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37 lines
957 B
37 lines
957 B
# frozen_string_literal: true |
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require 'resolv' |
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class EmailMxValidator < ActiveModel::Validator |
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def validate(user) |
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user.errors.add(:email, I18n.t('users.invalid_email')) if invalid_mx?(user.email) |
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end |
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private |
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def invalid_mx?(value) |
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_, domain = value.split('@', 2) |
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return true if domain.nil? |
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hostnames = [] |
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ips = [] |
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Resolv::DNS.open do |dns| |
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dns.timeouts = 1 |
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hostnames = dns.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s } |
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([domain] + hostnames).uniq.each do |hostname| |
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ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::A).to_a.map { |e| e.address.to_s }) |
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ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::AAAA).to_a.map { |e| e.address.to_s }) |
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end |
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end |
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ips.empty? || on_blacklist?(hostnames + ips) |
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end |
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def on_blacklist?(values) |
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EmailDomainBlock.where(domain: values.uniq).any? |
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end |
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end
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