wip adapt lobby to be functional in an iframe

Only report `Other` `MediaDeviceFailure` cases as they genuinely
need investigation.

Make sure we do not report the same situation both as a media event
and as a media exception when it is already handled.

CHANGELOG.md

@@ -8,6 +8,68 @@ and this project adheres to
 
 ## [Unreleased]
 
+## [1.27.0] - 2026-08-14
+
+### Changed
+
+- 🔥(frontend) drop unused vendored ConnectionObserver
+- 🐛(frontend) vendor formatChatMessageLinks and trim surrounding newlines
+
+### Fixed
+
+- 📈(frontend) downgrade unreachable external home URL from error to event
+- 🐛(frontend) handle 401 responses when syncing user preferences
+- 🐛(frontend) harden speaker test against missing sinks and play errors
+- 🐛(frontend) implement hysteresis band for the control bar layout
+- 🐛(frontend) fix toolbar ResizeObserver loop and alignment drift
+- 🐛(analytics) filter benign ResizeObserver loop error in Sentry/PostHog
+- 🐛(frontend) stop reporting screen-share denials as errors
+- 🐛(frontend) generalize screen-share error modal beyond macOS
+- 📈(frontend) stop double-reporting media device failures
+
+## [1.26.0] - 2026-08-12
+
+### Added
+
+- 📈(frontend) capture media diagnostics on media errors
+- ✨(frontend) add an audio gauge to the microphone select menu
+- ✨(frontend) add a sound tester to the output select menu
+- ✨(frontend) prompt for permissions when toggling a denied device
+- ⚗️(frontend) capture console.error in PostHog
+- 📈(frontend) snapshot media devices on the happy path
+- 🚸(frontend) guide users when the OS blocks browser media access
+- ✨(frontend) add a silent-microphone watcher on join and room screens
+
+### Changed
+
+- ♻️(frontend) encapsulate error tracking behind a telemetry module
+- ♻️(frontend) encapsulate PostHog capture calls in the telemetry module
+- 🔧(frontend) sync persisted device ids with the actual selected devices
+- 💄(frontend) hide the ProConnect button on narrow viewports
+- ♻️(frontend) prefer captureMediaEvent over reportError when no-op
+
+### Fixed
+
+- 🐛(frontend) drop exact deviceId constraint on dynamic track creation
+- 🐛(frontend) fix permission store regression
+- 🐛(frontend) handle missing device errors gracefully
+- 🐛(frontend) display the meeting id in the join screen page title
+
+## [1.25.2] - 2026-08-06
+
+### Fixed
+
+- 🐛(frontend) serve MediaPipe assets under a versioned path
+- 🐛(frontend) harmonize cache configuration for MediaPipe assets
+
+## [1.25.1] - 2026-08-06
+
+### Fixed
+
+- 🚑️(frontend) fix background crash from MediaPipe WASM version mismatch
+
+## [1.25.0] - 2026-08-05
+
 ### Added
 
 - ✨(summary) report exception type in failure analytics
@@ -17,6 +79,9 @@ and this project adheres to
 - ✨(backend) add roomkit viewset to start a room without WebRTC join
 - ✨(frontend) let users set default configuration for generated links
 - ✨(frontend) expose media state to external gateways
+- ✨(frontend) add connection test feature
+- ✨(sdk) allow passing a background color to the calendar iframe
+- ✨(sdk) add a room configuration popup from CreateMeetingButton
 
 ### Changed
 
@@ -42,6 +107,12 @@ and this project adheres to
 - 🐛(frontend) fall back to user.full_name on request-entry
 - 🚸(frontend) show two initials in the Avatar when possible
 - 🩹(all) clear the SonarCloud reliability finding and the lint debt
+- 🐛(frontend) stop the installed app reopening the room it came from
+- 🐛(backend) serialize lazy title in summary payload
+- 💄(frontend) show pointer cursor on interactive switches
+- 🐛(frontend) fix icon centering in the Switch primitive
+- 🐛(frontend) keep Unicode initials intact in avatar
+- 🐛(frontend) prevent concurrent settings updates from overwriting each other
 
 ## [1.24.0] - 2026-07-21
 

docker/dinum-frontend/nginx/default.conf

@@ -65,6 +65,11 @@ server {
       sub_filter_once off;
   }
 
+  location ^~ /assets/mediapipe/wasm/ {
+      expires 30d;
+      add_header Cache-Control "public, max-age=2592000";
+  }
+
   # Serve static files with caching
   location ~* ^/assets/.*\.(css|js|json|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
       expires 30d;

env.d/development/common.dist

@@ -104,3 +104,6 @@ APPLICATION_JWT_AUDIENCE=http://localhost:8071/external-api/v1.0/
 APPLICATION_JWT_SECRET_KEY=devKey
 APPLICATION_BASE_URL=http://localhost:3000
 
+# Diagnostics
+CONNECTION_TEST_ENABLED = True
+

src/agents/pyproject.toml

@@ -1,7 +1,7 @@
 
 [project]
 name = "agents"
-version = "1.24.0"
+version = "1.27.0"
 requires-python = ">=3.12"
 dependencies = [
     "livekit-agents==1.6.7",

src/agents/uv.lock

@@ -9,7 +9,7 @@ resolution-markers = [
 
 [[package]]
 name = "agents"
-version = "1.24.0"
+version = "1.27.0"
 source = { virtual = "." }
 dependencies = [
     { name = "livekit-agents" },

src/backend/core/api/__init__.py

@@ -65,6 +65,7 @@ def get_frontend_configuration(request):
             "default_access_level": settings.RESOURCE_DEFAULT_ACCESS_LEVEL,
         },
         "subtitle": {"enabled": settings.ROOM_SUBTITLE_ENABLED},
+        "diagnostics": {"connection_test_enabled": settings.CONNECTION_TEST_ENABLED},
         "livekit": {
             "url": settings.LIVEKIT_CONFIGURATION["url"],
             "force_wss_protocol": settings.LIVEKIT_FORCE_WSS_PROTOCOL,

src/backend/core/api/feature_flag.py

@@ -17,6 +17,8 @@ class FeatureFlag:
         "addons": "ADDONS_ENABLED",
         "application": "APPLICATION_ENABLED",
         "roomkit": "ROOMKIT_ENABLED",
+        "connection_test": "CONNECTION_TEST_ENABLED",
+        "user_access_token": "USER_ACCESS_TOKEN_ENABLED",
     }
 
     @classmethod

src/backend/core/api/serializers.py

@@ -292,6 +292,11 @@ class RequestEntrySerializer(BaseValidationOnlySerializer):
     """Validate request entry data."""
 
     username = serializers.CharField(required=True)
+    participant_id = serializers.UUIDField(required=False, allow_null=True)
+
+    def validate_participant_id(self, value):
+        """The id is a bearer credential: never trusted, only looked up."""
+        return str(value) if value else None
 
 
 class ParticipantEntrySerializer(BaseValidationOnlySerializer):
@@ -599,3 +604,25 @@ class ExternalProcessEventSerializer(BaseValidationOnlySerializer):
     # useless bad requests
     type = serializers.CharField(required=False, allow_null=True, allow_blank=True)
     status = serializers.CharField(required=False, allow_null=True, allow_blank=True)
+
+
+class TransitCodeSerializer(BaseValidationOnlySerializer):
+    """Validate the single-use transit code sent to the exchange endpoint."""
+
+    # todo if I can pass the max length directly to the char field
+    code = serializers.CharField(max_length=255, trim_whitespace=True)
+
+    def validate_code(self, value):
+        """Reject codes whose length cannot match a generated one.
+
+        `secrets.token_urlsafe(nbytes)` produces (4 * nbytes + 2) // 3
+        url-safe characters. Checking the length against the configured
+        TRANSIT_CODE_NBYTES makes malformed codes fail fast with a 400,
+        before any cache lookup.
+        """
+        expected_length = (4 * settings.TRANSIT_CODE_NBYTES + 2) // 3
+
+        if len(value) != expected_length:
+            raise serializers.ValidationError("Invalid transit code format.")
+
+        return value

src/backend/core/api/throttling.py

@@ -1,11 +1,11 @@
 """Throttling modules for the API."""
 
-from django.conf import settings
-
 from lasuite.drf.throttling import MonitoredThrottleMixin
 from rest_framework.throttling import AnonRateThrottle, UserRateThrottle
 from sentry_sdk import capture_message
 
+from . import serializers
+
 
 def sentry_monitoring_throttle_failure(message):
     """Log when a failure occurs to detect rate limiting issues."""
@@ -42,13 +42,14 @@ class RequestEntryAnonRateThrottle(MonitoredAnonRateThrottle):
     def get_cache_key(self, request, view):
         """Use the lobby participant cookie ID as the throttle cache key.
 
-        Only throttle if a cookie is already set. If no cookie exists yet,
-        return None to skip throttling — the cookie will be set on the first
-        response, and throttling will apply from the second request onward.
+        Only throttle requests carrying a participant identifier. The
+        identifier is returned by the first request-entry response and
+        echoed back by the client from the second request onward, which is
+        when throttling starts applying.
 
-        Keying on the cookie rather than the IP address prevents penalising
-        multiple users behind the same NAT/proxy, and is consistent with how
-        LobbyService identifies participants.
+        Keying on the identifier rather than the IP address prevents
+        penalising multiple users behind the same NAT/proxy, and is
+        consistent with how the lobby identifies participants.
 
         Note: as per DRF documentation, application-level throttling is not a
         security measure against brute-force or DoS attacks. This throttle exists
@@ -58,10 +59,14 @@ class RequestEntryAnonRateThrottle(MonitoredAnonRateThrottle):
         if request.user and request.user.is_authenticated:
             return None  # Only throttle unauthenticated requests.
 
-        participant_id = request.COOKIES.get(settings.LOBBY_COOKIE_NAME)
+        serializer = serializers.RequestEntrySerializer(data=request.data)
+        if not serializer.is_valid():
+            return None
 
-        if participant_id is None:
-            return None  # No throttling for cookieless requests
+        participant_id = serializer.validated_data.get("participant_id")
+
+        if not participant_id:
+            return None  # No throttling for unidentified requests
 
         return self.cache_format % {
             "scope": self.scope,
@@ -85,3 +90,26 @@ class RoomKitJoinRateThrottle(MonitoredUserRateThrottle):
     """
 
     scope = "roomkit_join"
+
+
+class ConnectionTestUserRateThrottle(MonitoredUserRateThrottle):
+    """Throttle authenticated users requesting connection test tokens."""
+
+    scope = "connection_test"
+
+
+class ConnectionTestAnonRateThrottle(MonitoredAnonRateThrottle):
+    """Throttle anonymous users requesting connection test tokens."""
+
+    scope = "connection_test"
+
+
+class ExchangeAccessTokenAnonRateThrottle(MonitoredAnonRateThrottle):
+    """Throttle anonymous transit code exchange attempts.
+
+    Abuse mitigation only, not a security boundary: DRF throttling is
+    best-effort. The security of the exchange rests on the codes'
+    entropy and single use.
+    """
+
+    scope = "exchange_access_token"

src/backend/core/api/viewsets.py

@@ -2,8 +2,10 @@
 # pylint: disable=too-many-lines
 
 import uuid
+from datetime import timedelta
 from logging import getLogger
 from urllib.parse import unquote, urlparse
+from uuid import uuid4
 
 from django.conf import settings
 from django.core.exceptions import ValidationError as DjangoValidationError
@@ -27,6 +29,9 @@ from rest_framework import (
 from rest_framework import (
     exceptions as drf_exceptions,
 )
+from rest_framework import (
+    permissions as drf_permissions,
+)
 from rest_framework import (
     response as drf_response,
 )
@@ -36,6 +41,7 @@ from rest_framework import (
 from rest_framework.settings import api_settings
 
 from core import analytics, enums, models, utils
+from core.api import throttling
 from core.api.filters import ListFileFilter
 from core.enums import MEDIA_STORAGE_URL_PATTERN
 from core.recording.enums import FileExtension
@@ -69,6 +75,7 @@ from core.recording.worker.mediator import (
     WorkerServiceMediator,
 )
 from core.services.invitation import InvitationService
+from core.services.jwt_token import JwtTokenService
 from core.services.livekit_events import (
     LiveKitEventsService,
     LiveKitWebhookError,
@@ -93,7 +100,10 @@ from core.services.room_roles import (
     RoomRoleService,
 )
 from core.services.subtitle import SubtitleException, SubtitleService
+from core.tasks.connection_test import delete_connection_test_room
+from core.services.transit_code import TransitCodeService
 from core.tasks.file import process_file_deletion
+from core.utils import generate_token
 
 from ..authentication.livekit import LiveKitTokenAuthentication
 from ..models import RoomAccessLevel
@@ -229,6 +239,76 @@ class UserViewSet(
             self.serializer_class(request.user, context=context).data
         )
 
+    @decorators.action(
+        detail=False,
+        methods=["post"],
+        url_path="exchange-access-token",
+        permission_classes=[],
+        throttle_classes=[throttling.ExchangeAccessTokenAnonRateThrottle],
+    )
+    @FeatureFlag.require("user_access_token")
+    def exchange_access_token(self, request):
+        """Exchange a single-use transit code for a user access token.
+
+        The endpoint is unauthenticated: the transit code itself, an opaque
+        random string obtained through the external API and delivered to
+        the embedded frontend via a URL fragment, is the credential. Each
+        code can be exchanged exactly once (consuming it deletes it from
+        the cache); replaying a consumed code is denied and logged.
+
+        The issued JWT authenticates the user the code was minted for on
+        the whole core API, exactly like a session cookie would (similar
+        to lib-jitsi-meet's token authentication), and never appears in
+        any URL. Role-based permissions apply unchanged.
+        """
+        serializer = serializers.TransitCodeSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+
+        code_data = TransitCodeService().consume_code(serializer.validated_data["code"])
+
+        if code_data is None:
+            logger.warning("Invalid, expired or already used transit code")
+            raise drf_exceptions.PermissionDenied(
+                "Invalid, expired or already used transit code."
+            )
+
+        # Re-check the user at exchange time so that a deactivation after
+        # the transit code was minted is taken into account.
+        try:
+            user = models.User.objects.get(id=code_data["user_id"], is_active=True)
+        except models.User.DoesNotExist as excpt:
+            raise drf_exceptions.PermissionDenied(
+                "This account can no longer access the application."
+            ) from excpt
+
+        token_service = JwtTokenService(
+            secret_key=settings.USER_ACCESS_TOKEN_SECRET_KEY,
+            algorithm=settings.USER_ACCESS_TOKEN_ALG,
+            issuer=settings.USER_ACCESS_TOKEN_ISSUER,
+            audience=settings.USER_ACCESS_TOKEN_AUDIENCE,
+            expiration_seconds=settings.USER_ACCESS_TOKEN_TTL,
+            token_type=settings.USER_ACCESS_TOKEN_TYPE,
+        )
+
+        # todo - discuss wether it's the relevant scope
+        data = token_service.generate_jwt(
+            user,
+            "user:access",
+            {
+                "token_type": "user_access",
+                "client_id": code_data.get("client_id", "unknown"),
+            },
+        )
+
+        # Log for auditing
+        logger.info(
+            "User access token issued from transit code: user_id=%s, client_id=%s",
+            user.id,
+            code_data.get("client_id", "unknown"),
+        )
+
+        return drf_response.Response(data)
+
 
 class RoomViewSet(
     mixins.CreateModelMixin,
@@ -518,10 +598,7 @@ class RoomViewSet(
             request=request,
             **serializer.validated_data,
         )
-        response = drf_response.Response({**participant.to_dict(), "livekit": livekit})
-        lobby_service.prepare_response(response, participant.id)
-
-        return response
+        return drf_response.Response({**participant.to_dict(), "livekit": livekit})
 
     @decorators.action(
         detail=True,
@@ -1563,3 +1640,68 @@ class FileViewSet(
         request = utils.generate_s3_authorization_headers(f"{url_params.get('key'):s}")
 
         return drf_response.Response("authorized", headers=request.headers, status=200)
+
+
+class DiagnosticsViewSet(viewsets.ViewSet):
+    """Endpoints helping users and support diagnose connectivity issues.
+
+    Diagnostics are grouped behind a single prefix so upcoming checks
+    (rtcstats collection, ICE candidate reports, etc.) can be added as new
+    actions rather than new top-level routes.
+
+    They are open to anonymous users: someone who cannot join a room is
+    exactly who needs to run a test, and they may well not be logged in.
+    Each action therefore carries its own throttle scope.
+    """
+
+    permission_classes = [drf_permissions.AllowAny]
+
+    @decorators.action(
+        detail=False,
+        methods=["POST"],
+        url_path="connection",
+        url_name="connection",
+        throttle_classes=[
+            throttling.ConnectionTestUserRateThrottle,
+            throttling.ConnectionTestAnonRateThrottle,
+        ],
+    )
+    @FeatureFlag.require("connection_test")
+    def connection(self, request):
+        """Return a short-lived LiveKit token for an ephemeral test room.
+
+        Going through the room API is not an option here: it is tied to
+        registered meetings, lobby rules and longer-lived tokens. Each call
+        gets its own room so two people testing at the same time never meet.
+        """
+        room = f"{settings.CONNECTION_TEST_ROOM_PREFIX}-{uuid4()}"
+        expires_in = settings.CONNECTION_TEST_TOKEN_TTL_SECONDS
+
+        # LiveKit refreshes tokens for connected clients, so JWT TTL alone does not
+        # eject someone who stays connected. Schedule a hard DeleteRoom when Celery
+        # is available.
+        if settings.CELERY_ENABLED:
+            max_age = (
+                settings.CONNECTION_TEST_TOKEN_TTL_SECONDS
+                + settings.CONNECTION_TEST_ROOM_EXTRA_AGE_SECONDS
+            )
+            delete_connection_test_room.apply_async(
+                args=[room],
+                countdown=max_age,
+            )
+
+        return drf_response.Response(
+            {
+                "livekit": {
+                    "url": settings.LIVEKIT_CONFIGURATION["url"],
+                    "room": room,
+                    "token": generate_token(
+                        room=room,
+                        user=request.user,
+                        username="Connection Test",
+                        ttl=timedelta(seconds=expires_in),
+                    ),
+                    "expires_in": expires_in,
+                },
+            }
+        )

src/backend/core/authentication/livekit.py

@@ -9,6 +9,8 @@ from rest_framework import authentication, exceptions
 
 UserModel = get_user_model()
 
+LIVEKIT_AUTH_SCHEME = "X-LiveKit-Token"
+
 
 class LiveKitTokenAuthentication(authentication.BaseAuthentication):
     """Authenticate using LiveKit token and load the associated Django user."""
@@ -20,9 +22,14 @@ class LiveKitTokenAuthentication(authentication.BaseAuthentication):
             return None  # No authentication attempted
 
         parts = auth_header.split()
-        if len(parts) != 2 or parts[0].lower() != "bearer":
+        if not parts or parts[0].lower() != LIVEKIT_AUTH_SCHEME.lower():
+            # Not our scheme (e.g. "Bearer <user access token>"): defer, another
+            # backend may recognize it.
+            return None
+
+        if len(parts) != 2:
             raise exceptions.AuthenticationFailed(
-                "Authorization header must be: Bearer <token>"
+                f"Authorization header must be: {LIVEKIT_AUTH_SCHEME} <token>"
             )
 
         token = parts[1]

src/backend/core/authentication/user_token.py

@@ -0,0 +1,71 @@
+"""User access JWT authentication for the Meet core API.
+
+Allows an embedded frontend (e.g. rendered in an iframe, where third-party
+session cookies are blocked) to authenticate requests on the core API with
+a JWT, obtained by exchanging a single-use transit code (see
+core.services.transit_code and the users exchange-access-token endpoint)
+and passed as a Bearer header. The JWT itself never appears in any URL.
+
+Similar to lib-jitsi-meet's token authentication, the token is bound to a
+user, not to a resource: once authenticated, the request is treated
+exactly like a session-authenticated one, and the existing role-based
+permissions apply unchanged.
+"""
+
+import logging
+
+from django.conf import settings
+
+from rest_framework import exceptions
+
+from core.external_api.authentication import BaseJWTAuthentication
+
+logger = logging.getLogger(__name__)
+
+USER_ACCESS_TOKEN_TYPE_CLAIM = "user_access"  # noqa: S105
+
+
+class UserAccessJWTAuthentication(BaseJWTAuthentication):
+    """JWT authentication for user access tokens.
+
+    Validates user access tokens issued by the users exchange-access-token
+    endpoint and authenticates the user they were issued for. A bearer
+    token that does not verify against the user access token secret is
+    deferred to the next authentication backend; a token that does verify
+    but carries wrong claims is rejected.
+
+    When the feature is disabled (USER_ACCESS_TOKEN_ENABLED=False), the
+    backend is entirely inert: `BaseJWTAuthentication.authenticate`
+    returns None before reading the Authorization header, deferring every
+    request to the next authentication backend.
+    """
+
+    def __init__(self):
+        """Initialize the backend with user access token settings."""
+        super().__init__(
+            secret_key=settings.USER_ACCESS_TOKEN_SECRET_KEY,
+            algorithm=settings.USER_ACCESS_TOKEN_ALG,
+            issuer=settings.USER_ACCESS_TOKEN_ISSUER,
+            audience=settings.USER_ACCESS_TOKEN_AUDIENCE,
+            expiration_seconds=settings.USER_ACCESS_TOKEN_TTL,
+            token_type=settings.USER_ACCESS_TOKEN_TYPE,
+            is_enabled=settings.USER_ACCESS_TOKEN_ENABLED,
+        )
+
+    def validate_payload(self, payload):
+        """Validate the token type and the issuance-audit claim.
+
+        Raises:
+            AuthenticationFailed: If the token verified against the user
+                access token secret but does not carry the expected claims.
+        """
+        if payload.get("token_type") != USER_ACCESS_TOKEN_TYPE_CLAIM:
+            logger.warning("Wrong 'token_type' in user access token payload")
+            raise exceptions.AuthenticationFailed("Invalid token type.")
+
+        # Every token we issue carries the client_id of the application the
+        # transit code was minted for: its absence means the token does not
+        # come from the exchange endpoint.
+        if not payload.get("client_id"):
+            logger.warning("Missing 'client_id' in user access token payload")
+            raise exceptions.AuthenticationFailed("Invalid token claims.")

src/backend/core/external_api/permissions.py

@@ -86,6 +86,14 @@ class HasRequiredRoomScope(BaseScopePermission):
     }
 
 
+class HasRequiredUserScope(BaseScopePermission):
+    """Scope-based permissions for the external user endpoints."""
+
+    scope_map = {
+        "generate_transit_code": models.ApplicationScope.USERS_SESSION,
+    }
+
+
 class RoomPermissions(permissions.BasePermission):
     """Permissions applying to the room API endpoint."""
 

src/backend/core/external_api/viewsets.py

@@ -22,6 +22,7 @@ from rest_framework import (
 from core import analytics, api, models
 from core.api.feature_flag import FeatureFlag
 from core.services.jwt_token import JwtTokenService
+from core.services.transit_code import TransitCodeService
 
 from ..services.provisional_user_service import (
     ProvisionalUserCreationDisabledError,
@@ -218,3 +219,62 @@ class RoomViewSet(
                 "$set": {"email": self.request.user.email},
             },
         )
+
+
+class UserViewSet(viewsets.GenericViewSet):
+    """Application-delegated API for user operations.
+
+    Provides JWT-authenticated access to user operations for external
+    applications acting on behalf of users. All operations are
+    scope-based. Meant to grow with the other user actions exposed to
+    third parties.
+
+    Supported operations:
+    - transit-code: Mint a single-use transit code for the delegated user
+      (requires 'users:session' scope)
+    """
+
+    authentication_classes = [
+        authentication.ApplicationJWTAuthentication,
+        ResourceServerAuthentication,
+    ]
+    permission_classes = [
+        api.permissions.IsAuthenticated & permissions.HasRequiredUserScope
+    ]
+
+    @decorators.action(
+        detail=False,
+        methods=["post"],
+        url_path="transit-code",
+        url_name="transit-code",
+    )
+    @FeatureFlag.require("user_access_token")
+    def generate_transit_code(self, request):
+        """Mint a transit code for the delegated user.
+
+        Returns a short-lived, single-use opaque code to pass to an embedded
+        frontend (e.g. via a URL fragment when cookies are unavailable). The
+        frontend exchanges it once on
+        POST /api/v1.0/users/exchange-access-token/ for a JWT access token,
+        equivalent to session-cookie authentication and never exposed in a URL.
+        """
+        auth_method = type(request.successful_authenticator).__name__
+        client_id = (request.auth or {}).get("client_id", "unknown")
+
+        code = TransitCodeService().create_code(request.user, client_id=client_id)
+
+        # Log for auditing
+        logger.info(
+            "Transit code issued: user_id=%s, client_id=%s, auth_method=%s",
+            request.user.id,
+            client_id,
+            auth_method,
+        )
+
+        return drf_response.Response(
+            {
+                "transit_code": code,
+                "expires_in": settings.TRANSIT_CODE_TTL,
+            },
+            status=drf_status.HTTP_200_OK,
+        )

src/backend/core/migrations/0022_alter_application_scopes.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.2.14 on 2026-07-31 18:27
+
+import django.contrib.postgres.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0021_recording_external_process_id_alter_recording_status'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='application',
+            name='scopes',
+            field=django.contrib.postgres.fields.ArrayField(base_field=models.CharField(choices=[('rooms:create', 'Create rooms'), ('rooms:list', 'List rooms'), ('rooms:retrieve', 'Retrieve room details'), ('rooms:update', 'Update rooms'), ('rooms:delete', 'Delete rooms'), ('users:session', 'Create user session tokens')], max_length=50), blank=True, default=list, size=None),
+        ),
+    ]

src/backend/core/models.py

@@ -795,6 +795,7 @@ class ApplicationScope(models.TextChoices):
     ROOMS_RETRIEVE = "rooms:retrieve", _("Retrieve room details")
     ROOMS_UPDATE = "rooms:update", _("Update rooms")
     ROOMS_DELETE = "rooms:delete", _("Delete rooms")
+    USERS_SESSION = "users:session", _("Create user session tokens")
 
 
 class Application(BaseModel):

src/backend/core/recording/event/notification.py

@@ -9,7 +9,7 @@ from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 from django.conf import settings
 from django.core.mail import send_mail
 from django.template.loader import render_to_string
-from django.utils.translation import get_language, override
+from django.utils.translation import get_language, gettext, override
 from django.utils.translation import gettext_lazy as _
 
 import aiohttp
@@ -121,7 +121,7 @@ class NotificationService:
                 msg_plain = render_to_string(
                     "mail/text/screen_recording.txt", personalized_context
                 )
-                subject = str(_("Your recording is ready"))  # Force translation
+                subject = gettext("Your recording is ready")  # Force translation
 
                 try:
                     send_mail(
@@ -192,7 +192,7 @@ class NotificationService:
         """Generate title from context or return default."""
         if recording_datetime is None:
             with override(locale):
-                return _("Transcription")
+                return gettext("Transcription")
 
         dt = recording_datetime
         if owner_timezone:

src/backend/core/services/livekit_events.py

@@ -137,6 +137,13 @@ class LiveKitEventsService:
 
         room_name = data.room.name or data.egress_info.room_name
 
+        if self._is_connection_test_room(room_name):
+            logger.info(
+                "Ignoring webhook event for connection test room '%s'.",
+                room_name,
+            )
+            return
+
         if self._filter_regex and not self._filter_regex.search(room_name):
             logger.info("Filtered webhook event for room '%s'", room_name)
             return
@@ -228,6 +235,11 @@ class LiveKitEventsService:
 
         # Silently ignoring EGRESS_ABORTED, EGRESS_FAILED
 
+    @staticmethod
+    def _is_connection_test_room(room_name: str) -> bool:
+        """Return True for ephemeral rooms created by the connection test endpoint."""
+        return room_name.startswith(settings.CONNECTION_TEST_ROOM_PREFIX)
+
     def _handle_room_started(self, data):
         """Handle 'room_started' event."""
 

src/backend/core/services/lobby.py

@@ -86,23 +86,6 @@ class LobbyService:
         """Generate cache key for participant(s) data."""
         return f"{settings.LOBBY_KEY_PREFIX}_{room_id!s}_{participant_id}"
 
-    @staticmethod
-    def _get_or_create_participant_id(request) -> str:
-        """Extract unique participant identifier from the request."""
-        return request.COOKIES.get(settings.LOBBY_COOKIE_NAME, str(uuid.uuid4()))
-
-    @staticmethod
-    def prepare_response(response, participant_id):
-        """Set participant cookie if needed."""
-        if not response.cookies.get(settings.LOBBY_COOKIE_NAME):
-            response.set_cookie(
-                key=settings.LOBBY_COOKIE_NAME,
-                value=participant_id,
-                httponly=True,
-                secure=True,
-                samesite="Lax",
-            )
-
     @staticmethod
     def can_bypass_lobby(room, user, role) -> bool:
         """Determines if a user can bypass the waiting lobby and join a room directly.
@@ -135,6 +118,7 @@ class LobbyService:
         room: models.Room,
         request,
         username: str,
+        participant_id: Optional[uuid.UUID] = None,
     ) -> Tuple[LobbyParticipant, Optional[Dict]]:
         """Request entry to a room for a participant.
 
@@ -149,22 +133,20 @@ class LobbyService:
         5. If denied, do nothing.
         """
 
-        participant_id = self._get_or_create_participant_id(request)
-        participant = self._get_participant(room.id, participant_id)
+        participant = None
+        if participant_id:
+            participant = self._get_participant(room.id, participant_id)
+
+        is_new_participant = participant is None
+        if is_new_participant:
+            participant = self._create_participant(room.id, username)
 
         room_id = str(room.id)
         user_role = room.get_role(request.user)
 
         if self.can_bypass_lobby(room=room, user=request.user, role=user_role):
-            if participant is None:
-                participant = LobbyParticipant(
-                    status=LobbyParticipantStatus.ACCEPTED,
-                    username=username,
-                    id=participant_id,
-                    color=utils.generate_color(participant_id),
-                )
-            else:
-                participant.status = LobbyParticipantStatus.ACCEPTED
+            participant.status = LobbyParticipantStatus.ACCEPTED
+            self._save_participant(room.id, participant)
 
             livekit_config = utils.generate_livekit_config(
                 room_id=room_id,
@@ -172,18 +154,18 @@ class LobbyService:
                 username=username,
                 color=participant.color,
                 configuration=room.configuration,
-                participant_id=participant_id,
+                participant_id=participant.id,
                 role=user_role,
             )
             return participant, livekit_config
 
         livekit_config = None
 
-        if participant is None:
-            participant = self.enter(room.id, participant_id, username)
+        if is_new_participant:
+            self._notify_entry_request(room_id)
 
         elif participant.status == LobbyParticipantStatus.WAITING:
-            self.refresh_waiting_status(room.id, participant_id)
+            self.refresh_waiting_status(room.id, participant.id)
 
         elif participant.status == LobbyParticipantStatus.ACCEPTED:
             # wrongly named, contains access token to join a room
@@ -193,7 +175,7 @@ class LobbyService:
                 username=username,
                 color=participant.color,
                 configuration=room.configuration,
-                participant_id=participant_id,
+                participant_id=participant.id,
                 role=user_role,
             )
 
@@ -210,27 +192,36 @@ class LobbyService:
             self._get_cache_key(room_id, participant_id), settings.LOBBY_WAITING_TIMEOUT
         )
 
-    def enter(
-        self, room_id: UUID, participant_id: str, username: str
-    ) -> LobbyParticipant:
-        """Add participant to waiting lobby.
+    def _create_participant(self, room_id: UUID, username: str) -> LobbyParticipant:
+        """Create and persist a new waiting participant.
 
-        Create a new participant entry in waiting status and notify room
-        participants of the new entry request.
+        Participant identifiers are minted here, server-side, exclusively.
         """
-
-        color = utils.generate_color(participant_id)
-
+        participant_id = str(uuid.uuid4())
         participant = LobbyParticipant(
             status=LobbyParticipantStatus.WAITING,
             username=username,
             id=participant_id,
-            color=color,
+            color=utils.generate_color(participant_id),
+        )
+        self._save_participant(room_id, participant)
+
+        return participant
+
+    def _save_participant(self, room_id: UUID, participant: LobbyParticipant):
+        """Persist a participant in the room's lobby."""
+        cache.set(
+            self._get_cache_key(room_id, participant.id),
+            participant.to_dict(),
+            timeout=settings.LOBBY_WAITING_TIMEOUT,
         )
 
+    @staticmethod
+    def _notify_entry_request(room_id: str):
+        """Notify room participants of a new entry request."""
         try:
             utils.notify_participants(
-                room_name=str(room_id),
+                room_name=room_id,
                 notification_data={
                     "type": settings.LOBBY_NOTIFICATION_TYPE,
                 },
@@ -239,15 +230,6 @@ class LobbyService:
             # If room not created yet, there is no participants to notify
             logger.exception("Failed to notify room participants")
 
-        cache_key = self._get_cache_key(room_id, participant_id)
-        cache.set(
-            cache_key,
-            participant.to_dict(),
-            timeout=settings.LOBBY_WAITING_TIMEOUT,
-        )
-
-        return participant
-
     def _get_participant(
         self, room_id: UUID, participant_id: str
     ) -> Optional[LobbyParticipant]:

src/backend/core/services/room_management.py

@@ -8,6 +8,7 @@ from typing import Dict, Optional
 
 from asgiref.sync import async_to_sync
 from livekit.api import (
+    DeleteRoomRequest,
     ListRoomsRequest,
     TwirpError,
     UpdateRoomMetadataRequest,
@@ -88,3 +89,30 @@ class RoomManagement:
 
         finally:
             await lkapi.aclose()
+
+    @async_to_sync
+    async def delete_room(self, room_name: str):
+        """Delete a LiveKit room and disconnect all participants.
+
+        Raises:
+            RoomNotFoundException: the room does not exist in LiveKit.
+            RoomManagementException: the deletion otherwise fails.
+        """
+
+        lkapi = utils.create_livekit_client()
+
+        try:
+            await lkapi.room.delete_room(DeleteRoomRequest(room=room_name))
+            logger.info("Deleted LiveKit room %s", room_name)
+        except TwirpError as e:
+            if e.code == "not_found":
+                logger.warning(
+                    "Room %s not found in LiveKit, skipping deletion",
+                    room_name,
+                )
+                raise RoomNotFoundException("Room does not exist") from e
+
+            logger.exception("Unexpected error deleting room %s", room_name)
+            raise RoomManagementException("Could not delete room") from e
+        finally:
+            await lkapi.aclose()

src/backend/core/services/transit_code.py

@@ -0,0 +1,74 @@
+"""Service handling the lifecycle of transit codes.
+
+A transit code is an opaque, cryptographically random, single-use code
+handed to an embedded frontend (through a URL fragment) so it can obtain a
+user access token on the core API without a session cookie. The code
+carries no information by itself: everything it references (user, client)
+is stored server-side in the cache, and consumed atomically on exchange.
+"""
+
+import hashlib
+import secrets
+
+from django.conf import settings
+from django.core.cache import cache
+
+
+class TransitCodeService:
+    """Create and consume single-use transit codes."""
+
+    @staticmethod
+    def _cache_key(code):
+        """Build the cache key for a code.
+
+        The code is hashed so that a dump of the cache never reveals
+        directly usable codes.
+        """
+        digest = hashlib.sha256(code.encode("utf-8")).hexdigest()
+        return f"{settings.TRANSIT_CODE_CACHE_PREFIX}:{digest}"
+
+    def create_code(self, user, client_id="unknown"):
+        """Generate a transit code for a user, and store it.
+
+        The code expires after TRANSIT_CODE_TTL seconds.
+
+        Returns:
+            str: The opaque code to hand to the client.
+        """
+        # Default 48 random bytes -> 64 url-safe characters, 384 bits of
+        # entropy: unguessable and safe to transit through a URL fragment.
+        code = secrets.token_urlsafe(settings.TRANSIT_CODE_NBYTES)
+
+        cache.set(
+            self._cache_key(code),
+            {
+                "user_id": str(user.id),
+                "client_id": client_id,
+            },
+            timeout=settings.TRANSIT_CODE_TTL,
+        )
+
+        return code
+
+    def consume_code(self, code):
+        """Consume a transit code, enforcing single use.
+
+        The code is deleted from the cache upon consumption. `cache.delete`
+        returns whether a key was actually deleted, so if two requests race
+        on the same code, only one of them wins.
+
+        Returns:
+            dict | None: The data stored at creation time ('user_id',
+                'client_id'), or None if the code is unknown, expired or
+                already consumed.
+        """
+        if not code:
+            return None
+
+        key = self._cache_key(code)
+        data = cache.get(key)
+
+        if data is None or not cache.delete(key):
+            return None
+
+        return data

src/backend/core/tasks/__init__.py

@@ -0,0 +1,9 @@
+"""Celery tasks for the core app."""
+
+from core.tasks.connection_test import delete_connection_test_room
+from core.tasks.file import process_file_deletion
+
+__all__ = (
+    "delete_connection_test_room",
+    "process_file_deletion",
+)

src/backend/core/tasks/connection_test.py

@@ -0,0 +1,39 @@
+"""Tasks related to connection test rooms."""
+
+import logging
+
+from django.conf import settings
+
+from core.services.room_management import (
+    RoomManagement,
+    RoomManagementException,
+    RoomNotFoundException,
+)
+from core.tasks._task import task
+
+logger = logging.getLogger(__name__)
+
+
+@task
+def delete_connection_test_room(room_name: str):
+    """Force-delete an ephemeral connection-test room.
+
+    Used as a hard cap so a participant cannot keep an auto-refreshed
+    LiveKit session open indefinitely after requesting a test token.
+    """
+    prefix = settings.CONNECTION_TEST_ROOM_PREFIX
+    if not room_name.startswith(prefix):
+        logger.error(
+            "Refusing to delete room '%s': expected prefix '%s'.",
+            room_name,
+            prefix,
+        )
+        return
+
+    try:
+        RoomManagement().delete_room(room_name)
+    except RoomNotFoundException:
+        # Room may already be gone after empty/departure timeout.
+        logger.info("Connection test room '%s' already gone.", room_name)
+    except RoomManagementException:
+        logger.exception("Failed to delete connection test room '%s'.", room_name)

src/backend/core/tests/recording/event/test_notification.py

@@ -5,6 +5,7 @@ Test event notification.
 # pylint: disable=assignment-from-no-return,redefined-outer-name,unused-argument,protected-access
 
 import datetime
+import json
 import smtplib
 from unittest import mock
 
@@ -418,3 +419,63 @@ def test_notify_summary_service_post_args_without_metadata(
     mock_is_feature_flag_enabled.assert_called_once_with(
         owner, UserFeatureFlag.TRANSCRIPT_SUMMARY_ENABLED
     )
+
+
+@mock.patch("core.recording.event.notification.requests.post")
+@mock.patch("core.recording.event.notification.generate_download_s3_url")
+@mock.patch.object(
+    NotificationService, "_get_recording_timestamps", new_callable=mock.AsyncMock
+)
+def test_notify_summary_service_v2_payload_json_serializable_without_timestamps(
+    mock_get_recording_timestamps,
+    mock_generate_download_s3_url,
+    mock_post,
+    settings,
+):
+    """Regression test for a non-JSON-serializable payload when timestamps are missing.
+
+    When the LiveKit egress can no longer be found, ``_get_recording_timestamps``
+    returns ``(None, None)`` and ``_generate_title`` falls back to its default
+    title. That default must be a real ``str``: it used to return a lazy
+    ``gettext_lazy`` proxy, which ``json.dumps`` cannot serialize, so the real
+    ``requests.post(json=payload)`` call crashed in production with
+    ``TypeError: Object of type __proxy__ is not JSON serializable``.
+    """
+    settings.SUMMARY_SERVICE_VERSION = 2
+    settings.SUMMARY_SERVICE_ENDPOINT = "https://summary.test/api/v2/tasks"
+    settings.SUMMARY_SERVICE_API_TOKEN = "summary-token"
+    settings.RECORDING_DOWNLOAD_BASE_URL = "https://app.test/recordings"
+    settings.SCREEN_RECORDING_BASE_URL = None
+    settings.METADATA_COLLECTOR_ENABLED = False
+
+    recording = factories.RecordingFactory(room__name="Daily")
+    owner = factories.UserFactory(
+        email="owner@test.com",
+        sub="owner-sub",
+        language="fr-fr",
+        timezone="Europe/Paris",
+    )
+    factories.UserRecordingAccessFactory(
+        recording=recording, role=models.RoleChoices.OWNER, user=owner
+    )
+
+    # Egress timestamps unavailable -> default-title branch in _generate_title.
+    mock_get_recording_timestamps.return_value = (None, None)
+    mock_generate_download_s3_url.return_value = "https://storage.test/recording.mp4"
+
+    mock_response = mock.Mock()
+    mock_response.raise_for_status.return_value = None
+    mock_response.json.return_value = {"job_id": "job-77"}
+    mock_post.return_value = mock_response
+
+    result = NotificationService._notify_summary_service(recording)
+
+    assert result is True
+
+    payload = mock_post.call_args.kwargs["json"]
+    title = payload["push_to_docs_config"]["title"]
+
+    # The title must be a plain ``str``, not a lazy translation proxy...
+    assert isinstance(title, str)
+    # ...so the payload serializes exactly the way ``requests`` serializes it.
+    json.dumps(payload)

src/backend/core/tests/rooms/test_api_rooms_create.py

@@ -2,10 +2,15 @@
 Test rooms API endpoints in the Meet core app: create.
 """
 
+from datetime import datetime, timedelta, timezone
+
+from django.conf import settings as django_settings
+
 # pylint: disable=redefined-outer-name,unused-argument
 from django.conf import settings
 from django.core.cache import cache
 
+import jwt
 import pytest
 from rest_framework.test import APIClient
 
@@ -312,3 +317,38 @@ def test_api_rooms_create_authenticated_blank_user_default_access_level():
     assert response.status_code == 201
     room = Room.objects.get()
     assert room.access_level == settings.RESOURCE_DEFAULT_ACCESS_LEVEL
+
+
+def generate_user_access_token(user):
+    """Generate a valid user access JWT signed with the token secret."""
+    now = datetime.now(timezone.utc)
+
+    payload = {
+        "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+        "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+        "iat": now,
+        "exp": now + timedelta(seconds=django_settings.USER_ACCESS_TOKEN_TTL),
+        "user_id": str(user.id),
+        "token_type": "user_access",
+        "client_id": "test-app",
+        "scope": "user:access",
+    }
+
+    return jwt.encode(
+        payload,
+        django_settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+
+
+def test_api_rooms_create_authenticated_with_user_access_token():
+    """A user access token should create a room exactly like a session would."""
+    user = UserFactory()
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+    response = client.post("/api/v1.0/rooms/", {"name": "my room"})
+
+    assert response.status_code == 201
+    room = Room.objects.get()
+    assert room.accesses.filter(role="owner", user=user).exists()

src/backend/core/tests/rooms/test_api_rooms_list.py

@@ -2,8 +2,12 @@
 Test rooms API endpoints in the Meet core app: list.
 """
 
+from datetime import datetime, timedelta, timezone
 from unittest import mock
 
+from django.conf import settings as django_settings
+
+import jwt
 import pytest
 from rest_framework.pagination import PageNumberPagination
 from rest_framework.test import APIClient
@@ -156,3 +160,40 @@ def test_api_rooms_list_pagination_page_size():
     assert len(content["results"]) == 3
     assert content["next"] == "http://testserver/api/v1.0/rooms/?page=2&page_size=3"
     assert content["previous"] is None
+
+
+def generate_user_access_token(user):
+    """Generate a valid user access JWT signed with the token secret."""
+    now = datetime.now(timezone.utc)
+
+    payload = {
+        "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+        "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+        "iat": now,
+        "exp": now + timedelta(seconds=django_settings.USER_ACCESS_TOKEN_TTL),
+        "user_id": str(user.id),
+        "token_type": "user_access",
+        "client_id": "test-app",
+        "scope": "user:access",
+    }
+
+    return jwt.encode(
+        payload,
+        django_settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+
+
+def test_api_rooms_list_authenticated_with_user_access_token():
+    """A user access token should list rooms exactly like a session would."""
+    user = UserFactory()
+    room = RoomFactory(users=[(user, "owner")])
+    RoomFactory()  # another user's room, not listed
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+    response = client.get("/api/v1.0/rooms/")
+
+    assert response.status_code == 200
+    assert response.data["count"] == 1
+    assert response.data["results"][0]["id"] == str(room.id)

src/backend/core/tests/rooms/test_api_rooms_lobby.py

@@ -14,9 +14,6 @@ from rest_framework.test import APIClient
 from ... import utils
 from ...factories import RoomFactory, UserFactory
 from ...models import RoomAccessLevel
-from ...services.lobby import (
-    LobbyService,
-)
 
 pytestmark = pytest.mark.django_db
 
@@ -29,7 +26,6 @@ def test_request_entry_anonymous(settings):
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     client = APIClient()
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Lobby cache should be empty before the request
@@ -47,11 +43,10 @@ def test_request_entry_anonymous(settings):
 
     assert response.status_code == 200
 
-    # Verify the lobby cookie was properly set
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-
-    participant_id = cookie.value
+    # The participant identifier is returned in the response body; no
+    # cookie is involved anymore
+    assert not response.cookies
+    participant_id = response.json()["id"]
 
     # Verify response content matches expected structure and values
     assert response.json() == {
@@ -78,7 +73,6 @@ def test_request_entry_authenticated_user(settings):
     client = APIClient()
     client.force_login(user)
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Lobby cache should be empty before the request
@@ -96,11 +90,10 @@ def test_request_entry_authenticated_user(settings):
 
     assert response.status_code == 200
 
-    # Verify the lobby cookie was properly set
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-
-    participant_id = cookie.value
+    # The participant identifier is returned in the response body; no
+    # cookie is involved anymore
+    assert not response.cookies
+    participant_id = response.json()["id"]
 
     # Verify response content matches expected structure and values
     assert response.json() == {
@@ -127,7 +120,6 @@ def test_request_entry_with_existing_participants(settings):
     client = APIClient()
 
     # Configure test settings for cookies and cache
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Add two participants already waiting in the lobby
@@ -168,11 +160,10 @@ def test_request_entry_with_existing_participants(settings):
     # Verify successful response
     assert response.status_code == 200
 
-    # Verify the lobby cookie was properly set for the new participant
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-
-    participant_id = cookie.value
+    # The participant identifier is returned in the response body; no
+    # cookie is involved anymore
+    assert not response.cookies
+    participant_id = response.json()["id"]
 
     # Verify response content matches expected structure and values
     assert response.json() == {
@@ -197,7 +188,6 @@ def test_request_entry_public_room(settings):
     room = RoomFactory(access_level=RoomAccessLevel.PUBLIC)
     client = APIClient()
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Lobby cache should be empty before the request
@@ -206,9 +196,7 @@ def test_request_entry_public_room(settings):
 
     with (
         mock.patch.object(utils, "notify_participants", return_value=None),
-        mock.patch.object(
-            LobbyService, "_get_or_create_participant_id", return_value="123"
-        ),
+        mock.patch("core.services.lobby.uuid.uuid4", return_value="123"),
         mock.patch.object(
             utils, "generate_livekit_config", return_value={"token": "test-token"}
         ),
@@ -221,11 +209,6 @@ def test_request_entry_public_room(settings):
 
     assert response.status_code == 200
 
-    # Verify the lobby cookie was set
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-    assert cookie.value == "123"
-
     # Verify response content matches expected structure and values
     assert response.json() == {
         "id": "123",
@@ -235,9 +218,10 @@ def test_request_entry_public_room(settings):
         "livekit": {"token": "test-token"},
     }
 
-    # Verify lobby cache is still empty after the request
+    # The accepted participant is persisted, out of the waiting list
     lobby_keys = cache.keys(f"mocked-cache-prefix_{room.id}_*")
-    assert not lobby_keys
+    assert len(lobby_keys) == 1
+    assert cache.get(lobby_keys[0])["status"] == "accepted"
 
 
 def test_request_entry_authenticated_user_public_room(settings):
@@ -247,7 +231,6 @@ def test_request_entry_authenticated_user_public_room(settings):
     client = APIClient()
     client.force_login(user)
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Lobby cache should be empty before the request
@@ -256,9 +239,8 @@ def test_request_entry_authenticated_user_public_room(settings):
 
     with (
         mock.patch.object(utils, "notify_participants", return_value=None),
-        mock.patch.object(
-            LobbyService,
-            "_get_or_create_participant_id",
+        mock.patch(
+            "core.services.lobby.uuid.uuid4",
             return_value="2f7f162f-e7d1-421b-90e7-02bfbfbf8def",
         ),
         mock.patch.object(
@@ -273,11 +255,6 @@ def test_request_entry_authenticated_user_public_room(settings):
 
     assert response.status_code == 200
 
-    # Verify the lobby cookie was set
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-    assert cookie.value == "2f7f162f-e7d1-421b-90e7-02bfbfbf8def"
-
     # Verify response content matches expected structure and values
     assert response.json() == {
         "id": "2f7f162f-e7d1-421b-90e7-02bfbfbf8def",
@@ -287,9 +264,10 @@ def test_request_entry_authenticated_user_public_room(settings):
         "livekit": {"token": "test-token"},
     }
 
-    # Verify lobby cache is still empty after the request
+    # The accepted participant is persisted, out of the waiting list
     lobby_keys = cache.keys(f"mocked-cache-prefix_{room.id}_*")
-    assert not lobby_keys
+    assert len(lobby_keys) == 1
+    assert cache.get(lobby_keys[0])["status"] == "accepted"
 
 
 def test_request_entry_waiting_participant_public_room(settings):
@@ -297,7 +275,6 @@ def test_request_entry_waiting_participant_public_room(settings):
     room = RoomFactory(access_level=RoomAccessLevel.PUBLIC)
     client = APIClient()
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
 
     # Add a waiting participant to the room's lobby cache
@@ -311,9 +288,7 @@ def test_request_entry_waiting_participant_public_room(settings):
         },
     )
 
-    # Simulate a browser with existing participant cookie
-    client.cookies.load({"mocked-cookie": "2f7f162f-e7d1-421b-90e7-02bfbfbf8def"})
-
+    # Simulate a returning participant echoing its identifier
     with (
         mock.patch.object(utils, "notify_participants", return_value=None),
         mock.patch.object(
@@ -322,16 +297,14 @@ def test_request_entry_waiting_participant_public_room(settings):
     ):
         response = client.post(
             f"/api/v1.0/rooms/{room.id}/request-entry/",
-            {"username": "user1"},
+            {
+                "username": "user1",
+                "participant_id": "2f7f162f-e7d1-421b-90e7-02bfbfbf8def",
+            },
         )
 
     assert response.status_code == 200
 
-    # Verify the lobby cookie was set
-    cookie = response.cookies.get("mocked-cookie")
-    assert cookie is not None
-    assert cookie.value == "2f7f162f-e7d1-421b-90e7-02bfbfbf8def"
-
     # Verify response content matches expected structure and values
     assert response.json() == {
         "id": "2f7f162f-e7d1-421b-90e7-02bfbfbf8def",
@@ -637,15 +610,14 @@ def test_list_waiting_participants_empty(settings):
 @mock.patch.object(
     utils, "generate_livekit_config", return_value={"token": "test-token"}
 )
-def test_request_entry_throttling_anonymous_without_cookie(
+def test_request_entry_throttling_anonymous_unidentified(
     mock_notify_participants, mock_generate_livekit_config, settings
 ):
-    """Anonymous users without a cookie should not be throttled."""
+    """Requests without a participant identifier should not be throttled."""
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     client = APIClient()
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.REST_FRAMEWORK["DEFAULT_THROTTLE_RATES"]["request_entry"] = "1/minute"
 
     response = client.post(
@@ -654,9 +626,6 @@ def test_request_entry_throttling_anonymous_without_cookie(
     )
 
     assert response.status_code == 200
-    assert response.cookies.get("mocked-cookie") is not None
-
-    client.cookies.clear()  # Simulate a new cookieless request
 
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/request-entry/",
@@ -670,34 +639,32 @@ def test_request_entry_throttling_anonymous_without_cookie(
 @mock.patch.object(
     utils, "generate_livekit_config", return_value={"token": "test-token"}
 )
-def test_request_entry_throttling_anonymous_with_cookie(
+def test_request_entry_throttling_anonymous_identified(
     mock_notify_participants, mock_generate_livekit_config, settings
 ):
-    """Anonymous users with a cookie should be throttled after exceeding the rate limit."""
+    """Identified requests should be throttled after exceeding the rate limit."""
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     client = APIClient()
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.REST_FRAMEWORK["DEFAULT_THROTTLE_RATES"]["request_entry"] = "2/minute"
 
     participant_id = str(uuid.uuid4())
-    client.cookies.load({"mocked-cookie": participant_id})
 
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/request-entry/",
-        {"username": "test_user"},
+        {"username": "test_user", "participant_id": participant_id},
     )
     assert response.status_code == 200
 
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/request-entry/",
-        {"username": "test_user"},
+        {"username": "test_user", "participant_id": participant_id},
     )
     assert response.status_code == 200
 
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/request-entry/",
-        {"username": "test_user"},
+        {"username": "test_user", "participant_id": participant_id},
     )
 
     assert response.status_code == 429
@@ -716,7 +683,6 @@ def test_request_entry_throttling_authenticated_user(
     client = APIClient()
     client.force_login(user)
 
-    settings.LOBBY_COOKIE_NAME = "mocked-cookie"
     settings.REST_FRAMEWORK["DEFAULT_THROTTLE_RATES"]["request_entry"] = "2/minute"
 
     response = client.post(
@@ -737,3 +703,124 @@ def test_request_entry_throttling_authenticated_user(
     )
 
     assert response.status_code == 429
+
+
+def test_request_entry_with_participant_id(settings):
+    """Echoing the previously issued identifier preserves the lobby identity across requests."""
+    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    client = APIClient()
+
+    settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
+
+    with (
+        mock.patch.object(utils, "notify_participants", return_value=None),
+        mock.patch.object(utils, "generate_color", return_value="mocked-color"),
+    ):
+        response = client.post(
+            f"/api/v1.0/rooms/{room.id}/request-entry/",
+            {"username": "test_user"},
+        )
+
+        assert response.status_code == 200
+        participant_id = response.json()["id"]
+
+        # Echoing the identifier must be recognized as the same
+        # participant: no duplicate in the lobby
+        response = client.post(
+            f"/api/v1.0/rooms/{room.id}/request-entry/",
+            {"username": "test_user", "participant_id": participant_id},
+        )
+
+    assert response.status_code == 200
+    assert response.json()["id"] == participant_id
+    assert response.json()["status"] == "waiting"
+
+    lobby_keys = cache.keys(f"mocked-cache-prefix_{room.id}_*")
+    assert len(lobby_keys) == 1
+
+
+def test_request_entry_unknown_participant_id_not_seeded(settings):
+    """An identifier unknown to the room's lobby must not be honored."""
+    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    client = APIClient()
+
+    settings.LOBBY_KEY_PREFIX = "mocked-cache-prefix"
+
+    forged_id = str(uuid.uuid4())
+
+    with (
+        mock.patch.object(utils, "notify_participants", return_value=None),
+        mock.patch.object(utils, "generate_color", return_value="mocked-color"),
+    ):
+        response = client.post(
+            f"/api/v1.0/rooms/{room.id}/request-entry/",
+            {"username": "test_user", "participant_id": forged_id},
+        )
+
+    assert response.status_code == 200
+    assert response.json()["id"] != forged_id
+
+    # Nothing was stored under the forged identifier
+    assert cache.get(f"mocked-cache-prefix_{room.id}_{forged_id}") is None
+
+
+def test_request_entry_participant_id_bound_to_room(settings):
+    """An identifier minted for one room must not be honored in another."""
+    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    other_room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    client = APIClient()
+
+    with (
+        mock.patch.object(utils, "notify_participants", return_value=None),
+        mock.patch.object(utils, "generate_color", return_value="mocked-color"),
+    ):
+        response = client.post(
+            f"/api/v1.0/rooms/{room.id}/request-entry/",
+            {"username": "test_user"},
+        )
+        participant_id = response.json()["id"]
+
+        response = client.post(
+            f"/api/v1.0/rooms/{other_room.id}/request-entry/",
+            {"username": "test_user", "participant_id": participant_id},
+        )
+
+    assert response.status_code == 200
+    assert response.json()["id"] != participant_id
+
+
+def test_request_entry_legacy_cookie_ignored():
+    """The retired cookie channel must not be honored anymore."""
+    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    client = APIClient()
+
+    legacy_participant_id = str(uuid.uuid4())
+    client.cookies["lobbyParticipantId"] = legacy_participant_id
+
+    with (
+        mock.patch.object(utils, "notify_participants", return_value=None),
+        mock.patch.object(utils, "generate_color", return_value="mocked-color"),
+    ):
+        response = client.post(
+            f"/api/v1.0/rooms/{room.id}/request-entry/",
+            {"username": "test_user"},
+        )
+
+    assert response.status_code == 200
+    returned_id = response.json()["id"]
+    assert returned_id != legacy_participant_id
+    uuid.UUID(returned_id)
+
+
+def test_request_entry_malformed_participant_id(settings):
+    """A non-UUID identifier is rejected by the serializer with a 400."""
+    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    client = APIClient()
+
+    response = client.post(
+        f"/api/v1.0/rooms/{room.id}/request-entry/",
+        {"username": "test_user", "participant_id": "../../../evil-key"},
+    )
+
+    assert response.status_code == 400
+    assert "participant_id" in response.json()

src/backend/core/tests/rooms/test_api_rooms_participants_management.py

@@ -20,7 +20,11 @@ from rest_framework.test import APIClient
 
 from core import utils
 from core.factories import RoomFactory, UserFactory, UserResourceAccessFactory
-from core.services.lobby import LobbyService
+from core.services.lobby import (
+    LobbyParticipant,
+    LobbyParticipantStatus,
+    LobbyService,
+)
 
 pytestmark = pytest.mark.django_db
 
@@ -87,7 +91,7 @@ def test_mute_participant_with_livekit_token_for_this_room(mock_livekit_client):
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -113,7 +117,7 @@ def test_mute_participant_with_livekit_token_for_another_room_forbidden(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -153,7 +157,7 @@ def test_mute_participant_everyone_can_mute_disabled_blocks_non_admin(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -300,7 +304,7 @@ def test_mute_participant_admin_with_token_for_this_room(mock_livekit_client):
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -330,7 +334,7 @@ def test_mute_participant_admin_with_token_for_another_room(mock_livekit_client)
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -361,7 +365,7 @@ def test_mute_participant_admin_token_replayed_does_not_grant_admin(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -381,7 +385,7 @@ def test_mute_participant_livekit_token_triggers_presence_check(mock_livekit_cli
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -412,7 +416,7 @@ def test_mute_participant_livekit_token_presence_check_returns_participant(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -440,7 +444,7 @@ def test_mute_participant_livekit_token_presence_check_participant_not_found(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -469,7 +473,7 @@ def test_mute_participant_livekit_token_presence_check_twirp_error_forbidden(
         url,
         {"participant_identity": str(uuid4()), "track_sid": "test-track-sid"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -849,7 +853,15 @@ def test_remove_participant_success_lobby_cache(mock_livekit_client):
     participant_identity = str(uuid4())
 
     # Create participant in lobby cache first
-    LobbyService().enter(room.id, participant_identity, "John doe")
+    LobbyService()._save_participant(
+        room.id,
+        LobbyParticipant(
+            id=participant_identity,
+            username="John doe",
+            status=LobbyParticipantStatus.WAITING,
+            color="#123456",
+        ),
+    )
 
     # Accept participant
     LobbyService().handle_participant_entry(room.id, participant_identity, True)
@@ -1020,3 +1032,6 @@ def test_remove_participant_not_found(mock_livekit_client):
     assert response.data == {"error": "Participant not found"}
 
     mock_livekit_client.aclose.assert_called_once()
+
+
+# todo - try to pass another scheme to make sure it defers to the next auth

src/backend/core/tests/rooms/test_api_rooms_rename_toggle.py

@@ -69,7 +69,10 @@ def test_toggle_hand_raise_success(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -84,7 +87,10 @@ def test_toggle_hand_lower_success(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     response = client.post(
-        url, {"raised": False}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": False},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -101,7 +107,10 @@ def test_toggle_hand_raise_sets_timestamp(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -117,7 +126,10 @@ def test_toggle_hand_identity_derived_from_token(
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -128,7 +140,9 @@ def test_toggle_hand_missing_raised_field(room, token):
     """Test toggle hand with missing raised field returns 400."""
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
-    response = client.post(url, {}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post(
+        url, {}, format="json", HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}"
+    )
 
     assert response.status_code == status.HTTP_400_BAD_REQUEST
     assert "raised" in response.data
@@ -142,7 +156,7 @@ def test_toggle_hand_invalid_raised_field(room, token):
         url,
         {"raised": "not-a-boolean"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_400_BAD_REQUEST
@@ -166,7 +180,10 @@ def test_toggle_hand_forbidden_token_for_wrong_room(user):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": target_room.id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {wrong_token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {wrong_token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -181,7 +198,10 @@ def test_toggle_hand_unexpected_twirp_error(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
@@ -200,7 +220,7 @@ def test_toggle_hand_raise_success_anonymous(
         url,
         {"raised": True},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -220,7 +240,7 @@ def test_toggle_hand_lower_success_anonymous(
         url,
         {"raised": False},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -240,7 +260,7 @@ def test_toggle_hand_identity_derived_from_token_anonymous(
         url,
         {"raised": True},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -257,7 +277,10 @@ def test_rename_participant_success(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     response = client.post(
-        url, {"name": "John Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "John Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -272,7 +295,10 @@ def test_rename_participant_sets_correct_name(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     client.post(
-        url, {"name": "Jane Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "Jane Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -286,7 +312,10 @@ def test_rename_participant_uses_identity_from_token(
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     client.post(
-        url, {"name": "John Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "John Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -298,7 +327,7 @@ def test_rename_participant_empty_name(room, token):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     response = client.post(
-        url, {"name": ""}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url, {"name": ""}, format="json", HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}"
     )
 
     assert response.status_code == status.HTTP_400_BAD_REQUEST
@@ -309,7 +338,9 @@ def test_rename_participant_missing_name(room, token):
     """Test rename with missing name field returns 400."""
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
-    response = client.post(url, {}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post(
+        url, {}, format="json", HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}"
+    )
 
     assert response.status_code == status.HTTP_400_BAD_REQUEST
     assert "name" in response.data
@@ -320,7 +351,10 @@ def test_rename_participant_name_too_long(room, token):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     response = client.post(
-        url, {"name": "a" * 256}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "a" * 256},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_400_BAD_REQUEST
@@ -348,7 +382,7 @@ def test_rename_participant_forbidden_token_for_wrong_room(user):
         url,
         {"name": "John Doe"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {wrong_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {wrong_token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -363,7 +397,10 @@ def test_rename_participant_unexpected_twirp_error(mock_livekit_client, room, to
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     response = client.post(
-        url, {"name": "John Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "John Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
@@ -382,7 +419,7 @@ def test_rename_participant_success_anonymous(
         url,
         {"name": "Guest User"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     assert response.status_code == status.HTTP_200_OK
@@ -402,7 +439,7 @@ def test_rename_participant_uses_identity_from_token_anonymous(
         url,
         {"name": "Guest User"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -419,7 +456,7 @@ def test_rename_participant_sets_correct_name_anonymous(
         url,
         {"name": "Guest User"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     call_kwargs = mock_livekit_client.room.update_participant.call_args
@@ -436,7 +473,7 @@ def test_rename_participant_forbidden_anonymous_token_for_wrong_room(anonymous_t
         url,
         {"name": "Guest User"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {anonymous_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {anonymous_token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -462,7 +499,7 @@ def test_toggle_hand_expired_token(room, expired_token):
         url,
         {"raised": True},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {expired_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {expired_token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -476,7 +513,7 @@ def test_rename_participant_expired_token(room, expired_token):
         url,
         {"name": "John Doe"},
         format="json",
-        HTTP_AUTHORIZATION=f"Bearer {expired_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {expired_token}",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -490,7 +527,7 @@ def test_toggle_hand_malformed_token(room):
         url,
         {"raised": True},
         format="json",
-        HTTP_AUTHORIZATION="Bearer this-is-not-a-valid-jwt",
+        HTTP_AUTHORIZATION="X-LiveKit-Token this-is-not-a-valid-jwt",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -504,7 +541,10 @@ def test_toggle_hand_room_not_found(user):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": non_existent_room_id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_404_NOT_FOUND
@@ -519,7 +559,10 @@ def test_toggle_hand_participant_not_found(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-toggle-hand", kwargs={"pk": room.id})
     response = client.post(
-        url, {"raised": True}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"raised": True},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_404_NOT_FOUND
@@ -536,7 +579,7 @@ def test_rename_participant_malformed_token(room):
         url,
         {"name": "John Doe"},
         format="json",
-        HTTP_AUTHORIZATION="Bearer this-is-not-a-valid-jwt",
+        HTTP_AUTHORIZATION="X-LiveKit-Token this-is-not-a-valid-jwt",
     )
 
     assert response.status_code == status.HTTP_403_FORBIDDEN
@@ -550,7 +593,10 @@ def test_rename_participant_room_not_found(user):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": non_existent_room_id})
     response = client.post(
-        url, {"name": "John Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "John Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_404_NOT_FOUND
@@ -565,10 +611,16 @@ def test_rename_participant_not_found(mock_livekit_client, room, token):
     client = APIClient()
     url = reverse("rooms-rename", kwargs={"pk": room.id})
     response = client.post(
-        url, {"name": "John Doe"}, format="json", HTTP_AUTHORIZATION=f"Bearer {token}"
+        url,
+        {"name": "John Doe"},
+        format="json",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {token}",
     )
 
     assert response.status_code == status.HTTP_404_NOT_FOUND
     assert response.data == {"error": "Participant not found"}
 
     mock_livekit_client.aclose.assert_called_once()
+
+
+# todo - try to pass another scheme to make sure it defers to the next auth

src/backend/core/tests/rooms/test_api_rooms_retrieve.py

@@ -3,11 +3,14 @@ Test rooms API endpoints in the Meet core app: retrieve.
 """
 
 import random
+from datetime import datetime, timedelta, timezone
 from unittest import mock
 
+from django.conf import settings as django_settings
 from django.contrib.auth.models import AnonymousUser
 from django.test.utils import override_settings
 
+import jwt
 import pytest
 from rest_framework.test import APIClient
 
@@ -507,3 +510,40 @@ def test_api_rooms_retrieve_administrators(
         role=str(user_access.role),
         participant_id=None,
     )
+
+
+def generate_user_access_token(user):
+    """Generate a valid user access JWT signed with the token secret."""
+    now = datetime.now(timezone.utc)
+
+    payload = {
+        "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+        "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+        "iat": now,
+        "exp": now + timedelta(seconds=django_settings.USER_ACCESS_TOKEN_TTL),
+        "user_id": str(user.id),
+        "token_type": "user_access",
+        "client_id": "test-app",
+        "scope": "user:access",
+    }
+
+    return jwt.encode(
+        payload,
+        django_settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+
+
+def test_api_rooms_retrieve_authenticated_with_user_access_token():
+    """A user access token should retrieve a room exactly like a session would."""
+    user = UserFactory()
+    room = RoomFactory(users=[(user, "owner")])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+    response = client.get(f"/api/v1.0/rooms/{room.id!s}/")
+
+    assert response.status_code == 200
+    assert response.data["id"] == str(room.id)
+    # Authenticated as the owner: privileged fields are included
+    assert response.data["pin_code"] == room.pin_code

src/backend/core/tests/rooms/test_api_rooms_subtitle.py

@@ -110,7 +110,7 @@ def test_start_subtitle_invalid_token():
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION="Bearer invalid-token",
+        HTTP_AUTHORIZATION="X-LiveKit-Token invalid-token",
     )
 
     assert response.status_code == 403
@@ -128,7 +128,7 @@ def test_start_subtitle_disabled_by_default(mock_livekit_token):
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION=f"Bearer {mock_livekit_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {mock_livekit_token}",
     )
 
     assert response.status_code == 404
@@ -148,7 +148,7 @@ def test_start_subtitle_valid_token(
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION=f"Bearer {mock_livekit_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {mock_livekit_token}",
     )
 
     assert response.status_code == 200
@@ -178,7 +178,7 @@ def test_start_subtitle_twirp_error(
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION=f"Bearer {mock_livekit_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {mock_livekit_token}",
     )
 
     assert response.status_code == 500
@@ -198,7 +198,7 @@ def test_start_subtitle_wrong_room(settings, mock_livekit_token):
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION=f"Bearer {mock_livekit_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {mock_livekit_token}",
     )
 
     assert response.status_code == 403
@@ -219,10 +219,13 @@ def test_start_subtitle_wrong_signature(settings, mock_livekit_token):
     response = client.post(
         f"/api/v1.0/rooms/{room.id}/start-subtitle/",
         {},
-        HTTP_AUTHORIZATION=f"Bearer {mock_livekit_token}",
+        HTTP_AUTHORIZATION=f"X-LiveKit-Token {mock_livekit_token}",
     )
 
     assert response.status_code == 403
     assert response.json() == {
         "detail": "Invalid LiveKit token: Signature verification failed"
     }
+
+
+# todo - try to pass another scheme to make sure it defers to the next auth

src/backend/core/tests/rooms/test_api_rooms_update.py

@@ -3,8 +3,12 @@ Test rooms API endpoints in the Meet core app: update.
 """
 
 import random
+from datetime import datetime, timedelta, timezone
 from unittest.mock import patch
 
+from django.conf import settings as django_settings
+
+import jwt
 import pytest
 from rest_framework.test import APIClient
 
@@ -437,3 +441,45 @@ def test_api_rooms_update_livekit_sync_failure(mock_update_metadata):
             "configuration": {"can_publish_sources": ["camera"]},
         },
     )
+
+
+def generate_user_access_token(user):
+    """Generate a valid user access JWT signed with the token secret."""
+    now = datetime.now(timezone.utc)
+
+    payload = {
+        "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+        "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+        "iat": now,
+        "exp": now + timedelta(seconds=django_settings.USER_ACCESS_TOKEN_TTL),
+        "user_id": str(user.id),
+        "token_type": "user_access",
+        "client_id": "test-app",
+        "scope": "user:access",
+    }
+
+    return jwt.encode(
+        payload,
+        django_settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+
+
+def test_api_rooms_update_authenticated_with_user_access_token():
+    """Role-based permissions apply unchanged with a user access token."""
+    user = UserFactory()
+    room = RoomFactory(users=[(user, "member")])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+
+    # A simple member cannot update the room
+    response = client.patch(f"/api/v1.0/rooms/{room.id!s}/", {"name": "new name"})
+    assert response.status_code == 403
+
+    # An administrator can
+    room.accesses.filter(user=user).update(role="administrator")
+    response = client.patch(f"/api/v1.0/rooms/{room.id!s}/", {"name": "new name"})
+    assert response.status_code == 200
+    room.refresh_from_db()
+    assert room.name == "new name"

src/backend/core/tests/services/test_livekit_events.py

@@ -720,6 +720,7 @@ def test_receive_unsupported_event(mock_receive, service):
 
     # Mock returned data with unsupported event type
     mock_data = mock.MagicMock()
+    mock_data.room.name = str(uuid.uuid4())
     mock_data.event = "unsupported_event"
     mock_receive.return_value = mock_data
 
@@ -823,3 +824,33 @@ def test_receive_filter_processes_matching_events(
     service.receive(mock_request)
 
     mock_handle_room_started.assert_called_once()
+
+
+@mock.patch.object(api.WebhookReceiver, "receive")
+@mock.patch.object(LiveKitEventsService, "_handle_room_finished")
+@mock.patch.object(LiveKitEventsService, "_handle_room_started")
+def test_receive_ignores_connection_test_room(
+    mock_handle_room_started,
+    mock_handle_room_finished,
+    mock_receive,
+    mock_livekit_config,
+    settings,
+):
+    """Should ignore all webhook events for connection test rooms in receive()."""
+
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+
+    mock_request = mock.MagicMock()
+    mock_request.headers = {"Authorization": "test_token"}
+    mock_request.body = b"{}"
+
+    mock_data = mock.MagicMock()
+    mock_data.room.name = f"{settings.CONNECTION_TEST_ROOM_PREFIX}-{uuid.uuid4()}"
+    mock_data.event = "room_started"
+    mock_receive.return_value = mock_data
+
+    service = LiveKitEventsService()
+    service.receive(mock_request)
+
+    mock_handle_room_started.assert_not_called()
+    mock_handle_room_finished.assert_not_called()

src/backend/core/tests/services/test_lobby.py

@@ -3,7 +3,6 @@ Test lobby service.
 """
 
 # pylint: disable=W0621,W0613, W0212, R0913
-# ruff: noqa: PLR0913, PLR0917
 
 import uuid
 from unittest import mock
@@ -11,7 +10,6 @@ from unittest import mock
 from django.conf import settings
 from django.contrib.auth.models import AnonymousUser
 from django.core.cache import cache
-from django.http import HttpResponse
 
 import pytest
 
@@ -135,59 +133,6 @@ def test_get_cache_key(lobby_service, participant_id):
     assert cache_key == expected_key
 
 
-def test_get_or_create_participant_id_from_cookie(lobby_service):
-    """Test extracting participant ID from cookie."""
-    request = mock.Mock()
-    request.COOKIES = {settings.LOBBY_COOKIE_NAME: "existing-id"}
-
-    participant_id = lobby_service._get_or_create_participant_id(request)
-
-    assert participant_id == "existing-id"
-
-
-@mock.patch.object(uuid, "uuid4", return_value="generated-id")
-def test_get_or_create_participant_id_new(mock_uuid4, lobby_service):
-    """Test creating new participant ID when cookie is missing."""
-    request = mock.Mock()
-    request.COOKIES = {}
-
-    participant_id = lobby_service._get_or_create_participant_id(request)
-
-    assert participant_id == "generated-id"
-    mock_uuid4.assert_called_once()
-
-
-def test_prepare_response_existing_cookie(lobby_service, participant_id):
-    """Test response preparation with existing cookie."""
-    response = HttpResponse()
-    response.cookies[settings.LOBBY_COOKIE_NAME] = "existing-cookie"
-
-    lobby_service.prepare_response(response, participant_id)
-
-    # Verify cookie wasn't set again
-    cookie = response.cookies.get(settings.LOBBY_COOKIE_NAME)
-    assert cookie.value == "existing-cookie"
-    assert cookie.value != participant_id
-
-
-def test_prepare_response_new_cookie(lobby_service, participant_id):
-    """Test response preparation with new cookie."""
-    response = HttpResponse()
-
-    lobby_service.prepare_response(response, participant_id)
-
-    # Verify cookie was set
-    cookie = response.cookies.get(settings.LOBBY_COOKIE_NAME)
-    assert cookie is not None
-    assert cookie.value == participant_id
-    assert cookie["httponly"] is True
-    assert cookie["secure"] is True
-    assert cookie["samesite"] == "Lax"
-
-    # It's a session cookies (no max_age specified):
-    assert not cookie["max-age"]
-
-
 def test_can_bypass_lobby_public_room(lobby_service):
     """Should return True for public rooms regardless of user auth and role."""
     room = RoomFactory(access_level=RoomAccessLevel.PUBLIC)
@@ -266,11 +211,12 @@ def test_request_entry_public_room(
         color="#123456",
     )
 
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=mocked_participant)
     mock_generate_config.return_value = {"token": "test-token"}
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=participant_id
+    )
 
     assert participant.status == LobbyParticipantStatus.ACCEPTED
     assert livekit_config == {"token": "test-token"}
@@ -304,11 +250,12 @@ def test_request_entry_trusted_room(
         color="#123456",
     )
 
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=mocked_participant)
     mock_generate_config.return_value = {"token": "test-token"}
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=participant_id
+    )
 
     assert participant.status == LobbyParticipantStatus.ACCEPTED
     assert livekit_config == {"token": "test-token"}
@@ -325,18 +272,19 @@ def test_request_entry_trusted_room(
     lobby_service._get_participant.assert_called_once_with(room.id, participant_id)
 
 
-@mock.patch("core.services.lobby.LobbyService.enter")
+@mock.patch("core.services.lobby.LobbyService._notify_entry_request")
+@mock.patch("core.services.lobby.LobbyService._create_participant")
 def test_request_entry_new_participant(
-    mock_enter, lobby_service, participant_id, username
+    mock_create, mock_notify, lobby_service, participant_id, username
 ):
-    """Test requesting entry for a new participant."""
+    """A new participant gets a server-minted identifier - any provided
+    one is unknown to the lobby and therefore discarded - and the room is
+    notified of the entry request."""
     request = mock.Mock()
-    request.COOKIES = {settings.LOBBY_COOKIE_NAME: participant_id}
     request.user = AnonymousUser()
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
 
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=None)
 
     participant_data = LobbyParticipant(
@@ -345,14 +293,20 @@ def test_request_entry_new_participant(
         id=participant_id,
         color="#123456",
     )
-    mock_enter.return_value = participant_data
+    mock_create.return_value = participant_data
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    forged_id = str(uuid.uuid4())
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=forged_id
+    )
 
     assert participant == participant_data
     assert livekit_config is None
-    mock_enter.assert_called_once_with(room.id, participant_id, username)
-    lobby_service._get_participant.assert_called_once_with(room.id, participant_id)
+    # The provided identifier was looked up, found unknown, and replaced
+    # by a freshly minted participant
+    lobby_service._get_participant.assert_called_once_with(room.id, forged_id)
+    mock_create.assert_called_once_with(room.id, username)
+    mock_notify.assert_called_once_with(str(room.id))
 
 
 @mock.patch("core.services.lobby.LobbyService.refresh_waiting_status")
@@ -361,7 +315,6 @@ def test_request_entry_waiting_participant(
 ):
     """Test requesting entry for a waiting participant."""
     request = mock.Mock()
-    request.COOKIES = {settings.LOBBY_COOKIE_NAME: participant_id}
     request.user = AnonymousUser()
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
@@ -372,10 +325,11 @@ def test_request_entry_waiting_participant(
         id=participant_id,
         color="#123456",
     )
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=mocked_participant)
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=participant_id
+    )
 
     assert participant.status == LobbyParticipantStatus.WAITING
     assert livekit_config is None
@@ -390,7 +344,6 @@ def test_request_entry_accepted_participant(
     """Test requesting entry for an accepted participant."""
     request = mock.Mock()
     request.user = AnonymousUser()
-    request.COOKIES = {settings.LOBBY_COOKIE_NAME: participant_id}
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
 
@@ -400,12 +353,13 @@ def test_request_entry_accepted_participant(
         id=participant_id,
         color="#123456",
     )
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=mocked_participant)
 
     mock_generate_config.return_value = {"token": "test-token"}
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=participant_id
+    )
 
     assert participant.status == LobbyParticipantStatus.ACCEPTED
     assert livekit_config == {"token": "test-token"}
@@ -428,7 +382,6 @@ def test_request_entry_participant_with_role(
     """Test requesting entry for a participant with a role on the room."""
     request = mock.Mock()
     request.user = UserFactory()
-    request.COOKIES = {settings.LOBBY_COOKIE_NAME: participant_id}
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
 
@@ -440,12 +393,13 @@ def test_request_entry_participant_with_role(
         id=participant_id,
         color="#123456",
     )
-    lobby_service._get_or_create_participant_id = mock.Mock(return_value=participant_id)
     lobby_service._get_participant = mock.Mock(return_value=mocked_participant)
 
     mock_generate_config.return_value = {"token": "test-token"}
 
-    participant, livekit_config = lobby_service.request_entry(room, request, username)
+    participant, livekit_config = lobby_service.request_entry(
+        room, request, username, participant_id=participant_id
+    )
 
     assert participant.status == LobbyParticipantStatus.ACCEPTED
     assert livekit_config == {"token": "test-token"}
@@ -472,73 +426,47 @@ def test_refresh_waiting_status(mock_cache, lobby_service, participant_id):
     )
 
 
-# pylint: disable=R0917
 @mock.patch("core.services.lobby.cache")
 @mock.patch("core.utils.generate_color")
-@mock.patch("core.utils.notify_participants")
-def test_enter_success(
-    mock_notify,
+def test_create_participant(
     mock_generate_color,
     mock_cache,
     lobby_service,
-    participant_id,
     username,
+    settings,
 ):
-    """Test successful participant entry."""
+    """A created participant is waiting, colored, and persisted."""
     mock_generate_color.return_value = "#123456"
     lobby_service._get_cache_key = mock.Mock(return_value="mocked_cache_key")
 
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
-    participant = lobby_service.enter(room.id, participant_id, username)
+    participant = lobby_service._create_participant(room.id, username)
 
-    mock_generate_color.assert_called_once_with(participant_id)
+    # The identifier is minted server-side
+    uuid.UUID(participant.id)
+    mock_generate_color.assert_called_once_with(participant.id)
     assert participant.status == LobbyParticipantStatus.WAITING
     assert participant.username == username
-    assert participant.id == participant_id
     assert participant.color == "#123456"
 
-    lobby_service._get_cache_key.assert_called_once_with(room.id, participant_id)
+    lobby_service._get_cache_key.assert_called_once_with(room.id, participant.id)
 
     mock_cache.set.assert_called_once_with(
         "mocked_cache_key",
         participant.to_dict(),
         timeout=settings.LOBBY_WAITING_TIMEOUT,
     )
-    mock_notify.assert_called_once_with(
-        room_name=str(room.pk), notification_data={"type": "participantWaiting"}
-    )
 
 
-# pylint: disable=R0917
-@mock.patch("core.services.lobby.cache")
-@mock.patch("core.utils.generate_color")
 @mock.patch("core.utils.notify_participants")
-def test_enter_with_notification_error(
-    mock_notify,
-    mock_generate_color,
-    mock_cache,
-    lobby_service,
-    participant_id,
-    username,
-):
-    """Test participant entry with notification error."""
-    mock_generate_color.return_value = "#123456"
+def test_notify_entry_request_with_notification_error(mock_notify, lobby_service):
+    """A notification error must not break the entry request flow."""
     mock_notify.side_effect = NotificationError("Error notifying")
-    lobby_service._get_cache_key = mock.Mock(return_value="mocked_cache_key")
 
-    room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
-    participant = lobby_service.enter(room.id, participant_id, username)
+    lobby_service._notify_entry_request("room-id")
 
-    mock_generate_color.assert_called_once_with(participant_id)
-    assert participant.status == LobbyParticipantStatus.WAITING
-    assert participant.username == username
-
-    lobby_service._get_cache_key.assert_called_once_with(room.id, participant_id)
-
-    mock_cache.set.assert_called_once_with(
-        "mocked_cache_key",
-        participant.to_dict(),
-        timeout=settings.LOBBY_WAITING_TIMEOUT,
+    mock_notify.assert_called_once_with(
+        room_name="room-id", notification_data={"type": "participantWaiting"}
     )
 
 

src/backend/core/tests/services/test_room_management.py

@@ -0,0 +1,60 @@
+"""Tests for the RoomManagement service."""
+
+from unittest import mock
+
+import pytest
+from livekit.api import TwirpError
+
+from core.services.room_management import (
+    RoomManagement,
+    RoomManagementException,
+    RoomNotFoundException,
+)
+
+
+@mock.patch("core.services.room_management.utils.create_livekit_client")
+def test_delete_room_calls_livekit(mock_create_livekit_client):
+    """DeleteRoom is forwarded to the LiveKit API."""
+    mock_api = mock.MagicMock()
+    mock_api.room.delete_room = mock.AsyncMock()
+    mock_api.aclose = mock.AsyncMock()
+    mock_create_livekit_client.return_value = mock_api
+
+    RoomManagement().delete_room("room-abc")
+
+    mock_api.room.delete_room.assert_awaited_once()
+    request = mock_api.room.delete_room.await_args.args[0]
+    assert request.room == "room-abc"
+    mock_api.aclose.assert_awaited_once()
+
+
+@mock.patch("core.services.room_management.utils.create_livekit_client")
+def test_delete_room_raises_not_found(mock_create_livekit_client):
+    """Missing rooms raise RoomNotFoundException."""
+    mock_api = mock.MagicMock()
+    mock_api.room.delete_room = mock.AsyncMock(
+        side_effect=TwirpError("not_found", "room not found", status=404)
+    )
+    mock_api.aclose = mock.AsyncMock()
+    mock_create_livekit_client.return_value = mock_api
+
+    with pytest.raises(RoomNotFoundException):
+        RoomManagement().delete_room("missing-room")
+
+    mock_api.aclose.assert_awaited_once()
+
+
+@mock.patch("core.services.room_management.utils.create_livekit_client")
+def test_delete_room_raises_management_exception(mock_create_livekit_client):
+    """Unexpected Twirp errors raise RoomManagementException."""
+    mock_api = mock.MagicMock()
+    mock_api.room.delete_room = mock.AsyncMock(
+        side_effect=TwirpError("internal", "boom", status=500)
+    )
+    mock_api.aclose = mock.AsyncMock()
+    mock_create_livekit_client.return_value = mock_api
+
+    with pytest.raises(RoomManagementException):
+        RoomManagement().delete_room("room-abc")
+
+    mock_api.aclose.assert_awaited_once()

src/backend/core/tests/services/test_transit_code.py

@@ -0,0 +1,46 @@
+"""
+Unit tests for the TransitCodeService.
+"""
+
+import pytest
+
+from core.factories import UserFactory
+from core.services.transit_code import TransitCodeService
+
+pytestmark = pytest.mark.django_db
+
+
+def test_create_code_returns_unique_opaque_codes():
+    """Each created code should be a distinct high-entropy string."""
+    user = UserFactory()
+    service = TransitCodeService()
+
+    codes = {service.create_code(user) for _ in range(5)}
+
+    assert len(codes) == 5
+    for code in codes:
+        assert len(code) >= 43
+
+
+def test_consume_code_returns_stored_data_once():
+    """Consuming a code should return its data exactly once."""
+    user = UserFactory()
+    service = TransitCodeService()
+
+    code = service.create_code(user, client_id="my-app")
+
+    assert service.consume_code(code) == {
+        "user_id": str(user.id),
+        "client_id": "my-app",
+    }
+    # Single use: a second consumption fails
+    assert service.consume_code(code) is None
+
+
+def test_consume_code_unknown_or_empty():
+    """Unknown or empty codes should not be consumable."""
+    service = TransitCodeService()
+
+    assert service.consume_code("unknown-code") is None
+    assert service.consume_code("") is None
+    assert service.consume_code(None) is None

src/backend/core/tests/tasks/test_connection_test.py

@@ -0,0 +1,51 @@
+"""Tests for connection test Celery tasks."""
+
+from unittest import mock
+
+from django.test.utils import override_settings
+
+from core.services.room_management import (
+    RoomManagementException,
+    RoomNotFoundException,
+)
+from core.tasks.connection_test import delete_connection_test_room
+
+
+@mock.patch("core.tasks.connection_test.RoomManagement.delete_room")
+def test_delete_connection_test_room_calls_room_management(mock_delete_room, settings):
+    """RoomManagement.delete_room is called for connection-test rooms."""
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+    delete_connection_test_room("connection-test-abc")
+
+    mock_delete_room.assert_called_once_with("connection-test-abc")
+
+
+@mock.patch("core.tasks.connection_test.RoomManagement.delete_room")
+def test_delete_connection_test_room_refuses_other_rooms(mock_delete_room, settings):
+    """Refuse to delete rooms outside the connection-test namespace."""
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+    delete_connection_test_room("production-room")
+
+    mock_delete_room.assert_not_called()
+
+
+@mock.patch("core.tasks.connection_test.RoomManagement.delete_room")
+def test_delete_connection_test_room_ignores_missing_room(mock_delete_room, settings):
+    """Missing rooms are treated as already cleaned up."""
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+    mock_delete_room.side_effect = RoomNotFoundException("Room does not exist")
+
+    delete_connection_test_room("connection-test-gone")
+
+    mock_delete_room.assert_called_once_with("connection-test-gone")
+
+
+@mock.patch("core.tasks.connection_test.RoomManagement.delete_room")
+def test_delete_connection_test_room_logs_other_failures(mock_delete_room, settings):
+    """Unexpected LiveKit failures are swallowed after logging."""
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+    mock_delete_room.side_effect = RoomManagementException("Could not delete room")
+
+    delete_connection_test_room("connection-test-fail")
+
+    mock_delete_room.assert_called_once_with("connection-test-fail")

src/backend/core/tests/test_api_diagnostics.py

@@ -0,0 +1,166 @@
+"""Test diagnostics API endpoints."""
+
+import uuid
+from unittest import mock
+
+from django.test.utils import override_settings
+from django.urls import reverse
+
+import jwt
+import pytest
+from rest_framework.test import APIClient
+
+from core.api.throttling import (
+    ConnectionTestAnonRateThrottle,
+    ConnectionTestUserRateThrottle,
+)
+from core.factories import UserFactory
+
+pytestmark = pytest.mark.django_db
+
+
+def test_api_diagnostics_connection_url():
+    """The connection check is exposed under the diagnostics namespace."""
+    assert reverse("diagnostics-connection") == "/api/v1.0/diagnostics/connection/"
+
+
+def test_api_diagnostics_connection_rejects_get():
+    """Only POST is exposed, the endpoint has no side effect to trigger."""
+    client = APIClient()
+    response = client.get("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 405
+
+
+def test_api_diagnostics_connection_returns_ephemeral_livekit_config(settings, client):
+    """Each request gets a dedicated room and a short-lived token."""
+
+    settings.CONNECTION_TEST_TOKEN_TTL_SECONDS = 600
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+
+    response_a = client.post("/api/v1.0/diagnostics/connection/")
+    response_b = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response_a.status_code == 200
+    assert response_b.status_code == 200
+
+    data_a = response_a.json()
+    data_b = response_b.json()
+
+    room_a = data_a["livekit"]["room"]
+    room_b = data_b["livekit"]["room"]
+
+    assert room_a.startswith("connection-test-")
+    assert room_b.startswith("connection-test-")
+    uuid.UUID(room_a.removeprefix("connection-test-"))
+    uuid.UUID(room_b.removeprefix("connection-test-"))
+    assert room_a != room_b
+    assert data_a["livekit"]["url"]
+    assert data_a["livekit"]["token"]
+    assert data_a["livekit"]["expires_in"] == 600
+    assert data_a["livekit"]["token"] != data_b["livekit"]["token"]
+
+
+def test_api_diagnostics_connection_token_is_short_lived_for_user(settings, client):
+    """Connection test tokens expire quickly for users."""
+
+    settings.CONNECTION_TEST_TOKEN_TTL_SECONDS = 300
+
+    client = APIClient()
+    response = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 200
+
+    config = response.json()["livekit"]
+    payload = jwt.decode(
+        config["token"],
+        settings.LIVEKIT_CONFIGURATION["api_secret"],
+        algorithms=["HS256"],
+        options={"verify_exp": False},
+    )
+
+    assert config["expires_in"] == 300
+    assert payload["video"]["room"] == config["room"]
+    assert payload["name"] == "Connection Test"
+    assert payload["video"]["roomAdmin"] is False
+    assert payload["exp"] - payload["nbf"] == 300
+
+
+@override_settings()
+def test_api_diagnostics_connection_token_for_authenticated_user(settings, client):
+    """Logged-in users get a token bound to their own identity."""
+
+    settings.CONNECTION_TEST_TOKEN_TTL_SECONDS = 300
+
+    user = UserFactory()
+    client.force_login(user)
+
+    response = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 200
+
+    payload = jwt.decode(
+        response.json()["livekit"]["token"],
+        settings.LIVEKIT_CONFIGURATION["api_secret"],
+        algorithms=["HS256"],
+        options={"verify_exp": False},
+    )
+
+    assert payload["sub"] == str(user.sub)
+    assert payload["video"]["roomAdmin"] is False
+    assert payload["exp"] - payload["nbf"] == 300
+
+
+@mock.patch("core.api.viewsets.delete_connection_test_room.apply_async")
+def test_api_diagnostics_connection_schedules_room_deletion(
+    mock_apply_async, settings, client
+):
+    """When Celery is enabled, schedule a hard room delete after max age."""
+
+    settings.CELERY_ENABLED = True
+    settings.CONNECTION_TEST_TOKEN_TTL_SECONDS = 300
+    settings.CONNECTION_TEST_ROOM_EXTRA_AGE_SECONDS = 10
+    settings.CONNECTION_TEST_ROOM_PREFIX = "connection-test"
+
+    response = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 200
+    room = response.json()["livekit"]["room"]
+    mock_apply_async.assert_called_once_with(args=[room], countdown=310)
+
+
+@mock.patch("core.api.viewsets.delete_connection_test_room.apply_async")
+def test_api_diagnostics_connection_skips_room_deletion_without_celery(
+    mock_apply_async, settings, client
+):
+    """Without Celery, do not schedule deletion (apply_async would run immediately)."""
+
+    settings.CELERY_ENABLED = False
+    response = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 200
+    mock_apply_async.assert_not_called()
+
+
+@pytest.mark.parametrize(
+    "throttle_class",
+    [ConnectionTestAnonRateThrottle, ConnectionTestUserRateThrottle],
+)
+def test_api_diagnostics_connection_is_throttled(throttle_class, client):
+    """Both throttles stay wired to the action once routed through the viewset."""
+    with (
+        mock.patch.object(throttle_class, "allow_request", return_value=False),
+        mock.patch.object(throttle_class, "wait", return_value=42),
+    ):
+        response = client.post("/api/v1.0/diagnostics/connection/")
+
+    assert response.status_code == 429
+
+
+def test_api_diagnostics_connection_feature_flag(client, settings):
+    """Should return a not found error when the connection diagnostics feature is disabled."""
+
+    settings.CONNECTION_TEST_ENABLED = False
+
+    response = client.post("/api/v1.0/diagnostics/connection/")
+    assert response.status_code == 404

src/backend/core/tests/test_api_user_access_token_authentication.py

@@ -0,0 +1,200 @@
+"""
+Tests for user access JWT authentication on the core API.
+
+The token authenticates the user on the whole API, exactly like a session
+cookie would (similar to lib-jitsi-meet's token authentication): the
+existing role-based permissions apply unchanged. Room endpoint coverage
+with a user access token lives in the room test files.
+"""
+
+from datetime import datetime, timedelta, timezone
+
+from django.conf import settings as django_settings
+
+import jwt
+import pytest
+from rest_framework.test import APIClient
+
+from core.factories import RoomFactory, UserFactory
+from core.models import RoleChoices
+
+pytestmark = pytest.mark.django_db
+
+
+def generate_user_access_token(user, **overrides):
+    """Generate a valid user access JWT signed with the token secret."""
+    now = datetime.now(timezone.utc)
+
+    payload = {
+        "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+        "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+        "iat": now,
+        "exp": now + timedelta(seconds=django_settings.USER_ACCESS_TOKEN_TTL),
+        "user_id": str(user.id),
+        "token_type": "user_access",
+        "client_id": "test-app",
+        "scope": "user:access",
+    }
+    payload.update(overrides)
+    payload = {key: value for key, value in payload.items() if value is not None}
+
+    return jwt.encode(
+        payload,
+        django_settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+
+
+def test_user_access_token_users_me():
+    """A user access token should authenticate the user on /users/me/."""
+    user = UserFactory()
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 200
+    assert response.data["email"] == user.email
+
+
+def test_user_access_token_expired():
+    """An expired user access token should be rejected."""
+    user = UserFactory()
+
+    now = datetime.now(timezone.utc)
+    token = generate_user_access_token(
+        user,
+        iat=now - timedelta(hours=3),
+        exp=now - timedelta(hours=1),
+    )
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+    assert "token expired" in str(response.data).lower()
+
+
+def test_user_access_token_invalid_signature():
+    """A token signed with the wrong key should defer and end unauthenticated."""
+    user = UserFactory()
+
+    now = datetime.now(timezone.utc)
+    token = jwt.encode(
+        {
+            "iss": django_settings.USER_ACCESS_TOKEN_ISSUER,
+            "aud": django_settings.USER_ACCESS_TOKEN_AUDIENCE,
+            "iat": now,
+            "exp": now + timedelta(seconds=600),
+            "user_id": str(user.id),
+            "token_type": "user_access",
+            "client_id": "test-app",
+        },
+        "wrong-secret-key-padded-for-minimum-len!",
+        algorithm=django_settings.USER_ACCESS_TOKEN_ALG,
+    )
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+
+    # UserAccessJWTAuthentication defers, session auth finds no session
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+
+
+def test_user_access_token_wrong_token_type():
+    """A verified token with the wrong 'token_type' claim should be rejected."""
+    user = UserFactory()
+
+    token = generate_user_access_token(user, token_type="addons")
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+    assert "invalid token type" in str(response.data).lower()
+
+
+def test_user_access_token_missing_client_id_claim():
+    """A token without the issuance-audit claim should be rejected."""
+    user = UserFactory()
+
+    token = generate_user_access_token(user, client_id=None)
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+    assert "invalid token claims" in str(response.data).lower()
+
+
+def test_user_access_token_inactive_user():
+    """A user access token for an inactive user should be rejected."""
+    user = UserFactory(is_active=False)
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+
+
+def test_user_access_token_feature_disabled(settings):
+    """When the feature is disabled, user access tokens should be ignored."""
+    settings.USER_ACCESS_TOKEN_ENABLED = False
+
+    user = UserFactory()
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {generate_user_access_token(user)}")
+
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401
+
+
+def test_user_access_token_does_not_break_session_authentication():
+    """A session-authenticated user should keep full access to the API."""
+    user = UserFactory()
+    RoomFactory(users=[(user, RoleChoices.OWNER)])
+
+    client = APIClient()
+    client.force_login(user)
+    response = client.get("/api/v1.0/rooms/")
+
+    assert response.status_code == 200
+    assert response.data["count"] == 1
+
+
+def test_user_access_token_application_jwt_not_accepted_on_core_api():
+    """An application-delegation JWT must not authenticate on the core API."""
+    user = UserFactory()
+
+    now = datetime.now(timezone.utc)
+    token = jwt.encode(
+        {
+            "iss": django_settings.APPLICATION_JWT_ISSUER,
+            "aud": django_settings.APPLICATION_JWT_AUDIENCE,
+            "iat": now,
+            "exp": now + timedelta(seconds=600),
+            "user_id": str(user.id),
+            "client_id": "some-client",
+            "delegated": True,
+            "scope": "rooms:retrieve",
+        },
+        django_settings.APPLICATION_JWT_SECRET_KEY,
+        algorithm=django_settings.APPLICATION_JWT_ALG,
+    )
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+
+    # The user token backend must defer (wrong signature) and the request
+    # must end up unauthenticated.
+    response = client.get("/api/v1.0/users/me/")
+
+    assert response.status_code == 401

src/backend/core/tests/test_api_users_exchange_access_token.py

@@ -0,0 +1,165 @@
+"""
+Test users API endpoints in the Meet core app: exchange transit code.
+"""
+
+# pylint: disable=W0621
+
+import secrets
+
+import jwt
+import pytest
+from rest_framework.test import APIClient
+
+from core.factories import UserFactory
+from core.services.transit_code import TransitCodeService
+
+pytestmark = pytest.mark.django_db
+
+
+def decode_user_access_token(token, settings):
+    """Decode a user access token with the token secret."""
+    return jwt.decode(
+        token,
+        settings.USER_ACCESS_TOKEN_SECRET_KEY,
+        algorithms=[settings.USER_ACCESS_TOKEN_ALG],
+        issuer=settings.USER_ACCESS_TOKEN_ISSUER,
+        audience=settings.USER_ACCESS_TOKEN_AUDIENCE,
+    )
+
+
+def generate_unknown_code(settings):
+    """Generate a well-formed code that was never stored."""
+    return secrets.token_urlsafe(settings.TRANSIT_CODE_NBYTES)
+
+
+@pytest.fixture
+def client():
+    """Return an anonymous API client with a random source IP.
+
+    A fresh IP per test isolates the anonymous throttle history, both
+    between the tests of this module and between test runs.
+    """
+    # `secrets` rather than `random`: the global random module is seeded
+    # deterministically by the factories, its sequence repeats across runs.
+    remote_addr = (
+        f"10.{secrets.randbelow(256)}.{secrets.randbelow(256)}"
+        f".{secrets.randbelow(254) + 1}"
+    )
+    return APIClient(REMOTE_ADDR=remote_addr)
+
+
+def test_exchange_access_token_missing_code(client):
+    """The exchange endpoint should validate its input."""
+    response = client.post("/api/v1.0/users/exchange-access-token/")
+
+    assert response.status_code == 400
+    assert "code" in response.data
+
+
+def test_exchange_access_token_malformed_code(client):
+    """A code whose length cannot match a generated one should be a 400."""
+    response = client.post(
+        "/api/v1.0/users/exchange-access-token/",
+        {"code": "not-a-valid-code"},
+    )
+
+    assert response.status_code == 400
+    assert "invalid transit code format" in str(response.data).lower()
+
+
+def test_exchange_access_token_unknown_code(client, settings):
+    """A well-formed but unknown code should be denied."""
+    response = client.post(
+        "/api/v1.0/users/exchange-access-token/",
+        {"code": generate_unknown_code(settings)},
+    )
+
+    assert response.status_code == 403
+    assert "invalid, expired or already used" in str(response.data).lower()
+
+
+def test_exchange_access_token_success(client, settings):
+    """A valid transit code should be exchangeable for an access token."""
+    user = UserFactory()
+
+    code = TransitCodeService().create_code(user, client_id="my-app")
+
+    response = client.post("/api/v1.0/users/exchange-access-token/", {"code": code})
+
+    assert response.status_code == 200
+    assert response.data["token_type"] == settings.USER_ACCESS_TOKEN_TYPE
+    assert response.data["expires_in"] == settings.USER_ACCESS_TOKEN_TTL
+    assert response.data["scope"] == "user:access"
+
+    payload = decode_user_access_token(response.data["access_token"], settings)
+    assert payload["token_type"] == "user_access"
+    assert payload["user_id"] == str(user.id)
+    assert payload["client_id"] == "my-app"
+    assert payload["exp"] - payload["iat"] == settings.USER_ACCESS_TOKEN_TTL
+
+
+def test_exchange_access_token_single_use(client):
+    """A transit code should be exchangeable exactly once."""
+    user = UserFactory()
+
+    code = TransitCodeService().create_code(user)
+
+    response = client.post("/api/v1.0/users/exchange-access-token/", {"code": code})
+    assert response.status_code == 200
+
+    # Replaying the same code must be denied
+    response = client.post("/api/v1.0/users/exchange-access-token/", {"code": code})
+    assert response.status_code == 403
+    assert "invalid, expired or already used" in str(response.data).lower()
+
+
+def test_exchange_access_token_inactive_user(client):
+    """A code minted for a now-inactive user should be denied."""
+    user = UserFactory()
+
+    code = TransitCodeService().create_code(user)
+
+    user.is_active = False
+    user.save()
+
+    response = client.post("/api/v1.0/users/exchange-access-token/", {"code": code})
+
+    assert response.status_code == 403
+    assert "no longer access" in str(response.data).lower()
+
+
+def test_exchange_access_token_feature_disabled(client, settings):
+    """The exchange endpoint should return 404 when the feature is disabled."""
+    settings.USER_ACCESS_TOKEN_ENABLED = False
+
+    user = UserFactory()
+    code = TransitCodeService().create_code(user)
+
+    response = client.post("/api/v1.0/users/exchange-access-token/", {"code": code})
+
+    assert response.status_code == 404
+
+
+def test_exchange_access_token_throttled(client, settings):
+    """Anonymous exchange attempts should be rate limited."""
+    throttle_rates = settings.REST_FRAMEWORK["DEFAULT_THROTTLE_RATES"]
+    initial_rate = throttle_rates["exchange_access_token"]
+    # The rates dict is mutated in place: restore it explicitly, the
+    # `settings` fixture only rolls back attribute assignments.
+    throttle_rates["exchange_access_token"] = "2/minute"
+
+    try:
+        for _ in range(2):
+            response = client.post(
+                "/api/v1.0/users/exchange-access-token/",
+                {"code": generate_unknown_code(settings)},
+            )
+            assert response.status_code == 403
+
+        response = client.post(
+            "/api/v1.0/users/exchange-access-token/",
+            {"code": generate_unknown_code(settings)},
+        )
+        assert response.status_code == 429
+    finally:
+        throttle_rates["exchange_access_token"] = initial_rate

src/backend/core/tests/test_external_api_users.py

@@ -0,0 +1,166 @@
+"""
+Tests for external API /users endpoints (transit codes)
+"""
+
+# pylint: disable=W0621
+
+from datetime import datetime, timedelta, timezone
+from unittest import mock
+
+from django.conf import settings as django_settings
+
+import jwt
+import pytest
+from lasuite.oidc_resource_server.authentication import ResourceServerAuthentication
+from rest_framework.test import APIClient
+
+from core.factories import ApplicationFactory, UserFactory
+from core.models import ApplicationScope
+from core.services.transit_code import TransitCodeService
+
+pytestmark = pytest.mark.django_db
+
+
+def generate_test_token(user, scopes):
+    """Generate a valid application JWT token for testing."""
+    now = datetime.now(timezone.utc)
+    scope_string = " ".join(scopes)
+
+    application = ApplicationFactory()
+
+    payload = {
+        "iss": django_settings.APPLICATION_JWT_ISSUER,
+        "aud": django_settings.APPLICATION_JWT_AUDIENCE,
+        "iat": now,
+        "exp": now
+        + timedelta(seconds=django_settings.APPLICATION_JWT_EXPIRATION_SECONDS),
+        "client_id": str(application.client_id),
+        "scope": scope_string,
+        "user_id": str(user.id),
+        "delegated": True,
+    }
+
+    return jwt.encode(
+        payload,
+        django_settings.APPLICATION_JWT_SECRET_KEY,
+        algorithm=django_settings.APPLICATION_JWT_ALG,
+    )
+
+
+def test_api_users_transit_code_requires_authentication():
+    """Minting a transit code without authentication should return 401."""
+    client = APIClient()
+    response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 401
+
+
+def test_api_users_transit_code_missing_scope():
+    """A token without the 'users:session' scope should be rejected."""
+    user = UserFactory()
+
+    token = generate_test_token(user, [ApplicationScope.ROOMS_RETRIEVE])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 403
+    assert "users:session" in str(response.data)
+
+
+def test_api_users_transit_code_success(settings):
+    """A delegated user with the scope should be able to mint a transit code."""
+    user = UserFactory()
+
+    token = generate_test_token(user, [ApplicationScope.USERS_SESSION])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 200
+    assert response.data["expires_in"] == settings.TRANSIT_CODE_TTL
+
+    code = response.data["transit_code"]
+    # Opaque, high-entropy random string
+    assert len(code) == (4 * settings.TRANSIT_CODE_NBYTES + 2) // 3
+
+    # The code is stored server-side and references the delegated user
+    code_data = TransitCodeService().consume_code(code)
+    assert code_data == {
+        "user_id": str(user.id),
+        "client_id": mock.ANY,
+    }
+
+
+def test_api_users_transit_code_with_rs_token():
+    """A resource-server-authenticated user should be able to mint a code."""
+    user = UserFactory()
+
+    # todo - add a decorator instead
+    with mock.patch.object(
+        ResourceServerAuthentication,
+        "authenticate",
+        return_value=(user, {"scope": "users:session", "client_id": "rs-client"}),
+    ) as mock_rs_authenticate:
+        client = APIClient()
+        client.credentials(HTTP_AUTHORIZATION="Bearer some-opaque-rs-token")
+        response = client.post("/external-api/v1.0/users/transit-code/")
+
+    mock_rs_authenticate.assert_called_once()
+    assert response.status_code == 200
+
+    code_data = TransitCodeService().consume_code(response.data["transit_code"])
+    assert code_data == {
+        "user_id": str(user.id),
+        "client_id": "rs-client",
+    }
+
+
+def test_api_users_transit_code_with_rs_token_missing_scope():
+    """A resource server token without the scope should be rejected."""
+    user = UserFactory()
+
+    # todo - add a decorator instead
+    with mock.patch.object(
+        ResourceServerAuthentication,
+        "authenticate",
+        return_value=(user, {"scope": "rooms:list", "client_id": "rs-client"}),
+    ):
+        client = APIClient()
+        client.credentials(HTTP_AUTHORIZATION="Bearer some-opaque-rs-token")
+        response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 403
+    assert "users:session" in str(response.data)
+
+
+def test_api_users_transit_code_feature_disabled(settings):
+    """Minting a transit code should return 404 when the feature is disabled."""
+    settings.USER_ACCESS_TOKEN_ENABLED = False
+
+    user = UserFactory()
+    token = generate_test_token(user, [ApplicationScope.USERS_SESSION])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 404
+
+
+def test_api_users_transit_code_inactive_user():
+    """An inactive user should not be able to mint a transit code."""
+    user = UserFactory(is_active=False)
+
+    token = generate_test_token(user, [ApplicationScope.USERS_SESSION])
+
+    client = APIClient()
+    client.credentials(HTTP_AUTHORIZATION=f"Bearer {token}")
+    response = client.post("/external-api/v1.0/users/transit-code/")
+
+    assert response.status_code == 401
+
+
+# todo - add a test to make sure the addon authentification doesn't allow to mint a transit token

src/backend/core/urls.py

@@ -30,6 +30,11 @@ router.register(
     addons_viewsets.SessionViewSet,
     basename="addons_sessions",
 )
+router.register(
+    "diagnostics",
+    viewsets.DiagnosticsViewSet,
+    basename="diagnostics",
+)
 
 # - External API
 external_router = SimpleRouter()
@@ -43,6 +48,11 @@ external_router.register(
     external_viewsets.RoomViewSet,
     basename="external_room",
 )
+external_router.register(
+    "users",
+    external_viewsets.UserViewSet,
+    basename="external_user",
+)
 
 urlpatterns = [
     path(

src/backend/core/utils.py

@@ -12,6 +12,7 @@ import mimetypes
 import random
 import secrets
 import string
+from datetime import timedelta
 from functools import lru_cache
 from typing import List, Optional
 from uuid import uuid4
@@ -67,6 +68,7 @@ def generate_token(  # noqa: PLR0917
     sources: Optional[List[str]] = None,
     role: Optional[str] = None,
     participant_id: Optional[str] = None,
+    ttl: Optional[timedelta] = None,
 ) -> str:
     """Generate a LiveKit access token for a user in a specific room.
 
@@ -82,6 +84,7 @@ def generate_token(  # noqa: PLR0917
         role (Optional[str]): Room's access role if any
         participant_id (Optional[str]): Stable identifier for anonymous users;
                          used as identity when user.is_anonymous.
+        ttl (Optional[timedelta]): Token validity duration. Defaults to LiveKit SDK default.
 
     Returns:
         str: The LiveKit JWT access token.
@@ -135,6 +138,8 @@ def generate_token(  # noqa: PLR0917
             }
         )
     )
+    if ttl is not None:
+        token = token.with_ttl(ttl)
 
     return token.to_jwt()
 

src/backend/meet/settings.py

@@ -324,6 +324,7 @@ class Base(Configuration):
 
     REST_FRAMEWORK = {
         "DEFAULT_AUTHENTICATION_CLASSES": (
+            "core.authentication.user_token.UserAccessJWTAuthentication",
             "core.authentication.backends.SessionAuthenticationWith401",
         ),
         "DEFAULT_PARSER_CLASSES": [
@@ -344,6 +345,11 @@ class Base(Configuration):
                 environ_name="REQUEST_ENTRY_THROTTLE_RATES",
                 environ_prefix=None,
             ),
+            "exchange_access_token": values.Value(
+                default="30/minute",
+                environ_name="EXCHANGE_ACCESS_TOKEN_THROTTLE_RATES",
+                environ_prefix=None,
+            ),
             "creation_callback": values.Value(
                 default="600/minute",
                 environ_name="CREATION_CALLBACK_THROTTLE_RATES",
@@ -354,6 +360,11 @@ class Base(Configuration):
                 environ_name="ROOMKIT_JOIN_THROTTLE_RATES",
                 environ_prefix=None,
             ),
+            "connection_test": values.Value(
+                default="30/minute",
+                environ_name="CONNECTION_TEST_THROTTLE_RATES",
+                environ_prefix=None,
+            ),
         },
     }
     MONITORED_THROTTLE_FAILURE_CALLBACK = (
@@ -660,6 +671,30 @@ class Base(Configuration):
         environ_prefix=None,
         default=False,
     )
+    CONNECTION_TEST_ENABLED = values.BooleanValue(
+        environ_name="CONNECTION_TEST_ENABLED",
+        environ_prefix=None,
+        default=False,
+    )
+    CONNECTION_TEST_TOKEN_TTL_SECONDS = values.PositiveIntegerValue(
+        300,
+        environ_name="CONNECTION_TEST_TOKEN_TTL_SECONDS",
+        environ_prefix=None,
+    )
+    # The effective room max age is always computed as
+    # CONNECTION_TEST_TOKEN_TTL_SECONDS + this value. Token expiration does
+    # not automatically delete rooms, so once that age is reached, the
+    # cleanup worker will explicitly delete the room if it still exists.
+    CONNECTION_TEST_ROOM_EXTRA_AGE_SECONDS = values.PositiveIntegerValue(
+        10,
+        environ_name="CONNECTION_TEST_ROOM_EXTRA_AGE_SECONDS",
+        environ_prefix=None,
+    )
+    CONNECTION_TEST_ROOM_PREFIX = values.Value(
+        "connection-test",
+        environ_name="CONNECTION_TEST_ROOM_PREFIX",
+        environ_prefix=None,
+    )
     LIVEKIT_VERIFY_SSL = values.BooleanValue(
         True, environ_name="LIVEKIT_VERIFY_SSL", environ_prefix=None
     )
@@ -846,11 +881,6 @@ class Base(Configuration):
         environ_name="LOBBY_NOTIFICATION_TYPE",
         environ_prefix=None,
     )
-    LOBBY_COOKIE_NAME = values.Value(
-        "lobbyParticipantId",
-        environ_name="LOBBY_COOKIE_NAME",
-        environ_prefix=None,
-    )
 
     # Calendar integrations
     ROOM_CREATION_CALLBACK_CACHE_TIMEOUT = values.PositiveIntegerValue(
@@ -973,6 +1003,61 @@ class Base(Configuration):
         environ_name="APPLICATION_BASE_URL",
         environ_prefix=None,
     )
+
+    # User access tokens (embedded frontend / iframe support)
+    USER_ACCESS_TOKEN_ENABLED = values.BooleanValue(
+        False, environ_name="USER_ACCESS_TOKEN_ENABLED", environ_prefix=None
+    )
+    USER_ACCESS_TOKEN_SECRET_KEY = SecretFileValue(
+        None, environ_name="USER_ACCESS_TOKEN_SECRET_KEY", environ_prefix=None
+    )
+    USER_ACCESS_TOKEN_ALG = values.Value(
+        "HS256",
+        environ_name="USER_ACCESS_TOKEN_ALG",
+        environ_prefix=None,
+    )
+    USER_ACCESS_TOKEN_ISSUER = values.Value(
+        "lasuite-meet",
+        environ_name="USER_ACCESS_TOKEN_ISSUER",
+        environ_prefix=None,
+    )
+    USER_ACCESS_TOKEN_AUDIENCE = values.Value(
+        None,
+        environ_name="USER_ACCESS_TOKEN_AUDIENCE",
+        environ_prefix=None,
+    )
+    # Lifetime of the user access token obtained through the exchange
+    # endpoint. It never transits through a URL, so it can cover a full
+    # meeting (default: 2 hours).
+    USER_ACCESS_TOKEN_TTL = values.PositiveIntegerValue(
+        7200,
+        environ_name="USER_ACCESS_TOKEN_TTL",
+        environ_prefix=None,
+    )
+    # Lifetime of the single-use transit code handed to the frontend
+    # through a URL fragment. Kept very short by design: it must only
+    # survive the redirect and the exchange call.
+    TRANSIT_CODE_TTL = values.PositiveIntegerValue(
+        60,
+        environ_name="TRANSIT_CODE_TTL",
+        environ_prefix=None,
+    )
+    TRANSIT_CODE_CACHE_PREFIX = values.Value(
+        "transit-code",
+        environ_name="TRANSIT_CODE_CACHE_PREFIX",
+        environ_prefix=None,
+    )
+    # Number of random bytes per code (48 bytes -> 64 url-safe characters)
+    TRANSIT_CODE_NBYTES = values.PositiveIntegerValue(
+        48,
+        environ_name="TRANSIT_CODE_NBYTES",
+        environ_prefix=None,
+    )
+    USER_ACCESS_TOKEN_TYPE = values.Value(
+        "Bearer",
+        environ_name="USER_ACCESS_TOKEN_TYPE",
+        environ_prefix=None,
+    )
     # Warning: EXTERNAL_API_ALLOW_PUBLIC_ACCESS is ignored when
     # EXTERNAL_API_DEFAULT_ACCESS_LEVEL=public.
     EXTERNAL_API_ALLOW_PUBLIC_ACCESS = values.BooleanValue(
@@ -1269,6 +1354,12 @@ class Test(Base):
     ADDONS_ENABLED = True
     ADDONS_CSRF_SECRET = "secret-key-padded-for-minimum-len!-addons"  # noqa:S105
     ADDONS_TOKEN_SECRET_KEY = "secret-key-padded-for-minimum-len!-addons"  # noqa:S105
+    USER_ACCESS_TOKEN_ENABLED = True
+    USER_ACCESS_TOKEN_SECRET_KEY = "secret-key-padded-for-minimum-len!-room"  # noqa:S105
+    USER_ACCESS_TOKEN_AUDIENCE = "Test inc."  # noqa:S105
+
+    CONNECTION_TEST_ENABLED = True
+
 
     def __init__(self):
         # pylint: disable=invalid-name

src/backend/pyproject.toml

@@ -7,7 +7,7 @@ build-backend = "uv_build"
 
 [project]
 name = "meet"
-version = "1.24.0"
+version = "1.27.0"
 authors = [{ "name" = "DINUM", "email" = "dev@mail.numerique.gouv.fr" }]
 classifiers = [
     "Development Status :: 5 - Production/Stable",

src/backend/uv.lock

@@ -1187,7 +1187,7 @@ wheels = [
 
 [[package]]
 name = "meet"
-version = "1.24.0"
+version = "1.27.0"
 source = { editable = "." }
 dependencies = [
     { name = "aiohttp" },

src/frontend/Dockerfile

@@ -36,6 +36,9 @@ WORKDIR /home/frontend
 ARG VITE_API_BASE_URL
 ENV VITE_API_BASE_URL=${VITE_API_BASE_URL}
 
+ARG VITE_APP_TITLE
+ENV VITE_APP_TITLE=${VITE_APP_TITLE}
+
 RUN npm run build
 
 # ---- Front-end image ----

src/frontend/default.conf

@@ -4,6 +4,11 @@ server {
   server_tokens off;
 
   root /usr/share/nginx/html;
+  
+  location ^~ /assets/mediapipe/wasm/ {
+      expires 30d;
+      add_header Cache-Control "public, max-age=2592000";
+  }
 
   # Serve static files with caching
   location ~* ^/assets/.*\.(css|js|json|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {

src/frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "meet",
-  "version": "1.24.0",
+  "version": "1.27.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "meet",
-      "version": "1.24.0",
+      "version": "1.27.0",
       "dependencies": {
         "@fontsource-variable/atkinson-hyperlegible-next": "5.2.6",
         "@fontsource-variable/lexend": "5.2.11",
@@ -15,14 +15,13 @@
         "@livekit/components-react": "2.9.21",
         "@livekit/components-styles": "1.2.0",
         "@livekit/track-processors": "0.7.2",
-        "@mediapipe/tasks-vision": "0.10.35",
+        "@mediapipe/tasks-vision": "0.10.14",
         "@pandacss/preset-panda": "1.11.3",
         "@react-types/overlays": "3.10.0",
         "@remixicon/react": "4.9.0",
         "@tanstack/react-query": "5.101.1",
         "@timephy/rnnoise-wasm": "1.0.0",
         "crisp-sdk-web": "1.1.2",
-        "derive-valtio": "0.2.0",
         "hoofd": "1.7.3",
         "humanize-duration": "3.33.2",
         "i18next": "26.3.1",
@@ -1049,18 +1048,12 @@
         "livekit-client": "^1.12.0 || ^2.1.0"
       }
     },
-    "node_modules/@livekit/track-processors/node_modules/@mediapipe/tasks-vision": {
+    "node_modules/@mediapipe/tasks-vision": {
       "version": "0.10.14",
       "resolved": "https://registry.npmjs.org/@mediapipe/tasks-vision/-/tasks-vision-0.10.14.tgz",
       "integrity": "sha512-vOifgZhkndgybdvoRITzRkIueWWSiCKuEUXXK6Q4FaJsFvRJuwgg++vqFUMlL0Uox62U5aEXFhHxlhV7Ja5e3Q==",
       "license": "Apache-2.0"
     },
-    "node_modules/@mediapipe/tasks-vision": {
-      "version": "0.10.35",
-      "resolved": "https://registry.npmjs.org/@mediapipe/tasks-vision/-/tasks-vision-0.10.35.tgz",
-      "integrity": "sha512-HOvadwVRE6JC+45nyYhmnywnr5h/J8KZvOeUNVOG9q/0875pZgItznFB9bRTvLc264YSJqiZ1NsIpCStJw/egg==",
-      "license": "Apache-2.0"
-    },
     "node_modules/@modelcontextprotocol/sdk": {
       "version": "1.29.0",
       "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.29.0.tgz",
@@ -4716,15 +4709,6 @@
         "node": ">= 0.8"
       }
     },
-    "node_modules/derive-valtio": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/derive-valtio/-/derive-valtio-0.2.0.tgz",
-      "integrity": "sha512-6slhaFHtfaL3t5dLYaQt6s4G2xZymhu0Ktdl7OMeVk8+46RgR8ft6FL0Tr4F31W+yPH03nJe1SSP4JFy2hSMRA==",
-      "license": "MIT",
-      "peerDependencies": {
-        "valtio": ">=2.0.0-rc.0"
-      }
-    },
     "node_modules/detect-libc": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",

src/frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "meet",
   "private": true,
-  "version": "1.24.0",
+  "version": "1.27.0",
   "type": "module",
   "scripts": {
     "dev": "panda codegen && vite",
@@ -22,14 +22,13 @@
     "@livekit/components-react": "2.9.21",
     "@livekit/components-styles": "1.2.0",
     "@livekit/track-processors": "0.7.2",
-    "@mediapipe/tasks-vision": "0.10.35",
+    "@mediapipe/tasks-vision": "0.10.14",
     "@pandacss/preset-panda": "1.11.3",
     "@react-types/overlays": "3.10.0",
     "@remixicon/react": "4.9.0",
     "@tanstack/react-query": "5.101.1",
     "@timephy/rnnoise-wasm": "1.0.0",
     "crisp-sdk-web": "1.1.2",
-    "derive-valtio": "0.2.0",
     "hoofd": "1.7.3",
     "humanize-duration": "3.33.2",
     "i18next": "26.3.1",

src/frontend/public/site.webmanifest

@@ -1 +0,0 @@
-{"name":"","short_name":"","icons":[{"src":"/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}

src/frontend/site.webmanifest

@@ -0,0 +1,18 @@
+{
+  "icons": [
+    {
+      "src": "/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "start_url": "/",
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}

src/frontend/src/App.tsx

@@ -12,6 +12,7 @@ import { routes } from './routes'
 import './i18n/init'
 import { queryClient } from '@/api/queryClient'
 import { AppInitialization } from '@/components/AppInitialization'
+import { TransitCodeGate } from '@/features/auth/components/TransitCodeGate'
 import { useIsSdkContext } from '@/features/sdk/hooks/useIsSdkContext'
 import { useApplyA11yFonts } from '@/hooks/useApplyA11yFonts'
 
@@ -24,23 +25,29 @@ function App() {
 
   return (
     <QueryClientProvider client={queryClient}>
-      {!isSDKContext && <AppInitialization />}
-      <Suspense fallback={null}>
-        <I18nProvider locale={i18n.language}>
-          <Layout>
-            <Switch>
-              {Object.entries(routes).map(([, route], i) => (
-                <Route key={i} path={route.path} component={route.Component} />
-              ))}
-              <Route component={NotFoundScreen} />
-            </Switch>
-          </Layout>
-          <ReactQueryDevtools
-            initialIsOpen={false}
-            buttonPosition="bottom-left"
-          />
-        </I18nProvider>
-      </Suspense>
+      <TransitCodeGate>
+        {!isSDKContext && <AppInitialization />}
+        <Suspense fallback={null}>
+          <I18nProvider locale={i18n.language}>
+            <Layout>
+              <Switch>
+                {Object.entries(routes).map(([, route], i) => (
+                  <Route
+                    key={i}
+                    path={route.path}
+                    component={route.Component}
+                  />
+                ))}
+                <Route component={NotFoundScreen} />
+              </Switch>
+            </Layout>
+            <ReactQueryDevtools
+              initialIsOpen={false}
+              buttonPosition="bottom-left"
+            />
+          </I18nProvider>
+        </Suspense>
+      </TransitCodeGate>
     </QueryClientProvider>
   )
 }

src/frontend/src/api/fetchApi.ts

@@ -1,17 +1,23 @@
 import { ApiError } from './ApiError'
 import { apiUrl } from './apiUrl'
+import { getAccessToken } from '@/stores/accessToken'
 
 export const fetchApi = async <T = Record<string, unknown>>(
   url: string,
   options?: RequestInit
 ): Promise<T> => {
   const csrfToken = getCsrfToken()
+  // Embedded (iframe) mode: the user access token obtained through the
+  // transit code exchange authenticates requests in place of the session
+  // cookie, which is blocked in third-party contexts.
+  const accessToken = getAccessToken()
   const response = await fetch(apiUrl(url), {
     credentials: 'include',
     ...options,
     headers: {
       'Content-Type': 'application/json',
       ...(!!csrfToken && { 'X-CSRFToken': csrfToken }),
+      ...(!!accessToken && { Authorization: `Bearer ${accessToken}` }),
       ...options?.headers,
     },
   })

src/frontend/src/api/useConfig.ts

@@ -45,6 +45,9 @@ export interface ApiConfig {
   subtitle: {
     enabled: boolean
   }
+  diagnostics: {
+    connection_test_enabled?: boolean
+  }
   telephony: {
     enabled: boolean
     international_phone_number?: string

src/frontend/src/components/Avatar.tsx

@@ -1,5 +1,5 @@
 import { css, cva, RecipeVariantProps } from '@/styled-system/css'
-import React from 'react'
+import React, { useLayoutEffect, useMemo } from 'react'
 
 const avatar = cva({
   base: {
@@ -28,13 +28,34 @@ const avatar = cva({
   },
 })
 
+// Instantiating a segmenter is expensive; create it once and reuse it.
+const graphemeSegmenter =
+  typeof Intl !== 'undefined' && 'Segmenter' in Intl
+    ? new Intl.Segmenter(undefined, { granularity: 'grapheme' })
+    : undefined
+
+/**
+ * Returns the first user-perceived character. Some Unicode characters span
+ * multiple UTF-16 code units, so a naive index into the string can split them
+ * and yield a broken glyph.
+ */
+const getFirstGrapheme = (value: string): string => {
+  if (!value) return ''
+  if (graphemeSegmenter) {
+    const [first] = graphemeSegmenter.segment(value)
+    return first?.segment ?? ''
+  }
+  // Fallback: keeps single code points intact (including surrogate pairs).
+  return Array.from(value)[0] ?? ''
+}
+
 const getInitials = (name?: string): string => {
   if (!name) return ''
   const words = name.trim().split(/\s+/).filter(Boolean)
   if (words.length === 0) return ''
-  const first = words[0].charAt(0)
-  const second = words.length > 1 ? words[1].charAt(0) : ''
-  return (first + second).toUpperCase()
+  const first = getFirstGrapheme(words[0])
+  const second = words.length > 1 ? getFirstGrapheme(words[1]) : ''
+  return (first + second).toLocaleUpperCase()
 }
 
 export type AvatarProps = React.HTMLAttributes<HTMLDivElement> & {
@@ -44,7 +65,37 @@ export type AvatarProps = React.HTMLAttributes<HTMLDivElement> & {
 
 export const Avatar = React.memo(
   ({ name, bgColor, context, notification, style, ...props }: AvatarProps) => {
-    const initials = getInitials(name)
+    const initials = useMemo(() => getInitials(name), [name])
+    const textRef = React.useRef<SVGTextElement>(null)
+    const [offsetY, setOffsetY] = React.useState(0)
+
+    // Optically center the initials: measure the ink bounding box of the
+    // rendered glyphs and shift them so the box's center sits at the middle
+    // of the viewBox. Works for any font, weight or glyph shape, unlike a
+    // hand-tuned dy offset. getBBox() is in local (pre-transform)
+    // coordinates, so applying the translation never changes the measure.
+    useLayoutEffect(() => {
+      const text = textRef.current
+      if (!text) return
+
+      const center = () => {
+        const box = text.getBBox()
+        // A hidden element measures as an empty box; keep the default then.
+        if (box.height === 0) return
+        setOffsetY(50 - (box.y + box.height / 2))
+      }
+
+      center()
+      // Glyph metrics can change once webfonts finish loading.
+      let cancelled = false
+      document.fonts?.ready.then(() => {
+        if (!cancelled) center()
+      })
+      return () => {
+        cancelled = true
+      }
+    }, [initials])
+
     return (
       <div
         style={{ backgroundColor: bgColor, ...style }}
@@ -57,16 +108,17 @@ export const Avatar = React.memo(
           className={css({ width: '100%', height: '100%', display: 'block' })}
         >
           <text
+            ref={textRef}
             x="50"
             y="50"
-            dy="-0.08em"
+            transform={`translate(0 ${offsetY})`}
             textAnchor="middle"
             dominantBaseline="central"
             fontSize="52"
             fontWeight="500"
             fill="currentColor"
           >
-            {initials.toUpperCase()}
+            {initials}
           </text>
         </svg>
       </div>

src/frontend/src/components/SoundTester.tsx

@@ -2,24 +2,31 @@ import { Button } from '@/primitives'
 import { useEffect, useRef, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import { useMediaDeviceSelect } from '@livekit/components-react'
+import { reportError } from '@/features/analytics/telemetry'
+import { canTestAudioOutput } from '@/features/rooms/utils/canTestAudioOutput'
 
 export const SoundTester = () => {
   const { t } = useTranslation('settings')
   const [isPlaying, setIsPlaying] = useState(false)
   const audioRef = useRef<HTMLAudioElement>(null)
 
-  const { activeDeviceId } = useMediaDeviceSelect({ kind: 'audiooutput' })
+  const { devices, activeDeviceId } = useMediaDeviceSelect({
+    kind: 'audiooutput',
+  })
 
   useEffect(() => {
-    const updateActiveId = async (deviceId: string) => {
-      try {
-        await audioRef?.current?.setSinkId(deviceId)
-      } catch (error) {
-        console.error(`Error setting sinkId: ${error}`)
+    if (!canTestAudioOutput() || !activeDeviceId) return
+    if (!devices.some((device) => device.deviceId === activeDeviceId)) return
+    audioRef.current?.setSinkId(activeDeviceId).catch((error) => {
+      if (error instanceof DOMException && error.name === 'NotFoundError') {
+        return
       }
-    }
-    updateActiveId(activeDeviceId)
-  }, [activeDeviceId])
+      reportError(
+        'device_switch_failure',
+        new Error(`Error setting sinkId: ${error}`)
+      )
+    })
+  }, [devices, activeDeviceId])
 
   // prevent pausing the sound
   navigator.mediaSession.setActionHandler('pause', function () {})
@@ -28,9 +35,13 @@ export const SoundTester = () => {
     <>
       <Button
         variant="secondaryText"
-        onPress={() => {
-          audioRef?.current?.play()
-          setIsPlaying(true)
+        onPress={async () => {
+          try {
+            await audioRef?.current?.play()
+            setIsPlaying(true)
+          } catch {
+            setIsPlaying(false)
+          }
         }}
         size="sm"
         isDisabled={isPlaying}
@@ -44,7 +55,7 @@ export const SoundTester = () => {
       {/* eslint-disable jsx-a11y/media-has-caption */}
       <audio
         ref={audioRef}
-        src="sounds/uprise.mp3"
+        src="/sounds/uprise.mp3"
         onEnded={() => setIsPlaying(false)}
       />
     </>

src/frontend/src/features/analytics/exceptionFilters.ts

@@ -0,0 +1,24 @@
+import type { CaptureResult } from 'posthog-js'
+
+const IGNORED_EXCEPTION_PATTERNS = [
+  /ResizeObserver loop (completed with undelivered notifications|limit exceeded)/,
+]
+
+const shouldIgnoreException = (value: unknown): boolean =>
+  typeof value === 'string' &&
+  IGNORED_EXCEPTION_PATTERNS.some((pattern) => pattern.test(value))
+
+export const filterExceptions = (
+  event: CaptureResult | null
+): CaptureResult | null => {
+  if (event?.event !== '$exception') return event
+
+  const exceptionList = event.properties?.['$exception_list']
+  const values: unknown[] = Array.isArray(exceptionList)
+    ? exceptionList.map((exception) => exception?.value)
+    : []
+
+  values.push(event.properties?.['$exception_message'])
+
+  return values.some(shouldIgnoreException) ? null : event
+}

src/frontend/src/features/analytics/hooks/useAnalytics.ts

@@ -1,15 +1,8 @@
 import { useEffect } from 'react'
-import { useLocation } from 'wouter'
-import { type PostHog } from 'posthog-js'
 import { type ApiUser } from '@/features/auth/api/ApiUser'
 import { useUser } from '@/features/auth/api/useUser'
-
-let posthog: PostHog | null = null
-
-const getPosthog = async () => {
-  if (!posthog) posthog = (await import('posthog-js')).default
-  return posthog
-}
+import { getPosthog } from '../utils'
+import { filterExceptions } from '../exceptionFilters'
 
 export const startAnalyticsSession = (data: ApiUser) => {
   getPosthog().then((ph) => {
@@ -38,7 +31,6 @@ export const useAnalytics = ({
   flags_api_host,
   isDisabled,
 }: useAnalyticsProps) => {
-  const [location] = useLocation()
   const { user } = useUser()
 
   useEffect(() => {
@@ -49,6 +41,14 @@ export const useAnalytics = ({
         api_host: host,
         flags_api_host: flags_api_host,
         person_profiles: 'always',
+        capture_pageview: 'history_change',
+        capture_pageleave: true,
+        capture_exceptions: {
+          capture_unhandled_errors: true,
+          capture_unhandled_rejections: true,
+          capture_console_errors: true,
+        },
+        before_send: filterExceptions,
       })
     })
   }, [id, host, flags_api_host, isDisabled])
@@ -58,12 +58,5 @@ export const useAnalytics = ({
     startAnalyticsSession(user)
   }, [user])
 
-  // From PostHog tutorial on PageView tracking in a Single Page Application (SPA) context.
-  useEffect(() => {
-    getPosthog().then((ph) => {
-      ph.capture('$pageview')
-    })
-  }, [location])
-
   return null
 }

src/frontend/src/features/analytics/telemetry.ts

@@ -0,0 +1,150 @@
+import { getPosthog } from './utils'
+
+export const captureEvent = (
+  event: string,
+  props?: Record<string, unknown>
+) => {
+  void getPosthog()
+    .then((ph) => {
+      ph.capture(event, props)
+    })
+    .catch(() => {
+      /* telemetry must never break the app */
+    })
+  if (import.meta.env.DEV) {
+    console.warn(`[telemetry] ${event}`, props)
+  }
+}
+
+export type LogCode =
+  // media
+  | 'join_preview_failure'
+  | 'room_media_failure'
+  | 'livekit_room_error'
+  | 'device_switch_failure'
+  | 'permission_poll_failure'
+  | 'media_devices_error_event'
+  // non-media families
+  | 'participant_mute_api_failure'
+  | 'permissions_api_failure'
+  | 'effects_processor_failure'
+  | 'clipboard_failure'
+  | 'fullscreen_failure'
+  | 'publish_sources_failure'
+  | 'disconnect_failure'
+  | 'generic_failure'
+
+export const reportError = (
+  logCode: LogCode,
+  error: unknown,
+  extraInfo: Record<string, unknown> = {}
+): void => {
+  const e = error instanceof Error ? error : new Error(String(error))
+  void getPosthog()
+    .then((ph) => {
+      ph.captureException(e, {
+        log_code: logCode,
+        error_name: e.name,
+        error_message: e.message,
+        ...extraInfo,
+      })
+    })
+    .catch(() => {})
+  if (import.meta.env.DEV) {
+    console.warn(`[${logCode}]`, e, extraInfo)
+  }
+}
+
+export interface DeviceSnapshot {
+  cam_count: number
+  mic_count: number
+  out_count: number
+  labels_visible: boolean
+  saved_cam_present: boolean | null
+  saved_mic_present: boolean | null
+  saved_video_device_id_set: boolean
+  saved_audio_device_id_set: boolean
+  audio_enabled: boolean | null
+  video_enabled: boolean | null
+  cam_permission: PermissionState | 'unknown'
+  mic_permission: PermissionState | 'unknown'
+}
+
+/** Reads the persisted LiveKit user choices without importing the store. */
+const readPersistedChoices = (): {
+  videoDeviceId?: string
+  audioDeviceId?: string
+  videoEnabled?: boolean
+  audioEnabled?: boolean
+} => {
+  try {
+    return JSON.parse(localStorage.getItem('lk-user-choices') ?? '{}')
+  } catch {
+    return {}
+  }
+}
+
+const queryPermission = async (
+  name: 'camera' | 'microphone'
+): Promise<PermissionState | 'unknown'> => {
+  try {
+    const status = await navigator.permissions.query({
+      name: name as PermissionName,
+    })
+    return status.state
+  } catch {
+    return 'unknown'
+  }
+}
+
+export const deviceSnapshot = async (): Promise<DeviceSnapshot> => {
+  const choices = readPersistedChoices()
+  let devices: MediaDeviceInfo[] = []
+  try {
+    devices = await navigator.mediaDevices.enumerateDevices()
+  } catch {
+    /* snapshot stays partial */
+  }
+  const ofKind = (k: MediaDeviceKind) => devices.filter((d) => d.kind === k)
+  const present = (k: MediaDeviceKind, id?: string) =>
+    id ? ofKind(k).some((d) => d.deviceId === id) : null
+
+  const [cam_permission, mic_permission] = await Promise.all([
+    queryPermission('camera'),
+    queryPermission('microphone'),
+  ])
+
+  return {
+    cam_count: ofKind('videoinput').length,
+    mic_count: ofKind('audioinput').length,
+    out_count: ofKind('audiooutput').length,
+    labels_visible: devices.some((d) => !!d.label),
+    saved_cam_present: present('videoinput', choices.videoDeviceId),
+    saved_mic_present: present('audioinput', choices.audioDeviceId),
+    saved_video_device_id_set: !!choices.videoDeviceId,
+    saved_audio_device_id_set: !!choices.audioDeviceId,
+    audio_enabled: choices.audioEnabled ?? null,
+    video_enabled: choices.videoEnabled ?? null,
+    cam_permission,
+    mic_permission,
+  }
+}
+
+export const captureMediaEvent = async (
+  event:
+    | 'media-device-error'
+    | 'media-acquisition'
+    | 'media-device-topology'
+    | 'media-device-success'
+    | 'device-not-found'
+    | 'permissions-denied'
+    | 'screen-share-permission-denied'
+    | 'silent-mic-detected'
+    | 'silent-mic-analyser-unavailable'
+    | 'silent-mic-recovered'
+    | 'visit-room'
+    | 'connection-event',
+  props: Record<string, unknown>
+) => {
+  captureEvent(event, { ...props, ...(await deviceSnapshot()) })
+}

src/frontend/src/features/analytics/utils.ts

@@ -0,0 +1,8 @@
+import type { PostHog } from 'posthog-js'
+
+let posthog: PostHog | null = null
+
+export const getPosthog = async () => {
+  if (!posthog) posthog = (await import('posthog-js')).default
+  return posthog
+}

src/frontend/src/features/auth/api/exchangeAccessToken.ts

@@ -0,0 +1,64 @@
+import { fetchApi } from '@/api/fetchApi'
+import { setAccessToken } from '@/stores/accessToken'
+import { consumeTransitCodeFromFragment } from '../utils/transitCode'
+
+type ApiAccessToken = {
+  access_token: string
+  token_type: string
+  expires_in: number
+  scope: string
+}
+
+/**
+ * Exchange a single-use transit code for a user access token.
+ *
+ * The endpoint is unauthenticated: the code itself is the credential.
+ */
+export const exchangeAccessToken = (code: string): Promise<ApiAccessToken> => {
+  return fetchApi<ApiAccessToken>('/users/exchange-access-token/', {
+    method: 'POST',
+    body: JSON.stringify({ code }),
+  })
+}
+
+const runInitialization = async (): Promise<void> => {
+  const code = consumeTransitCodeFromFragment()
+
+  if (!code) {
+    return
+  }
+
+  try {
+    const { access_token } = await exchangeAccessToken(code)
+    setAccessToken(access_token)
+  } catch (error) {
+    console.warn('Transit code exchange failed:', error)
+  }
+}
+
+let initialization: Promise<void> | null = null
+
+/**
+ * Bootstrap the embedded (iframe) authentication, if applicable.
+ *
+ * When, and only when, a transit code is present in the URL fragment,
+ * exchange it for a user access token and keep it in the in-memory
+ * accessToken store: fetchApi then sends it as a Bearer header on every
+ * api call, authenticating the user exactly like a session cookie would.
+ *
+ * Must complete before anything fires an authenticated query, which the
+ * TransitCodeGate component guarantees by gating the app tree on it.
+ *
+ * Memoized: the fragment is consumed and the code exchanged exactly once,
+ * however many times this is called (StrictMode double-invoked effects,
+ * among others). Subsequent calls await the same promise.
+ *
+ * A failed exchange (expired or already used code) is not fatal: the app
+ * starts unauthenticated, falling back to the regular session flow.
+ */
+export const initializeAccessTokenFromFragment = (): Promise<void> => {
+  if (!initialization) {
+    initialization = runInitialization()
+  }
+  return initialization
+}

src/frontend/src/features/auth/api/fetchUser.ts

@@ -2,6 +2,7 @@ import { ApiError } from '@/api/ApiError'
 import { fetchApi } from '@/api/fetchApi'
 import { type ApiUser } from './ApiUser'
 import { attemptSilentLogin, canAttemptSilentLogin } from '../utils/silentLogin'
+import { getAccessToken } from '@/stores/accessToken'
 
 /**
  * fetch the logged-in user from the api.
@@ -25,7 +26,13 @@ export const fetchUser = (
         if (error instanceof ApiError && error.statusCode === 401) {
           // make sure to not resolve the promise while trying to silent login
           // so that consumers of fetchUser don't think the work already ended
-          if (opts.attemptSilent && canAttemptSilentLogin()) {
+          // Never attempt a silent login in embedded (token) mode: an OIDC
+          // redirect inside the iframe would break the embed.
+          if (
+            opts.attemptSilent &&
+            !getAccessToken() &&
+            canAttemptSilentLogin()
+          ) {
             attemptSilentLogin(30)
           } else {
             resolve(false)

src/frontend/src/features/auth/api/useSyncUserPreferencesWithBackend.tsx

@@ -6,6 +6,8 @@ import { queryClient } from '@/api/queryClient'
 import { updateUserPreferences } from './updateUserPreferences'
 import { convertToBackendLanguage } from '@/utils/languages'
 import { useUser } from './useUser'
+import { ApiError } from '@/api/ApiError.ts'
+import { reportError } from '@/features/analytics/telemetry'
 
 /**
  * Hook that synchronizes user browser preferences (language, timezone) with backend user settings.
@@ -42,6 +44,11 @@ export const useSyncUserPreferencesWithBackend = () => {
       }
     }
 
-    syncBrowserPreferencesToBackend()
+    syncBrowserPreferencesToBackend().catch((error) => {
+      if (error instanceof ApiError && error.statusCode === 401) return
+      reportError('generic_failure', error, {
+        context: '[useSyncUserPreferencesWithBackend] Failed to sync:',
+      })
+    })
   }, [i18n.language, isLoggedIn, user, mutateAsync])
 }

src/frontend/src/features/auth/components/TransitCodeGate.tsx

@@ -0,0 +1,67 @@
+import { useEffect, useState } from 'react'
+import { LoadingScreen } from '@/components/LoadingScreen'
+import { useHash } from '@/hooks/useHash'
+import { initializeAccessTokenFromFragment } from '../api/exchangeAccessToken'
+import { hasTransitCodeInFragment } from '../utils/transitCode'
+
+/**
+ * Gates the app tree on the embedded (iframe) authentication bootstrap.
+ *
+ * Without a transit code in the URL fragment — the overwhelmingly common
+ * case — the component early returns children synchronously: no state,
+ * no effect, no extra render, no loading screen.
+ *
+ * When a transit code is present, children are not mounted until it has
+ * been exchanged for a user access token, so that every authenticated
+ * query already carries the Authorization header. A loading screen is
+ * displayed in the meantime, as UserAware does.
+ */
+export const TransitCodeGate = ({
+  children,
+}: {
+  children: React.ReactNode
+}) => {
+  const hash = useHash()
+
+  // Latch the decision on the initial hash: the bootstrap scrubs the
+  // fragment as soon as it starts, and the gate must not flip back to the
+  // fast path while the exchange is still in flight.
+  const [needsExchange] = useState(() => hasTransitCodeInFragment(hash))
+
+  if (!needsExchange) {
+    return children
+  }
+
+  return <TransitCodeExchange>{children}</TransitCodeExchange>
+}
+
+/**
+ * Only ever mounted when a transit code is present: runs the memoized
+ * bootstrap (safe against StrictMode double-invoked effects) and holds
+ * children back until it settles.
+ */
+const TransitCodeExchange = ({ children }: { children: React.ReactNode }) => {
+  const [isReady, setIsReady] = useState(false)
+
+  useEffect(() => {
+    let isMounted = true
+    initializeAccessTokenFromFragment().finally(() => {
+      console.log('$$ transit code exchange finished')
+      if (isMounted) {
+        console.log('$$ setIsReady')
+        setIsReady(true)
+      }
+    })
+    return () => {
+      isMounted = false
+    }
+  }, [])
+
+  console.log('$$ isReady', isReady)
+
+  return isReady ? (
+    children
+  ) : (
+    <LoadingScreen header={false} footer={false} delay={1000} />
+  )
+}

src/frontend/src/features/auth/utils/transitCode.ts

@@ -0,0 +1,46 @@
+const TRANSIT_CODE_FRAGMENT_PARAM = 'transit_code'
+
+/**
+ * Whether a URL fragment carries a transit code. Pure check, does not
+ * consume anything.
+ */
+export const hasTransitCodeInFragment = (hash: string): boolean => {
+  if (!hash) {
+    return false
+  }
+  return new URLSearchParams(hash.replace(/^#/, '')).has(
+    TRANSIT_CODE_FRAGMENT_PARAM
+  )
+}
+
+/**
+ * Extract the transit code from the URL fragment, if any.
+ *
+ * The fragment is scrubbed from the address bar immediately, before any
+ * network call, so the code never lingers in the browser history. Any
+ * other fragment content is preserved.
+ */
+export const consumeTransitCodeFromFragment = (): string | null => {
+  if (typeof window === 'undefined' || !window.location.hash) {
+    return null
+  }
+
+  const params = new URLSearchParams(window.location.hash.substring(1))
+  const code = params.get(TRANSIT_CODE_FRAGMENT_PARAM)
+
+  if (!code) {
+    return null
+  }
+
+  params.delete(TRANSIT_CODE_FRAGMENT_PARAM)
+  const remaining = params.toString()
+  window.history.replaceState(
+    null,
+    '',
+    window.location.pathname +
+      window.location.search +
+      (remaining ? `#${remaining}` : '')
+  )
+
+  return code
+}

src/frontend/src/features/chat/components/ChatMessageBody.tsx

@@ -1,6 +1,6 @@
 import { ChatRow } from '@/stores/chat'
 import React, { useMemo } from 'react'
-import { formatChatMessageLinks } from '@livekit/components-react'
+import { formatChatMessageLinks } from '../utils'
 import { css } from '@/styled-system/css'
 import { Text } from '@/primitives'
 

src/frontend/src/features/chat/utils.tsx

@@ -0,0 +1,32 @@
+import { tokenize, createDefaultGrammar } from '@livekit/components-core'
+import { ReactNode } from 'react'
+
+const defaultGrammar = Object.freeze(createDefaultGrammar())
+
+export function formatChatMessageLinks(message: string): ReactNode {
+  const trimmedMessage = message.replace(/^[\r\n]+|[\r\n]+$/g, '')
+  return tokenize(trimmedMessage, defaultGrammar).map((tok, i) => {
+    if (typeof tok === `string`) {
+      return tok
+    } else {
+      const content = tok.content.toString()
+      const href =
+        tok.type === `url`
+          ? /^http(s?):\/\//.test(content)
+            ? content
+            : `https://${content}`
+          : `mailto:${content}`
+      return (
+        <a
+          className="lk-chat-link"
+          key={i}
+          href={href}
+          target="_blank"
+          rel="noreferrer"
+        >
+          {content}
+        </a>
+      )
+    }
+  })
+}

src/frontend/src/features/diagnostics/api/fetchConnectionTestDetails.ts

@@ -0,0 +1,17 @@
+import { fetchApi } from '@/api/fetchApi'
+
+export type LiveKitConnectionDetails = {
+  url: string
+  room: string
+  token: string
+  expires_in: number
+}
+
+export type ConnectionTestResponse = {
+  livekit: LiveKitConnectionDetails
+}
+
+export const fetchConnectionTestDetails = () =>
+  fetchApi<ConnectionTestResponse>('/diagnostics/connection/', {
+    method: 'POST',
+  })

src/frontend/src/features/diagnostics/checks/selectedCandidate.ts

@@ -0,0 +1,257 @@
+import { Checker, Track, type CheckInfo } from 'livekit-client'
+
+/**
+ * Addresses are useful to a network administrator (they identify the egress IP
+ * and the SFU endpoint actually reached) but they also land in a downloadable
+ * report. Flip this to false to keep only the candidate types and protocols.
+ */
+const INCLUDE_CANDIDATE_ADDRESSES = true
+
+/** Beyond this, the log becomes noise rather than evidence. */
+const MAX_LOGGED_PAIRS = 8
+
+export type IceCandidateInfo = {
+  /** host, srflx, prflx or relay. */
+  type?: string
+  /** Transport to the first hop: udp or tcp. */
+  protocol?: string
+  /** Transport used by the relay itself (udp, tcp, tls). Local relay only. */
+  relayProtocol?: string
+  /** Chrome reports an mDNS `.local` name here for host candidates. */
+  address?: string
+  port?: number
+  /** Local candidates only, and not reported by every browser. */
+  networkType?: string
+}
+
+export type IceCandidatePair = {
+  /** The pair the browser is actually sending media on. */
+  selected: boolean
+  nominated?: boolean
+  local: IceCandidateInfo
+  remote: IceCandidateInfo
+  /** Round trip time in milliseconds. */
+  rttMs?: number
+  availableOutgoingBitrate?: number
+  bytesSent?: number
+}
+
+export type IceCandidateReport = {
+  selected: IceCandidatePair | null
+  /** Every pair that completed its connectivity checks, selected one first. */
+  working: IceCandidatePair[]
+}
+
+const PROBE_WIDTH = 320
+const PROBE_HEIGHT = 180
+const PROBE_FPS = 15
+const SETTLE_DELAY_MS = 3000
+
+type Stats = Record<string, unknown> & { type?: string }
+
+const readCandidate = (stats?: Stats): IceCandidateInfo => {
+  if (!stats) return {}
+
+  return {
+    type: stats.candidateType as string | undefined,
+    protocol: stats.protocol as string | undefined,
+    relayProtocol: stats.relayProtocol as string | undefined,
+    networkType: stats.networkType as string | undefined,
+    ...(INCLUDE_CANDIDATE_ADDRESSES
+      ? {
+          address: stats.address as string | undefined,
+          port: stats.port as number | undefined,
+        }
+      : {}),
+  }
+}
+
+const describeCandidate = (candidate: IceCandidateInfo) => {
+  const transport = candidate.relayProtocol ?? candidate.protocol ?? 'unknown'
+  const endpoint =
+    candidate.address === undefined
+      ? ''
+      : ` ${candidate.address}:${candidate.port ?? '?'}`
+  return `${candidate.type ?? 'unknown'} ${transport}${endpoint}`
+}
+
+const parseCandidates = (report: RTCStatsReport): IceCandidateReport => {
+  let selectedId: string | undefined
+
+  report.forEach((stats: Stats) => {
+    if (stats.type === 'transport' && stats.selectedCandidatePairId) {
+      selectedId = stats.selectedCandidatePairId as string
+    }
+  })
+
+  const working: IceCandidatePair[] = []
+
+  report.forEach((stats: Stats) => {
+    // `succeeded` means the pair completed its connectivity checks; failed,
+    // waiting and in-progress pairs are not evidence of anything working.
+    if (stats.type !== 'candidate-pair' || stats.state !== 'succeeded') return
+
+    const rtt = stats.currentRoundTripTime as number | undefined
+
+    working.push({
+      selected: selectedId !== undefined && stats.id === selectedId,
+      nominated: stats.nominated as boolean | undefined,
+      local: readCandidate(report.get(stats.localCandidateId as string)),
+      remote: readCandidate(report.get(stats.remoteCandidateId as string)),
+      rttMs: rtt === undefined ? undefined : Math.round(rtt * 1000),
+      availableOutgoingBitrate: stats.availableOutgoingBitrate as
+        | number
+        | undefined,
+      bytesSent: stats.bytesSent as number | undefined,
+    })
+  })
+
+  // Firefox does not report transport.selectedCandidatePairId: fall back to the
+  // nominated pair, then to the one that actually carried bytes.
+  let selected = working.find((pair) => pair.selected) ?? null
+  if (!selected) {
+    selected =
+      working.find((pair) => pair.nominated) ??
+      working
+        .slice()
+        .sort((a, b) => (b.bytesSent ?? 0) - (a.bytesSent ?? 0))[0] ??
+      null
+    if (selected) selected.selected = true
+  }
+
+  working.sort((a, b) => Number(b.selected) - Number(a.selected))
+
+  return { selected, working }
+}
+
+/**
+ * A synthetic track avoids asking for camera or microphone permission: this
+ * check must work for someone who denied both.
+ */
+const createProbeTrack = () => {
+  const canvas = document.createElement('canvas')
+  canvas.width = PROBE_WIDTH
+  canvas.height = PROBE_HEIGHT
+
+  const context = canvas.getContext('2d')
+  if (!context) throw new Error('Could not get canvas context')
+
+  let frame = 0
+  let rafId = 0
+  const draw = () => {
+    frame = (frame + 4) % 360
+    context.fillStyle = `hsl(${frame}, 100%, 50%)`
+    context.fillRect(0, 0, canvas.width, canvas.height)
+    rafId = requestAnimationFrame(draw)
+  }
+  draw()
+
+  const track = canvas.captureStream(PROBE_FPS).getVideoTracks()[0]
+
+  return {
+    track,
+    stop: () => {
+      cancelAnimationFrame(rafId)
+      track.stop()
+    },
+  }
+}
+
+export class SelectedCandidateCheck extends Checker {
+  private result: IceCandidateReport | null = null
+
+  get description() {
+    const selected = this.result?.selected
+    if (!selected) return 'Selected ICE candidate pair'
+
+    const transport =
+      selected.local.relayProtocol ?? selected.local.protocol ?? 'unknown'
+    const rtt =
+      selected.rttMs === undefined ? '' : ` · RTT ${selected.rttMs} ms`
+    return `${selected.local.type ?? 'unknown'} over ${transport}${rtt}`
+  }
+
+  protected async perform() {
+    await this.connect()
+
+    const probe = createProbeTrack()
+    try {
+      let publication
+      try {
+        publication = await this.room.localParticipant.publishTrack(
+          probe.track,
+          {
+            // The token restricts `can_publish_sources`, so a raw
+            // MediaStreamTrack published as `unknown` is rejected server side.
+            source: Track.Source.Camera,
+            simulcast: false,
+            videoEncoding: { maxBitrate: 300_000, maxFramerate: PROBE_FPS },
+          }
+        )
+      } catch (error) {
+        // A server-side grant problem is not a diagnosis of the user's network.
+        this.appendWarning(
+          `Could not publish the probe track: ${
+            error instanceof Error ? error.message : 'unknown error'
+          }`
+        )
+        this.skip()
+        return
+      }
+
+      // ICE keeps promoting pairs for a moment after the track goes up.
+      await new Promise((resolve) => setTimeout(resolve, SETTLE_DELAY_MS))
+
+      // Stats come from the publisher peer connection: in an empty test room
+      // there is no subscriber transport to inspect.
+      const report = await publication.track?.getRTCStatsReport()
+      this.result = report ? parseCandidates(report) : null
+    } finally {
+      probe.stop()
+    }
+
+    const selected = this.result?.selected
+    const working = this.result?.working ?? []
+
+    if (!selected) {
+      this.appendWarning('No working candidate pair reported by the browser')
+      return
+    }
+
+    this.appendMessage(`selected: ${describeCandidate(selected.local)}`)
+    this.appendMessage(`server: ${describeCandidate(selected.remote)}`)
+    if (selected.rttMs !== undefined) {
+      this.appendMessage(`round trip time: ${selected.rttMs} ms`)
+    }
+
+    this.appendMessage(`working candidate pairs: ${working.length}`)
+    for (const pair of working.slice(0, MAX_LOGGED_PAIRS)) {
+      const rtt = pair.rttMs === undefined ? '' : ` · ${pair.rttMs} ms`
+      this.appendMessage(
+        `${pair.selected ? '→' : ' '} ${describeCandidate(pair.local)} → ${describeCandidate(pair.remote)}${rtt}`
+      )
+    }
+    if (working.length > MAX_LOGGED_PAIRS) {
+      this.appendMessage(
+        `… and ${working.length - MAX_LOGGED_PAIRS} more, see the report`
+      )
+    }
+
+    if (selected.local.type === 'relay') {
+      this.appendWarning(
+        'Media is relayed through TURN. Direct connections are likely blocked by a firewall.'
+      )
+    }
+    if ((selected.local.relayProtocol ?? selected.local.protocol) !== 'udp') {
+      this.appendWarning(
+        'Media is not using UDP, which usually means degraded quality under load.'
+      )
+    }
+  }
+
+  getInfo(): CheckInfo {
+    const info = super.getInfo()
+    info.data = this.result ?? undefined
+    return info
+  }
+}

src/frontend/src/features/diagnostics/components/ConnectionTestStepRow.tsx

@@ -0,0 +1,186 @@
+import { useTranslation } from 'react-i18next'
+import {
+  Disclosure,
+  DisclosurePanel,
+  Heading,
+  Button as RACButton,
+} from 'react-aria-components'
+import { RiArrowDownSFill } from '@remixicon/react'
+import { css, cx } from '@/styled-system/css'
+import type { ConnectionTestStepResult } from '../types'
+import { StepStatusIndicator } from './StepStatusIndicator'
+
+/** Each step is its own bounded card, collapsed or not. */
+const cardClass = css({
+  border: '1px solid {colors.greyscale.900}',
+  borderRadius: '5px',
+  backgroundColor: 'white',
+  overflow: 'hidden',
+})
+
+/**
+ * Fixed columns so the status labels line up across every row, whether or not
+ * the row is expandable.
+ */
+const rowClass = css({
+  display: 'grid',
+  gridTemplateColumns: 'minmax(0, 1fr) 7rem 1.5rem',
+  alignItems: 'center',
+  gap: '1rem',
+  width: '100%',
+  paddingX: '1rem',
+  paddingY: '0.75rem',
+  textAlign: 'left',
+})
+
+const identityClass = css({
+  display: 'flex',
+  flexDirection: 'column',
+  gap: '0.125rem',
+  minWidth: 0,
+})
+
+const triggerClass = css({
+  cursor: 'pointer',
+  transition: 'background-color 120ms',
+  _hover: { backgroundColor: 'greyscale.50' },
+  '&[data-focus-visible]': {
+    outline: '2px solid {colors.focusRing}',
+    outlineOffset: '-2px',
+  },
+})
+
+/** Expanded headers stay tinted so the open card reads as one block. */
+const triggerExpandedClass = css({
+  backgroundColor: 'greyscale.100',
+  _hover: { backgroundColor: 'greyscale.100' },
+})
+
+const labelClass = css({
+  textStyle: 'body',
+  color: 'greyscale.1000',
+  fontWeight: 'medium',
+})
+
+const valueClass = css({
+  fontFamily: 'mono',
+  textStyle: 'xs',
+  color: 'greyscale.500',
+  overflowWrap: 'anywhere',
+})
+
+const chevronClass = css({
+  color: 'primary.800',
+  justifySelf: 'end',
+  transition: 'transform 150ms',
+})
+
+const chevronExpandedClass = css({ transform: 'rotate(180deg)' })
+
+const headingResetClass = css({
+  margin: 0,
+  fontSize: 'inherit',
+  fontWeight: 'inherit',
+})
+
+const panelClass = css({
+  backgroundColor: 'white',
+})
+
+const logListClass = css({
+  listStyle: 'none',
+  margin: 0,
+  padding: 0,
+  display: 'flex',
+  flexDirection: 'column',
+  gap: '0.25rem',
+})
+
+const logItemClass = css({
+  fontFamily: 'mono',
+  textStyle: 'xs',
+  color: 'greyscale.700',
+  overflowWrap: 'anywhere',
+})
+
+const StepRowContent = ({ step }: { step: ConnectionTestStepResult }) => {
+  const { t } = useTranslation('connectionTest')
+
+  return (
+    <>
+      <span className={identityClass}>
+        <span className={labelClass}>{t(`steps.${step.id}`)}</span>
+        {step.summary && <span className={valueClass}>{step.summary}</span>}
+      </span>
+      <StepStatusIndicator
+        status={step.status}
+        label={t(`status.${step.status}`)}
+      />
+    </>
+  )
+}
+
+export const ConnectionTestStepRow = ({
+  step,
+}: {
+  step: ConnectionTestStepResult
+}) => {
+  const { t } = useTranslation('connectionTest')
+  const isSettled = step.status !== 'pending' && step.status !== 'running'
+  const hasLogs = isSettled && Boolean(step.logs?.length)
+
+  if (!hasLogs) {
+    return (
+      <div className={cx(cardClass, rowClass)}>
+        <StepRowContent step={step} />
+        {/* Empty chevron column keeps non-expandable rows aligned. */}
+        <span />
+      </div>
+    )
+  }
+
+  return (
+    <Disclosure className={cardClass}>
+      {({ isExpanded }) => (
+        <>
+          <Heading level={3} className={headingResetClass}>
+            <RACButton
+              slot="trigger"
+              className={cx(
+                rowClass,
+                triggerClass,
+                isExpanded ? triggerExpandedClass : undefined
+              )}
+            >
+              <StepRowContent step={step} />
+              <RiArrowDownSFill
+                aria-hidden="true"
+                className={cx(
+                  chevronClass,
+                  isExpanded ? chevronExpandedClass : undefined
+                )}
+              />
+            </RACButton>
+          </Heading>
+          <DisclosurePanel
+            className={panelClass}
+            aria-label={t('detailsFor', { step: t(`steps.${step.id}`) })}
+            style={{ padding: isExpanded ? '0.75rem 1rem' : '0  1rem' }}
+          >
+            {/* Collapsed panels stay in the DOM for aria-controls, but the log
+                lines themselves are only mounted when actually visible. */}
+            {isExpanded && (
+              <ul className={logListClass}>
+                {step.logs?.map((log, index) => (
+                  <li key={`${log.level}-${index}`} className={logItemClass}>
+                    {log.message}
+                  </li>
+                ))}
+              </ul>
+            )}
+          </DisclosurePanel>
+        </>
+      )}
+    </Disclosure>
+  )
+}

src/frontend/src/features/diagnostics/components/ConnectionTestSummary.tsx

@@ -0,0 +1,257 @@
+import type { ReactNode } from 'react'
+import { useTranslation } from 'react-i18next'
+import { ProgressBar } from 'react-aria-components'
+import { css, cx } from '@/styled-system/css'
+import type { ConnectionTestStats } from '../types'
+import { statusSquareClass } from './stepAppearance'
+
+type SummaryState = 'idle' | 'running' | 'passed' | 'partial' | 'failed'
+
+/** Only a failure earns a colour: everything else stays near-black. */
+const stateColorClass: Record<SummaryState, string> = {
+  idle: css({ color: 'greyscale.1000' }),
+  running: css({ color: 'greyscale.1000' }),
+  passed: css({ color: 'greyscale.1000' }),
+  partial: css({ color: 'greyscale.1000' }),
+  failed: css({ color: 'danger.600' }),
+}
+
+const cardClass = css({
+  width: '100%',
+  borderRadius: '5px',
+  border: '1px solid {colors.greyscale.900}',
+  backgroundColor: 'white',
+  padding: { base: '1.25rem', xsm: '1.75rem' },
+  display: 'flex',
+  flexDirection: 'column',
+  // Blocks are spaced here; everything inside a block stays tight.
+  gap: '1.5rem',
+})
+
+const headerClass = css({
+  display: 'flex',
+  flexDirection: 'column',
+  gap: '0.5rem',
+})
+
+const eyebrowClass = css({
+  textStyle: 'sm',
+  fontWeight: 'medium',
+  color: 'greyscale.600',
+  margin: 0,
+})
+
+const headlineClass = css({
+  // Sized for the longest state string ("N vérifications en échec"), not for
+  // the shortest one.
+  fontSize: { base: '28', xsm: '40' },
+  lineHeight: '1.1',
+  fontWeight: 'bold',
+  letterSpacing: '-0.02em',
+  textWrap: 'balance',
+  margin: 0,
+})
+
+const hintClass = css({
+  textStyle: 'sm',
+  color: 'greyscale.600',
+  margin: 0,
+  maxWidth: '34rem',
+})
+
+const dividerClass = css({
+  // Lighter than the card border: an inner rule should never compete with it.
+  borderTop: '1px solid {colors.greyscale.100}',
+  paddingTop: '1.25rem',
+  display: 'flex',
+  flexDirection: 'column',
+  gap: '0.875rem',
+})
+
+const progressRowClass = css({
+  display: 'flex',
+  alignItems: 'center',
+  gap: '0.75rem',
+})
+
+const trackClass = css({
+  height: '0.375rem',
+  width: '100%',
+  borderRadius: 'full',
+  backgroundColor: 'greyscale.200',
+  overflow: 'hidden',
+})
+
+const fillClass = css({
+  height: '100%',
+  borderRadius: 'full',
+  backgroundColor: 'primary.800',
+  transition: 'width 200ms ease-out',
+})
+
+const progressValueClass = css({
+  textStyle: 'sm',
+  fontVariantNumeric: 'tabular-nums',
+  color: 'greyscale.700',
+  whiteSpace: 'nowrap',
+  // Reserved width so the bar does not resize when the digits change.
+  minWidth: '3rem',
+  textAlign: 'right',
+})
+
+const countersClass = css({
+  display: 'flex',
+  flexWrap: 'wrap',
+  gap: '0.5rem 1.5rem',
+})
+
+const counterClass = css({
+  display: 'inline-flex',
+  alignItems: 'center',
+  gap: '0.5rem',
+  textStyle: 'sm',
+  color: 'greyscale.600',
+})
+
+const counterSquareClass = css({
+  width: '0.5rem',
+  height: '0.5rem',
+  borderRadius: '2px',
+  flexShrink: 0,
+})
+
+const counterValueClass = css({
+  fontWeight: 'medium',
+  fontVariantNumeric: 'tabular-nums',
+  color: 'greyscale.1000',
+})
+
+/** A zero count is context, not a result: it recedes instead of shouting. */
+const emptyCounterClass = css({ color: 'greyscale.400' })
+const emptySquareClass = css({
+  backgroundColor: 'transparent!',
+  border: '1px solid {colors.greyscale.250}',
+})
+
+const actionsClass = css({
+  display: 'flex',
+  flexWrap: 'wrap',
+  gap: '0.75rem',
+})
+
+const Counter = ({
+  squareClass,
+  value,
+  label,
+}: {
+  squareClass: string
+  value: number
+  label: string
+}) => {
+  const isEmpty = value === 0
+
+  return (
+    <span className={cx(counterClass, isEmpty ? emptyCounterClass : undefined)}>
+      <span
+        aria-hidden="true"
+        className={cx(
+          counterSquareClass,
+          squareClass,
+          isEmpty ? emptySquareClass : undefined
+        )}
+      />
+      <span
+        className={cx(
+          counterValueClass,
+          isEmpty ? emptyCounterClass : undefined
+        )}
+      >
+        {value}
+      </span>
+      {label}
+    </span>
+  )
+}
+
+export const ConnectionTestSummary = ({
+  stats,
+  isRunning,
+  children,
+}: {
+  stats: ConnectionTestStats
+  isRunning: boolean
+  children?: ReactNode
+}) => {
+  const { t } = useTranslation('connectionTest')
+
+  const state: SummaryState = isRunning
+    ? 'running'
+    : !stats.hasStarted
+      ? 'idle'
+      : stats.failed > 0
+        ? 'failed'
+        : stats.skipped > 0
+          ? 'partial'
+          : 'passed'
+
+  return (
+    <section className={cardClass}>
+      <div className={headerClass}>
+        <h1 className={eyebrowClass}>{t('title')}</h1>
+
+        {/* Announced once per state change rather than on every step update. */}
+        <p className={cx(headlineClass, stateColorClass[state])} role="status">
+          {state === 'failed'
+            ? t('summary.failed', { count: stats.failed })
+            : t(`summary.${state}`)}
+        </p>
+
+        <p className={hintClass}>{t(`summary.${state}Hint`)}</p>
+      </div>
+
+      {stats.hasStarted && (
+        <div className={dividerClass}>
+          <div className={progressRowClass}>
+            <ProgressBar
+              aria-label={t('progressLabel')}
+              value={stats.progress}
+              className={css({ flex: 1 })}
+            >
+              {({ percentage }) => (
+                <div className={trackClass}>
+                  <div
+                    className={fillClass}
+                    style={{ width: `${percentage ?? 0}%` }}
+                  />
+                </div>
+              )}
+            </ProgressBar>
+            <span className={progressValueClass}>
+              {t('progress', { done: stats.settled, total: stats.total })}
+            </span>
+          </div>
+
+          <div className={countersClass}>
+            <Counter
+              squareClass={statusSquareClass.success}
+              value={stats.passed}
+              label={t('counts.passed')}
+            />
+            <Counter
+              squareClass={statusSquareClass.skipped}
+              value={stats.skipped}
+              label={t('counts.skipped')}
+            />
+            <Counter
+              squareClass={statusSquareClass.failed}
+              value={stats.failed}
+              label={t('counts.failed')}
+            />
+          </div>
+        </div>
+      )}
+
+      {children && <div className={actionsClass}>{children}</div>}
+    </section>
+  )
+}

src/frontend/src/features/diagnostics/components/StepStatusIndicator.tsx

@@ -0,0 +1,40 @@
+import { css, cx } from '@/styled-system/css'
+import type { ConnectionTestStepStatus } from '../types'
+import { statusSquareClass, statusTextClass } from './stepAppearance'
+
+const wrapperClass = css({
+  display: 'inline-flex',
+  alignItems: 'center',
+  gap: '0.5rem',
+  textStyle: 'sm',
+  whiteSpace: 'nowrap',
+})
+
+const squareClass = css({
+  width: '0.625rem',
+  height: '0.625rem',
+  borderRadius: '2px',
+  flexShrink: 0,
+})
+
+/**
+ * Status is carried by the label; the square is decorative so the meaning does
+ * not depend on colour alone.
+ */
+export const StepStatusIndicator = ({
+  status,
+  label,
+  className,
+}: {
+  status: ConnectionTestStepStatus
+  label: string
+  className?: string
+}) => (
+  <span className={cx(wrapperClass, className)}>
+    <span
+      aria-hidden="true"
+      className={cx(squareClass, statusSquareClass[status])}
+    />
+    <span className={statusTextClass[status]}>{label}</span>
+  </span>
+)

src/frontend/src/features/diagnostics/components/stepAppearance.ts

@@ -0,0 +1,29 @@
+import { css } from '@/styled-system/css'
+import type { ConnectionTestStepStatus } from '../types'
+
+/**
+ * Panda extracts styles statically, so every status needs its own literal
+ * `css()` call: `css({ backgroundColor: someVariable })` would emit nothing.
+ */
+export const statusSquareClass: Record<ConnectionTestStepStatus, string> = {
+  pending: css({
+    backgroundColor: 'transparent',
+    border: '1px solid {colors.greyscale.300}',
+  }),
+  running: css({
+    backgroundColor: 'primary.800',
+    animation: 'pulse_background 1.2s ease-in-out infinite',
+  }),
+  success: css({ backgroundColor: 'success.600' }),
+  failed: css({ backgroundColor: 'danger.600' }),
+  skipped: css({ backgroundColor: 'greyscale.300' }),
+}
+
+/** Colour is carried by the square; the label stays near-black except on failure. */
+export const statusTextClass: Record<ConnectionTestStepStatus, string> = {
+  pending: css({ color: 'greyscale.500' }),
+  running: css({ color: 'greyscale.700' }),
+  success: css({ color: 'greyscale.1000' }),
+  failed: css({ color: 'danger.600', fontWeight: 'medium' }),
+  skipped: css({ color: 'greyscale.500' }),
+}

src/frontend/src/features/diagnostics/hooks/useConnectionTestRunner.ts

@@ -0,0 +1,298 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+import {
+  CheckStatus,
+  ConnectionCheck,
+  createLocalAudioTrack,
+  createLocalVideoTrack,
+  getBrowser,
+  type CheckInfo,
+} from 'livekit-client'
+import { fetchConnectionTestDetails } from '../api/fetchConnectionTestDetails'
+import { SelectedCandidateCheck } from '../checks/selectedCandidate'
+import {
+  createInitialSteps,
+  type ConnectionTestLog,
+  type ConnectionTestStepId,
+  type ConnectionTestStepResult,
+  type ConnectionTestStepStatus,
+} from '../types'
+import { openPermissionsDialog } from '@/stores/permissions'
+
+const LIVEKIT_STEP_IDS: ConnectionTestStepId[] = [
+  'websocket',
+  'webrtc',
+  'turn',
+  'reconnect',
+  'selectedCandidate',
+  'publishAudio',
+  'publishVideo',
+]
+
+const CHECK_STATUS_TO_STEP: Record<CheckStatus, ConnectionTestStepStatus> = {
+  [CheckStatus.IDLE]: 'pending',
+  [CheckStatus.RUNNING]: 'running',
+  [CheckStatus.SUCCESS]: 'success',
+  [CheckStatus.FAILED]: 'failed',
+  [CheckStatus.SKIPPED]: 'skipped',
+}
+
+/** getUserMedia rejections that mean "the user said no", not "the device is broken". */
+const PERMISSION_ERROR_NAMES = new Set([
+  'NotAllowedError',
+  'PermissionDeniedError',
+  'SecurityError',
+])
+
+const getErrorMessage = (error: unknown, fallback = 'Unknown error') =>
+  error instanceof Error ? error.message : fallback
+
+const isPermissionError = (error: unknown) =>
+  error instanceof Error && PERMISSION_ERROR_NAMES.has(error.name)
+
+const fromCheckInfo = (info: CheckInfo): Partial<ConnectionTestStepResult> => ({
+  status: CHECK_STATUS_TO_STEP[info.status] ?? 'failed',
+  summary: info.description,
+  logs: info.logs,
+})
+
+const groupDevicesByKind = (devices: MediaDeviceInfo[]) => {
+  const grouped: Record<string, string[]> = {
+    audioinput: [],
+    audiooutput: [],
+    videoinput: [],
+  }
+  for (const device of devices) {
+    // Browsers are free to report kinds we don't know about yet.
+    const bucket = (grouped[device.kind] ??= [])
+    bucket.push(device.label || device.deviceId)
+  }
+  return grouped
+}
+
+/**
+ * Outcome of a single step. `aborted` is deliberately distinct from `failed`:
+ * a cancelled run must not be reported to the user as a broken device.
+ */
+type StepOutcome =
+  | { state: 'success' }
+  | { state: 'failed'; error: unknown }
+  | { state: 'aborted' }
+
+const ABORTED: StepOutcome = { state: 'aborted' }
+
+export const useConnectionTestRunner = () => {
+  const [steps, setSteps] = useState(createInitialSteps)
+  const [isRunning, setIsRunning] = useState(false)
+  const abortRef = useRef<AbortController | null>(null)
+
+  const updateStep = useCallback(
+    (id: ConnectionTestStepId, patch: Partial<ConnectionTestStepResult>) => {
+      setSteps((current) =>
+        current.map((step) => (step.id === id ? { ...step, ...patch } : step))
+      )
+    },
+    []
+  )
+
+  const skipSteps = useCallback(
+    (
+      ids: ConnectionTestStepId[],
+      summary: string,
+      logs?: ConnectionTestLog[]
+    ) => {
+      // One state update for the whole batch instead of one per step.
+      const targets = new Set(ids)
+      setSteps((current) =>
+        current.map((step) =>
+          targets.has(step.id)
+            ? { ...step, status: 'skipped', summary, logs }
+            : step
+        )
+      )
+    },
+    []
+  )
+
+  const runStep = useCallback(
+    async (
+      id: ConnectionTestStepId,
+      signal: AbortSignal,
+      fn: () => Promise<Partial<ConnectionTestStepResult>>
+    ): Promise<StepOutcome> => {
+      if (signal.aborted) return ABORTED
+
+      updateStep(id, {
+        status: 'running',
+        summary: undefined,
+        logs: undefined,
+        data: undefined,
+      })
+
+      try {
+        const result = await fn()
+        if (signal.aborted) return ABORTED
+        // `result.status` overrides when set (LiveKit checks map their own status)
+        updateStep(id, { status: 'success', ...result })
+        return { state: 'success' }
+      } catch (error) {
+        if (signal.aborted) return ABORTED
+        updateStep(id, {
+          status: 'failed',
+          summary: getErrorMessage(error),
+        })
+        return { state: 'failed', error }
+      }
+    },
+    [updateStep]
+  )
+
+  const runTest = useCallback(async () => {
+    abortRef.current?.abort()
+    const controller = new AbortController()
+    abortRef.current = controller
+    const { signal } = controller
+
+    setIsRunning(true)
+    setSteps(createInitialSteps())
+
+    try {
+      await runStep('browser', signal, async () => {
+        const browser = getBrowser()
+        if (!browser) throw new Error('Browser not detected')
+        return {
+          summary: `${browser.name} ${browser.version}`,
+          data: {
+            name: browser.name,
+            version: browser.version,
+            os: browser.os,
+            osVersion: browser.osVersion,
+          },
+        }
+      })
+      if (signal.aborted) return
+
+      const microphone = await runStep('microphone', signal, async () => {
+        const track = await createLocalAudioTrack()
+        const label =
+          track.mediaStreamTrack.label ||
+          track.mediaStreamTrack.getSettings().deviceId ||
+          ''
+        track.stop()
+        return { summary: label, data: { label } }
+      })
+      if (signal.aborted) return
+      if (
+        microphone.state === 'failed' &&
+        isPermissionError(microphone.error)
+      ) {
+        openPermissionsDialog('audioinput')
+      }
+
+      const camera = await runStep('camera', signal, async () => {
+        const track = await createLocalVideoTrack()
+        const settings = track.mediaStreamTrack.getSettings()
+        const label = track.mediaStreamTrack.label || ''
+        // Released immediately, like the microphone probe: the capture
+        // indicator must not stay on between this check and publishVideo.
+        track.stop()
+        return {
+          summary: label,
+          data: {
+            label,
+            width: settings.width,
+            height: settings.height,
+          },
+        }
+      })
+      if (signal.aborted) return
+      if (camera.state === 'failed' && isPermissionError(camera.error)) {
+        openPermissionsDialog('videoinput')
+      }
+
+      await runStep('devices', signal, async () => {
+        const devices = await navigator.mediaDevices.enumerateDevices()
+        return {
+          summary: String(devices.length),
+          data: groupDevicesByKind(devices),
+        }
+      })
+      if (signal.aborted) return
+
+      let checker: ConnectionCheck
+      try {
+        const { livekit } = await fetchConnectionTestDetails()
+        if (signal.aborted) return
+        checker = new ConnectionCheck(livekit.url, livekit.token)
+      } catch (error) {
+        if (signal.aborted) return
+        skipSteps(
+          LIVEKIT_STEP_IDS,
+          getErrorMessage(error, 'Failed to fetch test token')
+        )
+        return
+      }
+
+      // LiveKit's ConnectionCheck exposes no cancellation: each check owns its
+      // own room and disconnects it when it settles. The best we can do is
+      // never start the next one once the run has been aborted (runStep
+      // short-circuits on `signal.aborted`).
+      await runStep('websocket', signal, async () =>
+        fromCheckInfo(await checker.checkWebsocket())
+      )
+      await runStep('webrtc', signal, async () =>
+        fromCheckInfo(await checker.checkWebRTC())
+      )
+      await runStep('turn', signal, async () =>
+        fromCheckInfo(await checker.checkTURN())
+      )
+      await runStep('reconnect', signal, async () =>
+        fromCheckInfo(await checker.checkReconnect())
+      )
+      await runStep('selectedCandidate', signal, async () =>
+        fromCheckInfo(await checker.createAndRunCheck(SelectedCandidateCheck))
+      )
+
+      if (microphone.state !== 'success') {
+        skipSteps(['publishAudio'], 'Microphone permission required')
+      } else {
+        await runStep('publishAudio', signal, async () =>
+          fromCheckInfo(await checker.checkPublishAudio())
+        )
+      }
+
+      if (camera.state !== 'success') {
+        skipSteps(['publishVideo'], 'Camera permission required')
+      } else {
+        await runStep('publishVideo', signal, async () =>
+          fromCheckInfo(await checker.checkPublishVideo())
+        )
+      }
+    } finally {
+      if (!signal.aborted) {
+        setIsRunning(false)
+      }
+    }
+  }, [runStep, skipSteps])
+
+  const reset = useCallback(() => {
+    abortRef.current?.abort()
+    setSteps(createInitialSteps())
+    setIsRunning(false)
+  }, [])
+
+  // Leaving the page mid-run must stop the pending checks rather than let them
+  // keep a LiveKit session open behind an unmounted component.
+  useEffect(
+    () => () => {
+      abortRef.current?.abort()
+    },
+    []
+  )
+
+  return {
+    steps,
+    isRunning,
+    runTest,
+    reset,
+  }
+}

src/frontend/src/features/diagnostics/routes/ConnectionTest.tsx

@@ -0,0 +1,167 @@
+import { useEffect, useMemo } from 'react'
+import { useTranslation } from 'react-i18next'
+import {
+  RiCloseLine,
+  RiDownload2Line,
+  RiErrorWarningLine,
+  RiPlayLine,
+} from '@remixicon/react'
+import { CenteredContent } from '@/layout/CenteredContent'
+import { Screen } from '@/layout/Screen'
+import { Button } from '@/primitives'
+import { css } from '@/styled-system/css'
+import { Center, VStack } from '@/styled-system/jsx'
+import { Permissions } from '@/features/rooms/components/Permissions'
+import { useConnectionTestRunner } from '../hooks/useConnectionTestRunner'
+import { ConnectionTestStepRow } from '../components/ConnectionTestStepRow'
+import { ConnectionTestSummary } from '../components/ConnectionTestSummary'
+import { CONNECTION_TEST_GROUPS, summarizeSteps } from '../types'
+import { downloadConnectionTestReport } from '../utils/downloadConnectionTestReport'
+import { useConfig } from '@/api/useConfig'
+import { navigateTo } from '@/navigation/navigateTo'
+
+const HIDE_LIVEKIT_VIDEO_CLASS = 'connection-test-hide-livekit-video'
+
+const sectionClass = css({
+  width: '100%',
+  borderTop: '2px solid {colors.greyscale.900}',
+  paddingTop: '1rem',
+})
+
+const sectionTitleClass = css({
+  textStyle: 'h2',
+  color: 'greyscale.1000',
+  margin: 0,
+})
+
+const rowsClass = css({
+  display: 'flex',
+  flexDirection: 'column',
+  gap: '0.5rem',
+  marginTop: '0.75rem',
+})
+
+const helpClass = css({
+  display: 'flex',
+  alignItems: 'flex-start',
+  gap: '0.5rem',
+  width: '100%',
+  borderRadius: 8,
+  border: '1px solid {colors.greyscale.200}',
+  backgroundColor: 'white',
+  padding: '0.75rem 1rem',
+  textStyle: 'sm',
+  color: 'greyscale.800',
+})
+
+const helpIconClass = css({
+  color: 'danger.600',
+  flexShrink: 0,
+  marginTop: '2px',
+})
+
+const ConnectionTest = () => {
+  const { data, isLoading } = useConfig()
+  const { t } = useTranslation('connectionTest')
+  const { steps, isRunning, runTest, reset } = useConnectionTestRunner()
+
+  const stats = useMemo(() => summarizeSteps(steps), [steps])
+  const stepsById = useMemo(
+    () => new Map(steps.map((step) => [step.id, step] as const)),
+    [steps]
+  )
+  const isPublishVideoRunning =
+    stepsById.get('publishVideo')?.status === 'running'
+
+  // LiveKit appends a bare <video> to document.body during publishVideo.
+  // Keep it in the DOM (so the frame check still works) but hide it visually.
+  useEffect(() => {
+    document.body.classList.toggle(
+      HIDE_LIVEKIT_VIDEO_CLASS,
+      isPublishVideoRunning
+    )
+    return () => {
+      document.body.classList.remove(HIDE_LIVEKIT_VIDEO_CLASS)
+    }
+  }, [isPublishVideoRunning])
+
+  useEffect(() => {
+    // Wait for config to load, otherwise we'd redirect off a page
+    // that's actually enabled.
+    if (!isLoading && !data?.diagnostics?.connection_test_enabled) {
+      navigateTo('home', undefined, { replace: true })
+    }
+  }, [isLoading, data])
+
+  return (
+    <Screen layout="centered">
+      <Permissions />
+      <CenteredContent withBackButton>
+        <Center>
+          <VStack gap="1.5rem" maxWidth="40rem" width="100%">
+            <ConnectionTestSummary stats={stats} isRunning={isRunning}>
+              {isRunning ? (
+                // A disabled "run" button while the test runs is dead weight:
+                // cancelling is the only thing left to do.
+                <Button
+                  variant="secondary"
+                  onPress={reset}
+                  icon={<RiCloseLine size={18} aria-hidden="true" />}
+                >
+                  {t('cancel')}
+                </Button>
+              ) : (
+                <Button
+                  variant="primary"
+                  onPress={runTest}
+                  icon={<RiPlayLine size={18} aria-hidden="true" />}
+                >
+                  {stats.hasStarted ? t('runAgain') : t('runTest')}
+                </Button>
+              )}
+              {stats.hasStarted && !isRunning && (
+                <Button
+                  variant="secondary"
+                  onPress={() => downloadConnectionTestReport(steps)}
+                  icon={<RiDownload2Line size={18} aria-hidden="true" />}
+                >
+                  {t('downloadReport')}
+                </Button>
+              )}
+            </ConnectionTestSummary>
+
+            {stats.hasStarted &&
+              CONNECTION_TEST_GROUPS.map((group) => (
+                <section key={group.id} className={sectionClass}>
+                  <h2 className={sectionTitleClass}>
+                    {t(`groups.${group.id}`)}
+                  </h2>
+                  <div className={rowsClass}>
+                    {group.steps.map((id) => {
+                      const step = stepsById.get(id)
+                      return step ? (
+                        <ConnectionTestStepRow key={id} step={step} />
+                      ) : null
+                    })}
+                  </div>
+                </section>
+              ))}
+
+            {stats.failed > 0 && !isRunning && (
+              <p className={helpClass}>
+                <RiErrorWarningLine
+                  size={18}
+                  aria-hidden="true"
+                  className={helpIconClass}
+                />
+                {t('help.firewall')}
+              </p>
+            )}
+          </VStack>
+        </Center>
+      </CenteredContent>
+    </Screen>
+  )
+}
+
+export default ConnectionTest

src/frontend/src/features/diagnostics/types.ts

@@ -0,0 +1,103 @@
+export type ConnectionTestStepId =
+  | 'browser'
+  | 'microphone'
+  | 'camera'
+  | 'devices'
+  | 'websocket'
+  | 'webrtc'
+  | 'turn'
+  | 'reconnect'
+  | 'selectedCandidate'
+  | 'publishAudio'
+  | 'publishVideo'
+
+export type ConnectionTestStepStatus =
+  | 'pending'
+  | 'running'
+  | 'success'
+  | 'failed'
+  | 'skipped'
+
+export type ConnectionTestLog = {
+  level: 'info' | 'warning' | 'error'
+  message: string
+}
+
+export type ConnectionTestStepResult = {
+  id: ConnectionTestStepId
+  status: ConnectionTestStepStatus
+  summary?: string
+  logs?: ConnectionTestLog[]
+  data?: Record<string, unknown>
+}
+
+export type ConnectionTestGroupId = 'local' | 'network'
+
+/** Display order: everything local first, then everything that leaves the machine. */
+export const CONNECTION_TEST_GROUPS: ReadonlyArray<{
+  id: ConnectionTestGroupId
+  steps: ReadonlyArray<ConnectionTestStepId>
+}> = [
+  { id: 'local', steps: ['browser', 'microphone', 'camera', 'devices'] },
+  {
+    id: 'network',
+    steps: [
+      'websocket',
+      'webrtc',
+      'turn',
+      'reconnect',
+      'selectedCandidate',
+      'publishAudio',
+      'publishVideo',
+    ],
+  },
+]
+
+export const CONNECTION_TEST_STEP_IDS: ConnectionTestStepId[] =
+  CONNECTION_TEST_GROUPS.flatMap((group) => [...group.steps])
+
+export const createInitialSteps = (): ConnectionTestStepResult[] =>
+  CONNECTION_TEST_STEP_IDS.map((id) => ({ id, status: 'pending' }))
+
+export type ConnectionTestStats = {
+  total: number
+  settled: number
+  passed: number
+  failed: number
+  skipped: number
+  hasStarted: boolean
+  progress: number
+}
+
+/**
+ * Single pass over the steps: the page needs half a dozen derived booleans and
+ * counters, and scanning the array once per render beats one `.some()` per flag.
+ */
+export const summarizeSteps = (
+  steps: ConnectionTestStepResult[]
+): ConnectionTestStats => {
+  let passed = 0
+  let failed = 0
+  let skipped = 0
+  let pending = 0
+
+  for (const step of steps) {
+    if (step.status === 'success') passed += 1
+    else if (step.status === 'failed') failed += 1
+    else if (step.status === 'skipped') skipped += 1
+    else if (step.status === 'pending') pending += 1
+  }
+
+  const total = steps.length
+  const settled = passed + failed + skipped
+
+  return {
+    total,
+    settled,
+    passed,
+    failed,
+    skipped,
+    hasStarted: pending < total,
+    progress: total === 0 ? 0 : Math.round((settled / total) * 100),
+  }
+}

src/frontend/src/features/diagnostics/utils/downloadConnectionTestReport.ts

@@ -0,0 +1,53 @@
+import type { ConnectionTestStepResult } from '../types'
+
+export type ConnectionTestReport = {
+  generatedAt: string
+  userAgent: string
+  steps: Record<
+    string,
+    {
+      status: ConnectionTestStepResult['status']
+      summary?: string
+      logs?: ConnectionTestStepResult['logs']
+      data?: ConnectionTestStepResult['data']
+    }
+  >
+}
+
+export const buildConnectionTestReport = (
+  steps: ConnectionTestStepResult[]
+): ConnectionTestReport => ({
+  generatedAt: new Date().toISOString(),
+  userAgent: navigator.userAgent,
+  steps: Object.fromEntries(
+    steps.map(({ id, status, summary, logs, data }) => [
+      id,
+      {
+        status,
+        ...(summary !== undefined ? { summary } : {}),
+        ...(logs?.length ? { logs } : {}),
+        ...(data !== undefined ? { data } : {}),
+      },
+    ])
+  ),
+})
+
+export const downloadConnectionTestReport = (
+  steps: ConnectionTestStepResult[]
+) => {
+  const report = buildConnectionTestReport(steps)
+  const timestamp = report.generatedAt.slice(0, 19).replace(/:/g, '-')
+  const blob = new Blob([JSON.stringify(report, null, 2)], {
+    type: 'application/json',
+  })
+  const url = URL.createObjectURL(blob)
+  const anchor = document.createElement('a')
+  anchor.href = url
+  anchor.download = `connection-test-${timestamp}.json`
+  // Firefox only follows the click when the anchor is in the document, and
+  // revoking the URL in the same tick cancels the download in some browsers.
+  document.body.appendChild(anchor)
+  anchor.click()
+  anchor.remove()
+  setTimeout(() => URL.revokeObjectURL(url), 0)
+}

src/frontend/src/features/files/hooks/useResolvedMediaUrls.ts

@@ -0,0 +1,56 @@
+import { useCallback, useEffect, useState } from 'react'
+import { useSnapshot } from 'valtio'
+import { accessTokenStore } from '@/stores/accessToken'
+import { resolveMediaUrl } from '../utils/resolveMediaUrl'
+
+/**
+ * Reactive companion of resolveMediaUrl for browser-native consumers
+ * (CSS url(), img src attributes): resolves a list of /media/ URLs and
+ * returns a stable lookup, identity in regular mode.
+ *
+ * Object URLs come from the shared session-lifetime cache and are never
+ * revoked here: they may be used concurrently by the background
+ * processors.
+ */
+export const useResolvedMediaUrls = (
+  urls: (string | null | undefined)[]
+): ((url: string) => string) => {
+  const [resolved, setResolved] = useState<Record<string, string>>({})
+  const { accessToken } = useSnapshot(accessTokenStore)
+
+  // Stable dependency for the effect, insensitive to array identity
+  const urlsKey = urls.filter(Boolean).sort().join('\n')
+
+  useEffect(() => {
+    if (!accessToken || !urlsKey) {
+      return
+    }
+
+    let isMounted = true
+
+    const resolveAll = async () => {
+      const entries = await Promise.all(
+        urlsKey.split('\n').map(async (url) => {
+          try {
+            return [url, await resolveMediaUrl(url)] as const
+          } catch (error) {
+            console.warn(error)
+            return [url, url] as const
+          }
+        })
+      )
+      if (isMounted) {
+        setResolved(Object.fromEntries(entries))
+      }
+    }
+    resolveAll()
+
+    return () => {
+      isMounted = false
+    }
+  }, [accessToken, urlsKey])
+
+  // Stable identity so that consumers can safely list the resolver in
+  // their memo dependencies: it only changes when resolutions land.
+  return useCallback((url: string) => resolved[url] ?? url, [resolved])
+}

src/frontend/src/features/files/utils/resolveMediaUrl.ts

@@ -0,0 +1,47 @@
+import { getAccessToken } from '@/stores/accessToken'
+
+// Session-lifetime cache: object URLs are shared between every consumer
+// of a given media (background processors, thumbnails) and are therefore
+// never revoked - their number is bounded by the user's custom
+// backgrounds, and they die with the page like the access token does.
+const objectUrlCache = new Map<string, string>()
+
+/**
+ * Resolve an authenticated /media/ URL for the embedded (token) mode.
+ *
+ * Media files are served behind an nginx auth_request subrequest that
+ * authenticates the original request. In regular mode the session cookie
+ * rides along browser-native loads (img.src, CSS url()) and the URL is
+ * returned unchanged, without any fetch. In embedded mode the
+ * third-party cookie is blocked and native loads cannot carry the
+ * Authorization header, so the media is fetched here with the Bearer
+ * header - which the media-auth endpoint accepts, as it sits behind the
+ * default authentication stack - and exposed as a blob object URL.
+ */
+export const resolveMediaUrl = async (url: string): Promise<string> => {
+  const accessToken = getAccessToken()
+
+  if (!accessToken) {
+    return url
+  }
+
+  const cached = objectUrlCache.get(url)
+  if (cached) {
+    return cached
+  }
+
+  const response = await fetch(url, {
+    headers: { Authorization: `Bearer ${accessToken}` },
+  })
+
+  if (!response.ok) {
+    throw new Error(
+      `Failed to resolve media url ${url}: HTTP ${response.status}`
+    )
+  }
+
+  const objectUrl = URL.createObjectURL(await response.blob())
+  objectUrlCache.set(url, objectUrl)
+
+  return objectUrl
+}

src/frontend/src/features/home/routes/Home.tsx

@@ -15,6 +15,7 @@ import { css } from '@/styled-system/css'
 import { useConfig } from '@/api/useConfig'
 import { LoginButton } from '@/components/LoginButton'
 import { LoadingScreen } from '@/components/LoadingScreen'
+import { captureEvent } from '@/features/analytics/telemetry'
 
 const Columns = ({ children }: { children?: ReactNode }) => {
   return (
@@ -160,7 +161,11 @@ const Home = () => {
           window.location.replace(data.external_home_url)
         } catch (error) {
           setRedirectFailed(true)
-          console.error('Site is not reachable:', error)
+          captureEvent('external-home-unreachable', {
+            error_name: error instanceof Error ? error.name : 'Unknown',
+            error_message:
+              error instanceof Error ? error.message : String(error),
+          })
         }
       }
     }

src/frontend/src/features/layout/components/GridLayout.tsx

@@ -12,7 +12,6 @@ import { useGridLayout } from '../hooks/useGridLayout'
 import { PaginationControl } from './PaginationControl'
 import { useSpeakerPromotionTrigger } from '../hooks/useSpeakerPromotionTrigger'
 
-
 /** @public */
 export interface GridLayoutProps
   extends

src/frontend/src/features/notifications/hooks/useSoundNotification.tsx

@@ -6,7 +6,7 @@ import type { NotificationType } from '@/features/notifications/NotificationType
 // fixme - handle dynamic audio output changes
 export const useNotificationSound = () => {
   const notificationsSnap = useSnapshot(notificationsStore)
-  const [play] = useSound('./sounds/notifications.mp3', {
+  const [play] = useSound('/sounds/notifications.mp3', {
     sprite: {
       participantJoined: [0, 1150],
       handRaised: [1400, 180],

src/frontend/src/features/notifications/utils.ts

@@ -4,6 +4,7 @@ import { NotificationDuration } from './NotificationDuration'
 import type { Participant } from 'livekit-client'
 import type { NotificationPayload } from './NotificationPayload'
 import type { RecordingMode } from '@/features/recording'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const notifyAutoMutedOnJoin = () => {
   toastQueue.add(
@@ -55,7 +56,9 @@ export const decodeNotificationDataReceived = (
     return parsed as NotificationPayload
   } catch (error) {
     // Handle errors appropriately for your application
-    console.error('Failed to decode notification payload:', error)
+    reportError('generic_failure', error, {
+      context: 'Failed to decode notification payload:',
+    })
     return
   }
 }

src/frontend/src/features/participants/api/lowerHandParticipants.ts

@@ -1,5 +1,6 @@
 import type { Participant } from 'livekit-client'
 import { useLowerHandParticipant } from './lowerHandParticipant'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const useLowerHandParticipants = () => {
   const { lowerHandParticipant } = useLowerHandParticipant()
@@ -11,7 +12,9 @@ export const useLowerHandParticipants = () => {
       )
       return Promise.all(promises)
     } catch (error) {
-      console.error('An error occurred while lowering hands :', error)
+      reportError('generic_failure', error, {
+        context: 'An error occurred while lowering hands :',
+      })
       throw new Error('An error occurred while lowering hands.', {
         cause: error,
       })

src/frontend/src/features/participants/api/updateParticipantRole.ts

@@ -1,6 +1,7 @@
 import { fetchApi } from '@/api/fetchApi'
 import { useRoomData } from '@/features/rooms/livekit/hooks/useRoomData'
 import { AssignableParticipantRole } from '@/features/rooms/api/ApiRoom'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const useParticipantRole = () => {
   const data = useRoomData()
@@ -22,8 +23,11 @@ export const useParticipantRole = () => {
         }),
       })
     } catch (error) {
-      console.error(
-        `Failed to update participant's role ${identity}: ${error instanceof Error ? error.message : 'Unknown error'}`
+      reportError(
+        'generic_failure',
+        new Error(
+          `Failed to update participant's role ${identity}: ${error instanceof Error ? error.message : 'Unknown error'}`
+        )
       )
     }
   }

src/frontend/src/features/participants/hooks/useWaitingParticipants.ts

@@ -10,6 +10,7 @@ import {
 } from '../../participants/api/listWaitingParticipants'
 import { decodeNotificationDataReceived } from '@/features/notifications/utils'
 import { NotificationType } from '@/features/notifications/NotificationType'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const POLL_INTERVAL_MS = 1000
 
@@ -87,7 +88,7 @@ export const useWaitingParticipants = () => {
 
       await refetchWaiting()
     } catch (e) {
-      console.error(e)
+      reportError('generic_failure', e)
       setListEnabled(true)
     }
   }

src/frontend/src/features/pip/components/PictureInPicturePortal.tsx

@@ -7,7 +7,9 @@ import { useEffect, useMemo } from 'react'
 import { CrossDocumentOverlaysContext } from '@/primitives/CrossDocumentOverlaysContext'
 
 const InternalPortal = ({ children }: { children: React.ReactNode }) => {
-  const pipStoreSnap = useSnapshot(documentPictureInPictureStore)
+  const pipStoreSnap = useSnapshot(documentPictureInPictureStore, {
+    sync: true,
+  })
 
   const container = useMemo(() => {
     return pipStoreSnap?.window?.document.getElementById('root')
@@ -19,7 +21,7 @@ const InternalPortal = ({ children }: { children: React.ReactNode }) => {
     }
   }, [])
 
-  if (!container) return null
+  if (!container || !container.isConnected) return null
 
   return createPortal(
     /**

src/frontend/src/features/pip/hooks/usePictureInPicture.ts

@@ -1,7 +1,9 @@
 import { ref, useSnapshot } from 'valtio'
 import { useCallback, useMemo } from 'react'
+import { flushSync } from 'react-dom'
 import { documentPictureInPictureStore } from '@/stores/documentPictureInPicture'
 import { useTranslation } from 'react-i18next'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const IS_PIP_SUPPORTED =
   typeof globalThis !== 'undefined' && 'documentPictureInPicture' in globalThis
@@ -59,21 +61,29 @@ export const usePictureInPicture = () => {
       if (!IS_PIP_SUPPORTED) return null
       if (isOpen) return null
 
+      let pipWindow: Window
       try {
-        const pipWindow =
+        pipWindow =
           await // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (window as any).documentPictureInPicture.requestWindow({
             width,
             height,
           })
+      } catch {
+        // Avoid unhandled rejections if the user blocks or closes the request.
+        return null
+      }
 
+      try {
         initializeTitleAndLanguage(pipWindow, t('title'))
         initializePortalContainer(pipWindow)
         syncStyles(pipWindow)
 
         const cleanUp = () => {
           if (documentPictureInPictureStore.window === pipWindow) {
-            documentPictureInPictureStore.window = null
+            flushSync(() => {
+              documentPictureInPictureStore.window = null
+            })
           }
         }
         pipWindow.addEventListener('pagehide', () => cleanUp(), { once: true })
@@ -82,8 +92,10 @@ export const usePictureInPicture = () => {
         })
         documentPictureInPictureStore.window = ref(pipWindow)
       } catch (error) {
-        // Avoid unhandled rejections if the user blocks or closes the request.
-        console.error('Failed to open Picture-in-Picture window', error)
+        reportError('generic_failure', error, {
+          context: 'pip_init_failure',
+        })
+        pipWindow.close()
         return null
       }
     },

src/frontend/src/features/reactions/components/toolbar/ReactionButtonsContainer.tsx

@@ -26,8 +26,8 @@ const StyledContainer = styled('div', {
     backgroundColor: 'primaryDark.100',
     maxWidth: '100%',
     opacity: 0,
-    transform: 'translateY(3.25rem)',
-    transition: 'opacity, transform',
+    translate: '0 3.25rem',
+    transition: 'opacity, translate',
     transitionDuration: '0.5s',
     transitionTimingFunction: 'cubic-bezier(0.4, 0, 0.2, 1)',
     pointerEvents: 'none',
@@ -36,7 +36,7 @@ const StyledContainer = styled('div', {
     isVisible: {
       true: {
         opacity: 1,
-        transform: 'translateY(0)',
+        translate: '0 0',
         pointerEvents: 'auto',
       },
     },
@@ -84,7 +84,7 @@ export const ReactionButtonsContainer = ({
     shouldBeCenteredWithToggleButton,
     setShouldBeCenteredWithToggleButton,
   ] = useState(false)
-  const [rightOffset, setRightOffset] = useState(0)
+  const [offsetX, setOffsetX] = useState(0)
 
   const updateArrows = useCallback(() => {
     const el = scrollRef.current
@@ -115,7 +115,7 @@ export const ReactionButtonsContainer = ({
 
   useLayoutEffect(() => {
     if (!shouldBeCenteredWithToggleButton || isMobile) {
-      setRightOffset(0)
+      setOffsetX(0)
       return
     }
 
@@ -133,7 +133,7 @@ export const ReactionButtonsContainer = ({
       const containerCenterX = containerRect.left + containerRect.width / 2
       const shift = toggleCenterX - containerCenterX
       if (Math.abs(shift) < 0.5) return
-      setRightOffset((prev) => prev - shift * 2)
+      setOffsetX((prev) => prev + shift)
     }
 
     const schedule = () => {
@@ -182,7 +182,7 @@ export const ReactionButtonsContainer = ({
       isVisible={isVisible}
       style={
         shouldBeCenteredWithToggleButton && !isMobile && adjustedCentering
-          ? { marginRight: `${rightOffset}px` }
+          ? { transform: `translateX(${offsetX}px)` }
           : { margin: '0 15px' }
       }
     >

src/frontend/src/features/recording/components/ScreenRecordingSidePanel.tsx

@@ -16,7 +16,6 @@ import {
   notifyRecordingSaveInProgress,
   useNotifyParticipants,
 } from '@/features/notifications'
-import posthog from 'posthog-js'
 import { useConfig } from '@/api/useConfig'
 import { NoAccessView } from './NoAccessView'
 import { ControlsButton } from './ControlsButton'
@@ -29,6 +28,7 @@ import { useSidePanel } from '@/features/rooms/livekit/hooks/useSidePanel'
 import { useIsAdminOrOwner } from '@/features/rooms/livekit/hooks/useIsAdminOrOwner'
 import { FeatureFlags } from '@/features/analytics/enums'
 import { LimitDescription } from './LimitDescription'
+import { captureEvent, reportError } from '@/features/analytics/telemetry'
 
 export const ScreenRecordingSidePanel = () => {
   const { data } = useConfig()
@@ -63,7 +63,7 @@ export const ScreenRecordingSidePanel = () => {
     await notifyParticipants({
       type: NotificationType.ScreenRecordingRequested,
     })
-    posthog.capture('screen-recording-requested', {})
+    captureEvent('screen-recording-requested', {})
   }
 
   const handleScreenRecording = async () => {
@@ -100,13 +100,15 @@ export const ScreenRecordingSidePanel = () => {
         await notifyParticipants({
           type: NotificationType.ScreenRecordingStarted,
         })
-        posthog.capture('screen-recording-started', {
+        captureEvent('screen-recording-started', {
           includeTranscript: includeTranscript,
           language: selectedLanguageKey,
         })
       }
     } catch (error) {
-      console.error('Failed to handle recording:', error)
+      reportError('generic_failure', error, {
+        context: 'Failed to handle recording:',
+      })
     }
   }
 

src/frontend/src/features/recording/components/TranscriptSidePanel.tsx

@@ -17,7 +17,6 @@ import {
   useNotifyParticipants,
   notifyRecordingSaveInProgress,
 } from '@/features/notifications'
-import posthog from 'posthog-js'
 import { useConfig } from '@/api/useConfig'
 import { VStack } from '@/styled-system/jsx'
 import { Checkbox } from '@/primitives/Checkbox.tsx'
@@ -35,6 +34,7 @@ import { useSidePanel } from '@/features/rooms/livekit/hooks/useSidePanel'
 import { useIsAdminOrOwner } from '@/features/rooms/livekit/hooks/useIsAdminOrOwner'
 import { LimitDescription } from './LimitDescription'
 import { openSettingsDialog } from '@/stores/settings'
+import { captureEvent, reportError } from '@/features/analytics/telemetry'
 
 export const TranscriptSidePanel = () => {
   const { data } = useConfig()
@@ -76,7 +76,7 @@ export const TranscriptSidePanel = () => {
     await notifyParticipants({
       type: NotificationType.TranscriptionRequested,
     })
-    posthog.capture('transcript-requested', {})
+    captureEvent('transcript-requested', {})
   }
 
   const handleTranscript = async () => {
@@ -121,13 +121,15 @@ export const TranscriptSidePanel = () => {
         await notifyParticipants({
           type: NotificationType.TranscriptionStarted,
         })
-        posthog.capture('transcript-started', {
+        captureEvent('transcript-started', {
           includeScreenRecording: includeScreenRecording,
           language: selectedLanguageKey,
         })
       }
     } catch (error) {
-      console.error('Failed to handle transcript:', error)
+      reportError('generic_failure', error, {
+        context: 'Failed to handle transcript:',
+      })
     }
   }
 

src/frontend/src/features/recording/hooks/useRoomMetadata.ts

@@ -1,5 +1,6 @@
 import { useRoomInfo } from '@livekit/components-react'
 import { useMemo } from 'react'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const useRoomMetadata = () => {
   const { metadata } = useRoomInfo()
@@ -8,7 +9,9 @@ export const useRoomMetadata = () => {
       try {
         return JSON.parse(metadata)
       } catch (error) {
-        console.error('Failed to parse room metadata:', error)
+        reportError('generic_failure', error, {
+          context: 'Failed to parse room metadata:',
+        })
         return undefined
       }
     } else {

src/frontend/src/features/rooms/api/ApiRoom.ts

@@ -18,6 +18,14 @@ export type RoomConfiguration = {
   everyone_can_mute?: boolean | null
 }
 
+export type ParticipantRole = 'member' | 'administrator' | 'owner'
+export type AssignableParticipantRole = Exclude<ParticipantRole, 'owner'>
+
+export type ApiResourceAccess = {
+  id: string
+  role: ParticipantRole
+}
+
 export type ApiRoom = {
   id: string
   name: string
@@ -27,7 +35,12 @@ export type ApiRoom = {
   access_level: ApiAccessLevel
   livekit?: ApiLiveKit
   configuration?: RoomConfiguration
+  /**
+   * Only present in the API response when the requesting user is an
+   * administrator or owner of the room (see RoomSerializer.to_representation
+   * in the backend). Its presence can therefore be used to detect
+   * administrability outside of a LiveKit session, where the room_role
+   * participant attribute is not available.
+   */
+  accesses?: ApiResourceAccess[]
 }
-
-export type ParticipantRole = 'member' | 'administrator' | 'owner'
-export type AssignableParticipantRole = Exclude<ParticipantRole, 'owner'>

src/frontend/src/features/rooms/api/fetchRoom.ts

@@ -3,12 +3,12 @@ import { fetchApi } from '@/api/fetchApi'
 
 export const fetchRoom = ({
   roomId,
-  username = '',
+  username,
 }: {
   roomId: string
   username?: string
 }) => {
-  return fetchApi<ApiRoom>(
-    `/rooms/${roomId}?username=${encodeURIComponent(username)}`
-  )
+  const query = username ? `?username=${encodeURIComponent(username)}` : ''
+
+  return fetchApi<ApiRoom>(`/rooms/${roomId}/${query}`)
 }

src/frontend/src/features/rooms/api/muteParticipant.ts

@@ -9,6 +9,8 @@ import { fetchApi } from '@/api/fetchApi'
 import { useIsAdminOrOwner } from '../livekit/hooks/useIsAdminOrOwner'
 
 import { useCallback } from 'react'
+import { reportError } from '@/features/analytics/telemetry'
+import { getLiveKitAuthHeaders } from '../utils/getLiveKitAuthHeaders'
 
 export const useMuteParticipant = () => {
   const apiRoomData = useRoomData()
@@ -31,12 +33,15 @@ export const useMuteParticipant = () => {
 
       // Guard against undefined token for non-admin users
       if (!isAdminOrOwner && !apiRoomData.livekit.token) {
-        console.error('Cannot mute participant: missing auth token')
+        reportError(
+          'participant_mute_api_failure',
+          new Error('Cannot mute participant: missing auth token')
+        )
         return
       }
 
       const headers = !isAdminOrOwner
-        ? { Authorization: `Bearer ${apiRoomData.livekit.token}` }
+        ? getLiveKitAuthHeaders(apiRoomData.livekit.token)
         : undefined
 
       let response
@@ -53,8 +58,11 @@ export const useMuteParticipant = () => {
           }
         )
       } catch (error) {
-        console.error(
-          `Failed to mute participant ${participant.identity}: ${error instanceof Error ? error.message : 'Unknown error'}`
+        reportError(
+          'participant_mute_api_failure',
+          new Error(
+            `Failed to mute participant ${participant.identity}: ${error instanceof Error ? error.message : 'Unknown error'}`
+          )
         )
         return
       }
@@ -65,8 +73,11 @@ export const useMuteParticipant = () => {
           destinationIdentities: [participant.identity],
         })
       } catch (e) {
-        console.error(
-          `Failed to notify muted participant ${participant.identity}: ${e}`
+        reportError(
+          'participant_mute_api_failure',
+          new Error(
+            `Failed to notify muted participant ${participant.identity}: ${e}`
+          )
         )
       }
 

src/frontend/src/features/rooms/api/muteParticipants.ts

@@ -1,5 +1,6 @@
 import type { Participant } from 'livekit-client'
 import { useMuteParticipant } from './muteParticipant'
+import { reportError } from '@/features/analytics/telemetry'
 
 export const useMuteParticipants = () => {
   const { muteParticipant } = useMuteParticipant()
@@ -11,7 +12,9 @@ export const useMuteParticipants = () => {
       )
       return Promise.all(promises)
     } catch (error) {
-      console.error('An error occurred while muting participants :', error)
+      reportError('participant_mute_api_failure', error, {
+        context: 'An error occurred while muting participants :',
+      })
       throw new Error('An error occurred while muting participants.', {
         cause: error,
       })

src/frontend/src/features/rooms/api/patchRoom.tsx

@@ -2,6 +2,8 @@ import { type ApiRoom } from './ApiRoom'
 import { fetchApi } from '@/api/fetchApi'
 import { useMutation, type UseMutationOptions } from '@tanstack/react-query'
 import type { ApiError } from '@/api/ApiError'
+import { queryClient } from '@/api/queryClient'
+import { keys } from '@/api/queryKeys'
 
 export type PatchRoomParams = {
   roomId: string
@@ -15,11 +17,25 @@ export const patchRoom = ({ roomId, room }: PatchRoomParams) => {
   })
 }
 
+export const patchRoomMutationKey = ['patchRoom']
+
 export function usePatchRoom(
   options?: UseMutationOptions<ApiRoom, ApiError, PatchRoomParams>
 ) {
   return useMutation<ApiRoom, ApiError, PatchRoomParams>({
+    mutationKey: patchRoomMutationKey,
     mutationFn: patchRoom,
-    onSuccess: options?.onSuccess,
+    onMutate: async ({ roomId, room: partialRoom }) => {
+      await queryClient.cancelQueries({ queryKey: [keys.room, roomId] })
+      queryClient.setQueryData<ApiRoom>([keys.room, roomId], (previous) =>
+        previous ? { ...previous, ...partialRoom } : previous
+      )
+    },
+    onSettled: (_data, _error, { roomId }) => {
+      if (queryClient.isMutating({ mutationKey: patchRoomMutationKey }) === 1) {
+        queryClient.invalidateQueries({ queryKey: [keys.room, roomId] })
+      }
+    },
+    ...options,
   })
 }

src/frontend/src/features/rooms/api/renameParticipant.ts

@@ -1,5 +1,6 @@
 import { fetchApi } from '@/api/fetchApi'
 import { useRoomData } from '@/features/rooms/livekit/hooks/useRoomData'
+import { getLiveKitAuthHeaders } from '../utils/getLiveKitAuthHeaders'
 
 export const useRenameParticipant = () => {
   const data = useRoomData()
@@ -15,11 +16,10 @@ export const useRenameParticipant = () => {
       throw new Error('LiveKit token is not available')
     }
 
+    const headers = getLiveKitAuthHeaders(token)
     return fetchApi(`rooms/${data.id}/rename/`, {
       method: 'POST',
-      headers: {
-        Authorization: `Bearer ${token}`,
-      },
+      headers,
       body: JSON.stringify({
         name,
       }),

src/frontend/src/features/rooms/api/requestEntry.ts

@@ -1,5 +1,6 @@
 import { fetchApi } from '@/api/fetchApi'
 import type { ApiLiveKit } from '@/features/rooms/api/ApiRoom'
+import { getLobbyParticipantId } from '@/stores/lobby'
 
 export interface RequestEntryParams {
   roomId: string
@@ -15,6 +16,7 @@ export enum ApiLobbyStatus {
 }
 
 export interface ApiRequestEntry {
+  id?: string
   status: ApiLobbyStatus
   livekit?: ApiLiveKit
 }
@@ -23,10 +25,12 @@ export const requestEntry = async ({
   roomId,
   username = '',
 }: RequestEntryParams) => {
+  const participantId = getLobbyParticipantId(roomId)
   return fetchApi<ApiRequestEntry>(`/rooms/${roomId}/request-entry/`, {
     method: 'POST',
     body: JSON.stringify({
       username,
+      ...(participantId && { participant_id: participantId }),
     }),
   })
 }