#3522525 Remove event subscriber as we are using field validation.

alt_text_validation.services.yml

@@ -23,10 +23,6 @@ services:
     arguments:
       - '@config.factory'
       - '@logger.channel.alt_text_validation'
-  alt_text_validation.event_subscriber:
-    class: Drupal\alt_text_validation\EventSubscriber\MediaEventSubscriber
-    tags:
-      - { name: event_subscriber }
   logger.channel.alt_text_validation:
     parent: logger.channel_base
     arguments: [ 'alt_text_validation' ]

src/EventSubscriber/MediaEventSubscriber.php

-<?php
-
-namespace Drupal\alt_text_validation\EventSubscriber;
-
-use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\StringTranslation\StringTranslationTrait;
-use Drupal\image\Plugin\Field\FieldWidget\ImageWidget;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-
-/**
- * Theme Event Subscriber.
- */
-class MediaEventSubscriber implements EventSubscriberInterface {
-
-  use StringTranslationTrait;
-
-  /**
-   * Max length for alt text.
-   */
-  const MAX_LENGTH = 150;
-
-  /**
-   * Boolean for whether to count HTML characters.
-   */
-  const COUNT_HTML = FALSE;
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function getSubscribedEvents(): array {
-    return [
-      // FieldHookEvents::WIDGET_SINGLE_ELEMENT_FORM_ALTER => 'formWidgetAlter',
-      // FormHookEvents::FORM_ALTER => 'formAlter',
-    ];
-  }
-
-
-  /**
-   * Widget form alter Event call.
-   *
-   * @param \Drupal\field_event_dispatcher\Event\Field\WidgetSingleElementFormAlterEvent $event
-   *   The event.
-   */
-  // public function formWidgetAlter(WidgetSingleElementFormAlterEvent $event): void {
-  //   $element = &$event->getElement();
-  //   $context = $event->getContext();
-  //   // If this is an image field type of instance.
-  //   if ($context['widget'] instanceof ImageWidget) {
-  //     $element['#process'][] = [static::class, 'imageFieldWidgetProcess'];
-  //   }
-  // }
-
-  /**
-   * Changes the alt text description to be more helpful and add validation.
-   *
-   * @param array $element
-   *   The element to change the alt text description.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The form state.
-   * @param array $form
-   *   The form.
-   *
-   * @return array
-   *   The element.
-   */
-  public static function imageFieldWidgetProcess(array $element, FormStateInterface &$form_state, array $form) {
-    if (isset($element['alt'])) {
-      $element['alt']['#description'] = t('Adding a clear and meaningful description of the image is important for accessibility.');
-      $element['alt']['#element_validate'] = [
-        [static::class, 'validateAltText'],
-      ];
-      $element['alt']['#type'] = 'textarea';
-      $element['alt']['#rows'] = 3;
-
-      // Add the textfield counter to the alt text field.
-      $position = 'after';
-      $form_id = $form['#form_id'];
-      if ($form_id === 'media_library_add_form_dropzonejs') {
-        $form_storage = $form_state->getStorage();
-        $entity = $form_storage['media'][0];
-      }
-      else {
-        /* var $form_object \Drupal\media\MediaForm */
-        $form_object = $form_state->getFormObject();
-        /* var $entity \Drupal\media\MediaInterface */
-        $entity = $form_object->getEntity();
-      }
-
-      $delta = $element['#delta'];
-
-      $keys = [$element['#entity_type']];
-      $keys[] = $entity->id() ? $entity->id() : 0;
-
-      $keys[] = $delta;
-      $keys[] = 'alt';
-
-      $key = implode('-', $keys);
-
-      $element['alt']['#attributes']['class'][] = $key;
-      $element['alt']['#attributes']['class'][] = 'textfield-counter-element';
-
-      $element['alt']['#attached']['library'][] = 'textfield_counter/counter';
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['key'][$delta] = $key;
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['maxlength'] = (int) self::MAX_LENGTH;
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['counterPosition'] = $position;
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['textCountStatusMessage'] = 'Characters remaining: <span class="remaining_count">@remaining_count</span>';
-
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['preventSubmit'] = TRUE;
-
-      $element['alt']['#attached']['drupalSettings']['textfieldCounter'][$key]['countHTMLCharacters'] = self::COUNT_HTML;
-    }
-
-    // Return the altered element.
-    return $element;
-  }
-
-  /**
-   * Custom validation of image widget alt text field.
-   *
-   * @param array $element
-   *   The image widget alt text element.
-   * @param \Drupal\Core\Form\FormStateInterface $formState
-   *   The form state.
-   */
-  public static function validateAltText(array $element, FormStateInterface $formState) {
-    // Only perform validation if the function is triggered from other places
-    // than the image process form. We don't want this validation to run when an
-    // image was just uploaded, and they haven't had an opportunity to provide
-    // the alt text. ImageWidget does this too, see ::validateRequiredFields.
-    $triggering_element = $formState->getTriggeringElement();
-    if (!empty($triggering_element['#submit']) && in_array('file_managed_file_submit', $triggering_element['#submit'], TRUE)) {
-      $formState->setLimitValidationErrors([]);
-      return;
-    }
-
-    $parents = $element['#parents'];
-    array_pop($parents);
-
-    // Back out if no image was submitted.
-    $fid_form_element = array_merge($parents, ['fids']);
-    if (empty($formState->getValue($fid_form_element))) {
-      return;
-    }
-    // @todo replace this with proper DI logger.
-    $logger = \Drupal::logger('alt_text_validation');
-    $value = $formState->getValue($element['#parents']);
-    $value_length = static::getLengthOfSubmittedValue($value);
-    if ($value_length > self::MAX_LENGTH) {
-      $formState->setErrorByName(implode('][', $element['#parents']), t('Alternative text cannot be longer than 150 characters.'));
-      $logger->error("[CC] Alternative text ({$value}) cannot be longer than 150 characters. {$value_length} characters were submitted.");
-    }
-
-    if (preg_match('/\.(jpg|jpeg|png|gif)$/i', $value)) {
-      $formState->setErrorByName(implode('][', $element['#parents']), t('Alternative text cannot contain file names.'));
-      $logger->error("[FN] Alternative text cannot contain file names. {$value} was submitted.");
-    }
-
-    if (preg_match('/(image|photo|graphic|picture) of/i', $value)) {
-      $formState->setErrorByName(implode('][', $element['#parents']), t('Alternative text cannot contain phrases like “image of”, “photo of”, “graphic of”, “picture of”, etc.'));
-      $logger->error("[RP] Alternative text cannot contain repetitive phrases. {$value} was submitted.");
-    }
-  }
-
-  /**
-   * Get the length of the submitted text value.
-   *
-   * @param string $value
-   *   The value whose length is to be calculated.
-   *
-   * @return int
-   *   The length of the value.
-   */
-  public static function getLengthOfSubmittedValue(string $value): int {
-    $parts = explode(PHP_EOL, $value);
-    $newline_count = count($parts) - 1;
-
-    if (self::COUNT_HTML) {
-      $value_length = mb_strlen($value) - $newline_count;
-    }
-    else {
-      $value_length = str_replace('&nbsp;', ' ', $value);
-      $value_length = trim($value_length);
-      $value_length = preg_replace("/(\r?\n|\r)+/", "\n", $value_length);
-      $value_length = mb_strlen(strip_tags($value_length));
-    }
-
-    return $value_length;
-  }
-
-}