by primsi: the media entity saving eb widget.

modules/eb_widget/src/Plugin/EntityBrowser/Widget/MediaEntityDropzoneJsEbWidget.php

+<?php
+
+/**
+ * Contains \Drupal\dropzonejs_eb_widget\Plugin\EntityBrowser\Widget\MediaEntityDropzoneJsEbWidget.
+ */
+
+namespace Drupal\dropzonejs_eb_widget\Plugin\EntityBrowser\Widget;
+
+use Drupal\Component\Utility\Bytes;
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Session\AccountProxyInterface;
+use Drupal\dropzonejs\DropzoneJsUploadSaveInterface;
+use Drupal\entity_browser\WidgetBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+
+/**
+ * Provides an Entity Browser widget that uploads new files and saves media
+ * entities.
+ *
+ * @EntityBrowserWidget(
+ *   id = "dropzonejs_media_entity",
+ *   label = @Translation("Media Entity DropzoneJS"),
+ *   description = @Translation("Adds DropzoneJS upload integration that saves Media entities.")
+ * )
+ */
+class MediaEntityDropzoneJsEbWidget extends DropzoneJsEbWidget {
+  /**
+   * Module handler service.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * Constructs widget plugin.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+   *   Event dispatcher service.
+   * @param \Drupal\dropzonejs\DropzoneJsUploadSaveInterface $dropzonejs_upload_save
+   *   The upload saving dropzonejs service.
+   * @param \Drupal\Core\Session\AccountProxyInterface $current_user
+   *   The current user service.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler intarface.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, EventDispatcherInterface $event_dispatcher, EntityManagerInterface $entity_manager, DropzoneJsUploadSaveInterface $dropzonejs_upload_save, AccountProxyInterface $current_user, ModuleHandlerInterface $module_handler) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $event_dispatcher, $entity_manager, $dropzonejs_upload_save, $current_user);
+    $this->moduleHandler = $module_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('event_dispatcher'),
+      $container->get('entity.manager'),
+      $container->get('dropzonejs.upload_save'),
+      $container->get('current_user'),
+      $container->get('module_handler')
+    );
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'media_entity_bundle' => '',
+    ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submit(array &$element, array &$form, FormStateInterface $form_state) {
+    $files = [];
+    $media_entities = [];
+    $upload = $form_state->getValue('upload');
+    $config = $this->getConfiguration();
+    $user = \Drupal::currentUser();
+    /** @var \Drupal\media_entity\MediaBundleInterface $bundle */
+    $bundle = $this->entityManager
+      ->getStorage('media_bundle')
+      ->load($this->configuration['media_entity_bundle']);
+
+    // First save the file.
+    foreach ($upload['uploaded_files'] as $uploaded_file) {
+      $file = $this->dropzoneJsUploadSave->saveFile($uploaded_file['path'], $config['settings']['upload_location'], $config['settings']['extensions'], $user);
+
+      if ($file) {
+        $file->setPermanent();
+        $file->save();
+
+        // Now save the media entity.
+        if ($this->moduleHandler->moduleExists('media_entity')) {
+          /** @var \Drupal\media_entity\MediaInterface $media_entity */
+          $media_entity = $this->entityManager->getStorage('media')->create([
+            'bundle' => $bundle->id(),
+            $bundle->getTypeConfiguration()['source_field'] => $file,
+          ]);
+          $media_entity->save();
+          $media_entities[] = $media_entity;
+        }
+        else {
+          drupal_set_message(t('The media entity was not saved, because the media_entity module is not enabled.'));
+        }
+      }
+    }
+
+    if (!empty(array_filter($media_entities))) {
+      $this->selectEntities($media_entities);
+      $this->clearFormValues($element, $form_state);
+    }
+  }
+}