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 ad355eaf5e597be9c35fbf0a635944b16603bdc2..44319f7ebd5e97435b4a4068d638946b74159cf1 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -82,6 +82,18 @@ 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 dd99c2cff98ee6815444127701de181a84f0e4be..2299f0724a23bec984b51b54a7b029fb7a61caef 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -1615,6 +1615,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
     public void push(Entity entity) {
         if (!this.isPassengerOfSameVehicle(entity)) {
             if (!entity.noPhysics && !this.noPhysics) {
+                if (this.level.paperConfig.onlyPlayersCollide && !(entity instanceof ServerPlayer || this instanceof ServerPlayer)) return; // Paper
                 double d0 = entity.getX() - this.getX();
                 double d1 = entity.getZ() - this.getZ();
                 double d2 = Mth.absMax(d0, d1);
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
index 75cff07051d3b81d37926fb1da50af5ba27c34dc..ad49dcc3473fbad306d21cbac4600574e80220a7 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
@@ -832,6 +832,7 @@ public abstract class AbstractMinecart extends Entity {
     public void push(Entity entity) {
         if (!this.level.isClientSide) {
             if (!entity.noPhysics && !this.noPhysics) {
+                if (!this.level.paperConfig.allowVehicleCollisions && this.level.paperConfig.onlyPlayersCollide && !(entity instanceof Player)) return; // Paper
                 if (!this.hasPassenger(entity)) {
                     // CraftBukkit start
                     VehicleEntityCollisionEvent collisionEvent = new VehicleEntityCollisionEvent((Vehicle) this.getBukkitEntity(), entity.getBukkitEntity());
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
index b4516094996c80886b8d7af599ba7c3d4229ba9d..c3d111204601270b57389e1f85456a9e2ada4629 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
@@ -240,6 +240,7 @@ public class Boat extends Entity {
 
     @Override
     public void push(Entity entity) {
+        if (!this.level.paperConfig.allowVehicleCollisions && this.level.paperConfig.onlyPlayersCollide && !(entity instanceof Player)) return; // Paper
         if (entity instanceof Boat) {
             if (entity.getBoundingBox().minY < this.getBoundingBox().maxY) {
                 // CraftBukkit start