--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/taginthemiddle/middleware.py	Tue May 04 08:37:15 2010 -0700
@@ -0,0 +1,86 @@
+"""
+request dispatcher:
+data persisting across requests should go here
+"""
+
+import os
+
+from handlers import Index
+from model import Tags
+
+from genshi.template import TemplateLoader
+from lxmlmiddleware import LXMLMiddleware
+from paste.fileapp import FileApp
+from pkg_resources import resource_filename
+from webob import Request, Response, exc
+
+# tags have:
+# - a list of resources they're applied to
+# for now just assume  auth is on and that anyone authenticated may tag
+
+# e.g. a tags file
+# foo = /bar /fleem/baz etc
+# cats = /cats /blog/mycat
+
+class Tagger(LXMLMiddleware):
+
+    # instance defaults
+    defaults = { 'auto_reload': 'False',
+                 'template_dirs': '',
+                 'patterns': '*'
+                 'tags_file': None,
+                 'url': 'tags'
+                 'post_url': '.tags'
+                 }
+
+    def __init__(self, app, **kw):
+        self.app = app
+
+        # set instance parameters from kw and defaults
+        for key in self.defaults:
+            setattr(self, key, kw.get(key, self.defaults[key]))
+        self.auto_reload = self.auto_reload.lower() == 'true'
+        assert self.tags_file is not None
+        self.tags
+        self.patterns = self.patterns.strip().split()
+
+        # request handlers
+        self.handlers = [ Cloud ]
+
+        # template loader
+        self.template_dirs = self.template_dirs.split()
+        self.template_dirs.append(resource_filename(__name__, 'templates'))
+        self.loader = TemplateLoader(self.template_dirs,
+                                     auto_reload=self.auto_reload)
+
+    def __call__(self, environ, start_response):
+
+        # get a request object
+        request = Request(environ)
+
+        # get the path 
+        path = request.path_info.strip('/').split('/')
+        if path == ['']:
+            path = []
+        request.environ['path'] = path
+
+        # match the request to a handler
+        for h in self.handlers:
+            handler = h.match(self, request)
+            if handler is not None:
+                break
+        else:
+            if self.app:
+                return self.app(environ, start_response)
+            handler = exc.HTTPNotFound
+
+        # add navigation links to handler [example]
+        if hasattr(handler, 'data'):
+            handler.data.setdefault('links', [])
+            for h in self.handlers:
+                handler.data['links'].append((handler.link(h.handler_path), 
+                                              h.__name__))
+
+        # get response
+        res = handler()
+        return res(environ, start_response)