Run Symfony2 apps with Rack (rackup! pow!)

config.ru

# vim:se filetype=ruby
# vim:se foldlevel=3
#
# Hacks and monkeys to run Symfony2 applications as Rack apps using
# the rack-legacy and rack-rewrite gems.
#
# A couple of rack-rewrite rules take care of handing requests to the
# default front controller (app.php) and a subclass of rack-legacy's
# Php fixes PATH_INFO for Symfony routing.
#
# Got the idea from:
# http://stuff-things.net/2011/05/16/legacy-development-with-pow/
#
# Original symfony 1.4 file by https://github.com/marzocchi

require 'rubygems'
require "rack"
require "rack-legacy"
require "rack-rewrite"

# Your Symfony project web dir
SF_WEB_DIR = File.join Dir.getwd, 'web'

module Rack
    module Legacy
        class Symfony2 < Php
            # Strip the script name from PATH_INFO, or Symfony won't be able to parse it
            def run(env, path)
                if env["PATH_INFO"] =~ %r{^/[^\.]+\.php(.*)$}
                    env.merge!({'ORIG_PATH_INFO' => env['PATH_INFO'], 'PATH_INFO' => $1})
                end
                super env, path
            end
        end
    end
end

use Rack::Rewrite do
    # Dispatch any request for "/" to /app.php
    rewrite %r{(^/$)}, lambda {|match, rack_env|
        return "/app.php" if File.exists? File.join SF_WEB_DIR, 'app.php'
    }

    # Prepend "/app.php" to any URI not matching an existing file
    # and not containing a php script name
    rewrite %r{^(?!/[^\.]+\.php)(/.*)$}, lambda { |match, rack_env|
        file = File.join SF_WEB_DIR, rack_env["PATH_INFO"]

        unless File.exists? file
            return "/app.php" + rack_env["PATH_INFO"] if File.exists? File.join SF_WEB_DIR, 'app.php'
        end
        rack_env["PATH_INFO"]
    }
end

use Rack::Legacy::Symfony2, SF_WEB_DIR
run Rack::File.new SF_WEB_DIR