def _new_conn()

in lambda/source/elasticsearch/requests/packages/urllib3/contrib/ntlmpool.py [0:0]
50 lines of code
7 McCabe index (conditional complexity)

    def _new_conn(self):
        # Performs the NTLM handshake that secures the connection. The socket
        # must be kept open while requests are performed.
        self.num_connections += 1
        log.debug('Starting NTLM HTTPS connection no. %d: https://%s%s' %
                  (self.num_connections, self.host, self.authurl))

        headers = {}
        headers['Connection'] = 'Keep-Alive'
        req_header = 'Authorization'
        resp_header = 'www-authenticate'

        conn = HTTPSConnection(host=self.host, port=self.port)

        # Send negotiation message
        headers[req_header] = (
            'NTLM %s' % ntlm.create_NTLM_NEGOTIATE_MESSAGE(self.rawuser))
        log.debug('Request headers: %s' % headers)
        conn.request('GET', self.authurl, None, headers)
        res = conn.getresponse()
        reshdr = dict(res.getheaders())
        log.debug('Response status: %s %s' % (res.status, res.reason))
        log.debug('Response headers: %s' % reshdr)
        log.debug('Response data: %s [...]' % res.read(100))

        # Remove the reference to the socket, so that it can not be closed by
        # the response object (we want to keep the socket open)
        res.fp = None

        # Server should respond with a challenge message
        auth_header_values = reshdr[resp_header].split(', ')
        auth_header_value = None
        for s in auth_header_values:
            if s[:5] == 'NTLM ':
                auth_header_value = s[5:]
        if auth_header_value is None:
            raise Exception('Unexpected %s response header: %s' %
                            (resp_header, reshdr[resp_header]))

        # Send authentication message
        ServerChallenge, NegotiateFlags = \
            ntlm.parse_NTLM_CHALLENGE_MESSAGE(auth_header_value)
        auth_msg = ntlm.create_NTLM_AUTHENTICATE_MESSAGE(ServerChallenge,
                                                         self.user,
                                                         self.domain,
                                                         self.pw,
                                                         NegotiateFlags)
        headers[req_header] = 'NTLM %s' % auth_msg
        log.debug('Request headers: %s' % headers)
        conn.request('GET', self.authurl, None, headers)
        res = conn.getresponse()
        log.debug('Response status: %s %s' % (res.status, res.reason))
        log.debug('Response headers: %s' % dict(res.getheaders()))
        log.debug('Response data: %s [...]' % res.read()[:100])
        if res.status != 200:
            if res.status == 401:
                raise Exception('Server rejected request: wrong '
                                'username or password')
            raise Exception('Wrong server response: %s %s' %
                            (res.status, res.reason))

        res.fp = None
        log.debug('Connection established')
        return conn