Corrected node_view redirection of trailing slashes to non-trailing slashes to rely...
[philo.git] / middleware.py
1 from django.conf import settings
2 from django.contrib.sites.models import Site
3 from django.http import Http404
4 from philo.models import Node, View
5
6
7 class LazyNode(object):
8         def __get__(self, request, obj_type=None):
9                 if not hasattr(request, '_cached_node_path'):
10                         return None
11                 
12                 if not hasattr(request, '_found_node'):
13                         try:
14                                 current_site = Site.objects.get_current()
15                         except Site.DoesNotExist:
16                                 current_site = None
17                         
18                         path = request._cached_node_path
19                         trailing_slash = False
20                         if path[-1] == '/':
21                                 trailing_slash = True
22                         
23                         try:
24                                 node, subpath = Node.objects.get_with_path(path, root=getattr(current_site, 'root_node', None), absolute_result=False)
25                         except Node.DoesNotExist:
26                                 node = None
27                         else:
28                                 if subpath and not node.handles_subpath(subpath):
29                                         node = None
30                         
31                         if node:
32                                 if subpath is None:
33                                         subpath = ""
34                                 subpath = "/" + subpath
35                                 
36                                 if trailing_slash and subpath[-1] != "/":
37                                         subpath += "/"
38                                 
39                                 node.subpath = subpath
40                         
41                         request._found_node = node
42                 
43                 return request._found_node
44
45
46 class RequestNodeMiddleware(object):
47         """Middleware to process the request's path and attach the closest ancestor node."""
48         def process_request(self, request):
49                 request.__class__.node = LazyNode()
50         
51         def process_view(self, request, view_func, view_args, view_kwargs):
52                 try:
53                         request._cached_node_path = view_kwargs['path']
54                 except KeyError:
55                         pass
56         
57         def process_exception(self, request, exception):
58                 if settings.DEBUG or not hasattr(request, 'node') or not request.node:
59                         return
60                 
61                 if isinstance(exception, Http404):
62                         error_view = request.node.attributes.get('Http404', None)
63                 else:
64                         error_view = request.node.attributes.get('Http500', None)
65                 
66                 if error_view is None or not isinstance(error_view, View):
67                         # Should this be duck-typing? Perhaps even no testing?
68                         return
69                 
70                 extra_context = {'exception': exception}
71                 return error_view.render_to_response(request, extra_context)