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interfaces.cpython-310.pyc
o h9Ra @ sV d Z ddlZddlZddlmZ ddlmZ ddlmZm Z G dd de ej dZ dS ) zJOSE interfaces. NAny)errors)SequenceMappingc @ s e Zd ZdZejdefddZdefddZe ejdedd fdd Z e d e dd fd d Z d ede fddZ de fddZe dd defddZdS )JSONDeSerializablea Interface for (de)serializable JSON objects. Please recall, that standard Python library implements :class:`json.JSONEncoder` and :class:`json.JSONDecoder` that perform translations based on respective :ref:`conversion tables <conversion-table>` that look pretty much like the one below (for complete tables see relevant Python documentation): .. _conversion-table: ====== ====== JSON Python ====== ====== object dict ... ... ====== ====== While the above **conversion table** is about translation of JSON documents to/from the basic Python types only, :class:`JSONDeSerializable` introduces the following two concepts: serialization Turning an arbitrary Python object into Python object that can be encoded into a JSON document. **Full serialization** produces a Python object composed of only basic types as required by the :ref:`conversion table <conversion-table>`. **Partial serialization** (accomplished by :meth:`to_partial_json`) produces a Python object that might also be built from other :class:`JSONDeSerializable` objects. deserialization Turning a decoded Python object (necessarily one of the basic types as required by the :ref:`conversion table <conversion-table>`) into an arbitrary Python object. Serialization produces **serialized object** ("partially serialized object" or "fully serialized object" for partial and full serialization respectively) and deserialization produces **deserialized object**, both usually denoted in the source code as ``jobj``. Wording in the official Python documentation might be confusing after reading the above, but in the light of those definitions, one can view :meth:`json.JSONDecoder.decode` as decoder and deserializer of basic types, :meth:`json.JSONEncoder.default` as serializer of basic types, :meth:`json.JSONEncoder.encode` as serializer and encoder of basic types. One could extend :mod:`json` to support arbitrary object (de)serialization either by: - overriding :meth:`json.JSONDecoder.decode` and :meth:`json.JSONEncoder.default` in subclasses - or passing ``object_hook`` argument (or ``object_hook_pairs``) to :func:`json.load`/:func:`json.loads` or ``default`` argument for :func:`json.dump`/:func:`json.dumps`. Interestingly, ``default`` is required to perform only partial serialization, as :func:`json.dumps` applies ``default`` recursively. This is the idea behind making :meth:`to_partial_json` produce only partial serialization, while providing custom :meth:`json_dumps` that dumps with ``default`` set to :meth:`json_dump_default`. To make further documentation a bit more concrete, please, consider the following imaginatory implementation example:: class Foo(JSONDeSerializable): def to_partial_json(self): return 'foo' @classmethod def from_json(cls, jobj): return Foo() class Bar(JSONDeSerializable): def to_partial_json(self): return [Foo(), Foo()] @classmethod def from_json(cls, jobj): return Bar() returnc C s t )a Partially serialize. Following the example, **partial serialization** means the following:: assert isinstance(Bar().to_partial_json()[0], Foo) assert isinstance(Bar().to_partial_json()[1], Foo) # in particular... assert Bar().to_partial_json() != ['foo', 'foo'] :raises josepy.errors.SerializationError: in case of any serialization error. :returns: Partially serializable object. )NotImplementedErrorself r 3/usr/lib/python3/dist-packages/josepy/interfaces.pyto_partial_jsonf z"JSONDeSerializable.to_partial_jsonc s dt dt f fdd | S )aD Fully serialize. Again, following the example from before, **full serialization** means the following:: assert Bar().to_json() == ['foo', 'foo'] :raises josepy.errors.SerializationError: in case of any serialization error. :returns: Fully serialized object. objr c s t | tr | S t | tr| S t | tr fdd| D S t | tr0t fdd| D S t | tr@ fdd| D S | S )Nc s g | ]} |qS r r .0subobj _serializer r <listcomp> s zBJSONDeSerializable.to_json.<locals>._serialize.<locals>.<listcomp>c 3 s | ]} |V qd S )Nr r r r r <genexpr> s zAJSONDeSerializable.to_json.<locals>._serialize.<locals>.<genexpr>c s i | ] \}} | |qS r r )r keyvaluer r r <dictcomp> s zBJSONDeSerializable.to_json.<locals>._serialize.<locals>.<dictcomp>) isinstancer r strlistr tupler items)r r r r r s z.JSONDeSerializable.to_json.<locals>._serializer r r r r to_jsony s zJSONDeSerializable.to_jsonjobjc C s | S )a Deserialize a decoded JSON document. :param jobj: Python object, composed of only other basic data types, as decoded from JSON document. Not necessarily :class:`dict` (as decoded from "JSON object" document). :raises josepy.errors.DeserializationError: if decoding was unsuccessful, e.g. in case of unparseable X509 certificate, or wrong padding in JOSE base64 encoded string, etc. r )clsr! r r r from_json r z JSONDeSerializable.from_json json_stringc C s< zt |}W n ty } zt|d}~ww | |S )z&Deserialize from JSON document string.N)jsonloads ValueErrorr DeserializationErrorr# )r" r$ r& errorr r r json_loads s z JSONDeSerializable.json_loadskwargsc K s t j| fd| ji|S )zsDump to JSON string using proper serializer. :returns: JSON document string. :rtype: str default)r% dumpsjson_dump_default)r r+ r r r json_dumps s z JSONDeSerializable.json_dumpsc C s | j ddddS )zNDump the object to pretty JSON document string. :rtype: str T ),z: ) sort_keysindent separators)r/ r r r r json_dumps_pretty s z$JSONDeSerializable.json_dumps_pretty python_objectc C s" t |tr | S tt|d )a Serialize Python object. This function is meant to be passed as ``default`` to :func:`json.dump` or :func:`json.dumps`. They call ``default(python_object)`` only for non-basic Python types, so this function necessarily raises :class:`TypeError` if ``python_object`` is not an instance of :class:`IJSONSerializable`. Please read the class docstring for more information. z is not JSON serializable)r r r TypeErrorrepr)r" r6 r r r r. s z$JSONDeSerializable.json_dump_defaultN)__name__ __module__ __qualname____doc__abcabstractmethodr r r classmethodr# r r* r/ r5 r. r r r r r s V r ) metaclass) r< r= r% typingr josepyr collections.abcr r objectABCMetar r r r r <module> s