A very simple anti link-spam thingy.

I've tried to set it as high as possible without it being uncomfortable. But if text-links seem unresponsive just lower TOPIC_SPAM_DELAY. It's currently set to half a second. That means that a client can only click one link every half-second rather than upwards of 10 a second. So about a 80% reduction.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3682 316c924e-a436-60f5-8080-3fe189b3f50e

code/datums/datumvars.dm

@@ -389,9 +389,17 @@ client
 
 		return html
 
+#define TOPIC_SPAM_DELAY 5		//5 tick delay is a little under half a second
 //All BYOND links pass through client/Topic() FIRST and are then directed to [hsrc]/Topic() by the ..() call at the end.
 client/Topic(href, href_list, hsrc)
 
+	if(next_allowed_topic_time > world.time)
+		//we have previously sent a Topic() call withing the last [TOPIC_SPAM_DELAY] ticks.
+		//drop the Topic call to preventc crashing/lagging the server via link-spamming
+//		src << "\red Error: SPAM"
+		return
+	next_allowed_topic_time = world.time + TOPIC_SPAM_DELAY
+
 	//search the href for script injection	//This is a temporary measure
 	if( findtext(href,"<script",1,0) )
 		world.log << "Attempted use of scripts within a topic call, by [src]"