mirror of
https://github.com/theupdateframework/python-tuf
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54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
# Copyright New York University and the TUF contributors
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# SPDX-License-Identifier: MIT OR Apache-2.0
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"""TUF role metadata de/serialization.
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This sub-package provides abstract base classes and concrete implementations to
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serialize and deserialize TUF role metadata and metadata parts.
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Any custom de/serialization implementations should inherit from the abstract
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base classes defined in this __init__.py module.
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- Metadata de/serializers are used to convert to and from wireline formats.
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- Signed serializers are used to canonicalize data for cryptographic signatures
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generation and verification.
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"""
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import abc
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# TODO: Should these be in tuf.exceptions or inherit from tuf.exceptions.Error?
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class SerializationError(Exception):
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"""Error during serialization. """
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class DeserializationError(Exception):
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"""Error during deserialization. """
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class MetadataDeserializer():
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"""Abstract base class for deserialization of Metadata objects. """
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def deserialize(self, raw_data: bytes) -> "Metadata":
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"""Deserialize passed bytes to Metadata object. """
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raise NotImplementedError
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class MetadataSerializer():
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"""Abstract base class for serialization of Metadata objects. """
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def serialize(self, metadata_obj: "Metadata") -> bytes:
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"""Serialize passed Metadata object to bytes. """
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raise NotImplementedError
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class SignedSerializer():
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"""Abstract base class for serialization of Signed objects. """
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def serialize(self, signed_obj: "Signed") -> bytes:
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"""Serialize passed Signed object to bytes. """
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raise NotImplementedError
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