# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/

class Auth
  include ApplicationLib

=begin

authenticate user via username and password

  result = Auth.check( username, password, user )

returns

  result = user_model # if authentication was successfully

=end

  def self.check(username, password, user)

    # use std. auth backends
    config = [
      {
        adapter: 'Auth::Internal',
      },
      {
        adapter: 'Auth::Developer',
      },
    ]

    # added configured backends
    Setting.where( area: 'Security::Authentication' ).each {|setting|
      if setting.state[:value]
        config.push setting.state[:value]
      end
    }

    # try to login against configure auth backends
    user_auth = nil
    config.each {|config_item|
      next if !config_item[:adapter]

      # load backend
      backend = self.load_adapter( config_item[:adapter] )
      next if !backend

      user_auth = backend.check( username, password, config_item, user )

      # auth ok
      if user_auth

        Rails.logger.info "Authentication against #{config_item[:adapter]} for user #{user_auth.login} ok."

        # remember last login date
        user_auth.update_last_login

        return user_auth
      end
    }
    nil
  end
end