OS-110 injecting dependency

Author: stankut

modules/os2forms_attachment/os2forms_attachment.services.yml

@@ -1,4 +1,4 @@
 services:
   os2forms_attachment.print_builder:
     class: Drupal\os2forms_attachment\Os2formsAttachmentPrintBuilder
-    arguments: ['@entity_print.renderer_factory', '@event_dispatcher', '@string_translation']
+    arguments: ['@entity_print.renderer_factory', '@event_dispatcher', '@string_translation', '@file_system']

modules/os2forms_attachment/src/Os2formsAttachmentPrintBuilder.php

@@ -4,16 +4,27 @@
 
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\File\FileExists;
+use Drupal\Core\File\FileSystemInterface;
+use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\entity_print\Event\PreSendPrintEvent;
 use Drupal\entity_print\Event\PrintEvents;
 use Drupal\entity_print\Plugin\PrintEngineInterface;
 use Drupal\entity_print\PrintBuilder;
+use Drupal\entity_print\Renderer\RendererFactoryInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * The OS2Forms attachment print builder service.
  */
 class Os2formsAttachmentPrintBuilder extends PrintBuilder {
 
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(RendererFactoryInterface $renderer_factory, EventDispatcherInterface $event_dispatcher, TranslationInterface $string_translation, protected readonly FileSystemInterface $file_system) {
+    parent::__construct($renderer_factory, $event_dispatcher, $string_translation);
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -55,7 +66,7 @@ public function savePrintableDigitalSignature(array $entities, PrintEngineInterf
     $uri = "$scheme://$filename";
 
     // Save the file.
-    return \Drupal::service('file_system')->saveData($print_engine->getBlob(), $uri, FileExists::Replace);
+    return $this->file_system->saveData($print_engine->getBlob(), $uri, FileExists::Replace);
   }
 
   /**