sourcemod/plugins/antiflood.sp

/**
 * antiflood.sp
 * Protects against chat flooding.
 * This file is part of SourceMod, Copyright (C) 2004-2007 AlliedModders LLC
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Version: $Id$
 */

#include <sourcemod>

#pragma semicolon 1

public Plugin:myinfo = 
{
	name = "Anti-Flood",
	author = "AlliedModders LLC",
	description = "Protects against chat flooding",
	version = SOURCEMOD_VERSION,
	url = "http://www.sourcemod.net/"
};

new Float:g_LastTime[MAXPLAYERS + 1] = {0.0, ...};		/* Last time player used say or say_team */
new g_FloodTokens[MAXPLAYERS + 1] = {0, ...};			/* Number of flood tokens player has */

new Handle:sm_flood_time;								/* Handle to sm_flood_time convar */

public OnPluginStart()
{
	LoadTranslations("plugin.antiflood.cfg");
	
	RegConsoleCmd("say", CheckChatFlood);
	RegConsoleCmd("say_team", CheckChatFlood);
	sm_flood_time = CreateConVar("sm_flood_time", "0.75", "Amount of time allowed between chat messages");
}

public Action:CheckChatFlood(client, args)
{
	/* Chat from server console shouldn't be checked for flooding */
	if (client == 0)
	{
		return Plugin_Continue;
	}
	
	new Float:maxChat = GetConVarFloat(sm_flood_time);
	
	if (maxChat > 0.0)
	{
		new Float:curTime = GetGameTime();
		
		if (g_LastTime[client] > curTime)
		{
			/* If player has 3 or more flood tokens, block their message */
			if (g_FloodTokens[client] >= 3)
			{
				PrintToChat(client, "[SM] %t", "Flooding the server");
				g_LastTime[client] = curTime + maxChat + 3.0;
				
				return Plugin_Stop;	
			}
			
			/* Add one flood token when player goes over chat time limit */
			g_FloodTokens[client]++;
		} else if (g_FloodTokens[client]) {
			/* Remove one flood token when player chats within time limit (slow decay) */
			g_FloodTokens[client]--;
		}
		
		/* Store last time of chat usage */
		g_LastTime[client] = curTime + maxChat;
	}
	
	return Plugin_Continue;
}