Add a permission to set a maximum number of shops

plugin.yml

@@ -26,4 +26,14 @@ permissions:
         children:
           chestshop.command.id:
             default: true
-            description: "Allows searching item ID"
+            description: "Allows searching item ID"
+      chestshop.makeshop:
+        default: op
+        description: "Allows making chest shops"
+        children:
+          chestshop.makeshop.1:
+            default: true
+            description: "Allows making 1 chest shop"
+          chestshop.makeshop.unlimited:
+            default: op
+            description: "Allows making unlimited chest shops"

src/ChestShop/ChestShop.php

@@ -5,6 +5,9 @@
 use pocketmine\command\Command;
 use pocketmine\command\CommandSender;
 use pocketmine\item\ItemIds;
+use pocketmine\permission\Permission;
+use pocketmine\permission\PermissionManager;
+use pocketmine\Player;
 use pocketmine\plugin\PluginBase;
 
 class ChestShop extends PluginBase
@@ -33,4 +36,31 @@ public function onCommand(CommandSender $sender, Command $command, string $label
                 return false;
         }
     }
+
+	/**
+	 * Get the maximum number of shops a player can create
+	 *
+	 * @param Player $player
+	 *
+	 * @return int
+	 */
+	public function getMaxPlayerShops(Player $player) : int {
+    	if($player->hasPermission("chestshop.makeshop.unlimited"))
+    		return PHP_INT_MAX;
+	    /** @var Permission[] $perms */
+	    $perms = array_merge(PermissionManager::getInstance()->getDefaultPermissions($player->isOp()), $player->getEffectivePermissions());
+	    $perms = array_filter($perms, function($name) {
+		    return (substr($name, 0, 19) === "chestshop.makeshop.");
+	    }, ARRAY_FILTER_USE_KEY);
+	    if(count($perms) === 0)
+		    return 0;
+	    krsort($perms, SORT_FLAG_CASE | SORT_NATURAL);
+	    foreach($perms as $name => $perm) {
+		    $maxPlots = substr($name, 19);
+		    if(is_numeric($maxPlots)) {
+			    return (int) $maxPlots;
+		    }
+	    }
+	    return 0;
+    }
 }

src/ChestShop/EventListener.php

@@ -163,6 +163,8 @@ public function onSignChange(SignChangeEvent $event)
         if (!is_numeric($price) or $price < 0) return;
         if ($pID === false) return;
         if (($chest = $this->getSideChest($sign)) === false) return;
+        $shops = $this->databaseManager->selectByCondition(["shopOwner" => $shopOwner]);
+        if(!is_array($shops) or count($shops) + 1 > $this->plugin->getMaxPlayerShops($event->getPlayer())) return;
 
         $productName = ItemFactory::get($pID, $pMeta)->getName();
         $event->setLine(0, $shopOwner);