Using ClientSideValidations middleware with StrongPassword.

gistfile1.rb

module ClientSideValidations::Middleware
  class PasswordStrength < ClientSideValidations::Middleware::Base
    require 'strong_password'
    def response
      min_entropy = StrongPassword::StrengthChecker::BASE_ENTROPY
      if request.params['min_entropy']
        min_entropy = request.params['min_entropy'].to_f
      end
      entropy = StrongPassword::StrengthChecker.new(request.params['password']).calculate_entropy(use_dictionary: true)
      is_strong = entropy >= min_entropy
      # Body contains percent of min entropy
      percent_entropy = (entropy / min_entropy) * 100
      percent_entropy = 100 if percent_entropy > 100
      percent_entropy = "#{percent_entropy.to_i}%"
      self.body = percent_entropy
      if request.params['password'] && is_strong
        self.status = 200
      else
        self.status = 404
      end
      super
    end
  end
end