Warden basic http authentication

gistfile1.rb

Warden::Strategies.add(:basic) do
  
  def auth
    @auth ||= Rack::Auth::Basic::Request.new(env)
  end
  
  def valid?
    auth.provided? && auth.basic? && auth.credentials
  end
  
  def authenticate!
    user = User.authenticate(
      auth.credentials.first,
      auth.credentials.last
    )
    user.nil? ? custom!(unauthorized) : success!(user)
  end
  
  def store?
    false
  end
  
  def unauthorized
    [
      401,
      {
        'Content-Type' => 'text/plain',
        'Content-Length' => '0',
        'WWW-Authenticate' => %(Basic realm="realm")
      },
      []
      ]
  end
end