Use reCaptcha api v2

No need to change existing code, this just works.

flask_wtf/_compat.py

@@ -12,3 +12,10 @@ def to_bytes(text):
     if isinstance(text, text_type):
         text = text.encode('utf-8')
     return text
+
+
+def from_bytes(bytes, encoding='utf-8'):
+    """Decodes bytes to text if needed."""
+    if not isinstance(bytes, string_types):
+        bytes = bytes.decode(encoding)
+    return bytes

flask_wtf/recaptcha/validators.py

@@ -7,27 +7,23 @@
 from flask import request, current_app
 from wtforms import ValidationError
 from werkzeug import url_encode
-from .._compat import to_bytes
+from .._compat import to_bytes, from_bytes
+import json
 
-RECAPTCHA_VERIFY_SERVER = 'https://www.google.com/recaptcha/api/verify'
+RECAPTCHA_VERIFY_SERVER = 'https://www.google.com/recaptcha/api/siteverify'
 
 __all__ = ["Recaptcha"]
 
 
 class Recaptcha(object):
+
     """Validates a ReCaptcha."""
 
     _error_codes = {
-        'invalid-site-public-key': 'The public key for reCAPTCHA is invalid',
-        'invalid-site-private-key': 'The private key for reCAPTCHA is invalid',
-        'invalid-referrer': (
-            'The public key for reCAPTCHA is not valid for '
-            'this domainin'
-        ),
-        'verify-params-incorrect': (
-            'The parameters passed to reCAPTCHA '
-            'verification are incorrect'
-        )
+        'missing-input-secret':     'The secret parameter is missing.',
+        'invalid-input-secret':     'The secret parameter is invalid or malformed.',
+        'missing-input-response':   'The response parameter is missing.',
+        'invalid-input-response':   'The response parameter is invalid or malformed.',
     }
 
     def __init__(self, message=u'Invalid word. Please try again.'):
@@ -38,46 +34,42 @@ def __call__(self, form, field):
             return True
 
         if request.json:
-            challenge = request.json.get('recaptcha_challenge_field', '')
-            response = request.json.get('recaptcha_response_field', '')
+            response = request.json.get('g-recaptcha-response', '')
         else:
-            challenge = request.form.get('recaptcha_challenge_field', '')
-            response = request.form.get('recaptcha_response_field', '')
+            response = request.form.get('g-recaptcha-response', '')
         remote_ip = request.remote_addr
 
-        if not challenge or not response:
+        if not response:
             raise ValidationError(field.gettext(self.message))
 
-        if not self._validate_recaptcha(challenge, response, remote_ip):
+        if not self._validate_recaptcha(response, remote_ip):
             field.recaptcha_error = 'incorrect-captcha-sol'
             raise ValidationError(field.gettext(self.message))
 
-    def _validate_recaptcha(self, challenge, response, remote_addr):
+    def _validate_recaptcha(self, response, remote_addr):
         """Performs the actual validation."""
         try:
             private_key = current_app.config['RECAPTCHA_PRIVATE_KEY']
         except KeyError:
             raise RuntimeError("No RECAPTCHA_PRIVATE_KEY config set")
 
         data = url_encode({
-            'privatekey': private_key,
+            'secret':     private_key,
             'remoteip':   remote_addr,
-            'challenge':  challenge,
             'response':   response
         })
 
-        response = http.urlopen(RECAPTCHA_VERIFY_SERVER, to_bytes(data))
+        http_response = http.urlopen(RECAPTCHA_VERIFY_SERVER, to_bytes(data))
 
-        if response.code != 200:
+        if http_response.code != 200:
             return False
 
-        rv = [l.strip() for l in response.readlines()]
+        json_resp = json.loads(from_bytes(http_response.read()))
 
-        if rv and rv[0] == to_bytes('true'):
+        if json_resp["success"]:
             return True
 
-        if len(rv) > 1:
-            error = rv[1]
+        for error in json_resp["error-codes"]:
             if error in self._error_codes:
                 raise RuntimeError(self._error_codes[error])
 

flask_wtf/recaptcha/widgets.py

@@ -1,31 +1,31 @@
 # -*- coding: utf-8 -*-
 
 from flask import current_app, Markup
-from werkzeug import url_encode
 from flask import json
-from .._compat import text_type
 JSONEncoder = json.JSONEncoder
 
-try:
-    from speaklater import _LazyString
-
-    class _JSONEncoder(JSONEncoder):
-        def default(self, o):
-            if isinstance(o, _LazyString):
-                return str(o)
-            return JSONEncoder.default(self, o)
-except ImportError:
-    _JSONEncoder = JSONEncoder
-
-
-RECAPTCHA_API_SERVER = '//www.google.com/recaptcha/api/'
 RECAPTCHA_HTML = u'''
-<script type="text/javascript">var RecaptchaOptions = %(options)s;</script>
-<script type="text/javascript" src="%(script_url)s"></script>
+<script src='https://www.google.com/recaptcha/api.js'></script>
+<div class="g-recaptcha" data-sitekey="%(public_key)s"></div>
 <noscript>
-  <iframe src="%(frame_url)s" height="300" width="500" frameborder="0"></iframe><br>
-  <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
-  <input type="hidden" name="recaptcha_response_field" value="manual_challenge">
+  <div style="width: 302px; height: 352px;">
+    <div style="width: 302px; height: 352px; position: relative;">
+      <div style="width: 302px; height: 352px; position: absolute;">
+        <iframe src="https://www.google.com/recaptcha/api/fallback?k=%(public_key)s"
+                frameborder="0" scrolling="no"
+                style="width: 302px; height:352px; border-style: none;">
+        </iframe>
+      </div>
+      <div style="width: 250px; height: 80px; position: absolute; border-style: none;
+                  bottom: 21px; left: 25px; margin: 0px; padding: 0px; right: 25px;">
+        <textarea id="g-recaptcha-response" name="g-recaptcha-response"
+                  class="g-recaptcha-response"
+                  style="width: 250px; height: 80px; border: 1px solid #c1c1c1;
+                         margin: 0px; padding: 0px; resize: none;" value="">
+        </textarea>
+      </div>
+    </div>
+  </div>
 </noscript>
 '''
 
@@ -34,15 +34,11 @@ def default(self, o):
 
 class RecaptchaWidget(object):
 
-    def recaptcha_html(self, query, options):
+    def recaptcha_html(self, public_key):
         html = current_app.config.get('RECAPTCHA_HTML', RECAPTCHA_HTML)
-        server = current_app.config.get(
-            'RECAPTCHA_API_SERVER', RECAPTCHA_API_SERVER
-        )
+
         return Markup(html % dict(
-            script_url='%schallenge?%s' % (server, query),
-            frame_url='%snoscript?%s' % (server, query),
-            options=json.dumps(options, cls=_JSONEncoder)
+            public_key=public_key
         ))
 
     def __call__(self, field, error=None, **kwargs):
@@ -52,32 +48,5 @@ def __call__(self, field, error=None, **kwargs):
             public_key = current_app.config['RECAPTCHA_PUBLIC_KEY']
         except KeyError:
             raise RuntimeError("RECAPTCHA_PUBLIC_KEY config not set")
-        query_options = dict(k=public_key)
-
-        if field.recaptcha_error is not None:
-            query_options['error'] = text_type(field.recaptcha_error)
-
-        query = url_encode(query_options)
-
-        _ = field.gettext
-
-        options = {
-            'theme': 'clean',
-            'custom_translations': {
-                'audio_challenge': _('Get an audio challenge'),
-                'cant_hear_this': _('Download sound as MP3'),
-                'help_btn': _('Help'),
-                'image_alt_text': _('reCAPTCHA challenge image'),
-                'incorrect_try_again': _('Incorrect. Try again.'),
-                'instructions_audio': _('Type what you hear'),
-                'instructions_visual': _('Type the text'),
-                'play_again': _('Play sound again'),
-                'privacy_and_terms': _('Privacy & Terms'),
-                'refresh_btn': _('Get a new challenge'),
-                'visual_challenge': _('Get a visual challenge'),
-            }
-        }
-
-        options.update(current_app.config.get('RECAPTCHA_OPTIONS', {}))
 
-        return self.recaptcha_html(query, options)
+        return self.recaptcha_html(public_key)