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json_util.cpython-36.pyc
3 �}:ah= � @ s� d Z ddlZddlZddlZddlmZmZ ddlZddlm Z m Z m Z m Z ej e�ZG dd� d�ZG dd� dej�ZG d d � d e je jed �Zeed �d d�Zd dd�Zdd� Zd!dd�Zdd� Z dd� Z dd� Z d d � Z G d d � d e�Z dS )"z�JSON (de)serialization framework. The framework presented here is somewhat based on `Go's "json" package`_ (especially the ``omitempty`` functionality). .. _`Go's "json" package`: http://golang.org/pkg/encoding/json/ � N)�Dict�Type)�b64�errors� interfaces�utilc @ sr e Zd ZdZd Zd d d �Zed d � �Zd d� Zdd� Z dd� Z dd� Z dd� Z dd� Z edd� �Zedd � �ZdS ) �Fielda� JSON object field. :class:`Field` is meant to be used together with :class:`JSONObjectWithFields`. ``encoder`` (``decoder``) is a callable that accepts a single parameter, i.e. a value to be encoded (decoded), and returns the serialized (deserialized) value. In case of errors it should raise :class:`~josepy.errors.SerializationError` (:class:`~josepy.errors.DeserializationError`). Note, that ``decoder`` should perform partial serialization only. :ivar str json_name: Name of the field when encoded to JSON. :ivar default: Default value (used when not present in JSON object). :ivar bool omitempty: If ``True`` and the field value is empty, then it will not be included in the serialized JSON object, and ``default`` will be used for deserialization. Otherwise, if ``False``, field is considered as required, value will always be included in the serialized JSON objected, and it must also be present when deserializing. � json_name�default� omitempty�fdec�fencNFc C s> || _ || _|| _|d kr | jn|| _|d kr4| jn|| _d S )N)r r r �default_decoderr �default_encoderr )�selfr r r �decoder�encoder� r � /usr/lib/python3.6/json_util.py�__init__/ s zField.__init__c C s t |t� o| S )z�Is the provided value considered "empty" for this field? This is useful for subclasses that might want to override the definition of being empty, e.g. for some more exotic data types. )� isinstance�bool)�cls�valuer r r �_empty9 s z Field._emptyc C s | j |�o| jS )zOmit the value in output?)r r )r r r r r �omitC s z Field.omitc K s, | j | j| j| j| jd�|�}t| �f |�S )N)r r r r r )r r r r r �type)r �kwargsZcurrentr r r �_update_paramsG s zField._update_paramsc C s | j |d�S )z6Descriptor to change the decoder on JSON object field.)r )r )r r r r r r P s z Field.decoderc C s | j |d�S )z6Descriptor to change the encoder on JSON object field.)r )r )r r r r r r T s z Field.encoderc C s | j |�S )z4Decode a value, optionally with context JSON object.)r )r r r r r �decodeX s z Field.decodec C s | j |�S )z4Encode a value, optionally with context JSON object.)r )r r r r r �encode\ s z Field.encodec sN t |t�r t� fdd�|D ��S t |t�rFtj� fdd�|j� D ��S |S dS )z�Default decoder. Recursively deserialize into immutable types ( :class:`josepy.util.frozendict` instead of :func:`dict`, :func:`tuple` instead of :func:`list`). c 3 s | ]}� j |�V qd S )N)r )�.0Zsubvalue)r r r � <genexpr>k s z(Field.default_decoder.<locals>.<genexpr>c s" i | ]\}}� j |�� j |��qS r )r )r! �keyr )r r r � <dictcomp>n s z)Field.default_decoder.<locals>.<dictcomp>N)r �list�tuple�dictr Z frozendict�items)r r r )r r r ` s zField.default_decoderc C s |S )z Default (passthrough) encoder.r )r r r r r r s s zField.default_encoder)r r r r r )NFNN)�__name__� __module__� __qualname__�__doc__� __slots__r � classmethodr r r r r r r r r r r r r r s r c @ s* e Zd ZU dZi Zeeef dd� ZdS )�JSONObjectWithFieldsMetaa� Metaclass for :class:`JSONObjectWithFields` and its subclasses. It makes sure that, for any class ``cls`` with ``__metaclass__`` set to ``JSONObjectWithFieldsMeta``: 1. All fields (attributes of type :class:`Field`) in the class definition are moved to the ``cls._fields`` dictionary, where keys are field attribute names and values are fields themselves. 2. ``cls.__slots__`` is extended by all field attribute names (i.e. not :attr:`Field.json_name`). Original ``cls.__slots__`` are stored in ``cls._orig_slots``. In a consequence, for a field attribute name ``some_field``, ``cls.some_field`` will be a slot descriptor and not an instance of :class:`Field`. For example:: some_field = Field('someField', default=()) class Foo: __metaclass__ = JSONObjectWithFieldsMeta __slots__ = ('baz',) some_field = some_field assert Foo.__slots__ == ('some_field', 'baz') assert Foo._orig_slots == () assert Foo.some_field is not Field assert Foo._fields.keys() == ['some_field'] assert Foo._fields['some_field'] is some_field As an implementation note, this metaclass inherits from :class:`abc.ABCMeta` (and not the usual :class:`type`) to mitigate the metaclass conflict (:class:`ImmutableMap` and :class:`JSONDeSerializable`, parents of :class:`JSONObjectWithFields`, use :class:`abc.ABCMeta` as its metaclass). c C s� i }x |D ]}|j t|di �� q W x0t|j� �D ] \}}t|t�r2|j|�||< q2W |jdf �|d< tt|d �t|j � � �|d< ||d< t j j | |||�S )N�_fieldsr- Z _orig_slots) �update�getattrr& r( r r �pop�getr% �keys�abc�ABCMeta�__new__)Zmcs�name�basesZdikt�fields�baser# r r r r r8 � s z JSONObjectWithFieldsMeta.__new__N) r) r* r+ r, r0 r �strr r8 r r r r r/ { s &r/ c sn e Zd ZdZeed�dd��Z� fdd�Zdd� Zd d � Z d d � Z ed d� �Z edd� �Z edd� �Z � ZS )�JSONObjectWithFieldsa� JSON object with fields. Example:: class Foo(JSONObjectWithFields): bar = Field('Bar') empty = Field('Empty', omitempty=True) @bar.encoder def bar(value): return value + 'bar' @bar.decoder def bar(value): if not value.endswith('bar'): raise errors.DeserializationError('No bar suffix!') return value[:-3] assert Foo(bar='baz').to_partial_json() == {'Bar': 'bazbar'} assert Foo.from_json({'Bar': 'bazbar'}) == Foo(bar='baz') assert (Foo.from_json({'Bar': 'bazbar', 'Empty': '!'}) == Foo(bar='baz', empty='!')) assert Foo(bar='baz').bar == 'baz' )�returnc C s dd� | j j� D �S )zGet default fields values.c S s i | ]\}}|j |�qS r )r )r! �slot�fieldr r r r$ � s z2JSONObjectWithFields._defaults.<locals>.<dictcomp>)r0 r( )r r r r � _defaults� s z JSONObjectWithFields._defaultsc s t � jf | j� |�� d S )N)�superr rB )r r )� __class__r r r � s z JSONObjectWithFields.__init__c C sD y| j | }W n$ tk r2 tjdj|���Y nX |jt| |��S )z�Encode a single field. :param str name: Name of the field to be encoded. :raises errors.SerializationError: if field cannot be serialized :raises errors.Error: if field could not be found zField not found: {0})r0 �KeyErrorr �Error�formatr r2 )r r9 rA r r r r � s zJSONObjectWithFields.encodec C s� i }t � }x�| jj� D ]z\}}t| |�}|j|�rB|j||f� qy|j|�||j< W q tj k r� } ztj dj |||���W Y dd}~X qX qW |S )zSerialize fields to JSON.z Could not encode {0} ({1}): {2}N) �setr0 r( r2 r �addr r r ZSerializationErrorrG )r �jobjZomittedr@ rA r �errorr r r �fields_to_partial_json� s "z+JSONObjectWithFields.fields_to_partial_jsonc C s | j � S )N)rL )r r r r �to_partial_json s z$JSONObjectWithFields.to_partial_jsonc C sZ t � }x4| jj� D ]&\}}|j r|j|kr|j|j� qW |rVtjdjdj |����d S )Nz&The following fields are required: {0}�,) rH r0 r( r r rI r �DeserializationErrorrG �join)r rJ Zmissing�_rA r r r �_check_required s z$JSONObjectWithFields._check_requiredc C s� | j |� i }x�| jj� D ]z\}}|j|kr>|jr>|j||< q||j }y|j|�||< W q tjk r� } ztjdj |||���W Y dd}~X qX qW |S )z Deserialize fields from JSON.z#Could not decode {0!r} ({1!r}): {2}N) rR r0 r( r r r r r rO rG )r rJ r; r@ rA r rK r r r �fields_from_json s "z%JSONObjectWithFields.fields_from_jsonc C s | f | j |��S )N)rS )r rJ r r r � from_json& s z JSONObjectWithFields.from_json)r) r* r+ r, r. r rB r r rL rM rR rS rT � __classcell__r r )rD r r> � s r> )� metaclass)�datar? c C s t j| �jd�S )zJEncode JOSE Base-64 field. :param bytes data: :rtype: `str` �ascii)r Z b64encoder )rW r r r �encode_b64jose+ s rY Fc C s� yt j| j� �}W n. tjk r@ } ztj|��W Y dd}~X nX |dk r|| r\t|�|ksl|r|t|�|k r|tjdj|���|S )a Decode JOSE Base-64 field. :param unicode data: :param int size: Required length (after decoding). :param bool minimum: If ``True``, then `size` will be treated as minimum required length, as opposed to exact equality. :rtype: bytes Nz&Expected at least or exactly {0} bytes) r Z b64decoder �binasciirF r rO �lenrG )rW �size�minimumZdecodedrK r r r �decode_b64jose6 s r^ c C s t j| �j� S )z;Hexlify. :param bytes value: :rtype: unicode )rZ Zhexlifyr )r r r r � encode_hex16N s r_ c C s� | j � } |dk rB| r&t| �|d ks:|rBt| �|d k rBtj� �y tj| �S tjk rz } ztj|��W Y dd}~X nX dS )a Decode hexlified field. :param unicode value: :param int size: Required length (after decoding). :param bool minimum: If ``True``, then `size` will be treated as minimum required length, as opposed to exact equality. :rtype: bytes N� )r r[ r rO rZ Z unhexlifyrF )r r\ r] rK r r r � decode_hex16X s ra c C s t tjjtjj| j��S )z�Encode certificate as JOSE Base-64 DER. :type cert: `OpenSSL.crypto.X509` wrapped in `.ComparableX509` :rtype: unicode )rY �OpenSSL�cryptoZdump_certificate� FILETYPE_ASN1�wrapped)Zcertr r r � encode_certm s rf c C sR y t jtjjtjjt| ���S tjjk rL } ztj |��W Y dd}~X nX dS )z�Decode JOSE Base-64 DER-encoded certificate. :param unicode b64der: :rtype: `OpenSSL.crypto.X509` wrapped in `.ComparableX509` N) r �ComparableX509rb rc Zload_certificaterd r^ rF r rO )�b64derrK r r r � decode_certx s ri c C s t tjjtjj| j��S )zEncode CSR as JOSE Base-64 DER. :type csr: `OpenSSL.crypto.X509Req` wrapped in `.ComparableX509` :rtype: unicode )rY rb rc Zdump_certificate_requestrd re )Zcsrr r r � encode_csr� s rj c C sR y t jtjjtjjt| ���S tjjk rL } ztj |��W Y dd}~X nX dS )z�Decode JOSE Base-64 DER-encoded CSR. :param unicode b64der: :rtype: `OpenSSL.crypto.X509Req` wrapped in `.ComparableX509` N) r rg rb rc Zload_certificate_requestrd r^ rF r rO )rh rK r r r � decode_csr� s rk c @ s` e Zd ZU dZeZedZeeZe ee f e d dd��Z e dd� �Z dd � Ze d d � �ZdS ) �TypedJSONObjectWithFieldszJSON object with type.r Nc C s |dkr|j n|}|| j|< |S )z(Register class for JSON deserialization.N)�typ�TYPES)r �type_clsrm r r r �register� s z"TypedJSONObjectWithFields.registerc C s� | | j j� kr.| j|kr*tjdj| j���| S t|t�sHtjdj|���y|| j }W n tk rt tjd��Y nX y | j | S tk r� tj ||��Y nX dS )z&Get the registered class for ``jobj``.zMissing type field ({0})z {0} is not a dictionary objectzmissing type fieldN) rn �values�type_field_namer rO rG r r' rE ZUnrecognizedTypeError)r rJ rm r r r � get_type_cls� s z&TypedJSONObjectWithFields.get_type_clsc C s | j � }| j|| j< |S )a Get JSON serializable object. :returns: Serializable JSON object representing ACME typed object. :meth:`validate` will almost certainly not work, due to reasons explained in :class:`josepy.interfaces.IJSONSerializable`. :rtype: dict )rL rm rr )r rJ r r r rM � s z)TypedJSONObjectWithFields.to_partial_jsonc C s | j |�}|f |j|��S )z�Deserialize ACME object from valid JSON object. :raises josepy.errors.UnrecognizedTypeError: if type of the ACME object has not been registered. )rs rS )r rJ ro r r r rT � s z#TypedJSONObjectWithFields.from_json)N)r) r* r+ r, �NotImplementedrm r= rr rn r r r. rp rs rM rT r r r r rl � s rl )NF)NF)!r, r6 rZ ZloggingZtypingr r rb Zjosepyr r r r Z getLoggerr) Zloggerr r7 r/ Z ImmutableMapZJSONDeSerializabler> �bytesr= rY r^ r_ ra rf ri rj rk rl r r r r �<module> s* f>p