Added permission nodes for shop creation for specific items

Examples:
- "shopchest.create.apple"
- "shopchest.create.stone.2"

But: If a player has permission "shopchest.create", he is allowed to
create shops of all items. Also, the creation of admin shops is not
affected by these permissions.

src/main/java/de/epiceric/shopchest/ShopCommand.java

@@ -107,8 +107,7 @@ class ShopCommand implements CommandExecutor {
                 Player p = (Player) sender;
 
                 if (args[0].equalsIgnoreCase("create")) {
-
-                    if (p.hasPermission(Permissions.CREATE)) {
+                    if (Utils.hasPermissionToCreateShop(p, Utils.getPreferredItemInHand(p))) {
                         if (args.length == 4) {
                             needsHelp = false;
                             create(args, ShopType.NORMAL, p);
@@ -438,7 +437,7 @@ class ShopCommand implements CommandExecutor {
             }
         }
 
-        plugin.debug(p.getName() + "'s prices are higher than the minimum");
+        plugin.debug(p.getName() + "'s prices are lower than the maximum");
 
         if (sellEnabled && buyEnabled) {
             if (plugin.getShopChestConfig().buy_greater_or_equal_sell) {
@@ -552,7 +551,7 @@ class ShopCommand implements CommandExecutor {
         if (sender instanceof Player) {
             if (sender.hasPermission(Permissions.CREATE_ADMIN)) {
                 sender.sendMessage(ChatColor.GREEN + "/" + plugin.getShopChestConfig().main_command_name + " create <amount> <buy-price> <sell-price> [normal|admin] - " + LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE));
-            } else {
+            } else if (sender.hasPermission(Permissions.CREATE)) {
                 sender.sendMessage(ChatColor.GREEN + "/" + plugin.getShopChestConfig().main_command_name + " create <amount> <buy-price> <sell-price> - " + LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE));
             }
 

src/main/java/de/epiceric/shopchest/utils/Utils.java

@@ -257,6 +257,32 @@ public class Utils {
         return true;
     }
 
+    /**
+     * <p>Check if a player is allowed to create a shop that sells (or buys) the given item.</p>
+     * The player is allowed to create the shop if has either the permission {@code shopchest.create},
+     * {@code shopchest.create.[ITEM]} or {@code shopchest.create.[ITEM].[DURABILITY]}
+     * @param player Player to check
+     * @param item Item to be sold or bought
+     * @return Whether the player is allowed
+     */
+    public static boolean hasPermissionToCreateShop(Player player, ItemStack item) {
+        if (player.hasPermission(Permissions.CREATE)) {
+            return true;
+        }
+
+        if (item.getDurability() == 0) {
+            if (player.hasPermission(Permissions.CREATE + "." + item.getType().toString())) {
+                return true;
+            }
+        }
+
+        if (player.hasPermission(Permissions.CREATE + "." + item.getType().toString() + "." + item.getDurability())) {
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * @param className Name of the class
      * @return Class in {@code net.minecraft.server.[VERSION]} package with the specified name or {@code null} if the class was not found