custom devise session controller for active directory users

active_directory.rb

  def self.authenticate_user(username,password)
    ldap = Net::LDAP.new
    ldap.host = ActiveDirectory.first.host
    ldap.port = 389
    ldap.auth username, password
    if ldap.bind
      {:results =>  "successful", :message => "user authenticated"}
    else
      { :results =>  "error", :message =>  ldap.get_operation_result.message}
    end
  end

sessions_controller.rb

def create
    user = User.find_by_username(params[:user][:username])
    password = params[:user][:password]
    if user && user.user_type == "active directory"
      results = ActiveDirectory.authenticate_user(user.username,password)
      if results.fetch(:results) == "successful"
      
        begin
          user.password = password
          user.password_confirmation = password
          user.save
        rescue Exception => e
         logger.debug "~~~~~~~~~~~~~~~~~~~~~~~~EXCEPTION::#{e}"
        end
        
        if user.save!
          super
        else
          redirect_to root_path, :error => "There was a problem signing in."
        end
      else
        redirect_to root_path
        flash[:error] =  "Invalid username or password"
      end
    else
      super
    end
  end