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# frozen_string_literal: true
class ResolveRemoteAccountService < BaseService
include OStatus2::MagicKey
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] uri User URI in the form of username@domain
# @return [Account]
def call(uri, update_profile = true, redirected = nil)
@username, @domain = uri.split('@')
@update_profile = update_profile
return Account.find_local(@username) if TagManager.instance.local_domain?(@domain)
@account = Account.find_remote(@username, @domain)
return @account unless webfinger_update_due?
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 redirected.nil?
return call("#{confirmed_username}@#{confirmed_domain}", update_profile, true)
else
Rails.logger.debug 'Requested and returned acct URIs do not match'
return
end
return if links_missing?
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)
if activitypub_ready? || @account&.activitypub?
handle_activitypub
else
handle_ostatus
end
end
end
@account
rescue Goldfinger::Error => e
Rails.logger.debug "Webfinger query for #{uri} unsuccessful: #{e}"
nil
end
private
def links_missing?
!(activitypub_ready? || ostatus_ready?)
end
def ostatus_ready?
!(@webfinger.link('http://schemas.google.com/g/2010#updates-from').nil? ||
@webfinger.link('salmon').nil? ||
@webfinger.link('http://webfinger.net/rel/profile-page').nil? ||
@webfinger.link('magic-public-key').nil? ||
canonical_uri.nil? ||
hub_url.nil?)
end
def webfinger_update_due?
@account.nil? || @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_ostatus
create_account if @account.nil?
update_account
update_account_profile if update_profile?
end
def update_profile?
@update_profile
end
def handle_activitypub
return if actor_json.nil?
@account = ActivityPub::ProcessAccountService.new.call(@username, @domain, actor_json)
rescue Oj::ParseError
nil
end
def create_account
Rails.logger.debug "Creating new remote account for #{@username}@#{@domain}"
@account = Account.new(username: @username, domain: @domain)
@account.suspended = true if auto_suspend?
@account.silenced = true if auto_silence?
@account.private_key = nil
end
def update_account
@account.last_webfingered_at = Time.now.utc
@account.protocol = :ostatus
@account.remote_url = atom_url
@account.salmon_url = salmon_url
@account.url = url
@account.public_key = public_key
@account.uri = canonical_uri
@account.hub_url = hub_url
@account.save!
end
def auto_suspend?
domain_block&.suspend?
end
def auto_silence?
domain_block&.silence?
end
def domain_block
return @domain_block if defined?(@domain_block)
@domain_block = DomainBlock.find_by(domain: @domain)
end
def atom_url
@atom_url ||= @webfinger.link('http://schemas.google.com/g/2010#updates-from').href
end
def salmon_url
@salmon_url ||= @webfinger.link('salmon').href
end
def actor_url
@actor_url ||= @webfinger.link('self').href
end
def url
@url ||= @webfinger.link('http://webfinger.net/rel/profile-page').href
end
def public_key
@public_key ||= magic_key_to_pem(@webfinger.link('magic-public-key').href)
end
def canonical_uri
return @canonical_uri if defined?(@canonical_uri)
author_uri = atom.at_xpath('/xmlns:feed/xmlns:author/xmlns:uri')
if author_uri.nil?
owner = atom.at_xpath('/xmlns:feed').at_xpath('./dfrn:owner', dfrn: DFRN_NS)
author_uri = owner.at_xpath('./xmlns:uri') unless owner.nil?
end
@canonical_uri = author_uri.nil? ? nil : author_uri.content
end
def hub_url
return @hub_url if defined?(@hub_url)
hubs = atom.xpath('//xmlns:link[@rel="hub"]')
@hub_url = hubs.empty? || hubs.first['href'].nil? ? nil : hubs.first['href']
end
def atom_body
return @atom_body if defined?(@atom_body)
response = Request.new(:get, atom_url).perform
raise Mastodon::UnexpectedResponseError, response unless response.code == 200
@atom_body = response.to_s
end
def actor_json
return @actor_json if defined?(@actor_json)
json = fetch_resource(actor_url, false)
@actor_json = supported_context?(json) && json['type'] == 'Person' ? json : nil
end
def atom
return @atom if defined?(@atom)
@atom = Nokogiri::XML(atom_body)
end
def update_account_profile
RemoteProfileUpdateWorker.perform_async(@account.id, atom_body.force_encoding('UTF-8'), false)
end
def lock_options
{ redis: Redis.current, key: "resolve:#{@username}@#{@domain}" }
end
end
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