Contents

# Ensure an attribute is generally formatted as an email.
# eg: validates :user_email, email: true
#     validates :user_email, email: {allow_unicode: true}

require_relative 'hostname_validator'

module ActiveModel::Validations
  class EmailValidator < ActiveModel::EachValidator

    EMAIL_REGEXP       = /\A([a-z0-9._+-]+)@((?:[a-z0-9-]+\.)+[a-z]{2,})\z/i
    SEGMENT_REGEXP     = /\A[a-z0-9_+-]+\z/i
    LABEL_REGEXP       = %r{\A([a-zA-Z0-9]([a-zA-Z0-9-]+)?)?[a-zA-Z0-9]\z}
      # HostnameValidator::LABEL_REGEXP minus _/
    FINAL_LABEL_REGEXP = HostnameValidator::FINAL_LABEL_REGEXP

    def validate_each(record, attribute, value)
      unless email_valid?(value, **options.slice(:allow_unicode))
        record.errors.add(attribute, :invalid_email, **options.merge(value: value))
      end
    end

    def email_valid?(value, allow_unicode: false)
      return unless value
      recipient, domain = value.to_s.split('@', 2)
      is_valid = true

      recipient ||= ''
      is_valid &&= recipient.length <= 255
      is_valid &&= recipient !~ /\.\./
      is_valid &&= !recipient.starts_with?('.')
      is_valid &&= !recipient.ends_with?('.')
      recipient.split('.').each do |segment|
        is_valid &&= segment =~ SEGMENT_REGEXP
      end

      domain ||= ''
      if allow_unicode && defined?(Addressable::IDNA)
        domain &&= Addressable::IDNA.to_ascii(domain)
      end
      labels = domain.split('.')
      is_valid &&= domain.length <= 255
      is_valid &&= domain !~ /\.\./
      is_valid &&= labels.size.in? 2..100
      labels.each_with_index do |label, idx|
        is_valid &&= label.length <= 63
        if idx+1==labels.size
          is_valid &&= label =~ FINAL_LABEL_REGEXP
        else
          is_valid &&= label =~ LABEL_REGEXP
        end
      end

      is_valid
    end

  end
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
can_has_validations-1.10.0	lib/can_has_validations/validators/email_validator.rb
can_has_validations-1.9.0	lib/can_has_validations/validators/email_validator.rb
can_has_validations-1.8.2	lib/can_has_validations/validators/email_validator.rb
can_has_validations-1.8.1	lib/can_has_validations/validators/email_validator.rb
can_has_validations-1.8.0	lib/can_has_validations/validators/email_validator.rb