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* Increase DNS timeout from 1 second to 5 seconds for MX check 1 seconds is rather short when using a recursive DNS resolver which hasn't got a cached result already available. Use 5 seconds instead, which is the timeout value we use for outgoing HTTP queries. * Add more precise error messages for invalid e-mail addresses
55 lines
1.3 KiB
Ruby
55 lines
1.3 KiB
Ruby
# 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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domain = get_domain(user.email)
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if domain.nil?
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user.errors.add(:email, I18n.t('users.invalid_email'))
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else
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ips, hostnames = resolve_mx(domain)
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if ips.empty?
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user.errors.add(:email, I18n.t('users.invalid_email_mx'))
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elsif on_blacklist?(hostnames + ips)
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user.errors.add(:email, I18n.t('users.blocked_email_provider'))
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end
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end
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end
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private
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def get_domain(value)
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_, domain = value.split('@', 2)
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return nil if domain.nil?
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TagManager.instance.normalize_domain(domain)
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rescue Addressable::URI::InvalidURIError
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nil
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end
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def resolve_mx(domain)
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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 = 5
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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, hostnames]
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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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