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

   1 /*
   2  * Sone - UpdateChecker.java - Copyright © 2011 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 java.io.IOException;
  21 import java.io.InputStream;
  22 import java.io.InputStreamReader;
  23 import java.net.MalformedURLException;
  24 import java.util.Date;
  25 import java.util.Properties;
  26 import java.util.logging.Level;
  27 import java.util.logging.Logger;
  28
  29 import net.pterodactylus.sone.main.SonePlugin;
  30 import net.pterodactylus.util.collection.Pair;
  31 import net.pterodactylus.util.io.Closer;
  32 import net.pterodactylus.util.logging.Logging;
  33 import net.pterodactylus.util.version.Version;
  34 import freenet.client.FetchResult;
  35 import freenet.keys.FreenetURI;
  36 import freenet.support.api.Bucket;
  37
  38 /**
  39  * Watches the official Sone homepage for new releases.
  40  *
  41  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  42  */
  43 public class UpdateChecker {
  44
  45         /** The logger. */
  46         private static final Logger logger = Logging.getLogger(UpdateChecker.class);
  47
  48         /** The key of the Sone homepage. */
  49         private static final String SONE_HOMEPAGE = "USK@nwa8lHa271k2QvJ8aa0Ov7IHAV-DFOCFgmDt3X6BpCI,DuQSUZiI~agF8c-6tjsFFGuZ8eICrzWCILB60nT8KKo,AQACAAE/sone/";
  50
  51         /** The current latest known edition. */
  52         private static final int LATEST_EDITION = 23;
  53
  54         /** The Freenet interface. */
  55         private final FreenetInterface freenetInterface;
  56
  57         /** The update listener manager. */
  58         private final UpdateListenerManager updateListenerManager = new UpdateListenerManager();
  59
  60         /** The current URI of the homepage. */
  61         private FreenetURI currentUri;
  62
  63         /** The current latest known version. */
  64         private Version currentLatestVersion = SonePlugin.VERSION;
  65
  66         /** The release date of the latest version. */
  67         private long latestVersionDate;
  68
  69         /**
  70          * Creates a new update checker.
  71          *
  72          * @param freenetInterface
  73          *            The freenet interface to use
  74          */
  75         public UpdateChecker(FreenetInterface freenetInterface) {
  76                 this.freenetInterface = freenetInterface;
  77         }
  78
  79         //
  80         // EVENT LISTENER MANAGEMENT
  81         //
  82
  83         /**
  84          * Adds the given listener to the list of registered listeners.
  85          *
  86          * @param updateListener
  87          *            The listener to add
  88          */
  89         public void addUpdateListener(UpdateListener updateListener) {
  90                 updateListenerManager.addListener(updateListener);
  91         }
  92
  93         /**
  94          * Removes the given listener from the list of registered listeners.
  95          *
  96          * @param updateListener
  97          *            The listener to remove
  98          */
  99         public void removeUpdateListener(UpdateListener updateListener) {
 100                 updateListenerManager.removeListener(updateListener);
 101         }
 102
 103         //
 104         // ACCESSORS
 105         //
 106
 107         /**
 108          * Returns whether a version that is later than the currently running
 109          * version has been found.
 110          *
 111          * @return {@code true} if a new version was found
 112          */
 113         public boolean hasLatestVersion() {
 114                 return currentLatestVersion.compareTo(SonePlugin.VERSION) > 0;
 115         }
 116
 117         /**
 118          * Returns the latest version. If no new latest version has been found, the
 119          * current version is returned.
 120          *
 121          * @return The latest known version
 122          */
 123         public Version getLatestVersion() {
 124                 return currentLatestVersion;
 125         }
 126
 127         /**
 128          * Returns the release time of the latest version. If no new latest version
 129          * has been found, the returned value is undefined.
 130          *
 131          * @return The release time of the latest version, if a new version was
 132          *         found
 133          */
 134         public long getLatestVersionDate() {
 135                 return latestVersionDate;
 136         }
 137
 138         //
 139         // ACTIONS
 140         //
 141
 142         /**
 143          * Starts the update checker.
 144          */
 145         public void start() {
 146                 try {
 147                         currentUri = new FreenetURI(SONE_HOMEPAGE + LATEST_EDITION);
 148                 } catch (MalformedURLException mue1) {
 149                         /* this can not really happen unless I screw up. */
 150                         logger.log(Level.SEVERE, "Sone Homepage URI invalid!", mue1);
 151                 }
 152                 freenetInterface.registerUsk(currentUri, new FreenetInterface.Callback() {
 153
 154                         @Override
 155                         @SuppressWarnings("synthetic-access")
 156                         public void editionFound(FreenetURI uri, long edition, boolean newKnownGood, boolean newSlot) {
 157                                 logger.log(Level.FINEST, "Found update for %s: %d, %s, %s", new Object[] { uri, edition, newKnownGood, newSlot });
 158                                 if (newKnownGood || newSlot) {
 159                                         Pair<FreenetURI, FetchResult> uriResult = freenetInterface.fetchUri(uri.setMetaString(new String[] { "sone.properties" }));
 160                                         if (uriResult == null) {
 161                                                 logger.log(Level.WARNING, "Could not fetch properties of latest homepage: %s", uri);
 162                                                 return;
 163                                         }
 164                                         Bucket resultBucket = uriResult.getRight().asBucket();
 165                                         try {
 166                                                 parseProperties(resultBucket.getInputStream());
 167                                         } catch (IOException ioe1) {
 168                                                 logger.log(Level.WARNING, "Could not parse sone.properties of " + uri, ioe1);
 169                                         } finally {
 170                                                 resultBucket.free();
 171                                         }
 172                                 }
 173                         }
 174                 });
 175         }
 176
 177         /**
 178          * Stops the update checker.
 179          */
 180         public void stop() {
 181                 freenetInterface.unregisterUsk(currentUri);
 182         }
 183
 184         //
 185         // PRIVATE ACTIONS
 186         //
 187
 188         /**
 189          * Parses the properties of the latest version and fires events, if
 190          * necessary.
 191          *
 192          * @see UpdateListener#updateFound(Version, long)
 193          * @see UpdateListenerManager#fireUpdateFound(Version, long)
 194          * @param propertiesInputStream
 195          *            The input stream to parse
 196          * @throws IOException
 197          *             if an I/O error occured
 198          */
 199         private void parseProperties(InputStream propertiesInputStream) throws IOException {
 200                 Properties properties = new Properties();
 201                 InputStreamReader inputStreamReader = null;
 202                 try {
 203                         inputStreamReader = new InputStreamReader(propertiesInputStream, "UTF-8");
 204                         properties.load(inputStreamReader);
 205                 } finally {
 206                         Closer.close(inputStreamReader);
 207                 }
 208                 String versionString = properties.getProperty("CurrentVersion/Version");
 209                 String releaseTimeString = properties.getProperty("CurrentVersion/ReleaseTime");
 210                 if ((versionString == null) || (releaseTimeString == null)) {
 211                         logger.log(Level.INFO, "Invalid data parsed from properties.");
 212                         return;
 213                 }
 214                 Version version = Version.parse(versionString);
 215                 long releaseTime = 0;
 216                 try {
 217                         releaseTime = Long.parseLong(releaseTimeString);
 218                 } catch (NumberFormatException nfe1) {
 219                         /* ignore. */
 220                 }
 221                 if ((version == null) || (releaseTime == 0)) {
 222                         logger.log(Level.INFO, "Could not parse data from properties.");
 223                         return;
 224                 }
 225                 if (version.compareTo(currentLatestVersion) > 0) {
 226                         currentLatestVersion = version;
 227                         latestVersionDate = releaseTime;
 228                         logger.log(Level.INFO, "Found new version: %s (%tc)", new Object[] { version, new Date(releaseTime) });
 229                         updateListenerManager.fireUpdateFound(version, releaseTime);
 230                 }
 231         }
 232
 233 }