Add three new rules and their associated doctests.

- A rule that checks to see if the sender is a moderated member.
- A rule that checks to see if the sender is a non-member.
- A rule that checks to see if the message has no (or an empty) Subject.

Give IMembers (and the associated database implementation) an `is_moderated`
flag.

1 files changed, 45 insertions, 0 deletions

diff --git a/Mailman/rules/no_subject.py b/Mailman/rules/no_subject.py
new file mode 100644
index 000000000..ca7cbd9d2
--- /dev/null
+++ b/Mailman/rules/no_subject.py
@@ -0,0 +1,45 @@
+# Copyright (C) 2007 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.
+
+"""The no-Subject header rule."""
+
+__all__ = ['no_subject_rule']
+__metaclass__ = type
+
+
+from zope.interface import implements
+
+from Mailman.i18n import _
+from Mailman.interfaces import IRule
+
+
+
+class NoSubject:
+    """The no-Subject rule."""
+    implements(IRule)
+
+    name = 'no-subject'
+    description = _('Catch messages with no, or empty, Subject headers.')
+
+    def check(self, mlist, msg, msgdata):
+        """See `IRule`."""
+        subject = msg.get('subject', '').strip()
+        return subject == ''
+
+
+
+no_subject_rule = NoSubject()