protected function FileUploadHandler::handleExtensionValidation in Drupal 10

Gets the list of allowed extensions and updates the validators.

This will add an extension validator to the list of validators if one is not set.

If the extension validator is set, but no extensions are specified, it means all extensions are allowed, so the validator is removed from the list of validators.

Parameters

array $validators: The file validators in use.

Return value

string The space delimited list of allowed file extensions.

1 call to FileUploadHandler::handleExtensionValidation()

FileUploadHandler::handleFileUpload in core/modules/file/src/Upload/FileUploadHandler.php

Creates a file from an upload.

File

core/modules/file/src/Upload/FileUploadHandler.php, line 309

Class

FileUploadHandler

Handles validating and creating file entities from file uploads.

Namespace

Drupal\file\Upload

Code

protected function handleExtensionValidation(array &$validators) : string {

  // Build a list of allowed extensions.
  if (isset($validators['file_validate_extensions'])) {
    if (!isset($validators['file_validate_extensions'][0])) {

      // If 'file_validate_extensions' is set and the list is empty then the
      // caller wants to allow any extension. In this case we have to remove the
      // validator or else it will reject all extensions.
      unset($validators['file_validate_extensions']);
    }
  }
  else {

    // No validator was provided, so add one using the default list.
    // Build a default non-munged safe list for
    // \Drupal\system\EventSubscriber\SecurityFileUploadEventSubscriber::sanitizeName().
    $validators['file_validate_extensions'] = [
      self::DEFAULT_EXTENSIONS,
    ];
  }
  return $validators['file_validate_extensions'][0] ?? '';
}