class Goliath::Rack::Favicon

def call(env)
  if env['REQUEST_PATH'] == '/favicon.ico'
    env.logger.info('Serving favicon.ico')
    [200, {'Last-Modified' => @last_modified,
           'Expires' => @expires,
           'Content-Type' => "image/vnd.microsoft.icon"}, @favicon]
  else
    @app.call(env)
  end
end

def initialize(app, filename)
  @app = app
  @favicon = File.read(File.join(filename))
  @expires  = Time.at(Time.now + (60 * 60 * 24 * 7)).utc.rfc822.to_s
  @last_modified = File.mtime(filename).utc.rfc822.to_s
end