bugfix : fix user_entry validation control

[tomamplius]

search_s return list or None (see https://www.python-ldap.org/en/python-ldap-3.4.3/reference/ldap.html?highlight=search_s#ldap.LDAPObject.search_s)

On my case search_s never return None
User exists

>>> user_entry = conn.search_s(
... "DC=lan,DC=lgy,DC=fr",
... ldap.SCOPE_SUBTREE,
... f"(&(objectClass=user)(|(cn=thomas)(sAMAccountName=thomas)(mail=thomas@lgy.fr)))",
... ["name", "mail"],
... )
>>> user_entry
[('CN=thomas,CN=Users,DC=lan,DC=lgy,DC=fr', {'name': [b'thomas'], 'mail': [b'thomas@lgy.fr']}), (None, ['ldaps://lan.lgy.fr/CN=Configuration,DC=lan,DC=lgy,DC=fr']), (None, ['ldaps://lan.lgy.fr/DC=DomainDnsZones,DC=lan,DC=lgy,DC=fr']), (None, ['ldaps://lan.lgy.fr/DC=ForestDnsZones,DC=lan,DC=lgy,DC=fr'])]
>>> not user_entry
False

User not exists

>>> user_entry2 = conn.search_s(
... "DC=lan,DC=lgy,DC=fr",
... ldap.SCOPE_SUBTREE,
... f"(&(objectClass=user)(|(cn=none)(sAMAccountName=none)(mail=none@lgy.fr)))",
... ["name", "mail"],
... )
>>> user_entry2
[(None, ['ldaps://lan.lgy.fr/CN=Configuration,DC=lan,DC=lgy,DC=fr']), (None, ['ldaps://lan.lgy.fr/DC=DomainDnsZones,DC=lan,DC=lgy,DC=fr']), (None, ['ldaps://lan.lgy.fr/DC=ForestDnsZones,DC=lan,DC=lgy,DC=fr'])]
>>> not user_entry2
False

[tomamplius]

Check with new syntaxe

root@thomas-XPS15:/usr/share/mealie# poetry run black . --check
All done! ✨ 🍰 ✨
338 files would be left unchanged.

[tomamplius]

i think this PR fix #1775

[tomamplius]

Sorry first time i use poetry

cat mealie/core/security/security.py | tail -n 70 | head -n 20
        ldap.SCOPE_SUBTREE,
        f"(&(objectClass=user)(|(cn={username})(sAMAccountName={username})(mail={username})))",
        ["name", "mail"],
    )
    if not user_entry is None and not user_entry[0][0] is None:
        user_dn, user_attr = user_entry[0]
    else:
        return False

    if user is None:
        user = db.users.create(
            {
                "username": username,
                "password": "LDAP",
                "full_name": user_attr["name"][0],
                "email": user_attr["mail"][0],
                "admin": False,
            },
        )

root@thomas-XPS15:/usr/share/mealie# poetry run black . --check
All done! ✨ 🍰 ✨
858 files would be left unchanged.

[tomamplius]

@hay-kot please approve running workflow

[hay-kot]

Thanks for following up on this!