lhotari commented on code in PR #25052:
URL: https://github.com/apache/pulsar/pull/25052#discussion_r2603148157


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth/oauth2/AuthenticationOAuth2StandardAuthzServer.java:
##########
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.client.impl.auth.oauth2;
+
+import java.io.IOException;
+import java.time.Clock;
+import java.util.Map;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.pulsar.client.impl.AuthenticationUtil;
+import 
org.apache.pulsar.client.impl.auth.oauth2.protocol.DefaultMetadataResolver;
+
+/**
+ * Pulsar client authentication provider based on OAuth 2.0 using RFC 8414 
standard metadata path.
+ * This class is identical to {@link AuthenticationOAuth2} but it always uses 
the standard
+ * "/.well-known/oauth-authorization-server" metadata path as defined in RFC 
8414.
+ */
+public class AuthenticationOAuth2StandardAuthzServer extends 
AuthenticationOAuth2 {
+
+    private static final long serialVersionUID = 1L;
+
+    public AuthenticationOAuth2StandardAuthzServer() {
+        super();
+    }
+
+    AuthenticationOAuth2StandardAuthzServer(Flow flow, Clock clock) {
+        super(flow, clock);
+    }
+
+    @Override
+    public void configure(String encodedAuthParamString) {
+        if (StringUtils.isBlank(encodedAuthParamString)) {
+            throw new IllegalArgumentException("No authentication parameters 
were provided");
+        }
+        Map<String, String> params;
+        try {
+            params = 
AuthenticationUtil.configureFromJsonString(encodedAuthParamString);
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Malformed authentication 
parameters", e);
+        }
+
+        // Always set the OAuth 2.0 standard metadata path
+        params.put(FlowBase.CONFIG_PARAM_WELL_KNOWN_METADATA_PATH,
+                DefaultMetadataResolver.OAUTH_WELL_KNOWN_METADATA_PATH);
+
+        String type = params.getOrDefault(CONFIG_PARAM_TYPE, 
TYPE_CLIENT_CREDENTIALS);
+        switch(type) {
+            case TYPE_CLIENT_CREDENTIALS:
+                this.flow = ClientCredentialsFlow.fromParameters(params);
+                break;
+            default:
+                throw new IllegalArgumentException("Unsupported authentication 
type: " + type);
+        }
+    }
+}

Review Comment:
   What's the purpose of this class? Could we eliminate this?



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