Paper/patches/unapplied/server/0726-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>
Co-authored-by: maxcom1 <46265094+maxcom1@users.noreply.github.com>

diff --git a/src/main/java/net/minecraft/world/effect/WeavingMobEffect.java b/src/main/java/net/minecraft/world/effect/WeavingMobEffect.java
index e311f94918fb03e9d202cbae71b0909ea3219180..b751748196b458c8a89d512fdd9f9632d25e8be8 100644
--- a/src/main/java/net/minecraft/world/effect/WeavingMobEffect.java
+++ b/src/main/java/net/minecraft/world/effect/WeavingMobEffect.java
@@ -25,11 +25,11 @@ class WeavingMobEffect extends MobEffect {
     @Override
     public void onMobRemoved(ServerLevel world, LivingEntity entity, int amplifier, Entity.RemovalReason reason) {
         if (reason == Entity.RemovalReason.KILLED && (entity instanceof Player || world.getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING))) {
-            this.spawnCobwebsRandomlyAround(world, entity.getRandom(), entity.blockPosition());
+            this.spawnCobwebsRandomlyAround(world, entity.getRandom(), entity.blockPosition(), entity); // Paper - Fire EntityChangeBlockEvent in more places
         }
     }
 
-    private void spawnCobwebsRandomlyAround(ServerLevel world, RandomSource random, BlockPos pos) {
+    private void spawnCobwebsRandomlyAround(ServerLevel world, RandomSource random, BlockPos pos, LivingEntity entity) { // Paper - Fire EntityChangeBlockEvent in more places
         Set<BlockPos> set = Sets.newHashSet();
         int i = this.maxCobwebs.applyAsInt(random);
 
@@ -46,6 +46,7 @@ class WeavingMobEffect extends MobEffect {
         }
 
         for (BlockPos blockPos3 : set) {
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entity, blockPos3, Blocks.COBWEB.defaultBlockState())) continue; // Paper - Fire EntityChangeBlockEvent in more places
             world.setBlock(blockPos3, Blocks.COBWEB.defaultBlockState(), 3);
             world.levelEvent(3018, blockPos3, 0);
         }
diff --git a/src/main/java/net/minecraft/world/entity/LightningBolt.java b/src/main/java/net/minecraft/world/entity/LightningBolt.java
index 2b09e9efad198ff596d88f97d703a8a00c108608..152ecd38814089333b8d61538297ce720756d2c3 100644
--- a/src/main/java/net/minecraft/world/entity/LightningBolt.java
+++ b/src/main/java/net/minecraft/world/entity/LightningBolt.java
@@ -98,7 +98,7 @@ 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);
             }
         }
@@ -202,7 +202,7 @@ 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;
@@ -216,24 +216,29 @@ 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;
@@ -244,7 +249,7 @@ 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;
@@ -261,6 +266,7 @@ 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/item/AxeItem.java b/src/main/java/net/minecraft/world/item/AxeItem.java
index 74c9966093377b67e31b50483c2f24b70734faf6..abff08f2d61014944235ffe2f5494a718a28cc10 100644
--- a/src/main/java/net/minecraft/world/item/AxeItem.java
+++ b/src/main/java/net/minecraft/world/item/AxeItem.java
@@ -67,6 +67,11 @@ 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 08cbf02bba3633a84cce90c202d13f2beb5b88a2..c71a426c47e0ebc57ecb8c9c1d171737a084ccab 100644
--- a/src/main/java/net/minecraft/world/item/EnderEyeItem.java
+++ b/src/main/java/net/minecraft/world/item/EnderEyeItem.java
@@ -45,6 +45,11 @@ 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 6c0fe41692c9d1fa50a4f421eb4735860a9ae0e9..d7924825823b2bf79ca3a26272de11ff8d2ec74c 100644
--- a/src/main/java/net/minecraft/world/item/HoneycombItem.java
+++ b/src/main/java/net/minecraft/world/item/HoneycombItem.java
@@ -74,6 +74,14 @@ 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 serverPlayer) {
                 CriteriaTriggers.ITEM_USED_ON_BLOCK.trigger(serverPlayer, 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 1c8fd643c32226d72d51abc869a49e256dd2432b..f19bd2c25d3c84d9f16cad38ac5c32736f0f3a8d 100644
--- a/src/main/java/net/minecraft/world/item/PotionItem.java
+++ b/src/main/java/net/minecraft/world/item/PotionItem.java
@@ -42,6 +42,12 @@ public class PotionItem extends Item {
         PotionContents potionContents = itemStack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
         BlockState blockState = level.getBlockState(blockPos);
         if (context.getClickedFace() != Direction.DOWN && blockState.is(BlockTags.CONVERTABLE_TO_MUD) && potionContents.is(Potions.WATER)) {
+            // Paper start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, blockPos, Blocks.MUD.defaultBlockState())) {
+                player.containerMenu.sendAllDataToRemote();
+                return InteractionResult.PASS;
+            }
+            // Paper end
             level.playSound(null, blockPos, SoundEvents.GENERIC_SPLASH, SoundSource.BLOCKS, 1.0F, 1.0F);
             player.setItemInHand(context.getHand(), ItemUtils.createFilledResult(itemStack, player, new ItemStack(Items.GLASS_BOTTLE)));
             player.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 c0377341227e8f4f1f7b1448580b3c7bc1b65f48..55c18f182166f4905d623d6f5e909eefd5ed2483 100644
--- a/src/main/java/net/minecraft/world/item/ShovelItem.java
+++ b/src/main/java/net/minecraft/world/item/ShovelItem.java
@@ -46,20 +46,29 @@ 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(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 7629b9212ded7155e94f67ca429f62271e5f5aa0..648c2510beb162e73aed236a3169d0bbb8fc5050 100644
--- a/src/main/java/net/minecraft/world/level/block/CakeBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/CakeBlock.java
@@ -66,6 +66,12 @@ public class CakeBlock extends Block {
             if (block instanceof CandleBlock) {
                 CandleBlock candleblock = (CandleBlock) block;
 
+                // Paper start - call change block event
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(player, pos, CandleCakeBlock.byCandle(candleblock))) {
+                    player.containerMenu.sendAllDataToRemote(); // update inv because candle could decrease
+                    return InteractionResult.TRY_WITH_EMPTY_HAND;
+                }
+                // Paper end - call change block event
                 stack.consume(1, player);
                 world.playSound((Player) null, pos, SoundEvents.CAKE_ADD_CANDLE, SoundSource.BLOCKS, 1.0F, 1.0F);
                 world.setBlockAndUpdate(pos, CandleCakeBlock.byCandle(candleblock));
@@ -97,6 +103,14 @@ 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);
@@ -110,7 +124,7 @@ 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, (Holder) 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 2bcd246a26dad560cf69682b29983d320ebf1884..05b2eab26e2dc8e143e9fff2dcec40cfe927a197 100644
--- a/src/main/java/net/minecraft/world/level/block/ComposterBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/ComposterBlock.java
@@ -243,6 +243,11 @@ public class ComposterBlock extends Block implements WorldlyContainerHolder {
         if (i < 8 && ComposterBlock.COMPOSTABLES.containsKey(stack.getItem())) {
             if (i < 7 && !world.isClientSide) {
                 BlockState iblockdata1 = ComposterBlock.addItem(player, state, world, pos, stack);
+                // 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(stack.getItem()));
@@ -273,11 +278,16 @@ 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);
@@ -318,11 +328,13 @@ 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);
@@ -333,6 +345,11 @@ 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((Holder) GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(entity, iblockdata1));
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
index 8224d5bddb7f7893dee09222a673af54791abcfa..f8828dc8334af19d7b2118e8cf34d94be5e09ee8 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
@@ -260,7 +260,13 @@ public class BeehiveBlockEntity extends BlockEntity {
                                         --j;
                                     }
 
-                                    world.setBlockAndUpdate(blockposition, (BlockState) iblockdata.setValue(BeehiveBlock.HONEY_LEVEL, i + j));
+                                    // Paper start - Fire EntityChangeBlockEvent in more places
+                                    BlockState newBlockState = iblockdata.setValue(BeehiveBlock.HONEY_LEVEL, i + j);
+
+                                    if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entitybee, blockposition, newBlockState)) {
+                                        world.setBlockAndUpdate(blockposition, newBlockState);
+                                    }
+                                    // Paper end - Fire EntityChangeBlockEvent in more places
                                 }
                             }
                         }
diff --git a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
index daf3c26fce7569761951bfd5594c6726d854a9ff..e8a73d34dbb372581b03018aade170a31c266099 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(Holder<GameEvent> event, Vec3 emitterPos, GameEvent.Context emitter) {
-        // Used by BlockComposter
+        // Used by ComposterBlock
     }
 
     @Override