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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.http.internal;
  14
  15 import java.net.MalformedURLException;
  16 import java.net.URI;
  17 import java.net.URISyntaxException;
  18 import java.util.*;
  19 import java.util.concurrent.CompletableFuture;
  20 import java.util.concurrent.TimeUnit;
  21 import java.util.function.Function;
  22
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.eclipse.jdt.annotation.Nullable;
  25 import org.eclipse.jetty.client.HttpClient;
  26 import org.eclipse.jetty.client.api.Authentication;
  27 import org.eclipse.jetty.client.api.AuthenticationStore;
  28 import org.eclipse.jetty.client.api.Request;
  29 import org.eclipse.jetty.client.util.BasicAuthentication;
  30 import org.eclipse.jetty.client.util.DigestAuthentication;
  31 import org.eclipse.jetty.client.util.StringContentProvider;
  32 import org.eclipse.jetty.http.HttpMethod;
  33 import org.openhab.binding.http.internal.config.HttpChannelConfig;
  34 import org.openhab.binding.http.internal.config.HttpChannelMode;
  35 import org.openhab.binding.http.internal.config.HttpThingConfig;
  36 import org.openhab.binding.http.internal.converter.AbstractTransformingItemConverter;
  37 import org.openhab.binding.http.internal.converter.ColorItemConverter;
  38 import org.openhab.binding.http.internal.converter.DimmerItemConverter;
  39 import org.openhab.binding.http.internal.converter.FixedValueMappingItemConverter;
  40 import org.openhab.binding.http.internal.converter.GenericItemConverter;
  41 import org.openhab.binding.http.internal.converter.ImageItemConverter;
  42 import org.openhab.binding.http.internal.converter.ItemValueConverter;
  43 import org.openhab.binding.http.internal.converter.PlayerItemConverter;
  44 import org.openhab.binding.http.internal.converter.RollershutterItemConverter;
  45 import org.openhab.binding.http.internal.http.*;
  46 import org.openhab.binding.http.internal.transform.ValueTransformationProvider;
  47 import org.openhab.core.library.types.DateTimeType;
  48 import org.openhab.core.library.types.DecimalType;
  49 import org.openhab.core.library.types.PointType;
  50 import org.openhab.core.library.types.StringType;
  51 import org.openhab.core.thing.Channel;
  52 import org.openhab.core.thing.ChannelUID;
  53 import org.openhab.core.thing.Thing;
  54 import org.openhab.core.thing.ThingStatus;
  55 import org.openhab.core.thing.ThingStatusDetail;
  56 import org.openhab.core.thing.binding.BaseThingHandler;
  57 import org.openhab.core.types.Command;
  58 import org.openhab.core.types.RefreshType;
  59 import org.openhab.core.types.State;
  60 import org.openhab.core.types.StateDescription;
  61 import org.openhab.core.types.StateDescriptionFragmentBuilder;
  62 import org.slf4j.Logger;
  63 import org.slf4j.LoggerFactory;
  64
  65 /**
  66  * The {@link HttpThingHandler} is responsible for handling commands, which are
  67  * sent to one of the channels.
  68  *
  69  * @author Jan N. Klug - Initial contribution
  70  */
  71 @NonNullByDefault
  72 public class HttpThingHandler extends BaseThingHandler {
  73     private static final Set<Character> URL_PART_DELIMITER = Set.of('/', '?', '&');
  74
  75     private final Logger logger = LoggerFactory.getLogger(HttpThingHandler.class);
  76     private final ValueTransformationProvider valueTransformationProvider;
  77     private final HttpClientProvider httpClientProvider;
  78     private HttpClient httpClient;
  79     private RateLimitedHttpClient rateLimitedHttpClient;
  80     private final HttpDynamicStateDescriptionProvider httpDynamicStateDescriptionProvider;
  81
  82     private HttpThingConfig config = new HttpThingConfig();
  83     private final Map<String, RefreshingUrlCache> urlHandlers = new HashMap<>();
  84     private final Map<ChannelUID, ItemValueConverter> channels = new HashMap<>();
  85     private final Map<ChannelUID, String> channelUrls = new HashMap<>();
  86
  87     public HttpThingHandler(Thing thing, HttpClientProvider httpClientProvider,
  88             ValueTransformationProvider valueTransformationProvider,
  89             HttpDynamicStateDescriptionProvider httpDynamicStateDescriptionProvider) {
  90         super(thing);
  91         this.httpClientProvider = httpClientProvider;
  92         this.httpClient = httpClientProvider.getSecureClient();
  93         this.rateLimitedHttpClient = new RateLimitedHttpClient(httpClient, scheduler);
  94         this.valueTransformationProvider = valueTransformationProvider;
  95         this.httpDynamicStateDescriptionProvider = httpDynamicStateDescriptionProvider;
  96     }
  97
  98     @Override
  99     public void handleCommand(ChannelUID channelUID, Command command) {
 100         ItemValueConverter itemValueConverter = channels.get(channelUID);
 101         if (itemValueConverter == null) {
 102             logger.warn("Cannot find channel implementation for channel {}.", channelUID);
 103             return;
 104         }
 105
 106         if (command instanceof RefreshType) {
 107             String stateUrl = channelUrls.get(channelUID);
 108             if (stateUrl != null) {
 109                 RefreshingUrlCache refreshingUrlCache = urlHandlers.get(stateUrl);
 110                 if (refreshingUrlCache != null) {
 111                     try {
 112                         refreshingUrlCache.get().ifPresent(itemValueConverter::process);
 113                     } catch (IllegalArgumentException | IllegalStateException e) {
 114                         logger.warn("Failed processing REFRESH command for channel {}: {}", channelUID, e.getMessage());
 115                     }
 116                 }
 117             }
 118         } else {
 119             try {
 120                 itemValueConverter.send(command);
 121             } catch (IllegalArgumentException e) {
 122                 logger.warn("Failed to convert command '{}' to channel '{}' for sending", command, channelUID);
 123             } catch (IllegalStateException e) {
 124                 logger.debug("Writing to read-only channel {} not permitted", channelUID);
 125             }
 126         }
 127     }
 128
 129     @Override
 130     public void initialize() {
 131         config = getConfigAs(HttpThingConfig.class);
 132
 133         if (config.baseURL.isEmpty()) {
 134             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 135                     "Parameter baseURL must not be empty!");
 136             return;
 137         }
 138
 139         // check SSL handling and initialize client
 140         if (config.ignoreSSLErrors) {
 141             logger.info("Using the insecure client for thing '{}'.", thing.getUID());
 142             httpClient = httpClientProvider.getInsecureClient();
 143         } else {
 144             logger.info("Using the secure client for thing '{}'.", thing.getUID());
 145             httpClient = httpClientProvider.getSecureClient();
 146         }
 147         rateLimitedHttpClient.setHttpClient(httpClient);
 148         rateLimitedHttpClient.setDelay(config.delay);
 149
 150         int channelCount = thing.getChannels().size();
 151         if (channelCount * config.delay > config.refresh * 1000) {
 152             // this should prevent the rate limit queue from filling up
 153             config.refresh = (channelCount * config.delay) / 1000 + 1;
 154             logger.warn(
 155                     "{} channels in thing {} with a delay of {} incompatible with the configured refresh time. Refresh-Time increased to the minimum of {}",
 156                     channelCount, thing.getUID(), config.delay, config.refresh);
 157         }
 158
 159         // remove empty headers
 160         config.headers.removeIf(String::isBlank);
 161
 162         // configure authentication
 163         if (!config.username.isEmpty()) {
 164             try {
 165                 AuthenticationStore authStore = httpClient.getAuthenticationStore();
 166                 URI uri = new URI(config.baseURL);
 167                 switch (config.authMode) {
 168                     case BASIC_PREEMPTIVE:
 169                         config.headers.add("Authorization=Basic " + Base64.getEncoder()
 170                                 .encodeToString((config.username + ":" + config.password).getBytes()));
 171                         logger.debug("Preemptive Basic Authentication configured for thing '{}'", thing.getUID());
 172                         break;
 173                     case BASIC:
 174                         authStore.addAuthentication(new BasicAuthentication(uri, Authentication.ANY_REALM,
 175                                 config.username, config.password));
 176                         logger.debug("Basic Authentication configured for thing '{}'", thing.getUID());
 177                         break;
 178                     case DIGEST:
 179                         authStore.addAuthentication(new DigestAuthentication(uri, Authentication.ANY_REALM,
 180                                 config.username, config.password));
 181                         logger.debug("Digest Authentication configured for thing '{}'", thing.getUID());
 182                         break;
 183                     default:
 184                         logger.warn("Unknown authentication method '{}' for thing '{}'", config.authMode,
 185                                 thing.getUID());
 186                 }
 187             } catch (URISyntaxException e) {
 188                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 189                         "failed to create authentication: baseUrl is invalid");
 190             }
 191         } else {
 192             logger.debug("No authentication configured for thing '{}'", thing.getUID());
 193         }
 194
 195         // create channels
 196         thing.getChannels().forEach(this::createChannel);
 197
 198         updateStatus(ThingStatus.ONLINE);
 199     }
 200
 201     @Override
 202     public void dispose() {
 203         // stop update tasks
 204         urlHandlers.values().forEach(RefreshingUrlCache::stop);
 205         rateLimitedHttpClient.shutdown();
 206
 207         // clear lists
 208         urlHandlers.clear();
 209         channels.clear();
 210         channelUrls.clear();
 211
 212         // remove state descriptions
 213         httpDynamicStateDescriptionProvider.removeDescriptionsForThing(thing.getUID());
 214
 215         super.dispose();
 216     }
 217
 218     /**
 219      * create all necessary information to handle every channel
 220      *
 221      * @param channel a thing channel
 222      */
 223     private void createChannel(Channel channel) {
 224         ChannelUID channelUID = channel.getUID();
 225         HttpChannelConfig channelConfig = channel.getConfiguration().as(HttpChannelConfig.class);
 226
 227         String stateUrl = concatenateUrlParts(config.baseURL, channelConfig.stateExtension);
 228         String commandUrl = channelConfig.commandExtension == null ? stateUrl
 229                 : concatenateUrlParts(config.baseURL, channelConfig.commandExtension);
 230
 231         String acceptedItemType = channel.getAcceptedItemType();
 232         if (acceptedItemType == null) {
 233             logger.warn("Cannot determine item-type for channel '{}'", channelUID);
 234             return;
 235         }
 236
 237         ItemValueConverter itemValueConverter;
 238         switch (acceptedItemType) {
 239             case "Color":
 240                 itemValueConverter = createItemConverter(ColorItemConverter::new, commandUrl, channelUID,
 241                         channelConfig);
 242                 break;
 243             case "DateTime":
 244                 itemValueConverter = createGenericItemConverter(commandUrl, channelUID, channelConfig,
 245                         DateTimeType::new);
 246                 break;
 247             case "Dimmer":
 248                 itemValueConverter = createItemConverter(DimmerItemConverter::new, commandUrl, channelUID,
 249                         channelConfig);
 250                 break;
 251             case "Contact":
 252             case "Switch":
 253                 itemValueConverter = createItemConverter(FixedValueMappingItemConverter::new, commandUrl, channelUID,
 254                         channelConfig);
 255                 break;
 256             case "Image":
 257                 itemValueConverter = new ImageItemConverter(state -> updateState(channelUID, state));
 258                 break;
 259             case "Location":
 260                 itemValueConverter = createGenericItemConverter(commandUrl, channelUID, channelConfig, PointType::new);
 261                 break;
 262             case "Number":
 263                 itemValueConverter = createGenericItemConverter(commandUrl, channelUID, channelConfig,
 264                         DecimalType::new);
 265                 break;
 266             case "Player":
 267                 itemValueConverter = createItemConverter(PlayerItemConverter::new, commandUrl, channelUID,
 268                         channelConfig);
 269                 break;
 270             case "Rollershutter":
 271                 itemValueConverter = createItemConverter(RollershutterItemConverter::new, commandUrl, channelUID,
 272                         channelConfig);
 273                 break;
 274             case "String":
 275                 itemValueConverter = createGenericItemConverter(commandUrl, channelUID, channelConfig, StringType::new);
 276                 break;
 277             default:
 278                 logger.warn("Unsupported item-type '{}'", channel.getAcceptedItemType());
 279                 return;
 280         }
 281
 282         channels.put(channelUID, itemValueConverter);
 283         if (channelConfig.mode != HttpChannelMode.WRITEONLY) {
 284             channelUrls.put(channelUID, stateUrl);
 285             urlHandlers
 286                     .computeIfAbsent(stateUrl,
 287                             url -> new RefreshingUrlCache(scheduler, rateLimitedHttpClient, url, config))
 288                     .addConsumer(itemValueConverter::process);
 289         }
 290
 291         StateDescription stateDescription = StateDescriptionFragmentBuilder.create()
 292                 .withReadOnly(channelConfig.mode == HttpChannelMode.READONLY).build().toStateDescription();
 293         if (stateDescription != null) {
 294             // if the state description is not available, we don'tneed to add it
 295             httpDynamicStateDescriptionProvider.setDescription(channelUID, stateDescription);
 296         }
 297     }
 298
 299     private void sendHttpValue(String commandUrl, String command) {
 300         sendHttpValue(commandUrl, command, false);
 301     }
 302
 303     private void sendHttpValue(String commandUrl, String command, boolean isRetry) {
 304         try {
 305             // format URL
 306             URI uri = Util.uriFromString(String.format(commandUrl, new Date(), command));
 307
 308             // build request
 309             Request request = httpClient.newRequest(uri).timeout(config.timeout, TimeUnit.MILLISECONDS)
 310                     .method(config.commandMethod);
 311             if (config.commandMethod != HttpMethod.GET) {
 312                 final String contentType = config.contentType;
 313                 if (contentType != null) {
 314                     request.content(new StringContentProvider(command), contentType);
 315                 } else {
 316                     request.content(new StringContentProvider(command));
 317                 }
 318             }
 319
 320             config.headers.forEach(header -> {
 321                 String[] keyValuePair = header.split("=", 2);
 322                 if (keyValuePair.length == 2) {
 323                     request.header(keyValuePair[0], keyValuePair[1]);
 324                 } else {
 325                     logger.warn("Splitting header '{}' failed. No '=' was found. Ignoring", header);
 326                 }
 327             });
 328
 329             if (logger.isTraceEnabled()) {
 330                 logger.trace("Sending to '{}': {}", uri, Util.requestToLogString(request));
 331             }
 332
 333             CompletableFuture<@Nullable Content> f = new CompletableFuture<>();
 334             f.exceptionally(e -> {
 335                 if (e instanceof HttpAuthException) {
 336                     if (isRetry) {
 337                         logger.warn("Retry after authentication failure failed again for '{}', failing here", uri);
 338                     } else {
 339                         AuthenticationStore authStore = httpClient.getAuthenticationStore();
 340                         Authentication.Result authResult = authStore.findAuthenticationResult(uri);
 341                         if (authResult != null) {
 342                             authStore.removeAuthenticationResult(authResult);
 343                             logger.debug("Cleared authentication result for '{}', retrying immediately", uri);
 344                             sendHttpValue(commandUrl, command, true);
 345                         } else {
 346                             logger.warn("Could not find authentication result for '{}', failing here", uri);
 347                         }
 348                     }
 349                 }
 350                 return null;
 351             });
 352             request.send(new HttpResponseListener(f, null, config.bufferSize));
 353         } catch (IllegalArgumentException | URISyntaxException | MalformedURLException e) {
 354             logger.warn("Creating request for '{}' failed: {}", commandUrl, e.getMessage());
 355         }
 356     }
 357
 358     private String concatenateUrlParts(String baseUrl, @Nullable String extension) {
 359         if (extension != null && !extension.isEmpty()) {
 360             if (!URL_PART_DELIMITER.contains(baseUrl.charAt(baseUrl.length() - 1))
 361                     && !URL_PART_DELIMITER.contains(extension.charAt(0))) {
 362                 return baseUrl + "/" + extension;
 363             } else {
 364                 return baseUrl + extension;
 365             }
 366         } else {
 367             return baseUrl;
 368         }
 369     }
 370
 371     private ItemValueConverter createItemConverter(AbstractTransformingItemConverter.Factory factory, String commandUrl,
 372             ChannelUID channelUID, HttpChannelConfig channelConfig) {
 373         return factory.create(state -> updateState(channelUID, state), command -> postCommand(channelUID, command),
 374                 command -> sendHttpValue(commandUrl, command),
 375                 valueTransformationProvider.getValueTransformation(channelConfig.stateTransformation),
 376                 valueTransformationProvider.getValueTransformation(channelConfig.commandTransformation), channelConfig);
 377     }
 378
 379     private ItemValueConverter createGenericItemConverter(String commandUrl, ChannelUID channelUID,
 380             HttpChannelConfig channelConfig, Function<String, State> toState) {
 381         AbstractTransformingItemConverter.Factory factory = (state, command, value, stateTrans, commandTrans,
 382                 config) -> new GenericItemConverter(toState, state, command, value, stateTrans, commandTrans, config);
 383         return createItemConverter(factory, commandUrl, channelUID, channelConfig);
 384     }
 385 }