Fix & Enhance Whitelist

src/main/java/ch/njol/skript/conditions/CondIsWhitelisted.java

@@ -19,72 +19,73 @@
 package ch.njol.skript.conditions;
 
 import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
+import org.bukkit.OfflinePlayer;
 import org.bukkit.event.Event;
 import org.eclipse.jdt.annotation.Nullable;
 
 import ch.njol.skript.Skript;
 import ch.njol.skript.doc.Description;
 import ch.njol.skript.doc.Examples;
 import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.RequiredPlugins;
 import ch.njol.skript.doc.Since;
 import ch.njol.skript.lang.Condition;
 import ch.njol.skript.lang.Expression;
 import ch.njol.skript.lang.SkriptParser.ParseResult;
 import ch.njol.util.Kleenean;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Name("Is Whitelisted")
-@Description("Whether or not the server or a player is whitelisted.")
-@Examples({"if server is whitelisted:", "if player is whitelisted"})
-@Since("2.5.2")
+@Description("Whether or not the server or a player is whitelisted, or the server is whitelist enforced.")
+@Examples({
+	"if player is whitelisted:",
+	"if server is whitelisted:",
+	"if server is whitelist enforced:"
+})
+@Since("2.5.2, INSERT VERSION (enforce, offline players)")
+@RequiredPlugins("Minecraft 1.17+ (enforce)")
 public class CondIsWhitelisted extends Condition {
-
+
+	private static final boolean ENFORCE_SUPPORT = Skript.methodExists(Bukkit.class, "isWhitelistEnforced");
+
 	static {
-		Skript.registerCondition(CondIsWhitelisted.class,
-			"[the] server (is|1¦is(n't| not)) white[ ]listed",
-			"%players% (is|are)(|1¦(n't| not)) white[ ]listed");
+		List<String> patterns = new ArrayList<>();
+		patterns.add("[the] server (is|not:(isn't|is not)) white[ ]listed");
+		patterns.add("%offlineplayers% (is|are|not:(isn't|is not|aren't|are not)) white[ ]listed");
+		if (ENFORCE_SUPPORT)
+			patterns.add("[the] white[ ]list (is|not:(isn't|is not)) enforced");
+		Skript.registerCondition(CondIsWhitelisted.class, patterns.toArray(new String[0]));
 	}
-	
+
 	@Nullable
-	private Expression<Player> player;
-	
+	private Expression<OfflinePlayer> players;
+
 	private boolean isServer;
-
+	private boolean isEnforce;
+
 	@Override
 	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
-		setNegated(parseResult.mark == 1);
-		isServer = matchedPattern == 0;
+		setNegated(parseResult.hasTag("not"));
+		isServer = matchedPattern != 1;
+		isEnforce = matchedPattern == 2;
 		if (matchedPattern == 1)
-			player = (Expression<Player>) exprs[0];
+			players = (Expression<OfflinePlayer>) exprs[0];
 		return true;
 	}
-	
+
 	@Override
-	@SuppressWarnings("null")
-	public boolean check(Event e) {
+	public boolean check(Event event) {
 		if (isServer)
-			return Bukkit.hasWhitelist() == isNegated();
-		Player[] players = player.getAll(e);
-		if (player.getAnd() && isNegated()) {
-			for (Player player : players)
-				if (player.isWhitelisted())
-					return false;
-		} else if(player.getAnd()){
-			for (Player player : players)
-				if (!player.isWhitelisted())
-					return false;
-		} else {
-			for (Player player: players)
-				if(player.isWhitelisted())
-					return !isNegated();
-		}
-		return !isNegated();
+			return (isEnforce ? Bukkit.isWhitelistEnforced() : Bukkit.hasWhitelist()) ^ isNegated();
+		return players.check(event, OfflinePlayer::isWhitelisted, isNegated());
 	}
-	
+
 	@Override
-	@SuppressWarnings("null")
-	public String toString(@Nullable Event e, boolean debug) {
-		return (player.getSingle(e) != null ? "player" : "server") + (isNegated() ? "not" : "") + "  whitelisted";
+	public String toString(@Nullable Event event, boolean debug) {
+		return (players != null ? players.toString(event, debug) : "server") + " is " + (isNegated() ? "not" : "") + " "
+			+ (isEnforce ? "whitelist enforced" : "whitelisted");
 	}
-	
+
 }

src/main/java/ch/njol/skript/effects/EffEnforceWhitelist.java

@@ -0,0 +1,94 @@
+/**
+ * This file is part of Skript.
+ *
+ * Skript 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.
+ *
+ * Skript 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 Skript.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Copyright Peter Güttinger, SkriptLang team and contributors
+ */
+package ch.njol.skript.effects;
+
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.eclipse.jdt.annotation.Nullable;
+
+import java.io.File;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.doc.RequiredPlugins;
+import ch.njol.skript.lang.Effect;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.skript.util.Utils;
+import ch.njol.util.Kleenean;
+
+@Name("Enforce Whitelist")
+@Description("Enforces or un-enforce a server's whitelist. All non-whitelisted players will be kicked upon enforcing the whitelist.")
+@Examples({
+	"enforce the whitelist",
+	"unenforce the whitelist"
+})
+@Since("INSERT VERSION")
+@RequiredPlugins("Minecraft 1.17+")
+public class EffEnforceWhitelist extends Effect {
+
+	private static String NOT_WHITELISTED_MESSAGE = "You are not whitelisted on this server!";
+
+	static {
+		if (Skript.methodExists(Bukkit.class, "setWhitelistEnforced", boolean.class)) {
+			try {
+				YamlConfiguration spigotYml = YamlConfiguration.loadConfiguration(new File("spigot.yml"));
+				NOT_WHITELISTED_MESSAGE = (String) spigotYml.get("messages.whitelist", NOT_WHITELISTED_MESSAGE);
+			} catch (Exception ignored) {}
+			Skript.registerEffect(EffEnforceWhitelist.class, "[:un]enforce [the] white[ ]list");
+		}
+	}
+
+	private boolean enforce;
+
+	@Override
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		enforce = !parseResult.hasTag("un");
+		return true;
+	}
+
+	@Override
+	protected void execute(Event event) {
+		Bukkit.setWhitelistEnforced(enforce);
+		reloadWhitelist();
+	}
+
+	// A workaround for Bukkit's not kicking non-whitelisted players upon enforcement
+	public static void reloadWhitelist() {
+		Bukkit.reloadWhitelist();
+		if (!Bukkit.hasWhitelist() || !Bukkit.isWhitelistEnforced())
+			return;
+		for (Player player : Bukkit.getOnlinePlayers()) {
+			if (!player.isWhitelisted() && !player.isOp())
+				player.kickPlayer(Utils.replaceChatStyles(NOT_WHITELISTED_MESSAGE));
+		}
+	}
+
+	@Override
+	public String toString(@Nullable Event e, boolean debug) {
+		return (!enforce ? "un" : "") + "enforce the whitelist";
+	}
+
+}

src/main/java/ch/njol/skript/expressions/ExprWhitelist.java

@@ -19,6 +19,7 @@
  */
 package ch.njol.skript.expressions;
 
+import ch.njol.skript.effects.EffEnforceWhitelist;
 import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.event.Event;
@@ -38,83 +39,86 @@
 import ch.njol.util.coll.CollectionUtils;
 
 @Name("Whitelist")
-@Description("A server's whitelist." +
-	"This expression can be used to add/remove players to/from the whitelist," +
-	" to enable it and disable it (set whitelist to true / set whitelist to false)," +
-	" and to empty it (reset whitelist)")
-@Examples({"set whitelist to false",
+@Description({
+	"The server's whitelist.",
+	"This expression can be used to add/remove players to/from the whitelist.",
+	"To enable and disable it (set whitelist to true/false), and to empty it (reset whitelist)"
+})
+@Examples({
+	"set whitelist to false",
 	"add all players to whitelist",
-	"reset the whitelist"})
+	"reset the whitelist"
+})
 @Since("2.5.2")
 public class ExprWhitelist extends SimpleExpression<OfflinePlayer> {
-	
+
 	static {
 		Skript.registerExpression(ExprWhitelist.class, OfflinePlayer.class, ExpressionType.SIMPLE, "[the] white[ ]list");
 	}
-	
+
 	@Override
 	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
 		return true;
 	}
-
-	@Nullable
+
 	@Override
-	protected OfflinePlayer[] get(Event e) {
+	protected OfflinePlayer[] get(Event event) {
 		return Bukkit.getServer().getWhitelistedPlayers().toArray(new OfflinePlayer[0]);
 	}
-
-	@Nullable
+
 	@Override
 	public Class<?>[] acceptChange(ChangeMode mode) {
-		if (mode == ChangeMode.ADD || mode == ChangeMode.REMOVE)
+		if (mode == ChangeMode.ADD || mode == ChangeMode.REMOVE) {
 			return CollectionUtils.array(OfflinePlayer[].class);
-		else if (mode == ChangeMode.SET || mode == ChangeMode.RESET)
+		} else if (mode == ChangeMode.SET || mode == ChangeMode.RESET) {
 			return CollectionUtils.array(Boolean.class);
-		else
-			return null;
+		}
+		return null;
 	}
-	
+
 	@Override
-	public void change(Event e, @Nullable Object[] delta, ChangeMode mode) {
+	public void change(Event event, Object @Nullable [] delta, ChangeMode mode) {
+		if (delta == null && mode != ChangeMode.RESET)
+			return;
 		switch (mode) {
 			case SET:
-				if (delta != null)
-					Bukkit.setWhitelist((Boolean) delta[0]);
+				boolean value = (Boolean) delta[0];
+				Bukkit.setWhitelist(value);
+				if (value)
+					EffEnforceWhitelist.reloadWhitelist();
 				break;
 			case ADD:
-				if (delta != null) {
-					for (Object p : delta)
-						((OfflinePlayer) p).setWhitelisted(true);
-				}
+				for (Object player : delta)
+					((OfflinePlayer) player).setWhitelisted(true);
 				break;
 			case REMOVE:
-				if (delta != null) {
-					for (Object p : delta)
-						((OfflinePlayer) p).setWhitelisted(false);
-				}
+				for (Object player : delta)
+					((OfflinePlayer) player).setWhitelisted(false);
+				EffEnforceWhitelist.reloadWhitelist();
 				break;
 			case RESET:
-				for (OfflinePlayer p : Bukkit.getWhitelistedPlayers())
-					p.setWhitelisted(false);
+				for (OfflinePlayer player : Bukkit.getWhitelistedPlayers()) {
+					player.setWhitelisted(false);
+				}
 				break;
 			default:
 				assert false;
 		}
 	}
-	
+
 	@Override
 	public boolean isSingle() {
 		return false;
 	}
-	
+
 	@Override
 	public Class<? extends OfflinePlayer> getReturnType() {
 		return OfflinePlayer.class;
 	}
-	
+
 	@Override
-	public String toString(@Nullable Event e, boolean debug) {
+	public String toString(@Nullable Event event, boolean debug) {
 		return "whitelist";
 	}
-	
+
 }