PaperMC/paper-server/patches/sources/net/minecraft/server/level/ServerPlayerGameMode.java.patch

--- a/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -13,6 +13,7 @@
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.MenuProvider;
 import net.minecraft.world.entity.EquipmentSlot;
+import net.minecraft.world.item.DoubleHighBlockItem;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.context.UseOnContext;
 import net.minecraft.world.item.enchantment.EnchantmentHelper;
@@ -20,12 +21,30 @@
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.GameMasterBlock;
+import net.minecraft.world.level.block.TrapDoorBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.properties.DoubleBlockHalf;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.Vec3;
 import org.slf4j.Logger;
 
+// CraftBukkit start
+import java.util.ArrayList;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.CakeBlock;
+import net.minecraft.world.level.block.DoorBlock;
+import org.bukkit.GameMode;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.Event;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerGameModeChangeEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+// CraftBukkit end
+
 public class ServerPlayerGameMode {
 
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -56,9 +75,16 @@
         if (gameMode == this.gameModeForPlayer) {
             return false;
         } else {
+            // CraftBukkit start
+            PlayerGameModeChangeEvent event = new PlayerGameModeChangeEvent(this.player.getBukkitEntity(), GameMode.getByValue(gameMode.getId()));
+            this.level.getCraftServer().getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                return false;
+            }
+            // CraftBukkit end
             this.setGameModeForPlayer(gameMode, this.previousGameModeForPlayer);
             this.player.onUpdateAbilities();
-            this.player.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, this.player));
+            this.player.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, this.player), this.player); // CraftBukkit
             this.level.updateSleepingPlayerList();
             if (gameMode == GameType.CREATIVE) {
                 this.player.resetCurrentImpulseContext();
@@ -92,7 +118,7 @@
     }
 
     public void tick() {
-        ++this.gameTicks;
+        this.gameTicks = MinecraftServer.currentTick; // CraftBukkit;
         BlockState iblockdata;
 
         if (this.hasDelayedDestroy) {
@@ -146,15 +172,45 @@
 
             if (action == ServerboundPlayerActionPacket.Action.START_DESTROY_BLOCK) {
                 if (!this.level.mayInteract(this.player, pos)) {
+                    // CraftBukkit start - fire PlayerInteractEvent
+                    CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_BLOCK, pos, direction, this.player.getInventory().getSelected(), InteractionHand.MAIN_HAND);
                     this.player.connection.send(new ClientboundBlockUpdatePacket(pos, this.level.getBlockState(pos)));
                     this.debugLogging(pos, false, sequence, "may not interact");
+                    // Update any tile entity data for this block
+                    BlockEntity tileentity = this.level.getBlockEntity(pos);
+                    if (tileentity != null) {
+                        this.player.connection.send(tileentity.getUpdatePacket());
+                    }
+                    // CraftBukkit end
                     return;
                 }
 
+                // CraftBukkit start
+                PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_BLOCK, pos, direction, this.player.getInventory().getSelected(), InteractionHand.MAIN_HAND);
+                if (event.isCancelled()) {
+                    // Let the client know the block still exists
+                    this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+                    // Update any tile entity data for this block
+                    BlockEntity tileentity = this.level.getBlockEntity(pos);
+                    if (tileentity != null) {
+                        this.player.connection.send(tileentity.getUpdatePacket());
+                    }
+                    return;
+                }
+                // CraftBukkit end
+
                 if (this.isCreative()) {
                     this.destroyAndAck(pos, sequence, "creative destroy");
+                    return;
+                }
+
+                // Spigot start - handle debug stick left click for non-creative
+                if (this.player.getMainHandItem().is(net.minecraft.world.item.Items.DEBUG_STICK)
+                        && ((net.minecraft.world.item.DebugStickItem) net.minecraft.world.item.Items.DEBUG_STICK).handleInteraction(this.player, this.level.getBlockState(pos), this.level, pos, false, this.player.getMainHandItem())) {
+                    this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
                     return;
                 }
+                // Spigot end
 
                 if (this.player.blockActionRestricted(this.level, pos, this.gameModeForPlayer)) {
                     this.player.connection.send(new ClientboundBlockUpdatePacket(pos, this.level.getBlockState(pos)));
@@ -166,7 +222,19 @@
                 float f = 1.0F;
 
                 iblockdata = this.level.getBlockState(pos);
-                if (!iblockdata.isAir()) {
+                // CraftBukkit start - Swings at air do *NOT* exist.
+                if (event.useInteractedBlock() == Event.Result.DENY) {
+                    // If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
+                    BlockState data = this.level.getBlockState(pos);
+                    if (data.getBlock() instanceof DoorBlock) {
+                        // For some reason *BOTH* the bottom/top part have to be marked updated.
+                        boolean bottom = data.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
+                        this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+                        this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, bottom ? pos.above() : pos.below()));
+                    } else if (data.getBlock() instanceof TrapDoorBlock) {
+                        this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+                    }
+                } else if (!iblockdata.isAir()) {
                     EnchantmentHelper.onHitBlock(this.level, this.player.getMainHandItem(), this.player, this.player, EquipmentSlot.MAINHAND, Vec3.atCenterOf(pos), iblockdata, (item) -> {
                         this.player.onEquippedItemBroken(item, EquipmentSlot.MAINHAND);
                     });
@@ -174,6 +242,26 @@
                     f = iblockdata.getDestroyProgress(this.player, this.player.level(), pos);
                 }
 
+                if (event.useItemInHand() == Event.Result.DENY) {
+                    // If we 'insta destroyed' then the client needs to be informed.
+                    if (f > 1.0f) {
+                        this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+                    }
+                    return;
+                }
+                org.bukkit.event.block.BlockDamageEvent blockEvent = CraftEventFactory.callBlockDamageEvent(this.player, pos, this.player.getInventory().getSelected(), f >= 1.0f);
+
+                if (blockEvent.isCancelled()) {
+                    // Let the client know the block still exists
+                    this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+                    return;
+                }
+
+                if (blockEvent.getInstaBreak()) {
+                    f = 2.0f;
+                }
+                // CraftBukkit end
+
                 if (!iblockdata.isAir() && f >= 1.0F) {
                     this.destroyAndAck(pos, sequence, "insta mine");
                 } else {
@@ -218,13 +306,15 @@
             } else if (action == ServerboundPlayerActionPacket.Action.ABORT_DESTROY_BLOCK) {
                 this.isDestroyingBlock = false;
                 if (!Objects.equals(this.destroyPos, pos)) {
-                    ServerPlayerGameMode.LOGGER.warn("Mismatch in destroy block pos: {} {}", this.destroyPos, pos);
+                    ServerPlayerGameMode.LOGGER.debug("Mismatch in destroy block pos: {} {}", this.destroyPos, pos); // CraftBukkit - SPIGOT-5457 sent by client when interact event cancelled
                     this.level.destroyBlockProgress(this.player.getId(), this.destroyPos, -1);
                     this.debugLogging(pos, true, sequence, "aborted mismatched destroying");
                 }
 
                 this.level.destroyBlockProgress(this.player.getId(), pos, -1);
                 this.debugLogging(pos, true, sequence, "aborted destroying");
+
+                CraftEventFactory.callBlockDamageAbortEvent(this.player, pos, this.player.getInventory().getSelected()); // CraftBukkit
             }
 
         }
@@ -242,10 +332,65 @@
 
     public boolean destroyBlock(BlockPos pos) {
         BlockState iblockdata = this.level.getBlockState(pos);
+        // CraftBukkit start - fire BlockBreakEvent
+        org.bukkit.block.Block bblock = CraftBlock.at(this.level, pos);
+        BlockBreakEvent event = null;
 
-        if (!this.player.getMainHandItem().getItem().canAttackBlock(iblockdata, this.level, pos, this.player)) {
+        if (this.player instanceof ServerPlayer) {
+            // Sword + Creative mode pre-cancel
+            boolean isSwordNoBreak = !this.player.getMainHandItem().getItem().canAttackBlock(iblockdata, this.level, pos, this.player);
+
+            // Tell client the block is gone immediately then process events
+            // Don't tell the client if its a creative sword break because its not broken!
+            if (this.level.getBlockEntity(pos) == null && !isSwordNoBreak) {
+                ClientboundBlockUpdatePacket packet = new ClientboundBlockUpdatePacket(pos, Blocks.AIR.defaultBlockState());
+                this.player.connection.send(packet);
+            }
+
+            event = new BlockBreakEvent(bblock, this.player.getBukkitEntity());
+
+            // Sword + Creative mode pre-cancel
+            event.setCancelled(isSwordNoBreak);
+
+            // Calculate default block experience
+            BlockState nmsData = this.level.getBlockState(pos);
+            Block nmsBlock = nmsData.getBlock();
+
+            ItemStack itemstack = this.player.getItemBySlot(EquipmentSlot.MAINHAND);
+
+            if (nmsBlock != null && !event.isCancelled() && !this.isCreative() && this.player.hasCorrectToolForDrops(nmsBlock.defaultBlockState())) {
+                event.setExpToDrop(nmsBlock.getExpDrop(nmsData, this.level, pos, itemstack, true));
+            }
+
+            this.level.getCraftServer().getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                if (isSwordNoBreak) {
+                    return false;
+                }
+                // Let the client know the block still exists
+                this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos));
+
+                // Brute force all possible updates
+                for (Direction dir : Direction.values()) {
+                    this.player.connection.send(new ClientboundBlockUpdatePacket(this.level, pos.relative(dir)));
+                }
+
+                // Update any tile entity data for this block
+                BlockEntity tileentity = this.level.getBlockEntity(pos);
+                if (tileentity != null) {
+                    this.player.connection.send(tileentity.getUpdatePacket());
+                }
+                return false;
+            }
+        }
+        // CraftBukkit end
+
+        if (false && !this.player.getMainHandItem().getItem().canAttackBlock(iblockdata, this.level, pos, this.player)) { // CraftBukkit - false
             return false;
         } else {
+            iblockdata = this.level.getBlockState(pos); // CraftBukkit - update state from plugins
+            if (iblockdata.isAir()) return false; // CraftBukkit - A plugin set block to air without cancelling
             BlockEntity tileentity = this.level.getBlockEntity(pos);
             Block block = iblockdata.getBlock();
 
@@ -255,6 +400,10 @@
             } else if (this.player.blockActionRestricted(this.level, pos, this.gameModeForPlayer)) {
                 return false;
             } else {
+                // CraftBukkit start
+                org.bukkit.block.BlockState state = bblock.getState();
+                this.level.captureDrops = new ArrayList<>();
+                // CraftBukkit end
                 BlockState iblockdata1 = block.playerWillDestroy(this.level, pos, iblockdata, this.player);
                 boolean flag = this.level.removeBlock(pos, false);
 
@@ -263,19 +412,32 @@
                 }
 
                 if (this.isCreative()) {
-                    return true;
+                    // return true; // CraftBukkit
                 } else {
                     ItemStack itemstack = this.player.getMainHandItem();
                     ItemStack itemstack1 = itemstack.copy();
                     boolean flag1 = this.player.hasCorrectToolForDrops(iblockdata1);
 
                     itemstack.mineBlock(this.level, iblockdata1, pos, this.player);
-                    if (flag && flag1) {
+                    if (flag && flag1 && event.isDropItems()) { // CraftBukkit - Check if block should drop items
                         block.playerDestroy(this.level, this.player, pos, iblockdata1, tileentity, itemstack1);
                     }
 
-                    return true;
+                    // return true; // CraftBukkit
                 }
+                // CraftBukkit start
+                if (event.isDropItems()) {
+                    org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockDropItemEvent(bblock, state, this.player, this.level.captureDrops);
+                }
+                this.level.captureDrops = null;
+
+                // Drop event experience
+                if (flag && event != null) {
+                    iblockdata.getBlock().popExperience(this.level, pos, event.getExpToDrop());
+                }
+
+                return true;
+                // CraftBukkit end
             }
         }
     }
@@ -321,15 +483,54 @@
         }
     }
 
+    // CraftBukkit start - whole method
+    public boolean interactResult = false;
+    public boolean firedInteract = false;
+    public BlockPos interactPosition;
+    public InteractionHand interactHand;
+    public ItemStack interactItemStack;
     public InteractionResult useItemOn(ServerPlayer player, Level world, ItemStack stack, InteractionHand hand, BlockHitResult hitResult) {
         BlockPos blockposition = hitResult.getBlockPos();
         BlockState iblockdata = world.getBlockState(blockposition);
+        boolean cancelledBlock = false;
 
         if (!iblockdata.getBlock().isEnabled(world.enabledFeatures())) {
             return InteractionResult.FAIL;
         } else if (this.gameModeForPlayer == GameType.SPECTATOR) {
             MenuProvider itileinventory = iblockdata.getMenuProvider(world, blockposition);
+            cancelledBlock = !(itileinventory instanceof MenuProvider);
+        }
 
+        if (player.getCooldowns().isOnCooldown(stack)) {
+            cancelledBlock = true;
+        }
+
+        PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(player, Action.RIGHT_CLICK_BLOCK, blockposition, hitResult.getDirection(), stack, cancelledBlock, hand, hitResult.getLocation());
+        this.firedInteract = true;
+        this.interactResult = event.useItemInHand() == Event.Result.DENY;
+        this.interactPosition = blockposition.immutable();
+        this.interactHand = hand;
+        this.interactItemStack = stack.copy();
+
+        if (event.useInteractedBlock() == Event.Result.DENY) {
+            // If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
+            if (iblockdata.getBlock() instanceof DoorBlock) {
+                boolean bottom = iblockdata.getValue(DoorBlock.HALF) == DoubleBlockHalf.LOWER;
+                player.connection.send(new ClientboundBlockUpdatePacket(world, bottom ? blockposition.above() : blockposition.below()));
+            } else if (iblockdata.getBlock() instanceof CakeBlock) {
+                player.getBukkitEntity().sendHealthUpdate(); // SPIGOT-1341 - reset health for cake
+            } else if (this.interactItemStack.getItem() instanceof DoubleHighBlockItem) {
+                // send a correcting update to the client, as it already placed the upper half of the bisected item
+                player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.relative(hitResult.getDirection()).above()));
+
+                // send a correcting update to the client for the block above as well, this because of replaceable blocks (such as grass, sea grass etc)
+                player.connection.send(new ClientboundBlockUpdatePacket(world, blockposition.above()));
+            }
+            player.getBukkitEntity().updateInventory(); // SPIGOT-2867
+            return (event.useItemInHand() != Event.Result.ALLOW) ? InteractionResult.SUCCESS : InteractionResult.PASS;
+        } else if (this.gameModeForPlayer == GameType.SPECTATOR) {
+            MenuProvider itileinventory = iblockdata.getMenuProvider(world, blockposition);
+
             if (itileinventory != null) {
                 player.openMenu(itileinventory);
                 return InteractionResult.CONSUME;
@@ -359,7 +560,7 @@
                 }
             }
 
-            if (!stack.isEmpty() && !player.getCooldowns().isOnCooldown(stack)) {
+            if (!stack.isEmpty() && !this.interactResult) { // add !interactResult SPIGOT-764
                 UseOnContext itemactioncontext = new UseOnContext(player, hand, hitResult);
 
                 if (this.isCreative()) {