Upgrade to reCAPTCHA v2

reCAPTCHA v1 has been shut down since March 2018.

We now uses reCAPTCHA v2:
- user must check a simple checkbox (No CAPTCHA),
- eventually he must validate a challenge.

Moving keys settings allows to use the captcha for development.

Fixes #192.

cof/settings/common.py

@@ -42,9 +42,6 @@ REDIS_DB = import_secret("REDIS_DB")
 REDIS_HOST = import_secret("REDIS_HOST")
 REDIS_PORT = import_secret("REDIS_PORT")
 
-RECAPTCHA_PUBLIC_KEY = import_secret("RECAPTCHA_PUBLIC_KEY")
-RECAPTCHA_PRIVATE_KEY = import_secret("RECAPTCHA_PRIVATE_KEY")
-
 KFETOPEN_TOKEN = import_secret("KFETOPEN_TOKEN")
 LDAP_SERVER_URL = import_secret("LDAP_SERVER_URL")
 
@@ -207,6 +204,14 @@ AUTHENTICATION_BACKENDS = (
     'kfet.auth.backends.GenericBackend',
 )
 
+
+# reCAPTCHA settings
+# https://github.com/praekelt/django-recaptcha
+#
+# Default settings authorize reCAPTCHA usage for local developement.
+# Public and private keys are appended in the 'prod' module settings.
+
+NOCAPTCHA = True
 RECAPTCHA_USE_SSL = True
 
 CORS_ORIGIN_WHITELIST = (

cof/settings/prod.py

@@ -6,7 +6,7 @@ The settings that are not listed here are imported from .common
 import os
 
 from .common import *  # NOQA
-from .common import BASE_DIR
+from .common import BASE_DIR, import_secret
 
 
 DEBUG = False
@@ -28,3 +28,7 @@ STATIC_ROOT = os.path.join(
 STATIC_URL = "/gestion/static/"
 MEDIA_ROOT = os.path.join(os.path.dirname(BASE_DIR), "media")
 MEDIA_URL = "/gestion/media/"
+
+
+RECAPTCHA_PUBLIC_KEY = import_secret("RECAPTCHA_PUBLIC_KEY")
+RECAPTCHA_PRIVATE_KEY = import_secret("RECAPTCHA_PRIVATE_KEY")