src/main/java/net/pterodactylus/sone/core/FreenetInterface.java

   1 /*
   2  * Sone - FreenetInterface.java - Copyright © 2010–2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.core;
  19
  20 import static net.pterodactylus.sone.data.Sone.TO_FREENET_URI;
  21
  22 import java.net.MalformedURLException;
  23 import java.util.Collections;
  24 import java.util.HashMap;
  25 import java.util.Map;
  26 import java.util.concurrent.TimeUnit;
  27 import java.util.logging.Level;
  28 import java.util.logging.Logger;
  29
  30 import net.pterodactylus.sone.core.event.ImageInsertAbortedEvent;
  31 import net.pterodactylus.sone.core.event.ImageInsertFailedEvent;
  32 import net.pterodactylus.sone.core.event.ImageInsertFinishedEvent;
  33 import net.pterodactylus.sone.core.event.ImageInsertStartedEvent;
  34 import net.pterodactylus.sone.data.Image;
  35 import net.pterodactylus.sone.data.Sone;
  36 import net.pterodactylus.sone.data.TemporaryImage;
  37 import net.pterodactylus.util.logging.Logging;
  38
  39 import com.db4o.ObjectContainer;
  40 import com.google.common.annotations.VisibleForTesting;
  41 import com.google.common.eventbus.EventBus;
  42 import com.google.inject.Inject;
  43 import freenet.client.ClientMetadata;
  44 import freenet.client.FetchException;
  45 import freenet.client.FetchResult;
  46 import freenet.client.HighLevelSimpleClient;
  47 import freenet.client.HighLevelSimpleClientImpl;
  48 import freenet.client.InsertBlock;
  49 import freenet.client.InsertContext;
  50 import freenet.client.InsertException;
  51 import freenet.client.async.BaseClientPutter;
  52 import freenet.client.async.ClientContext;
  53 import freenet.client.async.ClientPutCallback;
  54 import freenet.client.async.ClientPutter;
  55 import freenet.client.async.USKCallback;
  56 import freenet.client.async.USKManager;
  57 import freenet.keys.FreenetURI;
  58 import freenet.keys.InsertableClientSSK;
  59 import freenet.keys.USK;
  60 import freenet.node.Node;
  61 import freenet.node.RequestClient;
  62 import freenet.node.RequestStarter;
  63 import freenet.support.api.Bucket;
  64 import freenet.support.io.ArrayBucket;
  65
  66 /**
  67  * Contains all necessary functionality for interacting with the Freenet node.
  68  *
  69  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  70  */
  71 public class FreenetInterface {
  72
  73         /** The logger. */
  74         private static final Logger logger = Logging.getLogger(FreenetInterface.class);
  75
  76         /** The event bus. */
  77         private final EventBus eventBus;
  78
  79         /** The node to interact with. */
  80         private final Node node;
  81
  82         /** The high-level client to use for requests. */
  83         private final HighLevelSimpleClient client;
  84         private final RequestClient requestClient;
  85
  86         /** The USK callbacks. */
  87         private final Map<String, USKCallback> soneUskCallbacks = new HashMap<String, USKCallback>();
  88
  89         /** The not-Sone-related USK callbacks. */
  90         private final Map<FreenetURI, USKCallback> uriUskCallbacks = Collections.synchronizedMap(new HashMap<FreenetURI, USKCallback>());
  91         private USKManager uskManager;
  92
  93         /**
  94          * Creates a new Freenet interface.
  95          *
  96          * @param eventBus
  97          *            The event bus
  98          * @param node
  99          *            The node to interact with
 100          */
 101         @Inject
 102         public FreenetInterface(EventBus eventBus, Node node) {
 103                 this.eventBus = eventBus;
 104                 this.node = node;
 105                 this.client = node.clientCore.makeClient(RequestStarter.INTERACTIVE_PRIORITY_CLASS, false, true);
 106                 this.requestClient = (HighLevelSimpleClientImpl) client;
 107                 this.uskManager = node.clientCore.uskManager;
 108         }
 109
 110         @VisibleForTesting
 111         public FreenetInterface(EventBus eventBus, Node node, HighLevelSimpleClient highLevelSimpleClient, RequestClient requestClient, USKManager uskManager) {
 112                 this.eventBus = eventBus;
 113                 this.node = node;
 114                 this.client = highLevelSimpleClient;
 115                 this.requestClient = requestClient;
 116                 this.uskManager = uskManager;
 117         }
 118
 119         //
 120         // ACTIONS
 121         //
 122
 123         /**
 124          * Fetches the given URI.
 125          *
 126          * @param uri
 127          *            The URI to fetch
 128          * @return The result of the fetch, or {@code null} if an error occured
 129          */
 130         public Fetched fetchUri(FreenetURI uri) {
 131                 FetchResult fetchResult = null;
 132                 FreenetURI currentUri = new FreenetURI(uri);
 133                 while (true) {
 134                         try {
 135                                 fetchResult = client.fetch(currentUri);
 136                                 return new Fetched(currentUri, fetchResult);
 137                         } catch (FetchException fe1) {
 138                                 if (fe1.getMode() == FetchException.PERMANENT_REDIRECT) {
 139                                         currentUri = fe1.newURI;
 140                                         continue;
 141                                 }
 142                                 logger.log(Level.WARNING, String.format("Could not fetch “%s”!", uri), fe1);
 143                                 return null;
 144                         }
 145                 }
 146         }
 147
 148         /**
 149          * Creates a key pair.
 150          *
 151          * @return The request key at index 0, the insert key at index 1
 152          */
 153         public String[] generateKeyPair() {
 154                 FreenetURI[] keyPair = client.generateKeyPair("");
 155                 return new String[] { keyPair[1].toString(), keyPair[0].toString() };
 156         }
 157
 158         /**
 159          * Inserts the image data of the given {@link TemporaryImage} and returns
 160          * the given insert token that can be used to add listeners or cancel the
 161          * insert.
 162          *
 163          * @param temporaryImage
 164          *            The temporary image data
 165          * @param image
 166          *            The image
 167          * @param insertToken
 168          *            The insert token
 169          * @throws SoneException
 170          *             if the insert could not be started
 171          */
 172         public void insertImage(TemporaryImage temporaryImage, Image image, InsertToken insertToken) throws SoneException {
 173                 String filenameHint = image.getId() + "." + temporaryImage.getMimeType().substring(temporaryImage.getMimeType().lastIndexOf("/") + 1);
 174                 InsertableClientSSK key = InsertableClientSSK.createRandom(node.random, "");
 175                 FreenetURI targetUri = key.getInsertURI().setDocName(filenameHint);
 176                 InsertContext insertContext = client.getInsertContext(true);
 177                 Bucket bucket = new ArrayBucket(temporaryImage.getImageData());
 178                 ClientMetadata metadata = new ClientMetadata(temporaryImage.getMimeType());
 179                 InsertBlock insertBlock = new InsertBlock(bucket, metadata, targetUri);
 180                 try {
 181                         ClientPutter clientPutter = client.insert(insertBlock, false, null, false, insertContext, insertToken, RequestStarter.INTERACTIVE_PRIORITY_CLASS);
 182                         insertToken.setClientPutter(clientPutter);
 183                 } catch (InsertException ie1) {
 184                         throw new SoneInsertException("Could not start image insert.", ie1);
 185                 }
 186         }
 187
 188         /**
 189          * Inserts a directory into Freenet.
 190          *
 191          * @param insertUri
 192          *            The insert URI
 193          * @param manifestEntries
 194          *            The directory entries
 195          * @param defaultFile
 196          *            The name of the default file
 197          * @return The generated URI
 198          * @throws SoneException
 199          *             if an insert error occurs
 200          */
 201         public FreenetURI insertDirectory(FreenetURI insertUri, HashMap<String, Object> manifestEntries, String defaultFile) throws SoneException {
 202                 try {
 203                         return client.insertManifest(insertUri, manifestEntries, defaultFile);
 204                 } catch (InsertException ie1) {
 205                         throw new SoneException(ie1);
 206                 }
 207         }
 208
 209         /**
 210          * Registers the USK for the given Sone and notifies the given
 211          * {@link SoneDownloader} if an update was found.
 212          *
 213          * @param sone
 214          *            The Sone to watch
 215          * @param soneDownloader
 216          *            The Sone download to notify on updates
 217          */
 218         public void registerUsk(final Sone sone, final SoneDownloader soneDownloader) {
 219                 try {
 220                         logger.log(Level.FINE, String.format("Registering Sone “%s” for USK updates at %s…", sone, TO_FREENET_URI.apply(sone).setMetaString(new String[]{"sone.xml"})));
 221                         USKCallback uskCallback = new USKCallback() {
 222
 223                                 @Override
 224                                 @SuppressWarnings("synthetic-access")
 225                                 public void onFoundEdition(long edition, USK key, ObjectContainer objectContainer, ClientContext clientContext, boolean metadata, short codec, byte[] data, boolean newKnownGood, boolean newSlotToo) {
 226                                         logger.log(Level.FINE, String.format("Found USK update for Sone “%s” at %s, new known good: %s, new slot too: %s.", sone, key, newKnownGood, newSlotToo));
 227                                         if (edition > sone.getLatestEdition()) {
 228                                                 sone.modify().setLatestEdition(edition).update();
 229                                                 new Thread(new Runnable() {
 230
 231                                                         @Override
 232                                                         public void run() {
 233                                                                 soneDownloader.fetchSone(sone);
 234                                                         }
 235                                                 }, "Sone Downloader").start();
 236                                         }
 237                                 }
 238
 239                                 @Override
 240                                 public short getPollingPriorityProgress() {
 241                                         return RequestStarter.INTERACTIVE_PRIORITY_CLASS;
 242                                 }
 243
 244                                 @Override
 245                                 public short getPollingPriorityNormal() {
 246                                         return RequestStarter.INTERACTIVE_PRIORITY_CLASS;
 247                                 }
 248                         };
 249                         soneUskCallbacks.put(sone.getId(), uskCallback);
 250                         boolean runBackgroundFetch = (System.currentTimeMillis() - sone.getTime()) < TimeUnit.DAYS.toMillis(7);
 251                         uskManager.subscribe(USK.create(TO_FREENET_URI.apply(sone)), uskCallback, runBackgroundFetch, requestClient);
 252                 } catch (MalformedURLException mue1) {
 253                         logger.log(Level.WARNING, String.format("Could not subscribe USK “%s”!", TO_FREENET_URI.apply(sone)), mue1);
 254                 }
 255         }
 256
 257         /**
 258          * Unsubscribes the request URI of the given Sone.
 259          *
 260          * @param sone
 261          *            The Sone to unregister
 262          */
 263         public void unregisterUsk(Sone sone) {
 264                 USKCallback uskCallback = soneUskCallbacks.remove(sone.getId());
 265                 if (uskCallback == null) {
 266                         return;
 267                 }
 268                 try {
 269                         logger.log(Level.FINEST, String.format("Unsubscribing from USK for %s…", sone));
 270                         uskManager.unsubscribe(USK.create(TO_FREENET_URI.apply(sone)), uskCallback);
 271                 } catch (MalformedURLException mue1) {
 272                         logger.log(Level.FINE, String.format("Could not unsubscribe USK “%s”!", TO_FREENET_URI.apply(sone)), mue1);
 273                 }
 274         }
 275
 276         /**
 277          * Registers an arbitrary URI and calls the given callback if a new edition
 278          * is found.
 279          *
 280          * @param uri
 281          *            The URI to watch
 282          * @param callback
 283          *            The callback to call
 284          */
 285         public void registerUsk(FreenetURI uri, final Callback callback) {
 286                 USKCallback uskCallback = new USKCallback() {
 287
 288                         @Override
 289                         public void onFoundEdition(long edition, USK key, ObjectContainer objectContainer, ClientContext clientContext, boolean metadata, short codec, byte[] data, boolean newKnownGood, boolean newSlotToo) {
 290                                 callback.editionFound(key.getURI(), edition, newKnownGood, newSlotToo);
 291                         }
 292
 293                         @Override
 294                         public short getPollingPriorityNormal() {
 295                                 return RequestStarter.PREFETCH_PRIORITY_CLASS;
 296                         }
 297
 298                         @Override
 299                         public short getPollingPriorityProgress() {
 300                                 return RequestStarter.INTERACTIVE_PRIORITY_CLASS;
 301                         }
 302
 303                 };
 304                 try {
 305                         uskManager.subscribe(USK.create(uri), uskCallback, true, requestClient);
 306                         uriUskCallbacks.put(uri, uskCallback);
 307                 } catch (MalformedURLException mue1) {
 308                         logger.log(Level.WARNING, String.format("Could not subscribe to USK: %s", uri), mue1);
 309                 }
 310         }
 311
 312         /**
 313          * Unregisters the USK watcher for the given URI.
 314          *
 315          * @param uri
 316          *            The URI to unregister the USK watcher for
 317          */
 318         public void unregisterUsk(FreenetURI uri) {
 319                 USKCallback uskCallback = uriUskCallbacks.remove(uri);
 320                 if (uskCallback == null) {
 321                         logger.log(Level.INFO, String.format("Could not unregister unknown USK: %s", uri));
 322                         return;
 323                 }
 324                 try {
 325                         uskManager.unsubscribe(USK.create(uri), uskCallback);
 326                 } catch (MalformedURLException mue1) {
 327                         logger.log(Level.INFO, String.format("Could not unregister invalid USK: %s", uri), mue1);
 328                 }
 329         }
 330
 331         /**
 332          * Container for a fetched URI and the {@link FetchResult}.
 333          *
 334          * @author <a href="mailto:d.roden@xplosion.de">David Roden</a>
 335          */
 336         public static class Fetched {
 337
 338                 /** The fetched URI. */
 339                 private final FreenetURI freenetUri;
 340
 341                 /** The fetch result. */
 342                 private final FetchResult fetchResult;
 343
 344                 /**
 345                  * Creates a new fetched URI.
 346                  *
 347                  * @param freenetUri
 348                  *            The URI that was fetched
 349                  * @param fetchResult
 350                  *            The fetch result
 351                  */
 352                 public Fetched(FreenetURI freenetUri, FetchResult fetchResult) {
 353                         this.freenetUri = freenetUri;
 354                         this.fetchResult = fetchResult;
 355                 }
 356
 357                 //
 358                 // ACCESSORS
 359                 //
 360
 361                 /**
 362                  * Returns the fetched URI.
 363                  *
 364                  * @return The fetched URI
 365                  */
 366                 public FreenetURI getFreenetUri() {
 367                         return freenetUri;
 368                 }
 369
 370                 /**
 371                  * Returns the fetch result.
 372                  *
 373                  * @return The fetch result
 374                  */
 375                 public FetchResult getFetchResult() {
 376                         return fetchResult;
 377                 }
 378
 379         }
 380
 381         /**
 382          * Callback for USK watcher events.
 383          *
 384          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 385          */
 386         public static interface Callback {
 387
 388                 /**
 389                  * Notifies a listener that a new edition was found for a URI.
 390                  *
 391                  * @param uri
 392                  *            The URI that a new edition was found for
 393                  * @param edition
 394                  *            The found edition
 395                  * @param newKnownGood
 396                  *            Whether the found edition was actually fetched
 397                  * @param newSlot
 398                  *            Whether the found edition is higher than all previously
 399                  *            found editions
 400                  */
 401                 public void editionFound(FreenetURI uri, long edition, boolean newKnownGood, boolean newSlot);
 402
 403         }
 404
 405         /**
 406          * Insert token that can cancel a running insert and sends events.
 407          *
 408          * @see ImageInsertAbortedEvent
 409          * @see ImageInsertStartedEvent
 410          * @see ImageInsertFailedEvent
 411          * @see ImageInsertFinishedEvent
 412          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 413          */
 414         public class InsertToken implements ClientPutCallback {
 415
 416                 /** The image being inserted. */
 417                 private final Image image;
 418
 419                 /** The client putter. */
 420                 private ClientPutter clientPutter;
 421
 422                 /** The final URI. */
 423                 private volatile FreenetURI resultingUri;
 424
 425                 /**
 426                  * Creates a new insert token for the given image.
 427                  *
 428                  * @param image
 429                  *            The image being inserted
 430                  */
 431                 public InsertToken(Image image) {
 432                         this.image = image;
 433                 }
 434
 435                 //
 436                 // ACCESSORS
 437                 //
 438
 439                 /**
 440                  * Sets the client putter that is inserting the image. This will also
 441                  * signal all registered listeners that the image has started.
 442                  *
 443                  * @param clientPutter
 444                  *            The client putter
 445                  */
 446                 @SuppressWarnings("synthetic-access")
 447                 public void setClientPutter(ClientPutter clientPutter) {
 448                         this.clientPutter = clientPutter;
 449                         eventBus.post(new ImageInsertStartedEvent(image));
 450                 }
 451
 452                 //
 453                 // ACTIONS
 454                 //
 455
 456                 /**
 457                  * Cancels the running insert.
 458                  */
 459                 @SuppressWarnings("synthetic-access")
 460                 public void cancel() {
 461                         clientPutter.cancel(null, node.clientCore.clientContext);
 462                         eventBus.post(new ImageInsertAbortedEvent(image));
 463                 }
 464
 465                 //
 466                 // INTERFACE ClientPutCallback
 467                 //
 468
 469                 @Override
 470                 public void onMajorProgress(ObjectContainer objectContainer) {
 471                         /* ignore, we don’t care. */
 472                 }
 473
 474                 @Override
 475                 @SuppressWarnings("synthetic-access")
 476                 public void onFailure(InsertException insertException, BaseClientPutter clientPutter, ObjectContainer objectContainer) {
 477                         if ((insertException != null) && ("Cancelled by user".equals(insertException.getMessage()))) {
 478                                 eventBus.post(new ImageInsertAbortedEvent(image));
 479                         } else {
 480                                 eventBus.post(new ImageInsertFailedEvent(image, insertException));
 481                         }
 482                 }
 483
 484                 @Override
 485                 public void onFetchable(BaseClientPutter clientPutter, ObjectContainer objectContainer) {
 486                         /* ignore, we don’t care. */
 487                 }
 488
 489                 @Override
 490                 public void onGeneratedMetadata(Bucket metadata, BaseClientPutter clientPutter, ObjectContainer objectContainer) {
 491                         /* ignore, we don’t care. */
 492                 }
 493
 494                 @Override
 495                 public void onGeneratedURI(FreenetURI generatedUri, BaseClientPutter clientPutter, ObjectContainer objectContainer) {
 496                         resultingUri = generatedUri;
 497                 }
 498
 499                 @Override
 500                 @SuppressWarnings("synthetic-access")
 501                 public void onSuccess(BaseClientPutter clientPutter, ObjectContainer objectContainer) {
 502                         eventBus.post(new ImageInsertFinishedEvent(image, resultingUri));
 503                 }
 504
 505         }
 506
 507 }