C0urante commented on code in PR #12010: URL: https://github.com/apache/kafka/pull/12010#discussion_r856198705
########## clients/src/main/java/org/apache/kafka/clients/CommonClientConfigs.java: ########## @@ -203,4 +205,15 @@ public static Map<String, Object> postProcessReconnectBackoffConfigs(AbstractCon } return rval; } + + public static void postValidateSaslMechanismConfig(AbstractConfig config) { + SecurityProtocol securityProtocol = SecurityProtocol.forName(config.getString(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG)); + String clientSaslMechanism = config.getString(SaslConfigs.SASL_MECHANISM); + if (securityProtocol == SecurityProtocol.SASL_PLAINTEXT || securityProtocol == SecurityProtocol.SASL_SSL) { + if (clientSaslMechanism == null || clientSaslMechanism.trim().isEmpty()) { + throw new ConfigException(SaslConfigs.SASL_MECHANISM, null, "When the " + CommonClientConfigs.SECURITY_PROTOCOL_CONFIG + + " configuration enables the SASL mechanism, mechanism must be non-null or non-empty string."); Review Comment: Nit: ```suggestion " configuration enables SASL, mechanism must be non-null and non-empty"); ``` ########## clients/src/main/java/org/apache/kafka/clients/admin/AdminClientConfig.java: ########## @@ -220,6 +223,7 @@ public class AdminClientConfig extends AbstractConfig { @Override protected Map<String, Object> postProcessParsedConfig(final Map<String, Object> parsedValues) { + CommonClientConfigs.postValidateSaslMechanismConfig(this); Review Comment: This is pretty smooth--you've only added one line to an existing method in this class, and we now get intelligent, conditional validation of the SASL mechanism config. Nice job! ########## clients/src/test/java/org/apache/kafka/clients/admin/AdminClientConfigTest.java: ########## @@ -0,0 +1,52 @@ +/* + * 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.kafka.clients.admin; + +import org.apache.kafka.clients.CommonClientConfigs; +import org.apache.kafka.common.config.ConfigException; +import org.apache.kafka.common.config.SaslConfigs; +import org.apache.kafka.common.security.auth.SecurityProtocol; +import org.junit.jupiter.api.Test; + +import java.util.HashMap; +import java.util.Map; + +import static org.junit.jupiter.api.Assertions.assertThrows; +import static org.junit.jupiter.api.Assertions.assertTrue; + +public class AdminClientConfigTest { + + @Test + public void testInvalidSaslMechanism() { + Map<String, Object> configs = new HashMap<>(); + configs.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, SecurityProtocol.SASL_PLAINTEXT.name); + configs.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:8121"); + configs.put(SaslConfigs.SASL_MECHANISM, null); + ConfigException ce = assertThrows(ConfigException.class, () -> new AdminClientConfig(configs)); + assertTrue(ce.getMessage().contains(SaslConfigs.SASL_MECHANISM)); + + configs.put(SaslConfigs.SASL_MECHANISM, ""); + ce = assertThrows(ConfigException.class, () -> new AdminClientConfig(configs)); + assertTrue(ce.getMessage().contains(SaslConfigs.SASL_MECHANISM)); + + configs.put(SaslConfigs.SASL_MECHANISM, " "); + ce = assertThrows(ConfigException.class, () -> new AdminClientConfig(configs)); + assertTrue(ce.getMessage().contains(SaslConfigs.SASL_MECHANISM)); Review Comment: Nit: I don't think it's worth adding this test case. At this point we're really verifying the behavior of the `AbstractConfig` and `ConfigDef` classes and how they automatically trim strings, not any special logic in the `AdminClient` class itself. ########## clients/src/main/java/org/apache/kafka/clients/CommonClientConfigs.java: ########## @@ -203,4 +205,15 @@ public static Map<String, Object> postProcessReconnectBackoffConfigs(AbstractCon } return rval; } + + public static void postValidateSaslMechanismConfig(AbstractConfig config) { + SecurityProtocol securityProtocol = SecurityProtocol.forName(config.getString(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG)); + String clientSaslMechanism = config.getString(SaslConfigs.SASL_MECHANISM); + if (securityProtocol == SecurityProtocol.SASL_PLAINTEXT || securityProtocol == SecurityProtocol.SASL_SSL) { + if (clientSaslMechanism == null || clientSaslMechanism.trim().isEmpty()) { Review Comment: Nit: We don't need to `trim` here, do we? ```suggestion if (clientSaslMechanism == null || clientSaslMechanism.isEmpty()) { ``` -- This is an automated message from the Apache Git Service. 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