Edit readme

Better Packet Limiter

README.md

@@ -1,20 +1,20 @@
 ## NanoLimbo
 
-This is lightweight minecraft limbo server, written on Java with Netty.
-The main goal of the project is maximum simplicity with a minimum number of sent and processed packets.
-This limbo is empty, there are no ability to set schematic building since 
-this is not necessary. You can send useful information in chat or BossBar.
+This is a lightweight Minecraft limbo server, written in Java with Netty.
+The main goal of this project is maximum simplicity with a minimum number of sent and processed packets.
+The limbo is empty; there is no ability to set a schematic building since this is not necessary.
+You can send useful information via chat or boss bar.
 
-No plugins, no logs. The server is fully clear. It only able keep a lot of players while the main server is down.
+The server is fully clear. It is only able to keep a lot of players while the main server is down.
 
-The general features:
-* High performance. The server not saves and not cached any useless (for limbo) data.
-* Doesn't spawn threads per player. Uses fixed threads pool.
+General features:
+* High performance. The server doesn't save or cache any useless (for limbo) data.
+* Doesn't spawn threads per player. Use a fixed thread pool.
 * Support for **BungeeCord** and **Velocity** info forwarding.
 * Support for [BungeeGuard](https://www.spigotmc.org/resources/79601/) handshake format.
 * Multiple versions support.
 * Fully configurable.
-* Lightweight. App size around **2MB.**
+* Lightweight. App size around **3MB**.
 
 ![](https://i.imgur.com/sT8p1Gz.png)
 
@@ -22,6 +22,7 @@ The general features:
 
 Symbol `X` means all minor versions.
 
+- [x] 1.7.X
 - [x] 1.8.X
 - [x] 1.9.X
 - [x] 1.10.X
@@ -32,26 +33,36 @@ Symbol `X` means all minor versions.
 - [x] 1.15.X
 - [x] 1.16.X
 - [x] 1.17.X
-- [x] 1.18
+- [x] 1.18.X
+- [x] 1.19.X
+- [x] 1.20.X
+- [x] 1.21
 
 The server **doesn't** support snapshots.
 
 ### Commands
 
-There are no commands. To close server just run `Ctrl+C` in the terminal. It will be closed correctly.
+* `help` - Show help message
+* `conn` - Display number of connections
+* `mem` - Display memory usage stats
+* `stop` - Stop the server
+
+Note that the server also will be closed correctly if you just press `Ctrl+C`.
 
 ### Installation
 
+Required software: JRE 11+
+
 The installation process is simple.
 
-1. Download the latest version of program **[here](https://github.com/Nan1t/NanoLimbo/releases)**
-2. Put jar file in the folder you want.
-3. Create a start script as you did it for Bukkit or BungeeCord with command like this:
+1. Download the latest version of the program [**here**](https://github.com/Nan1t/NanoLimbo/releases).
+2. Put the jar file in the folder you want.
+3. Create a start script as you did for Bukkit or BungeeCord, with a command like this:
    `java -jar NanoLimbo-<version>.jar`
-4. The server will create `settings.yml` file. It's a server configuration.
-5. Configure it as you want and restart server.
+4. The server will create `settings.yml` file, which is the server configuration. 
+5. Configure it as you want and restart the server.
 
-### About player info forwarding
+### Player info forwarding
 
 The server supports player info forwarding from the proxy. There are several types of info forwarding:
 
@@ -60,29 +71,29 @@ The server supports player info forwarding from the proxy. There are several typ
 * `BUNGEE_GUARD` - **BungeeGuard** forwarding type.
 
 If you use BungeeCord, or Velocity with `LEGACY` forwarding, just set this type in the config.  
-If you use Velocity with `MODERN` info forwarding, set this type and paste secret key from Velocity 
-config into `secret` field.
+If you use Velocity with `MODERN` info forwarding, set this type and paste the secret key from
+Velocity config into `secret` field.
 If you installed BungeeGuard on your proxy, then use `BUNGEE_GUARD` forwarding type.
 Then add your tokens to `tokens` list.
 
 ### Contributing
 
-You can create pull request, if you found some bug, optimization ability, or you want to add some functional, 
-which is suitable for limbo server and won't significantly load the server.
+Feel free to create a pull request if you find some bug or optimization opportunity, or if you want
+to add some functionality that is suitable for a limbo server and won't significantly load the server.
 
 ### Building
 
 Required software:
 
-* JDK 1.8+
-* Gradle 7+
+* JDK 11+
+* Gradle 7+ (optional)
 
-To build minimized .jar, go to project root and write in terminal:
+To build a minimized jar, go to the project root directory and run in the terminal:
 
 ```
-gradlew shadowJar
+./gradlew shadowJar
 ```
 
 ### Contacts
 
-If you have any question or suggestion, join to [Discord server](https://discord.gg/4VGP3Gv)
+If you have any questions or suggestions, join our [Discord server](https://discord.gg/4VGP3Gv)!

build.gradle

@@ -1,33 +1,53 @@
 plugins {
     id 'java'
-    id 'com.github.johnrengelman.shadow' version '7.0.0'
+    id 'com.github.johnrengelman.shadow' version '7.1.2'
+    id 'com.github.gmazzo.buildconfig' version '3.1.0'
 }
 
-group 'ru.nanit'
-version '1.3.4'
+group 'ua.nanit'
+version '1.8.1'
+
+compileJava {
+    options.encoding = "UTF-8"
+}
+
+tasks.withType(JavaCompile).configureEach {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
 
 repositories {
     mavenCentral()
 }
 
 dependencies {
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.3'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.3'
 
+    implementation 'ch.qos.logback:logback-classic:1.5.6'
     implementation 'org.spongepowered:configurate-yaml:4.1.2'
-    implementation 'io.netty:netty-all:4.1.73.Final'
-    implementation 'net.kyori:adventure-nbt:4.9.2'
-    implementation 'com.grack:nanojson:1.7'
+    implementation 'io.netty:netty-all:4.1.101.Final'
+    implementation 'net.kyori:adventure-nbt:4.14.0'
+    implementation 'com.grack:nanojson:1.8'
+    implementation 'com.google.code.gson:gson:2.10.1'
+}
+
+buildConfig {
+    className("BuildConfig")
+    packageName("ua.nanit.limbo")
+    buildConfigField('String', 'LIMBO_VERSION', "\"${project.version}\"")
 }
 
 shadowJar {
     from 'LICENSE'
 
     manifest {
-        attributes('Main-Class': 'ru.nanit.limbo.NanoLimbo')
+        attributes('Main-Class': 'ua.nanit.limbo.NanoLimbo')
     }
 
-    minimize()
+    minimize {
+        exclude(dependency('ch.qos.logback:logback-classic:.*:.*'))
+    }
 }
 
 test {

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,67 +17,101 @@
 #
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
+APP_BASE_NAME=${0##*/}
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MSYS* | MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
@@ -87,9 +121,9 @@ CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -98,7 +132,7 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
+    JAVACMD=java
     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
@@ -106,80 +140,95 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=`expr $i + 1`
-    done
-    case $i in
-        0) set -- ;;
-        1) set -- "$args0" ;;
-        2) set -- "$args0" "$args1" ;;
-        3) set -- "$args0" "$args1" "$args2" ;;
-        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
 fi
 
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=`save "$@"`
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
 
 exec "$JAVACMD" "$@"

src/main/java/ru/nanit/limbo/connection/ClientConnection.java

@@ -1,510 +0,0 @@
-/*
- * Copyright (C) 2020 Nan1t
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package ru.nanit.limbo.connection;
-
-import com.grack.nanojson.JsonArray;
-import com.grack.nanojson.JsonObject;
-import com.grack.nanojson.JsonParser;
-import com.grack.nanojson.JsonParserException;
-import io.netty.buffer.Unpooled;
-import io.netty.channel.Channel;
-import io.netty.channel.ChannelFutureListener;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
-import ru.nanit.limbo.LimboConstants;
-import ru.nanit.limbo.connection.pipeline.PacketDecoder;
-import ru.nanit.limbo.connection.pipeline.PacketEncoder;
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketSnapshot;
-import ru.nanit.limbo.protocol.packets.PacketHandshake;
-import ru.nanit.limbo.protocol.packets.login.*;
-import ru.nanit.limbo.protocol.packets.play.*;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusPing;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusRequest;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusResponse;
-import ru.nanit.limbo.protocol.registry.State;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.LimboServer;
-import ru.nanit.limbo.server.data.Title;
-import ru.nanit.limbo.server.Logger;
-import ru.nanit.limbo.util.UuidUtil;
-
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-import java.net.InetSocketAddress;
-import java.net.SocketAddress;
-import java.security.InvalidKeyException;
-import java.security.MessageDigest;
-import java.util.Collections;
-import java.util.UUID;
-import java.util.concurrent.ThreadLocalRandom;
-
-public class ClientConnection extends ChannelInboundHandlerAdapter {
-
-    private static PacketSnapshot PACKET_LOGIN_SUCCESS;
-    private static PacketSnapshot PACKET_JOIN_GAME;
-    private static PacketSnapshot PACKET_PLUGIN_MESSAGE;
-    private static PacketSnapshot PACKET_PLAYER_ABILITIES;
-    private static PacketSnapshot PACKET_PLAYER_INFO;
-    private static PacketSnapshot PACKET_DECLARE_COMMANDS;
-    private static PacketSnapshot PACKET_PLAYER_POS;
-    private static PacketSnapshot PACKET_JOIN_MESSAGE;
-    private static PacketSnapshot PACKET_BOSS_BAR;
-    private static PacketSnapshot PACKET_HEADER_AND_FOOTER;
-
-    private static PacketSnapshot PACKET_TITLE_TITLE;
-    private static PacketSnapshot PACKET_TITLE_SUBTITLE;
-    private static PacketSnapshot PACKET_TITLE_TIMES;
-
-    private static PacketSnapshot PACKET_TITLE_LEGACY_TITLE;
-    private static PacketSnapshot PACKET_TITLE_LEGACY_SUBTITLE;
-    private static PacketSnapshot PACKET_TITLE_LEGACY_TIMES;
-
-    private final LimboServer server;
-    private final Channel channel;
-    private final GameProfile gameProfile;
-
-    private final PacketDecoder decoder;
-    private final PacketEncoder encoder;
-
-    private State state;
-    private Version clientVersion;
-    private SocketAddress address;
-
-    private int velocityLoginMessageId = -1;
-
-    public ClientConnection(Channel channel, LimboServer server, PacketDecoder decoder, PacketEncoder encoder) {
-        this.server = server;
-        this.channel = channel;
-        this.decoder = decoder;
-        this.encoder = encoder;
-        this.address = channel.remoteAddress();
-        this.gameProfile = new GameProfile();
-    }
-
-    public UUID getUuid() {
-        return gameProfile.getUuid();
-    }
-
-    public String getUsername() {
-        return gameProfile.getUsername();
-    }
-
-    public SocketAddress getAddress() {
-        return address;
-    }
-
-    public Version getClientVersion() {
-        return clientVersion;
-    }
-
-    @Override
-    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
-        if (state.equals(State.PLAY)) {
-            server.getConnections().removeConnection(this);
-        }
-        super.channelInactive(ctx);
-    }
-
-    @Override
-    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
-        if (channel.isActive()) {
-            Logger.error("Unhandled exception: ", cause);
-        }
-    }
-
-    @Override
-    public void channelRead(ChannelHandlerContext ctx, Object msg) {
-        handlePacket(msg);
-    }
-
-    public void handlePacket(Object packet) {
-        if (packet instanceof PacketHandshake) {
-            PacketHandshake handshake = (PacketHandshake) packet;
-            clientVersion = handshake.getVersion();
-
-            updateStateAndVersion(handshake.getNextState(), clientVersion);
-
-            Logger.debug("Pinged from %s [%s]", address, clientVersion.toString());
-
-            if (server.getConfig().getInfoForwarding().isLegacy()) {
-                String[] split = handshake.getHost().split("\00");
-
-                if (split.length == 3 || split.length == 4) {
-                    setAddress(split[1]);
-                    gameProfile.setUuid(UuidUtil.fromString(split[2]));
-                } else {
-                    disconnectLogin("You've enabled player info forwarding. You need to connect with proxy");
-                }
-            } else if (server.getConfig().getInfoForwarding().isBungeeGuard()) {
-                if (!checkBungeeGuardHandshake(handshake.getHost())) {
-                    disconnectLogin("Invalid BungeeGuard token or handshake format");
-                }
-            }
-            return;
-        }
-
-        if (packet instanceof PacketStatusRequest) {
-            sendPacket(new PacketStatusResponse(server));
-            return;
-        }
-
-        if (packet instanceof PacketStatusPing) {
-            sendPacketAndClose(packet);
-            return;
-        }
-
-        if (packet instanceof PacketLoginStart) {
-            if (server.getConfig().getMaxPlayers() > 0 &&
-                    server.getConnections().getCount() >= server.getConfig().getMaxPlayers()) {
-                disconnectLogin("Too many players connected");
-                return;
-            }
-
-            if (!clientVersion.isSupported()) {
-                disconnectLogin("Unsupported client version");
-                return;
-            }
-
-            if (server.getConfig().getInfoForwarding().isModern()) {
-                velocityLoginMessageId = ThreadLocalRandom.current().nextInt(0, Integer.MAX_VALUE);
-                PacketLoginPluginRequest request = new PacketLoginPluginRequest();
-                request.setMessageId(velocityLoginMessageId);
-                request.setChannel(LimboConstants.VELOCITY_INFO_CHANNEL);
-                request.setData(Unpooled.EMPTY_BUFFER);
-                sendPacket(request);
-                return;
-            }
-
-            if (!server.getConfig().getInfoForwarding().isModern()) {
-                gameProfile.setUsername(((PacketLoginStart)packet).getUsername());
-                gameProfile.setUuid(UuidUtil.getOfflineModeUuid(getUsername()));
-            }
-
-            fireLoginSuccess();
-            return;
-        }
-
-        if (packet instanceof PacketLoginPluginResponse) {
-            PacketLoginPluginResponse response = (PacketLoginPluginResponse) packet;
-
-            if (server.getConfig().getInfoForwarding().isModern()
-                    && response.getMessageId() == velocityLoginMessageId) {
-
-                if (!response.isSuccessful() || response.getData() == null) {
-                    disconnectLogin("You need to connect with Velocity");
-                    return;
-                }
-
-                if (!checkVelocityKeyIntegrity(response.getData())) {
-                    disconnectLogin("Can't verify forwarded player info");
-                    return;
-                }
-
-                // Order is important
-                setAddress(response.getData().readString());
-                gameProfile.setUuid(response.getData().readUuid());
-                gameProfile.setUsername(response.getData().readString());
-
-                fireLoginSuccess();
-            }
-        }
-    }
-
-    private void fireLoginSuccess() {
-        if (server.getConfig().getInfoForwarding().isModern() && velocityLoginMessageId == -1) {
-            disconnectLogin("You need to connect with Velocity");
-            return;
-        }
-
-        writePacket(PACKET_LOGIN_SUCCESS);
-        setPlayState();
-
-        server.getConnections().addConnection(this);
-
-        writePacket(PACKET_JOIN_GAME);
-        writePacket(PACKET_PLAYER_ABILITIES);
-        writePacket(PACKET_PLAYER_POS);
-
-        if (server.getConfig().isUsePlayerList() || clientVersion.equals(Version.V1_16_4))
-            writePacket(PACKET_PLAYER_INFO);
-
-        if (clientVersion.moreOrEqual(Version.V1_13)) {
-            writePacket(PACKET_DECLARE_COMMANDS);
-
-            if (PACKET_PLUGIN_MESSAGE != null)
-                writePacket(PACKET_PLUGIN_MESSAGE);
-        }
-
-        if (PACKET_BOSS_BAR != null && clientVersion.moreOrEqual(Version.V1_9))
-            writePacket(PACKET_BOSS_BAR);
-
-        if (PACKET_JOIN_MESSAGE != null)
-            writePacket(PACKET_JOIN_MESSAGE);
-
-        if (PACKET_TITLE_TITLE != null)
-            writeTitle();
-
-        if (PACKET_HEADER_AND_FOOTER != null)
-            writePacket(PACKET_HEADER_AND_FOOTER);
-
-        sendKeepAlive();
-    }
-
-    public void disconnectLogin(String reason) {
-        if (isConnected() && state == State.LOGIN) {
-            PacketDisconnect disconnect = new PacketDisconnect();
-            disconnect.setReason(reason);
-            sendPacketAndClose(disconnect);
-        }
-    }
-
-    public void writeTitle() {
-        if (clientVersion.moreOrEqual(Version.V1_17)) {
-            writePacket(PACKET_TITLE_TITLE);
-            writePacket(PACKET_TITLE_SUBTITLE);
-            writePacket(PACKET_TITLE_TIMES);
-        } else {
-            writePacket(PACKET_TITLE_LEGACY_TITLE);
-            writePacket(PACKET_TITLE_LEGACY_SUBTITLE);
-            writePacket(PACKET_TITLE_LEGACY_TIMES);
-        }
-    }
-
-    public void sendKeepAlive() {
-        if (state.equals(State.PLAY)) {
-            PacketKeepAlive keepAlive = new PacketKeepAlive();
-            keepAlive.setId(ThreadLocalRandom.current().nextLong());
-            sendPacket(keepAlive);
-        }
-    }
-
-    public void sendPacket(Object packet) {
-        if (isConnected())
-            channel.writeAndFlush(packet, channel.voidPromise());
-    }
-
-    public void sendPacketAndClose(Object packet) {
-        if (isConnected())
-            channel.writeAndFlush(packet).addListener(ChannelFutureListener.CLOSE);
-    }
-
-    public void writePacket(Object packet) {
-        if (isConnected())
-            channel.write(packet, channel.voidPromise());
-    }
-
-    public boolean isConnected() {
-        return channel.isActive();
-    }
-
-    private void setPlayState() {
-        this.state = State.PLAY;
-        decoder.updateState(this.state);
-        encoder.updateState(this.state);
-    }
-
-    public void updateStateAndVersion(State state, Version version) {
-        this.state = state;
-        decoder.updateVersion(version);
-        decoder.updateState(state);
-        encoder.updateVersion(version);
-        encoder.updateState(state);
-    }
-
-    private void setAddress(String host) {
-        this.address = new InetSocketAddress(host, ((InetSocketAddress)this.address).getPort());
-    }
-
-    private boolean checkBungeeGuardHandshake(String handshake) {
-        String[] split = handshake.split("\00");
-
-        if (split.length != 4)
-            return false;
-
-        String socketAddressHostname = split[1];
-        UUID uuid = UuidUtil.fromString(split[2]);
-        JsonArray arr;
-
-        try {
-            arr = JsonParser.array().from(split[3]);
-        } catch (JsonParserException e) {
-            return false;
-        }
-
-        String token = null;
-
-        for (Object obj : arr) {
-            if (obj instanceof JsonObject) {
-                JsonObject prop = (JsonObject) obj;
-                if (prop.getString("name").equals("bungeeguard-token")) {
-                    token = prop.getString("value");
-                    break;
-                }
-            }
-        }
-
-        if (!server.getConfig().getInfoForwarding().hasToken(token))
-            return false;
-
-        setAddress(socketAddressHostname);
-        gameProfile.setUuid(uuid);
-
-        Logger.debug("Successfully verified BungeeGuard token");
-
-        return true;
-    }
-
-    private boolean checkVelocityKeyIntegrity(ByteMessage buf) {
-        byte[] signature = new byte[32];
-        buf.readBytes(signature);
-        byte[] data = new byte[buf.readableBytes()];
-        buf.getBytes(buf.readerIndex(), data);
-        try {
-            Mac mac = Mac.getInstance("HmacSHA256");
-            mac.init(new SecretKeySpec(server.getConfig().getInfoForwarding().getSecretKey(), "HmacSHA256"));
-            byte[] mySignature = mac.doFinal(data);
-            if (!MessageDigest.isEqual(signature, mySignature))
-                return false;
-        } catch (InvalidKeyException |java.security.NoSuchAlgorithmException e) {
-            throw new AssertionError(e);
-        }
-        int version = buf.readVarInt();
-        if (version != 1)
-            throw new IllegalStateException("Unsupported forwarding version " + version + ", wanted " + '\001');
-        return true;
-    }
-
-    public static void initPackets(LimboServer server) {
-        final String username = server.getConfig().getPingData().getVersion();
-        final UUID uuid = UuidUtil.getOfflineModeUuid(username);
-
-        PacketLoginSuccess loginSuccess = new PacketLoginSuccess();
-        loginSuccess.setUsername(username);
-        loginSuccess.setUuid(uuid);
-
-        PacketJoinGame joinGame = new PacketJoinGame();
-        joinGame.setEntityId(0);
-        joinGame.setEnableRespawnScreen(true);
-        joinGame.setFlat(false);
-        joinGame.setGameMode(server.getConfig().getGameMode());
-        joinGame.setHardcore(false);
-        joinGame.setMaxPlayers(server.getConfig().getMaxPlayers());
-        joinGame.setPreviousGameMode(-1);
-        joinGame.setReducedDebugInfo(true);
-        joinGame.setDebug(false);
-        joinGame.setViewDistance(0);
-        joinGame.setWorldName("minecraft:world");
-        joinGame.setWorldNames("minecraft:world");
-        joinGame.setHashedSeed(0);
-        joinGame.setDimensionRegistry(server.getDimensionRegistry());
-
-        PacketPlayerAbilities playerAbilities = new PacketPlayerAbilities();
-        playerAbilities.setFlyingSpeed(0.0F);
-        playerAbilities.setFlags(0x02);
-        playerAbilities.setFieldOfView(0.1F);
-
-        PacketPlayerPositionAndLook positionAndLook = new PacketPlayerPositionAndLook();
-        positionAndLook.setX(server.getConfig().getSpawnPosition().getX());
-        positionAndLook.setY(server.getConfig().getSpawnPosition().getY());
-        positionAndLook.setZ(server.getConfig().getSpawnPosition().getZ());
-        positionAndLook.setYaw(server.getConfig().getSpawnPosition().getYaw());
-        positionAndLook.setPitch(server.getConfig().getSpawnPosition().getPitch());
-        positionAndLook.setTeleportId(ThreadLocalRandom.current().nextInt());
-
-        PacketDeclareCommands declareCommands = new PacketDeclareCommands();
-        declareCommands.setCommands(Collections.emptyList());
-
-        PacketPlayerInfo info = new PacketPlayerInfo();
-        info.setUsername(server.getConfig().getPlayerListUsername());
-        info.setGameMode(server.getConfig().getGameMode());
-        info.setUuid(uuid);
-
-        PACKET_LOGIN_SUCCESS = PacketSnapshot.of(loginSuccess);
-        PACKET_JOIN_GAME = PacketSnapshot.of(joinGame);
-        PACKET_PLAYER_ABILITIES = PacketSnapshot.of(playerAbilities);
-        PACKET_PLAYER_POS = PacketSnapshot.of(positionAndLook);
-        PACKET_PLAYER_INFO = PacketSnapshot.of(info);
-
-        PACKET_DECLARE_COMMANDS = PacketSnapshot.of(declareCommands);
-
-        if (server.getConfig().isUseHeaderAndFooter()) {
-            PacketPlayerListHeader header = new PacketPlayerListHeader();
-            header.setHeader(server.getConfig().getPlayerListHeader());
-            header.setFooter(server.getConfig().getPlayerListFooter());
-            PACKET_HEADER_AND_FOOTER = PacketSnapshot.of(header);
-        }
-
-        if (server.getConfig().isUseBrandName()){
-            PacketPluginMessage pluginMessage = new PacketPluginMessage();
-            pluginMessage.setChannel(LimboConstants.BRAND_CHANNEL);
-            pluginMessage.setMessage(server.getConfig().getBrandName());
-            PACKET_PLUGIN_MESSAGE = PacketSnapshot.of(pluginMessage);
-        }
-
-        if (server.getConfig().isUseJoinMessage()) {
-            PacketChatMessage joinMessage = new PacketChatMessage();
-            joinMessage.setJsonData(server.getConfig().getJoinMessage());
-            joinMessage.setPosition(PacketChatMessage.Position.CHAT);
-            joinMessage.setSender(UUID.randomUUID());
-            PACKET_JOIN_MESSAGE = PacketSnapshot.of(joinMessage);
-        }
-
-        if (server.getConfig().isUseBossBar()) {
-            PacketBossBar bossBar = new PacketBossBar();
-            bossBar.setBossBar(server.getConfig().getBossBar());
-            bossBar.setUuid(UUID.randomUUID());
-            PACKET_BOSS_BAR = PacketSnapshot.of(bossBar);
-        }
-
-        if (server.getConfig().isUseTitle()) {
-            Title title = server.getConfig().getTitle();
-
-            PacketTitleSetTitle packetTitle = new PacketTitleSetTitle();
-            PacketTitleSetSubTitle packetSubtitle = new PacketTitleSetSubTitle();
-            PacketTitleTimes packetTimes = new PacketTitleTimes();
-
-            PacketTitleLegacy legacyTitle = new PacketTitleLegacy();
-            PacketTitleLegacy legacySubtitle = new PacketTitleLegacy();
-            PacketTitleLegacy legacyTimes = new PacketTitleLegacy();
-
-            packetTitle.setTitle(title.getTitle());
-            packetSubtitle.setSubtitle(title.getSubtitle());
-            packetTimes.setFadeIn(title.getFadeIn());
-            packetTimes.setStay(title.getStay());
-            packetTimes.setFadeOut(title.getFadeOut());
-
-            legacyTitle.setTitle(title);
-            legacyTitle.setAction(PacketTitleLegacy.Action.SET_TITLE);
-
-            legacySubtitle.setTitle(title);
-            legacySubtitle.setAction(PacketTitleLegacy.Action.SET_SUBTITLE);
-
-            legacyTimes.setTitle(title);
-            legacyTimes.setAction(PacketTitleLegacy.Action.SET_TIMES_AND_DISPLAY);
-
-            PACKET_TITLE_TITLE = PacketSnapshot.of(packetTitle);
-            PACKET_TITLE_SUBTITLE = PacketSnapshot.of(packetSubtitle);
-            PACKET_TITLE_TIMES = PacketSnapshot.of(packetTimes);
-
-            PACKET_TITLE_LEGACY_TITLE = PacketSnapshot.of(legacyTitle);
-            PACKET_TITLE_LEGACY_SUBTITLE = PacketSnapshot.of(legacySubtitle);
-            PACKET_TITLE_LEGACY_TIMES = PacketSnapshot.of(legacyTimes);
-        }
-    }
-}

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketPlayerInfo.java

@@ -1,59 +0,0 @@
-/*
- * Copyright (C) 2020 Nan1t
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package ru.nanit.limbo.protocol.packets.play;
-
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
-
-import java.util.UUID;
-
-/**
- * This packet was very simplified and using only for ADD_PLAYER action
- */
-public class PacketPlayerInfo implements PacketOut {
-
-    private int gameMode = 3;
-    private String username = "";
-    private UUID uuid;
-
-    public void setGameMode(int gameMode) {
-        this.gameMode = gameMode;
-    }
-
-    public void setUsername(String username) {
-        this.username = username;
-    }
-
-    public void setUuid(UUID uuid) {
-        this.uuid = uuid;
-    }
-
-    @Override
-    public void encode(ByteMessage msg, Version version) {
-        msg.writeVarInt(0); // Add player action
-        msg.writeVarInt(1);
-        msg.writeUuid(uuid);
-        msg.writeString(username);
-        msg.writeVarInt(0);
-        msg.writeVarInt(gameMode);
-        msg.writeVarInt(60);
-        msg.writeBoolean(false);
-    }
-
-}

src/main/java/ru/nanit/limbo/world/Location.java

@@ -1,106 +0,0 @@
-/*
- * Copyright (C) 2020 Nan1t
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package ru.nanit.limbo.world;
-
-import org.checkerframework.checker.nullness.qual.Nullable;
-import org.spongepowered.configurate.ConfigurationNode;
-import org.spongepowered.configurate.serialize.TypeSerializer;
-
-import java.lang.reflect.Type;
-
-public class Location {
-
-    private final double x;
-    private final double y;
-    private final double z;
-    private final float yaw;
-    private final float pitch;
-
-    Location(double x, double y, double z, float yaw, float pitch) {
-        this.x = x;
-        this.y = y;
-        this.z = z;
-        this.yaw = yaw;
-        this.pitch = pitch;
-    }
-
-    Location(double x, double y, double z) {
-        this(x, y, z, 0.0F, 0.0F);
-    }
-
-    public double getX() {
-        return x;
-    }
-
-    public int getBlockX() {
-        return (int) x;
-    }
-
-    public double getY() {
-        return y;
-    }
-
-    public int getBlockY() {
-        return (int) y;
-    }
-
-    public double getZ() {
-        return z;
-    }
-
-    public int getBlockZ() {
-        return (int) z;
-    }
-
-    public float getYaw() {
-        return yaw;
-    }
-
-    public float getPitch() {
-        return pitch;
-    }
-
-    public static Location of(double x, double y, double z) {
-        return new Location(x, y, z);
-    }
-
-    public static Location of(double x, double y, double z, float yaw, float pitch) {
-        return new Location(x, y, z, yaw, pitch);
-    }
-
-    public static Location pos(int x, int y, int z) {
-        return new Location(x, y, z);
-    }
-
-    public static class Serializer implements TypeSerializer<Location> {
-
-        @Override
-        public Location deserialize(Type type, ConfigurationNode node) {
-            double x = node.node("x").getDouble(0);
-            double y = node.node("y").getDouble(0);
-            double z = node.node("z").getDouble(0);
-            float yaw = node.node("yaw").getFloat(0.0F);
-            float pitch = node.node("pitch").getFloat(0.0F);
-
-            return new Location(x, y, z, yaw, pitch);
-        }
-
-        @Override
-        public void serialize(Type type, @Nullable Location obj, ConfigurationNode node) { }
-    }
-}

src/main/java/ru/nanit/limbo/world/dimension/DimensionRegistry.java

@@ -1,103 +0,0 @@
-/*
- * Copyright (C) 2020 Nan1t
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package ru.nanit.limbo.world.dimension;
-
-import net.kyori.adventure.nbt.CompoundBinaryTag;
-import net.kyori.adventure.nbt.ListBinaryTag;
-import net.kyori.adventure.nbt.TagStringIO;
-import ru.nanit.limbo.server.LimboServer;
-import ru.nanit.limbo.server.Logger;
-
-import java.io.*;
-import java.nio.charset.StandardCharsets;
-import java.util.stream.Collectors;
-
-public final class DimensionRegistry {
-
-    private final LimboServer server;
-
-    private Dimension defaultDimension;
-
-    private CompoundBinaryTag codec;
-    private CompoundBinaryTag oldCodec;
-
-    public DimensionRegistry(LimboServer server) {
-        this.server = server;
-    }
-
-    public CompoundBinaryTag getCodec() {
-        return codec;
-    }
-
-    public CompoundBinaryTag getOldCodec() {
-        return oldCodec;
-    }
-
-    public Dimension getDefaultDimension() {
-        return defaultDimension;
-    }
-
-    public void load(String def) throws IOException {
-        codec = readCodecFile("/dimension/codec_new.snbt");
-        // On 1.16-1.16.1 different codec format
-        oldCodec = readCodecFile("/dimension/codec_old.snbt");
-
-        ListBinaryTag dimensions = codec.getCompound("minecraft:dimension_type").getList("value");
-
-        CompoundBinaryTag overWorld = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(0)).get("element");
-        CompoundBinaryTag nether = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(2)).get("element");
-        CompoundBinaryTag theEnd = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(3)).get("element");
-
-        switch (def.toLowerCase()) {
-            case "overworld":
-                defaultDimension = new Dimension(0, "minecraft:overworld", overWorld);
-                break;
-            case "nether":
-                defaultDimension = new Dimension(-1, "minecraft:nether", nether);
-                break;
-            case "the_end":
-                defaultDimension = new Dimension(1, "minecraft:the_end", theEnd);
-                break;
-            default:
-                defaultDimension = new Dimension(1, "minecraft:the_end", theEnd);
-                Logger.warning("Undefined dimension type: '%s'. Using THE_END as default", def);
-                break;
-        }
-    }
-
-    private CompoundBinaryTag readCodecFile(String resPath) throws IOException {
-        InputStream in = server.getClass().getResourceAsStream(resPath);
-
-        if(in == null)
-            throw new FileNotFoundException("Cannot find dimension registry file");
-
-        return TagStringIO.get().asCompound(streamToString(in));
-    }
-
-    private String streamToString(InputStream in) throws IOException {
-        InputStreamReader isReader = new InputStreamReader(in, StandardCharsets.UTF_8);
-        BufferedReader bufReader = new BufferedReader(isReader);
-        String content = bufReader.lines()
-                .collect(Collectors.joining("\n"));
-
-        isReader.close();
-        bufReader.close();
-
-        return content;
-    }
-}

src/main/java/ua/nanit/limbo/LimboConstants.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo;
+package ua.nanit.limbo;
 
 public final class LimboConstants {
 

src/main/java/ua/nanit/limbo/NanoLimbo.java

@@ -15,10 +15,10 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo;
+package ua.nanit.limbo;
 
-import ru.nanit.limbo.server.LimboServer;
-import ru.nanit.limbo.server.Logger;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
 
 public final class NanoLimbo {
 
@@ -26,7 +26,7 @@ public final class NanoLimbo {
         try {
             new LimboServer().start();
         } catch (Exception e) {
-            Logger.error("Cannot start server: ", e);
+            Log.error("Cannot start server: ", e);
         }
     }
 

src/main/java/ua/nanit/limbo/configuration/LimboConfig.java

@@ -15,15 +15,17 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.configuration;
+package ua.nanit.limbo.configuration;
 
 import org.spongepowered.configurate.ConfigurationNode;
 import org.spongepowered.configurate.ConfigurationOptions;
 import org.spongepowered.configurate.serialize.TypeSerializerCollection;
 import org.spongepowered.configurate.yaml.YamlConfigurationLoader;
-import ru.nanit.limbo.server.data.*;
-import ru.nanit.limbo.util.Colors;
-import ru.nanit.limbo.world.Location;
+import ua.nanit.limbo.util.Colors;
+import ua.nanit.limbo.server.data.BossBar;
+import ua.nanit.limbo.server.data.InfoForwarding;
+import ua.nanit.limbo.server.data.PingData;
+import ua.nanit.limbo.server.data.Title;
 
 import java.io.BufferedReader;
 import java.io.FileNotFoundException;
@@ -43,7 +45,6 @@ public final class LimboConfig {
     private PingData pingData;
 
     private String dimensionType;
-    private Location spawnPosition;
     private int gameMode;
 
     private boolean useBrandName;
@@ -70,6 +71,11 @@ public final class LimboConfig {
     private int bossGroupSize;
     private int workerGroupSize;
 
+    private boolean useTrafficLimits;
+    private int maxPacketSize;
+    private double interval;
+    private double maxPacketRate;
+
     public LimboConfig(Path root) {
         this.root = root;
     }
@@ -86,8 +92,13 @@ public final class LimboConfig {
         address = conf.node("bind").get(SocketAddress.class);
         maxPlayers = conf.node("maxPlayers").getInt();
         pingData = conf.node("ping").get(PingData.class);
-        dimensionType = conf.node("dimension").getString();
-        spawnPosition = conf.node("spawnPosition").get(Location.class);
+        dimensionType = conf.node("dimension").getString("the_end");
+        if (dimensionType.equalsIgnoreCase("nether")) {
+            dimensionType = "the_nether";
+        }
+        if (dimensionType.equalsIgnoreCase("end")) {
+            dimensionType = "the_end";
+        }
         gameMode = conf.node("gameMode").getInt();
         useBrandName = conf.node("brandName", "enable").getBoolean();
         useJoinMessage = conf.node("joinMessage", "enable").getBoolean();
@@ -121,6 +132,11 @@ public final class LimboConfig {
         useEpoll = conf.node("netty", "useEpoll").getBoolean(true);
         bossGroupSize = conf.node("netty", "threads", "bossGroup").getInt(1);
         workerGroupSize = conf.node("netty", "threads", "workerGroup").getInt(4);
+
+        useTrafficLimits = conf.node("traffic", "enable").getBoolean(false);
+        maxPacketSize = conf.node("traffic", "maxPacketSize").getInt(-1);
+        interval = conf.node("traffic", "interval").getDouble(-1.0);
+        maxPacketRate = conf.node("traffic", "maxPacketRate").getDouble(-1.0);
     }
 
     private BufferedReader getReader() throws IOException {
@@ -146,7 +162,6 @@ public final class LimboConfig {
                 .register(PingData.class, new PingData.Serializer())
                 .register(BossBar.class, new BossBar.Serializer())
                 .register(Title.class, new Title.Serializer())
-                .register(Location.class, new Location.Serializer())
                 .build();
     }
 
@@ -166,10 +181,6 @@ public final class LimboConfig {
         return dimensionType;
     }
 
-    public Location getSpawnPosition() {
-        return spawnPosition;
-    }
-
     public int getGameMode() {
         return gameMode;
     }
@@ -249,4 +260,20 @@ public final class LimboConfig {
     public int getWorkerGroupSize() {
         return workerGroupSize;
     }
+
+    public boolean isUseTrafficLimits() {
+        return useTrafficLimits;
+    }
+
+    public int getMaxPacketSize() {
+        return maxPacketSize;
+    }
+
+    public double getInterval() {
+        return interval;
+    }
+
+    public double getMaxPacketRate() {
+        return maxPacketRate;
+    }
 }

src/main/java/ua/nanit/limbo/configuration/SocketAddressSerializer.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.configuration;
+package ua.nanit.limbo.configuration;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;

src/main/java/ua/nanit/limbo/connection/ClientChannelInitializer.java

@@ -15,17 +15,14 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection;
+package ua.nanit.limbo.connection;
 
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
 import io.netty.handler.timeout.ReadTimeoutHandler;
-import ru.nanit.limbo.connection.pipeline.PacketDecoder;
-import ru.nanit.limbo.connection.pipeline.PacketEncoder;
-import ru.nanit.limbo.connection.pipeline.VarIntFrameDecoder;
-import ru.nanit.limbo.connection.pipeline.VarIntLengthEncoder;
-import ru.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.connection.pipeline.*;
+import ua.nanit.limbo.server.LimboServer;
 
 import java.util.concurrent.TimeUnit;
 
@@ -43,14 +40,24 @@ public class ClientChannelInitializer extends ChannelInitializer<Channel> {
 
         PacketDecoder decoder = new PacketDecoder();
         PacketEncoder encoder = new PacketEncoder();
+        ClientConnection connection = new ClientConnection(channel, server, decoder, encoder);
 
         pipeline.addLast("timeout", new ReadTimeoutHandler(server.getConfig().getReadTimeout(),
                 TimeUnit.MILLISECONDS));
         pipeline.addLast("frame_decoder", new VarIntFrameDecoder());
         pipeline.addLast("frame_encoder", new VarIntLengthEncoder());
+
+        if (server.getConfig().isUseTrafficLimits()) {
+            pipeline.addLast("traffic_limit", new ChannelTrafficHandler(
+                    server.getConfig().getMaxPacketSize(),
+                    server.getConfig().getInterval(),
+                    server.getConfig().getMaxPacketRate()
+            ));
+        }
+
         pipeline.addLast("decoder", decoder);
         pipeline.addLast("encoder", encoder);
-        pipeline.addLast("handler", new ClientConnection(channel, server, decoder, encoder));
+        pipeline.addLast("handler", connection);
     }
 
 }

src/main/java/ua/nanit/limbo/connection/ClientConnection.java

@@ -0,0 +1,347 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ua.nanit.limbo.connection;
+
+import com.grack.nanojson.JsonArray;
+import com.grack.nanojson.JsonObject;
+import com.grack.nanojson.JsonParser;
+import com.grack.nanojson.JsonParserException;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import org.jetbrains.annotations.NotNull;
+import ua.nanit.limbo.connection.pipeline.PacketDecoder;
+import ua.nanit.limbo.connection.pipeline.PacketEncoder;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.PacketSnapshot;
+import ua.nanit.limbo.protocol.packets.login.PacketDisconnect;
+import ua.nanit.limbo.protocol.packets.play.PacketKeepAlive;
+import ua.nanit.limbo.protocol.registry.State;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
+import ua.nanit.limbo.util.UuidUtil;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.concurrent.TimeUnit;
+
+public class ClientConnection extends ChannelInboundHandlerAdapter {
+
+    private final LimboServer server;
+    private final Channel channel;
+    private final GameProfile gameProfile;
+
+    private final PacketDecoder decoder;
+    private final PacketEncoder encoder;
+
+    private State state;
+    private Version clientVersion;
+    private SocketAddress address;
+
+    private int velocityLoginMessageId = -1;
+
+    public ClientConnection(Channel channel, LimboServer server, PacketDecoder decoder, PacketEncoder encoder) {
+        this.server = server;
+        this.channel = channel;
+        this.decoder = decoder;
+        this.encoder = encoder;
+        this.address = channel.remoteAddress();
+        this.gameProfile = new GameProfile();
+    }
+
+    public UUID getUuid() {
+        return gameProfile.getUuid();
+    }
+
+    public String getUsername() {
+        return gameProfile.getUsername();
+    }
+
+    public SocketAddress getAddress() {
+        return address;
+    }
+
+    public Version getClientVersion() {
+        return clientVersion;
+    }
+
+    public GameProfile getGameProfile() {
+        return gameProfile;
+    }
+
+    @Override
+    public void channelInactive(@NotNull ChannelHandlerContext ctx) throws Exception {
+        if (state.equals(State.PLAY) || state.equals(State.CONFIGURATION)) {
+            server.getConnections().removeConnection(this);
+        }
+        super.channelInactive(ctx);
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+        if (channel.isActive()) {
+            Log.error("Unhandled exception: ", cause);
+        }
+    }
+
+    @Override
+    public void channelRead(@NotNull ChannelHandlerContext ctx, @NotNull Object msg) {
+        handlePacket(msg);
+    }
+
+    public void handlePacket(Object packet) {
+        if (packet instanceof Packet) {
+            ((Packet) packet).handle(this, server);
+        }
+    }
+
+    public void fireLoginSuccess() {
+        if (server.getConfig().getInfoForwarding().isModern() && velocityLoginMessageId == -1) {
+            disconnectLogin("You need to connect with Velocity");
+            return;
+        }
+
+        sendPacket(PacketSnapshots.PACKET_LOGIN_SUCCESS);
+
+        server.getConnections().addConnection(this);
+
+        // Preparing for configuration mode
+        if (clientVersion.moreOrEqual(Version.V1_20_2)) {
+            updateEncoderState(State.CONFIGURATION);
+            return;
+        }
+
+        spawnPlayer();
+    }
+
+    public void spawnPlayer() {
+        updateState(State.PLAY);
+
+        Runnable sendPlayPackets = () -> {
+            writePacket(PacketSnapshots.PACKET_JOIN_GAME);
+            writePacket(PacketSnapshots.PACKET_PLAYER_ABILITIES);
+
+            if (clientVersion.less(Version.V1_9)) {
+                writePacket(PacketSnapshots.PACKET_PLAYER_POS_AND_LOOK_LEGACY);
+            } else {
+                writePacket(PacketSnapshots.PACKET_PLAYER_POS_AND_LOOK);
+            }
+
+            if (clientVersion.moreOrEqual(Version.V1_19_3))
+                writePacket(PacketSnapshots.PACKET_SPAWN_POSITION);
+
+            if (server.getConfig().isUsePlayerList() || clientVersion.equals(Version.V1_16_4))
+                writePacket(PacketSnapshots.PACKET_PLAYER_INFO);
+
+            if (clientVersion.moreOrEqual(Version.V1_13)) {
+                writePacket(PacketSnapshots.PACKET_DECLARE_COMMANDS);
+
+                if (PacketSnapshots.PACKET_PLUGIN_MESSAGE != null)
+                    writePacket(PacketSnapshots.PACKET_PLUGIN_MESSAGE);
+            }
+
+            if (PacketSnapshots.PACKET_BOSS_BAR != null && clientVersion.moreOrEqual(Version.V1_9))
+                writePacket(PacketSnapshots.PACKET_BOSS_BAR);
+
+            if (PacketSnapshots.PACKET_JOIN_MESSAGE != null)
+                writePacket(PacketSnapshots.PACKET_JOIN_MESSAGE);
+
+            if (PacketSnapshots.PACKET_TITLE_TITLE != null && clientVersion.moreOrEqual(Version.V1_8))
+                writeTitle();
+
+            if (PacketSnapshots.PACKET_HEADER_AND_FOOTER != null && clientVersion.moreOrEqual(Version.V1_8))
+                writePacket(PacketSnapshots.PACKET_HEADER_AND_FOOTER);
+
+            if (clientVersion.moreOrEqual(Version.V1_20_3)) {
+                writePacket(PacketSnapshots.PACKET_START_WAITING_CHUNKS);
+
+                for (PacketSnapshot chunk : PacketSnapshots.PACKETS_EMPTY_CHUNKS) {
+                    writePacket(chunk);
+                }
+            }
+
+            sendKeepAlive();
+        };
+
+        if (clientVersion.lessOrEqual(Version.V1_7_6)) {
+            this.channel.eventLoop().schedule(sendPlayPackets, 100, TimeUnit.MILLISECONDS);
+        } else {
+            sendPlayPackets.run();
+        }
+    }
+
+    public void onLoginAcknowledgedReceived() {
+        updateState(State.CONFIGURATION);
+
+        if (PacketSnapshots.PACKET_PLUGIN_MESSAGE != null)
+            writePacket(PacketSnapshots.PACKET_PLUGIN_MESSAGE);
+
+        if (clientVersion.moreOrEqual(Version.V1_20_5)) {
+            for (PacketSnapshot packet : PacketSnapshots.PACKETS_REGISTRY_DATA) {
+                writePacket(packet);
+            }
+        } else {
+            writePacket(PacketSnapshots.PACKET_REGISTRY_DATA);
+        }
+
+        sendPacket(PacketSnapshots.PACKET_FINISH_CONFIGURATION);
+    }
+
+    public void disconnectLogin(String reason) {
+        if (isConnected() && state == State.LOGIN) {
+            PacketDisconnect disconnect = new PacketDisconnect();
+            disconnect.setReason(reason);
+            sendPacketAndClose(disconnect);
+        }
+    }
+
+    public void writeTitle() {
+        if (clientVersion.moreOrEqual(Version.V1_17)) {
+            writePacket(PacketSnapshots.PACKET_TITLE_TITLE);
+            writePacket(PacketSnapshots.PACKET_TITLE_SUBTITLE);
+            writePacket(PacketSnapshots.PACKET_TITLE_TIMES);
+        } else {
+            writePacket(PacketSnapshots.PACKET_TITLE_LEGACY_TITLE);
+            writePacket(PacketSnapshots.PACKET_TITLE_LEGACY_SUBTITLE);
+            writePacket(PacketSnapshots.PACKET_TITLE_LEGACY_TIMES);
+        }
+    }
+
+    public void sendKeepAlive() {
+        if (state.equals(State.PLAY)) {
+            PacketKeepAlive keepAlive = new PacketKeepAlive();
+            keepAlive.setId(ThreadLocalRandom.current().nextLong());
+            sendPacket(keepAlive);
+        }
+    }
+
+    public void sendPacket(Object packet) {
+        if (isConnected())
+            channel.writeAndFlush(packet, channel.voidPromise());
+    }
+
+    public void sendPacketAndClose(Object packet) {
+        if (isConnected())
+            channel.writeAndFlush(packet).addListener(ChannelFutureListener.CLOSE);
+    }
+
+    public void writePacket(Object packet) {
+        if (isConnected())
+            channel.write(packet, channel.voidPromise());
+    }
+
+    public boolean isConnected() {
+        return channel.isActive();
+    }
+
+    public void updateState(State state) {
+        this.state = state;
+        decoder.updateState(state);
+        encoder.updateState(state);
+    }
+
+    public void updateEncoderState(State state) {
+        encoder.updateState(state);
+    }
+
+    public void updateVersion(Version version) {
+        clientVersion = version;
+        decoder.updateVersion(version);
+        encoder.updateVersion(version);
+    }
+
+    public void setAddress(String host) {
+        this.address = new InetSocketAddress(host, ((InetSocketAddress) this.address).getPort());
+    }
+
+    boolean checkBungeeGuardHandshake(String handshake) {
+        String[] split = handshake.split("\00");
+
+        if (split.length != 4)
+            return false;
+
+        String socketAddressHostname = split[1];
+        UUID uuid = UuidUtil.fromString(split[2]);
+        JsonArray arr;
+
+        try {
+            arr = JsonParser.array().from(split[3]);
+        } catch (JsonParserException e) {
+            return false;
+        }
+
+        String token = null;
+
+        for (Object obj : arr) {
+            if (obj instanceof JsonObject) {
+                JsonObject prop = (JsonObject) obj;
+                if (prop.getString("name").equals("bungeeguard-token")) {
+                    token = prop.getString("value");
+                    break;
+                }
+            }
+        }
+
+        if (!server.getConfig().getInfoForwarding().hasToken(token))
+            return false;
+
+        setAddress(socketAddressHostname);
+        gameProfile.setUuid(uuid);
+
+        Log.debug("Successfully verified BungeeGuard token");
+
+        return true;
+    }
+
+    int getVelocityLoginMessageId() {
+        return velocityLoginMessageId;
+    }
+
+    void setVelocityLoginMessageId(int velocityLoginMessageId) {
+        this.velocityLoginMessageId = velocityLoginMessageId;
+    }
+
+    boolean checkVelocityKeyIntegrity(ByteMessage buf) {
+        byte[] signature = new byte[32];
+        buf.readBytes(signature);
+        byte[] data = new byte[buf.readableBytes()];
+        buf.getBytes(buf.readerIndex(), data);
+        try {
+            Mac mac = Mac.getInstance("HmacSHA256");
+            mac.init(new SecretKeySpec(server.getConfig().getInfoForwarding().getSecretKey(), "HmacSHA256"));
+            byte[] mySignature = mac.doFinal(data);
+            if (!MessageDigest.isEqual(signature, mySignature))
+                return false;
+        } catch (InvalidKeyException | java.security.NoSuchAlgorithmException e) {
+            throw new AssertionError(e);
+        }
+        int version = buf.readVarInt();
+        if (version != 1)
+            throw new IllegalStateException("Unsupported forwarding version " + version + ", wanted " + '\001');
+        return true;
+    }
+}

src/main/java/ua/nanit/limbo/connection/GameProfile.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection;
+package ua.nanit.limbo.connection;
 
 import java.util.UUID;
 

src/main/java/ua/nanit/limbo/connection/PacketHandler.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ua.nanit.limbo.connection;
+
+import io.netty.buffer.Unpooled;
+import ua.nanit.limbo.LimboConstants;
+import ua.nanit.limbo.protocol.packets.PacketHandshake;
+import ua.nanit.limbo.protocol.packets.configuration.PacketFinishConfiguration;
+import ua.nanit.limbo.protocol.packets.login.PacketLoginAcknowledged;
+import ua.nanit.limbo.protocol.packets.login.PacketLoginPluginRequest;
+import ua.nanit.limbo.protocol.packets.login.PacketLoginPluginResponse;
+import ua.nanit.limbo.protocol.packets.login.PacketLoginStart;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusPing;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusRequest;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusResponse;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
+import ua.nanit.limbo.util.UuidUtil;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+public class PacketHandler {
+
+    private final LimboServer server;
+
+    public PacketHandler(LimboServer server) {
+        this.server = server;
+    }
+
+    public void handle(ClientConnection conn, PacketHandshake packet) {
+        conn.updateVersion(packet.getVersion());
+        conn.updateState(packet.getNextState());
+
+        Log.debug("Pinged from %s [%s]", conn.getAddress(),
+                conn.getClientVersion().toString());
+
+        if (server.getConfig().getInfoForwarding().isLegacy()) {
+            String[] split = packet.getHost().split("\00");
+
+            if (split.length == 3 || split.length == 4) {
+                conn.setAddress(split[1]);
+                conn.getGameProfile().setUuid(UuidUtil.fromString(split[2]));
+            } else {
+                conn.disconnectLogin("You've enabled player info forwarding. You need to connect with proxy");
+            }
+        } else if (server.getConfig().getInfoForwarding().isBungeeGuard()) {
+            if (!conn.checkBungeeGuardHandshake(packet.getHost())) {
+                conn.disconnectLogin("Invalid BungeeGuard token or handshake format");
+            }
+        }
+    }
+
+    public void handle(ClientConnection conn, PacketStatusRequest packet) {
+        conn.sendPacket(new PacketStatusResponse(server));
+    }
+
+    public void handle(ClientConnection conn, PacketStatusPing packet) {
+        conn.sendPacketAndClose(packet);
+    }
+
+    public void handle(ClientConnection conn, PacketLoginStart packet) {
+        if (server.getConfig().getMaxPlayers() > 0 &&
+                server.getConnections().getCount() >= server.getConfig().getMaxPlayers()) {
+            conn.disconnectLogin("Too many players connected");
+            return;
+        }
+
+        if (!conn.getClientVersion().isSupported()) {
+            conn.disconnectLogin("Unsupported client version");
+            return;
+        }
+
+        if (server.getConfig().getInfoForwarding().isModern()) {
+            int loginId = ThreadLocalRandom.current().nextInt(0, Integer.MAX_VALUE);
+            PacketLoginPluginRequest request = new PacketLoginPluginRequest();
+
+            request.setMessageId(loginId);
+            request.setChannel(LimboConstants.VELOCITY_INFO_CHANNEL);
+            request.setData(Unpooled.EMPTY_BUFFER);
+
+            conn.setVelocityLoginMessageId(loginId);
+            conn.sendPacket(request);
+            return;
+        }
+
+        if (!server.getConfig().getInfoForwarding().isModern()) {
+            conn.getGameProfile().setUsername(packet.getUsername());
+            conn.getGameProfile().setUuid(UuidUtil.getOfflineModeUuid(packet.getUsername()));
+        }
+
+        conn.fireLoginSuccess();
+    }
+
+    public void handle(ClientConnection conn, PacketLoginPluginResponse packet) {
+        if (server.getConfig().getInfoForwarding().isModern()
+                && packet.getMessageId() == conn.getVelocityLoginMessageId()) {
+
+            if (!packet.isSuccessful() || packet.getData() == null) {
+                conn.disconnectLogin("You need to connect with Velocity");
+                return;
+            }
+
+            if (!conn.checkVelocityKeyIntegrity(packet.getData())) {
+                conn.disconnectLogin("Can't verify forwarded player info");
+                return;
+            }
+
+            // Order is important
+            conn.setAddress(packet.getData().readString());
+            conn.getGameProfile().setUuid(packet.getData().readUuid());
+            conn.getGameProfile().setUsername(packet.getData().readString());
+
+            conn.fireLoginSuccess();
+        }
+    }
+
+    public void handle(ClientConnection conn, PacketLoginAcknowledged packet) {
+        conn.onLoginAcknowledgedReceived();
+    }
+
+    public void handle(ClientConnection conn, PacketFinishConfiguration packet) {
+        conn.spawnPlayer();
+    }
+
+}

src/main/java/ua/nanit/limbo/connection/PacketSnapshots.java

@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ua.nanit.limbo.connection;
+
+import net.kyori.adventure.nbt.BinaryTag;
+import net.kyori.adventure.nbt.CompoundBinaryTag;
+import net.kyori.adventure.nbt.ListBinaryTag;
+import ua.nanit.limbo.LimboConstants;
+import ua.nanit.limbo.protocol.PacketSnapshot;
+import ua.nanit.limbo.protocol.packets.configuration.PacketFinishConfiguration;
+import ua.nanit.limbo.protocol.packets.configuration.PacketRegistryData;
+import ua.nanit.limbo.protocol.packets.login.PacketLoginSuccess;
+import ua.nanit.limbo.protocol.packets.play.*;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.data.Title;
+import ua.nanit.limbo.util.NbtMessageUtil;
+import ua.nanit.limbo.util.UuidUtil;
+import ua.nanit.limbo.world.Dimension;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+
+public final class PacketSnapshots {
+
+    public static PacketSnapshot PACKET_LOGIN_SUCCESS;
+    public static PacketSnapshot PACKET_JOIN_GAME;
+    public static PacketSnapshot PACKET_SPAWN_POSITION;
+    public static PacketSnapshot PACKET_PLUGIN_MESSAGE;
+    public static PacketSnapshot PACKET_PLAYER_ABILITIES;
+    public static PacketSnapshot PACKET_PLAYER_INFO;
+    public static PacketSnapshot PACKET_DECLARE_COMMANDS;
+    public static PacketSnapshot PACKET_JOIN_MESSAGE;
+    public static PacketSnapshot PACKET_BOSS_BAR;
+    public static PacketSnapshot PACKET_HEADER_AND_FOOTER;
+
+    public static PacketSnapshot PACKET_PLAYER_POS_AND_LOOK_LEGACY;
+    // For 1.19 we need to spawn player outside the world to avoid stuck in terrain loading
+    public static PacketSnapshot PACKET_PLAYER_POS_AND_LOOK;
+
+    public static PacketSnapshot PACKET_TITLE_TITLE;
+    public static PacketSnapshot PACKET_TITLE_SUBTITLE;
+    public static PacketSnapshot PACKET_TITLE_TIMES;
+
+    public static PacketSnapshot PACKET_TITLE_LEGACY_TITLE;
+    public static PacketSnapshot PACKET_TITLE_LEGACY_SUBTITLE;
+    public static PacketSnapshot PACKET_TITLE_LEGACY_TIMES;
+
+    public static PacketSnapshot PACKET_REGISTRY_DATA;
+    public static List<PacketSnapshot> PACKETS_REGISTRY_DATA;
+    public static PacketSnapshot PACKET_FINISH_CONFIGURATION;
+
+    public static List<PacketSnapshot> PACKETS_EMPTY_CHUNKS;
+    public static PacketSnapshot PACKET_START_WAITING_CHUNKS;
+
+    private PacketSnapshots() { }
+
+    public static void initPackets(LimboServer server) {
+        final String username = server.getConfig().getPingData().getVersion();
+        final UUID uuid = UuidUtil.getOfflineModeUuid(username);
+
+        PacketLoginSuccess loginSuccess = new PacketLoginSuccess();
+        loginSuccess.setUsername(username);
+        loginSuccess.setUuid(uuid);
+
+        PacketJoinGame joinGame = new PacketJoinGame();
+        String worldName = "minecraft:" + server.getConfig().getDimensionType().toLowerCase();
+        joinGame.setEntityId(0);
+        joinGame.setEnableRespawnScreen(true);
+        joinGame.setFlat(false);
+        joinGame.setGameMode(server.getConfig().getGameMode());
+        joinGame.setHardcore(false);
+        joinGame.setMaxPlayers(server.getConfig().getMaxPlayers());
+        joinGame.setPreviousGameMode(-1);
+        joinGame.setReducedDebugInfo(true);
+        joinGame.setDebug(false);
+        joinGame.setViewDistance(0);
+        joinGame.setWorldName(worldName);
+        joinGame.setWorldNames(worldName);
+        joinGame.setHashedSeed(0);
+        joinGame.setDimensionRegistry(server.getDimensionRegistry());
+
+        PacketPlayerAbilities playerAbilities = new PacketPlayerAbilities();
+        playerAbilities.setFlyingSpeed(0.0F);
+        playerAbilities.setFlags(0x02);
+        playerAbilities.setFieldOfView(0.1F);
+
+        int teleportId = ThreadLocalRandom.current().nextInt();
+
+        PacketPlayerPositionAndLook positionAndLookLegacy
+                = new PacketPlayerPositionAndLook(0, 64, 0, 0, 0, teleportId);
+
+        PacketPlayerPositionAndLook positionAndLook
+                = new PacketPlayerPositionAndLook(0, 400, 0, 0, 0, teleportId);
+
+        PacketSpawnPosition packetSpawnPosition = new PacketSpawnPosition(0, 400, 0);
+
+        PacketDeclareCommands declareCommands = new PacketDeclareCommands();
+        declareCommands.setCommands(Collections.emptyList());
+
+        PacketPlayerInfo info = new PacketPlayerInfo();
+        info.setUsername(server.getConfig().getPlayerListUsername());
+        info.setGameMode(server.getConfig().getGameMode());
+        info.setUuid(uuid);
+
+        PACKET_LOGIN_SUCCESS = PacketSnapshot.of(loginSuccess);
+        PACKET_JOIN_GAME = PacketSnapshot.of(joinGame);
+        PACKET_PLAYER_POS_AND_LOOK_LEGACY = PacketSnapshot.of(positionAndLookLegacy);
+        PACKET_PLAYER_POS_AND_LOOK = PacketSnapshot.of(positionAndLook);
+        PACKET_SPAWN_POSITION = PacketSnapshot.of(packetSpawnPosition);
+        PACKET_PLAYER_ABILITIES = PacketSnapshot.of(playerAbilities);
+        PACKET_PLAYER_INFO = PacketSnapshot.of(info);
+
+        PACKET_DECLARE_COMMANDS = PacketSnapshot.of(declareCommands);
+
+        if (server.getConfig().isUseHeaderAndFooter()) {
+            PacketPlayerListHeader header = new PacketPlayerListHeader();
+            header.setHeader(NbtMessageUtil.create(server.getConfig().getPlayerListHeader()));
+            header.setFooter(NbtMessageUtil.create(server.getConfig().getPlayerListFooter()));
+            PACKET_HEADER_AND_FOOTER = PacketSnapshot.of(header);
+        }
+
+        if (server.getConfig().isUseBrandName()){
+            PacketPluginMessage pluginMessage = new PacketPluginMessage();
+            pluginMessage.setChannel(LimboConstants.BRAND_CHANNEL);
+            pluginMessage.setMessage(server.getConfig().getBrandName());
+            PACKET_PLUGIN_MESSAGE = PacketSnapshot.of(pluginMessage);
+        }
+
+        if (server.getConfig().isUseJoinMessage()) {
+            PacketChatMessage joinMessage = new PacketChatMessage();
+            joinMessage.setMessage(NbtMessageUtil.create(server.getConfig().getJoinMessage()));
+            joinMessage.setPosition(PacketChatMessage.PositionLegacy.SYSTEM_MESSAGE);
+            joinMessage.setSender(UUID.randomUUID());
+            PACKET_JOIN_MESSAGE = PacketSnapshot.of(joinMessage);
+        }
+
+        if (server.getConfig().isUseBossBar()) {
+            PacketBossBar bossBar = new PacketBossBar();
+            bossBar.setBossBar(server.getConfig().getBossBar());
+            bossBar.setUuid(UUID.randomUUID());
+            PACKET_BOSS_BAR = PacketSnapshot.of(bossBar);
+        }
+
+        if (server.getConfig().isUseTitle()) {
+            Title title = server.getConfig().getTitle();
+
+            PacketTitleSetTitle packetTitle = new PacketTitleSetTitle();
+            PacketTitleSetSubTitle packetSubtitle = new PacketTitleSetSubTitle();
+            PacketTitleTimes packetTimes = new PacketTitleTimes();
+
+            PacketTitleLegacy legacyTitle = new PacketTitleLegacy();
+            PacketTitleLegacy legacySubtitle = new PacketTitleLegacy();
+            PacketTitleLegacy legacyTimes = new PacketTitleLegacy();
+
+            packetTitle.setTitle(title.getTitle());
+            packetSubtitle.setSubtitle(title.getSubtitle());
+            packetTimes.setFadeIn(title.getFadeIn());
+            packetTimes.setStay(title.getStay());
+            packetTimes.setFadeOut(title.getFadeOut());
+
+            legacyTitle.setTitle(title);
+            legacyTitle.setAction(PacketTitleLegacy.Action.SET_TITLE);
+
+            legacySubtitle.setTitle(title);
+            legacySubtitle.setAction(PacketTitleLegacy.Action.SET_SUBTITLE);
+
+            legacyTimes.setTitle(title);
+            legacyTimes.setAction(PacketTitleLegacy.Action.SET_TIMES_AND_DISPLAY);
+
+            PACKET_TITLE_TITLE = PacketSnapshot.of(packetTitle);
+            PACKET_TITLE_SUBTITLE = PacketSnapshot.of(packetSubtitle);
+            PACKET_TITLE_TIMES = PacketSnapshot.of(packetTimes);
+
+            PACKET_TITLE_LEGACY_TITLE = PacketSnapshot.of(legacyTitle);
+            PACKET_TITLE_LEGACY_SUBTITLE = PacketSnapshot.of(legacySubtitle);
+            PACKET_TITLE_LEGACY_TIMES = PacketSnapshot.of(legacyTimes);
+        }
+
+        PacketRegistryData packetRegistryData = new PacketRegistryData();
+        packetRegistryData.setDimensionRegistry(server.getDimensionRegistry());
+
+        PACKET_REGISTRY_DATA = PacketSnapshot.of(packetRegistryData);
+
+        Dimension dimension1_21 = server.getDimensionRegistry().getDimension_1_21();
+        List<PacketSnapshot> packetRegistries = new ArrayList<>();
+        CompoundBinaryTag dimensionTag = dimension1_21.getData();
+        for (String registryType : dimensionTag.keySet()) {
+            CompoundBinaryTag compoundRegistryType = dimensionTag.getCompound(registryType);
+
+            PacketRegistryData registryData = new PacketRegistryData();
+            registryData.setDimensionRegistry(server.getDimensionRegistry());
+
+            ListBinaryTag values = compoundRegistryType.getList("value");
+            registryData.setMetadataWriter((message, version) -> {
+                message.writeString(registryType);
+
+                message.writeVarInt(values.size());
+                for (BinaryTag entry : values) {
+                    CompoundBinaryTag entryTag = (CompoundBinaryTag) entry;
+
+                    String name = entryTag.getString("name");
+                    CompoundBinaryTag element = entryTag.getCompound("element");
+
+                    message.writeString(name);
+                    message.writeBoolean(true);
+                    message.writeNamelessCompoundTag(element);
+                }
+            });
+
+            packetRegistries.add(PacketSnapshot.of(registryData));
+        }
+
+        PACKETS_REGISTRY_DATA = packetRegistries;
+
+        PACKET_FINISH_CONFIGURATION = PacketSnapshot.of(new PacketFinishConfiguration());
+
+        PacketGameEvent packetGameEvent = new PacketGameEvent();
+        packetGameEvent.setType((byte) 13); // Waiting for chunks type
+        packetGameEvent.setValue(0);
+        PACKET_START_WAITING_CHUNKS = PacketSnapshot.of(packetGameEvent);
+
+        int chunkXOffset = (int) 0 >> 4; // Default x position is 0
+        int chunkZOffset = (int) 0 >> 4; // Default z position is 0
+        int chunkEdgeSize = 1; // TODO Make configurable?
+
+        List<PacketSnapshot> emptyChunks = new ArrayList<>();
+        // Make multiple chunks for edges
+        for (int chunkX = chunkXOffset - chunkEdgeSize; chunkX <= chunkXOffset + chunkEdgeSize; ++chunkX) {
+            for (int chunkZ = chunkZOffset - chunkEdgeSize; chunkZ <= chunkZOffset + chunkEdgeSize; ++chunkZ) {
+                PacketEmptyChunk packetEmptyChunk = new PacketEmptyChunk();
+                packetEmptyChunk.setX(chunkX);
+                packetEmptyChunk.setZ(chunkZ);
+
+                emptyChunks.add(PacketSnapshot.of(packetEmptyChunk));
+            }
+        }
+        PACKETS_EMPTY_CHUNKS = emptyChunks;
+    }
+}

src/main/java/ua/nanit/limbo/connection/pipeline/ChannelTrafficHandler.java

@@ -0,0 +1,111 @@
+package ua.nanit.limbo.connection.pipeline;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import org.jetbrains.annotations.NotNull;
+import ua.nanit.limbo.server.Log;
+
+import java.util.Arrays;
+
+public class ChannelTrafficHandler extends ChannelInboundHandlerAdapter {
+
+    private final int maxPacketSize;
+    private final double maxPacketRate;
+    private final PacketBucket packetBucket;
+
+    public ChannelTrafficHandler(int maxPacketSize, double interval, double maxPacketRate) {
+        this.maxPacketSize = maxPacketSize;
+        this.maxPacketRate = maxPacketRate;
+        this.packetBucket = (interval > 0.0 && maxPacketRate > 0.0) ? new PacketBucket(interval * 1000.0, 150) : null;
+    }
+
+    @Override
+    public void channelRead(@NotNull ChannelHandlerContext ctx, @NotNull Object msg) throws Exception {
+        if (msg instanceof ByteBuf) {
+            ByteBuf in = (ByteBuf) msg;
+            int bytes = in.readableBytes();
+
+            if (maxPacketSize > 0 && bytes > maxPacketSize) {
+                closeConnection(ctx, "Closed %s due to large packet size (%d bytes)", ctx.channel().remoteAddress(), bytes);
+                return;
+            }
+
+            if (packetBucket != null) {
+                packetBucket.incrementPackets(1);
+                if (packetBucket.getCurrentPacketRate() > maxPacketRate) {
+                    closeConnection(ctx, "Closed %s due to many packets sent (%d in the last %.1f seconds)", ctx.channel().remoteAddress(), packetBucket.sum, (packetBucket.intervalTime / 1000.0));
+                    return;
+                }
+            }
+        }
+
+        super.channelRead(ctx, msg);
+    }
+
+    private void closeConnection(ChannelHandlerContext ctx, String reason, Object... args) {
+        ctx.close();
+        Log.info(reason, args);
+    }
+
+    private static class PacketBucket {
+        private static final double NANOSECONDS_TO_MILLISECONDS = 1.0e-6;
+        private static final int MILLISECONDS_TO_SECONDS = 1000;
+
+        private final double intervalTime;
+        private final double intervalResolution;
+        private final int[] data;
+        private int newestData;
+        private double lastBucketTime;
+        private int sum;
+
+        public PacketBucket(final double intervalTime, final int totalBuckets) {
+            this.intervalTime = intervalTime;
+            this.intervalResolution = intervalTime / totalBuckets;
+            this.data = new int[totalBuckets];
+        }
+
+        public void incrementPackets(final int packets) {
+            double timeMs = System.nanoTime() * NANOSECONDS_TO_MILLISECONDS;
+            double timeDelta = timeMs - this.lastBucketTime;
+
+            if (timeDelta < 0.0) {
+                timeDelta = 0.0;
+            }
+
+            if (timeDelta < this.intervalResolution) {
+                this.data[this.newestData] += packets;
+                this.sum += packets;
+                return;
+            }
+
+            int bucketsToMove = (int)(timeDelta / this.intervalResolution);
+            double nextBucketTime = this.lastBucketTime + bucketsToMove * this.intervalResolution;
+
+            if (bucketsToMove >= this.data.length) {
+                Arrays.fill(this.data, 0);
+                this.data[0] = packets;
+                this.sum = packets;
+                this.newestData = 0;
+                this.lastBucketTime = timeMs;
+                return;
+            }
+
+            for (int i = 1; i < bucketsToMove; ++i) {
+                int index = (this.newestData + i) % this.data.length;
+                this.sum -= this.data[index];
+                this.data[index] = 0;
+            }
+
+            int newestDataIndex = (this.newestData + bucketsToMove) % this.data.length;
+            this.sum += packets - this.data[newestDataIndex];
+            this.data[newestDataIndex] = packets;
+            this.newestData = newestDataIndex;
+            this.lastBucketTime = nextBucketTime;
+        }
+
+        public double getCurrentPacketRate() {
+            return this.sum / (this.intervalTime / MILLISECONDS_TO_SECONDS);
+        }
+    }
+}

src/main/java/ua/nanit/limbo/connection/pipeline/PacketDecoder.java

@@ -15,16 +15,16 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection.pipeline;
+package ua.nanit.limbo.connection.pipeline;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToMessageDecoder;
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.Packet;
-import ru.nanit.limbo.protocol.registry.State;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.Logger;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.registry.State;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.Log;
 
 import java.util.List;
 
@@ -47,16 +47,20 @@ public class PacketDecoder extends MessageToMessageDecoder<ByteBuf> {
         Packet packet = mappings.getPacket(packetId);
 
         if (packet != null) {
-            Logger.debug("Received packet %s", packet.toString());
+            Log.debug("Received packet %s[0x%s] (%d bytes)", packet.toString(), Integer.toHexString(packetId), msg.readableBytes());
             try {
                 packet.decode(msg, version);
             } catch (Exception e) {
-                Logger.warning("Cannot decode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage());
+                if (Log.isDebug()) {
+                    Log.warning("Cannot decode packet 0x%s", e, Integer.toHexString(packetId));
+                } else {
+                    Log.warning("Cannot decode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage());
+                }
             }
 
             ctx.fireChannelRead(packet);
         } else {
-            Logger.debug("Undefined incoming packet: 0x" + Integer.toHexString(packetId));
+            Log.debug("Undefined incoming packet: 0x" + Integer.toHexString(packetId));
         }
     }
 

src/main/java/ua/nanit/limbo/connection/pipeline/PacketEncoder.java

@@ -15,17 +15,17 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection.pipeline;
+package ua.nanit.limbo.connection.pipeline;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToByteEncoder;
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.Packet;
-import ru.nanit.limbo.protocol.PacketSnapshot;
-import ru.nanit.limbo.protocol.registry.State;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.Logger;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.PacketSnapshot;
+import ua.nanit.limbo.protocol.registry.State;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.Log;
 
 public class PacketEncoder extends MessageToByteEncoder<Packet> {
 
@@ -51,7 +51,7 @@ public class PacketEncoder extends MessageToByteEncoder<Packet> {
         }
 
         if (packetId == -1) {
-            Logger.warning("Undefined packet class: %s", packet.getClass().getName());
+            Log.warning("Undefined packet class: %s[0x%s] (%d bytes)", packet.getClass().getName(), Integer.toHexString(packetId), msg.readableBytes());
             return;
         }
 
@@ -60,11 +60,11 @@ public class PacketEncoder extends MessageToByteEncoder<Packet> {
         try {
             packet.encode(msg, version);
 
-            if (Logger.getLevel() >= 3) {
-                Logger.debug("Sending %s packet (%d bytes)", packet.toString(), msg.readableBytes());
+            if (Log.isDebug()) {
+                Log.debug("Sending %s[0x%s] packet (%d bytes)", packet.toString(), Integer.toHexString(packetId), msg.readableBytes());
             }
         } catch (Exception e) {
-            Logger.error("Cannot encode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage());
+            Log.error("Cannot encode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage());
         }
     }
 

src/main/java/ua/nanit/limbo/connection/pipeline/VarIntByteDecoder.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection.pipeline;
+package ua.nanit.limbo.connection.pipeline;
 
 import io.netty.util.ByteProcessor;
 

src/main/java/ua/nanit/limbo/connection/pipeline/VarIntFrameDecoder.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection.pipeline;
+package ua.nanit.limbo.connection.pipeline;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
-import ru.nanit.limbo.server.Logger;
+import ua.nanit.limbo.server.Log;
 
 import java.util.List;
 
@@ -42,18 +42,19 @@ public class VarIntFrameDecoder extends ByteToMessageDecoder {
             int readVarInt = reader.getReadVarInt();
             int bytesRead = reader.getBytesRead();
             if (readVarInt < 0) {
-                Logger.error("[VarIntFrameDecoder] Bad data length");
+                Log.error("[VarIntFrameDecoder] Bad data length");
             } else if (readVarInt == 0) {
                 in.readerIndex(varIntEnd + 1);
             } else {
                 int minimumRead = bytesRead + readVarInt;
+
                 if (in.isReadable(minimumRead)) {
                     out.add(in.retainedSlice(varIntEnd + 1, readVarInt));
                     in.skipBytes(minimumRead);
                 }
             }
         } else if (reader.getResult() == VarIntByteDecoder.DecodeResult.TOO_BIG) {
-            Logger.error("[VarIntFrameDecoder] Too big data");
+            Log.error("[VarIntFrameDecoder] Too big data");
         }
     }
 }

src/main/java/ua/nanit/limbo/connection/pipeline/VarIntLengthEncoder.java

@@ -15,13 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.connection.pipeline;
+package ua.nanit.limbo.connection.pipeline;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToByteEncoder;
-import ru.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.ByteMessage;
 
 @ChannelHandler.Sharable
 public class VarIntLengthEncoder extends MessageToByteEncoder<ByteBuf> {

src/main/java/ua/nanit/limbo/protocol/ByteMessage.java

@@ -15,14 +15,14 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol;
+package ua.nanit.limbo.protocol;
 
 import io.netty.buffer.*;
 import io.netty.handler.codec.DecoderException;
 import io.netty.handler.codec.EncoderException;
 import io.netty.util.ByteProcessor;
-import net.kyori.adventure.nbt.BinaryTagIO;
-import net.kyori.adventure.nbt.CompoundBinaryTag;
+import net.kyori.adventure.nbt.*;
+import ua.nanit.limbo.protocol.registry.Version;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -34,6 +34,9 @@ import java.nio.channels.GatheringByteChannel;
 import java.nio.channels.ScatteringByteChannel;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.BitSet;
+import java.util.EnumSet;
 import java.util.UUID;
 
 public class ByteMessage extends ByteBuf {
@@ -70,14 +73,37 @@ public class ByteMessage extends ByteBuf {
     }
 
     public void writeVarInt(int value) {
-        while (true) {
-            if ((value & 0xFFFFFF80) == 0) {
+        // Peel the one and two byte count cases explicitly as they are the most common VarInt sizes
+        // that the proxy will write, to improve inlining.
+        if ((value & (0xFFFFFFFF << 7)) == 0) {
             buf.writeByte(value);
-                return;
+        } else if ((value & (0xFFFFFFFF << 14)) == 0) {
+            int w = (value & 0x7F | 0x80) << 8 | (value >>> 7);
+            buf.writeShort(w);
+        } else {
+            writeVarIntFull(value);
+        }
     }
 
-            buf.writeByte(value & 0x7F | 0x80);
-            value >>>= 7;
+    private void writeVarIntFull(final int value) {
+        // See https://steinborn.me/posts/performance/how-fast-can-you-write-a-varint/
+        if ((value & (0xFFFFFFFF << 7)) == 0) {
+            buf.writeByte(value);
+        } else if ((value & (0xFFFFFFFF << 14)) == 0) {
+            int w = (value & 0x7F | 0x80) << 8 | (value >>> 7);
+            buf.writeShort(w);
+        } else if ((value & (0xFFFFFFFF << 21)) == 0) {
+            int w = (value & 0x7F | 0x80) << 16 | ((value >>> 7) & 0x7F | 0x80) << 8 | (value >>> 14);
+            buf.writeMedium(w);
+        } else if ((value & (0xFFFFFFFF << 28)) == 0) {
+            int w = (value & 0x7F | 0x80) << 24 | (((value >>> 7) & 0x7F | 0x80) << 16)
+                    | ((value >>> 14) & 0x7F | 0x80) << 8 | (value >>> 21);
+            buf.writeInt(w);
+        } else {
+            int w = (value & 0x7F | 0x80) << 24 | ((value >>> 7) & 0x7F | 0x80) << 16
+                    | ((value >>> 14) & 0x7F | 0x80) << 8 | ((value >>> 21) & 0x7F | 0x80);
+            buf.writeInt(w);
+            buf.writeByte(value >>> 28);
         }
     }
 
@@ -166,7 +192,8 @@ public class ByteMessage extends ByteBuf {
             for (CompoundBinaryTag tag : compoundTags) {
                 BinaryTagIO.writer().write(tag, (OutputStream) stream);
             }
-        } catch (IOException e) {
+        }
+        catch (IOException e) {
             throw new EncoderException("Cannot write NBT CompoundTag");
         }
     }
@@ -174,7 +201,8 @@ public class ByteMessage extends ByteBuf {
     public CompoundBinaryTag readCompoundTag() {
         try (ByteBufInputStream stream = new ByteBufInputStream(buf)) {
             return BinaryTagIO.reader().read((InputStream) stream);
-        } catch (IOException thrown) {
+        }
+        catch (IOException thrown) {
             throw new DecoderException("Cannot read NBT CompoundTag");
         }
     }
@@ -182,11 +210,87 @@ public class ByteMessage extends ByteBuf {
     public void writeCompoundTag(CompoundBinaryTag compoundTag) {
         try (ByteBufOutputStream stream = new ByteBufOutputStream(buf)) {
             BinaryTagIO.writer().write(compoundTag, (OutputStream) stream);
-        } catch (IOException e) {
+        }
+        catch (IOException e) {
             throw new EncoderException("Cannot write NBT CompoundTag");
         }
     }
 
+    public void writeNamelessCompoundTag(BinaryTag binaryTag) {
+        try (ByteBufOutputStream stream = new ByteBufOutputStream(buf)) {
+            stream.writeByte(binaryTag.type().id());
+
+            // TODO Find a way to improve this...
+            if (binaryTag instanceof CompoundBinaryTag) {
+                CompoundBinaryTag tag = (CompoundBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof ByteBinaryTag) {
+                ByteBinaryTag tag = (ByteBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof ShortBinaryTag) {
+                ShortBinaryTag tag = (ShortBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else  if (binaryTag instanceof IntBinaryTag) {
+                IntBinaryTag tag = (IntBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof LongBinaryTag) {
+                LongBinaryTag tag = (LongBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof DoubleBinaryTag) {
+                DoubleBinaryTag tag = (DoubleBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof StringBinaryTag) {
+                StringBinaryTag tag = (StringBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof ListBinaryTag) {
+                ListBinaryTag tag = (ListBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+            else if (binaryTag instanceof EndBinaryTag) {
+                EndBinaryTag tag = (EndBinaryTag) binaryTag;
+                tag.type().write(tag, stream);
+            }
+
+        }
+        catch (IOException e) {
+            throw new EncoderException("Cannot write NBT CompoundTag");
+        }
+    }
+
+    public void writeNbtMessage(NbtMessage nbtMessage, Version version) {
+        if (version.moreOrEqual(Version.V1_20_3)) {
+            writeNamelessCompoundTag(nbtMessage.getTag());
+        }
+        else {
+            writeString(nbtMessage.getJson());
+        }
+    }
+
+    public <E extends Enum<E>> void writeEnumSet(EnumSet<E> enumset, Class<E> oclass) {
+        E[] enums = oclass.getEnumConstants();
+        BitSet bits = new BitSet(enums.length);
+
+        for (int i = 0; i < enums.length; ++i) {
+            bits.set(i, enumset.contains(enums[i]));
+        }
+
+        writeFixedBitSet(bits, enums.length, buf);
+    }
+
+    private static void writeFixedBitSet(BitSet bits, int size, ByteBuf buf) {
+        if (bits.length() > size) {
+            throw new StackOverflowError("BitSet too large (expected " + size + " got " + bits.size() + ")");
+        }
+        buf.writeBytes(Arrays.copyOf(bits.toByteArray(), (size + 8) >> 3));
+    }
+
     /* Delegated methods */
 
     @Override

src/main/java/ua/nanit/limbo/protocol/MetadataWriter.java

@@ -0,0 +1,10 @@
+package ua.nanit.limbo.protocol;
+
+import ua.nanit.limbo.protocol.registry.Version;
+
+@FunctionalInterface
+public interface MetadataWriter {
+
+    void writeData(ByteMessage message, Version version);
+
+}

src/main/java/ua/nanit/limbo/protocol/NbtMessage.java

@@ -0,0 +1,30 @@
+package ua.nanit.limbo.protocol;
+
+import net.kyori.adventure.nbt.BinaryTag;
+
+public class NbtMessage {
+
+    private String json;
+    private BinaryTag tag;
+
+    public NbtMessage(String json, BinaryTag tag) {
+        this.json = json;
+        this.tag = tag;
+    }
+
+    public String getJson() {
+        return json;
+    }
+
+    public void setJson(String json) {
+        this.json = json;
+    }
+
+    public BinaryTag getTag() {
+        return tag;
+    }
+
+    public void setTag(BinaryTag tag) {
+        this.tag = tag;
+    }
+}

src/main/java/ua/nanit/limbo/protocol/Packet.java

@@ -15,9 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol;
+package ua.nanit.limbo.protocol;
 
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public interface Packet {
 
@@ -25,4 +27,8 @@ public interface Packet {
 
     void decode(ByteMessage msg, Version version);
 
+    default void handle(ClientConnection conn, LimboServer server) {
+        // Ignored by default
+    }
+
 }

src/main/java/ua/nanit/limbo/protocol/PacketIn.java

@@ -15,9 +15,9 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol;
+package ua.nanit.limbo.protocol;
 
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public interface PacketIn extends Packet {
 

src/main/java/ua/nanit/limbo/protocol/PacketOut.java

@@ -15,9 +15,9 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol;
+package ua.nanit.limbo.protocol;
 
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public interface PacketOut extends Packet {
 

src/main/java/ua/nanit/limbo/protocol/PacketSnapshot.java

@@ -15,17 +15,16 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol;
+package ua.nanit.limbo.protocol;
 
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.registry.Version;
 
 import java.util.HashMap;
 import java.util.Map;
 
 /**
- * PacketSnapshot encodes packet to byt array for each MC version.
- * Some versions have same snapshot, so there are mappings
- * to avoid storing same bytes array for different versions
+ * PacketSnapshot encodes a packet to byte array for each MC version.
+ * Some versions have the same snapshot, so there are mappings to avoid data copying
  */
 public class PacketSnapshot implements PacketOut {
 

src/main/java/ua/nanit/limbo/protocol/packets/PacketHandshake.java

@@ -15,12 +15,14 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets;
+package ua.nanit.limbo.protocol.packets;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketIn;
-import ru.nanit.limbo.protocol.registry.State;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.registry.State;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketHandshake implements PacketIn {
 
@@ -62,4 +64,9 @@ public class PacketHandshake implements PacketIn {
     public String toString() {
         return getClass().getSimpleName();
     }
+
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
 }

src/main/java/ua/nanit/limbo/protocol/packets/configuration/PacketFinishConfiguration.java

@@ -0,0 +1,19 @@
+package ua.nanit.limbo.protocol.packets.configuration;
+
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.server.LimboServer;
+
+public class PacketFinishConfiguration implements PacketIn, PacketOut {
+
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName();
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/configuration/PacketRegistryData.java

@@ -0,0 +1,32 @@
+package ua.nanit.limbo.protocol.packets.configuration;
+
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.MetadataWriter;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.world.DimensionRegistry;
+
+public class PacketRegistryData implements PacketOut {
+
+    private DimensionRegistry dimensionRegistry;
+    private MetadataWriter metadataWriter;
+
+    public void setDimensionRegistry(DimensionRegistry dimensionRegistry) {
+        this.dimensionRegistry = dimensionRegistry;
+    }
+
+    public void setMetadataWriter(MetadataWriter metadataWriter) {
+        this.metadataWriter = metadataWriter;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        if (metadataWriter != null) {
+            if (version.moreOrEqual(Version.V1_20_5)) {
+                metadataWriter.writeData(msg, version);
+                return;
+            }
+        }
+        msg.writeNamelessCompoundTag(dimensionRegistry.getCodec_1_20());
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketDisconnect.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.login;
+package ua.nanit.limbo.protocol.packets.login;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketDisconnect implements PacketOut {
 

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketLoginAcknowledged.java

@@ -0,0 +1,19 @@
+package ua.nanit.limbo.protocol.packets.login;
+
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.server.LimboServer;
+
+public class PacketLoginAcknowledged implements PacketIn, PacketOut {
+
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName();
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketLoginPluginRequest.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.login;
+package ua.nanit.limbo.protocol.packets.login;
 
 import io.netty.buffer.ByteBuf;
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketLoginPluginRequest implements PacketOut {
 

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketLoginPluginResponse.java

@@ -15,11 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.login;
+package ua.nanit.limbo.protocol.packets.login;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketIn;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketLoginPluginResponse implements PacketIn {
 
@@ -50,6 +52,11 @@ public class PacketLoginPluginResponse implements PacketIn {
         }
     }
 
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
     @Override
     public String toString() {
         return getClass().getSimpleName();

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketLoginStart.java

@@ -15,11 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.login;
+package ua.nanit.limbo.protocol.packets.login;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketIn;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketLoginStart implements PacketIn {
 
@@ -34,6 +36,11 @@ public class PacketLoginStart implements PacketIn {
         this.username = msg.readString();
     }
 
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
     @Override
     public String toString() {
         return getClass().getSimpleName();

src/main/java/ua/nanit/limbo/protocol/packets/login/PacketLoginSuccess.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.login;
+package ua.nanit.limbo.protocol.packets.login;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 import java.util.UUID;
 
@@ -40,10 +40,18 @@ public class PacketLoginSuccess implements PacketOut {
     public void encode(ByteMessage msg, Version version) {
         if (version.moreOrEqual(Version.V1_16)) {
             msg.writeUuid(uuid);
-        } else {
+        } else if (version.moreOrEqual(Version.V1_7_6)) {
             msg.writeString(uuid.toString());
+        } else {
+            msg.writeString(uuid.toString().replace("-", ""));
         }
         msg.writeString(username);
+        if (version.moreOrEqual(Version.V1_19)) {
+            msg.writeVarInt(0);
+        }
+        if (version.moreOrEqual(Version.V1_20_5)) {
+            msg.writeBoolean(true);
+        }
     }
 
     @Override

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketBossBar.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.data.BossBar;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.data.BossBar;
 
 import java.util.UUID;
 
@@ -49,7 +49,7 @@ public class PacketBossBar implements PacketOut {
     public void encode(ByteMessage msg, Version version) {
         msg.writeUuid(uuid);
         msg.writeVarInt(0); // Create bossbar
-        msg.writeString(bossBar.getText());
+        msg.writeNbtMessage(bossBar.getText(), version);
         msg.writeFloat(bossBar.getHealth());
         msg.writeVarInt(bossBar.getColor().getIndex());
         msg.writeVarInt(bossBar.getDivision().getIndex());

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketChatMessage.java

@@ -15,25 +15,26 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 import java.util.UUID;
 
 public class PacketChatMessage implements PacketOut {
 
-    private String jsonData;
-    private Position position;
+    private NbtMessage message;
+    private PositionLegacy position;
     private UUID sender;
 
-    public void setJsonData(String jsonData) {
-        this.jsonData = jsonData;
+    public void setMessage(NbtMessage message) {
+        this.message = message;
     }
 
-    public void setPosition(Position position) {
+    public void setPosition(PositionLegacy position) {
         this.position = position;
     }
 
@@ -43,14 +44,20 @@ public class PacketChatMessage implements PacketOut {
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        msg.writeString(jsonData);
+        msg.writeNbtMessage(message, version);
+        if (version.moreOrEqual(Version.V1_19_1)) {
+            msg.writeBoolean(position.index == PositionLegacy.ACTION_BAR.index);
+        } else if (version.moreOrEqual(Version.V1_19)) {
+            msg.writeVarInt(position.index);
+        } else if (version.moreOrEqual(Version.V1_8)) {
             msg.writeByte(position.index);
+        }
 
-        if (version.moreOrEqual(Version.V1_16))
+        if (version.moreOrEqual(Version.V1_16) && version.less(Version.V1_19))
             msg.writeUuid(sender);
     }
 
-    public enum Position {
+    public enum PositionLegacy {
 
         CHAT(0),
         SYSTEM_MESSAGE(1),
@@ -58,7 +65,7 @@ public class PacketChatMessage implements PacketOut {
 
         private final int index;
 
-        Position(int index) {
+        PositionLegacy(int index) {
             this.index = index;
         }
 

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketDeclareCommands.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 import java.util.List;
 

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketEmptyChunk.java

@@ -0,0 +1,47 @@
+package ua.nanit.limbo.protocol.packets.play;
+
+import net.kyori.adventure.nbt.CompoundBinaryTag;
+import net.kyori.adventure.nbt.LongArrayBinaryTag;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+
+public class PacketEmptyChunk implements PacketOut {
+
+    private int x;
+    private int z;
+
+    public void setX(int x) {
+        this.x = x;
+    }
+
+    public void setZ(int z) {
+        this.z = z;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        msg.writeInt(x);
+        msg.writeInt(z);
+
+        LongArrayBinaryTag longArrayTag = LongArrayBinaryTag.longArrayBinaryTag(new long[37]);
+        CompoundBinaryTag tag = CompoundBinaryTag.builder()
+                .put("MOTION_BLOCKING", longArrayTag).build();
+        CompoundBinaryTag rootTag = CompoundBinaryTag.builder()
+                .put("root", tag).build();
+        msg.writeNamelessCompoundTag(rootTag);
+
+        byte[] sectionData = new byte[]{0, 0, 0, 0, 0, 0, 1, 0};
+        msg.writeVarInt(sectionData.length * 16);
+        for (int i = 0; i < 16; i++) {
+            msg.writeBytes(sectionData);
+        }
+
+        msg.writeVarInt(0);
+
+        byte[] lightData = new byte[]{1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, -1, -1, 0, 0};
+        msg.ensureWritable(lightData.length);
+        msg.writeBytes(lightData, 1, lightData.length - 1);
+    }
+    
+}

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketGameEvent.java

@@ -0,0 +1,25 @@
+package ua.nanit.limbo.protocol.packets.play;
+
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+
+public class PacketGameEvent implements PacketOut {
+
+    private byte type;
+    private float value;
+
+    public void setType(byte type) {
+        this.type = type;
+    }
+
+    public void setValue(float value) {
+        this.value = value;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        msg.writeByte(type);
+        msg.writeFloat(value);
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketJoinGame.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.world.dimension.DimensionRegistry;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.world.DimensionRegistry;
 
 public class PacketJoinGame implements PacketOut {
 
@@ -38,6 +38,8 @@ public class PacketJoinGame implements PacketOut {
     private boolean enableRespawnScreen;
     private boolean isDebug;
     private boolean isFlat;
+    private boolean limitedCrafting;
+    private boolean secureProfile;
 
     public void setEntityId(int entityId) {
         this.entityId = entityId;
@@ -95,22 +97,38 @@ public class PacketJoinGame implements PacketOut {
         isFlat = flat;
     }
 
+    public void setLimitedCrafting(boolean limitedCrafting) {
+        this.limitedCrafting = limitedCrafting;
+    }
+
+    public void setSecureProfile(boolean secureProfile) {
+        this.secureProfile = secureProfile;
+    }
+
     @Override
     public void encode(ByteMessage msg, Version version) {
         msg.writeInt(entityId);
 
-        if (version.fromTo(Version.V1_8, Version.V1_9_1)) {
+        if (version.fromTo(Version.V1_7_2, Version.V1_7_6)) {
+            msg.writeByte(gameMode == 3 ? 1 : gameMode);
+            msg.writeByte(dimensionRegistry.getDefaultDimension_1_16().getId());
+            msg.writeByte(0); // Difficulty
+            msg.writeByte(maxPlayers);
+            msg.writeString("flat"); // Level type
+        }
+
+        if (version.fromTo(Version.V1_8, Version.V1_9)) {
             msg.writeByte(gameMode);
-            msg.writeByte(dimensionRegistry.getDefaultDimension().getId());
+            msg.writeByte(dimensionRegistry.getDefaultDimension_1_16().getId());
             msg.writeByte(0); // Difficulty
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
             msg.writeBoolean(reducedDebugInfo);
         }
 
-        if (version.fromTo(Version.V1_9_2, Version.V1_13_2)) {
+        if (version.fromTo(Version.V1_9_1, Version.V1_13_2)) {
             msg.writeByte(gameMode);
-            msg.writeInt(dimensionRegistry.getDefaultDimension().getId());
+            msg.writeInt(dimensionRegistry.getDefaultDimension_1_16().getId());
             msg.writeByte(0); // Difficulty
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
@@ -119,7 +137,7 @@ public class PacketJoinGame implements PacketOut {
 
         if (version.fromTo(Version.V1_14, Version.V1_14_4)) {
             msg.writeByte(gameMode);
-            msg.writeInt(dimensionRegistry.getDefaultDimension().getId());
+            msg.writeInt(dimensionRegistry.getDefaultDimension_1_16().getId());
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
             msg.writeVarInt(viewDistance);
@@ -128,7 +146,7 @@ public class PacketJoinGame implements PacketOut {
 
         if (version.fromTo(Version.V1_15, Version.V1_15_2)) {
             msg.writeByte(gameMode);
-            msg.writeInt(dimensionRegistry.getDefaultDimension().getId());
+            msg.writeInt(dimensionRegistry.getDefaultDimension_1_16().getId());
             msg.writeLong(hashedSeed);
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
@@ -142,7 +160,7 @@ public class PacketJoinGame implements PacketOut {
             msg.writeByte(previousGameMode);
             msg.writeStringsArray(worldNames);
             msg.writeCompoundTag(dimensionRegistry.getOldCodec());
-            msg.writeString(dimensionRegistry.getDefaultDimension().getName());
+            msg.writeString(dimensionRegistry.getDefaultDimension_1_16().getName());
             msg.writeString(worldName);
             msg.writeLong(hashedSeed);
             msg.writeByte(maxPlayers);
@@ -158,8 +176,8 @@ public class PacketJoinGame implements PacketOut {
             msg.writeByte(gameMode);
             msg.writeByte(previousGameMode);
             msg.writeStringsArray(worldNames);
-            msg.writeCompoundTag(dimensionRegistry.getCodec());
-            msg.writeCompoundTag(dimensionRegistry.getDefaultDimension().getData());
+            msg.writeCompoundTag(dimensionRegistry.getCodec_1_16());
+            msg.writeCompoundTag(dimensionRegistry.getDefaultDimension_1_16().getData());
             msg.writeString(worldName);
             msg.writeLong(hashedSeed);
             msg.writeVarInt(maxPlayers);
@@ -170,13 +188,18 @@ public class PacketJoinGame implements PacketOut {
             msg.writeBoolean(isFlat);
         }
 
-        if (version.moreOrEqual(Version.V1_18)) {
+        if (version.fromTo(Version.V1_18, Version.V1_18_2)) {
             msg.writeBoolean(isHardcore);
             msg.writeByte(gameMode);
             msg.writeByte(previousGameMode);
             msg.writeStringsArray(worldNames);
-            msg.writeCompoundTag(dimensionRegistry.getCodec());
-            msg.writeCompoundTag(dimensionRegistry.getDefaultDimension().getData());
+            if (version.moreOrEqual(Version.V1_18_2)) {
+                msg.writeCompoundTag(dimensionRegistry.getCodec_1_18_2());
+                msg.writeCompoundTag(dimensionRegistry.getDefaultDimension_1_18_2().getData());
+            } else {
+                msg.writeCompoundTag(dimensionRegistry.getCodec_1_16());
+                msg.writeCompoundTag(dimensionRegistry.getDefaultDimension_1_16().getData());
+            }
             msg.writeString(worldName);
             msg.writeLong(hashedSeed);
             msg.writeVarInt(maxPlayers);
@@ -187,6 +210,96 @@ public class PacketJoinGame implements PacketOut {
             msg.writeBoolean(isDebug);
             msg.writeBoolean(isFlat);
         }
+
+        if (version.fromTo(Version.V1_19, Version.V1_19_4)) {
+            msg.writeBoolean(isHardcore);
+            msg.writeByte(gameMode);
+            msg.writeByte(previousGameMode);
+            msg.writeStringsArray(worldNames);
+            if (version.moreOrEqual(Version.V1_19_1)) {
+                if (version.moreOrEqual(Version.V1_19_4)) {
+                    msg.writeCompoundTag(dimensionRegistry.getCodec_1_19_4());
+                }
+                else {
+                    msg.writeCompoundTag(dimensionRegistry.getCodec_1_19_1());
+                }
+            }
+            else {
+                msg.writeCompoundTag(dimensionRegistry.getCodec_1_19());
+            }
+            msg.writeString(worldName); // World type
+            msg.writeString(worldName);
+            msg.writeLong(hashedSeed);
+            msg.writeVarInt(maxPlayers);
+            msg.writeVarInt(viewDistance);
+            msg.writeVarInt(viewDistance); // Simulation Distance
+            msg.writeBoolean(reducedDebugInfo);
+            msg.writeBoolean(enableRespawnScreen);
+            msg.writeBoolean(isDebug);
+            msg.writeBoolean(isFlat);
+            msg.writeBoolean(false);
+        }
+
+        if (version.equals(Version.V1_20)) {
+            msg.writeBoolean(isHardcore);
+            msg.writeByte(gameMode);
+            msg.writeByte(previousGameMode);
+            msg.writeStringsArray(worldNames);
+            msg.writeCompoundTag(dimensionRegistry.getCodec_1_20());
+            msg.writeString(worldName); // World type
+            msg.writeString(worldName);
+            msg.writeLong(hashedSeed);
+            msg.writeVarInt(maxPlayers);
+            msg.writeVarInt(viewDistance);
+            msg.writeVarInt(viewDistance); // Simulation Distance
+            msg.writeBoolean(reducedDebugInfo);
+            msg.writeBoolean(enableRespawnScreen);
+            msg.writeBoolean(isDebug);
+            msg.writeBoolean(isFlat);
+            msg.writeBoolean(false);
+            msg.writeVarInt(0);
+        }
+
+        if (version.fromTo(Version.V1_20_2, Version.V1_20_3)) {
+            msg.writeBoolean(isHardcore);
+            msg.writeStringsArray(worldNames);
+            msg.writeVarInt(maxPlayers);
+            msg.writeVarInt(viewDistance);
+            msg.writeVarInt(viewDistance); // Simulation Distance
+            msg.writeBoolean(reducedDebugInfo);
+            msg.writeBoolean(enableRespawnScreen);
+            msg.writeBoolean(limitedCrafting);
+            msg.writeString(worldName);
+            msg.writeString(worldName);
+            msg.writeLong(hashedSeed);
+            msg.writeByte(gameMode);
+            msg.writeByte(previousGameMode);
+            msg.writeBoolean(isDebug);
+            msg.writeBoolean(isFlat);
+            msg.writeBoolean(false);
+            msg.writeVarInt(0);
+        }
+
+        if (version.moreOrEqual(Version.V1_20_5)) {
+            msg.writeBoolean(isHardcore);
+            msg.writeStringsArray(worldNames);
+            msg.writeVarInt(maxPlayers);
+            msg.writeVarInt(viewDistance);
+            msg.writeVarInt(viewDistance); // Simulation Distance
+            msg.writeBoolean(reducedDebugInfo);
+            msg.writeBoolean(enableRespawnScreen);
+            msg.writeBoolean(limitedCrafting);
+            msg.writeVarInt(dimensionRegistry.getDimension_1_20_5().getId());
+            msg.writeString(worldName);
+            msg.writeLong(hashedSeed);
+            msg.writeByte(gameMode);
+            msg.writeByte(previousGameMode);
+            msg.writeBoolean(isDebug);
+            msg.writeBoolean(isFlat);
+            msg.writeBoolean(false);
+            msg.writeVarInt(0);
+            msg.writeBoolean(secureProfile);
+        }
     }
 
 }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketKeepAlive.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.Packet;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketKeepAlive implements Packet {
 
@@ -37,8 +37,10 @@ public class PacketKeepAlive implements Packet {
     public void encode(ByteMessage msg, Version version) {
         if (version.moreOrEqual(Version.V1_12_2)) {
             msg.writeLong(id);
-        } else {
+        } else if (version.moreOrEqual(Version.V1_8)) {
             msg.writeVarInt((int) id);
+        } else {
+            msg.writeInt((int) id);
         }
     }
 
@@ -46,8 +48,10 @@ public class PacketKeepAlive implements Packet {
     public void decode(ByteMessage msg, Version version) {
         if (version.moreOrEqual(Version.V1_12_2)) {
             this.id = msg.readLong();
-        } else {
+        } else if (version.moreOrEqual(Version.V1_8)) {
             this.id = msg.readVarInt();
+        } else {
+            this.id = msg.readInt();
         }
     }
 

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketPlayerAbilities.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketPlayerAbilities implements PacketOut {
 

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketPlayerInfo.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ua.nanit.limbo.protocol.packets.play;
+
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+
+import java.util.EnumSet;
+import java.util.UUID;
+
+/**
+ * This packet was very simplified and using only for ADD_PLAYER action
+ */
+public class PacketPlayerInfo implements PacketOut {
+
+    private int gameMode = 3;
+    private String username = "";
+    private UUID uuid;
+
+    public void setGameMode(int gameMode) {
+        this.gameMode = gameMode;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public void setUuid(UUID uuid) {
+        this.uuid = uuid;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        if (version.less(Version.V1_8)) {
+            msg.writeString(username);
+            msg.writeBoolean(true); // Is online
+            msg.writeShort(0);
+        } else {
+            if (version.moreOrEqual(Version.V1_19_3)) {
+                EnumSet<Action> actions = EnumSet.noneOf(Action.class);
+                actions.add(Action.ADD_PLAYER);
+                actions.add(Action.UPDATE_LISTED);
+                actions.add(Action.UPDATE_GAMEMODE);
+                msg.writeEnumSet(actions, Action.class);
+
+                msg.writeVarInt(1); // Array length (1 element)
+                msg.writeUuid(uuid); // UUID
+                msg.writeString(username); //Username
+                msg.writeVarInt(0); //Properties (0 is empty)
+
+                msg.writeBoolean(true); //Update listed
+                msg.writeVarInt(gameMode); //Gamemode
+                return;
+            }
+            
+            msg.writeVarInt(0); // Add player action
+            msg.writeVarInt(1);
+            msg.writeUuid(uuid);
+            msg.writeString(username);
+            msg.writeVarInt(0);
+            msg.writeVarInt(gameMode);
+            msg.writeVarInt(60);
+            msg.writeBoolean(false);
+            
+            if (version.moreOrEqual(Version.V1_19)) {
+                msg.writeBoolean(false);
+            }
+        }
+    }
+
+    public static enum Action {
+        ADD_PLAYER,
+        INITIALIZE_CHAT,
+        UPDATE_GAMEMODE,
+        UPDATE_LISTED,
+        UPDATE_LATENCY,
+        UPDATE_DISPLAY_NAME;
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketPlayerListHeader.java

@@ -15,28 +15,29 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketPlayerListHeader implements PacketOut {
 
-    private String header;
-    private String footer;
+    private NbtMessage header;
+    private NbtMessage footer;
 
-    public void setHeader(String header) {
+    public void setHeader(NbtMessage header) {
         this.header = header;
     }
 
-    public void setFooter(String footer) {
+    public void setFooter(NbtMessage footer) {
         this.footer = footer;
     }
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        msg.writeString(header);
-        msg.writeString(footer);
+        msg.writeNbtMessage(header, version);
+        msg.writeNbtMessage(footer, version);
     }
 }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketPlayerPositionAndLook.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketPlayerPositionAndLook implements PacketOut {
 
@@ -28,53 +28,38 @@ public class PacketPlayerPositionAndLook implements PacketOut {
     private double z;
     private float yaw;
     private float pitch;
-    private byte flags = 0x08;
     private int teleportId;
 
-    public void setX(double x) {
+    public PacketPlayerPositionAndLook() {}
+
+    public PacketPlayerPositionAndLook(double x, double y, double z, float yaw, float pitch, int teleportId) {
         this.x = x;
-    }
-
-    public void setY(double y) {
         this.y = y;
-    }
-
-    public void setZ(double z) {
         this.z = z;
-    }
-
-    public void setYaw(float yaw) {
         this.yaw = yaw;
-    }
-
-    public void setPitch(float pitch) {
         this.pitch = pitch;
-    }
-
-    public void setFlags(byte flags) {
-        this.flags = flags;
-    }
-
-    public void setTeleportId(int teleportId) {
         this.teleportId = teleportId;
     }
 
     @Override
     public void encode(ByteMessage msg, Version version) {
         msg.writeDouble(x);
-        msg.writeDouble(y);
+        msg.writeDouble(y + (version.less(Version.V1_8) ? 1.62F : 0));
         msg.writeDouble(z);
         msg.writeFloat(yaw);
         msg.writeFloat(pitch);
 
-        if (version.less(Version.V1_9)) {
-            msg.writeBoolean(true); // On ground
+        if (version.moreOrEqual(Version.V1_8)) {
+            msg.writeByte(0x08);
         } else {
-            msg.writeByte(flags);
+            msg.writeBoolean(true);
+        }
+
+        if (version.moreOrEqual(Version.V1_9)) {
             msg.writeVarInt(teleportId);
         }
 
-        if (version.moreOrEqual(Version.V1_17)) {
+        if (version.fromTo(Version.V1_17, Version.V1_19_3)) {
             msg.writeBoolean(false); // Dismount vehicle
         }
     }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketPluginMessage.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketPluginMessage implements PacketOut {
 
@@ -39,4 +39,5 @@ public class PacketPluginMessage implements PacketOut {
         msg.writeString(channel);
         msg.writeString(message);
     }
+
 }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketSpawnPosition.java

@@ -0,0 +1,30 @@
+package ua.nanit.limbo.protocol.packets.play;
+
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+
+public class PacketSpawnPosition implements PacketOut {
+
+    private long x;
+    private long y;
+    private long z;
+
+    public PacketSpawnPosition() { }
+
+    public PacketSpawnPosition(long x, long y, long z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        msg.writeLong(encodePosition(x, y ,z));
+        msg.writeFloat(0);
+    }
+
+    private static long encodePosition(long x, long y, long z) {
+        return ((x & 0x3FFFFFF) << 38) | ((z & 0x3FFFFFF) << 12) | (y & 0xFFF);
+    }
+}

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketTitleLegacy.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.data.Title;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.data.Title;
 
 public class PacketTitleLegacy implements PacketOut {
 
@@ -61,6 +61,8 @@ public class PacketTitleLegacy implements PacketOut {
             case SET_TIMES_AND_DISPLAY:
                 times.encode(msg, version);
                 break;
+            default:
+                throw new IllegalArgumentException("Invalid title action: " + action);
         }
     }
 

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketTitleSetSubTitle.java

@@ -15,23 +15,24 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketTitleSetSubTitle implements PacketOut {
 
-    private String subtitle;
+    private NbtMessage subtitle;
 
-    public void setSubtitle(String subtitle) {
+    public void setSubtitle(NbtMessage subtitle) {
         this.subtitle = subtitle;
     }
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        msg.writeString(subtitle);
+        msg.writeNbtMessage(subtitle, version);
     }
 
 }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketTitleSetTitle.java

@@ -15,23 +15,24 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketTitleSetTitle implements PacketOut {
 
-    private String title;
+    private NbtMessage title;
 
-    public void setTitle(String title) {
+    public void setTitle(NbtMessage title) {
         this.title = title;
     }
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        msg.writeString(title);
+        msg.writeNbtMessage(title, version);
     }
 
 }

src/main/java/ua/nanit/limbo/protocol/packets/play/PacketTitleTimes.java

@@ -15,11 +15,11 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.play;
+package ua.nanit.limbo.protocol.packets.play;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
 
 public class PacketTitleTimes implements PacketOut {
 

src/main/java/ua/nanit/limbo/protocol/packets/status/PacketStatusPing.java

@@ -15,11 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.status;
+package ua.nanit.limbo.protocol.packets.status;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.Packet;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketStatusPing implements Packet {
 
@@ -35,6 +37,11 @@ public class PacketStatusPing implements Packet {
         this.randomId = msg.readLong();
     }
 
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
     @Override
     public String toString() {
         return getClass().getSimpleName();

src/main/java/ua/nanit/limbo/protocol/packets/status/PacketStatusRequest.java

@@ -15,11 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.status;
+package ua.nanit.limbo.protocol.packets.status;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketIn;
-import ru.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketIn;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketStatusRequest implements PacketIn {
 
@@ -28,6 +30,11 @@ public class PacketStatusRequest implements PacketIn {
 
     }
 
+    @Override
+    public void handle(ClientConnection conn, LimboServer server) {
+        server.getPacketHandler().handle(conn, this);
+    }
+
     @Override
     public String toString() {
         return getClass().getSimpleName();

src/main/java/ua/nanit/limbo/protocol/packets/status/PacketStatusResponse.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.packets.status;
+package ua.nanit.limbo.protocol.packets.status;
 
-import ru.nanit.limbo.protocol.ByteMessage;
-import ru.nanit.limbo.protocol.PacketOut;
-import ru.nanit.limbo.protocol.registry.Version;
-import ru.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.protocol.ByteMessage;
+import ua.nanit.limbo.protocol.PacketOut;
+import ua.nanit.limbo.protocol.registry.Version;
+import ua.nanit.limbo.server.LimboServer;
 
 public class PacketStatusResponse implements PacketOut {
 
@@ -36,9 +36,16 @@ public class PacketStatusResponse implements PacketOut {
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        int protocol = server.getConfig().getInfoForwarding().isNone()
+        int protocol;
+        int staticProtocol =  server.getConfig().getPingData().getProtocol();
+
+        if (staticProtocol > 0) {
+            protocol = staticProtocol;
+        } else {
+            protocol = server.getConfig().getInfoForwarding().isNone()
                     ? version.getProtocolNumber()
                     : Version.getMax().getProtocolNumber();
+        }
 
         String ver = server.getConfig().getPingData().getVersion();
         String desc = server.getConfig().getPingData().getDescription();

src/main/java/ua/nanit/limbo/protocol/registry/State.java

@@ -15,20 +15,21 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.registry;
+package ua.nanit.limbo.protocol.registry;
 
-import ru.nanit.limbo.protocol.Packet;
-import ru.nanit.limbo.protocol.packets.PacketHandshake;
-import ru.nanit.limbo.protocol.packets.login.*;
-import ru.nanit.limbo.protocol.packets.play.*;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusPing;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusRequest;
-import ru.nanit.limbo.protocol.packets.status.PacketStatusResponse;
+import ua.nanit.limbo.protocol.Packet;
+import ua.nanit.limbo.protocol.packets.PacketHandshake;
+import ua.nanit.limbo.protocol.packets.login.*;
+import ua.nanit.limbo.protocol.packets.play.*;
+import ua.nanit.limbo.protocol.packets.configuration.*;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusPing;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusRequest;
+import ua.nanit.limbo.protocol.packets.status.PacketStatusResponse;
 
 import java.util.*;
 import java.util.function.Supplier;
 
-import static ru.nanit.limbo.protocol.registry.Version.*;
+import static ua.nanit.limbo.protocol.registry.Version.*;
 
 public enum State {
 
@@ -63,6 +64,10 @@ public enum State {
             serverBound.register(PacketLoginPluginResponse::new,
                     map(0x02, Version.getMin(), Version.getMax())
             );
+            serverBound.register(
+                    PacketLoginAcknowledged::new,
+                    map(0x03, V1_20_2, Version.getMax())
+            );
             clientBound.register(PacketDisconnect::new,
                     map(0x00, Version.getMin(), Version.getMax())
             );
@@ -74,17 +79,69 @@ public enum State {
             );
         }
     },
-    PLAY(3) {
+    CONFIGURATION(3) {
+        {
+            clientBound.register(
+                    PacketPluginMessage::new,
+                    map(0x00, V1_20_2, V1_20_3),
+                    map(0x01, V1_20_5, V1_21)
+            );
+            clientBound.register(
+                    PacketDisconnect::new,
+                    map(0x01, V1_20_2, V1_20_3),
+                    map(0x02, V1_20_5, V1_21)
+            );
+            clientBound.register(
+                    PacketFinishConfiguration::new,
+                    map(0x02, V1_20_2, V1_20_3),
+                    map(0x03, V1_20_5, V1_21)
+            );
+            clientBound.register(
+                    PacketKeepAlive::new,
+                    map(0x03, V1_20_2, V1_20_3),
+                    map(0x04, V1_20_5, V1_21)
+            );
+            clientBound.register(
+                    PacketRegistryData::new,
+                    map(0x05, V1_20_2, V1_20_3),
+                    map(0x07, V1_20_5, V1_21)
+            );
+
+            serverBound.register(
+                    PacketPluginMessage::new,
+                    map(0x01, V1_20_2, V1_20_3),
+                    map(0x02, V1_20_2, V1_21)
+            );
+            serverBound.register(
+                    PacketFinishConfiguration::new,
+                    map(0x02, V1_20_2, V1_20_3),
+                    map(0x03, V1_20_5, V1_21)
+            );
+            serverBound.register(
+                    PacketKeepAlive::new,
+                    map(0x03, V1_20_2, V1_20_3),
+                    map(0x04, V1_20_5, V1_21)
+            );
+        }
+    },
+    PLAY(4) {
         {
             serverBound.register(PacketKeepAlive::new,
-                    map(0x00, V1_8, V1_8),
+                    map(0x00, V1_7_2, V1_8),
                     map(0x0B, V1_9, V1_11_1),
                     map(0x0C, V1_12, V1_12),
                     map(0x0B, V1_12_1, V1_12_2),
                     map(0x0E, V1_13, V1_13_2),
                     map(0x0F, V1_14, V1_15_2),
                     map(0x10, V1_16, V1_16_4),
-                    map(0x0F, V1_17, V1_18)
+                    map(0x0F, V1_17, V1_18_2),
+                    map(0x11, V1_19, V1_19),
+                    map(0x12, V1_19_1, V1_19_1),
+                    map(0x11, V1_19_3, V1_19_3),
+                    map(0x12, V1_19_4, V1_20),
+                    map(0x14, V1_20_2, V1_20_2),
+                    map(0x15, V1_20_3, V1_20_3),
+                    map(0x18, V1_20_5, V1_21)
             );
 
             clientBound.register(PacketDeclareCommands::new,
@@ -92,16 +149,26 @@ public enum State {
                     map(0x12, V1_15, V1_15_2),
                     map(0x11, V1_16, V1_16_1),
                     map(0x10, V1_16_2, V1_16_4),
-                    map(0x12, V1_17, V1_18)
+                    map(0x12, V1_17, V1_18_2),
+                    map(0x0F, V1_19, V1_19_1),
+                    map(0x0E, V1_19_3, V1_19_3),
+                    map(0x10, V1_19_4, V1_20),
+                    map(0x11, V1_20_2, V1_21)
             );
             clientBound.register(PacketJoinGame::new,
-                    map(0x01, V1_8, V1_8),
+                    map(0x01, V1_7_2, V1_8),
                     map(0x23, V1_9, V1_12_2),
                     map(0x25, V1_13, V1_14_4),
                     map(0x26, V1_15, V1_15_2),
                     map(0x25, V1_16, V1_16_1),
                     map(0x24, V1_16_2, V1_16_4),
-                    map(0x26, V1_17, V1_18)
+                    map(0x26, V1_17, V1_18_2),
+                    map(0x23, V1_19, V1_19),
+                    map(0x25, V1_19_1, V1_19_1),
+                    map(0x24, V1_19_3, V1_19_3),
+                    map(0x28, V1_19_4, V1_20),
+                    map(0x29, V1_20_2, V1_20_3),
+                    map(0x2B, V1_20_5, V1_21)
             );
             clientBound.register(PacketPluginMessage::new,
                     map(0x19, V1_13, V1_13_2),
@@ -109,10 +176,16 @@ public enum State {
                     map(0x19, V1_15, V1_15_2),
                     map(0x18, V1_16, V1_16_1),
                     map(0x17, V1_16_2, V1_16_4),
-                    map(0x18, V1_17, V1_18)
+                    map(0x18, V1_17, V1_18_2),
+                    map(0x15, V1_19, V1_19),
+                    map(0x16, V1_19_1, V1_19_1),
+                    map(0x15, V1_19_3, V1_19_3),
+                    map(0x17, V1_19_4, V1_20),
+                    map(0x18, V1_20_2, V1_20_3),
+                    map(0x19, V1_20_5, V1_21)
             );
             clientBound.register(PacketPlayerAbilities::new,
-                    map(0x39, V1_8, V1_8),
+                    map(0x39, V1_7_2, V1_8),
                     map(0x2B, V1_9, V1_12),
                     map(0x2C, V1_12_1, V1_12_2),
                     map(0x2E, V1_13, V1_13_2),
@@ -120,10 +193,16 @@ public enum State {
                     map(0x32, V1_15, V1_15_2),
                     map(0x31, V1_16, V1_16_1),
                     map(0x30, V1_16_2, V1_16_4),
-                    map(0x32, V1_17, V1_18)
+                    map(0x32, V1_17, V1_18_2),
+                    map(0x2F, V1_19, V1_19),
+                    map(0x31, V1_19_1, V1_19_1),
+                    map(0x30, V1_19_3, V1_19_3),
+                    map(0x34, V1_19_4, V1_20),
+                    map(0x36, V1_20_2, V1_20_3),
+                    map(0x38, V1_20_5, V1_21)
             );
             clientBound.register(PacketPlayerPositionAndLook::new,
-                    map(0x08, V1_8, V1_8),
+                    map(0x08, V1_7_2, V1_8),
                     map(0x2E, V1_9, V1_12),
                     map(0x2F, V1_12_1, V1_12_2),
                     map(0x32, V1_13, V1_13_2),
@@ -131,34 +210,56 @@ public enum State {
                     map(0x36, V1_15, V1_15_2),
                     map(0x35, V1_16, V1_16_1),
                     map(0x34, V1_16_2, V1_16_4),
-                    map(0x38, V1_17, V1_18)
+                    map(0x38, V1_17, V1_18_2),
+                    map(0x36, V1_19, V1_19),
+                    map(0x39, V1_19_1, V1_19_1),
+                    map(0x38, V1_19_3, V1_19_3),
+                    map(0x3C, V1_19_4, V1_20),
+                    map(0x3E, V1_20_2, V1_20_3),
+                    map(0x40, V1_20_5, V1_21)
             );
             clientBound.register(PacketKeepAlive::new,
-                    map(0x00, V1_8, V1_8),
+                    map(0x00, V1_7_2, V1_8),
                     map(0x1F, V1_9, V1_12_2),
                     map(0x21, V1_13, V1_13_2),
                     map(0x20, V1_14, V1_14_4),
                     map(0x21, V1_15, V1_15_2),
                     map(0x20, V1_16, V1_16_1),
                     map(0x1F, V1_16_2, V1_16_4),
-                    map(0x21, V1_17, V1_18)
+                    map(0x21, V1_17, V1_18_2),
+                    map(0x1E, V1_19, V1_19),
+                    map(0x20, V1_19_1, V1_19_1),
+                    map(0x1F, V1_19_3, V1_19_3),
+                    map(0x23, V1_19_4, V1_20),
+                    map(0x24, V1_20_2, V1_20_3),
+                    map(0x26, V1_20_5, V1_21)
             );
             clientBound.register(PacketChatMessage::new,
-                    map(0x02, V1_8, V1_8),
+                    map(0x02, V1_7_2, V1_8),
                     map(0x0F, V1_9, V1_12_2),
                     map(0x0E, V1_13, V1_14_4),
                     map(0x0F, V1_15, V1_15_2),
                     map(0x0E, V1_16, V1_16_4),
-                    map(0x0F, V1_17, V1_18)
+                    map(0x0F, V1_17, V1_18_2),
+                    map(0x5F, V1_19, V1_19),
+                    map(0x62, V1_19_1, V1_19_1),
+                    map(0x60, V1_19_3, V1_19_3),
+                    map(0x64, V1_19_4, V1_20),
+                    map(0x67, V1_20_2, V1_20_2),
+                    map(0x69, V1_20_3, V1_20_3),
+                    map(0x6C, V1_20_5, V1_21)
             );
             clientBound.register(PacketBossBar::new,
                     map(0x0C, V1_9, V1_14_4),
                     map(0x0D, V1_15, V1_15_2),
                     map(0x0C, V1_16, V1_16_4),
-                    map(0x0D, V1_17, V1_18)
+                    map(0x0D, V1_17, V1_18_2),
+                    map(0x0A, V1_19, V1_19_3),
+                    map(0x0B, V1_19_4, V1_20),
+                    map(0x0A, V1_20_2, V1_21)
             );
             clientBound.register(PacketPlayerInfo::new,
-                    map(0x38, V1_8, V1_8),
+                    map(0x38, V1_7_2, V1_8),
                     map(0x2D, V1_9, V1_12),
                     map(0x2E, V1_12_1, V1_12_2),
                     map(0x30, V1_13, V1_13_2),
@@ -166,7 +267,13 @@ public enum State {
                     map(0x34, V1_15, V1_15_2),
                     map(0x33, V1_16, V1_16_1),
                     map(0x32, V1_16_2, V1_16_4),
-                    map(0x36, V1_17, V1_18)
+                    map(0x36, V1_17, V1_18_2),
+                    map(0x34, V1_19, V1_19),
+                    map(0x37, V1_19_1, V1_19_1),
+                    map(0x36, V1_19_3, V1_19_3),
+                    map(0x3A, V1_19_4, V1_20),
+                    map(0x3C, V1_20_2, V1_20_3),
+                    map(0x3E, V1_20_5, V1_21)
             );
             clientBound.register(PacketTitleLegacy::new,
                     map(0x45, V1_8, V1_11_1),
@@ -179,15 +286,33 @@ public enum State {
             );
             clientBound.register(PacketTitleSetTitle::new,
                     map(0x59, V1_17, V1_17_1),
-                    map(0x5A, V1_18, V1_18)
+                    map(0x5A, V1_18, V1_19),
+                    map(0x5D, V1_19_1, V1_19_1),
+                    map(0x5B, V1_19_3, V1_19_3),
+                    map(0x5F, V1_19_4, V1_20),
+                    map(0x61, V1_20_2, V1_20_2),
+                    map(0x63, V1_20_3, V1_20_3),
+                    map(0x65, V1_20_5, V1_21)
             );
             clientBound.register(PacketTitleSetSubTitle::new,
                     map(0x57, V1_17, V1_17_1),
-                    map(0x58, V1_18, V1_18)
+                    map(0x58, V1_18, V1_19),
+                    map(0x5B, V1_19_1, V1_19_1),
+                    map(0x59, V1_19_3, V1_19_3),
+                    map(0x5D, V1_19_4, V1_20),
+                    map(0x5F, V1_20_2, V1_20_2),
+                    map(0x61, V1_20_3, V1_20_3),
+                    map(0x63, V1_20_5, V1_21)
             );
             clientBound.register(PacketTitleTimes::new,
                     map(0x5A, V1_17, V1_17_1),
-                    map(0x5B, V1_18, V1_18)
+                    map(0x5B, V1_18, V1_19),
+                    map(0x5E, V1_19_1, V1_19_1),
+                    map(0x5C, V1_19_3, V1_19_3),
+                    map(0x60, V1_19_4, V1_20),
+                    map(0x62, V1_20_2, V1_20_2),
+                    map(0x64, V1_20_3, V1_20_3),
+                    map(0x66, V1_20_5, V1_21)
             );
             clientBound.register(PacketPlayerListHeader::new,
                     map(0x47, V1_8, V1_8),
@@ -200,7 +325,29 @@ public enum State {
                     map(0x54, V1_15, V1_15_2),
                     map(0x53, V1_16, V1_16_4),
                     map(0x5E, V1_17, V1_17_1),
-                    map(0x5F, V1_18, V1_18)
+                    map(0x5F, V1_18, V1_18_2),
+                    map(0x60, V1_19, V1_19),
+                    map(0x63, V1_19_1, V1_19_1),
+                    map(0x61, V1_19_3, V1_19_3),
+                    map(0x65, V1_19_4, V1_20),
+                    map(0x68, V1_20_2, V1_20_2),
+                    map(0x6A, V1_20_3, V1_20_3),
+                    map(0x6D, V1_20_5, V1_21)
+            );
+            clientBound.register(PacketSpawnPosition::new,
+                    map(0x4C, V1_19_3, V1_19_3),
+                    map(0x50, V1_19_4, V1_20),
+                    map(0x52, V1_20_2, V1_20_2),
+                    map(0x54, V1_20_3, V1_20_3),
+                    map(0x56, V1_20_5, V1_21)
+            );
+            clientBound.register(PacketGameEvent::new,
+                    map(0x20, V1_20_3, V1_20_3),
+                    map(0x22, V1_20_5, V1_21)
+            );
+            clientBound.register(PacketEmptyChunk::new,
+                    map(0x25, V1_20_3, V1_20_3),
+                    map(0x27, V1_20_5, V1_21)
             );
         }
     };

src/main/java/ua/nanit/limbo/protocol/registry/Version.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.protocol.registry;
+package ua.nanit.limbo.protocol.registry;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -23,6 +23,10 @@ import java.util.Map;
 public enum Version {
 
     UNDEFINED(-1),
+    V1_7_2(4),
+    // 1.7.2-1.7.5 has same protocol numbers
+    V1_7_6(5),
+    // 1.7.6-1.7.10 has same protocol numbers
     V1_8(47),
     // 1.8-1.8.8 has same protocol numbers
     V1_9(107),
@@ -56,8 +60,21 @@ public enum Version {
     // 1.16.5 has same protocol number
     V1_17(755),
     V1_17_1(756),
-    V1_18(757);
+    V1_18(757),
     // 1.18.1 has same protocol number
+    V1_18_2(758),
+    V1_19(759),
+    V1_19_1(760),
+    // 1.19.2 has same protocol number
+    V1_19_3(761),
+    V1_19_4(762),
+    V1_20(763),
+    // 1.20.1 has same protocol number
+    V1_20_2(764),
+    V1_20_3(765),
+    V1_20_5(766),
+    // 1.20.6 has same protocol number
+    V1_21(767);
 
     private static final Map<Integer, Version> VERSION_MAP;
     private static final Version MAX;
@@ -116,7 +133,7 @@ public enum Version {
     }
 
     public static Version getMin() {
-        return V1_8;
+        return V1_7_2;
     }
 
     public static Version getMax() {

src/main/java/ua/nanit/limbo/server/Command.java

@@ -0,0 +1,9 @@
+package ua.nanit.limbo.server;
+
+public interface Command {
+
+    void execute();
+
+    String description();
+
+}

src/main/java/ua/nanit/limbo/server/CommandManager.java

@@ -0,0 +1,59 @@
+package ua.nanit.limbo.server;
+
+import ua.nanit.limbo.server.commands.*;
+
+import java.util.*;
+
+public final class CommandManager extends Thread {
+
+    private final Map<String, Command> commands = new HashMap<>();
+
+    public Map<String, Command> getCommands() {
+        return Collections.unmodifiableMap(commands);
+    }
+
+    public Command getCommand(String name) {
+        return commands.get(name.toLowerCase());
+    }
+
+    public void register(Command cmd, String... aliases) {
+        for (String alias : aliases) {
+            commands.put(alias.toLowerCase(), cmd);
+        }
+    }
+
+    @Override
+    public void run() {
+        Scanner scanner = new Scanner(System.in);
+        String command;
+
+        while (true) {
+            try {
+                command = scanner.nextLine().trim();
+            } catch (NoSuchElementException e) {
+                break;
+            }
+
+            Command handler = getCommand(command);
+
+            if (handler != null) {
+                try {
+                    handler.execute();
+                } catch (Throwable t) {
+                    Log.error("Cannot execute command:", t);
+                }
+                continue;
+            }
+
+            Log.info("Unknown command. Type \"help\" to get commands list");
+        }
+    }
+
+    public void registerAll(LimboServer server) {
+        register(new CmdHelp(server), "help");
+        register(new CmdConn(server), "conn");
+        register(new CmdMem(), "mem");
+        register(new CmdStop(), "stop");
+        register(new CmdVersion(), "version", "ver");
+    }
+}

src/main/java/ua/nanit/limbo/server/Connections.java

@@ -15,9 +15,9 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server;
+package ua.nanit.limbo.server;
 
-import ru.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.connection.ClientConnection;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -43,12 +43,12 @@ public final class Connections {
 
     public void addConnection(ClientConnection connection) {
         connections.put(connection.getUuid(), connection);
-        Logger.info("Player %s connected (%s) [%s]", connection.getUsername(),
+        Log.info("Player %s connected (%s) [%s]", connection.getUsername(),
                 connection.getAddress(), connection.getClientVersion());
     }
 
     public void removeConnection(ClientConnection connection) {
         connections.remove(connection.getUuid());
-        Logger.info("Player %s disconnected", connection.getUsername());
+        Log.info("Player %s disconnected", connection.getUsername());
     }
 }

src/main/java/ua/nanit/limbo/server/LimboServer.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server;
+package ua.nanit.limbo.server;
 
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.ChannelOption;
@@ -27,10 +27,12 @@ import io.netty.channel.epoll.EpollServerSocketChannel;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.util.ResourceLeakDetector;
-import ru.nanit.limbo.configuration.LimboConfig;
-import ru.nanit.limbo.connection.ClientChannelInitializer;
-import ru.nanit.limbo.connection.ClientConnection;
-import ru.nanit.limbo.world.dimension.DimensionRegistry;
+import ua.nanit.limbo.configuration.LimboConfig;
+import ua.nanit.limbo.connection.ClientChannelInitializer;
+import ua.nanit.limbo.connection.ClientConnection;
+import ua.nanit.limbo.connection.PacketHandler;
+import ua.nanit.limbo.connection.PacketSnapshots;
+import ua.nanit.limbo.world.DimensionRegistry;
 
 import java.nio.file.Paths;
 import java.util.concurrent.ScheduledFuture;
@@ -39,6 +41,7 @@ import java.util.concurrent.TimeUnit;
 public final class LimboServer {
 
     private LimboConfig config;
+    private PacketHandler packetHandler;
     private Connections connections;
     private DimensionRegistry dimensionRegistry;
     private ScheduledFuture<?> keepAliveTask;
@@ -46,10 +49,16 @@ public final class LimboServer {
     private EventLoopGroup bossGroup;
     private EventLoopGroup workerGroup;
 
+    private CommandManager commandManager;
+
     public LimboConfig getConfig() {
         return config;
     }
 
+    public PacketHandler getPacketHandler() {
+        return packetHandler;
+    }
+
     public Connections getConnections() {
         return connections;
     }
@@ -58,19 +67,25 @@ public final class LimboServer {
         return dimensionRegistry;
     }
 
+    public CommandManager getCommandManager() {
+        return commandManager;
+    }
+
     public void start() throws Exception {
-        Logger.info("Starting server...");
-
-        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
-
         config = new LimboConfig(Paths.get("./"));
         config.load();
 
+        Log.setLevel(config.getDebugLevel());
+        Log.info("Starting server...");
+
+        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
+
+        packetHandler = new PacketHandler(this);
         dimensionRegistry = new DimensionRegistry(this);
         dimensionRegistry.load(config.getDimensionType());
         connections = new Connections();
 
-        ClientConnection.initPackets(this);
+        PacketSnapshots.initPackets(this);
 
         startBootstrap();
 
@@ -78,9 +93,13 @@ public final class LimboServer {
 
         Runtime.getRuntime().addShutdownHook(new Thread(this::stop, "NanoLimbo shutdown thread"));
 
-        Logger.info("Server started on %s", config.getAddress());
+        Log.info("Server started on %s", config.getAddress());
 
-        Logger.setLevel(config.getDebugLevel());
+        commandManager = new CommandManager();
+        commandManager.registerAll(this);
+        commandManager.start();
+
+        System.gc();
     }
 
     private void startBootstrap() {
@@ -90,12 +109,12 @@ public final class LimboServer {
             bossGroup = new EpollEventLoopGroup(config.getBossGroupSize());
             workerGroup = new EpollEventLoopGroup(config.getWorkerGroupSize());
             channelClass = EpollServerSocketChannel.class;
-            Logger.debug("Using Epoll transport type");
+            Log.debug("Using Epoll transport type");
         } else {
             bossGroup = new NioEventLoopGroup(config.getBossGroupSize());
             workerGroup = new NioEventLoopGroup(config.getWorkerGroupSize());
             channelClass = NioServerSocketChannel.class;
-            Logger.debug("Using Java NIO transport type");
+            Log.debug("Using Java NIO transport type");
         }
 
         new ServerBootstrap()
@@ -112,6 +131,8 @@ public final class LimboServer {
     }
 
     private void stop() {
+        Log.info("Stopping server...");
+
         if (keepAliveTask != null) {
             keepAliveTask.cancel(true);
         }
@@ -123,6 +144,8 @@ public final class LimboServer {
         if (workerGroup != null) {
             workerGroup.shutdownGracefully();
         }
+
+        Log.info("Server stopped, Goodbye!");
     }
 
 }

src/main/java/ua/nanit/limbo/server/Log.java

@@ -15,63 +15,73 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server;
+package ua.nanit.limbo.server;
 
-import java.time.LocalTime;
-import java.time.format.DateTimeFormatter;
+import ch.qos.logback.classic.Logger;
+import org.slf4j.LoggerFactory;
 
-public final class Logger {
+public final class Log {
 
-    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("hh:mm:ss");
+    private static final Logger LOGGER = (Logger) LoggerFactory.getLogger("Limbo");
     private static int debugLevel = Level.INFO.getIndex();
 
-    private Logger() {}
-
-    public static int getLevel() {
-        return debugLevel;
-    }
+    private Log() {}
 
     public static void info(Object msg, Object... args) {
-        print(Level.INFO, msg, null, args);
+        LOGGER.info(String.format(msg.toString(), args));
     }
 
     public static void debug(Object msg, Object... args) {
-        print(Level.DEBUG, msg, null, args);
+        LOGGER.debug(String.format(msg.toString(), args));
     }
 
     public static void warning(Object msg, Object... args) {
-        print(Level.WARNING, msg, null, args);
+        LOGGER.warn(String.format(msg.toString(), args));
     }
 
     public static void warning(Object msg, Throwable t, Object... args) {
-        print(Level.WARNING, msg, t, args);
+        LOGGER.warn(String.format(msg.toString(), args), t);
     }
 
     public static void error(Object msg, Object... args) {
-        print(Level.ERROR, msg, null, args);
+        LOGGER.error(msg.toString(), args);
     }
 
     public static void error(Object msg, Throwable t, Object... args) {
-        print(Level.ERROR, msg, t, args);
+        LOGGER.error(String.format(msg.toString(), args), t);
     }
 
-    public static void print(Level level, Object msg, Throwable t, Object... args) {
-        if (debugLevel >= level.getIndex()) {
-            System.out.printf("%s: %s%n", getPrefix(level), String.format(msg.toString(), args));
-            if (t != null) t.printStackTrace();
-        }
-    }
-
-    private static String getPrefix(Level level) {
-        return String.format("[%s] [%s]", getTime(), level.getDisplay());
-    }
-
-    private static String getTime() {
-        return LocalTime.now().format(FORMATTER);
+    public static boolean isDebug() {
+        return debugLevel >= Level.DEBUG.getIndex();
     }
 
     static void setLevel(int level) {
         debugLevel = level;
+
+        Logger logback = getRootLogger();
+
+        if (logback != null) {
+            logback.setLevel(convertLevel(level));
+        }
+    }
+
+    private static Logger getRootLogger() {
+        return (Logger) LoggerFactory.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
+    }
+
+    private static ch.qos.logback.classic.Level convertLevel(int level) {
+        switch (level) {
+            case 0:
+                return ch.qos.logback.classic.Level.ERROR;
+            case 1:
+                return ch.qos.logback.classic.Level.WARN;
+            case 2:
+                return ch.qos.logback.classic.Level.INFO;
+            case 3:
+                return ch.qos.logback.classic.Level.DEBUG;
+            default:
+                throw new IllegalStateException("Undefined log level: " + level);
+        }
     }
 
     public enum Level {

src/main/java/ua/nanit/limbo/server/commands/CmdConn.java

@@ -0,0 +1,24 @@
+package ua.nanit.limbo.server.commands;
+
+import ua.nanit.limbo.server.Command;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
+
+public class CmdConn implements Command {
+
+    private final LimboServer server;
+
+    public CmdConn(LimboServer server) {
+        this.server = server;
+    }
+
+    @Override
+    public void execute() {
+        Log.info("Connections: %d", server.getConnections().getCount());
+    }
+
+    @Override
+    public String description() {
+        return "Display connections count";
+    }
+}

src/main/java/ua/nanit/limbo/server/commands/CmdHelp.java

@@ -0,0 +1,32 @@
+package ua.nanit.limbo.server.commands;
+
+import ua.nanit.limbo.server.Command;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
+
+import java.util.Map;
+
+public class CmdHelp implements Command {
+
+    private final LimboServer server;
+
+    public CmdHelp(LimboServer server) {
+        this.server = server;
+    }
+
+    @Override
+    public void execute() {
+        Map<String, Command> commands = server.getCommandManager().getCommands();
+
+        Log.info("Available commands:");
+
+        for (Map.Entry<String, Command> entry : commands.entrySet()) {
+            Log.info("%s - %s", entry.getKey(), entry.getValue().description());
+        }
+    }
+
+    @Override
+    public String description() {
+        return "Show this message";
+    }
+}

src/main/java/ua/nanit/limbo/server/commands/CmdMem.java

@@ -0,0 +1,28 @@
+package ua.nanit.limbo.server.commands;
+
+import ua.nanit.limbo.server.Command;
+import ua.nanit.limbo.server.Log;
+
+public class CmdMem implements Command {
+
+    @Override
+    public void execute() {
+        Runtime runtime = Runtime.getRuntime();
+        long mb = 1024 * 1024;
+        long used = (runtime.totalMemory() - runtime.freeMemory()) / mb;
+        long total = runtime.totalMemory() / mb;
+        long free = runtime.freeMemory() / mb;
+        long max = runtime.maxMemory() / mb;
+
+        Log.info("Memory usage:");
+        Log.info("Used: %d MB", used);
+        Log.info("Total: %d MB", total);
+        Log.info("Free: %d MB", free);
+        Log.info("Max: %d MB", max);
+    }
+
+    @Override
+    public String description() {
+        return "Display memory usage";
+    }
+}

src/main/java/ua/nanit/limbo/server/commands/CmdStop.java

@@ -0,0 +1,16 @@
+package ua.nanit.limbo.server.commands;
+
+import ua.nanit.limbo.server.Command;
+
+public class CmdStop implements Command {
+
+    @Override
+    public void execute() {
+        System.exit(0);
+    }
+
+    @Override
+    public String description() {
+        return "Stop the server";
+    }
+}

src/main/java/ua/nanit/limbo/server/commands/CmdVersion.java

@@ -0,0 +1,18 @@
+package ua.nanit.limbo.server.commands;
+
+import ua.nanit.limbo.server.Command;
+import ua.nanit.limbo.server.Log;
+import ua.nanit.limbo.BuildConfig;
+
+public class CmdVersion implements Command {
+
+    @Override
+    public void execute() {
+        Log.info("Version: %s", BuildConfig.LIMBO_VERSION);
+    }
+
+    @Override
+    public String description() {
+        return "Display limbo version";
+    }
+}

src/main/java/ua/nanit/limbo/server/data/BossBar.java

@@ -15,24 +15,26 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server.data;
+package ua.nanit.limbo.server.data;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;
 import org.spongepowered.configurate.serialize.SerializationException;
 import org.spongepowered.configurate.serialize.TypeSerializer;
-import ru.nanit.limbo.util.Colors;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.util.Colors;
+import ua.nanit.limbo.util.NbtMessageUtil;
 
 import java.lang.reflect.Type;
 
 public class BossBar {
 
-    private String text;
+    private NbtMessage text;
     private float health;
     private Color color;
     private Division division;
 
-    public String getText() {
+    public NbtMessage getText() {
         return text;
     }
 
@@ -48,7 +50,7 @@ public class BossBar {
         return division;
     }
 
-    public void setText(String text) {
+    public void setText(NbtMessage text) {
         this.text = text;
     }
 
@@ -110,7 +112,7 @@ public class BossBar {
         public BossBar deserialize(Type type, ConfigurationNode node) throws SerializationException {
             BossBar bossBar = new BossBar();
 
-            bossBar.setText(Colors.of(node.node("text").getString("")));
+            bossBar.setText(NbtMessageUtil.create(Colors.of(node.node("text").getString(""))));
             bossBar.setHealth(node.node("health").getFloat());
 
             if (bossBar.getHealth() < 0 || bossBar.getHealth() > 1)

src/main/java/ua/nanit/limbo/server/data/InfoForwarding.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server.data;
+package ua.nanit.limbo.server.data;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;

src/main/java/ua/nanit/limbo/server/data/PingData.java

@@ -15,12 +15,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server.data;
+package ua.nanit.limbo.server.data;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;
 import org.spongepowered.configurate.serialize.TypeSerializer;
-import ru.nanit.limbo.util.Colors;
+import ua.nanit.limbo.util.Colors;
 
 import java.lang.reflect.Type;
 
@@ -28,6 +28,7 @@ public class PingData {
 
     private String version;
     private String description;
+    private int protocol;
 
     public String getVersion() {
         return version;
@@ -45,6 +46,14 @@ public class PingData {
         this.description = description;
     }
 
+    public int getProtocol() {
+        return protocol;
+    }
+
+    public void setProtocol(int protocol) {
+        this.protocol = protocol;
+    }
+
     public static class Serializer implements TypeSerializer<PingData> {
 
         @Override
@@ -52,6 +61,7 @@ public class PingData {
             PingData pingData = new PingData();
             pingData.setDescription(Colors.of(node.node("description").getString("")));
             pingData.setVersion(Colors.of(node.node("version").getString("")));
+            pingData.setProtocol(node.node("protocol").getInt(-1));
             return pingData;
         }
 

src/main/java/ua/nanit/limbo/server/data/Title.java

@@ -15,28 +15,30 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.server.data;
+package ua.nanit.limbo.server.data;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;
 import org.spongepowered.configurate.serialize.TypeSerializer;
-import ru.nanit.limbo.util.Colors;
+import ua.nanit.limbo.protocol.NbtMessage;
+import ua.nanit.limbo.util.Colors;
+import ua.nanit.limbo.util.NbtMessageUtil;
 
 import java.lang.reflect.Type;
 
 public class Title {
 
-    private String title;
-    private String subtitle;
+    private NbtMessage title;
+    private NbtMessage subtitle;
     private int fadeIn;
     private int stay;
     private int fadeOut;
 
-    public String getTitle() {
+    public NbtMessage getTitle() {
         return title;
     }
 
-    public String getSubtitle() {
+    public NbtMessage getSubtitle() {
         return subtitle;
     }
 
@@ -52,11 +54,11 @@ public class Title {
         return fadeOut;
     }
 
-    public void setTitle(String title) {
+    public void setTitle(NbtMessage title) {
         this.title = title;
     }
 
-    public void setSubtitle(String subtitle) {
+    public void setSubtitle(NbtMessage subtitle) {
         this.subtitle = subtitle;
     }
 
@@ -77,8 +79,8 @@ public class Title {
         @Override
         public Title deserialize(Type type, ConfigurationNode node) {
             Title title = new Title();
-            title.setTitle(Colors.of(node.node("title").getString("")));
-            title.setSubtitle(Colors.of(node.node("subtitle").getString("")));
+            title.setTitle(NbtMessageUtil.create(Colors.of(node.node("title").getString(""))));
+            title.setSubtitle(NbtMessageUtil.create(Colors.of(node.node("subtitle").getString(""))));
             title.setFadeIn(node.node("fadeIn").getInt(10));
             title.setStay(node.node("stay").getInt(100));
             title.setFadeOut(node.node("fadeOut").getInt(10));

src/main/java/ua/nanit/limbo/util/Colors.java

@@ -15,14 +15,15 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.util;
+package ua.nanit.limbo.util;
 
 public final class Colors {
 
-    private static final char CHAR_FROM = '\u0026';
-    private static final char CHAR_TO = '\u00A7';
+    private static final char CHAR_FROM = '&';
+    private static final char CHAR_TO = '\u00a7';
 
-    private Colors() {}
+    private Colors() {
+    }
 
     public static String of(String text) {
         if (text == null) return null;

src/main/java/ua/nanit/limbo/util/NbtMessageUtil.java

@@ -0,0 +1,110 @@
+package ua.nanit.limbo.util;
+
+import com.google.gson.*;
+import net.kyori.adventure.nbt.*;
+import ua.nanit.limbo.protocol.NbtMessage;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class NbtMessageUtil {
+
+    public static NbtMessage create(String json) {
+        BinaryTag compoundBinaryTag = fromJson(JsonParser.parseString(json));
+
+        return new NbtMessage(json, compoundBinaryTag);
+    }
+
+    public static BinaryTag fromJson(JsonElement json) {
+        if (json instanceof JsonPrimitive) {
+            JsonPrimitive jsonPrimitive = (JsonPrimitive) json;
+            if (jsonPrimitive.isNumber()) {
+                Number number = json.getAsNumber();
+
+                if (number instanceof Byte) {
+                    return ByteBinaryTag.byteBinaryTag((Byte) number);
+                } else if (number instanceof Short) {
+                    return ShortBinaryTag.shortBinaryTag((Short) number);
+                } else if (number instanceof Integer) {
+                    return IntBinaryTag.intBinaryTag((Integer) number);
+                } else if (number instanceof Long) {
+                    return LongBinaryTag.longBinaryTag((Long) number);
+                } else if (number instanceof Float) {
+                    return FloatBinaryTag.floatBinaryTag((Float) number);
+                } else if (number instanceof Double) {
+                    return DoubleBinaryTag.doubleBinaryTag((Double) number);
+                }
+            } else if (jsonPrimitive.isString()) {
+                return StringBinaryTag.stringBinaryTag(jsonPrimitive.getAsString());
+            } else if (jsonPrimitive.isBoolean()) {
+                return ByteBinaryTag.byteBinaryTag(jsonPrimitive.getAsBoolean() ? (byte) 1 : (byte) 0);
+            } else {
+                throw new IllegalArgumentException("Unknown JSON primitive: " + jsonPrimitive);
+            }
+        } else if (json instanceof JsonObject) {
+            CompoundBinaryTag.Builder builder = CompoundBinaryTag.builder();
+            for (Map.Entry<String, JsonElement> property : ((JsonObject) json).entrySet()) {
+                builder.put(property.getKey(), fromJson(property.getValue()));
+            }
+
+            return builder.build();
+        } else if (json instanceof JsonArray) {
+            List<JsonElement> jsonArray = ((JsonArray) json).asList();
+
+            if (jsonArray.isEmpty()) {
+                return ListBinaryTag.listBinaryTag(EndBinaryTag.endBinaryTag().type(), Collections.emptyList());
+            }
+
+            BinaryTagType tagByteType = ByteBinaryTag.ZERO.type();
+            BinaryTagType tagIntType = IntBinaryTag.intBinaryTag(0).type();
+            BinaryTagType tagLongType = LongBinaryTag.longBinaryTag(0).type();
+
+            BinaryTag listTag;
+            BinaryTagType listType = fromJson(jsonArray.get(0)).type();
+            if (listType.equals(tagByteType)) {
+                byte[] bytes = new byte[jsonArray.size()];
+                for (int i = 0; i < bytes.length; i++) {
+                    bytes[i] = (Byte) ((JsonPrimitive) jsonArray.get(i)).getAsNumber();
+                }
+
+                listTag = ByteArrayBinaryTag.byteArrayBinaryTag(bytes);
+            } else if (listType.equals(tagIntType)) {
+                int[] ints = new int[jsonArray.size()];
+                for (int i = 0; i < ints.length; i++) {
+                    ints[i] = (Integer) ((JsonPrimitive) jsonArray.get(i)).getAsNumber();
+                }
+
+                listTag = IntArrayBinaryTag.intArrayBinaryTag(ints);
+            } else if (listType.equals(tagLongType)) {
+                long[] longs = new long[jsonArray.size()];
+                for (int i = 0; i < longs.length; i++) {
+                    longs[i] = (Long) ((JsonPrimitive) jsonArray.get(i)).getAsNumber();
+                }
+
+                listTag = LongArrayBinaryTag.longArrayBinaryTag(longs);
+            } else {
+                List<BinaryTag> tagItems = new ArrayList<>(jsonArray.size());
+
+                for (JsonElement jsonEl : jsonArray) {
+                    BinaryTag subTag = fromJson(jsonEl);
+                    if (subTag.type() != listType) {
+                        throw new IllegalArgumentException("Cannot convert mixed JsonArray to Tag");
+                    }
+
+                    tagItems.add(subTag);
+                }
+
+                listTag = ListBinaryTag.listBinaryTag(listType, tagItems);
+            }
+
+            return listTag;
+        } else if (json instanceof JsonNull) {
+            return EndBinaryTag.endBinaryTag();
+        }
+
+        throw new IllegalArgumentException("Unknown JSON element: " + json);
+    }
+
+}

src/main/java/ua/nanit/limbo/util/UuidUtil.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.util;
+package ua.nanit.limbo.util;
 
 import java.nio.charset.StandardCharsets;
 import java.util.UUID;

src/main/java/ua/nanit/limbo/world/Dimension.java

@@ -15,7 +15,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package ru.nanit.limbo.world.dimension;
+package ua.nanit.limbo.world;
 
 import net.kyori.adventure.nbt.CompoundBinaryTag;
 

src/main/java/ua/nanit/limbo/world/DimensionRegistry.java

@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ua.nanit.limbo.world;
+
+import net.kyori.adventure.nbt.CompoundBinaryTag;
+import net.kyori.adventure.nbt.ListBinaryTag;
+import net.kyori.adventure.nbt.TagStringIO;
+import ua.nanit.limbo.server.LimboServer;
+import ua.nanit.limbo.server.Log;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.stream.Collectors;
+
+public final class DimensionRegistry {
+
+    private final LimboServer server;
+
+    private Dimension defaultDimension_1_16;
+    private Dimension defaultDimension_1_18_2;
+    private Dimension dimension_1_20_5;
+    private Dimension dimension_1_21;
+
+    private CompoundBinaryTag codec_1_16;
+    private CompoundBinaryTag codec_1_18_2;
+    private CompoundBinaryTag codec_1_19;
+    private CompoundBinaryTag codec_1_19_1;
+    private CompoundBinaryTag codec_1_19_4;
+    private CompoundBinaryTag codec_1_20;
+    private CompoundBinaryTag codec_1_21;
+    private CompoundBinaryTag oldCodec;
+
+    public DimensionRegistry(LimboServer server) {
+        this.server = server;
+    }
+
+    public CompoundBinaryTag getCodec_1_16() {
+        return codec_1_16;
+    }
+
+    public CompoundBinaryTag getCodec_1_18_2() {
+        return codec_1_18_2;
+    }
+
+    public CompoundBinaryTag getCodec_1_19() {
+        return codec_1_19;
+    }
+
+    public CompoundBinaryTag getCodec_1_19_1() {
+        return codec_1_19_1;
+    }
+
+    public CompoundBinaryTag getCodec_1_19_4() {
+        return codec_1_19_4;
+    }
+
+    public CompoundBinaryTag getCodec_1_20() {
+        return codec_1_20;
+    }
+
+    public CompoundBinaryTag getCodec_1_21() {
+        return codec_1_21;
+    }
+
+    public CompoundBinaryTag getOldCodec() {
+        return oldCodec;
+    }
+
+    public Dimension getDefaultDimension_1_16() {
+        return defaultDimension_1_16;
+    }
+
+    public Dimension getDefaultDimension_1_18_2() {
+        return defaultDimension_1_18_2;
+    }
+
+    public Dimension getDimension_1_20_5() {
+        return dimension_1_20_5;
+    }
+
+    public Dimension getDimension_1_21() {
+        return dimension_1_21;
+    }
+
+    public void load(String def) throws IOException {
+        // On 1.16-1.16.1 different codec format
+        oldCodec = readCodecFile("/dimension/codec_old.snbt");
+        codec_1_16 = readCodecFile("/dimension/codec_1_16.snbt");
+        codec_1_18_2 = readCodecFile("/dimension/codec_1_18_2.snbt");
+        codec_1_19 = readCodecFile("/dimension/codec_1_19.snbt");
+        codec_1_19_1 = readCodecFile("/dimension/codec_1_19_1.snbt");
+        codec_1_19_4 = readCodecFile("/dimension/codec_1_19_4.snbt");
+        codec_1_20 = readCodecFile("/dimension/codec_1_20.snbt");
+        codec_1_21 = readCodecFile("/dimension/codec_1_21.snbt");
+
+        defaultDimension_1_16 = getDefaultDimension(def, codec_1_16);
+        defaultDimension_1_18_2 = getDefaultDimension(def, codec_1_18_2);
+
+        dimension_1_20_5 = getModernDimension(def, codec_1_20);
+        dimension_1_21 = getModernDimension(def, codec_1_21);
+    }
+
+    private Dimension getDefaultDimension(String def, CompoundBinaryTag tag) {
+        ListBinaryTag dimensions = tag.getCompound("minecraft:dimension_type").getList("value");
+
+        CompoundBinaryTag overWorld = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(0)).get("element");
+        CompoundBinaryTag nether = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(2)).get("element");
+        CompoundBinaryTag theEnd = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(3)).get("element");
+
+        switch (def.toLowerCase()) {
+            case "overworld":
+                return new Dimension(0, "minecraft:overworld", overWorld);
+            case "the_nether":
+                return new Dimension(-1, "minecraft:nether", nether);
+            case "the_end":
+                return new Dimension(1, "minecraft:the_end", theEnd);
+            default:
+                Log.warning("Undefined dimension type: '%s'. Using THE_END as default", def);
+                return new Dimension(1, "minecraft:the_end", theEnd);
+        }
+    }
+
+    private Dimension getModernDimension(String def, CompoundBinaryTag tag) {
+        switch (def.toLowerCase()) {
+            case "overworld":
+                return new Dimension(0, "minecraft:overworld", tag);
+            case "the_nether":
+                return new Dimension(2, "minecraft:nether", tag);
+            case "the_end":
+                return new Dimension(3, "minecraft:the_end", tag);
+            default:
+                Log.warning("Undefined dimension type: '%s'. Using THE_END as default", def);
+                return new Dimension(3, "minecraft:the_end", tag);
+        }
+    }
+
+    private CompoundBinaryTag readCodecFile(String resPath) throws IOException {
+        InputStream in = server.getClass().getResourceAsStream(resPath);
+
+        if (in == null)
+            throw new FileNotFoundException("Cannot find dimension registry file");
+
+        return TagStringIO.get().asCompound(streamToString(in));
+    }
+
+    private String streamToString(InputStream in) throws IOException {
+        try (BufferedReader bufReader = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8))) {
+            return bufReader.lines().collect(Collectors.joining("\n"));
+        }
+    }
+}

src/main/resources/logback.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration>
+
+<configuration>
+    <import class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"/>
+    <import class="ch.qos.logback.core.ConsoleAppender"/>
+    <import class="ch.qos.logback.core.FileAppender"/>
+
+    <timestamp key="bySecond" datePattern="yyyy-MM-dd"/>
+
+    <appender name="STDOUT" class="ConsoleAppender">
+        <encoder class="PatternLayoutEncoder">
+            <pattern>%d{HH:mm:ss.SSS} %-5level %logger{36} -%kvp- %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="FILE" class="FileAppender">
+        <file>logs/log-${bySecond}.txt</file>
+        <immediateFlush>true</immediateFlush>
+
+        <encoder class="PatternLayoutEncoder">
+            <pattern>%d{HH:mm:ss.SSS} %-5level %logger{36} -%kvp- %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info">
+        <appender-ref ref="FILE"/>
+        <appender-ref ref="STDOUT"/>
+    </root>
+</configuration>

src/main/resources/settings.yml

@@ -7,7 +7,7 @@ bind:
   ip: 'localhost'
   port: 65535
 
-# Max amount of players can join to server
+# Max number of players can join to server
 # Set -1 to make it infinite
 maxPlayers: 100
 
@@ -15,49 +15,48 @@ maxPlayers: 100
 ping:
   description: '{"text": "&9NanoLimbo"}'
   version: 'NanoLimbo'
+  # Return static protocol version number in ping result
+  # By default, its -1 to return the client version if it supported
+  # https://wiki.vg/Protocol_version_numbers
+  protocol: -1
 
 # Available dimensions: OVERWORLD, NETHER, THE_END
 dimension: THE_END
 
 # Whether to display the player in the player list
-# For 1.16.5 clients player list will be sent even if disabled, to avoid crash
+# For 1.16.5 clients, the player list will be sent even if disabled, to avoid crash
 playerList:
   enable: false
   username: 'NanoLimbo'
 
 # Whether to display header and footer in player list
+# For 1.8+ clients
 headerAndFooter:
   enable: false
   header: '{"text": "&eWelcome!"}'
   footer: '{"text": "&9NanoLimbo"}'
 
-# Spawn position in the world
-spawnPosition:
-  x: 0.0
-  y: 64.0
-  z: 0.0
-  yaw: 0.0
-  pitch: 0.0
-
 # Setup player's game mode
 # 0 - Survival
 # 1 - Creative (hide HP and food bar)
 # 2 - Adventure
 # 3 - Spectator (hide all UI bars)
+# Spectator works on 1.8+ clients
 gameMode: 3
 
 # Server name which is shown under F3
+# For 1.13+ clients
 brandName:
   enable: true
   content: 'NanoLimbo'
 
-# Message sends when player join to server
+# Message sends when player joins to the server
 joinMessage:
   enable: true
   text: '{"text": "&eWelcome to the Limbo!"}'
 
-# BossBar displays when player join to server
-# Works on 1.9+ clients only
+# BossBar displays when player joins to the server
+# For 1.9+ clients
 bossBar:
   enable: true
   text: '{"text": "Welcome to the Limbo!"}'
@@ -68,6 +67,7 @@ bossBar:
   division: SOLID
 
 # Display title and subtitle
+# For 1.8+ clients
 title:
   enable: true
   # Set title text value empty, if you need only subtitle
@@ -87,7 +87,7 @@ title:
 #  - LEGACY
 #  - MODERN
 #  - BUNGEE_GUARD
-# Don't use secret if you not use MODERN type
+# Don't use secret if you do not use MODERN type
 infoForwarding:
   type: NONE
   secret: '<YOUR_SECRET_HERE>'
@@ -105,11 +105,29 @@ readTimeout: 30000
 # 3 - Display errors, warnings, info, debug
 debugLevel: 2
 
-# Warning! Do not touch params of this block, if you not completely sure what is this!
+# Warning! Do not touch params of this block if you are not completely sure what is this!
 netty:
-  # Use Linux native transport type, if it possible
+  # Use a Linux native transport type, if it possible
   useEpoll: true
   # EventLoopGroup threads count
   threads:
     bossGroup: 1
     workerGroup: 4
+
+# Options to check incoming traffic and kick potentially malicious connections.
+# Take into account that player can send many small packets, for example, just moving mouse.
+traffic:
+  # If true, then additional handler will be added to the channel pipeline
+  enable: true
+  # Max packet size in bytes
+  # Unlimited if -1
+  maxPacketSize: 8192
+  # The interval to measure packets over
+  # Lowering this value will limit peak packets from players which would target people with bad connections
+  # Raising this value will allow higher peak packet rates, which will help with people who have poor connections
+  # Ignored if -1.0
+  interval: 7.0
+  # The maximum packets per second for players
+  # It is measured over the configured interval
+  # Ignored if -1.0
+  maxPacketRate: 500.0