Rack::CGI

Let you using CGI in your rack application.

Here is an example for using Rack::CGI # config.ru

use Rack::CGI, cgi_path: 'cgi', index: 'index.cgi', Rack::CGI::Executable => '', /\.php$/ => '/usr/bin/php-cgi'
use Rack::Static, urls: ['/'], root: 'cgi'
run proc{ [404, {"CONTENT-TYPE" => "text/plain"}, ['404 Not Found']] }

In default, Rack::CGI will use Dir.pwd as document root, you can use cgi_path: path to change it.

When user access directory, Rack::CGI will use index script instand of.

If you not special index, Rack::CGI will not have a default value, and it's not works.

You can special index as follow:

use Rack::CGI, index: 'index.php'

# or special multiple, Rack::CGI will try each by order
use Rack::CGI, index: ['index.php', 'index.cgi']

When Rack::CGI found a script file in disk, it will try to find a rule to deal it.

You can special multiple rules, in follow format:

use Rack::CGI, match1 => deal1, match2 => deal2, match3 => deal3 ...

match can be Rack::CGI::Executable or Regexp.
Rack::CGI::Executable match all script that is executable.
Regexp will try to match script full path.

If none rules match, Rack::CGI will do nothing. Such as if you spacial Rack::CGI::Executable => "", and your file is not executable, Rack::CGI will not tell you file cannot executable, but just skiped.

deal can be nil, "", path_to_application.
If you special nil, nothing will happened, as if not matched.
If you special "", script will be launched directly. Ensure script is executable.
If you special path_to_application, application will be launched with script name.

In some programs(such as phpBB), when you visit a dir without ending '/'. (Such as 'http://wps-community.org/forum') All relative resource will cannot accessed. In this case, we have to redirect 'http://wps-community.org/forum' to 'http://wps-community.org/forum/' to avoid this problem.

You can use following code to open this feature.

use Rack::CGI, ..., dir_redirect: true, ...

Originally I intended to write a project named rails-cgi. But it's so trouble, and run Rack app in rails is not very complex. So I give up rails-cgi.

Create a cgi controller

$ rails g controller cgi

Create a Rack Application in CgiController

# You can changed arguments as you want
CGI = Rack::Builder.new do
  use Rack::CGI, cgi_path: 'cgi', index: ['index.cgi', 'index.php'], Rack::CGI::Executable => '', /\.php$/ => '/usr/bin/php-cgi'
  use Rack::Static, urls: ['/'], root: 'cgi'
  run proc{ |env| raise ActionController::RoutingError, env['PATH_INFO'] + " not found!" }
end

Call Rack App in rails controller

# add an action to controller
def cgi
  [self.status, self.response.headers, self.response_body] = CGI.call env
end
# of course, you can add decoration code here, such as call rails layout

Add route

# add follow to config/routes.rb
get '/cgi-bin/*path' => 'cgi#cgi'

POST Request support