runtime.rb

require 'digest'
require 'faye/websocket'
require 'pp'

Faye::WebSocket.load_adapter('thin')

GUID = '3f35e4f2-3920-4797-9044-c4046ea4fb53'

def create_websocket_accept (nonce)
  Digest::SHA1.base64digest "#{nonce}#{GUID}"
end

App = lambda do |env|
  return [200, { 'Content-Type' => 'text/plain' }, ['OK']] unless Faye::WebSocket.websocket? env

  request = Rack::Request.new env

  protocol = request.get_header 'HTTP_SEC_WEBSOCKET_PROTOCOL'
  version = request.get_header 'HTTP_SEC_WEBSOCKET_VERSION'
  key = request.get_header 'HTTP_SEC_WEBSOCKET_KEY'
  accept = create_websocket_accept key

  pp [:protocol, protocol]
  pp [:version, version]
  pp [:key, key]
  pp [:accept, accept]

  # socket = Faye::WebSocket.new env
  # socket.on :message do |event|
  #   p [:message, data.protocol, data.command, data.payload]
  #   socket.send event.data
  # end
  # socket.on :close do |event|
  #   p [:close, event.code, event.reason]
  #   ws = nil
  # end

  response = [101, {
    'Upgrade' => 'websocket',
    'Connection' => 'Upgrade',
    'Sec-Websocket-Accept' => accept,
    'Sec-Websocket-Protocol' => protocol,
    'Sec-Websocket-Version' => version,
  }, [""]]

  pp response

  response
end