using IW4MAdmin.Plugins.Stats.Models;
using SharedLibraryCore.Database.Models;
using SharedLibraryCore.Helpers;
using SharedLibraryCore.Interfaces;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace IW4MAdmin.Plugins.Stats.Cheat
{
class Detection
{
public enum DetectionType
{
Bone,
Chest,
Offset,
Strain,
Recoil
};
public ChangeTracking<EFACSnapshot> Tracker { get; private set; }
public const int MAX_TRACKED_HIT_COUNT = 10;
public List<EFClientKill> TrackedHits { get; set; }
int Kills;
int HitCount;
Dictionary<IW4Info.HitLocation, HitInfo> HitLocationCount;
double AngleDifferenceAverage;
EFClientStatistics ClientStats;
long LastOffset;
IW4Info.WeaponName LastWeapon;
ILogger Log;
Strain Strain;
readonly DateTime ConnectionTime = DateTime.UtcNow;
private double sessionAverageRecoilAmount;
private class HitInfo
{
public int Count { get; set; }
public double Offset { get; set; }
};
public Detection(ILogger log, EFClientStatistics clientStats)
{
Log = log;
HitLocationCount = new Dictionary<IW4Info.HitLocation, HitInfo>();
foreach (var loc in Enum.GetValues(typeof(IW4Info.HitLocation)))
{
HitLocationCount.Add((IW4Info.HitLocation)loc, new HitInfo());
}
ClientStats = clientStats;
Strain = new Strain();
Tracker = new ChangeTracking<EFACSnapshot>();
TrackedHits = new List<EFClientKill>();
}
/// <summary>
/// Analyze kill and see if performed by a cheater
/// </summary>
/// <param name="hit">kill performed by the player</param>
/// <returns>true if detection reached thresholds, false otherwise</returns>
public DetectionPenaltyResult ProcessHit(EFClientKill hit, bool isDamage)
{
var results = new List<DetectionPenaltyResult>();
if ((hit.DeathType != IW4Info.MeansOfDeath.MOD_PISTOL_BULLET &&
hit.DeathType != IW4Info.MeansOfDeath.MOD_RIFLE_BULLET &&
hit.DeathType != IW4Info.MeansOfDeath.MOD_HEAD_SHOT) ||
hit.HitLoc == IW4Info.HitLocation.none || hit.TimeOffset - LastOffset < 0 ||
// hack: prevents false positives
(LastWeapon != hit.Weapon && (hit.TimeOffset - LastOffset) == 50))
{
return new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Any,
};
}
LastWeapon = hit.Weapon;
HitLocationCount[hit.HitLoc].Count++;
HitCount++;
if (!isDamage)
{
Kills++;
}
#region VIEWANGLES
if (hit.AnglesList.Count >= 2)
{
double realAgainstPredict = Vector3.ViewAngleDistance(hit.AnglesList[0], hit.AnglesList[1], hit.ViewAngles);
// LIFETIME
var hitLoc = ClientStats.HitLocations
.First(hl => hl.Location == hit.HitLoc);
float previousAverage = hitLoc.HitOffsetAverage;
double newAverage = (previousAverage * (hitLoc.HitCount - 1) + realAgainstPredict) / hitLoc.HitCount;
hitLoc.HitOffsetAverage = (float)newAverage;
int totalHits = ClientStats.HitLocations.Sum(_hit => _hit.HitCount);
var weightedLifetimeAverage = ClientStats.HitLocations.Where(_hit => _hit.HitCount > 0)
.Sum(_hit => _hit.HitOffsetAverage * _hit.HitCount) / totalHits;
if (weightedLifetimeAverage > Thresholds.MaxOffset(totalHits) &&
hitLoc.HitCount > 100)
{
Log.WriteDebug("*** Reached Max Lifetime Average for Angle Difference ***");
Log.WriteDebug($"Lifetime Average = {newAverage}");
Log.WriteDebug($"Bone = {hitLoc.Location}");
Log.WriteDebug($"HitCount = {hitLoc.HitCount}");
Log.WriteDebug($"ID = {hit.AttackerId}");
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = hitLoc.HitOffsetAverage,
HitCount = hitLoc.HitCount,
Type = DetectionType.Offset
});
}
// SESSION
var sessionHitLoc = HitLocationCount[hit.HitLoc];
sessionHitLoc.Offset = (sessionHitLoc.Offset * (sessionHitLoc.Count - 1) + realAgainstPredict) / sessionHitLoc.Count;
int totalSessionHits = HitLocationCount.Sum(_hit => _hit.Value.Count);
var weightedSessionAverage = HitLocationCount.Where(_hit => _hit.Value.Count > 0)
.Sum(_hit => _hit.Value.Offset * _hit.Value.Count) / totalSessionHits;
AngleDifferenceAverage = weightedSessionAverage;
if (weightedSessionAverage > Thresholds.MaxOffset(totalSessionHits) &&
totalSessionHits >= (Thresholds.MediumSampleMinKills * 2))
{
Log.WriteDebug("*** Reached Max Session Average for Angle Difference ***");
Log.WriteDebug($"Session Average = {weightedSessionAverage}");
Log.WriteDebug($"HitCount = {HitCount}");
Log.WriteDebug($"ID = {hit.AttackerId}");
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = weightedSessionAverage,
HitCount = HitCount,
Type = DetectionType.Offset,
Location = hitLoc.Location
});
}
#if DEBUG
Log.WriteDebug($"PredictVsReal={realAgainstPredict}");
#endif
}
#endregion
#region STRAIN
double currentStrain = Strain.GetStrain(hit.Distance / 0.0254, hit.ViewAngles, Math.Max(50, hit.TimeOffset - LastOffset));
#if DEBUG == true
Log.WriteDebug($"Current Strain: {currentStrain}");
#endif
LastOffset = hit.TimeOffset;
if (currentStrain > ClientStats.MaxStrain)
{
ClientStats.MaxStrain = currentStrain;
}
// flag
if (currentStrain > Thresholds.MaxStrainFlag)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Flag,
Value = currentStrain,
HitCount = HitCount,
Type = DetectionType.Strain
});
}
// ban
if (currentStrain > Thresholds.MaxStrainBan &&
HitCount >= 5)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = currentStrain,
HitCount = HitCount,
Type = DetectionType.Strain
});
}
#endregion
#region RECOIL
float hitRecoilAverage = 0;
if (!Plugin.Config.Configuration().RecoilessWeapons.Any(_weaponRegex => Regex.IsMatch(hit.Weapon.ToString(), _weaponRegex)))
{
hitRecoilAverage = (hit.AnglesList.Sum(_angle => _angle.Z) + hit.ViewAngles.Z) / (hit.AnglesList.Count + 1);
sessionAverageRecoilAmount = (sessionAverageRecoilAmount * (HitCount - 1) + hitRecoilAverage) / HitCount;
var lifeTimeHits = ClientStats.HitLocations.Sum(_loc => _loc.HitCount);
ClientStats.AverageRecoilOffset = (ClientStats.AverageRecoilOffset * (lifeTimeHits - 1) + hitRecoilAverage) / lifeTimeHits;
if (HitCount >= Thresholds.LowSampleMinKills && Kills > Thresholds.LowSampleMinKillsRecoil && sessionAverageRecoilAmount == 0)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = sessionAverageRecoilAmount,
HitCount = HitCount,
Type = DetectionType.Recoil
});
}
}
#endregion
#region SESSION_RATIOS
if (Kills >= Thresholds.LowSampleMinKills)
{
double marginOfError = Thresholds.GetMarginOfError(HitCount);
// determine what the max headshot percentage can be for current number of kills
double lerpAmount = Math.Min(1.0, (HitCount - Thresholds.LowSampleMinKills) / (double)(/*Thresholds.HighSampleMinKills*/ 60 - Thresholds.LowSampleMinKills));
double maxHeadshotLerpValueForFlag = Thresholds.Lerp(Thresholds.HeadshotRatioThresholdLowSample(2.0), Thresholds.HeadshotRatioThresholdHighSample(2.0), lerpAmount) + marginOfError;
double maxHeadshotLerpValueForBan = Thresholds.Lerp(Thresholds.HeadshotRatioThresholdLowSample(3.5), Thresholds.HeadshotRatioThresholdHighSample(3.5), lerpAmount) + marginOfError;
// determine what the max bone percentage can be for current number of kills
double maxBoneRatioLerpValueForFlag = Thresholds.Lerp(Thresholds.BoneRatioThresholdLowSample(2.25), Thresholds.BoneRatioThresholdHighSample(2.25), lerpAmount) + marginOfError;
double maxBoneRatioLerpValueForBan = Thresholds.Lerp(Thresholds.BoneRatioThresholdLowSample(3.25), Thresholds.BoneRatioThresholdHighSample(3.25), lerpAmount) + marginOfError;
// calculate headshot ratio
double currentHeadshotRatio = ((HitLocationCount[IW4Info.HitLocation.head].Count + HitLocationCount[IW4Info.HitLocation.helmet].Count + HitLocationCount[IW4Info.HitLocation.neck].Count) / (double)HitCount);
// calculate maximum bone
double currentMaxBoneRatio = (HitLocationCount.Values.Select(v => v.Count / (double)HitCount).Max());
var bone = HitLocationCount.FirstOrDefault(b => b.Value.Count == HitLocationCount.Values.Max(_hit => _hit.Count)).Key;
#region HEADSHOT_RATIO
// flag on headshot
if (currentHeadshotRatio > maxHeadshotLerpValueForFlag)
{
// ban on headshot
if (currentHeadshotRatio > maxHeadshotLerpValueForBan)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = currentHeadshotRatio,
Location = IW4Info.HitLocation.head,
HitCount = HitCount,
Type = DetectionType.Bone
});
}
else
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Flag,
Value = currentHeadshotRatio,
Location = IW4Info.HitLocation.head,
HitCount = HitCount,
Type = DetectionType.Bone
});
}
}
#endregion
#region BONE_RATIO
// flag on bone ratio
else if (currentMaxBoneRatio > maxBoneRatioLerpValueForFlag)
{
// ban on bone ratio
if (currentMaxBoneRatio > maxBoneRatioLerpValueForBan)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = currentMaxBoneRatio,
Location = bone,
HitCount = HitCount,
Type = DetectionType.Bone
});
}
else
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Flag,
Value = currentMaxBoneRatio,
Location = bone,
HitCount = HitCount,
Type = DetectionType.Bone
});
}
}
#endregion
}
#region CHEST_ABDOMEN_RATIO_SESSION
int chestHits = HitLocationCount[IW4Info.HitLocation.torso_upper].Count;
if (chestHits >= Thresholds.MediumSampleMinKills)
{
double marginOfError = Thresholds.GetMarginOfError(chestHits);
double lerpAmount = Math.Min(1.0, (chestHits - Thresholds.MediumSampleMinKills) / (double)(Thresholds.HighSampleMinKills - Thresholds.LowSampleMinKills));
// determine max acceptable ratio of chest to abdomen kills
double chestAbdomenRatioLerpValueForFlag = Thresholds.Lerp(Thresholds.ChestAbdomenRatioThresholdLowSample(3), Thresholds.ChestAbdomenRatioThresholdHighSample(3), lerpAmount) + marginOfError;
double chestAbdomenLerpValueForBan = Thresholds.Lerp(Thresholds.ChestAbdomenRatioThresholdLowSample(4), Thresholds.ChestAbdomenRatioThresholdHighSample(4), lerpAmount) + marginOfError;
double currentChestAbdomenRatio = HitLocationCount[IW4Info.HitLocation.torso_upper].Count / (double)HitLocationCount[IW4Info.HitLocation.torso_lower].Count;
if (currentChestAbdomenRatio > chestAbdomenRatioLerpValueForFlag)
{
if (currentChestAbdomenRatio > chestAbdomenLerpValueForBan && chestHits >= Thresholds.MediumSampleMinKills * 2)
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Ban,
Value = currentChestAbdomenRatio,
Location = IW4Info.HitLocation.torso_upper,
Type = DetectionType.Chest,
HitCount = chestHits
});
}
else
{
results.Add(new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Flag,
Value = currentChestAbdomenRatio,
Location = IW4Info.HitLocation.torso_upper,
Type = DetectionType.Chest,
HitCount = chestHits
});
}
}
}
#endregion
#endregion
Tracker.OnChange(new EFACSnapshot()
{
When = hit.When,
ClientId = ClientStats.ClientId,
SessionAngleOffset = AngleDifferenceAverage,
RecoilOffset = hitRecoilAverage,
CurrentSessionLength = (int)(DateTime.UtcNow - ConnectionTime).TotalSeconds,
CurrentStrain = currentStrain,
CurrentViewAngle = hit.ViewAngles,
Hits = HitCount,
Kills = Kills,
Deaths = ClientStats.SessionDeaths,
HitDestinationId = hit.DeathOrigin.Vector3Id,
HitDestination = hit.DeathOrigin,
HitOriginId = hit.KillOrigin.Vector3Id,
HitOrigin = hit.KillOrigin,
EloRating = ClientStats.EloRating,
HitLocation = hit.HitLoc,
LastStrainAngle = Strain.LastAngle,
PredictedViewAngles = hit.AnglesList,
// this is in "meters"
Distance = hit.Distance,
SessionScore = ClientStats.SessionScore,
HitType = hit.DeathType,
SessionSPM = ClientStats.SessionSPM,
StrainAngleBetween = Strain.LastDistance,
TimeSinceLastEvent = (int)Strain.LastDeltaTime,
WeaponId = hit.Weapon
});
return results.FirstOrDefault(_result => _result.ClientPenalty == EFPenalty.PenaltyType.Ban) ??
results.FirstOrDefault(_result => _result.ClientPenalty == EFPenalty.PenaltyType.Flag) ??
new DetectionPenaltyResult()
{
ClientPenalty = EFPenalty.PenaltyType.Any,
};
}
}
}