Add event prices to RSS feed for Redia app

Prices in the original feed are (mostly) displayed as raw integers in
the format "[price]" or "[low price] - [high price]". If the event is
free then there is no price element for it in the feed.

Add support for similar output in the our new implementation of the
feed by using the raw price range formatting.

web/modules/custom/dpl_redia_legacy/src/Controller/RssFeeds/EventsController.php

@@ -8,6 +8,7 @@
 use Drupal\Core\Datetime\DateFormatterInterface;
 use Drupal\Core\File\FileUrlGeneratorInterface;
 use Drupal\Core\Url;
+use Drupal\dpl_event\PriceFormatter;
 use Drupal\dpl_redia_legacy\RediaEvent;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
@@ -24,6 +25,7 @@ class EventsController extends ControllerBase {
   public function __construct(
     protected FileUrlGeneratorInterface $fileUrlGenerator,
     protected DateFormatterInterface $dateFormatter,
+    protected PriceFormatter $priceFormatter,
   ) {}
 
   /**
@@ -33,6 +35,7 @@ public static function create(ContainerInterface $container): static {
     return new static(
       $container->get('file_url_generator'),
       $container->get('date.formatter'),
+      $container->get('dpl_event.price_formatter'),
     );
   }
 
@@ -80,7 +83,7 @@ private function getItems(): array {
     $items = [];
 
     foreach ($events as $event) {
-      $items[] = new RediaEvent($event);
+      $items[] = new RediaEvent($event, $this->priceFormatter);
     }
 
     return $items;
@@ -184,6 +187,11 @@ private function buildRss(array $items, Request $request): string {
               $xml->writeElement('content-rss:booking-url', $item->bookingUrl);
             }
 
+            // Events without a price element are interpreted as free.
+            if ($item->prices) {
+              $xml->writeElement('content-rss:arrangement-price', $item->prices);
+            }
+
             $xml->writeElement('content-rss:promoted', $item->promoted);
           $xml->endElement();
         }

web/modules/custom/dpl_redia_legacy/src/RediaEvent.php

@@ -6,6 +6,7 @@
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\dpl_event\EventWrapper;
+use Drupal\dpl_event\PriceFormatter;
 use Drupal\node\NodeInterface;
 use Drupal\recurring_events\Entity\EventInstance;
 
@@ -28,6 +29,7 @@ class RediaEvent extends ControllerBase {
   public ?RediaEventMedia $media;
   public ?RediaEventMedia $mediaThumbnail;
   public ?string $bookingUrl;
+  public ?string $prices;
   // phpcs:enable
 
   /**
@@ -38,7 +40,7 @@ class RediaEvent extends ControllerBase {
    */
   public string $promoted;
 
-  public function __construct(EventInstance $event_instance) {
+  public function __construct(EventInstance $event_instance, PriceFormatter $price_formatter) {
     $event_wrapper = new EventWrapper($event_instance);
 
     $branch = $event_wrapper->getBranches()[0] ?? NULL;
@@ -73,6 +75,14 @@ public function __construct(EventInstance $event_instance) {
     $this->branch = $branch;
     $this->bookingUrl = $event_wrapper->getLink();
 
+    if (!$event_wrapper->isFreeToAttend()) {
+      $prices = $event_wrapper->getTicketPrices();
+      $this->prices = $price_formatter->formatRawPriceRange($prices);
+    }
+    else {
+      $this->prices = NULL;
+    }
+
     // In the old system, there was a way for editors to mark content a
     // promoted. However, this does not exist in the new CMS, so we wil
     // just hardcode it.