public static function ManagedFile::valueCallback in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/file/src/Element/ManagedFile.php \Drupal\file\Element\ManagedFile::valueCallback()

Determines how user input is mapped to an element's #value property.

Parameters

array $element: An associative array containing the properties of the element.

mixed $input: The incoming input to populate the form element. If this is FALSE, the element's default value should be returned.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

Return value

mixed The value to assign to the element.

Overrides FormElement::valueCallback

1 call to ManagedFile::valueCallback()

FileWidget::value in core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php

Form API callback. Retrieves the value for the file_generic field element.

File

core/modules/file/src/Element/ManagedFile.php, line 60

Class

ManagedFile

Provides an AJAX/progress aware widget for uploading and saving a file.

Namespace

Drupal\file\Element

Code

public static function valueCallback(&$element, $input, FormStateInterface $form_state) {

  // Find the current value of this field.
  $fids = !empty($input['fids']) ? explode(' ', $input['fids']) : [];
  foreach ($fids as $key => $fid) {
    $fids[$key] = (int) $fid;
  }
  $force_default = FALSE;

  // Process any input and save new uploads.
  if ($input !== FALSE) {
    $input['fids'] = $fids;
    $return = $input;

    // Uploads take priority over all other values.
    if ($files = file_managed_file_save_upload($element, $form_state)) {
      if ($element['#multiple']) {
        $fids = array_merge($fids, array_keys($files));
      }
      else {
        $fids = array_keys($files);
      }
    }
    else {

      // Check for #filefield_value_callback values.
      // Because FAPI does not allow multiple #value_callback values like it
      // does for #element_validate and #process, this fills the missing
      // functionality to allow File fields to be extended through FAPI.
      if (isset($element['#file_value_callbacks'])) {
        foreach ($element['#file_value_callbacks'] as $callback) {
          $callback($element, $input, $form_state);
        }
      }

      // Load files if the FIDs have changed to confirm they exist.
      if (!empty($input['fids'])) {
        $fids = [];
        foreach ($input['fids'] as $fid) {
          if ($file = File::load($fid)) {
            $fids[] = $file
              ->id();
            if (!$file
              ->access('download')) {
              $force_default = TRUE;
              break;
            }

            // Temporary files that belong to other users should never be
            // allowed.
            if ($file
              ->isTemporary()) {
              if ($file
                ->getOwnerId() != \Drupal::currentUser()
                ->id()) {
                $force_default = TRUE;
                break;
              }
              elseif (\Drupal::currentUser()
                ->isAnonymous()) {
                $token = NestedArray::getValue($form_state
                  ->getUserInput(), array_merge($element['#parents'], [
                  'file_' . $file
                    ->id(),
                  'fid_token',
                ]));
                $file_hmac = Crypt::hmacBase64('file-' . $file
                  ->id(), \Drupal::service('private_key')
                  ->get() . Settings::getHashSalt());
                if ($token === NULL || !hash_equals($file_hmac, $token)) {
                  $force_default = TRUE;
                  break;
                }
              }
            }
          }
        }
        if ($force_default) {
          $fids = [];
        }
      }
    }
  }

  // If there is no input or if the default value was requested above, use the
  // default value.
  if ($input === FALSE || $force_default) {
    if ($element['#extended']) {
      $default_fids = isset($element['#default_value']['fids']) ? $element['#default_value']['fids'] : [];
      $return = isset($element['#default_value']) ? $element['#default_value'] : [
        'fids' => [],
      ];
    }
    else {
      $default_fids = isset($element['#default_value']) ? $element['#default_value'] : [];
      $return = [
        'fids' => [],
      ];
    }

    // Confirm that the file exists when used as a default value.
    if (!empty($default_fids)) {
      $fids = [];
      foreach ($default_fids as $fid) {
        if ($file = File::load($fid)) {
          $fids[] = $file
            ->id();
        }
      }
    }
  }
  $return['fids'] = $fids;
  return $return;
}