refactor: Make most of the utils null safe

lib/utils/account_bundles.dart

@@ -1,8 +1,10 @@
+//@dart=2.12
+
 import 'package:matrix/matrix.dart';
 
 class AccountBundles {
-  String prefix;
-  List<AccountBundle> bundles;
+  String? prefix;
+  List<AccountBundle>? bundles;
 
   AccountBundles({this.prefix, this.bundles});
 
@@ -23,13 +25,14 @@ class AccountBundles {
 
   Map<String, dynamic> toJson() => {
         if (prefix != null) 'prefix': prefix,
-        if (bundles != null) 'bundles': bundles.map((v) => v.toJson()).toList(),
+        if (bundles != null)
+          'bundles': bundles!.map((v) => v.toJson()).toList(),
       };
 }
 
 class AccountBundle {
-  String name;
-  int priority;
+  String? name;
+  int? priority;
 
   AccountBundle({this.name, this.priority});
 
@@ -47,9 +50,9 @@ const accountBundlesType = 'im.fluffychat.account_bundles';
 
 extension AccountBundlesExtension on Client {
   List<AccountBundle> get accountBundles {
-    List<AccountBundle> ret;
+    List<AccountBundle>? ret;
     if (accountData.containsKey(accountBundlesType)) {
-      ret = AccountBundles.fromJson(accountData[accountBundlesType].content)
+      ret = AccountBundles.fromJson(accountData[accountBundlesType]!.content)
           .bundles;
     }
     ret ??= [];
@@ -62,12 +65,12 @@ extension AccountBundlesExtension on Client {
     return ret;
   }
 
-  Future<void> setAccountBundle(String name, [int priority]) async {
+  Future<void> setAccountBundle(String name, [int? priority]) async {
     final data =
         AccountBundles.fromJson(accountData[accountBundlesType]?.content ?? {});
     var foundBundle = false;
-    data.bundles ??= [];
-    for (final bundle in data.bundles) {
+    final bundles = data.bundles ??= [];
+    for (final bundle in bundles) {
       if (bundle.name == name) {
         bundle.priority = priority;
         foundBundle = true;
@@ -75,9 +78,9 @@ extension AccountBundlesExtension on Client {
       }
     }
     if (!foundBundle) {
-      data.bundles.add(AccountBundle(name: name, priority: priority));
+      bundles.add(AccountBundle(name: name, priority: priority));
     }
-    await setAccountData(userID, accountBundlesType, data.toJson());
+    await setAccountData(userID!, accountBundlesType, data.toJson());
   }
 
   Future<void> removeFromAccountBundle(String name) async {
@@ -85,15 +88,15 @@ extension AccountBundlesExtension on Client {
       return; // nothing to do
     }
     final data =
-        AccountBundles.fromJson(accountData[accountBundlesType].content);
+        AccountBundles.fromJson(accountData[accountBundlesType]!.content);
     if (data.bundles == null) return;
-    data.bundles.removeWhere((b) => b.name == name);
-    await setAccountData(userID, accountBundlesType, data.toJson());
+    data.bundles!.removeWhere((b) => b.name == name);
+    await setAccountData(userID!, accountBundlesType, data.toJson());
   }
 
   String get sendPrefix {
     final data =
         AccountBundles.fromJson(accountData[accountBundlesType]?.content ?? {});
-    return data.prefix;
+    return data.prefix!;
   }
 }

lib/utils/beautify_string_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 extension BeautifyStringExtension on String {
   String get beautified {
     var beautifiedStr = '';

lib/utils/custom_scroll_behaviour.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 

lib/utils/date_time_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -61,25 +63,25 @@ extension DateTimeExtension on DateTime {
     } else if (sameWeek) {
       switch (weekday) {
         case 1:
-          return L10n.of(context).monday;
+          return L10n.of(context)!.monday;
         case 2:
-          return L10n.of(context).tuesday;
+          return L10n.of(context)!.tuesday;
         case 3:
-          return L10n.of(context).wednesday;
+          return L10n.of(context)!.wednesday;
         case 4:
-          return L10n.of(context).thursday;
+          return L10n.of(context)!.thursday;
         case 5:
-          return L10n.of(context).friday;
+          return L10n.of(context)!.friday;
         case 6:
-          return L10n.of(context).saturday;
+          return L10n.of(context)!.saturday;
         case 7:
-          return L10n.of(context).sunday;
+          return L10n.of(context)!.sunday;
       }
     } else if (sameYear) {
-      return L10n.of(context).dateWithoutYear(
+      return L10n.of(context)!.dateWithoutYear(
           month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
     }
-    return L10n.of(context).dateWithYear(year.toString(),
+    return L10n.of(context)!.dateWithYear(year.toString(),
         month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
   }
 
@@ -94,7 +96,7 @@ extension DateTimeExtension on DateTime {
     final sameDay = sameYear && now.month == month && now.day == day;
 
     if (sameDay) return localizedTimeOfDay(context);
-    return L10n.of(context).dateAndTimeOfDay(
+    return L10n.of(context)!.dateAndTimeOfDay(
         localizedTimeShort(context), localizedTimeOfDay(context));
   }
 

lib/utils/fluffy_share.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
@@ -15,7 +17,7 @@ abstract class FluffyShare {
       ClipboardData(text: text),
     );
     ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(L10n.of(context).copiedToClipboard)));
+        SnackBar(content: Text(L10n.of(context)!.copiedToClipboard)));
     return;
   }
 }

lib/utils/get_client_secret.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:math';
 
 const _chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';

lib/utils/localized_exception_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:io';
 
 import 'package:flutter/material.dart';
@@ -12,9 +14,9 @@ extension LocalizedExceptionExtension on Object {
     if (this is MatrixException) {
       switch ((this as MatrixException).error) {
         case MatrixError.M_FORBIDDEN:
-          return L10n.of(context).noPermission;
+          return L10n.of(context)!.noPermission;
         case MatrixError.M_LIMIT_EXCEEDED:
-          return L10n.of(context).tooManyRequestsWarning;
+          return L10n.of(context)!.tooManyRequestsWarning;
         default:
           return (this as MatrixException).errorMessage;
       }
@@ -30,7 +32,7 @@ extension LocalizedExceptionExtension on Object {
           .toString()
           .replaceAll('{', '"')
           .replaceAll('}', '"');
-      return L10n.of(context)
+      return L10n.of(context)!
           .badServerVersionsException(serverVersions, supportedVersions);
     }
     if (this is BadServerLoginTypesException) {
@@ -44,15 +46,15 @@ extension LocalizedExceptionExtension on Object {
           .toString()
           .replaceAll('{', '"')
           .replaceAll('}', '"');
-      return L10n.of(context)
+      return L10n.of(context)!
           .badServerLoginTypesException(serverVersions, supportedVersions);
     }
     if (this is MatrixConnectionException || this is SocketException) {
-      return L10n.of(context).noConnectionToTheServer;
+      return L10n.of(context)!.noConnectionToTheServer;
     }
     if (this is String) return toString();
     if (this is UiaException) return toString();
     Logs().w('Something went wrong: ', this);
-    return L10n.of(context).oopsSomethingWentWrong;
+    return L10n.of(context)!.oopsSomethingWentWrong;
   }
 }

lib/utils/matrix_sdk_extensions.dart/client_presence_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:matrix/matrix.dart';
 
 extension ClientPresenceExtension on Client {

lib/utils/matrix_sdk_extensions.dart/device_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:matrix/matrix.dart';
@@ -31,14 +33,14 @@ IconData _getIconFromName(String displayname) {
 
 extension DeviceExtension on Device {
   String get displayname =>
-      (displayName?.isNotEmpty ?? false) ? displayName : 'Unknown device';
+      (displayName?.isNotEmpty ?? false) ? displayName! : 'Unknown device';
 
   IconData get icon => _getIconFromName(displayname);
 }
 
 extension DeviceKeysExtension on DeviceKeys {
   String get displayname => (deviceDisplayName?.isNotEmpty ?? false)
-      ? deviceDisplayName
+      ? deviceDisplayName!
       : 'Unknown device';
 
   IconData get icon => _getIconFromName(displayname);

lib/utils/matrix_sdk_extensions.dart/event_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
@@ -19,10 +21,10 @@ extension LocalizedBody on Event {
 
   bool get isAttachmentSmallEnough =>
       infoMap['size'] is int &&
-      infoMap['size'] < room.client.database.maxFileSize;
+      infoMap['size'] < room.client.database!.maxFileSize;
   bool get isThumbnailSmallEnough =>
       thumbnailInfoMap['size'] is int &&
-      thumbnailInfoMap['size'] < room.client.database.maxFileSize;
+      thumbnailInfoMap['size'] < room.client.database!.maxFileSize;
 
   bool get showThumbnail =>
       [MessageTypes.Image, MessageTypes.Sticker, MessageTypes.Video]
@@ -32,7 +34,7 @@ extension LocalizedBody on Event {
           isThumbnailSmallEnough ||
           (content['url'] is String));
 
-  String get sizeString {
+  String? get sizeString {
     if (content['info'] is Map<String, dynamic> &&
         content['info'].containsKey('size')) {
       num size = content['info']['size'];
@@ -58,6 +60,7 @@ extension LocalizedBody on Event {
 
   Future<bool> isAttachmentCached({bool getThumbnail = false}) async {
     final mxcUrl = attachmentOrThumbnailMxcUrl(getThumbnail: getThumbnail);
+    if (mxcUrl == null) return false;
     // check if we have it in-memory
     if (_downloadAndDecryptFutures.containsKey(mxcUrl)) {
       return true;
@@ -72,7 +75,7 @@ extension LocalizedBody on Event {
     return file != null;
   }
 
-  Future<MatrixFile> downloadAndDecryptAttachmentCached(
+  Future<MatrixFile?> downloadAndDecryptAttachmentCached(
       {bool getThumbnail = false}) async {
     final mxcUrl =
         attachmentOrThumbnailMxcUrl(getThumbnail: getThumbnail).toString();

lib/utils/matrix_sdk_extensions.dart/filtered_timeline_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:matrix/matrix.dart';
 
 import '../../config/app_config.dart';
@@ -30,13 +32,14 @@ extension FilteredTimelineExtension on Timeline {
           filteredEvents[i - 1].isState &&
           !unfolded.contains(filteredEvents[i - 1].eventId)) {
         counter++;
-        filteredEvents[i].unsigned['im.fluffychat.collapsed_state_event'] =
+        filteredEvents[i].unsigned ??= {};
+        filteredEvents[i].unsigned!['im.fluffychat.collapsed_state_event'] =
             true;
       } else {
-        filteredEvents[i].unsigned['im.fluffychat.collapsed_state_event'] =
+        filteredEvents[i].unsigned!['im.fluffychat.collapsed_state_event'] =
             false;
         filteredEvents[i]
-            .unsigned['im.fluffychat.collapsed_state_event_count'] = counter;
+            .unsigned!['im.fluffychat.collapsed_state_event_count'] = counter;
         counter = 0;
       }
     }

lib/utils/matrix_sdk_extensions.dart/matrix_file_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:io';
 
 import 'package:flutter/material.dart';
@@ -16,14 +18,14 @@ extension MatrixFileExtension on MatrixFile {
     if (PlatformInfos.isMobile) {
       final tmpDirectory = PlatformInfos.isAndroid
           ? (await getExternalStorageDirectories(
-                  type: StorageDirectory.downloads))
+                  type: StorageDirectory.downloads))!
               .first
           : await getTemporaryDirectory();
       final path = '${tmpDirectory.path}$fileName';
       await File(path).writeAsBytes(bytes);
       await Share.shareFiles([path]);
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(L10n.of(context).savedFileAs(path))),
+        SnackBar(content: Text(L10n.of(context)!.savedFileAs(path))),
       );
       return;
     } else {

lib/utils/matrix_sdk_extensions.dart/matrix_locals.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:matrix/matrix.dart';
 

lib/utils/matrix_sdk_extensions.dart/presence_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -8,25 +10,27 @@ import '../date_time_extension.dart';
 extension PresenceExtension on Presence {
   String getLocalizedLastActiveAgo(BuildContext context) {
     if (presence.lastActiveAgo != null && presence.lastActiveAgo != 0) {
-      return L10n.of(context).lastActiveAgo(DateTime.fromMillisecondsSinceEpoch(
-              DateTime.now().millisecondsSinceEpoch - presence.lastActiveAgo)
-          .localizedTimeShort(context));
+      return L10n.of(context)!.lastActiveAgo(
+          DateTime.fromMillisecondsSinceEpoch(
+                  DateTime.now().millisecondsSinceEpoch -
+                      presence.lastActiveAgo!)
+              .localizedTimeShort(context));
     }
-    return L10n.of(context).lastSeenLongTimeAgo;
+    return L10n.of(context)!.lastSeenLongTimeAgo;
   }
 
   String getLocalizedStatusMessage(BuildContext context) {
     if (presence.statusMsg?.isNotEmpty ?? false) {
-      return presence.statusMsg;
+      return presence.statusMsg!;
     }
     if (presence.currentlyActive ?? false) {
-      return L10n.of(context).currentlyActive;
+      return L10n.of(context)!.currentlyActive;
     }
     return getLocalizedLastActiveAgo(context);
   }
 
   Color get color {
-    switch (presence?.presence ?? PresenceType.offline) {
+    switch (presence.presence) {
       case PresenceType.online:
         return Colors.green;
       case PresenceType.offline:

lib/utils/platform_infos.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:io';
 
 import 'package:flutter/foundation.dart';
@@ -50,7 +52,7 @@ abstract class PlatformInfos {
         Text('Version: $version'),
         OutlinedButton(
           onPressed: () => launch(AppConfig.sourceCodeUrl),
-          child: Text(L10n.of(context).sourceCode),
+          child: Text(L10n.of(context)!.sourceCode),
         ),
         OutlinedButton(
           onPressed: () => launch(AppConfig.emojiFontUrl),
@@ -60,7 +62,7 @@ abstract class PlatformInfos {
           onPressed: () => VRouter.of(context).to('logs'),
           child: const Text('Logs'),
         ),
-        SentrySwitchListTile.adaptive(label: L10n.of(context).sendBugReports),
+        SentrySwitchListTile.adaptive(label: L10n.of(context)!.sendBugReports),
       ],
       applicationIcon: Image.asset('assets/logo.png', width: 64, height: 64),
       applicationName: AppConfig.applicationName,

lib/utils/room_send_file_extension.dart

@@ -1,20 +1,4 @@
-/*
- *   Famedly App
- *   Copyright (C) 2020 Famedly GmbH
- *
- *   This program is free software: you can redistribute it and/or modify
- *   it under the terms of the GNU Affero General Public License as
- *   published by the Free Software Foundation, either version 3 of the
- *   License, or (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- *   GNU Affero General Public License for more details.
- *
- *   You should have received a copy of the GNU Affero General Public License
- *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
+//@dart=2.12
 
 import 'package:matrix/matrix.dart';
 
@@ -23,12 +7,12 @@ import 'resize_image.dart';
 extension RoomSendFileExtension on Room {
   Future<Uri> sendFileEventWithThumbnail(
     MatrixFile file, {
-    String txid,
-    Event inReplyTo,
-    String editEventId,
-    bool waitUntilSent,
+    String? txid,
+    Event? inReplyTo,
+    String? editEventId,
+    bool? waitUntilSent,
   }) async {
-    MatrixFile thumbnail;
+    MatrixImageFile? thumbnail;
     if (file is MatrixImageFile) {
       thumbnail = await file.resizeImage();
 

lib/utils/room_status_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/widgets.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -8,31 +10,32 @@ import 'date_time_extension.dart';
 import 'matrix_sdk_extensions.dart/filtered_timeline_extension.dart';
 
 extension RoomStatusExtension on Room {
-  Presence get directChatPresence => client.presences[directChatMatrixID];
+  Presence? get directChatPresence => client.presences[directChatMatrixID];
 
   String getLocalizedStatus(BuildContext context) {
     if (isDirectChat) {
+      final directChatPresence = this.directChatPresence;
       if (directChatPresence != null &&
-          directChatPresence.presence != null &&
           (directChatPresence.presence.lastActiveAgo != null ||
               directChatPresence.presence.currentlyActive != null)) {
         if (directChatPresence.presence.statusMsg?.isNotEmpty ?? false) {
-          return directChatPresence.presence.statusMsg;
+          return directChatPresence.presence.statusMsg!;
         }
         if (directChatPresence.presence.currentlyActive == true) {
-          return L10n.of(context).currentlyActive;
+          return L10n.of(context)!.currentlyActive;
         }
         if (directChatPresence.presence.lastActiveAgo == null) {
-          return L10n.of(context).lastSeenLongTimeAgo;
+          return L10n.of(context)!.lastSeenLongTimeAgo;
         }
         final time = DateTime.fromMillisecondsSinceEpoch(
             DateTime.now().millisecondsSinceEpoch -
-                directChatPresence.presence.lastActiveAgo);
-        return L10n.of(context).lastActiveAgo(time.localizedTimeShort(context));
+                directChatPresence.presence.lastActiveAgo!);
+        return L10n.of(context)!
+            .lastActiveAgo(time.localizedTimeShort(context));
       }
-      return L10n.of(context).lastSeenLongTimeAgo;
+      return L10n.of(context)!.lastSeenLongTimeAgo;
     }
-    return L10n.of(context)
+    return L10n.of(context)!
         .countParticipants(summary.mJoinedMemberCount.toString());
   }
 
@@ -42,23 +45,23 @@ extension RoomStatusExtension on Room {
     typingUsers.removeWhere((User u) => u.id == client.userID);
 
     if (AppConfig.hideTypingUsernames) {
-      typingText = L10n.of(context).isTyping;
+      typingText = L10n.of(context)!.isTyping;
       if (typingUsers.first.id != directChatMatrixID) {
         typingText =
-            L10n.of(context).numUsersTyping(typingUsers.length.toString());
+            L10n.of(context)!.numUsersTyping(typingUsers.length.toString());
       }
     } else if (typingUsers.length == 1) {
-      typingText = L10n.of(context).isTyping;
+      typingText = L10n.of(context)!.isTyping;
       if (typingUsers.first.id != directChatMatrixID) {
         typingText =
-            L10n.of(context).userIsTyping(typingUsers.first.calcDisplayname());
+            L10n.of(context)!.userIsTyping(typingUsers.first.calcDisplayname());
       }
     } else if (typingUsers.length == 2) {
-      typingText = L10n.of(context).userAndUserAreTyping(
+      typingText = L10n.of(context)!.userAndUserAreTyping(
           typingUsers.first.calcDisplayname(),
           typingUsers[1].calcDisplayname());
     } else if (typingUsers.length > 2) {
-      typingText = L10n.of(context).userAndOthersAreTyping(
+      typingText = L10n.of(context)!.userAndOthersAreTyping(
           typingUsers.first.calcDisplayname(),
           (typingUsers.length - 1).toString());
     }

lib/utils/run_in_background.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:async';
 
 import 'package:isolate/isolate.dart';

lib/utils/sentry_controller.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 

lib/utils/stream_extension.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:async';
 
 extension StreamExtension on Stream {
@@ -5,11 +7,11 @@ extension StreamExtension on Stream {
   /// stream, ratelimited by the Duration t
   Stream<bool> rateLimit(Duration t) {
     final controller = StreamController<bool>();
-    Timer timer;
+    Timer? timer;
     var gotMessage = false;
     // as we call our inline-defined function recursively we need to make sure that the
     // variable exists prior of creating the function. Silly dart.
-    Function _onMessage;
+    Function? _onMessage;
     // callback to determine if we should send out an update
     _onMessage = () {
       // do nothing if it is already closed
@@ -25,7 +27,7 @@ extension StreamExtension on Stream {
           // method to send out an update!
           timer = null;
           if (gotMessage) {
-            _onMessage();
+            _onMessage?.call();
           }
         });
       } else {
@@ -33,7 +35,7 @@ extension StreamExtension on Stream {
         gotMessage = true;
       }
     };
-    final subscription = listen((_) => _onMessage(),
+    final subscription = listen((_) => _onMessage?.call(),
         onDone: () => controller.close(),
         onError: (e, s) => controller.addError(e, s));
     // add proper cleanup to the subscription and the controller, to not memory leak

lib/utils/string_color.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 extension StringColor on String {

lib/utils/ui_fake.dart

@@ -1,4 +0,0 @@
-// ignore: camel_case_types
-class platformViewRegistry {
-  static void registerViewFactory(String _, dynamic __) {}
-}

lib/utils/uia_request_manager.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'dart:async';
 
 import 'package:adaptive_dialog/adaptive_dialog.dart';
@@ -24,9 +26,9 @@ extension UiaRequestManager on MatrixState {
           final input = cachedPassword ??
               (await showTextInputDialog(
                 context: navigatorContext,
-                title: L10n.of(context).pleaseEnterYourPassword,
-                okLabel: L10n.of(context).ok,
-                cancelLabel: L10n.of(context).cancel,
+                title: L10n.of(context)!.pleaseEnterYourPassword,
+                okLabel: L10n.of(context)!.ok,
+                cancelLabel: L10n.of(context)!.cancel,
                 textFields: [
                   const DialogTextField(
                     minLines: 1,
@@ -37,20 +39,20 @@ extension UiaRequestManager on MatrixState {
                 ],
               ))
                   ?.single;
-          if (input?.isEmpty ?? true) {
+          if (input == null || input.isEmpty) {
             return uiaRequest.cancel();
           }
           return uiaRequest.completeStage(
             AuthenticationPassword(
               session: uiaRequest.session,
               password: input,
-              identifier: AuthenticationUserIdentifier(user: client.userID),
+              identifier: AuthenticationUserIdentifier(user: client.userID!),
             ),
           );
         case AuthenticationTypes.emailIdentity:
           if (currentThreepidCreds == null || currentClientSecret == null) {
             return uiaRequest.cancel(
-              UiaException(L10n.of(widget.context).serverRequiresEmail),
+              UiaException(L10n.of(widget.context)!.serverRequiresEmail),
             );
           }
           final auth = AuthenticationThreePidCreds(
@@ -65,10 +67,10 @@ extension UiaRequestManager on MatrixState {
               await showOkCancelAlertDialog(
                 useRootNavigator: false,
                 context: navigatorContext,
-                title: L10n.of(context).weSentYouAnEmail,
-                message: L10n.of(context).pleaseClickOnLink,
-                okLabel: L10n.of(context).iHaveClickedOnLink,
-                cancelLabel: L10n.of(context).cancel,
+                title: L10n.of(context)!.weSentYouAnEmail,
+                message: L10n.of(context)!.pleaseClickOnLink,
+                okLabel: L10n.of(context)!.iHaveClickedOnLink,
+                cancelLabel: L10n.of(context)!.cancel,
               )) {
             return uiaRequest.completeStage(auth);
           }
@@ -90,7 +92,7 @@ extension UiaRequestManager on MatrixState {
                 action: (_, __) {
                   uiaRequest.cancel();
                 },
-                label: L10n.of(context).cancel,
+                label: L10n.of(context)!.cancel,
                 id: 0,
               ),
             );
@@ -101,10 +103,10 @@ extension UiaRequestManager on MatrixState {
             if (OkCancelResult.ok ==
                 await showOkCancelAlertDialog(
                   useRootNavigator: false,
-                  message: L10n.of(context).pleaseFollowInstructionsOnWeb,
+                  message: L10n.of(context)!.pleaseFollowInstructionsOnWeb,
                   context: navigatorContext,
-                  okLabel: L10n.of(context).next,
-                  cancelLabel: L10n.of(context).cancel,
+                  okLabel: L10n.of(context)!.next,
+                  cancelLabel: L10n.of(context)!.cancel,
                 )) {
               return uiaRequest.completeStage(
                 AuthenticationData(session: uiaRequest.session),