1 files changed, 106 insertions, 0 deletions
diff --git a/src/mailman/Mailbox.py b/src/mailman/Mailbox.py
new file mode 100644
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+++ b/src/mailman/Mailbox.py
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+# Copyright (C) 1998-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman 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 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman 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
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Extend mailbox.UnixMailbox.
+"""
+
+import sys
+import email
+import mailbox
+
+from email.errors import MessageParseError
+from email.generator import Generator
+
+from mailman.Message import Message
+from mailman.config import config
+
+
+
+def _safeparser(fp):
+    try:
+        return email.message_from_file(fp, Message)
+    except MessageParseError:
+        # Don't return None since that will stop a mailbox iterator
+        return ''
+
+
+
+class Mailbox(mailbox.PortableUnixMailbox):
+    def __init__(self, fp):
+        mailbox.PortableUnixMailbox.__init__(self, fp, _safeparser)
+
+    # msg should be an rfc822 message or a subclass.
+    def AppendMessage(self, msg):
+        # Check the last character of the file and write a newline if it isn't
+        # a newline (but not at the beginning of an empty file).
+        try:
+            self.fp.seek(-1, 2)
+        except IOError, e:
+            # Assume the file is empty.  We can't portably test the error code
+            # returned, since it differs per platform.
+            pass
+        else:
+            if self.fp.read(1) <> '\n':
+                self.fp.write('\n')
+        # Seek to the last char of the mailbox
+        self.fp.seek(1, 2)
+        # Create a Generator instance to write the message to the file
+        g = Generator(self.fp)
+        g.flatten(msg, unixfrom=True)
+        # Add one more trailing newline for separation with the next message
+        # to be appended to the mbox.
+        print >> self.fp
+
+
+
+# This stuff is used by pipermail.py:processUnixMailbox().  It provides an
+# opportunity for the built-in archiver to scrub archived messages of nasty
+# things like attachments and such...
+def _archfactory(mailbox):
+    # The factory gets a file object, but it also needs to have a MailList
+    # object, so the clearest <wink> way to do this is to build a factory
+    # function that has a reference to the mailbox object, which in turn holds
+    # a reference to the mailing list.  Nested scopes would help here, BTW,
+    # but we can't rely on them being around (e.g. Python 2.0).
+    def scrubber(fp, mailbox=mailbox):
+        msg = _safeparser(fp)
+        if msg == '':
+            return msg
+        return mailbox.scrub(msg)
+    return scrubber
+
+
+class ArchiverMailbox(Mailbox):
+    # This is a derived class which is instantiated with a reference to the
+    # MailList object.  It is build such that the factory calls back into its
+    # scrub() method, giving the scrubber module a chance to do its thing
+    # before the message is archived.
+    def __init__(self, fp, mlist):
+        scrubber_module = config.scrubber.archive_scrubber
+        if scrubber_module:
+            __import__(scrubber_module)
+            self._scrubber = sys.modules[scrubber_module].process
+        else:
+            self._scrubber = None
+        self._mlist = mlist
+        mailbox.PortableUnixMailbox.__init__(self, fp, _archfactory(self))
+
+    def scrub(self, msg):
+        if self._scrubber:
+            return self._scrubber(self._mlist, msg)
+        else:
+            return msg