Extend HTTP probe type to add support for OAuth-authenticated probes

[manugarg]

No description provided.

[p-singh]

@manugarg I would like to contribute to this feature. Could you let me know what initial ideas you have in mind and some pointers to start and I shall take it up from there?

[manugarg]

@p-singh That's great. I actually didn't give much thought to the implementation, but thinking about it now, it seems like main challenge is going to be abstracting out various credential formats. I am most familiar with Google style credentials and for those, first step could simply be supporting Application Default Credentials:
https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application

What use case did you have in mind for this feature. Understanding that could be useful in planning this further.

[manugarg]

Wrote some ideas here:
https://gist.github.com/manugarg/1726dfbbc312c0a074d592140dae9aee

[manugarg]

Assigning to myself as I have started working on it.

[manugarg]

2410e7e added OAuth support for HTTP probe.

[manugarg]

Support for JWT as web token: 0ee300c

Next up, I'll be adding support for reading JSON key file (and other files) from GCS.

[manugarg]

This is now available in the v0.10.7 release:
https://github.com/google/cloudprober/releases/tag/v0.10.7