PaperMC/patches/server/0784-Fire-EntityChangeBlockEvent-in-more-places.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Mon, 9 Aug 2021 20:45:46 -0700
Subject: [PATCH] Fire EntityChangeBlockEvent in more places

Co-authored-by: ChristopheG <61288881+chrisgdt@users.noreply.github.com>

diff --git a/src/main/java/net/minecraft/world/entity/LightningBolt.java b/src/main/java/net/minecraft/world/entity/LightningBolt.java
index 09c981e2573305bd7f5c3cbcc8f240fa8705a9f2..0db0d67f9ac15372becc1166c37f7f0aede4a4da 100644
--- a/src/main/java/net/minecraft/world/entity/LightningBolt.java
+++ b/src/main/java/net/minecraft/world/entity/LightningBolt.java
@@ -97,7 +97,7 @@ public class LightningBolt extends Entity {
                 }
 
                 this.powerLightningRod();
-                LightningBolt.clearCopperOnLightningStrike(this.level(), this.getStrikePosition());
+                LightningBolt.clearCopperOnLightningStrike(this.level(), this.getStrikePosition(), this); // Paper - Call EntityChangeBlockEvent
                 this.gameEvent(GameEvent.LIGHTNING_STRIKE);
             }
         }
@@ -191,7 +191,7 @@ public class LightningBolt extends Entity {
         }
     }
 
-    private static void clearCopperOnLightningStrike(Level world, BlockPos pos) {
+    private static void clearCopperOnLightningStrike(Level world, BlockPos pos, Entity lightning) { // Paper - Call EntityChangeBlockEvent
         BlockState iblockdata = world.getBlockState(pos);
         BlockPos blockposition1;
         BlockState iblockdata1;
@@ -205,24 +205,29 @@ public class LightningBolt extends Entity {
         }
 
         if (iblockdata1.getBlock() instanceof WeatheringCopper) {
-            world.setBlockAndUpdate(blockposition1, WeatheringCopper.getFirst(world.getBlockState(blockposition1)));
+            // Paper start - Call EntityChangeBlockEvent
+            BlockState newBlock = WeatheringCopper.getFirst(world.getBlockState(blockposition1));
+            if (CraftEventFactory.callEntityChangeBlockEvent(lightning, blockposition1, newBlock)) {
+                world.setBlockAndUpdate(blockposition1, newBlock);
+            }
+            // Paper end - Call EntityChangeBlockEvent
             BlockPos.MutableBlockPos blockposition_mutableblockposition = pos.mutable();
             int i = world.random.nextInt(3) + 3;
 
             for (int j = 0; j < i; ++j) {
                 int k = world.random.nextInt(8) + 1;
 
-                LightningBolt.randomWalkCleaningCopper(world, blockposition1, blockposition_mutableblockposition, k);
+                LightningBolt.randomWalkCleaningCopper(world, blockposition1, blockposition_mutableblockposition, k, lightning); // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
             }
 
         }
     }
 
-    private static void randomWalkCleaningCopper(Level world, BlockPos pos, BlockPos.MutableBlockPos mutablePos, int count) {
+    private static void randomWalkCleaningCopper(Level world, BlockPos pos, BlockPos.MutableBlockPos mutablePos, int count, Entity lightning) { // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
         mutablePos.set(pos);
 
         for (int j = 0; j < count; ++j) {
-            Optional<BlockPos> optional = LightningBolt.randomStepCleaningCopper(world, mutablePos);
+            Optional<BlockPos> optional = LightningBolt.randomStepCleaningCopper(world, mutablePos, lightning); // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
 
             if (optional.isEmpty()) {
                 break;
@@ -233,7 +238,7 @@ public class LightningBolt extends Entity {
 
     }
 
-    private static Optional<BlockPos> randomStepCleaningCopper(Level world, BlockPos pos) {
+    private static Optional<BlockPos> randomStepCleaningCopper(Level world, BlockPos pos, Entity lightning) { // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
         Iterator iterator = BlockPos.randomInCube(world.random, 10, pos, 1).iterator();
 
         BlockPos blockposition1;
@@ -250,6 +255,7 @@ public class LightningBolt extends Entity {
 
         BlockPos blockposition1Final = blockposition1; // CraftBukkit - decompile error
         WeatheringCopper.getPrevious(iblockdata).ifPresent((iblockdata1) -> {
+            if (CraftEventFactory.callEntityChangeBlockEvent(lightning, blockposition1Final, iblockdata1)) // Paper - call EntityChangeBlockEvent
             world.setBlockAndUpdate(blockposition1Final, iblockdata1); // CraftBukkit - decompile error
         });
         world.levelEvent(3002, blockposition1, -1);
diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/TryLaySpawnOnWaterNearLand.java b/src/main/java/net/minecraft/world/entity/ai/behavior/TryLaySpawnOnWaterNearLand.java
index 2c443b421e342ebfbdf941a431ba20560521920b..91b68ee3605afdb845405e455c869e48a7fc9aab 100644
--- a/src/main/java/net/minecraft/world/entity/ai/behavior/TryLaySpawnOnWaterNearLand.java
+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/TryLaySpawnOnWaterNearLand.java
@@ -27,6 +27,12 @@ public class TryLaySpawnOnWaterNearLand {
                                 BlockPos blockPos3 = blockPos2.above();
                                 if (world.getBlockState(blockPos3).isAir()) {
                                     BlockState blockState = frogSpawn.defaultBlockState();
+                                    // Paper start
+                                    if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entity, blockPos3, blockState)) {
+                                        isPregnant.erase(); // forgot pregnant memory
+                                        return true;
+                                    }
+                                    // Paper end
                                     world.setBlock(blockPos3, blockState, 3);
                                     world.gameEvent(GameEvent.BLOCK_PLACE, blockPos3, GameEvent.Context.of(entity, blockState));
                                     world.playSound((Player)null, entity, SoundEvents.FROG_LAY_SPAWN, SoundSource.BLOCKS, 1.0F, 1.0F);
diff --git a/src/main/java/net/minecraft/world/item/AxeItem.java b/src/main/java/net/minecraft/world/item/AxeItem.java
index db507638a97b5a33df712c54daff35b21922c0dd..2e75fd06e9e379eb95ebfe55086ffc327706ab2f 100644
--- a/src/main/java/net/minecraft/world/item/AxeItem.java
+++ b/src/main/java/net/minecraft/world/item/AxeItem.java
@@ -38,6 +38,11 @@ public class AxeItem extends DiggerItem {
             return InteractionResult.PASS;
         } else {
             ItemStack itemStack = context.getItemInHand();
+            // Paper start - EntityChangeBlockEvent
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, blockPos, optional.get())) {
+                return InteractionResult.PASS;
+            }
+            // Paper end
             if (player instanceof ServerPlayer) {
                 CriteriaTriggers.ITEM_USED_ON_BLOCK.trigger((ServerPlayer)player, blockPos, itemStack);
             }
diff --git a/src/main/java/net/minecraft/world/item/EnderEyeItem.java b/src/main/java/net/minecraft/world/item/EnderEyeItem.java
index 1977e702f6af39ebf100c1f2f2edc2d1c4d003b0..cfcd1778b5ae66395400221879dde3575591b23d 100644
--- a/src/main/java/net/minecraft/world/item/EnderEyeItem.java
+++ b/src/main/java/net/minecraft/world/item/EnderEyeItem.java
@@ -43,6 +43,11 @@ public class EnderEyeItem extends Item {
                 return InteractionResult.SUCCESS;
             } else {
                 BlockState iblockdata1 = (BlockState) iblockdata.setValue(EndPortalFrameBlock.HAS_EYE, true);
+                // Paper start
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(context.getPlayer(), blockposition, iblockdata1)) {
+                    return InteractionResult.PASS;
+                }
+                // Paper end
 
                 Block.pushEntitiesUp(iblockdata, iblockdata1, world, blockposition);
                 world.setBlock(blockposition, iblockdata1, 2);
diff --git a/src/main/java/net/minecraft/world/item/HoneycombItem.java b/src/main/java/net/minecraft/world/item/HoneycombItem.java
index 78bdf7c0a058e84cafcd831c6d6f5123c0f168b0..e0cae3b6848af74fefc37a1e3183c501155c4710 100644
--- a/src/main/java/net/minecraft/world/item/HoneycombItem.java
+++ b/src/main/java/net/minecraft/world/item/HoneycombItem.java
@@ -39,6 +39,14 @@ public class HoneycombItem extends Item implements SignApplicator {
         return getWaxed(blockState).map((state) -> {
             Player player = context.getPlayer();
             ItemStack itemStack = context.getItemInHand();
+            // Paper start - EntityChangeBlockEvent
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, blockPos, state)) {
+                if (!player.isCreative()) {
+                    player.containerMenu.sendAllDataToRemote();
+                }
+                return InteractionResult.PASS;
+            }
+            // Paper end
             if (player instanceof ServerPlayer) {
                 CriteriaTriggers.ITEM_USED_ON_BLOCK.trigger((ServerPlayer)player, blockPos, itemStack);
             }
diff --git a/src/main/java/net/minecraft/world/item/PotionItem.java b/src/main/java/net/minecraft/world/item/PotionItem.java
index 5c62741e3a3854a7f674bfec49758f837f3bb9a0..b93ed2896ebeb8ec75eb3cfb717a740c97dd9622 100644
--- a/src/main/java/net/minecraft/world/item/PotionItem.java
+++ b/src/main/java/net/minecraft/world/item/PotionItem.java
@@ -107,6 +107,12 @@ public class PotionItem extends Item {
         BlockState iblockdata = world.getBlockState(blockposition);
 
         if (context.getClickedFace() != Direction.DOWN && iblockdata.is(BlockTags.CONVERTABLE_TO_MUD) && PotionUtils.getPotion(itemstack) == Potions.WATER) {
+            // Paper start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entityhuman, blockposition, Blocks.MUD.defaultBlockState())) {
+                entityhuman.containerMenu.sendAllDataToRemote();
+                return InteractionResult.PASS;
+            }
+            // Paper end
             world.playSound((Player) null, blockposition, SoundEvents.GENERIC_SPLASH, SoundSource.BLOCKS, 1.0F, 1.0F);
             entityhuman.setItemInHand(context.getHand(), ItemUtils.createFilledResult(itemstack, entityhuman, new ItemStack(Items.GLASS_BOTTLE)));
             entityhuman.awardStat(Stats.ITEM_USED.get(itemstack.getItem()));
diff --git a/src/main/java/net/minecraft/world/item/ShovelItem.java b/src/main/java/net/minecraft/world/item/ShovelItem.java
index 32995cb5efdad0bc34ecacacb78cccd21220ba8d..21212462e6b415e96536a27b2c009d1562f18946 100644
--- a/src/main/java/net/minecraft/world/item/ShovelItem.java
+++ b/src/main/java/net/minecraft/world/item/ShovelItem.java
@@ -36,20 +36,29 @@ public class ShovelItem extends DiggerItem {
             Player player = context.getPlayer();
             BlockState blockState2 = FLATTENABLES.get(blockState.getBlock());
             BlockState blockState3 = null;
+            Runnable afterAction = null; // Paper
             if (blockState2 != null && level.getBlockState(blockPos.above()).isAir()) {
-                level.playSound(player, blockPos, SoundEvents.SHOVEL_FLATTEN, SoundSource.BLOCKS, 1.0F, 1.0F);
+                afterAction = () -> level.playSound(player, blockPos, SoundEvents.SHOVEL_FLATTEN, SoundSource.BLOCKS, 1.0F, 1.0F); // Paper
                 blockState3 = blockState2;
             } else if (blockState.getBlock() instanceof CampfireBlock && blockState.getValue(CampfireBlock.LIT)) {
+                afterAction = () -> { // Paper
                 if (!level.isClientSide()) {
                     level.levelEvent((Player)null, 1009, blockPos, 0);
                 }
 
                 CampfireBlock.dowse(context.getPlayer(), level, blockPos, blockState);
+                }; // Paper
                 blockState3 = blockState.setValue(CampfireBlock.LIT, Boolean.valueOf(false));
             }
 
             if (blockState3 != null) {
                 if (!level.isClientSide) {
+                    // Paper start
+                    if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(context.getPlayer(), blockPos, blockState3)) {
+                        return InteractionResult.PASS;
+                    }
+                    afterAction.run();
+                    // Paper end
                     level.setBlock(blockPos, blockState3, 11);
                     level.gameEvent(GameEvent.BLOCK_CHANGE, blockPos, GameEvent.Context.of(player, blockState3));
                     if (player != null) {
diff --git a/src/main/java/net/minecraft/world/level/block/CakeBlock.java b/src/main/java/net/minecraft/world/level/block/CakeBlock.java
index 49fe91a8eaeb2580c8ad0166e72540168af605f6..ca1ccedb5a551328ebfad907f39594b220efaefe 100644
--- a/src/main/java/net/minecraft/world/level/block/CakeBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/CakeBlock.java
@@ -62,6 +62,12 @@ public class CakeBlock extends Block {
             Block block = Block.byItem(item);
 
             if (block instanceof CandleBlock) {
+                // Paper start - call change block event
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, pos, CandleCakeBlock.byCandle(block))) {
+                    player.containerMenu.sendAllDataToRemote(); // update inv because candle could decrease
+                    return InteractionResult.PASS;
+                }
+                // Paper end - call change block event
                 if (!player.isCreative()) {
                     itemstack.shrink(1);
                 }
@@ -91,6 +97,14 @@ public class CakeBlock extends Block {
         if (!player.canEat(false)) {
             return InteractionResult.PASS;
         } else {
+            // Paper start - call change block event
+            int i = state.getValue(CakeBlock.BITES);
+            final BlockState newState = i < MAX_BITES ? state.setValue(CakeBlock.BITES, i + 1) : world.getFluidState(pos).createLegacyBlock();
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, pos, newState)) {
+                ((net.minecraft.server.level.ServerPlayer) player).getBukkitEntity().sendHealthUpdate();
+                return InteractionResult.PASS; // return a non-consume result to cake blocks don't drop their candles
+            }
+            // Paper end - call change block event
             player.awardStat(Stats.EAT_CAKE_SLICE);
             // CraftBukkit start
             // entityhuman.getFoodData().eat(2, 0.1F);
@@ -104,7 +118,7 @@ public class CakeBlock extends Block {
 
             ((net.minecraft.server.level.ServerPlayer) player).getBukkitEntity().sendHealthUpdate();
             // CraftBukkit end
-            int i = (Integer) state.getValue(CakeBlock.BITES);
+            // Paper - move up
 
             world.gameEvent((Entity) player, GameEvent.EAT, pos);
             if (i < 6) {
diff --git a/src/main/java/net/minecraft/world/level/block/ComposterBlock.java b/src/main/java/net/minecraft/world/level/block/ComposterBlock.java
index 6cccdd1d19488275ff3fe90838cf1c31e844d517..413b307acaad5823b9e06f49fa2faf561f5f7b9a 100644
--- a/src/main/java/net/minecraft/world/level/block/ComposterBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/ComposterBlock.java
@@ -238,6 +238,11 @@ public class ComposterBlock extends Block implements WorldlyContainerHolder {
         if (i < 8 && ComposterBlock.COMPOSTABLES.containsKey(itemstack.getItem())) {
             if (i < 7 && !world.isClientSide) {
                 BlockState iblockdata1 = ComposterBlock.addItem(player, state, world, pos, itemstack);
+                // Paper start - handle cancelled events
+                if (iblockdata1 == null) {
+                    return InteractionResult.PASS;
+                }
+                // Paper end
 
                 world.levelEvent(1500, pos, state != iblockdata1 ? 1 : 0);
                 player.awardStat(Stats.ITEM_USED.get(itemstack.getItem()));
@@ -261,11 +266,16 @@ public class ComposterBlock extends Block implements WorldlyContainerHolder {
         if (i < 7 && ComposterBlock.COMPOSTABLES.containsKey(stack.getItem())) {
             // CraftBukkit start
             double rand = world.getRandom().nextDouble();
-            BlockState iblockdata1 = ComposterBlock.addItem(user, state, DummyGeneratorAccess.INSTANCE, pos, stack, rand);
-            if (state == iblockdata1 || !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(user, pos, iblockdata1)) {
+            BlockState iblockdata1 = null; // Paper
+            if (false && (state == iblockdata1 || !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(user, pos, iblockdata1))) { // Paper - move event call into addItem
                 return state;
             }
             iblockdata1 = ComposterBlock.addItem(user, state, world, pos, stack, rand);
+            // Paper start - handle cancelled events
+            if (iblockdata1 == null) {
+                return state;
+            }
+            // Paper end
             // CraftBukkit end
 
             stack.shrink(1);
@@ -306,11 +316,13 @@ public class ComposterBlock extends Block implements WorldlyContainerHolder {
         return iblockdata1;
     }
 
+    @Nullable // Paper
     static BlockState addItem(@Nullable Entity user, BlockState state, LevelAccessor world, BlockPos pos, ItemStack stack) {
         // CraftBukkit start
         return ComposterBlock.addItem(user, state, world, pos, stack, world.getRandom().nextDouble());
     }
 
+    @Nullable // Paper - make it nullable
     static BlockState addItem(@Nullable Entity entity, BlockState iblockdata, LevelAccessor generatoraccess, BlockPos blockposition, ItemStack itemstack, double rand) {
         // CraftBukkit end
         int i = (Integer) iblockdata.getValue(ComposterBlock.LEVEL);
@@ -321,6 +333,11 @@ public class ComposterBlock extends Block implements WorldlyContainerHolder {
         } else {
             int j = i + 1;
             BlockState iblockdata1 = (BlockState) iblockdata.setValue(ComposterBlock.LEVEL, j);
+            // Paper start - move the EntityChangeBlockEvent here to avoid conflict later for the compost events
+            if (entity != null && !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entity, blockposition, iblockdata1)) {
+                return null;
+            }
+            // Paper end
 
             generatoraccess.setBlock(blockposition, iblockdata1, 3);
             generatoraccess.gameEvent(GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(entity, iblockdata1));
diff --git a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
index 32594b4ebe8ab4c820e588573f5e01b08c57984f..a5e34c25e00e7f770bcb6e15ed0bbfe8f369a68a 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
@@ -120,7 +120,7 @@ public class DummyGeneratorAccess implements WorldGenLevel {
 
     @Override
     public void gameEvent(GameEvent event, Vec3 emitterPos, GameEvent.Context emitter) {
-        // Used by BlockComposter
+        // Used by ComposterBlock
     }
 
     @Override