CAPTCHA is an acronym for "Completely Automatic Public Turing Test to Tell Computers and Humans Apart". It is a task, that human can easily solve, but computer not.
It is used as a challenge-response to ensure that the individual submitting information is a human and not an automated process. Typically, a captcha is used with form submissions where authenticated users are not necessary, but you want to prevent spam submissions.
hcaptcha is a free, easy-to-use WebService helps enterprises to integrate Captcha into their own business systems. Similar to Google reCaptcha but can be customized and deployment to your private network.
- High Security: using the distorted, bonding, dislocation and random word length, making it difficult to be dismantled, recognition by machine
- High Performance: Based on C/libevent/libgd/memcached, all levels of optimization, upto 500 Requests pre second in single-threaded (120x60 pixels)
- Local Deployment: Similar to Google reCaptcha but can deployment to private network
- Cluster Deployment： Support for large-scale network deployment
LVS -> Hooto Captcha Cluster -> Memcached Cluster
LVS -> Hooto Captcha Cluster -> Memcached Cluster
apt-get install gcc g++ libgd2-xpm-dev libevent-dev libmemcached-dev memcached git
yum install gcc gcc-c++ gd-devel libevent-devel libmemcached-devel memcached git
git clone git://github.com/eryx/hcaptcha.git
cd hcaptcha
make
make insall
/opt/hcaptcha/bin/hcaptchad -c /opt/hcaptcha/etc/hcaptchad.conf
Start hcaptcha/1.0.4 [OK]
killall hcaptchad
Signal(15) Stop hcaptcha/1.0.4 [OK]
http://127.0.0.1:9527/hcaptcha/api/image?hcaptcha_token=123&hcaptcha_opt=refresh
- API Request
URL
http://127.0.0.1:9527/hcaptcha/api/image
Parameters (sent via GET)
| hcaptcha_token (required) | The random token created by client, Example: hcaptcha_token=abc123 |
| hcaptcha_opt (optional) | Reload a new CAPTCHA image, Example: hcaptcha_opt=refresh |
-
API Response
Content-Type:image/png binary data...
After your page is successfully displaying CAPTCHA image, you need to configure your form to check whether the answers entered by the users are correct.
- API Requset
URL
http://127.0.0.1:9527/hcaptcha/api/verify
Parameters (sent via GET)
| hcaptcha_token (required) | required. The random token created by client |
| hcaptcha_word (required) | The User's Answer |
- API Response
The response from verify is a series of strings separated by "\n".
To read the string, split the line and read each field.
| Line 1 | "true" or "false". True if the CAPTCHA was successful |
| Line 2 | if Line 1 is false, then this string will be an error code. CAPTCHA can display the error to the user/client |
hcaptcha currently returns the following error codes:
| incorrect-hcaptcha-word | the user's answer was incorrect |
| invalid-request | the parameters of the verify was incorrect |
| hcaptcha-not-reachable | the hcaptcha service unavailable |
false
incorrect-captcha-word
http://ws.hooto.com/hcaptcha/api/image?hcaptcha_token=123&hcaptcha_opt=refresh