# Configuration Constants (move to yaml ?)
HOST      = 'ad01.domain.local'
PORT      = 636
USER      = 'administrator'
PASS      = 'password'
BASE      = 'dc=domain, dc=local'
DOMAIN    = 'domain.local'
SCOPE     = '(&(objectCategory=person)(objectClass=user))'

require 'rubygems'

begin
  require 'net/ldap'
rescue LoadError => err
  abort "Please run 'sudo gem install net-ldap' to enable connecting to LDAP."
end

begin
  require 'fastercsv'
rescue LoadError => err
  abort "Please run 'sudo gem install fastercsv' to enable connecting to LDAP."
end

class CSVBuilder
  def initialize(head)
    if head.is_a?(Array)
      @head = head
      @rows = Array.new
    else
      raise 'Headers MUST be provided as an array'
    end
  end

  def add_row(row)
    if row.is_a?(Array)
      @rows << FasterCSV::Row.new(@head,row)
    else
      raise 'Row MUST be provided as an array'
    end
  end

  def export(filename='export.csv')
    f = File.open(filename,'w')
    f << FasterCSV::Table.new(@rows)
    f.close
  end
end

ldap = Net::LDAP.new(
  :host       => HOST,
  :port       => PORT,
  :base       => BASE,
  :encryption => :simple_tls,
  :auth       => { :username => "#{USER}@#{DOMAIN}",
                   :password => PASS,
                   :method   => :simple }
)

users = ldap.search(:filter => SCOPE)
csv   = CSVBuilder.new(%w[username name email proxy])

users.each do |user|
  user_name = user[:samaccountname]
  disp_name = user[:displayname]
  email_ady = user[:mail]
  proxy_ady = user[:proxyaddresses]
  csv.add_row([user_name, disp_name, email_ady, proxy_ady])
end

csv.export('ldap.csv')