Convert json files that include $uuid node

uuid_to_bindata.rb

#!/usr/bin/env ruby

require 'json'

def uuid_to_hex(uuid)
  hex = uuid.gsub(/[{}-]/, "")
  msb = hex[0,16]
  lsb = hex[16,16]
  msb = msb[14, 2] + msb[12, 2] + msb[10, 2] + msb[8, 2] + msb[6, 2] + msb[4, 2] + msb[2, 2] + msb[0, 2]
  lsb = lsb[14, 2] + lsb[12, 2] + lsb[10, 2] + lsb[8, 2] + lsb[6, 2] + lsb[4, 2] + lsb[2, 2] + lsb[0, 2]
  msb + lsb
end

def hex_to_base64_digest(hexdigest)
  [[hexdigest].pack("H*")].pack("m0")
end

def find_uuid_node_and_replace(hash)
  hash.inject({}) do |n, (k,v)|
    if v.is_a? Enumerable
      n[k] = find_uuid_node_and_replace(v)
    else
      if k == "$uuid"
         n["$binary"] = hex_to_base64_digest(uuid_to_hex(v))
         n["$type"] = "03"
      else
        n[k] = v
      end
    end
    n
  end
end

ARGF.each do |line|
  object = JSON.parse(line)

  puts find_uuid_node_and_replace(object).to_json
end