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# frozen_string_literal: true
require 'resolv'
class VerifyPagesDomainService < BaseService
# The maximum number of seconds to be spent on each DNS lookup
RESOLVER_TIMEOUT_SECONDS = 15
# How long verification lasts for
VERIFICATION_PERIOD = 7.days
REMOVAL_DELAY = 1.week.freeze
attr_reader :domain
def initialize(domain)
@domain = domain
end
def execute
return error("No verification code set for #{domain.domain}") unless domain.verification_code.present?
if !verification_enabled? || dns_record_present?
verify_domain!
elsif expired?
disable_domain!
else
unverify_domain!
end
end
private
def verify_domain!
was_disabled = !domain.enabled?
was_unverified = domain.unverified?
# Prevent any pre-existing grace period from being truncated
reverify = [domain.enabled_until, VERIFICATION_PERIOD.from_now].compact.max
domain.assign_attributes(verified_at: Time.current, enabled_until: reverify, remove_at: nil)
domain.save!(validate: false)
if was_disabled
notify(:enabled)
elsif was_unverified
notify(:verification_succeeded)
end
success
end
def unverify_domain!
was_verified = domain.verified?
domain.assign_attributes(verified_at: nil)
domain.remove_at ||= REMOVAL_DELAY.from_now unless domain.enabled?
domain.save!(validate: false)
notify(:verification_failed) if was_verified
error("Couldn't verify #{domain.domain}")
end
def disable_domain!
domain.assign_attributes(verified_at: nil, enabled_until: nil)
domain.remove_at ||= REMOVAL_DELAY.from_now
domain.save!(validate: false)
notify(:disabled)
error("Couldn't verify #{domain.domain}. It is now disabled.")
end
# A domain is only expired until `disable!` has been called
def expired?
domain.enabled_until && domain.enabled_until < Time.current
end
def dns_record_present?
Resolv::DNS.open do |resolver|
resolver.timeouts = RESOLVER_TIMEOUT_SECONDS
check(domain.domain, resolver) || check(domain.verification_domain, resolver)
end
end
def check(domain_name, resolver)
# Append '.' to domain_name, indicating absolute FQDN
records = parse(txt_records(domain_name + '.', resolver))
records.any? do |record|
record == domain.keyed_verification_code || record == domain.verification_code
end
rescue StandardError => err
log_error("Failed to check TXT records on #{domain_name} for #{domain.domain}: #{err}")
false
end
def txt_records(domain_name, resolver)
resolver.getresources(domain_name, Resolv::DNS::Resource::IN::TXT)
end
def parse(records)
records.flat_map(&:strings).flat_map(&:split)
end
def verification_enabled?
Gitlab::CurrentSettings.pages_domain_verification_enabled?
end
def notify(type)
return unless verification_enabled?
Gitlab::AppLogger.info("Pages domain '#{domain.domain}' changed state to '#{type}'")
notification_service.public_send("pages_domain_#{type}", domain) # rubocop:disable GitlabSecurity/PublicSend
end
end
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