-def stringify_keys(dictionary):
- return dict((keyword.encode('ascii'), value)
- for keyword, value in dictionary.items())
-
-
-def json_encode(obj, sort_keys=True, ensure_ascii=False):
- return json.dumps(obj, sort_keys=sort_keys, ensure_ascii=ensure_ascii)
-
-
-def json_decode(obj):
- return json.loads(obj)
-
-
-def json_decode_fallback(value):
- try:
- return json_decode(value)
- except ValueError:
- return value
-
-
-class AjaxError(Exception):
- pass
-
-
-def ajax(login_required=False, method=None, template=None, permission_required=None):
- def decorator(fun):
- @wraps(fun)
- def ajax_view(request):
- kwargs = {}
- request_params = None
- if method == 'post':
- request_params = request.POST
- elif method == 'get':
- request_params = request.GET
- fun_params, xx, fun_kwargs, defaults = getargspec(fun)
- if defaults:
- required_params = fun_params[1:-len(defaults)]
- else:
- required_params = fun_params[1:]
- missing_params = set(required_params) - set(request_params)
- if missing_params:
- res = {
- 'result': 'missing params',
- 'missing': ', '.join(missing_params),
- }
- else:
- if request_params:
- request_params = dict(
- (key, json_decode_fallback(value))
- for key, value in request_params.items()
- if fun_kwargs or key in fun_params)
- kwargs.update(stringify_keys(request_params))
- res = None
- if login_required and not request.user.is_authenticated:
- res = {'result': 'logout'}
- if (permission_required and
- not request.user.has_perm(permission_required)):
- res = {'result': 'access denied'}
- if not res:
- try:
- res = fun(request, **kwargs)
- if res and template:
- res = {'html': render_to_string(template, res, request=request)}
- except AjaxError as e:
- res = {'result': e.args[0]}
- if 'result' not in res:
- res['result'] = 'ok'
- return HttpResponse(json_encode(res), content_type='application/json; charset=utf-8',
- status=200 if res['result'] == 'ok' else 400)
-
- return ajax_view
-
- return decorator
-
-