86 lines
2.7 KiB
Python
86 lines
2.7 KiB
Python
# Copyright (C) 1998-2003 by the Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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"""Parse bounce messages generated by Postfix.
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This also matches something called `Keftamail' which looks just like Postfix
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bounces with the word Postfix scratched out and the word `Keftamail' written
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in in crayon.
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It also matches something claiming to be `The BNS Postfix program', and
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`SMTP_Gateway'. Everybody's gotta be different, huh?
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"""
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import re
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from cStringIO import StringIO
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def flatten(msg, leaves):
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# give us all the leaf (non-multipart) subparts
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if msg.is_multipart():
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for part in msg.get_payload():
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flatten(part, leaves)
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else:
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leaves.append(msg)
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# are these heuristics correct or guaranteed?
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pcre = re.compile(r'[ \t]*the\s*(bns)?\s*(postfix|keftamail|smtp_gateway)',
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re.IGNORECASE)
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rcre = re.compile(r'failure reason:$', re.IGNORECASE)
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acre = re.compile(r'<(?P<addr>[^>]*)>:')
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def findaddr(msg):
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addrs = []
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body = StringIO(msg.get_payload())
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# simple state machine
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# 0 == nothing found
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# 1 == salutation found
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state = 0
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while 1:
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line = body.readline()
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if not line:
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break
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# preserve leading whitespace
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line = line.rstrip()
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# yes use match to match at beginning of string
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if state == 0 and (pcre.match(line) or rcre.match(line)):
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state = 1
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elif state == 1 and line:
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mo = acre.search(line)
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if mo:
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addrs.append(mo.group('addr'))
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# probably a continuation line
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return addrs
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def process(msg):
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if msg.get_content_type() not in ('multipart/mixed', 'multipart/report'):
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return None
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# We're looking for the plain/text subpart with a Content-Description: of
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# `notification'.
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leaves = []
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flatten(msg, leaves)
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for subpart in leaves:
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if subpart.get_content_type() == 'text/plain' and \
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subpart.get('content-description', '').lower() == 'notification':
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# then...
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return findaddr(subpart)
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return None
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