fix: SSO on web hopefully

lib/pages/homeserver_picker.dart

@@ -1,12 +1,21 @@
+import 'dart:async';
+
 import 'package:famedlysdk/famedlysdk.dart';
 import 'package:fluffychat/pages/views/homeserver_picker_view.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/config/setting_keys.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:flutter/material.dart';
 import '../utils/localized_exception_extension.dart';
 import 'package:vrouter/vrouter.dart';
+import 'package:fluffychat/utils/platform_infos.dart';
+import 'package:future_loading_dialog/future_loading_dialog.dart';
+import 'package:uni_links/uni_links.dart';
+import 'package:universal_html/html.dart' as html;
+
+import '../main.dart';
 
 class HomeserverPicker extends StatefulWidget {
   @override
@@ -18,6 +27,55 @@ class HomeserverPickerController extends State<HomeserverPicker> {
   String domain = AppConfig.defaultHomeserver;
   final TextEditingController homeserverController =
       TextEditingController(text: AppConfig.defaultHomeserver);
+  StreamSubscription _intentDataStreamSubscription;
+
+  void _loginWithToken(String token) {
+    if (token?.isEmpty ?? true) return;
+    showFutureLoadingDialog(
+      context: context,
+      future: () => Matrix.of(context).client.login(
+            type: AuthenticationTypes.token,
+            token: token,
+            initialDeviceDisplayName: PlatformInfos.clientName,
+          ),
+    );
+  }
+
+  void _processIncomingUris(String text) async {
+    if (text == null || !text.startsWith(AppConfig.appOpenUrlScheme)) return;
+    VRouter.of(context).push('/home');
+    final token = Uri.parse(text).queryParameters['loginToken'];
+    if (token != null) _loginWithToken(token);
+  }
+
+  void _initReceiveUri() {
+    if (!PlatformInfos.isMobile) return;
+    // For receiving shared Uris
+    _intentDataStreamSubscription = linkStream.listen(_processIncomingUris);
+    if (FluffyChatApp.gotInitialLink == false) {
+      FluffyChatApp.gotInitialLink = true;
+      getInitialLink().then(_processIncomingUris);
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _initReceiveUri();
+    if (kIsWeb) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        final token =
+            Uri.parse(html.window.location.href).queryParameters['loginToken'];
+        _loginWithToken(token);
+      });
+    }
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    _intentDataStreamSubscription?.cancel();
+  }
 
   /// Starts an analysis of the given homeserver. It uses the current domain and
   /// makes sure that it is prefixed with https. Then it searches for the