Issue #3327827: Provide a block for running cron from a dashboard

Closes #3327827

core/modules/system/src/Plugin/Block/CronStatusBlock.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\system\Plugin\Block;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Access\AccessResultInterface;
+use Drupal\Core\Block\Attribute\Block;
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Security\TrustedCallbackInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\system\Form\CronForm;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a block to display Cron status.
+ */
+#[Block(
+  id: "system_cron_status_block",
+  admin_label: new TranslatableMarkup("Cron status")
+)]
+class CronStatusBlock extends BlockBase implements ContainerFactoryPluginInterface, TrustedCallbackInterface {
+
+  /**
+   * Constructs a new CronStatusBlock instance.
+   *
+   * @param array $configuration
+   *   An array of configuration settings.
+   * @param mixed $plugin_id
+   *   The plugin ID for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
+   *   The configuration factory service.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, protected ConfigFactoryInterface $configFactory) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('config.factory'),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build(): array {
+    $build = [];
+
+    $build['cron_status'] = [
+      '#lazy_builder' =>
+        [self::class . '::lazyBuilder', []],
+    ];
+
+    return $build;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function blockAccess(AccountInterface $account): AccessResultInterface {
+    return AccessResult::allowedIfHasPermission($account, 'administer site configuration');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function trustedCallbacks(): array {
+    return [
+      'lazyBuilder',
+    ];
+  }
+
+  /**
+   * #lazy_builder callback; builds the cron form block.
+   *
+   * @return array
+   *   A render array with the cron form.
+   */
+  public static function lazyBuilder(): array {
+    $build = \Drupal::service('form_builder')->getForm(CronForm::class);
+
+    // Hide parts of the form out of the block scope.
+    $build['cron']['#access'] = FALSE;
+    $build['actions']['#access'] = FALSE;
+
+    return $build;
+  }
+
+}