first upload all files

Modules/Coupon/Checkers/ExcludedProducts.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\InapplicableCouponException;
+
+class ExcludedProducts
+{
+    public function handle($coupon, Closure $next)
+    {
+        $coupon->load('excludeProducts');
+
+        if ($coupon->excludeProducts->isEmpty()) {
+            return $next($coupon);
+        }
+
+        foreach (Cart::items() as $cartItem) {
+            if ($this->inExcludedProducts($coupon, $cartItem)) {
+                throw new InapplicableCouponException;
+            }
+        }
+
+        return $next($coupon);
+    }
+
+    private function inExcludedProducts($coupon, $cartItem)
+    {
+        return $coupon->excludeProducts->contains($cartItem->product);
+    }
+}