* This form handles file name validation for accessing design files.
 */
public class FileAccessForm {

    /** The name of the file to access (required) */
    @Required
    public String fileName;

    /**
     * Default constructor for file access form.
     * Creates a new instance with default values.
     */
    public FileAccessForm() {
        // Default constructor
    }

     * Download a design file.
     * @param form The file access form.
     * @return The stream response.
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public StreamResponse download(final FileAccessForm form) {
        final File file = getTargetFile(form.fileName).get();
        if (file == null) {
            throwValidationError(messages -> messages.addErrorsTargetFileDoesNotExist(GLOBAL, form.fileName), this::asListHtml);