Issue #3494284: Allow to use key module for Sendgrid API key

src/Form/SettingsForm.php

@@ -3,6 +3,7 @@
 namespace Drupal\sendgrid\Form;
 
 use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Link;
@@ -23,22 +24,31 @@ class SettingsForm extends ConfigFormBase {
    */
   protected $filterManager;
 
+  /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
   /**
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('plugin.manager.filter')
+      $container->get('plugin.manager.filter'),
+      $container->get('module_handler')
     );
   }
 
   /**
    * {@inheritdoc}
    */
-  public function __construct(ConfigFactoryInterface $config_factory, FilterPluginManager $filter_manager) {
+  public function __construct(ConfigFactoryInterface $config_factory, FilterPluginManager $filter_manager, ModuleHandlerInterface $module_handler) {
     parent::__construct($config_factory);
     $this->filterManager = $filter_manager;
+    $this->moduleHandler = $module_handler;
   }
 
   /**
@@ -72,6 +82,11 @@ class SettingsForm extends ConfigFormBase {
       ]),
       '#default_value' => $config->get('api_key'),
     ];
+    // Add key_select element if key module is enabled.
+    if ($this->moduleHandler->moduleExists('key')) {
+      $form['api_key']['#type'] = 'key_select';
+      $form['api_key']['#key_filters'] = ['type' => 'authentication'];
+    }
 
     $form['debug_mode'] = [
       '#title' => $this->t('Enable Debug Mode'),