Šepot — end-to-end encrypted messenger
Initial public release. Anonymous on-device identity (no phone number, e-mail, or password), Signal-protocol cryptography (X3DH + PQXDH, Double Ratchet, sealed sender) via libsignal, a metadata-minimizing relay, group chats, disappearing messages, encrypted local storage, optional Tor transport, and a UI localized into Czech, English, German, Russian, and Italian. Monorepo: Flutter client (app/), Rust relay + wire types (rust/), protobuf definitions (proto/), self-host deploy (deploy/). Licensed under AGPL-3.0 with an app-store distribution exception (§7).
This commit is contained in:
Julius Joska
@@ -0,0 +1,191 @@
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/// Změna PINu ve třech krocích (starý → nový → potvrzení).
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///
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/// PIN se neověřuje proti hashi, ale unwrapem DEK (Argon2id). Každý pokus
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/// proto stojí ~2 s, což je zároveň jediná potřebná ochrana proti hádání.
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library;
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:go_router/go_router.dart';
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import 'package:sepot/core/crypto/dek_wrap.dart';
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import 'package:sepot/core/l10n/error_messages.dart';
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import 'package:sepot/core/l10n/l10n.dart';
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import 'package:sepot/core/storage/secure_storage.dart';
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import 'package:sepot/core/theme/app_theme.dart';
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import 'package:sepot/providers/storage_provider.dart';
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import 'package:sepot/widgets/pin_keypad.dart';
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enum _Krok { stary, novy, potvrzeni }
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class ChangePinScreen extends ConsumerStatefulWidget {
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const ChangePinScreen({super.key});
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@override
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ConsumerState<ChangePinScreen> createState() => _ChangePinScreenState();
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}
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class _ChangePinScreenState extends ConsumerState<ChangePinScreen> {
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_Krok _krok = _Krok.stary;
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String _pin = '';
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String? _staryPin;
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String? _novyPin;
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bool _pracuje = false;
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String? _chyba;
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(String, String) _titulky(AppLocalizations l10n) => switch (_krok) {
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_Krok.stary =>
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(l10n.pinChangeCurrentTitle, l10n.pinChangeCurrentSubtitle),
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_Krok.novy => (l10n.pinChangeNewTitle, l10n.pinChangeNewSubtitle),
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_Krok.potvrzeni =>
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(l10n.pinChangeConfirmTitle, l10n.pinChangeConfirmSubtitle),
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};
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void _reset(String chyba) {
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setState(() {
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_chyba = chyba;
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_pin = '';
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_staryPin = null;
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_novyPin = null;
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_krok = _Krok.stary;
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_pracuje = false;
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});
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}
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void _klavesa(String k) {
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if (_pracuje) return;
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setState(() {
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_chyba = null;
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if (k == 'DEL') {
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if (_pin.isNotEmpty) _pin = _pin.substring(0, _pin.length - 1);
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return;
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}
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if (_pin.length < 6) _pin += k;
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});
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if (_pin.length == 6) _hotovoSest();
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}
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Future<void> _hotovoSest() async {
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final storage = ref.read(storageProvider);
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switch (_krok) {
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case _Krok.stary:
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setState(() => _pracuje = true);
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final ok = await storage.verifyPin(_pin);
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if (!mounted) return;
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if (!ok) {
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_reset(context.l10n.pinWrong);
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return;
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}
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setState(() {
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_staryPin = _pin;
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_pin = '';
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_krok = _Krok.novy;
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_pracuje = false;
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});
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case _Krok.novy:
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if (_pin == _staryPin) {
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setState(() {
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_chyba = context.l10n.pinChangeMustDiffer;
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_pin = '';
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});
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return;
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}
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setState(() {
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_novyPin = _pin;
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_pin = '';
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_krok = _Krok.potvrzeni;
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});
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case _Krok.potvrzeni:
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if (_pin != _novyPin) {
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setState(() {
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_chyba = context.l10n.pinMismatch;
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_pin = '';
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_novyPin = null;
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_krok = _Krok.novy;
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});
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return;
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}
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setState(() => _pracuje = true);
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try {
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await storage.changePin(oldPin: _staryPin!, newPin: _novyPin!);
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} on DecoyPinConflict catch (e) {
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if (!mounted) return;
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_reset(describeError(context.l10n, e));
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return;
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} on WrongPinException {
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if (!mounted) return;
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_reset(context.l10n.pinWrong);
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return;
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} catch (_) {
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if (!mounted) return;
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_reset(context.l10n.pinChangeFailed);
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return;
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}
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if (!mounted) return;
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text(context.l10n.pinChanged)),
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);
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context.pop();
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}
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}
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@override
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Widget build(BuildContext context) {
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final (titulek, popis) = _titulky(context.l10n);
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return Scaffold(
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appBar: AppBar(title: Text(context.l10n.settingsChangePinTitle)),
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body: SafeArea(
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child: Padding(
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padding: const EdgeInsets.all(32),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text(
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titulek,
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style: const TextStyle(
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fontFamily: kFontSans,
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fontSize: 22,
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fontWeight: FontWeight.w700,
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color: SepotColors.textPrimary,
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),
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),
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const SizedBox(height: 8),
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Text(
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popis,
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style: const TextStyle(
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fontSize: 14, color: SepotColors.textSecondary),
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),
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const SizedBox(height: 40),
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PinDots(filled: _pin.length),
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if (_chyba != null) ...[
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const SizedBox(height: 16),
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Text(
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_chyba!,
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textAlign: TextAlign.center,
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style:
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const TextStyle(color: SepotColors.error, fontSize: 14),
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),
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],
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if (_pracuje) ...[
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const SizedBox(height: 16),
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// Argon2id (64 MiB, t=3) — pár sekund je záměr, ne prodleva.
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const SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(
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strokeWidth: 2, color: SepotColors.ember),
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),
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],
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const SizedBox(height: 40),
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PinKeypad(onKey: _klavesa, enabled: !_pracuje),
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],
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),
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),
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),
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);
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}
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}
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@@ -0,0 +1,240 @@
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:go_router/go_router.dart';
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import 'package:local_auth/local_auth.dart';
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import 'package:sepot/core/crypto/dek_wrap.dart';
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import 'package:sepot/core/l10n/l10n.dart';
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import 'package:sepot/core/theme/app_theme.dart';
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import 'package:sepot/providers/storage_provider.dart';
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import 'package:sepot/widgets/sepot_logo.dart';
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/// Odemykací obrazovka s PINem (+ volitelná biometrie)
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class PinLockScreen extends ConsumerStatefulWidget {
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const PinLockScreen({super.key});
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@override
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ConsumerState<PinLockScreen> createState() => _PinLockScreenState();
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}
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class _PinLockScreenState extends ConsumerState<PinLockScreen> {
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String _pin = '';
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String? _error;
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bool _isVerifying = false;
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bool _biometricsAvailable = false;
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@override
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void initState() {
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super.initState();
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// Biometrie zapnutá → rovnou nabídnout systémovou výzvu
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WidgetsBinding.instance.addPostFrameCallback((_) => _tryBiometrics());
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}
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Future<void> _tryBiometrics() async {
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final unlockReason = context.l10n.pinUnlockTitle;
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final storage = ref.read(storageProvider);
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if (!await storage.isBiometricsEnabled()) return;
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if (mounted) setState(() => _biometricsAvailable = true);
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try {
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final ok = await LocalAuthentication().authenticate(
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localizedReason: unlockReason,
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options: const AuthenticationOptions(stickyAuth: true),
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);
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if (!ok) return; // uživatel zrušil → zůstává PIN
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await storage.unlockWithBiometrics();
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if (mounted) context.go('/chats');
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} catch (_) {
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// biometrie nedostupná/selhala — PIN je vždy fallback
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: SafeArea(
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child: Padding(
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padding: const EdgeInsets.all(32),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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const SepotLogo(size: 60, showText: false),
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const SizedBox(height: 24),
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Text(
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context.l10n.pinUnlockTitle,
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style: const TextStyle(
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fontFamily: kFontSans,
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fontSize: 24,
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fontWeight: FontWeight.w700,
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color: SepotColors.textPrimary,
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),
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),
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const SizedBox(height: 8),
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Text(
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context.l10n.pinEnterPin,
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style: const TextStyle(color: SepotColors.textSecondary),
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),
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const SizedBox(height: 48),
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// PIN tečky
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Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: List.generate(6, (i) {
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return Container(
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width: 16,
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height: 16,
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margin: const EdgeInsets.symmetric(horizontal: 8),
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: i < _pin.length
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? SepotColors.ember
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: SepotColors.border,
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),
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);
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}),
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),
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if (_error != null) ...[
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const SizedBox(height: 16),
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Text(
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_error!,
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style: const TextStyle(color: SepotColors.error, fontSize: 14),
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),
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],
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if (_isVerifying) ...[
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const SizedBox(height: 16),
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const SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(
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strokeWidth: 2,
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color: SepotColors.ember,
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),
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),
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],
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const SizedBox(height: 48),
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_buildNumpad(),
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if (_biometricsAvailable) ...[
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const SizedBox(height: 16),
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TextButton.icon(
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onPressed: _isVerifying ? null : _tryBiometrics,
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icon: const Icon(Icons.fingerprint,
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color: SepotColors.ember),
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label: Text(
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context.l10n.pinUnlockWithBiometrics,
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style: const TextStyle(color: SepotColors.textSecondary),
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),
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),
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],
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],
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),
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),
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),
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);
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}
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Widget _buildNumpad() {
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return Column(
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children: [
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for (final row in [
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['1', '2', '3'],
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['4', '5', '6'],
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['7', '8', '9'],
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['', '0', 'DEL'],
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])
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 8),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: row.map((key) {
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if (key.isEmpty) return const SizedBox(width: 80, height: 64);
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return _buildKey(key);
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}).toList(),
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),
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),
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],
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);
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}
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Widget _buildKey(String key) {
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final isDelete = key == 'DEL';
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return Padding(
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padding: const EdgeInsets.symmetric(horizontal: 12),
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child: InkWell(
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onTap: () => _onKeyPress(key),
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borderRadius: BorderRadius.circular(32),
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child: Container(
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width: 64,
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height: 64,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: isDelete ? Colors.transparent : SepotColors.surfaceVariant,
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border: isDelete ? null : Border.all(color: SepotColors.border),
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),
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child: Center(
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child: isDelete
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? const Icon(
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Icons.backspace_outlined,
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color: SepotColors.textSecondary,
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size: 24,
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)
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: Text(
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key,
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style: const TextStyle(
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fontFamily: kFontSans,
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fontSize: 24,
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fontWeight: FontWeight.w500,
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color: SepotColors.textPrimary,
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
);
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}
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|
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void _onKeyPress(String key) {
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if (_isVerifying) return;
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HapticFeedback.lightImpact();
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setState(() {
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_error = null;
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if (key == 'DEL') {
|
||||
if (_pin.isNotEmpty) {
|
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_pin = _pin.substring(0, _pin.length - 1);
|
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}
|
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} else if (_pin.length < 6) {
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_pin += key;
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if (_pin.length == 6) {
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||||
_verifyPin();
|
||||
}
|
||||
}
|
||||
});
|
||||
}
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Future<void> _verifyPin() async {
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setState(() => _isVerifying = true);
|
||||
|
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try {
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// „Ověření" PINu = Argon2id unwrap DEK + otevření SQLCipher DB.
|
||||
// Špatný PIN = GCM tag nesedí = DB zůstává nečitelná.
|
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await ref.read(storageProvider).unlockWithPin(_pin);
|
||||
if (mounted) context.go('/chats');
|
||||
} on WrongPinException {
|
||||
setState(() {
|
||||
_error = context.l10n.pinWrong2;
|
||||
_pin = '';
|
||||
_isVerifying = false;
|
||||
});
|
||||
HapticFeedback.heavyImpact();
|
||||
} on StateError {
|
||||
// Wrapped DEK neexistuje — nekonzistentní stav, zpět na onboarding
|
||||
if (mounted) context.go('/onboarding');
|
||||
} catch (e) {
|
||||
setState(() {
|
||||
_error = context.l10n.pinUnlockError;
|
||||
_pin = '';
|
||||
_isVerifying = false;
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,253 @@
|
||||
import 'package:flutter/material.dart';
|
||||
import 'package:flutter/services.dart';
|
||||
import 'package:flutter_riverpod/flutter_riverpod.dart';
|
||||
import 'package:go_router/go_router.dart';
|
||||
import 'package:sepot/core/l10n/l10n.dart';
|
||||
import 'package:sepot/core/theme/app_theme.dart';
|
||||
import 'package:sepot/providers/storage_provider.dart';
|
||||
|
||||
/// Nastavení PINu (6 číslic)
|
||||
class PinSetupScreen extends ConsumerStatefulWidget {
|
||||
const PinSetupScreen({super.key});
|
||||
|
||||
@override
|
||||
ConsumerState<PinSetupScreen> createState() => _PinSetupScreenState();
|
||||
}
|
||||
|
||||
class _PinSetupScreenState extends ConsumerState<PinSetupScreen> {
|
||||
String _pin = '';
|
||||
String? _firstPin;
|
||||
bool _isConfirming = false;
|
||||
bool _isSaving = false;
|
||||
String? _error;
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return Scaffold(
|
||||
body: SafeArea(
|
||||
child: Padding(
|
||||
padding: const EdgeInsets.all(32),
|
||||
child: Column(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
children: [
|
||||
Container(
|
||||
width: 64,
|
||||
height: 64,
|
||||
decoration: BoxDecoration(
|
||||
shape: BoxShape.circle,
|
||||
color: SepotColors.ember.withValues(alpha: 0.1),
|
||||
),
|
||||
child: const Icon(
|
||||
Icons.pin_rounded,
|
||||
size: 32,
|
||||
color: SepotColors.ember,
|
||||
),
|
||||
),
|
||||
const SizedBox(height: 24),
|
||||
Text(
|
||||
_isConfirming
|
||||
? context.l10n.pinConfirmTitle
|
||||
: context.l10n.pinSetupTitle,
|
||||
style: const TextStyle(
|
||||
fontFamily: kFontSans,
|
||||
fontSize: 24,
|
||||
fontWeight: FontWeight.w700,
|
||||
color: SepotColors.textPrimary,
|
||||
),
|
||||
),
|
||||
const SizedBox(height: 8),
|
||||
Text(
|
||||
_isConfirming
|
||||
? context.l10n.pinConfirmSubtitle
|
||||
: context.l10n.pinSetupSubtitle,
|
||||
style: const TextStyle(
|
||||
fontSize: 14,
|
||||
color: SepotColors.textSecondary,
|
||||
),
|
||||
),
|
||||
const SizedBox(height: 48),
|
||||
// PIN tečky
|
||||
Row(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
children: List.generate(6, (i) {
|
||||
return Container(
|
||||
width: 16,
|
||||
height: 16,
|
||||
margin: const EdgeInsets.symmetric(horizontal: 8),
|
||||
decoration: BoxDecoration(
|
||||
shape: BoxShape.circle,
|
||||
color: i < _pin.length
|
||||
? SepotColors.ember
|
||||
: SepotColors.border,
|
||||
border: Border.all(
|
||||
color: i < _pin.length
|
||||
? SepotColors.ember
|
||||
: SepotColors.border,
|
||||
width: 2,
|
||||
),
|
||||
),
|
||||
);
|
||||
}),
|
||||
),
|
||||
if (_error != null) ...[
|
||||
const SizedBox(height: 16),
|
||||
Text(
|
||||
_error!,
|
||||
style: const TextStyle(
|
||||
color: SepotColors.error,
|
||||
fontSize: 14,
|
||||
),
|
||||
),
|
||||
],
|
||||
if (_isSaving) ...[
|
||||
const SizedBox(height: 16),
|
||||
// Argon2id wrap DEK běží (~sekundy, memory-hard záměrně)
|
||||
const SizedBox(
|
||||
width: 20,
|
||||
height: 20,
|
||||
child: CircularProgressIndicator(
|
||||
strokeWidth: 2,
|
||||
color: SepotColors.ember,
|
||||
),
|
||||
),
|
||||
],
|
||||
const SizedBox(height: 48),
|
||||
// Numerická klávesnice
|
||||
_buildNumpad(),
|
||||
],
|
||||
),
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
|
||||
Widget _buildNumpad() {
|
||||
return Column(
|
||||
children: [
|
||||
for (final row in [
|
||||
['1', '2', '3'],
|
||||
['4', '5', '6'],
|
||||
['7', '8', '9'],
|
||||
['', '0', 'DEL'],
|
||||
])
|
||||
Padding(
|
||||
padding: const EdgeInsets.symmetric(vertical: 8),
|
||||
child: Row(
|
||||
mainAxisAlignment: MainAxisAlignment.center,
|
||||
children: row.map((key) {
|
||||
if (key.isEmpty) {
|
||||
return const SizedBox(width: 80, height: 64);
|
||||
}
|
||||
return _buildKey(key);
|
||||
}).toList(),
|
||||
),
|
||||
),
|
||||
],
|
||||
);
|
||||
}
|
||||
|
||||
Widget _buildKey(String key) {
|
||||
final isDelete = key == 'DEL';
|
||||
|
||||
return Padding(
|
||||
padding: const EdgeInsets.symmetric(horizontal: 12),
|
||||
child: InkWell(
|
||||
onTap: () => _onKeyPress(key),
|
||||
borderRadius: BorderRadius.circular(32),
|
||||
child: Container(
|
||||
width: 64,
|
||||
height: 64,
|
||||
decoration: BoxDecoration(
|
||||
shape: BoxShape.circle,
|
||||
color: isDelete
|
||||
? Colors.transparent
|
||||
: SepotColors.surfaceVariant,
|
||||
border: isDelete
|
||||
? null
|
||||
: Border.all(color: SepotColors.border),
|
||||
),
|
||||
child: Center(
|
||||
child: isDelete
|
||||
? const Icon(
|
||||
Icons.backspace_outlined,
|
||||
color: SepotColors.textSecondary,
|
||||
size: 24,
|
||||
)
|
||||
: Text(
|
||||
key,
|
||||
style: const TextStyle(
|
||||
fontFamily: kFontSans,
|
||||
fontSize: 24,
|
||||
fontWeight: FontWeight.w500,
|
||||
color: SepotColors.textPrimary,
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
|
||||
void _onKeyPress(String key) {
|
||||
if (_isSaving) return;
|
||||
HapticFeedback.lightImpact();
|
||||
|
||||
setState(() {
|
||||
_error = null;
|
||||
|
||||
if (key == 'DEL') {
|
||||
if (_pin.isNotEmpty) {
|
||||
_pin = _pin.substring(0, _pin.length - 1);
|
||||
}
|
||||
} else if (_pin.length < 6) {
|
||||
_pin += key;
|
||||
|
||||
if (_pin.length == 6) {
|
||||
_onPinComplete();
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
Future<void> _onPinComplete() async {
|
||||
if (_firstPin == null) {
|
||||
// První zadání PINu
|
||||
setState(() {
|
||||
_firstPin = _pin;
|
||||
_pin = '';
|
||||
_isConfirming = true;
|
||||
});
|
||||
} else {
|
||||
// Potvrzení PINu
|
||||
if (_pin == _firstPin) {
|
||||
// PINy se shodují — zabal DEK za Argon2id(PIN); od téhle chvíle
|
||||
// je PIN klíčem k databázi, ne vizuálním zámkem
|
||||
setState(() => _isSaving = true);
|
||||
try {
|
||||
await ref.read(storageProvider).enablePin(_pin);
|
||||
} catch (e) {
|
||||
setState(() {
|
||||
_error = context.l10n.pinSetupFailed;
|
||||
_pin = '';
|
||||
_firstPin = null;
|
||||
_isConfirming = false;
|
||||
_isSaving = false;
|
||||
});
|
||||
return;
|
||||
}
|
||||
|
||||
if (mounted) {
|
||||
context.go('/chats');
|
||||
}
|
||||
} else {
|
||||
// PINy se neshodují
|
||||
setState(() {
|
||||
_error = context.l10n.pinMismatchRetry;
|
||||
_pin = '';
|
||||
_firstPin = null;
|
||||
_isConfirming = false;
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user