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   1 /**
   2  * Copyright (c) 2010-2021 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.ipp.internal.discovery;
  14
  15 import java.net.InetAddress;
  16 import java.util.Collections;
  17 import java.util.HashMap;
  18 import java.util.Map;
  19 import java.util.Set;
  20
  21 import javax.jmdns.ServiceInfo;
  22
  23 import org.openhab.binding.ipp.internal.IppBindingConstants;
  24 import org.openhab.core.config.discovery.DiscoveryResult;
  25 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  26 import org.openhab.core.config.discovery.mdns.MDNSDiscoveryParticipant;
  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  * discovers ipp printers announced by mDNS
  35  *
  36  * @author Tobias Bräutigam - Initial contribution
  37  */
  38 @Component
  39 public class IppPrinterDiscoveryParticipant implements MDNSDiscoveryParticipant {
  40
  41     private final Logger logger = LoggerFactory.getLogger(IppPrinterDiscoveryParticipant.class);
  42
  43     @Override
  44     public Set<ThingTypeUID> getSupportedThingTypeUIDs() {
  45         return Collections.singleton(IppBindingConstants.PRINTER_THING_TYPE);
  46     }
  47
  48     @Override
  49     public String getServiceType() {
  50         return "_ipp._tcp.local.";
  51     }
  52
  53     @Override
  54     public ThingUID getThingUID(ServiceInfo service) {
  55         if (service != null) {
  56             logger.trace("ServiceInfo: {}", service);
  57             if (service.getType() != null) {
  58                 if (service.getType().equals(getServiceType())) {
  59                     String uidName = getUIDName(service);
  60                     return new ThingUID(IppBindingConstants.PRINTER_THING_TYPE, uidName);
  61                 }
  62             }
  63         }
  64         return null;
  65     }
  66
  67     private String getUIDName(ServiceInfo service) {
  68         return service.getName().replaceAll("[^A-Za-z0-9_]", "_");
  69     }
  70
  71     private InetAddress getIpAddress(ServiceInfo service) {
  72         InetAddress address = null;
  73         for (InetAddress addr : service.getInet4Addresses()) {
  74             return addr;
  75         }
  76         // Fallback for Inet6addresses
  77         for (InetAddress addr : service.getInet6Addresses()) {
  78             return addr;
  79         }
  80         return address;
  81     }
  82
  83     @Override
  84     public DiscoveryResult createResult(ServiceInfo service) {
  85         DiscoveryResult result = null;
  86         String rp = service.getPropertyString("rp");
  87         if (rp == null) {
  88             return null;
  89         }
  90         ThingUID uid = getThingUID(service);
  91         if (uid != null) {
  92             Map<String, Object> properties = new HashMap<>(2);
  93             // remove the domain from the name
  94             InetAddress ip = getIpAddress(service);
  95             if (ip == null) {
  96                 return null;
  97             }
  98             String inetAddress = ip.toString().substring(1); // trim leading slash
  99
 100             String label = service.getName();
 101
 102             int port = service.getPort();
 103
 104             properties.put(IppBindingConstants.PRINTER_PARAMETER_URL, "http://" + inetAddress + ":" + port + "/" + rp);
 105             properties.put(IppBindingConstants.PRINTER_PARAMETER_NAME, label);
 106
 107             result = DiscoveryResultBuilder.create(uid).withProperties(properties).withLabel(label).build();
 108             logger.debug("Created a DiscoveryResult {} for ipp printer on host '{}' name '{}'", result,
 109                     properties.get(IppBindingConstants.PRINTER_PARAMETER_URL), label);
 110         }
 111         return result;
 112     }
 113 }