wxt-8.x-3.011/modules/custom/wxt_ext/wxt_ext_media/src/Form/AddByUrlForm.php

<?php

namespace Drupal\wxt_ext_media\Form;

use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\media_library\Form\AddFormBase;

/**
 * Provides a form for adding URL-based media in the media library.
 *
 * Leveraged from code provided by Acquia for the Lightning distribution.
 *
 * @internal
 *   This is an internal part of WxT Extend Media and may be changed or removed
 *   at any time, in any way, without warning. External code should not
 *   instantiate or depend on this class!
 */
final class AddByUrlForm extends AddFormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return $this->getBaseFormId() . '_instagram';
  }

  /**
   * {@inheritdoc}
   */
  protected function buildInputElement(array $form, FormStateInterface $form_state) {
    // Add a container to group the input elements for styling purposes.
    $form['container'] = [
      '#type' => 'container',
    ];

    $form['container']['url'] = [
      '#type' => 'url',
      '#title' => $this->t('Add @type via URL', [
        '@type' => $this->getMediaType($form_state)->label(),
      ]),
      '#required' => TRUE,
      '#attributes' => [
        'placeholder' => 'https://',
      ],
    ];

    $form['container']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Add'),
      '#button_type' => 'primary',
      '#submit' => ['::addButtonSubmit'],
      // @todo Move validation in https://www.drupal.org/node/2988215
      '#ajax' => [
        'callback' => '::updateFormCallback',
        'wrapper' => 'media-library-wrapper',
        // Add a fixed URL to post the form since AJAX forms are automatically
        // posted to <current> instead of $form['#action'].
        // @todo Remove when https://www.drupal.org/project/drupal/issues/2504115
        //   is fixed.
        'url' => Url::fromRoute('media_library.ui'),
        'options' => [
          'query' => $this->getMediaLibraryState($form_state)->all() + [
            FormBuilderInterface::AJAX_FORM_REQUEST => TRUE,
          ],
        ],
      ],
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function addButtonSubmit(array $form, FormStateInterface $form_state) {
    $this->processInputValues([$form_state->getValue('url')], $form, $form_state);
  }

}