1.7.8 release

* Official 1.16.4 support
ClientVersion.v_1_16_4, ServerVersion.v_1_16_4 created
* Unfortunately PacketEvents.getSettings().useProtocolLibIfAvailable(boolean) setting most likely won't be coming back
* Bungee client version resolving bug fixed
* Recommended to have ViaVersion, ProtocolSupport or ProtocolLib on your spigot server, as PacketEvents makes use of them to resolve client version ONLY if they are available.
They are required on the spigot server ONLY if you have a bungee network.
* Interruption of PacketEvents.stop() protected

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>io.github.retrooper</groupId>
     <artifactId>packetevents</artifactId>
-    <version>1.7.6</version>
+    <version>1.7.8</version>
 
     <!-- You can build the project with this: "mvn clean compile assembly:single" -->
     <build>
@@ -122,6 +122,20 @@
             <version>4.5.0</version>
             <scope>provided</scope>
         </dependency>
+
+        <dependency>
+            <groupId>us.myles</groupId>
+            <artifactId>viaversion</artifactId>
+            <version>3.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.ProtocolSupport</groupId>
+            <artifactId>ProtocolSupport</artifactId>
+            <version>3d24efeda6</version>
+        </dependency>
+
         <dependency>
             <groupId>org.spigotmc</groupId>
             <artifactId>spigot-api</artifactId>

src/main/java/io/github/retrooper/packetevents/PacketEvents.java

@@ -37,7 +37,8 @@ import io.github.retrooper.packetevents.utils.nms.NMSUtils;
 import io.github.retrooper.packetevents.utils.player.ClientVersion;
 import io.github.retrooper.packetevents.utils.server.PEVersion;
 import io.github.retrooper.packetevents.utils.server.ServerVersion;
-import io.github.retrooper.packetevents.utils.v_1_7_10.ProtocolVersionAccessor_v_1_7;
+import io.github.retrooper.packetevents.utils.versionlookup.VersionLookupUtils;
+import io.github.retrooper.packetevents.utils.versionlookup.v_1_7_10.ProtocolVersionAccessor_v_1_7;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -57,9 +58,8 @@ public final class PacketEvents implements Listener {
     private static final PacketEventsAPI packetEventsAPI = new PacketEventsAPI();
     private static final PacketEvents instance = new PacketEvents();
     private static final ArrayList<Plugin> plugins = new ArrayList<>(1);
-    private static boolean loaded, initialized;
-    private static final PEVersion version = new PEVersion(1, 7, 6);
-
+    private static boolean loading, loaded, initialized, initializing, uninitializing;
+    private static final PEVersion version = new PEVersion(1, 7, 8);
     private static PacketEventsSettings settings = new PacketEventsSettings();
     /**
      * General executor service, basically for anything that the packet executor service doesn't do.
@@ -88,7 +88,8 @@ public final class PacketEvents implements Listener {
      * All PacketEvents' wrappers are setup and do all loading they need to do.
      */
     public static void load() {
-        if (!loaded) {
+        if (!loaded && !loading) {
+            loading = true;
             ServerVersion version = ServerVersion.getVersion();
             WrappedPacket.version = version;
             PacketEvent.version = version;
@@ -107,9 +108,11 @@ public final class PacketEvents implements Listener {
 
                 WrappedPacket.loadAllWrappers();
             } catch (Exception ex) {
+                loading = false;
                 throw new PacketEventsLoadFailureException();
             }
             loaded = true;
+            loading = false;
         }
 
     }
@@ -135,14 +138,14 @@ public final class PacketEvents implements Listener {
      */
     public static void init(final Plugin pl, PacketEventsSettings packetEventsSettings) {
         load();
-        if (!initialized) {
+        if (!initialized && !initializing) {
+            initializing = true;
             settings = packetEventsSettings;
             int packetHandlingThreadCount = settings.getPacketHandlingThreadCount();
             //if the count is 1 or is invalid
-            if(packetHandlingThreadCount == 1 || packetHandlingThreadCount < 0) {
+            if (packetHandlingThreadCount == 1 || packetHandlingThreadCount < 0) {
                 packetHandlingExecutorService = Executors.newSingleThreadExecutor();
-            }
-            else {
+            } else {
                 packetHandlingExecutorService = Executors.newFixedThreadPool(packetHandlingThreadCount);
             }
             plugins.add(pl);
@@ -152,11 +155,17 @@ public final class PacketEvents implements Listener {
             PacketEvents.getAPI().packetManager = new PacketManager(plugins.get(0), settings.shouldInjectEarly());
 
             for (final Player p : Bukkit.getOnlinePlayers()) {
-                getAPI().getPlayerUtils().injectPlayer(p);
+                try {
+                    getAPI().getPlayerUtils().injectPlayer(p);
+                } catch (Exception ex) {
+                    p.kickPlayer("Failed to inject you, please rejoin the server!");
+                }
             }
 
             if (settings.shouldCheckForUpdates()) {
-               PacketEvents.generalExecutorService.execute(() -> new UpdateChecker().handleUpdate());
+                Future<?> future =
+                        PacketEvents.generalExecutorService
+                                .submit(() -> new UpdateChecker().handleUpdate());
             }
 
             if (getAPI().getServerUtils().isBungeeCordEnabled()) {
@@ -165,6 +174,7 @@ public final class PacketEvents implements Listener {
             }
 
             initialized = true;
+            initializing = false;
         }
     }
 
@@ -172,7 +182,8 @@ public final class PacketEvents implements Listener {
      *
      */
     public static void stop() {
-        if (initialized) {
+        if (initialized && !uninitializing) {
+            uninitializing = true;
             for (Player player : Bukkit.getOnlinePlayers()) {
                 PacketEvents.getAPI().packetManager.ejectPlayer(player);
             }
@@ -184,6 +195,7 @@ public final class PacketEvents implements Listener {
             PacketEvents.generalExecutorService.shutdownNow();
             PacketEvents.packetHandlingExecutorService.shutdownNow();
             initialized = false;
+            uninitializing = true;
         }
     }
 
@@ -221,9 +233,7 @@ public final class PacketEvents implements Listener {
         if (PacketEvents.getSettings().shouldInjectEarly()) {
             assert getAPI().packetManager.tinyProtocol != null;
             try {
-                if (getAPI().packetManager.canInject(e.getPlayer())) {
-                    getAPI().packetManager.injectPlayer(e.getPlayer());
-                }
+                getAPI().packetManager.injectPlayer(e.getPlayer());
             } catch (Exception ex) {
                 e.disallow(PlayerLoginEvent.Result.KICK_OTHER, "We are unable to inject you. Please try again!");
             }
@@ -232,15 +242,21 @@ public final class PacketEvents implements Listener {
 
     @EventHandler(priority = EventPriority.LOW)
     public void onJoin(final PlayerJoinEvent e) {
-        if(PacketEvents.getAPI().getServerUtils().getVersion() == ServerVersion.v_1_7_10) {
-            Object channel = NMSUtils.getChannel(e.getPlayer());
+        Object channel = NMSUtils.getChannel(e.getPlayer());
+        if (PacketEvents.getAPI().getServerUtils().getVersion() == ServerVersion.v_1_7_10) {
             ClientVersion version = ClientVersion.getClientVersion(ProtocolVersionAccessor_v_1_7.getProtocolVersion(e.getPlayer()));
             PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.put(channel, version);
+        } else if (VersionLookupUtils.isDependencyAvailable()) {
+            int protocolVersion = VersionLookupUtils.getProtocolVersion(e.getPlayer());
+            ClientVersion version = ClientVersion.getClientVersion(protocolVersion);
+            PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.put(channel, version);
         }
         //Waiting for the BungeeCord server to send their plugin message with your version,
         if (!PacketEvents.getSettings().shouldInjectEarly()) {
-            if (getAPI().packetManager.canInject(e.getPlayer())) {
+            try {
                 PacketEvents.getAPI().packetManager.injectPlayer(e.getPlayer());
+            } catch (Exception ex) {
+                e.getPlayer().kickPlayer("There was an issue injecting you. Please try again!");
             }
         }
     }
@@ -248,6 +264,7 @@ public final class PacketEvents implements Listener {
 
     @EventHandler(priority = EventPriority.HIGHEST)
     public void onQuit(final PlayerQuitEvent e) {
-        PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.remove(e.getPlayer().getUniqueId());
+        Object channel = NMSUtils.getChannelNoCache(e.getPlayer());
+        PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.remove(channel);
     }
-}
+}

src/main/java/io/github/retrooper/packetevents/example/MainExample.java

@@ -25,6 +25,12 @@
 package io.github.retrooper.packetevents.example;
 
 import io.github.retrooper.packetevents.PacketEvents;
+import io.github.retrooper.packetevents.event.PacketListenerDynamic;
+import io.github.retrooper.packetevents.event.impl.PacketReceiveEvent;
+import io.github.retrooper.packetevents.event.priority.PacketEventPriority;
+import io.github.retrooper.packetevents.packettype.PacketType;
+import io.github.retrooper.packetevents.packetwrappers.in.chat.WrappedPacketInChat;
+import io.github.retrooper.packetevents.utils.player.ClientVersion;
 import io.github.retrooper.packetevents.utils.server.ServerVersion;
 import org.bukkit.plugin.java.JavaPlugin;
 

src/main/java/io/github/retrooper/packetevents/exceptions/PacketEventsNMSCachedEntityNotFoundException.java

@@ -30,6 +30,6 @@ public class PacketEventsNMSCachedEntityNotFoundException extends RuntimeExcepti
     }
 
     public PacketEventsNMSCachedEntityNotFoundException(int entityID) {
-        this("PacketEvents failed to find an entity with ID " + entityID + " in NMS' entity cache map!");
+        this("PacketEvents failed to find an entity with ID " + entityID + "!");
     }
 }

src/main/java/io/github/retrooper/packetevents/packetmanager/PacketManager.java

@@ -41,9 +41,6 @@ import java.util.UUID;
 import java.util.concurrent.atomic.AtomicInteger;
 
 public class PacketManager {
-
-    private static final AtomicInteger handlerID = new AtomicInteger();
-    private final int handlerNumber = handlerID.getAndIncrement();
     private final Plugin plugin;
     private final boolean tinyProtocolMode;
     public final TinyProtocol tinyProtocol;
@@ -57,8 +54,8 @@ public class PacketManager {
             tinyProtocol = new TinyProtocol(plugin);
             nettyProtocol = null;
         } else {
-            tinyProtocol = null;
             nettyProtocol = new NettyPacketManager(plugin);
+            tinyProtocol = null;
         }
     }
 
@@ -95,8 +92,10 @@ public class PacketManager {
         PacketEvents.getAPI().getEventManager().callEvent(injectEvent);
         if (!injectEvent.isCancelled()) {
             if (tinyProtocolMode) {
+                assert tinyProtocol != null;
                 tinyProtocol.injectPlayerAsync(player);
             } else {
+                assert nettyProtocol != null;
                 nettyProtocol.injectPlayerAsync(player);
             }
         }
@@ -160,12 +159,8 @@ public class PacketManager {
         }
     }
 
-    public boolean canInject(Player player) {
-       return true;
-    }
-
     public String getNettyHandlerName() {
-        return "pe-" + plugin.getName() + "-" + handlerNumber;
+        return "pe-" + plugin.getName();
     }
 
     public Object read(Player player, Object channel, Object packet) {
@@ -280,12 +275,13 @@ public class PacketManager {
     }
 
     private void interceptLogin(PacketLoginEvent event) {
-        if (event.getPacketId() == PacketType.Login.HANDSHAKE &&
-        PacketEvents.getAPI().getServerUtils().getVersion() != ServerVersion.v_1_7_10) {
-                WrappedPacketLoginHandshake handshake = new WrappedPacketLoginHandshake(event.getNMSPacket());
-                int protocolVersion = handshake.getProtocolVersion();
-                ClientVersion version = ClientVersion.getClientVersion(protocolVersion);
-                PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.put(event.getChannel(), version);
+        if (event.getPacketId() == PacketType.Login.HANDSHAKE
+                && PacketEvents.getAPI().getServerUtils().getVersion() != ServerVersion.v_1_7_10
+                && !PacketEvents.getAPI().getServerUtils().isBungeeCordEnabled()) {
+            WrappedPacketLoginHandshake handshake = new WrappedPacketLoginHandshake(event.getNMSPacket());
+            int protocolVersion = handshake.getProtocolVersion();
+            ClientVersion version = ClientVersion.getClientVersion(protocolVersion);
+            PacketEvents.getAPI().getPlayerUtils().clientVersionsMap.put(event.getChannel(), version);
         }
     }
 

src/main/java/io/github/retrooper/packetevents/packetwrappers/in/useentity/WrappedPacketInUseEntity.java

@@ -38,11 +38,7 @@ public final class WrappedPacketInUseEntity extends WrappedPacket {
     }
 
     public static void load() {
-        //System.out.println("USE ENTITY HAS BEEN LOADED BROOOIOII");
         Class<?> useEntityClass = NMSUtils.getNMSClassWithoutException("PacketPlayInUseEntity");
-        /*if(useEntityClass == null) {
-            System.out.println("failed to init use entity wtfffff");
-        }*/
         try {
             enumEntityUseActionClass = NMSUtils.getNMSClass("EnumEntityUseAction");
         } catch (ClassNotFoundException e) {

src/main/java/io/github/retrooper/packetevents/packetwrappers/out/chat/WrappedPacketOutChat.java

@@ -79,7 +79,7 @@ public final class WrappedPacketOutChat extends WrappedPacket implements Sendabl
 
     public WrappedPacketOutChat(String message, ChatPosition chatPosition, UUID uuid) {
         this.uuid = uuid;
-        this.message = message;
+        this.message = fromStringToJSON(message);
         this.chatPosition = chatPosition;
     }
 

src/main/java/io/github/retrooper/packetevents/settings/PacketEventsSettings.java

@@ -25,7 +25,6 @@
 package io.github.retrooper.packetevents.settings;
 
 import io.github.retrooper.packetevents.utils.server.ServerVersion;
-import net.minecraft.server.v1_8_R3.Packet;
 
 public class PacketEventsSettings {
     private ServerVersion backupServerVersion = ServerVersion.v_1_7_10;

src/main/java/io/github/retrooper/packetevents/utils/entityfinder/EntityFinderUtils.java

@@ -40,10 +40,8 @@ public final class EntityFinderUtils {
     public static ServerVersion version;
     private static Class<?> worldServerClass;
     private static Class<?> craftWorldClass;
-    private static Class<?> entityClass;
     private static Method getEntityByIdMethod;
     private static Method craftWorldGetHandle;
-    private static Method getBukkitEntity;
 
     private static boolean isServerVersion_v_1_8_x;
 
@@ -52,15 +50,13 @@ public final class EntityFinderUtils {
         try {
             worldServerClass = NMSUtils.getNMSClass("WorldServer");
             craftWorldClass = NMSUtils.getOBCClass("CraftWorld");
-            entityClass = NMSUtils.getNMSClass("Entity");
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
 
         try {
-            getEntityByIdMethod = worldServerClass.getMethod(getEntityByIDMethodName(), int.class);
+            getEntityByIdMethod = worldServerClass.getMethod(isServerVersion_v_1_8_x ? "a" : "getEntity", int.class);
             craftWorldGetHandle = craftWorldClass.getMethod("getHandle");
-            getBukkitEntity = entityClass.getMethod("getBukkitEntity");
         } catch (NoSuchMethodException e) {
             e.printStackTrace();
         }
@@ -73,6 +69,14 @@ public final class EntityFinderUtils {
                 return entity;
             }
         }
+        //Entity has not been found in the NMS entity cache map...
+        for(World world : Bukkit.getWorlds()) {
+            for(Entity entity : world.getEntities()) {
+                if(entity.getEntityId() == id) {
+                    return NMSUtils.getNMSEntity(entity);
+                }
+            }
+        }
         throw new PacketEventsNMSCachedEntityNotFoundException(id);
     }
 
@@ -83,11 +87,19 @@ public final class EntityFinderUtils {
      * @return Entity
      */
     public static Entity getEntityById(final int id) {
-        Object nmsEntity = getNMSEntityById(id);
-        try {
-            return (Entity) getBukkitEntity.invoke(nmsEntity);
-        } catch (IllegalAccessException | InvocationTargetException e) {
-            e.printStackTrace();
+        for (final World world : Bukkit.getWorlds()) {
+            final Object entity = getNMSEntityByIdWithWorld(world, id);
+            if (entity != null) {
+                return NMSUtils.getBukkitEntity(entity);
+            }
+        }
+        //Entity has not been found in the NMS entity cache map...
+        for(World world : Bukkit.getWorlds()) {
+            for(Entity entity : world.getEntities()) {
+                if(entity.getEntityId() == id) {
+                    return entity;
+                }
+            }
         }
         throw new PacketEventsNMSCachedEntityNotFoundException(id);
     }
@@ -98,25 +110,19 @@ public final class EntityFinderUtils {
         } else if (craftWorldClass == null) {
             throw new IllegalStateException("PacketEvents failed to locate the CraftWorld class.");
         }
-        Object craftWorld = craftWorldClass.cast(world);
-
         Object worldServer = null;
         try {
-            worldServer = craftWorldGetHandle.invoke(craftWorld);
+            worldServer = craftWorldGetHandle.invoke(world);
         } catch (IllegalAccessException | InvocationTargetException e) {
             e.printStackTrace();
         }
 
-        Object nmsEntity = null;
         try {
-            nmsEntity = getEntityByIdMethod.invoke(worldServer, id);
+            return getEntityByIdMethod.invoke(worldServer, id);
         } catch (IllegalAccessException | InvocationTargetException e) {
             e.printStackTrace();
         }
-        if(nmsEntity == null) {
-            throw new PacketEventsNMSCachedEntityNotFoundException(id);
-        }
-        return nmsEntity;
+       return null;
     }
 
     /**
@@ -129,27 +135,6 @@ public final class EntityFinderUtils {
     @Nullable
     public static Entity getEntityByIdWithWorld(final World world, final int id) {
         Object nmsEntity = getNMSEntityByIdWithWorld(world, id);
-        if (nmsEntity == null) {
-            return null;
-        }
-        try {
-            return (Entity) getBukkitEntity.invoke(nmsEntity);
-        } catch (IllegalAccessException | InvocationTargetException e) {
-            e.printStackTrace();
-        }
-        throw new PacketEventsNMSCachedEntityNotFoundException(id);
-    }
-
-    /**
-     * This is the name of the method that returns the NMS entity when you pass in its ID.
-     * On 1.8-1.8.8 the function name is called 'a', on 1.7.10 and 1.9 and above the name is called 'getEntity'.
-     *
-     * @return entity by ID method name
-     */
-    public static String getEntityByIDMethodName() {
-        if (isServerVersion_v_1_8_x) {
-            return "a";
-        }
-        return "getEntity";
+        return NMSUtils.getBukkitEntity(nmsEntity);
     }
 }

src/main/java/io/github/retrooper/packetevents/utils/nms/NMSUtils.java

@@ -55,6 +55,7 @@ public final class NMSUtils {
     private static Method getCraftPlayerHandle;
     private static Method getCraftEntityHandle;
     private static Method asBukkitCopy;
+    private static Method getBukkitEntity;
     private static Field entityPlayerPingField, playerConnectionField;
 
     public static final HashMap<UUID, Object> channelCache = new HashMap<>();
@@ -102,6 +103,7 @@ public final class NMSUtils {
             getCraftEntityHandle = craftEntityClass.getMethod("getHandle");
             asBukkitCopy = craftItemStack.getMethod("asBukkitCopy", nmsItemStackClass);
             craftWorldGetHandle = craftWorldClass.getMethod("getHandle");
+            getBukkitEntity =  nmsEntityClass.getMethod("getBukkitEntity");
         } catch (NoSuchMethodException e) {
             e.printStackTrace();
         }
@@ -196,6 +198,15 @@ public final class NMSUtils {
         return null;
     }
 
+    public static Entity getBukkitEntity(final Object nmsEntity) {
+        try {
+            return (Entity) getBukkitEntity.invoke(nmsEntity);
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
     public static Object getCraftPlayer(final Player player) {
         return craftPlayerClass.cast(player);
     }

src/main/java/io/github/retrooper/packetevents/utils/player/ClientVersion.java

@@ -53,7 +53,8 @@ public enum ClientVersion {
     v_1_16_1(736),
     v_1_16_2(751),
     v_1_16_3(753),
-    HIGHER_THAN_SUPPORTED_VERSIONS(754),
+    v_1_16_4(754),
+    HIGHER_THAN_SUPPORTED_VERSIONS(755),
     /**
      * Pre releases just aren't supported, we would end up with so many enum constants.
      */
@@ -65,6 +66,7 @@ public enum ClientVersion {
 
     private static final int lowestSupportedProtocolVersion = 5;
     private static final int highestSupportedProtocolVersion = 753;
+
     ClientVersion(int protocolVersion) {
         this.protocolVersion = protocolVersion;
     }
@@ -94,24 +96,21 @@ public enum ClientVersion {
     }
 
     public static ClientVersion getClientVersion(int protocolVersion) {
-        if(protocolVersion == -1) {
-          return ClientVersion.UNRESOLVED;
+        if (protocolVersion == -1) {
+            return ClientVersion.UNRESOLVED;
         }
-        for(ClientVersion version : ClientVersion.values()) {
-            if(version.protocolVersion > protocolVersion) {
+        for (ClientVersion version : ClientVersion.values()) {
+            if (version.protocolVersion > protocolVersion) {
                 break;
-            }
-            else if(version.protocolVersion == protocolVersion) {
+            } else if (version.protocolVersion == protocolVersion) {
                 return version;
             }
         }
-        if(protocolVersion < lowestSupportedProtocolVersion) {
+        if (protocolVersion < lowestSupportedProtocolVersion) {
             return LOWER_THAN_SUPPORTED_VERSIONS;
-        }
-        else if(protocolVersion > highestSupportedProtocolVersion) {
+        } else if (protocolVersion > highestSupportedProtocolVersion) {
             return HIGHER_THAN_SUPPORTED_VERSIONS;
-        }
-        else if(protocolVersion > lowestSupportedProtocolVersion
+        } else if (protocolVersion > lowestSupportedProtocolVersion
                 && protocolVersion < highestSupportedProtocolVersion) {
             return ANY_PRE_RELEASE_VERSION;
         }

src/main/java/io/github/retrooper/packetevents/utils/server/ServerVersion.java

@@ -38,7 +38,7 @@ public enum ServerVersion {
 	v_1_11_2((short) 316), v_1_12((short) 335), v_1_12_1((short) 338), v_1_12_2((short) 340), v_1_13((short) 393),
 	v_1_13_1((short) 401), v_1_13_2((short) 404), v_1_14((short) 477), v_1_14_1((short) 480), v_1_14_2((short) 485),
 	v_1_14_3((short) 490), v_1_14_4((short) 498), v_1_15((short) 573), v_1_15_1((short) 575), v_1_15_2((short) 578),
-	v_1_16((short) 735), v_1_16_1((short) 736), v_1_16_2((short) 751), v_1_16_3((short) 753), ERROR((short) -1), EMPTY((short) -1);
+	v_1_16((short) 735), v_1_16_1((short) 736), v_1_16_2((short) 751), v_1_16_3((short) 753), v_1_16_4((short)754),ERROR((short) -1);
 
 	private static final String nmsVersionSuffix = Bukkit.getServer().getClass().getPackage().getName()
 			.replace(".", ",").split(",")[3];
@@ -58,6 +58,9 @@ public enum ServerVersion {
 		if (reversedValues[0] == null) {
 			reversedValues = ServerVersion.reverse(values());
 		}
+		if(reversedValues == null) {
+			throw new IllegalStateException("Failed to reverse the ServerVersion enum constant values.");
+		}
 		for (final ServerVersion val : reversedValues) {
 			String valName = val.name().substring(2).replace("_", ".");
 			if (Bukkit.getBukkitVersion().contains(valName)) {
@@ -125,7 +128,7 @@ public enum ServerVersion {
 	 * @return True if the supplied version is lower or equal, false if it is higher
 	 *         than the server's version.
 	 */
-	public boolean isAtLeast(final ServerVersion version) {
+	public boolean isHigherThanOrEquals(final ServerVersion version) {
 		return protocolId >= version.protocolId;
 	}
 
@@ -149,7 +152,7 @@ public enum ServerVersion {
 	 * @return True if the supplied version is higher or equal, false if it is lower
 	 *         than the server's version.
 	 */
-	public boolean isAtMost(final ServerVersion version) {
+	public boolean isLowerThanOrEquals(final ServerVersion version) {
 		return version.protocolId >= protocolId;
 	}
 }

src/main/java/io/github/retrooper/packetevents/utils/versionlookup/VersionLookupUtils.java

@@ -0,0 +1,48 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 retrooper
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package io.github.retrooper.packetevents.utils.versionlookup;
+
+import io.github.retrooper.packetevents.utils.versionlookup.protocollib.ProtocolLibVersionLookupUtils;
+import io.github.retrooper.packetevents.utils.versionlookup.protocolsupport.ProtocolSupportVersionLookupUtils;
+import io.github.retrooper.packetevents.utils.versionlookup.viaversion.ViaVersionLookupUtils;
+import org.bukkit.entity.Player;
+
+public class VersionLookupUtils {
+    public static boolean isDependencyAvailable() {
+        return ViaVersionLookupUtils.isAvailable() || ProtocolSupportVersionLookupUtils.isAvailable()
+                || ProtocolLibVersionLookupUtils.isAvailable();
+    }
+
+    public static int getProtocolVersion(Player player) {
+        if (ViaVersionLookupUtils.isAvailable()) {
+            return ViaVersionLookupUtils.getProtocolVersion(player);
+        } else if (ProtocolSupportVersionLookupUtils.isAvailable()) {
+            return ProtocolSupportVersionLookupUtils.getProtocolVersion(player);
+        } else if (ProtocolLibVersionLookupUtils.isAvailable()) {
+            return ProtocolLibVersionLookupUtils.getProtocolVersion(player);
+        }
+        return -1;
+    }
+}

src/main/java/io/github/retrooper/packetevents/utils/versionlookup/protocollib/ProtocolLibVersionLookupUtils.java

@@ -22,32 +22,18 @@
  * SOFTWARE.
  */
 
-package io.github.retrooper.packetevents.packetwrappers.out.blockchange;
+package io.github.retrooper.packetevents.utils.versionlookup.protocollib;
 
-import io.github.retrooper.packetevents.packetwrappers.WrappedPacket;
+import com.comphenix.protocol.ProtocolLibrary;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
 
-class WrappedPacketOutBlockChange extends WrappedPacket {
-    public WrappedPacketOutBlockChange(Object packet) {
-        super(packet);
+public class ProtocolLibVersionLookupUtils {
+    public static boolean isAvailable() {
+        return Bukkit.getPluginManager().isPluginEnabled("ProtocolLib");
     }
-//to-do load
-    @Override
-    protected void setup() {
-        //1.7 - int, int, int, Block, int data
-        //1.8+ - BlockPosition, IBlockData
 
-        //Constructors
-        //1.7 - int, int, int, World
-
-        //1.8->~1.12.2(World, BlockPosition)
-
-        //~1.13->~1.14(IBlockAccess, BlockPosition)
-        //1.16+(BlockPosition, IBlockData)
-        net.minecraft.server.v1_7_R4.PacketPlayOutBlockChange bc;
-        net.minecraft.server.v1_8_R3.PacketPlayOutBlockChange bc1;
-        net.minecraft.server.v1_9_R1.PacketPlayOutBlockChange bc2;
-        net.minecraft.server.v1_12_R1.PacketPlayOutBlockChange bc3;
-        net.minecraft.server.v1_13_R2.PacketPlayOutBlockChange bc4;
-        net.minecraft.server.v1_16_R2.PacketPlayOutBlockChange bc5;
+    public static int getProtocolVersion(Player player) {
+        return ProtocolLibrary.getProtocolManager().getProtocolVersion(player);
     }
 }

src/main/java/io/github/retrooper/packetevents/utils/versionlookup/protocolsupport/ProtocolSupportVersionLookupUtils.java

@@ -0,0 +1,39 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 retrooper
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package io.github.retrooper.packetevents.utils.versionlookup.protocolsupport;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import protocolsupport.api.ProtocolSupportAPI;
+
+public class ProtocolSupportVersionLookupUtils {
+    public static boolean isAvailable() {
+        return Bukkit.getPluginManager().isPluginEnabled("ProtocolSupport");
+    }
+    
+    public static int getProtocolVersion(Player player) {
+        return ProtocolSupportAPI.getProtocolVersion(player).getId();
+    }
+}

src/main/java/io/github/retrooper/packetevents/utils/versionlookup/v_1_7_10/ProtocolVersionAccessor_v_1_7.java

@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-package io.github.retrooper.packetevents.utils.v_1_7_10;
+package io.github.retrooper.packetevents.utils.versionlookup.v_1_7_10;
 
 import org.bukkit.entity.Player;
 

src/main/java/io/github/retrooper/packetevents/utils/versionlookup/viaversion/ViaVersionLookupUtils.java

@@ -0,0 +1,39 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 retrooper
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package io.github.retrooper.packetevents.utils.versionlookup.viaversion;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.api.Via;
+
+public class ViaVersionLookupUtils {
+    public static boolean isAvailable() {
+        return Bukkit.getPluginManager().isPluginEnabled("ViaVersion");
+    }
+
+    public static int getProtocolVersion(Player player) {
+        return Via.getAPI().getPlayerVersion(player.getUniqueId());
+    }
+}