From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: commandblockguy <commandblockguy1@gmail.com>
Date: Fri, 14 Aug 2020 14:44:14 -0500
Subject: [PATCH] Prevent headless pistons from being created

Prevent headless pistons from being created by explosions or tree/mushroom growth.

diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index ebbbffd209c6796bc608992e293035141a122d1f..fdd8bf9eb44829c41483cf2de4c977a32face97f 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 {
         set("settings.unsupported-settings.allow-tnt-duplication", null);
     }
 
+    public static boolean allowHeadlessPistons;
+    private static void allowHeadlessPistons() {
+        config.set("settings.unsupported-settings.allow-headless-pistons-readme", "This setting controls if players should be able to create headless pistons.");
+        allowHeadlessPistons = getBoolean("settings.unsupported-settings.allow-headless-pistons", false);
+    }
 }
diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
index f0c789d339fe8402c9c2a684d7e0415fa298b20e..6795132318a4e8b4c7a33b6f4b89a730ea66b97f 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -34,6 +34,8 @@ import net.minecraft.world.level.block.BaseFireBlock;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.piston.PistonHeadBlock;
+import net.minecraft.world.level.block.piston.PistonMovingBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.level.material.FluidState;
@@ -188,6 +190,15 @@ public class Explosion {
 
                             if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f)) {
                                 set.add(blockposition);
+                                // Paper start - prevent headless pistons from forming
+                                if (!com.destroystokyo.paper.PaperConfig.allowHeadlessPistons && iblockdata.getBlock() == Blocks.MOVING_PISTON) {
+                                    BlockEntity extension = this.level.getBlockEntity(blockposition);
+                                    if (extension instanceof PistonMovingBlockEntity && ((PistonMovingBlockEntity) extension).isSourcePiston()) {
+                                       net.minecraft.core.Direction direction = iblockdata.getValue(PistonHeadBlock.FACING);
+                                       set.add(blockposition.relative(direction.getOpposite()));
+                                    }
+                                }
+                                // Paper end
                             }
 
                             d4 += d0 * 0.30000001192092896D;