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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.thing.binding.builder.ChannelBuilder;
  53 import org.openhab.core.thing.binding.builder.ThingBuilder;
  54 import org.openhab.core.types.Command;
  55 import org.openhab.core.types.RefreshType;
  56 import org.openhab.core.types.UnDefType;
  57 import org.slf4j.Logger;
  58 import org.slf4j.LoggerFactory;
  59
  60 /**
  61  * The {@link ICalendarHandler} is responsible for handling commands, which are
  62  * sent to one of the channels.
  63  *
  64  * @author Michael Wodniok - Initial contribution
  65  * @author Andrew Fiddian-Green - Support for Command Tags embedded in the Event description
  66  * @author Michael Wodniok - Added last_update-channel and additional needed handling of it
  67  */
  68 @NonNullByDefault
  69 public class ICalendarHandler extends BaseBridgeHandler implements CalendarUpdateListener {
  70
  71     private final File calendarFile;
  72     private @Nullable ICalendarConfiguration configuration;
  73     private final EventPublisher eventPublisherCallback;
  74     private final HttpClient httpClient;
  75     private final Logger logger = LoggerFactory.getLogger(ICalendarHandler.class);
  76     private final TimeZoneProvider tzProvider;
  77     private @Nullable ScheduledFuture<?> pullJobFuture;
  78     private @Nullable AbstractPresentableCalendar runtimeCalendar;
  79     private @Nullable ScheduledFuture<?> updateJobFuture;
  80     private Instant updateStatesLastCalledTime;
  81     private @Nullable Instant calendarDownloadedTime;
  82
  83     public ICalendarHandler(Bridge bridge, HttpClient httpClient, EventPublisher eventPublisher,
  84             TimeZoneProvider tzProvider) {
  85         super(bridge);
  86         this.httpClient = httpClient;
  87         calendarFile = new File(OpenHAB.getUserDataFolder() + File.separator
  88                 + getThing().getUID().getAsString().replaceAll("[<>:\"/\\\\|?*]", "_") + ".ical");
  89         eventPublisherCallback = eventPublisher;
  90         updateStatesLastCalledTime = Instant.now();
  91         this.tzProvider = tzProvider;
  92     }
  93
  94     @Override
  95     public void dispose() {
  96         final ScheduledFuture<?> currentUpdateJobFuture = updateJobFuture;
  97         if (currentUpdateJobFuture != null) {
  98             currentUpdateJobFuture.cancel(true);
  99         }
 100         final ScheduledFuture<?> currentPullJobFuture = pullJobFuture;
 101         if (currentPullJobFuture != null) {
 102             currentPullJobFuture.cancel(true);
 103         }
 104     }
 105
 106     @Override
 107     public void handleCommand(ChannelUID channelUID, Command command) {
 108         switch (channelUID.getId()) {
 109             case CHANNEL_CURRENT_EVENT_PRESENT:
 110             case CHANNEL_CURRENT_EVENT_TITLE:
 111             case CHANNEL_CURRENT_EVENT_START:
 112             case CHANNEL_CURRENT_EVENT_END:
 113             case CHANNEL_NEXT_EVENT_TITLE:
 114             case CHANNEL_NEXT_EVENT_START:
 115             case CHANNEL_NEXT_EVENT_END:
 116             case CHANNEL_LAST_UPDATE:
 117                 if (command instanceof RefreshType) {
 118                     updateStates();
 119                 }
 120                 break;
 121             default:
 122                 logger.warn("Framework sent command to unknown channel with id '{}'", channelUID.getId());
 123         }
 124     }
 125
 126     @Override
 127     public void initialize() {
 128         migrateLastUpdateChannel();
 129
 130         final ICalendarConfiguration currentConfiguration = getConfigAs(ICalendarConfiguration.class);
 131         configuration = currentConfiguration;
 132
 133         try {
 134             if ((currentConfiguration.username == null && currentConfiguration.password != null)
 135                     || (currentConfiguration.username != null && currentConfiguration.password == null)) {
 136                 throw new ConfigBrokenException("Only one of username and password was set. This is invalid.");
 137             }
 138
 139             PullJob regularPull;
 140             final BigDecimal maxSizeBD = currentConfiguration.maxSize;
 141             if (maxSizeBD == null || maxSizeBD.intValue() < 1) {
 142                 throw new ConfigBrokenException(
 143                         "maxSize is either not set or less than 1 (mebibyte), which is not allowed.");
 144             }
 145             final int maxSize = maxSizeBD.intValue();
 146             try {
 147                 regularPull = new PullJob(httpClient, new URI(currentConfiguration.url), currentConfiguration.username,
 148                         currentConfiguration.password, calendarFile, maxSize * 1048576, this);
 149             } catch (URISyntaxException e) {
 150                 throw new ConfigBrokenException(String.format(
 151                         "The URI '%s' for downloading the calendar contains syntax errors.", currentConfiguration.url));
 152
 153             }
 154
 155             final BigDecimal refreshTimeBD = currentConfiguration.refreshTime;
 156             if (refreshTimeBD == null || refreshTimeBD.longValue() < 1) {
 157                 throw new ConfigBrokenException(
 158                         "refreshTime is either not set or less than 1 (minute), which is not allowed.");
 159             }
 160             final long refreshTime = refreshTimeBD.longValue();
 161             if (calendarFile.isFile()) {
 162                 updateStatus(ThingStatus.ONLINE);
 163
 164                 scheduler.submit(() -> {
 165                     // reload calendar file asynchronously
 166                     if (reloadCalendar()) {
 167                         updateStates();
 168                         updateChildren();
 169                     } else {
 170                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 171                                 "The calendar seems to be configured correctly, but the local copy of calendar could not be loaded.");
 172                     }
 173                 });
 174                 pullJobFuture = scheduler.scheduleWithFixedDelay(regularPull, refreshTime, refreshTime,
 175                         TimeUnit.MINUTES);
 176             } else {
 177                 updateStatus(ThingStatus.OFFLINE);
 178                 logger.debug(
 179                         "The calendar is currently offline as no local copy exists. It will go online as soon as a valid valid calendar is retrieved.");
 180                 pullJobFuture = scheduler.scheduleWithFixedDelay(regularPull, 0, refreshTime, TimeUnit.MINUTES);
 181             }
 182         } catch (ConfigBrokenException e) {
 183             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, e.getMessage());
 184         }
 185     }
 186
 187     @Override
 188     public void childHandlerInitialized(ThingHandler childHandler, Thing childThing) {
 189         final AbstractPresentableCalendar calendar = runtimeCalendar;
 190         if (calendar != null) {
 191             updateChild(childHandler);
 192         }
 193     }
 194
 195     @Override
 196     public void onCalendarUpdated() {
 197         if (reloadCalendar()) {
 198             updateStates();
 199             updateChildren();
 200         } else {
 201             logger.trace("Calendar was updated, but loading failed.");
 202         }
 203     }
 204
 205     /**
 206      * @return the calendar that is used for all operations
 207      */
 208     @Nullable
 209     public AbstractPresentableCalendar getRuntimeCalendar() {
 210         return runtimeCalendar;
 211     }
 212
 213     private void executeEventCommands(List<Event> events, CommandTagType execTime) {
 214         // no begun or ended events => exit quietly as there is nothing to do
 215         if (events.isEmpty()) {
 216             return;
 217         }
 218
 219         final ICalendarConfiguration syncConfiguration = configuration;
 220         if (syncConfiguration == null) {
 221             logger.debug("Configuration not instantiated!");
 222             return;
 223         }
 224         // loop through all events in the list
 225         for (Event event : events) {
 226
 227             // loop through all command tags in the event
 228             for (CommandTag cmdTag : event.commandTags) {
 229
 230                 // only process the BEGIN resp. END tags
 231                 if (cmdTag.getTagType() != execTime) {
 232                     continue;
 233                 }
 234                 if (!cmdTag.isAuthorized(syncConfiguration.authorizationCode)) {
 235                     logger.warn("Event: {}, Command Tag: {} => Command not authorized!", event.title,
 236                             cmdTag.getFullTag());
 237                     continue;
 238                 }
 239
 240                 final Command cmdState = cmdTag.getCommand();
 241                 if (cmdState == null) {
 242                     logger.warn("Event: {}, Command Tag: {} => Error creating Command State!", event.title,
 243                             cmdTag.getFullTag());
 244                     continue;
 245                 }
 246
 247                 // (try to) execute the command
 248                 try {
 249                     eventPublisherCallback.post(ItemEventFactory.createCommandEvent(cmdTag.getItemName(), cmdState));
 250                     if (logger.isDebugEnabled()) {
 251                         String cmdType = cmdState.getClass().toString();
 252                         int index = cmdType.lastIndexOf(".") + 1;
 253                         if ((index > 0) && (index < cmdType.length())) {
 254                             cmdType = cmdType.substring(index);
 255                         }
 256                         logger.debug("Event: {}, Command Tag: {} => {}.postUpdate({}: {})", event.title,
 257                                 cmdTag.getFullTag(), cmdTag.getItemName(), cmdType, cmdState);
 258                     }
 259                 } catch (IllegalArgumentException | IllegalStateException e) {
 260                     logger.warn("Event: {}, Command Tag: {} => Unable to push command to target item!", event.title,
 261                             cmdTag.getFullTag());
 262                     logger.debug("Exception occured while pushing to item!", e);
 263                 }
 264             }
 265         }
 266     }
 267
 268     /**
 269      * Migration for last_update-channel as this change is compatible to previous instances.
 270      */
 271     private void migrateLastUpdateChannel() {
 272         Thing thing = getThing();
 273         if (thing.getChannel(CHANNEL_LAST_UPDATE) == null) {
 274             logger.debug("last_update channel is missing in this Thing. Adding it.");
 275             ThingBuilder thingBuilder = editThing();
 276             ChannelBuilder channelBuilder = ChannelBuilder.create(new ChannelUID(thing.getUID(), CHANNEL_LAST_UPDATE));
 277             thingBuilder.withChannel(channelBuilder.withType(LAST_UPDATE_TYPE_UID).build());
 278             updateThing(thingBuilder.build());
 279         }
 280     }
 281
 282     /**
 283      * Reloads the calendar from local ical-file. Replaces the class internal calendar - if loading succeeds. Else
 284      * logging details at warn-level logger.
 285      *
 286      * @return Whether the calendar was loaded successfully.
 287      */
 288     private boolean reloadCalendar() {
 289         logger.trace("reloading calendar of {}", getThing().getUID());
 290         if (!calendarFile.isFile()) {
 291             logger.info("Local file for reloading calendar is missing.");
 292             return false;
 293         }
 294         final ICalendarConfiguration config = configuration;
 295         if (config == null) {
 296             logger.warn("Can't reload calendar when configuration is missing.");
 297             return false;
 298         }
 299         try (final FileInputStream fileStream = new FileInputStream(calendarFile)) {
 300             final AbstractPresentableCalendar calendar = AbstractPresentableCalendar.create(fileStream);
 301             runtimeCalendar = calendar;
 302             rescheduleCalendarStateUpdate();
 303             calendarDownloadedTime = Instant.ofEpochMilli(calendarFile.lastModified());
 304         } catch (IOException | CalendarException e) {
 305             logger.warn("Loading calendar failed: {}", e.getMessage());
 306             return false;
 307         }
 308         return true;
 309     }
 310
 311     /**
 312      * Reschedules the next update of the states.
 313      */
 314     private void rescheduleCalendarStateUpdate() {
 315         final ScheduledFuture<?> currentUpdateJobFuture = updateJobFuture;
 316         if (currentUpdateJobFuture != null) {
 317             if (!(currentUpdateJobFuture.isCancelled() || currentUpdateJobFuture.isDone())) {
 318                 currentUpdateJobFuture.cancel(true);
 319             }
 320             updateJobFuture = null;
 321         }
 322         final AbstractPresentableCalendar currentCalendar = runtimeCalendar;
 323         if (currentCalendar == null) {
 324             return;
 325         }
 326         final Instant now = Instant.now();
 327         if (currentCalendar.isEventPresent(now)) {
 328             final Event currentEvent = currentCalendar.getCurrentEvent(now);
 329             if (currentEvent == null) {
 330                 logger.debug(
 331                         "Could not schedule next update of states, due to unexpected behaviour of calendar implementation.");
 332                 return;
 333             }
 334             updateJobFuture = scheduler.schedule(() -> {
 335                 ICalendarHandler.this.updateStates();
 336                 ICalendarHandler.this.rescheduleCalendarStateUpdate();
 337             }, currentEvent.end.getEpochSecond() - now.getEpochSecond(), TimeUnit.SECONDS);
 338             logger.debug("Scheduled update in {} seconds", currentEvent.end.getEpochSecond() - now.getEpochSecond());
 339         } else {
 340             final Event nextEvent = currentCalendar.getNextEvent(now);
 341             final ICalendarConfiguration currentConfig = this.configuration;
 342             if (currentConfig == null) {
 343                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 344                         "Something is broken, the configuration is not available.");
 345                 return;
 346             }
 347             if (nextEvent == null) {
 348                 updateJobFuture = scheduler.schedule(() -> {
 349                     ICalendarHandler.this.rescheduleCalendarStateUpdate();
 350                 }, 1L, TimeUnit.DAYS);
 351                 logger.debug("Scheduled reschedule in 1 day");
 352             } else {
 353                 updateJobFuture = scheduler.schedule(() -> {
 354                     ICalendarHandler.this.updateStates();
 355                     ICalendarHandler.this.rescheduleCalendarStateUpdate();
 356                 }, nextEvent.start.getEpochSecond() - now.getEpochSecond(), TimeUnit.SECONDS);
 357                 logger.debug("Scheduled update in {} seconds", nextEvent.start.getEpochSecond() - now.getEpochSecond());
 358
 359             }
 360         }
 361     }
 362
 363     /**
 364      * Updates the states of the Thing and its channels.
 365      */
 366     private void updateStates() {
 367         logger.trace("updating states of {}", getThing().getUID());
 368         final AbstractPresentableCalendar calendar = runtimeCalendar;
 369         if (calendar == null) {
 370             updateStatus(ThingStatus.OFFLINE);
 371         } else {
 372             updateStatus(ThingStatus.ONLINE);
 373
 374             final Instant now = Instant.now();
 375             if (calendar.isEventPresent(now)) {
 376                 updateState(CHANNEL_CURRENT_EVENT_PRESENT, OnOffType.ON);
 377                 final Event currentEvent = calendar.getCurrentEvent(now);
 378                 if (currentEvent == null) {
 379                     logger.warn("Unexpected inconsistency of internal API. Not Updating event details.");
 380                 } else {
 381                     updateState(CHANNEL_CURRENT_EVENT_TITLE, new StringType(currentEvent.title));
 382                     updateState(CHANNEL_CURRENT_EVENT_START,
 383                             new DateTimeType(currentEvent.start.atZone(tzProvider.getTimeZone())));
 384                     updateState(CHANNEL_CURRENT_EVENT_END,
 385                             new DateTimeType(currentEvent.end.atZone(tzProvider.getTimeZone())));
 386                 }
 387             } else {
 388                 updateState(CHANNEL_CURRENT_EVENT_PRESENT, OnOffType.OFF);
 389                 updateState(CHANNEL_CURRENT_EVENT_TITLE, UnDefType.UNDEF);
 390                 updateState(CHANNEL_CURRENT_EVENT_START, UnDefType.UNDEF);
 391                 updateState(CHANNEL_CURRENT_EVENT_END, UnDefType.UNDEF);
 392             }
 393
 394             final Event nextEvent = calendar.getNextEvent(now);
 395             if (nextEvent != null) {
 396                 updateState(CHANNEL_NEXT_EVENT_TITLE, new StringType(nextEvent.title));
 397                 updateState(CHANNEL_NEXT_EVENT_START,
 398                         new DateTimeType(nextEvent.start.atZone(tzProvider.getTimeZone())));
 399                 updateState(CHANNEL_NEXT_EVENT_END, new DateTimeType(nextEvent.end.atZone(tzProvider.getTimeZone())));
 400             } else {
 401                 updateState(CHANNEL_NEXT_EVENT_TITLE, UnDefType.UNDEF);
 402                 updateState(CHANNEL_NEXT_EVENT_START, UnDefType.UNDEF);
 403                 updateState(CHANNEL_NEXT_EVENT_END, UnDefType.UNDEF);
 404             }
 405
 406             final Instant lastUpdate = calendarDownloadedTime;
 407             updateState(CHANNEL_LAST_UPDATE,
 408                     (lastUpdate != null ? new DateTimeType(lastUpdate.atZone(tzProvider.getTimeZone()))
 409                             : UnDefType.UNDEF));
 410
 411             // process all Command Tags in all Calendar Events which ENDED since updateStates was last called
 412             // the END Event tags must be processed before the BEGIN ones
 413             executeEventCommands(calendar.getJustEndedEvents(updateStatesLastCalledTime, now), CommandTagType.END);
 414
 415             // process all Command Tags in all Calendar Events which BEGAN since updateStates was last called
 416             // the END Event tags must be processed before the BEGIN ones
 417             executeEventCommands(calendar.getJustBegunEvents(updateStatesLastCalledTime, now), CommandTagType.BEGIN);
 418
 419             // save time when updateStates was previously called
 420             // the purpose is to prevent repeat command execution of events that have already been executed
 421             updateStatesLastCalledTime = now;
 422         }
 423     }
 424
 425     /**
 426      * Updates all children of this handler.
 427      */
 428     private void updateChildren() {
 429         getThing().getThings().forEach(childThing -> updateChild(childThing.getHandler()));
 430     }
 431
 432     /**
 433      * Updates a specific child handler.
 434      *
 435      * @param childHandler the handler to be updated
 436      */
 437     private void updateChild(@Nullable ThingHandler childHandler) {
 438         if (childHandler instanceof CalendarUpdateListener) {
 439             logger.trace("Notifying {} about fresh calendar.", childHandler.getThing().getUID());
 440             try {
 441                 ((CalendarUpdateListener) childHandler).onCalendarUpdated();
 442             } catch (Exception e) {
 443                 logger.trace("The update of a child handler failed. Ignoring.", e);
 444             }
 445         }
 446     }
 447 }