Port the maximum message size check to a rule. Add doctest.

Rename the implicit.txt doctest.

specialized_message_from_string(): Mimic the way the text->message parser will
include the size of the original text as an attribute on the message object.
The maximum message size rule will use this information.

2 files changed, 49 insertions, 1 deletions

diff --git a/Mailman/rules/implicit_dest.py b/Mailman/rules/implicit_dest.py
index 8c9ba8899..e056a2e9e 100644
--- a/Mailman/rules/implicit_dest.py
+++ b/Mailman/rules/implicit_dest.py
@@ -23,7 +23,6 @@ __metaclass__ = type
 
 import re
 from email.utils import getaddresses
-from itertools import chain
 from zope.interface import implements
 
 from Mailman.i18n import _
diff --git a/Mailman/rules/max_size.py b/Mailman/rules/max_size.py
new file mode 100644
index 000000000..1e62b2ad8
--- /dev/null
+++ b/Mailman/rules/max_size.py
@@ -0,0 +1,49 @@
+# 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 maximum message size rule."""
+
+__all__ = ['max_size']
+__metaclass__ = type
+
+
+from zope.interface import implements
+
+from Mailman.i18n import _
+from Mailman.interfaces import IRule
+
+
+
+class MaximumSize:
+    """The implicit destination rule."""
+    implements(IRule)
+
+    name = 'max-size'
+    description = _('Catch messages that are bigger than a specified maximum.')
+
+    def check(self, mlist, msg, msgdata):
+        """See `IRule`."""
+        if mlist.max_message_size == 0:
+            return False
+        assert hasattr(msg, 'original_size'), (
+            'Message was not sized on initial parsing.')
+        # The maximum size is specified in 1024 bytes.
+        return msg.original_size / 1024.0 > mlist.max_message_size
+
+
+
+max_size = MaximumSize()