PaperMC/paper-server/nms-patches/net/minecraft/server/players/PlayerList.patch

--- a/net/minecraft/server/players/PlayerList.java
+++ b/net/minecraft/server/players/PlayerList.java
@@ -93,6 +93,25 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import com.google.common.base.Predicate;
+import java.util.stream.Collectors;
+import net.minecraft.network.protocol.game.PacketPlayOutChat;
+import net.minecraft.network.protocol.game.PacketPlayOutEntityMetadata;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.network.LoginListener;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.player.PlayerRespawnEvent;
+// CraftBukkit end
+
 public abstract class PlayerList {
 
     public static final File USERBANLIST_FILE = new File("banned-players.json");
@@ -103,14 +122,16 @@
     private static final int SEND_PLAYER_INFO_INTERVAL = 600;
     private static final SimpleDateFormat BAN_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd 'at' HH:mm:ss z");
     private final MinecraftServer server;
-    public final List<EntityPlayer> players = Lists.newArrayList();
+    public final List<EntityPlayer> players = new java.util.concurrent.CopyOnWriteArrayList(); // CraftBukkit - ArrayList -> CopyOnWriteArrayList: Iterator safety
     private final Map<UUID, EntityPlayer> playersByUUID = Maps.newHashMap();
     private final GameProfileBanList bans;
     private final IpBanList ipBans;
     private final OpList ops;
     private final WhiteList whitelist;
-    private final Map<UUID, ServerStatisticManager> stats;
-    private final Map<UUID, AdvancementDataPlayer> advancements;
+    // CraftBukkit start
+    // private final Map<UUID, ServerStatisticManager> o;
+    // private final Map<UUID, AdvancementDataPlayer> p;
+    // CraftBukkit end
     public final WorldNBTStorage playerIo;
     private boolean doWhiteList;
     private final IRegistryCustom.Dimension registryHolder;
@@ -120,13 +141,23 @@
     private static final boolean ALLOW_LOGOUTIVATOR = false;
     private int sendAllPlayerInfoIn;
 
+    // CraftBukkit start
+    private CraftServer cserver;
+
     public PlayerList(MinecraftServer minecraftserver, IRegistryCustom.Dimension iregistrycustom_dimension, WorldNBTStorage worldnbtstorage, int i) {
+        this.cserver = minecraftserver.server = new CraftServer((DedicatedServer) minecraftserver, this);
+        minecraftserver.console = org.bukkit.craftbukkit.command.ColouredConsoleSender.getInstance();
+        minecraftserver.reader.addCompleter(new org.bukkit.craftbukkit.command.ConsoleCommandCompleter(minecraftserver.server));
+        // CraftBukkit end
+
         this.bans = new GameProfileBanList(PlayerList.USERBANLIST_FILE);
         this.ipBans = new IpBanList(PlayerList.IPBANLIST_FILE);
         this.ops = new OpList(PlayerList.OPLIST_FILE);
         this.whitelist = new WhiteList(PlayerList.WHITELIST_FILE);
-        this.stats = Maps.newHashMap();
-        this.advancements = Maps.newHashMap();
+        // CraftBukkit start
+        // this.o = Maps.newHashMap();
+        // this.p = Maps.newHashMap();
+        // CraftBukkit end
         this.server = minecraftserver;
         this.registryHolder = iregistrycustom_dimension;
         this.maxPlayers = i;
@@ -142,6 +173,12 @@
         usercache.a(gameprofile);
         NBTTagCompound nbttagcompound = this.a(entityplayer);
         ResourceKey resourcekey;
+        // CraftBukkit start - Better rename detection
+        if (nbttagcompound != null && nbttagcompound.hasKey("bukkit")) {
+            NBTTagCompound bukkit = nbttagcompound.getCompound("bukkit");
+            s = bukkit.hasKeyOfType("lastKnownName", 8) ? bukkit.getString("lastKnownName") : s;
+        }
+        // CraftBukkit end
 
         if (nbttagcompound != null) {
             DataResult dataresult = DimensionManager.a(new Dynamic(DynamicOpsNBT.INSTANCE, nbttagcompound.get("Dimension")));
@@ -171,7 +208,8 @@
             s1 = networkmanager.getSocketAddress().toString();
         }
 
-        PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ({}, {}, {})", entityplayer.getDisplayName().getString(), s1, entityplayer.getId(), entityplayer.locX(), entityplayer.locY(), entityplayer.locZ());
+        // CraftBukkit - Moved message to after join
+        // PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ({}, {}, {})", entityplayer.getDisplayName().getString(), s1, entityplayer.getId(), entityplayer.locX(), entityplayer.locY(), entityplayer.locZ());
         WorldData worlddata = worldserver1.getWorldData();
 
         entityplayer.c(nbttagcompound);
@@ -181,6 +219,7 @@
         boolean flag1 = gamerules.getBoolean(GameRules.RULE_REDUCEDDEBUGINFO);
 
         playerconnection.sendPacket(new PacketPlayOutLogin(entityplayer.getId(), entityplayer.gameMode.getGameMode(), entityplayer.gameMode.c(), BiomeManager.a(worldserver1.getSeed()), worlddata.isHardcore(), this.server.G(), this.registryHolder, worldserver1.getDimensionManager(), worldserver1.getDimensionKey(), this.getMaxPlayers(), this.viewDistance, flag1, !flag, worldserver1.isDebugWorld(), worldserver1.isFlatWorld()));
+        entityplayer.getBukkitEntity().sendSupportedChannels(); // CraftBukkit
         playerconnection.sendPacket(new PacketPlayOutCustomPayload(PacketPlayOutCustomPayload.BRAND, (new PacketDataSerializer(Unpooled.buffer())).a(this.getServer().getServerModName())));
         playerconnection.sendPacket(new PacketPlayOutServerDifficulty(worlddata.getDifficulty(), worlddata.isDifficultyLocked()));
         playerconnection.sendPacket(new PacketPlayOutAbilities(entityplayer.getAbilities()));
@@ -199,19 +238,61 @@
         } else {
             chatmessage = new ChatMessage("multiplayer.player.joined.renamed", new Object[]{entityplayer.getScoreboardDisplayName(), s});
         }
+        // CraftBukkit start
+        chatmessage.a(EnumChatFormat.YELLOW);
+        String joinMessage = CraftChatMessage.fromComponent(chatmessage);
 
-        this.sendMessage(chatmessage.a(EnumChatFormat.YELLOW), ChatMessageType.SYSTEM, SystemUtils.NIL_UUID);
         playerconnection.b(entityplayer.locX(), entityplayer.locY(), entityplayer.locZ(), entityplayer.getYRot(), entityplayer.getXRot());
         this.players.add(entityplayer);
         this.playersByUUID.put(entityplayer.getUniqueID(), entityplayer);
-        this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[]{entityplayer}));
+        // this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[]{entityplayer})); // CraftBukkit - replaced with loop below
+
+        // CraftBukkit start
+        PlayerJoinEvent playerJoinEvent = new PlayerJoinEvent(cserver.getPlayer(entityplayer), joinMessage);
+        cserver.getPluginManager().callEvent(playerJoinEvent);
+
+        if (!entityplayer.connection.connection.isConnected()) {
+            return;
+        }
+
+        joinMessage = playerJoinEvent.getJoinMessage();
+
+        if (joinMessage != null && joinMessage.length() > 0) {
+            for (IChatBaseComponent line : org.bukkit.craftbukkit.util.CraftChatMessage.fromString(joinMessage)) {
+                server.getPlayerList().sendAll(new PacketPlayOutChat(line, ChatMessageType.SYSTEM, SystemUtils.NIL_UUID));
+            }
+        }
+        // CraftBukkit end
+
+        // CraftBukkit start - sendAll above replaced with this loop
+        PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, entityplayer);
 
         for (int i = 0; i < this.players.size(); ++i) {
-            entityplayer.connection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[]{(EntityPlayer) this.players.get(i)}));
+            EntityPlayer entityplayer1 = (EntityPlayer) this.players.get(i);
+
+            if (entityplayer1.getBukkitEntity().canSee(entityplayer.getBukkitEntity())) {
+                entityplayer1.connection.sendPacket(packet);
+            }
+
+            if (!entityplayer.getBukkitEntity().canSee(entityplayer1.getBukkitEntity())) {
+                continue;
+            }
+
+            entityplayer.connection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[] { entityplayer1}));
+        }
+        entityplayer.sentListPacket = true;
+        // CraftBukkit end
+
+        entityplayer.connection.sendPacket(new PacketPlayOutEntityMetadata(entityplayer.getId(), entityplayer.getDataWatcher(), true)); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn
+
+        // CraftBukkit start - Only add if the player wasn't moved in the event
+        if (entityplayer.level == worldserver1 && !worldserver1.getPlayers().contains(entityplayer)) {
+            worldserver1.addPlayerJoin(entityplayer);
+            this.server.getBossBattleCustomData().a(entityplayer);
         }
 
-        worldserver1.addPlayerJoin(entityplayer);
-        this.server.getBossBattleCustomData().a(entityplayer);
+        worldserver1 = entityplayer.getWorldServer();  // CraftBukkit - Update in case join event changed it
+        // CraftBukkit end
         this.a(entityplayer, worldserver1);
         if (!this.server.getResourcePack().isEmpty()) {
             entityplayer.setResourcePack(this.server.getResourcePack(), this.server.getResourcePackHash(), this.server.aY(), this.server.bb());
@@ -227,8 +308,11 @@
 
         if (nbttagcompound != null && nbttagcompound.hasKeyOfType("RootVehicle", 10)) {
             NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("RootVehicle");
-            Entity entity = EntityTypes.a(nbttagcompound1.getCompound("Entity"), worldserver1, (entity1) -> {
-                return !worldserver1.addEntitySerialized(entity1) ? null : entity1;
+            // CraftBukkit start
+            WorldServer finalWorldServer = worldserver1;
+            Entity entity = EntityTypes.a(nbttagcompound1.getCompound("Entity"), finalWorldServer, (entity1) -> {
+                return !finalWorldServer.addEntitySerialized(entity1) ? null : entity1;
+                // CraftBukkit end
             });
 
             if (entity != null) {
@@ -271,6 +355,8 @@
         }
 
         entityplayer.syncInventory();
+        // CraftBukkit - Moved from above, added world
+        PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ([{}]{}, {}, {})", entityplayer.getDisplayName().getString(), s1, entityplayer.getId(), worldserver1.serverLevelData.getName(), entityplayer.locX(), entityplayer.locY(), entityplayer.locZ());
     }
 
     public void sendScoreboard(ScoreboardServer scoreboardserver, EntityPlayer entityplayer) {
@@ -303,30 +389,31 @@
     }
 
     public void setPlayerFileData(WorldServer worldserver) {
+        if (playerIo != null) return; // CraftBukkit
         worldserver.getWorldBorder().a(new IWorldBorderListener() {
             @Override
             public void a(WorldBorder worldborder, double d0) {
-                PlayerList.this.sendAll(new ClientboundSetBorderSizePacket(worldborder));
+                PlayerList.this.sendAll(new ClientboundSetBorderSizePacket(worldborder), worldborder.world); // CraftBukkit
             }
 
             @Override
             public void a(WorldBorder worldborder, double d0, double d1, long i) {
-                PlayerList.this.sendAll(new ClientboundSetBorderLerpSizePacket(worldborder));
+                PlayerList.this.sendAll(new ClientboundSetBorderLerpSizePacket(worldborder), worldborder.world); // CraftBukkit
             }
 
             @Override
             public void a(WorldBorder worldborder, double d0, double d1) {
-                PlayerList.this.sendAll(new ClientboundSetBorderCenterPacket(worldborder));
+                PlayerList.this.sendAll(new ClientboundSetBorderCenterPacket(worldborder), worldborder.world); // CraftBukkit
             }
 
             @Override
             public void a(WorldBorder worldborder, int i) {
-                PlayerList.this.sendAll(new ClientboundSetBorderWarningDelayPacket(worldborder));
+                PlayerList.this.sendAll(new ClientboundSetBorderWarningDelayPacket(worldborder), worldborder.world); // CraftBukkit
             }
 
             @Override
             public void b(WorldBorder worldborder, int i) {
-                PlayerList.this.sendAll(new ClientboundSetBorderWarningDistancePacket(worldborder));
+                PlayerList.this.sendAll(new ClientboundSetBorderWarningDistancePacket(worldborder), worldborder.world); // CraftBukkit
             }
 
             @Override
@@ -354,14 +441,15 @@
     }
 
     protected void savePlayerFile(EntityPlayer entityplayer) {
+        if (!entityplayer.getBukkitEntity().isPersistent()) return; // CraftBukkit
         this.playerIo.save(entityplayer);
-        ServerStatisticManager serverstatisticmanager = (ServerStatisticManager) this.stats.get(entityplayer.getUniqueID());
+        ServerStatisticManager serverstatisticmanager = (ServerStatisticManager) entityplayer.getStatisticManager(); // CraftBukkit
 
         if (serverstatisticmanager != null) {
             serverstatisticmanager.save();
         }
 
-        AdvancementDataPlayer advancementdataplayer = (AdvancementDataPlayer) this.advancements.get(entityplayer.getUniqueID());
+        AdvancementDataPlayer advancementdataplayer = (AdvancementDataPlayer) entityplayer.getAdvancementData(); // CraftBukkit
 
         if (advancementdataplayer != null) {
             advancementdataplayer.b();
@@ -369,10 +457,24 @@
 
     }
 
-    public void disconnect(EntityPlayer entityplayer) {
+    public String disconnect(EntityPlayer entityplayer) { // CraftBukkit - return string
         WorldServer worldserver = entityplayer.getWorldServer();
 
         entityplayer.a(StatisticList.LEAVE_GAME);
+
+        // CraftBukkit start - Quitting must be before we do final save of data, in case plugins need to modify it
+        // See SPIGOT-5799, SPIGOT-6145
+        if (entityplayer.containerMenu != entityplayer.inventoryMenu) {
+            entityplayer.closeInventory();
+        }
+
+        PlayerQuitEvent playerQuitEvent = new PlayerQuitEvent(cserver.getPlayer(entityplayer), "\u00A7e" + entityplayer.getName() + " left the game");
+        cserver.getPluginManager().callEvent(playerQuitEvent);
+        entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage());
+
+        entityplayer.playerTick(); // SPIGOT-924
+        // CraftBukkit end
+
         this.savePlayerFile(entityplayer);
         if (entityplayer.isPassenger()) {
             Entity entity = entityplayer.getRootVehicle();
@@ -396,18 +498,66 @@
 
         if (entityplayer1 == entityplayer) {
             this.playersByUUID.remove(uuid);
-            this.stats.remove(uuid);
-            this.advancements.remove(uuid);
+            // CraftBukkit start
+            // this.o.remove(uuid);
+            // this.p.remove(uuid);
+            // CraftBukkit end
+        }
+
+        // CraftBukkit start
+        // this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, new EntityPlayer[]{entityplayer}));
+        PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, entityplayer);
+        for (int i = 0; i < players.size(); i++) {
+            EntityPlayer entityplayer2 = (EntityPlayer) this.players.get(i);
+
+            if (entityplayer2.getBukkitEntity().canSee(entityplayer.getBukkitEntity())) {
+                entityplayer2.connection.sendPacket(packet);
+            } else {
+                entityplayer2.getBukkitEntity().removeDisconnectingPlayer(entityplayer.getBukkitEntity());
+            }
         }
+        // This removes the scoreboard (and player reference) for the specific player in the manager
+        cserver.getScoreboardManager().removePlayer(entityplayer.getBukkitEntity());
+        // CraftBukkit end
 
-        this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, new EntityPlayer[]{entityplayer}));
+        return playerQuitEvent.getQuitMessage(); // CraftBukkit
     }
 
-    @Nullable
-    public IChatBaseComponent attemptLogin(SocketAddress socketaddress, GameProfile gameprofile) {
+    // CraftBukkit start - Whole method, SocketAddress to LoginListener, added hostname to signature, return EntityPlayer
+    public EntityPlayer attemptLogin(LoginListener loginlistener, GameProfile gameprofile, String hostname) {
         ChatMessage chatmessage;
 
-        if (this.bans.isBanned(gameprofile)) {
+        // Moved from processLogin
+        UUID uuid = EntityHuman.a(gameprofile);
+        List<EntityPlayer> list = Lists.newArrayList();
+
+        EntityPlayer entityplayer;
+
+        for (int i = 0; i < this.players.size(); ++i) {
+            entityplayer = (EntityPlayer) this.players.get(i);
+            if (entityplayer.getUniqueID().equals(uuid)) {
+                list.add(entityplayer);
+            }
+        }
+
+        Iterator iterator = list.iterator();
+
+        while (iterator.hasNext()) {
+            entityplayer = (EntityPlayer) iterator.next();
+            savePlayerFile(entityplayer); // CraftBukkit - Force the player's inventory to be saved
+            entityplayer.connection.disconnect(new ChatMessage("multiplayer.disconnect.duplicate_login", new Object[0]));
+        }
+
+        // Instead of kicking then returning, we need to store the kick reason
+        // in the event, check with plugins to see if it's ok, and THEN kick
+        // depending on the outcome.
+        SocketAddress socketaddress = loginlistener.connection.getSocketAddress();
+
+        EntityPlayer entity = new EntityPlayer(this.server, this.server.getWorldServer(World.OVERWORLD), gameprofile);
+        Player player = entity.getBukkitEntity();
+        PlayerLoginEvent event = new PlayerLoginEvent(player, hostname, ((java.net.InetSocketAddress) socketaddress).getAddress());
+
+        if (getProfileBans().isBanned(gameprofile) && !getProfileBans().get(gameprofile).hasExpired()) {
             GameProfileBanEntry gameprofilebanentry = (GameProfileBanEntry) this.bans.get(gameprofile);
 
             chatmessage = new ChatMessage("multiplayer.disconnect.banned.reason", new Object[]{gameprofilebanentry.getReason()});
@@ -415,10 +565,12 @@
                 chatmessage.addSibling(new ChatMessage("multiplayer.disconnect.banned.expiration", new Object[]{PlayerList.BAN_DATE_FORMAT.format(gameprofilebanentry.getExpires())}));
             }
 
-            return chatmessage;
+            // return chatmessage;
+            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, CraftChatMessage.fromComponent(chatmessage));
         } else if (!this.isWhitelisted(gameprofile)) {
-            return new ChatMessage("multiplayer.disconnect.not_whitelisted");
-        } else if (this.ipBans.isBanned(socketaddress)) {
+            chatmessage = new ChatMessage("multiplayer.disconnect.not_whitelisted");
+            event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, CraftChatMessage.fromComponent(chatmessage));
+        } else if (getIPBans().isBanned(socketaddress) && !getIPBans().get(socketaddress).hasExpired()) {
             IpBanEntry ipbanentry = this.ipBans.get(socketaddress);
 
             chatmessage = new ChatMessage("multiplayer.disconnect.banned_ip.reason", new Object[]{ipbanentry.getReason()});
@@ -426,13 +578,25 @@
                 chatmessage.addSibling(new ChatMessage("multiplayer.disconnect.banned_ip.expiration", new Object[]{PlayerList.BAN_DATE_FORMAT.format(ipbanentry.getExpires())}));
             }
 
-            return chatmessage;
+            // return chatmessage;
+            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, CraftChatMessage.fromComponent(chatmessage));
         } else {
-            return this.players.size() >= this.maxPlayers && !this.d(gameprofile) ? new ChatMessage("multiplayer.disconnect.server_full") : null;
+            // return this.players.size() >= this.maxPlayers && !this.d(gameprofile) ? new ChatMessage("multiplayer.disconnect.server_full") : null;
+            if (this.players.size() >= this.maxPlayers && !this.d(gameprofile)) {
+                event.disallow(PlayerLoginEvent.Result.KICK_FULL, "The server is full");
+            }
         }
+
+        cserver.getPluginManager().callEvent(event);
+        if (event.getResult() != PlayerLoginEvent.Result.ALLOWED) {
+            loginlistener.disconnect(event.getKickMessage());
+            return null;
+        }
+        return entity;
     }
 
-    public EntityPlayer processLogin(GameProfile gameprofile) {
+    public EntityPlayer processLogin(GameProfile gameprofile, EntityPlayer player) { // CraftBukkit - added EntityPlayer
+        /* CraftBukkit startMoved up
         UUID uuid = EntityHuman.a(gameprofile);
         List<EntityPlayer> list = Lists.newArrayList();
 
@@ -459,14 +623,24 @@
         }
 
         return new EntityPlayer(this.server, this.server.F(), gameprofile);
+        */
+        return player;
+        // CraftBukkit end
     }
 
+    // CraftBukkit start
     public EntityPlayer moveToWorld(EntityPlayer entityplayer, boolean flag) {
+        return this.moveToWorld(entityplayer, this.server.getWorldServer(entityplayer.getSpawnDimension()), flag, null, true);
+    }
+
+    public EntityPlayer moveToWorld(EntityPlayer entityplayer, WorldServer worldserver, boolean flag, Location location, boolean avoidSuffocation) {
+        entityplayer.stopRiding(); // CraftBukkit
         this.players.remove(entityplayer);
         entityplayer.getWorldServer().a(entityplayer, Entity.RemovalReason.DISCARDED);
         BlockPosition blockposition = entityplayer.getSpawn();
         float f = entityplayer.getSpawnAngle();
         boolean flag1 = entityplayer.isSpawnForced();
+        /* CraftBukkit start
         WorldServer worldserver = this.server.getWorldServer(entityplayer.getSpawnDimension());
         Optional optional;
 
@@ -478,6 +652,11 @@
 
         WorldServer worldserver1 = worldserver != null && optional.isPresent() ? worldserver : this.server.F();
         EntityPlayer entityplayer1 = new EntityPlayer(this.server, worldserver1, entityplayer.getProfile());
+        // */
+        EntityPlayer entityplayer1 = entityplayer;
+        org.bukkit.World fromWorld = entityplayer.getBukkitEntity().getWorld();
+        entityplayer.wonGame = false;
+        // CraftBukkit end
 
         entityplayer1.connection = entityplayer.connection;
         entityplayer1.copyFrom(entityplayer, flag);
@@ -493,49 +672,110 @@
 
         boolean flag2 = false;
 
-        if (optional.isPresent()) {
-            IBlockData iblockdata = worldserver1.getType(blockposition);
-            boolean flag3 = iblockdata.a(Blocks.RESPAWN_ANCHOR);
-            Vec3D vec3d = (Vec3D) optional.get();
-            float f1;
+        // CraftBukkit start - fire PlayerRespawnEvent
+        if (location == null) {
+            boolean isBedSpawn = false;
+            WorldServer worldserver1 = this.server.getWorldServer(entityplayer.getSpawnDimension());
+            if (worldserver1 != null) {
+                Optional optional;
 
-            if (!iblockdata.a((Tag) TagsBlock.BEDS) && !flag3) {
-                f1 = f;
-            } else {
-                Vec3D vec3d1 = Vec3D.c((BaseBlockPosition) blockposition).d(vec3d).d();
+                if (blockposition != null) {
+                    optional = EntityHuman.getBed(worldserver1, blockposition, f, flag1, flag);
+                } else {
+                    optional = Optional.empty();
+                }
+
+                if (optional.isPresent()) {
+                    IBlockData iblockdata = worldserver1.getType(blockposition);
+                    boolean flag3 = iblockdata.a(Blocks.RESPAWN_ANCHOR);
+                    Vec3D vec3d = (Vec3D) optional.get();
+                    float f1;
+
+                    if (!iblockdata.a((Tag) TagsBlock.BEDS) && !flag3) {
+                        f1 = f;
+                    } else {
+                        Vec3D vec3d1 = Vec3D.c((BaseBlockPosition) blockposition).d(vec3d).d();
+
+                        f1 = (float) MathHelper.f(MathHelper.d(vec3d1.z, vec3d1.x) * 57.2957763671875D - 90.0D);
+                    }
+
+                    entityplayer1.setRespawnPosition(worldserver1.getDimensionKey(), blockposition, f, flag1, false);
+                    flag2 = !flag && flag3;
+                    isBedSpawn = true;
+                    location = new Location(worldserver1.getWorld(), vec3d.x, vec3d.y, vec3d.z, f1, 0.0F);
+                } else if (blockposition != null) {
+                    entityplayer1.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.NO_RESPAWN_BLOCK_AVAILABLE, 0.0F));
+                }
+            }
 
-                f1 = (float) MathHelper.f(MathHelper.d(vec3d1.z, vec3d1.x) * 57.2957763671875D - 90.0D);
+            if (location == null) {
+                worldserver1 = this.server.getWorldServer(World.OVERWORLD);
+                blockposition = entityplayer1.getSpawnPoint(worldserver1);
+                location = new Location(worldserver1.getWorld(), (double) ((float) blockposition.getX() + 0.5F), (double) ((float) blockposition.getY() + 0.1F), (double) ((float) blockposition.getZ() + 0.5F));
             }
 
-            entityplayer1.setPositionRotation(vec3d.x, vec3d.y, vec3d.z, f1, 0.0F);
-            entityplayer1.setRespawnPosition(worldserver1.getDimensionKey(), blockposition, f, flag1, false);
-            flag2 = !flag && flag3;
-        } else if (blockposition != null) {
-            entityplayer1.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.NO_RESPAWN_BLOCK_AVAILABLE, 0.0F));
+            Player respawnPlayer = cserver.getPlayer(entityplayer1);
+            PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(respawnPlayer, location, isBedSpawn && !flag2, flag2);
+            cserver.getPluginManager().callEvent(respawnEvent);
+
+            location = respawnEvent.getRespawnLocation();
+            if (!flag) entityplayer.reset(); // SPIGOT-4785
+        } else {
+            location.setWorld(worldserver.getWorld());
         }
+        WorldServer worldserver1 = ((CraftWorld) location.getWorld()).getHandle();
+        entityplayer1.forceSetPositionRotation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+        // CraftBukkit end
 
-        while (!worldserver1.getCubes(entityplayer1) && entityplayer1.locY() < (double) worldserver1.getMaxBuildHeight()) {
+        while (avoidSuffocation && !worldserver1.getCubes(entityplayer1) && entityplayer1.locY() < (double) worldserver1.getMaxBuildHeight()) {
             entityplayer1.setPosition(entityplayer1.locX(), entityplayer1.locY() + 1.0D, entityplayer1.locZ());
         }
+        // CraftBukkit start
+        WorldData worlddata = worldserver1.getWorldData();
+        entityplayer1.connection.sendPacket(new PacketPlayOutRespawn(worldserver1.getDimensionManager(), worldserver1.getDimensionKey(), BiomeManager.a(worldserver1.getSeed()), entityplayer1.gameMode.getGameMode(), entityplayer1.gameMode.c(), worldserver1.isDebugWorld(), worldserver1.isFlatWorld(), flag));
+        entityplayer1.spawnIn(worldserver1);
+        entityplayer1.unsetRemoved();
+        entityplayer1.connection.teleport(new Location(worldserver1.getWorld(), entityplayer1.locX(), entityplayer1.locY(), entityplayer1.locZ(), entityplayer1.getYRot(), entityplayer1.getXRot()));
+        entityplayer1.setSneaking(false);
 
-        WorldData worlddata = entityplayer1.level.getWorldData();
-
-        entityplayer1.connection.sendPacket(new PacketPlayOutRespawn(entityplayer1.level.getDimensionManager(), entityplayer1.level.getDimensionKey(), BiomeManager.a(entityplayer1.getWorldServer().getSeed()), entityplayer1.gameMode.getGameMode(), entityplayer1.gameMode.c(), entityplayer1.getWorldServer().isDebugWorld(), entityplayer1.getWorldServer().isFlatWorld(), flag));
-        entityplayer1.connection.b(entityplayer1.locX(), entityplayer1.locY(), entityplayer1.locZ(), entityplayer1.getYRot(), entityplayer1.getXRot());
+        // entityplayer1.connection.b(entityplayer1.locX(), entityplayer1.locY(), entityplayer1.locZ(), entityplayer1.getYRot(), entityplayer1.getXRot());
         entityplayer1.connection.sendPacket(new PacketPlayOutSpawnPosition(worldserver1.getSpawn(), worldserver1.x()));
         entityplayer1.connection.sendPacket(new PacketPlayOutServerDifficulty(worlddata.getDifficulty(), worlddata.isDifficultyLocked()));
         entityplayer1.connection.sendPacket(new PacketPlayOutExperience(entityplayer1.experienceProgress, entityplayer1.totalExperience, entityplayer1.experienceLevel));
         this.a(entityplayer1, worldserver1);
         this.d(entityplayer1);
-        worldserver1.addPlayerRespawn(entityplayer1);
-        this.players.add(entityplayer1);
-        this.playersByUUID.put(entityplayer1.getUniqueID(), entityplayer1);
-        entityplayer1.syncInventory();
+        if (!entityplayer.connection.isDisconnected()) {
+            worldserver1.addPlayerRespawn(entityplayer1);
+            this.players.add(entityplayer1);
+            this.playersByUUID.put(entityplayer1.getUniqueID(), entityplayer1);
+        }
+        // entityplayer1.syncInventory();
         entityplayer1.setHealth(entityplayer1.getHealth());
         if (flag2) {
             entityplayer1.connection.sendPacket(new PacketPlayOutNamedSoundEffect(SoundEffects.RESPAWN_ANCHOR_DEPLETE, SoundCategory.BLOCKS, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 1.0F, 1.0F));
         }
+        // Added from changeDimension
+        updateClient(entityplayer); // Update health, etc...
+        entityplayer.updateAbilities();
+        for (Object o1 : entityplayer.getEffects()) {
+            MobEffect mobEffect = (MobEffect) o1;
+            entityplayer.connection.sendPacket(new PacketPlayOutEntityEffect(entityplayer.getId(), mobEffect));
+        }
+
+        // Fire advancement trigger
+        entityplayer.triggerDimensionAdvancements(((CraftWorld) fromWorld).getHandle());
+
+        // Don't fire on respawn
+        if (fromWorld != location.getWorld()) {
+            PlayerChangedWorldEvent event = new PlayerChangedWorldEvent(entityplayer.getBukkitEntity(), fromWorld);
+            server.server.getPluginManager().callEvent(event);
+        }
 
+        // Save player file again if they were disconnected
+        if (entityplayer.connection.isDisconnected()) {
+            this.savePlayerFile(entityplayer);
+        }
+        // CraftBukkit end
         return entityplayer1;
     }
 
@@ -548,7 +788,18 @@
 
     public void tick() {
         if (++this.sendAllPlayerInfoIn > 600) {
-            this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_LATENCY, this.players));
+            // CraftBukkit start
+            for (int i = 0; i < this.players.size(); ++i) {
+                final EntityPlayer target = (EntityPlayer) this.players.get(i);
+
+                target.connection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_LATENCY, this.players.stream().filter(new Predicate<EntityPlayer>() {
+                    @Override
+                    public boolean apply(EntityPlayer input) {
+                        return target.getBukkitEntity().canSee(input.getBukkitEntity());
+                    }
+                }).collect(Collectors.toList())));
+            }
+            // CraftBukkit end
             this.sendAllPlayerInfoIn = 0;
         }
 
@@ -565,6 +816,25 @@
 
     }
 
+    // CraftBukkit start - add a world/entity limited version
+    public void sendAll(Packet packet, EntityHuman entityhuman) {
+        for (int i = 0; i < this.players.size(); ++i) {
+            EntityPlayer entityplayer =  this.players.get(i);
+            if (entityhuman != null && entityhuman instanceof EntityPlayer && !entityplayer.getBukkitEntity().canSee(((EntityPlayer) entityhuman).getBukkitEntity())) {
+                continue;
+            }
+            ((EntityPlayer) this.players.get(i)).connection.sendPacket(packet);
+        }
+    }
+
+    public void sendAll(Packet packet, World world) {
+        for (int i = 0; i < world.getPlayers().size(); ++i) {
+            ((EntityPlayer) world.getPlayers().get(i)).connection.sendPacket(packet);
+        }
+
+    }
+    // CraftBukkit end
+
     public void a(Packet<?> packet, ResourceKey<World> resourcekey) {
         Iterator iterator = this.players.iterator();
 
@@ -667,6 +937,7 @@
             entityplayer.connection.sendPacket(new PacketPlayOutEntityStatus(entityplayer, b0));
         }
 
+        entityplayer.getBukkitEntity().recalculatePermissions(); // CraftBukkit
         this.server.getCommandDispatcher().a(entityplayer);
     }
 
@@ -699,6 +970,12 @@
         for (int i = 0; i < this.players.size(); ++i) {
             EntityPlayer entityplayer = (EntityPlayer) this.players.get(i);
 
+            // CraftBukkit start - Test if player receiving packet can see the source of the packet
+            if (entityhuman != null && entityhuman instanceof EntityPlayer && !entityplayer.getBukkitEntity().canSee(((EntityPlayer) entityhuman).getBukkitEntity())) {
+               continue;
+            }
+            // CraftBukkit end
+
             if (entityplayer != entityhuman && entityplayer.level.getDimensionKey() == resourcekey) {
                 double d4 = d0 - entityplayer.locX();
                 double d5 = d1 - entityplayer.locY();
@@ -738,23 +1015,34 @@
     public void reloadWhitelist() {}
 
     public void a(EntityPlayer entityplayer, WorldServer worldserver) {
-        WorldBorder worldborder = this.server.F().getWorldBorder();
+        WorldBorder worldborder = entityplayer.level.getWorldBorder(); // CraftBukkit
 
         entityplayer.connection.sendPacket(new ClientboundInitializeBorderPacket(worldborder));
         entityplayer.connection.sendPacket(new PacketPlayOutUpdateTime(worldserver.getTime(), worldserver.getDayTime(), worldserver.getGameRules().getBoolean(GameRules.RULE_DAYLIGHT)));
         entityplayer.connection.sendPacket(new PacketPlayOutSpawnPosition(worldserver.getSpawn(), worldserver.x()));
         if (worldserver.isRaining()) {
-            entityplayer.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.START_RAINING, 0.0F));
-            entityplayer.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.RAIN_LEVEL_CHANGE, worldserver.d(1.0F)));
-            entityplayer.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.THUNDER_LEVEL_CHANGE, worldserver.b(1.0F)));
+            // CraftBukkit start - handle player weather
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.b, 0.0F));
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.h, worldserver.d(1.0F)));
+            // entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.i, worldserver.b(1.0F)));
+            entityplayer.setPlayerWeather(org.bukkit.WeatherType.DOWNFALL, false);
+            entityplayer.updateWeather(-worldserver.rainLevel, worldserver.rainLevel, -worldserver.thunderLevel, worldserver.thunderLevel);
+            // CraftBukkit end
         }
 
     }
 
     public void updateClient(EntityPlayer entityplayer) {
         entityplayer.inventoryMenu.updateInventory();
-        entityplayer.triggerHealthUpdate();
+        // entityplayer.triggerHealthUpdate();
+        entityplayer.getBukkitEntity().updateScaledHealth(); // CraftBukkit - Update scaled health on respawn and worldchange
         entityplayer.connection.sendPacket(new PacketPlayOutHeldItemSlot(entityplayer.getInventory().selected));
+        // CraftBukkit start - from GameRules
+        int i = entityplayer.level.getGameRules().getBoolean(GameRules.RULE_REDUCEDDEBUGINFO) ? 22 : 23;
+        entityplayer.connection.sendPacket(new PacketPlayOutEntityStatus(entityplayer, (byte) i));
+        float immediateRespawn = entityplayer.level.getGameRules().getBoolean(GameRules.RULE_DO_IMMEDIATE_RESPAWN) ? 1.0F: 0.0F;
+        entityplayer.connection.sendPacket(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.IMMEDIATE_RESPAWN, immediateRespawn));
+        // CraftBukkit end
     }
 
     public int getPlayerCount() {
@@ -805,12 +1093,22 @@
     }
 
     public void shutdown() {
-        for (int i = 0; i < this.players.size(); ++i) {
-            ((EntityPlayer) this.players.get(i)).connection.disconnect(new ChatMessage("multiplayer.disconnect.server_shutdown"));
+        // CraftBukkit start - disconnect safely
+        for (EntityPlayer player : this.players) {
+            player.connection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
         }
+        // CraftBukkit end
 
     }
 
+    // CraftBukkit start
+    public void sendMessage(IChatBaseComponent[] iChatBaseComponents) {
+        for (IChatBaseComponent component : iChatBaseComponents) {
+            sendMessage(component, ChatMessageType.SYSTEM, SystemUtils.NIL_UUID);
+        }
+    }
+    // CraftBukkit end
+
     public void sendMessage(IChatBaseComponent ichatbasecomponent, ChatMessageType chatmessagetype, UUID uuid) {
         this.server.sendMessage(ichatbasecomponent, uuid);
         Iterator iterator = this.players.iterator();
@@ -838,16 +1136,23 @@
 
     }
 
-    public ServerStatisticManager getStatisticManager(EntityHuman entityhuman) {
-        UUID uuid = entityhuman.getUniqueID();
-        ServerStatisticManager serverstatisticmanager = uuid == null ? null : (ServerStatisticManager) this.stats.get(uuid);
+    // CraftBukkit start
+    public ServerStatisticManager getStatisticManager(EntityPlayer entityhuman) {
+        ServerStatisticManager serverstatisticmanager = entityhuman.getStatisticManager();
+        return serverstatisticmanager == null ? getStatisticManager(entityhuman.getUniqueID(), entityhuman.getDisplayName().getString()) : serverstatisticmanager;
+    }
+
+    public ServerStatisticManager getStatisticManager(UUID uuid, String displayName) {
+        EntityPlayer entityhuman = this.getPlayer(uuid);
+        ServerStatisticManager serverstatisticmanager = entityhuman == null ? null : (ServerStatisticManager) entityhuman.getStatisticManager();
+        // CraftBukkit end
 
         if (serverstatisticmanager == null) {
             File file = this.server.a(SavedFile.PLAYER_STATS_DIR).toFile();
             File file1 = new File(file, uuid + ".json");
 
             if (!file1.exists()) {
-                File file2 = new File(file, entityhuman.getDisplayName().getString() + ".json");
+                File file2 = new File(file, displayName + ".json"); // CraftBukkit
 
                 if (file2.exists() && file2.isFile()) {
                     file2.renameTo(file1);
@@ -855,7 +1160,7 @@
             }
 
             serverstatisticmanager = new ServerStatisticManager(this.server, file1);
-            this.stats.put(uuid, serverstatisticmanager);
+            // this.o.put(uuid, serverstatisticmanager); // CraftBukkit
         }
 
         return serverstatisticmanager;
@@ -863,14 +1168,14 @@
 
     public AdvancementDataPlayer f(EntityPlayer entityplayer) {
         UUID uuid = entityplayer.getUniqueID();
-        AdvancementDataPlayer advancementdataplayer = (AdvancementDataPlayer) this.advancements.get(uuid);
+        AdvancementDataPlayer advancementdataplayer = (AdvancementDataPlayer) entityplayer.getAdvancementData(); // CraftBukkit
 
         if (advancementdataplayer == null) {
             File file = this.server.a(SavedFile.PLAYER_ADVANCEMENTS_DIR).toFile();
             File file1 = new File(file, uuid + ".json");
 
             advancementdataplayer = new AdvancementDataPlayer(this.server.getDataFixer(), this, this.server.getAdvancementData(), file1, entityplayer);
-            this.advancements.put(uuid, advancementdataplayer);
+            // this.p.put(uuid, advancementdataplayer); // CraftBukkit
         }
 
         advancementdataplayer.a(entityplayer);
@@ -906,13 +1211,20 @@
     }
 
     public void reload() {
-        Iterator iterator = this.advancements.values().iterator();
+        // CraftBukkit start
+        /*Iterator iterator = this.p.values().iterator();
 
         while (iterator.hasNext()) {
             AdvancementDataPlayer advancementdataplayer = (AdvancementDataPlayer) iterator.next();
 
             advancementdataplayer.a(this.server.getAdvancementData());
+        }*/
+
+        for (EntityPlayer player : players) {
+            player.getAdvancementData().a(this.server.getAdvancementData());
+            player.getAdvancementData().b(player); // CraftBukkit - trigger immediate flush of advancements
         }
+        // CraftBukkit end
 
         this.sendAll(new PacketPlayOutTags(this.server.getTagRegistry().a((IRegistryCustom) this.registryHolder)));
         PacketPlayOutRecipeUpdate packetplayoutrecipeupdate = new PacketPlayOutRecipeUpdate(this.server.getCraftingManager().b());