2018-05-27 02:58:08 +00:00
|
|
|
# frozen_string_literal: true
|
|
|
|
|
|
|
|
require 'resolv'
|
|
|
|
|
|
|
|
class EmailMxValidator < ActiveModel::Validator
|
|
|
|
def validate(user)
|
2021-03-01 03:59:13 +00:00
|
|
|
return if user.email.blank?
|
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
domain = get_domain(user.email)
|
|
|
|
|
2021-03-01 03:59:13 +00:00
|
|
|
if domain.blank?
|
|
|
|
user.errors.add(:email, :invalid)
|
2020-08-12 10:40:25 +00:00
|
|
|
else
|
|
|
|
ips, hostnames = resolve_mx(domain)
|
2021-03-01 03:59:13 +00:00
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
if ips.empty?
|
2021-03-01 03:59:13 +00:00
|
|
|
user.errors.add(:email, :unreachable)
|
2020-08-12 10:40:25 +00:00
|
|
|
elsif on_blacklist?(hostnames + ips)
|
2021-03-01 03:59:13 +00:00
|
|
|
user.errors.add(:email, :blocked)
|
2020-08-12 10:40:25 +00:00
|
|
|
end
|
|
|
|
end
|
2018-05-27 02:58:08 +00:00
|
|
|
end
|
|
|
|
|
|
|
|
private
|
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
def get_domain(value)
|
2018-05-27 02:58:08 +00:00
|
|
|
_, domain = value.split('@', 2)
|
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
return nil if domain.nil?
|
|
|
|
|
|
|
|
TagManager.instance.normalize_domain(domain)
|
|
|
|
rescue Addressable::URI::InvalidURIError
|
|
|
|
nil
|
|
|
|
end
|
2018-05-27 02:58:08 +00:00
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
def resolve_mx(domain)
|
2018-12-10 21:53:25 +00:00
|
|
|
hostnames = []
|
|
|
|
ips = []
|
2018-07-05 18:57:24 +00:00
|
|
|
|
2018-12-10 21:53:25 +00:00
|
|
|
Resolv::DNS.open do |dns|
|
2020-08-12 10:40:25 +00:00
|
|
|
dns.timeouts = 5
|
2018-12-10 21:53:25 +00:00
|
|
|
|
|
|
|
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 })
|
2019-02-12 13:48:04 +00:00
|
|
|
ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::AAAA).to_a.map { |e| e.address.to_s })
|
2018-12-10 21:53:25 +00:00
|
|
|
end
|
|
|
|
end
|
|
|
|
|
2020-08-12 10:40:25 +00:00
|
|
|
[ips, hostnames]
|
2018-05-27 02:58:08 +00:00
|
|
|
end
|
|
|
|
|
|
|
|
def on_blacklist?(values)
|
2018-12-10 21:53:25 +00:00
|
|
|
EmailDomainBlock.where(domain: values.uniq).any?
|
2018-05-27 02:58:08 +00:00
|
|
|
end
|
|
|
|
end
|