Add option for custom auth

[patrykkotlowski-dsstream]

Custom authentication

This PR provides an option for the users to use custom authentication mechanism.

What's changed:

• New options were added to the configuration
• There is an option to create custom oauth provider
• There is an option for custom JWT token check.

[dokterbob]

Thanks for the contrib @patrykkotlowski-dsstream!

Do you see any way of using this work to arrive at a more generic pluggable auth? We're really looking forward to move support of auth frameworks more towards the community, so we'd rather remove than add new methods.

But if yours could be refactored towards having more pluggable auth methods (e.g. all auth methods are classes) that can be easily swapped, which can be returned from a single call back hook, that might be really nice.

In addition, before we merge this in, we'd really like to see both E2E and unit tests. Otherwise, it's really hard for us to ensure that it won't break time and again while building on other stuff.

What do you think?

[patrykkotlowski-dsstream]

Hi, thank you for the feedback!

I would be more than happy to add both E2E and unit tests to ensure the stability of the implementation. Also, I’m definitely interested in refactoring the auth methods in the future to make them more pluggable, as suggested. However, if it’s okay with you, I’d prefer to handle that refactor in a separate PR, since I’m currently focused on adding the CustomAuth provider as quickly as possible.

Let me know your thoughts!