Socket.io - How to prevent users from accessing a specific channel on the server?

Question

Node.js

There is a socket.io server. There are client and server channels.
On the client side, we listen to the client channel.
There is also Elaphant.io.
When certain events occur on the server, we send a message through the elephant to the server channel. Where, in turn, the socket.io server broadcasts this message to all listeners on the client channel.
But I can easily (anyone can) write from the client
io.emit('server', 'привет медвед');
what, in turn, will be sent to the server, and the server will send it to everyone.
I have a question. can I somehow connect via the server channel only from the server's localhost? and ban others

Answer 1

The simplest thing is to send the secret key. If you delve into it, I think that you can watch the sender's IP during the handshake.