pprovenzano commented on code in PR #13114:
URL: https://github.com/apache/kafka/pull/13114#discussion_r1107200727


##########
metadata/src/main/java/org/apache/kafka/image/ScramImage.java:
##########
@@ -50,6 +58,63 @@ public void write(ImageWriter writer, ImageWriterOptions 
options) {
         }
     }
 
+    public DescribeUserScramCredentialsResponseData 
describe(DescribeUserScramCredentialsRequestData request) {
+
+        List<UserName> users = request.users();
+        Map<String, Boolean> uniqueUsers = new HashMap<String, Boolean>();
+
+        if ((users == null) || (users.size() == 0)) {
+            System.out.println("Describe : get all the users");
+            // If there are no users listed then get all the users
+            for (Map<String, ScramCredentialData> scramCredentialDataSet : 
mechanisms.values()) {
+                for (String user : scramCredentialDataSet.keySet()) {
+                    uniqueUsers.put(user, false);
+                }
+            }
+        } else {
+            // Filter out duplicates
+            for (UserName user : users) {
+                if (uniqueUsers.containsKey(user.name())) {
+                    uniqueUsers.put(user.name(), true);
+                } else {
+                    uniqueUsers.put(user.name(), false);
+                }
+            }
+        }
+
+        DescribeUserScramCredentialsResponseData retval = new 
DescribeUserScramCredentialsResponseData();
+
+        for (Map.Entry<String, Boolean> user : uniqueUsers.entrySet()) {
+            DescribeUserScramCredentialsResult result = 
+              new DescribeUserScramCredentialsResult().setUser(user.getKey());
+
+            if (user.getValue() == false) {
+                List<CredentialInfo> credentialInfos = new 
ArrayList<CredentialInfo>();
+
+                boolean datafound = false;
+                for (Map.Entry<ScramMechanism, Map<String, 
ScramCredentialData>> mechanismsEntry : mechanisms.entrySet()) {
+                    Map<String, ScramCredentialData> credentialDataSet = 
mechanismsEntry.getValue();
+                    if (credentialDataSet.containsKey(user.getKey())) {
+                        credentialInfos.add(new 
CredentialInfo().setMechanism(mechanismsEntry.getKey().type())
+                                                                
.setIterations(credentialDataSet.get(user.getKey()).iterations()));
+                        datafound = true;
+                    }
+                }
+                if (datafound) {
+                    result.setCredentialInfos(credentialInfos);
+                } else {
+                    result.setErrorCode(Errors.RESOURCE_NOT_FOUND.code())

Review Comment:
   I'm not sure why there is an illegalUsers error in the Zk case as it 
explicitly tests for users.get.isEmtpy for the describe all case.



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