mirror of
https://github.com/encode/django-rest-framework.git
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89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
"""
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Helper classes for parsers.
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"""
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import contextlib
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import datetime
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import decimal
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import ipaddress
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import json # noqa
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import uuid
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from django.db.models.query import QuerySet
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from django.utils import timezone
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from django.utils.encoding import force_str
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from django.utils.functional import Promise
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from rest_framework.compat import coreapi
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class JSONEncoder(json.JSONEncoder):
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"""
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JSONEncoder subclass that knows how to encode date/time/timedelta,
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decimal types, generators and other basic python objects.
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"""
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def default(self, obj):
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# For Date Time string spec, see ECMA 262
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# https://ecma-international.org/ecma-262/5.1/#sec-15.9.1.15
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if isinstance(obj, Promise):
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return force_str(obj)
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elif isinstance(obj, datetime.datetime):
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representation = obj.isoformat()
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if representation.endswith('+00:00'):
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representation = representation[:-6] + 'Z'
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return representation
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elif isinstance(obj, datetime.date):
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return obj.isoformat()
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elif isinstance(obj, datetime.time):
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if timezone and timezone.is_aware(obj):
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raise ValueError("JSON can't represent timezone-aware times.")
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representation = obj.isoformat()
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return representation
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elif isinstance(obj, datetime.timedelta):
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return str(obj.total_seconds())
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elif isinstance(obj, decimal.Decimal):
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# Serializers will coerce decimals to strings by default.
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return float(obj)
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elif isinstance(obj, uuid.UUID):
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return str(obj)
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elif isinstance(obj, (
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ipaddress.IPv4Address,
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ipaddress.IPv6Address,
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ipaddress.IPv4Network,
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ipaddress.IPv6Network,
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ipaddress.IPv4Interface,
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ipaddress.IPv6Interface)
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):
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return str(obj)
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elif isinstance(obj, QuerySet):
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return tuple(obj)
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elif isinstance(obj, bytes):
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# Best-effort for binary blobs. See #4187.
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return obj.decode()
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elif hasattr(obj, 'tolist'):
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# Numpy arrays and array scalars.
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return obj.tolist()
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elif (coreapi is not None) and isinstance(obj, (coreapi.Document, coreapi.Error)):
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raise RuntimeError(
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'Cannot return a coreapi object from a JSON view. '
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'You should be using a schema renderer instead for this view.'
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)
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elif hasattr(obj, '__getitem__'):
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cls = (list if isinstance(obj, (list, tuple)) else dict)
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with contextlib.suppress(Exception):
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return cls(obj)
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elif hasattr(obj, '__iter__'):
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return tuple(item for item in obj)
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return super().default(obj)
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class CustomScalar:
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"""
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CustomScalar that knows how to encode timedelta that renderer
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can understand.
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"""
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@classmethod
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def represent_timedelta(cls, dumper, data):
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value = str(data.total_seconds())
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return dumper.represent_scalar('tag:yaml.org,2002:str', value)
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