feat: Add presetHomeserver config to enforce a homeserver for web

lib/config/setting_keys.dart

@@ -52,7 +52,9 @@ enum AppSettings<T> {
   // colorSchemeSeed stored as ARGB int
   colorSchemeSeedInt<int>('chat.fluffy.color_scheme_seed', 0xFF5625BA),
   emojiSuggestionLocale<String>('emoji_suggestion_locale', ''),
-  enableSoftLogout<bool>('chat.fluffy.enable_soft_logout', false);
+  enableSoftLogout<bool>('chat.fluffy.enable_soft_logout', false),
+  presetHomeserver<String>('chat.fluffy.preset_homeserver', ''),
+  welcomeText<String>('chat.fluffy.welcome_text', '');
 
   final String key;
   final T defaultValue;

lib/pages/intro/intro_page.dart

@@ -13,13 +13,17 @@ import 'package:fluffychat/widgets/layouts/login_scaffold.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
 class IntroPage extends StatelessWidget {
-  final bool isLoading;
-  final String? loggingInToHomeserver;
+  final bool isLoading, hasPresetHomeserver;
+  final String? loggingInToHomeserver, welcomeText;
+  final VoidCallback login;
 
   const IntroPage({
     required this.isLoading,
     required this.loggingInToHomeserver,
     super.key,
+    required this.hasPresetHomeserver,
+    required this.welcomeText,
+    required this.login,
   });
 
   @override
@@ -119,7 +123,7 @@ class IntroPage extends StatelessWidget {
                               horizontal: 32.0,
                             ),
                             child: SelectableLinkify(
-                              text: L10n.of(context).appIntro,
+                              text: welcomeText ?? L10n.of(context).appIntro,
                               textScaleFactor: MediaQuery.textScalerOf(
                                 context,
                               ).scale(1),
@@ -138,41 +142,42 @@ class IntroPage extends StatelessWidget {
                               mainAxisSize: .min,
                               crossAxisAlignment: .stretch,
                               children: [
-                                ElevatedButton(
-                                  style: ElevatedButton.styleFrom(
-                                    backgroundColor:
-                                        theme.colorScheme.secondary,
-                                    foregroundColor:
-                                        theme.colorScheme.onSecondary,
+                                if (!hasPresetHomeserver)
+                                  ElevatedButton(
+                                    style: ElevatedButton.styleFrom(
+                                      backgroundColor:
+                                          theme.colorScheme.secondary,
+                                      foregroundColor:
+                                          theme.colorScheme.onSecondary,
+                                    ),
+                                    onPressed: () => context.go(
+                                      '${GoRouterState.of(context).uri.path}/sign_up',
+                                    ),
+                                    child: Text(
+                                      L10n.of(context).createNewAccount,
+                                    ),
                                   ),
-                                  onPressed: () => context.go(
-                                    '${GoRouterState.of(context).uri.path}/sign_up',
-                                  ),
-                                  child: Text(
-                                    L10n.of(context).createNewAccount,
-                                  ),
-                                ),
                                 SizedBox(height: 16),
                                 ElevatedButton(
-                                  onPressed: () => context.go(
-                                    '${GoRouterState.of(context).uri.path}/sign_in',
-                                  ),
+                                  onPressed: login,
                                   child: Text(L10n.of(context).signIn),
                                 ),
-                                TextButton(
-                                  onPressed: () async {
-                                    final client = await Matrix.of(
-                                      context,
-                                    ).getLoginClient();
-                                    context.go(
-                                      '${GoRouterState.of(context).uri.path}/login',
-                                      extra: client,
-                                    );
-                                  },
-                                  child: Text(
-                                    L10n.of(context).loginWithMatrixId,
+
+                                if (!hasPresetHomeserver)
+                                  TextButton(
+                                    onPressed: () async {
+                                      final client = await Matrix.of(
+                                        context,
+                                      ).getLoginClient();
+                                      context.go(
+                                        '${GoRouterState.of(context).uri.path}/login',
+                                        extra: client,
+                                      );
+                                    },
+                                    child: Text(
+                                      L10n.of(context).loginWithMatrixId,
+                                    ),
                                   ),
-                                ),
                               ],
                             ),
                           ),

lib/pages/intro/intro_page_presenter.dart

@@ -3,14 +3,18 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
+import 'package:go_router/go_router.dart';
 import 'package:matrix/matrix_api_lite/utils/logs.dart';
 import 'package:matrix/msc_extensions/msc_2964_oidc_login_flow/msc_2964_oidc_login_flow.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:universal_html/universal_html.dart' as web;
 
+import 'package:fluffychat/config/setting_keys.dart';
 import 'package:fluffychat/pages/intro/intro_page.dart';
+import 'package:fluffychat/pages/sign_in/view_model/model/public_homeserver_data.dart';
 import 'package:fluffychat/utils/localized_exception_extension.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions/oidc_session_json_extension.dart';
+import 'package:fluffychat/utils/sign_in_flows/check_homeserver.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
 class IntroPagePresenter extends StatefulWidget {
@@ -49,11 +53,13 @@ class _IntroPagePresenterState extends State<IntroPagePresenter> {
 
     await store.remove(OidcSessionJsonExtension.storeKey);
     await store.remove(OidcSessionJsonExtension.homeserverStoreKey);
+    if (!mounted) return;
 
     if (homeserverUrl == null || session == null) {
       setState(() {
         isLoading = false;
       });
+
       return;
     }
     setState(() {
@@ -87,11 +93,31 @@ class _IntroPagePresenterState extends State<IntroPagePresenter> {
     }
   }
 
+  void _login() {
+    final presetHomeserver = AppSettings.presetHomeserver.value;
+    if (presetHomeserver.isEmpty) {
+      context.go('${GoRouterState.of(context).uri.path}/sign_in');
+      return;
+    }
+
+    connectToHomeserverFlow(
+      PublicHomeserverData(name: presetHomeserver),
+      context,
+      (snapshot) {},
+      false,
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return IntroPage(
       isLoading: isLoading,
       loggingInToHomeserver: loggingInToHomeserver,
+      hasPresetHomeserver: AppSettings.presetHomeserver.value.isNotEmpty,
+      welcomeText: AppSettings.welcomeText.value.isEmpty
+          ? null
+          : AppSettings.welcomeText.value,
+      login: _login,
     );
   }
 }

lib/pages/sign_in/sign_in_page.dart

@@ -5,10 +5,10 @@ import 'package:url_launcher/url_launcher_string.dart';
 import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/config/themes.dart';
 import 'package:fluffychat/l10n/l10n.dart';
-import 'package:fluffychat/pages/sign_in/view_model/flows/check_homeserver.dart';
 import 'package:fluffychat/pages/sign_in/view_model/model/public_homeserver_data.dart';
 import 'package:fluffychat/pages/sign_in/view_model/sign_in_view_model.dart';
 import 'package:fluffychat/utils/localized_exception_extension.dart';
+import 'package:fluffychat/utils/sign_in_flows/check_homeserver.dart';
 import 'package:fluffychat/widgets/layouts/login_scaffold.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 import 'package:fluffychat/widgets/view_model_builder.dart';

lib/pages/sign_in/view_model/sign_in_view_model.dart

@@ -7,7 +7,7 @@ import 'package:matrix/matrix_api_lite/utils/logs.dart';
 
 import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/config/setting_keys.dart';
-import 'package:fluffychat/pages/sign_in/view_model/flows/sort_homeservers.dart';
+import 'package:fluffychat/pages/sign_in/utils/sort_homeservers.dart';
 import 'package:fluffychat/pages/sign_in/view_model/model/public_homeserver_data.dart';
 import 'package:fluffychat/pages/sign_in/view_model/sign_in_state.dart';
 import 'package:fluffychat/widgets/matrix.dart';

lib/utils/sign_in_flows/check_homeserver.dart

@@ -5,11 +5,11 @@ import 'package:go_router/go_router.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 
 import 'package:fluffychat/l10n/l10n.dart';
-import 'package:fluffychat/pages/sign_in/view_model/flows/oidc_login.dart';
-import 'package:fluffychat/pages/sign_in/view_model/flows/sso_login.dart';
 import 'package:fluffychat/pages/sign_in/view_model/model/public_homeserver_data.dart';
 import 'package:fluffychat/utils/localized_exception_extension.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
+import 'package:fluffychat/utils/sign_in_flows/oidc_login.dart';
+import 'package:fluffychat/utils/sign_in_flows/sso_login.dart';
 import 'package:fluffychat/widgets/adaptive_dialogs/show_ok_cancel_alert_dialog.dart';
 import 'package:fluffychat/widgets/matrix.dart';