restrict access to metadata

lib/commands/channel.js

@@ -261,6 +261,8 @@ Channel.writePrivateMessage = function (Env, args, cb, Server) {
         msg // the actual message content. Generally a string
     ];
 
+    // XXX RESTRICT respect allow lists
+
     // historyKeeper already knows how to handle metadata and message validation, so we just pass it off here
     // if the message isn't valid it won't be stored.
     Env.historyKeeper.channelMessage(Server, channelStruct, fullMessage);