Załączniki do e-maili Django są wysyłane jako "noname"

Question

from django.template import loader, Context 
from django.core.mail import EmailMultiAlternatives, EmailMessage 
from settings import ADBOARD_SETTINGS 
import settings 


def send_mail(mail_to, subj, message_dict, template_dict=False, mail_from=ADBOARD_SETTINGS['mail_from'], attach=False): 

    if not isinstance(mail_to, list): 
     mail_to = [mail_to] 

    if template_dict: 
     txt = loader.get_template(template_dict['txt']) 
     html = loader.get_template(template_dict['html']) 
     c = Context(message_dict or None) 
     message_txt = txt.render(c) 
     message_html = html.render(c) 
     msg = EmailMultiAlternatives(subj, message_txt, mail_from, mail_to) 
     msg.attach_alternative(message_html, "text/html") 
    else: 
     msg = EmailMessage(subj, message_dict, mail_from, mail_to) 
    if attach: 
     for one in attach: 
      msg.attach(one[0], one[1], one[2]) 
    msg.send() 

def contacts(request): 
    from choices import ContactCategoryChoices 

    if request.method == 'POST': 
     form = ContactForm(request.POST, request.FILES) 
     if form.is_valid(): 
      data = { 
       'email': form.cleaned_data.get('email'), 
       'subject': form.cleaned_data.get('subject'), 
       'message': form.cleaned_data.get('message'), 
       'category': int(form.cleaned_data.get('category')) 
      } 

      recievers = (
       (#recievers) 

      emailList = list(dict(recievers)[data.get('category')]) 

      attaches = [(upload.name, upload.read(), upload.content_type) for upload in 
         [form.cleaned_data[attach] for attach in request.FILES]] 
      send_mail(emailList, u'Письмо со страницы контактов', data, { 
       'txt': 'home/contacts/txt.html', 
       'html': 'home/contacts/html.html', 
      }, mail_from=settings.SENDER_EMAIL, attach=attaches) 
      messages.add_message(request, messages.SUCCESS, u'Сообщение отправлено') 
      form = ContactForm() 
    else: 
     form = ContactForm() 
    return render_to_response('home/contacts/index.html', {'form': form}, context_instance=RequestContext(request)) 

Jeśli dodam pliki - są wyświetlane jako "noname" w załącznikach ... Nie tylko w Gmailu. Django 1.3.1, pliki nazwane utf-8. Czy jest szansa, aby działało bez konwersji na ascii? Dopóki nie mogę go przekonwertować z powodu zapisania oryginalnych nazw plików jest bardzo ważne.

Aktualizacja:
Tymczasem nagłówek wydaje legit:

Answer 1

Ok. Zorientowaliśmy się z następującego kodu:

import mimetypes 
from email import encoders 
from email.header import Header 
from email.mime.base import MIMEBase 
from django.core.mail.message import DEFAULT_ATTACHMENT_MIME_TYPE 

class EmailMultiAlternativesWithEncoding(EmailMultiAlternatives): 
    def _create_attachment(self, filename, content, mimetype=None): 
     """ 
     Converts the filename, content, mimetype triple into a MIME attachment 
     object. Use self.encoding when handling text attachments. 
     """ 
     if mimetype is None: 
      mimetype, _ = mimetypes.guess_type(filename) 
      if mimetype is None: 
       mimetype = DEFAULT_ATTACHMENT_MIME_TYPE 
     basetype, subtype = mimetype.split('/', 1) 
     if basetype == 'text': 
      encoding = self.encoding or settings.DEFAULT_CHARSET 
      attachment = SafeMIMEText(smart_str(content, 
       settings.DEFAULT_CHARSET), subtype, encoding) 
     else: 
      # Encode non-text attachments with base64. 
      attachment = MIMEBase(basetype, subtype) 
      attachment.set_payload(content) 
      encoders.encode_base64(attachment) 
     if filename: 
      try: 
       filename = filename.encode('ascii') 
      except UnicodeEncodeError: 
       filename = Header(filename, 'utf-8').encode() # This is the important line 
      attachment.add_header('Content-Disposition', 'attachment', 
            filename=filename) 
     return attachment 

Answer 2

jak na fix wykonane w bilecie 14964:

from django.core.mail import EmailMultiAlternatives 
import mimetypes 
from django.core.mail.message import DEFAULT_ATTACHMENT_MIME_TYPE 

class UnicodeEmailMultiAlternatives(EmailMultiAlternatives): 

    def _create_attachment(self, filename, content, mimetype=None): 
     """ 
     Overrides EmailMultiAlternatives method to allow UTF8 filenames as attachments. 
     """ 
     if mimetype is None: 
      mimetype, _ = mimetypes.guess_type(filename) 
      if mimetype is None: 
       mimetype = DEFAULT_ATTACHMENT_MIME_TYPE 
     attachment = self._create_mime_attachment(content, mimetype) 
     if filename: 
      try: 
       filename = filename.encode('ascii') 
      except UnicodeEncodeError: 
       filename = ('utf-8', '', filename.encode('utf-8')) 
      attachment.add_header('Content-Disposition', 'attachment', 
            filename=filename) 
     return attachment