def data(self) -> Optional[bytes]:
if self.__attachment is None:
base64 = self.get('data')
if base64 is not None:
self.__attachment = base64_decode(base64)
return self.__attachment
def snapshot(self) -> Optional[bytes]:
if self.__snapshot is None:
base64 = self.get('snapshot')
if base64 is not None:
self.__snapshot = base64_decode(base64)
return self.__snapshot
def thumbnail(self) -> Optional[bytes]:
if self.__thumbnail is None:
base64 = self.get('thumbnail')
if base64 is not None:
self.__thumbnail = base64_decode(base64)
return self.__thumbnail
def decode_signature(self, signature: str,
msg: ReliableMessage) -> Optional[bytes]:
return base64_decode(string=signature)
def decode_data(self, data: str, msg: SecureMessage) -> Optional[bytes]:
if is_broadcast(msg=msg):
# broadcast message content will not be encrypted (just encoded to JsON),
# so return the string data directly
return utf8_encode(string=data)
return base64_decode(string=data)
def decode_key(self, key: str, msg: SecureMessage) -> Optional[bytes]:
assert not is_broadcast(msg=msg), 'broadcast message has no key'
return base64_decode(string=key)