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
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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:mobile_scanner/mobile_scanner.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/theme/app_theme.dart';
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import 'package:sepot/models/identity.dart';
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import 'package:sepot/providers/contacts_provider.dart';
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/// QR skener pro přidání kontaktů
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class QrScanScreen extends ConsumerStatefulWidget {
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const QrScanScreen({super.key});
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@override
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ConsumerState<QrScanScreen> createState() => _QrScanScreenState();
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}
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class _QrScanScreenState extends ConsumerState<QrScanScreen> {
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final _controller = MobileScannerController(
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detectionSpeed: DetectionSpeed.normal,
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facing: CameraFacing.back,
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);
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bool _isProcessing = false;
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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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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appBar: AppBar(
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title: Text(context.l10n.qrScanTitle),
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actions: [
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IconButton(
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icon: const Icon(Icons.flash_on),
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onPressed: () => _controller.toggleTorch(),
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),
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IconButton(
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icon: const Icon(Icons.cameraswitch),
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onPressed: () => _controller.switchCamera(),
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),
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],
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),
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body: Stack(
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children: [
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MobileScanner(
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controller: _controller,
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onDetect: _onDetect,
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),
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// Overlay
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_buildOverlay(),
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// Spodní panel
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Positioned(
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bottom: 0,
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left: 0,
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right: 0,
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child: Container(
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padding: const EdgeInsets.all(24),
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.transparent,
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SepotColors.background.withValues(alpha: 0.9),
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SepotColors.background,
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],
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),
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),
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child: SafeArea(
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top: false,
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(
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Icons.qr_code_scanner_rounded,
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color: SepotColors.ember,
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size: 32,
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),
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const SizedBox(height: 8),
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Text(
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context.l10n.qrScanInstruction,
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style: const TextStyle(
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fontSize: 16,
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color: SepotColors.textPrimary,
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fontWeight: FontWeight.w500,
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),
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),
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const SizedBox(height: 4),
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Text(
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context.l10n.qrScanHint,
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style: const TextStyle(
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fontSize: 13,
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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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);
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}
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Widget _buildOverlay() {
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return LayoutBuilder(
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builder: (context, constraints) {
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final scanSize = constraints.maxWidth * 0.7;
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final left = (constraints.maxWidth - scanSize) / 2;
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final top = (constraints.maxHeight - scanSize) / 2 - 40;
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return Stack(
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children: [
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// Tmavý overlay kolem
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ColorFiltered(
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colorFilter: ColorFilter.mode(
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SepotColors.background.withValues(alpha: 0.5),
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BlendMode.srcOut,
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),
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child: Stack(
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children: [
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Container(
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decoration: const BoxDecoration(
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color: Colors.red, // Jakákoliv neprůhledná barva
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backgroundBlendMode: BlendMode.dstOut,
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),
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),
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Positioned(
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left: left,
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top: top,
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child: Container(
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width: scanSize,
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height: scanSize,
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decoration: BoxDecoration(
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color: Colors.red,
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borderRadius: BorderRadius.circular(24),
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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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// Rámec skenu
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Positioned(
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left: left,
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top: top,
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child: Container(
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width: scanSize,
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height: scanSize,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(24),
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border: Border.all(
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color: SepotColors.ember,
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width: 3,
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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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void _onDetect(BarcodeCapture capture) {
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if (_isProcessing) return;
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final barcode = capture.barcodes.firstOrNull;
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if (barcode?.rawValue == null) return;
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final shareString = barcode!.rawValue!;
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final identity = PublicIdentity.fromShareString(shareString);
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if (identity == null) return;
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setState(() => _isProcessing = true);
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_controller.stop();
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_showContactConfirmation(identity);
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}
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void _showContactConfirmation(PublicIdentity identity) {
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showDialog(
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context: context,
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barrierDismissible: false,
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builder: (ctx) => AlertDialog(
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title: Text(context.l10n.qrNewContactTitle),
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content: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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CircleAvatar(
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radius: 32,
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backgroundColor: SepotColors.ember.withValues(alpha: 0.1),
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child: Text(
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// Naskenovaná identita může mít prázdný displayName
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// (i podvržený QR); guard proti pádu na substring(0,1).
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identity.displayName.isNotEmpty
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? identity.displayName.substring(0, 1).toUpperCase()
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: '?',
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style: const TextStyle(
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fontSize: 24,
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fontWeight: FontWeight.w600,
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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: 16),
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Text(
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identity.displayName,
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style: const TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.w600,
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),
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),
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const SizedBox(height: 4),
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Text(
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identity.sepotId,
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style: SepotTheme.cryptoText,
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),
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const SizedBox(height: 8),
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Text(
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context.l10n.settingsFingerprint(identity.fingerprint.display),
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style: SepotTheme.cryptoText.copyWith(fontSize: 11),
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),
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],
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),
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actions: [
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TextButton(
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onPressed: () {
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Navigator.of(ctx).pop();
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_controller.start();
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setState(() => _isProcessing = false);
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},
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child: Text(context.l10n.commonCancel),
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),
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ElevatedButton(
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onPressed: () async {
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try {
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await ref
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.read(contactsProvider.notifier)
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.addContact(identity, verified: true);
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if (ctx.mounted) Navigator.of(ctx).pop();
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content:
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Text(context.l10n.qrContactAdded(identity.displayName)),
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),
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);
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context.pop();
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}
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} catch (e) {
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if (ctx.mounted) Navigator.of(ctx).pop();
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text(describeError(context.l10n, e))),
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);
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}
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_controller.start();
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setState(() => _isProcessing = false);
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}
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},
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child: Text(context.l10n.commonAdd),
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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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