PaperMC/patches/unapplied/server/0510-Prevent-headless-pistons-from-being-created.patch

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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 64ccc906fef2c0988c30d289c392b13221b9b4c1..6b725dc2217e68255286caad6a0820bcccffb6da 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -465,6 +465,12 @@ public class PaperConfig {
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set("settings.unsupported-settings.allow-tnt-duplication", null);
}
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+ 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);
+ }
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+
public static int playerAutoSaveRate = -1;
public static int maxPlayerAutoSavePerTick = 10;
private static void playerAutoSaveRate() {
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diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
index 1575fb0bbad6e11f25fb9ce51fd1f15a1b11e0fe..132140e00865fcf84ebe03ffcbc2f30ac11a0b35 100644
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--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -15,6 +15,7 @@ import java.util.Random;
import java.util.Set;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
import net.minecraft.core.Vec3i;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.server.level.ServerLevel;
@@ -35,6 +36,8 @@ 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;
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import net.minecraft.world.level.gameevent.GameEvent;
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import net.minecraft.world.level.material.FluidState;
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@@ -189,6 +192,15 @@ public class Explosion {
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if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f)) {
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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);
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+ if (extension instanceof PistonMovingBlockEntity && ((PistonMovingBlockEntity) extension).isSourcePiston()) {
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+ Direction direction = iblockdata.getValue(PistonHeadBlock.FACING);
+ set.add(blockposition.relative(direction.getOpposite()));
+ }
+ }
+ // Paper end
}
d4 += d0 * 0.30000001192092896D;