--- /dev/null
+from django import http
+from django.utils import simplejson as json
+from django.utils.functional import Promise
+from datetime import datetime
+from functools import wraps
+
+
+class ExtendedEncoder(json.JSONEncoder):
+
+ def default(self, obj):
+ if isinstance(obj, Promise):
+ return unicode(obj)
+
+ if isinstance(obj, datetime):
+ return datetime.ctime(obj) + " " + (datetime.tzname(obj) or 'GMT')
+
+ return json.JSONEncoder.default(self, obj)
+
+
+# shortcut for JSON reponses
+class JSONResponse(http.HttpResponse):
+
+ def __init__(self, data={}, **kwargs):
+ # get rid of mimetype
+ kwargs.pop('mimetype', None)
+
+ data = json.dumps(data, cls=ExtendedEncoder)
+ super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
+
+
+# return errors
+class JSONFormInvalid(JSONResponse):
+ def __init__(self, form):
+ super(JSONFormInvalid, self).__init__(form.errors, status=400)
+
+
+class JSONServerError(JSONResponse):
+ def __init__(self, *args, **kwargs):
+ kwargs['status'] = 500
+ super(JSONServerError, self).__init__(*args, **kwargs)
+
+
+def ajax_login_required(view):
+ @wraps(view)
+ def authenticated_view(request, *args, **kwargs):
+ if not request.user.is_authenticated():
+ return http.HttpResponse("Login required.", status=401, mimetype="text/plain")
+ return view(request, *args, **kwargs)
+ return authenticated_view
+
+
+def ajax_require_permission(permission):
+ def decorator(view):
+ @wraps(view)
+ def authorized_view(request, *args, **kwargs):
+ if not request.user.has_perm(permission):
+ return http.HttpResponse("Access Forbidden.", status=403, mimetype="text/plain")
+ return view(request, *args, **kwargs)
+ return authorized_view
+ return decorator
+
+import collections
+
+def recursive_groupby(iterable):
+ """
+# >>> recursive_groupby([1,2,3,4,5])
+# [1, 2, 3, 4, 5]
+
+ >>> recursive_groupby([[1]])
+ [1]
+
+ >>> recursive_groupby([('a', 1),('a', 2), 3, ('b', 4), 5])
+ ['a', [1, 2], 3, 'b', [4], 5]
+
+ >>> recursive_groupby([('a', 'x', 1),('a', 'x', 2), ('a', 'x', 3)])
+ ['a', ['x', [1, 2, 3]]]
+
+ """
+
+ def _generator(iterator):
+ group = None
+ grouper = None
+
+ for item in iterator:
+ if not isinstance(item, collections.Sequence):
+ if grouper is not None:
+ yield grouper
+ if len(group):
+ yield recursive_groupby(group)
+ group = None
+ grouper = None
+ yield item
+ continue
+ elif len(item) == 1:
+ if grouper is not None:
+ yield grouper
+ if len(group):
+ yield recursive_groupby(group)
+ group = None
+ grouper = None
+ yield item[0]
+ continue
+ elif not len(item):
+ continue
+
+ if grouper is None:
+ group = [item[1:]]
+ grouper = item[0]
+ continue
+
+ if grouper != item[0]:
+ if grouper is not None:
+ yield grouper
+ if len(group):
+ yield recursive_groupby(group)
+ group = None
+ grouper = None
+ group = [item[1:]]
+ grouper = item[0]
+ continue
+
+ group.append(item[1:])
+
+ if grouper is not None:
+ yield grouper
+ if len(group):
+ yield recursive_groupby(group)
+ group = None
+ grouper = None
+
+ return list(_generator(iterable))