# frozen_string_literal: true

# A custom validator to check that the field value is a URL.
#
#   validates :my_url, url: true
#
class UrlValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    record.errors[attribute] << (options[:message] || "must be a valid URL") unless url_valid?(value)
  end

  # a URL may be technically well-formed but may
  # not actually be valid, so this checks for both.
  def url_valid?(url)
    url = URI.parse(url)
    (url.is_a?(URI::HTTP) || url.is_a?(URI::HTTPS)) && url.host.present?
  rescue URI::InvalidURIError
    false
  end
end