chore: Implement pick SSO provider from dialog and add tchncs.de

lib/utils/sign_in_flows/check_homeserver.dart

@@ -52,7 +52,7 @@ Future<void> connectToHomeserverFlow(
     if (authMetadata != null && AppSettings.enableMatrixNativeOIDC.value) {
       await oidcLoginFlow(client, context, signUp);
     } else if (supportsSso) {
-      await ssoLoginFlow(client, context, signUp);
+      await ssoLoginFlow(client, context, signUp, loginFlows);
     } else {
       if (signUp && regLink != null) {
         await launchUrlString(regLink);

lib/utils/sign_in_flows/sso_login.dart

@@ -3,20 +3,52 @@ import 'package:flutter/material.dart';
 import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
 import 'package:matrix/matrix.dart';
 
+import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
 import 'package:fluffychat/utils/sign_in_flows/calc_redirect_url.dart';
+import 'package:fluffychat/widgets/adaptive_dialogs/show_modal_action_popup.dart';
 
 Future<void> ssoLoginFlow(
   Client client,
   BuildContext context,
   bool signUp,
+  List<LoginFlow> loginFlows,
 ) async {
   final (redirectUrl, urlScheme) = calcRedirectUrl(withAuthHtmlPath: true);
 
   Logs().i('Starting legacy SSO Flow with redirect URL', redirectUrl);
 
+  final ssoProviders =
+      (loginFlows
+                  .firstWhere((flow) => flow.type == 'm.login.sso')
+                  .additionalProperties['identity_providers']
+              as List?)
+          ?.map(
+            (json) => (
+              name: json['name'] as String,
+              id: json['id'] as String,
+              brand: json['brand'] as String?,
+              icon: json['icon'] as String?,
+            ),
+          )
+          .toList();
+
+  final provider = ssoProviders == null
+      ? null
+      : await showModalActionPopup(
+          context: context,
+          title: L10n.of(context).logInTo(client.homeserver!.host),
+          actions: ssoProviders
+              .map(
+                (provider) =>
+                    AdaptiveModalAction(label: provider.name, value: provider),
+              )
+              .toList(),
+        );
+
   final url = client.homeserver!.replace(
-    path: '/_matrix/client/v3/login/sso/redirect',
+    path:
+        '/_matrix/client/v3/login/sso/redirect${provider == null ? '' : '/${provider.id}'}',
     queryParameters: {
       'redirectUrl': redirectUrl.toString(),
       'action': signUp ? 'register' : 'login',

recommended_homeservers.json

@@ -19,6 +19,17 @@
                 "All",
                 "English"
             ]
+        },
+        {
+            "name": "tchncs.de",
+            "website": "https://tchncs.de",
+            "description": "A general homeserver. Owner also hosts other FOSS services.",
+            "reg_method": "oidc",
+            "languages": [
+                "All",
+                "English",
+                "Deutsch"
+            ]
         }
     ]
 }