nastra commented on code in PR #10256:
URL: https://github.com/apache/iceberg/pull/10256#discussion_r1601172497


##########
core/src/main/java/org/apache/iceberg/rest/RESTSessionCatalog.java:
##########
@@ -215,6 +215,12 @@ public void initialize(String name, Map<String, String> 
unresolved) {
     this.paths = ResourcePaths.forCatalogProperties(mergedProps);
 
     String token = mergedProps.get(OAuth2Properties.TOKEN);
+    // re-resolve these variables in case they were overridden by the config 
endpoint
+    credential = mergedProps.get(OAuth2Properties.CREDENTIAL);

Review Comment:
   I don't think it's actually correct to send back a `credential` to the 
client via the `config` endpoint. The client credential flow follows the OAuth2 
Spec as defined [here](https://datatracker.ietf.org/doc/html/rfc6749#autoid-49) 
(there's also a shorter example for this 
[here](https://www.oauth.com/oauth2-servers/access-tokens/client-credentials/)) 
and so sending back a client-controlled `credential` to the client doesn't feel 
right



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