TaiJuWu commented on code in PR #18578:
URL: https://github.com/apache/kafka/pull/18578#discussion_r1918916873


##########
core/src/test/scala/unit/kafka/server/KafkaApisTest.scala:
##########
@@ -3561,6 +3561,115 @@ class KafkaApisTest extends Logging {
     assertEquals(Set(0), response.brokers.asScala.map(_.id).toSet)
   }
 
+  @Test
+  def testUnauthorizedTopicMetadataRequest(): Unit = {
+    // 1. Set up broker information
+    val plaintextListener = 
ListenerName.forSecurityProtocol(SecurityProtocol.PLAINTEXT)
+    val broker = new UpdateMetadataBroker()
+      .setId(0)
+      .setRack("rack")
+      .setEndpoints(Seq(
+        new UpdateMetadataEndpoint()
+          .setHost("broker0")
+          .setPort(9092)
+          .setSecurityProtocol(SecurityProtocol.PLAINTEXT.id)
+          .setListener(plaintextListener.value)
+      ).asJava)
+
+    // 2. Set up authorizer
+    val authorizer: Authorizer = mock(classOf[Authorizer])
+    val unauthorizedTopic = "unauthorized-topic"
+    val authorizedTopic = "authorized-topic"
+
+    val expectedActions = Seq(
+      new Action(AclOperation.DESCRIBE, new 
ResourcePattern(ResourceType.TOPIC, unauthorizedTopic, PatternType.LITERAL), 1, 
true, true),
+      new Action(AclOperation.DESCRIBE, new 
ResourcePattern(ResourceType.TOPIC, authorizedTopic, PatternType.LITERAL), 1, 
true, true)
+    )
+
+    when(authorizer.authorize(any[RequestContext], argThat((t: 
java.util.List[Action]) => t.containsAll(expectedActions.asJava))))
+      .thenAnswer { invocation =>
+        val actions = 
invocation.getArgument(1).asInstanceOf[util.List[Action]].asScala
+        actions.map { action =>
+          if (action.resourcePattern().name().equals(authorizedTopic))
+            AuthorizationResult.ALLOWED
+          else
+            AuthorizationResult.DENIED
+        }.asJava
+      }
+
+    // 3. Set up MetadataCache
+    val authorizedTopicId = Uuid.randomUuid()
+    val unauthorizedTopicId = Uuid.randomUuid()
+
+    val topicIds = new util.HashMap[String, Uuid]()
+    topicIds.put(authorizedTopic, authorizedTopicId)
+    topicIds.put(unauthorizedTopic, unauthorizedTopicId)
+
+    def createDummyPartitionStates(topic: String) = {
+      new UpdateMetadataPartitionState()
+        .setTopicName(topic)
+        .setPartitionIndex(0)
+        .setControllerEpoch(0)
+        .setLeader(0)
+        .setLeaderEpoch(0)
+        .setReplicas(Collections.singletonList(0))
+        .setZkVersion(0)
+        .setIsr(Collections.singletonList(0))
+    }
+
+    // Send UpdateMetadataReq to update MetadataCache
+    val partitionStates = Seq(unauthorizedTopic, 
authorizedTopic).map(createDummyPartitionStates)
+
+    val updateMetadataRequest = new 
UpdateMetadataRequest.Builder(ApiKeys.UPDATE_METADATA.latestVersion, 0,
+      0, 0, partitionStates.asJava, Seq(broker).asJava, topicIds).build()
+    MetadataCacheTest.updateCache(metadataCache, updateMetadataRequest)

Review Comment:
   Yes, this is already trace by 
https://issues.apache.org/jira/browse/KAFKA-18540.
   I will handle it ASAP.



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