public function display_uploaded_file($file)
    {
        if (empty($file)) {
            return;
        }

        $file = $this->plugins->exec_hook('attachment_display', $file);

        if ($file['status']) {
            if (empty($file['size'])) {
                $file['size'] = $file['data'] ? strlen($file['data']) : @filesize($file['path']);
            }

            // generate image thumbnail for file browser in HTML editor
            if (!empty($_GET['_thumbnail'])) {
                $temp_dir       = $this->config->get('temp_dir');
                $thumbnail_size = 80;
                $mimetype       = $file['mimetype'];
                $file_ident     = $file['id'] . ':' . $file['mimetype'] . ':' . $file['size'];
                $cache_basename = $temp_dir . '/' . md5($file_ident . ':' . $this->user->ID . ':' . $thumbnail_size);
                $cache_file     = $cache_basename . '.thumb';

                // render thumbnail image if not done yet
                if (!is_file($cache_file)) {
                    if (!$file['path']) {
                        $orig_name = $filename = $cache_basename . '.tmp';
                        file_put_contents($orig_name, $file['data']);
                    }
                    else {
                        $filename = $file['path'];
                    }

                    $image = new rcube_image($filename);
                    if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
                        $mimetype = 'image/' . $imgtype;

                        if ($orig_name) {
                            unlink($orig_name);
                        }
                    }
                }

                if (is_file($cache_file)) {
                    // cache for 1h
                    $this->output->future_expire_header(3600);
                    header('Content-Type: ' . $mimetype);
                    header('Content-Length: ' . filesize($cache_file));

                    readfile($cache_file);
                    exit;
                }
            }

            header('Content-Type: ' . $file['mimetype']);
            header('Content-Length: ' . $file['size']);

            if ($file['data']) {
                echo $file['data'];
            }
            else if ($file['path']) {
                readfile($file['path']);
            }
        }
    }