如何获取 HiveMQ Client 中使用的密码套件?

How to get the cipher suite being used in HiveMQ Client?

我将 HiveMQ 服务器配置为识别 TLS 并创建了 TLS 通信。我想打印出正在使用的密码套件。我使用了 getSslConfig() 但我最终将其作为输出:

Optional[com.hivemq.client.internal.mqtt.MqttClientSslConfigImpl@2710]

我知道 MqttClientSslConfig.java 中有一个 getCipherSuites() 方法,但我一直没能找到使用它的方法。作为后续行动,我将如何指定使用特定的密码套件?到目前为止,我一直在使用默认的,如下所示:

代码(如何指定特定的密码套件?):

Mqtt5BlockingClient subscriber = Mqtt5Client.builder()
        .identifier(UUID.randomUUID().toString()) // the unique identifier of the MQTT client. The ID is randomly generated between 
        .serverHost("localhost")  // the host name or IP address of the MQTT server. Kept it localhost for testing. localhost is default if not specified.
        .serverPort(8883)  // specifies the port of the server
        .addConnectedListener(context -> ClientConnectionRetreiver.printConnected("Subscriber1"))        // prints a string that the client is connected
        .addDisconnectedListener(context -> ClientConnectionRetreiver.printDisconnected("Subscriber1"))  // prints a string that the client is disconnected
        .sslWithDefaultConfig()  // << How can I specify a particular cipher suite?
        .buildBlocking();  // creates the client builder

代码(我一直在尝试获取 SSL 配置):

Mqtt5ClientConfig clientConfig = client.getConfig();
System.out.println(" Ssl Configuration: " + clientConfig.getSslConfig());

您可以像这样配置特定的密码套件:

Mqtt5Client.builder()
        ...
        .sslConfig()
            .cipherSuites(Arrays.asList("TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"))
            .applySslConfig()
        ...

getSslConfigreturns一个Optional。所以要获得密码套件:

client.getConfig().getSslConfig().get().getCipherSuites()