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mastodon/app/services/resolve_account_service.rb
Akihiko Odaki 40e5d2303b Validate HTTP response length while receiving (#6891)
to_s method of HTTP::Response keeps blocking while it receives the whole
content, no matter how it is big. This means it may waste time to receive
unacceptably large files. It may also consume memory and disk in the
process. This solves the inefficency by checking response length while
receiving.
2018-03-26 14:02:10 +02:00

208 lines
5.7 KiB
Ruby

# frozen_string_literal: true
class ResolveAccountService < 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)
@atom_body = Request.new(:get, atom_url).perform do |response|
raise Mastodon::UnexpectedResponseError, response unless response.code == 200
response.body_with_limit
end
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