Paper/nms-patches/PlayerInteractManager.patch

--- a/net/minecraft/server/PlayerInteractManager.java
+++ b/net/minecraft/server/PlayerInteractManager.java
@@ -1,5 +1,15 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import java.util.ArrayList;
+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.PlayerInteractEvent;
+// CraftBukkit end
+
 public class PlayerInteractManager {
 
     public WorldServer world;
@@ -26,7 +36,7 @@
         this.gamemode = enumgamemode;
         enumgamemode.a(this.player.abilities);
         this.player.updateAbilities();
-        this.player.server.getPlayerList().sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_GAME_MODE, new EntityPlayer[] { this.player}));
+        this.player.server.getPlayerList().sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_GAME_MODE, new EntityPlayer[] { this.player}), this.player); // CraftBukkit
         this.world.everyoneSleeping();
     }
 
@@ -51,7 +61,7 @@
     }
 
     public void a() {
-        ++this.currentTick;
+        this.currentTick = MinecraftServer.currentTick; // CraftBukkit;
         float f;
         int i;
 
@@ -96,6 +106,19 @@
     }
 
     public void a(BlockPosition blockposition, EnumDirection enumdirection) {
+        // CraftBukkit start
+        PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_BLOCK, blockposition, enumdirection, this.player.inventory.getItemInHand(), EnumHand.MAIN_HAND);
+        if (event.isCancelled()) {
+            // Let the client know the block still exists
+            ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+            // Update any tile entity data for this block
+            TileEntity tileentity = this.world.getTileEntity(blockposition);
+            if (tileentity != null) {
+                this.player.playerConnection.sendPacket(tileentity.getUpdatePacket());
+            }
+            return;
+        }
+        // CraftBukkit end
         if (this.isCreative()) {
             if (!this.world.douseFire((EntityHuman) null, blockposition, enumdirection)) {
                 this.breakBlock(blockposition);
@@ -122,15 +145,49 @@
                 }
             }
 
-            this.world.douseFire((EntityHuman) null, blockposition, enumdirection);
+            // this.world.douseFire((EntityHuman) null, blockposition, enumdirection); // CraftBukkit - Moved down
             this.lastDigTick = this.currentTick;
             float f = 1.0F;
             IBlockData iblockdata = this.world.getType(blockposition);
 
-            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.
+                IBlockData data = this.world.getType(blockposition);
+                if (data.getBlock() instanceof BlockDoor) {
+                    // For some reason *BOTH* the bottom/top part have to be marked updated.
+                    boolean bottom = data.get(BlockDoor.HALF) == BlockPropertyDoubleBlockHalf.LOWER;
+                    ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+                    ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, bottom ? blockposition.up() : blockposition.down()));
+                } else if (data.getBlock() instanceof BlockTrapdoor) {
+                    ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+                }
+            } else if (!iblockdata.isAir()) {
                 iblockdata.attack(this.world, blockposition, this.player);
                 f = iblockdata.getDamage(this.player, this.player.world, blockposition);
+                // Allow fire punching to be blocked
+                this.world.douseFire((EntityHuman) null, blockposition, enumdirection);
+            }
+
+            if (event.useItemInHand() == Event.Result.DENY) {
+                // If we 'insta destroyed' then the client needs to be informed.
+                if (f > 1.0f) {
+                    ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+                }
+                return;
+            }
+            org.bukkit.event.block.BlockDamageEvent blockEvent = CraftEventFactory.callBlockDamageEvent(this.player, blockposition.getX(), blockposition.getY(), blockposition.getZ(), this.player.inventory.getItemInHand(), f >= 1.0f);
+
+            if (blockEvent.isCancelled()) {
+                // Let the client know the block still exists
+                ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+                return;
+            }
+
+            if (blockEvent.getInstaBreak()) {
+                f = 2.0f;
             }
+            // CraftBukkit end
 
             if (!iblockdata.isAir() && f >= 1.0F) {
                 this.breakBlock(blockposition);
@@ -149,6 +206,7 @@
 
     public void a(BlockPosition blockposition) {
         if (blockposition.equals(this.f)) {
+            this.currentTick = MinecraftServer.currentTick; // CraftBukkit
             int i = this.currentTick - this.lastDigTick;
             IBlockData iblockdata = this.world.getType(blockposition);
 
@@ -166,6 +224,10 @@
                     this.j = this.lastDigTick;
                 }
             }
+        // CraftBukkit start - Force block reset to client
+        } else {
+            this.player.playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+            // CraftBukkit end
         }
 
     }
@@ -190,10 +252,66 @@
 
     public boolean breakBlock(BlockPosition blockposition) {
         IBlockData iblockdata = this.world.getType(blockposition);
+        // CraftBukkit start - fire BlockBreakEvent
+        org.bukkit.block.Block bblock = CraftBlock.at(world, blockposition);
+        BlockBreakEvent event = null;
+
+        if (this.player instanceof EntityPlayer) {
+            // Sword + Creative mode pre-cancel
+            boolean isSwordNoBreak = !this.player.getItemInMainHand().getItem().a(iblockdata, this.world, blockposition, (EntityHuman) 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 (world.getTileEntity(blockposition) == null && !isSwordNoBreak) {
+                PacketPlayOutBlockChange packet = new PacketPlayOutBlockChange(this.world, blockposition);
+                packet.block = Blocks.AIR.getBlockData();
+                ((EntityPlayer) this.player).playerConnection.sendPacket(packet);
+            }
+
+            event = new BlockBreakEvent(bblock, this.player.getBukkitEntity());
+
+            // Sword + Creative mode pre-cancel
+            event.setCancelled(isSwordNoBreak);
+
+            // Calculate default block experience
+            IBlockData nmsData = this.world.getType(blockposition);
+            Block nmsBlock = nmsData.getBlock();
+
+            ItemStack itemstack = this.player.getEquipment(EnumItemSlot.MAINHAND);
+
+            if (nmsBlock != null && !event.isCancelled() && !this.isCreative() && this.player.hasBlock(nmsBlock.getBlockData())) {
+                event.setExpToDrop(nmsBlock.getExpDrop(nmsData, this.world, blockposition, itemstack));
+            }
+
+            this.world.getServer().getPluginManager().callEvent(event);
 
-        if (!this.player.getItemInMainHand().getItem().a(iblockdata, (World) this.world, blockposition, (EntityHuman) this.player)) {
+            if (event.isCancelled()) {
+                if (isSwordNoBreak) {
+                    return false;
+                }
+                // Let the client know the block still exists
+                ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(this.world, blockposition));
+
+                // Brute force all possible updates
+                for (EnumDirection dir : EnumDirection.values()) {
+                    ((EntityPlayer) this.player).playerConnection.sendPacket(new PacketPlayOutBlockChange(world, blockposition.shift(dir)));
+                }
+
+                // Update any tile entity data for this block
+                TileEntity tileentity = this.world.getTileEntity(blockposition);
+                if (tileentity != null) {
+                    this.player.playerConnection.sendPacket(tileentity.getUpdatePacket());
+                }
+                return false;
+            }
+        }
+        // CraftBukkit end
+
+        if (false && !this.player.getItemInMainHand().getItem().a(iblockdata, (World) this.world, blockposition, (EntityHuman) this.player)) { // CraftBukkit - false
             return false;
         } else {
+            iblockdata = this.world.getType(blockposition); // CraftBukkit - update state from plugins
+            if (iblockdata.isAir()) return false; // CraftBukkit - A plugin set block to air without cancelling
             TileEntity tileentity = this.world.getTileEntity(blockposition);
             Block block = iblockdata.getBlock();
 
@@ -221,6 +339,10 @@
                     }
                 }
 
+                // CraftBukkit start
+                org.bukkit.block.BlockState state = bblock.getState();
+                world.captureDrops = new ArrayList<>();
+                // CraftBukkit end
                 boolean flag = this.c(blockposition);
 
                 if (!this.isCreative()) {
@@ -228,13 +350,27 @@
                     boolean flag1 = this.player.hasBlock(iblockdata);
 
                     itemstack1.a(this.world, iblockdata, blockposition, this.player);
-                    if (flag && flag1) {
+                    // CraftBukkit start - Check if block should drop items
+                    if (flag && flag1 && event.isDropItems()) {
                         ItemStack itemstack2 = itemstack1.isEmpty() ? ItemStack.a : itemstack1.cloneItemStack();
 
                         iblockdata.getBlock().a(this.world, this.player, blockposition, iblockdata, tileentity, itemstack2);
                     }
+                    // CraftBukkit end
                 }
 
+                if (event.isDropItems()) {
+                    org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockDropItemEvent(bblock, state, this.player, world.captureDrops);
+                }
+                world.captureDrops = null;
+                // CraftBukkit end
+
+                // CraftBukkit start - Drop event experience
+                if (flag && event != null) {
+                    iblockdata.getBlock().dropExperience(this.world, blockposition, event.getExpToDrop());
+                }
+                // CraftBukkit end
+
                 return flag;
             }
         }
@@ -277,12 +413,41 @@
         }
     }
 
+    // CraftBukkit start - whole method
+    public boolean interactResult = false;
+    public boolean firedInteract = false;
     public EnumInteractionResult a(EntityHuman entityhuman, World world, ItemStack itemstack, EnumHand enumhand, MovingObjectPositionBlock movingobjectpositionblock) {
         BlockPosition blockposition = movingobjectpositionblock.getBlockPosition();
         IBlockData iblockdata = world.getType(blockposition);
+        EnumInteractionResult enuminteractionresult = EnumInteractionResult.PASS;
+        if (iblockdata.isAir()) return enuminteractionresult;
+        boolean cancelledBlock = false;
 
         if (this.gamemode == EnumGamemode.SPECTATOR) {
             ITileInventory itileinventory = iblockdata.b(world, blockposition);
+            cancelledBlock = !(itileinventory instanceof ITileInventory);
+        }
+
+        if (entityhuman.getCooldownTracker().a(itemstack.getItem())) {
+            cancelledBlock = true;
+        }
+
+        PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(entityhuman, Action.RIGHT_CLICK_BLOCK, blockposition, movingobjectpositionblock.getDirection(), itemstack, cancelledBlock, enumhand);
+        firedInteract = true;
+        interactResult = event.useItemInHand() == Event.Result.DENY;
+
+        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 BlockDoor) {
+                boolean bottom = iblockdata.get(BlockDoor.HALF) == BlockPropertyDoubleBlockHalf.LOWER;
+                ((EntityPlayer) entityhuman).playerConnection.sendPacket(new PacketPlayOutBlockChange(world, bottom ? blockposition.up() : blockposition.down()));
+            } else if (iblockdata.getBlock() instanceof BlockCake) {
+                ((EntityPlayer) entityhuman).getBukkitEntity().sendHealthUpdate(); // SPIGOT-1341 - reset health for cake
+            }
+            ((EntityPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-2867
+            enuminteractionresult = (event.useItemInHand() != Event.Result.ALLOW) ? EnumInteractionResult.SUCCESS : EnumInteractionResult.PASS;
+        } else if (this.gamemode == EnumGamemode.SPECTATOR) {
+            ITileInventory itileinventory = iblockdata.b(world, blockposition);
 
             if (itileinventory != null) {
                 entityhuman.openContainer(itileinventory);
@@ -294,24 +459,26 @@
             boolean flag = !entityhuman.getItemInMainHand().isEmpty() || !entityhuman.getItemInOffHand().isEmpty();
             boolean flag1 = entityhuman.isSneaking() && flag;
 
-            if (!flag1 && iblockdata.interact(world, entityhuman, enumhand, movingobjectpositionblock)) {
-                return EnumInteractionResult.SUCCESS;
-            } else if (!itemstack.isEmpty() && !entityhuman.getCooldownTracker().a(itemstack.getItem())) {
+            if (!flag1) {
+                enuminteractionresult = iblockdata.interact(world, entityhuman, enumhand, movingobjectpositionblock) ? EnumInteractionResult.SUCCESS : EnumInteractionResult.FAIL;
+            }
+
+            if (!itemstack.isEmpty() && enuminteractionresult != EnumInteractionResult.SUCCESS && !interactResult) { // add !interactResult SPIGOT-764
                 ItemActionContext itemactioncontext = new ItemActionContext(entityhuman, enumhand, movingobjectpositionblock);
 
                 if (this.isCreative()) {
                     int i = itemstack.getCount();
-                    EnumInteractionResult enuminteractionresult = itemstack.placeItem(itemactioncontext);
+                    enuminteractionresult = itemstack.placeItem(itemactioncontext, enumhand);
 
                     itemstack.setCount(i);
                     return enuminteractionresult;
                 } else {
-                    return itemstack.placeItem(itemactioncontext);
+                    return itemstack.placeItem(itemactioncontext, enumhand);
                 }
-            } else {
-                return EnumInteractionResult.PASS;
             }
         }
+        return enuminteractionresult;
+        // CraftBukkit end
     }
 
     public void a(WorldServer worldserver) {