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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.systeminfo.internal.discovery;
  14
  15 import static org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants.THING_TYPE_COMPUTER;
  16
  17 import java.net.InetAddress;
  18 import java.net.UnknownHostException;
  19 import java.util.Set;
  20
  21 import org.eclipse.jdt.annotation.NonNullByDefault;
  22 import org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants;
  23 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  24 import org.openhab.core.config.discovery.DiscoveryResult;
  25 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  26 import org.openhab.core.config.discovery.DiscoveryService;
  27 import org.openhab.core.thing.ThingTypeUID;
  28 import org.openhab.core.thing.ThingUID;
  29 import org.osgi.service.component.annotations.Component;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 /**
  34  * Discovery service implementation for the Systeminfo binding. It creates {@link DiscoveryResult} with
  35  * {@link #DEFAULT_THING_LABEL}. The discovered Thing will have id - the hostname or {@link #DEFAULT_THING_ID}'
  36  *
  37  * @author Svilen Valkanov - Initial contribution
  38  * @author Wouter Born - Add null annotations
  39  */
  40 @NonNullByDefault
  41 @Component(service = DiscoveryService.class, configurationPid = "discovery.systeminfo")
  42 public class SysteminfoDiscoveryService extends AbstractDiscoveryService {
  43     public static final String DEFAULT_THING_ID = "unknown";
  44     public static final String DEFAULT_THING_LABEL = "Local computer";
  45
  46     private final Logger logger = LoggerFactory.getLogger(SysteminfoDiscoveryService.class);
  47
  48     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Set.of(THING_TYPE_COMPUTER);
  49
  50     private static final int DISCOVERY_TIME_SECONDS = 30;
  51     private static final String THING_UID_VALID_CHARS = "A-Za-z0-9_-";
  52     private static final String HOST_NAME_SEPERATOR = "_";
  53
  54     public SysteminfoDiscoveryService() {
  55         super(SUPPORTED_THING_TYPES_UIDS, DISCOVERY_TIME_SECONDS);
  56     }
  57
  58     @Override
  59     protected void startScan() {
  60         logger.debug("Starting system information discovery !");
  61         String hostname;
  62
  63         try {
  64             hostname = getHostName();
  65             if (hostname.isEmpty()) {
  66                 throw new UnknownHostException();
  67             }
  68             if (!hostname.matches("[" + THING_UID_VALID_CHARS + "]*")) {
  69                 hostname = hostname.replaceAll("[^" + THING_UID_VALID_CHARS + "]", HOST_NAME_SEPERATOR);
  70             }
  71         } catch (UnknownHostException ex) {
  72             hostname = DEFAULT_THING_ID;
  73             logger.info("Hostname can not be resolved. Computer name will be set to the default one: {}",
  74                     DEFAULT_THING_ID);
  75         }
  76
  77         ThingTypeUID computerType = SysteminfoBindingConstants.THING_TYPE_COMPUTER;
  78         ThingUID computer = new ThingUID(computerType, hostname);
  79         thingDiscovered(DiscoveryResultBuilder.create(computer).withLabel(DEFAULT_THING_LABEL).build());
  80     }
  81
  82     protected String getHostName() throws UnknownHostException {
  83         InetAddress addr = InetAddress.getLocalHost();
  84         return addr.getHostName();
  85     }
  86 }