Auto ban anonymous IP:

* New settings: "Ban anonymous user's IP when user is banned from a chatroom":
  * if enabled, every time a streamer bans an anonymous user, it will ban its IP on the chat server,
  * banned IPs are logged on disk, so server's admin can use them to feed fail2ban (for example),
  * option disabled by default, because could be used to create trapped-rooms on public servers

server/lib/prosody/config/content.ts

@@ -207,10 +207,13 @@ class ProsodyConfigContent {
     this.muc.set('muc_room_default_history_length', 20)
   }
 
-  useAnonymous (): void {
+  useAnonymous (autoBanIP: boolean): void {
     this.anon = new ProsodyConfigVirtualHost('anon.' + this.prosodyDomain)
     this.anon.set('authentication', 'anonymous')
     this.anon.set('modules_enabled', ['ping'])
+    if (autoBanIP) {
+      this.anon.add('modules_enabled', 'muc_ban_ip')
+    }
   }
 
   useHttpAuthentication (url: string): void {