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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.konnected.internal;
  14
  15 import static org.openhab.binding.konnected.internal.KonnectedBindingConstants.*;
  16
  17 import java.util.Collections;
  18 import java.util.Dictionary;
  19 import java.util.Set;
  20
  21 import javax.servlet.ServletException;
  22
  23 import org.eclipse.jdt.annotation.Nullable;
  24 import org.openhab.binding.konnected.internal.handler.KonnectedHandler;
  25 import org.openhab.binding.konnected.internal.servlet.KonnectedHTTPServlet;
  26 import org.openhab.binding.konnected.internal.servlet.KonnectedWebHookFail;
  27 import org.openhab.core.net.HttpServiceUtil;
  28 import org.openhab.core.net.NetworkAddressService;
  29 import org.openhab.core.thing.Thing;
  30 import org.openhab.core.thing.ThingTypeUID;
  31 import org.openhab.core.thing.binding.BaseThingHandlerFactory;
  32 import org.openhab.core.thing.binding.ThingHandler;
  33 import org.openhab.core.thing.binding.ThingHandlerFactory;
  34 import org.osgi.service.component.ComponentContext;
  35 import org.osgi.service.component.annotations.Component;
  36 import org.osgi.service.component.annotations.Reference;
  37 import org.osgi.service.http.HttpService;
  38 import org.osgi.service.http.NamespaceException;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41
  42 /**
  43  * The {@link KonnectedHandlerFactory} is responsible for creating things and thing
  44  * handlers.
  45  *
  46  * @author Zachary Christiansen - Initial contribution
  47  */
  48 @Component(configurationPid = "binding.konnected", service = ThingHandlerFactory.class)
  49 public class KonnectedHandlerFactory extends BaseThingHandlerFactory {
  50     private final Logger logger = LoggerFactory.getLogger(KonnectedHandlerFactory.class);
  51     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections.singleton(THING_TYPE_MODULE);
  52     private static final String alias = "/" + BINDING_ID;
  53
  54     private HttpService httpService;
  55     private String callbackUrl = null;
  56     private NetworkAddressService networkAddressService;
  57     private KonnectedHTTPServlet servlet;
  58
  59     @Override
  60     public boolean supportsThingType(ThingTypeUID thingTypeUID) {
  61         return SUPPORTED_THING_TYPES_UIDS.contains(thingTypeUID);
  62     }
  63
  64     @Override
  65     protected void activate(ComponentContext componentContext) {
  66         super.activate(componentContext);
  67         Dictionary<String, Object> properties = componentContext.getProperties();
  68         callbackUrl = (String) properties.get("callbackUrl");
  69         try {
  70             this.servlet = registerWebHookServlet();
  71         } catch (KonnectedWebHookFail e) {
  72             logger.error("Failed registering Konnected servlet - binding is not functional!", e);
  73         }
  74     }
  75
  76     @Override
  77     protected void deactivate(ComponentContext componentContext) {
  78         super.deactivate(componentContext);
  79         httpService.unregister(alias);
  80     }
  81
  82     @Override
  83     protected @Nullable ThingHandler createHandler(Thing thing) {
  84         KonnectedHandler thingHandler = new KonnectedHandler(thing, '/' + BINDING_ID, createCallbackUrl(),
  85                 createCallbackPort());
  86         if (servlet != null) {
  87             logger.debug("Adding thinghandler for thing {} to webhook.", thing.getUID().getId());
  88             servlet.add(thingHandler);
  89         }
  90         return thingHandler;
  91     }
  92
  93     /**
  94      * @param thingHandler thing handler to be removed
  95      */
  96     @Override
  97     protected void removeHandler(ThingHandler thingHandler) {
  98         servlet.remove((KonnectedHandler) thingHandler);
  99         thingHandler.dispose();
 100         super.removeHandler(thingHandler);
 101     }
 102
 103     private KonnectedHTTPServlet registerWebHookServlet() throws KonnectedWebHookFail {
 104         KonnectedHTTPServlet servlet = new KonnectedHTTPServlet();
 105         try {
 106             httpService.registerServlet(alias, servlet, null, httpService.createDefaultHttpContext());
 107             return servlet;
 108         } catch (ServletException | NamespaceException e) {
 109             throw new KonnectedWebHookFail("Could not start Konnected Webhook servlet: " + e.getMessage(), e);
 110         }
 111     }
 112
 113     @Reference
 114     public void setHttpService(HttpService httpService) {
 115         this.httpService = httpService;
 116     }
 117
 118     public void unsetHttpService(HttpService httpService) {
 119         this.httpService = null;
 120     }
 121
 122     private String createCallbackUrl() {
 123         if (callbackUrl != null) {
 124             logger.debug("The callback ip address from the OSGI is:{}", callbackUrl);
 125             return callbackUrl;
 126         } else {
 127             final String ipAddress = networkAddressService.getPrimaryIpv4HostAddress();
 128             if (ipAddress == null) {
 129                 logger.warn("No network interface could be found.");
 130                 return null;
 131             }
 132             logger.debug("The callback ip address obtained from the Network Address Service was:{}", ipAddress);
 133             return ipAddress;
 134         }
 135     }
 136
 137     private String createCallbackPort() {
 138         // we do not use SSL as it can cause certificate validation issues.
 139         final int port = HttpServiceUtil.getHttpServicePort(bundleContext);
 140         if (port == -1) {
 141             logger.warn("Cannot find port of the http service.");
 142             return null;
 143         }
 144         logger.debug("the port for the callback is: {}", port);
 145         return Integer.toString(port);
 146     }
 147
 148     @Reference
 149     protected void setNetworkAddressService(NetworkAddressService networkAddressService) {
 150         this.networkAddressService = networkAddressService;
 151     }
 152
 153     protected void unsetNetworkAddressService(NetworkAddressService networkAddressService) {
 154         this.networkAddressService = null;
 155     }
 156 }