function FileItem::validateExtensions

Form API callback.

This function is assigned as an #element_validate callback in fieldSettingsForm().

This doubles as a convenience clean-up function and a validation routine. Commas are allowed by the end-user, but ultimately the value will be stored as a space-separated list for compatibility with file_validate_extensions().

File

core/modules/file/src/Plugin/Field/FieldType/FileItem.php, line 258

Class

FileItem

Plugin implementation of the 'file' field type.

Namespace

Code

public static function validateExtensions($element, FormStateInterface $form_state) {
    if (!empty($element['#value'])) {
        $extensions = preg_replace('/([, ]+\\.?)/', ' ', trim(strtolower($element['#value'])));
        $extension_array = array_unique(array_filter(explode(' ', $extensions)));
        $extensions = implode(' ', $extension_array);
        if (!preg_match('/^([a-z0-9]+([._][a-z0-9])* ?)+$/', $extensions)) {
            $form_state->setError($element, new TranslatableMarkup("The list of allowed extensions is not valid. Allowed characters are a-z, 0-9, '.', and '_'. The first and last characters cannot be '.' or '_', and these two characters cannot appear next to each other. Separate extensions with a comma or space."));
        }
        else {
            $form_state->setValueForElement($element, $extensions);
        }
        // If insecure uploads are not allowed and txt is not in the list of
        // allowed extensions, ensure that no insecure extensions are allowed.
        if (!in_array('txt', $extension_array, TRUE) && !\Drupal::config('system.file')->get('allow_insecure_uploads')) {
            foreach ($extension_array as $extension) {
                if (preg_match(FileSystemInterface::INSECURE_EXTENSION_REGEX, 'test.' . $extension)) {
                    $form_state->setError($element, new TranslatableMarkup('Add %txt_extension to the list of allowed extensions to securely upload files with a %extension extension. The %txt_extension extension will then be added automatically.', [
                        '%extension' => $extension,
                        '%txt_extension' => 'txt',
                    ]));
                    break;
                }
            }
        }
    }
}