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# Copyright 2012-2014, Damian Johnson and The Tor Project
# See LICENSE for licensing information
import binascii
import stem.response
import stem.socket
import stem.util.str_tools
import stem.util.tor_tools
class AuthChallengeResponse(stem.response.ControlMessage):
"""
AUTHCHALLENGE query response.
:var str server_hash: server hash provided by tor
:var str server_nonce: server nonce provided by tor
"""
def _parse_message(self):
# Example:
# 250 AUTHCHALLENGE SERVERHASH=680A73C9836C4F557314EA1C4EDE54C285DB9DC89C83627401AEF9D7D27A95D5 SERVERNONCE=F8EA4B1F2C8B40EF1AF68860171605B910E3BBCABADF6FC3DB1FA064F4690E85
self.server_hash = None
self.server_nonce = None
if not self.is_ok():
raise stem.ProtocolError("AUTHCHALLENGE response didn't have an OK status:\n%s" % self)
elif len(self) > 1:
raise stem.ProtocolError('Received multiline AUTHCHALLENGE response:\n%s' % self)
line = self[0]
# sanity check that we're a AUTHCHALLENGE response
if not line.pop() == 'AUTHCHALLENGE':
raise stem.ProtocolError('Message is not an AUTHCHALLENGE response (%s)' % self)
if line.is_next_mapping('SERVERHASH'):
value = line.pop_mapping()[1]
if not stem.util.tor_tools.is_hex_digits(value, 64):
raise stem.ProtocolError('SERVERHASH has an invalid value: %s' % value)
self.server_hash = binascii.a2b_hex(stem.util.str_tools._to_bytes(value))
else:
raise stem.ProtocolError('Missing SERVERHASH mapping: %s' % line)
if line.is_next_mapping('SERVERNONCE'):
value = line.pop_mapping()[1]
if not stem.util.tor_tools.is_hex_digits(value, 64):
raise stem.ProtocolError('SERVERNONCE has an invalid value: %s' % value)
self.server_nonce = binascii.a2b_hex(stem.util.str_tools._to_bytes(value))
else:
raise stem.ProtocolError('Missing SERVERNONCE mapping: %s' % line)
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