protected newsletter inscription form with honeypot

web/modules/custom/materio_simplenews/materio_simplenews.module

@@ -1,15 +1,33 @@
 <?php
 
+use Drupal\Core\Form\FormStateInterface;
+
 function materio_simplenews_entity_type_alter(array &$entity_types) {
   $entity_types['simplenews_subscriber']->setFormClass('materio_block', '\Drupal\materio_simplenews\Form\MaterioSubscriptionsBlockForm');
 }
 
+/**
+ * Implements hook_form_alter().
+ *
+ * Forces Honeypot protection on simplenews subscription block forms
+ * (form ID includes a dynamic block unique_id, e.g.
+ * simplenews_subscriptions_block_footersimplenewssubscriptionblock).
+ * This can never appear as a checkbox on Honeypot's own settings form
+ * (which only lists a fixed set of core/contact/node/comment forms), so
+ * config-based protection would silently disappear if that settings
+ * form is ever saved. Applying it here in code makes it permanent and
+ * covers any future block instance of this type automatically.
+ */
+function materio_simplenews_form_alter(&$form, FormStateInterface $form_state, $form_id) {
+  if (strpos($form_id, 'simplenews_subscriptions_block_') === 0 && \Drupal::moduleHandler()->moduleExists('honeypot')) {
+    \Drupal::service('honeypot')->addFormProtection($form, $form_state, ['honeypot', 'time_restriction']);
+  }
+}
 
 /**
   * Implements hook_form_alter().
   */
 // node_simplenews_issue_edit_form
-// function materio_simplenews_form_alter(&$form, &$form_state, $form_id) {
 function materio_simplenews_form_node_simplenews_issue_form_alter(&$form, &$form_state, $form_id) {
   if(isset($_REQUEST['newsletter'])){
     $news_id = $_REQUEST['newsletter'];