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