d8tltanc commented on a change in pull request #9485:
URL: https://github.com/apache/kafka/pull/9485#discussion_r529090156



##########
File path: core/src/main/scala/kafka/security/authorizer/AuthorizerWrapper.scala
##########
@@ -175,4 +179,69 @@ class AuthorizerWrapper(private[kafka] val baseAuthorizer: 
kafka.security.auth.A
   override def close(): Unit = {
     baseAuthorizer.close()
   }
+
+  override def authorizeByResourceType(requestContext: 
AuthorizableRequestContext,
+                                       op: AclOperation,
+                                       resourceType: ResourceType): 
AuthorizationResult = {
+    if (resourceType == ResourceType.ANY)
+      throw new IllegalArgumentException("Must specify a non-filter resource 
type for authorizeByResourceType")
+
+    if (resourceType == ResourceType.UNKNOWN)
+      throw new IllegalArgumentException("Unknown resource type")
+
+    if (op == AclOperation.ANY)
+      throw new IllegalArgumentException("Must specify a non-filter operation 
type for authorizeByResourceType")
+
+    if (op == AclOperation.UNKNOWN)
+      throw new IllegalArgumentException("Unknown operation type")
+
+    if (shouldAllowEveryoneIfNoAclIsFound && !denyAllResource(requestContext, 
op, resourceType)) {
+      AuthorizationResult.ALLOWED
+    } else {
+      super.authorizeByResourceType(requestContext, op, resourceType)
+    }
+  }
+
+  def denyAllResource(requestContext: AuthorizableRequestContext,
+                      op: AclOperation,
+                      resourceType: ResourceType): Boolean = {
+    val resourceTypeFilter = new ResourcePatternFilter(
+      resourceType, null, PatternType.ANY)
+    val accessControlEntry = new AccessControlEntryFilter(
+      null, null, null, AclPermissionType.DENY)
+    val aclFilter = new AclBindingFilter(resourceTypeFilter, 
accessControlEntry)
+
+    for (binding <- acls(aclFilter).asScala) {
+      if (aceMatched(requestContext, op, binding) && 
canDenyAll(binding.pattern()))
+        return true
+    }
+    false
+  }
+
+  def aceMatched(requestContext: AuthorizableRequestContext,
+                 op: AclOperation,
+                 binding: AclBinding): Boolean = {
+    (hostMatched(requestContext, binding) && principleMatched(requestContext, 
binding)

Review comment:
       Yeah. But I'd guess that the compiler will optimize for us. 
   
   commit 3906f978e62255ff266f081bf646a4b3c6b896ad 




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