forum_modules/recaptcha/lib/captcha.py

   1 # -*- coding: utf-8 -*-
   2
   3 import urllib2, urllib
   4
   5 API_SSL_SERVER="https://www.google.com/recaptcha/api"
   6 API_SERVER="http://www.google.com/recaptcha/api"
   7 VERIFY_SERVER="www.google.com"
   8
   9 class RecaptchaResponse(object):
  10     def __init__(self, is_valid, error_code=None):
  11         self.is_valid = is_valid
  12         self.error_code = error_code
  13
  14 def displayhtml (public_key):
  15
  16     return """
  17     <div id="recaptcha_field"></div>
  18     <script type="text/javascript" src="http://www.google.com/recaptcha/api/js/recaptcha_ajax.js"></script>
  19
  20     <script type="text/javascript">
  21          $(function(){
  22              Recaptcha.create("%(PublicKey)s", 'recaptcha_field', {
  23              theme: "red",
  24              callback: Recaptcha.focus_response_field});
  25          });
  26     </script>
  27
  28 """ % {
  29         'PublicKey' : public_key,
  30         }
  31
  32
  33 def submit (recaptcha_challenge_field,
  34             recaptcha_response_field,
  35             private_key,
  36             remoteip):
  37
  38     if not (recaptcha_response_field and recaptcha_challenge_field and
  39             len (recaptcha_response_field) and len (recaptcha_challenge_field)):
  40         return RecaptchaResponse (is_valid = False, error_code = 'incorrect-captcha-sol')
  41
  42
  43     def encode_if_necessary(s):
  44         if isinstance(s, unicode):
  45             return s.encode('utf-8')
  46         return s
  47
  48     params = urllib.urlencode ({
  49         'privatekey': encode_if_necessary(private_key),
  50         'remoteip' :  encode_if_necessary(remoteip),
  51         'challenge':  encode_if_necessary(recaptcha_challenge_field),
  52         'response' :  encode_if_necessary(recaptcha_response_field),
  53         })
  54
  55     request = urllib2.Request (
  56         url = "http://%s/recaptcha/api/verify" % VERIFY_SERVER,
  57         data = params,
  58         headers = {
  59             "Content-type": "application/x-www-form-urlencoded",
  60             "User-agent": "reCAPTCHA Python"
  61         }
  62     )
  63
  64     httpresp = urllib2.urlopen(request)
  65
  66     return_values = httpresp.read().splitlines()
  67     httpresp.close()
  68
  69     return_code = return_values[0]
  70
  71     if return_code == "true":
  72         return RecaptchaResponse(is_valid = True)
  73     else:
  74         return RecaptchaResponse(is_valid = False, error_code = return_values[1])