steveneaston · September 15, 2015 17:21 · Sep 15, 2015
diff --git a/VerifyShopifyWebhook.php b/VerifyShopifyWebhook.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class VerifyShopifyWebhook
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        if (! $this->verifyShopifySignature($request)) {
+            abort(401);
+        }
+
+        return $next($request);
+    }
+
+    private function verifyShopifySignature($request)
+    {
+        return ($request->header('x-shopify-hmac-sha256') == $this->calculateHmac());
+    }
+
+    private function calculateHmac()
+    {
+        $data = file_get_contents('php://input');
+        return base64_encode(hash_hmac('sha256', $data, env('SHOPIFY_APP_SECRET'), true));
+    }
+}