too long

I'm using a plugin called jQuery file upload to upload images to a page. Currently it uploads with the original image name as the file name (IMG_1234). I need a specific format for the image name on the server (eg 1.123456.jpg)

I found this PHP code that works for changing the image name:

class CustomUploadHandler extends UploadHandler
{
    protected function trim_file_name($name, $type) {
        $name = time()."_1";
        $name = parent::trim_file_name($name, $type);
        return $name;
    }
}

When I upload an image, it is named correctly, but the link for the image preview is undefined. This prevents me from deleting the image via the plugin.

The variable data.url is undefined... If I go back to the original code that doesn't rename the image, everything works fine.

Has anyone had any experience with this plugin that could help? Thanks!

EDIT:

I've found part of the problem at least...the function to return the download link (which is also used for deletion) is giving the original file name, not the updated one. I am really new to PHP classes, so I'm not sure where the variable originates and how to fix it. I'd really appreciate any help I can get!

Here's the PHP code for that function:

protected function get_download_url($file_name, $version = null, $direct = false) {
    if (!$direct && $this->options['download_via_php']) {
        $url = $this->options['script_url']
            .$this->get_query_separator($this->options['script_url'])
            .'file='.rawurlencode($file_name);
            //  The `$file_name` variable is the original image name (`IMG_1234`), and not the renamed file.  
        if ($version) {
            $url .= '&version='.rawurlencode($version);
        }
        return $url.'&download=1';
    }
    if (empty($version)) {
        $version_path = '';
    } else {
        $version_url = @$this->options['image_versions'][$version]['upload_url'];
        if ($version_url) {
            return $version_url.$this->get_user_path().rawurlencode($file_name);
        }
        $version_path = rawurlencode($version).'/';
    }
    return $this->options['upload_url'].$this->get_user_path()
        .$version_path.rawurlencode($file_name);
}

EDIT 2: I think it has something to do with 'param_name' => 'files', in the options. Anyone know what that does?

Fixed it by editing the trim_file_name function inside UploadHandler.php instead of extending the class in index.php.