feat(router): support NATS JWT credentials files

[seancribbs]

Closes #1756

Motivation and Context

Context is given in #1756, but the tl;dr is: we use decentralized JWT authentication in our NATS deployment and would like to use the same authentication method for EDFS in Cosmo Router.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[alepane21]

Hi @seancribbs,
Thanks for your contribution! 🙌
I’d suggest adding an integration test to ensure the auth functionality works as expected.
You can find the existing integration tests here:
https://github.com/wundergraph/cosmo/blob/main/router-tests/events/nats_events_test.go — there are plenty of useful examples in that file.

Let me know if you’d like any help getting started with the test or if something’s unclear. Happy to assist!

[seancribbs]

Hi @alepane21, I cannot find any integration tests exercising the other NATS authentication options. Is there somewhere I should look specifically?

[alepane21]

Hi @seancribbs,
currently there are no tests covering NATS authentication, so there’s a bit of wiring needed.

You'll likely need to bring up a NATS server with authentication enabled. There’s already a NATS server defined here, but it doesn’t have auth enabled. I believe you’ll need a separate one to avoid breaking the existing tests.

Then, you’ll need to add an option to use the authenticated NATS connection here.

Let me know if you need any help!

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