gistfile1.rb

require 'rack/utils'

module Fx

  class FlashSessionCookie
    def initialize(app, session_key = '_session_id')
      @app = app
      @session_key = session_key
    end

    def call(env)
      if env['HTTP_USER_AGENT'] =~ /^(Adobe|Shockwave) Flash/
        params = ::Rack::Utils.parse_query(env['QUERY_STRING'])

        unless params[@session_key].nil?
          env['HTTP_COOKIE'] = "#{@session_key}=#{params[@session_key]}".freeze
        end
      end

      @app.call(env)
    end
  end

end