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# 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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return if Rails.env.test? || Rails.env.development?
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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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records = Resolv::DNS.new.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
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records.empty? || on_blacklist?(records)
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end
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def on_blacklist?(values)
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EmailDomainBlock.where(domain: values).any?
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end
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end
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