0.1.0 beta

First public (pre) release

src/config.yml

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+#Custom health to be displayed instead
+#Must be higher than 0
+custom-health: 20.0

src/me/kuraky/antihealthbars/AntiHealthbars.java

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+package me.kuraky.antihealthbars;
+
+import com.comphenix.protocol.ProtocolLibrary;
+import org.bukkit.command.PluginCommand;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class AntiHealthbars extends JavaPlugin {
+
+    private float customHealth;
+    private static AntiHealthbars INSTANCE;
+
+    @Override
+    public void onEnable() {
+        INSTANCE = this;
+        saveDefaultConfig();
+        setCustomHealth(getConfig().getDouble("custom-health"));
+        ProtocolLibrary.getProtocolManager().addPacketListener(new HealthbarAdapter());
+
+        PluginCommand reloadCommand = getCommand("ahreload");
+        if(reloadCommand != null) reloadCommand.setExecutor(new ReloadCommand());
+    }
+
+    public static AntiHealthbars getINSTANCE() {
+        return INSTANCE;
+    }
+
+    public float getCustomHealth() {
+        return customHealth;
+    }
+
+    public void setCustomHealth(double customHealth) {
+        if(customHealth < 0.00001) customHealth = 0.00001;
+        this.customHealth = (float) customHealth;
+    }
+}

src/me/kuraky/antihealthbars/HealthbarAdapter.java

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+package me.kuraky.antihealthbars;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import net.minecraft.server.v1_15_R1.DataWatcher;
+
+import java.lang.reflect.Field;
+import java.util.List;
+
+public class HealthbarAdapter extends PacketAdapter {
+
+    public HealthbarAdapter() {
+        super(AntiHealthbars.getINSTANCE(), ListenerPriority.HIGHEST, PacketType.Play.Server.ENTITY_METADATA);
+    }
+
+    @Override
+    public void onPacketSending(PacketEvent event) {
+        int entityId = event.getPacket().getIntegers().read(0);
+        int playerId = event.getPlayer().getEntityId();
+
+        if(entityId != playerId) {
+            Object packet = event.getPacket().deepClone().getHandle();
+            try {
+                Field list = packet.getClass().getDeclaredField("b");
+                list.setAccessible(true);
+
+                List<DataWatcher.Item> items = (List<DataWatcher.Item>) list.get(packet);
+
+                for (DataWatcher.Item item : items) {
+                    if (item.a().hashCode() == 8) { //index for health in metadata
+                        Field b = item.getClass().getDeclaredField("b"); //it's stored there
+                        b.setAccessible(true);
+                        try {
+                            if ((Float) b.get(item) > 0) { //we don't want to change player's health if it's equal to 0, otherwise death animation won't play
+                                b.set(item, AntiHealthbars.getINSTANCE().getCustomHealth());
+                                event.setPacket(PacketContainer.fromPacket(packet));
+                            }
+                        } catch (ClassCastException | IllegalArgumentException ignored) { //the class cast exception will be catched a lot, due to 8 also being an index for other values
+                        }
+                        break;
+                    }
+                }
+            } catch (NoSuchFieldException | IllegalAccessException e) {
+                e.printStackTrace();
+                ProtocolLibrary.getProtocolManager().removePacketListener(this);
+            }
+        }
+    }
+}

src/me/kuraky/antihealthbars/ReloadCommand.java

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+package me.kuraky.antihealthbars;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+
+public class ReloadCommand implements CommandExecutor {
+
+    @Override
+    public boolean onCommand(CommandSender commandSender, Command command, String s, String[] strings) {
+        if(commandSender.hasPermission("antihealthbars.reload")) {
+            AntiHealthbars plugin = AntiHealthbars.getINSTANCE();
+
+            plugin.reloadConfig();
+
+            double customHealth = plugin.getConfig().getDouble("custom-health");
+            plugin.setCustomHealth(customHealth);
+
+            commandSender.sendMessage("§aReloaded, set health to §e" + customHealth);
+        }
+        return false;
+    }
+}

src/plugin.yml

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+name: AntiHealthbars
+main: me.kuraky.antihealthbars.AntiHealthbars
+version: 0.1.0b
+description: Blocks healthbar mods
+api-version: 1.15
+author: Kuraky
+depend: [ProtocolLib]
+permissions:
+  antihealthbars.reload:
+    description: Allows reloading the config
+commands:
+  ahreload:
+    description: Reloads the config
+    permission: antihealthbars.reload