add level maintainer permission control

src/main/java/com/glodblock/github/common/block/BlockLevelMaintainer.java

@@ -1,6 +1,8 @@
 package com.glodblock.github.common.block;
 
+import appeng.api.config.SecurityPermissions;
 import appeng.block.AEBaseItemBlock;
+import appeng.util.Platform;
 import com.glodblock.github.client.render.RenderBlockLevelMaintainer;
 import com.glodblock.github.common.tabs.FluidCraftingTabs;
 import com.glodblock.github.common.tile.TileLevelMaintainer;
@@ -8,12 +10,14 @@ import com.glodblock.github.inventory.InventoryHandler;
 import com.glodblock.github.inventory.gui.GuiType;
 import com.glodblock.github.util.BlockPos;
 import com.glodblock.github.util.NameConst;
+import com.glodblock.github.util.Util;
 import cpw.mods.fml.common.registry.GameRegistry;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
 import net.minecraft.block.material.Material;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.ChatComponentText;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.world.World;
 
@@ -46,8 +50,12 @@ public class BlockLevelMaintainer extends FCBaseBlock {
         }
         TileLevelMaintainer tile = getTileEntity(world, x, y, z);
         if (tile != null) {
-            if (!world.isRemote) {
-                InventoryHandler.openGui(player, world, new BlockPos(x, y, z), EnumFacing.getFront(facing), GuiType.LEVEL_MAINTAINER);
+            if (Platform.isServer()) {
+                if (Util.hasPermission(player, SecurityPermissions.CRAFT, tile)) {
+                    InventoryHandler.openGui(player, world, new BlockPos(x, y, z), EnumFacing.getFront(facing), GuiType.LEVEL_MAINTAINER);
+                } else {
+                    player.addChatComponentMessage(new ChatComponentText("You don't have permission to view."));
+                }
             }
             return true;
         }