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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? |
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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 |