[Feature Request] OAuth support for Basic authentication to authorization server's tokenUrl

[hkelley]

Current version of OAuth2Srv.scala assumes the authorization servers support the the RFC 6750 Bearer token.

Some authorization servers (Okta) only support Basic auth.
https://developer.okta.com/docs/reference/api/oidc/#token

Possible Solution

Add a configuration option to allow the selection of an authentication scheme, Bearer or Basic.
Modify OAuth2Srv.scala at around line 96 to build an appropriate Authorization header based on the configuration option.

[To-om]

The basic authentication header format is Authorization: Basic base64(user:password). I don't have user and password, so what should I put in that header ? The token ?

[hkelley]

I think I was mistaken when I opened this. The bearer token mechanism in TheHive is working with Okta (bearer/access token from Authentication servers is delivered in an HTTP Authorizaion header to /token endpoint).

[To-om]

Ok.
TheHive4 works with Okta and I'll use OAuth2 module from TheHive4 in TheHive3.