Export session expiration timestamp as environment variable

[timoguin]

Since the expiration timestamps from the STS sessions are available in the session cache, it would be nice to provide them as environment variables to the subshell, something like AWS_SESSION_EXPIRATION perhaps. It would also be nice if the CLI printed how much time was left in the session to stderr.

[nickatsegment]

Yep, those are good ideas. PRs appreciated :)

Do you think time remaining is best? Or the datetime at which it expires?

Minor detail: I think maybe AWS_OKTA_SESSION_EXPIRATION is slightly better so as to not be confused with official AWS_* vars.

[timoguin]

AWS_OKTA_SESSION_EXPIRATION makes sense to me. I think time remaining will be the useful metric. Perhaps we should print both? Something like so: Session expires in 15m at <timestamp>.

[timoguin]

Also, should we print the same info for the Okta session on a separate line? I'm not sure if that would be too noisy or not. Maybe when debug is on?

[timoguin]

I'm also happy to submit a PR for this as soon as I have the time.

[nickatsegment]

@timoguin you're my new favourite.

[nickatsegment]

Also, should we print the same info for the Okta session on a separate line? I'm not sure if that would be too noisy or not. Maybe when debug is on?

I think stick it all in debug-level for now, to get it shipped. We can promote later

[stale]

This issue has been automatically marked stale because it has not had any activity in the last 60 days. If no further activity occurs within 7 days, it will be closed. Closed does not mean "never", just that it has no momentum to get accomplished any time soon.
See CONTRIBUTING.md for more info.

[timoguin]

Closed by #230. The AWS_OKTA_SESSION_EXPIRATION env variable is now exported as a Unix timestamp. (I'll probably create a follow-up to print this in local time.) Looks like the debug logs already print the remaining time for the session:

DEBU[0000] Using session DGD3, expires in 11h6m12.402131s