Adding staticdirect infrastructure from cc.engine

mediagoblin/staticdirect.py

@@ -0,0 +1,72 @@
+# GNU Mediagoblin -- federated, autonomous media hosting
+# Copyright (C) 2011 Free Software Foundation, Inc
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import pkg_resources
+import urlparse
+
+####################################
+# Staticdirect infrastructure.
+# Borrowed largely from cc.engine
+# by Chris Webber & Creative Commons
+# 
+# This needs documentation!
+####################################
+
+import pkg_resources
+import urlparse
+
+class StaticDirect(object):
+    def __init__(self):
+        self.cache = {}
+
+    def __call__(self, filepath):
+        if self.cache.has_key(filepath):
+            return self.cache[filepath]
+
+        static_direction = self.cache[filepath] = self.get(filepath)
+        return static_direction
+        
+
+    def get(self, filepath):
+        # should be implemented by the individual staticdirector
+        pass
+
+
+class RemoteStaticDirect(StaticDirect):
+    def __init__(self, remotepath):
+        StaticDirect.__init__(self)
+        self.remotepath = remotepath.rstrip('/')
+
+    def get(self, filepath):
+        return '%s/%s' % (
+            self.remotepath, filepath.lstrip('/'))
+
+
+class MultiRemoteStaticDirect(StaticDirect):
+    """
+    For whene separate sections of the static data is served under
+    separate urls.
+    """
+    def __init__(self, remotepaths):
+        StaticDirect.__init__(self)
+        self.remotepaths = remotepaths
+
+    def get(self, filepath):
+        section, rest = filepath.strip('/').split('/', 1)
+
+        return '%s/%s' % (
+            self.remotepaths[section].rstrip('/'),
+            rest.lstrip('/'))