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from __future__ import absolute_import
import types
import warnings
from django.conf import settings
from django.core.serializers.json import DjangoJSONEncoder
from django.db.models.query import QuerySet
from django.http import HttpResponse
# Find a JSON module to use
try: #pragma: no cover
import json
except ImportError: #pragma: no cover
try:
import simplejson as json
except ImportError:
from django.utils import simplejson as json
def maybe_call(x):
if callable(x):
return x()
return x
class JSONEncoder(DjangoJSONEncoder):
"""Custom encoder to allow arbitrary model classes."""
def default(self, obj):
if hasattr(obj, 'to_dict'):
return maybe_call(obj.to_dict)
elif hasattr(obj, 'to_list'):
return maybe_call(obj.to_list)
elif isinstance(obj, (QuerySet, types.GeneratorType)):
return list(obj)
return super(JSONEncoder, self).default(obj)
load = json.load
loads = json.loads
dump = lambda obj: json.dump(obj, cls=JSONEncoder)
dumps = lambda obj: json.dumps(obj, cls=JSONEncoder)
class JSONResponse(HttpResponse):
"""JSON response wrapper."""
def __init__(self, obj={}, *args, **kwargs):
kwargs.setdefault('mimetype', 'application/json')
if not isinstance(obj, dict):
# Returning anything other than an object literal is a possible
# security issue. http://flask.pocoo.org/docs/security/#json-security
msg = 'Only dicts should be used with JSONResponse for security reasons.'
if settings.DEBUG:
raise ValueError(msg)
else:
warnings.warn(msg)
super(JSONResponse, self).__init__(dumps(obj), *args, **kwargs)