refactor(SLB-458): preview link konami code (#1567)

Author: colorfield

packages/composer/amazeelabs/silverback_preview_link/silverback_preview_link.module

@@ -53,7 +53,8 @@ function silverback_preview_link_theme(array $existing, string $type, string $th
         'preview_url' => NULL,
         'preview_qr_code_url' => NULL,
         'expiry_description' => NULL,
-        'actions_description' => NULL
+        'actions_description' => NULL,
+        'display_gif' => FALSE,
       ],
     ],
   ];

packages/composer/amazeelabs/silverback_preview_link/src/Form/PreviewLinkForm.php

@@ -153,6 +153,7 @@ public function buildForm(array $form, FormStateInterface $form_state, RouteMatc
     $qrCodeUrlString = NULL;
     $actionsDescription = NULL;
     $previewLinkHasExpired = $remainingSeconds === 0;
+    $displayGif = \Drupal::state()->get('silverback_easter_mode') === '↑↑↓↓←→←→BA';
 
     if ($isNewToken) {
       $expiryDescription = $this->t('Expires @lifetime after creation.', [
@@ -192,6 +193,7 @@ public function buildForm(array $form, FormStateInterface $form_state, RouteMatc
       '#preview_qr_code_url' => $qrCodeUrlString,
       '#expiry_description' => $expiryDescription,
       '#actions_description' => $actionsDescription,
+      '#display_gif' => $displayGif,
     ];
 
     if (!$isNewToken) {

packages/composer/amazeelabs/silverback_preview_link/templates/preview-link.html.twig

@@ -16,7 +16,7 @@
       </div>
     </div>
   {% endif %}
-  {% if preview_link_has_expired %}
+  {% if preview_link_has_expired and display_gif %}
     <iframe src="https://giphy.com/embed/CZGcUfnAy3ayJw2eZX" width="480" height="398" style="" frameBorder="0" class="giphy-embed" allowFullScreen></iframe>
   {% endif %}
   {% if preview_qr_code_url is not empty and not preview_link_has_expired %}