sharing: add global and conditional permissions support

config

@@ -317,6 +317,22 @@
 # Share collection by map
 #collection_by_map = false
 
+# Permit create of token-based sharing
+#  If False it can be explicitly granted by permissions: t
+#  If True it can be explicitly forbidden by permissions: T
+#permit_create_token = false
+
+# Permit create of map-based sharing
+#  If False it can be explicitly granted by permissions: m
+#  If True it can be explicitly forbidden by permissions: M
+#permit_create_map = false
+
+# Default permissions for token-based sharing
+#default_permissions_create_token = r
+
+# Default permissions for map-based sharing
+#default_permissions_create_map = r
+
 
 [web]