Contents

require 'uri'
# Allows to check if the value of a specific attribute is a valid URL.
#
# @example Validate that the user's blog URL is valid.
#   class User << ActiveRecord::Base
#     attr_accessor :blog, :name
#     validates :blog, url: true
#   end
class UrlValidator < ActiveModel::EachValidator
  # Checks if an attribute value is a valid URL.
  #
  # @param [Object] record object to validate
  # @param [String] attribute name of the object attribute to validate
  # @param [Object] value attribute value
  def validate_each(record, attribute, value)
    uri = URI.parse(value)

    unless uri.kind_of?(URI::HTTP) \
      && in_valid_top_level_domains?(uri, Array.wrap(options[:domain])) \
      && with_valid_scheme?(uri, Array.wrap(options[:scheme])) \
      && (!!!options[:root] || is_root?(uri))

      raise URI::InvalidURIError
    end

  rescue URI::InvalidURIError
    record.errors[attribute] << (options[:message] || I18n.t('errors.messages.url'))
  end

  private

  def in_valid_top_level_domains?(uri, tlds)
    host_downcased = uri.host.downcase
    tlds.empty? || tlds.map(&:downcase).any? { |domain| host_downcased.end_with?(".#{domain}") }
  end

  def with_valid_scheme?(uri, schemes)
    scheme_downcased = uri.scheme.downcase
    schemes.empty? || schemes.map(&:to_s).map(&:downcase).any? { |scheme| scheme_downcased == scheme }
  end

  def is_root?(uri)
    ['/', ''].include?(uri.path) && uri.query.blank? && uri.fragment.blank?
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
missing_validators-0.6.0	lib/missing_validators/validators/url_validator.rb