 +1,5 @@
 import "dart:async";
+import "dart:convert";
 import "dart:io";
 
 import "package:flutter/services.dart";
@@ -103,24 +104,75 @@ class NotificationController
     return true;
   }
 
+  /// Whether notifications can currently be shown, without prompting
+  Future<bool> permissionsGranted() async {
+    if (Platform.isLinux) {
+      return true;
+    }
+
+    final controller = await future;
+
+    if (Platform.isIOS) {
+      return (await controller
+                  .resolvePlatformSpecificImplementation<
+                    IOSFlutterLocalNotificationsPlugin
+                  >()
+                  ?.checkPermissions())
+              ?.isEnabled ??
+          true;
+    } else if (Platform.isMacOS) {
+      return (await controller
+                  .resolvePlatformSpecificImplementation<
+                    MacOSFlutterLocalNotificationsPlugin
+                  >()
+                  ?.checkPermissions())
+              ?.isEnabled ??
+          true;
+    } else if (Platform.isAndroid) {
+      return await controller
+              .resolvePlatformSpecificImplementation<
+                AndroidFlutterLocalNotificationsPlugin
+              >()
+              ?.areNotificationsEnabled() ??
+          true;
+    }
+
+    return true;
+  }
+
   Future<void> send({
     required int id,
     required String title,
     String? body,
     File? icon,
     String? payload,
+    String? senderName,
+    File? senderAvatar,
+    String? selfName,
+    bool isGroup = false,
+    bool sound = true,
+    DateTime? timestamp,
+    String? threadId,
   }) async {
     debugPrint("Sending notification for $id");
 
+    // In DMs the title is already the sender, so only prefix in groups
+    final prefix = isGroup ? senderName : null;
+
     if (Platform.isLinux) {
-      final portal = await ref.watch(PortalController.provider.future);
+      final portal = await ref.read(PortalController.provider.future);
+      const escape = HtmlEscape(HtmlEscapeMode.element);
 
       await portal.notification.addNotification(
         id.toString(),
         title: title,
-        body: body,
+        body: prefix == null || body == null ? body : "$prefix: $body",
+        markupBody: prefix == null || body == null
+            ? null
+            : "<b>${escape.convert(prefix)}</b>: ${escape.convert(body)}",
         defaultAction: "app.event",
         defaultActionTarget: payload,
+        sound: sound ? null : const XdgNotificationSoundSilent(),
         category: XdgNotificationCategory.imReceived,
         priority: .normal,
         buttons: [
@@ -133,25 +185,64 @@ class NotificationController
         ],
       );
     } else {
+      final controller = await future;
+
+      // Append to the conversation already shown under this id, if any
+      final existingStyle = Platform.isAndroid
+          ? await controller
+                .resolvePlatformSpecificImplementation<
+                  AndroidFlutterLocalNotificationsPlugin
+                >()
+                ?.getActiveNotificationMessagingStyle(id: id)
+                .onError((_, _) => null)
+          : null;
+
+      final darwin = DarwinNotificationDetails(
+        presentSound: sound,
+        threadIdentifier: threadId,
+      );
       final notificationDetails = NotificationDetails(
         android: .new(
           "messages",
           "Messages",
+          silent: !sound,
           largeIcon: icon == null ? null : FilePathAndroidBitmap(icon.path),
+          styleInformation: senderName == null || body == null
+              ? null
+              : MessagingStyleInformation(
+                  .new(name: selfName ?? "You"),
+                  conversationTitle: isGroup ? title : null,
+                  groupConversation: isGroup,
+                  messages: [
+                    ...?existingStyle?.messages,
+                    .new(
+                      body,
+                      timestamp ?? .now(),
+                      .new(
+                        name: senderName,
+                        icon: senderAvatar == null
+                            ? null
+                            : BitmapFilePathAndroidIcon(senderAvatar.path),
+                      ),
+                    ),
+                  ],
+                ),
+        ),
+        iOS: darwin,
+        macOS: darwin,
+        windows: .new(
+          audio: sound ? null : .silent(),
+          timestamp: timestamp,
+          header: threadId == null
+              ? null
+              : .new(id: threadId, title: title, arguments: payload ?? ""),
         ),
-        // TODO: See if icons can be added to iOS, macOS, and Windows
-        // notifications (#68)
-        iOS: .new(),
-        macOS: .new(),
-        windows: .new(),
       );
 
-      final controller = await future;
-
       await controller.show(
         id: id,
         title: title,
-        body: body,
+        body: prefix == null || body == null ? body : "$prefix: $body",
         notificationDetails: notificationDetails,
         payload: payload,
       );

lib/controllers/room_chat.dart

@@ -25,6 +25,7 @@ class RoomChatController(final ChatParams info)
   @override
   Future<RoomChat?> build() async {
     final client = ref.read(ClientController.provider.notifier);
+
     final room = ref.read(
       RoomsController.provider.select((rooms) => rooms[info.roomId]),
     );

lib/controllers/selected_room.dart

@@ -0,0 +1,31 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/key.dart";
+import "package:nexus/controllers/selected_space.dart";
+import "package:nexus/helpers/extensions/get_all_child_rooms.dart";
+
+class SelectedRoomController extends Notifier<String?> {
+  @override
+  String? build() {
+    final roomId = ref.watch(
+      KeyController.provider(KeyController.roomKey)
+          .select((async) => async.value),
+    );
+
+    final roomIds = ref.watch(
+      SelectedSpaceController.provider.select(
+        (space) => space?.allChildRooms
+            .map((room) => room.metadata?.id)
+            .nonNulls
+            .toIList(),
+      ),
+    );
+    if (roomIds == null) return roomId;
+
+    return roomIds.contains(roomId) ? roomId : roomIds.firstOrNull;
+  }
+
+  static final provider = NotifierProvider<SelectedRoomController, String?>(
+    SelectedRoomController.new,
+  );
+}

lib/controllers/selected_space.dart

@@ -0,0 +1,25 @@
+import "package:collection/collection.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/key.dart";
+import "package:nexus/controllers/spaces.dart";
+import "package:nexus/models/space.dart";
+
+class SelectedSpaceController extends Notifier<Space?> {
+  @override
+  Space? build() {
+    final spaces = ref.watch(SpacesController.provider).value;
+    if (spaces == null) return null;
+
+    final spaceId = ref.watch(
+      KeyController.provider(KeyController.spaceKey)
+          .select((async) => async.value),
+    );
+
+    return spaces.firstWhereOrNull((space) => space.id == spaceId) ??
+        spaces.firstOrNull;
+  }
+
+  static final provider = NotifierProvider<SelectedSpaceController, Space?>(
+    SelectedSpaceController.new,
+  );
+}

lib/controllers/settings_sections.dart

@@ -46,7 +46,7 @@ class SettingsSectionsController
                 icon: Icon(icon),
                 title: title,
                 subtitle: Text(description),
-                initialValue: settings.theme,
+                value: settings.theme,
                 options: ThemeMode.values,
                 getName: (option) => toBeginningOfSentenceCase(option.name),
                 onChanged: (value) => ref
@@ -105,7 +105,7 @@ class SettingsSectionsController
                 icon: Icon(icon),
                 title: title,
                 subtitle: Text(description),
-                initialValue: settings.roomOrder,
+                value: settings.roomOrder,
                 options: RoomOrder.values,
                 getName: (option) => switch (option) {
                   .unreadFirst => "Mentioned, then unread",
@@ -117,6 +117,21 @@ class SettingsSectionsController
                     .onError(showError),
               ),
             ),
+            .new(
+              title: "Swipe To Reply",
+              description: "Swipe a message to the right to reply to it.",
+              icon: Icons.swipe_right,
+              builder: (title, description, icon) => SwitchListTile(
+                title: Text(title),
+                subtitle: Text(description),
+                secondary: Icon(icon),
+                value: settings.swipeToReply,
+                onChanged: (value) => ref
+                    .read(SettingsController.provider.notifier)
+                    .set(settings.copyWith(swipeToReply: value))
+                    .onError(showError),
+              ),
+            ),
             if (!Platform.isAndroid && !Platform.isIOS)
               .new(
                 title: "Show Minimize Button",
@@ -179,7 +194,6 @@ class SettingsSectionsController
                     final current = pusherRegistered.value;
 
                     return DialogListTile<String?>(
-                      key: ValueKey(current),
                       title: title,
                       subtitle: Text(
                         unifiedPushAllowed.maybeWhen(
@@ -189,8 +203,7 @@ class SettingsSectionsController
                             description,
                       ),
                       icon: Icon(icon),
-                      required: false,
+                      value: current,
-                      initialValue: current,
                       options: [
                         null,
                         ...?distributors.value,
@@ -212,23 +225,32 @@ class SettingsSectionsController
                                 try {
                                   loading.value = true;
                                   if (value != null) {
-                                    if (await ref
+                                    final messenger = ScaffoldMessenger.of(
+                                      context,
+                                    );
+                                    if (!await ref
                                         .read(
                                           NotificationController
                                               .provider
                                               .notifier,
                                         )
                                         .requestPermissions()) {
-                                      await ref
+                                      messenger.showSnackBar(
-                                          .read(
+                                        .new(
-                                            UnifiedPushController
+                                          content: Text(
-                                                .provider
+                                            "Notifications are disabled. Enable them for Nexus in your system settings.",
-                                                .notifier,
+                                          ),
-                                          )
+                                        ),
-                                          .register(value);
+                                      );
-                                    } else {
+                                      return;
-                                      // TODO: Handle not granted
                                     }
+                                    await ref
+                                        .read(
+                                          UnifiedPushController
+                                              .provider
+                                              .notifier,
+                                        )
+                                        .register(value);
                                   } else {
                                     await ref
                                         .read(
@@ -270,7 +292,7 @@ class SettingsSectionsController
                       icon: Icon(icon),
                       title: title,
                       subtitle: Text(description),
-                      initialValue: ref
+                      value: ref
                           .watch(AccountDataController.provider)
                           .invitePermissionConfig
                           .defaultAction,

lib/controllers/unified_push.dart

@@ -5,14 +5,12 @@ import "dart:io";
 import "package:flutter/foundation.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:intl/intl.dart";
-import "package:nexus/controllers/key.dart";
+import "package:nexus/controllers/selected_room.dart";
 import "package:nexus/controllers/notification.dart";
 import "package:nexus/controllers/push_key.dart";
 import "package:nexus/main.dart";
 import "package:nexus/controllers/client.dart";
-import "package:nexus/controllers/client_state.dart";
+import "package:nexus/controllers/gomuks_listener.dart";
-import "package:nexus/models/content/message.dart";
-import "package:nexus/models/content/sticker.dart";
 import "package:unifiedpush/unifiedpush.dart";
 import "package:unifiedpush_storage_shared_preferences/storage.dart";
 import "package:window_manager/window_manager.dart";
@@ -74,50 +72,67 @@ class UnifiedPushController extends AsyncNotifier<String?> {
       },
       onMessage: (message, instance) async {
         debugPrint("UP message received for $instance");
+        if (await deregisterIfDisabled(instance)) {
+          if (isInBackground) exit(0);
+          return;
+        }
+
         if (message.decrypted == false) {
           throw Exception(
             "Failed to decrypt notification. Try toggling off and on UnifiedPush in settings.",
           );
         }
-        final pushResponse = await ref
+        final notification = await ref
             .read(ClientController.provider.notifier)
             .handlePush(json.decode(String.fromCharCodes(message.content)));
 
-        if (pushResponse == null) return;
+        if (notification == null ||
-
-        final (event, roomMetadata) = pushResponse;
-
-        if (event.unreadType?.has(.notify) != true ||
             (!isInBackground &&
                 await windowManager.isFocused().onError((_, _) => true) &&
-                await ref.read(
+                ref.read(SelectedRoomController.provider) ==
-                      KeyController.provider(KeyController.roomKey).future,
+                    notification.roomId)) {
-                    ) ==
-                    event.roomId)) {
           if (isInBackground) exit(0);
           return;
         }
 
-        final icon = roomMetadata.avatar == null
+        final client = ref.read(ClientController.provider.notifier);
+
+        final icon = notification.roomAvatar == null
             ? null
-            : await ref
+            : await client.downloadMedia(
-                  .read(ClientController.provider.notifier)
+                .new(mxc: notification.roomAvatar!, isAvatar: true),
-                  .downloadMedia(
+              );
-                    .new(mxc: roomMetadata.avatar!, isAvatar: true),
+
-                  );
+        final pmp = notification.perMessageProfile;
+        final senderAvatarUrl = pmp?.avatar ?? notification.sender.avatar;
+        // Only Android can show the sender's avatar
+        final senderAvatar = senderAvatarUrl == null || !Platform.isAndroid
+            ? null
+            : await client.downloadMedia(
+                .new(mxc: senderAvatarUrl, isAvatar: true),
+              );
 
         await ref
             .read(NotificationController.provider.notifier)
             .send(
-              id: event.eventId.hashCode & 0x7fffffff,
+              // Android stacks messages into one conversation per room
-              title: roomMetadata.name ?? "New Event",
+              id:
+                  (Platform.isAndroid
+                          ? notification.roomId
+                          : notification.eventId)
+                      .hashCode &
+                  0x7fffffff,
+              title: notification.roomName,
               icon: icon,
-              payload: event.rowId.toString(),
+              payload: notification.eventRowId.toString(),
-              body: switch (event.content) {
+              body: notification.text,
-                MessageContent(:final body?) ||
+              senderName: pmp?.name ?? notification.sender.name,
-                StickerContent(:final body) => body,
+              senderAvatar: senderAvatar,
-                _ => null,
+              selfName: notification.self.name,
-              },
+              isGroup: !notification.isDm,
+              sound: notification.sound,
+              timestamp: notification.timestamp,
+              threadId: notification.roomId,
             );
 
         if (isInBackground) exit(0);
@@ -125,9 +140,11 @@ class UnifiedPushController extends AsyncNotifier<String?> {
       onUnregistered: deregister,
     );
 
-    if (!registered) return null;
+    if (!registered || isInBackground) return null;
 
     try {
+      if (await deregisterIfDisabled()) return null;
+
       return await register();
     } catch (error, stackTrace) {
       showError(error, stackTrace);
@@ -146,19 +163,9 @@ class UnifiedPushController extends AsyncNotifier<String?> {
 
     state = .loading();
     try {
-      final deviceIdCompleter = Completer<String>();
+      final deviceId = await ref
-      final subscription = ref.listen(
+          .read(GomuksListenerController.provider.notifier)
-        ClientStateController.provider.select((value) => value?.deviceId),
+          .deviceId();
-        (_, next) {
-          if (next != null && !deviceIdCompleter.isCompleted) {
-            deviceIdCompleter.complete(next);
-          }
-        },
-        fireImmediately: true,
-      );
-      final deviceId = await deviceIdCompleter.future.whenComplete(
-        subscription.close,
-      );
 
       await Future(() async {
         final capabilities = await ref
@@ -204,12 +211,27 @@ class UnifiedPushController extends AsyncNotifier<String?> {
     }
   }
 
-  Future<void> deregister([String? instance]) async {
+  Future<bool> deregisterIfDisabled([String? notificationInstance]) async {
-    final clientState = ref.read(ClientStateController.provider);
+    if (await ref
+        .read(NotificationController.provider.notifier)
+        .permissionsGranted()) {
+      return false;
+    }
 
-    final keyProvider = PushKeyController.provider(
+    final instance =
-      instance ?? clientState!.deviceId!,
+        notificationInstance ??
-    );
+        await ref.read(GomuksListenerController.provider.notifier).deviceId();
+    final key = await ref.read(PushKeyController.provider(instance).future);
+    if (key != null) await deregister(instance);
+    return true;
+  }
+
+  Future<void> deregister([String? instance]) async {
+    instance ??= await ref
+        .read(GomuksListenerController.provider.notifier)
+        .deviceId();
+
+    final keyProvider = PushKeyController.provider(instance);
     final key = await ref.read(keyProvider.future);
 
     if (key != null) {
@@ -223,7 +245,7 @@ class UnifiedPushController extends AsyncNotifier<String?> {
       );
     }
 
-    await UnifiedPush.unregister(instance ?? clientState!.deviceId!);
+    await UnifiedPush.unregister(instance);
     state = .data(null);
   }
 

lib/helpers/extensions/save_attachment.dart

@@ -0,0 +1,34 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:material_ui/material_ui.dart";
+import "package:nexus/controllers/client.dart";
+import "package:nexus/helpers/extensions/show_error_snack_bar.dart";
+import "package:nexus/helpers/extensions/with_progress_snackbar.dart";
+import "package:nexus/helpers/file_dialog_helper.dart";
+
+extension SaveAttachment on BuildContext {
+  /// Downloads the media at [mxc], displaying a snackbar whilst it's donwnloading,
+  /// then lets the user pick where to save it, suggesting [filename].
+  Future<void> saveAttachment(
+    WidgetRef ref,
+    Uri mxc, {
+    required bool encrypted,
+    String? filename,
+  }) async {
+    final file = await withProgressSnackbar(
+      "Downloading file...",
+      () => ref
+          .read(ClientController.provider.notifier)
+          .downloadMedia(.new(mxc: mxc, encrypted: encrypted)),
+    );
+    if (file == null || !mounted) return;
+
+    final messenger = ScaffoldMessenger.of(this);
+    try {
+      await ref
+          .read(FileDialogHelper.provider)
+          .saveFile(file, filename ?? mxc.pathSegments.last);
+    } catch (error) {
+      messenger.showErrorSnackBar(error.toString());
+    }
+  }
+}

lib/helpers/file_dialog_helper.dart

@@ -0,0 +1,93 @@
+import "dart:io";
+
+import "package:file_selector/file_selector.dart";
+import "package:flutter_file_dialog/flutter_file_dialog.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:mime/mime.dart";
+import "package:nexus/controllers/image_picker.dart";
+import "package:nexus/controllers/portal.dart";
+import "package:xdg_desktop_portal/xdg_desktop_portal.dart";
+
+class FileDialogHelper(final Ref ref) {
+  Future<bool> saveFile(File file, String filename) async {
+    final mimeType = lookupMimeType(
+      file.path,
+      headerBytes: await file
+          .openRead(0, defaultMagicNumbersMaxLength)
+          .expand((bytes) => bytes)
+          .toList(),
+    );
+
+    final filenameWithExtension = mimeType == null
+        ? filename
+        : "$filename.${extensionFromMime(mimeType)}";
+
+    if (Platform.isAndroid || Platform.isIOS) {
+      return await FlutterFileDialog.saveFile(
+            params: .new(
+              sourceFilePath: file.path,
+              fileName: filenameWithExtension,
+            ),
+          ) !=
+          null;
+    }
+
+    final destination = Platform.isLinux
+        ? await getLinuxSaveLocation(filenameWithExtension)
+        : (await getSaveLocation(suggestedName: filenameWithExtension))?.path;
+    if (destination == null) return false;
+
+    await file.copy(destination);
+    return true;
+  }
+
+  Future<String?> getLinuxSaveLocation(String filename) async {
+    final portal = await ref.read(PortalController.provider.future);
+
+    try {
+      final result = await portal.fileChooser
+          .saveFile(title: "Save file", currentName: filename)
+          .first;
+
+      return switch (result.uris.firstOrNull) {
+        final uri? => Uri.parse(uri).toFilePath(),
+        null => null,
+      };
+    } on XdgPortalRequestCancelledException catch (_) {
+      return null;
+    }
+  }
+
+  /// Lets the user pick a file, or only images if [images] is true. Returns
+  /// null if the user cancelled.
+  Future<XFile?> pickFile({bool images = false}) async {
+    if (!Platform.isLinux) {
+      return images
+          ? ref.read(ImagePickerController.provider).pickImage(source: .gallery)
+          : openFile();
+    }
+
+    final portal = await ref.read(PortalController.provider.future);
+
+    try {
+      final result = await portal.fileChooser
+          .openFile(
+            title: images ? "Pick image" : "Pick file",
+            filters: [
+              if (images)
+                .new("Images", [XdgFileChooserMimeTypePattern("image/*")]),
+            ],
+          )
+          .first;
+
+      return switch (result.uris.firstOrNull) {
+        final uri? => XFile(Uri.parse(uri).toFilePath()),
+        null => null,
+      };
+    } on XdgPortalRequestCancelledException catch (_) {
+      return null;
+    }
+  }
+
+  static final provider = Provider<FileDialogHelper>(FileDialogHelper.new);
+}

lib/helpers/mxc_image.dart

@@ -1,5 +1,9 @@
-import "dart:ui";
+import "dart:async";
+import "dart:io";
+import "dart:isolate";
+import "dart:ui" as ui;
 
+import "package:avif_native/avif_native.dart";
 import "package:flutter/widgets.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/controllers/client.dart";
@@ -15,13 +19,19 @@ class MxcImage(final WidgetRef ref, final DownloadMediaRequest request)
   ImageStreamCompleter loadImage(MxcImage key, ImageDecoderCallback decode) =>
       MultiFrameImageStreamCompleter(codec: _loadAsync(decode), scale: 1.0);
 
-  Future<Codec> _loadAsync(ImageDecoderCallback decode) async {
+  Future<ui.Codec> _loadAsync(ImageDecoderCallback decode) async {
     final file = await ref
         .read(ClientController.provider.notifier)
         .downloadMedia(request);
-    final buffer = await ImmutableBuffer.fromFilePath(file.path);
+    final bytes = await File(file.path).readAsBytes();
 
-    return decode(buffer);
+    // Flutter can't decode AVIF on Linux/Windows (or older Android/iOS), so we do it ourselves
+    if (String.fromCharCodes(bytes.skip(4).take(8))
+        case "ftypavif" || "ftypavis") {
+      return AvifCodec(await Isolate.run(() => decodeAvif(bytes)));
+    }
+
+    return decode(await .fromUint8List(bytes));
   }
 
   @override
@@ -31,3 +41,37 @@ class MxcImage(final WidgetRef ref, final DownloadMediaRequest request)
   @override
   int get hashCode => request.hashCode;
 }
+
+class AvifCodec(final AvifImageData data) implements ui.Codec {
+  var _frameIndex = 0;
+
+  @override
+  int get frameCount => data.frames.length;
+
+  // libavif uses -2 for unknown, which we treat as infinite like browsers do
+  @override
+  int get repetitionCount =>
+      data.repetitionCount < 0 ? -1 : data.repetitionCount;
+
+  @override
+  Future<ui.FrameInfo> getNextFrame() {
+    final frame = data.frames[_frameIndex++ % frameCount];
+    final completer = Completer<ui.FrameInfo>();
+    ui.decodeImageFromPixels(
+      frame.rgba,
+      frame.width,
+      frame.height,
+      .rgba8888,
+      (image) => completer.complete(AvifFrameInfo(frame.duration, image)),
+    );
+    return completer.future;
+  }
+
+  @override
+  void dispose() {}
+}
+
+class AvifFrameInfo(
+  @override final Duration duration,
+  @override final ui.Image image,
+) implements ui.FrameInfo;

lib/models/events_decrypted.dart

@@ -0,0 +1,23 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/epoch_date_time_converter.dart";
+import "package:nexus/models/event.dart";
+import "package:nexus/models/room.dart";
+
+part "events_decrypted.freezed.dart";
+part "events_decrypted.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(createToJson: false)
+class const EventsDecrypted({
+  required final String roomId,
+  @JsonKey(name: "preview_event_rowid") final int? previewEventRowID,
+  @EpochDateTimeConverter() final DateTime? sortingTimestamp,
+
+  /// [events] is an IMap of eventRowId to event
+  @JsonKey(fromJson: Room.eventsJsonToIMap)
+  required final IMap<int, Event> events,
+}) with _$EventsDecrypted {
+  factory EventsDecrypted.fromJson(Map<String, Object?> json) =>
+      _$EventsDecryptedFromJson(json);
+}

lib/models/push_notification.dart

@@ -0,0 +1,44 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/epoch_date_time_converter.dart";
+
+part "push_notification.freezed.dart";
+part "push_notification.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(createToJson: false)
+class const PushNotification({
+  @EpochDateTimeConverter() required final DateTime timestamp,
+
+  required final String eventId,
+  @JsonKey(name: "event_rowid") required final int eventRowId,
+
+  required final String roomId,
+  required final String roomName,
+  final Uri? roomAvatar,
+  final bool isDm = false,
+
+  required final NotificationUser sender,
+  required final NotificationUser self,
+  final NotificationUser? perMessageProfile,
+
+  required final String text,
+  final Uri? image,
+
+  final bool mention = false,
+  final bool reply = false,
+  final bool sound = false,
+}) with _$PushNotification {
+  factory PushNotification.fromJson(Map<String, Object?> json) =>
+      _$PushNotificationFromJson(json);
+}
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(createToJson: false)
+class const NotificationUser({
+  required final String id,
+  required final String name,
+  final Uri? avatar,
+}) with _$NotificationUser {
+  factory NotificationUser.fromJson(Map<String, Object?> json) =>
+      _$NotificationUserFromJson(json);
+}

lib/models/requests/register_pusher.dart

@@ -13,8 +13,6 @@ class const RegisterPusherRequest({
   required final String deviceDisplayName,
   required final PusherKind kind,
   required final String lang,
-
-  /// TODO: What does this do?
   final String? profileTag,
 
   @JsonKey(name: "pushkey") required final String pushKey,

lib/models/settings.dart

@@ -13,6 +13,7 @@ class const Settings({
   final bool linuxMobileMode = false,
   final bool showAllInHome = false,
   final bool showMinimizeButton = false,
+  final bool swipeToReply = false,
   final RoomOrder roomOrder = .unreadFirst,
 }) with _$Settings {
   Map<String, Object?> toJson() => _$SettingsToJson(this);

lib/widgets/composer/composer.dart

@@ -1,7 +1,6 @@
 import "dart:io";
 
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
-import "package:file_selector/file_selector.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/widgets/emoji_picker.dart";
 import "package:nexus/helpers/extensions/show_adaptive_sheet.dart";
@@ -13,6 +12,7 @@ import "package:fluttertagger/fluttertagger.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:nexus/controllers/attachment.dart";
 import "package:nexus/controllers/image_picker.dart";
+import "package:nexus/helpers/file_dialog_helper.dart";
 import "package:image_picker/image_picker.dart";
 import "package:nexus/controllers/power_level.dart";
 import "package:nexus/models/content/message.dart";
@@ -245,14 +245,24 @@ class const Composer(
                                       leading: Icon(icon),
                                     ),
                                     onTap: () => attach(
-                                      ref
+                                      source == .gallery
-                                          .read(ImagePickerController.provider)
+                                          ? ref
-                                          .pickImage(source: source),
+                                                .read(FileDialogHelper.provider)
+                                                .pickFile(images: true)
+                                          : ref
+                                                .read(
+                                                  ImagePickerController
+                                                      .provider,
+                                                )
+                                                .pickImage(source: source),
                                     ).onError(showError),
                                   ),
                                 PopupMenuItem(
-                                  onTap: () =>
+                                  onTap: () => attach(
-                                      attach(openFile()).onError(showError),
+                                    ref
+                                        .read(FileDialogHelper.provider)
+                                        .pickFile(),
+                                  ).onError(showError),
                                   child: ListTile(
                                     title: Text("Files"),
                                     leading: Icon(Icons.attachment),

lib/widgets/expandable_image.dart

@@ -1,6 +1,7 @@
 import "package:material_ui/material_ui.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:m3e_buttons/m3e_buttons.dart";
+import "package:nexus/helpers/extensions/save_attachment.dart";
 import "package:nexus/helpers/mxc_image.dart";
 import "package:nexus/models/requests/download_media.dart";
 import "package:nexus/widgets/error_dialog.dart";
@@ -8,6 +9,9 @@ import "package:nexus/widgets/error_dialog.dart";
 final class const ExpandableImage(
   final DownloadMediaRequest? request, {
   required final Widget child,
+
+  /// If set, a download button is shown, suggesting this filename
+  final String? downloadFilename,
   super.key,
 }) extends ConsumerWidget {
   @override
@@ -38,9 +42,25 @@ final class const ExpandableImage(
                     alignment: .topRight,
                     child: Padding(
                       padding: .all(32),
-                      child: M3EButton(
+                      child: Row(
-                        onPressed: Navigator.of(context).pop,
+                        mainAxisSize: .min,
-                        child: Icon(Icons.close),
+                        spacing: 8,
+                        children: [
+                          if (downloadFilename != null)
+                            M3EButton(
+                              onPressed: () => context.saveAttachment(
+                                ref,
+                                request!.mxc,
+                                encrypted: request!.encrypted,
+                                filename: downloadFilename,
+                              ),
+                              child: Icon(Icons.download),
+                            ),
+                          M3EButton(
+                            onPressed: Navigator.of(context).pop,
+                            child: Icon(Icons.close),
+                          ),
+                        ],
                       ),
                     ),
                   ),

lib/widgets/file_card.dart

@@ -1,4 +1,6 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/extensions/save_attachment.dart";
 import "package:nexus/helpers/extensions/size_to_string.dart";
 import "package:nexus/models/info/file.dart";
 
@@ -6,10 +8,11 @@ final class const FileCard(
   final Uri uri,
   final FileInfo? info, {
   final String? filename,
+  final bool encrypted = false,
   super.key,
-}) extends StatelessWidget {
+}) extends ConsumerWidget {
   @override
-  Widget build(BuildContext context) => SizedBox(
+  Widget build(BuildContext context, WidgetRef ref) => SizedBox(
     width: 320,
     child: Card(
       color: Theme.of(context).colorScheme.surfaceContainer,
@@ -17,8 +20,15 @@ final class const FileCard(
         leading: Icon(Icons.file_copy),
         title: Text(filename ?? "file", maxLines: 1, overflow: .ellipsis),
         subtitle: info?.size == null ? null : Text(info!.size!.sizeAsString),
-        // TODO: Downloading files
+        trailing: IconButton(
-        trailing: IconButton(onPressed: null, icon: Icon(Icons.download)),
+          onPressed: () => context.saveAttachment(
+            ref,
+            uri,
+            encrypted: encrypted,
+            filename: filename,
+          ),
+          icon: Icon(Icons.download),
+        ),
       ),
     ),
   );

lib/widgets/html/html.dart

@@ -79,6 +79,7 @@ class const Html(
                   alignment: PlaceholderAlignment.middle,
                   child: ExpandableImage(
                     .new(mxc: src),
+                    downloadFilename: src.pathSegments.last,
                     child: Image(
                       image: MxcImage(ref, .new(mxc: src)),
                       errorBuilder: (_, error, _) => Text(

lib/widgets/html/mention_chip.dart

@@ -43,7 +43,6 @@ class const MentionChip(final String content, final String? roomId, {super.key})
               if (data case MembershipContent membership) {
                 context.showUserPopover(membership, mention, roomId: roomId);
               } else if (data case RoomSummary summary) {
-                // TODO: This is an extra call that isn't truly needed, get rid of it
                 final eventRowId = linkInfo?.eventId == null
                     ? null
                     : await ref

lib/widgets/message_image.dart

@@ -11,6 +11,7 @@ final class const MessageImage(
   final Uri url, {
   final i.ImageInfo? info,
   required final bool encrypted,
+  final String? filename,
   super.key,
 }) extends ConsumerWidget {
   @override
@@ -18,6 +19,7 @@ final class const MessageImage(
     final request = DownloadMediaRequest(mxc: url, encrypted: encrypted);
     return ExpandableImage(
       request,
+      downloadFilename: filename,
       child: ClipRRect(
         borderRadius: .all(.circular(8)),
         child: AspectRatio(

lib/widgets/pages/chat.dart

@@ -2,7 +2,7 @@ import "package:flutter_hooks/flutter_hooks.dart";
 import "package:material_ui/material_ui.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:nexus/controllers/init_complete.dart";
-import "package:nexus/controllers/key.dart";
+import "package:nexus/controllers/selected_room.dart";
 import "package:nexus/controllers/notification_request.dart";
 import "package:nexus/helpers/extensions/is_desktop.dart";
 import "package:nexus/widgets/appbar.dart";
@@ -37,42 +37,46 @@ class const ChatPage({super.key}) extends HookConsumerWidget {
       builder: (context, constraints) {
         final isDesktop = context.isDesktop;
         final showMembersByDefault = constraints.maxWidth > 1000;
-        final roomId = ref
+        final roomId = ref.watch(SelectedRoomController.provider);
-            .watch(KeyController.provider(KeyController.roomKey))
-            .requireValue;
 
-        return SafeArea(
+        return PopScope(
-          child: Scaffold(
+          canPop: false,
-            key: scaffoldKey,
+          onPopInvokedWithResult: (didPop, _) {
-            appBar: initComplete ? null : Appbar(),
+            if (!didPop) scaffoldKey.currentState?.openDrawer();
-            body: initComplete
+          },
-                ? Row(
+          child: SafeArea(
-                    children: [
+            child: Scaffold(
-                      if (isDesktop) Sidebar(),
+              key: scaffoldKey,
-                      Expanded(
+              appBar: initComplete ? null : Appbar(),
-                        child: RoomChat(
+              body: initComplete
-                          key: ValueKey(roomId),
+                  ? Row(
-                          roomId: roomId,
+                      children: [
-                          isDesktop: isDesktop,
+                        if (isDesktop) Sidebar(),
-                          showMembersByDefault: showMembersByDefault,
+                        Expanded(
-                        ),
+                          child: RoomChat(
-                      ),
+                            key: ValueKey(roomId),
-                    ],
+                            roomId: roomId,
-                  )
+                            isDesktop: isDesktop,
-                : Column(
+                            showMembersByDefault: showMembersByDefault,
-                    children: [
-                      const SyncStatusBanner(),
-                      Expanded(
-                        child: Center(
-                          child: Column(
-                            mainAxisSize: .min,
-                            children: [Loading(), Text("Syncing...")],
                           ),
                         ),
-                      ),
+                      ],
-                    ],
+                    )
-                  ),
+                  : Column(
-            drawer: isDesktop || !initComplete ? null : Sidebar(),
+                      children: [
+                        const SyncStatusBanner(),
+                        Expanded(
+                          child: Center(
+                            child: Column(
+                              mainAxisSize: .min,
+                              children: [Loading(), Text("Syncing...")],
+                            ),
+                          ),
+                        ),
+                      ],
+                    ),
+              drawer: isDesktop || !initComplete ? null : Sidebar(),
+            ),
           ),
         );
       },

lib/widgets/players/audio.dart

@@ -5,6 +5,7 @@ import "package:flutter_hooks/flutter_hooks.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:media_kit/media_kit.dart";
 import "package:nexus/controllers/client.dart";
+import "package:nexus/helpers/extensions/save_attachment.dart";
 import "package:nexus/models/info/audio.dart";
 import "package:nexus/widgets/players/player_controls.dart";
 
@@ -12,6 +13,7 @@ class const AudioPlayer(
   final Uri uri,
   final AudioInfo? info, {
   final bool encrypted = false,
+  final String? filename,
   super.key,
 }) extends HookConsumerWidget {
   @override
@@ -38,8 +40,24 @@ class const AudioPlayer(
       child: Card(
         color: Theme.of(context).colorScheme.surfaceContainer,
         child: Padding(
-          padding: .only(left: 8, right: 16),
+          padding: .symmetric(horizontal: 8),
-          child: PlayerControls(player, loading: !loaded.value),
+          child: PlayerControls(
+            player,
+            loading: !loaded.value,
+            actions: .new([
+              SizedBox(width: 4),
+              IconButton(
+                onPressed: () => context.saveAttachment(
+                  ref,
+                  uri,
+                  encrypted: encrypted,
+                  filename: filename,
+                ),
+                tooltip: "Download",
+                icon: Icon(Icons.download),
+              ),
+            ]),
+          ),
         ),
       ),
     );

lib/widgets/players/video.dart

@@ -3,6 +3,7 @@ import "dart:async";
 import "package:material_ui/material_ui.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:nexus/controllers/client.dart";
+import "package:nexus/helpers/extensions/save_attachment.dart";
 import "package:nexus/models/info/video.dart";
 import "package:flutter_hooks/flutter_hooks.dart";
 import "package:media_kit/media_kit.dart";
@@ -13,6 +14,7 @@ class const VideoPlayer(
   final Uri uri,
   final VideoInfo? info, {
   final bool encrypted = false,
+  final String? filename,
   super.key,
 }) extends HookConsumerWidget {
   @override
@@ -61,6 +63,24 @@ class const VideoPlayer(
                           onTap: loaded.value ? player.playOrPause : null,
                         ),
                       ),
+                      Positioned(
+                        top: 4,
+                        right: 4,
+                        child: IconButton(
+                          onPressed: () => context.saveAttachment(
+                            ref,
+                            uri,
+                            encrypted: encrypted,
+                            filename: filename,
+                          ),
+                          color: Colors.white,
+                          style: IconButton.styleFrom(
+                            backgroundColor: Colors.black38,
+                          ),
+                          tooltip: "Download",
+                          icon: Icon(Icons.download),
+                        ),
+                      ),
                       Positioned(
                         left: 0,
                         right: 0,

lib/widgets/reaction_row.dart

@@ -53,6 +53,12 @@ class const ReactionRow(final Event event, {super.key}) extends ConsumerWidget {
                                         ref,
                                         .new(mxc: Uri.parse(reaction)),
                                       ),
+                                      errorBuilder: (context, _, _) => Icon(
+                                        Icons.broken_image,
+                                        color: Theme.of(context)
+                                            .colorScheme
+                                            .error,
+                                      ),
                                     )
                                   : Text(reaction, overflow: .ellipsis),
                             ),

lib/widgets/renderers/event.dart

@@ -29,6 +29,7 @@ import "package:nexus/widgets/renderers/message.dart";
 import "package:nexus/widgets/reaction_row.dart";
 import "package:nexus/widgets/renderers/membership.dart";
 import "package:nexus/widgets/renderers/generic_event.dart";
+import "package:nexus/widgets/swipe_to_reply.dart";
 import "package:nexus/widgets/timestamp.dart";
 
 class const EventRenderer(
@@ -39,6 +40,9 @@ class const EventRenderer(
   final int? maxLines,
   final JumpToEvent? jumpToEvent,
   final IList<PopupMenuEntry> Function(Event event)? getEventOptions,
+
+  /// If set, events can be swiped, calling this
+  final VoidCallback? onSwipe,
   super.key,
 }) extends HookConsumerWidget {
   @override
@@ -239,18 +243,21 @@ class const EventRenderer(
                   child: GestureDetector(
                     onSecondaryTapUp: contextMenuCallback,
                     onLongPressStart: contextMenuCallback,
-                    child: Padding(
+                    child: SwipeToReply(
-                      padding: EdgeInsets.symmetric(horizontal: 8)
+                      onSwipe: onSwipe,
-                          .copyWith(top: isGrouped ? 0 : 8),
+                      Padding(
-                      child: Wrap(
+                        padding: EdgeInsets.symmetric(horizontal: 8)
-                        verticalDirection: .up,
+                            .copyWith(top: isGrouped ? 0 : 8),
-                        spacing: 6,
+                        child: Wrap(
-                        crossAxisAlignment: .center,
+                          verticalDirection: .up,
-                        children: [
+                          spacing: 6,
-                          child,
+                          crossAxisAlignment: .center,
-                          if (child is! MessageRenderer)
+                          children: [
-                            Timestamp(event.timestamp),
+                            child,
-                        ],
+                            if (child is! MessageRenderer)
+                              Timestamp(event.timestamp),
+                          ],
+                        ),
                       ),
                     ),
                   ),

lib/widgets/renderers/message.dart

@@ -110,14 +110,53 @@ class const MessageRenderer(
                 ConstrainedBox(
                   constraints: .loose(.square(500)),
                   child: switch (event.content) {
-                    VideoMessageContent(:final info, :final file) =>
+                    VideoMessageContent(
-                      VideoPlayer(url, info, encrypted: file != null),
+                      :final info,
-                    AudioMessageContent(:final info, :final file) =>
+                      :final file,
-                      AudioPlayer(url, info, encrypted: file != null),
+                      :final filename,
-                    FileMessageContent(:final info, :final filename) =>
+                      :final body,
-                      FileCard(url, info, filename: filename),
+                    ) =>
-                    ImageMessageContent(:final info, :final file) =>
+                      VideoPlayer(
-                      MessageImage(url, info: info, encrypted: file != null),
+                        url,
+                        info,
+                        encrypted: file != null,
+                        filename: filename ?? body,
+                      ),
+                    AudioMessageContent(
+                      :final info,
+                      :final file,
+                      :final filename,
+                      :final body,
+                    ) =>
+                      AudioPlayer(
+                        url,
+                        info,
+                        encrypted: file != null,
+                        filename: filename ?? body,
+                      ),
+                    FileMessageContent(
+                      :final info,
+                      :final filename,
+                      :final file,
+                    ) =>
+                      FileCard(
+                        url,
+                        info,
+                        filename: filename,
+                        encrypted: file != null,
+                      ),
+                    ImageMessageContent(
+                      :final info,
+                      :final file,
+                      :final filename,
+                      :final body,
+                    ) =>
+                      MessageImage(
+                        url,
+                        info: info,
+                        encrypted: file != null,
+                        filename: filename ?? body,
+                      ),
                     _ => SizedBox.shrink(),
                   },
                 ),

lib/widgets/reset_encryption_sheet.dart

@@ -5,6 +5,7 @@ import "package:nexus/controllers/client.dart";
 import "package:nexus/controllers/client_state.dart";
 import "package:nexus/helpers/extensions/show_adaptive_sheet.dart";
 import "package:nexus/main.dart";
+import "package:nexus/models/client_state.dart";
 import "package:nexus/widgets/recovery_key_sheet.dart";
 import "package:nexus/widgets/sheet_layout.dart";
 
@@ -16,11 +17,12 @@ class const ResetEncryptionSheet({
 }) extends HookConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final isReset = ref.watch(
+    final verificationState = ref.watch(
       ClientStateController.provider.select(
-        (state) => state?.verificationState.hasCrossSigning ?? false,
+        (state) => state?.verificationState,
       ),
     );
+    final isReset = verificationState?.hasCrossSigning ?? false;
 
     final usePassphrase = useState(false);
     final passphraseController = useTextEditingController();
@@ -95,6 +97,13 @@ class const ResetEncryptionSheet({
         ),
       ],
       children: [
+        if (verificationState case VerificationState(
+          hasCrossSigning: true,
+          hasSecretStorage: false,
+        ))
+          const Text(
+            "Your account has an encryption identity, but no recovery key. If you're still signed in on another client, you can set up a recovery key there instead, then restart Nexus and use it to verify. Otherwise, continue with the reset:",
+          ),
         Text(
           isReset
               ? "This replaces your encryption identity with a new one. Your other sessions will need to be verified again, and any messages you can't currently decrypt may become unreadable."

lib/widgets/room_chat/chat_timeline.dart

@@ -13,6 +13,7 @@ class const ChatTimeline({
   required final IList<PopupMenuEntry> Function(Event) getEventOptions,
   required final int? highlightedEvent,
   required final double composerHeight,
+  final void Function(int rowId)? onSwipe,
   super.key,
 }) extends StatelessWidget {
   Widget eventRow(
@@ -26,6 +27,7 @@ class const ChatTimeline({
       roomId: roomId,
       jumpToEvent: jumpToEvent,
       getEventOptions: getEventOptions,
+      onSwipe: onSwipe == null ? null : () => onSwipe!(eventRowId),
     ),
     key: key,
     isHighlighted: highlightedEvent == eventRowId,

lib/widgets/room_chat/room_chat.dart

@@ -7,6 +7,8 @@ import "package:measure_size/measure_size.dart";
 import "package:nexus/controllers/client.dart";
 import "package:nexus/controllers/client_state.dart";
 import "package:nexus/controllers/member_list_opened.dart";
+import "package:nexus/controllers/power_level.dart";
+import "package:nexus/controllers/settings.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/room_chat.dart";
 import "package:nexus/helpers/hooks/chat_scroll.dart";
@@ -171,19 +173,30 @@ final class const RoomChat({
       return null;
     }, [jumpRowId]);
 
+    void onRelation(int rowId, RelationType type) {
+      relatedEvent.value = rowId;
+      relationType.value = type;
+      composerNode.requestFocus();
+    }
+
     IList<PopupMenuEntry> getEventOptions(Event event) =>
         event.buildEventOptions(
           context: context,
           ref: ref,
           roomId: roomId,
           userId: userId,
-          onRelation: (rowId, type) {
+          onRelation: onRelation,
-            relatedEvent.value = rowId;
-            relationType.value = type;
-            composerNode.requestFocus();
-          },
         );
 
+    final swipeToReply = ref.watch(
+      SettingsController.provider.select(
+        (settings) => settings.value?.swipeToReply ?? false,
+      ),
+    );
+    final canReply = ref.watch(
+      PowerLevelController.provider(.new(eventType: .message, roomId: roomId)),
+    );
+
     return Scaffold(
       endDrawer: PinnedEventsDrawer(
         roomId,
@@ -224,6 +237,9 @@ final class const RoomChat({
                                   roomId: roomId,
                                   jumpToEvent: jumpToEvent,
                                   getEventOptions: getEventOptions,
+                                  onSwipe: swipeToReply && canReply
+                                      ? (rowId) => onRelation(rowId, .reply)
+                                      : null,
                                   highlightedEvent: highlightedEvent.value,
                                   composerHeight: composerSize.value,
                                 ),

lib/widgets/room_list.dart

@@ -22,9 +22,10 @@ import "package:nexus/widgets/room_summary_sheet.dart";
 import "package:nexus/widgets/room_menu_button.dart";
 import "package:nexus/widgets/space_hierarchy_sheet.dart";
 import "package:nexus/controllers/key.dart";
+import "package:nexus/controllers/selected_room.dart";
+import "package:nexus/controllers/selected_space.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/spaces.dart";
-import "package:collection/collection.dart";
 
 // Needed for navigation_rail_m3e (#65).
 import "package:flutter/material.dart" as old_mat;
@@ -217,23 +218,8 @@ class const SpacesRail({super.key}) extends ConsumerWidget {
 class const RoomsPane({super.key}) extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final selectedSpaceId = ref.watch(
+    final selectedRoomId = ref.watch(SelectedRoomController.provider);
-      KeyController.provider(KeyController.spaceKey)
+    final selectedSpace = ref.watch(SelectedSpaceController.provider)!;
-          .select((async) => async.requireValue),
-    );
-    final selectedRoomId = ref.watch(
-      KeyController.provider(KeyController.roomKey)
-          .select((async) => async.requireValue),
-    );
-    final selectedSpace = ref.watch(
-      SpacesController.provider.select((async) {
-        final spaces = async.requireValue;
-        return spaces.firstWhereOrNull(
-              (space) => space.id == selectedSpaceId,
-            ) ??
-            spaces.first;
-      }),
-    );
     final isDm = selectedSpace.id == "dms";
     final spaceMetadata = selectedSpace.room?.metadata;
 

lib/widgets/room_summary_sheet.dart

@@ -30,6 +30,7 @@ class const RoomSummarySheet(
           if (summary.avatarUrl != null)
             ExpandableImage(
               summary.avatarUrl == null ? null : .new(mxc: summary.avatarUrl!),
+              downloadFilename: name,
               child: AvatarOrHash(
                 summary.avatarUrl,
                 "",

lib/widgets/settings/dialog_list_tile.dart

@@ -4,53 +4,35 @@ import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/widgets/settings/radio_sheet.dart";
 
 final class const DialogListTile<T>({
-  required final T? initialValue,
+  required final T? value,
   required final Icon icon,
   required final String title,
   required final List<T> options,
   required final void Function(T value)? onChanged,
   required final String Function(T option) getName,
   final Widget? subtitle,
-  final bool required = true,
   super.key,
 }) extends ConsumerWidget {
   @override
-  Widget build(BuildContext context, WidgetRef ref) => FormField(
+  Widget build(BuildContext context, WidgetRef ref) => ListTile(
-    validator: (value) =>
+    enabled: onChanged != null,
-        value == null && required == true ? "This field is required." : null,
+    onTap: () => context.showAdaptiveSheet(
-    initialValue: initialValue,
+      (context) => RadioSheet<T>(
-    builder: (field) => InputDecorator(
+        title: title,
-      decoration: InputDecoration(
+        getName: getName,
-        errorText: field.errorText,
+        onChanged: onChanged,
-        contentPadding: EdgeInsets.zero,
+        value: value,
-        enabledBorder: InputBorder.none,
+        options: options,
       ),
-      child: ListTile(
+    ),
-        enabled: onChanged != null,
+    title: Text(title),
-        onTap: () => context.showAdaptiveSheet(
+    subtitle: subtitle,
-          (context) => RadioSheet<T>(
+    leading: icon,
-            title: title,
+    trailing: Chip(
-            getName: getName,
+      label: Text(
-            onChanged: onChanged == null
+        value == null ? "None" : getName(value as T),
-                ? null
+        overflow: TextOverflow.ellipsis,
-                : (value) {
+        style: onChanged == null ? .new(color: Colors.grey) : null,
-                    field.didChange(value);
-                    onChanged!.call(value);
-                  },
-            value: field.value,
-            options: options,
-          ),
-        ),
-        title: Text(title),
-        subtitle: subtitle,
-        leading: icon,
-        trailing: Chip(
-          label: Text(
-            field.value == null ? "None" : getName(field.value as T),
-            overflow: TextOverflow.ellipsis,
-            style: onChanged == null ? .new(color: Colors.grey) : null,
-          ),
-        ),
       ),
     ),
   );

lib/widgets/space_hierarchy_sheet.dart

@@ -236,6 +236,8 @@ class const SpaceHierarchySheet(final String spaceId, {super.key})
                   if (space?.avatarUrl case final avatarUrl?)
                     ExpandableImage(
                       .new(mxc: avatarUrl),
+                      downloadFilename:
+                          space?.name ?? space?.canonicalAlias ?? spaceId,
                       child: AvatarOrHash(avatarUrl, "", dimension: 32),
                     ),
                   Expanded(

lib/widgets/swipe_to_reply.dart

@@ -0,0 +1,58 @@
+import "package:flutter/services.dart";
+import "package:flutter_hooks/flutter_hooks.dart";
+import "package:material_ui/material_ui.dart";
+
+class const SwipeToReply(
+  final Widget child, {
+  required final VoidCallback? onSwipe,
+  super.key,
+}) extends HookWidget {
+  static const maxDrag = 64.0;
+  static const threshold = 0.75;
+
+  @override
+  Widget build(BuildContext context) {
+    final controller = useAnimationController(duration: Durations.short4);
+    useListenable(controller);
+
+    if (onSwipe == null) return child;
+
+    final progress = controller.value;
+
+    return GestureDetector(
+      onHorizontalDragUpdate: (details) {
+        final previous = controller.value;
+        controller.value = previous + details.primaryDelta! / maxDrag;
+
+        if (previous < threshold && controller.value >= threshold) {
+          HapticFeedback.lightImpact();
+        }
+      },
+      onHorizontalDragEnd: (_) {
+        if (controller.value >= threshold) onSwipe!();
+        controller.animateBack(0, curve: Curves.easeOut);
+      },
+      onHorizontalDragCancel: () =>
+          controller.animateBack(0, curve: Curves.easeOut),
+      child: Stack(
+        alignment: .centerLeft,
+        children: [
+          Positioned(
+            left: 16,
+            child: Opacity(
+              opacity: (progress / threshold).clamp(0, 1),
+              child: Transform.scale(
+                scale: progress >= threshold ? 1 : 0.75,
+                child: const Icon(Icons.reply),
+              ),
+            ),
+          ),
+          Transform.translate(
+            offset: .new(progress * maxDrag, 0),
+            child: child,
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/user_bottom_sheet.dart

@@ -103,6 +103,7 @@ final class const UserBottomSheet(
 
             ExpandableImage(
               member.avatarUrl == null ? null : .new(mxc: member.avatarUrl!),
+              downloadFilename: member.displayName ?? userId.localpart,
               child: AvatarOrHash(
                 member.avatarUrl,
                 member.displayName ?? userId.localpart,

linux/nix/pkg/avif_native.nix

@@ -0,0 +1,49 @@
+# avif_native's build hook downloads its prebuilt library, which the sandbox
+# can't do, so bundle it and point the manifest at the local copy instead
+{
+  stdenv,
+  fetchurl,
+  jq,
+}:
+let
+  artifacts = {
+    x86_64-linux = {
+      arch = "x64";
+      sha256 = "252b064f8ff4f0f265bc44294d4a7ed703dd7199688942c272dd8aa8d3039d5a";
+    };
+    aarch64-linux = {
+      arch = "arm64";
+      sha256 = "cdcf17cfd18b9b0f965b72615ddf11246121114577dc570d0bba25964e56c726";
+    };
+  };
+  inherit (artifacts.${stdenv.hostPlatform.system}) arch sha256;
+  key = "linux-${arch}-decode-dav1d";
+in
+{ version, src, ... }:
+stdenv.mkDerivation {
+  pname = "avif_native";
+  inherit version src;
+  inherit (src) passthru;
+
+  nativeBuildInputs = [ jq ];
+
+  library = fetchurl {
+    url = "https://github.com/Zhangw1998/avif_native/releases/download/native-v0.1.0/${key}-libavif_native.so.gz";
+    inherit sha256;
+  };
+
+  # The hook checksums the library, so it must stay byte-identical
+  dontFixup = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    cp -r . $out
+    chmod -R u+w $out
+    gunzip -c $library > $out/native/libavif_native.so
+    jq '.artifacts["${key}"].path = "libavif_native.so"' \
+      native/manifest.json > $out/native/manifest.json
+
+    runHook postInstall
+  '';
+}

linux/nix/pkg/default.nix

@@ -12,7 +12,7 @@
 
 flutter.buildFlutterApplication {
   pname = "nexus";
-  version = "1.0.0-alpha2";
+  version = "1.0.0-alpha4";
   inherit src;
 
   preBuild = ''
@@ -34,6 +34,8 @@ flutter.buildFlutterApplication {
 
   autoPubspecLock = src + "/pubspec.lock";
 
+  customSourceBuilders.avif_native = callPackage ./avif_native.nix { };
+
   gitHashes = {
     linkify = "sha256-TpMD6+0zyY6i9l+6d8ErnVufmepCv362rCtnbOht/z4=";
     fab_m3e = "sha256-5V9m6yY0jimx2gh7lQHYg4HDKQ4Wrl0ATmBhw5DkQMI=";

linux/nix/pkg/gomuks.nix

@@ -17,7 +17,7 @@ buildGoModule (
 
     src = "${src}/gomuks";
 
-    vendorHash = "sha256-+0iFK2ribhiNskXgPz7vslncuOgPMB/ZmFSfDOcz6ww=";
+    vendorHash = "sha256-nd0NEKXscgrFE/gBEW2aP+YeZNTOdbRa4QDLTRwIAZU=";
 
     buildPhase = ''
       runHook preBuild

pubspec.lock

@@ -105,6 +105,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.13.1"
+  avif_native:
+    dependency: "direct main"
+    description:
+      name: avif_native
+      sha256: "0a374a7ddc6e48d671792bd33efd9f46f199389cdcd42561210bd886facbc62e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -455,6 +463,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.1"
+  flutter_file_dialog:
+    dependency: "direct main"
+    description:
+      name: flutter_file_dialog
+      sha256: "5d270d69b6a5fdf45bdb88ebcf590e073dd89dfb45526ac83a64524ba57303b5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.3"
   flutter_hooks:
     dependency: "direct main"
     description:
@@ -985,7 +1001,7 @@ packages:
     source: hosted
     version: "1.19.0"
   mime:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: mime
       sha256: bd47de35f07e27267e69c8c8b22edf9473bfee170a60d60fcc93730c5144b7f6

pubspec.yaml

@@ -1,6 +1,6 @@
 name: nexus
 description: "A simple and user-friendly Matrix client"
-version: 1.0.0-alpha2
+version: 1.0.0-alpha4
 publish_to: none
 
 flutter:
@@ -107,7 +107,9 @@ dependencies:
             url: https://github.com/Henry-Hiles/xdg_desktop_portal.dart
             ref: quad/nexus
     pasteboard: 0.5.0
-
+    flutter_file_dialog: 3.3.3
+    mime: 2.1.0
+    avif_native: 0.1.1
 dev_dependencies:
     build_runner: 2.16.2
     flutter_lints: 6.0.0
@@ -131,3 +133,8 @@ flutter_launcher_icons:
     macos:
         generate: true
         image_path: assets/mobile.png
+
+hooks:
+    user_defines:
+        avif_native:
+            features: decode