Add vanish command and permissions

src/main/java/de/shiewk/smoderation/SModeration.java

@@ -5,18 +5,23 @@ import de.shiewk.smoderation.event.CustomInventoryEvents;
 import de.shiewk.smoderation.event.EnderchestSeeEvents;
 import de.shiewk.smoderation.event.InvSeeEvents;
 import de.shiewk.smoderation.listener.PunishmentListener;
+import de.shiewk.smoderation.listener.VanishListener;
 import de.shiewk.smoderation.storage.PunishmentContainer;
-import net.kyori.adventure.text.Component;
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.format.NamedTextColor;
 import net.kyori.adventure.text.format.TextColor;
 import net.kyori.adventure.text.logger.slf4j.ComponentLogger;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
 import java.io.File;
 
+import static net.kyori.adventure.text.Component.text;
 import static org.bukkit.Bukkit.getPluginManager;
 
 public final class SModeration extends JavaPlugin {
@@ -30,7 +35,7 @@ public final class SModeration extends JavaPlugin {
     public static final TextColor SECONDARY_COLOR = TextColor.color(52, 143, 255);
     public static final TextColor INACTIVE_COLOR = NamedTextColor.GRAY;
     public static final TextColor FAIL_COLOR = NamedTextColor.RED;
-    public static final TextComponent CHAT_PREFIX = Component.text("SM \u00BB ").color(PRIMARY_COLOR);
+    public static final TextComponent CHAT_PREFIX = text("SM \u00BB ").color(PRIMARY_COLOR);
 
     @Override
     public void onLoad() {
@@ -45,6 +50,7 @@ public final class SModeration extends JavaPlugin {
         getPluginManager().registerEvents(new CustomInventoryEvents(), this);
         getPluginManager().registerEvents(new InvSeeEvents(), this);
         getPluginManager().registerEvents(new EnderchestSeeEvents(), this);
+        getPluginManager().registerEvents(new VanishListener(), this);
 
         registerCommand("mute", new MuteCommand());
         registerCommand("ban", new BanCommand());
@@ -55,6 +61,7 @@ public final class SModeration extends JavaPlugin {
         registerCommand("unban", new UnbanCommand());
         registerCommand("invsee", new InvseeCommand());
         registerCommand("enderchestsee", new EnderchestSeeCommand());
+        registerCommand("vanish", new VanishCommand());
 
         container.load(SAVE_FILE);
     }
@@ -72,5 +79,59 @@ public final class SModeration extends JavaPlugin {
     @Override
     public void onDisable() {
         SModeration.container.save(SModeration.SAVE_FILE);
+        for (Player player : Bukkit.getOnlinePlayers()) {
+            // in case players are still vanished when the server shuts down
+            if (isVanished(player)){
+                toggleVanish(player);
+            }
+        }
+    }
+
+    private static final ObjectArrayList<Player> vanishedPlayers = new ObjectArrayList<>();
+
+    public static void toggleVanish(Player player){
+        final boolean newStatus = !isVanished(player);
+        if (newStatus){
+            vanishedPlayers.add(player);
+            for (CommandSender sender : container.collectBroadcastTargets()) {
+                sender.sendMessage(CHAT_PREFIX.append(
+                        player.displayName()
+                                .colorIfAbsent(SECONDARY_COLOR)
+                ).append(
+                        text()
+                                .content(" vanished.")
+                                .color(PRIMARY_COLOR)
+                ));
+            }
+            player.sendMessage(CHAT_PREFIX.append(text("You are now vanished.").color(PRIMARY_COLOR)));
+            player.setVisibleByDefault(false);
+            for (Player onlinePlayer : Bukkit.getOnlinePlayers()) {
+                if (onlinePlayer.hasPermission("smod.vanish.see")){
+                    onlinePlayer.showEntity(PLUGIN, player);
+                }
+            }
+        } else {
+            vanishedPlayers.remove(player);
+            for (CommandSender sender : container.collectBroadcastTargets()) {
+                sender.sendMessage(CHAT_PREFIX.append(
+                        player.displayName()
+                                .colorIfAbsent(SECONDARY_COLOR)
+                ).append(
+                        text()
+                                .content(" re-appeared.")
+                                .color(PRIMARY_COLOR)
+                ));
+            }
+            player.sendMessage(CHAT_PREFIX.append(text("You are no longer vanished.").color(PRIMARY_COLOR)));
+            player.setVisibleByDefault(true);
+        }
+    }
+
+    public static boolean isVanished(Player player){
+        return vanishedPlayers.contains(player);
+    }
+
+    public static ObjectArrayList<Player> getVanishedPlayers() {
+        return vanishedPlayers.clone();
     }
 }

src/main/java/de/shiewk/smoderation/command/VanishCommand.java

@@ -0,0 +1,39 @@
+package de.shiewk.smoderation.command;
+
+import de.shiewk.smoderation.SModeration;
+import de.shiewk.smoderation.util.PlayerUtil;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class VanishCommand implements TabExecutor {
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        Player player = null;
+        if (args.length > 0){
+            player = PlayerUtil.findOnlinePlayer(args[0]);
+        } else if (sender instanceof Player){
+            player = (Player) sender;
+        }
+        if (player != null){
+            SModeration.toggleVanish(player);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        if (args.length < 2){
+            return PlayerUtil.listPlayerNames();
+        }
+        return List.of();
+    }
+}

src/main/java/de/shiewk/smoderation/listener/VanishListener.java

@@ -0,0 +1,34 @@
+package de.shiewk.smoderation.listener;
+
+import de.shiewk.smoderation.SModeration;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+public class VanishListener implements Listener {
+
+    @EventHandler public void onPlayerQuit(PlayerQuitEvent event){
+        final Player player = event.getPlayer();
+        if (SModeration.isVanished(player)){
+            SModeration.toggleVanish(player);
+        }
+        for (Player vanishedPlayer : SModeration.getVanishedPlayers()) {
+            // to clean up visibility status
+            player.hideEntity(SModeration.PLUGIN, vanishedPlayer);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST) public void onPlayerJoin(PlayerJoinEvent event){
+        final Player player = event.getPlayer();
+        if (player.hasPermission("smod.vanish.see")){
+            for (Player vanishedPlayer : SModeration.getVanishedPlayers()) {
+                // to show visible vanished players
+                player.showEntity(SModeration.PLUGIN, vanishedPlayer);
+            }
+        }
+    }
+
+}

src/main/java/de/shiewk/smoderation/util/PlayerUtil.java

@@ -9,7 +9,10 @@ import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.UUID;
+import java.util.function.Predicate;
 
 public abstract class PlayerUtil {
     private PlayerUtil(){}
@@ -55,4 +58,17 @@ public abstract class PlayerUtil {
         return null;
     }
 
+    public static List<String> listPlayerNames(){
+        return listPlayerNames(pl -> true);
+    }
+
+    public static List<String> listPlayerNames(final Predicate<Player> predicate) {
+        final ArrayList<String> names = new ArrayList<>();
+        for (Player onlinePlayer : Bukkit.getOnlinePlayers()) {
+            if (predicate.test(onlinePlayer)){
+                names.add(onlinePlayer.getName());
+            }
+        }
+        return List.copyOf(names);
+    }
 }

src/main/resources/plugin.yml

@@ -71,6 +71,12 @@ commands:
       - ecs
     permission: smod.enderchestsee
     description: Views the ender chest of another player.
+  vanish:
+    usage: "§cUsage: /vanish <player>"
+    aliases:
+      - smvanish
+    permission: smod.vanish
+    description: Toggles vanish mode which prevents other players from seeing you're online
 permissions:
   smod.mute:
     default: op
@@ -126,3 +132,9 @@ permissions:
   smod.preventban:
     default: op
     description: Prevents the player from being muted (if online)
+  smod.vanish:
+    default: op
+    description: Allows the player to use /vanish
+  smod.vanish.see:
+    default: op
+    description: Allows the player to see vanished players