```ruby
# Filters added to this controller apply to all controllers in the application.
# Likewise, all the methods added will be available for all controllers.

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time
  protect_from_forgery # See ActionController::RequestForgeryProtection for details

  helper_method :logged_in?, :admin?

  before_filter :require_website, :initialize_user

  protected

  def logged_in?
    @current_user.is_a?(User)
  end

  def admin?
    logged_in? and @current_user.admin
  end

  def admin_required
    unless admin?
      redirect_to :controller => 'sessions', :action => 'new'
    end
  end

  # setup user info on each page
  def initialize_user
    @current_user = User.find_by_id(session[:user])
  end

  def set_cookie_domain(domain)
    cookies = session.instance_eval("@dbprot")
    unless cookies.blank?
      cookies.each do |cookie|
        options = cookie.instance_eval("@cookie_options")
        options["domain"] = domain unless options.blank?
      end
    end
  end

  def require_website
    @w = Website.for(request.host, request.subdomains)
    if @w
      if request.host == @w.domain
        set_cookie_domain(@w.domain)
      end
    else
      redirect_to "http://#{MAIN_HOST}:#{request.port}"
    end
  end
  # Scrub sensitive parameters from your log
  # filter_parameter_logging :password
end
```

Include flash notice when admin is required
user
```ruby
# Filters added to this controller apply to all controllers in the application.
# Likewise, all the methods added will be available for all controllers.

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time
  protect_from_forgery # See ActionController::RequestForgeryProtection for details

  helper_method :logged_in?, :admin?

  before_filter :require_website, :initialize_user

  protected

  def logged_in?
    @current_user.is_a?(User)
  end

  def admin?
    logged_in? and @current_user.admin
  end

  def admin_required
    unless admin?
      flash[:notice] = 'You need to be logged in as an administrator to do that.'
      redirect_to :controller => 'sessions', :action => 'new'
    end
  end

  # setup user info on each page
  def initialize_user
    @current_user = User.find_by_id(session[:user])
  end

  def set_cookie_domain(domain)
    cookies = session.instance_eval("@dbprot")
    unless cookies.blank?
      cookies.each do |cookie|
        options = cookie.instance_eval("@cookie_options")
        options["domain"] = domain unless options.blank?
      end
    end
  end

  def require_website
    @w = Website.for(request.host, request.subdomains)
    if @w
      if request.host == @w.domain
        set_cookie_domain(@w.domain)
      end
    else
      redirect_to "http://#{MAIN_HOST}:#{request.port}"
    end
  end
  # Scrub sensitive parameters from your log
  # filter_parameter_logging :password
end
```
assistant