Add make default option for authmails

[jandolejs]

Adds possibility to make email as default option for login.

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#number

[cedric-anne]

Thanks for the contribution.

If there are multiple authentication sources that may have the is_default=true property, then it will be ambiguous for both the system and the administrators.
To prevent any ambiguity, the technical solution could be to replace the is_default field of glpi_authldaps table into a authentication_default_type config (could be Auth::DB_GLPI, Auth::MAIL, Auth::LDAP, ...) and a authentication_default_items_id config (would contains the ID of the AuthMail or AuthLDAP item). These configurations could be then changed in the /front/auth.settings.php page for instance.
@orthagh Would this be acceptable for you?

Anyway, this kind of change should target the main branch (to be included in GLPI 10.1.x), but you can still apply this patch on your GLPI instance.

[jandolejs]

How about changing that field into item_order or item_priority so you can set order for each item? We use only 2 auths but sure there must be someone who uses way more

[jandolejs]

or use this as temporary fix untill its fixed properly since soneone fixes it :)

[cedric-anne]

How about changing that field into item_order or item_priority so you can set order for each item? We use only 2 auths but sure there must be someone who uses way more

Handling authentication sources priority could also be a solution, but IMHO, it would require a new table (e.g. glpi_authpriorities) to store the priority of each authentication source in order to ensure that priorities are centralized and in order to be able to define a unicity key on the priority itself.

It may help to improve the authentication responsiveness for any GLPI instances that has many authentication sources but many of them rarely used, but would require much work.