Purpur/patches/server/0066-Item-entity-immunities.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sat, 22 Feb 2020 15:54:08 -0600
Subject: [PATCH] Item entity immunities


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index d98c489a58c8c2e657a8879b991aa57ef78f5015..8a36478ae555d3becf6e210092854221d3428cd2 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -2275,7 +2275,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
 
     public class TrackedEntity {
 
-        final ServerEntity serverEntity;
+        public final ServerEntity serverEntity; // Purpur -> package -> public
         final Entity entity;
         private final int range;
         SectionPos lastSectionPos;
diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index 946cde51334568c62d9546254a8d4e5d46d95324..854e68c3d4b714e8b68eeec95e90fac9ecf7a517 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -65,7 +65,7 @@ public class ServerEntity {
     private boolean wasRiding;
     private boolean wasOnGround;
     // CraftBukkit start
-    final Set<ServerPlayerConnection> trackedPlayers; // Paper - private -> package
+    public final Set<ServerPlayerConnection> trackedPlayers; // Paper - private -> package // Purpur - package -> public
 
     public ServerEntity(ServerLevel worldserver, Entity entity, int i, boolean flag, Consumer<Packet<?>> consumer, Set<ServerPlayerConnection> trackedPlayers) {
         this.trackedPlayers = trackedPlayers;
diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
index ae4b251e10babb07055d031ff48ac7dd5d4be4a0..1e9f3d5f52a34a9ce70f6e57ad53a24df5e22c4b 100644
--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
@@ -55,6 +55,12 @@ public class ItemEntity extends Entity {
     private int lastTick = MinecraftServer.currentTick - 1; // CraftBukkit
     public boolean canMobPickup = true; // Paper
     private int despawnRate = -1; // Paper
+    // Purpur start
+    public boolean immuneToCactus = false;
+    public boolean immuneToExplosion = false;
+    public boolean immuneToFire = false;
+    public boolean immuneToLightning = false;
+    // Purpur end
 
     public ItemEntity(EntityType<? extends ItemEntity> type, Level world) {
         super(type, world);
@@ -328,6 +334,15 @@ public class ItemEntity extends Entity {
             return false;
         } else if (!this.getItem().getItem().canBeHurtBy(source)) {
             return false;
+        // Purpur start
+        } else if (
+                (immuneToCactus && source == DamageSource.CACTUS) ||
+                (immuneToFire && (source.isFire() || source == DamageSource.IN_FIRE)) ||
+                (immuneToLightning && source == DamageSource.LIGHTNING_BOLT) ||
+                (immuneToExplosion && source.isExplosion())
+        ) {
+            return false;
+        // Purpur end
         } else if (this.level.isClientSide) {
             return true;
         } else {
@@ -513,6 +528,12 @@ public class ItemEntity extends Entity {
         this.getEntityData().set(ItemEntity.DATA_ITEM, stack);
         this.getEntityData().markDirty(ItemEntity.DATA_ITEM); // CraftBukkit - SPIGOT-4591, must mark dirty
         this.despawnRate = level.paperConfig().entities.spawning.altItemDespawnRate.enabled ? level.paperConfig().entities.spawning.altItemDespawnRate.items.getOrDefault(stack.getItem(), level.spigotConfig.itemDespawnRate) : level.spigotConfig.itemDespawnRate; // Paper
+        // Purpur start
+        if (level.purpurConfig.itemImmuneToCactus.contains(stack.getItem())) immuneToCactus = true;
+        if (level.purpurConfig.itemImmuneToExplosion.contains(stack.getItem())) immuneToExplosion = true;
+        if (level.purpurConfig.itemImmuneToFire.contains(stack.getItem())) immuneToFire = true;
+        if (level.purpurConfig.itemImmuneToLightning.contains(stack.getItem())) immuneToLightning = true;
+        // level end
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
index fea44ba6a6584b4a510af6a58cab07eecec6b68b..f3bf5199bc7ddf8a3d0dc67a184e7690efa659eb 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
@@ -148,4 +148,46 @@ public class CraftItem extends CraftEntity implements Item {
     public EntityType getType() {
         return EntityType.DROPPED_ITEM;
     }
+
+    // Purpur start
+    @Override
+    public void setImmuneToCactus(boolean immuneToCactus) {
+        item.immuneToCactus = immuneToCactus;
+    }
+
+    @Override
+    public boolean isImmuneToCactus() {
+        return item.immuneToCactus;
+    }
+
+    @Override
+    public void setImmuneToExplosion(boolean immuneToExplosion) {
+        item.immuneToExplosion = immuneToExplosion;
+    }
+
+    @Override
+    public boolean isImmuneToExplosion() {
+        return item.immuneToExplosion;
+    }
+
+    @Override
+    public void setImmuneToFire(boolean immuneToFire) {
+        item.immuneToFire = immuneToFire;
+    }
+
+    @Override
+    public boolean isImmuneToFire() {
+        return item.immuneToFire;
+    }
+
+    @Override
+    public void setImmuneToLightning(boolean immuneToLightning) {
+        item.immuneToLightning = immuneToLightning;
+    }
+
+    @Override
+    public boolean isImmuneToLightning() {
+        return item.immuneToLightning;
+    }
+    // Purpur end
 }
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index f243cee2b81e27d2ff7fdc7356bf71d2e369ad2a..ca30699fde62277e6794d4ba0b829287cfc7c651 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -124,6 +124,49 @@ public class PurpurWorldConfig {
         elytraDamagePerTridentBoost = getInt("gameplay-mechanics.elytra.damage-per-boost.trident", elytraDamagePerTridentBoost);
     }
 
+    public List<Item> itemImmuneToCactus = new ArrayList<>();
+    public List<Item> itemImmuneToExplosion = new ArrayList<>();
+    public List<Item> itemImmuneToFire = new ArrayList<>();
+    public List<Item> itemImmuneToLightning = new ArrayList<>();
+    private void itemSettings() {
+        itemImmuneToCactus.clear();
+        getList("gameplay-mechanics.item.immune.cactus", new ArrayList<>()).forEach(key -> {
+            if (key.toString().equals("*")) {
+                Registry.ITEM.stream().filter(item -> item != Items.AIR).forEach((item) -> itemImmuneToCactus.add(item));
+                return;
+            }
+            Item item = Registry.ITEM.get(new ResourceLocation(key.toString()));
+            if (item != Items.AIR) itemImmuneToCactus.add(item);
+        });
+        itemImmuneToExplosion.clear();
+        getList("gameplay-mechanics.item.immune.explosion", new ArrayList<>()).forEach(key -> {
+            if (key.toString().equals("*")) {
+                Registry.ITEM.stream().filter(item -> item != Items.AIR).forEach((item) -> itemImmuneToExplosion.add(item));
+                return;
+            }
+            Item item = Registry.ITEM.get(new ResourceLocation(key.toString()));
+            if (item != Items.AIR) itemImmuneToExplosion.add(item);
+        });
+        itemImmuneToFire.clear();
+        getList("gameplay-mechanics.item.immune.fire", new ArrayList<>()).forEach(key -> {
+            if (key.toString().equals("*")) {
+                Registry.ITEM.stream().filter(item -> item != Items.AIR).forEach((item) -> itemImmuneToFire.add(item));
+                return;
+            }
+            Item item = Registry.ITEM.get(new ResourceLocation(key.toString()));
+            if (item != Items.AIR) itemImmuneToFire.add(item);
+        });
+        itemImmuneToLightning.clear();
+        getList("gameplay-mechanics.item.immune.lightning", new ArrayList<>()).forEach(key -> {
+            if (key.toString().equals("*")) {
+                Registry.ITEM.stream().filter(item -> item != Items.AIR).forEach((item) -> itemImmuneToLightning.add(item));
+                return;
+            }
+            Item item = Registry.ITEM.get(new ResourceLocation(key.toString()));
+            if (item != Items.AIR) itemImmuneToLightning.add(item);
+        });
+    }
+
     public double minecartMaxSpeed = 0.4D;
     public boolean minecartPlaceAnywhere = false;
     public boolean minecartControllable = false;