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   1 /**
   2  * Copyright (c) 2010-2020 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.icalendar.internal.handler;
  14
  15 import static org.openhab.binding.icalendar.internal.ICalendarBindingConstants.*;
  16
  17 import java.io.File;
  18 import java.io.FileInputStream;
  19 import java.io.IOException;
  20 import java.math.BigDecimal;
  21 import java.net.URI;
  22 import java.net.URISyntaxException;
  23 import java.time.Instant;
  24 import java.util.List;
  25 import java.util.concurrent.ScheduledFuture;
  26 import java.util.concurrent.TimeUnit;
  27
  28 import org.eclipse.jdt.annotation.NonNullByDefault;
  29 import org.eclipse.jdt.annotation.Nullable;
  30 import org.eclipse.jetty.client.HttpClient;
  31 import org.openhab.binding.icalendar.internal.config.ICalendarConfiguration;
  32 import org.openhab.binding.icalendar.internal.handler.PullJob.CalendarUpdateListener;
  33 import org.openhab.binding.icalendar.internal.logic.AbstractPresentableCalendar;
  34 import org.openhab.binding.icalendar.internal.logic.CalendarException;
  35 import org.openhab.binding.icalendar.internal.logic.CommandTag;
  36 import org.openhab.binding.icalendar.internal.logic.CommandTagType;
  37 import org.openhab.binding.icalendar.internal.logic.Event;
  38 import org.openhab.core.OpenHAB;
  39 import org.openhab.core.events.EventPublisher;
  40 import org.openhab.core.i18n.TimeZoneProvider;
  41 import org.openhab.core.items.events.ItemEventFactory;
  42 import org.openhab.core.library.types.DateTimeType;
  43 import org.openhab.core.library.types.OnOffType;
  44 import org.openhab.core.library.types.StringType;
  45 import org.openhab.core.thing.Bridge;
  46 import org.openhab.core.thing.ChannelUID;
  47 import org.openhab.core.thing.Thing;
  48 import org.openhab.core.thing.ThingStatus;
  49 import org.openhab.core.thing.ThingStatusDetail;
  50 import org.openhab.core.thing.binding.BaseBridgeHandler;
  51 import org.openhab.core.thing.binding.ThingHandler;
  52 import org.openhab.core.types.Command;
  53 import org.openhab.core.types.RefreshType;
  54 import org.openhab.core.types.UnDefType;
  55 import org.slf4j.Logger;
  56 import org.slf4j.LoggerFactory;
  57
  58 /**
  59  * The {@link ICalendarHandler} is responsible for handling commands, which are
  60  * sent to one of the channels.
  61  *
  62  * @author Michael Wodniok - Initial contribution
  63  * @author Andrew Fiddian-Green - Support for Command Tags embedded in the Event description
  64  */
  65 @NonNullByDefault
  66 public class ICalendarHandler extends BaseBridgeHandler implements CalendarUpdateListener {
  67
  68     private final File calendarFile;
  69     private @Nullable ICalendarConfiguration configuration;
  70     private final EventPublisher eventPublisherCallback;
  71     private final HttpClient httpClient;
  72     private final Logger logger = LoggerFactory.getLogger(ICalendarHandler.class);
  73     private final TimeZoneProvider tzProvider;
  74     private @Nullable ScheduledFuture<?> pullJobFuture;
  75     private @Nullable AbstractPresentableCalendar runtimeCalendar;
  76     private @Nullable ScheduledFuture<?> updateJobFuture;
  77     private Instant updateStatesLastCalledTime;
  78     private @Nullable Instant calendarDownloadedTime;
  79
  80     public ICalendarHandler(Bridge bridge, HttpClient httpClient, EventPublisher eventPublisher,
  81             TimeZoneProvider tzProvider) {
  82         super(bridge);
  83         this.httpClient = httpClient;
  84         calendarFile = new File(OpenHAB.getUserDataFolder() + File.separator
  85                 + getThing().getUID().getAsString().replaceAll("[<>:\"/\\\\|?*]", "_") + ".ical");
  86         eventPublisherCallback = eventPublisher;
  87         updateStatesLastCalledTime = Instant.now();
  88         this.tzProvider = tzProvider;
  89     }
  90
  91     @Override
  92     public void dispose() {
  93         final ScheduledFuture<?> currentUpdateJobFuture = updateJobFuture;
  94         if (currentUpdateJobFuture != null) {
  95             currentUpdateJobFuture.cancel(true);
  96         }
  97         final ScheduledFuture<?> currentPullJobFuture = pullJobFuture;
  98         if (currentPullJobFuture != null) {
  99             currentPullJobFuture.cancel(true);
 100         }
 101     }
 102
 103     @Override
 104     public void handleCommand(ChannelUID channelUID, Command command) {
 105         switch (channelUID.getId()) {
 106             case CHANNEL_CURRENT_EVENT_PRESENT:
 107             case CHANNEL_CURRENT_EVENT_TITLE:
 108             case CHANNEL_CURRENT_EVENT_START:
 109             case CHANNEL_CURRENT_EVENT_END:
 110             case CHANNEL_NEXT_EVENT_TITLE:
 111             case CHANNEL_NEXT_EVENT_START:
 112             case CHANNEL_NEXT_EVENT_END:
 113                 if (command instanceof RefreshType) {
 114                     updateStates();
 115                 }
 116                 break;
 117             default:
 118                 logger.warn("Framework sent command to unknown channel with id '{}'", channelUID.getId());
 119         }
 120     }
 121
 122     @Override
 123     public void initialize() {
 124         final ICalendarConfiguration currentConfiguration = getConfigAs(ICalendarConfiguration.class);
 125         configuration = currentConfiguration;
 126
 127         try {
 128             if ((currentConfiguration.username == null && currentConfiguration.password != null)
 129                     || (currentConfiguration.username != null && currentConfiguration.password == null)) {
 130                 throw new ConfigBrokenException("Only one of username and password was set. This is invalid.");
 131             }
 132
 133             PullJob regularPull;
 134             final BigDecimal maxSizeBD = currentConfiguration.maxSize;
 135             if (maxSizeBD == null || maxSizeBD.intValue() < 1) {
 136                 throw new ConfigBrokenException(
 137                         "maxSize is either not set or less than 1 (mebibyte), which is not allowed.");
 138             }
 139             final int maxSize = maxSizeBD.intValue();
 140             try {
 141                 regularPull = new PullJob(httpClient, new URI(currentConfiguration.url), currentConfiguration.username,
 142                         currentConfiguration.password, calendarFile, maxSize * 1048576, this);
 143             } catch (URISyntaxException e) {
 144                 throw new ConfigBrokenException(String.format(
 145                         "The URI '%s' for downloading the calendar contains syntax errors.", currentConfiguration.url));
 146
 147             }
 148
 149             final BigDecimal refreshTimeBD = currentConfiguration.refreshTime;
 150             if (refreshTimeBD == null || refreshTimeBD.longValue() < 1) {
 151                 throw new ConfigBrokenException(
 152                         "refreshTime is either not set or less than 1 (minute), which is not allowed.");
 153             }
 154             final long refreshTime = refreshTimeBD.longValue();
 155             if (calendarFile.isFile()) {
 156                 updateStatus(ThingStatus.ONLINE);
 157
 158                 scheduler.submit(() -> {
 159                     // reload calendar file asynchronously
 160                     if (reloadCalendar()) {
 161                         updateStates();
 162                         updateChildren();
 163                     } else {
 164                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 165                                 "The calendar seems to be configured correctly, but the local copy of calendar could not be loaded.");
 166                     }
 167                 });
 168                 pullJobFuture = scheduler.scheduleWithFixedDelay(regularPull, refreshTime, refreshTime,
 169                         TimeUnit.MINUTES);
 170             } else {
 171                 updateStatus(ThingStatus.OFFLINE);
 172                 logger.debug(
 173                         "The calendar is currently offline as no local copy exists. It will go online as soon as a valid valid calendar is retrieved.");
 174                 pullJobFuture = scheduler.scheduleWithFixedDelay(regularPull, 0, refreshTime, TimeUnit.MINUTES);
 175             }
 176         } catch (ConfigBrokenException e) {
 177             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, e.getMessage());
 178         }
 179     }
 180
 181     @Override
 182     public void childHandlerInitialized(ThingHandler childHandler, Thing childThing) {
 183         final AbstractPresentableCalendar calendar = runtimeCalendar;
 184         if (calendar != null) {
 185             updateChild(childHandler);
 186         }
 187     }
 188
 189     @Override
 190     public void onCalendarUpdated() {
 191         if (reloadCalendar()) {
 192             updateStates();
 193             updateChildren();
 194         } else {
 195             logger.trace("Calendar was updated, but loading failed.");
 196         }
 197     }
 198
 199     /**
 200      * @return the calendar that is used for all operations
 201      */
 202     @Nullable
 203     public AbstractPresentableCalendar getRuntimeCalendar() {
 204         return runtimeCalendar;
 205     }
 206
 207     private void executeEventCommands(List<Event> events, CommandTagType execTime) {
 208         // no begun or ended events => exit quietly as there is nothing to do
 209         if (events.isEmpty()) {
 210             return;
 211         }
 212
 213         final ICalendarConfiguration syncConfiguration = configuration;
 214         if (syncConfiguration == null) {
 215             logger.debug("Configuration not instantiated!");
 216             return;
 217         }
 218         // loop through all events in the list
 219         for (Event event : events) {
 220
 221             // loop through all command tags in the event
 222             for (CommandTag cmdTag : event.commandTags) {
 223
 224                 // only process the BEGIN resp. END tags
 225                 if (cmdTag.getTagType() != execTime) {
 226                     continue;
 227                 }
 228                 if (!cmdTag.isAuthorized(syncConfiguration.authorizationCode)) {
 229                     logger.warn("Event: {}, Command Tag: {} => Command not authorized!", event.title,
 230                             cmdTag.getFullTag());
 231                     continue;
 232                 }
 233
 234                 final Command cmdState = cmdTag.getCommand();
 235                 if (cmdState == null) {
 236                     logger.warn("Event: {}, Command Tag: {} => Error creating Command State!", event.title,
 237                             cmdTag.getFullTag());
 238                     continue;
 239                 }
 240
 241                 // (try to) execute the command
 242                 try {
 243                     eventPublisherCallback.post(ItemEventFactory.createCommandEvent(cmdTag.getItemName(), cmdState));
 244                     if (logger.isDebugEnabled()) {
 245                         String cmdType = cmdState.getClass().toString();
 246                         int index = cmdType.lastIndexOf(".") + 1;
 247                         if ((index > 0) && (index < cmdType.length())) {
 248                             cmdType = cmdType.substring(index);
 249                         }
 250                         logger.debug("Event: {}, Command Tag: {} => {}.postUpdate({}: {})", event.title,
 251                                 cmdTag.getFullTag(), cmdTag.getItemName(), cmdType, cmdState);
 252                     }
 253                 } catch (IllegalArgumentException | IllegalStateException e) {
 254                     logger.warn("Event: {}, Command Tag: {} => Unable to push command to target item!", event.title,
 255                             cmdTag.getFullTag());
 256                     logger.debug("Exception occured while pushing to item!", e);
 257                 }
 258             }
 259         }
 260     }
 261
 262     /**
 263      * Reloads the calendar from local ical-file. Replaces the class internal calendar - if loading succeeds. Else
 264      * logging details at warn-level logger.
 265      *
 266      * @return Whether the calendar was loaded successfully.
 267      */
 268     private boolean reloadCalendar() {
 269         if (!calendarFile.isFile()) {
 270             logger.info("Local file for reloading calendar is missing.");
 271             return false;
 272         }
 273         final ICalendarConfiguration config = configuration;
 274         if (config == null) {
 275             logger.warn("Can't reload calendar when configuration is missing.");
 276             return false;
 277         }
 278         try (final FileInputStream fileStream = new FileInputStream(calendarFile)) {
 279             final AbstractPresentableCalendar calendar = AbstractPresentableCalendar.create(fileStream);
 280             runtimeCalendar = calendar;
 281             rescheduleCalendarStateUpdate();
 282             calendarDownloadedTime = Instant.ofEpochMilli(calendarFile.lastModified());
 283         } catch (IOException | CalendarException e) {
 284             logger.warn("Loading calendar failed: {}", e.getMessage());
 285             return false;
 286         }
 287         return true;
 288     }
 289
 290     /**
 291      * Reschedules the next update of the states.
 292      */
 293     private void rescheduleCalendarStateUpdate() {
 294         final ScheduledFuture<?> currentUpdateJobFuture = updateJobFuture;
 295         if (currentUpdateJobFuture != null) {
 296             if (!(currentUpdateJobFuture.isCancelled() || currentUpdateJobFuture.isDone())) {
 297                 currentUpdateJobFuture.cancel(true);
 298             }
 299             updateJobFuture = null;
 300         }
 301         final AbstractPresentableCalendar currentCalendar = runtimeCalendar;
 302         if (currentCalendar == null) {
 303             return;
 304         }
 305         final Instant now = Instant.now();
 306         if (currentCalendar.isEventPresent(now)) {
 307             final Event currentEvent = currentCalendar.getCurrentEvent(now);
 308             if (currentEvent == null) {
 309                 logger.debug(
 310                         "Could not schedule next update of states, due to unexpected behaviour of calendar implementation.");
 311                 return;
 312             }
 313             updateJobFuture = scheduler.schedule(() -> {
 314                 ICalendarHandler.this.updateStates();
 315                 ICalendarHandler.this.rescheduleCalendarStateUpdate();
 316             }, currentEvent.end.getEpochSecond() - now.getEpochSecond(), TimeUnit.SECONDS);
 317         } else {
 318             final Event nextEvent = currentCalendar.getNextEvent(now);
 319             final ICalendarConfiguration currentConfig = this.configuration;
 320             if (currentConfig == null) {
 321                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 322                         "Something is broken, the configuration is not available.");
 323                 return;
 324             }
 325             if (nextEvent == null) {
 326                 updateJobFuture = scheduler.schedule(() -> {
 327                     ICalendarHandler.this.rescheduleCalendarStateUpdate();
 328                 }, 1L, TimeUnit.DAYS);
 329             } else {
 330                 updateJobFuture = scheduler.schedule(() -> {
 331                     ICalendarHandler.this.updateStates();
 332                     ICalendarHandler.this.rescheduleCalendarStateUpdate();
 333                 }, nextEvent.start.getEpochSecond() - now.getEpochSecond(), TimeUnit.SECONDS);
 334             }
 335         }
 336     }
 337
 338     /**
 339      * Updates the states of the Thing and its channels.
 340      */
 341     private void updateStates() {
 342         final AbstractPresentableCalendar calendar = runtimeCalendar;
 343         if (calendar == null) {
 344             updateStatus(ThingStatus.OFFLINE);
 345         } else {
 346             updateStatus(ThingStatus.ONLINE);
 347
 348             final Instant now = Instant.now();
 349             if (calendar.isEventPresent(now)) {
 350                 updateState(CHANNEL_CURRENT_EVENT_PRESENT, OnOffType.ON);
 351                 final Event currentEvent = calendar.getCurrentEvent(now);
 352                 if (currentEvent == null) {
 353                     logger.warn("Unexpected inconsistency of internal API. Not Updating event details.");
 354                 } else {
 355                     updateState(CHANNEL_CURRENT_EVENT_TITLE, new StringType(currentEvent.title));
 356                     updateState(CHANNEL_CURRENT_EVENT_START,
 357                             new DateTimeType(currentEvent.start.atZone(tzProvider.getTimeZone())));
 358                     updateState(CHANNEL_CURRENT_EVENT_END,
 359                             new DateTimeType(currentEvent.end.atZone(tzProvider.getTimeZone())));
 360                 }
 361             } else {
 362                 updateState(CHANNEL_CURRENT_EVENT_PRESENT, OnOffType.OFF);
 363                 updateState(CHANNEL_CURRENT_EVENT_TITLE, UnDefType.UNDEF);
 364                 updateState(CHANNEL_CURRENT_EVENT_START, UnDefType.UNDEF);
 365                 updateState(CHANNEL_CURRENT_EVENT_END, UnDefType.UNDEF);
 366             }
 367
 368             final Event nextEvent = calendar.getNextEvent(now);
 369             if (nextEvent != null) {
 370                 updateState(CHANNEL_NEXT_EVENT_TITLE, new StringType(nextEvent.title));
 371                 updateState(CHANNEL_NEXT_EVENT_START,
 372                         new DateTimeType(nextEvent.start.atZone(tzProvider.getTimeZone())));
 373                 updateState(CHANNEL_NEXT_EVENT_END, new DateTimeType(nextEvent.end.atZone(tzProvider.getTimeZone())));
 374             } else {
 375                 updateState(CHANNEL_NEXT_EVENT_TITLE, UnDefType.UNDEF);
 376                 updateState(CHANNEL_NEXT_EVENT_START, UnDefType.UNDEF);
 377                 updateState(CHANNEL_NEXT_EVENT_END, UnDefType.UNDEF);
 378             }
 379
 380             final Instant lastUpdate = calendarDownloadedTime;
 381             updateState(CHANNEL_LAST_UPDATE,
 382                     (lastUpdate != null ? new DateTimeType(lastUpdate.atZone(tzProvider.getTimeZone()))
 383                             : UnDefType.UNDEF));
 384
 385             // process all Command Tags in all Calendar Events which ENDED since updateStates was last called
 386             // the END Event tags must be processed before the BEGIN ones
 387             executeEventCommands(calendar.getJustEndedEvents(updateStatesLastCalledTime, now), CommandTagType.END);
 388
 389             // process all Command Tags in all Calendar Events which BEGAN since updateStates was last called
 390             // the END Event tags must be processed before the BEGIN ones
 391             executeEventCommands(calendar.getJustBegunEvents(updateStatesLastCalledTime, now), CommandTagType.BEGIN);
 392
 393             // save time when updateStates was previously called
 394             // the purpose is to prevent repeat command execution of events that have already been executed
 395             updateStatesLastCalledTime = now;
 396         }
 397     }
 398
 399     /**
 400      * Updates all children of this handler.
 401      */
 402     private void updateChildren() {
 403         getThing().getThings().forEach(childThing -> updateChild(childThing.getHandler()));
 404     }
 405
 406     /**
 407      * Updates a specific child handler.
 408      *
 409      * @param childHandler the handler to be updated
 410      */
 411     private void updateChild(@Nullable ThingHandler childHandler) {
 412         if (childHandler instanceof CalendarUpdateListener) {
 413             logger.trace("Notifying {} about fresh calendar.", childHandler.getThing().getUID());
 414             try {
 415                 ((CalendarUpdateListener) childHandler).onCalendarUpdated();
 416             } catch (Exception e) {
 417                 logger.trace("The update of a child handler failed. Ignoring.", e);
 418             }
 419         }
 420     }
 421 }