41 lines
1.0 KiB
Ruby
41 lines
1.0 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
require 'resolv'
|
|
|
|
class EmailMxValidator < ActiveModel::Validator
|
|
def validate(user)
|
|
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?
|
|
|
|
domain = TagManager.instance.normalize_domain(domain)
|
|
hostnames = []
|
|
ips = []
|
|
|
|
Resolv::DNS.open do |dns|
|
|
dns.timeouts = 1
|
|
|
|
hostnames = dns.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
|
|
|
|
([domain] + hostnames).uniq.each do |hostname|
|
|
ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::A).to_a.map { |e| e.address.to_s })
|
|
ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::AAAA).to_a.map { |e| e.address.to_s })
|
|
end
|
|
end
|
|
|
|
ips.empty? || on_blacklist?(hostnames + ips)
|
|
rescue Addressable::URI::InvalidURIError
|
|
true
|
|
end
|
|
|
|
def on_blacklist?(values)
|
|
EmailDomainBlock.where(domain: values.uniq).any?
|
|
end
|
|
end
|