class FetchRemoteAccountService < BaseService def call(url) atom_url, body = FetchAtomService.new.call(url) return nil if atom_url.nil? return process_atom(atom_url, body) end private def process_atom(url, body) xml = Nokogiri::XML(body) url_parts = Addressable::URI.parse(url) username = xml.at_xpath('//xmlns:author/xmlns:name').try(:content) domain = url_parts.host return nil if username.nil? Rails.logger.debug "Going to webfinger #{username}@#{domain}" return FollowRemoteAccountService.new.call("#{username}@#{domain}") rescue TypeError Rails.logger.debug "Unparseable URL given: #{url}" nil rescue Nokogiri::XML::XPath::SyntaxError Rails.logger.debug "Invalid XML or missing namespace" nil end end