setup.rb

# This file is specifically setup for use with the merb-auth plugin.
# This file should be used to setup and configure your authentication stack.
# It is not required and may safely be deleted.
#
# To change the parameter names for the password or login field you may set either of these two options
#
# Merb::Plugins.config[:"merb-auth"][:login_param]    = :email 
# Merb::Plugins.config[:"merb-auth"][:password_param] = :my_password_field_name

begin
  # Sets the default class ofr authentication.  This is primarily used for 
  # Plugins and the default strategies
  Merb::Authentication.user_class = User


  # Mixin the salted user mixin
  #require 'merb-auth-more/mixins/salted_user'
  #Merb::Authentication.user_class.class_eval{ include Merb::Authentication::Mixins::SaltedUser }

  # Setup the session serialization
  class Merb::Authentication

    def fetch_user(session_user_id)
      Merb::Authentication.user_class.get(session_user_id)
    end

    def store_user(user)
      user.nil? ? user : user.id
    end
  end

rescue
  Merb.logger.error <<-TEXT
  
    You need to setup some kind of user class with merb-auth.  
    Merb::Authentication.user_class = User
    
    If you want to fully customize your authentication you should use merb-core directly.  
    
    See merb/merb-auth/setup.rb and strategies.rb to customize your setup

    TEXT
end

strategies.rb

#
# You should declare you strategies directly and/or use 
# Merb::Authentication.activate!(:label_of_strategy)
#
# To load and set the order of strategy processing

# This file is specifically for you to define your strategies
#
# You should declare you strategies directly and/or use
# Merb::Authentication.activate!(:label_of_strategy)
#
# To load and set the order of strategy processing

# This file is specifically for you to define your strategies
#
# You should declare you strategies directly and/or use
# Merb::Authentication.activate!(:label_of_strategy)
#
# To load and set the order of strategy processing

Merb::Slices::config[:"merb-auth-slice-password"][:no_default_strategies] = true

module Merb::Authentication::Strategies
   class UserAuthentication < Merb::Authentication::Strategy
     def run!
       if params[:username] and params[:password]
         user = User.auth(params[:username], params[:password])
         if !user
           request.session.authentication.errors.add('username',
                                                     "Brukernavn og/eller password var feil")
         end
         user
       end
     end
   end
end