Remote Roku Ruby controller

roku.rb

require "io/console"
require "socket"
require "net/http"
require "uri"
require 'cgi'

SSDP_ADDR = "239.255.255.250";
SSDP_PORT = 1900;
SSDP_ST = "roku:ecp";

def find_roku_url
  ssdp_request = "M-SEARCH * HTTP/1.1\r\n" + \
                  "HOST: #{SSDP_ADDR}:#{SSDP_PORT}\r\n" + \
                  "MAN: \"ssdp:discover\"\r\n" + \
                  "ST: #{SSDP_ST}\r\n" + "\r\n";
  print ssdp_request
  s = UDPSocket.new
  s.send(ssdp_request, 0, SSDP_ADDR, SSDP_PORT)
  print s.recv(1000) # todo. parse this out
  return "http://192.168.1.73:8060/"
end

@url = find_roku_url

# Reads keypresses from the user including 2 and 3 escape character sequences.
def read_char
  STDIN.echo = false
  STDIN.raw!

  input = STDIN.getc.chr
  if input == "\e" then
    input << STDIN.read_nonblock(3) rescue nil
    input << STDIN.read_nonblock(2) rescue nil
  end
ensure
  STDIN.echo = true
  STDIN.cooked!

  return input
end

def call(url, path, method = :post)
  if method == :get
    Net::HTTP.get_response(URI(url + path))
  else
    Net::HTTP.post_form(URI(url + path), {})
  end
end

def press(command)
  call(@url, "keypress/#{command}")
end

def send_to_roku(c)
  case c
  when "`";       puts "HOME";                press "Home"
  when "\eb";     puts "OPTION-LEFT";         press "Rev"
  when "\ef";     puts "OPTION-RIGHT";        press "Fwd"
  when " ";       puts "SPACE";               press "Play"
  when "\r";      puts "\n";                  press "Select"
  when "\e[D";    puts "LEFT";                press "Left"
  when "\e[C";    puts "RIGHT";               press "Right"
  when "\e[B";    puts "DOWN";                press "Down"
  when "\e[A";    puts "UP";                  press "Up"
  when "\e";      puts "ESC";                 press "Back"
  when "\u0012";  puts "REPLAY";              press "InstantReplay"
  when "?";       puts "INFO";                press "Info"
  when "\177";    puts "BACKSPACE";           press "Backspace"
  when "/";       puts "SEARCH";              press "Search"
  when "\u0003";  puts "CONTROL-C";           exit 0
  when /^.$/;     print c;                    press "Lit_#{CGI.escape(c)}"
  else            puts "OTHER: #{c.inspect}"
  end
end

loop do send_to_roku(read_char) end