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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+/// Skupina — párový fanout MVP.
+///
+/// Drží jen jméno a fingerprinty členů; routing a identity klíče členů
+/// žijí v tabulce contacts (člen = běžný kontakt založený z rosteru).
+/// Konverzace skupiny je řádek v conversations s contact_id = [id].
+class Group {
+  Group({
+    required this.id,
+    required this.name,
+    required this.memberIds,
+    required this.createdBy,
+    DateTime? createdAt,
+    this.left = false,
+  }) : createdAt = createdAt ?? DateTime.now();
+
+  /// UUID v4 skupiny (= `gid` na drátu, = contact_id konverzace).
+  final String id;
+
+  String name;
+
+  /// Fingerprinty členů VČETNĚ mě (kompletní roster).
+  List<String> memberIds;
+
+  /// Fingerprint zakladatele.
+  final String createdBy;
+
+  final DateTime createdAt;
+
+  /// Opustil jsem skupinu — historie zůstává, vstup je mrtvý a příchozí
+  /// zprávy skupiny se zahazují.
+  bool left;
+
+  /// Strop členů (doporučení: 128).
+  static const maxMembers = 128;
+
+  bool isMember(String fingerprint) => memberIds.contains(fingerprint);
+
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'name': name,
+        'memberIds': memberIds,
+        'createdBy': createdBy,
+        'createdAt': createdAt.toIso8601String(),
+        'left': left,
+      };
+
+  factory Group.fromJson(Map<String, dynamic> json) => Group(
+        id: json['id'] as String,
+        name: json['name'] as String,
+        memberIds:
+            (json['memberIds'] as List<dynamic>).cast<String>().toList(),
+        createdBy: json['createdBy'] as String,
+        createdAt: DateTime.parse(json['createdAt'] as String),
+        left: json['left'] as bool? ?? false,
+      );
+}