adutra commented on code in PR #16023:
URL: https://github.com/apache/iceberg/pull/16023#discussion_r3105041067


##########
core/src/test/java/org/apache/iceberg/rest/auth/TestOAuth2Util.java:
##########
@@ -135,4 +136,77 @@ public void testCredentialFlowForSessionRefresh() throws 
IOException {
               any());
     }
   }
+
+  @Test
+  void refreshExpiredTokenShouldIncludeOptionalOAuthParams() throws 
IOException {
+    // expired token triggers refreshExpiredToken() which should forward 
optionalOAuthParams
+    String audience = "https://my-catalog.example.com";;
+    AuthConfig authConfig =
+        ImmutableAuthConfig.builder()
+            .keepRefreshed(true)
+            .exchangeEnabled(false)
+            .token("expired_token")
+            .credential("testClientId:testClientSecret")
+            .oauth2ServerUri("/v1/token")
+            .expiresAtMillis(System.currentTimeMillis() - 10_000)
+            .optionalOAuthParams(ImmutableMap.of("audience", audience, 
"scope", "catalog"))
+            .build();
+
+    OAuthTokenResponse response =
+        
OAuthTokenResponse.builder().withToken("refreshed_token").withTokenType(BEARER).build();
+
+    try (RESTClient client = Mockito.mock(RESTClient.class);
+        OAuth2Util.AuthSession session = new OAuth2Util.AuthSession(Map.of(), 
authConfig)) {
+      Mockito.when(client.postForm(any(), anyMap(), any(), anyMap(), 
any())).thenReturn(response);
+
+      session.refresh(client);
+
+      Mockito.verify(client)
+          .postForm(
+              any(),
+              argThat(
+                  formData ->
+                      CLIENT_CREDENTIALS.equals(formData.get(GRANT_TYPE))
+                          && audience.equals(formData.get("audience"))),

Review Comment:
   It's a bit odd to have the `audience` parameter propagated on a 
`client_credentials` grant request, but I guess it's too convoluted to 
distinguish which optional parameters should be included depending on the 
grant. And most IDPs would just ignore this parameter, I guess (except Okta / 
Auth0).



##########
core/src/test/java/org/apache/iceberg/rest/auth/TestOAuth2Util.java:
##########
@@ -135,4 +136,77 @@ public void testCredentialFlowForSessionRefresh() throws 
IOException {
               any());
     }
   }
+
+  @Test
+  void refreshExpiredTokenShouldIncludeOptionalOAuthParams() throws 
IOException {
+    // expired token triggers refreshExpiredToken() which should forward 
optionalOAuthParams
+    String audience = "https://my-catalog.example.com";;
+    AuthConfig authConfig =
+        ImmutableAuthConfig.builder()
+            .keepRefreshed(true)
+            .exchangeEnabled(false)
+            .token("expired_token")
+            .credential("testClientId:testClientSecret")
+            .oauth2ServerUri("/v1/token")
+            .expiresAtMillis(System.currentTimeMillis() - 10_000)
+            .optionalOAuthParams(ImmutableMap.of("audience", audience, 
"scope", "catalog"))
+            .build();
+
+    OAuthTokenResponse response =
+        
OAuthTokenResponse.builder().withToken("refreshed_token").withTokenType(BEARER).build();
+
+    try (RESTClient client = Mockito.mock(RESTClient.class);
+        OAuth2Util.AuthSession session = new OAuth2Util.AuthSession(Map.of(), 
authConfig)) {
+      Mockito.when(client.postForm(any(), anyMap(), any(), anyMap(), 
any())).thenReturn(response);
+
+      session.refresh(client);
+
+      Mockito.verify(client)
+          .postForm(
+              any(),
+              argThat(
+                  formData ->
+                      CLIENT_CREDENTIALS.equals(formData.get(GRANT_TYPE))
+                          && audience.equals(formData.get("audience"))),

Review Comment:
   Also, shouldn't you assert that the scope is present too?



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