[GitHub] [beam] EgbertW commented on pull request #25024: Add withDefaultHeaders to connection configuration for ElasticsearchIO

[GitBox <gi...@apache.org>]

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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