[Zope-dev] Uploading an object's content via FTP

Hi, I made a CMF portal_type class based on python product. This contains a Photoshop file and some dedicated related services. Users may upload Photoshop files via HTTP. This works with small files but when a user uploads a big file (8 Mb and more) through HTTP, this stalls the server. So I need to provide the user an alternate way to upload the object's content with an FTP client. Where should I start to get this working ? Examples somewhere ? How can I programmatically know the port number for Zope FTP ? How can I catch "FTP upload complete" event ? Thanks in advance. --Gilles