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   1 /**
   2  * Copyright (c) 2010-2022 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.netatmo.internal.servlet;
  14
  15 import java.io.IOException;
  16 import java.io.InputStream;
  17 import java.net.URI;
  18 import java.nio.charset.StandardCharsets;
  19 import java.util.ArrayList;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Scanner;
  23 import java.util.concurrent.ConcurrentHashMap;
  24
  25 import javax.servlet.http.HttpServletRequest;
  26 import javax.servlet.http.HttpServletResponse;
  27 import javax.ws.rs.HttpMethod;
  28 import javax.ws.rs.core.MediaType;
  29 import javax.ws.rs.core.UriBuilder;
  30 import javax.ws.rs.core.UriBuilderException;
  31
  32 import org.eclipse.jdt.annotation.NonNullByDefault;
  33 import org.openhab.binding.netatmo.internal.api.NetatmoException;
  34 import org.openhab.binding.netatmo.internal.api.SecurityApi;
  35 import org.openhab.binding.netatmo.internal.api.dto.WebhookEvent;
  36 import org.openhab.binding.netatmo.internal.deserialization.NADeserializer;
  37 import org.openhab.binding.netatmo.internal.handler.ApiBridgeHandler;
  38 import org.openhab.binding.netatmo.internal.handler.capability.EventCapability;
  39 import org.osgi.service.http.HttpService;
  40 import org.slf4j.Logger;
  41 import org.slf4j.LoggerFactory;
  42
  43 /**
  44  * HTTP servlet for Netatmo Webhook.
  45  *
  46  * @author Gaël L'hopital - Initial contribution
  47  */
  48 @NonNullByDefault
  49 public class WebhookServlet extends NetatmoServlet {
  50     private static final long serialVersionUID = -354583910860541214L;
  51
  52     private final Map<String, EventCapability> dataListeners = new ConcurrentHashMap<>();
  53     private final Logger logger = LoggerFactory.getLogger(WebhookServlet.class);
  54     private final SecurityApi securityApi;
  55     private final NADeserializer deserializer;
  56     private final String webHookUrl;
  57
  58     private boolean hookSet = false;
  59
  60     public WebhookServlet(ApiBridgeHandler handler, HttpService httpService, NADeserializer deserializer,
  61             SecurityApi securityApi, String webHookUrl) {
  62         super(handler, httpService, "webhook");
  63         this.deserializer = deserializer;
  64         this.securityApi = securityApi;
  65         this.webHookUrl = webHookUrl;
  66     }
  67
  68     @Override
  69     public void startListening() {
  70         super.startListening();
  71         URI uri = UriBuilder.fromUri(webHookUrl).path(path).build();
  72         try {
  73             logger.info("Setting up WebHook at Netatmo to {}", uri.toString());
  74             hookSet = securityApi.addwebhook(uri);
  75         } catch (UriBuilderException e) {
  76             logger.info("webhookUrl is not a valid URI '{}' : {}", uri, e.getMessage());
  77         } catch (NetatmoException e) {
  78             logger.info("Error setting webhook : {}", e.getMessage());
  79         }
  80     }
  81
  82     @Override
  83     public void dispose() {
  84         if (hookSet) {
  85             logger.info("Releasing WebHook at Netatmo ");
  86             try {
  87                 securityApi.dropWebhook();
  88                 hookSet = false;
  89             } catch (NetatmoException e) {
  90                 logger.warn("Error releasing webhook : {}", e.getMessage());
  91             }
  92         }
  93         super.dispose();
  94     }
  95
  96     @Override
  97     protected void service(HttpServletRequest req, HttpServletResponse resp) throws IOException {
  98         replyQuick(resp);
  99         processEvent(inputStreamToString(req.getInputStream()));
 100     }
 101
 102     private void processEvent(String data) throws IOException {
 103         if (!data.isEmpty()) {
 104             logger.debug("Event transmitted from restService : {}", data);
 105             try {
 106                 WebhookEvent event = deserializer.deserialize(WebhookEvent.class, data);
 107                 List<String> toBeNotified = new ArrayList<>();
 108                 toBeNotified.add(event.getCameraId());
 109                 toBeNotified.addAll(event.getPersons().keySet());
 110                 notifyListeners(toBeNotified, event);
 111             } catch (NetatmoException e) {
 112                 logger.debug("Error deserializing webhook data received : {}. {}", data, e.getMessage());
 113             }
 114         }
 115     }
 116
 117     private void replyQuick(HttpServletResponse resp) throws IOException {
 118         resp.setCharacterEncoding(StandardCharsets.UTF_8.name());
 119         resp.setContentType(MediaType.APPLICATION_JSON);
 120         resp.setHeader("Access-Control-Allow-Origin", "*");
 121         resp.setHeader("Access-Control-Allow-Methods", HttpMethod.POST);
 122         resp.setIntHeader("Access-Control-Max-Age", 3600);
 123         resp.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
 124         resp.getWriter().write("");
 125     }
 126
 127     private String inputStreamToString(InputStream is) throws IOException {
 128         String value = "";
 129         try (Scanner scanner = new Scanner(is)) {
 130             scanner.useDelimiter("\\A");
 131             value = scanner.hasNext() ? scanner.next() : "";
 132         }
 133         return value;
 134     }
 135
 136     private void notifyListeners(List<String> tobeNotified, WebhookEvent event) {
 137         tobeNotified.forEach(id -> {
 138             EventCapability module = dataListeners.get(id);
 139             if (module != null) {
 140                 module.setNewData(event);
 141             }
 142         });
 143     }
 144
 145     public void registerDataListener(String id, EventCapability eventCapability) {
 146         dataListeners.put(id, eventCapability);
 147     }
 148
 149     public void unregisterDataListener(String id) {
 150         dataListeners.remove(id);
 151     }
 152 }