django_json_response.py

try:
    import json
except ImportError:
    from django.utils import simplejson as json

from django.http import HttpResponse
from django.conf import settings
from django.core.serializers.json import DjangoJSONEncoder

JSON_CONTENT_TYPE = 'application/json; charset=%s' % (settings.DEFAULT_CHARSET, )
JSON_FALLBACK_CONTENT_TYPE = "text/plain; charset=%s" % (settings.DEFAULT_CHARSET, )


class JSONResponse(HttpResponse):
    """
    Response that will return JSON serialized value of the content.

    It accept request as first argument because it need set correct
    contenty type for older version of IE.

    """
    INDENT = 1 if settings.DEBUG else None

    def __init__(self, request, content, *args, **kwargs):

        accept = request.META.get('HTTP_ACCEPT', '*/*')
        if 'text/html' in accept and 'application/json' not in accept:
            content_type = JSON_FALLBACK_CONTENT_TYPE
        else:
            content_type = JSON_CONTENT_TYPE

        json_content = json.dumps(content, cls=DjangoJSONEncoder, indent=self.INDENT)

        super(JSONResponse, self).__init__(json_content, content_type, *args, **kwargs)