wip

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/FeatureService.java

@@ -8,6 +8,7 @@ import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.function.Predicate;
 import javax.annotation.Nullable;
 import lombok.RequiredArgsConstructor;
@@ -53,7 +54,7 @@ public class FeatureService {
 
   private Mono<ClusterFeature> topicDeletionEnabled(KafkaCluster cluster, @Nullable Node controller) {
     if (controller == null) {
-      return Mono.empty();
+      return Mono.just(ClusterFeature.TOPIC_DELETION); // assuming it is enabled by default
     }
     return adminClientService.get(cluster)
         .flatMap(ac -> ac.loadBrokersConfig(List.of(controller.id())))
@@ -64,11 +65,13 @@ public class FeatureService {
                 .map(e -> Boolean.parseBoolean(e.value()))
                 .findFirst()
                 .orElse(true))
-        .flatMap(enabled -> enabled ? Mono.just(ClusterFeature.TOPIC_DELETION) : Mono.empty());
+        .flatMap(enabled -> enabled
+            ? Mono.just(ClusterFeature.TOPIC_DELETION)
+            : Mono.empty());
   }
 
   private Mono<ClusterFeature> aclEdit(ClusterDescription clusterDescription) {
-    var authorizedOps = clusterDescription.getAuthorizedOperations();
+    var authorizedOps = Optional.ofNullable(clusterDescription.getAuthorizedOperations()).orElse(Set.of());
     boolean canEdit = authorizedOps.contains(AclOperation.ALL) || authorizedOps.contains(AclOperation.ALTER);
     return canEdit
         ? Mono.just(ClusterFeature.KAFKA_ACL_EDIT)

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/ReactiveAdminClient.java

@@ -115,6 +115,7 @@ public class ReactiveAdminClient implements Closeable {
     Node controller;
     String clusterId;
     Collection<Node> nodes;
+    @Nullable // null, if ACL is disabled
     Set<AclOperation> authorizedOperations;
   }