Notify user before password expiration

[mlazzarotto]

Taking cue from this discussion: https://help.nextcloud.com/t/email-notification-for-password-expiration/148416/
A nice enhancement I'd like to see in Nextcloud is a notification to users whom password is going to expire in x days.
The notifications could be either emails or push notifications (or both?).

Ideally, there should be a toggle in the administrative settings and possibly a text box to choose how many days to send e-mails/notifications to users before the deadline.

[rockmv]

Notify user before password expiration is a very important feature if you work without an LDAP connection and need to automatically notify users when their password expires or has already expired. Would it be possible to implement that?

[R0Z-Z]

Headache... Especially many first user's accounts had been created at the same day. A day scale randomization parameter can also be added besides "Number of days until user password expires" field so that password change requests get diffused over a period of few days.

[R0Z-Z]

I'd like to add another inconvenience note about password expiry. These are simple details that cost admin time. When password expires, user is left alone with a note with no subsequent reset password link. Since their credentials are cached in their browser, they cannot return to login page, continuing in a password expired loop. The only way is to clear site cookies, where they come to admin asking what to do. Please consider fixing this behaviour too. Thanks.