def _revoke_vote_id(voter_code):
elec = Election()
otps = set()
for quest in elec.get_questions():
reg = elec.get_sub_reg(quest)
key = htscommon.get_user_key(voter_code)
if reg.check(key + [htscommon.VOTE_VERIFICATION_ID_FILENAME]):
otp = reg.read_string_value(key, \
htscommon.VOTE_VERIFICATION_ID_FILENAME)
otps.add(otp.value)
evlog.log("Revoking vote ID %s" % otp)
if not _delete_vote_id(otp.value):
evlog.log_error("No such vote-ID: %s" % otp)
otp.delete()
if len(otps) > 1:
evlog.log_error("The voter %s had multiple vote ID-s: %s" % \
(voter_code, ", ".join(otps)))
