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 234d2daecc5d0bf6a99c0a5f4a87f947a15029d9..89f3a28c20f0e4db4650c435dbcbc923b7bde8aa 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -716,6 +716,18 @@ 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/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 8e71f7a8b62d89f2d770b03b4730d3d030717bfd..d8787985ab4c94e9808332c15b3d16d4b52ba195 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1375,6 +1375,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
     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/server/EntityBoat.java b/src/main/java/net/minecraft/server/EntityBoat.java
index da84cf98022b771bdf0c9d0b284aa7d4d59318e0..baa4a61114e7460c74027e1519332f0dd9582647 100644
--- a/src/main/java/net/minecraft/server/EntityBoat.java
+++ b/src/main/java/net/minecraft/server/EntityBoat.java
@@ -186,6 +186,7 @@ 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/server/EntityMinecartAbstract.java b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
index efe5c0cecaf12ef921f6d32ff6670eff051bf323..022dfdc5b6af4b243e7e4da8660e8e41d04e1a30 100644
--- a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+++ b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
@@ -729,6 +729,7 @@ 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());