mastodon/app/services/activitypub/fetch_remote_account_service.rb
Eugen Rochko 7d985f2aac
Remove dependency on goldfinger gem (#14919)
There are edge cases where requests to certain hosts timeout when
using the vanilla HTTP.rb gem, which the goldfinger gem uses. Now
that we no longer need to support OStatus servers, webfinger logic
is so simple that there is no point encapsulating it in a gem, so
we can just use our own Request class. With that, we benefit from
more robust timeout code and IPv4/IPv6 resolution.

Fix #14091
2020-10-08 00:34:57 +02:00

67 lines
2.1 KiB
Ruby

# frozen_string_literal: true
class ActivityPub::FetchRemoteAccountService < BaseService
include JsonLdHelper
include DomainControlHelper
include WebfingerHelper
SUPPORTED_TYPES = %w(Application Group Organization Person Service).freeze
# Does a WebFinger roundtrip on each call, unless `only_key` is true
def call(uri, id: true, prefetched_body: nil, break_on_redirect: false, only_key: false)
return if domain_not_allowed?(uri)
return ActivityPub::TagManager.instance.uri_to_resource(uri, Account) if ActivityPub::TagManager.instance.local_uri?(uri)
@json = begin
if prefetched_body.nil?
fetch_resource(uri, id)
else
body_to_json(prefetched_body, compare_id: id ? uri : nil)
end
end
return if !supported_context? || !expected_type? || (break_on_redirect && @json['movedTo'].present?)
@uri = @json['id']
@username = @json['preferredUsername']
@domain = Addressable::URI.parse(@uri).normalized_host
return unless only_key || verified_webfinger?
ActivityPub::ProcessAccountService.new.call(@username, @domain, @json, only_key: only_key)
rescue Oj::ParseError
nil
end
private
def verified_webfinger?
webfinger = webfinger!("acct:#{@username}@#{@domain}")
confirmed_username, confirmed_domain = split_acct(webfinger.subject)
return webfinger.link('self', 'href') == @uri if @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
webfinger = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
@username, @domain = split_acct(webfinger.subject)
return false unless @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
return false if webfinger.link('self', 'href') != @uri
true
rescue Webfinger::Error
false
end
def split_acct(acct)
acct.gsub(/\Aacct:/, '').split('@')
end
def supported_context?
super(@json)
end
def expected_type?
equals_or_includes_any?(@json['type'], SUPPORTED_TYPES)
end
end