Validating requests on GAE

app.py

import webapp2
import logging

from twilio.util import RequestValidator
from twilio import twiml

AUTH_TOKEN = 'xxxxx'

class MainPage(webapp2.RequestHandler):
    def twilio_request_validator(self):
        return RequestValidator(AUTH_TOKEN)

    def post(self):
        response = twiml.Response()
        validator = self.twilio_request_validator()
        signature = validator.validate(self.request.url, self.request.POST,
                self.request.headers['X-Twilio-Signature'])
        logging.info("Validation: %s" % str(signature))
        logging.info("Computed signature: %s" %
                str(validator.compute_signature(self.request.url,
                    self.request.POST)))
        logging.info("Received signature: %s" %
                self.request.headers['X-Twilio-Signature'])

        logging.info("Request URL: %s" % self.request.url)
        logging.info("POST Params: %s" % self.request.POST)

        s = self.request.url
        for k, v in sorted(self.request.POST.items()):
            s += k + v
        logging.info("Generated string: %s" % s)

        if signature:
            response.message("Works!")
        else:
            response.message("SHIT.")

        self.response.headers['Content-Type'] = 'text/xml'
        self.response.write(str(response))

application = webapp2.WSGIApplication([
    ('/sms', MainPage)
], debug=True)