nginx-lua and nginx upload module

[strawman]

Hi all,

I'm hoping to write an nginx-lua script which handles file uploads from
the nginx upload module.  I can do this fine using an external backend
and the upload_pass directive, but the lua module has no functionality
for parsing the multipart form data that this generates.  I've also
tried accessing the $upload_file_name, $upload_tmp_path etc. variables
generated by the upload module directly, but I don't seem to be able to
access these outside of the upload_set_form_field directive.

Is there any way to get the contents of those variables into a lua
handler in a form that can be easily parsed?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,219085,219085#msg-219085