UTD

src/main/java/si/jernejtdo/LitePermissions/Spigot/LitePermissions.java

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+package si.jernejtdo.LitePermissions.Spigot;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+import si.jernejtdo.LitePermissions.Spigot.Permissible.PlayerJoinInject;
+
+public class LitePermissions extends JavaPlugin {
+
+	private static LitePermissions plugin;
+	
+	@Override
+	public void onEnable() {
+		plugin = this;
+		
+		plugin.getServer().getPluginManager().registerEvents(new PlayerJoinInject(), plugin);
+	}
+	
+	@Override
+	public void onDisable() {
+		
+	}
+	
+	public static LitePermissions getPlugin() {
+		return plugin;
+	}
+}

src/main/java/si/jernejtdo/LitePermissions/Spigot/Permissible/CustomPermissible.java

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+package si.jernejtdo.LitePermissions.Spigot.Permissible;
+
+import org.bukkit.permissions.PermissibleBase;
+import org.bukkit.permissions.ServerOperator;
+
+public class CustomPermissible extends PermissibleBase {
+
+    public CustomPermissible(ServerOperator opable) {
+        super(opable);
+    }
+
+    @Override
+    public boolean hasPermission(String inName) {
+    	return checkPermissions(inName);
+    }
+
+    @Override
+    public boolean hasPermission(org.bukkit.permissions.Permission perm) {
+    	return checkPermissions(perm.toString());
+    }
+    
+    public boolean checkPermissions(String inName) {
+    	boolean has = false;
+    	
+    	/*
+    	 * My check logic
+    	 * Get all permissions from RamData
+    	 * Check if player has permission
+    	 * 
+    	 */
+    	
+    	return has;
+    }
+}

src/main/java/si/jernejtdo/LitePermissions/Spigot/Permissible/PermissionInjector.java

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+package si.jernejtdo.LitePermissions.Spigot.Permissible;
+
+import org.bukkit.entity.Player;
+
+import java.lang.reflect.Field;
+
+public class PermissionInjector {
+
+    public static void injectCustomPermissible(Player player) {
+        try {
+            Field permField = player.getClass().getDeclaredField("perm");
+            permField.setAccessible(true);
+            CustomPermissible customPerm = new CustomPermissible(player);
+            permField.set(player, customPerm);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/si/jernejtdo/LitePermissions/Spigot/Permissible/PlayerJoinInject.java

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+package si.jernejtdo.LitePermissions.Spigot.Permissible;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class PlayerJoinInject implements Listener {
+
+	@EventHandler
+	public void onJoinInject(PlayerJoinEvent event) {
+		PermissionInjector.injectCustomPermissible(event.getPlayer());
+	}
+}