screen_capture.rb

require 'sinatra'
require 'securerandom'


module OS
  class << self
    def get
      linux || mac || windows
    end 

    private
    def linux
      return :linux if /linux/ =~ RUBY_PLATFORM 
    end

    def mac
      return :mac if /darwin/ =~ RUBY_PLATFORM
    end

    def windows
      return :windows if /cygwin|mswin|mingw|bccwin|wince|emx/ =~ RUBY_PLATFORM
    end
  end
end

COMMANDS = {
  linux: "xxxxxxxx",
  mac: "screencapture -x",
  windows: "xxxxxxx"
}

set :server, :thin
set :bind, '0.0.0.0'

get '/' do 
  boundary = "shit"
  response['Content-Type'] = "multipart/x-mixed-replace; boundary=#{boundary}"
  stream(:keep_open) do |out|
    loop do
      name = SecureRandom.hex(10)
      `#{COMMANDS[OS.get]} #{name}.jpeg`

      out << "--#{boundary}\n"
      out << "Content-type: image/jpeg\n\n"
      out << File.open("#{name}.jpeg", 'rb') { |f| f.read }
      # `rm #{name}.jpeg`
      # sleep(0.5)
    end
  end
end