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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.zoneminder.internal.handler;
  14
  15 import static org.openhab.binding.zoneminder.internal.ZmBindingConstants.*;
  16
  17 import java.io.ByteArrayInputStream;
  18 import java.io.IOException;
  19 import java.nio.charset.StandardCharsets;
  20 import java.util.ArrayList;
  21 import java.util.Collection;
  22 import java.util.Collections;
  23 import java.util.List;
  24 import java.util.Map;
  25 import java.util.Set;
  26 import java.util.concurrent.ConcurrentHashMap;
  27 import java.util.concurrent.ExecutionException;
  28 import java.util.concurrent.Future;
  29 import java.util.concurrent.TimeUnit;
  30 import java.util.concurrent.TimeoutException;
  31
  32 import org.eclipse.jdt.annotation.NonNullByDefault;
  33 import org.eclipse.jdt.annotation.Nullable;
  34 import org.eclipse.jetty.client.HttpClient;
  35 import org.eclipse.jetty.client.api.ContentResponse;
  36 import org.eclipse.jetty.client.api.Request;
  37 import org.eclipse.jetty.http.HttpHeader;
  38 import org.eclipse.jetty.http.HttpMethod;
  39 import org.eclipse.jetty.http.HttpStatus;
  40 import org.openhab.binding.zoneminder.internal.ZmStateDescriptionOptionsProvider;
  41 import org.openhab.binding.zoneminder.internal.config.ZmBridgeConfig;
  42 import org.openhab.binding.zoneminder.internal.discovery.MonitorDiscoveryService;
  43 import org.openhab.binding.zoneminder.internal.dto.EventDTO;
  44 import org.openhab.binding.zoneminder.internal.dto.EventsDTO;
  45 import org.openhab.binding.zoneminder.internal.dto.MonitorDTO;
  46 import org.openhab.binding.zoneminder.internal.dto.MonitorItemDTO;
  47 import org.openhab.binding.zoneminder.internal.dto.MonitorStateDTO;
  48 import org.openhab.binding.zoneminder.internal.dto.MonitorStatusDTO;
  49 import org.openhab.binding.zoneminder.internal.dto.MonitorsDTO;
  50 import org.openhab.binding.zoneminder.internal.dto.VersionDTO;
  51 import org.openhab.core.io.net.http.HttpUtil;
  52 import org.openhab.core.library.types.OnOffType;
  53 import org.openhab.core.library.types.RawType;
  54 import org.openhab.core.library.types.StringType;
  55 import org.openhab.core.thing.Bridge;
  56 import org.openhab.core.thing.ChannelUID;
  57 import org.openhab.core.thing.Thing;
  58 import org.openhab.core.thing.ThingStatus;
  59 import org.openhab.core.thing.ThingStatusDetail;
  60 import org.openhab.core.thing.binding.BaseBridgeHandler;
  61 import org.openhab.core.thing.binding.ThingHandler;
  62 import org.openhab.core.thing.binding.ThingHandlerService;
  63 import org.openhab.core.types.Command;
  64 import org.openhab.core.types.RefreshType;
  65 import org.openhab.core.types.StateOption;
  66 import org.openhab.core.types.UnDefType;
  67 import org.slf4j.Logger;
  68 import org.slf4j.LoggerFactory;
  69
  70 import com.google.gson.Gson;
  71 import com.google.gson.GsonBuilder;
  72 import com.google.gson.JsonSyntaxException;
  73
  74 /**
  75  * The {@link ZmBridgeHandler} represents the Zoneminder server. It handles all communication
  76  * with the Zoneminder server.
  77  *
  78  * @author Mark Hilbush - Initial contribution
  79  */
  80 @NonNullByDefault
  81 public class ZmBridgeHandler extends BaseBridgeHandler {
  82
  83     private static final int MONITOR_REFRESH_INTERVAL_SECONDS = 10;
  84     private static final int MONITOR_REFRESH_STARTUP_DELAY_SECONDS = 5;
  85
  86     private static final int API_TIMEOUT_MSEC = 10000;
  87
  88     private static final String LOGIN_PATH = "/api/host/login.json";
  89
  90     private static final String STREAM_IMAGE = "single";
  91     private static final String STREAM_VIDEO = "jpeg";
  92
  93     private static final List<String> EMPTY_LIST = Collections.emptyList();
  94
  95     private static final Gson GSON = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
  96
  97     private final Logger logger = LoggerFactory.getLogger(ZmBridgeHandler.class);
  98
  99     private @Nullable Future<?> refreshMonitorsJob;
 100
 101     private List<Monitor> savedMonitors = new ArrayList<>();
 102
 103     private String host = "";
 104     private boolean useSSL;
 105     private @Nullable String portNumber;
 106     private String urlPath = DEFAULT_URL_PATH;
 107     private int monitorRefreshInterval;
 108     private boolean backgroundDiscoveryEnabled;
 109     private int defaultAlarmDuration;
 110     private @Nullable Integer defaultImageRefreshInterval;
 111
 112     private final HttpClient httpClient;
 113     private final ZmStateDescriptionOptionsProvider stateDescriptionProvider;
 114
 115     private ZmAuth zmAuth;
 116
 117     // Maintain mapping of handler and monitor id
 118     private final Map<String, ZmMonitorHandler> monitorHandlers = new ConcurrentHashMap<>();
 119
 120     public ZmBridgeHandler(Bridge thing, HttpClient httpClient,
 121             ZmStateDescriptionOptionsProvider stateDescriptionProvider) {
 122         super(thing);
 123         this.httpClient = httpClient;
 124         this.stateDescriptionProvider = stateDescriptionProvider;
 125         // Default to use no authentication
 126         zmAuth = new ZmAuth(this);
 127     }
 128
 129     @Override
 130     public void initialize() {
 131         ZmBridgeConfig config = getConfigAs(ZmBridgeConfig.class);
 132
 133         Integer value;
 134         value = config.refreshInterval;
 135         monitorRefreshInterval = value == null ? MONITOR_REFRESH_INTERVAL_SECONDS : value;
 136
 137         value = config.defaultAlarmDuration;
 138         defaultAlarmDuration = value == null ? DEFAULT_ALARM_DURATION_SECONDS : value;
 139
 140         defaultImageRefreshInterval = config.defaultImageRefreshInterval;
 141
 142         backgroundDiscoveryEnabled = config.discoveryEnabled;
 143         logger.debug("Bridge: Background discovery is {}", backgroundDiscoveryEnabled == true ? "ENABLED" : "DISABLED");
 144
 145         host = config.host;
 146         useSSL = config.useSSL.booleanValue();
 147         portNumber = config.portNumber != null ? Integer.toString(config.portNumber) : null;
 148         urlPath = config.urlPath;
 149
 150         // If user and password are configured, then use Zoneminder authentication
 151         if (config.user != null && config.pass != null) {
 152             zmAuth = new ZmAuth(this, config.user, config.pass);
 153         }
 154         if (isHostValid()) {
 155             updateStatus(ThingStatus.ONLINE);
 156             scheduleRefreshJob();
 157         }
 158     }
 159
 160     @Override
 161     public void dispose() {
 162         cancelRefreshJob();
 163     }
 164
 165     @Override
 166     public void childHandlerInitialized(ThingHandler childHandler, Thing childThing) {
 167         String monitorId = (String) childThing.getConfiguration().get(CONFIG_MONITOR_ID);
 168         monitorHandlers.put(monitorId, (ZmMonitorHandler) childHandler);
 169         logger.debug("Bridge: Monitor handler was initialized for {} with id {}", childThing.getUID(), monitorId);
 170     }
 171
 172     @Override
 173     public void childHandlerDisposed(ThingHandler childHandler, Thing childThing) {
 174         String monitorId = (String) childThing.getConfiguration().get(CONFIG_MONITOR_ID);
 175         monitorHandlers.remove(monitorId);
 176         logger.debug("Bridge: Monitor handler was disposed for {} with id {}", childThing.getUID(), monitorId);
 177     }
 178
 179     @Override
 180     public void handleCommand(ChannelUID channelUID, Command command) {
 181         switch (channelUID.getId()) {
 182             case CHANNEL_IMAGE_MONITOR_ID:
 183                 handleMonitorIdCommand(command, CHANNEL_IMAGE_MONITOR_ID, CHANNEL_IMAGE_URL, STREAM_IMAGE);
 184                 break;
 185             case CHANNEL_VIDEO_MONITOR_ID:
 186                 handleMonitorIdCommand(command, CHANNEL_VIDEO_MONITOR_ID, CHANNEL_VIDEO_URL, STREAM_VIDEO);
 187                 break;
 188         }
 189     }
 190
 191     private void handleMonitorIdCommand(Command command, String monitorIdChannelId, String urlChannelId, String type) {
 192         if (command instanceof RefreshType || command == OnOffType.OFF) {
 193             updateState(monitorIdChannelId, UnDefType.UNDEF);
 194             updateState(urlChannelId, UnDefType.UNDEF);
 195         } else if (command instanceof StringType) {
 196             String id = command.toString();
 197             if (isMonitorIdValid(id)) {
 198                 updateState(urlChannelId, new StringType(buildStreamUrl(id, type)));
 199             } else {
 200                 updateState(monitorIdChannelId, UnDefType.UNDEF);
 201                 updateState(urlChannelId, UnDefType.UNDEF);
 202             }
 203         }
 204     }
 205
 206     @Override
 207     public Collection<Class<? extends ThingHandlerService>> getServices() {
 208         return Collections.singleton(MonitorDiscoveryService.class);
 209     }
 210
 211     public boolean isBackgroundDiscoveryEnabled() {
 212         return backgroundDiscoveryEnabled;
 213     }
 214
 215     public Integer getDefaultAlarmDuration() {
 216         return defaultAlarmDuration;
 217     }
 218
 219     public @Nullable Integer getDefaultImageRefreshInterval() {
 220         return defaultImageRefreshInterval;
 221     }
 222
 223     public List<Monitor> getSavedMonitors() {
 224         return savedMonitors;
 225     }
 226
 227     public Gson getGson() {
 228         return GSON;
 229     }
 230
 231     public void setFunction(String id, MonitorFunction function) {
 232         if (!zmAuth.isAuthorized()) {
 233             return;
 234         }
 235         logger.debug("Bridge: Setting monitor {} function to {}", id, function);
 236         executePost(buildUrl(String.format("/api/monitors/%s.json", id)),
 237                 String.format("Monitor[Function]=%s", function.toString()));
 238     }
 239
 240     public void setEnabled(String id, OnOffType enabled) {
 241         if (!zmAuth.isAuthorized()) {
 242             return;
 243         }
 244         logger.debug("Bridge: Setting monitor {} to {}", id, enabled);
 245         executePost(buildUrl(String.format("/api/monitors/%s.json", id)),
 246                 String.format("Monitor[Enabled]=%s", enabled == OnOffType.ON ? "1" : "0"));
 247     }
 248
 249     public void setAlarmOn(String id) {
 250         if (!zmAuth.isAuthorized()) {
 251             return;
 252         }
 253         logger.debug("Bridge: Turning alarm ON for monitor {}", id);
 254         setAlarm(buildUrl(String.format("/api/monitors/alarm/id:%s/command:on.json", id)));
 255     }
 256
 257     public void setAlarmOff(String id) {
 258         if (!zmAuth.isAuthorized()) {
 259             return;
 260         }
 261         logger.debug("Bridge: Turning alarm OFF for monitor {}", id);
 262         setAlarm(buildUrl(String.format("/api/monitors/alarm/id:%s/command:off.json", id)));
 263     }
 264
 265     public @Nullable RawType getImage(String id, @Nullable Integer imageRefreshIntervalSeconds) {
 266         Integer localRefreshInterval = imageRefreshIntervalSeconds;
 267         if (localRefreshInterval == null || localRefreshInterval.intValue() < 1 || !zmAuth.isAuthorized()) {
 268             return null;
 269         }
 270         // Call should timeout just before the refresh interval
 271         int timeout = Math.min((localRefreshInterval * 1000) - 500, API_TIMEOUT_MSEC);
 272         Request request = httpClient.newRequest(buildStreamUrl(id, STREAM_IMAGE));
 273         request.method(HttpMethod.GET);
 274         request.timeout(timeout, TimeUnit.MILLISECONDS);
 275
 276         String errorMsg;
 277         try {
 278             ContentResponse response = request.send();
 279             if (response.getStatus() == HttpStatus.OK_200) {
 280                 RawType image = new RawType(response.getContent(), response.getHeaders().get(HttpHeader.CONTENT_TYPE));
 281                 return image;
 282             } else {
 283                 errorMsg = String.format("HTTP GET failed: %d, %s", response.getStatus(), response.getReason());
 284             }
 285         } catch (TimeoutException e) {
 286             errorMsg = String.format("TimeoutException: Call to Zoneminder API timed out after {} msec", timeout);
 287         } catch (ExecutionException e) {
 288             errorMsg = String.format("ExecutionException: %s", e.getMessage());
 289         } catch (InterruptedException e) {
 290             errorMsg = String.format("InterruptedException: %s", e.getMessage());
 291             Thread.currentThread().interrupt();
 292         }
 293         logger.debug("{}", errorMsg);
 294         return null;
 295     }
 296
 297     @SuppressWarnings("null")
 298     private synchronized List<Monitor> getMonitors() {
 299         List<Monitor> monitorList = new ArrayList<>();
 300         if (!zmAuth.isAuthorized()) {
 301             return monitorList;
 302         }
 303         try {
 304             String response = executeGet(buildUrl("/api/monitors.json"));
 305             MonitorsDTO monitors = GSON.fromJson(response, MonitorsDTO.class);
 306             if (monitors != null && monitors.monitorItems != null) {
 307                 List<StateOption> options = new ArrayList<>();
 308                 for (MonitorItemDTO monitorItem : monitors.monitorItems) {
 309                     MonitorDTO m = monitorItem.monitor;
 310                     MonitorStatusDTO mStatus = monitorItem.monitorStatus;
 311                     if (m != null && mStatus != null) {
 312                         Monitor monitor = new Monitor(m.id, m.name, m.function, m.enabled, mStatus.status);
 313                         monitor.setHourEvents(m.hourEvents);
 314                         monitor.setDayEvents(m.dayEvents);
 315                         monitor.setWeekEvents(m.weekEvents);
 316                         monitor.setMonthEvents(m.monthEvents);
 317                         monitor.setTotalEvents(m.totalEvents);
 318                         monitor.setImageUrl(buildStreamUrl(m.id, STREAM_IMAGE));
 319                         monitor.setVideoUrl(buildStreamUrl(m.id, STREAM_VIDEO));
 320                         monitorList.add(monitor);
 321                         options.add(new StateOption(m.id, "Monitor " + m.id));
 322                     }
 323                     stateDescriptionProvider
 324                             .setStateOptions(new ChannelUID(getThing().getUID(), CHANNEL_IMAGE_MONITOR_ID), options);
 325                     stateDescriptionProvider
 326                             .setStateOptions(new ChannelUID(getThing().getUID(), CHANNEL_VIDEO_MONITOR_ID), options);
 327                 }
 328                 // Only update alarm and event info for monitors whose handlers are initialized
 329                 Set<String> ids = monitorHandlers.keySet();
 330                 for (Monitor m : monitorList) {
 331                     if (ids.contains(m.getId())) {
 332                         m.setState(getState(m.getId()));
 333                         m.setLastEvent(getLastEvent(m.getId()));
 334                     }
 335                 }
 336             }
 337         } catch (JsonSyntaxException e) {
 338             logger.debug("Bridge: JsonSyntaxException: {}", e.getMessage(), e);
 339         }
 340         return monitorList;
 341     }
 342
 343     @SuppressWarnings("null")
 344     private @Nullable Event getLastEvent(String id) {
 345         if (!zmAuth.isAuthorized()) {
 346             return null;
 347         }
 348         try {
 349             List<String> parameters = new ArrayList<>();
 350             parameters.add("sort=StartTime");
 351             parameters.add("direction=desc");
 352             parameters.add("limit=1");
 353             String response = executeGet(buildUrlWithParameters(
 354                     String.format("/api/events/index/MonitorId:%s/Name!=:New%%20Event.json", id), parameters));
 355             EventsDTO events = GSON.fromJson(response, EventsDTO.class);
 356             if (events != null && events.eventsList != null && events.eventsList.size() == 1) {
 357                 EventDTO e = events.eventsList.get(0).event;
 358                 Event event = new Event(e.eventId, e.name, e.cause, e.notes, e.startTime, e.endTime);
 359                 event.setFrames(e.frames);
 360                 event.setAlarmFrames(e.alarmFrames);
 361                 event.setLength(e.length);
 362                 return event;
 363             }
 364         } catch (JsonSyntaxException e) {
 365             logger.debug("Bridge: JsonSyntaxException: {}", e.getMessage(), e);
 366         }
 367         return null;
 368     }
 369
 370     private @Nullable VersionDTO getVersion() {
 371         if (!zmAuth.isAuthorized()) {
 372             return null;
 373         }
 374         VersionDTO version = null;
 375         try {
 376             String response = executeGet(buildUrl("/api/host/getVersion.json"));
 377             version = GSON.fromJson(response, VersionDTO.class);
 378         } catch (JsonSyntaxException e) {
 379             logger.debug("Bridge: JsonSyntaxException: {}", e.getMessage(), e);
 380         }
 381         return version;
 382     }
 383
 384     private void setAlarm(String url) {
 385         executeGet(url);
 386     }
 387
 388     @SuppressWarnings("null")
 389     private MonitorState getState(String id) {
 390         if (!zmAuth.isAuthorized()) {
 391             return MonitorState.UNKNOWN;
 392         }
 393         try {
 394             String response = executeGet(buildUrl(String.format("/api/monitors/alarm/id:%s/command:status.json", id)));
 395             MonitorStateDTO monitorState = GSON.fromJson(response, MonitorStateDTO.class);
 396             if (monitorState != null) {
 397                 MonitorState state = monitorState.state;
 398                 return state != null ? state : MonitorState.UNKNOWN;
 399             }
 400         } catch (JsonSyntaxException e) {
 401             logger.debug("Bridge: JsonSyntaxException: {}", e.getMessage(), e);
 402         }
 403         return MonitorState.UNKNOWN;
 404     }
 405
 406     public @Nullable String executeGet(String url) {
 407         try {
 408             long startTime = System.currentTimeMillis();
 409             String response = HttpUtil.executeUrl("GET", url, API_TIMEOUT_MSEC);
 410             logger.trace("Bridge: Http GET of '{}' returned '{}' in {} ms", url, response,
 411                     System.currentTimeMillis() - startTime);
 412             return response;
 413         } catch (IOException e) {
 414             logger.debug("Bridge: IOException on GET request, url='{}': {}", url, e.getMessage());
 415         }
 416         return null;
 417     }
 418
 419     private @Nullable String executePost(String url, String content) {
 420         return executePost(url, content, "application/x-www-form-urlencoded");
 421     }
 422
 423     public @Nullable String executePost(String url, String content, String contentType) {
 424         try (ByteArrayInputStream inputStream = new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8))) {
 425             long startTime = System.currentTimeMillis();
 426             String response = HttpUtil.executeUrl("POST", url, inputStream, contentType, API_TIMEOUT_MSEC);
 427             logger.trace("Bridge: Http POST content '{}' to '{}' returned: {} in {} ms", content, url, response,
 428                     System.currentTimeMillis() - startTime);
 429             return response;
 430         } catch (IOException e) {
 431             logger.debug("Bridge: IOException on POST request, url='{}': {}", url, e.getMessage());
 432         }
 433         return null;
 434     }
 435
 436     public String buildLoginUrl() {
 437         return buildBaseUrl(LOGIN_PATH).toString();
 438     }
 439
 440     public String buildLoginUrl(String tokenParameter) {
 441         StringBuilder sb = buildBaseUrl(LOGIN_PATH);
 442         sb.append(tokenParameter);
 443         return sb.toString();
 444     }
 445
 446     private String buildStreamUrl(String id, String streamType) {
 447         List<String> parameters = new ArrayList<>();
 448         parameters.add(String.format("mode=%s", streamType));
 449         parameters.add(String.format("monitor=%s", id));
 450         return buildUrlWithParameters("/cgi-bin/zms", parameters);
 451     }
 452
 453     private String buildUrl(String path) {
 454         return buildUrlWithParameters(path, EMPTY_LIST);
 455     }
 456
 457     private String buildUrlWithParameters(String path, List<String> parameters) {
 458         StringBuilder sb = buildBaseUrl(path);
 459         String joiner = "?";
 460         for (String parameter : parameters) {
 461             sb.append(joiner).append(parameter);
 462             joiner = "&";
 463         }
 464         if (zmAuth.usingAuthorization()) {
 465             sb.append(joiner).append("token=").append(zmAuth.getAccessToken());
 466         }
 467         return sb.toString();
 468     }
 469
 470     private StringBuilder buildBaseUrl(String path) {
 471         StringBuilder sb = new StringBuilder();
 472         sb.append(useSSL ? "https://" : "http://");
 473         sb.append(host);
 474         if (portNumber != null) {
 475             sb.append(":").append(portNumber);
 476         }
 477         sb.append(urlPath);
 478         sb.append(path);
 479         return sb;
 480     }
 481
 482     private boolean isMonitorIdValid(String id) {
 483         return savedMonitors.stream().filter(monitor -> id.equals(monitor.getId())).findAny().isPresent();
 484     }
 485
 486     private boolean isHostValid() {
 487         logger.debug("Bridge: Checking for valid Zoneminder host: {}", host);
 488         VersionDTO version = getVersion();
 489         if (version != null) {
 490             if (checkSoftwareVersion(version.version) && checkApiVersion(version.apiVersion)) {
 491                 return true;
 492             }
 493         } else {
 494             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "Can't get version information");
 495         }
 496         return false;
 497     }
 498
 499     private boolean checkSoftwareVersion(@Nullable String softwareVersion) {
 500         logger.debug("Bridge: Zoneminder software version is {}", softwareVersion);
 501         if (softwareVersion != null) {
 502             String[] versionParts = softwareVersion.split("\\.");
 503             if (versionParts.length >= 2) {
 504                 try {
 505                     int versionMajor = Integer.parseInt(versionParts[0]);
 506                     int versionMinor = Integer.parseInt(versionParts[1]);
 507                     if (versionMajor == 1 && versionMinor >= 34) {
 508                         logger.debug("Bridge: Zoneminder software version check OK");
 509                         return true;
 510                     } else {
 511                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, String
 512                                 .format("Current Zoneminder version: %s. Requires version >= 1.34.0", softwareVersion));
 513                     }
 514                 } catch (NumberFormatException e) {
 515                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 516                             String.format("Badly formatted version number: %s", softwareVersion));
 517                 }
 518             } else {
 519                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 520                         String.format("Can't parse software version: %s", softwareVersion));
 521             }
 522         } else {
 523             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "Software version is null");
 524         }
 525         return false;
 526     }
 527
 528     private boolean checkApiVersion(@Nullable String apiVersion) {
 529         logger.debug("Bridge: Zoneminder API version is {}", apiVersion);
 530         if (apiVersion != null) {
 531             String[] versionParts = apiVersion.split("\\.");
 532             if (versionParts.length >= 2) {
 533                 try {
 534                     int versionMajor = Integer.parseInt(versionParts[0]);
 535                     if (versionMajor >= 2) {
 536                         logger.debug("Bridge: Zoneminder API version check OK");
 537                         return true;
 538                     } else {
 539                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, String
 540                                 .format("Requires API version >= 2.0. This Zoneminder is API version {}", apiVersion));
 541                     }
 542                 } catch (NumberFormatException e) {
 543                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 544                             String.format("Badly formatted API version: %s", apiVersion));
 545                 }
 546             } else {
 547                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 548                         String.format("Can't parse API version: %s", apiVersion));
 549             }
 550         } else {
 551             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "API version is null");
 552         }
 553         return false;
 554     }
 555
 556     @SuppressWarnings("null")
 557     private void refreshMonitors() {
 558         List<Monitor> monitors = getMonitors();
 559         savedMonitors = monitors;
 560         for (Monitor monitor : monitors) {
 561             ZmMonitorHandler handler = monitorHandlers.get(monitor.getId());
 562             if (handler != null) {
 563                 handler.updateStatus(monitor);
 564             }
 565         }
 566     }
 567
 568     private void scheduleRefreshJob() {
 569         logger.debug("Bridge: Scheduling monitors refresh job");
 570         cancelRefreshJob();
 571         refreshMonitorsJob = scheduler.scheduleWithFixedDelay(this::refreshMonitors,
 572                 MONITOR_REFRESH_STARTUP_DELAY_SECONDS, monitorRefreshInterval, TimeUnit.SECONDS);
 573     }
 574
 575     private void cancelRefreshJob() {
 576         Future<?> localRefreshThermostatsJob = refreshMonitorsJob;
 577         if (localRefreshThermostatsJob != null) {
 578             localRefreshThermostatsJob.cancel(true);
 579             logger.debug("Bridge: Canceling monitors refresh job");
 580             refreshMonitorsJob = null;
 581         }
 582     }
 583 }