feat: Implement matrix native oidc

lib/pages/sign_in/view_model/flows/check_homeserver.dart

@@ -5,6 +5,7 @@ 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';
@@ -27,16 +28,33 @@ void connectToHomeserverFlow(
     }
     final l10n = L10n.of(context);
     final client = await Matrix.of(context).getLoginClient();
-    final (_, _, loginFlows, _) = await client.checkHomeserver(homeserver);
+    final (_, _, loginFlows, authMetadata) = await client.checkHomeserver(
+      homeserver,
+      fetchAuthMetadata: true,
+    );
 
+    final regLink = homeserverData.regLink;
     final supportsSso = loginFlows.any((flow) => flow.type == 'm.login.sso');
 
-    if (!supportsSso) {
-      final regLink = homeserverData.regLink;
+    if ((kIsWeb || PlatformInfos.isLinux) &&
+        (supportsSso || authMetadata != null || (signUp && regLink != null))) {
+      final consent = await showOkCancelAlertDialog(
+        context: context,
+        title: l10n.appWantsToUseForLogin(homeserverInput),
+        message: l10n.appWantsToUseForLoginDescription,
+        okLabel: l10n.continueText,
+      );
+      if (consent != OkCancelResult.ok) return;
+    }
+
+    if (authMetadata != null) {
+      await oidcLoginFlow(client, context, signUp);
+    } else if (supportsSso) {
+      await ssoLoginFlow(client, context, signUp);
+    } else {
       if (signUp && regLink != null) {
         await launchUrlString(regLink);
       }
-
       final pathSegments = List.of(
         GoRouter.of(context).routeInformationProvider.value.uri.pathSegments,
       );
@@ -46,18 +64,10 @@ void connectToHomeserverFlow(
       setState(AsyncSnapshot.withData(ConnectionState.done, true));
       return;
     }
-    if (kIsWeb || PlatformInfos.isLinux) {
-      final consent = await showOkCancelAlertDialog(
-        context: context,
-        title: l10n.appWantsToUseForLogin(homeserverInput),
-        message: l10n.appWantsToUseForLoginDescription,
-        okLabel: l10n.continueText,
-      );
-      if (consent != OkCancelResult.ok) return;
-    }
-    await ssoLoginFlow(client, context, signUp);
 
-    setState(AsyncSnapshot.withData(ConnectionState.done, true));
+    if (context.mounted) {
+      setState(AsyncSnapshot.withData(ConnectionState.done, true));
+    }
   } catch (e, s) {
     setState(AsyncSnapshot.withError(ConnectionState.done, e, s));
     if (!context.mounted) return;

lib/pages/sign_in/view_model/flows/oidc_login.dart

@@ -0,0 +1,91 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
+import 'package:matrix/matrix.dart';
+import 'package:universal_html/html.dart' as html;
+
+import 'package:fluffychat/config/app_config.dart';
+import 'package:fluffychat/config/setting_keys.dart';
+import 'package:fluffychat/l10n/l10n.dart';
+import 'package:fluffychat/utils/platform_infos.dart';
+import 'package:fluffychat/widgets/adaptive_dialogs/show_ok_cancel_alert_dialog.dart';
+
+Future<void> oidcLoginFlow(
+  Client client,
+  BuildContext context,
+  bool signUp,
+) async {
+  Logs().i('Starting Matrix Native OIDC Flow...');
+  final redirectUrl = kIsWeb
+      ? Uri.parse(
+          html.window.location.href,
+        ).resolveUri(Uri(pathSegments: ['auth.html']))
+      : (PlatformInfos.isMobile || PlatformInfos.isWeb || PlatformInfos.isMacOS)
+      ? Uri.parse('${AppConfig.appOpenUrlScheme.toLowerCase()}:/login')
+      : Uri.parse('http://localhost:3001/login');
+
+  final urlScheme =
+      (PlatformInfos.isMobile || PlatformInfos.isWeb || PlatformInfos.isMacOS)
+      ? redirectUrl.scheme
+      : 'http://localhost:3001';
+
+  final clientUri = Uri.parse(AppConfig.website);
+  final supportWebPlatform =
+      kIsWeb &&
+      kReleaseMode &&
+      redirectUrl.scheme == 'https' &&
+      redirectUrl.host.contains(clientUri.host);
+  if (!supportWebPlatform) {
+    Logs().w(
+      'OIDC Application Type web is not supported. Using native now. Please use this instance not in production!',
+    );
+  }
+
+  final oidcClientData = await client.registerOidcClient(
+    redirectUris: [redirectUrl],
+    applicationType: supportWebPlatform
+        ? OidcApplicationType.web
+        : OidcApplicationType.native,
+    clientInformation: OidcClientInformation(
+      clientName: AppSettings.applicationName.value,
+      clientUri: clientUri,
+      logoUri: Uri.parse('https://fluffy.chat/assets/favicon.png'),
+      tosUri: null,
+      policyUri: AppConfig.privacyUrl,
+    ),
+  );
+
+  final session = await client.initOidcLoginSession(
+    oidcClientData: oidcClientData,
+    redirectUri: redirectUrl,
+    prompt: signUp ? 'create' : null,
+  );
+
+  if (!PlatformInfos.isMobile && !PlatformInfos.isMacOS) {
+    final consent = await showOkCancelAlertDialog(
+      context: context,
+      title: L10n.of(
+        context,
+      ).appWantsToUseForLogin(client.homeserver!.toString()),
+      message: L10n.of(context).appWantsToUseForLoginDescription,
+      okLabel: L10n.of(context).continueText,
+    );
+    if (consent != OkCancelResult.ok) return;
+  }
+  if (!context.mounted) return;
+
+  final returnUrlString = await FlutterWebAuth2.authenticate(
+    url: session.authenticationUri.toString(),
+    callbackUrlScheme: urlScheme,
+    options: FlutterWebAuth2Options(useWebview: PlatformInfos.isMobile),
+  );
+  final returnUrl = Uri.parse(returnUrlString);
+  final queryParameters = returnUrl.hasFragment
+      ? Uri.parse(returnUrl.fragment).queryParameters
+      : returnUrl.queryParameters;
+  final code = queryParameters['code'] as String;
+  final state = queryParameters['state'] as String;
+
+  await client.oidcLogin(session: session, code: code, state: state);
+}

lib/pages/sign_in/view_model/flows/sso_login.dart

@@ -13,6 +13,7 @@ Future<void> ssoLoginFlow(
   BuildContext context,
   bool signUp,
 ) async {
+  Logs().i('Starting legacy SSO Flow...');
   final redirectUrl = kIsWeb
       ? Uri.parse(
           html.window.location.href,