diff --git a/lib/Controller/PrinterController.php b/lib/Controller/PrinterController.php
index 70b7de0..4bfd574 100644
--- a/lib/Controller/PrinterController.php
+++ b/lib/Controller/PrinterController.php
@@ -6,42 +6,35 @@ use OCP\AppFramework\Controller;
 use OCP\AppFramework\Http\JSONResponse;
 use OCP\IRequest;
 use Symfony\Component\Process\Process;
+use OCA\Printer\Service\Printer;
+use Symfony\Component\Process\Exception\ProcessFailedException;
 
 class PrinterController extends Controller
 {
+    /**
+     * @var OC\L10N\LazyL10N
+     */
     protected $language;
 
-    public function __construct($appName, IRequest $request)
+    /**
+     * @var Printer
+     */
+    protected $printer;
+
+    public function __construct(string $appName, IRequest $request, Printer $printer)
     {
         parent::__construct($appName, $request);
 
         $this->language = \OC::$server->getL10N('printer');
+        $this->printer = $printer;
     }
 
     /**
-     * callback function to get md5 hash of a file.
-     *
      * @NoAdminRequired
-     *
-     * @param (string) $sourcefile  - filename
-     * @param (string) $orientation - Orientation of printed file
      */
-    public function printfile($sourcefile, $orientation)
+    public function printfile(string $sourcefile, string $orientation): JSONResponse
     {
-        $filefullpath = \OC\Files\Filesystem::getLocalFile($sourcefile);
-
-        $options = [
-            'landscape' => [
-                'lpr',
-                $filefullpath,
-            ],
-            'portrait' => [
-                'lpr',
-                '-o',
-                'orientation-requested=4',
-                $filefullpath,
-            ],
-        ];
+        $file = \OC\Files\Filesystem::getLocalFile($sourcefile);
 
         $success = [
             'response' => 'success',
@@ -53,17 +46,16 @@ class PrinterController extends Controller
             'msg' => $this->language->t('Print failed'),
         ];
 
-        if (!isset($options[$orientation])) {
+        if (!$this->printer->isValidOrirentation($orientation)) {
             return new JSONResponse($error);
         }
 
-        $process = new Process($options[$orientation]);
-        $process->run();
+        try {
+            $this->printer->print($file, $orientation);
 
-        if ($process->isSuccessful()) {
             return new JSONResponse($success);
+        } catch (ProcessFailedException $exception) {
+            return new JSONResponse($error);
         }
-
-        return new JSONResponse($error);
     }
 }
diff --git a/lib/Service/Printer.php b/lib/Service/Printer.php
new file mode 100644
index 0000000..3150e11
--- /dev/null
+++ b/lib/Service/Printer.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Service;
+namespace OCA\Printer\Service;
+
+use Symfony\Component\Process\Process;
+
+/**
+ * class Printer.
+ *
+ * @author Simon Vieille <simon@deblan.fr>
+ */
+class Printer
+{
+    public function print(string $file, string $orientation)
+    {
+        $options = [
+            'landscape' => [
+                'lpr',
+                $file,
+            ],
+            'portrait' => [
+                'lpr',
+                '-o',
+                'orientation-requested=4',
+                $file,
+            ],
+        ];
+
+        $process = new Process($options[$orientation]);
+        $process->mustRun();
+    }
+
+    /**
+     * Validates an orientation.
+     */
+    public function isValidOrirentation(string $orientation): bool
+    {
+        return in_array($orientation, [
+            'landscape',
+            'portrait',
+        ]);
+    }
+}