Working sample.

sms-gateway/conf.py

@@ -0,0 +1,8 @@
+GATEWAY_DOMAIN = 'chicago47-sms\.appspotmail\.com'
+EMAIL_PATTERN = re.compile(r'^.*<\s*(\d+)@%s\s*>\s*$' % re.escape(GATEWAY_DOMAIN))
+RECIPIENT = 'Chicago47 <don.schwarz@gmail.com>'
+TWILIO_ACCOUNT = 'xxx'
+TWILIO_TOKEN = 'xxx'
+SEND_SMS_ENABLED = False
+SMS_PHONE_NUMBER = '+1 773-309-4710'
+

sms-gateway/main.py

@@ -1,34 +1,64 @@
 #!/usr/bin/env python
 #
 
+import re
 import logging
 import webapp2
 
 from google.appengine.api import mail
 from google.appengine.ext.webapp.mail_handlers import InboundMailHandler 
 
+from twilio.rest import TwilioRestClient
+
+# All user-specified settings go in conf.py.
+import conf
 
 class ReceiveSmsHandler(webapp2.RequestHandler):
     def get(self):
         sender = self.request.get('From')
         body = self.request.get('Body')
+        if sender[0] == '+':
+            sender = sender[1:]
+
         self.response.out.write('Received SMS from %s: %s' % (sender, body))
 
         # string@appid.appspotmail.com
-        mail.send_mail(sender="Gateway <%s@chicago47-sms.appspotmail.com>" % sender,
-              to="Chicago47 <don.schwarz@gmail.com>",
+        mail.send_mail(sender="%s <%s@%s>" % (sender, sender, GATEWAY_DOMAIN),
+              to=RECIPIENT,
               subject="Received SMS message from %s" % sender,
               body=body)
 
 class ReceiveEmailHandler(InboundMailHandler):
     def receive(self, message):
         logging.info("Received a message from: " + message.sender)
+        sender = None
+        for to in [message.to]:
+            m = EMAIL_PATTERN.match(to)
+            if m:
+                sender = m.group(1)
+
+        if not sender:
+            raise Exception('Could not find sender in %s' % message.to())
+
         bodies = message.bodies(content_type='text/plain') 
+        payload = None
         for body in bodies: 
-            logging.info("charset: %s" % body[1].charset) 
-            logging.info("encoding: %s" % body[1].encoding) 
-            logging.info("payload: %s" % body[1].payload) 
+            logging.debug("charset: %s" % body[1].charset) 
+            logging.debug("encoding: %s" % body[1].encoding) 
+            logging.debug("payload: %s" % body[1].payload) 
+            payload = body[1].payload
+
+        client = TwilioRestClient(TWILIO_ACCOUNT, TWILIO_TOKEN)
+        if len(payload) > 155:
+            payload = payload[:155] + '...'
 
+        if SEND_SMS_ENABLED:
+            message = client.sms.messages.create(
+                to='+' + sender, from_=SMS_PHONE_NUMBER,
+                body=payload)
+        else:
+            logger.info('SEND_SMS_ENABLED is False, not sending SMS.')
+
 
 class ViewResponseHandler(webapp2.RequestHandler):
     def get(self):