gistfile1.rb

class CmuLdap
  BASE_DN = 'ou=Person, dc=cmu, dc=edu'
  
  def self.find_by_principal_name(name)
    new.search(:filter => Net::LDAP::Filter.eq('cmuPersonPrincipalName', name))
  end

  def self.find_by_andrew_id(username)
    new.search(:filter => Net::LDAP::Filter.eq('cmuAndrewID', username))
  end

  def initialize
    @ldap = Net::LDAP.new(:host => 'ldap.andrew.cmu.edu', :port => 389)
  end

  def search(opts = {})
    options = {
      :base => BASE_DN,
      :attributes => [
        'givenName', 'sn', 'nickname', 'eduPersonSchoolCollegeName',
        'cmuStudentClass', 'mail', 'cmuPreferredMail'
      ]
    }.merge!(opts)
    
    @ldap.search(options) do |entry|
      results = {}
      entry.each do |attribute, values|
        results[attribute] = values.first
      end
      return results
    end
    
    return nil
  end
end