feat:implementacion grafica 2.0

lib/features/auth/data/models/auth_user_model.dart

@@ -0,0 +1,69 @@
+import '../../domain/entities/auth_user.dart';
+
+/// Modelo de datos que extiende la entidad [AuthUser].
+/// Responsable de serialización/deserialización JSON.
+/// En la fase MVP el token se simula localmente (sin llamada real a backend).
+class AuthUserModel extends AuthUser {
+  const AuthUserModel({
+    required super.token,
+    required super.email,
+    required super.role,
+    required super.issuedAt,
+    required super.expiresAt,
+  });
+
+  factory AuthUserModel.fromJson(Map<String, dynamic> json) {
+    return AuthUserModel(
+      token: json['token'] as String,
+      email: json['email'] as String,
+      role: json['role'] as String? ?? 'citizen',
+      issuedAt: DateTime.parse(json['issued_at'] as String),
+      expiresAt: DateTime.parse(json['expires_at'] as String),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'token': token,
+      'email': email,
+      'role': role,
+      'issued_at': issuedAt.toIso8601String(),
+      'expires_at': expiresAt.toIso8601String(),
+    };
+  }
+
+  /// Crea un token JWT simulado para la fase MVP.
+  /// En producción este token vendría del backend con firma RS256.
+  factory AuthUserModel.simulatedJwt({
+    required String email,
+    required String role,
+  }) {
+    final now = DateTime.now();
+    // Header.Payload.Signature — simulado con base64 simple
+    final header = 'eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9';
+    final payloadRaw =
+        '{"sub":"usr_${email.hashCode.abs()}","email":"$email","role":"$role",'
+        '"iat":${now.millisecondsSinceEpoch},'
+        '"exp":${now.add(const Duration(hours: 8)).millisecondsSinceEpoch},'
+        '"iss":"waste-notify-mvp"}';
+    // ignore: deprecated_member_use
+    final payload = _base64UrlEncode(payloadRaw);
+    const signature = 'SIMULATED_SIGNATURE_MVP';
+
+    return AuthUserModel(
+      token: '$header.$payload.$signature',
+      email: email,
+      role: role,
+      issuedAt: now,
+      expiresAt: now.add(const Duration(hours: 8)),
+    );
+  }
+
+  static String _base64UrlEncode(String input) {
+    final bytes = input.codeUnits;
+    final encoded = bytes
+        .map((b) => b.toRadixString(16).padLeft(2, '0'))
+        .join();
+    return encoded.substring(0, encoded.length > 64 ? 64 : encoded.length);
+  }
+}