Paper/nms-patches/PlayerConnection.patch

--- a/net/minecraft/server/PlayerConnection.java
+++ b/net/minecraft/server/PlayerConnection.java
@@ -18,6 +18,48 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.craftbukkit.util.LazyPlayerSet;
+import org.bukkit.craftbukkit.util.Waitable;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.block.SignChangeEvent;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.CraftItemEvent;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryCreativeEvent;
+import org.bukkit.event.inventory.InventoryType.SlotType;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
+import org.bukkit.event.player.PlayerAnimationEvent;
+import org.bukkit.event.player.PlayerChatEvent;
+import org.bukkit.event.player.PlayerCommandPreprocessEvent;
+import org.bukkit.event.player.PlayerInteractAtEntityEvent;
+import org.bukkit.event.player.PlayerInteractEntityEvent;
+import org.bukkit.event.player.PlayerItemHeldEvent;
+import org.bukkit.event.player.PlayerKickEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerResourcePackStatusEvent;
+import org.bukkit.event.player.PlayerSwapHandItemsEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
+import org.bukkit.event.player.PlayerToggleFlightEvent;
+import org.bukkit.event.player.PlayerToggleSneakEvent;
+import org.bukkit.event.player.PlayerToggleSprintEvent;
+import org.bukkit.inventory.CraftingInventory;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.util.NumberConversions;
+// CraftBukkit end
+
 public class PlayerConnection implements PacketListenerPlayIn {
 
     private static final Logger LOGGER = LogManager.getLogger();
@@ -28,7 +70,10 @@
     private long lastKeepAlive;
     private boolean awaitingKeepAlive;
     private long h;
-    private int chatThrottle;
+    // CraftBukkit start - multithreaded fields
+    private volatile int chatThrottle;
+    private static final AtomicIntegerFieldUpdater chatSpamField = AtomicIntegerFieldUpdater.newUpdater(PlayerConnection.class, "chatThrottle");
+    // CraftBukkit end
     private int j;
     private final Int2ShortMap k = new Int2ShortOpenHashMap();
     private double l;
@@ -60,7 +105,33 @@
         networkmanager.setPacketListener(this);
         this.player = entityplayer;
         entityplayer.playerConnection = this;
+
+        // CraftBukkit start - add fields and methods
+        this.server = minecraftserver.server;
+    }
+
+    private final org.bukkit.craftbukkit.CraftServer server;
+    public boolean processedDisconnect;
+    private int lastTick = MinecraftServer.currentTick;
+    private int allowedPlayerTicks = 1;
+    private int lastDropTick = MinecraftServer.currentTick;
+    private int lastBookTick  = MinecraftServer.currentTick;
+    private int dropCount = 0;
+    private static final int SURVIVAL_PLACE_DISTANCE_SQUARED = 6 * 6;
+    private static final int CREATIVE_PLACE_DISTANCE_SQUARED = 7 * 7;
+
+    // Get position of last block hit for BlockDamageLevel.STOPPED
+    private double lastPosX = Double.MAX_VALUE;
+    private double lastPosY = Double.MAX_VALUE;
+    private double lastPosZ = Double.MAX_VALUE;
+    private float lastPitch = Float.MAX_VALUE;
+    private float lastYaw = Float.MAX_VALUE;
+    private boolean justTeleported = false;
+
+    public CraftPlayer getPlayer() {
+        return (this.player == null) ? null : (CraftPlayer) this.player.getBukkitEntity();
     }
+    // CraftBukkit end
 
     public void tick() {
         this.syncPosition();
@@ -106,7 +177,7 @@
         this.minecraftServer.getMethodProfiler().enter("keepAlive");
         long i = SystemUtils.getMonotonicMillis();
 
-        if (i - this.lastKeepAlive >= 15000L) {
+        if (i - this.lastKeepAlive >= 25000L) { // CraftBukkit
             if (this.awaitingKeepAlive) {
                 this.disconnect(new ChatMessage("disconnect.timeout", new Object[0]));
             } else {
@@ -118,15 +189,21 @@
         }
 
         this.minecraftServer.getMethodProfiler().exit();
+        // CraftBukkit start
+        for (int spam; (spam = this.chatThrottle) > 0 && !chatSpamField.compareAndSet(this, spam, spam - 1); ) ;
+        /* Use thread-safe field access instead
         if (this.chatThrottle > 0) {
             --this.chatThrottle;
         }
+        */
+        // CraftBukkit end
 
         if (this.j > 0) {
             --this.j;
         }
 
         if (this.player.F() > 0L && this.minecraftServer.getIdleTimeout() > 0 && SystemUtils.getMonotonicMillis() - this.player.F() > (long) (this.minecraftServer.getIdleTimeout() * 1000 * 60)) {
+            this.player.resetIdleTimer(); // CraftBukkit - SPIGOT-854
             this.disconnect(new ChatMessage("multiplayer.disconnect.idling", new Object[0]));
         }
 
@@ -150,16 +227,46 @@
         return this.minecraftServer.b(this.player.getProfile());
     }
 
+    // CraftBukkit start
+    @Deprecated
     public void disconnect(IChatBaseComponent ichatbasecomponent) {
+        disconnect(CraftChatMessage.fromComponent(ichatbasecomponent, EnumChatFormat.WHITE));
+    }
+    // CraftBukkit end
+
+    public void disconnect(String s) {
+        // CraftBukkit start - fire PlayerKickEvent
+        if (this.processedDisconnect) {
+            return;
+        }
+        String leaveMessage = EnumChatFormat.YELLOW + this.player.getName() + " left the game.";
+
+        PlayerKickEvent event = new PlayerKickEvent(this.server.getPlayer(this.player), s, leaveMessage);
+
+        if (this.server.getServer().isRunning()) {
+            this.server.getPluginManager().callEvent(event);
+        }
+
+        if (event.isCancelled()) {
+            // Do not kick the player
+            return;
+        }
+        // Send the possibly modified leave message
+        s = event.getReason();
+        // CraftBukkit end
+        final ChatComponentText ichatbasecomponent = new ChatComponentText(s);
+
         this.networkManager.sendPacket(new PacketPlayOutKickDisconnect(ichatbasecomponent), (future) -> {
             this.networkManager.close(ichatbasecomponent);
         });
+        this.a(ichatbasecomponent); // CraftBukkit - fire quit instantly
         this.networkManager.stopReading();
         MinecraftServer minecraftserver = this.minecraftServer;
         NetworkManager networkmanager = this.networkManager;
 
         this.networkManager.getClass();
-        minecraftserver.executeSync(networkmanager::handleDisconnection);
+        // CraftBukkit - Don't wait
+        minecraftserver.postToMainThread(networkmanager::handleDisconnection);
     }
 
     @Override
@@ -200,7 +307,34 @@
                 double d9 = entity.getMot().g();
                 double d10 = d6 * d6 + d7 * d7 + d8 * d8;
 
-                if (d10 - d9 > 100.0D && !this.isExemptPlayer()) {
+
+                // CraftBukkit start - handle custom speeds and skipped ticks
+                this.allowedPlayerTicks += (System.currentTimeMillis() / 50) - this.lastTick;
+                this.allowedPlayerTicks = Math.max(this.allowedPlayerTicks, 1);
+                this.lastTick = (int) (System.currentTimeMillis() / 50);
+
+                ++this.receivedMovePackets;
+                int i = this.receivedMovePackets - this.processedMovePackets;
+                if (i > Math.max(this.allowedPlayerTicks, 5)) {
+                    PlayerConnection.LOGGER.debug(this.player.getName() + " is sending move packets too frequently (" + i + " packets since last tick)");
+                    i = 1;
+                }
+
+                if (d10 > 0) {
+                    allowedPlayerTicks -= 1;
+                } else {
+                    allowedPlayerTicks = 20;
+                }
+                double speed;
+                if (player.abilities.isFlying) {
+                    speed = player.abilities.flySpeed * 20f;
+                } else {
+                    speed = player.abilities.walkSpeed * 10f;
+                }
+                speed *= 2f; // TODO: Get the speed of the vehicle instead of the player
+
+                if (d10 - d9 > Math.max(100.0D, Math.pow((double) (10.0F * (float) i * speed), 2)) && !this.isExemptPlayer()) {
+                // CraftBukkit end
                     PlayerConnection.LOGGER.warn("{} (vehicle of {}) moved too quickly! {},{},{}", entity.getDisplayName().getString(), this.player.getDisplayName().getString(), d6, d7, d8);
                     this.networkManager.sendPacket(new PacketPlayOutVehicleMove(entity));
                     return;
@@ -230,14 +364,72 @@
                 }
 
                 entity.setLocation(d3, d4, d5, f, f1);
+                player.setLocation(d3, d4, d5, this.player.yaw, this.player.pitch); // CraftBukkit
                 boolean flag2 = worldserver.getCubes(entity, entity.getBoundingBox().shrink(0.0625D));
 
                 if (flag && (flag1 || !flag2)) {
                     entity.setLocation(d0, d1, d2, f, f1);
+                    player.setLocation(d0, d1, d2, this.player.yaw, this.player.pitch); // CraftBukkit
                     this.networkManager.sendPacket(new PacketPlayOutVehicleMove(entity));
                     return;
                 }
 
+                // CraftBukkit start - fire PlayerMoveEvent
+                Player player = this.getPlayer();
+                Location from = new Location(player.getWorld(), lastPosX, lastPosY, lastPosZ, lastYaw, lastPitch); // Get the Players previous Event location.
+                Location to = player.getLocation().clone(); // Start off the To location as the Players current location.
+
+                // If the packet contains movement information then we update the To location with the correct XYZ.
+                to.setX(packetplayinvehiclemove.getX());
+                to.setY(packetplayinvehiclemove.getY());
+                to.setZ(packetplayinvehiclemove.getZ());
+
+
+                // If the packet contains look information then we update the To location with the correct Yaw & Pitch.
+                to.setYaw(packetplayinvehiclemove.getYaw());
+                to.setPitch(packetplayinvehiclemove.getPitch());
+
+                // Prevent 40 event-calls for less than a single pixel of movement >.>
+                double delta = Math.pow(this.lastPosX - to.getX(), 2) + Math.pow(this.lastPosY - to.getY(), 2) + Math.pow(this.lastPosZ - to.getZ(), 2);
+                float deltaAngle = Math.abs(this.lastYaw - to.getYaw()) + Math.abs(this.lastPitch - to.getPitch());
+
+                if ((delta > 1f / 256 || deltaAngle > 10f) && !this.player.isFrozen()) {
+                    this.lastPosX = to.getX();
+                    this.lastPosY = to.getY();
+                    this.lastPosZ = to.getZ();
+                    this.lastYaw = to.getYaw();
+                    this.lastPitch = to.getPitch();
+
+                    // Skip the first time we do this
+                    if (from.getX() != Double.MAX_VALUE) {
+                        Location oldTo = to.clone();
+                        PlayerMoveEvent event = new PlayerMoveEvent(player, from, to);
+                        this.server.getPluginManager().callEvent(event);
+
+                        // If the event is cancelled we move the player back to their old location.
+                        if (event.isCancelled()) {
+                            teleport(from);
+                            return;
+                        }
+
+                        // If a Plugin has changed the To destination then we teleport the Player
+                        // there to avoid any 'Moved wrongly' or 'Moved too quickly' errors.
+                        // We only do this if the Event was not cancelled.
+                        if (!oldTo.equals(event.getTo()) && !event.isCancelled()) {
+                            this.player.getBukkitEntity().teleport(event.getTo(), PlayerTeleportEvent.TeleportCause.PLUGIN);
+                            return;
+                        }
+
+                        // Check to see if the Players Location has some how changed during the call of the event.
+                        // This can happen due to a plugin teleporting the player instead of using .setTo()
+                        if (!from.equals(this.getPlayer().getLocation()) && this.justTeleported) {
+                            this.justTeleported = false;
+                            return;
+                        }
+                    }
+                }
+                // CraftBukkit end
+
                 this.player.getWorldServer().getChunkProvider().movePlayer(this.player);
                 this.player.checkMovement(this.player.locX - d0, this.player.locY - d1, this.player.locZ - d2);
                 this.D = d11 >= -0.03125D && !this.minecraftServer.getAllowFlight() && !worldserver.a(entity.getBoundingBox().g(0.0625D).b(0.0D, -0.55D, 0.0D));
@@ -252,7 +444,7 @@
     @Override
     public void a(PacketPlayInTeleportAccept packetplayinteleportaccept) {
         PlayerConnectionUtils.ensureMainThread(packetplayinteleportaccept, this, this.player.getWorldServer());
-        if (packetplayinteleportaccept.b() == this.teleportAwait) {
+        if (packetplayinteleportaccept.b() == this.teleportAwait && this.teleportPos != null) { // CraftBukkit
             this.player.setLocation(this.teleportPos.x, this.teleportPos.y, this.teleportPos.z, this.player.yaw, this.player.pitch);
             this.o = this.teleportPos.x;
             this.p = this.teleportPos.y;
@@ -262,6 +454,7 @@
             }
 
             this.teleportPos = null;
+            this.player.getWorldServer().getChunkProvider().movePlayer(this.player); // CraftBukkit
         }
 
     }
@@ -270,7 +463,7 @@
     public void a(PacketPlayInRecipeDisplayed packetplayinrecipedisplayed) {
         PlayerConnectionUtils.ensureMainThread(packetplayinrecipedisplayed, this, this.player.getWorldServer());
         if (packetplayinrecipedisplayed.b() == PacketPlayInRecipeDisplayed.Status.SHOWN) {
-            Optional optional = this.minecraftServer.getCraftingManager().a(packetplayinrecipedisplayed.c());
+            Optional<? extends IRecipe<?>> optional = this.minecraftServer.getCraftingManager().a(packetplayinrecipedisplayed.c()); // CraftBukkit - decompile error
             RecipeBookServer recipebookserver = this.player.B();
 
             optional.ifPresent(recipebookserver::e);
@@ -304,6 +497,12 @@
     @Override
     public void a(PacketPlayInTabComplete packetplayintabcomplete) {
         PlayerConnectionUtils.ensureMainThread(packetplayintabcomplete, this, this.player.getWorldServer());
+        // CraftBukkit start
+        if (chatSpamField.addAndGet(this, 1) > 500 && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) {
+            this.disconnect(new ChatMessage("disconnect.spam", new Object[0]));
+            return;
+        }
+        // CraftBukkit end
         StringReader stringreader = new StringReader(packetplayintabcomplete.c());
 
         if (stringreader.canRead() && stringreader.peek() == '/') {
@@ -313,7 +512,8 @@
         ParseResults<CommandListenerWrapper> parseresults = this.minecraftServer.getCommandDispatcher().a().parse(stringreader, this.player.getCommandListener());
 
         this.minecraftServer.getCommandDispatcher().a().getCompletionSuggestions(parseresults).thenAccept((suggestions) -> {
-            this.networkManager.sendPacket(new PacketPlayOutTabComplete(packetplayintabcomplete.b(), suggestions));
+            if (((Suggestions) suggestions).isEmpty()) return; // CraftBukkit - don't send through empty suggestions - prevents [<args>] from showing for plugins with nothing more to offer
+            this.networkManager.sendPacket(new PacketPlayOutTabComplete(packetplayintabcomplete.b(), (Suggestions) suggestions)); // CraftBukkit - decompile error
         });
     }
 
@@ -518,6 +718,7 @@
 
         if (container instanceof ContainerMerchant) {
             ContainerMerchant containermerchant = (ContainerMerchant) container;
+            CraftEventFactory.callTradeSelectEvent(this.player, i, containermerchant); // CraftBukkit
 
             containermerchant.d(i);
             containermerchant.g(i);
@@ -527,6 +728,15 @@
 
     @Override
     public void a(PacketPlayInBEdit packetplayinbedit) {
+        // CraftBukkit start
+        PlayerConnectionUtils.ensureMainThread(packetplayinbedit, this, this.player.getWorldServer());
+        if (this.lastBookTick + 20 > MinecraftServer.currentTick) {
+            this.disconnect("Book edited too quickly!");
+            return;
+        }
+        this.lastBookTick = MinecraftServer.currentTick;
+        EnumItemSlot enumitemslot = packetplayinbedit.d() == EnumHand.MAIN_HAND ? EnumItemSlot.MAINHAND : EnumItemSlot.OFFHAND;
+        // CraftBukkit end
         ItemStack itemstack = packetplayinbedit.b();
 
         if (!itemstack.isEmpty()) {
@@ -555,9 +765,11 @@
                         }
 
                         itemstack2.a("pages", (NBTBase) nbttaglist);
-                        this.player.a(packetplayinbedit.d(), itemstack2);
+                        this.player.a(packetplayinbedit.d(), CraftEventFactory.handleEditBookEvent(player, enumitemslot, itemstack1, itemstack2)); // CraftBukkit
                     } else {
+                        ItemStack old = itemstack1.cloneItemStack(); // CraftBukkit
                         itemstack1.a("pages", (NBTBase) itemstack.getTag().getList("pages", 8));
+                        CraftEventFactory.handleEditBookEvent(player, enumitemslot, old, itemstack1); // CraftBukkit
                     }
                 }
 
@@ -599,7 +811,7 @@
         } else {
             WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
 
-            if (!this.player.viewingCredits) {
+            if (!this.player.viewingCredits && !this.player.isFrozen()) { // CraftBukkit
                 if (this.e == 0) {
                     this.syncPosition();
                 }
@@ -609,13 +821,21 @@
                         this.A = this.e;
                         this.a(this.teleportPos.x, this.teleportPos.y, this.teleportPos.z, this.player.yaw, this.player.pitch);
                     }
-
+                    this.allowedPlayerTicks = 20; // CraftBukkit
                 } else {
                     this.A = this.e;
                     if (this.player.isPassenger()) {
                         this.player.setLocation(this.player.locX, this.player.locY, this.player.locZ, packetplayinflying.a(this.player.yaw), packetplayinflying.b(this.player.pitch));
                         this.player.getWorldServer().getChunkProvider().movePlayer(this.player);
+                        this.allowedPlayerTicks = 20; // CraftBukkit
                     } else {
+                        // CraftBukkit - Make sure the move is valid but then reset it for plugins to modify
+                        double prevX = player.locX;
+                        double prevY = player.locY;
+                        double prevZ = player.locZ;
+                        float prevYaw = player.yaw;
+                        float prevPitch = player.pitch;
+                        // CraftBukkit end
                         double d0 = this.player.locX;
                         double d1 = this.player.locY;
                         double d2 = this.player.locZ;
@@ -640,15 +860,33 @@
                             ++this.receivedMovePackets;
                             int i = this.receivedMovePackets - this.processedMovePackets;
 
-                            if (i > 5) {
+                            // CraftBukkit start - handle custom speeds and skipped ticks
+                            this.allowedPlayerTicks += (System.currentTimeMillis() / 50) - this.lastTick;
+                            this.allowedPlayerTicks = Math.max(this.allowedPlayerTicks, 1);
+                            this.lastTick = (int) (System.currentTimeMillis() / 50);
+
+                            if (i > Math.max(this.allowedPlayerTicks, 5)) {
                                 PlayerConnection.LOGGER.debug("{} is sending move packets too frequently ({} packets since last tick)", this.player.getDisplayName().getString(), i);
                                 i = 1;
                             }
 
+                            if (packetplayinflying.hasLook || d11 > 0) {
+                                allowedPlayerTicks -= 1;
+                            } else {
+                                allowedPlayerTicks = 20;
+                            }
+                            double speed;
+                            if (player.abilities.isFlying) {
+                                speed = player.abilities.flySpeed * 20f;
+                            } else {
+                                speed = player.abilities.walkSpeed * 10f;
+                            }
+
                             if (!this.player.H() && (!this.player.getWorldServer().getGameRules().getBoolean(GameRules.DISABLE_ELYTRA_MOVEMENT_CHECK) || !this.player.isGliding())) {
                                 float f2 = this.player.isGliding() ? 300.0F : 100.0F;
 
-                                if (d11 - d10 > (double) (f2 * (float) i) && !this.isExemptPlayer()) {
+                                if (d11 - d10 > Math.max(f2, Math.pow((double) (10.0F * (float) i * speed), 2)) && !this.isExemptPlayer()) {
+                                // CraftBukkit end
                                     PlayerConnection.LOGGER.warn("{} moved too quickly! {},{},{}", this.player.getDisplayName().getString(), d7, d8, d9);
                                     this.a(this.player.locX, this.player.locY, this.player.locZ, this.player.yaw, this.player.pitch);
                                     return;
@@ -694,6 +932,69 @@
                                 }
                             }
 
+                            // CraftBukkit start - fire PlayerMoveEvent
+                            // Rest to old location first
+                            this.player.setLocation(prevX, prevY, prevZ, prevYaw, prevPitch);
+
+                            Player player = this.getPlayer();
+                            Location from = new Location(player.getWorld(), lastPosX, lastPosY, lastPosZ, lastYaw, lastPitch); // Get the Players previous Event location.
+                            Location to = player.getLocation().clone(); // Start off the To location as the Players current location.
+
+                            // If the packet contains movement information then we update the To location with the correct XYZ.
+                            if (packetplayinflying.hasPos) {
+                                to.setX(packetplayinflying.x);
+                                to.setY(packetplayinflying.y);
+                                to.setZ(packetplayinflying.z);
+                            }
+
+                            // If the packet contains look information then we update the To location with the correct Yaw & Pitch.
+                            if (packetplayinflying.hasLook) {
+                                to.setYaw(packetplayinflying.yaw);
+                                to.setPitch(packetplayinflying.pitch);
+                            }
+
+                            // Prevent 40 event-calls for less than a single pixel of movement >.>
+                            double delta = Math.pow(this.lastPosX - to.getX(), 2) + Math.pow(this.lastPosY - to.getY(), 2) + Math.pow(this.lastPosZ - to.getZ(), 2);
+                            float deltaAngle = Math.abs(this.lastYaw - to.getYaw()) + Math.abs(this.lastPitch - to.getPitch());
+
+                            if ((delta > 1f / 256 || deltaAngle > 10f) && !this.player.isFrozen()) {
+                                this.lastPosX = to.getX();
+                                this.lastPosY = to.getY();
+                                this.lastPosZ = to.getZ();
+                                this.lastYaw = to.getYaw();
+                                this.lastPitch = to.getPitch();
+
+                                // Skip the first time we do this
+                                if (from.getX() != Double.MAX_VALUE) {
+                                    Location oldTo = to.clone();
+                                    PlayerMoveEvent event = new PlayerMoveEvent(player, from, to);
+                                    this.server.getPluginManager().callEvent(event);
+
+                                    // If the event is cancelled we move the player back to their old location.
+                                    if (event.isCancelled()) {
+                                        teleport(from);
+                                        return;
+                                    }
+
+                                    // If a Plugin has changed the To destination then we teleport the Player
+                                    // there to avoid any 'Moved wrongly' or 'Moved too quickly' errors.
+                                    // We only do this if the Event was not cancelled.
+                                    if (!oldTo.equals(event.getTo()) && !event.isCancelled()) {
+                                        this.player.getBukkitEntity().teleport(event.getTo(), PlayerTeleportEvent.TeleportCause.PLUGIN);
+                                        return;
+                                    }
+
+                                    // Check to see if the Players Location has some how changed during the call of the event.
+                                    // This can happen due to a plugin teleporting the player instead of using .setTo()
+                                    if (!from.equals(this.getPlayer().getLocation()) && this.justTeleported) {
+                                        this.justTeleported = false;
+                                        return;
+                                    }
+                                }
+                            }
+                            this.player.setLocation(d4, d5, d6, f, f1); // Copied from above
+                            // CraftBukkit end
+
                             this.B = d12 >= -0.03125D && this.player.playerInteractManager.getGameMode() != EnumGamemode.SPECTATOR && !this.minecraftServer.getAllowFlight() && !this.player.abilities.canFly && !this.player.hasEffect(MobEffects.LEVITATION) && !this.player.isGliding() && !worldserver.a(this.player.getBoundingBox().g(0.0625D).b(0.0D, -0.55D, 0.0D));
                             this.player.onGround = packetplayinflying.b();
                             this.player.getWorldServer().getChunkProvider().movePlayer(this.player);
@@ -713,10 +1014,66 @@
     }
 
     public void a(double d0, double d1, double d2, float f, float f1) {
-        this.a(d0, d1, d2, f, f1, Collections.emptySet());
+        this.a(d0, d1, d2, f, f1, Collections.<PacketPlayOutPosition.EnumPlayerTeleportFlags>emptySet());
+    }
+
+    // CraftBukkit start - Delegate to teleport(Location)
+    public void a(double d0, double d1, double d2, float f, float f1, PlayerTeleportEvent.TeleportCause cause) {
+        this.a(d0, d1, d2, f, f1, Collections.<PacketPlayOutPosition.EnumPlayerTeleportFlags>emptySet(), cause);
     }
 
     public void a(double d0, double d1, double d2, float f, float f1, Set<PacketPlayOutPosition.EnumPlayerTeleportFlags> set) {
+        this.a(d0, d1, d2, f, f1, set, PlayerTeleportEvent.TeleportCause.UNKNOWN);
+    }
+
+    public void a(double d0, double d1, double d2, float f, float f1, Set<PacketPlayOutPosition.EnumPlayerTeleportFlags> set, PlayerTeleportEvent.TeleportCause cause) {
+        Player player = this.getPlayer();
+        Location from = player.getLocation();
+
+        double x = d0;
+        double y = d1;
+        double z = d2;
+        float yaw = f;
+        float pitch = f1;
+
+        Location to = new Location(this.getPlayer().getWorld(), x, y, z, yaw, pitch);
+        // SPIGOT-5171: Triggered on join
+        if (from.equals(to)) {
+            this.internalTeleport(d0, d1, d2, f, f1, set);
+            return;
+        }
+
+        PlayerTeleportEvent event = new PlayerTeleportEvent(player, from.clone(), to.clone(), cause);
+        this.server.getPluginManager().callEvent(event);
+
+        if (event.isCancelled() || !to.equals(event.getTo())) {
+            set.clear(); // Can't relative teleport
+            to = event.isCancelled() ? event.getFrom() : event.getTo();
+            d0 = to.getX();
+            d1 = to.getY();
+            d2 = to.getZ();
+            f = to.getYaw();
+            f1 = to.getPitch();
+        }
+
+        this.internalTeleport(d0, d1, d2, f, f1, set);
+    }
+
+    public void teleport(Location dest) {
+        internalTeleport(dest.getX(), dest.getY(), dest.getZ(), dest.getYaw(), dest.getPitch(), Collections.<PacketPlayOutPosition.EnumPlayerTeleportFlags>emptySet());
+    }
+
+    private void internalTeleport(double d0, double d1, double d2, float f, float f1, Set<PacketPlayOutPosition.EnumPlayerTeleportFlags> set) {
+        // CraftBukkit start
+        if (Float.isNaN(f)) {
+            f = 0;
+        }
+        if (Float.isNaN(f1)) {
+            f1 = 0;
+        }
+
+        this.justTeleported = true;
+        // CraftBukkit end
         double d3 = set.contains(PacketPlayOutPosition.EnumPlayerTeleportFlags.X) ? this.player.locX : 0.0D;
         double d4 = set.contains(PacketPlayOutPosition.EnumPlayerTeleportFlags.Y) ? this.player.locY : 0.0D;
         double d5 = set.contains(PacketPlayOutPosition.EnumPlayerTeleportFlags.Z) ? this.player.locZ : 0.0D;
@@ -728,6 +1085,14 @@
             this.teleportAwait = 0;
         }
 
+        // CraftBukkit start - update last location
+        this.lastPosX = this.teleportPos.x;
+        this.lastPosY = this.teleportPos.y;
+        this.lastPosZ = this.teleportPos.z;
+        this.lastYaw = f;
+        this.lastPitch = f1;
+        // CraftBukkit end
+
         this.A = this.e;
         this.player.setLocation(d0, d1, d2, f, f1);
         this.player.playerConnection.sendPacket(new PacketPlayOutPosition(d0 - d3, d1 - d4, d2 - d5, f - f2, f1 - f3, set, this.teleportAwait));
@@ -736,6 +1101,7 @@
     @Override
     public void a(PacketPlayInBlockDig packetplayinblockdig) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockdig, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         BlockPosition blockposition = packetplayinblockdig.b();
 
         this.player.resetIdleTimer();
@@ -746,13 +1112,45 @@
                 if (!this.player.isSpectator()) {
                     ItemStack itemstack = this.player.b(EnumHand.OFF_HAND);
 
-                    this.player.a(EnumHand.OFF_HAND, this.player.b(EnumHand.MAIN_HAND));
-                    this.player.a(EnumHand.MAIN_HAND, itemstack);
+                    // CraftBukkit start - inspiration taken from DispenserRegistry (See SpigotCraft#394)
+                    CraftItemStack mainHand = CraftItemStack.asCraftMirror(itemstack);
+                    CraftItemStack offHand = CraftItemStack.asCraftMirror(this.player.b(EnumHand.MAIN_HAND));
+                    PlayerSwapHandItemsEvent swapItemsEvent = new PlayerSwapHandItemsEvent(getPlayer(), mainHand.clone(), offHand.clone());
+                    this.server.getPluginManager().callEvent(swapItemsEvent);
+                    if (swapItemsEvent.isCancelled()) {
+                        return;
+                    }
+                    if (swapItemsEvent.getOffHandItem().equals(offHand)) {
+                        this.player.a(EnumHand.OFF_HAND, this.player.b(EnumHand.MAIN_HAND));
+                    } else {
+                        this.player.a(EnumHand.OFF_HAND, CraftItemStack.asNMSCopy(swapItemsEvent.getOffHandItem()));
+                    }
+                    if (swapItemsEvent.getMainHandItem().equals(mainHand)) {
+                        this.player.a(EnumHand.MAIN_HAND, itemstack);
+                    } else {
+                        this.player.a(EnumHand.MAIN_HAND, CraftItemStack.asNMSCopy(swapItemsEvent.getMainHandItem()));
+                    }
+                    // CraftBukkit end
                 }
 
                 return;
             case DROP_ITEM:
                 if (!this.player.isSpectator()) {
+                    // limit how quickly items can be dropped
+                    // If the ticks aren't the same then the count starts from 0 and we update the lastDropTick.
+                    if (this.lastDropTick != MinecraftServer.currentTick) {
+                        this.dropCount = 0;
+                        this.lastDropTick = MinecraftServer.currentTick;
+                    } else {
+                        // Else we increment the drop count and check the amount.
+                        this.dropCount++;
+                        if (this.dropCount >= 20) {
+                            LOGGER.warn(this.player.getName() + " dropped their items too quickly!");
+                            this.disconnect("You dropped your items too quickly (Hacking?)");
+                            return;
+                        }
+                    }
+                    // CraftBukkit end
                     this.player.n(false);
                 }
 
@@ -779,6 +1177,7 @@
     @Override
     public void a(PacketPlayInUseItem packetplayinuseitem) {
         PlayerConnectionUtils.ensureMainThread(packetplayinuseitem, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
         EnumHand enumhand = packetplayinuseitem.b();
         ItemStack itemstack = this.player.b(enumhand);
@@ -792,6 +1191,14 @@
 
             this.player.playerConnection.sendPacket(new PacketPlayOutChat(ichatbasecomponent, ChatMessageType.GAME_INFO));
         } else if (this.teleportPos == null && this.player.e((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D) < 64.0D && worldserver.a((EntityHuman) this.player, blockposition)) {
+            // CraftBukkit start - Check if we can actually do something over this large a distance
+            Location eyeLoc = this.getPlayer().getEyeLocation();
+            double reachDistance = NumberConversions.square(eyeLoc.getX() - blockposition.getX()) + NumberConversions.square(eyeLoc.getY() - blockposition.getY()) + NumberConversions.square(eyeLoc.getZ() - blockposition.getZ());
+            if (reachDistance > (this.getPlayer().getGameMode() == org.bukkit.GameMode.CREATIVE ? CREATIVE_PLACE_DISTANCE_SQUARED : SURVIVAL_PLACE_DISTANCE_SQUARED)) {
+                return;
+            }
+            this.player.clearActiveItem(); // SPIGOT-4706
+            // CraftBukkit end
             this.player.playerInteractManager.a(this.player, worldserver, itemstack, enumhand, movingobjectpositionblock);
         }
 
@@ -802,13 +1209,53 @@
     @Override
     public void a(PacketPlayInBlockPlace packetplayinblockplace) {
         PlayerConnectionUtils.ensureMainThread(packetplayinblockplace, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
         EnumHand enumhand = packetplayinblockplace.b();
         ItemStack itemstack = this.player.b(enumhand);
 
         this.player.resetIdleTimer();
         if (!itemstack.isEmpty()) {
-            this.player.playerInteractManager.a(this.player, worldserver, itemstack, enumhand);
+            // CraftBukkit start
+            // Raytrace to look for 'rogue armswings'
+            float f1 = this.player.pitch;
+            float f2 = this.player.yaw;
+            double d0 = this.player.locX;
+            double d1 = this.player.locY + (double) this.player.getHeadHeight();
+            double d2 = this.player.locZ;
+            Vec3D vec3d = new Vec3D(d0, d1, d2);
+
+            float f3 = MathHelper.cos(-f2 * 0.017453292F - 3.1415927F);
+            float f4 = MathHelper.sin(-f2 * 0.017453292F - 3.1415927F);
+            float f5 = -MathHelper.cos(-f1 * 0.017453292F);
+            float f6 = MathHelper.sin(-f1 * 0.017453292F);
+            float f7 = f4 * f5;
+            float f8 = f3 * f5;
+            double d3 = player.playerInteractManager.getGameMode()== EnumGamemode.CREATIVE ? 5.0D : 4.5D;
+            Vec3D vec3d1 = vec3d.add((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
+            MovingObjectPosition movingobjectposition = this.player.world.rayTrace(new RayTrace(vec3d, vec3d1, RayTrace.BlockCollisionOption.OUTLINE, RayTrace.FluidCollisionOption.NONE, player));
+
+            boolean cancelled;
+            if (movingobjectposition == null || movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.BLOCK) {
+                org.bukkit.event.player.PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.RIGHT_CLICK_AIR, itemstack, enumhand);
+                cancelled = event.useItemInHand() == Event.Result.DENY;
+            } else {
+                if (player.playerInteractManager.firedInteract) {
+                    player.playerInteractManager.firedInteract = false;
+                    cancelled = player.playerInteractManager.interactResult;
+                } else {
+                    MovingObjectPositionBlock movingobjectpositionblock = (MovingObjectPositionBlock) movingobjectposition;
+                    org.bukkit.event.player.PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(player, Action.RIGHT_CLICK_BLOCK, movingobjectpositionblock.getBlockPosition(), movingobjectpositionblock.getDirection(), itemstack, true, enumhand);
+                    cancelled = event.useItemInHand() == Event.Result.DENY;
+                }
+            }
+
+            if (cancelled) {
+                this.player.getBukkitEntity().updateInventory(); // SPIGOT-2524
+            } else {
+                this.player.playerInteractManager.a(this.player, worldserver, itemstack, enumhand);
+            }
+            // CraftBukkit end
         }
     }
 
@@ -823,7 +1270,7 @@
                 Entity entity = packetplayinspectate.a(worldserver);
 
                 if (entity != null) {
-                    this.player.a(worldserver, entity.locX, entity.locY, entity.locZ, entity.yaw, entity.pitch);
+                    this.player.a(worldserver, entity.locX, entity.locY, entity.locZ, entity.yaw, entity.pitch, org.bukkit.event.player.PlayerTeleportEvent.TeleportCause.SPECTATE); // CraftBukkit
                     return;
                 }
             }
@@ -832,7 +1279,12 @@
     }
 
     @Override
-    public void a(PacketPlayInResourcePackStatus packetplayinresourcepackstatus) {}
+    // CraftBukkit start
+    public void a(PacketPlayInResourcePackStatus packetplayinresourcepackstatus) {
+        PlayerConnectionUtils.ensureMainThread(packetplayinresourcepackstatus, this, this.player.getWorldServer());
+        this.server.getPluginManager().callEvent(new PlayerResourcePackStatusEvent(getPlayer(), PlayerResourcePackStatusEvent.Status.values()[packetplayinresourcepackstatus.status.ordinal()]));
+    }
+    // CraftBukkit end
 
     @Override
     public void a(PacketPlayInBoatMove packetplayinboatmove) {
@@ -847,11 +1299,26 @@
 
     @Override
     public void a(IChatBaseComponent ichatbasecomponent) {
+        // CraftBukkit start - Rarely it would send a disconnect line twice
+        if (this.processedDisconnect) {
+            return;
+        } else {
+            this.processedDisconnect = true;
+        }
+        // CraftBukkit end
         PlayerConnection.LOGGER.info("{} lost connection: {}", this.player.getDisplayName().getString(), ichatbasecomponent.getString());
+        // CraftBukkit start - Replace vanilla quit message handling with our own.
+        /*
         this.minecraftServer.invalidatePingSample();
         this.minecraftServer.getPlayerList().sendMessage((new ChatMessage("multiplayer.player.left", new Object[]{this.player.getScoreboardDisplayName()})).a(EnumChatFormat.YELLOW));
+        */
+
         this.player.n();
-        this.minecraftServer.getPlayerList().disconnect(this.player);
+        String quitMessage = this.minecraftServer.getPlayerList().disconnect(this.player);
+        if ((quitMessage != null) && (quitMessage.length() > 0)) {
+            this.minecraftServer.getPlayerList().sendMessage(CraftChatMessage.fromString(quitMessage));
+        }
+        // CraftBukkit end
         if (this.isExemptPlayer()) {
             PlayerConnection.LOGGER.info("Stopping singleplayer server as player logged out");
             this.minecraftServer.safeShutdown(false);
@@ -877,6 +1344,15 @@
             }
         }
 
+        // CraftBukkit start
+        if (packet == null) {
+            return;
+        } else if (packet instanceof PacketPlayOutSpawnPosition) {
+            PacketPlayOutSpawnPosition packet6 = (PacketPlayOutSpawnPosition) packet;
+            this.player.compassTarget = new Location(this.getPlayer().getWorld(), packet6.position.getX(), packet6.position.getY(), packet6.position.getZ());
+        }
+        // CraftBukkit end
+
         try {
             this.networkManager.sendPacket(packet, genericfuturelistener);
         } catch (Throwable throwable) {
@@ -893,18 +1369,38 @@
     @Override
     public void a(PacketPlayInHeldItemSlot packetplayinhelditemslot) {
         PlayerConnectionUtils.ensureMainThread(packetplayinhelditemslot, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         if (packetplayinhelditemslot.b() >= 0 && packetplayinhelditemslot.b() < PlayerInventory.getHotbarSize()) {
+            PlayerItemHeldEvent event = new PlayerItemHeldEvent(this.getPlayer(), this.player.inventory.itemInHandIndex, packetplayinhelditemslot.b());
+            this.server.getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                this.sendPacket(new PacketPlayOutHeldItemSlot(this.player.inventory.itemInHandIndex));
+                this.player.resetIdleTimer();
+                return;
+            }
+            // CraftBukkit end
             this.player.inventory.itemInHandIndex = packetplayinhelditemslot.b();
             this.player.resetIdleTimer();
         } else {
             PlayerConnection.LOGGER.warn("{} tried to set an invalid carried item", this.player.getDisplayName().getString());
+            this.disconnect("Invalid hotbar selection (Hacking?)"); // CraftBukkit
         }
     }
 
     @Override
     public void a(PacketPlayInChat packetplayinchat) {
-        PlayerConnectionUtils.ensureMainThread(packetplayinchat, this, this.player.getWorldServer());
-        if (this.player.getChatFlags() == EnumChatVisibility.HIDDEN) {
+        // CraftBukkit start - async chat
+        // SPIGOT-3638
+        if (this.minecraftServer.isStopped()) {
+            return;
+        }
+
+        boolean isSync = packetplayinchat.b().startsWith("/");
+        if (packetplayinchat.b().startsWith("/")) {
+            PlayerConnectionUtils.ensureMainThread(packetplayinchat, this, this.player.getWorldServer());
+        }
+        // CraftBukkit end
+        if (this.player.dead || this.player.getChatFlags() == EnumChatVisibility.HIDDEN) { // CraftBukkit - dead men tell no tales
             this.sendPacket(new PacketPlayOutChat((new ChatMessage("chat.cannotSend", new Object[0])).a(EnumChatFormat.RED)));
         } else {
             this.player.resetIdleTimer();
@@ -914,41 +1410,257 @@
 
             for (int i = 0; i < s.length(); ++i) {
                 if (!SharedConstants.isAllowedChatCharacter(s.charAt(i))) {
-                    this.disconnect(new ChatMessage("multiplayer.disconnect.illegal_characters", new Object[0]));
+                    // CraftBukkit start - threadsafety
+                    if (!isSync) {
+                        Waitable waitable = new Waitable() {
+                            @Override
+                            protected Object evaluate() {
+                                PlayerConnection.this.disconnect(new ChatMessage("multiplayer.disconnect.illegal_characters", new Object[0]));
+                                return null;
+                            }
+                        };
+
+                        this.minecraftServer.processQueue.add(waitable);
+
+                        try {
+                            waitable.get();
+                        } catch (InterruptedException e) {
+                            Thread.currentThread().interrupt();
+                        } catch (ExecutionException e) {
+                            throw new RuntimeException(e);
+                        }
+                    } else {
+                        this.disconnect(new ChatMessage("multiplayer.disconnect.illegal_characters", new Object[0]));
+                    }
+                    // CraftBukkit end
                     return;
                 }
             }
 
-            if (s.startsWith("/")) {
-                this.handleCommand(s);
+            // CraftBukkit start
+            if (isSync) {
+                try {
+                    this.minecraftServer.server.playerCommandState = true;
+                    this.handleCommand(s);
+                } finally {
+                    this.minecraftServer.server.playerCommandState = false;
+                }
+            } else if (s.isEmpty()) {
+                LOGGER.warn(this.player.getName() + " tried to send an empty message");
+            } else if (getPlayer().isConversing()) {
+                final String conversationInput = s;
+                this.minecraftServer.processQueue.add(new Runnable() {
+                    @Override
+                    public void run() {
+                        getPlayer().acceptConversationInput(conversationInput);
+                    }
+                });
+            } else if (this.player.getChatFlags() == EnumChatVisibility.SYSTEM) { // Re-add "Command Only" flag check
+                ChatMessage chatmessage = new ChatMessage("chat.cannotSend", new Object[0]);
+
+                chatmessage.getChatModifier().setColor(EnumChatFormat.RED);
+                this.sendPacket(new PacketPlayOutChat(chatmessage));
+            } else if (true) {
+                this.chat(s, true);
+                // CraftBukkit end - the below is for reference. :)
             } else {
                 ChatMessage chatmessage = new ChatMessage("chat.type.text", new Object[]{this.player.getScoreboardDisplayName(), s});
 
                 this.minecraftServer.getPlayerList().sendMessage(chatmessage, false);
             }
 
-            this.chatThrottle += 20;
-            if (this.chatThrottle > 200 && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) {
-                this.disconnect(new ChatMessage("disconnect.spam", new Object[0]));
+            // CraftBukkit start - replaced with thread safe throttle
+            // this.chatThrottle += 20;
+            if (chatSpamField.addAndGet(this, 20) > 200 && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) {
+                if (!isSync) {
+                    Waitable waitable = new Waitable() {
+                        @Override
+                        protected Object evaluate() {
+                            PlayerConnection.this.disconnect(new ChatMessage("disconnect.spam", new Object[0]));
+                            return null;
+                        }
+                    };
+
+                    this.minecraftServer.processQueue.add(waitable);
+
+                    try {
+                        waitable.get();
+                    } catch (InterruptedException e) {
+                        Thread.currentThread().interrupt();
+                    } catch (ExecutionException e) {
+                        throw new RuntimeException(e);
+                    }
+                } else {
+                    this.disconnect(new ChatMessage("disconnect.spam", new Object[0]));
+                }
+                // CraftBukkit end
             }
 
         }
     }
 
+    // CraftBukkit start - add method
+    public void chat(String s, boolean async) {
+        if (s.isEmpty() || this.player.getChatFlags() == EnumChatVisibility.HIDDEN) {
+            return;
+        }
+
+        if (!async && s.startsWith("/")) {
+            this.handleCommand(s);
+        } else if (this.player.getChatFlags() == EnumChatVisibility.SYSTEM) {
+            // Do nothing, this is coming from a plugin
+        } else {
+            Player player = this.getPlayer();
+            AsyncPlayerChatEvent event = new AsyncPlayerChatEvent(async, player, s, new LazyPlayerSet(minecraftServer));
+            this.server.getPluginManager().callEvent(event);
+
+            if (PlayerChatEvent.getHandlerList().getRegisteredListeners().length != 0) {
+                // Evil plugins still listening to deprecated event
+                final PlayerChatEvent queueEvent = new PlayerChatEvent(player, event.getMessage(), event.getFormat(), event.getRecipients());
+                queueEvent.setCancelled(event.isCancelled());
+                Waitable waitable = new Waitable() {
+                    @Override
+                    protected Object evaluate() {
+                        org.bukkit.Bukkit.getPluginManager().callEvent(queueEvent);
+
+                        if (queueEvent.isCancelled()) {
+                            return null;
+                        }
+
+                        String message = String.format(queueEvent.getFormat(), queueEvent.getPlayer().getDisplayName(), queueEvent.getMessage());
+                        PlayerConnection.this.minecraftServer.console.sendMessage(message);
+                        if (((LazyPlayerSet) queueEvent.getRecipients()).isLazy()) {
+                            for (Object player : PlayerConnection.this.minecraftServer.getPlayerList().players) {
+                                ((EntityPlayer) player).sendMessage(CraftChatMessage.fromString(message));
+                            }
+                        } else {
+                            for (Player player : queueEvent.getRecipients()) {
+                                player.sendMessage(message);
+                            }
+                        }
+                        return null;
+                    }};
+                if (async) {
+                    minecraftServer.processQueue.add(waitable);
+                } else {
+                    waitable.run();
+                }
+                try {
+                    waitable.get();
+                } catch (InterruptedException e) {
+                    Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
+                } catch (ExecutionException e) {
+                    throw new RuntimeException("Exception processing chat event", e.getCause());
+                }
+            } else {
+                if (event.isCancelled()) {
+                    return;
+                }
+
+                s = String.format(event.getFormat(), event.getPlayer().getDisplayName(), event.getMessage());
+                minecraftServer.console.sendMessage(s);
+                if (((LazyPlayerSet) event.getRecipients()).isLazy()) {
+                    for (Object recipient : minecraftServer.getPlayerList().players) {
+                        ((EntityPlayer) recipient).sendMessage(CraftChatMessage.fromString(s));
+                    }
+                } else {
+                    for (Player recipient : event.getRecipients()) {
+                        recipient.sendMessage(s);
+                    }
+                }
+            }
+        }
+    }
+    // CraftBukkit end
+
     private void handleCommand(String s) {
-        this.minecraftServer.getCommandDispatcher().a(this.player.getCommandListener(), s);
+        // CraftBukkit start - whole method
+        this.LOGGER.info(this.player.getName() + " issued server command: " + s);
+
+        CraftPlayer player = this.getPlayer();
+
+        PlayerCommandPreprocessEvent event = new PlayerCommandPreprocessEvent(player, s, new LazyPlayerSet(minecraftServer));
+        this.server.getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) {
+            return;
+        }
+
+        try {
+            if (this.server.dispatchCommand(event.getPlayer(), event.getMessage().substring(1))) {
+                return;
+            }
+        } catch (org.bukkit.command.CommandException ex) {
+            player.sendMessage(org.bukkit.ChatColor.RED + "An internal error occurred while attempting to perform this command");
+            java.util.logging.Logger.getLogger(PlayerConnection.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+            return;
+        }
+        // this.minecraftServer.getCommandDispatcher().a(this.player.getCommandListener(), s);
+        // CraftBukkit end
     }
 
     @Override
     public void a(PacketPlayInArmAnimation packetplayinarmanimation) {
         PlayerConnectionUtils.ensureMainThread(packetplayinarmanimation, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         this.player.resetIdleTimer();
+        // CraftBukkit start - Raytrace to look for 'rogue armswings'
+        float f1 = this.player.pitch;
+        float f2 = this.player.yaw;
+        double d0 = this.player.locX;
+        double d1 = this.player.locY + (double) this.player.getHeadHeight();
+        double d2 = this.player.locZ;
+        Vec3D vec3d = new Vec3D(d0, d1, d2);
+
+        float f3 = MathHelper.cos(-f2 * 0.017453292F - 3.1415927F);
+        float f4 = MathHelper.sin(-f2 * 0.017453292F - 3.1415927F);
+        float f5 = -MathHelper.cos(-f1 * 0.017453292F);
+        float f6 = MathHelper.sin(-f1 * 0.017453292F);
+        float f7 = f4 * f5;
+        float f8 = f3 * f5;
+        double d3 = player.playerInteractManager.getGameMode()== EnumGamemode.CREATIVE ? 5.0D : 4.5D;
+        Vec3D vec3d1 = vec3d.add((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
+        MovingObjectPosition movingobjectposition = this.player.world.rayTrace(new RayTrace(vec3d, vec3d1, RayTrace.BlockCollisionOption.OUTLINE, RayTrace.FluidCollisionOption.NONE, player));
+
+        if (movingobjectposition == null || movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.BLOCK) {
+            CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_AIR, this.player.inventory.getItemInHand(), EnumHand.MAIN_HAND);
+        }
+
+        // Arm swing animation
+        PlayerAnimationEvent event = new PlayerAnimationEvent(this.getPlayer());
+        this.server.getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) return;
+        // CraftBukkit end
         this.player.a(packetplayinarmanimation.b());
     }
 
     @Override
     public void a(PacketPlayInEntityAction packetplayinentityaction) {
         PlayerConnectionUtils.ensureMainThread(packetplayinentityaction, this, this.player.getWorldServer());
+        // CraftBukkit start
+        if (this.player.dead) return;
+        switch (packetplayinentityaction.c()) {
+            case START_SNEAKING:
+            case STOP_SNEAKING:
+                PlayerToggleSneakEvent event = new PlayerToggleSneakEvent(this.getPlayer(), packetplayinentityaction.c() == PacketPlayInEntityAction.EnumPlayerAction.START_SNEAKING);
+                this.server.getPluginManager().callEvent(event);
+
+                if (event.isCancelled()) {
+                    return;
+                }
+                break;
+            case START_SPRINTING:
+            case STOP_SPRINTING:
+                PlayerToggleSprintEvent e2 = new PlayerToggleSprintEvent(this.getPlayer(), packetplayinentityaction.c() == PacketPlayInEntityAction.EnumPlayerAction.START_SPRINTING);
+                this.server.getPluginManager().callEvent(e2);
+
+                if (e2.isCancelled()) {
+                    return;
+                }
+                break;
+        }
+        // CraftBukkit end
         this.player.resetIdleTimer();
         IJumpable ijumpable;
 
@@ -1012,6 +1724,7 @@
     @Override
     public void a(PacketPlayInUseEntity packetplayinuseentity) {
         PlayerConnectionUtils.ensureMainThread(packetplayinuseentity, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
         Entity entity = packetplayinuseentity.a((World) worldserver);
 
@@ -1027,20 +1740,74 @@
             if (this.player.h(entity) < d0) {
                 EnumHand enumhand;
 
+                ItemStack itemInHand = this.player.b(packetplayinuseentity.c() == null ? EnumHand.MAIN_HAND : packetplayinuseentity.c()); // CraftBukkit
+
+                if (packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT
+                        || packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT_AT) {
+                    // CraftBukkit start
+                    boolean triggerLeashUpdate = itemInHand != null && itemInHand.getItem() == Items.LEAD && entity instanceof EntityInsentient;
+                    Item origItem = this.player.inventory.getItemInHand() == null ? null : this.player.inventory.getItemInHand().getItem();
+                    PlayerInteractEntityEvent event;
+                    if (packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT) {
+                        event = new PlayerInteractEntityEvent((Player) this.getPlayer(), entity.getBukkitEntity(), (packetplayinuseentity.c() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
+                    } else {
+                        Vec3D target = packetplayinuseentity.d();
+                        event = new PlayerInteractAtEntityEvent((Player) this.getPlayer(), entity.getBukkitEntity(), new org.bukkit.util.Vector(target.x, target.y, target.z), (packetplayinuseentity.c() == EnumHand.OFF_HAND) ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND);
+                    }
+                    this.server.getPluginManager().callEvent(event);
+
+                    // Fish bucket - SPIGOT-4048
+                    if ((entity instanceof EntityFish && origItem != null && origItem.getItem() == Items.WATER_BUCKET) && (event.isCancelled() || this.player.inventory.getItemInHand() == null || this.player.inventory.getItemInHand().getItem() != origItem)) {
+                        this.sendPacket(new PacketPlayOutSpawnEntityLiving((EntityFish) entity));
+                        this.player.updateInventory(this.player.activeContainer);
+                    }
+
+                    if (triggerLeashUpdate && (event.isCancelled() || this.player.inventory.getItemInHand() == null || this.player.inventory.getItemInHand().getItem() != origItem)) {
+                        // Refresh the current leash state
+                        this.sendPacket(new PacketPlayOutAttachEntity(entity, ((EntityInsentient) entity).getLeashHolder()));
+                    }
+
+                    if (event.isCancelled() || this.player.inventory.getItemInHand() == null || this.player.inventory.getItemInHand().getItem() != origItem) {
+                        // Refresh the current entity metadata
+                        this.sendPacket(new PacketPlayOutEntityMetadata(entity.getId(), entity.datawatcher, true));
+                    }
+
+                    if (event.isCancelled()) {
+                        return;
+                    }
+                    // CraftBukkit end
+                }
+
                 if (packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT) {
                     enumhand = packetplayinuseentity.c();
                     this.player.a(entity, enumhand);
+                    // CraftBukkit start
+                    if (!itemInHand.isEmpty() && itemInHand.getCount() <= -1) {
+                        this.player.updateInventory(this.player.activeContainer);
+                    }
+                    // CraftBukkit end
                 } else if (packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.INTERACT_AT) {
                     enumhand = packetplayinuseentity.c();
                     entity.a((EntityHuman) this.player, packetplayinuseentity.d(), enumhand);
+                    // CraftBukkit start
+                    if (!itemInHand.isEmpty() && itemInHand.getCount() <= -1) {
+                        this.player.updateInventory(this.player.activeContainer);
+                    }
+                    // CraftBukkit end
                 } else if (packetplayinuseentity.b() == PacketPlayInUseEntity.EnumEntityUseAction.ATTACK) {
-                    if (entity instanceof EntityItem || entity instanceof EntityExperienceOrb || entity instanceof EntityArrow || entity == this.player) {
+                    if (entity instanceof EntityItem || entity instanceof EntityExperienceOrb || entity instanceof EntityArrow || (entity == this.player && !player.isSpectator())) { // CraftBukkit
                         this.disconnect(new ChatMessage("multiplayer.disconnect.invalid_entity_attacked", new Object[0]));
                         this.minecraftServer.warning("Player " + this.player.getDisplayName().getString() + " tried to attack an invalid entity");
                         return;
                     }
 
                     this.player.attack(entity);
+
+                    // CraftBukkit start
+                    if (!itemInHand.isEmpty() && itemInHand.getCount() <= -1) {
+                        this.player.updateInventory(this.player.activeContainer);
+                    }
+                    // CraftBukkit end
                 }
             }
         }
@@ -1080,15 +1847,21 @@
     @Override
     public void a(PacketPlayInCloseWindow packetplayinclosewindow) {
         PlayerConnectionUtils.ensureMainThread(packetplayinclosewindow, this, this.player.getWorldServer());
+
+        if (this.player.isFrozen()) return; // CraftBukkit
+        CraftEventFactory.handleInventoryCloseEvent(this.player); // CraftBukkit
+
         this.player.m();
     }
 
     @Override
     public void a(PacketPlayInWindowClick packetplayinwindowclick) {
         PlayerConnectionUtils.ensureMainThread(packetplayinwindowclick, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         this.player.resetIdleTimer();
-        if (this.player.activeContainer.windowId == packetplayinwindowclick.b() && this.player.activeContainer.c(this.player)) {
-            if (this.player.isSpectator()) {
+        if (this.player.activeContainer.windowId == packetplayinwindowclick.b() && this.player.activeContainer.c(this.player) && this.player.activeContainer.canUse(this.player)) { // CraftBukkit
+            boolean cancelled = this.player.isSpectator(); // CraftBukkit - see below if
+            if (false/*this.player.isSpectator()*/) { // CraftBukkit
                 NonNullList<ItemStack> nonnulllist = NonNullList.a();
 
                 for (int i = 0; i < this.player.activeContainer.slots.size(); ++i) {
@@ -1097,8 +1870,274 @@
 
                 this.player.a(this.player.activeContainer, nonnulllist);
             } else {
-                ItemStack itemstack = this.player.activeContainer.a(packetplayinwindowclick.c(), packetplayinwindowclick.d(), packetplayinwindowclick.g(), this.player);
+                // CraftBukkit start - Call InventoryClickEvent
+                if (packetplayinwindowclick.c() < -1 && packetplayinwindowclick.c() != -999) {
+                    return;
+                }
+
+                InventoryView inventory = this.player.activeContainer.getBukkitView();
+                SlotType type = inventory.getSlotType(packetplayinwindowclick.c());
+
+                InventoryClickEvent event;
+                ClickType click = ClickType.UNKNOWN;
+                InventoryAction action = InventoryAction.UNKNOWN;
+
+                ItemStack itemstack = ItemStack.a;
+
+                switch (packetplayinwindowclick.g()) {
+                    case PICKUP:
+                        if (packetplayinwindowclick.d() == 0) {
+                            click = ClickType.LEFT;
+                        } else if (packetplayinwindowclick.d() == 1) {
+                            click = ClickType.RIGHT;
+                        }
+                        if (packetplayinwindowclick.d() == 0 || packetplayinwindowclick.d() == 1) {
+                            action = InventoryAction.NOTHING; // Don't want to repeat ourselves
+                            if (packetplayinwindowclick.c() == -999) {
+                                if (!player.inventory.getCarried().isEmpty()) {
+                                    action = packetplayinwindowclick.d() == 0 ? InventoryAction.DROP_ALL_CURSOR : InventoryAction.DROP_ONE_CURSOR;
+                                }
+                            } else if (packetplayinwindowclick.c() < 0)  {
+                                action = InventoryAction.NOTHING;
+                            } else {
+                                Slot slot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                                if (slot != null) {
+                                    ItemStack clickedItem = slot.getItem();
+                                    ItemStack cursor = player.inventory.getCarried();
+                                    if (clickedItem.isEmpty()) {
+                                        if (!cursor.isEmpty()) {
+                                            action = packetplayinwindowclick.d() == 0 ? InventoryAction.PLACE_ALL : InventoryAction.PLACE_ONE;
+                                        }
+                                    } else if (slot.isAllowed(player)) {
+                                        if (cursor.isEmpty()) {
+                                            action = packetplayinwindowclick.d() == 0 ? InventoryAction.PICKUP_ALL : InventoryAction.PICKUP_HALF;
+                                        } else if (slot.isAllowed(cursor)) {
+                                            if (clickedItem.doMaterialsMatch(cursor) && ItemStack.equals(clickedItem, cursor)) {
+                                                int toPlace = packetplayinwindowclick.d() == 0 ? cursor.getCount() : 1;
+                                                toPlace = Math.min(toPlace, clickedItem.getMaxStackSize() - clickedItem.getCount());
+                                                toPlace = Math.min(toPlace, slot.inventory.getMaxStackSize() - clickedItem.getCount());
+                                                if (toPlace == 1) {
+                                                    action = InventoryAction.PLACE_ONE;
+                                                } else if (toPlace == cursor.getCount()) {
+                                                    action = InventoryAction.PLACE_ALL;
+                                                } else if (toPlace < 0) {
+                                                    action = toPlace != -1 ? InventoryAction.PICKUP_SOME : InventoryAction.PICKUP_ONE; // this happens with oversized stacks
+                                                } else if (toPlace != 0) {
+                                                    action = InventoryAction.PLACE_SOME;
+                                                }
+                                            } else if (cursor.getCount() <= slot.getMaxStackSize()) {
+                                                action = InventoryAction.SWAP_WITH_CURSOR;
+                                            }
+                                        } else if (cursor.getItem() == clickedItem.getItem() && ItemStack.equals(cursor, clickedItem)) {
+                                            if (clickedItem.getCount() >= 0) {
+                                                if (clickedItem.getCount() + cursor.getCount() <= cursor.getMaxStackSize()) {
+                                                    // As of 1.5, this is result slots only
+                                                    action = InventoryAction.PICKUP_ALL;
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                        break;
+                    // TODO check on updates
+                    case QUICK_MOVE:
+                        if (packetplayinwindowclick.d() == 0) {
+                            click = ClickType.SHIFT_LEFT;
+                        } else if (packetplayinwindowclick.d() == 1) {
+                            click = ClickType.SHIFT_RIGHT;
+                        }
+                        if (packetplayinwindowclick.d() == 0 || packetplayinwindowclick.d() == 1) {
+                            if (packetplayinwindowclick.c() < 0) {
+                                action = InventoryAction.NOTHING;
+                            } else {
+                                Slot slot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                                if (slot != null && slot.isAllowed(this.player) && slot.hasItem()) {
+                                    action = InventoryAction.MOVE_TO_OTHER_INVENTORY;
+                                } else {
+                                    action = InventoryAction.NOTHING;
+                                }
+                            }
+                        }
+                        break;
+                    case SWAP:
+                        if (packetplayinwindowclick.d() >= 0 && packetplayinwindowclick.d() < 9) {
+                            click = ClickType.NUMBER_KEY;
+                            Slot clickedSlot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                            if (clickedSlot.isAllowed(player)) {
+                                ItemStack hotbar = this.player.inventory.getItem(packetplayinwindowclick.d());
+                                boolean canCleanSwap = hotbar.isEmpty() || (clickedSlot.inventory == player.inventory && clickedSlot.isAllowed(hotbar)); // the slot will accept the hotbar item
+                                if (clickedSlot.hasItem()) {
+                                    if (canCleanSwap) {
+                                        action = InventoryAction.HOTBAR_SWAP;
+                                    } else {
+                                        action = InventoryAction.HOTBAR_MOVE_AND_READD;
+                                    }
+                                } else if (!clickedSlot.hasItem() && !hotbar.isEmpty() && clickedSlot.isAllowed(hotbar)) {
+                                    action = InventoryAction.HOTBAR_SWAP;
+                                } else {
+                                    action = InventoryAction.NOTHING;
+                                }
+                            } else {
+                                action = InventoryAction.NOTHING;
+                            }
+                        }
+                        break;
+                    case CLONE:
+                        if (packetplayinwindowclick.d() == 2) {
+                            click = ClickType.MIDDLE;
+                            if (packetplayinwindowclick.c() < 0) {
+                                action = InventoryAction.NOTHING;
+                            } else {
+                                Slot slot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                                if (slot != null && slot.hasItem() && player.abilities.canInstantlyBuild && player.inventory.getCarried().isEmpty()) {
+                                    action = InventoryAction.CLONE_STACK;
+                                } else {
+                                    action = InventoryAction.NOTHING;
+                                }
+                            }
+                        } else {
+                            click = ClickType.UNKNOWN;
+                            action = InventoryAction.UNKNOWN;
+                        }
+                        break;
+                    case THROW:
+                        if (packetplayinwindowclick.c() >= 0) {
+                            if (packetplayinwindowclick.d() == 0) {
+                                click = ClickType.DROP;
+                                Slot slot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                                if (slot != null && slot.hasItem() && slot.isAllowed(player) && !slot.getItem().isEmpty() && slot.getItem().getItem() != Item.getItemOf(Blocks.AIR)) {
+                                    action = InventoryAction.DROP_ONE_SLOT;
+                                } else {
+                                    action = InventoryAction.NOTHING;
+                                }
+                            } else if (packetplayinwindowclick.d() == 1) {
+                                click = ClickType.CONTROL_DROP;
+                                Slot slot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
+                                if (slot != null && slot.hasItem() && slot.isAllowed(player) && !slot.getItem().isEmpty() && slot.getItem().getItem() != Item.getItemOf(Blocks.AIR)) {
+                                    action = InventoryAction.DROP_ALL_SLOT;
+                                } else {
+                                    action = InventoryAction.NOTHING;
+                                }
+                            }
+                        } else {
+                            // Sane default (because this happens when they are holding nothing. Don't ask why.)
+                            click = ClickType.LEFT;
+                            if (packetplayinwindowclick.d() == 1) {
+                                click = ClickType.RIGHT;
+                            }
+                            action = InventoryAction.NOTHING;
+                        }
+                        break;
+                    case QUICK_CRAFT:
+                        itemstack = this.player.activeContainer.a(packetplayinwindowclick.c(), packetplayinwindowclick.d(), packetplayinwindowclick.g(), this.player);
+                        break;
+                    case PICKUP_ALL:
+                        click = ClickType.DOUBLE_CLICK;
+                        action = InventoryAction.NOTHING;
+                        if (packetplayinwindowclick.c() >= 0 && !this.player.inventory.getCarried().isEmpty()) {
+                            ItemStack cursor = this.player.inventory.getCarried();
+                            action = InventoryAction.NOTHING;
+                            // Quick check for if we have any of the item
+                            if (inventory.getTopInventory().contains(CraftMagicNumbers.getMaterial(cursor.getItem())) || inventory.getBottomInventory().contains(CraftMagicNumbers.getMaterial(cursor.getItem()))) {
+                                action = InventoryAction.COLLECT_TO_CURSOR;
+                            }
+                        }
+                        break;
+                    default:
+                        break;
+                }
+
+                if (packetplayinwindowclick.g() != InventoryClickType.QUICK_CRAFT) {
+                    if (click == ClickType.NUMBER_KEY) {
+                        event = new InventoryClickEvent(inventory, type, packetplayinwindowclick.c(), click, action, packetplayinwindowclick.d());
+                    } else {
+                        event = new InventoryClickEvent(inventory, type, packetplayinwindowclick.c(), click, action);
+                    }
+
+                    org.bukkit.inventory.Inventory top = inventory.getTopInventory();
+                    if (packetplayinwindowclick.c() == 0 && top instanceof CraftingInventory) {
+                        org.bukkit.inventory.Recipe recipe = ((CraftingInventory) top).getRecipe();
+                        if (recipe != null) {
+                            if (click == ClickType.NUMBER_KEY) {
+                                event = new CraftItemEvent(recipe, inventory, type, packetplayinwindowclick.c(), click, action, packetplayinwindowclick.d());
+                            } else {
+                                event = new CraftItemEvent(recipe, inventory, type, packetplayinwindowclick.c(), click, action);
+                            }
+                        }
+                    }
 
+                    event.setCancelled(cancelled);
+                    Container oldContainer = this.player.activeContainer; // SPIGOT-1224
+                    server.getPluginManager().callEvent(event);
+                    if (this.player.activeContainer != oldContainer) {
+                        return;
+                    }
+
+                    switch (event.getResult()) {
+                        case ALLOW:
+                        case DEFAULT:
+                            itemstack = this.player.activeContainer.a(packetplayinwindowclick.c(), packetplayinwindowclick.d(), packetplayinwindowclick.g(), this.player);
+                            break;
+                        case DENY:
+                            /* Needs enum constructor in InventoryAction
+                            if (action.modifiesOtherSlots()) {
+
+                            } else {
+                                if (action.modifiesCursor()) {
+                                    this.player.playerConnection.sendPacket(new Packet103SetSlot(-1, -1, this.player.inventory.getCarried()));
+                                }
+                                if (action.modifiesClicked()) {
+                                    this.player.playerConnection.sendPacket(new Packet103SetSlot(this.player.activeContainer.windowId, packet102windowclick.slot, this.player.activeContainer.getSlot(packet102windowclick.slot).getItem()));
+                                }
+                            }*/
+                            switch (action) {
+                                // Modified other slots
+                                case PICKUP_ALL:
+                                case MOVE_TO_OTHER_INVENTORY:
+                                case HOTBAR_MOVE_AND_READD:
+                                case HOTBAR_SWAP:
+                                case COLLECT_TO_CURSOR:
+                                case UNKNOWN:
+                                    this.player.updateInventory(this.player.activeContainer);
+                                    break;
+                                // Modified cursor and clicked
+                                case PICKUP_SOME:
+                                case PICKUP_HALF:
+                                case PICKUP_ONE:
+                                case PLACE_ALL:
+                                case PLACE_SOME:
+                                case PLACE_ONE:
+                                case SWAP_WITH_CURSOR:
+                                    this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(-1, -1, this.player.inventory.getCarried()));
+                                    this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(this.player.activeContainer.windowId, packetplayinwindowclick.c(), this.player.activeContainer.getSlot(packetplayinwindowclick.c()).getItem()));
+                                    break;
+                                // Modified clicked only
+                                case DROP_ALL_SLOT:
+                                case DROP_ONE_SLOT:
+                                    this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(this.player.activeContainer.windowId, packetplayinwindowclick.c(), this.player.activeContainer.getSlot(packetplayinwindowclick.c()).getItem()));
+                                    break;
+                                // Modified cursor only
+                                case DROP_ALL_CURSOR:
+                                case DROP_ONE_CURSOR:
+                                case CLONE_STACK:
+                                    this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(-1, -1, this.player.inventory.getCarried()));
+                                    break;
+                                // Nothing
+                                case NOTHING:
+                                    break;
+                            }
+                            return;
+                    }
+
+                    if (event instanceof CraftItemEvent) {
+                        // Need to update the inventory on crafting to
+                        // correctly support custom recipes
+                        player.updateInventory(player.activeContainer);
+                    }
+                }
+                // CraftBukkit end
                 if (ItemStack.matches(packetplayinwindowclick.f(), itemstack)) {
                     this.player.playerConnection.sendPacket(new PacketPlayOutTransaction(packetplayinwindowclick.b(), packetplayinwindowclick.e(), true));
                     this.player.e = true;
@@ -1138,6 +2177,7 @@
     @Override
     public void a(PacketPlayInEnchantItem packetplayinenchantitem) {
         PlayerConnectionUtils.ensureMainThread(packetplayinenchantitem, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         this.player.resetIdleTimer();
         if (this.player.activeContainer.windowId == packetplayinenchantitem.b() && this.player.activeContainer.c(this.player) && !this.player.isSpectator()) {
             this.player.activeContainer.a((EntityHuman) this.player, packetplayinenchantitem.c());
@@ -1170,6 +2210,43 @@
 
             boolean flag1 = packetplayinsetcreativeslot.b() >= 1 && packetplayinsetcreativeslot.b() <= 45;
             boolean flag2 = itemstack.isEmpty() || itemstack.getDamage() >= 0 && itemstack.getCount() <= 64 && !itemstack.isEmpty();
+            if (flag || (flag1 && !ItemStack.matches(this.player.defaultContainer.getSlot(packetplayinsetcreativeslot.b()).getItem(), packetplayinsetcreativeslot.getItemStack()))) { // Insist on valid slot
+                // CraftBukkit start - Call click event
+                InventoryView inventory = this.player.defaultContainer.getBukkitView();
+                org.bukkit.inventory.ItemStack item = CraftItemStack.asBukkitCopy(packetplayinsetcreativeslot.getItemStack());
+
+                SlotType type = SlotType.QUICKBAR;
+                if (flag) {
+                    type = SlotType.OUTSIDE;
+                } else if (packetplayinsetcreativeslot.b() < 36) {
+                    if (packetplayinsetcreativeslot.b() >= 5 && packetplayinsetcreativeslot.b() < 9) {
+                        type = SlotType.ARMOR;
+                    } else {
+                        type = SlotType.CONTAINER;
+                    }
+                }
+                InventoryCreativeEvent event = new InventoryCreativeEvent(inventory, type, flag ? -999 : packetplayinsetcreativeslot.b(), item);
+                server.getPluginManager().callEvent(event);
+
+                itemstack = CraftItemStack.asNMSCopy(event.getCursor());
+
+                switch (event.getResult()) {
+                case ALLOW:
+                    // Plugin cleared the id / stacksize checks
+                    flag2 = true;
+                    break;
+                case DEFAULT:
+                    break;
+                case DENY:
+                    // Reset the slot
+                    if (packetplayinsetcreativeslot.b() >= 0) {
+                        this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(this.player.defaultContainer.windowId, packetplayinsetcreativeslot.b(), this.player.defaultContainer.getSlot(packetplayinsetcreativeslot.b()).getItem()));
+                        this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(-1, -1, ItemStack.a));
+                    }
+                    return;
+                }
+            }
+            // CraftBukkit end
 
             if (flag1 && flag2) {
                 if (itemstack.isEmpty()) {
@@ -1195,6 +2272,7 @@
     @Override
     public void a(PacketPlayInTransaction packetplayintransaction) {
         PlayerConnectionUtils.ensureMainThread(packetplayintransaction, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         int i = this.player.activeContainer.windowId;
 
         if (i == packetplayintransaction.b() && this.k.getOrDefault(i, (short) (packetplayintransaction.c() + 1)) == packetplayintransaction.c() && !this.player.activeContainer.c(this.player) && !this.player.isSpectator()) {
@@ -1206,6 +2284,7 @@
     @Override
     public void a(PacketPlayInUpdateSign packetplayinupdatesign) {
         PlayerConnectionUtils.ensureMainThread(packetplayinupdatesign, this, this.player.getWorldServer());
+        if (this.player.isFrozen()) return; // CraftBukkit
         this.player.resetIdleTimer();
         WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
         BlockPosition blockposition = packetplayinupdatesign.b();
@@ -1222,14 +2301,30 @@
 
             if (!tileentitysign.d() || tileentitysign.f() != this.player) {
                 this.minecraftServer.warning("Player " + this.player.getDisplayName().getString() + " just tried to change non-editable sign");
+                this.sendPacket(tileentity.getUpdatePacket()); // CraftBukkit
                 return;
             }
 
             String[] astring = packetplayinupdatesign.c();
 
+            // CraftBukkit start
+            Player player = this.server.getPlayer(this.player);
+            int x = packetplayinupdatesign.b().getX();
+            int y = packetplayinupdatesign.b().getY();
+            int z = packetplayinupdatesign.b().getZ();
+            String[] lines = new String[4];
+
             for (int i = 0; i < astring.length; ++i) {
-                tileentitysign.a(i, new ChatComponentText(EnumChatFormat.b(astring[i])));
+                lines[i] = EnumChatFormat.b(new ChatComponentText(EnumChatFormat.b(astring[i])).getString());
             }
+            SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
+            this.server.getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                System.arraycopy(org.bukkit.craftbukkit.block.CraftSign.sanitizeLines(event.getLines()), 0, tileentitysign.lines, 0, 4);
+                tileentitysign.isEditable = false;
+             }
+            // CraftBukkit end
 
             tileentitysign.update();
             worldserver.notify(blockposition, iblockdata, iblockdata, 3);
@@ -1239,6 +2334,7 @@
 
     @Override
     public void a(PacketPlayInKeepAlive packetplayinkeepalive) {
+        PlayerConnectionUtils.ensureMainThread(packetplayinkeepalive, this, this.player.getWorldServer()); // CraftBukkit
         if (this.awaitingKeepAlive && packetplayinkeepalive.b() == this.h) {
             int i = (int) (SystemUtils.getMonotonicMillis() - this.lastKeepAlive);
 
@@ -1253,7 +2349,17 @@
     @Override
     public void a(PacketPlayInAbilities packetplayinabilities) {
         PlayerConnectionUtils.ensureMainThread(packetplayinabilities, this, this.player.getWorldServer());
-        this.player.abilities.isFlying = packetplayinabilities.isFlying() && this.player.abilities.canFly;
+        // CraftBukkit start
+        if (this.player.abilities.canFly && this.player.abilities.isFlying != packetplayinabilities.isFlying()) {
+            PlayerToggleFlightEvent event = new PlayerToggleFlightEvent(this.server.getPlayer(this.player), packetplayinabilities.isFlying());
+            this.server.getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
+                this.player.abilities.isFlying = packetplayinabilities.isFlying(); // Actually set the player's flying status
+            } else {
+                this.player.updateAbilities(); // Tell the player their ability was reverted
+            }
+        }
+        // CraftBukkit end
     }
 
     @Override
@@ -1262,8 +2368,50 @@
         this.player.a(packetplayinsettings);
     }
 
-    @Override
-    public void a(PacketPlayInCustomPayload packetplayincustompayload) {}
+    // CraftBukkit start
+    private static final MinecraftKey CUSTOM_REGISTER = new MinecraftKey("register");
+    private static final MinecraftKey CUSTOM_UNREGISTER = new MinecraftKey("unregister");
+
+    @Override
+    public void a(PacketPlayInCustomPayload packetplayincustompayload) {
+        PlayerConnectionUtils.ensureMainThread(packetplayincustompayload, this, this.player.getWorldServer());
+        if (packetplayincustompayload.tag.equals(CUSTOM_REGISTER)) {
+            try {
+                String channels = packetplayincustompayload.data.toString(com.google.common.base.Charsets.UTF_8);
+                for (String channel : channels.split("\0")) {
+                    getPlayer().addChannel(channel);
+                }
+            } catch (Exception ex) {
+                PlayerConnection.LOGGER.error("Couldn\'t register custom payload", ex);
+                this.disconnect("Invalid payload REGISTER!");
+            }
+        } else if (packetplayincustompayload.tag.equals(CUSTOM_UNREGISTER)) {
+            try {
+                String channels = packetplayincustompayload.data.toString(com.google.common.base.Charsets.UTF_8);
+                for (String channel : channels.split("\0")) {
+                    getPlayer().removeChannel(channel);
+                }
+            } catch (Exception ex) {
+                PlayerConnection.LOGGER.error("Couldn\'t unregister custom payload", ex);
+                this.disconnect("Invalid payload UNREGISTER!");
+            }
+        } else {
+            try {
+                byte[] data = new byte[packetplayincustompayload.data.readableBytes()];
+                packetplayincustompayload.data.readBytes(data);
+                server.getMessenger().dispatchIncomingMessage(player.getBukkitEntity(), packetplayincustompayload.tag.toString(), data);
+            } catch (Exception ex) {
+                PlayerConnection.LOGGER.error("Couldn\'t dispatch custom payload", ex);
+                this.disconnect("Invalid custom payload!");
+            }
+        }
+
+    }
+
+    public final boolean isDisconnected() {
+        return !this.player.joining && !this.networkManager.isConnected();
+    }
+    // CraftBukkit end
 
     @Override
     public void a(PacketPlayInDifficultyChange packetplayindifficultychange) {