Class: DomainValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/validators/domain_validator.rb

Overview

Validate if a string is a valid domain. This should work with IDN.

validates :domain_column, domain: true

Set a minimum and maximum number of domain parts (aka. labels)

validates :domain_column, domain: { min_domain_parts: 2 }
validates :domain_column, domain: { max_domain_parts: 2 }

Constant Summary collapse

REGEXP =

RFC 1034, section 3.1: Each node has a label, which is zero to 63 octets in length.

RFC 1035, secion 2.3.1: <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

<let-dig> ::= <letter> | <digit>

<letter> ::= any one of the 52 alphabetic characters A through Z in upper case and a through z in lower case

<digit> ::= any one of the ten digits 0 through 9

…

Labels must be 63 characters or less.

TODO: There are more considerations, especially for IDN. RFC5891 section 4.2 lists some.

/
  \A
  [\p{L}\d-]{1,63}  # \p{L} is any unicode character in the category "Letter"
  \z
/ix.freeze

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/validators/domain_validator.rb', line 38

def validate_each record, attribute, value
  parts = value.respond_to?(:split) ? value.split('.') : []

  parts.each do |part|
    record.errors.add attribute, (options[:message] || I18n.t('rails_validations.domain.invalid')) unless part =~ REGEXP
  end

  if options[:max_domain_parts].present? && parts.length > options[:max_domain_parts]
    record.errors.add attribute, (options[:message] || I18n.t('rails_validations.domain.max_domain_parts', max: options[:max_domain_parts]))
  end

  if options[:min_domain_parts].present? && options[:min_domain_parts] > parts.length
    record.errors.add attribute, (options[:message] || I18n.t('rails_validations.domain.min_domain_parts', min: options[:min_domain_parts]))
  end
end