From 7ac07ac07ac07ac07ac07ac07ac07ac07ac07ac0 Mon Sep 17 00:00:00 2001
From: Gabriele C <sgdc3.mail@gmail.com>
Date: Mon, 22 Oct 2018 17:34:10 +0200
Subject: [PATCH] Add option to prevent players from moving into unloaded
 chunks #1551


diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 7ac07ac07ac0..7ac07ac07ac0 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -458,4 +458,9 @@ public class PaperConfig {
             velocitySecretKey = secret.getBytes(StandardCharsets.UTF_8);
         }
     }
+
+    public static boolean preventMovingIntoUnloadedChunks = false;
+    public static void preventMovingIntoUnloadedChunks() {
+        preventMovingIntoUnloadedChunks = getBoolean("settings.prevent-moving-into-unloaded-chunks", false);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 7ac07ac07ac0..7ac07ac07ac0 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -342,6 +342,13 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                 }
                 speed *= 2f; // TODO: Get the speed of the vehicle instead of the player
 
+                // Paper start - Prevent moving into unloaded chunks
+                if(com.destroystokyo.paper.PaperConfig.preventMovingIntoUnloadedChunks && !worldserver.isChunkLoaded((int) Math.floor(d4) >> 4, (int) Math.floor(d6) >> 4, false)) {
+                    this.networkManager.sendPacket(new PacketPlayOutVehicleMove(entity));
+                    return;
+                }
+                // Paper end
+
                 if (d10 - d9 > Math.max(100.0D, Math.pow((double) (org.spigotmc.SpigotConfig.movedTooQuicklyMultiplier * (float) i * speed), 2)) && (!this.minecraftServer.H() || !this.minecraftServer.G().equals(entity.getDisplayName().getString()))) {
                 // CraftBukkit end
                     PlayerConnection.LOGGER.warn("{} (vehicle of {}) moved too quickly! {},{},{}", entity.getDisplayName().getString(), this.player.getDisplayName().getString(), Double.valueOf(d6), Double.valueOf(d7), Double.valueOf(d8));
@@ -893,6 +900,13 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
                                 speed = player.abilities.walkSpeed * 10f;
                             }
 
+                            // Paper start - Prevent moving into unloaded chunks
+                            if(com.destroystokyo.paper.PaperConfig.preventMovingIntoUnloadedChunks && !worldserver.isChunkLoaded((int) Math.floor(d4) >> 4, (int) Math.floor(d6) >> 4, false)) {
+                                this.internalTeleport(this.player.locX, this.player.locY, this.player.locZ, this.player.yaw, this.player.pitch, Collections.emptySet());
+                                return;
+                            }
+                            // Paper end
+
                             if (!this.player.H() && (!this.player.getWorldServer().getGameRules().getBoolean("disableElytraMovementCheck") || !this.player.dc())) {
                                 float f2 = this.player.dc() ? 300.0F : 100.0F;
 
-- 
2.18.0.windows.1