src/network/nSpamProtection.cpp

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/*

*************************************************************************

ArmageTron -- Just another Tron Lightcycle Game in 3D.
Copyright (C) 2000  Manuel Moos (manuel@moosnet.de)

**************************************************************************

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.
  
***************************************************************************

*/

#include "nSpamProtection.h"
#include "nConfig.h"
#include "tSysTime.h"

static REAL se_SpamProtection = 4.0f;   // degree of spam protection
static REAL se_SpamPenalty        = 10.0f;      // silence penalty when found guilty of spamming
static REAL se_SpamAutoKick       = 20.0f;      // spam value that causes someone to get instantly kicked.
int                     se_SpamMaxLen     = 80;         // maximal length of chat message

static tSettingItem<REAL> se_SPR("SPAM_PROTECTION",
                                 se_SpamProtection);
static tSettingItem<REAL> se_SPE("SPAM_PENALTY",
                                 se_SpamPenalty);
static tSettingItem<REAL> se_SAK("SPAM_AUTOKICK",
                                 se_SpamAutoKick);
static nSettingItemWatched<int> se_SML("SPAM_MAXLEN",
                                       se_SpamMaxLen,
                                       nConfItemVersionWatcher::Group_Cheating,
                                       3 );


nSpamProtectionSettings::nSpamProtectionSettings( REAL timeScale, char const * timeScaleConfig, const tOutput& silence )
        : timeScale_( timeScale ), silence_( silence ), timeScaleSetting_( timeScaleConfig, timeScale_ )
{
}

nSpamProtection::nSpamProtection( const nSpamProtectionSettings& settings )
        : settings_( settings ), spamProtect_( 0.0f ), spamProtectTime_( tSysTimeFloat( ))
{
}

nSpamProtection::~nSpamProtection( void )
{
}

REAL    nSpamProtection::BlockTime()                                    // time left in silenced mode
{
    REAL timeScale = this->settings_.timeScale_ * se_SpamProtection;
    return ( spamProtect_ - 6 ) * timeScale + ( tSysTimeFloat() - spamProtectTime_ );
}

nSpamProtection::Level  nSpamProtection::CheckSpam( REAL spamlevel, int userToKick, tOutput const & reason )    // check if someone is spamming
{
    if ( se_SpamProtection < 0.01f )
    {
        se_SpamProtection = 0.01f;
    }

    REAL timeScale = this->settings_.timeScale_ * se_SpamProtection;

    spamProtect_ += spamlevel;
    spamProtect_ -=( tSysTimeFloat() - spamProtectTime_ ) / timeScale;

    spamProtectTime_ = tSysTimeFloat();
    if ( spamProtect_ < 0 )
        spamProtect_ = 0;

    if ( spamProtect_ > 6 ){
        tOutput message;
        spamProtect_ += se_SpamPenalty;

        message.SetTemplateParameter(1, ( spamProtect_ - 6 ) * timeScale );
        message.Append( settings_.silence_ );

        //              message << ColorString (1,1,0);
        //              message << "$spam_protection";

        sn_ConsoleOut(message,userToKick);

        if ( spamProtect_ > se_SpamAutoKick )
        {
            tOutput message( "$network_kill_spamkick" );
            message.Append( " " );
            message.Append( reason );
            sn_KickUser( userToKick, message );

            return Level_Hard;
        }

        return Level_Mild;
    }

    return Level_Ok;
}

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