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mastodon/app/validators/email_mx_validator.rb

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# frozen_string_literal: true
require 'resolv'
class EmailMxValidator < ActiveModel::Validator
def validate(user)
return if Rails.env.test? || Rails.env.development?
user.errors.add(:email, I18n.t('users.invalid_email')) if invalid_mx?(user.email)
end
private
def invalid_mx?(value)
_, domain = value.split('@', 2)
return true if domain.nil?
records = Resolv::DNS.new.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
records.empty? || on_blacklist?(records)
end
def on_blacklist?(values)
EmailDomainBlock.where(domain: values).any?
end
end