require 'em-http' # # Fetch keys via HKP # http://tools.ietf.org/html/draft-shaw-openpgp-hkp-00 # module Nickserver; module HKP class FetchKey include EM::Deferrable def get(uid) FetchKeyInfo.new.search(uid).callback {|key_info_list| best = pick_best_key(key_info_list) get_key_by_fingerprint(best.keyid) {|key| self.succeed key } }.errback {|status, msg| self.fail status, msg } self end # # fetches ascii armored OpenPGP public key from the keyserver # def get_key_by_fingerprint(key_id) params = {:op => 'get', :search => "0x" + key_id, :exact => 'on', :options => 'mr'} http = EventMachine::HttpRequest.new(Config.hkp_url).get(:query => params) http.callback { if http.response_header.status != 200 self.fail http.response_header.status, "HKP Request failed" else yield http.response end } http.errback { self.fail 500, http.error } end protected # # for now, just pick the newest key. # # in the future, we should perhaps pick the newest key # that is signed by the oldest key. # def pick_best_key(key_info_list) key_info_list.sort {|a,b| a.creationdate <=> b.creationdate}.last end end end; end