[Mailman-Developers] [Mailman-Users] handler to auto detach attachment and link it to a website keeping html

Sylvain Viart sylvain at opensource-expert.com
Fri Apr 18 18:48:37 CEST 2014

Coding question.

A bit of context:

Goal is to develop a custom handler to perform:

  * detach all attachments
  * post detached content somewhere available on http
  * modify the content of the original email, keeping original html,
    adding an html link to the moved document
  * adding a small clip image as an attachment symbol as an embed object

Le 16/04/2014 16:01, Mark Sapiro a écrit :
> <https://docs.python.org/2/library/email.mime.html> to create new 
> sub-parts and use the Message.attach() method to attach them. 

How can I replace the part which contain the html part, by a new one 
which will become :

 >> Content-Type: multipart/related
 >>>>Content-Type: text/html;
 >>>> Content-Type: image/png; name="clip-24.png"

The text/html is the old one.

Adding a part is ok, but replacing it with a new one which embed the 
previous one… I dont see.

part of the code I've produced:

     if msg.is_multipart():
         syslog('debug', 'multipart message rewriting')
         related = None

         for part in msg.walk():
             ctype = part.get_content_type()
             if ctype == 'text/plain' and not part['X-Mailman-Part']:
                 new_footer = txt_attacht_replace + footer_attach
                 part.set_payload(part.get_payload() + new_footer)

             elif ctype == 'text/html':
                 related = MIMEMultipart('related')
                 clip = MIMEText(attach_clip)
                 clip.add_header('Content-Disposition', 'inline')
                 clip.add_header('Content-ID', '<part1.%d>' % 123412)
                 clip['Content-Transfer-Encoding'] = 'base64'
                 del clip['Content-type']
                 del clip['Content-transfer-encoding']
                 clip['Content-type'] = 'image/png; 
                 clip['Content-transfer-encoding'] = 'base64'

                 html_footer = html_attachment_holder % 
{'html_attachment_clip_tpl': html_footer_attach}
                 html_footer += '</body>'
                 old_content = part.get_payload()
                 new_content = re.sub(r'</body>', html_footer, old_content)


                 # WRONG
                 del part


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