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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
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