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# frozen_string_literal: true
class ResolveAccountService < BaseService
include JsonLdHelper
DFRN_NS = 'http://purl.org/macgirvin/dfrn/1.0'
# Find or create a local account for a remote user.
# When creating, look up the user's webfinger and fetch all
# important information from their feed
# @param [String, Account] uri User URI in the form of username@domain
# @param [Hash] options
# @return [Account]
def call(uri, options = {})
@options = options
if uri.is_a?(Account)
@account = uri
@username = @account.username
@domain = @account.domain
uri = "#{@username}@#{@domain}"
return @account if @account.local? || !webfinger_update_due?
else
@username, @domain = uri.split('@')
return Account.find_local(@username) if TagManager.instance.local_domain?(@domain)
@account = Account.find_remote(@username, @domain)
return @account unless webfinger_update_due?
end
Rails.logger.debug "Looking up webfinger for #{uri}"
@webfinger = Goldfinger.finger("acct:#{uri}")
confirmed_username, confirmed_domain = @webfinger.subject.gsub(/\Aacct:/, '').split('@')
if confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?
@username = confirmed_username
@domain = confirmed_domain
elsif options[:redirected].nil?
return call("#{confirmed_username}@#{confirmed_domain}", options.merge(redirected: true))
else
Rails.logger.debug 'Requested and returned acct URIs do not match'
return
end
return unless activitypub_ready?
return Account.find_local(@username) if TagManager.instance.local_domain?(@domain)
RedisLock.acquire(lock_options) do |lock|
if lock.acquired?
@account = Account.find_remote(@username, @domain)
handle_activitypub if activitypub_ready?
else
raise Mastodon::RaceConditionError
end
end
@account
rescue Goldfinger::Error => e
Rails.logger.debug "Webfinger query for #{uri} unsuccessful: #{e}"
nil
end
private
def webfinger_update_due?
@account.nil? || @account.inbox_url.blank? || (!@options[:skip_webfinger] && @account.possibly_stale?)
end
def activitypub_ready?
!@webfinger.link('self').nil? &&
['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(@webfinger.link('self').type) &&
!actor_json.nil? &&
actor_json['inbox'].present?
end
def handle_activitypub
return if actor_json.nil?
@account = ActivityPub::ProcessAccountService.new.call(@username, @domain, actor_json)
rescue Oj::ParseError
nil
end
def actor_url
@actor_url ||= @webfinger.link('self').href
end
def actor_json
return @actor_json if defined?(@actor_json)
json = fetch_resource(actor_url, false)
@actor_json = supported_context?(json) && equals_or_includes_any?(json['type'], ActivityPub::FetchRemoteAccountService::SUPPORTED_TYPES) ? json : nil
end
def lock_options
{ redis: Redis.current, key: "resolve:#{@username}@#{@domain}" }
end
end
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