1 files changed, 47 insertions, 0 deletions
diff --git a/repoze/bfg/traversal.py b/repoze/bfg/traversal.py
new file mode 100644
index 000000000..1b9cfb332
--- /dev/null
+++ b/repoze/bfg/traversal.py
@@ -0,0 +1,47 @@
+import urllib
+
+from zope.interface import implements
+
+from repoze.bfg.interfaces import ITraversalPolicy
+from repoze.bfg.interfaces import ITraverser
+
+def split_path(path):
+    if path.startswith('/'):
+        path = path[1:]
+    if path.endswith('/'):
+        path = path[:-1]
+    clean=[]
+    for segment in path.split('/'):
+        segment = urllib.unquote(segment) # deal with spaces in path segment
+        if not segment or segment=='.':
+            continue
+        elif segment == '..':
+            del clean[-1]
+        else:
+            clean.append(segment)
+    return clean
+
+class NaiveTraversalPolicy:
+    implements(ITraversalPolicy)
+
+    def __call__(self, environ, root):
+        path = split_path(environ['PATH_INFO'])
+        
+        ob = root
+        name = ''
+
+        while path:
+            segment = pop(path)
+            traverser = ITraverser(ob)
+            next = traverser(environ, segment)
+            if next is None:
+                if path:
+                    name = pop(path)
+                break
+            ob = next
+
+        return ob, name, path
+
+def pop(path):
+    return path.pop(0)
+