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 +1,520 @@
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/// Obsah bublin s přílohou — obrázek (thumbnail + stav) a dokument
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/// (karta s názvem/velikostí). Plné rozlišení se dešifruje až ve vieweru;
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/// v chatu stačí inline náhled, který dorazil UVNITŘ E2E zprávy.
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library;
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import 'dart:async';
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import 'dart:typed_data';
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import 'package:audioplayers/audioplayers.dart';
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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: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/features/conversation/image_viewer_screen.dart';
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import 'package:sepot/models/attachment.dart';
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import 'package:sepot/models/message.dart';
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import 'package:sepot/providers/conversations_provider.dart';
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import 'package:sepot/providers/messaging_provider.dart';
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import 'package:share_plus/share_plus.dart';
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String formatBytes(AppLocalizations l10n, int bytes) {
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if (bytes < 1024) return l10n.attachmentSizeBytes(bytes);
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if (bytes < 1024 * 1024) {
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return l10n.attachmentSizeKb((bytes / 1024).toStringAsFixed(0));
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}
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return l10n.attachmentSizeMb((bytes / (1024 * 1024)).toStringAsFixed(1));
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}
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/// Cache dešifrovaných plných obrázků (blob_id → bajty), ať se nedešifruje
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/// při každém překreslení seznamu. Prostý strop, nejstarší se zahazují.
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final _fullImageCache = <String, Uint8List>{};
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const _fullImageCacheMax = 30;
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void _cachePut(String blobId, Uint8List bytes) {
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_fullImageCache.remove(blobId);
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_fullImageCache[blobId] = bytes;
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while (_fullImageCache.length > _fullImageCacheMax) {
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_fullImageCache.remove(_fullImageCache.keys.first);
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}
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}
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/// Obrázková příloha: náhled + overlay podle stavu přenosu.
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class ImageAttachmentContent extends ConsumerWidget {
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const ImageAttachmentContent({
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super.key,
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required this.contactId,
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required this.message,
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});
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final String contactId;
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final Message message;
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final meta = message.attachment!;
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final thumb = meta.thumbnail;
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final aspect = (meta.width != null &&
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meta.height != null &&
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meta.width! > 0 &&
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meta.height! > 0)
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? meta.width! / meta.height!
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: 4 / 3;
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return GestureDetector(
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onTap: switch (meta.state) {
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AttachmentTransferState.ready => () {
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Navigator.of(context).push(
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MaterialPageRoute<void>(
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builder: (_) => ImageViewerScreen(message: message),
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),
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);
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},
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AttachmentTransferState.failed => () => ref
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.read(conversationsProvider.notifier)
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.retryAttachmentDownload(contactId, message),
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_ => null,
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},
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child: ClipRRect(
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borderRadius: BorderRadius.circular(12),
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child: AspectRatio(
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aspectRatio: aspect.clamp(0.5, 2.5),
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child: Stack(
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fit: StackFit.expand,
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children: [
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// Náhled jako podklad/placeholder (rozmazaný, ne kostičkovaný).
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// Klíč podle blob_id — jinak ListView recykluje widget a
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// s gaplessPlayback ukáže náhled PŘEDCHOZÍ fotky.
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if (thumb != null)
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Image.memory(thumb,
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key: ValueKey('thumb-${meta.blobId}'),
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fit: BoxFit.cover,
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gaplessPlayback: true)
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else
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const ColoredBox(
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color: SepotColors.surfaceVariant,
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child: Icon(Icons.image_outlined,
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size: 48, color: SepotColors.textMuted),
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),
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// Jakmile je blob stažený, překryj OSTROU plnou fotkou.
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// Klíč podle blob_id, ať se stav nedědí z jiné fotky.
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if (meta.state == AttachmentTransferState.ready)
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_FullImage(
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key: ValueKey('full-${meta.blobId}'),
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contactId: contactId,
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message: message),
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if (meta.state != AttachmentTransferState.ready)
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ColoredBox(
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color: Colors.black45,
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child: Center(child: _stateIndicator(context, meta.state)),
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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 _stateIndicator(BuildContext context, AttachmentTransferState state) {
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return switch (state) {
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AttachmentTransferState.downloading ||
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AttachmentTransferState.pending =>
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const SizedBox(
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width: 32,
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height: 32,
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child: CircularProgressIndicator(
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strokeWidth: 2.5,
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color: Colors.white,
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),
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),
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AttachmentTransferState.failed => Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.refresh_rounded, color: Colors.white, size: 32),
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const SizedBox(height: 4),
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Text(
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context.l10n.attachmentDownloadFailedTapToRetry,
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textAlign: TextAlign.center,
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style: const TextStyle(color: Colors.white, fontSize: 11),
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),
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],
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),
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AttachmentTransferState.ready => const SizedBox.shrink(),
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};
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}
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}
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/// Ostrá plná fotka do bubliny (stav ready). Dešifruje blob do paměti
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/// s cache; než je hotová, prosvítá náhled pod ní (žádné kostičky).
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class _FullImage extends ConsumerStatefulWidget {
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const _FullImage(
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{super.key, required this.contactId, required this.message});
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final String contactId;
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final Message message;
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@override
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ConsumerState<_FullImage> createState() => _FullImageState();
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}
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class _FullImageState extends ConsumerState<_FullImage> {
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Uint8List? _bytes;
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@override
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void initState() {
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super.initState();
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_load();
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}
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@override
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void didUpdateWidget(_FullImage old) {
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super.didUpdateWidget(old);
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// Kdyby se widget přece jen recykloval na jinou fotku (jiný blob_id),
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// zahoď staré bajty a načti čerstvě — žádné zděděné náhledy.
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if (old.message.attachment!.blobId != widget.message.attachment!.blobId) {
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_bytes = null;
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_load();
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}
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}
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Future<void> _load() async {
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final blobId = widget.message.attachment!.blobId;
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final cached = _fullImageCache[blobId];
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if (cached != null) {
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setState(() => _bytes = cached);
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return;
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}
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final bytes = await ref
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.read(messagingServiceProvider)
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.loadDecryptedAttachment(widget.message);
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if (bytes != null) _cachePut(blobId, bytes);
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if (mounted) setState(() => _bytes = bytes);
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}
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@override
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Widget build(BuildContext context) {
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final bytes = _bytes;
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if (bytes == null) return const SizedBox.shrink();
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return Image.memory(bytes, fit: BoxFit.cover, gaplessPlayback: true);
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}
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}
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/// Hlasová zpráva: play/pause, průběh a délka. Blob se dešifruje do paměti
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/// až při prvním přehrání (plaintext audio nikdy nejde na disk).
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class AudioAttachmentContent extends ConsumerStatefulWidget {
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const AudioAttachmentContent({
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super.key,
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required this.contactId,
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required this.message,
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required this.isMine,
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});
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final String contactId;
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final Message message;
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final bool isMine;
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@override
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ConsumerState<AudioAttachmentContent> createState() => _AudioState();
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}
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class _AudioState extends ConsumerState<AudioAttachmentContent> {
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final _player = AudioPlayer();
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final _subs = <StreamSubscription<dynamic>>[];
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bool _loading = false;
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bool _playing = false;
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Duration _pos = Duration.zero;
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Duration? _total;
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@override
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void initState() {
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super.initState();
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final dur = widget.message.attachment!.durationMs;
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_total = dur != null ? Duration(milliseconds: dur) : null;
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_subs.add(_player.onPositionChanged.listen((p) {
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if (mounted) setState(() => _pos = p);
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}));
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_subs.add(_player.onDurationChanged.listen((d) {
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if (mounted && d > Duration.zero) setState(() => _total = d);
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}));
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_subs.add(_player.onPlayerStateChanged.listen((s) {
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if (mounted) setState(() => _playing = s == PlayerState.playing);
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}));
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_subs.add(_player.onPlayerComplete.listen((_) {
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if (mounted) setState(() => _pos = Duration.zero);
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}));
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}
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@override
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void dispose() {
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for (final s in _subs) {
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s.cancel();
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}
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_player.dispose();
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super.dispose();
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}
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String _fmt(Duration d) {
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final m = d.inMinutes.remainder(60).toString();
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final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
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return '$m:$s';
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}
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Future<void> _toggle() async {
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final meta = widget.message.attachment!;
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if (_playing) {
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await _player.pause();
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return;
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}
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if (_pos > Duration.zero && _pos < (_total ?? Duration.zero)) {
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await _player.resume();
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return;
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}
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setState(() => _loading = true);
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final bytes = await ref
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.read(messagingServiceProvider)
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.loadDecryptedAttachment(widget.message);
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if (!mounted) return;
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setState(() => _loading = false);
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if (bytes == null) return;
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await _player.play(BytesSource(bytes, mimeType: meta.mime));
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}
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@override
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Widget build(BuildContext context) {
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final meta = widget.message.attachment!;
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final ink = widget.isMine ? SepotColors.emberInk : SepotColors.textPrimary;
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final accent = widget.isMine ? SepotColors.emberInk : SepotColors.ember;
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if (meta.state != AttachmentTransferState.ready) {
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return SizedBox(
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width: 200,
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child: Row(
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children: [
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const SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(strokeWidth: 2),
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),
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const SizedBox(width: 10),
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Text(
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meta.state == AttachmentTransferState.failed
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? context.l10n.attachmentDownloadFailed
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: context.l10n.attachmentDownloading,
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style: TextStyle(color: ink, fontSize: 13),
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),
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],
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),
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);
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}
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final total = _total ?? Duration.zero;
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final progress = total.inMilliseconds == 0
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? 0.0
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: (_pos.inMilliseconds / total.inMilliseconds).clamp(0.0, 1.0);
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return SizedBox(
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width: 210,
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child: Row(
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children: [
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GestureDetector(
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onTap: _loading ? null : _toggle,
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child: Container(
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width: 40,
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height: 40,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: accent.withValues(alpha: 0.18),
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),
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child: _loading
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? Padding(
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padding: const EdgeInsets.all(10),
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child: CircularProgressIndicator(
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strokeWidth: 2, color: accent),
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)
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: Icon(_playing ? Icons.pause : Icons.play_arrow,
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color: accent, size: 24),
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),
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),
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const SizedBox(width: 10),
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Expanded(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.start,
|
||||
children: [
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ClipRRect(
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||||
borderRadius: BorderRadius.circular(4),
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child: LinearProgressIndicator(
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value: progress,
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minHeight: 4,
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backgroundColor: ink.withValues(alpha: 0.2),
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valueColor: AlwaysStoppedAnimation(accent),
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),
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),
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const SizedBox(height: 4),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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Icon(Icons.mic, size: 13, color: ink.withValues(alpha: .6)),
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Text(
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_playing || _pos > Duration.zero
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? _fmt(_pos)
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: _fmt(total),
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style: TextStyle(
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||||
fontSize: 11, color: ink.withValues(alpha: .8)),
|
||||
),
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||||
],
|
||||
),
|
||||
],
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||||
),
|
||||
),
|
||||
],
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
||||
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/// Dokument: karta s ikonou, názvem a velikostí. Klepnutí (stav ready)
|
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/// dešifruje do paměti a otevře systémový share sheet — plaintext se na
|
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/// disk dostane jen do cache sdílení (spravuje OS), nikdy do galerie.
|
||||
class DocumentAttachmentContent extends ConsumerStatefulWidget {
|
||||
const DocumentAttachmentContent({
|
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super.key,
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required this.contactId,
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required this.message,
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||||
});
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|
||||
final String contactId;
|
||||
final Message message;
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||||
|
||||
@override
|
||||
ConsumerState<DocumentAttachmentContent> createState() =>
|
||||
_DocumentAttachmentContentState();
|
||||
}
|
||||
|
||||
class _DocumentAttachmentContentState
|
||||
extends ConsumerState<DocumentAttachmentContent> {
|
||||
bool _opening = false;
|
||||
|
||||
Future<void> _open() async {
|
||||
final meta = widget.message.attachment!;
|
||||
final l10n = context.l10n;
|
||||
setState(() => _opening = true);
|
||||
try {
|
||||
final bytes = await ref
|
||||
.read(messagingServiceProvider)
|
||||
.loadDecryptedAttachment(widget.message);
|
||||
if (bytes == null) return;
|
||||
await Share.shareXFiles([
|
||||
XFile.fromData(
|
||||
bytes,
|
||||
name: meta.name ?? l10n.attachmentSharedFileFallbackName,
|
||||
mimeType: meta.mime,
|
||||
),
|
||||
]);
|
||||
} catch (e) {
|
||||
if (mounted) {
|
||||
ScaffoldMessenger.of(context).showSnackBar(
|
||||
SnackBar(
|
||||
content:
|
||||
Text(l10n.attachmentOpenFailed(describeError(l10n, e)))),
|
||||
);
|
||||
}
|
||||
} finally {
|
||||
if (mounted) setState(() => _opening = false);
|
||||
}
|
||||
}
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
final meta = widget.message.attachment!;
|
||||
|
||||
return InkWell(
|
||||
onTap: switch (meta.state) {
|
||||
AttachmentTransferState.ready => _opening ? null : _open,
|
||||
AttachmentTransferState.failed => () => ref
|
||||
.read(conversationsProvider.notifier)
|
||||
.retryAttachmentDownload(widget.contactId, widget.message),
|
||||
_ => null,
|
||||
},
|
||||
borderRadius: BorderRadius.circular(12),
|
||||
child: Container(
|
||||
padding: const EdgeInsets.all(10),
|
||||
decoration: BoxDecoration(
|
||||
color: Colors.black.withValues(alpha: 0.15),
|
||||
borderRadius: BorderRadius.circular(12),
|
||||
),
|
||||
child: Row(
|
||||
mainAxisSize: MainAxisSize.min,
|
||||
children: [
|
||||
_leadingIcon(meta.state),
|
||||
const SizedBox(width: 10),
|
||||
Flexible(
|
||||
child: Column(
|
||||
crossAxisAlignment: CrossAxisAlignment.start,
|
||||
mainAxisSize: MainAxisSize.min,
|
||||
children: [
|
||||
Text(
|
||||
meta.name ?? context.l10n.commonFile,
|
||||
maxLines: 1,
|
||||
overflow: TextOverflow.ellipsis,
|
||||
style: const TextStyle(
|
||||
fontSize: 14,
|
||||
fontWeight: FontWeight.w600,
|
||||
color: SepotColors.textPrimary,
|
||||
),
|
||||
),
|
||||
const SizedBox(height: 2),
|
||||
Text(
|
||||
meta.state == AttachmentTransferState.failed
|
||||
? context.l10n.attachmentDownloadFailedTapToRetry
|
||||
: formatBytes(context.l10n, meta.size),
|
||||
style: const TextStyle(
|
||||
fontSize: 12,
|
||||
color: SepotColors.textMuted,
|
||||
),
|
||||
),
|
||||
],
|
||||
),
|
||||
),
|
||||
],
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
|
||||
Widget _leadingIcon(AttachmentTransferState state) {
|
||||
const size = 38.0;
|
||||
if (_opening ||
|
||||
state == AttachmentTransferState.downloading ||
|
||||
state == AttachmentTransferState.pending) {
|
||||
return const SizedBox(
|
||||
width: size,
|
||||
height: size,
|
||||
child: Padding(
|
||||
padding: EdgeInsets.all(8),
|
||||
child: CircularProgressIndicator(
|
||||
strokeWidth: 2,
|
||||
color: SepotColors.ember,
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
return Container(
|
||||
width: size,
|
||||
height: size,
|
||||
decoration: BoxDecoration(
|
||||
color: SepotColors.ember.withValues(alpha: 0.15),
|
||||
borderRadius: BorderRadius.circular(10),
|
||||
),
|
||||
child: Icon(
|
||||
state == AttachmentTransferState.failed
|
||||
? Icons.refresh_rounded
|
||||
: Icons.description_outlined,
|
||||
color: SepotColors.ember,
|
||||
size: 20,
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user