etape3

swiftyCompanion/swifty_companion/lib/services/intra_auth_service.dart

@@ -0,0 +1,77 @@
+import 'dart:convert';
+
+import 'package:flutter_appauth/flutter_appauth.dart';
+import 'package:http/http.dart' as http;
+
+import '../config/intra_config.dart';
+
+/// OAuth2 Intra : un token réutilisé pour toutes les requêtes API.
+class IntraAuthService {
+  IntraAuthService._();
+  static final IntraAuthService instance = IntraAuthService._();
+
+  final FlutterAppAuth _appAuth = const FlutterAppAuth();
+
+  String? _accessToken;
+
+  String? get accessToken => _accessToken;
+  bool get isAuthenticated => _accessToken != null && _accessToken!.isNotEmpty;
+
+  static final AuthorizationServiceConfiguration _serviceConfiguration =
+      AuthorizationServiceConfiguration(
+    authorizationEndpoint: IntraConfig.authorizeUrl,
+    tokenEndpoint: IntraConfig.tokenUrl,
+  );
+
+  Future<void> signIn() async {
+    if (!IntraConfig.isConfigured) {
+      throw StateError(
+        'CLIENT_ID, CLIENT_SECRET ou REDIRECT_URI manquant dans .env',
+      );
+    }
+
+    final result = await _appAuth.authorizeAndExchangeCode(
+      AuthorizationTokenRequest(
+        IntraConfig.clientId,
+        IntraConfig.redirectUri,
+        clientSecret: IntraConfig.clientSecret,
+        serviceConfiguration: _serviceConfiguration,
+        scopes: ['public'],
+      ),
+    );
+
+    _accessToken = result.accessToken;
+
+    if (!isAuthenticated) {
+      throw StateError('Connexion 42 annulée ou token absent');
+    }
+  }
+
+  void signOut() {
+    _accessToken = null;
+  }
+
+  /// Header Authorization pour les appels `api.intra.42.fr`.
+  Map<String, String> authHeaders() {
+    if (!isAuthenticated) {
+      throw StateError('Non connecté à l’Intra');
+    }
+    return {
+      'Authorization': 'Bearer $_accessToken',
+      'Accept': 'application/json',
+    };
+  }
+
+  Future<Map<String, dynamic>> fetchMe() async {
+    final response = await http.get(
+      Uri.parse('${IntraConfig.apiBaseUrl}/me'),
+      headers: authHeaders(),
+    );
+
+    if (response.statusCode != 200) {
+      throw Exception('GET /v2/me a échoué (${response.statusCode})');
+    }
+
+    return jsonDecode(response.body) as Map<String, dynamic>;
+  }
+}