Upload a zip file with newforms

from cStringIO import StringIO
import zipfile

from django import newforms as forms
from zippers.upload.models import QueuedImageSet # The model that uses the zipfile (has a FileField called 'zip_file')

class ZipUploadForm(forms.Form):
	
	zip_file = forms.Field( widget=forms.FileInput() )
	owner = forms.CharField( max_length=88 )
	
	def clean_zipfile(zip_file):
		if zip_file.get('content-type') != 'application/zip':
			msg = 'File upload must be a valid ZIP archive.'
			raise forms.ValidationError( msg )
		else:
			try:
				zip = zipfile.ZipFile( StringIO( zip_file['content'] ) )
			except:
				raise forms.ValidationError( "Could not unzip file." )
			bad_file = zip.testzip()
			zip.close()
			del zip
			if bad_file:
				raise forms.ValidationError( msg )
		return zip_file # Return the clean zip_file
			
	# The line below hooks the function above into the base form.
	# When the form calls full_clean() it will automatically clean the 
        # zip_file field and add it to the form's clean_data dictionary.
	zip_file.clean = clean_zipfile
					
	def save(self):
		owner = self.clean_data['owner']
                # Get the cleaned zip_file stuff
		filename = self.clean_data['zip_file']['filename']
		zipdata = self.clean_data['zip_file']['content']
		q = QueuedImageSet(file_owner=owner)
		q.save_zip_file_file(filename, zipdata)
		q.save()