Add Ghost, Anti-Ghost

src/main/java/codes/som/hibiscus/mixins/MixinClientConnection.java

@@ -0,0 +1,22 @@
+package codes.som.hibiscus.mixins;
+
+import codes.som.hibiscus.HibiscusMod;
+import codes.som.hibiscus.events.ReceivePacketEvent;
+import net.minecraft.network.ClientConnection;
+import net.minecraft.network.Packet;
+import net.minecraft.network.listener.PacketListener;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientConnection.class)
+public abstract class MixinClientConnection {
+    @Inject(method = "handlePacket", at = @At("HEAD"), cancellable = true)
+    private static <T extends PacketListener> void onHandlePacket(Packet<T> packet, PacketListener listener, CallbackInfo ci) {
+        var event = new ReceivePacketEvent(packet);
+        HibiscusMod.bus().fire(event);
+        if (event.isCancelled())
+            ci.cancel();
+    }
+}

src/main/java/codes/som/hibiscus/mixins/MixinExtEntity.java

@@ -0,0 +1,15 @@
+package codes.som.hibiscus.mixins;
+
+import net.minecraft.entity.Entity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+@Mixin(Entity.class)
+public interface MixinExtEntity {
+    @Invoker("setFlag")
+    void callSetFlag(int flag, boolean set);
+    
+    @Accessor
+    void setRemovalReason(Entity.RemovalReason reason);
+}

src/main/kotlin/codes/som/hibiscus/api/feature/FeatureCategory.kt

@@ -2,6 +2,7 @@ package codes.som.hibiscus.api.feature
 
 enum class FeatureCategory(val humanName: String) {
     COMBAT("Combat"),
+    EXPLOITS("Exploits"),
     PLAYER("Player"),
     MOVEMENT("Movement"),
     OVERLAY("Overlay"),

src/main/kotlin/codes/som/hibiscus/events/NetworkEvents.kt

@@ -5,6 +5,8 @@ import codes.som.hibiscus.api.event.Event
 import net.minecraft.network.Packet
 
 data class SendPacketEvent(var packet: Packet<*>) : Cancellable(), Event
+data class ReceivePacketEvent(var packet: Packet<*>) : Cancellable(), Event
+
 class NetworkMovingEvent(
     var x: Double,
     var y: Double,

src/main/kotlin/codes/som/hibiscus/features/FeatureList.kt

@@ -1,2 +0,0 @@
-package codes.som.hibiscus.features
-

src/main/kotlin/codes/som/hibiscus/features/FeaturesRegistry.kt

@@ -2,9 +2,11 @@ package codes.som.hibiscus.features
 
 import codes.som.hibiscus.api.feature.Feature
 import codes.som.hibiscus.features.combat.Criticals
+import codes.som.hibiscus.features.exploits.AntiGhost
 import codes.som.hibiscus.features.movement.Flight
 import codes.som.hibiscus.features.movement.Speed
 import codes.som.hibiscus.features.overlay.Overlay
+import codes.som.hibiscus.features.exploits.Ghost
 import codes.som.hibiscus.features.player.NoFallDamage
 
 val ALL_FEATURES: Array<() -> Feature> = arrayOf(
@@ -13,6 +15,8 @@ val ALL_FEATURES: Array<() -> Feature> = arrayOf(
     ::Overlay,
     ::Speed,
     ::Criticals,
+    ::Ghost,
+    ::AntiGhost,
 )
 
 class FeaturesRegistry {

src/main/kotlin/codes/som/hibiscus/features/exploits/AntiGhost.kt

@@ -0,0 +1,33 @@
+package codes.som.hibiscus.features.exploits
+
+import codes.som.hibiscus.api.feature.Feature
+import codes.som.hibiscus.api.feature.FeatureCategory
+import codes.som.hibiscus.events.PlayerTickEvent
+import codes.som.hibiscus.mc
+import codes.som.hibiscus.mixins.MixinExtEntity
+import codes.som.hibiscus.util.ext.requireExtension
+import codes.som.hibiscus.world
+
+class AntiGhost : Feature("Anti Ghost", FeatureCategory.EXPLOITS) {
+    init {
+        on { _: PlayerTickEvent ->
+
+            for (player in world.players) {
+                if (player == mc.player)
+                    continue
+
+                if (player.health <= 0) {
+                    player.deathTime = -1
+                    
+                    requireExtension<MixinExtEntity>(player)
+                    player.setRemovalReason(null)
+                    
+                    player.hurtTime = Int.MAX_VALUE
+
+                    player.prevHeadYaw = player.prevYaw
+                    player.headYaw = player.yaw
+                }
+            }
+        }
+    }
+}

src/main/kotlin/codes/som/hibiscus/features/exploits/Ghost.kt

@@ -0,0 +1,61 @@
+package codes.som.hibiscus.features.exploits
+
+import codes.som.hibiscus.api.feature.Feature
+import codes.som.hibiscus.api.feature.FeatureCategory
+import codes.som.hibiscus.events.PlayerTickEvent
+import codes.som.hibiscus.events.ReceivePacketEvent
+import codes.som.hibiscus.mc
+import codes.som.hibiscus.mixins.MixinExtEntity
+import codes.som.hibiscus.player
+import net.minecraft.client.gui.screen.DeathScreen
+import net.minecraft.network.packet.s2c.play.GameJoinS2CPacket
+import net.minecraft.network.packet.s2c.play.HealthUpdateS2CPacket
+import net.minecraft.network.packet.s2c.play.PlayerRespawnS2CPacket
+
+class Ghost : Feature("Ghost", FeatureCategory.EXPLOITS) {
+    var dead = false
+    
+    init {
+        on { _: PlayerTickEvent ->
+            if (player.health <= 0) {
+                dead = true
+                player.health = Float.MIN_VALUE
+            }
+
+            if (dead) {
+                player.hurtTime = 0
+                player.knockbackVelocity = 0f
+                player.hungerManager.foodLevel = 20
+                player.hungerManager.saturationLevel = 1000F
+                (player as MixinExtEntity).callSetFlag(0, false)
+            }
+
+            if (mc.currentScreen is DeathScreen) {
+                dead = true
+                mc.setScreen(null)
+            }
+        }
+        
+        on { event: ReceivePacketEvent ->
+            val (packet) = event
+            
+            if (packet is HealthUpdateS2CPacket) {
+                if (packet.health <= 0) {
+                    event.cancel()
+                }
+            }
+
+            if (packet is GameJoinS2CPacket || packet is PlayerRespawnS2CPacket) {
+                dead = false
+            }
+        }
+
+        // TODO: Render 0 health on the status bar when dead
+    }
+
+    override fun createFeatureCommand() = super.createFeatureCommand().apply { 
+        branch("respawn") {
+            player.requestRespawn()
+        }
+    }
+}

src/main/resources/hibiscus.mixins.json

@@ -6,9 +6,11 @@
         "defaultRequire": 1
     },
     "mixins": [
+        "MixinClientConnection",
         "MixinClientPlayerEntity",
         "MixinClientPlayNetworkHandler",
         "MixinExtClientPlayerEntity",
+        "MixinExtEntity",
         "MixinExtPlayerInteractEntityC2SPacket",
         "MixinExtPlayerMoveC2SPacket",
         "MixinExtUpdatePlayerAbilitiesC2SPacket",