[Note: I'm CC'ing mailman-users as this might be useful for them.
Hopefully, they'll correct my hack by telling me the right way to do this.
*grin*]
On Fri, 26 Jul 2002, Ares Liu wrote:
> I checked the archive mail on mailman list. Some one had discussed this
> question before.
Do you have a link to that archived message? I'm interested in looking at
this, just for curiosity's sake.
> The reason is if I use no English words in the Subject Line, The
> language code marker will added in fornt of "Re:"and encoding the
> Subject as sth like "=?gb2312?B2xxxxxxxx?=".
Yes, it looks like it wraps it in some kind of encoding... utf-8? I wish
I knew more about Unicode.
> It is surely that mailman could not search any reply keyword. So, added
> prefix again.
I think I understand better now. The problem is that the encoding leaves
many of the characters alone, but transforms the braces in:
'[Tutor]'
to something like:
'=5BTutor=5D'
I'm guessing this because 0x5b and 0x5D are the ascii codes for braces:
###
>>> chr(0x5b)
'['
>>> chr(0x5d)
']'
###
Hmmmm. Wait. I've seen these characters before. Is this MIME encoding?
MIME encoding is often used in representing language strings in email
because almost all systems can handle it.
###
>>> def mydecode(s):
... outputfile = StringIO.StringIO()
... mimetools.decode(StringIO.StringIO(s), outputfile,
'quoted-printable')
... return outputfile.getvalue()
...
>>> mydecode('=5BTutor=5D')
'[Tutor]'
###
Ah ha! It looks like it! Good!
In this case, maybe we can extend that check in
Handlers.CookHeaders.process() to take this particular encoding into
consideration: if we decode the header back to normal, then the prefix
check will work.
If you're feeling adventurous, and if you're comfortable editing Python,
you can add this file, 'quoted_printable_decoder.py' in the
'Mailman/Handlers/' directory of Mailman:
######
## quoted_printable_decoder.py
import StringIO, mimetools
def decode_quoted_printable(s):
"""Given a mime 'quoted-printable' string s, returns its decoding.
If anything bad happens, returns s."""
try:
outputfile = StringIO.StringIO()
mimetools.decode(StringIO.StringIO(s), outputfile,
'quoted-printable')
return outputfile.getvalue()
except:
return s
###
This new module will convert the header and change all the '=5B' and '=5D'
characters back into braces if it can do so safely. We'll be using it in
a moment.
Once you've added this module, within the same directory, let's modify
CookHeaders.py to use this function.
And make backups, because I have not tested this yet! *grin*
Add at the top of the CookHeaders module:
###
from quoted_printable_decoder import decode_quoted_printable
###
so that Cookheaders knows about our new function. Finally, modify the
check in the Cookheaders.process() function:
###
elif prefix and not re.search(re.escape(prefix), subject, re.I):
###
into:
###
elif prefix\
and not re.search(re.escape(prefix), subject, re.I)\
and not re.search(re.escape(prefix),
decode_quoted_printable(subject), re.I)
###
I've modified the logic to include the prefix check on the decoded subject
header. Ares, if this works, I'll send the patch over to the Mailman
folks. Who knows; it might be useful for someone else out there. *grin*
Best of wishes to you!
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