Fix and harden linter checks.

Harden the requirements of mypy, and also check against flake8
docstrings. And fix all errors and warnings resulting from that.

1 files changed, 11 insertions, 2 deletions

diff --git a/mu4web/user/local.py b/mu4web/user/local.py
index 37e88cb..c7936d6 100644
--- a/mu4web/user/local.py
+++ b/mu4web/user/local.py
@@ -1,12 +1,21 @@
+"""
+User authentication through local password store.
+
+Currently (hard codedly) loads the file password.json from the current
+path. Take care.
+"""
+
 from .. import password
 from ..password import Passwords
 from typing import cast
 import os
 from . import User
 
-passwords: Passwords = password.Passwords(cast(os.PathLike, 'passwords.json'))
+passwords: Passwords = password.Passwords(cast(os.PathLike[str], 'passwords.json'))
 
 
 class LocalUser(User):
-    def validate(self, password: str) -> bool:
+    """Authenticate user through local password file."""
+
+    def validate(self, password: str) -> bool:  # noqa: 201
         return passwords.validate(self._username, password)