Hitbox fix options

bukkit/src/main/java/us/myles/ViaVersion/bukkit/listeners/multiversion/PlayerSneakListener.java

@@ -0,0 +1,73 @@
+package us.myles.ViaVersion.bukkit.listeners.multiversion;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerToggleSneakEvent;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.protocol.ProtocolVersion;
+import us.myles.ViaVersion.bukkit.listeners.ViaBukkitListener;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public class PlayerSneakListener extends ViaBukkitListener {
+    private Method getHandle;
+    private Method setSize;
+    private boolean is1_9Fix;
+    private boolean is1_14Fix;
+
+    public PlayerSneakListener(ViaVersionPlugin plugin, boolean is1_9Fix, boolean is1_14Fix) {
+        super(plugin, null);
+        this.is1_9Fix = is1_9Fix;
+        this.is1_14Fix = is1_14Fix;
+        try {
+            getHandle = Class.forName(plugin.getServer().getClass().getPackage().getName() + ".entity.CraftPlayer").getMethod("getHandle");
+            setSize = Class.forName(plugin.getServer().getClass().getPackage().getName()
+                    .replace("org.bukkit.craftbukkit", "net.minecraft.server") + ".EntityPlayer").getMethod("setSize", Float.TYPE, Float.TYPE);
+        } catch (ClassNotFoundException | NoSuchMethodException e) {
+            e.printStackTrace();
+        }
+
+        getPlugin().getServer().getScheduler().runTaskTimer(getPlugin(), new Runnable() {
+            @Override
+            public void run() {
+                for (Player onlinePlayer : getPlugin().getServer().getOnlinePlayers()) {
+                    try {
+                        final Object handle = getHandle.invoke(onlinePlayer);
+                        final Class<?> aClass = Class.forName(getPlugin().getServer().getClass().getPackage().getName()
+                                .replace("org.bukkit.craftbukkit", "net.minecraft.server") + ".EntityPlayer");
+                        System.out.println(aClass.getField("length").get(handle));
+                    } catch (IllegalAccessException e) {
+                        e.printStackTrace();
+                    } catch (InvocationTargetException e) {
+                        e.printStackTrace();
+                    } catch (ClassNotFoundException e) {
+                        e.printStackTrace();
+                    } catch (NoSuchFieldException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }
+        }, 1, 1);
+    }
+
+    @EventHandler(ignoreCancelled = true)
+    public void playerToggleSneak(final PlayerToggleSneakEvent event) {
+        final Player player = event.getPlayer();
+        final int protocolVersion = getUserConnection(player).get(ProtocolInfo.class).getProtocolVersion();
+        if (is1_14Fix && protocolVersion >= ProtocolVersion.v1_14.getId()) {
+            setHight(player, event.isSneaking() ? 1.5F : 1.8F);
+        } else if (is1_9Fix && protocolVersion >= ProtocolVersion.v1_9.getId()) {
+            setHight(player, event.isSneaking() ? 1.6F : 1.8F);
+        }
+    }
+
+    private void setHight(Player player, float hight) {
+        try {
+            setSize.invoke(getHandle.invoke(player), 0.6F, hight);
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+}

bukkit/src/main/java/us/myles/ViaVersion/bukkit/platform/BukkitViaConfig.java

@@ -254,8 +254,19 @@ public class BukkitViaConfig extends Config implements ViaVersionConfig {
     public boolean isTruncate1_14Books() {
         return getBoolean("truncate-1_14-books", false);
     }
-    
+
+    @Override
     public boolean isLeftHandedHandling() {
         return getBoolean("left-handed-handling", true);
     }
+
+    @Override
+    public boolean is1_9HitboxFix() {
+        return getBoolean("change-1_9-hitbox", false);
+    }
+
+    @Override
+    public boolean is1_14HitboxFix() {
+        return getBoolean("change-1_14-hitbox", false);
+    }
 }

bukkit/src/main/java/us/myles/ViaVersion/bukkit/platform/BukkitViaLoader.java

@@ -15,6 +15,7 @@ import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
 import us.myles.ViaVersion.api.protocol.ProtocolVersion;
 import us.myles.ViaVersion.bukkit.classgenerator.ClassGenerator;
 import us.myles.ViaVersion.bukkit.listeners.UpdateListener;
+import us.myles.ViaVersion.bukkit.listeners.multiversion.PlayerSneakListener;
 import us.myles.ViaVersion.bukkit.listeners.protocol1_9to1_8.*;
 import us.myles.ViaVersion.bukkit.providers.BukkitBlockConnectionProvider;
 import us.myles.ViaVersion.bukkit.providers.BukkitInventoryQuickMoveProvider;
@@ -76,6 +77,13 @@ public class BukkitViaLoader implements ViaPlatformLoader {
         storeListener(new DeathListener(plugin)).register();
         storeListener(new BlockListener(plugin)).register();
 
+        if (ProtocolRegistry.SERVER_PROTOCOL < ProtocolVersion.v1_14.getId()) {
+            boolean use1_9Fix = plugin.getConf().is1_9HitboxFix() && ProtocolRegistry.SERVER_PROTOCOL < ProtocolVersion.v1_9.getId();
+            if (use1_9Fix || plugin.getConf().is1_14HitboxFix()) {
+                storeListener(new PlayerSneakListener(plugin, use1_9Fix, plugin.getConf().is1_14HitboxFix())).register();
+            }
+        }
+
         if ((Bukkit.getVersion().toLowerCase().contains("paper")
                 || Bukkit.getVersion().toLowerCase().contains("taco")
                 || Bukkit.getVersion().toLowerCase().contains("torch"))

bungee/src/main/java/us/myles/ViaVersion/bungee/platform/BungeeViaConfig.java

@@ -10,7 +10,7 @@ import java.net.URL;
 import java.util.*;
 
 public class BungeeViaConfig extends Config implements ViaVersionConfig {
-    private static List<String> UNSUPPORTED = Arrays.asList("nms-player-ticking", "item-cache", "anti-xray-patch", "quick-move-action-fix", "velocity-ping-interval", "velocity-ping-save", "velocity-servers", "blockconnection-method");
+    private static List<String> UNSUPPORTED = Arrays.asList("nms-player-ticking", "item-cache", "anti-xray-patch", "quick-move-action-fix", "velocity-ping-interval", "velocity-ping-save", "velocity-servers", "blockconnection-method", "change-1_9-hitbox", "change-1_14-hitbox");
 
     public BungeeViaConfig(File configFile) {
         super(new File(configFile, "config.yml"));
@@ -307,8 +307,19 @@ public class BungeeViaConfig extends Config implements ViaVersionConfig {
     public boolean isTruncate1_14Books() {
         return getBoolean("truncate-1_14-books", false);
     }
-    
+
+    @Override
     public boolean isLeftHandedHandling() {
         return getBoolean("left-handed-handling", true);
     }
+
+    @Override
+    public boolean is1_9HitboxFix() {
+        return false;
+    }
+
+    @Override
+    public boolean is1_14HitboxFix() {
+        return false;
+    }
 }

common/src/main/java/us/myles/ViaVersion/api/ViaListener.java

@@ -33,7 +33,7 @@ public abstract class ViaListener {
     protected boolean isOnPipe(UUID uuid) {
         UserConnection userConnection = getUserConnection(uuid);
         return userConnection != null &&
-                userConnection.get(ProtocolInfo.class).getPipeline().contains(requiredPipeline);
+                (requiredPipeline == null || userConnection.get(ProtocolInfo.class).getPipeline().contains(requiredPipeline));
     }
 
     /**

common/src/main/java/us/myles/ViaVersion/api/ViaVersionConfig.java

@@ -316,11 +316,25 @@ public interface ViaVersionConfig {
      * @return True if enabled
      */
     boolean isTruncate1_14Books();
-    
+
     /**
      * Handles left handed info by using unused bit 7 on Client Settings packet
      *
      * @return True if enabled
      */
     boolean isLeftHandedHandling();
+
+    /**
+     * Fixes velocity bugs due to different hitbox for 1.9-1.13 clients on 1.8 servers.
+     *
+     * @return True if enabled
+     */
+    boolean is1_9HitboxFix();
+
+    /**
+     * Fixes velocity bugs due to different hitbox for 1.14+ clients on sub 1.14 servers.
+     *
+     * @return True if enabled
+     */
+    boolean is1_14HitboxFix();
 }

common/src/main/resources/assets/viaversion/config.yml

@@ -120,6 +120,12 @@ disable-1_13-auto-complete: false
 fix-low-snow-collision: false
 # In 1.14 the client page limit has been upped to 100 (from 50). Some anti-exploit plugins ban when clients go higher than 50. This option cuts edited books to 50 pages.
 truncate-1_14-books: false
+# This prevents clients using 1.9-1.13 on 1.8 servers from receiving no knockback/having velocity bugs whilst sneaking under a block.
+change-1_9-hitbox: false
+# Similar to the above, but for 1.14+ players on 1.8-1.13 servers.
+# WARNING: This gives 1.14+ players the ability to sneak under blocks, that players under that version cannot (sneaking in places that are only 1.5 blocks high)!
+# Another thing to remember is that those players might be missed by projectiles and other hits directed at the very top of their head whilst sneaking.
+change-1_14-hitbox: false
 #
 # Enable serverside block-connections for 1.13+ clients
 serverside-blockconnections: false

sponge/src/main/java/us/myles/ViaVersion/sponge/platform/SpongeViaConfig.java

@@ -13,7 +13,7 @@ import java.util.Map;
 import java.util.Optional;
 
 public class SpongeViaConfig extends Config implements ViaVersionConfig {
-    private static List<String> UNSUPPORTED = Arrays.asList("anti-xray-patch", "bungee-ping-interval", "bungee-ping-save", "bungee-servers", "velocity-ping-interval", "velocity-ping-save", "velocity-servers", "quick-move-action-fix");
+    private static List<String> UNSUPPORTED = Arrays.asList("anti-xray-patch", "bungee-ping-interval", "bungee-ping-save", "bungee-servers", "velocity-ping-interval", "velocity-ping-save", "velocity-servers", "quick-move-action-fix", "change-1_9-hitbox", "change-1_14-hitbox");
     private final PluginContainer pluginContainer;
 
     public SpongeViaConfig(PluginContainer pluginContainer, File configFile) {
@@ -260,8 +260,19 @@ public class SpongeViaConfig extends Config implements ViaVersionConfig {
     public boolean isTruncate1_14Books() {
         return getBoolean("truncate-1_14-books", false);
     }
-    
+
+    @Override
     public boolean isLeftHandedHandling() {
         return getBoolean("left-handed-handling", true);
     }
+
+    @Override
+    public boolean is1_9HitboxFix() {
+        return false;
+    }
+
+    @Override
+    public boolean is1_14HitboxFix() {
+        return false;
+    }
 }

velocity/src/main/java/us/myles/ViaVersion/velocity/platform/VelocityViaConfig.java

@@ -9,7 +9,7 @@ import java.net.URL;
 import java.util.*;
 
 public class VelocityViaConfig extends Config implements ViaVersionConfig {
-    private static List<String> UNSUPPORTED = Arrays.asList("nms-player-ticking", "item-cache", "anti-xray-patch", "quick-move-action-fix", "bungee-ping-interval", "bungee-ping-save", "bungee-servers", "blockconnection-method");
+    private static List<String> UNSUPPORTED = Arrays.asList("nms-player-ticking", "item-cache", "anti-xray-patch", "quick-move-action-fix", "bungee-ping-interval", "bungee-ping-save", "bungee-servers", "blockconnection-method", "change-1_9-hitbox", "change-1_14-hitbox");
 
     public VelocityViaConfig(File configFile) {
         super(new File(configFile, "config.yml"));
@@ -312,8 +312,20 @@ public class VelocityViaConfig extends Config implements ViaVersionConfig {
     public boolean isTruncate1_14Books() {
         return getBoolean("truncate-1_14-books", false);
     }
-    
+
+    @Override
     public boolean isLeftHandedHandling() {
         return getBoolean("left-handed-handling", true);
     }
+
+
+    @Override
+    public boolean is1_9HitboxFix() {
+        return false;
+    }
+
+    @Override
+    public boolean is1_14HitboxFix() {
+        return false;
+    }
 }