Add templates for license_attribution view mode.

media_attribution.module

@@ -78,6 +78,19 @@ function media_attribution_modules_installed($modules) {
   media_attribution_load_default_licenses();
 }
 
+function media_attribution_preprocess_field__paragraph__field_attribution_author__license_attribution(&$variables) {
+  $variables['source_prefix'] = \Drupal::translation()->translate('by');
+}
+
+function media_attribution_preprocess_paragraph__license_attribution__license_attribution(&$variables) {
+  $variables['license_prefix'] = \Drupal::translation()->translate('Licensed under');
+
+  $referencedEntity = $variables['elements']['field_license']['#items']
+    ->first()->get('entity')->getTarget()->getValue();
+
+  $variables['license_link'] = $referencedEntity->get('field_license_link')->first()->view();
+}
+
 /**
  * Implementation of hook_preprocess_entity_embed_container().
  *
@@ -155,3 +168,16 @@ function media_attribution_load_default_licenses() {
   }
 }
 
+function media_attribution_theme() {
+  return [
+    'paragraph__license_attribution__license_attribution' => [
+      'base hook' => 'paragraph',
+    ],
+    'field__paragraph__field_attribution_source__license_attribution' => [
+      'base hook' => 'field',
+    ],
+    'field__paragraph__field_attribution_author__license_attribution' => [
+      'base hook' => 'field',
+    ],
+  ];
+}

templates/field--paragraph--field-attribution-author--license-attribution.html.twig

@@ -0,0 +1 @@
+{{ source_prefix }} {{ items.0 }}

templates/field--paragraph--field-attribution-source--license-attribution.html.twig

@@ -0,0 +1 @@
+{{ items.0 }}

templates/paragraph--license-attribution--license-attribution.html.twig

@@ -0,0 +1,2 @@
+&ldquo;<cite>{{ elements.field_attribution_source.0 }}</cite>&rdquo; {{ elements.field_attribution_author }}.
+ <span class="license-prefix"> {{ license_prefix }} {{ license_link }}</span>