Question

I am trying to write a Python script to POST a multipart form to a site that requires authentication through CAS.

There are two approaches that both solve part of the problem:

1. The Python requests library works well for submitting multipart forms.

2. There is caslib, with a login function. It returns an OpenerDirector that can presumably be used for further requests.

Unfortunately, I can’t figure out how to get a complete solution out what I have so far.
There are just some ideas from a couple hours of research; I am open to just about any solution that works.

Thanks for the help.

Answer 1

You could use poster to prepare multipart/form-data. Try to pass poster’s opener to the caslib and use caslib’s opener to make requests (not tested):

import urllib2

import caslib
import poster.encode
import poster.streaminghttp

opener = poster.streaminghttp.register_openers()
r, opener = caslib.login_to_cas_service(login_url, username, password,
                                        opener=opener)    
params = {'file': open("test.txt", "rb"), 'name': 'upload test'}
datagen, headers = poster.encode.multipart_encode(params)
response = opener.open(urllib2.Request(upload_url, datagen, headers))
print response.read()