Is there any middleware support where I can check if authentication is ok before the "connection" event fires on the socket?

[tausifcreates]

I saw a similar feature in node js socketio server (middlewares). Also, where are the reserved events, such as "connection", "disconnect" etc?

[Totodore]

You can use the whole ecosystem of middlewares from tower-http that is available for Axum.
Check the use of CorsLayer in the chat example and you can do the same with the AsyncRequireAuthorizationLayer.

With that you will protect you're entire server. If you want to only protect a namespace you can do the same thing than in the chat example. You just need the SocketReq data that is in the socket.handshake struct. With that you will be able to get your headers/uri to access credentials.

[tausifcreates]

Thanks for your response. What about the reserved events that we can see in the node js socket io server, such as "connection", "disconnect" etc?

[Totodore]

There is no custom event for the moment, there is PR open to have a disconnect event #41. There is no connect event planned but the content of the handler will be trigger when you're socket is connected