PaperMC/patches/server/0994-Properly-handle-BlockBreakEvent-isDropItems.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sat, 4 Mar 2023 10:52:52 -0800
Subject: [PATCH] Properly handle BlockBreakEvent#isDropItems

Setting whether a block break dropped items controlled
far more than just whether blocks dropped, like stat increases
food consumption, turtle egg count decreases, ice to water
conversions and beehive releases

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index 76cef8f2861af8fcb88b4dad294a8853dd3f3e01..ee12ca53c7919d6d424c4306b90d25660eb14af6 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -438,8 +438,8 @@ public class ServerPlayerGameMode {
                     isCorrectTool = flag1; // Paper
 
                     itemstack.mineBlock(this.level, iblockdata, pos, this.player);
-                    if (flag && flag1 && event.isDropItems()) { // CraftBukkit - Check if block should drop items
-                        block.playerDestroy(this.level, this.player, pos, iblockdata, tileentity, itemstack1);
+                    if (flag && flag1 /* && event.isDropItems() */) { // CraftBukkit - Check if block should drop items // Paper - fix drops not preventing stats/food exhaustion
+                        block.playerDestroy(this.level, this.player, pos, iblockdata, tileentity, itemstack1, event.isDropItems()); // Paper
                     }
 
                     // return true; // CraftBukkit
diff --git a/src/main/java/net/minecraft/world/level/block/BeehiveBlock.java b/src/main/java/net/minecraft/world/level/block/BeehiveBlock.java
index 5cf7b0d0331a8f10aea6dd607193795054a299dd..4b4a6b081ffedc7f637fa1e1726391d8e0fee0a1 100644
--- a/src/main/java/net/minecraft/world/level/block/BeehiveBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/BeehiveBlock.java
@@ -77,8 +77,8 @@ public class BeehiveBlock extends BaseEntityBlock {
     }
 
     @Override
-    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool) {
-        super.playerDestroy(world, player, pos, state, blockEntity, tool);
+    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool, boolean includeDrops) { // Paper
+        super.playerDestroy(world, player, pos, state, blockEntity, tool, includeDrops); // Paper
         if (!world.isClientSide && blockEntity instanceof BeehiveBlockEntity) {
             BeehiveBlockEntity tileentitybeehive = (BeehiveBlockEntity) blockEntity;
 
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index 6c6532e1e73154ab5e6cb18aea44d64870dbbf4f..d4cbff18adb62073a1dceb189043789620af6877 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -416,10 +416,18 @@ public class Block extends BlockBehaviour implements ItemLike {
         return this.defaultBlockState();
     }
 
+    @io.papermc.paper.annotation.DoNotUse // Paper - method below allows better control of item drops
     public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool) {
+        // Paper start
+        this.playerDestroy(world, player, pos, state, blockEntity, tool, true);
+    }
+    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool, boolean includeDrops) {
+        // Paper end
         player.awardStat(Stats.BLOCK_MINED.get(this));
         player.causeFoodExhaustion(0.005F, org.bukkit.event.entity.EntityExhaustionEvent.ExhaustionReason.BLOCK_MINED); // CraftBukkit - EntityExhaustionEvent
+        if (includeDrops) { // Paper
         Block.dropResources(state, world, pos, blockEntity, player, tool);
+        } // Paper
     }
 
     public void setPlacedBy(Level world, BlockPos pos, BlockState state, @Nullable LivingEntity placer, ItemStack itemStack) {}
diff --git a/src/main/java/net/minecraft/world/level/block/DoublePlantBlock.java b/src/main/java/net/minecraft/world/level/block/DoublePlantBlock.java
index 9db66b393e057d93a8025b803ae0ad2a1bca61f6..030b38d5d5d2578d6ef482a239ef58787efa3b08 100644
--- a/src/main/java/net/minecraft/world/level/block/DoublePlantBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DoublePlantBlock.java
@@ -89,8 +89,8 @@ public class DoublePlantBlock extends BushBlock {
     }
 
     @Override
-    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool) {
-        super.playerDestroy(world, player, pos, Blocks.AIR.defaultBlockState(), blockEntity, tool);
+    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool, boolean includeDrops) { // Paper
+        super.playerDestroy(world, player, pos, Blocks.AIR.defaultBlockState(), blockEntity, tool, includeDrops); // Paper
     }
 
     protected static void preventCreativeDropFromBottomPart(Level world, BlockPos pos, BlockState state, Player player) {
diff --git a/src/main/java/net/minecraft/world/level/block/IceBlock.java b/src/main/java/net/minecraft/world/level/block/IceBlock.java
index 5fbdc96f29e29dfc092b9e84a988032db0fa36ab..04089e6f7d6e3d532b00585870283922b6be5246 100644
--- a/src/main/java/net/minecraft/world/level/block/IceBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/IceBlock.java
@@ -25,8 +25,8 @@ public class IceBlock extends HalfTransparentBlock {
     }
 
     @Override
-    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool) {
-        super.playerDestroy(world, player, pos, state, blockEntity, tool);
+    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool, boolean includeDrops) { // Paper
+        super.playerDestroy(world, player, pos, state, blockEntity, tool, includeDrops); // Paper
         // Paper start
         this.afterDestroy(world, pos, tool);
     }
diff --git a/src/main/java/net/minecraft/world/level/block/TurtleEggBlock.java b/src/main/java/net/minecraft/world/level/block/TurtleEggBlock.java
index 845fa7e13e4a3416b504d0a4c5d5e0454d96b8ed..07157822659288e76b2fba34db8d5d566506f33b 100644
--- a/src/main/java/net/minecraft/world/level/block/TurtleEggBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/TurtleEggBlock.java
@@ -166,8 +166,8 @@ public class TurtleEggBlock extends Block {
     }
 
     @Override
-    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool) {
-        super.playerDestroy(world, player, pos, state, blockEntity, tool);
+    public void playerDestroy(Level world, Player player, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, ItemStack tool, boolean includeDrops) { // Paper
+        super.playerDestroy(world, player, pos, state, blockEntity, tool, includeDrops); // Paper
         this.decreaseEggs(world, pos, state);
     }
 
diff --git a/src/test/java/io/papermc/paper/world/block/BlockPlayerDestroyOverrideTest.java b/src/test/java/io/papermc/paper/world/block/BlockPlayerDestroyOverrideTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..7c435f7079b429873f33d7bade82eca0c6b45842
--- /dev/null
+++ b/src/test/java/io/papermc/paper/world/block/BlockPlayerDestroyOverrideTest.java
@@ -0,0 +1,47 @@
+package io.papermc.paper.world.block;
+
+import io.github.classgraph.ClassGraph;
+import io.github.classgraph.ClassInfo;
+import io.github.classgraph.MethodInfo;
+import io.github.classgraph.MethodInfoList;
+import io.github.classgraph.MethodParameterInfo;
+import io.github.classgraph.ScanResult;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Stream;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BlockPlayerDestroyOverrideTest extends AbstractTestingBase {
+
+    public static Stream<ClassInfo> parameters() {
+        final List<ClassInfo> classInfo = new ArrayList<>();
+        try (ScanResult scanResult = new ClassGraph()
+            .enableClassInfo()
+            .enableMethodInfo()
+            .whitelistPackages("net.minecraft")
+            .scan()
+        ) {
+            for (final ClassInfo subclass : scanResult.getSubclasses("net.minecraft.world.level.block.Block")) {
+                final MethodInfoList playerDestroy = subclass.getDeclaredMethodInfo("playerDestroy");
+                if (!playerDestroy.isEmpty()) {
+                    classInfo.add(subclass);
+                }
+            }
+        }
+        return classInfo.stream();
+    }
+
+    @ParameterizedTest
+    @MethodSource("parameters")
+    public void checkPlayerDestroyOverrides(ClassInfo overridesPlayerDestroy) {
+        final MethodInfoList playerDestroy = overridesPlayerDestroy.getDeclaredMethodInfo("playerDestroy");
+        assertEquals(1, playerDestroy.size(), overridesPlayerDestroy.getName() + " has multiple playerDestroy methods");
+        final MethodInfo next = playerDestroy.iterator().next();
+        final MethodParameterInfo[] parameterInfo = next.getParameterInfo();
+        assertEquals("boolean", parameterInfo[parameterInfo.length - 1].getTypeDescriptor().toStringWithSimpleNames(), overridesPlayerDestroy.getName() + " needs to change its override of playerDestroy");
+    }
+}