Doing it live

config.template.yaml

@@ -183,3 +183,5 @@ channel-blacklist: []
 #   * ffmpeg must be installed on the server
 ffmpeg:
   enabled: false
+
+link-domain-blacklist: []

lib/channel/chat.js

@@ -1,3 +1,4 @@
+var Config = require("../config");
 var User = require("../user");
 var XSS = require("../xss");
 var ChannelModule = require("./module");
@@ -215,6 +216,15 @@ ChatModule.prototype.handlePm = function (user, data) {
 };
 
 ChatModule.prototype.processChatMsg = function (user, data) {
+    if (data.msg.match(Config.get("link-domain-blacklist-regex"))) {
+        this.channel.logger.log(user.displayip + " (" + user.getName() + ") was kicked for " +
+                "blacklisted domain");
+        user.kick();
+        this.sendModMessage(user.getName() + " was kicked: blacklisted domain in " +
+                "chat message", 2);
+        return;
+    }
+
     if (data.msg.indexOf("/afk") === -1) {
         user.setAFK(false);
     }

lib/config.js

@@ -105,7 +105,8 @@ var defaults = {
     "channel-blacklist": [],
     ffmpeg: {
         enabled: false
-    }
+    },
+    "link-domain-blacklist": []
 };
 
 /**
@@ -333,6 +334,14 @@ function preprocessConfig(cfg) {
     });
     cfg["channel-blacklist"] = tbl;
 
+    if (cfg["link-domain-blacklist"].length > 0) {
+        cfg["link-domain-blacklist-regex"] = new RegExp(
+                cfg["link-domain-blacklist"].join("|").replace(/\./g, "\\."), "gi");
+    } else {
+        // Match nothing
+        cfg["link-domain-blacklist-regex"] = new RegExp("$^", "gi");
+    }
+
     return cfg;
 }