From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Mariell Hoversholm <proximyst@proximyst.com>
Date: Sat, 14 Nov 2020 16:48:37 +0100
Subject: [PATCH] Collision option for requiring a player participant


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index d052d53771d868e6fa25d8854fc675a808722c65..c293efaa70c67d7a4227d779eac5d3a510a79ee0 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -718,6 +718,18 @@ public class PaperWorldConfig {
         }
     }
 
+    public boolean onlyPlayersCollide = false;
+    public boolean allowVehicleCollisions = true;
+    private void onlyPlayersCollide() {
+        onlyPlayersCollide = getBoolean("only-players-collide", onlyPlayersCollide);
+        allowVehicleCollisions = getBoolean("allow-vehicle-collisions", allowVehicleCollisions);
+        if (onlyPlayersCollide && !allowVehicleCollisions) {
+            log("Collisions will only work if a player is one of the two entities colliding.");
+        } else if (onlyPlayersCollide) {
+            log("Collisions will only work if a player OR a vehicle is one of the two entities colliding.");
+        }
+    }
+
     public int wanderingTraderSpawnMinuteTicks = 1200;
     public int wanderingTraderSpawnDayTicks = 24000;
     public int wanderingTraderSpawnChanceFailureIncrement = 25;
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index f35afa4d8d087649f57020e4f89185cffcb1ed3a..a76d32a978ec6fe749ffc0bd50004bda059b6196 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -1467,6 +1467,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, ne
     public void collide(Entity entity) {
         if (!this.isSameVehicle(entity)) {
             if (!entity.noclip && !this.noclip) {
+                if (this.world.paperConfig.onlyPlayersCollide && !(entity instanceof EntityPlayer || this instanceof EntityPlayer)) return; // Paper
                 double d0 = entity.locX() - this.locX();
                 double d1 = entity.locZ() - this.locZ();
                 double d2 = MathHelper.a(d0, d1);
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/EntityBoat.java b/src/main/java/net/minecraft/world/entity/vehicle/EntityBoat.java
index 2609b83573e0e8532e6c4c36d4f475bf0da6a354..069076d3c7165440217a7632b089ab2aa0fbdb1d 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/EntityBoat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/EntityBoat.java
@@ -14,6 +14,7 @@ import net.minecraft.network.protocol.game.PacketPlayOutSpawnEntity;
 import net.minecraft.network.syncher.DataWatcher;
 import net.minecraft.network.syncher.DataWatcherObject;
 import net.minecraft.network.syncher.DataWatcherRegistry;
+import net.minecraft.server.level.EntityPlayer;
 import net.minecraft.sounds.SoundEffect;
 import net.minecraft.sounds.SoundEffects;
 import net.minecraft.tags.Tag;
@@ -230,6 +231,7 @@ public class EntityBoat extends Entity {
 
     @Override
     public void collide(Entity entity) {
+        if (!this.world.paperConfig.allowVehicleCollisions && this.world.paperConfig.onlyPlayersCollide && !(entity instanceof EntityPlayer)) return; // Paper
         if (entity instanceof EntityBoat) {
             if (entity.getBoundingBox().minY < this.getBoundingBox().maxY) {
                 // CraftBukkit start
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java b/src/main/java/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java
index 2e3ceab3e34f7756764b3471b13d48d1263ecba9..57821301ef031995e6044a17b46c70a693322455 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java
@@ -21,6 +21,7 @@ import net.minecraft.network.protocol.game.PacketPlayOutSpawnEntity;
 import net.minecraft.network.syncher.DataWatcher;
 import net.minecraft.network.syncher.DataWatcherObject;
 import net.minecraft.network.syncher.DataWatcherRegistry;
+import net.minecraft.server.level.EntityPlayer;
 import net.minecraft.tags.Tag;
 import net.minecraft.tags.TagsBlock;
 import net.minecraft.util.MathHelper;
@@ -767,6 +768,7 @@ public abstract class EntityMinecartAbstract extends Entity {
     public void collide(Entity entity) {
         if (!this.world.isClientSide) {
             if (!entity.noclip && !this.noclip) {
+                if (!this.world.paperConfig.allowVehicleCollisions && this.world.paperConfig.onlyPlayersCollide && !(entity instanceof EntityPlayer)) return; // Paper
                 if (!this.w(entity)) {
                     // CraftBukkit start
                     VehicleEntityCollisionEvent collisionEvent = new VehicleEntityCollisionEvent((Vehicle) this.getBukkitEntity(), entity.getBukkitEntity());