Custom Permission Handler (#1282)

Co-authored-by: Melledy <52122272+Melledy@users.noreply.github.com>

src/main/java/emu/grasscutter/Grasscutter.java

@@ -6,6 +6,8 @@ import java.util.Calendar;
 import emu.grasscutter.auth.AuthenticationSystem;
 import emu.grasscutter.auth.DefaultAuthentication;
 import emu.grasscutter.command.CommandMap;
+import emu.grasscutter.command.DefaultPermissionHandler;
+import emu.grasscutter.command.PermissionHandler;
 import emu.grasscutter.game.managers.energy.EnergyManager;
 import emu.grasscutter.game.managers.stamina.StaminaManager;
 import emu.grasscutter.plugin.PluginManager;
@@ -58,6 +60,7 @@ public final class Grasscutter {
 	private static GameServer gameServer;
 	private static PluginManager pluginManager;
 	private static AuthenticationSystem authenticationSystem;
+	private static PermissionHandler permissionHandler;
 
 	public static final Reflections reflector = new Reflections("emu.grasscutter");
 	public static ConfigContainer config;
@@ -114,8 +117,9 @@ public final class Grasscutter {
 		// Initialize database.
 		DatabaseManager.initialize();
 		
-		// Initialize the default authentication system.
+		// Initialize the default systems.
 		authenticationSystem = new DefaultAuthentication();
+		permissionHandler = new DefaultPermissionHandler();
 	
 		// Create server instances.
 		httpServer = new HttpServer();
@@ -287,6 +291,10 @@ public final class Grasscutter {
 		return authenticationSystem;
 	}
 
+	public static PermissionHandler getPermissionHandler() {
+		return permissionHandler;
+	}
+
 	public static int getCurrentDayOfWeek() {
 		return day;
 	}
@@ -346,6 +354,14 @@ public final class Grasscutter {
 		Grasscutter.authenticationSystem = authenticationSystem;
 	}
 
+	/**
+	 * Sets the permission handler for the server.
+	 * @param permissionHandler The permission handler to use.
+	 */
+	public static void setPermissionHandler(PermissionHandler permissionHandler) {
+		Grasscutter.permissionHandler = permissionHandler;
+	}
+
 	/*
 	 * Enums for the configuration.
 	 */

src/main/java/emu/grasscutter/command/CommandMap.java

@@ -14,6 +14,7 @@ public final class CommandMap {
     private final Map<String, Command> annotations = new HashMap<>();
     private final Map<String, Integer> targetPlayerIds = new HashMap<>();
     private static final String consoleId = "console";
+
     public CommandMap() {
         this(false);
     }
@@ -202,21 +203,9 @@ public final class CommandMap {
             }
         }
 
-        // Check for permission.
-        if (player != null) {
-            String permissionNode = this.annotations.get(label).permission();
-            String permissionNodeTargeted = this.annotations.get(label).permissionTargeted();
-            Account account = player.getAccount();
-            if (player != targetPlayer) {  // Additional permission required for targeting another player
-                if (!permissionNodeTargeted.isEmpty() && !account.hasPermission(permissionNodeTargeted)) {
-                    CommandHandler.sendTranslatedMessage(player, "commands.generic.permission_error");
-                    return;
-                }
-            }
-            if (!permissionNode.isEmpty() && !account.hasPermission(permissionNode)) {
-                CommandHandler.sendTranslatedMessage(player, "commands.generic.permission_error");
-                return;
-            }
+        // Check for permissions.
+        if (!Grasscutter.getPermissionHandler().checkPermission(player, targetPlayer, this.annotations.get(label).permission(), this.annotations.get(label).permissionTargeted())) {
+            return;
         }
 
         // Check if command has unfulfilled constraints on targetPlayer

src/main/java/emu/grasscutter/command/DefaultPermissionHandler.java

@@ -0,0 +1,32 @@
+package emu.grasscutter.command;
+
+import emu.grasscutter.game.Account;
+import emu.grasscutter.game.player.Player;
+
+public class DefaultPermissionHandler implements PermissionHandler {
+    @Override
+    public boolean EnablePermissionCommand() {
+        return true;
+    }
+
+    @Override
+    public boolean checkPermission(Player player, Player targetPlayer, String permissionNode, String permissionNodeTargeted) {
+        if(player == null) {
+            return true;
+        }
+
+        Account account = player.getAccount();
+        if (player != targetPlayer) {  // Additional permission required for targeting another player
+            if (!permissionNodeTargeted.isEmpty() && !account.hasPermission(permissionNodeTargeted)) {
+                CommandHandler.sendTranslatedMessage(player, "commands.generic.permission_error");
+                return false;
+            }
+        }
+        if (!permissionNode.isEmpty() && !account.hasPermission(permissionNode)) {
+            CommandHandler.sendTranslatedMessage(player, "commands.generic.permission_error");
+            return false;
+        }
+
+        return true;
+    }
+}

src/main/java/emu/grasscutter/command/PermissionHandler.java

@@ -0,0 +1,8 @@
+package emu.grasscutter.command;
+
+import emu.grasscutter.game.player.Player;
+
+public interface PermissionHandler {
+    public boolean EnablePermissionCommand();
+    public boolean checkPermission(Player player, Player targetPlayer, String permissionNode, String permissionNodeTargeted);
+}

src/main/java/emu/grasscutter/command/commands/PermissionCommand.java

@@ -20,6 +20,11 @@ public final class PermissionCommand implements CommandHandler {
             return;
         }
 
+        if(!Grasscutter.getPermissionHandler().EnablePermissionCommand()) {
+            CommandHandler.sendTranslatedMessage(sender, "commands.generic.permission_error");
+            return;
+        }
+
         String action = args.get(0);
         String permission = args.get(1);
 

src/main/java/emu/grasscutter/plugin/api/ServerHook.java

@@ -4,6 +4,7 @@ import emu.grasscutter.Grasscutter;
 import emu.grasscutter.auth.AuthenticationSystem;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.command.PermissionHandler;
 import emu.grasscutter.game.player.Player;
 import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.server.http.HttpServer;
@@ -97,4 +98,12 @@ public final class ServerHook {
     public void setAuthSystem(AuthenticationSystem authSystem) {
         Grasscutter.setAuthenticationSystem(authSystem);
     }
+
+    /**
+     * Sets the server's permission handler.
+     * @param permHandler An instance of the permission handler.
+     */
+    public void setPermissionHandler(PermissionHandler permHandler) {
+        Grasscutter.setPermissionHandler(permHandler);
+    }
 }