ISTWCMS-4104: fixing image_src and og_image metatags

config/install/metatag.metatag_defaults.node.yml

@@ -6,13 +6,13 @@ label: Content
 tags:
   description: '[node:field_uw_meta_description]'
   title: '[current-page:title] | [site:name]'
-  image_src: '[node:field_uw_meta_image:entity:field_media_image], https://uwaterloo.ca/university-of-waterloo-logo-152.png'
+  image_src: '[node:field_uw_meta_image:entity:field_media_image]'
   canonical_url: '[current-page:url:absolute]'
   content_language: '[node:langcode]'
   og_description: '[current-page:metatag:description]'
   og_updated_time: '[node:changed:custom:c]'
   og_title: '[current-page:metatag:title]'
-  og_image: '[node:field_uw_meta_image:entity:field_media_image], https://uwaterloo.ca/university-of-waterloo-logo-152.png'
+  og_image: '[node:field_uw_meta_image:entity:field_media_image]'
   og_locale: '[current-page:metatag:content_language]_CA'
   og_url: '[current-page:url:absolute]'
   twitter_cards_type: summary_large_image

uw_cfg_common.module

@@ -12,6 +12,22 @@ use Drupal\uw_cfg_common\Service\UWService;
 use Drupal\webform\WebformInterface;
 use Drupal\webform\WebformSubmissionStorageInterface;
 
+/**
+ * Implements hook_metatags_alter().
+ */
+function uw_cfg_common_metatags_alter(array &$metatags, array $context) {
+
+  // Get the node entity.
+  $entity = $context['entity'];
+
+  // If there is no associated image, add the fall back university
+  // logo to image_src and og_image tags.
+  if (!$entity->field_uw_meta_image->target_id) {
+    $$metatags['image_src'] = 'https://uwaterloo.ca/university-of-waterloo-logo-152.png';
+    $metatags['og_image'] = 'https://uwaterloo.ca/university-of-waterloo-logo-152.png';
+  }
+}
+
 /**
  * Implements hook_entity_presave().
  */