Actually hook up asset deletion

(fix #2296)

Author: zerocrates

application/Module.php

@@ -63,6 +63,12 @@ public function attachListeners(SharedEventManagerInterface $sharedEventManager)
             [$this, 'deleteMediaFiles']
         );
 
+        $sharedEventManager->attach(
+            'Omeka\Entity\Asset',
+            'entity.remove.post',
+            [$this, 'deleteAssetFile']
+        );
+
         $sharedEventManager->attach(
             'Omeka\Entity\ResourceTemplate',
             'entity.update.pre',
@@ -337,6 +343,18 @@ public function deleteMediaFiles(ZendEvent $event)
         }
     }
 
+    /**
+     * Delete the file associated with a removed Asset entity.
+     *
+     * @param ZendEvent $event
+     */
+    public function deleteAssetFile(ZendEvent $event)
+    {
+        $asset = $event->getTarget();
+        $store = $this->getServiceLocator()->get('Omeka\File\Store');
+        $store->delete(sprintf('asset/%s', $asset->getFilename()));
+    }
+
     /**
      * Refresh resource titles when updating a resource template.
      *