Allow enabling sand duping (#10191)

Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable. 

1 files changed, 36 insertions, 0 deletions

diff --git a/patches/server/0890-Determine-lava-and-water-fluid-explosion-resistance-.patch b/patches/server/0890-Determine-lava-and-water-fluid-explosion-resistance-.patch
new file mode 100644
index 0000000000..bea2e1c86f
--- /dev/null
+++ b/patches/server/0890-Determine-lava-and-water-fluid-explosion-resistance-.patch
@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: galacticwarrior9 <[email protected]>
+Date: Thu, 13 Jul 2023 21:32:13 +0100
+Subject: [PATCH] Determine lava and water fluid explosion resistance by their
+ block explosion resistance
+
+When selecting which explosion resistance to use for lava and water, vanilla selects the highest value between their block explosion resistance and fluid explosion resistance.
+
+Problems emerge when we want to reduce the explosion resistance of water or lava, since the fluid explosion resistance is hardcoded to return 100.0F and can't be changed by a plugin. This simply makes the fluid explosion resistance the same as the block explosion resistance, which allows plugin to change the value. Since both are the same in vanilla, this has no side effects on servers that do not need to do this.
+
+diff --git a/src/main/java/net/minecraft/world/level/material/LavaFluid.java b/src/main/java/net/minecraft/world/level/material/LavaFluid.java
+index 72f8b72c6436ca3b8eaeb39c7d3efe2c1462ae1d..3bb4a9a1a6249e8ba2de237f801210e7f4fd5825 100644
+--- a/src/main/java/net/minecraft/world/level/material/LavaFluid.java
++++ b/src/main/java/net/minecraft/world/level/material/LavaFluid.java
+@@ -232,7 +232,7 @@ public abstract class LavaFluid extends FlowingFluid {
+ 
+     @Override
+     protected float getExplosionResistance() {
+-        return 100.0F;
++        return Blocks.LAVA.getExplosionResistance(); // Paper - Get explosion resistance from actual block
+     }
+ 
+     @Override
+diff --git a/src/main/java/net/minecraft/world/level/material/WaterFluid.java b/src/main/java/net/minecraft/world/level/material/WaterFluid.java
+index c5f9eda32f2cd172569c7b7d72f5dd3e41a34a70..cde93efaecd42b9081405638af3ba91cb5e184c9 100644
+--- a/src/main/java/net/minecraft/world/level/material/WaterFluid.java
++++ b/src/main/java/net/minecraft/world/level/material/WaterFluid.java
+@@ -109,7 +109,7 @@ public abstract class WaterFluid extends FlowingFluid {
+ 
+     @Override
+     protected float getExplosionResistance() {
+-        return 100.0F;
++        return Blocks.WATER.getExplosionResistance(); // Paper - Get explosion resistance from actual block
+     }
+ 
+     @Override