Puppet Function to return list (array) of resource types (classes) from the Puppet API from a supplied regex

fetch_resource_types.rb

require "net/http"
require "net/https"
require "uri"
require "json"
require "socket"
require "puppet"

module Puppet::Parser::Functions
  newfunction(:fetch_resource_types, :type => :rvalue) do |args|

    environment = args[0]
    regex = args[1]
    me = Socket.gethostname

    cert = File.read("/etc/puppetlabs/puppet/ssl/certs/#{me}.pem")
    key = File.read("/etc/puppetlabs/puppet/ssl/private_keys/#{me}.pem")
    ca_cert = "/etc/puppetlabs/puppet/ssl/certs/ca.pem"

    url = "https://#{me}:8140/puppet/v3/resource_types/#{regex}?environment=#{environment}"
    encoded_url = URI.encode(url)

    uri = URI.parse(encoded_url)
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    http.cert = OpenSSL::X509::Certificate.new(cert)
    http.key = OpenSSL::PKey::RSA.new(key)
    http.ca_file = ca_cert
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    request = Net::HTTP::Get.new(uri.request_uri)
    response = http.request(request)
    data = response.body

    data = PSON.parse(data)

    classes = Array.new

    data.each do |key|
      classes << key['name']
    end

    classes.join(",")
  end
end