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   1 /**
   2  * Copyright (c) 2010-2020 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.hpprinter.internal;
  14
  15 import static org.openhab.binding.hpprinter.internal.HPPrinterBindingConstants.THING_PRINTER;
  16
  17 import java.net.InetAddress;
  18 import java.util.HashMap;
  19 import java.util.Map;
  20 import java.util.Set;
  21
  22 import javax.jmdns.ServiceInfo;
  23
  24 import org.eclipse.jdt.annotation.NonNullByDefault;
  25 import org.eclipse.jdt.annotation.Nullable;
  26 import org.openhab.core.config.discovery.DiscoveryResult;
  27 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  28 import org.openhab.core.config.discovery.mdns.MDNSDiscoveryParticipant;
  29 import org.openhab.core.thing.ThingTypeUID;
  30 import org.openhab.core.thing.ThingUID;
  31 import org.osgi.service.component.annotations.Component;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 /**
  36  * The {@link HPPrinterDiscoveryParticipant} class discovers HP Printers over
  37  * mDNS.
  38  *
  39  * @author Stewart Cossey - Initial contribution
  40  */
  41 @NonNullByDefault
  42 @Component
  43 public class HPPrinterDiscoveryParticipant implements MDNSDiscoveryParticipant {
  44
  45     private final Logger logger = LoggerFactory.getLogger(HPPrinterDiscoveryParticipant.class);
  46
  47     @Override
  48     public @Nullable DiscoveryResult createResult(ServiceInfo service) {
  49         if (!service.hasData()) {
  50             logger.trace("Service has no data.");
  51             return null;
  52         }
  53
  54         // We only care about HP Printers
  55         String ty = service.getPropertyString("ty");
  56         if (ty != null && ty.toLowerCase().startsWith("hp")) {
  57             String rp = service.getPropertyString("rp");
  58             if (rp == null) {
  59                 return null;
  60             }
  61
  62             logger.debug("Found HP Printer ID: {}", ty);
  63             ThingUID uid = getThingUID(service);
  64             if (uid != null) {
  65                 Map<String, Object> properties = new HashMap<>(2);
  66                 InetAddress ip = getIpAddress(service);
  67                 if (ip == null) {
  68                     return null;
  69                 }
  70                 String inetAddress = ip.toString().substring(1); // trim leading slash
  71                 String label = service.getName();
  72
  73                 properties.put(HPPrinterConfiguration.IP_ADDRESS, inetAddress);
  74                 DiscoveryResult result = DiscoveryResultBuilder.create(uid).withProperties(properties).withLabel(label)
  75                         .build();
  76                 logger.trace("Created a DiscoveryResult {} for printer on host '{}' name '{}'", result, inetAddress,
  77                         label);
  78                 return result;
  79             } else {
  80                 logger.debug("Found unsupported HP Printer ID: {}", ty);
  81             }
  82         } else {
  83             logger.trace("Ignore non HP device {}", ty);
  84         }
  85
  86         return null;
  87     }
  88
  89     private String getUIDName(ServiceInfo service) {
  90         return service.getName().replaceAll("[^A-Za-z0-9_]", "_");
  91     }
  92
  93     @Override
  94     public String getServiceType() {
  95         return "_printer._tcp.local.";
  96     }
  97
  98     @Override
  99     public Set<ThingTypeUID> getSupportedThingTypeUIDs() {
 100         return HPPrinterBindingConstants.SUPPORTED_THING_TYPES_UIDS;
 101     }
 102
 103     @Override
 104     public @Nullable ThingUID getThingUID(ServiceInfo service) {
 105         if (service.getType() != null) {
 106             logger.trace("ServiceInfo: {}", service);
 107             if (service.getType().equals(getServiceType())) {
 108                 String uidName = getUIDName(service);
 109                 ThingTypeUID mdl = findThingType();
 110
 111                 return new ThingUID(mdl, uidName);
 112             }
 113         }
 114         return null;
 115     }
 116
 117     @Nullable
 118     private InetAddress getIpAddress(ServiceInfo service) {
 119         InetAddress address = null;
 120         for (InetAddress addr : service.getInet4Addresses()) {
 121             logger.debug("Get IP address for device {}", addr);
 122             return addr;
 123         }
 124         // Fallback for Inet6addresses
 125         for (InetAddress addr : service.getInet6Addresses()) {
 126             logger.debug("Get IP address for device {}", addr);
 127             return addr;
 128         }
 129         return address;
 130     }
 131
 132     private ThingTypeUID findThingType() {
 133         return THING_PRINTER;
 134     }
 135 }