Add world-permission flag

Author: Citymonstret

src/main/java/com/intellectualsites/hyperverse/configuration/Messages.java

@@ -98,6 +98,8 @@ public class Messages {
         "&cThe world could not be removed. Reason: %reason%");
     public static final Message messageWorldRemoved = createMessage("world.removed",
         "&7The world was removed successfully");
+    public static final Message messageNotPermittedEntry = createMessage("world.not_permitted",
+        "&cYou are not allowed to enter that world");
 
     // Flag descriptions
     public static final Message flagDescriptionGamemode = createMessage("flags.gamemode",
@@ -111,6 +113,8 @@ public class Messages {
         "Whether or not player vs. player combat is enabled");
     public static final Message flagDescriptionPve = createMessage("flags.pve",
         "Whether or not player vs. entity combat is enabled");
+    public static final Message flagWorldPermission = createMessage("flags.world-permission",
+        "Permission node required to visit the world");
 
     public static Message createMessage(@NotNull final String key,
         @NotNull final String defaultValue) {

src/main/java/com/intellectualsites/hyperverse/flags/implementation/WorldPermissionFlag.java

@@ -0,0 +1,64 @@
+//
+// Hyperverse - A minecraft world management plugin
+// Copyright © 2020 Alexander Söderberg ([email protected])
+//
+// This program 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.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+package com.intellectualsites.hyperverse.flags.implementation;
+
+import com.intellectualsites.hyperverse.configuration.Messages;
+import com.intellectualsites.hyperverse.flags.FlagParseException;
+import com.intellectualsites.hyperverse.flags.WorldFlag;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.regex.Pattern;
+
+public class WorldPermissionFlag extends WorldFlag<String, WorldPermissionFlag> {
+
+    private static final Pattern permissionPattern = Pattern.compile("[A-Za-z0-9\\-_.]+");
+    public static final WorldPermissionFlag WORLD_PERMISSION_FLAG_DEFAULT = new WorldPermissionFlag("");
+
+    public WorldPermissionFlag(@NotNull final String value) {
+        super(value, Messages.flagWorldPermission);
+    }
+
+    @Override public WorldPermissionFlag parse(@NotNull final String input) throws FlagParseException {
+        if (input.isEmpty()) {
+            return WORLD_PERMISSION_FLAG_DEFAULT;
+        }
+        if (permissionPattern.matcher(input).matches()) {
+            return flagOf(input);
+        }
+        throw new FlagParseException(this, input, "A permission node may only contain alphanumerical characters,"
+            + " -, . and _");
+    }
+
+    @Override public WorldPermissionFlag merge(@NotNull final String newValue) {
+        return flagOf(newValue);
+    }
+
+    @Override public String toString() {
+        return getValue();
+    }
+
+    @Override public String getExample() {
+        return "your.permission.node";
+    }
+
+    @Override protected WorldPermissionFlag flagOf(@NotNull final String value) {
+        return new WorldPermissionFlag(value);
+    }
+
+}

src/main/java/com/intellectualsites/hyperverse/world/SimpleWorld.java

@@ -30,6 +30,7 @@
 import com.intellectualsites.hyperverse.flags.FlagParseException;
 import com.intellectualsites.hyperverse.flags.GlobalWorldFlagContainer;
 import com.intellectualsites.hyperverse.flags.WorldFlag;
+import com.intellectualsites.hyperverse.flags.implementation.WorldPermissionFlag;
 import com.intellectualsites.hyperverse.modules.FlagContainerFactory;
 import com.intellectualsites.hyperverse.modules.HyperWorldCreatorFactory;
 import com.intellectualsites.hyperverse.util.MessageUtil;
@@ -256,10 +257,19 @@ public class SimpleWorld implements HyperWorld {
             throw new IllegalStateException(
                 "Cannot teleport a player to a world before it has been generated");
         }
+
         if (player.getWorld().equals(this.bukkitWorld)) {
             return;
         }
 
+        if (!this.getFlag(WorldPermissionFlag.class).isEmpty()) {
+            final String permission = getFlag(WorldPermissionFlag.class);
+            if (!player.hasPermission(permission)) {
+                MessageUtil.sendMessage(player, Messages.messageNotPermittedEntry);
+                return;
+            }
+        }
+
         final Location location;
         if (this.hyperConfiguration.shouldPersistLocations()) {
             location = this.hyperDatabase.getLocation(player.getUniqueId(),