Initial node_middleware commit. Implements an attribute on the HttpRequest class...

[philo.git] / middleware.py

diff --git a/middleware.py b/middleware.py
new file mode 100644 (file)
index 0000000..8c208e4
--- /dev/null
+++ b/middleware.py
@@ -0,0 +1,35 @@
+from django.contrib.sites.models import Site
+from philo.models import Node
+
+
+class LazyNode(object):
+       def __get__(self, request, obj_type=None):
+               if not hasattr(request, '_cached_node_path'):
+                       return None
+               
+               if not hasattr(request, '_found_node'):
+                       try:
+                               current_site = Site.objects.get_current()
+                       except Site.DoesNotExist:
+                               current_site = None
+                       
+                       try:
+                               node, subpath = Node.objects.get_with_path(request._cached_node_path, root=getattr(current_site, 'root_node', None), absolute_result=False)
+                       except Node.DoesNotExist:
+                               node = None
+                       
+                       if node:
+                               node.subpath = subpath
+                       
+                       request._found_node = node
+               
+               return request._found_node
+
+
+class RequestNodeMiddleware(object):
+       """Middleware to process the request's path and attach the closest ancestor node."""
+       def process_request(self, request):
+               request.__class__.node = LazyNode()
+       
+       def process_view(self, request, view_func, view_args, view_kwargs):
+               request._cached_node_path = view_kwargs.get('path', '/')
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