ActiveModel HttpUrlValidator

http_url_validator.rb

# frozen_string_literal: true
module Validators
  class HttpUrlValidator < ActiveModel::EachValidator

    GENERIC_URI_FORMAT = /^((ftp|http|https):\/\/)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/ix

    def validate_each(record, attribute, value)
      uri = parse_uri(value)
      record.errors.add(attribute, :bad_uri, options) unless uri
    end

    private

    def parse_uri(value)
      return unless value
      uri = URI.parse(value)

      # Works for both http and https
      if uri.kind_of?(URI::HTTP)
        uri.scheme && uri.host && uri
      elsif uri.kind_of?(URI::Generic)
        uri.path.match(GENERIC_URI_FORMAT)
      end

    rescue URI::InvalidURIError, URI::InvalidURIError, TypeError
    end

  end
end