def encode(self, is_originating, uri, args=None, kwargs=None):
"""
Encrypt the given WAMP URI, args and kwargs into an EncodedPayload instance, or None
if the URI should not be encrypted.
"""
assert (type(is_originating) == bool)
assert (type(uri) == six.text_type)
assert (args is None or type(args) in (list, tuple))
assert (kwargs is None or type(kwargs) == dict)
box = self._get_box(is_originating, uri)
if not box:
# if we didn't find a crypto box, then return None, which
# signals that the payload travel unencrypted (normal)
return None
payload = {u'uri': uri, u'args': args, u'kwargs': kwargs}
nonce = random(Box.NONCE_SIZE)
payload_ser = _json_dumps(payload).encode('utf8')
payload_encr = box.encrypt(payload_ser, nonce, encoder=RawEncoder)
# above returns an instance of http://pynacl.readthedocs.io/en/latest/utils/#nacl.utils.EncryptedMessage
# which is a bytes _subclass_! hence we apply bytes() to get at the underlying plain
# bytes "scalar", which is the concatenation of `payload_encr.nonce + payload_encr.ciphertext`
payload_bytes = bytes(payload_encr)
payload_key = None
return EncodedPayload(payload_bytes,
u'cryptobox',
u'json',
enc_key=payload_key)
def encode(self, is_originating, uri, args=None, kwargs=None):
# Value sharing is optional (but required in this example!).
# It allows for more efficient serialization of repeated structures and makes it possible
# to serialize cyclic structures (at the cost of some extra line overhead)
payload = cbor2.dumps([args, kwargs],
value_sharing=True,
default=default_encoder)
return EncodedPayload(payload, ENC_ALGO)
def encode(self, is_originating, uri, args=None, kwargs=None):
# Autobahn wants to send custom payload: convert to an instance
# of EncodedPayload
if self.with_timestamp:
kwargs['value'] = kwargs.pop('reading', -1.)
payload = json.dumps(kwargs).encode()
else:
payload = str(kwargs.get('reading', -1.)).encode()
return EncodedPayload(payload, u'mqtt')
def encode(self, is_originating, uri, args=None, kwargs=None):
# Autobahn wants to send custom payload: convert to an instance
# of EncodedPayload
payload = struct.pack(self.FORMAT, args[0])
return EncodedPayload(payload, u'mqtt')