PER-10: Added new search index field for image discovery

src/Plugin/search_api/processor/IslandoraObjectImageDiscovery.php

@@ -0,0 +1,117 @@
+<?php
+
+namespace Drupal\dgi_image_discovery\Plugin\search_api\processor;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\dgi_image_discovery\ImageDiscoveryInterface;
+use Drupal\node\NodeInterface;
+use Drupal\search_api\Datasource\DatasourceInterface;
+use Drupal\search_api\Item\ItemInterface;
+use Drupal\search_api\Processor\ProcessorPluginBase;
+use Drupal\search_api\Processor\ProcessorProperty;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Get the styled image url for the islandora node.
+ *
+ * @SearchApiProcessor(
+ *   id = "islandora_object_image_discovery",
+ *   label = @Translation("Islandora Object Image Discovery"),
+ *   description = @Translation("Get the styled image url for the islandora node."),
+ *   stages = {
+ *     "add_properties" = 0,
+ *   },
+ *   locked = true,
+ *   hidden = true,
+ * )
+ */
+class IslandoraObjectImageDiscovery extends ProcessorPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The entity type manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * The DGI Image Discovery service.
+   *
+   * @var \Drupal\dgi_image_discovery\ImageDiscoveryInterface
+   */
+  protected $imageDiscovery;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    ImageDiscoveryInterface $image_discovery,
+    EntityTypeManagerInterface $entity_type_manager
+  ) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->imageDiscovery = $image_discovery;
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('dgi_image_discovery.service'),
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertyDefinitions(DatasourceInterface $datasource = NULL) {
+    $properties = [];
+
+    if (!$datasource) {
+      $definition = [
+        'label' => $this->t('Islandora Object Image Discovery'),
+        'description' => $this->t('Styled Image Url which can then be passed to the image src.'),
+        'type' => 'string',
+        'is_list' => FALSE,
+        'processor_id' => $this->getPluginId(),
+      ];
+      $properties['islandora_object_image_discovery'] = new ProcessorProperty($definition);
+    }
+
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addFieldValues(ItemInterface $item) {
+    $entity = $item->getOriginalObject()->getValue();
+    $value = NULL;
+
+    // Get the image discovery URL.
+    if (!$entity->isNew() && $entity instanceof NodeInterface) {
+      $event = $this->imageDiscovery->getImage($entity);
+      if ($event->hasMedia()) {
+        $value = $this->entityTypeManager->getStorage('image_style')->load('solr_grid_thumbnail')
+          ->buildUrl($event->getMedia()->field_media_image->entity->getFileUri());
+      }
+    }
+
+    $fields = $item->getFields(FALSE);
+    $fields = $this->getFieldsHelper()->filterForPropertyPath($fields, NULL, 'islandora_object_image_discovery');
+    foreach ($fields as $field) {
+      $field->addValue($value);
+    }
+  }
+
+}