smjn commented on code in PR #18929:
URL: https://github.com/apache/kafka/pull/18929#discussion_r2077332609


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -3620,7 +3620,50 @@ class KafkaApis(val requestChannel: RequestChannel,
 
   def handleAlterShareGroupOffsetsRequest(request: RequestChannel.Request): 
Unit = {
     val alterShareGroupOffsetsRequest = 
request.body[AlterShareGroupOffsetsRequest]
-    requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
+    val groupId = alterShareGroupOffsetsRequest.data.groupId
+
+    if (!isShareGroupProtocolEnabled) {
+      requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
+    } else if (!authHelper.authorize(request.context, READ, GROUP, groupId)) {
+      requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.GROUP_AUTHORIZATION_FAILED.exception))
+    } else {
+      val responseBuilder = new AlterShareGroupOffsetsResponse.Builder()
+      val authorizedTopicPartitions = new 
AlterShareGroupOffsetsRequestData.AlterShareGroupOffsetsRequestTopicCollection()
+
+      alterShareGroupOffsetsRequest.data.topics.forEach(topic => {
+        val invalidTopicError = checkValidTopic(topic.topicName())
+        val topicError = invalidTopicError.orElse {
+          if (!authHelper.authorize(request.context, READ, TOPIC, 
topic.topicName())) {
+            Some(new ApiError(Errors.TOPIC_AUTHORIZATION_FAILED))
+          } else if (!metadataCache.contains(topic.topicName()))

Review Comment:
   enclose this in braces as well



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