AcediaFixes/sources/FixFFHack/FFHackRule.uc

/**
 *      This rule detects suspicious attempts to deal damage and
 *    applies friendly fire scaling according to `FixFFHack`'s rules.
 *      Copyright 2019 Anton Tarasenko
 *------------------------------------------------------------------------------
 * This file is part of Acedia.
 *
 * Acedia 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, version 3 of the License, or
 * (at your option) any later version.
 *
 * Acedia 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 Acedia.  If not, see <https://www.gnu.org/licenses/>.
 */
class FFHackRule extends GameRules;

function int NetDamage(
    int                 originalDamage,
    int                 damage,
    Pawn                injured,
    Pawn                instigator,
    Vector              hitLocation,
    out Vector          momentum,
    class<DamageType>   damageType
)
{
    local KFGameType    gameType;
    local FixFFHack     ffHackFix;
    gameType = KFGameType(level.game);
    //  Something is very wrong and we can just bail on this damage
    if (damageType == none || gameType == none) {
        return 0;
    }

    //  We only check when suspicious instigators that aren't a world
    if (!damageType.default.bCausedByWorld && IsSuspicious(instigator))
    {
        ffHackFix = FixFFHack(class'FixFFHack'.static.GetInstance());
        if (ffHackFix != none && ffHackFix.ShouldScaleDamage(damageType))
        {
            //  Remove pushback to avoid environmental kills
            momentum = Vect(0.0, 0.0, 0.0);
            damage *= gameType.friendlyFireScale;
        }
    }
    return super.NetDamage( originalDamage, damage, injured, instigator,
                            hitLocation, momentum, damageType);
}

private function bool IsSuspicious(Pawn instigator)
{
    //  Instigator vanished
    if (instigator == none) return true;

    //  Instigator already became spectator
    if (KFPawn(instigator) != none)
    {
        if (instigator.playerReplicationInfo != none)
        {
            return instigator.playerReplicationInfo.bOnlySpectator;
        }
        return true; // Replication info is gone => suspicious
    }
    return false;
}

defaultproperties
{
}