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Milter/cache.py

@@ -10,6 +10,9 @@
 # CBV results.
 #
 # $Log$
+# Revision 1.2  2007/01/05 23:33:55  customdesigned
+# Make blacklist an AddrCache
+#
 # Revision 1.1  2007/01/05 21:25:40  customdesigned
 # Move AddrCache to Milter package.
 #
@@ -52,7 +55,7 @@ class AddrCache(object):
   def has_key(self,sender):
     "True if sender is cached and has not expired."
     try:
-      lsender = sender.lower()
+      lsender = sender and sender.lower()
       ts,res = self.cache[lsender]
       too_old = time.time() - self.age*24*60*60	# max age in days
       if not ts or ts > too_old:
@@ -67,8 +70,7 @@ class AddrCache(object):
       try:
 	user,host = sender.split('@',1)
 	return self.has_key(host)
-      except ValueError:
-        pass
+      except: pass
     return False
 
   __contains__ = has_key

Milter/unsign.py

@@ -0,0 +1,17 @@
+# Author: Stuart D. Gathman <stuart@bmsi.com>
+# Copyright 2005 Business Management Systems, Inc.
+# This code is under the GNU General Public License.  See COPYING for details.
+
+# The localpart of SMTP return addresses is often signed.  The format
+# of the signing is application specific and doesn't concern us -
+# except that we wish to extract some sort of fixed string from
+# the variable signature which represents the "source" of the message.
+
+def unsign(s):
+  """Attempt to unsign localpart and return original email.
+  No attempt is made to verify the signature.
+  >>> unsign('SRS0=8Y3CZ=3U=jsconnor.com=bills@bmsi.com')
+  'bills@jsconnor.com'
+  """
+  # not implemented yet
+  return s