TW-2947: Handle invitation link web page and routing

lib/config/go_routes/app_route_paths.dart

@@ -3,9 +3,14 @@
 /// This file contains all route paths used in go_router configuration
 /// and navigation calls to ensure consistency and prevent typos.
 abstract class AppRoutePaths {
+  static const matrixId = 'matrixId';
+
   // Security routes
   static const String roomsSecurityFull = '/rooms/security';
   static const String contactsVisibilitySegment = 'contactsVisibility';
   static const String contactsVisibilityFull =
       '$roomsSecurityFull/$contactsVisibilitySegment';
+
+  // Invitation route
+  static const String invitationLinkFull = '/chat/:matrixId';
 }

lib/config/go_routes/go_router.dart

@@ -14,6 +14,7 @@ import 'package:fluffychat/pages/chat_draft/draft_chat_adaptive_scaffold.dart';
 import 'package:fluffychat/pages/chat_encryption_settings/chat_encryption_settings.dart';
 import 'package:fluffychat/pages/error_page/error_page.dart';
 import 'package:fluffychat/pages/homeserver_picker/homeserver_picker.dart';
+import 'package:fluffychat/pages/invitation_link_web/invitation_link_web.dart';
 import 'package:fluffychat/pages/login/on_auth_redirect.dart';
 import 'package:fluffychat/pages/new_group/new_group_chat_info.dart';
 import 'package:fluffychat/pages/personal_qr/personal_qr.dart';
@@ -119,6 +120,17 @@ abstract class AppRoutes {
         return defaultPageBuilder(context, const OnAuthRedirect());
       },
     ),
+    GoRoute(
+      path: AppRoutePaths.invitationLinkFull,
+      redirect: loggedOutRedirect,
+      pageBuilder: (context, state) {
+        final matrixId = state.pathParameters[AppRoutePaths.matrixId];
+        return defaultPageBuilder(
+          context,
+          InvitationLinkWeb(matrixId: matrixId),
+        );
+      },
+    ),
     GoRoute(
       path: '/connect',
       pageBuilder: (context, state) =>

lib/pages/invitation_link_web/invitation_link_web.dart

@@ -0,0 +1,43 @@
+import 'package:fluffychat/utils/url_launcher.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:linagora_design_flutter/linagora_design_flutter.dart';
+
+class InvitationLinkWeb extends StatefulWidget {
+  final String? matrixId;
+
+  const InvitationLinkWeb({super.key, this.matrixId});
+
+  @override
+  State<InvitationLinkWeb> createState() => _InvitationLinkWebState();
+}
+
+class _InvitationLinkWebState extends State<InvitationLinkWeb> {
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final matrixId = widget.matrixId;
+      if (matrixId == null || matrixId.isEmpty) {
+        context.go('/rooms');
+        return;
+      }
+      UrlLauncher(
+        context,
+        url: widget.matrixId,
+      ).launchUrl(isInvitationLink: true);
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: CupertinoActivityIndicator(
+          color: LinagoraSysColors.material().onSurfaceVariant,
+        ),
+      ),
+    );
+  }
+}

lib/presentation/mixins/go_to_direct_chat_mixin.dart

@@ -34,6 +34,7 @@ mixin GoToDraftChatMixin {
     required BuildContext context,
     required String path,
     required ContactPresentationSearch contactPresentationSearch,
+    bool isInvitationLink = false,
   }) {
     final roomId = Matrix.of(
       context,
@@ -46,6 +47,7 @@ mixin GoToDraftChatMixin {
         context: context,
         path: path,
         contactPresentationSearch: contactPresentationSearch,
+        isInvitationLink: isInvitationLink
       );
     } else {
       TwakeDialog.showFutureLoadingDialogFullScreen(
@@ -79,10 +81,14 @@ mixin GoToDraftChatMixin {
     required BuildContext context,
     required String path,
     required ContactPresentationSearch contactPresentationSearch,
+    bool isInvitationLink = false,
   }) {
     if (contactPresentationSearch.matrixId ==
         Matrix.of(context).client.userID) {
       TwakeSnackBar.show(context, L10n.of(context)!.cannotCreateChatWithSelf);
+      if (isInvitationLink) {
+        context.go('/rooms');
+      }
       return;
     }
 

lib/utils/url_launcher.dart

@@ -31,7 +31,7 @@ class UrlLauncher with GoToDraftChatMixin {
       ? ChromeSafariBrowser()
       : null;
 
-  void launchUrl() {
+  void launchUrl({bool isInvitationLink = false}) {
     if (url!.toLowerCase().startsWith(AppConfig.deepLinkPrefix) ||
         url!.toLowerCase().startsWith(AppConfig.inviteLinkPrefix) ||
         {'#', '@', '!', '+', '\$'}.contains(url![0]) ||
@@ -50,7 +50,10 @@ class UrlLauncher with GoToDraftChatMixin {
         host: inviteUri.host,
         path: uri.path.replaceFirst('/chat', ''),
       );
-      return openMatrixToUrl(matrixToUri.toString());
+      return openMatrixToUrl(
+        customUrl: matrixToUri.toString(),
+        isInvitationLink: isInvitationLink,
+      );
     }
     if (!{'https', 'http'}.contains(uri.scheme)) {
       // just launch non-https / non-http uris directly
@@ -111,7 +114,10 @@ class UrlLauncher with GoToDraftChatMixin {
     );
   }
 
-  void openMatrixToUrl([String? customUrl]) async {
+  void openMatrixToUrl({
+    String? customUrl,
+    bool isInvitationLink = false,
+  }) async {
     final matrix = Matrix.of(context);
     final url = (customUrl ?? this.url!).replaceFirst(
       AppConfig.deepLinkPrefix,
@@ -218,6 +224,7 @@ class UrlLauncher with GoToDraftChatMixin {
       onContactTap(
         context: context,
         path: 'rooms',
+        isInvitationLink: true,
         contactPresentationSearch: ContactPresentationSearch(
           matrixId: identityParts.primaryIdentifier,
           displayName: