chat_join: модуль join-протокола, invite-ссылки v2, синхронизация мемберов

tools/chatgui/src/invite_link.cpp

@@ -116,6 +116,17 @@ InviteData decodeInviteLink(const QString& link) {
         chId = (chId << 8) | data[off++];
     d.channelId = chId;
 
+    /* join_key: uint64 big-endian */
+    if (off + 8 > len) {
+        d.error = QStringLiteral("truncated at join_key");
+        GUI_ERROR("decodeInviteLink: truncated at join_key");
+        return d;
+    }
+    uint64_t jk = 0;
+    for (int i = 0; i < 8; i++)
+        jk = (jk << 8) | data[off++];
+    d.joinKey = jk;
+
     bool firstBlock = true;
     while (off + 1 <= len) {
         uint8_t header = data[off++];