Different rights management backends

Initially only one backend - regular expressions based

radicale/rights/__init__.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Radicale Server - Calendar Server
+# Copyright © 2012-2013 Guillaume Ayoub
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This library 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Rights backends.
+
+This module loads the rights backend, according to the rights
+configuration.
+
+"""
+import sys
+
+from .. import config
+
+
+def load():
+    """Load list of available storage managers."""
+    storage_type = config.get("rights", "backend")
+    root_module = __import__(
+        "rights.%s" % storage_type, globals=globals(), level=2)
+    module = getattr(root_module, storage_type)
+    sys.modules[__name__].authorized = module.authorized
+    return module
+
+
+def authorized(user, collection, right):
+    """ Check when user has rights on collection
+    This method is overriden when appropriate rights backend loaded.
+    """
+    raise NotImplementedError()