root: add lifespan shim to prevent errors

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/root/asgi.py

@@ -20,11 +20,34 @@ django.setup()
 # pylint: disable=wrong-import-position
 from authentik.root import websocket  # noqa  # isort:skip
 
+
+class LifespanApp:
+    """
+    temporary shim for https://github.com/django/channels/issues/1216
+    needed so that hypercorn doesn't display an error.
+    this uses ASGI 2.0 format, not the newer 3.0 single callable
+    """
+
+    def __init__(self, scope):
+        self.scope = scope
+
+    async def __call__(self, receive, send):
+        if self.scope["type"] == "lifespan":
+            while True:
+                message = await receive()
+                if message["type"] == "lifespan.startup":
+                    await send({"type": "lifespan.startup.complete"})
+                elif message["type"] == "lifespan.shutdown":
+                    await send({"type": "lifespan.shutdown.complete"})
+                    return
+
+
 application = SentryAsgiMiddleware(
     ProtocolTypeRouter(
         {
             "http": get_asgi_application(),
             "websocket": URLRouter(websocket.websocket_urlpatterns),
+            "lifespan": LifespanApp,
         }
     )
 )