25 lines
599 B
Ruby
25 lines
599 B
Ruby
# frozen_string_literal: true
|
|
|
|
require 'resolv'
|
|
|
|
class EmailMxValidator < ActiveModel::Validator
|
|
def validate(user)
|
|
return if Rails.env.test?
|
|
user.errors.add(:email, I18n.t('users.invalid_email')) if invalid_mx?(user.email)
|
|
end
|
|
|
|
private
|
|
|
|
def invalid_mx?(value)
|
|
_, domain = value.split('@', 2)
|
|
|
|
return true if domain.nil?
|
|
|
|
records = Resolv::DNS.new.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
|
|
records.empty? || on_blacklist?(records)
|
|
end
|
|
|
|
def on_blacklist?(values)
|
|
EmailDomainBlock.where(domain: values).any?
|
|
end
|
|
end
|