gistfile1.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'eventmachine'

@config = {
  :host => "127.0.0.1",
  :port => 9666
}

puts DATA.read

module XMLSocketServer

  CR = 0.chr # ZERO BYTE

  # helpers

  def log( msg, level = :debug )
    STDOUT.puts msg
  end

  def policy_request?( data )
    data == "<policy-file-request/>\000"
  end

  def policy_document
    @policy ||= DATA.read
  end

  def push( data )
    if data[-1] != 0 # \000
      data << CR
    end
    send_data( data )
  end

  # the EventMachine hook

  def receive_data(data)
    log(  "RECVD # => #{data.inspect}" )

    if policy_request?( data )
      push( policy_document )
    else
      log( " [ == what now ? == ] " )
    end
  end

end

EventMachine::run do
  EventMachine::start_server( @config[:host], @config[:port], XMLSocketServer )
end

__END__
<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy
  SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
  <allow-access-from domain="*" to-ports="*" />
  <allow-access-from domain="127.0.0.1" to-ports="*" />
  <allow-access-from domain="localhost" to-ports="*" />
</cross-domain-policy>