Issue #3314800: Allow users to see latest changes in frontend after adding/updating content

 * General functions and hook implementations.

 */

use Drupal\Core\Url;

use Drupal\Core\Form\FormStateInterface;

/**

 * Implements hook_trusted_redirect_hosts_alter().

 */

    ->getFrontendBaseUrl();

  $trusted_hosts[] = parse_url($frontend_base_url, PHP_URL_HOST);

}

/**

 * Implements hook_form_BASE_FORM_ID_alter().

 */

function lupus_decoupled_ce_api_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // Add new submit handler for adding ?auth=1 after editing a node.

  $form['actions']['submit']['#submit'][] = '_lupus_decoupled_ce_api_form_submit_add_auth';

}

/**

 * Add ?auth=1 after saving a node.

 *

 * @param array $form

 *   Form array.

 * @param \Drupal\Core\Form\FormStateInterface $form_state

 *   Form state object.

 */

function _lupus_decoupled_ce_api_form_submit_add_auth(array &$form, FormStateInterface $form_state) {

  $url = $form_state->getRedirect();

  if (!empty($url)) {

    $entity = $form_state->getFormObject()->getEntity();

    $url = $entity->toUrl();

    // Add an "auth=1" query-parameter so a static-generated frontend would

    // do an API-call to fetch the latest content. This ensures editors can

    // see their changes immediately when being redirected to the frontend.

    $url->setOption('query', ['auth' => 1]);

    $form_state->setRedirectUrl($url);

  }

}