From 775be2a87ad8a744548d1a1d0ae87a7e665ca10e Mon Sep 17 00:00:00 2001
From: Mike Pirnat <mpirnat@gmail.com>
Date: Wed, 8 Aug 2012 23:03:36 -0400
Subject: Adds rudimentary spam check

---
 email_gateway.py | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/email_gateway.py b/email_gateway.py
index e73e3e2..fe58fad 100755
--- a/email_gateway.py
+++ b/email_gateway.py
@@ -6,7 +6,9 @@ import re
 import urlparse
 from cStringIO import StringIO
 from email.mime.text import MIMEText
-from ConfigParser import SafeConfigParser as ConfigParser, NoSectionError
+from ConfigParser import SafeConfigParser as ConfigParser, \
+        NoSectionError, NoOptionError
+from spambayes.storage import PickledClassifier
 
 
 config = ConfigParser()
@@ -26,6 +28,18 @@ def send_message(text, subject, to, from_email):
     p.close()
 
 
+def looks_like_spam(message, config, section):
+    pickle_filename = config.get(section, 'spam.pickle_file')
+    min_spam_prob = config.getfloat(section, 'spam.min_spam_prob')
+
+    bayes = PickledClassifier(pickle_filename)
+
+    if bayes.chi2_spamprob(message) >= min_spam_prob:
+        return True
+
+    return False
+
+
 def email_app(environ, start_response):
     ignored_fields = []
     useful_fields = []
@@ -60,6 +74,14 @@ def email_app(environ, start_response):
         start_response('403 Forbidden', [('Content-Type', 'text/plain')])
         return "Invalid send!"
 
+    try:
+        if config.getboolean(form_key, 'spam.check') \
+                and looks_like_spam(context["message"], config, form_key):
+            start_response('403 Forbidden', [('Content-Type', 'text/plain')])
+            return "I don't like SPAM!"
+    except NoOptionError:
+        pass
+
     useful_fields = ["{0}: {1}".format(*f)
                      for f in useful_fields
                      if f[0] not in ignored_fields]
-- 
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