add password auth

src/ez_lan_manager/services/UserService.py

@@ -37,6 +37,13 @@ class UserService:
             raise NameNotAllowedError(disallowed_char)
         return self._db_service.update_user(user)
 
+    def is_login_valid(self, user_name_or_mail: str, password_clear_text: str) -> bool:
+        user = self.get_user(user_name_or_mail)
+        if not user:
+            return False
+        return user.user_password == sha256(password_clear_text.encode(encoding="utf-8")).hexdigest()
+
+
     def _check_for_disallowed_char(self, name: str) -> Optional[str]:
         for c in name:
             if c not in self.ALLOWED_USER_NAME_SYMBOLS: