Scala中使用证书进行MQTT认证

Scala中使用证书进行MQTT认证

在Scala中使用证书进行MQTT认证，您可以使用Eclipse Paho MQTT客户端库和Java的SSLContext类。以下是一个示例代码：

import org.eclipse.paho.client.mqttv3._
import javax.net.ssl._
import java.io.FileInputStream
import java.security.KeyStore

object MqttClientExample extends App {
  val brokerUrl = "ssl://mqtt.example.com:8883"
  val clientId = "mqtt-client"
  val topic = "a"

  val caCertFile = "ca.crt"
  val clientCertFile = "client.crt"
  val clientKeyFile = "client.key"
  val clientKeyPassword = "password"

  val caCert = new FileInputStream(caCertFile)
  val clientCert = new FileInputStream(clientCertFile)
  val clientKey = new FileInputStream(clientKeyFile)

  val keyStore = KeyStore.getInstance("PKCS12")
  keyStore.load(null, null)
  keyStore.setCertificateEntry("caCert", CertificateFactory.getInstance("X.509").generateCertificate(caCert))
  keyStore.setCertificateEntry("clientCert", CertificateFactory.getInstance("X.509").generateCertificate(clientCert))
  keyStore.setKeyEntry("clientKey", clientKey, clientKeyPassword.toCharArray, Array(keyStore.getCertificate("clientCert")))

  val keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm)
  keyManagerFactory.init(keyStore, clientKeyPassword.toCharArray)

  val trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm)
  trustManagerFactory.init(keyStore)

  val sslContext = SSLContext.getInstance("TLS")
  sslContext.init(keyManagerFactory.getKeyManagers, trustManagerFactory.getTrustManagers, null)

  val options = new MqttConnectOptions()
  options.setCleanSession(true)
  options.setSocketFactory(sslContext.getSocketFactory)

  val client = new MqttClient(brokerUrl, clientId)
  client.setCallback(new MqttCallback {
    override def connectionLost(cause: Throwable): Unit = {
      println("Connection lost: " + cause.getMessage)
    }

    override def messageArrived(topic: String, message: MqttMessage): Unit = {
      println("Message received: " + new String(message.getPayload))
    }

    override def deliveryComplete(token: IMqttDeliveryToken): Unit = {
      println("Delivery complete")
    }
  })

  client.connect(options)
  client.subscribe(topic)

  // Wait for messages
  Thread.sleep(5000)

  client.disconnect()
}

在上面的示例中，我们首先指定了MQTT代理的URL和客户端ID。然后，我们使用FileInputStream加载了CA证书、客户端证书和客户端私钥文件。接下来，我们创建了一个KeyStore对象，并将加载的证书和私钥添加到其中。然后，我们使用KeyManagerFactory和TrustManagerFactory初始化了SSL上下文。在MqttConnectOptions中，我们设置了清除会话和使用SSL上下文的Socket工厂。最后，我们创建了一个MqttClient对象，并设置了回调方法。在回调方法中，我们实现了连接丢失、消息到达和传递完成的处理逻辑。然后，我们连接到MQTT代理，订阅主题，并等待一段时间以接收消息。最后，我们断开连接。

请注意，您需要将mqtt.example.com替换为您实际的MQTT代理地址，并将ca.crt、client.crt和client.key替换为您的证书文件路径。另外，如果您的客户端私钥文件有密码保护，请将clientKeyPassword替换为实际的密码。