Fix some stuff with logins and permissions, add tags to the mode.

util/names.py

@@ -0,0 +1,22 @@
+import urllib
+
+from functools import wraps
+
+
+def parse_namespace_repository(repository):
+  parts = repository.rstrip('/').split('/', 1)
+  if len(parts) < 2:
+    namespace = 'library'
+    repository = parts[0]
+  else:
+    (namespace, repository) = parts
+  repository = urllib.quote_plus(repository)
+  return (namespace, repository)
+
+
+def parse_repository_name(f):
+  @wraps(f)
+  def wrapper(repository, *args, **kwargs):
+    (namespace, repository) = parse_namespace_repository(repository)
+    return f(namespace, repository, *args, **kwargs)
+  return wrapper