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   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.elroconnects.internal.handler;
  14
  15 import java.lang.reflect.Type;
  16 import java.net.SocketTimeoutException;
  17 import java.net.URI;
  18 import java.util.Collection;
  19 import java.util.Collections;
  20 import java.util.HashMap;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.concurrent.CompletableFuture;
  24 import java.util.concurrent.ExecutionException;
  25 import java.util.concurrent.ScheduledFuture;
  26 import java.util.concurrent.TimeUnit;
  27 import java.util.concurrent.TimeoutException;
  28
  29 import org.eclipse.jdt.annotation.NonNullByDefault;
  30 import org.eclipse.jdt.annotation.Nullable;
  31 import org.eclipse.jetty.client.HttpClient;
  32 import org.eclipse.jetty.client.HttpResponse;
  33 import org.eclipse.jetty.client.api.Request;
  34 import org.eclipse.jetty.client.api.Result;
  35 import org.eclipse.jetty.client.util.BufferingResponseListener;
  36 import org.eclipse.jetty.client.util.StringContentProvider;
  37 import org.eclipse.jetty.http.HttpHeader;
  38 import org.eclipse.jetty.http.HttpMethod;
  39 import org.openhab.binding.elroconnects.internal.devices.ElroConnectsConnector;
  40 import org.openhab.binding.elroconnects.internal.discovery.ElroConnectsBridgeDiscoveryService;
  41 import org.openhab.core.thing.Bridge;
  42 import org.openhab.core.thing.ChannelUID;
  43 import org.openhab.core.thing.ThingStatus;
  44 import org.openhab.core.thing.ThingStatusDetail;
  45 import org.openhab.core.thing.binding.BaseBridgeHandler;
  46 import org.openhab.core.thing.binding.ThingHandlerService;
  47 import org.openhab.core.types.Command;
  48 import org.slf4j.Logger;
  49 import org.slf4j.LoggerFactory;
  50
  51 import com.google.gson.Gson;
  52 import com.google.gson.JsonParseException;
  53 import com.google.gson.reflect.TypeToken;
  54
  55 /**
  56  * The {@link ElroConnectsAccountHandler} is the bridge handler responsible to for connecting the the ELRO Connects
  57  * cloud service and retrieving the defined K1 hubs.
  58  *
  59  * @author Mark Herwege - Initial contribution
  60  */
  61 @NonNullByDefault
  62 public class ElroConnectsAccountHandler extends BaseBridgeHandler {
  63
  64     private final Logger logger = LoggerFactory.getLogger(ElroConnectsAccountHandler.class);
  65
  66     private static final String ELRO_CLOUD_LOGIN_URL = "https://uaa-openapi.hekreu.me/login";
  67     private static final String ELRO_CLOUD_URL = "https://user-openapi.hekreu.me/device";
  68     private static final String ELRO_PID = "01288154146"; // ELRO Connects Enterprise PID on hekr cloud
  69
  70     private static final int TIMEOUT_MS = 2500;
  71     private static final int REFRESH_INTERVAL_S = 300;
  72
  73     private boolean enableBackgroundDiscovery = true;
  74
  75     private volatile @Nullable ScheduledFuture<?> pollingJob;
  76     private final HttpClient client;
  77
  78     private Gson gson = new Gson();
  79     private Type loginType = new TypeToken<Map<String, String>>() {
  80     }.getType();
  81     private Type deviceListType = new TypeToken<List<ElroConnectsConnector>>() {
  82     }.getType();
  83
  84     private final Map<String, String> login = new HashMap<>();
  85     private String loginJson = "";
  86     private volatile @Nullable String accessToken;
  87
  88     private volatile boolean retry = false; // Flag for retrying login when token expired during poll, prevents multiple
  89                                             // recursive retries
  90
  91     private volatile Map<String, ElroConnectsConnector> devices = new HashMap<>();
  92
  93     private @Nullable ElroConnectsBridgeDiscoveryService discoveryService = null;
  94
  95     public ElroConnectsAccountHandler(Bridge bridge, HttpClient client) {
  96         super(bridge);
  97         this.client = client;
  98         login.put("pid", ELRO_PID);
  99         login.put("clientType", "WEB");
 100     }
 101
 102     @Override
 103     public void initialize() {
 104         accessToken = null;
 105
 106         ElroConnectsAccountConfiguration config = getConfigAs(ElroConnectsAccountConfiguration.class);
 107         String username = config.username;
 108         String password = config.password;
 109         enableBackgroundDiscovery = config.enableBackgroundDiscovery;
 110
 111         if ((username == null) || username.isEmpty()) {
 112             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_PENDING, "@text/offline.no-username");
 113             return;
 114         }
 115         if ((password == null) || password.isEmpty()) {
 116             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_PENDING, "@text/offline.no-password");
 117             return;
 118         }
 119
 120         login.put("username", username);
 121         login.put("password", password);
 122         loginJson = gson.toJson(login);
 123
 124         updateStatus(ThingStatus.UNKNOWN);
 125
 126         // If background discovery is enabled, start polling (will do login first), else only login to take the thing
 127         // online if successful
 128         if (enableBackgroundDiscovery) {
 129             startPolling();
 130         } else {
 131             scheduler.execute(this::login);
 132         }
 133     }
 134
 135     @Override
 136     public void dispose() {
 137         logger.debug("Handler disposed");
 138         stopPolling();
 139         super.dispose();
 140     }
 141
 142     private void startPolling() {
 143         final ScheduledFuture<?> localRefreshJob = this.pollingJob;
 144         if (localRefreshJob == null || localRefreshJob.isCancelled()) {
 145             logger.debug("Start polling");
 146             pollingJob = scheduler.scheduleWithFixedDelay(this::poll, 0, REFRESH_INTERVAL_S, TimeUnit.SECONDS);
 147         }
 148
 149         ElroConnectsBridgeDiscoveryService service = this.discoveryService;
 150         if (service != null) {
 151             service.startBackgroundDiscovery();
 152         }
 153     }
 154
 155     private void stopPolling() {
 156         ElroConnectsBridgeDiscoveryService service = this.discoveryService;
 157         if (service != null) {
 158             service.stopBackgroundDiscovery();
 159         }
 160
 161         final ScheduledFuture<?> localPollingJob = this.pollingJob;
 162         if (localPollingJob != null && !localPollingJob.isCancelled()) {
 163             logger.debug("Stop polling");
 164             localPollingJob.cancel(true);
 165             pollingJob = null;
 166         }
 167     }
 168
 169     private void poll() {
 170         logger.debug("Polling");
 171
 172         // when access token not yet received or expired, try to login first
 173         if (accessToken == null) {
 174             login();
 175         }
 176         if (accessToken == null) {
 177             return;
 178         }
 179
 180         try {
 181             getControllers().handle((devicesList, accountException) -> {
 182                 if (devicesList != null) {
 183                     logger.trace("deviceList response: {}", devicesList);
 184
 185                     List<ElroConnectsConnector> response = null;
 186                     try {
 187                         response = gson.fromJson(devicesList, deviceListType);
 188                     } catch (JsonParseException parseException) {
 189                         logger.warn("Parsing failed: {}", parseException.getMessage());
 190                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 191                                 "@text/offline.request-failed");
 192                         return null;
 193                     }
 194                     Map<String, ElroConnectsConnector> devices = new HashMap<>();
 195                     if (response != null) {
 196                         response.forEach(d -> devices.put(d.getDevTid(), d));
 197                     }
 198                     this.devices = devices;
 199                     updateStatus(ThingStatus.ONLINE);
 200                 } else {
 201                     if (accountException == null) {
 202                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR);
 203                     } else {
 204                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 205                                 accountException.getLocalizedMessage());
 206                     }
 207                 }
 208
 209                 return null;
 210             }).get();
 211         } catch (InterruptedException e) {
 212             updateStatus(ThingStatus.OFFLINE);
 213             Thread.currentThread().interrupt();
 214         } catch (ExecutionException e) {
 215             logger.debug("Poll exception", e);
 216             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR);
 217         }
 218     }
 219
 220     private void login() {
 221         logger.debug("Login");
 222         try {
 223             getAccessToken().handle((accessToken, accountException) -> {
 224                 this.accessToken = accessToken;
 225                 if (accessToken != null) {
 226                     updateStatus(ThingStatus.ONLINE);
 227                 } else {
 228                     if (accountException == null) {
 229                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR);
 230                     } else {
 231                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 232                                 accountException.getLocalizedMessage());
 233                     }
 234                 }
 235
 236                 return null;
 237             }).get();
 238         } catch (InterruptedException e) {
 239             updateStatus(ThingStatus.OFFLINE);
 240             Thread.currentThread().interrupt();
 241         } catch (ExecutionException e) {
 242             logger.debug("Login exception", e);
 243             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR);
 244         }
 245     }
 246
 247     private CompletableFuture<@Nullable String> getAccessToken() {
 248         CompletableFuture<@Nullable String> f = new CompletableFuture<>();
 249         Request request = client.newRequest(URI.create(ELRO_CLOUD_LOGIN_URL));
 250
 251         request.method(HttpMethod.POST).content(new StringContentProvider(loginJson), "application/json")
 252                 .timeout(TIMEOUT_MS, TimeUnit.MILLISECONDS).send(new BufferingResponseListener() {
 253                     @NonNullByDefault({})
 254                     @Override
 255                     public void onComplete(Result result) {
 256                         if (result.isSucceeded()) {
 257                             final HttpResponse response = (HttpResponse) result.getResponse();
 258                             if (response.getStatus() == 200) {
 259                                 try {
 260                                     Map<String, String> content = gson.fromJson(getContentAsString(), loginType);
 261                                     String accessToken = (content != null) ? content.get("access_token") : null;
 262                                     f.complete(accessToken);
 263                                 } catch (JsonParseException parseException) {
 264                                     logger.warn("Access token request response parsing failed: {}",
 265                                             parseException.getMessage());
 266                                     f.completeExceptionally(
 267                                             new ElroConnectsAccountException("@text/offline.request-failed"));
 268                                 }
 269                             } else if (response.getStatus() == 401) {
 270                                 f.completeExceptionally(
 271                                         new ElroConnectsAccountException("@text/offline.credentials-error"));
 272                             } else {
 273                                 logger.warn("Unexpected response on access token request: {} - {}",
 274                                         response.getStatus(), getContentAsString());
 275                                 f.completeExceptionally(
 276                                         new ElroConnectsAccountException("@text/offline.request-failed"));
 277                             }
 278                         } else {
 279                             Throwable e = result.getFailure();
 280                             if (e instanceof SocketTimeoutException || e instanceof TimeoutException) {
 281                                 f.completeExceptionally(
 282                                         new ElroConnectsAccountException("@text/offline.request-timeout", e));
 283                             } else {
 284                                 logger.warn("Access token request failed", e);
 285                                 f.completeExceptionally(
 286                                         new ElroConnectsAccountException("@text/offline.request-failed", e));
 287                             }
 288                         }
 289                     }
 290                 });
 291
 292         return f;
 293     }
 294
 295     private CompletableFuture<@Nullable String> getControllers() {
 296         CompletableFuture<@Nullable String> f = new CompletableFuture<>();
 297         Request request = client.newRequest(URI.create(ELRO_CLOUD_URL));
 298
 299         request.method(HttpMethod.GET).header(HttpHeader.AUTHORIZATION, "Bearer " + accessToken)
 300                 .header(HttpHeader.ACCEPT, "application/json").timeout(TIMEOUT_MS, TimeUnit.MILLISECONDS)
 301                 .send(new BufferingResponseListener() {
 302                     @NonNullByDefault({})
 303                     @Override
 304                     public void onComplete(Result result) {
 305                         if (result.isSucceeded()) {
 306                             final HttpResponse response = (HttpResponse) result.getResponse();
 307                             if (response.getStatus() == 200) {
 308                                 f.complete(getContentAsString());
 309                             } else if (response.getStatus() == 401) {
 310                                 // Access token expired, so clear it and do a poll that will now start with a login
 311                                 accessToken = null;
 312                                 if (!retry) { // Only retry once to avoid infinite recursive loop if no valid token is
 313                                               // received
 314                                     retry = true;
 315                                     logger.debug("Access token expired, retry");
 316                                     poll();
 317                                     if (accessToken == null) {
 318                                         logger.debug("Request for new token failed");
 319                                     }
 320                                 } else {
 321                                     logger.warn("Unexpected response after getting new token : {} - {}",
 322                                             response.getStatus(), getContentAsString());
 323                                     f.completeExceptionally(
 324                                             new ElroConnectsAccountException("@text/offline.request-failed"));
 325                                 }
 326                             } else {
 327                                 logger.warn("Unexpected response on get controllers request: {} - {}",
 328                                         response.getStatus(), getContentAsString());
 329                                 f.completeExceptionally(
 330                                         new ElroConnectsAccountException("@text/offline.request-failed"));
 331                             }
 332                         } else {
 333                             Throwable e = result.getFailure();
 334                             if (e instanceof SocketTimeoutException || e instanceof TimeoutException) {
 335                                 f.completeExceptionally(
 336                                         new ElroConnectsAccountException("@text/offline.request-timeout", e));
 337                             } else {
 338                                 logger.warn("Get controllers request failed", e);
 339                                 f.completeExceptionally(
 340                                         new ElroConnectsAccountException("@text/offline.request-failed", e));
 341                             }
 342                         }
 343                         retry = false;
 344                     }
 345                 });
 346
 347         return f;
 348     }
 349
 350     @Override
 351     public Collection<Class<? extends ThingHandlerService>> getServices() {
 352         return Collections.singleton(ElroConnectsBridgeDiscoveryService.class);
 353     }
 354
 355     /**
 356      * @return connectors on the account from the ELRO Connects cloud API
 357      */
 358     public @Nullable Map<String, ElroConnectsConnector> getDevices() {
 359         if (!enableBackgroundDiscovery) {
 360             poll();
 361         }
 362         return devices;
 363     }
 364
 365     @Override
 366     public void handleCommand(ChannelUID channelUID, Command command) {
 367         // nothing to do, there are no channels
 368     }
 369
 370     public void setDiscoveryService(ElroConnectsBridgeDiscoveryService discoveryService) {
 371         this.discoveryService = discoveryService;
 372     }
 373 }