dimas-b commented on code in PR #952:
URL: https://github.com/apache/polaris/pull/952#discussion_r1944949296


##########
service/common/src/main/java/org/apache/polaris/service/auth/DefaultOAuth2ApiService.java:
##########
@@ -75,43 +74,39 @@ public Response getToken(
     if (!tokenBroker.supportsRequestedTokenType(requestedTokenType)) {
       return 
OAuthUtils.getResponseFromError(OAuthTokenErrorResponse.Error.invalid_request);
     }
-    if (authHeader == null && clientId == null) {
+    if (authHeader == null && clientSecret == null) {
       return 
OAuthUtils.getResponseFromError(OAuthTokenErrorResponse.Error.invalid_client);
     }
-    if (authHeader != null && clientId == null && authHeader.startsWith("Basic 
")) {
+    // token exchange with client id and client secret means the client has 
previously
+    // attempted to refresh an access token, but refreshing was not supported 
by the token broker.
+    // Accept the client id and secret and treat it as a new token request
+    if (authHeader != null && clientSecret == null && 
authHeader.startsWith("Basic ")) {

Review Comment:
   Thanks, @adutra . I missed that option :facepalm: 



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