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: xymon_useradm_cmd_exec.rb
    path of file: ./repos/metasploit-framework/modules/exploits/unix/webapp
    
    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

  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Xymon useradm Command Execution',
      'Description' => %q{
        This module exploits a command injection vulnerability in Xymon
        versions before 4.3.25 which allows authenticated users
        to execute arbitrary operating system commands as the web
        server user.

        When adding a new user to the system via the web interface with
        `useradm.sh`, the user's username and password are passed to
        `htpasswd` in a call to `system()` without validation.

        This module has been tested successfully on Xymon version 4.3.10
        on Debian 6.
      },
      'License'     => MSF_LICENSE,
      'Author'      => [
        'Markus Krell', # Discovery
        'bcoles'        # Metasploit
      ],
      'References'  =>
        [
          ['CVE', '2016-2056'],
          ['PACKETSTORM', '135758'],
          ['URL', 'https://lists.xymon.com/pipermail/xymon/2016-February/042986.html'],
          ['URL', 'https://www.securityfocus.com/archive/1/537522/100/0/threaded'],
          ['URL', 'https://sourceforge.net/p/xymon/code/7892/'],
          ['URL', 'https://www.debian.org/security/2016/dsa-3495']
        ],
      'DisclosureDate' => '2016-02-14',
      'Platform'       => %w(unix linux solaris bsd),
      'Targets'        =>
        [
          [
            'Unix CMD',
            {
              'Platform' => 'unix',
              'Arch' => ARCH_CMD,
              'Payload' => {
                'Space' => 2048,
                'BadChars' => "\x00\x0A\x0D",
                'DisableNops' => true,
                'Compat' =>
                {
                  'PayloadType' => 'cmd',
                  'RequiredCmd' => 'generic perl python netcat php'
                }
              }
            }
          ],
          [
            'Linux',
            {
              'Platform' => 'linux',
              'Arch'     => [ARCH_X86,ARCH_X64],
            }
          ],
    
  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Xymon useradm Command Execution',
      'Description' => %q{
        This module exploits a command injection vulnerability in Xymon
        versions before 4.3.25 which allows authenticated users
        to execute arbitrary operating system commands as the web
        server user.

        When adding a new user to the system via the web interface with
        `useradm.sh`, the user's username and password are passed to
        `htpasswd` in a call to `system()` without validation.

        This module has been tested successfully on Xymon version 4.3.10
        on Debian 6.
      },
      'License'     => MSF_LICENSE,
      'Author'      => [
        'Markus Krell', # Discovery
        'bcoles'        # Metasploit
      ],
      'References'  =>
        [
          ['CVE', '2016-2056'],
          ['PACKETSTORM', '135758'],
          ['URL', 'https://lists.xymon.com/pipermail/xymon/2016-February/042986.html'],
          ['URL', 'https://www.securityfocus.com/archive/1/537522/100/0/threaded'],
          ['URL', 'https://sourceforge.net/p/xymon/code/7892/'],
          ['URL', 'https://www.debian.org/security/2016/dsa-3495']
        ],
      'DisclosureDate' => '2016-02-14',
      'Platform'       => %w(unix linux solaris bsd),
      'Targets'        =>
        [
          [
            'Unix CMD',
            {
              'Platform' => 'unix',
              'Arch' => ARCH_CMD,
              'Payload' => {
                'Space' => 2048,
                'BadChars' => "\x00\x0A\x0D",
                'DisableNops' => true,
                'Compat' =>
                {
                  'PayloadType' => 'cmd',
                  'RequiredCmd' => 'generic perl python netcat php'
                }
              }
            }
          ],
          [
            'Linux',
            {
              'Platform' => 'linux',
              'Arch'     => [ARCH_X86,ARCH_X64],
            }
          ],
          [
            'Solaris',
            {
              'Platform' => 'solaris',
              'Arch' => [ARCH_X86]
            }
          ],
          [
            'BSD',
            {
              'Platform' => 'bsd',
              'Arch' => [ARCH_X86, ARCH_X64]
            }
          ]
        ],
      'Privileged'     => false,
      'DefaultTarget'  => 0))
    register_options([
      OptString.new('TARGETURI', [
        true, 'The base path to Xymon secure CGI directory', '/xymon-seccgi/'
      ]),
      OptString.new('USERNAME', [true, 'The username for Xymon']),
      OptString.new('PASSWORD', [true, 'The password for Xymon'])
    ])
  end