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# frozen_string_literal: true
class ActivityPub::FetchRemoteAccountService < BaseService
include JsonLdHelper
SUPPORTED_TYPES = %w(Application Group Organization Person Service).freeze
# Should be called when uri has already been checked for locality
# Does a WebFinger roundtrip on each call
def call(uri, id: true, prefetched_body: nil)
@json = if prefetched_body.nil?
fetch_resource(uri, id)
else
body_to_json(prefetched_body)
end
return unless supported_context? && expected_type?
@uri = @json['id']
@username = @json['preferredUsername']
@domain = Addressable::URI.parse(@uri).normalized_host
return unless verified_webfinger?
ActivityPub::ProcessAccountService.new.call(@username, @domain, @json)
rescue Oj::ParseError
nil
end
private
def verified_webfinger?
webfinger = Goldfinger.finger("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 = Goldfinger.finger("acct:#{confirmed_username}@#{confirmed_domain}")
@username, @domain = split_acct(webfinger.subject)
self_reference = webfinger.link('self')
return false unless @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
return false if self_reference&.href != @uri
true
rescue Goldfinger::Error
false
end
def split_acct(acct)
acct.gsub(/\Aacct:/, '').split('@')
end
def supported_context?
super(@json)
end
def expected_type?
SUPPORTED_TYPES.include?(@json['type'])
end
end
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