Re: email: Content-Disposition and linebreaks with long filenames
Martin Körner [EMAIL PROTECTED] writes: I am using email module for creating mails with attachment (and then sending via smtplib). If the name of the attachment file is longer than about 60 characters the filename is wrapped in the Content-Disposition header: Content-Disposition: attachment; filename=This is a sample file with a very long filename 0123456789.zip This leads to a wrong attachment filename in email clients - the space after filename is not shown or the client displays a special character (the linbreak or tab before 0123456789.zip). Yes, it would appear that the default Generator used by the Message object to create a textual version of a message explicitly uses tab (\t) as a continuation character rather than space - probably because it looks a little nicer when printed. Interestingly enough, the default Header continuation character is just a plain space which would work fine here. I should point out that I believe this header format could be considered correct, although I find RFC2822 a bit ambiguous on this point. It talks about runs of FWS (folding white space) in an unfolding operation as being considered a single space (section 3.2.3). However, I suppose someone might argue if runs includes a single character. I think it should, but obviously some e-mail clients disagree :-) (...) Is it possible to prevent the linebreak? Should be - two approaches I can think of (msg below is the email.Message): 1) Create your own Header object for the specific header line rather than just storing it as a string via add_header. For that specific header you can then override the default maximum line length. Something like: from email.Header import Header cd_header = Header('Content-Disposition: attachment; filename=.', maxlinelen=998) msg['Content-Disposition'] = cd_header Note that because Header defaults to a space continuation character, you could also leave maxlinelen alone and let it break the line, but since it would break with a single space it would work right in clients. 2) Use your own Generator object to generate the textual version of the message (which is when the wrapping is occurring), and during the flattening process, disable (or set a longer value for) header wrapping. Something like: Assuming fp is an output File-like object: from email.Generator import Generator g = Generator(fp) g.flatten(msg, maxheaderlen=998) (or maxheaderlen=0 to disable wrapping) -- David -- http://mail.python.org/mailman/listinfo/python-list
email: Content-Disposition and linebreaks with long filenames
Hi NG, I am using email module for creating mails with attachment (and then sending via smtplib). If the name of the attachment file is longer than about 60 characters the filename is wrapped in the Content-Disposition header: Content-Disposition: attachment; filename=This is a sample file with a very long filename 0123456789.zip This leads to a wrong attachment filename in email clients - the space after filename is not shown or the client displays a special character (the linbreak or tab before 0123456789.zip). If I use a standard email client and generate a mail with the same attachment, it creates the following header: Content-Disposition: attachment; filename=This is a sample file with a very long filename 0123456789.zip (no line break) Here is my code: msg = MIMEMultipart() msg['Subject'] = 'Test' msg['From'] = '[EMAIL PROTECTED]' msg['To'] = '[EMAIL PROTECTED]' msg.epilogue = '' # Add body part_body = MIMEText('blabla') msg.attach(part_body) # Add attachment file = 'This is a sample file with a very long filename 0123456789.zip' fp = open(file, 'rb') part_att = MIMEBase('application','zip') part_att.set_payload(fp.read()) fp.close() part_att.add_header('Content-Disposition', 'attachment', filename=file) # Encode the payload using Base64 email.Encoders.encode_base64(part_att) msg.attach(part_att) Is it possible to prevent the linebreak? Thank you Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: email: Content-Disposition and linebreaks with long filenames
* Martin Körner [EMAIL PROTECTED] wrote: I am using email module for creating mails with attachment (and then sending via smtplib). If the name of the attachment file is longer than about 60 characters the filename is wrapped in the Content-Disposition header: Content-Disposition: attachment; filename=This is a sample file with a very long filename 0123456789.zip This leads to a wrong attachment filename in email clients - the space after filename is not shown or the client displays a special character (the linbreak or tab before 0123456789.zip). Yeah, this is badly applied header folding. You can circumvent it by encoding the filename parameter according to http://ftp.rfc-editor.org/in-notes/rfc2184.txt Note that parameter continuation ala filename*1=...; filename*2= is not really supported by MUAs, but support for filename*=... seems to be a /bit/ better. nd -- http://mail.python.org/mailman/listinfo/python-list