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# frozen_string_literal: true
class ActivityPub::FetchRemoteActorService < BaseService
include JsonLdHelper
include DomainControlHelper
include WebfingerHelper
class Error < StandardError; end
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, suppress_errors: true, request_id: nil)
return if domain_not_allowed?(uri)
return ActivityPub::TagManager.instance.uri_to_actor(uri) 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
rescue Oj::ParseError
raise Error, "Error parsing JSON-LD document #{uri}"
end
raise Error, "Error fetching actor JSON at #{uri}" if @json.nil?
raise Error, "Unsupported JSON-LD context for document #{uri}" unless supported_context?
raise Error, "Unexpected object type for actor #{uri} (expected any of: #{SUPPORTED_TYPES})" unless expected_type?
raise Error, "Actor #{uri} has moved to #{@json['movedTo']}" if break_on_redirect && @json['movedTo'].present?
@uri = @json['id']
@username = @json['preferredUsername']
@domain = Addressable::URI.parse(@uri).normalized_host
check_webfinger! unless only_key
ActivityPub::ProcessAccountService.new.call(@username, @domain, @json, only_key: only_key, verified_webfinger: !only_key, request_id: request_id)
rescue Error => e
Rails.logger.debug "Fetching actor #{uri} failed: #{e.message}"
raise unless suppress_errors
end
private
def check_webfinger!
webfinger = webfinger!("acct:#{@username}@#{@domain}")
confirmed_username, confirmed_domain = split_acct(webfinger.subject)
if @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
raise Error, "Webfinger response for #{@username}@#{@domain} does not loop back to #{@uri}" if webfinger.link('self', 'href') != @uri
return
end
webfinger = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
@username, @domain = split_acct(webfinger.subject)
unless confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?
raise Webfinger::RedirectError, "Too many webfinger redirects for URI #{@uri} (stopped at #{@username}@#{@domain})"
end
raise Error, "Webfinger response for #{@username}@#{@domain} does not loop back to #{@uri}" if webfinger.link('self', 'href') != @uri
rescue Webfinger::RedirectError => e
raise Error, e.message
rescue Webfinger::Error => e
raise Error, "Webfinger error when resolving #{@username}@#{@domain}: #{e.message}"
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
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