captcha_server

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= An efficient CAPTCHA server

== Description

This server is built on Nginx and Memcached. It stores all the CAPTCHA image in the memcached. When the new request cames, Nginx will reply a CAPTCHA page. If the client passes the verification, He will be given a secure cookie. With this cookie, client can visit all the resources in the server.

== Component

• The derivate of Nginx: ngx_openresty(http://openresty.org/).
• My secure cookie module(https://github.com/yaoweibin/nginx_secure_cookie_module).
• Memcached
• JCaptcha 2.0(http://jcaptcha.sourceforge.net/)

== Installation

=== Install the memcached $wget http://memcached.googlecode.com/files/memcached-1.4.10.tar.gz $tar zxvf memcached-1.4.10.tar.gz $cd memcached-1.4.10 $./configure && make $sudo make install $/usr/local/bin/memcached -d

=== Generate the CAPTCHA image $cd /path/to/captcha_server $cd captcha $./makeimg.sh # 10000 images will be created in the img directory $ruby put_img.rb #You need the memcached gem packet

=== Install the Nginx $wget http://agentzh.org/misc/nginx/ngx_openresty-1.0.10.24.tar.gz $tar zxvf ngx_openresty-1.0.10.24.tar.gz $cd ngx_openresty-1.0.10.24 $git clone git://github.com/yaoweibin/nginx_secure_cookie_module.git $./configure --with-debug --with-luajit
--add-module=nginx_secure_cookie_module $make $sudo make install

=== Copy the configure and pages $cd /path/to/captcha_server $cp conf/nginx.conf /path/to/nginx.conf $cp html/* /path/to/html/ #this is your root directory

=== Start the Nginx $sudo /usr/loca/nginx/sbin/nginx -c /path/to/nginx.conf