How to use the fido2.cbor.decode function in fido2

def test_EdDSA_parse_verify(self):
        key = CoseKey.parse(cbor.decode(_EdDSA_KEY))
        self.assertIsInstance(key, EdDSA)
        self.assertEqual(
            key,
            {
                1: 1,
                3: -8,
                -1: 6,
                -2: a2b_hex(
                    "EE9B21803405D3CF45601E58B6F4C06EA93862DE87D3AF903C5870A5016E86F5"
                ),
            },
        )
        try:
            key.verify(
                a2b_hex(
                    b"a379a6f6eeafb9a55e378c118034e2751e682fab9f2d30ab13d2125586ce1947010000000500a11a323057d1103784ddff99a354ddd42348c2f00e88d8977b916cabf92268"  # noqa E501

def send_cbor(
        self, cmd, data=None, event=None, parse=cbor.decode, on_keepalive=None
    ):
        """Sends a CBOR message to the device, and waits for a response.

        :param cmd: The command byte of the request.
        :param data: The payload to send (to be CBOR encoded).
        :param event: Optional threading.Event used to cancel the request.
        :param parse: Function used to parse the binary response data, defaults
            to parsing the CBOR.
        :param on_keepalive: Optional function called when keep-alive is sent by
            the authenticator.
        :return: The result of calling the parse function on the response data
            (defaults to the CBOR decoded value).
        """
        request = struct.pack(">B", cmd)
        if data is not None:
            request += cbor.encode(data)

def register_complete():
    data = cbor.decode(request.get_data())
    client_data = ClientData(data["clientDataJSON"])
    att_obj = AttestationObject(data["attestationObject"])
    print("clientData", client_data)
    print("AttestationObject:", att_obj)

    auth_data = server.register_complete(session["state"], client_data, att_obj)

    credentials.append(auth_data.credential_data)
    print("REGISTERED CREDENTIAL:", auth_data.credential_data)
    return cbor.encode({"status": "OK"})

the authenticator.
        :return: The result of calling the parse function on the response data
            (defaults to the CBOR decoded value).
        """
        request = struct.pack(">B", cmd)
        if data is not None:
            request += cbor.encode(data)
        response = self.device.call(CTAPHID.CBOR, request, event, on_keepalive)
        status = six.indexbytes(response, 0)
        if status != 0x00:
            raise CtapError(status)
        if len(response) == 1:
            return None
        enc = response[1:]
        if self._strict_cbor:
            expected = cbor.encode(cbor.decode(enc))
            if expected != enc:
                enc_h = b2a_hex(enc)
                exp_h = b2a_hex(expected)
                raise ValueError(
                    "Non-canonical CBOR from Authenticator.\n"
                    "Got: {}\n".format(enc_h) + "Expected: {}".format(exp_h)
                )
        return parse(enc)

def register_complete():
    data = cbor.decode(request.get_data())
    client_data = ClientData(data["clientDataJSON"])
    att_obj = AttestationObject(data["attestationObject"])
    print("clientData", client_data)
    print("AttestationObject:", att_obj)

    auth_data = server.register_complete(session["state"], client_data, att_obj)

    credentials.append(auth_data.credential_data)
    print("REGISTERED CREDENTIAL:", auth_data.credential_data)
    return cbor.encode({"status": "OK"})