git.basschouten.com Git - openhab-addons.git/blob

   1 /**
   2  * Copyright (c) 2010-2023 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.remoteopenhab.internal.rest;
  14
  15 import java.io.ByteArrayOutputStream;
  16 import java.io.EOFException;
  17 import java.io.IOException;
  18 import java.io.InputStream;
  19 import java.nio.charset.StandardCharsets;
  20 import java.util.Arrays;
  21 import java.util.Base64;
  22 import java.util.HashMap;
  23 import java.util.List;
  24 import java.util.Map;
  25 import java.util.Objects;
  26 import java.util.concurrent.CopyOnWriteArrayList;
  27 import java.util.concurrent.ExecutionException;
  28 import java.util.concurrent.TimeUnit;
  29 import java.util.concurrent.TimeoutException;
  30
  31 import javax.net.ssl.HostnameVerifier;
  32 import javax.net.ssl.SSLSession;
  33 import javax.ws.rs.client.Client;
  34 import javax.ws.rs.client.ClientBuilder;
  35 import javax.ws.rs.core.HttpHeaders;
  36 import javax.ws.rs.sse.InboundSseEvent;
  37 import javax.ws.rs.sse.SseEventSource;
  38
  39 import org.eclipse.jdt.annotation.NonNullByDefault;
  40 import org.eclipse.jdt.annotation.Nullable;
  41 import org.eclipse.jetty.client.HttpClient;
  42 import org.eclipse.jetty.client.api.ContentResponse;
  43 import org.eclipse.jetty.client.api.Request;
  44 import org.eclipse.jetty.client.api.Response;
  45 import org.eclipse.jetty.client.util.InputStreamResponseListener;
  46 import org.eclipse.jetty.client.util.StringContentProvider;
  47 import org.eclipse.jetty.http.HttpMethod;
  48 import org.eclipse.jetty.http.HttpStatus;
  49 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabChannelDescriptionChangedEvent;
  50 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabChannelTriggerEvent;
  51 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabCommandDescription;
  52 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabCommandOptions;
  53 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabEvent;
  54 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabEventPayload;
  55 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabItem;
  56 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabRestApi;
  57 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabStateDescription;
  58 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabStateOptions;
  59 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabStatusInfo;
  60 import org.openhab.binding.remoteopenhab.internal.data.RemoteopenhabThing;
  61 import org.openhab.binding.remoteopenhab.internal.exceptions.RemoteopenhabException;
  62 import org.openhab.binding.remoteopenhab.internal.listener.RemoteopenhabItemsDataListener;
  63 import org.openhab.binding.remoteopenhab.internal.listener.RemoteopenhabStreamingDataListener;
  64 import org.openhab.binding.remoteopenhab.internal.listener.RemoteopenhabThingsDataListener;
  65 import org.openhab.core.i18n.TranslationProvider;
  66 import org.openhab.core.types.Command;
  67 import org.osgi.framework.Bundle;
  68 import org.osgi.framework.FrameworkUtil;
  69 import org.osgi.service.jaxrs.client.SseEventSourceFactory;
  70 import org.slf4j.Logger;
  71 import org.slf4j.LoggerFactory;
  72
  73 import com.google.gson.Gson;
  74 import com.google.gson.JsonSyntaxException;
  75
  76 /**
  77  * A client to use the openHAB REST API and to receive/parse events received from the openHAB REST API Server-Sent
  78  * Events (SSE).
  79  *
  80  * @author Laurent Garnier - Initial contribution
  81  */
  82 @NonNullByDefault
  83 public class RemoteopenhabRestClient {
  84
  85     private static final int REQUEST_TIMEOUT = (int) TimeUnit.SECONDS.toMillis(30);
  86
  87     private final Logger logger = LoggerFactory.getLogger(RemoteopenhabRestClient.class);
  88
  89     private final ClientBuilder clientBuilder;
  90     private final SseEventSourceFactory eventSourceFactory;
  91     private final Gson jsonParser;
  92     private final TranslationProvider i18nProvider;
  93     private final Bundle bundle;
  94
  95     private final Object startStopLock = new Object();
  96     private final List<RemoteopenhabStreamingDataListener> listeners = new CopyOnWriteArrayList<>();
  97     private final List<RemoteopenhabItemsDataListener> itemsListeners = new CopyOnWriteArrayList<>();
  98     private final List<RemoteopenhabThingsDataListener> thingsListeners = new CopyOnWriteArrayList<>();
  99
 100     private HttpClient httpClient;
 101     private @Nullable String restUrl;
 102     private @Nullable String restApiVersion;
 103     private Map<String, @Nullable String> apiEndPointsUrls = new HashMap<>();
 104     private @Nullable String topicNamespace;
 105     private boolean authenticateAnyway;
 106     private String accessToken;
 107     private String credentialToken;
 108     private boolean trustedCertificate;
 109     private boolean connected;
 110     private boolean completed;
 111
 112     private @Nullable SseEventSource eventSource;
 113     private long lastEventTimestamp;
 114
 115     public RemoteopenhabRestClient(final HttpClient httpClient, final ClientBuilder clientBuilder,
 116             final SseEventSourceFactory eventSourceFactory, final Gson jsonParser,
 117             final TranslationProvider i18nProvider) {
 118         this.httpClient = httpClient;
 119         this.clientBuilder = clientBuilder;
 120         this.eventSourceFactory = eventSourceFactory;
 121         this.jsonParser = jsonParser;
 122         this.i18nProvider = i18nProvider;
 123         this.bundle = FrameworkUtil.getBundle(this.getClass());
 124         this.accessToken = "";
 125         this.credentialToken = "";
 126     }
 127
 128     public void setHttpClient(HttpClient httpClient) {
 129         this.httpClient = httpClient;
 130     }
 131
 132     public String getRestUrl() throws RemoteopenhabException {
 133         String url = restUrl;
 134         if (url == null) {
 135             throw new RemoteopenhabException("@text/exception.rest-client-not-setup");
 136         }
 137         return url;
 138     }
 139
 140     public void setRestUrl(String restUrl) {
 141         this.restUrl = restUrl;
 142     }
 143
 144     public void setAuthenticationData(boolean authenticateAnyway, String accessToken, String username,
 145             String password) {
 146         this.authenticateAnyway = authenticateAnyway;
 147         this.accessToken = accessToken;
 148         if (username.isBlank() || password.isBlank()) {
 149             this.credentialToken = "";
 150         } else {
 151             String token = username + ":" + password;
 152             this.credentialToken = Base64.getEncoder().encodeToString(token.getBytes(StandardCharsets.UTF_8));
 153         }
 154     }
 155
 156     public void setTrustedCertificate(boolean trustedCertificate) {
 157         this.trustedCertificate = trustedCertificate;
 158     }
 159
 160     public void tryApi() throws RemoteopenhabException {
 161         try {
 162             String jsonResponse = executeGetUrl(getRestUrl(), "application/json", false, false);
 163             if (jsonResponse.isEmpty()) {
 164                 throw new RemoteopenhabException("@text/exception.json-response-empty");
 165             }
 166             RemoteopenhabRestApi restApi = jsonParser.fromJson(jsonResponse, RemoteopenhabRestApi.class);
 167             restApiVersion = restApi.version;
 168             logger.debug("REST API version = {}", restApiVersion);
 169             apiEndPointsUrls.clear();
 170             for (int i = 0; i < restApi.links.length; i++) {
 171                 apiEndPointsUrls.put(restApi.links[i].type, restApi.links[i].url);
 172             }
 173             logger.debug("REST API items = {}", apiEndPointsUrls.get("items"));
 174             logger.debug("REST API things = {}", apiEndPointsUrls.get("things"));
 175             logger.debug("REST API events = {}", apiEndPointsUrls.get("events"));
 176             topicNamespace = restApi.runtimeInfo != null ? "openhab" : "smarthome";
 177             logger.debug("topic namespace = {}", topicNamespace);
 178         } catch (RemoteopenhabException | JsonSyntaxException e) {
 179             throw new RemoteopenhabException("@text/exception.root-rest-api-failed", e);
 180         }
 181     }
 182
 183     public List<RemoteopenhabItem> getRemoteItems(@Nullable String fields) throws RemoteopenhabException {
 184         try {
 185             String url = String.format("%s?recursive=false", getRestApiUrl("items"));
 186             if (fields != null) {
 187                 url += "&fields=" + fields;
 188             }
 189             boolean asyncReading = fields == null || Arrays.asList(fields.split(",")).contains("state");
 190             String jsonResponse = executeGetUrl(url, "application/json", false, asyncReading);
 191             if (jsonResponse.isEmpty()) {
 192                 throw new RemoteopenhabException("@text/exception.json-response-empty");
 193             }
 194             return Arrays.asList(jsonParser.fromJson(jsonResponse, RemoteopenhabItem[].class));
 195         } catch (RemoteopenhabException | JsonSyntaxException e) {
 196             throw new RemoteopenhabException("@text/exception.get-list-items-api-failed", e);
 197         }
 198     }
 199
 200     public String getRemoteItemState(String itemName) throws RemoteopenhabException {
 201         try {
 202             String url = String.format("%s/%s/state", getRestApiUrl("items"), itemName);
 203             return executeGetUrl(url, "text/plain", false, true);
 204         } catch (RemoteopenhabException e) {
 205             throw new RemoteopenhabException("@text/get-item-state-api-failed", e, itemName);
 206         }
 207     }
 208
 209     public void sendCommandToRemoteItem(String itemName, Command command) throws RemoteopenhabException {
 210         try {
 211             String url = String.format("%s/%s", getRestApiUrl("items"), itemName);
 212             executeUrl(HttpMethod.POST, url, "application/json", command.toFullString(), "text/plain", false, false,
 213                     true);
 214         } catch (RemoteopenhabException e) {
 215             throw new RemoteopenhabException("@text/exception.send-item-command-api-failed", e, itemName);
 216         }
 217     }
 218
 219     public List<RemoteopenhabThing> getRemoteThings() throws RemoteopenhabException {
 220         try {
 221             String jsonResponse = executeGetUrl(getRestApiUrl("things"), "application/json", true, false);
 222             if (jsonResponse.isEmpty()) {
 223                 throw new RemoteopenhabException("@text/exception.json-response-empty");
 224             }
 225             return Arrays.asList(jsonParser.fromJson(jsonResponse, RemoteopenhabThing[].class));
 226         } catch (RemoteopenhabException | JsonSyntaxException e) {
 227             throw new RemoteopenhabException("@text/exception.get-list-things-api-failed", e);
 228         }
 229     }
 230
 231     public RemoteopenhabThing getRemoteThing(String uid) throws RemoteopenhabException {
 232         try {
 233             String url = String.format("%s/%s", getRestApiUrl("things"), uid);
 234             String jsonResponse = executeGetUrl(url, "application/json", true, false);
 235             if (jsonResponse.isEmpty()) {
 236                 throw new RemoteopenhabException("@text/exception.json-response-empty");
 237             }
 238             return Objects.requireNonNull(jsonParser.fromJson(jsonResponse, RemoteopenhabThing.class));
 239         } catch (RemoteopenhabException | JsonSyntaxException e) {
 240             throw new RemoteopenhabException("@text/exception.get-thing-api-failed", e, uid);
 241         }
 242     }
 243
 244     public @Nullable String getRestApiVersion() {
 245         return restApiVersion;
 246     }
 247
 248     private String getRestApiUrl(String endPoint) throws RemoteopenhabException {
 249         String url = apiEndPointsUrls.get(endPoint);
 250         if (url == null) {
 251             url = getRestUrl();
 252             if (!url.endsWith("/")) {
 253                 url += "/";
 254             }
 255             url += endPoint;
 256         }
 257         return url;
 258     }
 259
 260     public String getTopicNamespace() {
 261         String namespace = topicNamespace;
 262         return namespace != null ? namespace : "openhab";
 263     }
 264
 265     public void start() {
 266         synchronized (startStopLock) {
 267             logger.debug("Opening EventSource");
 268             reopenEventSource();
 269             logger.debug("EventSource started");
 270         }
 271     }
 272
 273     public void stop(boolean waitingForCompletion) {
 274         synchronized (startStopLock) {
 275             logger.debug("Closing EventSource");
 276             closeEventSource(waitingForCompletion);
 277             logger.debug("EventSource stopped");
 278             lastEventTimestamp = 0;
 279         }
 280     }
 281
 282     private SseEventSource createEventSource(String restSseUrl) {
 283         String credentialToken = restSseUrl.startsWith("https:") || authenticateAnyway ? this.credentialToken : "";
 284
 285         RemoteopenhabStreamingRequestFilter filter;
 286         boolean filterRegistered = clientBuilder.getConfiguration()
 287                 .isRegistered(RemoteopenhabStreamingRequestFilter.class);
 288         if (filterRegistered) {
 289             filter = clientBuilder.getConfiguration().getInstances().stream()
 290                     .filter(instance -> instance instanceof RemoteopenhabStreamingRequestFilter)
 291                     .map(instance -> (RemoteopenhabStreamingRequestFilter) instance).findAny().orElseThrow();
 292         } else {
 293             filter = new RemoteopenhabStreamingRequestFilter();
 294         }
 295         filter.setCredentialToken(restSseUrl, credentialToken);
 296
 297         Client client;
 298         // Avoid a timeout exception after 1 minute by setting the read timeout to 0 (infinite)
 299         if (trustedCertificate) {
 300             HostnameVerifier alwaysValidHostname = new HostnameVerifier() {
 301                 @Override
 302                 public boolean verify(@Nullable String hostname, @Nullable SSLSession session) {
 303                     return true;
 304                 }
 305             };
 306             if (filterRegistered) {
 307                 client = clientBuilder.sslContext(httpClient.getSslContextFactory().getSslContext())
 308                         .hostnameVerifier(alwaysValidHostname).readTimeout(0, TimeUnit.SECONDS).build();
 309             } else {
 310                 client = clientBuilder.sslContext(httpClient.getSslContextFactory().getSslContext())
 311                         .hostnameVerifier(alwaysValidHostname).readTimeout(0, TimeUnit.SECONDS).register(filter)
 312                         .build();
 313             }
 314         } else {
 315             if (filterRegistered) {
 316                 client = clientBuilder.readTimeout(0, TimeUnit.SECONDS).build();
 317             } else {
 318                 client = clientBuilder.readTimeout(0, TimeUnit.SECONDS).register(filter).build();
 319             }
 320         }
 321
 322         SseEventSource eventSource = eventSourceFactory.newSource(client.target(restSseUrl));
 323         eventSource.register(this::onEvent, this::onError, this::onComplete);
 324         return eventSource;
 325     }
 326
 327     private void reopenEventSource() {
 328         logger.debug("Reopening EventSource");
 329
 330         String url;
 331         try {
 332             url = String.format(
 333                     "%s?topics=%s/items/*/*,%s/things/*/*,%s/channels/*/triggered,openhab/channels/*/descriptionchanged",
 334                     getRestApiUrl("events"), getTopicNamespace(), getTopicNamespace(), getTopicNamespace());
 335         } catch (RemoteopenhabException e) {
 336             logger.debug("reopenEventSource failed: {}", e.getMessage(bundle, i18nProvider));
 337             return;
 338         }
 339
 340         closeEventSource(true);
 341
 342         logger.debug("Opening new EventSource {}", url);
 343         SseEventSource localEventSource = createEventSource(url);
 344         localEventSource.open();
 345
 346         eventSource = localEventSource;
 347     }
 348
 349     private void closeEventSource(boolean waitingForCompletion) {
 350         SseEventSource localEventSource = eventSource;
 351         if (localEventSource != null) {
 352             if (!localEventSource.isOpen() || completed) {
 353                 logger.debug("Existing EventSource is already closed");
 354             } else if (localEventSource.close(waitingForCompletion ? 10 : 0, TimeUnit.SECONDS)) {
 355                 logger.debug("Succesfully closed existing EventSource");
 356             } else {
 357                 logger.debug("Failed to close existing EventSource");
 358             }
 359             eventSource = null;
 360         }
 361         connected = false;
 362     }
 363
 364     public boolean addStreamingDataListener(RemoteopenhabStreamingDataListener listener) {
 365         return listeners.add(listener);
 366     }
 367
 368     public boolean removeStreamingDataListener(RemoteopenhabStreamingDataListener listener) {
 369         return listeners.remove(listener);
 370     }
 371
 372     public boolean addItemsDataListener(RemoteopenhabItemsDataListener listener) {
 373         return itemsListeners.add(listener);
 374     }
 375
 376     public boolean removeItemsDataListener(RemoteopenhabItemsDataListener listener) {
 377         return itemsListeners.remove(listener);
 378     }
 379
 380     public boolean addThingsDataListener(RemoteopenhabThingsDataListener listener) {
 381         return thingsListeners.add(listener);
 382     }
 383
 384     public boolean removeThingsDataListener(RemoteopenhabThingsDataListener listener) {
 385         return thingsListeners.remove(listener);
 386     }
 387
 388     public long getLastEventTimestamp() {
 389         return lastEventTimestamp;
 390     }
 391
 392     private void onEvent(InboundSseEvent inboundEvent) {
 393         String name = inboundEvent.getName();
 394         String data = inboundEvent.readData();
 395         logger.trace("Received event name {} data {}", name, data);
 396
 397         lastEventTimestamp = System.currentTimeMillis();
 398         if (!connected) {
 399             logger.debug("Connected to streaming events");
 400             connected = true;
 401             listeners.forEach(listener -> listener.onConnected());
 402         }
 403         if (!"message".equals(name)) {
 404             // Ignore silently all events which are not "message" events. This includes the "alive" events.
 405             return;
 406         }
 407
 408         try {
 409             RemoteopenhabEvent event = jsonParser.fromJson(data, RemoteopenhabEvent.class);
 410             String itemName;
 411             String thingUID;
 412             RemoteopenhabEventPayload payload;
 413             RemoteopenhabItem item;
 414             RemoteopenhabThing thing;
 415             switch (event.type) {
 416                 case "ItemStateEvent":
 417                     itemName = extractItemNameFromTopic(event.topic, event.type, "state");
 418                     payload = jsonParser.fromJson(event.payload, RemoteopenhabEventPayload.class);
 419                     itemsListeners.forEach(
 420                             listener -> listener.onItemStateEvent(itemName, payload.type, payload.value, false));
 421                     break;
 422                 case "ItemStateChangedEvent":
 423                     itemName = extractItemNameFromTopic(event.topic, event.type, "statechanged");
 424                     payload = jsonParser.fromJson(event.payload, RemoteopenhabEventPayload.class);
 425                     itemsListeners.forEach(
 426                             listener -> listener.onItemStateEvent(itemName, payload.type, payload.value, true));
 427                     break;
 428                 case "GroupItemStateChangedEvent":
 429                     itemName = extractItemNameFromTopic(event.topic, event.type, "statechanged");
 430                     payload = jsonParser.fromJson(event.payload, RemoteopenhabEventPayload.class);
 431                     itemsListeners.forEach(
 432                             listener -> listener.onItemStateEvent(itemName, payload.type, payload.value, false));
 433                     break;
 434                 case "ItemAddedEvent":
 435                     itemName = extractItemNameFromTopic(event.topic, event.type, "added");
 436                     item = Objects.requireNonNull(jsonParser.fromJson(event.payload, RemoteopenhabItem.class));
 437                     itemsListeners.forEach(listener -> listener.onItemAdded(item));
 438                     break;
 439                 case "ItemRemovedEvent":
 440                     itemName = extractItemNameFromTopic(event.topic, event.type, "removed");
 441                     item = Objects.requireNonNull(jsonParser.fromJson(event.payload, RemoteopenhabItem.class));
 442                     itemsListeners.forEach(listener -> listener.onItemRemoved(item));
 443                     break;
 444                 case "ItemUpdatedEvent":
 445                     itemName = extractItemNameFromTopic(event.topic, event.type, "updated");
 446                     RemoteopenhabItem[] updItem = jsonParser.fromJson(event.payload, RemoteopenhabItem[].class);
 447                     if (updItem.length == 2) {
 448                         itemsListeners.forEach(listener -> listener.onItemUpdated(updItem[0], updItem[1]));
 449                     } else {
 450                         logger.debug("Invalid payload for event type {} for topic {}", event.type, event.topic);
 451                     }
 452                     break;
 453                 case "ThingStatusInfoChangedEvent":
 454                     thingUID = extractThingUIDFromTopic(event.topic, event.type, "statuschanged");
 455                     RemoteopenhabStatusInfo[] updStatus = jsonParser.fromJson(event.payload,
 456                             RemoteopenhabStatusInfo[].class);
 457                     if (updStatus.length == 2) {
 458                         thingsListeners.forEach(listener -> listener.onThingStatusUpdated(thingUID, updStatus[0]));
 459                     } else {
 460                         logger.debug("Invalid payload for event type {} for topic {}", event.type, event.topic);
 461                     }
 462                     break;
 463                 case "ThingAddedEvent":
 464                     thingUID = extractThingUIDFromTopic(event.topic, event.type, "added");
 465                     thing = Objects.requireNonNull(jsonParser.fromJson(event.payload, RemoteopenhabThing.class));
 466                     thingsListeners.forEach(listener -> listener.onThingAdded(thing));
 467                     break;
 468                 case "ThingRemovedEvent":
 469                     thingUID = extractThingUIDFromTopic(event.topic, event.type, "removed");
 470                     thing = Objects.requireNonNull(jsonParser.fromJson(event.payload, RemoteopenhabThing.class));
 471                     thingsListeners.forEach(listener -> listener.onThingRemoved(thing));
 472                     break;
 473                 case "ChannelTriggeredEvent":
 474                     RemoteopenhabChannelTriggerEvent triggerEvent = jsonParser.fromJson(event.payload,
 475                             RemoteopenhabChannelTriggerEvent.class);
 476                     thingsListeners
 477                             .forEach(listener -> listener.onChannelTriggered(triggerEvent.channel, triggerEvent.event));
 478                     break;
 479                 case "ChannelDescriptionChangedEvent":
 480                     RemoteopenhabStateDescription stateDescription = new RemoteopenhabStateDescription();
 481                     RemoteopenhabCommandDescription commandDescription = new RemoteopenhabCommandDescription();
 482                     RemoteopenhabChannelDescriptionChangedEvent descriptionChanged = Objects.requireNonNull(
 483                             jsonParser.fromJson(event.payload, RemoteopenhabChannelDescriptionChangedEvent.class));
 484                     switch (descriptionChanged.field) {
 485                         case "STATE_OPTIONS":
 486                             RemoteopenhabStateOptions stateOptions = Objects.requireNonNull(
 487                                     jsonParser.fromJson(descriptionChanged.value, RemoteopenhabStateOptions.class));
 488                             stateDescription.options = stateOptions.options;
 489                             break;
 490                         case "COMMAND_OPTIONS":
 491                             RemoteopenhabCommandOptions commandOptions = Objects.requireNonNull(
 492                                     jsonParser.fromJson(descriptionChanged.value, RemoteopenhabCommandOptions.class));
 493                             commandDescription.commandOptions = commandOptions.options;
 494                             break;
 495                         default:
 496                             break;
 497                     }
 498                     if (stateDescription.options != null || commandDescription.commandOptions != null) {
 499                         descriptionChanged.linkedItemNames.forEach(linkedItemName -> {
 500                             RemoteopenhabItem item1 = new RemoteopenhabItem();
 501                             item1.name = linkedItemName;
 502                             item1.stateDescription = stateDescription;
 503                             item1.commandDescription = commandDescription;
 504                             itemsListeners.forEach(listener -> listener.onItemOptionsUpdatedd(item1));
 505                         });
 506                     }
 507                     break;
 508                 case "ItemStatePredictedEvent":
 509                 case "ItemCommandEvent":
 510                 case "ThingStatusInfoEvent":
 511                 case "ThingUpdatedEvent":
 512                     logger.trace("Ignored event type {} for topic {}", event.type, event.topic);
 513                     break;
 514                 default:
 515                     logger.debug("Unexpected event type {} for topic {}", event.type, event.topic);
 516                     break;
 517             }
 518         } catch (RemoteopenhabException | JsonSyntaxException e) {
 519             logger.debug("An exception occurred while processing the inbound '{}' event containg data: {}", name, data,
 520                     e);
 521         }
 522     }
 523
 524     private void onComplete() {
 525         logger.debug("Disconnected from streaming events");
 526         completed = true;
 527         listeners.forEach(listener -> listener.onDisconnected());
 528     }
 529
 530     private void onError(Throwable error) {
 531         logger.debug("Error occurred while receiving events", error);
 532         listeners.forEach(listener -> listener.onError("Error occurred while receiving events"));
 533     }
 534
 535     private String extractItemNameFromTopic(String topic, String eventType, String finalPart)
 536             throws RemoteopenhabException {
 537         String[] parts = topic.split("/");
 538         int expectedNbParts = "GroupItemStateChangedEvent".equals(eventType) ? 5 : 4;
 539         if (parts.length != expectedNbParts || !getTopicNamespace().equals(parts[0]) || !"items".equals(parts[1])
 540                 || !finalPart.equals(parts[parts.length - 1])) {
 541             throw new RemoteopenhabException("@text/exception.invalid-event-topic", topic, eventType);
 542         }
 543         return parts[2];
 544     }
 545
 546     private String extractThingUIDFromTopic(String topic, String eventType, String finalPart)
 547             throws RemoteopenhabException {
 548         String[] parts = topic.split("/");
 549         int expectedNbParts = 4;
 550         if (parts.length != expectedNbParts || !getTopicNamespace().equals(parts[0]) || !"things".equals(parts[1])
 551                 || !finalPart.equals(parts[parts.length - 1])) {
 552             throw new RemoteopenhabException("@text/exception.invalid-event-topic", topic, eventType);
 553         }
 554         return parts[2];
 555     }
 556
 557     public String executeGetUrl(String url, String acceptHeader, boolean provideAccessToken, boolean asyncReading)
 558             throws RemoteopenhabException {
 559         return executeUrl(HttpMethod.GET, url, acceptHeader, null, null, provideAccessToken, asyncReading, true);
 560     }
 561
 562     public String executeUrl(HttpMethod httpMethod, String url, String acceptHeader, @Nullable String content,
 563             @Nullable String contentType, boolean provideAccessToken, boolean asyncReading, boolean retryIfEOF)
 564             throws RemoteopenhabException {
 565         final Request request = httpClient.newRequest(url).method(httpMethod)
 566                 .timeout(REQUEST_TIMEOUT, TimeUnit.MILLISECONDS).followRedirects(false)
 567                 .header(HttpHeaders.ACCEPT, acceptHeader);
 568
 569         if (url.startsWith("https:") || authenticateAnyway) {
 570             boolean useAlternativeHeader = false;
 571             if (!credentialToken.isEmpty()) {
 572                 request.header(HttpHeaders.AUTHORIZATION, "Basic " + credentialToken);
 573                 useAlternativeHeader = true;
 574             }
 575             if (provideAccessToken && !accessToken.isEmpty()) {
 576                 if (useAlternativeHeader) {
 577                     request.header("X-OPENHAB-TOKEN", accessToken);
 578                 } else {
 579                     request.header(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);
 580                 }
 581             }
 582         }
 583
 584         if (content != null && (HttpMethod.POST.equals(httpMethod) || HttpMethod.PUT.equals(httpMethod))
 585                 && contentType != null) {
 586             request.content(new StringContentProvider(content), contentType);
 587         }
 588
 589         logger.debug("Request {} {}", request.getMethod(), request.getURI());
 590
 591         try {
 592             if (asyncReading) {
 593                 InputStreamResponseListener listener = new InputStreamResponseListener();
 594                 request.send(listener);
 595                 Response response = listener.get(5, TimeUnit.SECONDS);
 596                 int statusCode = response.getStatus();
 597                 if (statusCode != HttpStatus.OK_200) {
 598                     response.abort(new Exception(response.getReason()));
 599                     String statusLine = statusCode + " " + response.getReason();
 600                     throw new RemoteopenhabException("@text/exception.http-call-failed", statusLine);
 601                 }
 602                 ByteArrayOutputStream responseContent = new ByteArrayOutputStream();
 603                 try (InputStream input = listener.getInputStream()) {
 604                     input.transferTo(responseContent);
 605                 }
 606                 return new String(responseContent.toByteArray(), StandardCharsets.UTF_8.name());
 607             } else {
 608                 ContentResponse response = request.send();
 609                 int statusCode = response.getStatus();
 610                 if (statusCode == HttpStatus.MOVED_PERMANENTLY_301 || statusCode == HttpStatus.FOUND_302) {
 611                     String locationHeader = response.getHeaders().get(HttpHeaders.LOCATION);
 612                     if (locationHeader != null && !locationHeader.isBlank()) {
 613                         logger.debug("The remopte server redirected the request to this URL: {}", locationHeader);
 614                         return executeUrl(httpMethod, locationHeader, acceptHeader, content, contentType,
 615                                 provideAccessToken, asyncReading, retryIfEOF);
 616                     } else {
 617                         String statusLine = statusCode + " " + response.getReason();
 618                         throw new RemoteopenhabException("@text/exception.http-call-failed", statusLine);
 619                     }
 620                 } else if (statusCode >= HttpStatus.BAD_REQUEST_400) {
 621                     String statusLine = statusCode + " " + response.getReason();
 622                     throw new RemoteopenhabException("@text/exception.http-call-failed", statusLine);
 623                 }
 624                 String encoding = response.getEncoding() != null ? response.getEncoding().replace("\"", "").trim()
 625                         : StandardCharsets.UTF_8.name();
 626                 return new String(response.getContent(), encoding);
 627             }
 628         } catch (ExecutionException e) {
 629             // After a long network outage, the first HTTP request will fail with an EOFException exception.
 630             // We retry the request a second time in this case.
 631             Throwable cause = e.getCause();
 632             if (retryIfEOF && cause instanceof EOFException) {
 633                 logger.debug("EOFException - retry the request");
 634                 return executeUrl(httpMethod, url, acceptHeader, content, contentType, provideAccessToken, asyncReading,
 635                         false);
 636             } else {
 637                 throw new RemoteopenhabException(e);
 638             }
 639         } catch (IOException | TimeoutException e) {
 640             throw new RemoteopenhabException(e);
 641         } catch (InterruptedException e) {
 642             Thread.currentThread().interrupt();
 643             throw new RemoteopenhabException(e);
 644         }
 645     }
 646 }