A group call is N-1 ordinary 1:1 calls, one to each other member, each riding
the pairwise session that member already has — a transport a human already
authenticated by comparing the safety code. No mixer, no SFU, no point at which
two people's media meets anywhere but on a device.
Call control is separate from call media, because the two reach different sets
of people. Who opened a call, who joined and who left travels as group frames
signed with the sender's group identity key, so it reaches members currently
reachable only through a relay — and a relaying member can drop one but cannot
write one. Media flows only where a direct link exists, so a member without one
shows as connecting rather than being omitted. Frames carry a per-sender
sequence checked before the action, so a captured leave cannot end a later call,
and simultaneous calls converge on the lower random call id.
One capture is shared across every leg rather than one getUserMedia per member,
and legs answer without prompting: the flag permitting that is set only locally,
only while this user is in the call, and cleared when they leave.
UI: a gallery that sizes itself from the space it has, a spotlight view, an
active-speaker indicator read from the waveform, and the call surface in the
same visual language as the 1:1 one.
Also in this commit, the v6.5.0 language-suggestion work that had not been
pushed yet; its notes are in the changelog. And two fixes: the safety-code input
asks for digits rather than text, and starting a new chat from inside a group no
longer creates it behind the group where it cannot be seen — which had made it
impossible to connect to anyone new, or to add anyone to a group, while a group
was open.
Claude-Session: https://claude.ai/code/session_01XSxAkET3hQTkYDQfbjCQwZ
Four right-to-left languages at /ar/, /he/, /fa/ and /ur/ — thirteen in all.
The layout no longer has a left and a right, it has a start and an end: the
margins, insets and corners are CSS logical properties now, so they follow
dir on <html>. Directional glyphs flip; keys, safety codes and session
descriptors are pinned left-to-right so bidi cannot reorder what two people
compare against each other's screens.
Also fixed: the Service Worker was registered as './sw.js', which 404s from
every locale subdirectory, so twelve of the thirteen pages had no worker at
all. And the bundler ran before the dictionaries were generated, so a newly
added language could reach the page ahead of the app that renders it.
The site now speaks German, French, Spanish, Ukrainian, Russian, Chinese,
Korean and Hindi alongside English — 623 strings per language, 5,607
translations, covering the landing page, the key exchange, the chat, group
calls and every error along the way.
Each locale is a real page at a real URL (/de/, /fr/, …), generated at build
time from locales/*.json. That is the whole point: the app is client-rendered,
so a language that only swaps strings at runtime has no address for a crawler
to index and no link anyone can share. Each page carries its own canonical, a
reciprocal hreflang cluster and translated schema.org.
The URL decides the language, always. A stored preference only applies where
the address does not say, and nothing ever redirects on Accept-Language —
that is how sites become invisible to search engines outside one country.
robots.txt and sitemap.xml did not exist before; both are generated now.
Bugs found on the way, each with a test that would have caught it:
- partner logos used page-relative paths and 404'd from any /xx/ page
- post-build stamped ?v= only into the root shell, leaving locales behind
- "Back online" appeared on every page load, not just after being offline
- update timestamps were hard-coded to US format for every reader
- t() threw on a partial window, taking whole components down with it
Add 1:1 voice and video calling over the existing SAS-verified peer
connection. Audio and video tracks ride the same RTCPeerConnection as the
chat, bundled onto one DTLS-SRTP transport, so media inherits the session's
end-to-end encryption. SDP offer/answer is renegotiated in-band over the
verified data channel — no signalling server, so the media's DTLS
fingerprints are authenticated end-to-end. Calls are gated on a connected,
SAS-verified session.
Codecs & adaptation:
- Opus tuned for lossy links (in-band FEC, DTX, RED redundancy); audio is
bandwidth-prioritised and never throttled.
- VP9/AV1 single-encoding SVC with H.264/VP8 fallback; video degrades by
spatial/temporal layer.
- Runtime NetworkAdaptationController trims video bitrate on loss/RTT and
recovers as the link clears — no renegotiation. Live connection-quality
indicator (Excellent/Good/Fair/Weak) in the call UI.
In-call controls: mute, camera on/off (voice→video upgrade in-band),
camera flip, minimize-to-widget, hang up, and accept/decline for incoming
calls. Production logging disabled (DEBUG_MODE=false); temporary call
diagnostic logger removed. Codec rationale in docs/webrtc-config.md.
- config/ice-servers.prod.js: swap ExpressTURN for self-hosted coturn at
turn.securebit.chat (TURN udp/tcp on 3478, TURNS/TLS on 443). Long-lived
REST-API credential (expiry capped at int32 max for coturn compatibility).
- Add raw-IP STUN/TURN fallback (144.172.96.126): Safari's WebRTC layer fails
to resolve STUN/TURN hostnames on some networks and gathers no srflx/relay
candidates; reaching the server by IP fixes cross-browser (Safari<->Chrome)
connections. Harmless to other browsers.
- deploy/nginx.conf: never long-cache /config/ice-servers.js so clients don't
lock onto a stale server list.
- Bump version to 5.4.10 (header + init banner).
- Record voice notes in-browser, sent over the chunked AES-GCM file-transfer
channel (per-file session key + signed SHA-256 integrity).
- Captured as PCM and encoded to WAV for universal playback (incl. iOS/Safari);
auto-accepted and played inline from an in-memory blob, never written to disk.
- Composer mic button with live waveform + timer; desktop shows mic + send side
by side, mobile swaps mic to send when typing.
- CSP media-src now allows blob: so recorded/received audio can play.
- Roadmap: Desktop Edition -> 5.0, new 5.5 'Secure Voice & Calls', later
milestones shifted; version bumped to 5.4.5.
- Update README, docs (security/API/cryptography), and CHANGELOG.
- Remove send-path keyword blocklist that silently rejected legitimate
messages (e.g. "constructor", "global", "document.", literal "javascript:")
without adding protection. XSS is enforced at the rendering boundary by the
receive-side DOMPurify pass and by sanitizeMessage() before encryption.
- Preserve newlines/tabs/indentation in _sanitizeInputString; stop collapsing
all whitespace which destroyed multi-line messages and code snippets.
- Stop logging raw AAD (sessionId + keyFingerprint) on validation failure;
log length only, in both message and file-message AAD validators.
- Add Strict-Transport-Security (2y + preload) and Permissions-Policy
(camera=self for QR, rest denied) to nginx.conf and .htaccess.
- Add tests/outgoing-message-integrity.test.mjs regression suite.
- nginx: asset extensions use try_files $uri =404 so a missing file (e.g.
config/ice-servers.js) no longer serves index.html with the wrong content type
- add config/ice-servers.prod.js (public STUN, no secrets); Dockerfile copies it
to the git-ignored config/ice-servers.js so the operator-override path exists
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