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).
2026-07-11 17:06:39 +02:00
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+/// Fullscreen prohlížeč obrázkové přílohy.
+///
+/// Plné rozlišení se dešifruje až tady, do PAMĚTI (na disk nikdy).
+/// FLAG_SECURE platí globálně, takže screenshot/škrcení obrazovky
+/// nehrozí ani ve vieweru. Sdílení jde přes systémový share sheet
+/// (XFile.fromData — plaintext jen v cache sdílení).
+library;
+
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:sepot/core/l10n/l10n.dart';
+import 'package:sepot/core/theme/app_theme.dart';
+import 'package:sepot/models/message.dart';
+import 'package:sepot/providers/messaging_provider.dart';
+import 'package:share_plus/share_plus.dart';
+
+class ImageViewerScreen extends ConsumerStatefulWidget {
+  const ImageViewerScreen({super.key, required this.message});
+
+  final Message message;
+
+  @override
+  ConsumerState<ImageViewerScreen> createState() => _ImageViewerScreenState();
+}
+
+class _ImageViewerScreenState extends ConsumerState<ImageViewerScreen> {
+  late final Future<Uint8List?> _decrypted;
+
+  @override
+  void initState() {
+    super.initState();
+    _decrypted = ref
+        .read(messagingServiceProvider)
+        .loadDecryptedAttachment(widget.message);
+  }
+
+  Future<void> _share() async {
+    final meta = widget.message.attachment!;
+    final ext = meta.mime == 'image/png'
+        ? 'png'
+        : meta.mime == 'image/gif'
+            ? 'gif'
+            : 'jpg';
+    final name = context.l10n.attachmentSharedImageFilename(ext);
+    final bytes = await _decrypted;
+    if (bytes == null) return;
+    await Share.shareXFiles([
+      XFile.fromData(bytes, name: name, mimeType: meta.mime),
+    ]);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      appBar: AppBar(
+        backgroundColor: Colors.black,
+        iconTheme: const IconThemeData(color: Colors.white),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.share_outlined),
+            onPressed: _share,
+          ),
+        ],
+      ),
+      body: FutureBuilder<Uint8List?>(
+        future: _decrypted,
+        builder: (context, snapshot) {
+          if (snapshot.connectionState != ConnectionState.done) {
+            return const Center(
+              child: CircularProgressIndicator(color: SepotColors.ember),
+            );
+          }
+          final bytes = snapshot.data;
+          if (snapshot.hasError || bytes == null) {
+            return Center(
+              child: Text(
+                context.l10n.attachmentDecryptFailed,
+                style: const TextStyle(color: Colors.white70),
+              ),
+            );
+          }
+          return InteractiveViewer(
+            maxScale: 6,
+            child: Center(
+              child: Image.memory(bytes, fit: BoxFit.contain),
+            ),
+          );
+        },
+      ),
+    );
+  }
+}