feature: use app tokens for authentication

[cboehm-it]

I want to use CaPyCLI inside an automated pipeline. Therefore it's not recommended to use personal tokens because they are coupled directly with the personal user account of Github.

Idea

1. I create a Github App with necessary rights which can be shared between multiple people.
2. With the ClientId, ClientSecret and ClientCertificate I generate a short-living JWT-Token each time the pipeline runs.
   src: Generating a JSON Web Token (JWT) for a GitHub App

Expected Change

Requests with this authentication look a bit different.
src: Authentifizieren bei der REST-API

Here is an example of searching repositiories.

curl --request GET \
  --url 'https://api.github.com/search/repositories?q=Sowas' \
  --header 'Accept: application/vnd.github+json' \
  --header 'Authorization: Bearer <jwt-token>' \
  --header 'X-GitHub-Api-Version: 2022-11-28' \
  --cookie logged_in=no

[gernot-h]

@cboehm-it, perhaps it's only me, but I'm a bit confused about your idea. Is this about CI integration of CaPyCli? How would this affect authentication with SW360?

[cboehm-it]

Hey @gernot-h ,
you are right, it's about using CaPyCli inside a CI. I do not understand your question fully.
Why should the authentication against Github affect authentication against SW360?

[tngraf]

@cboehm-it Hm, I also do not really get the issue. Why should someone authenticate against GitHub? The only thing that CaPyCLI requires is access to SW360, depending on the use case either read-only or read-write.

[cboehm-it]

Hey @gernot-h and @tngraf,
it has nothing to do with SW360. You're mixing something up. CaPyCli has a functionality to get the sources of the BOM file. (bom findsources)
Therefore CaPyCli uses the official API of Github to retrieve information about that. To have a bit more requests per hour you can add the parameters with an username and a token of your personal Github user.

My idea is now that I can give CaPyCli the credentials of a Github App not from my personal user.

[gernot-h]

Ah, got it now, sorry. We're speaking about capycli bom findsources -gt. That's a part of CaPyCli I don't know that well, sorry.