EgbertW commented on PR #25024:
URL: https://github.com/apache/beam/pull/25024#issuecomment-1384988804
> I'm not denying the utility here, but I'm not 100% clear on how this
addresses #25018. Could you elaborate on how this technique can be used to work
with short-lived credentials?
Of course. What I did to work with short-lived tokens is create a new header
class, something resembling:
```
class OauthTokenHeader extends BasicHeader {
OIDCIDToken accessToken;
...
@Override
public String getValue() {
if (accessToken.isExpired()) {
accessToken.renew();
}
return String.format("Bearer %s", accessToken.getToken());
}
}
```
Since the Elasticsearch RestClient will add the `defaultHeaders` on each
outgoing request, it will invoke `getValue` on every request, giving the
opportunity to check if the token has expired and if so, renew it.
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