hCaptcha Support (#12594)

* Initial work on hCaptcha

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Use module

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Format

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* At least return and debug log a captcha error

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Pass context to hCaptcha

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Add context to recaptcha

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* fix lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Finish hcaptcha

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Update example config

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Apply error fix for recaptcha

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Change recaptcha ChallengeTS to string

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Andrew Thornton <art27@cantab.net>

custom/conf/app.example.ini

@@ -585,12 +585,15 @@ ENABLE_REVERSE_PROXY_AUTO_REGISTRATION = false
 ENABLE_REVERSE_PROXY_EMAIL = false
 ; Enable captcha validation for registration
 ENABLE_CAPTCHA = false
-; Type of captcha you want to use. Options: image, recaptcha
+; Type of captcha you want to use. Options: image, recaptcha, hcaptcha
 CAPTCHA_TYPE = image
 ; Enable recaptcha to use Google's recaptcha service
 ; Go to https://www.google.com/recaptcha/admin to sign up for a key
 RECAPTCHA_SECRET  =
 RECAPTCHA_SITEKEY =
+; For hCaptcha, create an account at https://accounts.hcaptcha.com/login to get your keys
+HCAPTCHA_SECRET =
+HCAPTCHA_SITEKEY =
 ; Change this to use recaptcha.net or other recaptcha service
 RECAPTCHA_URL = https://www.google.com/recaptcha/
 ; Default value for KeepEmailPrivate