liblanis

Pure Dart client for Schulportal Hessen (SPH / Lanis).

Session stack, multi-account storage, optional sqlite3 persistence, injectable secrets, and applet parsers. No Flutter dependency for the core API. Flutter apps can use the Riverpod integration documented below.

Published on pub.dev. Also used as a submodule of lanis-mobile/lanis.

Features

• Full SPH session stack (login, cookies, RSA/AES cryptor, HTML/JSON applet parsers)
• **EasyLanisClient** — imperative API without Riverpod (default for scripts, CI, other Dart projects)
• Optional Riverpod multi-account registry for Flutter apps
• Optional single SQLite database (file or in-memory)
• sharedOverAccountSettings and accountSpecificSettings with typed helpers
• Offline applet snapshots table (substitutions & timetable write in v1; API is generic)
• Configurable StorageManager (caller supplies cache directory)

Install

dart pub add liblanis

Or add liblanis under dependencies in your pubspec.yaml (see pub.dev for the current version). For Flutter apps that use the Riverpod API, also add:

dependencies:
  flutter_riverpod: ^3.0.0
  sqlite3_flutter_libs: ^0.5.0 # load native sqlite on mobile

Quick start

Import package:liblanis/easy_client.dart. No ProviderScope or code generation required.

In-memory (tests, quick scripts)

import 'package:liblanis/easy_client.dart';

Future<void> main() async {
  final client = EasyLanisClient.inMemory();

  final id = await client.accounts.add(
    schoolId: 5151,
    username: 'student.user',
    password: r'...',
  );

  await client.login(accountId: id);

  // Direct parser call
  final plan = await client.parsers.substitutions.getHome();

  // Cached fetch with offline fallback (same as AppletParser.fetchData)
  final response = await client.parsers.calendar.fetch(forceRefresh: true);
  if (response.contentStatus == ContentStatus.offline) {
    // using cached events
  }

  client.connection.onStatusChanged.listen((status) {
    // ConnectionStatus.connected / disconnected
  });

  await client.logout();
  await client.dispose();
}

Available parsers

Access via client.parsers after login:

Getter	Applet
substitutions	Vertretungsplan
timetable	Stundenplan (student)
calendar	Kalender
conversations	Nachrichten
lessonsStudent	Mein Unterricht (student)
lessonsTeacher	Mein Unterricht (teacher)
dataStorage	Dateispeicher
studyGroups	Lerngruppen

Generic access for smoke tests: client.parsers.forApplet('kalender.php').

Flutter (Riverpod)

Prefer package:liblanis/liblanis.dart when you want the provider-based multi-account API used by lanis-mobile.

On Flutter mobile hosts, initialize sqlite before runApp:

import 'package:sqlite3_flutter_libs/sqlite3_flutter_libs.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await applyWorkaroundToOpenSqlite3OnOldAndroidVersions();
  // ...
}

Configure and mount

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:liblanis/liblanis.dart';

Future<void> main() async {
  final overrides = LanisClient.configure(
    databasePath: '/path/to/lanis.db', // null => in-memory
    secretStore: MySecureStore(),      // required when databasePath != null
    documentCacheDirectory: '/path/to/cache', // required for downloads
    // httpAdapter: cronetAdapter,     // optional
    userAgent: 'Lanis-Mobile/v3.7.2+83',
  );

  runApp(
    ProviderScope(
      overrides: overrides,
      child: const MyApp(),
    ),
  );
}

class MySecureStore implements SecretStore {
  // e.g. FlutterSecureStorage
  @override
  Future<void> write(String key, String value) async { /* ... */ }
  @override
  Future<String?> read(String key) async => null;
  @override
  Future<void> delete(String key) async { /* ... */ }
}

Accounts & session

final id = await ref.read(accountsProvider.notifier).add(
  schoolId: 5151,
  schoolName: 'Example',
  username: 'user',
  password: 'pass',
);

await ref.read(activeAccountProvider.notifier).select(id);
await ref.read(sessionProvider.notifier).authenticate();

ref.listen(connectionStatusProvider, (prev, next) {
  // ConnectionStatus.connected / disconnected
});

Settings

final shared = ref.read(sharedOverAccountSettingsProvider);
shared.setString('theme', 'dark');

final account = ref.read(accountSpecificSettingsProvider);
account.setJsonMap('vertretungsplan.php/filter', {/* ... */});

Applets

final response = await ref.read(substitutionsProvider.future);
if (response.contentStatus == ContentStatus.offline) {
  // cached SubstitutionPlan
}
final plan = response.content;

// Or use the long-lived parser + stream:
final parser = ref.read(substitutionsParserProvider);
await parser.fetchData();
parser.stream.listen(/* FetcherResponse<SubstitutionPlan> */);

Document downloads

final storage = ref.read(storageManagerProvider);
if (storage != null) {
  final path = await storage.downloadFile(url, filename);
}

Calling download APIs without documentCacheDirectory throws StorageNotConfiguredException.

Configuration rules

Option	Behavior
databasePath: null	In-memory sqlite; SecretStore optional
databasePath: set	File DB; **secretStore required**
documentCacheDirectory: null	Downloads disabled
httpAdapter	Optional Dio adapter injection

Development

cd liblanis
dart pub get
dart run build_runner build
dart test
dart analyze

License

GPL-3.0 — see LICENSE.