1 files changed, 85 insertions, 0 deletions

diff --git a/mailman/Bouncers/Postfix.py b/mailman/Bouncers/Postfix.py
new file mode 100644
index 000000000..3c250e95e
--- /dev/null
+++ b/mailman/Bouncers/Postfix.py
@@ -0,0 +1,85 @@
+# Copyright (C) 1998-2008 by the Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+"""Parse bounce messages generated by Postfix.
+
+This also matches something called `Keftamail' which looks just like Postfix
+bounces with the word Postfix scratched out and the word `Keftamail' written
+in in crayon.
+
+It also matches something claiming to be `The BNS Postfix program', and
+`SMTP_Gateway'.  Everybody's gotta be different, huh?
+"""
+
+import re
+from cStringIO import StringIO
+
+
+
+def flatten(msg, leaves):
+    # give us all the leaf (non-multipart) subparts
+    if msg.is_multipart():
+        for part in msg.get_payload():
+            flatten(part, leaves)
+    else:
+        leaves.append(msg)
+
+
+
+# are these heuristics correct or guaranteed?
+pcre = re.compile(r'[ \t]*the\s*(bns)?\s*(postfix|keftamail|smtp_gateway)',
+                  re.IGNORECASE)
+rcre = re.compile(r'failure reason:$', re.IGNORECASE)
+acre = re.compile(r'<(?P<addr>[^>]*)>:')
+
+def findaddr(msg):
+    addrs = []
+    body = StringIO(msg.get_payload())
+    # simple state machine
+    #     0 == nothing found
+    #     1 == salutation found
+    state = 0
+    while 1:
+        line = body.readline()
+        if not line:
+            break
+        # preserve leading whitespace
+        line = line.rstrip()
+        # yes use match to match at beginning of string
+        if state == 0 and (pcre.match(line) or rcre.match(line)):
+            state = 1
+        elif state == 1 and line:
+            mo = acre.search(line)
+            if mo:
+                addrs.append(mo.group('addr'))
+            # probably a continuation line
+    return addrs
+
+
+
+def process(msg):
+    if msg.get_content_type() not in ('multipart/mixed', 'multipart/report'):
+        return None
+    # We're looking for the plain/text subpart with a Content-Description: of
+    # `notification'.
+    leaves = []
+    flatten(msg, leaves)
+    for subpart in leaves:
+        if subpart.get_content_type() == 'text/plain' and \
+           subpart.get('content-description', '').lower() == 'notification':
+            # then...
+            return findaddr(subpart)
+    return None