ensure_secret_secure

# File activesupport/lib/active_support/key_generator.rb, line 58
    def ensure_secret_secure(secret)
      if secret.blank?
        raise ArgumentError, "A secret is required to generate an integrity hash "            "for cookie session data. Set a secret_key_base of at least "            "#{SECRET_MIN_LENGTH} characters in config/secrets.yml."
      end

      if secret.length < SECRET_MIN_LENGTH
        raise ArgumentError, "Secret should be something secure, "            "like \"#{SecureRandom.hex(16)}\". The value you "            "provided, \"#{secret}\", is shorter than the minimum length "            "of #{SECRET_MIN_LENGTH} characters."
      end
    end