Allow attach custom rights backend, small fix in default config file

config

@@ -105,12 +105,15 @@ committer = Firstname Lastname <Radicale@Radicale.org>
 [rights]
 # Rights backend
 # Value: regex
-backend = "regex"
+backend = regex
 
 # Rights management method
-# Value: None | owner_only | owner_write | from_file
+# Value: None | owner_only | owner_write | from_file | custom
 type = None
 
+# Rights custom handler
+custom_handler =
+
 # File for rights management from_file
 file = ~/.config/radicale/rights
 

radicale/config.py

@@ -78,6 +78,7 @@ INITIAL_CONFIG = {
     "rights": {
         "backend": "regex",
         "type": "None",
+        "custom_handler": "",
         "file": "~/.config/radicale/rights"},
     "storage": {
         "type": "filesystem",

radicale/rights/__init__.py

@@ -31,9 +31,14 @@ 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)
+    if storage_type == 'custom':
+        rights_module = config.get("rights", "custom_handler")
+        __import__(rights_module)
+        module = sys.modules[rights_module]
+    else:
+        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