raise exception when kasten loads invalid packed bytes

This commit is contained in:
Kevin Froman 2020-12-24 05:00:36 +00:00
parent 903e203c63
commit 67be9077ab
2 changed files with 22 additions and 4 deletions

View File

@ -14,3 +14,7 @@ class InvalidID(KastenException):
"""Occurs when a Kasten generator fails validation, which means data does not match KastenChecksum"""
pass
class InvalidPackedBytes(KastenException):
"""Occurs when packed bytes cannot be deserialized"""
pass

View File

@ -1,9 +1,13 @@
"""Main Kasten object, does nothing but provide access to packed Kasten bytes and call a specified generator function"""
import traceback
from msgpack import unpackb
import msgpack
from .types import KastenChecksum
from .types import KastenPacked
from .generator import pack
from .exceptions import InvalidPackedBytes
"""
Copyright (C) <2020> Kevin Froman
@ -31,10 +35,20 @@ class Kasten:
**additional_generator_kwargs): # noqa
self.id = id
self.generator = generator
try:
header, data = packed_bytes.split(b'\n', 1)
except ValueError:
raise InvalidPackedBytes("Could not extract data section")
try:
header = unpackb(
header,
strict_map_key=True)
except( # noqa
msgpack.exceptions.ExtraData,
msgpack.FormatError,
UnicodeEncodeError,
ValueError) as _:
raise InvalidPackedBytes("Could not decode packed bytes")
self.header = header
self.data = data
self.additional_generator_args = list(additional_generator_args)