Support Samba4 AD ldap users without "email" attribute

[tanertas]

Actual behavior

Wiki.js doesn't allow login if there's no email attribute for ldap user.

Expected behavior

Wiki.js should able to map "userprincipalname" attribute to "email" thus allow AD users without "email" attribute but "userprincipalname" instead.

Steps to reproduce the behavior

Configure wiki for ldap auth using Samba4 AD with no "email" attribute then try to login.

[NGPixel]

Does userprincipalname contain an email though? It can be located in any field, but an email is required.

[tanertas]

Yes, userprincipalname contains an email for related domain which is basically in form of samaccountname@fqdn. I think we should at least have a config option for which ldap field is going to be assigned for "email".