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Add Kafka Java client examples for KoP with token authentication (#71)
NOTE: The token authentication in KoP is just the PLAIN mechanism.
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‎.gitignore

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# Intellij
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.idea
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*.iml

‎kop/README.md

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# Overview
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This directory includes examples of how Kafka clients connect to a KoP cluster through the Token authentication plugin.
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- Supported Kafka clients
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- [Java client](https://github.com/streamnative/pulsar-examples/tree/master/kop/java)
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- TODO: examples of other clients should be added

‎kop/java/README.md

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# Overview
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This document describes how to produce messages to and consume messages from a KoP cluster using the Kafka client.
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# Prerequisites
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- Java 1.8 or higher version
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- Maven
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> **NOTE**
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>
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> This example uses Kafka client 2.0.0. If you want to use another version of Kafka client, you can change the `kafka.version` property in `pom.xml` file. Kafka client version 1.0.0 - 2.6.0 are supported.
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# Example
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See [KoP Security](https://github.com/streamnative/kop/blob/master/docs/security.md) for how to configure KoP with token authentication. This example takes a topic named `my-topic` under `public/default` namespace as reference.
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1. Grant produce and consume permissions to the specific role.
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```bash
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bin/pulsar-admin namespaces grant-permission public/default \
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--role <role> \
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--actions produce,consume
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```
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> **NOTE**
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>
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> The `conf/client.conf` should be configured. For details, see [Configure CLI Tools](http://pulsar.apache.org/docs/en/security-jwt/#cli-tools).
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2. Configure the token in [token.properties](src/main/resources/token.properties).
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```properties
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topic=persistent://public/default/my-topic
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namespace=public/default
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token=token:<token-of-the-role>
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```
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3. Compile the project.
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```
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mvn clean compile
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```
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4. Run a Kafka producer to produce a `hello` message.
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```bash
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mvn exec:java -Dexec.mainClass=io.streamnative.examples.kafka.TokenProducer
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```
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**Output:**
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```
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Send hello to persistent://public/default/my-topic-0@0
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```
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5. Run a Kafka consumer to consume some messages.
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```bash
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mvn exec:java -Dexec.mainClass=io.streamnative.examples.kafka.TokenConsumer
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```
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**Output:**
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```
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Receive record: hello from persistent://public/default/my-topic-0@0
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```

‎kop/java/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>java</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<kafka.version>2.0.0</kafka.version>
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<slf4j.simple.version>1.7.30</slf4j.simple.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.apache.kafka</groupId>
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<artifactId>kafka-clients</artifactId>
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<version>${kafka.version}</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-simple</artifactId>
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<version>${slf4j.simple.version}</version>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎kop/java/src/main/java/io/streamnative/examples/kafka/TokenConsumer.java

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/**
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.streamnative.examples.kafka;
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import java.io.IOException;
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import java.time.Duration;
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import java.util.Collections;
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import java.util.Properties;
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import org.apache.kafka.clients.consumer.ConsumerConfig;
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import org.apache.kafka.clients.consumer.ConsumerRecords;
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import org.apache.kafka.clients.consumer.KafkaConsumer;
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import org.apache.kafka.common.serialization.StringDeserializer;
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/**
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* A token authentication example of Kafka consumer.
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*/
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public class TokenConsumer {
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public static void main(String[] args) throws IOException {
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// 1. Get the configured parameters from token.properties
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final Properties tokenProps = new Properties();
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tokenProps.load(TokenProducer.class.getClassLoader().getResourceAsStream("token.properties"));
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final String bootstrapServers = tokenProps.getProperty("bootstrap.servers");
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final String topic = tokenProps.getProperty("topic");
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final String group = tokenProps.getProperty("group");
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final String namespace = tokenProps.getProperty("namespace");
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final String token = tokenProps.getProperty("token");
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// 2. Create a consumer with token authentication, which is equivalent to SASL/PLAIN mechanism in Kafka
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final Properties props = new Properties();
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props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
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props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
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props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
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props.put(ConsumerConfig.GROUP_ID_CONFIG, group);
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props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
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props.put("security.protocol", "SASL_PLAINTEXT");
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props.put("sasl.mechanism", "PLAIN");
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props.put("sasl.jaas.config", String.format(
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"org.apache.kafka.common.security.plain.PlainLoginModule required username=\"%s\" password=\"%s\";",
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namespace, token));
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final KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
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consumer.subscribe(Collections.singleton(topic));
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// 3. Consume some messages and quit immediately
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boolean running = true;
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while (running) {
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final ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(1));
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if (!records.isEmpty()) {
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records.forEach(record -> System.out.println("Receive record: " + record.value() + " from "
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+ record.topic() + "-" + record.partition() + "@" + record.offset()));
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running = false;
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}
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}
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consumer.close();
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}
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}

‎kop/java/src/main/java/io/streamnative/examples/kafka/TokenProducer.java

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/**
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.streamnative.examples.kafka;
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import java.io.IOException;
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import java.util.Properties;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Future;
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import org.apache.kafka.clients.producer.KafkaProducer;
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import org.apache.kafka.clients.producer.ProducerConfig;
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import org.apache.kafka.clients.producer.ProducerRecord;
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import org.apache.kafka.clients.producer.RecordMetadata;
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import org.apache.kafka.common.serialization.StringSerializer;
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/**
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* A token authentication example of Kafka producer.
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*/
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public class TokenProducer {
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public static void main(String[] args) throws ExecutionException, InterruptedException, IOException {
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// 1. Get the configured parameters from token.properties
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final Properties tokenProps = new Properties();
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tokenProps.load(TokenProducer.class.getClassLoader().getResourceAsStream("token.properties"));
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final String bootstrapServers = tokenProps.getProperty("bootstrap.servers");
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final String topic = tokenProps.getProperty("topic");
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final String namespace = tokenProps.getProperty("namespace");
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final String token = tokenProps.getProperty("token");
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// 2. Create a producer with token authentication, which is equivalent to SASL/PLAIN mechanism in Kafka
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final Properties props = new Properties();
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props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
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props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
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props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
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props.put("security.protocol", "SASL_PLAINTEXT");
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props.put("sasl.mechanism", "PLAIN");
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props.put("sasl.jaas.config", String.format(
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"org.apache.kafka.common.security.plain.PlainLoginModule required username=\"%s\" password=\"%s\";",
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namespace, token));
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final KafkaProducer<String, String> producer = new KafkaProducer<>(props);
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// 3. Produce one message
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final Future<RecordMetadata> recordMetadataFuture = producer.send(new ProducerRecord<>(topic, "hello"));
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final RecordMetadata recordMetadata = recordMetadataFuture.get();
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System.out.println("Send hello to " + recordMetadata);
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producer.close();
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}
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}

‎kop/java/src/main/resources/simplelogger.properties

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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# http://www.slf4j.org/api/org/slf4j/impl/SimpleLogger.html
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org.slf4j.simpleLogger.defaultLogLevel=info
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org.slf4j.simpleLogger.showDateTime=true
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org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd HH:mm:ss:SSS

‎kop/java/src/main/resources/token.properties

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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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bootstrap.servers=localhost:9092
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topic=persistent://public/default/my-topic
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group=my-group
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namespace=public/default
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token=token:<token>

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