Now assume, based on OIDC discovery spec, that keys without 'use' are
'sig' keys. Should not affect existing use-cases since existance of such
keys would have throw exceptions in prev. versions of bookstack.
For #3869
Is generally aligned with out SAML2 group sync functionality, but for
OIDC based upon feedback in #3004.
Neeeded the tangental addition of being able to define custom scopes on
the initial auth request as some systems use this to provide additional
id token claims such as groups.
Includes tests to cover.
Tested live using Okta.
Fixes issue where certain errors would not show to the user
due to extra navigation jumps which lost the error message
in the process.
This simplifies and aligns exceptions with more directly
handled exception usage at the controller level.
Fixes#3264
As per #3047.
Also made some SAML specific fixes:
- IDP initiated login was broken due to forced default session value.
Double checked against OneLogin lib docs that this reverted logic was fine.
- Changed how the saml login flow works to use 'withoutMiddleware' on
the route instead of hacking out the session driver. This was due to
the array driver (previously used for the hack) no longer being
considered non-persistent.
