valve.rb

#!/usr/bin/env ruby
# usage: $0 <app ID> <passcode>

require 'uri'
require 'json'
require 'net/http'

module Valve
  URI_FORMAT = 'http://store.steampowered.com/actions/clues?key=%s'.freeze
  REFERER_FORMAT = 'http://store.steampowered.com/app/%d'.freeze
  def self.clue passcode, cookie, app_id
    uri = URI.parse(URI_FORMAT % URI.escape(passcode))
    req = Net::HTTP::Get.new uri
    req['Cookie'.freeze] = cookie unless cookie.nil?
    req['Referer'.freeze] = REFERER_FORMAT % app_id
    res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https'.freeze) {|h| h.request(req)}
    if res.is_a? Net::HTTPSuccess
      JSON.parse res.body
    else
      raise "got HTTP #{res.code} from #{uri}"
    end
  end
end

begin
  raise ArgumentError, "usage: #$0 <app id> <passcode>" unless ARGV.length == 2
  res = Valve.clue ARGV[1], ENV['COOKIE'], Integer(ARGV[0])
  STDOUT.puts res.inspect
  exit 0
rescue => e
  STDERR.puts "#$0: #{e.class}: #{e.message}"
  STDERR.puts e.backtrace
  exit 1
end