implement a mechanism to return a file from a flysystem filesystem.

src/Controllers/AbstractController.php

@@ -5,6 +5,7 @@ namespace Benzine\Controllers;
 use Benzine\Controllers\Filters\Filter;
 use Benzine\Exceptions\FilterDecodeException;
 use Benzine\ORM\Abstracts\AbstractService;
+use League\Flysystem\Filesystem;
 use Monolog\Logger;
 use Slim\Psr7\Request;
 use Slim\Psr7\Response;
@@ -111,4 +112,19 @@ abstract class AbstractController
             ->withStatus(404)
         ;
     }
+
+    protected function returnFile(Filesystem $filesystem, string $filename) : Response{
+        $response = new Response();
+        if(!$filesystem->has($filename)){
+            return $this->pageNotFound();
+        }
+
+        //\Kint::dump($filesystem->getMimetype($assetName));exit;
+
+        $response->getBody()
+            ->write($filesystem->read($filename));
+        ;
+
+        return $response->withHeader("Content-type", $filesystem->getMimetype($filename));
+    }
 }