Add enclosure field.

Author: grasmash

README.md

@@ -3,8 +3,17 @@ Drupal 8 module for providing <itunes:*> tags via Views RSS.
 # Set up
 
 1. Create a new view with a 'feed' display.
-1. Add the entity fields that will be rendered as iTunes elements. E.g., add the file field that should be rendered as the <enclosure>.
+1. Add the entity fields that will be rendered as iTunes elements. E.g., add the file field that should be rendered as the `<enclosure>`.
 1. Select "iTunes RSS Feed" as the display __format__.
 1. Set <channel> settings under settings for "iTunes RSS Feed".
 1. Select "iTunes Fields" under format's __show__ setting.
 1. Set the <item> settings under settings for "iTunes Fields".
+
+# Customize
+
+You may customize the output using Drupal's core theming system. The following twig templates may be overridden:
+
+* views-view-itunes-rss.html.twig
+* views-view-row-rss.html.twig
+
+The following preprocessor may be overridden: `template_preprocess_views_view_itunes_rss()`.

itunes_rss.module

@@ -34,14 +34,11 @@ function itunes_rss_theme() {
  *   - rows: The raw row data.
  */
 function template_preprocess_views_view_itunes_rss(&$variables) {
-  //   \Drupal::moduleHandler()->loadInclude('views', 'inc', 'views.theme');
   template_preprocess_views_view_rss($variables);
 
   $view  = $variables['view'];
   $items = $variables['rows'];
   $style = $view->style_plugin;
-
-  // may need to create getCategory() on viewsRss.
+  $variables['image_url'] = $style->getImage();
   $variables['itunes_category'] = $style->options['category'];
-
 }

src/Plugin/views/row/ItunesRssFields.php

@@ -3,6 +3,8 @@
 namespace Drupal\itunes_rss\Plugin\views\row;
 
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\file\Entity\File;
+use Drupal\file\Plugin\Field\FieldType\FileFieldItemList;
 use Drupal\views\Plugin\views\row\RssFields;
 
 /**
@@ -23,7 +25,7 @@ class ItunesRssFields extends RssFields {
    */
   protected function defineOptions() {
     $options = parent::defineOptions();
-
+    $options['enclosure_field'] = ['default' => ''];
     foreach ($this->getItunesItemFields() as $field) {
       $options['itunes']['contains'][$this->getItunesFieldMachineName($field)] = ['default' => ''];
     }
@@ -92,6 +94,14 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
     $view_fields_labels = $this->displayHandler->getFieldLabels();
     $view_fields_labels = array_merge($initial_labels, $view_fields_labels);
 
+    $form['enclosure_field'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Enclosure field'),
+      '#description' => $this->t('Describes a media object that is attached to the item. This must be a file field.'),
+      '#options' => $view_fields_labels,
+      '#default_value' => $this->options['enclosure_field'],
+    ];
+
     $form['itunes'] = [
       '#type' => 'details',
       '#title' => $this->t('iTunes fields'),
@@ -123,6 +133,28 @@ public function render($row) {
       $row_index = 0;
     }
     $item = $build['#row'];
+
+    if ($this->options['enclosure_field']) {
+      $field_name = $this->options['enclosure_field'];
+      $entity = $this->view->result[$row_index]->_entity;
+      $enclosure = $entity->$field_name;
+      if ($enclosure instanceof FileFieldItemList) {
+        $value = $enclosure->getValue();
+        $file = File::load($value[0]['target_id']);
+        $item->elements[] = [
+          'key' => 'enclosure',
+          'attributes' => [
+            // In RSS feeds, it is necessary to use absolute URLs. The 'url.site'
+            // cache context is already associated with RSS feed responses, so it
+            // does not need to be specified here.
+            'url' => file_create_url($file->getFileUri()),
+            'length' => $file->getSize(),
+            'type' => $file->getMimeType(),
+          ]
+        ];
+      }
+    }
+
     $fields = $this->getItunesItemFields();
 
     // Render boolean fields as yes/no.