753d6543d4
Element Call encrypts media by default. Bot must: 1. Generate its own 32-byte E2EE key 2. Publish it to room state (io.element.call.encryption_keys) 3. Connect to LiveKit with HKDF E2EE enabled 4. Use caller's key when received, own key as fallback This fixes: Nicht verschlüsselt warning, silent audio (encrypted frames couldn't be decoded by VAD/STT) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
248 lines
9.2 KiB
Python
248 lines
9.2 KiB
Python
"""Voice session: LiveKit + STT/LLM/TTS pipeline.
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E2EE via HKDF key derivation (Element Call compatible).
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Requires patched livekit-rtc FFI binary from onestacked/livekit-rust-sdks."""
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import asyncio
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import base64
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import datetime
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import hashlib
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import logging
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import os
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import aiohttp
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from livekit import rtc, api as lkapi
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from livekit.agents import Agent, AgentSession, room_io
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from livekit.plugins import openai as lk_openai, elevenlabs, silero
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logger = logging.getLogger("matrix-ai-voice")
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# Enable debug logging for agents pipeline to diagnose audio issues
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logging.getLogger("livekit.agents").setLevel(logging.DEBUG)
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logging.getLogger("livekit.plugins").setLevel(logging.DEBUG)
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LITELLM_URL = os.environ.get("LITELLM_BASE_URL", "")
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LITELLM_KEY = os.environ.get("LITELLM_API_KEY", "not-needed")
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LK_API_KEY = os.environ.get("LIVEKIT_API_KEY", "")
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LK_API_SECRET = os.environ.get("LIVEKIT_API_SECRET", "")
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ELEVENLABS_KEY = os.environ.get("ELEVENLABS_API_KEY", "")
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DEFAULT_VOICE_ID = "onwK4e9ZLuTAKqWW03F9" # Daniel - male, free tier
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VOICE_PROMPT = """Du bist ein hilfreicher Sprachassistent in einem Matrix-Anruf.
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STRIKTE Regeln:
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- Antworte IMMER auf Deutsch
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- Halte JEDE Antwort auf MAXIMAL 1-2 kurze Saetze
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- Sei direkt und praezise, keine Fuellwoerter
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- Erfinde NICHTS - keine Geschichten, keine Musik, keine Fantasie
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- Beantworte nur was gefragt wird
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- Wenn niemand etwas fragt, sage nur kurz Hallo"""
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_vad = None
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def _get_vad():
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global _vad
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if _vad is None:
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_vad = silero.VAD.load()
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return _vad
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def _make_lk_identity(user_id, device_id):
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return f"{user_id}:{device_id}"
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def _compute_lk_room_name(room_id):
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raw = f"{room_id}|m.call#ROOM"
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return base64.b64encode(hashlib.sha256(raw.encode()).digest()).decode().rstrip("=")
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def _generate_lk_jwt(room_id, user_id, device_id):
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identity = _make_lk_identity(user_id, device_id)
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lk_room = _compute_lk_room_name(room_id)
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token = (
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lkapi.AccessToken(LK_API_KEY, LK_API_SECRET)
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.with_identity(identity)
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.with_name(user_id)
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.with_grants(lkapi.VideoGrants(
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room_join=True, room=lk_room,
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can_publish=True, can_subscribe=True))
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.with_ttl(datetime.timedelta(hours=24))
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)
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logger.info("JWT: identity=%s room=%s", identity, lk_room)
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return token.to_jwt()
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KDF_HKDF = 1
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def _build_e2ee_options(shared_key: bytes) -> rtc.E2EEOptions:
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"""Build HKDF E2EE options matching Element Call's key derivation."""
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key_opts = rtc.KeyProviderOptions(
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shared_key=shared_key,
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ratchet_window_size=0,
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ratchet_salt=b"LKFrameEncryptionKey",
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failure_tolerance=-1,
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key_ring_size=16,
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key_derivation_function=KDF_HKDF,
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)
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return rtc.E2EEOptions(key_provider_options=key_opts)
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class VoiceSession:
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def __init__(self, nio_client, room_id, device_id, lk_url, model="claude-sonnet"):
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self.nio_client = nio_client
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self.room_id = room_id
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self.device_id = device_id
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self.lk_url = lk_url
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self.model = model
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self.lk_room = None
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self.session = None
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self._task = None
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self._http_session = None
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self._e2ee_key: bytes | None = None
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def on_encryption_key(self, sender, device_id, key, index):
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"""Receive E2EE key from Element Call participant."""
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if key and not self._e2ee_key:
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self._e2ee_key = key
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logger.info("E2EE key received from %s:%s (index=%d, %d bytes)",
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sender, device_id, index, len(key))
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async def _publish_e2ee_key(self, key: bytes):
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"""Publish our E2EE key to room state so Element Call shares its key with us."""
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import base64 as b64
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key_b64 = b64.urlsafe_b64encode(key).decode().rstrip("=")
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content = {
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"call_id": "",
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"device_id": self.device_id,
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"keys": [{"index": 0, "key": key_b64}],
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}
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user_id = self.nio_client.user_id
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state_key = f"{user_id}:{self.device_id}"
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try:
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ENCRYPTION_KEYS_TYPE = "io.element.call.encryption_keys"
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await self.nio_client.room_put_state(
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self.room_id, ENCRYPTION_KEYS_TYPE, content, state_key=state_key,
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)
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logger.info("Published E2EE key (state_key=%s)", state_key)
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except Exception:
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logger.exception("Failed to publish E2EE key")
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async def start(self):
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self._task = asyncio.create_task(self._run())
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async def stop(self):
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for obj in [self.session, self.lk_room, self._http_session]:
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if obj:
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try:
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if hasattr(obj, "aclose"):
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await obj.aclose()
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elif hasattr(obj, "disconnect"):
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await obj.disconnect()
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elif hasattr(obj, "close"):
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await obj.close()
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except Exception:
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pass
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if self._task and not self._task.done():
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self._task.cancel()
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try:
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await self._task
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except asyncio.CancelledError:
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pass
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async def _run(self):
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try:
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user_id = self.nio_client.user_id
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jwt = _generate_lk_jwt(self.room_id, user_id, self.device_id)
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# Generate our own E2EE key and publish it to the room
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# Element Call requires ALL participants to publish keys
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import secrets
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our_key = secrets.token_bytes(32)
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await self._publish_e2ee_key(our_key)
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logger.info("Published our E2EE key (%d bytes)", len(our_key))
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# Wait up to 10s for caller's E2EE encryption key
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for _ in range(100):
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if self._e2ee_key:
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break
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await asyncio.sleep(0.1)
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# Use caller's key if available, otherwise use our own
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shared_key = self._e2ee_key or our_key
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if self._e2ee_key:
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logger.info("Using caller's E2EE key (%d bytes)", len(self._e2ee_key))
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else:
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logger.warning("No caller key received after 10s, using our own key")
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e2ee_opts = _build_e2ee_options(shared_key)
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logger.info("E2EE enabled with HKDF")
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room_opts = rtc.RoomOptions(e2ee=e2ee_opts)
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self.lk_room = rtc.Room()
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@self.lk_room.on("participant_connected")
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def on_p(p):
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logger.info("Participant connected: %s", p.identity)
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@self.lk_room.on("track_published")
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def on_tp(pub, p):
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logger.info("Track pub: %s %s kind=%s", p.identity, pub.sid, pub.kind)
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@self.lk_room.on("track_subscribed")
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def on_ts(t, pub, p):
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logger.info("Track sub: %s %s kind=%s", p.identity, pub.sid, t.kind)
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await self.lk_room.connect(self.lk_url, jwt, options=room_opts)
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logger.info("Connected (E2EE=HKDF), remote=%d",
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len(self.lk_room.remote_participants))
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# Find the remote participant to link to
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remote_identity = None
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for p in self.lk_room.remote_participants.values():
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remote_identity = p.identity
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logger.info("Linking to remote participant: %s", remote_identity)
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break
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# Voice pipeline — German male voice (Daniel)
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self._http_session = aiohttp.ClientSession()
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voice_id = os.environ.get("ELEVENLABS_VOICE_ID", DEFAULT_VOICE_ID)
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self.session = AgentSession(
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stt=elevenlabs.STT(api_key=ELEVENLABS_KEY, http_session=self._http_session),
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llm=lk_openai.LLM(base_url=LITELLM_URL, api_key=LITELLM_KEY, model=self.model),
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tts=elevenlabs.TTS(voice_id=voice_id, model="eleven_multilingual_v2",
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api_key=ELEVENLABS_KEY, http_session=self._http_session),
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vad=_get_vad(),
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)
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# Debug: log speech events
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@self.session.on("user_speech_committed")
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def _on_user_speech(msg):
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logger.info("USER_SPEECH: %s", msg.text_content)
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@self.session.on("agent_speech_committed")
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def _on_agent_speech(msg):
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logger.info("AGENT_SPEECH: %s", msg.text_content)
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agent = Agent(instructions=VOICE_PROMPT)
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room_opts = room_io.RoomOptions(
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participant_identity=remote_identity,
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) if remote_identity else None
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await self.session.start(
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agent=agent,
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room=self.lk_room,
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room_options=room_opts,
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)
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logger.info("Voice pipeline started (voice=%s, linked_to=%s)", voice_id, remote_identity)
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try:
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await asyncio.wait_for(
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self.session.generate_reply(
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instructions="Sage nur: Hallo, wie kann ich helfen?"),
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timeout=30.0)
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logger.info("Greeting sent")
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except asyncio.TimeoutError:
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logger.error("Greeting timed out")
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while True:
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await asyncio.sleep(1)
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except asyncio.CancelledError:
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logger.info("Session cancelled for %s", self.room_id)
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except Exception:
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logger.exception("Session failed for %s", self.room_id)
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