author  nemo 
Sat, 21 May 2016 15:23:08 0400  
changeset 11831  dd18d8100afd 
parent 11466  4b5c7a5c49fd 
child 14841  111c4d750c6d 
permissions  rwrr 
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Gianfranco Costamagna <costamagnagianfranco@yahoo.it>
parents:
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1 
{ 
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* Hedgewars, a free turn based strategy game 
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* Copyright (c) 20042015 Andrey Korotaev <unC0Rr@gmail.com> 
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* 
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* This program is free software; you can redistribute it and/or modify 
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* it under the terms of the GNU General Public License as published by 
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parents:
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* the Free Software Foundation; version 2 of the License 
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* 
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* This program is distributed in the hope that it will be useful, 
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* but WITHOUT ANY WARRANTY; without even the implied warranty of 
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
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* GNU General Public License for more details. 
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* 
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* You should have received a copy of the GNU General Public License 
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* along with this program; if not, write to the Free Software 
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA. 
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\} 
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{# LANGUAGE OverloadedStrings, BangPatterns #} 
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module FloodDetection where 
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import Control.Monad.State.Strict 
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import Data.Time 

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import Control.Arrow 

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import ServerState 

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import CoreTypes 
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import Utils 
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registerEvent :: Event > StateT ServerState IO [Action] 
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registerEvent e = do 

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eventInfo < client's $ einfo e 

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if (null eventInfo)  0 == (fst $ head eventInfo) then doCheck eventInfo else updateInfo 
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10093  35 
where 
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einfo LobbyChatMessage = eiLobbyChat 

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einfo EngineMessage = eiEM 

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einfo RoomJoin = eiJoin 

10094  39 

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transformField LobbyChatMessage f = \c > c{eiLobbyChat = f $ eiLobbyChat c} 
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transformField EngineMessage f = \c > c{eiEM = f $ eiEM c} 
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transformField RoomJoin f = \c > c{eiJoin = f $ eiJoin c} 

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boundaries :: Event > (Int, (NominalDiffTime, Int), (NominalDiffTime, Int), ([Action], [Action])) 
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boundaries LobbyChatMessage = (3, (10, 2), (30, 3), (chat1, chat2)) 

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boundaries EngineMessage = (8, (10, 4), (25, 5), (em1, em2)) 

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boundaries RoomJoin = (2, (10, 2), (35, 3), (join1, join2)) 

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chat1 = [Warning $ loc "Warning! Chat flood protection activated"] 

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chat2 = [ByeClient $ loc "Excess flood"] 

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em1 = [Warning $ loc "Game messages flood detected  1"] 

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em2 = [ByeClient $ loc "Excess flood"] 
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join1 = [Warning $ loc "Warning! Joins flood protection activated"] 
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join2 = [ByeClient $ loc "Excess flood"] 

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doCheck ei = do 
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curTime < io getCurrentTime 
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let (numPerEntry, (sec1, num1), (sec2, num2), (ac1, ac2)) = boundaries e 
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let nei = takeWhile ((>=) sec2 . diffUTCTime curTime . snd) ei 

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let l2 = length nei 

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let l1 = length $ takeWhile ((>=) sec1 . diffUTCTime curTime . snd) nei 

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let actions = if l2 >= num2 + 1  l1 >= num1 + 1 then 
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ac2 

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else 

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if l1 >= num1  l2 >= num2 then 

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ac1 

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else 

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[] 

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return $ [ModifyClient . transformField e . const $ (numPerEntry, curTime) : nei 
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, ModifyClient (\c > c{pendingActions = actions})  append? prepend? just replacing for now 
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] 
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updateInfo = return [ 
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ModifyClient $ transformField e 
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$ \(h:hs) > first (flip () 1) h : hs 

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] 