simplenews_mailjet_subscriptions: added rules action to respond to unsubscribe webhook

patches/simplenews_mailjet_subscriptions__usingmailjetmodule.patch

@@ -301,6 +301,62 @@ index 98342b5..f67ba96 100644
  
      $form['add_subscription'] = [
        '#type' => 'submit',
+diff --git a/src/Plugin/RulesAction/UnsubscribeFromList.php b/src/Plugin/RulesAction/UnsubscribeFromList.php
+new file mode 100644
+index 0000000..c6a5a77
+--- /dev/null
++++ b/src/Plugin/RulesAction/UnsubscribeFromList.php
+@@ -0,0 +1,49 @@
++<?php
++
++namespace Drupal\simplenews_mailjet_subscriptions\Plugin\RulesAction;
++
++use Drupal\rules\Core\RulesActionBase;
++use Drupal\simplenews\SubscriberInterface;
++
++/**
++ * Provides a 'Unsubscribe' action.
++ *
++ * @RulesAction(
++ *   id = "rules_simplenews_mailjet_subscriptions_unsubscribe_from_list",
++ *   label = @Translation("Unsubscribe from newsletter, giving mailjet listID and email"),
++ *   category = @Translation("Simplenews Mailjet Subscriptions"),
++ *   context_definitions = {
++ *     "listID" = @ContextDefinition("integer",
++ *       label = @Translation("Mailjet list ID"),
++ *       description = @Translation("Specifies the mailjet list ID from which simplenews list will be found and email will be unsubscribed from.")
++ *     ),
++ *     "email" = @ContextDefinition("string",
++ *       label = @Translation("Subscriber email"),
++ *       description = @Translation("Specifies the email to unsubscribe.")
++ *     )
++ *   }
++ * )
++ */
++class UnsubscribeFromList extends RulesActionBase {
++
++  /**
++   * Deletes the Entity.
++   *
++   * @param integer listID
++   *    The mailjet list to unsubcsribe from.
++   *
++   * @param string email
++   *    The email to unsubcribe.
++   */
++  protected function doExecute(integer $listID, string $email) {
++    $l = $listID;
++    $e = $email;
++    \Drupal::logger('simplenews_mailjet_subscriptions')->info("Unsubscribe webhook triggered for listID: " . $listID . ", and email: " . $email . ".");
++    // find corresponding simplenews list from mailjet listID
++
++    // get subscriber entity
++
++    // unsubscribe subscriber from simplenews list
++  }
++
++}
+\ No newline at end of file
 diff --git a/src/SimplenewsMailjetSubscriptionsInterface.php b/src/SimplenewsMailjetSubscriptionsInterface.php
 index c727d26..37c082d 100644
 --- a/src/SimplenewsMailjetSubscriptionsInterface.php