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                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
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            How to Apply These Terms to Your New Programs
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 Also add information on how to contact you by electronic and paper mail.
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 The hypothetical commands `show w' and `show c' should show the appropriate
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 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/sources/FixAmmoSelling/AmmoPickupStalker.uc
+++ b/sources/FixAmmoSelling/AmmoPickupStalker.uc
@ -0,0 +1,85 @@
 /**
 *      This actor attaches itself to the ammo boxes
 *  and imitates their collision to let us detect when they're picked up.
 *      Copyright 2020 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 AmmoPickupStalker extends Actor;
 //  Ammo box this stalker is attached to.
 //  If it is destroyed (not just picked up) - stalker must die too.
 var private KFAmmoPickup target;
 //      This variable is used to record if our 'target' ammo box was in
 //  active state ('Pickup') last time we've checked.
 //  We need this because ammo box's 'Touch' event can fire off first and
 //  force the box to sleep before stalker could catch same event.
 //  Without this variable we would have no way to know if player
 //  simply walked near the place of a sleeping box or actually grabbed it.
 var private bool wasActive;
 //      Static function that spawns a new stalker for the given box.
 //      Careful, as there's no checks for whether a stalker is
 //  already attached to it.
 //  Ensuring that is on the user of the function.
 public final static function StalkAmmoPickup(KFAmmoPickup newTarget)
 {
    local AmmoPickupStalker newStalker;
    if (newTarget == none) return;
    newStalker = newTarget.Spawn(class'AmmoPickupStalker');
    newStalker.target = newTarget;
    newStalker.SetBase(newTarget);
    newStalker.SetCollision(true);
    newStalker.SetCollisionSize(newTarget.collisionRadius,
                                newTarget.collisionHeight);
 }
 event Touch(Actor other)
 {
    local FixAmmoSelling ammoSellingFix;
    if (target == none)                             return;
    //      If our box was sleeping for while (more than a tick), -
    //  player couldn't have gotten any ammo.
    if (!wasActive && !target.IsInState('Pickup'))  return;
    ammoSellingFix = FixAmmoSelling(class'FixAmmoSelling'.static.GetInstance());
    if (ammoSellingFix != none)
    {
        ammoSellingFix.RecordAmmoPickup(Pawn(other), target);
    }
 }
 event Tick(float delta)
 {
    if (target != none)
    {
        wasActive = target.IsInState('Pickup');
    }
    else
    {
        Destroy();
    }
 }
 defaultproperties
 {
    //  Server-only, hidden
    remoteRole      = ROLE_None
    bAlwaysRelevant = true
    drawType        = DT_None
 }
--- a/sources/FixAmmoSelling/FixAmmoSelling.uc
+++ b/sources/FixAmmoSelling/FixAmmoSelling.uc
@ -0,0 +1,396 @@
 /**
 *      This feature addressed an oversight in vanilla code that
 *  allows clients to sell weapon's ammunition.
 *  Moreover, when being sold, ammunition cost is always multiplied by 0.75,
 *  without taking into an account possible discount a player might have.
 *  This allows cheaters to "print money" by buying and selling ammo over and
 *  over again ammunition for some weapons,
 *  notably pipe bombs (74% discount for lvl6 demolition)
 *  and crossbow (42% discount for lvl6 sharpshooter).
 *
 *      This feature fixes this problem by setting 'pickupClass' variable in
 *  potentially abusable weapons to our own value that won't receive a discount.
 *  Luckily for us, it seems that pickup spawn and discount checks are the only
 *  two place where variable is directly checked in a vanilla game's code
 *  ('default.pickupClass' is used everywhere else),
 *  so we can easily deal with the side effects of such change.
 *      Copyright 2020 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 FixAmmoSelling extends Feature
    config(AcediaFixes);
 /**
 *      We will replace 'pickupClass' variable for all instances of potentially
 *  abusable weapons. That is weapons, that have a discount for their ammunition
 *  (via 'GetAmmoCostScaling' function in a corresponding perk class).
 *  They are defined (along with our pickup replacements) in 'rules' array.
 *  That array isn't configurable, since the abusable status is hardcoded into
 *  perk classes and the main mod that allows to change those (ServerPerks),
 *  also solves ammo selling by a more direct method
 *  (only available for the mods that replace player pawn class).
 *  This change already completely fixes ammo printing.
 *      Possible concern with changing the value of 'pickupClass' is that
 *  it might affect gameplay in too many ways.
 *  But, luckily for us, that value is only used when spawning a new pickup and
 *  in 'ServerBuyAmmo' function of 'KFPawn'
 *  (all the other places use it's default value instead).
 *  This means that the only two side-effects of our change are:
 *      1. That wrong pickup class will be spawned. This problem is easily
 *          solved by replacing spawned actor in 'CheckReplacement'.
 *      2. That ammo will be sold at a different (lower for us) price,
 *          while trader would still display and require the original price.
 *          This problem is solved by manually taking from player the difference
 *          between what he should have had to pay and what he actually paid.
 *      This brings us to the second issue -
 *  detecting when player bought the ammo.
 *  Unfortunately, it doesn't seem possible to detect with 100% certainty
 *  without replacing pawn or shop classes,
 *  so we have to eliminate other possibilities.
 *  There are seem to be three ways for players to get more ammo:
 *  1. For some mod to give it;
 *  2. Found it an ammo box;
 *  3. To buy ammo (can only happen in trader).
 *  We don't want to provide mods with low-level API for bug fixes,
 *  so to ensure the compatibility, mods that want to increase ammo values
 *  will have to solve compatibility issue by themselves:
 *  either by reimplementing this fix (possibly the best option)
 *  or by giving players appropriate money along with the ammo.
 *      The only other case we have to eliminate is ammo boxes.
 *  First, all cases of ammo boxes outside the trader are easy to detect,
 *  since in this case we can be sure that player didn't buy ammo
 *  (and mods that can allow it can just get rid of
 *  'ServerSellAmmo' function directly, similarly to how ServerPerks does it).
 *  We'll detect all the other boxes by attaching an auxiliary actor
 *  ('AmmoPickupStalker') to them, that will fire off 'Touch' event
 *  at the same time as ammo boxes.
 *      The only possible problem is that part of the ammo cost is
 *  taken with a slight delay, which leaves cheaters a window of opportunity
 *  to buy more than they can afford.
 *  This issue is addressed by each ammo type costing as little as possible
 *  (its' cost for corresponding perk at lvl6)
 *  and a flag that does allow players to go into negative dosh values
 *  (the cost is potential bugs in this fix itself, that
 *  can somewhat affect regular players).
 */
 //      Due to how this fix works, players with level below 6 get charged less
 //  than necessary by the shop and this fix must take the rest of
 //  the cost by itself.
 //      The problem is, due to how ammo purchase is coded, low-level (<6 lvl)
 //  players can actually buy more ammo for "fixed" weapons than they can afford
 //  by filling ammo for one or all weapons.
 //      Setting this flag to 'true' will allow us to still take full cost
 //  from them, putting them in "debt" (having negative dosh amount).
 //  If you don't want to have players with negative dosh values on your server
 //  as a side-effect of this fix, then leave this flag as 'false',
 //  letting low level players buy ammo cheaper
 //  (but not cheaper than lvl6 could).
 //      NOTE: this issue doesn't affect level 6 players.
 //      NOTE #2: this fix does give players below level 6 some
 //  technical advantage compared to vanilla game, but this advantage
 //  cannot exceed benefits of having level 6.
 var private config const bool allowNegativeDosh;
 //      This structure records what classes of weapons can be abused
 //  and what pickup class we should use to fix the exploit.
 struct ReplacementRule
 {
    var class<KFWeapon>         abusableWeapon;
    var class<KFWeaponPickup>   pickupReplacement;
 };
 //  Actual list of abusable weapons.
 var private const array<ReplacementRule> rules;
 //      We create one such record for any
 //  abusable weapon instance in the game to store:
 struct WeaponRecord
 {
    //  The instance itself.
    var KFWeapon        weapon;
    //      Corresponding ammo instance
    //  (all abusable weapons only have one ammo type).
    var KFAmmunition    ammo;
    //      Last ammo amount we've seen, used to detect players gaining ammo
    //  (from either ammo boxes or buying it).
    var int             lastAmmoAmount;
 };
 //  All weapons we've detected so far.
 var private array<WeaponRecord> registeredWeapons; 
 protected function OnEnabled()
 {
    local KFWeapon      nextWeapon;
    local KFAmmoPickup  nextPickup;
    //  Find all abusable weapons
    foreach level.DynamicActors(class'KFMod.KFWeapon', nextWeapon)
    {
        FixWeapon(nextWeapon);
    }
    //  Start tracking all ammo boxes
    foreach level.DynamicActors(class'KFMod.KFAmmoPickup', nextPickup)
    {
        class'AmmoPickupStalker'.static.StalkAmmoPickup(nextPickup);
    }
 }
 protected function OnDisabled()
 {
    local int                       i;
    local AmmoPickupStalker         nextStalker;
    local array<AmmoPickupStalker>  stalkers;
    //  Restore all the 'pickupClass' variables we've changed.
    for (i = 0; i < registeredWeapons.length; i += 1)
    {
        if (registeredWeapons[i].weapon != none)
        {
            registeredWeapons[i].weapon.pickupClass =
                registeredWeapons[i].weapon.default.pickupClass;
        }
    }
    registeredWeapons.length = 0;
    //  Kill all the stalkers;
    //  to be safe, avoid destroying them directly in the iterator.
    foreach level.DynamicActors(class'AmmoPickupStalker', nextStalker)
    {
        stalkers[stalkers.length] = nextStalker;
    }
    for (i = 0; i < stalkers.length; i += 1)
    {
        if (stalkers[i] != none)
        {
            stalkers[i].Destroy();
        }
    }
 }
 //  Checks if given class is a one of our pickup replacer classes.
 public static final function bool IsReplacer(class<Actor> pickupClass)
 {
    local int i;
    if (pickupClass == none) return false;
    for (i = 0; i < default.rules.length; i += 1)
    {
        if (pickupClass == default.rules[i].pickupReplacement)
        {
            return true;
        }
    }
    return false;
 }
 //  1. Checks if weapon can be abused and if it can, - fixes the problem.
 //  2. Starts tracking abusable weapon to detect when player buys ammo for it.
 public final function FixWeapon(KFWeapon potentialAbuser)
 {
    local int           i;
    local WeaponRecord  newRecord;
    if (potentialAbuser == none) return;
    for (i = 0; i < registeredWeapons.length; i += 1)
    {
        if (registeredWeapons[i].weapon == potentialAbuser)
        {
            return;
        }
    }
    for (i = 0; i < rules.length; i += 1)
    {
        if (potentialAbuser.class == rules[i].abusableWeapon)
        {
            potentialAbuser.pickupClass = rules[i].pickupReplacement;
            newRecord.weapon = potentialAbuser;
            registeredWeapons[registeredWeapons.length] = newRecord;
            return;
        }
    }
 }
 //  Finds ammo instance for recorded weapon in it's owner's inventory.
 private final function WeaponRecord FindAmmoInstance(WeaponRecord record)
 {
    local Inventory     invIter;
    local KFAmmunition  ammo;
    if (record.weapon == none)              return record;
    if (record.weapon.instigator == none)   return record;
    //  Find instances anew
    invIter = record.weapon.instigator.inventory;
    while (invIter != none)
    {
        if (record.weapon.ammoClass[0] == invIter.class)
        {
            ammo = KFAmmunition(invIter);
        }
        invIter = invIter.inventory;
    }
    //  Add missing instances
    if (ammo != none)
    {
        record.ammo = ammo;
        record.lastAmmoAmount = ammo.ammoAmount;
    }
    return record;
 }
 //      Calculates how much more player should have paid for 'ammoAmount'
 //  amount of ammo, compared to how much trader took after our fix.
 private final function float GetPriceCorrection
 (
    KFWeapon kfWeapon,
    int ammoAmount
 )
 {
    local float                     boughtMagFraction;
    //      'vanillaPrice' - price that would be calculated
    //  without our interference
    //      'fixPrice' - price that will be calculated after
    //  we've replaced pickup class
    local float                     vanillaPrice, fixPrice;
    local KFPlayerReplicationInfo   kfRI;
    local class<KFWeaponPickup>     vanillaPickupClass, fixPickupClass;
    if (kfWeapon == none || kfWeapon.instigator == none)        return 0.0;
    fixPickupClass = class<KFWeaponPickup>(kfWeapon.pickupClass);
    vanillaPickupClass = class<KFWeaponPickup>(kfWeapon.default.pickupClass);
    if (fixPickupClass == none || vanillaPickupClass == none)   return 0.0;
    //  Calculate base prices
    boughtMagFraction = (float(ammoAmount) / kfWeapon.default.magCapacity);
    fixPrice = boughtMagFraction * fixPickupClass.default.AmmoCost;
    vanillaPrice = boughtMagFraction * vanillaPickupClass.default.AmmoCost;
    //  Apply perk discount for vanilla price
    //  (we don't need to consider secondary ammo or husk gun special cases,
    //  since such weapons can't be abused via ammo dosh-printing)
    kfRI = KFPlayerReplicationInfo(kfWeapon.instigator.playerReplicationInfo);
    if (kfRI != none && kfRI.clientVeteranSkill != none)
    {
        vanillaPrice *= kfRI.clientVeteranSkill.static.
            GetAmmoCostScaling(kfRI, vanillaPickupClass);
    }
    //      TWI's code rounds up ammo cost
    //  to the integer value whenever ammo is bought,
    //  so to calculate exactly how much we need to correct the cost,
    //  we must find difference between the final, rounded cost values.
    return float(Max(0, int(vanillaPrice) - int(fixPrice)));
 }
 //      Takes current ammo and last recorded in 'record' value to calculate
 //  how much money to take from the player
 //  (calculations are done via 'GetPriceCorrection').
 private final function WeaponRecord TaxAmmoChange(WeaponRecord record)
 {
    local int                   ammoDiff;
    local KFPawn                taxPayer;
    local PlayerReplicationInfo replicationInfo;
    taxPayer = KFPawn(record.weapon.instigator);
    if (record.weapon == none || taxPayer == none)  return record;
    //      No need to charge money if player couldn't have
    //  possibly bought the ammo.
    if (!taxPayer.CanBuyNow())                      return record;
    //  Find ammo difference with recorded value.
    if (record.ammo != none)
    {
        ammoDiff = Max(0, record.ammo.ammoAmount - record.lastAmmoAmount);
        record.lastAmmoAmount = record.ammo.ammoAmount;
    }
    //  Make player pay dosh
    replicationInfo = taxPayer.playerReplicationInfo;
    if (replicationInfo != none)
    {
        replicationInfo.score -= GetPriceCorrection(record.weapon, ammoDiff);
        //      This shouldn't happen, since shop is supposed to make sure
        //  player has enough dosh to buy ammo at full price
        //  (actual price + our correction).
        //      But if user is extra concerned about it, -
        //  we can additionally for force the score above 0.
        if (!allowNegativeDosh)
        {
            replicationInfo.score = FMax(0, replicationInfo.score);
        }
    }
    return record;
 }
 //      Changes our records to account for player picking up the ammo box,
 //  to avoid charging his for it.
 public final function RecordAmmoPickup(Pawn pawnWithAmmo, KFAmmoPickup pickup)
 {
    local int i;
    local int newAmount;
    //  Check conditions from 'KFAmmoPickup' code ('Touch' function)
    if (pickup == none)                                     return;
    if (pawnWithAmmo == none)                               return;
    if (pawnWithAmmo.controller == none)                    return;
    if (!pawnWithAmmo.bCanPickupInventory)                  return;
    if (!FastTrace(pawnWithAmmo.location, pickup.location)) return;
    //  Add relevant amount of ammo to our records
    for (i = 0; i < registeredWeapons.length; i += 1)
    {
        if (registeredWeapons[i].weapon == none) continue;
        if (registeredWeapons[i].weapon.instigator == pawnWithAmmo)
        {
            newAmount = registeredWeapons[i].lastAmmoAmount
                + registeredWeapons[i].ammo.ammoPickupAmount;
            newAmount = Min(registeredWeapons[i].ammo.maxAmmo, newAmount);
            registeredWeapons[i].lastAmmoAmount = newAmount;
        }
    }
 }
 event Tick(float delta)
 {
    local int i;
    //  For all the weapon records...
    i = 0;
    while (i < registeredWeapons.length)
    {
        //  ...remove dead records
        if (registeredWeapons[i].weapon == none)
        {
            registeredWeapons.Remove(i, 1);
            continue;
        }
        //  ...find ammo if it's missing
        if (registeredWeapons[i].ammo == none)
        {
            registeredWeapons[i] = FindAmmoInstance(registeredWeapons[i]);
        }
        //  ...tax for ammo, if we can
        registeredWeapons[i] = TaxAmmoChange(registeredWeapons[i]);
        i += 1;
    }
 }
 defaultproperties
 {
    allowNegativeDosh = false
    rules(0)=(abusableWeapon=class'KFMod.Crossbow',pickupReplacement=class'FixAmmoSellingClass_CrossbowPickup')
    rules(1)=(abusableWeapon=class'KFMod.PipeBombExplosive',pickupReplacement=class'FixAmmoSellingClass_PipeBombPickup')
    rules(2)=(abusableWeapon=class'KFMod.M79GrenadeLauncher',pickupReplacement=class'FixAmmoSellingClass_M79Pickup')
    rules(3)=(abusableWeapon=class'KFMod.GoldenM79GrenadeLauncher',pickupReplacement=class'FixAmmoSellingClass_GoldenM79Pickup')
    rules(4)=(abusableWeapon=class'KFMod.M32GrenadeLauncher',pickupReplacement=class'FixAmmoSellingClass_M32Pickup')
    rules(5)=(abusableWeapon=class'KFMod.CamoM32GrenadeLauncher',pickupReplacement=class'FixAmmoSellingClass_CamoM32Pickup')
    rules(6)=(abusableWeapon=class'KFMod.LAW',pickupReplacement=class'FixAmmoSellingClass_LAWPickup')
    rules(7)=(abusableWeapon=class'KFMod.SPGrenadeLauncher',pickupReplacement=class'FixAmmoSellingClass_SPGrenadePickup')
    rules(8)=(abusableWeapon=class'KFMod.SealSquealHarpoonBomber',pickupReplacement=class'FixAmmoSellingClass_SealSquealPickup')
    rules(9)=(abusableWeapon=class'KFMod.SeekerSixRocketLauncher',pickupReplacement=class'FixAmmoSellingClass_SeekerSixPickup')
    //  Listeners
    requiredListeners(0) = class'MutatorListener_FixAmmoSelling'
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_CamoM32Pickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_CamoM32Pickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for M32 to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_CamoM32Pickup extends CamoM32Pickup;
 defaultproperties
 {
    AmmoCost = 42
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_CrossbowPickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_CrossbowPickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for xbow to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_CrossbowPickup extends CrossbowPickup;
 defaultproperties
 {
 	AmmoCost = 11.6
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_GoldenM79Pickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_GoldenM79Pickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for m79 to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_GoldenM79Pickup extends GoldenM79Pickup;
 defaultproperties
 {
    AmmoCost = 7
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_LAWPickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_LAWPickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for LAW to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_LAWPickup extends LAWPickup;
 defaultproperties
 {
    AmmoCost = 21
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_M32Pickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_M32Pickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for M32 to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_M32Pickup extends M32Pickup;
 defaultproperties
 {
    AmmoCost = 42
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_M79Pickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_M79Pickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for M79 to that
 *  of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_M79Pickup extends M79Pickup;
 defaultproperties
 {
    AmmoCost = 7
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_PipeBombPickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_PipeBombPickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for pipes
 *  to that of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_PipeBombPickup extends PipeBombPickup;
 defaultproperties
 {
    AmmoCost = 195
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SPGrenadePickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SPGrenadePickup.uc
@ -0,0 +1,27 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for
 *  orca grnade launcher to that of a level 6 player
 *  and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_SPGrenadePickup extends SPGrenadePickup;
 defaultproperties
 {
    AmmoCost = 7
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SealSquealPickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SealSquealPickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for harpoon
 *  to that of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_SealSquealPickup extends SealSquealPickup;
 defaultproperties
 {
    AmmoCost = 21
 }
--- a/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SeekerSixPickup.uc
+++ b/sources/FixAmmoSelling/FixedClasses/FixAmmoSellingClass_SeekerSixPickup.uc
@ -0,0 +1,26 @@
 /**
 *      A helper class for 'FixAmmoSelling' that sets ammo cost for seeker
 *  to that of a level 6 player and doesn't allow for a perk discount.
 *      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 FixAmmoSellingClass_SeekerSixPickup extends SeekerSixPickup;
 defaultproperties
 {
    AmmoCost = 10.5
 }
--- a/sources/FixAmmoSelling/MutatorListener_FixAmmoSelling.uc
+++ b/sources/FixAmmoSelling/MutatorListener_FixAmmoSelling.uc
@ -0,0 +1,97 @@
 /**
 *      Overloaded mutator events listener to register every new
 *  spawned weapon and ammo pickup.
 *      Copyright 2020 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 MutatorListener_FixAmmoSelling extends MutatorListenerBase
    abstract;
 static function bool CheckReplacement(Actor other, out byte isSuperRelevant)
 {
    if (other == none) return true;
    //      We need to replace pickup classes back,
    //  as they might not even exist on clients.
    if (class'FixAmmoSelling'.static.IsReplacer(other.class))
    {
 		ReplacePickupWith(Pickup(other));
        return false;
    }
    CheckAbusableWeapon(KFWeapon(other));
    //  If it's ammo pickup - we need to stalk it
    class'AmmoPickupStalker'.static.StalkAmmoPickup(KFAmmoPickup(other));
    return true;
 }
 private static function CheckAbusableWeapon(KFWeapon newWeapon)
 {
    local FixAmmoSelling ammoSellingFix;
    if (newWeapon == none)      return;
    ammoSellingFix = FixAmmoSelling(class'FixAmmoSelling'.static.GetInstance());
    if (ammoSellingFix == none) return;
    ammoSellingFix.FixWeapon(newWeapon);
 }
 //      This function recreates the logic of 'KFWeapon.DropFrom()',
 //  since standard 'ReplaceWith' function produces bad results.
 private static function ReplacePickupWith(Pickup oldPickup)
 {
    local Pawn      instigator;
    local Pickup    newPickup;
    local KFWeapon  relevantWeapon;
    if (oldPickup == none)              return;
    instigator = oldPickup.instigator;
    if (instigator == none)             return;
    relevantWeapon = GetWeaponOfClass(instigator, oldPickup.inventoryType);
    if (relevantWeapon == none)         return;
    newPickup = relevantWeapon.Spawn(   relevantWeapon.default.pickupClass,,,
                                        relevantWeapon.location);
    newPickup.InitDroppedPickupFor(relevantWeapon);
    newPickup.velocity = relevantWeapon.velocity +
        Vector(instigator.rotation) * 100;
    if (instigator.health > 0)
        KFWeaponPickup(newPickup).bThrown = true;
 }
 //  TODO: this is code duplication, some sort of solution is needed
 static final function KFWeapon GetWeaponOfClass
 (
    Pawn                playerPawn,
    class<Inventory>    weaponClass
 )
 {
    local Inventory invIter;
    if (playerPawn == none) return none;
    invIter = playerPawn.inventory;
    while (invIter != none)
    {
        if (invIter.class == weaponClass)
        {
            return KFWeapon(invIter);
        }
        invIter = invIter.inventory;
    }
    return none;
 }
 defaultproperties
 {
    relatedEvents = class'MutatorEvents'
 }
--- a/sources/FixDoshSpam/FixDoshSpam.uc
+++ b/sources/FixDoshSpam/FixDoshSpam.uc
@ -0,0 +1,253 @@
 /**
 *      This feature addressed two dosh-related issues:
 *      1.  Crashing servers by spamming 'CashPickup' actors with 'TossCash';
 *      2.  Breaking collision detection logic by stacking large amount of
 *      'CashPickup' actors in one place, which allows one to either
 *      reach unintended locations or even instantly kill zeds.
 *
 *      It fixes them by limiting speed, with which dosh can spawn, and
 *  allowing this limit to decrease when there's already too much dosh
 *  present on the map.
 *      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 FixDoshSpam extends Feature
    config(AcediaFixes);
 /**
 *      First, we limit amount of dosh that can be spawned simultaneously.
 *  The simplest method is to place a cooldown on spawning 'CashPickup' actors,
 *  i.e. after spawning one 'CashPickup' we'd completely prevent spawning
 *  any other instances of it for a fixed amount of time.
 *  However, that might allow a malicious spammer to block others from
 *  throwing dosh, - all he needs to do is to spam dosh at right time intervals.
 *      We'll resolve this issue by recording how many 'CashPickup' actors
 *  each player has spawned as their "contribution" and decay
 *  that value with time, only allowing to spawn new dosh after
 *  contribution decayed to zero. Speed of decay is derived from current dosh
 *  spawning speed limit and decreases with amount of players
 *  with non-zero contributions (since it means that they're throwing dosh).
 *      Second issue is player amassing a large amount of dosh in one point
 *  that leads to skipping collision checks, which then allows players to pass
 *  through level geometry or enter zeds' collisions, instantly killing them.
 *  Since dosh disappears on it's own, the easiest method to prevent that is to
 *  severely limit how much dosh players can throw per second,
 *  so that there's never enough dosh laying around to affect collision logic.
 *  The downside to such severe limitations is that game behaves less
 *  vanilla-like, where you could throw away streams of dosh.
 *  To solve that we'll first use a more generous limit on dosh players can
 *  throw per second, but will track how much dosh is currently present
 *  in a level and linearly decelerate speed, according to that amount.
 */
 //      Highest and lowest speed with which players can throw dosh wads.
 //  It'll be evenly spread between all players.
 //  For example, if speed is set to 6 and only one player will be spamming dosh,
 //  - he'll be able to throw 6 wads of dosh per second;
 //  but if all 6 players are spamming it, - each will throw only 1 per second.
 //      NOTE: these speed values can be exceeded, since a player is guaranteed
 //  to be able to throw at least one wad of dosh, if he didn't do so in awhile.
 //      NOTE #2: if maximum value is less than minimum one,
 //  the lowest (maximum one) will be used.
 var private config const float doshPerSecondLimitMax;
 var private config const float doshPerSecondLimitMin;
 //      Amount of dosh pickups on the map at which we must set dosh per second
 //  to 'doshPerSecondLimitMin'.
 //  We use 'doshPerSecondLimitMax' when there's no dosh on the map and
 //  scale linearly between them as it's amount grows.
 var private config const int criticalDoshAmount;
 //      To limit dosh spawning speed we need some measure of
 //  time passage between ticks.
 //  This variable stores last value seen by us as a good approximation.
 //      It's a real (not in-game) time.
 var private float lastTickDuration;
 //      This structure records how much a certain player has
 //  contributed to an overall dosh creation.
 struct DoshStreamPerPlayer
 {
    var PlayerController    player;
    //  Amount of dosh we remember this player creating, decays with time.
    var float               contribution;
 };
 var private array<DoshStreamPerPlayer> currentContributors;
 //  Wads of cash that are lying around on the map.
 var private array<CashPickup> wads;
 protected function OnEnabled()
 {
    local CashPickup nextCash;
    //      Find all wads of cash laying around on the map,
    //  so that we could accordingly limit the cash spam.
    foreach level.DynamicActors(class'KFMod.CashPickup', nextCash)
    {
        wads[wads.length] = nextCash;
    }
 }
 protected function OnDisabled()
 {
    wads.length                 = 0;
    currentContributors.length  = 0;
 }
 //  Did player with this controller contribute to the latest dosh generation?
 public final function bool IsContributor(PlayerController player)
 {
    return (GetContributorIndex(player) >= 0);
 }
 //  Did we already reach allowed limit of dosh per second?
 public final function bool IsDoshStreamOverLimit()
 {
    local int   i;
    local float overallContribution;
    overallContribution = 0.0;
    for (i = 0; i < currentContributors.length; i += 1)
    {
        overallContribution += currentContributors[i].contribution;
    }
    return (overallContribution > lastTickDuration * GetCurrentDPSLimit());
 }
 //  What is our current dosh per second limit?
 private final function float GetCurrentDPSLimit()
 {
    local float speedScale;
    if (doshPerSecondLimitMax < doshPerSecondLimitMin)
    {
        return doshPerSecondLimitMax;
    }
    speedScale = Float(wads.length) / Float(criticalDoshAmount);
    speedScale = FClamp(speedScale, 0.0, 1.0);
    //  At 0.0 scale (no dosh on the map)       - use max speed
    //  At 1.0 scale (critical dosh on the map) - use min speed
    return Lerp(speedScale, doshPerSecondLimitMax, doshPerSecondLimitMin);
 }
 //  Returns index of the contributor corresponding to the given controller.
 //  Returns '-1' if no connection correspond to the given controller.
 //  Returns '-1' if given controller is equal to 'none'.
 private final function int GetContributorIndex(PlayerController player)
 {
    local int i;
    if (player == none) return -1;
    for (i = 0; i < currentContributors.length; i += 1)
    {
        if (currentContributors[i].player == player)
        {
            return i;
        }
    }
    return -1;
 }
 //      Adds given cash to given player contribution record and
 //  registers that cash in our wads array.
 //  Does nothing if given cash was already registered.
 public final function AddContribution(PlayerController player, CashPickup cash)
 {
    local int                   i;
    local int                   playerIndex;
    local DoshStreamPerPlayer   newStreamRecord;
    //  Check if given dosh was already accounted for.
    for (i = 0; i < wads.length; i += 1)
    {
        if (cash == wads[i])
        {
            return;
        }
    }
    wads[wads.length] = cash;
    //  Add contribution to player
    playerIndex = GetContributorIndex(player);
    if (playerIndex >= 0)
    {
        currentContributors[playerIndex].contribution += 1.0;
        return;
    }
    newStreamRecord.player          = player;
    newStreamRecord.contribution    = 1.0;
    currentContributors[currentContributors.length] = newStreamRecord;
 }
 private final function ReducePlayerContributions(float trueTimePassed)
 {
    local int   i;
    local float streamReduction;
    streamReduction = trueTimePassed *
        (GetCurrentDPSLimit() / currentContributors.length);
    for (i = 0; i < currentContributors.length; i += 1)
    {
        currentContributors[i].contribution -= streamReduction;
    }
 }
 //  Clean out wads that disappeared or were picked up by players.
 private final function CleanWadsArray()
 {
    local int i;
    i = 0;
    while (i < wads.length)
    {
        if (wads[i] == none)
        {
            wads.Remove(i, 1);
        }
        else
        {
            i += 1;
        }
    }
 }
 //  Don't track players that no longer contribute to dosh generation.
 private final function RemoveNonContributors()
 {
    local int                           i;
    local array<DoshStreamPerPlayer>    updContributors;
    for (i = 0; i < currentContributors.length; i += 1)
    {
        //      We want to keep on record even players that quit,
        //  since their contribution still must be accounted for.
        if (currentContributors[i].contribution <= 0.0) continue;
        updContributors[updContributors.length] = currentContributors[i];
    }
    currentContributors = updContributors;
 }
 event Tick(float delta)
 {
    local float trueTimePassed;
    trueTimePassed = delta * (1.1 / level.timeDilation);
    CleanWadsArray();
    ReducePlayerContributions(trueTimePassed);
    RemoveNonContributors();
    lastTickDuration = trueTimePassed;
 }
 defaultproperties
 {
    doshPerSecondLimitMax   = 50
    doshPerSecondLimitMin   = 5
    criticalDoshAmount      = 25
    //  Listeners
    requiredListeners(0) = class'MutatorListener_FixDoshSpam'
 }
--- a/sources/FixDoshSpam/MutatorListener_FixDoshSpam.uc
+++ b/sources/FixDoshSpam/MutatorListener_FixDoshSpam.uc
@ -0,0 +1,51 @@
 /**
 *      Overloaded mutator events listener to catch and, possibly,
 *  prevent spawning dosh actors.
 *      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 MutatorListener_FixDoshSpam extends MutatorListenerBase
    abstract;
 static function bool CheckReplacement(Actor other, out byte isSuperRelevant)
 {
    local FixDoshSpam       doshFix;
    local PlayerController  player;
    if (other.class != class'CashPickup')   return true;
    //      This means this dosh wasn't spawned in 'TossCash' of 'KFPawn',
    //  so it isn't related to the exploit we're trying to fix.
    if (other.instigator == none)           return true;
    doshFix = FixDoshSpam(class'FixDoshSpam'.static.GetInstance());
    if (doshFix == none)                    return true;
    //      We only want to prevent spawning cash if we're already over
    //  the limit and the one trying to throw this cash contributed to it.
    //  We allow other players to throw at least one wad of cash.
    player = PlayerController(other.instigator.controller);
    if (doshFix.IsDoshStreamOverLimit() && doshFix.IsContributor(player))
    {
        return false;
    }
    //  If we do spawn cash - record this contribution.
    doshFix.AddContribution(player, CashPickup(other));
    return true;
 }
 defaultproperties
 {
    relatedEvents = class'MutatorEvents'
 }
--- a/sources/FixDualiesCost/DualiesCostRule.uc
+++ b/sources/FixDualiesCost/DualiesCostRule.uc
@ -0,0 +1,45 @@
 /**
 *      This rule detects any pickup events to allow us to
 *	properly record and/or fix pistols' prices.
 *      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 DualiesCostRule extends GameRules;
 function bool OverridePickupQuery
 (
 	Pawn other,
 	Pickup item,
 	out byte allowPickup
 )
 {
 	local KFWeaponPickup weaponPickup;
 	local FixDualiesCost dualiesCostFix;
 	weaponPickup = KFWeaponPickup(item);
 	dualiesCostFix = FixDualiesCost(class'FixDualiesCost'.static.GetInstance());
 	if (weaponPickup != none && dualiesCostFix != none)
 	{
 		dualiesCostFix.ApplyPendingValues();
 		dualiesCostFix.StoreSinglePistolValues();
 		dualiesCostFix.SetNextSellValue(weaponPickup.sellValue);
 	}
 	return super.OverridePickupQuery(other, item, allowPickup);
 }
 defaultproperties
 {
 }
--- a/sources/FixDualiesCost/FixDualiesCost.uc
+++ b/sources/FixDualiesCost/FixDualiesCost.uc
@ -0,0 +1,455 @@
 /**
 *      This feature fixes several issues related to the selling price of both
 *  single and dual pistols, all originating from the existence of dual weapons.
 *  Most notable issue is the ability to "print" money by buying and
 *  selling pistols in a certain way.
 *
 *      It fixes all of the issues by manually setting pistols'
 *  'SellValue' variables to proper values.
 *      Fix only works with vanilla pistols, as it's unpredictable what
 *  custom ones can do and they can handle these issues on their own
 *  in a better way.
 *      Copyright 2020 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 FixDualiesCost extends Feature
    config(AcediaFixes);
 /**
 *      Issues with pistols' cost may look varied and surface in
 *  a plethora of ways, but all of them originate from the two main errors
 *  in vanilla's code:
 *      1. If you have a pistol in your inventory at the time when you
 *  buy/pickup another one - the sell value of resulting dualies is
 *  incorrectly set to the sell value of the second pistol;
 *      2. When player has dual pistols and drops one on the floor, -
 *  the sell value for the one left with the player isn't set.
 *      All weapons in Killing Floor get sell value assigned to them
 *  (appropriately, in a 'SellValue' variable). This is to ensure that the sell
 *  price is set the moment players buys the gun. Otherwise, due to ridiculous
 *  perked discounts, you'd be able to buy a pistol at 30% price
 *  as sharpshooter, but sell at 75% of a price as any other perk,
 *  resulting in 45% of pure profit.
 *      Unfortunately, that's exactly what happens when 'SellValue' isn't set
 *  (left as it's default value of '-1'): sell value of such weapons is
 *  determined only at the moment of sale and depends on the perk of the seller,
 *  allowing for possible exploits.
 *
 *      These issues are fixed by directly assigning
 *  proper values to 'SellValue'. To do that we need to detect when player
 *  buys/sells/drops/picks up weapons, which we accomplish by catching
 *  'CheckReplacement' event for weapon instances. This approach has two issues.
 *      One is that, if vanilla's code sets an incorrect sell value, -
 *  it's doing it after weapon is spawned and, therefore,
 *  after 'CheckReplacement' call, so we have, instead, to remember to do
 *  it later, as early as possible
 *  (either the next tick or before another operation with weapons).
 *      Another issue is that when you have a pistol and pick up a pistol of
 *  the same type, - at the moment dualies instance is spawned,
 *  the original pistol in player's inventory is gone and we can't use
 *  it's sell value to calculate new value of dual pistols.
 *  This problem is solved by separately recording the value for every
 *  single pistol every tick.
 *  However, if pistol pickups are placed close enough together on the map,
 *  player can start touching them (which triggers a pickup) at the same time,
 *  picking them both in a single tick. This leaves us no room to record
 *  the value of a single pistol players picks up first.
 *  To get it we use game rules to catch 'OverridePickupQuery' event that's
 *  called before the first one gets destroyed,
 *  but after it's sell value was already set.
 *      Last issue is that when player picks up a second pistol - we don't know
 *  it's sell value and, therefore, can't calculate value of dual pistols.
 *  This is resolved by recording that value directly from a pickup,
 *  in abovementioned function 'OverridePickupQuery'.
 *      NOTE: 9mm is an exception due to the fact that you always have at least
 *  one and the last one can't be sold. We'll deal with it by setting
 *  the following rule: sell value of the un-droppable pistol is always 0
 *  and the value of a pair of 9mms is the value of the single droppable pistol.
 */
 //      Some issues involve possible decrease in pistols' price and
 //  don't lead to exploit, but are still bugs and require fixing.
 //      If you have a Deagle in your inventory and then get another one
 //  (by either buying or picking it off the ground) - the price of resulting
 //  dual pistols will be set to the price of the last deagle,
 //  like the first one wasn't worth anything at all.
 //  In particular this means that (prices are off-perk for more clarity):
 //      1. If you buy dual deagles (-1000 do$h) and then sell them at 75% of
 //      the cost (+750 do$h), you lose 250 do$h;
 //      2. If you first buy a deagle (-500 do$h), then buy
 //      the second one (-500 do$h) and then sell them, you'll only get
 //      75% of the cost of 1 deagle (+375 do$h), now losing 625 do$h;
 //      3. So if you already have bought a deagle (-500 do$h),
 //      you can get a more expensive weapon by doing a stupid thing
 //      and first selling your Deagle (+375 do$h),
 //      then buying dual deagles (-1000 do$h).
 //      If you sell them after that, you'll gain 75% of the cost of
 //      dual deagles (+750 do$h), leaving you with losing only 375 do$h.
 //  Of course, situations described above are only relevant if you're planning
 //  to sell your weapons at some point and most people won't even notice it.
 //  But such an oversight still shouldn't exist in a game and we fix it by
 //  setting sell value of dualies as a sum of values of each pistol.
 //      Yet, fixing this issue leads to players having more expensive
 //  (while fairly priced) weapons than on vanilla, technically making
 //  the game easier. And some people might object to having that in
 //  a whitelisted bug-fixing feature.
 //      These people are, without a question, complete degenerates.
 //      But making mods for only non-mentally challenged isn't inclusive.
 //      So we add this option.
 //      Set it to 'false' if you only want to fix ammo printing
 //  and leave the rest of the bullshit as-is.
 var private config const bool allowSellValueIncrease;
 //  Describe all the possible pairs of dual pistols in a vanilla game.
 struct DualiesPair
 {
    var class<KFWeapon> single;
    var class<KFWeapon> dual;
 };
 var private const array<DualiesPair> dualiesClasses;
 //  Describe sell values that need to be applied at earliest later point.
 struct WeaponValuePair
 {
    var KFWeapon        weapon;
    var float           value;
 };
 var private const array<WeaponValuePair> pendingValues;
 //  Describe sell values of all currently existing single pistols.
 struct WeaponDataRecord
 {
    var KFWeapon        reference;
    var class<KFWeapon> class;
    var float           value;
    //      The whole point of this structure is to remember value of a weapon
    //  after it's destroyed. Since 'reference' will become 'none' by then,
    //  we will use the 'owner' reference to identify the weapon.
    var Pawn            owner;
 };
 var private const array<WeaponDataRecord> storedValues;
 //  Sell value of the last seen pickup in 'OverridePickupQuery'
 var private int nextSellValue;
 protected function OnEnabled()
 {
    local KFWeapon nextWeapon;
    //  Find all frags, that spawned when this fix wasn't running.
    foreach level.DynamicActors(class'KFMod.KFWeapon', nextWeapon)
    {
        RegisterSinglePistol(nextWeapon, false);
    }
    level.game.AddGameModifier(Spawn(class'DualiesCostRule'));
 }
 protected function OnDisabled()
 {
    local GameRules         rulesIter;
    local DualiesCostRule   ruleToDestroy;
    //  Check first rule
    if (level.game.gameRulesModifiers == none) return;
    ruleToDestroy = DualiesCostRule(level.game.gameRulesModifiers);
    if (ruleToDestroy != none)
    {
        level.game.gameRulesModifiers = ruleToDestroy.nextGameRules;
        ruleToDestroy.Destroy();
        return;
    }
    //  Check rest of the rules
    rulesIter = level.game.gameRulesModifiers;
    while (rulesIter != none)
    {
        ruleToDestroy = DualiesCostRule(rulesIter.nextGameRules);
        if (ruleToDestroy != none)
        {
            rulesIter.nextGameRules = ruleToDestroy.nextGameRules;
            ruleToDestroy.Destroy();
        }
        rulesIter = rulesIter.nextGameRules;
    }
 }
 public final function SetNextSellValue(int newValue)
 {
    nextSellValue = newValue;
 }
 //  Finds a weapon of a given class in given 'Pawn' 's inventory.
 //  Returns 'none' if weapon isn't there.
 private final function KFWeapon GetWeaponOfClass
 (
    Pawn            playerPawn,
    class<KFWeapon> weaponClass
 )
 {
    local Inventory invIter;
    if (playerPawn == none) return none;
    invIter = playerPawn.inventory;
    while (invIter != none)
    {
        if (invIter.class == weaponClass)
        {
            return KFWeapon(invIter);
        }
        invIter = invIter.inventory;
    }
    return none;
 }
 //      Gets weapon index in our record of dual pistol classes.
 //      Second variable determines whether we're searching for single
 //  or dual variant:
 //      ~ 'true'    - searching for single
 //      ~ 'false'   - for dual
 //      Returns '-1' if weapon isn't found
 //  (dual MK23 won't be found as a single weapon).
 private final function int GetIndexAs(KFWeapon weapon, bool asSingle)
 {
    local int i;
    if (weapon == none) return -1;
    for (i = 0; i < dualiesClasses.length; i += 1)
    {
        if (asSingle && dualiesClasses[i].single == weapon.class)
        {
            return i;
        }
        if (!asSingle && dualiesClasses[i].dual == weapon.class)
        {
            return i;
        }
    }
    return -1;
 }
 //      Calculates full cost of a weapon with a discount,
 //  dependent on it's instigator's perk.
 private final function float GetFullCost(KFWeapon weapon)
 {
    local float                     cost;
    local class<KFWeaponPickup>     pickupClass;
    local KFPlayerReplicationInfo   instigatorRI;
    if (weapon == none)             return 0.0;
    pickupClass = class<KFWeaponPickup>(weapon.default.pickupClass);
    if (pickupClass == none)        return 0.0;
    cost = pickupClass.default.cost;
    if (weapon.instigator != none)
    {
        instigatorRI =
            KFPlayerReplicationInfo(weapon.instigator.playerReplicationInfo);
    }
    if (instigatorRI != none && instigatorRI.clientVeteranSkill != none)
    {
        cost *= instigatorRI.clientVeteranSkill.static
            .GetCostScaling(instigatorRI, pickupClass);
    }
    return cost;
 }
 //  If passed weapon is a pistol - we start tracking it's value;
 //  Otherwise - do nothing.
 public final function RegisterSinglePistol
 (
    KFWeapon singlePistol,
    bool justSpawned
 )
 {
    local WeaponDataRecord newRecord;
    if (singlePistol == none)               return;
    if (GetIndexAs(singlePistol, true) < 0) return;
    newRecord.reference = singlePistol;
    newRecord.class     = singlePistol.class;
    newRecord.owner     = singlePistol.instigator;
    if (justSpawned)
    {
        newRecord.value = nextSellValue;
    }
    else
    {
        newRecord.value = singlePistol.sellValue;
    }
    storedValues[storedValues.length] = newRecord;
 }
 //  Fixes sell value after player throws one pistol out of a pair.
 public final function FixCostAfterThrow(KFWeapon singlePistol)
 {
    local int       index;
    local KFWeapon  dualPistols;
    if (singlePistol == none)   return;
    index = GetIndexAs(singlePistol, true);
    if (index < 0)              return;
    dualPistols = GetWeaponOfClass( singlePistol.instigator,
                                    dualiesClasses[index].dual);
    if (dualPistols == none)    return;
    //      Sell value recorded into 'dualPistols' will end up as a value of
    //  a dropped pickup.
    //      Sell value of 'singlePistol' will be the value for the pistol,
    //  left in player's hands.
    if (dualPistols.class == class'KFMod.Single')
    {
        //  9mm is an exception.
        //  Remaining weapon costs nothing.
        singlePistol.sellValue = 0;
        //      We don't change the sell value of the dropped weapon,
        //  as it's default behavior to transfer full value of a pair to it.
        return;
    }
    //  For other pistols - divide the value.
    singlePistol.sellValue = dualPistols.sellValue / 2;
    dualPistols.sellValue = singlePistol.sellValue;
 }
 //      Fixes sell value after buying a pair of dual pistols,
 //  if player already had a single version.
 public final function FixCostAfterBuying(KFWeapon dualPistols)
 {
    local int               index;
    local KFWeapon          singlePistol;
    local WeaponValuePair   newPendingValue;
    if (dualPistols == none)    return;
    index = GetIndexAs(dualPistols, false);
    if (index < 0)              return;
    singlePistol = GetWeaponOfClass(dualPistols.instigator,
                                    dualiesClasses[index].single);
    if (singlePistol == none)   return;
    //  'singlePistol' will get destroyed, so it's sell value is irrelevant.
    //      'dualPistols' will be the new pair of pistols, but it's value will
    //  get overwritten by vanilla's code after this function.
    //  So we must add it to pending values to be changed later.
    newPendingValue.weapon  = dualPistols;
    if (dualPistols.class == class'KFMod.Dualies')
    {
        //  9mm is an exception.
        //      The value of pair of 9mms is the price of additional pistol,
        //  that defined as a price of a pair in game.
        newPendingValue.value = GetFullCost(dualPistols) * 0.75;
    }
    else
    {
        //      Otherwise price of a pair is the price of two pistols:
        //  'singlePistol.sellValue'    - the one we had
        //  '(FullCost / 2) * 0.75'     - and the one we bought
        newPendingValue.value = singlePistol.sellValue
            + (GetFullCost(dualPistols) / 2) * 0.75;
    }
    pendingValues[pendingValues.length] = newPendingValue;
 }
 //      Fixes sell value after player picks up a single pistol,
 //  while already having one of the same time in his inventory.
 public final function FixCostAfterPickUp(KFWeapon dualPistols)
 {
    local int               i;
    local int               index;
    local KFWeapon          singlePistol;
    local WeaponValuePair   newPendingValue;
    if (dualPistols == none)        return;
    //  In both cases of:
    //      1. buying dualies, without having a single pistol of
    //      corresponding type;
    //      2. picking up a second pistol, while having another one;
    //  by the time of 'CheckReplacement' (and, therefore, this function)
    //  is called, there's no longer any single pistol in player's inventory
    //  (in first case it never was there, in second - it got destroyed).
    //      To distinguish between those possibilities we can check the owner of
    //  the spawned weapon, since it's only set to instigator at the time of
    //  'CheckReplacement' when player picks up a weapon.
    //      So we require that owner exists.
    if (dualPistols.owner == none)  return;
    index = GetIndexAs(dualPistols, false);
    if (index < 0)                  return;
    singlePistol = GetWeaponOfClass(dualPistols.instigator,
                                    dualiesClasses[index].single);
    if (singlePistol != none)       return;
    if (nextSellValue == -1)
    {
        nextSellValue = GetFullCost(dualPistols) * 0.75;
    }
    for (i = 0; i < storedValues.length; i += 1)
    {
        if (storedValues[i].reference != none)                      continue;
        if (storedValues[i].class != dualiesClasses[index].single)  continue;
        if (storedValues[i].owner != dualPistols.instigator)        continue;
        newPendingValue.weapon  = dualPistols;
        newPendingValue.value   = storedValues[i].value + nextSellValue;
        pendingValues[pendingValues.length] = newPendingValue;
        break;
    }
 }
 public final function ApplyPendingValues()
 {
    local int i;
    for (i = 0; i < pendingValues.length; i += 1)
    {
        if (pendingValues[i].weapon == none)    continue;
        //      Our fixes can only increase the correct ('!= -1')
        //  sell value of weapons, so if we only need to change sell value
        //  if we're allowed to increase it or it's incorrect.
        if (allowSellValueIncrease || pendingValues[i].weapon.sellValue == -1)
        {
            pendingValues[i].weapon.sellValue = pendingValues[i].value;
        }
    }
    pendingValues.length = 0;
 }
 public final function StoreSinglePistolValues()
 {
    local int i;
    i = 0;
    while (i < storedValues.length)
    {
        if (storedValues[i].reference == none)
        {
            storedValues.Remove(i, 1);
            continue;
        }
        storedValues[i].owner = storedValues[i].reference.instigator;
        storedValues[i].value = storedValues[i].reference.sellValue;
        i += 1;
    }
 }
 event Tick(float delta)
 {
    ApplyPendingValues();
    StoreSinglePistolValues();
 }
 defaultproperties
 {
    allowSellValueIncrease = true
    //  Inner variables
    dualiesClasses(0)=(single=class'KFMod.Single',dual=class'KFMod.Dualies')
    dualiesClasses(1)=(single=class'KFMod.Magnum44Pistol',dual=class'KFMod.Dual44Magnum')
    dualiesClasses(2)=(single=class'KFMod.MK23Pistol',dual=class'KFMod.DualMK23Pistol')
    dualiesClasses(3)=(single=class'KFMod.Deagle',dual=class'KFMod.DualDeagle')
    dualiesClasses(4)=(single=class'KFMod.GoldenDeagle',dual=class'KFMod.GoldenDualDeagle')
    dualiesClasses(5)=(single=class'KFMod.FlareRevolver',dual=class'KFMod.DualFlareRevolver')
    //  Listeners
    requiredListeners(0) = class'MutatorListener_FixDualiesCost'
 }
--- a/sources/FixDualiesCost/MutatorListener_FixDualiesCost.uc
+++ b/sources/FixDualiesCost/MutatorListener_FixDualiesCost.uc
@ -0,0 +1,43 @@
 /**
 *      Overloaded mutator events listener to catch when pistol-type weapons
 *  (single or dual) are spawned and to correct their price.
 *      Copyright 2020 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 MutatorListener_FixDualiesCost extends MutatorListenerBase
    abstract;
 static function bool CheckReplacement(Actor other, out byte isSuperRelevant)
 {
    local KFWeapon          weapon;
    local FixDualiesCost    dualiesCostFix;
    weapon = KFWeapon(other);
    if (weapon == none)         return true;
    dualiesCostFix = FixDualiesCost(class'FixDualiesCost'.static.GetInstance());
    if (dualiesCostFix == none) return true;
    dualiesCostFix.RegisterSinglePistol(weapon, true);
    dualiesCostFix.FixCostAfterThrow(weapon);
    dualiesCostFix.FixCostAfterBuying(weapon);
    dualiesCostFix.FixCostAfterPickUp(weapon);
    return true;
 }
 defaultproperties
 {
    relatedEvents = class'MutatorEvents'
 }
--- a/sources/FixFFHack/FFHackRule.uc
+++ b/sources/FixFFHack/FFHackRule.uc
@ -0,0 +1,74 @@
 /**
 *      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
 {
 }
--- a/sources/FixFFHack/FixFFHack.uc
+++ b/sources/FixFFHack/FixFFHack.uc
@ -0,0 +1,153 @@
 /**
 *      This feature fixes a bug that can allow players to bypass server's
 *  friendly fire limitations and teamkill.
 *  Usual fixes apply friendly fire scale to suspicious damage themselves, which
 *  also disables some of the environmental damage.
 *  In order to avoid that, this fix allows server owner to define precisely
 *  to what damage types to apply the friendly fire scaling.
 *  It should be all damage types related to projectiles.
 *      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 FixFFHack extends Feature
    config(AcediaFixes);
 /**
 *      It's possible to bypass friendly fire damage scaling and always deal
 *  full damage to other players, if one were to either leave the server or
 *  spectate right after shooting a projectile. We use game rules to catch
 *  such occurrences and apply friendly fire scaling to weapons,
 *  specified by server admins.
 *      To specify required subset of weapons, one must first
 *  chose a general rule (scale by default / don't scale by default) and then,
 *  optionally, add exceptions to it.
 *      Choosing 'scaleByDefault == true' as a general rule will make this fix
 *  behave in the similar way to 'KFExplosiveFix' by mutant and will disable
 *  some environmental sources of damage on some maps. One can then add relevant
 *  damage classes as exceptions to fix that downside, but making an extensive
 *  list of such sources might prove problematic.
 *      On the other hand, setting 'scaleByDefault == false' will allow to get
 *  rid of team-killing exploits by simply adding damage types of all
 *  projectile weapons, used on a server. This fix comes with such filled-in
 *  list of all vanilla projectile classes.
 */
 //      Defines a general rule for choosing whether or not to apply
 //  friendly fire scaling.
 //  This can be overwritten by exceptions ('alwaysScale' or 'neverScale').
 //  Enabling scaling by default without any exceptions in 'neverScale' will
 //  make this fix behave almost identically to Mutant's 'Explosives Fix Mutator'.
 var private config const bool                       scaleByDefault;
 //  Damage types, for which we should always reapply friendly fire scaling.
 var private config const array< class<DamageType> > alwaysScale;
 //  Damage types, for which we should never reapply friendly fire scaling.
 var private config const array< class<DamageType> > neverScale;
 protected function OnEnabled()
 {
    level.game.AddGameModifier(Spawn(class'FFHackRule'));
 }
 protected function OnDisabled()
 {
    local GameRules     rulesIter;
    local FFHackRule    ruleToDestroy;
    //  Check first rule
    if (level.game.gameRulesModifiers == none) return;
    ruleToDestroy = FFHackRule(level.game.gameRulesModifiers);
    if (ruleToDestroy != none)
    {
        level.game.gameRulesModifiers = ruleToDestroy.nextGameRules;
        ruleToDestroy.Destroy();
        return;
    }
    //  Check rest of the rules
    rulesIter = level.game.gameRulesModifiers;
    while (rulesIter != none)
    {
        ruleToDestroy = FFHackRule(rulesIter.nextGameRules);
        if (ruleToDestroy != none)
        {
            rulesIter.nextGameRules = ruleToDestroy.nextGameRules;
            ruleToDestroy.Destroy();
        }
        rulesIter = rulesIter.nextGameRules;
    }
 }
 //  Checks general rule and exception list
 public final function bool ShouldScaleDamage(class<DamageType> damageType)
 {
    local int                           i;
    local array< class<DamageType> >    exceptions;
    if (damageType == none) return false;
    if (scaleByDefault)
        exceptions = neverScale;
    else
        exceptions = alwaysScale;
    for (i = 0; i < exceptions.length; i += 1)
    {
        if (exceptions[i] == damageType)
        {
            return (!scaleByDefault);
        }
    }
    return scaleByDefault;
 }
 defaultproperties
 {
    scaleByDefault  = false
    //  Vanilla damage types for projectiles
    alwaysScale(0)  = class'KFMod.DamTypeCrossbuzzsawHeadShot'
    alwaysScale(1)  = class'KFMod.DamTypeCrossbuzzsaw'
    alwaysScale(2)  = class'KFMod.DamTypeFrag'
    alwaysScale(3)  = class'KFMod.DamTypePipeBomb'
    alwaysScale(4)  = class'KFMod.DamTypeM203Grenade'
    alwaysScale(5)  = class'KFMod.DamTypeM79Grenade'
    alwaysScale(6)  = class'KFMod.DamTypeM79GrenadeImpact'
    alwaysScale(7)  = class'KFMod.DamTypeM32Grenade'
    alwaysScale(8)  = class'KFMod.DamTypeLAW'
    alwaysScale(9)  = class'KFMod.DamTypeLawRocketImpact'
    alwaysScale(10) = class'KFMod.DamTypeFlameNade'
    alwaysScale(11) = class'KFMod.DamTypeFlareRevolver'
    alwaysScale(12) = class'KFMod.DamTypeFlareProjectileImpact'
    alwaysScale(13) = class'KFMod.DamTypeBurned'
    alwaysScale(14) = class'KFMod.DamTypeTrenchgun'
    alwaysScale(15) = class'KFMod.DamTypeHuskGun'
    alwaysScale(16) = class'KFMod.DamTypeCrossbow'
    alwaysScale(17) = class'KFMod.DamTypeCrossbowHeadShot'
    alwaysScale(18) = class'KFMod.DamTypeM99SniperRifle'
    alwaysScale(19) = class'KFMod.DamTypeM99HeadShot'
    alwaysScale(20) = class'KFMod.DamTypeShotgun'
    alwaysScale(21) = class'KFMod.DamTypeNailGun'
    alwaysScale(22) = class'KFMod.DamTypeDBShotgun'
    alwaysScale(23) = class'KFMod.DamTypeKSGShotgun'
    alwaysScale(24) = class'KFMod.DamTypeBenelli'
    alwaysScale(25) = class'KFMod.DamTypeSPGrenade'
    alwaysScale(26) = class'KFMod.DamTypeSPGrenadeImpact'
    alwaysScale(27) = class'KFMod.DamTypeSeekerSixRocket'
    alwaysScale(28) = class'KFMod.DamTypeSeekerRocketImpact'
    alwaysScale(29) = class'KFMod.DamTypeSealSquealExplosion'
    alwaysScale(30) = class'KFMod.DamTypeRocketImpact'
    alwaysScale(31) = class'KFMod.DamTypeBlowerThrower'
    alwaysScale(32) = class'KFMod.DamTypeSPShotgun'
    alwaysScale(33) = class'KFMod.DamTypeZEDGun'
    alwaysScale(34) = class'KFMod.DamTypeZEDGunMKII'
 }
--- a/sources/FixInfiniteNades/FixInfiniteNades.uc
+++ b/sources/FixInfiniteNades/FixInfiniteNades.uc
@ -0,0 +1,234 @@
 /**
 *      This feature fixes a vulnerability in a code of 'Frag' that can allow
 *  player to throw grenades even when he no longer has any.
 *  There's also no cooldowns on the throw, which can lead to a server crash.
 *      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 FixInfiniteNades extends Feature
    config(AcediaFixes);
 /**
 *      It is possible to call 'ServerThrow' function from client,
 *  forcing it to get executed on a server. This function consumes the grenade
 *  ammo and spawns a nade, but it doesn't check if player had any grenade ammo
 *  in the first place, allowing you him to throw however many grenades
 *  he wants. Moreover, unlike a regular throwing method, calling this function
 *  allows to spawn many grenades without any delay,
 *  which can lead to a server crash.
 *
 *      This fix tracks every instance of 'Frag' weapon that's responsible for
 *  throwing grenades and records how much ammo they have have.
 *  This is necessary, because whatever means we use, when we get a say in
 *  preventing grenade from spawning the ammo was already reduced.
 *  This means that we can't distinguished between a player abusing a bug by
 *  throwing grenade when he doesn't have necessary ammo and player throwing
 *  his last nade, as in both cases current ammo visible to us will be 0.
 *  Then, before every nade throw, it checks if player has enough ammo and
 *  blocks grenade from spawning if he doesn't.
 *      We change a 'FireModeClass[0]' from 'FragFire' to 'FixedFragFire' and
 *  only call 'super.DoFireEffect()' if we decide spawning grenade
 *  should be allowed. The side effect is a change in server's 'FireModeClass'.
 */
 //      Setting this flag to 'true' will allow to throw grenades by calling
 //  'ServerThrow' directly, as long as player has necessary ammo.
 //  This can allow some players to throw grenades much quicker than intended,
 //  therefore it's suggested to keep this flag set to 'false'.
 var private config const bool ignoreTossFlags;
 //  Records how much ammo given frag grenade ('Frag') has.
 struct FragAmmoRecord
 {
    var public Frag fragReference;
    var public int  amount;
 };
 var private array<FragAmmoRecord> ammoRecords;
 protected function OnEnabled()
 {
    local Frag nextFrag;
    //  Find all frags, that spawned when this fix wasn't running.
    foreach level.DynamicActors(class'KFMod.Frag', nextFrag)
    {
        RegisterFrag(nextFrag);
    }
    RecreateFrags();
 }
 protected function OnDisabled()
 {
    RecreateFrags();
    ammoRecords.length = 0;
 }
 //  Returns index of the connection corresponding to the given controller.
 //  Returns '-1' if no connection correspond to the given controller.
 //  Returns '-1' if given controller is equal to 'none'.
 private final function int GetAmmoIndex(Frag fragToCheck)
 {
    local int i;
    if (fragToCheck == none) return -1;
    for (i = 0; i < ammoRecords.length; i += 1)
    {
        if (ammoRecords[i].fragReference == fragToCheck)
        {
            return i;
        }
    }
    return -1;
 }
 //  Recreates all the 'Frag' actors, to change their fire mode mid-game.
 private final function RecreateFrags()
 {
    local int                   i;
    local float                 maxAmmo, currentAmmo;
    local Frag                  newFrag;
    local Pawn                  fragOwner;
    local array<FragAmmoRecord> oldRecords;
    oldRecords = ammoRecords;
    for (i = 0; i < oldRecords.length; i += 1)
    {
        //  Check if we even need to recreate that instance of 'Frag'
        if (oldRecords[i].fragReference == none) continue;
        fragOwner = oldRecords[i].fragReference.instigator;
        if (fragOwner == none) continue;
        //  Recreate
        oldRecords[i].fragReference.Destroy();
        fragOwner.CreateInventory("KFMod.Frag");
        newFrag = GetPawnFrag(fragOwner);
        //  Restore ammo amount
        if (newFrag != none)
        {
            newFrag.GetAmmoCount(maxAmmo, currentAmmo);
            newFrag.AddAmmo(oldRecords[i].amount - Int(currentAmmo), 0);
        }
    }
 }
 // Utility function to help find a 'Frag' instance in a given pawn's inventory.
 static private final function Frag GetPawnFrag(Pawn pawnWithFrag)
 {
    local Frag      foundFrag;
    local Inventory invIter;
    if (pawnWithFrag == none) return none;
    invIter = pawnWithFrag.inventory;
    while (invIter != none)
    {
        foundFrag = Frag(invIter);
        if (foundFrag != none)
        {
            return foundFrag;
        }
        invIter = invIter.inventory;
    }
    return none;
 }
 //  Utility function for extracting current ammo amount from a frag class.
 private final function int GetFragAmmo(Frag fragReference)
 {
    local float maxAmmo;
    local float currentAmmo;
    if (fragReference == none) return 0;
    fragReference.GetAmmoCount(maxAmmo, currentAmmo);
    return Int(currentAmmo);
 }
 //  Attempts to add new 'Frag' instance to our records.
 public final function RegisterFrag(Frag newFrag)
 {
    local int               index;
    local FragAmmoRecord    newRecord;
    index = GetAmmoIndex(newFrag);
    if (index >= 0) return;
    newRecord.fragReference = newFrag;
    newRecord.amount = GetFragAmmo(newFrag);
    ammoRecords[ammoRecords.length] = newRecord;
 }
 //      This function tells our fix that there was a nade throw and we should
 //  reduce current 'Frag' ammo in our records.
 //  Returns 'true' if we had ammo for that, and 'false' if we didn't.
 public final function bool RegisterNadeThrow(Frag relevantFrag)
 {
    if (CanThrowGrenade(relevantFrag))
    {
        ReduceGrenades(relevantFrag);
        return true;
    }
    return false;
 }
 //      Can we throw grenade according to our rules?
 //  A throw can be prevented if:
 //  - we think that player doesn't have necessary ammo;
 //  - Player isn't currently 'tossing' a nade,
 //  meaning it was a direct call of 'ServerThrow'.
 private final function bool CanThrowGrenade(Frag fragToCheck)
 {
    local int index;
    //  Nothing to check
    if (fragToCheck == none)            return false;
    //  No ammo
    index = GetAmmoIndex(fragToCheck);
    if (index < 0)                      return false;
    if (ammoRecords[index].amount <= 0) return false;
    //  Not tossing
    if (ignoreTossFlags)                                        return true;
    if (!fragToCheck.bTossActive || fragToCheck.bTossSpawned)   return false;
    return true;
 }
 //  Reduces recorded amount of ammo in our records for the given nade.
 private final function ReduceGrenades(Frag relevantFrag)
 {
    local int index;
    index = GetAmmoIndex(relevantFrag);
    if (index < 0) return;
    ammoRecords[index].amount -= 1;
 }
 event Tick(float delta)
 {
    local int i;
    //  Update our ammo records with current, correct data.
    i = 0;
    while (i < ammoRecords.length)
    {
        if (ammoRecords[i].fragReference != none)
        {
            ammoRecords[i].amount = GetFragAmmo(ammoRecords[i].fragReference);
            i += 1;
        }
        else
        {
            ammoRecords.Remove(i, 1);
        }
    }
 }
 defaultproperties
 {
    ignoreTossFlags = false
    //  Listeners
    requiredListeners(0) = class'MutatorListener_FixInfiniteNades'
 }
--- a/sources/FixInfiniteNades/FixedFragFire.uc
+++ b/sources/FixInfiniteNades/FixedFragFire.uc
@ -0,0 +1,36 @@
 /**
 *      A replacement for vanilla 'FragFire' fire class for 'Frag' weapon that
 *  adds additional ammo check in accordance to ammo records
 *  of 'FixInfiniteNades'.
 *      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 FixedFragFire extends KFMod.FragFire;
 function DoFireEffect()
 {
    local FixInfiniteNades nadeFix;
    nadeFix = FixInfiniteNades(class'FixInfiniteNades'.static.GetInstance());
    if (nadeFix == none || nadeFix.RegisterNadeThrow(Frag(weapon)))
    {
        super.DoFireEffect();
    }
 }
 defaultproperties
 {
 }
--- a/sources/FixInfiniteNades/MutatorListener_FixInfiniteNades.uc
+++ b/sources/FixInfiniteNades/MutatorListener_FixInfiniteNades.uc
@ -0,0 +1,44 @@
 /**
 *      Overloaded mutator events listener to catch
 *  new 'Frag' weapons and 'Nade' projectiles.
 *      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 MutatorListener_FixInfiniteNades extends MutatorListenerBase
    abstract;
 static function bool CheckReplacement(Actor other, out byte isSuperRelevant)
 {
    local Frag              relevantFrag;
    local FixInfiniteNades  nadeFix;
    nadeFix = FixInfiniteNades(class'FixInfiniteNades'.static.GetInstance());
    if (nadeFix == none) return true;
    //  Handle detecting new frag (weapons that allows to throw nades)
    relevantFrag = Frag(other);
    if (relevantFrag != none)
    {
        nadeFix.RegisterFrag(relevantFrag);
        relevantFrag.FireModeClass[0] = class'FixedFragFire';
        return true;
    }
    return true;
 }
 defaultproperties
 {
 }
--- a/sources/FixInventoryAbuse/FixInventoryAbuse.uc
+++ b/sources/FixInventoryAbuse/FixInventoryAbuse.uc
@ -0,0 +1,226 @@
 /**
 *      This feature addressed two inventory issues:
 *      1.  Players carrying amount of weapons that shouldn't be allowed by the
 *      weight limit.
 *      2.  Players carrying two variants of the same gun.
 *      For example carrying both M32 and camo M32.
 *      Single and dual version of the same weapon are also considered
 *      the same gun, so you can't carry both MK23 and dual MK23 or
 *      dual handcannons and golden handcannon.
 *
 *      It fixes them by doing repeated checks to find violations of those rules
 *      and destroys all droppable weapons of people that use this exploit.
 *      Copyright 2020 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 FixInventoryAbuse extends Feature
    config(AcediaFixes);
 //      How often (in seconds) should we do our inventory validations?
 //      We shouldn't really worry about performance, but there's also no need to
 //  do this check too often.
 var private config const float checkInterval;
 struct DualiesPair
 {
    var class<KFWeaponPickup>   single;
    var class<KFWeaponPickup>   dual;
 };
 //      For this fix to properly work, this array must contain an entry for
 //  every dual weapon in the game (like pistols, with single and dual versions).
 //  It's made configurable in case of custom dual weapons.
 var private config const array<DualiesPair> dualiesClasses;
 protected function OnEnabled()
 {
    local float actualInterval;
    actualInterval = checkInterval;
    if (actualInterval <= 0)
    {
        actualInterval = 0.25;
    }
    SetTimer(actualInterval, true);
 }
 protected function OnDisabled()
 {
    SetTimer(0.0f, false);
 }
 //  Did player with this controller contribute to the latest dosh generation?
 private final function bool IsWeightLimitViolated(KFHumanPawn playerPawn)
 {
    if (playerPawn == none) return false;
    return (playerPawn.currentWeight > playerPawn.maxCarryWeight);
 }
 //      Returns a root pickup class.
 //  For non-dual weapons, root class is defined as either:
 //      1. the first variant (reskin), if there are variants for that weapon;
 //      2. and as the class itself, if there are no variants.
 //  For dual weapons (all dual pistols) root class is defined as
 //  a root of their single version.
 //      This definition is useful because:
 //      ~ Vanilla game rules are such that player can only have two weapons
 //      in the inventory if they have different roots;
 //      ~ Root is easy to find.
 private final function class<KFWeaponPickup> GetRootPickupClass(KFWeapon weapon)
 {
    local int                   i;
    local class<KFWeaponPickup> root;
    if (weapon == none) return none;
    //  Start with a pickup of the given weapons
    root = class<KFWeaponPickup>(weapon.default.pickupClass);
    if (root == none) return none;
    //      In case it's a dual version - find corresponding single pickup class
    //  (it's root would be the same).
    for (i = 0; i < dualiesClasses.length; i += 1)
    {
        if (dualiesClasses[i].dual == root)
        {
            root = dualiesClasses[i].single;
            break;
        }
    }
    //      Take either first variant class or the class itself, -
    //  it's going to be root by definition.
    if (root.default.variantClasses.length > 0)
    {
        root = class<KFWeaponPickup>(root.default.variantClasses[0]);
    }
    return root;
 }
 //      Returns 'true' if passed pawn has two weapons that are just variants of
 //  each other (they have the same root, see 'GetRootPickupClass').
 private final function bool HasDuplicateGuns(KFHumanPawn playerPawn)
 {
    local int                       i, j;
    local Inventory                 inv;
    local KFWeapon                  nextWeapon;
    local class<KFWeaponPickup>     rootClass;
    local array< class<Pickup> >    rootList;
    if (playerPawn == none) return false;
    //  First find a root for every weapon in the pawn's inventory.
    for (inv = playerPawn.inventory; inv != none; inv = inv.inventory)
    {
        nextWeapon = KFWeapon(inv);
        if (nextWeapon == none)         continue;
        if (nextWeapon.bKFNeverThrow)   continue;
        rootClass = GetRootPickupClass(nextWeapon);
        if (rootClass != none)
        {
            rootList[rootList.length] = rootClass;
        }
    }
    //  Then just check obtained roots for duplicates.
    for (i = 0; i < rootList.length; i += 1)
    {
        for (j = i + 1; j < rootList.length; j += 1)
        {
            if (rootList[i] == rootList[j])
            {
                return true;
            }
        }
    }
    return false;
 }
 private final function Vector DropWeapon(KFWeapon weaponToDrop)
 {
    local Vector        x, y, z;
    local Vector        weaponVelocity;
    local Vector        dropLocation;
    local KFHumanPawn   playerPawn;
    if (weaponToDrop == none)   return Vect(0, 0, 0);
    playerPawn = KFHumanPawn(weaponToDrop.instigator);
    if (playerPawn == none)     return Vect(0, 0, 0);
    //  Calculations from 'PlayerController.ServerThrowWeapon'
    weaponVelocity = Vector(playerPawn.GetViewRotation());
    weaponVelocity *= (playerPawn.velocity dot weaponVelocity) + 150;
    weaponVelocity += Vect(0, 0, 100);
    //  Calculations from 'Pawn.TossWeapon'
    GetAxes(playerPawn.rotation, x, y, z);
    dropLocation = playerPawn.location + 0.8 * playerPawn.collisionRadius * x -
        0.5 * playerPawn.collisionRadius * y;
    //  Do the drop
    weaponToDrop.velocity = weaponVelocity;
    weaponToDrop.DropFrom(dropLocation);
 }
 //  Kill the gun devil!
 private final function DropEverything(KFHumanPawn playerPawn)
 {
    local int               i;
    local Inventory         inv;
    local KFWeapon          nextWeapon;
    local array<KFWeapon>   weaponList;
    if (playerPawn == none) return;
    //      Going through the linked list while removing items can be tricky,
    //  so just find all weapons first.
    for (inv = playerPawn.inventory; inv != none; inv = inv.inventory)
    {
        nextWeapon = KFWeapon(inv);
        if (nextWeapon == none)         continue;
        if (nextWeapon.bKFNeverThrow)   continue;
        weaponList[weaponList.length] = nextWeapon;
    }
    //  And destroy them later.
    for(i = 0; i < weaponList.length; i += 1)
    {
        DropWeapon(weaponList[i]);
    }
 }
 event Timer()
 {
    local int                                   i;
    local KFHumanPawn                           nextPawn;
    local ConnectionService                     service;
    local array<ConnectionService.Connection>   connections;
    service = ConnectionService(class'ConnectionService'.static.GetInstance());
    if (service == none) return;
    connections = service.GetActiveConnections();
    for (i = 0; i < connections.length; i += 1)
    {
        nextPawn = none;
        if (connections[i].controllerReference != none)
        {
            nextPawn = KFHumanPawn(connections[i].controllerReference.pawn);
        }
        if (IsWeightLimitViolated(nextPawn) || HasDuplicateGuns(nextPawn))
        {
            DropEverything(nextPawn);
        }
    }
 }
 defaultproperties
 {
    checkInterval = 0.25
    dualiesClasses(0)=(single=class'KFMod.SinglePickup',dual=class'KFMod.DualiesPickup')
    dualiesClasses(1)=(single=class'KFMod.Magnum44Pickup',dual=class'KFMod.Dual44MagnumPickup')
    dualiesClasses(2)=(single=class'KFMod.MK23Pickup',dual=class'KFMod.DualMK23Pickup')
    dualiesClasses(3)=(single=class'KFMod.DeaglePickup',dual=class'KFMod.DualDeaglePickup')
    dualiesClasses(4)=(single=class'KFMod.GoldenDeaglePickup',dual=class'KFMod.GoldenDualDeaglePickup')
    dualiesClasses(5)=(single=class'KFMod.FlareRevolverPickup',dual=class'KFMod.DualFlareRevolverPickup')
 }
--- a/sources/FixSpectatorCrash/BroadcastListener_FixSpectatorCrash.uc
+++ b/sources/FixSpectatorCrash/BroadcastListener_FixSpectatorCrash.uc
@ -0,0 +1,51 @@
 /**
 *      Overloaded broadcast events listener to catch the moment
 *  someone becomes alive player / spectator.
 *      Copyright 2020 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 BroadcastListener_FixSpectatorCrash extends BroadcastListenerBase
    abstract;
 var private const int becomeAlivePlayerID;
 var private const int becomeSpectatorID;
 static function bool HandleLocalized
 (
    Actor                               sender,
    BroadcastEvents.LocalizedMessage    message
 )
 {
    local FixSpectatorCrash specFix;
    local PlayerController  senderController;
    if (sender == none)                                         return true;
    if (sender.level == none || sender.level.game == none)      return true;
    if (message.class != sender.level.game.gameMessageClass)    return true;
    if (    message.id != default.becomeAlivePlayerID
        &&  message.id != default.becomeSpectatorID)            return true;
    specFix = FixSpectatorCrash(class'FixSpectatorCrash'.static.GetInstance());
    senderController = GetController(sender);
    specFix.NotifyStatusChange(senderController);
    return (!specFix.IsViolator(senderController));
 }
 defaultproperties
 {
    becomeAlivePlayerID = 1
    becomeSpectatorID   = 14
 }
--- a/sources/FixSpectatorCrash/FixSpectatorCrash.uc
+++ b/sources/FixSpectatorCrash/FixSpectatorCrash.uc
@ -0,0 +1,292 @@
 /**
 *      This feature attempts to prevent server crashes caused by someone
 *  quickly switching between being spectator and an active player.
 *
 *      We do so by disconnecting players who start switching way too fast
 *  (more than twice in a short amount of time) and temporarily faking a large
 *  amount of players on the server, to prevent such spam from affecting the server.
 *      Copyright 2020 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 FixSpectatorCrash extends Feature
    dependson(ConnectionService)
    config(AcediaFixes);
 /**
 *      We use broadcast events to track when someone is switching
 *  to active player or spectator and remember such people
 *  for a short time (cooldown), defined by ('spectatorChangeTimeout').
 *  If one of the player we've remembered tries to switch again,
 *  before the defined cooldown ran out, - we kick him
 *  by destroying his controller.
 *      One possible problem arises from the fact that controllers aren't
 *  immediately destroyed and instead initiate player disconnection, -
 *  exploiter might have enough time to cause a lag or even crash the server.
 *  We address this issue by temporarily blocking anyone from
 *  becoming active player (we do this by setting 'numPlayers' variable in
 *  killing floor's game info to a large value).
 *  After all malicious players have successfully disconnected, -
 *  we remove the block.
 */
 //      This fix will try to kick any player that switches between active player
 //  and cooldown faster than time (in seconds) in this value.
 //      NOTE: raising this value past default value of '0.25'
 //  won't actually improve crash prevention.
 var private config const float  spectatorChangeTimeout;
 //      [ADVANCED] Don't change this setting unless you know what you're doing.
 //      Allows you to turn off server blocking.
 //  Players that don't respect timeout will still be kicked.
 //      This might be needed if this fix conflicts with another mutator
 //  that also changes 'numPlayers'.
 //  However, it is necessary to block aggressive enough server crash attempts,
 //  but can cause compatibility issues with some mutators.
 //  It's highly preferred to rewrite such a mutator to be compatible.
 //      NOTE: it should be compatible with most faked players-type mutators,
 //  since this fix remembers the difference between amount of
 //  real players and 'numPlayers'.
 //  After unblocking, it sets 'numPlayers' to
 //  the current amount of real players + that difference.
 //  So 4 players + 3 (=7 numPlayers) after kicking 1 player becomes
 //  3 players + 3 (=6 numPlayers).
 var private config const bool   allowServerBlock;
 //      Stores remaining cooldown value before the next allowed
 //  spectator change per player.
 struct CooldownRecord
 {
    var PlayerController    player;
    var float               cooldown;
 };
 //  Currently active cooldowns
 var private array<CooldownRecord> currentCooldowns;
 //      Players who were decided to be violators and
 //  were marked for disconnecting.
 //      We'll be maintaining server block as long as even one
 //  of them hasn't yet disconnected.
 var private array<PlayerController> violators;
 //  Is server currently blocked?
 var private bool    becomingActiveBlocked;
 //      This value introduced to accommodate mods such as faked player that can
 //  change 'numPlayers' to a value that isn't directly tied to the
 //  current number of active players.
 //      We remember the difference between active players and 'numPlayers'
 /// variable in game type before server block and add it after block is over.
 //  If some mod introduces a more complicated relation between amount of
 //  active players and 'numPlayers', then it must take care of
 //  compatibility on it's own.
 var private int     recordedNumPlayersMod;
 //      If given 'PlayerController' is registered in our cooldown records, -
 //  returns it's index.
 //      If it doesn't exists (or 'none' value was passes), - returns '-1'.
 private final function int GetCooldownIndex(PlayerController player)
 {
    local int i;
    if (player == none) return -1;
    for (i = 0; i < currentCooldowns.length; i += 1)
    {
        if (currentCooldowns[i].player == player)
        {
            return i;
        }
    }
    return -1;
 }
 //  Checks if given 'PlayerController' is registered as a violator.
 //  'none' value isn't a violator.
 public final function bool IsViolator(PlayerController player)
 {
    local int i;
    if (player == none) return false;
    for (i = 0; i < violators.length; i += 1)
    {
        if (violators[i] == player)
        {
            return true;
        }
    }
    return false;
 }
 //      This function is to notify our fix that some player just changed status
 //  of active player / spectator.
 //  If passes value isn't 'none', it puts given player on cooldown or kicks him.
 public final function NotifyStatusChange(PlayerController player)
 {
    local int               index;
    local CooldownRecord    newRecord;
    if (player == none) return;
    index = GetCooldownIndex(player);
    //  Players already on cool down must be kicked and marked as violators
    if (index >= 0)
    {
        player.Destroy();
        currentCooldowns.Remove(index, 1);
        violators[violators.length] = player;
        if (allowServerBlock)
        {
            SetBlock(true);
        }
    }
    //      Players that aren't on cooldown are
    //  either violators (do nothing, just wait for their disconnect)
    //  or didn't recently change their status (put them on cooldown).
    else if (!IsViolator(player))
    {
        newRecord.player    = player;
        newRecord.cooldown  = spectatorChangeTimeout;
        currentCooldowns[currentCooldowns.length] = newRecord;
    }
 }
 //  Pass 'true' to block server, 'false' to unblock.
 //  Only works if 'allowServerBlock' is set to 'true'.
 private final function SetBlock(bool activateBlock)
 {
    local KFGameType kfGameType;
    //  Do we even need to do anything?
    if (!allowServerBlock)                      return;
    if (activateBlock == becomingActiveBlocked) return;
    //  Only works with 'KFGameType' and it's children.
    if (level != none) kfGameType = KFGameType(level.game);
    if (kfGameType == none)                     return;
    //  Actually block/unblock
    becomingActiveBlocked = activateBlock;
    if (activateBlock)
    {
        recordedNumPlayersMod = GetNumPlayersMod();
        //      This value both can't realistically fall below
        //  'kfGameType.maxPlayer' and won't overflow from random increase
        //  in vanilla code.
        kfGameType.numPlayers = maxInt / 2;
    }
    else
    {
        //      Adding 'recordedNumPlayersMod' should prevent
        //  faked players from breaking.
        kfGameType.numPlayers = GetRealPlayers() + recordedNumPlayersMod;
    }
 }
 //  Performs server blocking if violators have disconnected.
 private final function TryUnblocking()
 {
    local int i;
    if (!allowServerBlock)      return;
    if (!becomingActiveBlocked) return;
    for (i = 0; i < violators.length; i += 1)
    {
        if (violators[i] != none)
        {
            return;
        }
    }
    SetBlock(false);
 }
 //      Counts current amount of "real" active players
 //  (connected to the server and not spectators).
 //      Need 'ConnectionService' to be running, otherwise return '-1'.
 private final function int GetRealPlayers()
 {
    //  Auxiliary variables
    local int               i;
    local int               realPlayersAmount;
    local PlayerController  player;
    //  Information extraction
    local ConnectionService                     service;
    local array<ConnectionService.Connection>   connections;
    service = ConnectionService(class'ConnectionService'.static.GetInstance());
    if (service == none) return -1;
    //  Count non-spectators
    connections = service.GetActiveConnections();
    realPlayersAmount = 0;
    for (i = 0; i < connections.length; i += 1)
    {
        player = connections[i].controllerReference;
        if (player == none)                         continue;
        if (player.playerReplicationInfo == none)   continue;
        if (!player.playerReplicationInfo.bOnlySpectator)
        {
            realPlayersAmount += 1;
        }
    }
    return realPlayersAmount;
 }
 //      Calculates difference between current amount of "real" active players
 //  and 'numPlayers' from 'KFGameType'.
 //  Most typically this difference will be non-zero when using
 //  faked players-type mutators
 //  (difference will be equal to the amount of faked players).
 private final function int GetNumPlayersMod()
 {
    local KFGameType kfGameType;
    if (level != none) kfGameType = KFGameType(level.game);
    if (kfGameType == none) return 0;
    return kfGameType.numPlayers - GetRealPlayers();
 }
 private final function ReduceCooldowns(float timePassed)
 {
    local int i;
    i = 0;
    while (i < currentCooldowns.length)
    {
        currentCooldowns[i].cooldown -= timePassed;
        if (    currentCooldowns[i].player != none
            &&  currentCooldowns[i].cooldown > 0.0)
        {
            i += 1;
        }
        else
        {
            currentCooldowns.Remove(i, 1);
        }
    }
 }
 event Tick(float delta)
 {
    local float trueTimePassed;
    trueTimePassed = delta * (1.1 / level.timeDilation);
    TryUnblocking();
    ReduceCooldowns(trueTimePassed);
 }
 defaultproperties
 {
    //  Configurable variables
    spectatorChangeTimeout  = 0.25
    allowServerBlock        = true
    //  Inner variables
    becomingActiveBlocked   = false
    //  Listeners
    requiredListeners(0) = class'BroadcastListener_FixSpectatorCrash'
 }
--- a/sources/FixZedTimeLags/FixZedTimeLags.uc
+++ b/sources/FixZedTimeLags/FixZedTimeLags.uc
@ -0,0 +1,189 @@
 /**
 *      This feature fixes lags caused by a zed time that can occur
 *  on some maps when a lot of zeds are present at once.
 *      As a side effect it also fixes an issue where during zed time speed up
 *  'zedTimeSlomoScale' was assumed to be default value of '0.2'.
 *  Now zed time will behave correctly with mods that
 *  change 'zedTimeSlomoScale'.
 *      Copyright 2020 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 FixZedTimeLags extends Feature
    dependson(ConnectionService)
    config(AcediaFixes);
 /**
 *      When zed time activates, game speed is immediately set to
 *  'zedTimeSlomoScale' (0.2 by default), defined, like all other variables,
 *  in 'KFGameType'. Zed time lasts 'zedTimeDuration' seconds (3.0 by default),
 *  but during last 'zedTimeDuration * 0.166' seconds (by default 0.498)
 *  it starts to speed back up, causing game speed to update every tick.
 *      This makes animations look more smooth when exiting zed-time;
 *  however, updating speed every tick for that purpose seems like
 *  an overkill and, combined with things like
 *  increased tick rate, certain maps and raised zed limit,
 *  it can lead to noticeable lags at the end of zed time.
 *      To fix this issue we disable 'Tick' event in
 *  'KFGameType' and then repeat that functionality in our own 'Tick' event,
 *  but only perform game speed updates occasionally,
 *  to make sure that overall amount of updates won't go over a limit,
 *  that can be configured via 'maxGameSpeedUpdatesAmount'
 *      Author's test (looking really hard on clots' animations)
 *  seem to suggest that there shouldn't be much visible difference if
 *  we limit game speed updates to about 2 or 3.
 */
 //      Max amount of game speed updates during speed up phase
 //  (actual amount of updates can't be larger than amount of ticks).
 //  On servers with default 30 tick rate there's usually
 //  about 13 updates total on vanilla game.
 //      Values lower than 1 are treated like 1.
 var private config const int maxGameSpeedUpdatesAmount;
 //      [ADVANCED] Don't change this setting unless you know what you're doing.
 //      Compatibility setting that allows to keep 'GameInfo' 's 'Tick' event
 //  from being disabled.
 //  Useful when running Acedia along with custom 'GameInfo'
 //  (that isn't 'KFGameType') that relies on 'Tick' event.
 //      Note, however, that in order to keep this fix working properly,
 //  it's on you to make sure 'KFGameType.Tick()' logic isn't executed.
 var private config const bool disableTick;
 //  Counts how much time is left until next update
 var private float updateCooldown;
 //  Recorded game type, to avoid constant conversions every tick
 var private KFGameType gameType;
 protected function OnEnabled()
 {
    gameType = KFGameType(level.game);
    if (gameType == none)
    {
        Destroy();
    }
    else if (disableTick)
    {
        gameType.Disable('Tick');
    }
 }
 protected function OnDisabled()
 {
    gameType = KFGameType(level.game);
    if (gameType != none && disableTick)
    {
        gameType.Enable('Tick');
    }
 }
 event Tick(float delta)
 {
    local float trueTimePassed;
    if (gameType == none)           return;
    if (!gameType.bZEDTimeActive)   return;
    //      Unfortunately we need to keep disabling 'Tick' probe function,
    //  because it constantly gets enabled back and I don't know where
    //  (maybe native code?); only really matters during zed time.
    if (disableTick)
    {
        gameType.Disable('Tick');
    }
    //  How much real (not in-game) time has passed
    trueTimePassed = delta * (1.1 / level.timeDilation);
    gameType.currentZEDTimeDuration -= trueTimePassed;
    //  Handle speeding up phase
    if (gameType.bSpeedingBackUp)
    {
        DoSpeedBackUp(trueTimePassed);
    }
    else if (gameType.currentZEDTimeDuration < GetSpeedupDuration())
    {
        gameType.bSpeedingBackUp    = true;
        updateCooldown              = GetFullUpdateCooldown();
        TellClientsZedTimeEnds();
        DoSpeedBackUp(trueTimePassed);
    }
    //  End zed time once it's duration has passed
    if (gameType.currentZEDTimeDuration <= 0)
    {
        gameType.bZEDTimeActive         = false;
        gameType.bSpeedingBackUp        = false;
        gameType.zedTimeExtensionsUsed  = 0;
        gameType.SetGameSpeed(1.0);
    }
 }
 private final function TellClientsZedTimeEnds()
 {
    local int                                   i;
    local KFPlayerController                    player;
    local ConnectionService                     service;
    local array<ConnectionService.Connection>   connections;
    service = ConnectionService(class'ConnectionService'.static.GetInstance());
    if (service == none) return;
    connections = service.GetActiveConnections();
    for (i = 0; i < connections.length; i += 1)
    {
        player = KFPlayerController(connections[i].controllerReference);
        if (player != none)
        {
            //  Play sound of leaving zed time
            player.ClientExitZedTime();
        }
    }
 }
 //      This function is called every tick during speed up phase and manages
 //  gradual game speed increase.
 private final function DoSpeedBackUp(float trueTimePassed)
 {
    //      Game speed will always be updated in our 'Tick' event
    //  at the very end of the zed time.
    //      The rest of the updates will be uniformly distributed
    //  over the speed up duration.
    local float newGameSpeed;
    local float slowdownScale;
    if (maxGameSpeedUpdatesAmount <= 1) return;
    if (updateCooldown > 0.0)
    {
        updateCooldown -= trueTimePassed;
        return;
    }
    else
    {
        updateCooldown = GetFullUpdateCooldown();
    }
    slowdownScale   = gameType.currentZEDTimeDuration / GetSpeedupDuration();
    newGameSpeed    = Lerp(slowdownScale, 1.0, gameType.zedTimeSlomoScale);
    gameType.SetGameSpeed(newGameSpeed);
 }
 private final function float GetSpeedupDuration()
 {
    return gameType.zedTimeDuration  * 0.166;
 }
 private final function float GetFullUpdateCooldown()
 {
    return GetSpeedupDuration() / maxGameSpeedUpdatesAmount;
 }
 defaultproperties
 {
    maxGameSpeedUpdatesAmount   = 3
    disableTick                 = true
 }
--- a/sources/Manifest.uc
+++ b/sources/Manifest.uc
@ -0,0 +1,33 @@
 /**
 *      Manifest for AcediaFixes package
 *      Copyright 2020 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 Manifest extends _manifest
    abstract;
 defaultproperties
 {
    features(0) = class'FixZedTimeLags'
    features(1) = class'FixDoshSpam'
    features(2) = class'FixFFHack'
    features(3) = class'FixInfiniteNades'
    features(4) = class'FixAmmoSelling'
    features(5) = class'FixSpectatorCrash'
    features(6) = class'FixDualiesCost'
    features(7) = class'FixInventoryAbuse'
 }