human
Complete the below
def ajax(authenticated=True, data_required=False, json_encoder=json.JSONEncoder):

    ''''Decorator to allow the wrappered view to exist in an AJAX environment.
    Provide a decorator to wrap a view method so that it may exist in an
    entirely AJAX environment:
    - data decoded from JSON as input and data coded as JSON as output
    - result status is coded in the HTTP status code.
any non-2xx response
    data will be coded as a JSON string, otherwise the response type (always
    JSON) is specific to the method called.
    if authenticated is true then we\'ll make sure the current user is
    authenticated.
    If data_required is true then we\'ll assert that there is a JSON body
    present.
    The wrapped view method should return either:
    - JSON serialisable data
    - an object of the django http.HttpResponse subclass (one of JSONResponse
    or CreatedResponse is suggested)
    - nothing
    Methods returning nothing (or None explicitly) will result in a 204 "NO
    CONTENT" being returned to the caller.'
    '''
assistant
#Here is the Python code you requested.
    def decorator(function, authenticated=authenticated, data_required=data_required):
        @functools.wraps(function, assigned=decorators.available_attrs(function))
        def _wrapped(self, request, *args, **kw):
            if (authenticated and (not request.user.is_authenticated())):
                return JSONResponse('not    logged    in', 401)
            if (not request.is_ajax()):
                return JSONResponse('request    must    be    AJAX', 400)
            request.DATA = None
            if request.body:
                try:
                    request.DATA = json.loads(request.body)
                except (TypeError, ValueError) as e:
                    return JSONResponse(('malformed    JSON    request:    %s' % e), 400)
            if data_required:
                if (not request.DATA):
                    return JSONResponse('request    requires    JSON    body', 400)
            try:
                data = function(self, request, *args, **kw)
                if isinstance(data, http.HttpResponse):
                    return data
                elif (data is None):
                    return JSONResponse('', status=204)
                return JSONResponse(data, json_encoder=json_encoder)
            except http_errors as e:
                for attr in ['http_status', 'code', 'status_code']:
                    if hasattr(e, attr):
                        http_status = getattr(e, attr)
                        break
                else:
                    LOG.exception('HTTP    exception    with    no    status/code')
                    return JSONResponse(str(e), 500)
                return JSONResponse(str(e), http_status)
            except Exception as e:
                LOG.exception('error    invoking    apiclient')
                return JSONResponse(str(e), 500)
        return _wrapped
    return decorator