def deserialize_content(self, data: bytes, key: SymmetricKey,
msg: SecureMessage) -> Optional[Content]:
dictionary = json_decode(data=data)
# TODO: translate short keys
# 'T' -> 'type'
# 'N' -> 'sn'
# 'G' -> 'group'
content = Content.parse(content=dictionary)
assert content is not None, 'content error: %d' % len(data)
if not is_broadcast(msg=msg):
# check and cache key for reuse
group = self.overt_group(content=content)
if group is None:
# personal message or (group) command
# cache key with direction (sender -> receiver)
self.cache_cipher_key(key=key,
sender=msg.sender,
receiver=msg.receiver)
else:
# group message (excludes group command)
# cache the key with direction (sender -> group)
self.cache_cipher_key(key=key,
sender=msg.sender,
receiver=group)
# NOTICE: check attachment for File/Image/Audio/Video message content
# after deserialize content, this job should be do in subclass
return content
def deserialize_message(self, data: bytes) -> Optional[ReliableMessage]:
dictionary = json_decode(data=data)
# TODO: translate short keys
# 'S' -> 'sender'
# 'R' -> 'receiver'
# 'W' -> 'time'
# 'T' -> 'type'
# 'G' -> 'group'
# ------------------
# 'D' -> 'data'
# 'V' -> 'signature'
# 'K' -> 'key'
# ------------------
# 'M' -> 'meta'
return ReliableMessage.parse(msg=dictionary)
def deserialize_key(self, data: Optional[bytes], sender: ID, receiver: ID,
msg: SecureMessage) -> Optional[SymmetricKey]:
if data is None:
# get key from cache
return self.key_cache.cipher_key(sender=sender, receiver=receiver)
else:
assert not is_broadcast(msg=msg), 'broadcast message has no key: %s' % msg
dictionary = json_decode(data=data)
# TODO: translate short keys
# 'A' -> 'algorithm'
# 'D' -> 'data'
# 'V' -> 'iv'
# 'M' -> 'mode'
# 'P' -> 'padding'
return SymmetricKey.parse(key=dictionary)