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

   1 /*
   2  * Sone - UpdateChecker.java - Copyright © 2011–2015 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 java.util.logging.Logger.getLogger;
  21
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.io.InputStreamReader;
  25 import java.net.MalformedURLException;
  26 import java.util.Date;
  27 import java.util.Properties;
  28 import java.util.logging.Level;
  29 import java.util.logging.Logger;
  30
  31 import javax.inject.Singleton;
  32
  33 import net.pterodactylus.sone.core.FreenetInterface.Fetched;
  34 import net.pterodactylus.sone.core.event.UpdateFoundEvent;
  35 import net.pterodactylus.sone.main.SonePlugin;
  36 import net.pterodactylus.util.io.Closer;
  37 import net.pterodactylus.util.version.Version;
  38
  39 import com.google.common.eventbus.EventBus;
  40 import com.google.inject.Inject;
  41
  42 import freenet.keys.FreenetURI;
  43 import freenet.support.api.Bucket;
  44
  45 /**
  46  * Watches the official Sone homepage for new releases.
  47  *
  48  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  49  */
  50 @Singleton
  51 public class UpdateChecker {
  52
  53         /** The logger. */
  54         private static final Logger logger = getLogger(UpdateChecker.class.getName());
  55
  56         /** The event bus. */
  57         private final EventBus eventBus;
  58
  59         /** The Freenet interface. */
  60         private final FreenetInterface freenetInterface;
  61
  62         /** The current URI of the homepage. */
  63         private FreenetURI currentUri;
  64
  65         /** The latest known edition. */
  66         private long latestEdition;
  67
  68         /** The current latest known version. */
  69         private Version currentLatestVersion = SonePlugin.VERSION;
  70
  71         /** The release date of the latest version. */
  72         private long latestVersionDate;
  73
  74         /**
  75          * Creates a new update checker.
  76          *
  77          * @param eventBus
  78          *            The event bus
  79          * @param freenetInterface
  80          *            The freenet interface to use
  81          */
  82         @Inject
  83         public UpdateChecker(EventBus eventBus, FreenetInterface freenetInterface) {
  84                 this.eventBus = eventBus;
  85                 this.freenetInterface = freenetInterface;
  86         }
  87
  88         //
  89         // ACCESSORS
  90         //
  91
  92         /**
  93          * Returns whether a version that is later than the currently running
  94          * version has been found.
  95          *
  96          * @return {@code true} if a new version was found
  97          */
  98         public boolean hasLatestVersion() {
  99                 return currentLatestVersion.compareTo(SonePlugin.VERSION) > 0;
 100         }
 101
 102         /**
 103          * Returns the latest version. If no new latest version has been found, the
 104          * current version is returned.
 105          *
 106          * @return The latest known version
 107          */
 108         public Version getLatestVersion() {
 109                 return currentLatestVersion;
 110         }
 111
 112         /**
 113          * Returns the release time of the latest version. If no new latest version
 114          * has been found, the returned value is undefined.
 115          *
 116          * @return The release time of the latest version, if a new version was
 117          *         found
 118          */
 119         public long getLatestVersionDate() {
 120                 return latestVersionDate;
 121         }
 122
 123         /**
 124          * Returns the latest known edition of the Sone homepage.
 125          *
 126          * @return The latest edition of the Sone homepage
 127          */
 128         public long getLatestEdition() {
 129                 return latestEdition;
 130         }
 131
 132         //
 133         // ACTIONS
 134         //
 135
 136         /**
 137          * Starts the update checker.
 138          */
 139         public void start() {
 140                 try {
 141                         currentUri = new FreenetURI(SonePlugin.getHomepage());
 142                 } catch (MalformedURLException mue1) {
 143                         /* this can not really happen unless I screw up. */
 144                         logger.log(Level.SEVERE, "Sone Homepage URI invalid!", mue1);
 145                 }
 146                 freenetInterface.registerUsk(currentUri, new FreenetInterface.Callback() {
 147
 148                         @Override
 149                         @SuppressWarnings("synthetic-access")
 150                         public void editionFound(FreenetURI uri, long edition, boolean newKnownGood, boolean newSlot) {
 151                                 logger.log(Level.FINEST, String.format("Found update for %s: %d, %s, %s", uri, edition, newKnownGood, newSlot));
 152                                 if (newKnownGood || newSlot) {
 153                                         Fetched uriResult = freenetInterface.fetchUri(uri.setMetaString(new String[] { "sone.properties" }));
 154                                         if (uriResult == null) {
 155                                                 logger.log(Level.WARNING, String.format("Could not fetch properties of latest homepage: %s", uri));
 156                                                 return;
 157                                         }
 158                                         Bucket resultBucket = uriResult.getFetchResult().asBucket();
 159                                         try {
 160                                                 parseProperties(resultBucket.getInputStream(), edition);
 161                                                 latestEdition = edition;
 162                                         } catch (IOException ioe1) {
 163                                                 logger.log(Level.WARNING, String.format("Could not parse sone.properties of %s!", uri), ioe1);
 164                                         } finally {
 165                                                 resultBucket.free();
 166                                         }
 167                                 }
 168                         }
 169                 });
 170         }
 171
 172         /**
 173          * Stops the update checker.
 174          */
 175         public void stop() {
 176                 freenetInterface.unregisterUsk(currentUri);
 177         }
 178
 179         //
 180         // PRIVATE ACTIONS
 181         //
 182
 183         /**
 184          * Parses the properties of the latest version and fires events, if
 185          * necessary.
 186          *
 187          * @see UpdateFoundEvent
 188          * @param propertiesInputStream
 189          *            The input stream to parse
 190          * @param edition
 191          *            The latest edition of the Sone homepage
 192          * @throws IOException
 193          *             if an I/O error occured
 194          */
 195         private void parseProperties(InputStream propertiesInputStream, long edition) throws IOException {
 196                 Properties properties = new Properties();
 197                 InputStreamReader inputStreamReader = null;
 198                 try {
 199                         inputStreamReader = new InputStreamReader(propertiesInputStream, "UTF-8");
 200                         properties.load(inputStreamReader);
 201                 } finally {
 202                         Closer.close(inputStreamReader);
 203                 }
 204                 String versionString = properties.getProperty("CurrentVersion/Version");
 205                 String releaseTimeString = properties.getProperty("CurrentVersion/ReleaseTime");
 206                 if ((versionString == null) || (releaseTimeString == null)) {
 207                         logger.log(Level.INFO, "Invalid data parsed from properties.");
 208                         return;
 209                 }
 210                 Version version = Version.parse(versionString);
 211                 long releaseTime = 0;
 212                 try {
 213                         releaseTime = Long.parseLong(releaseTimeString);
 214                 } catch (NumberFormatException nfe1) {
 215                         /* ignore. */
 216                 }
 217                 if ((version == null) || (releaseTime == 0)) {
 218                         logger.log(Level.INFO, "Could not parse data from properties.");
 219                         return;
 220                 }
 221                 if (version.compareTo(currentLatestVersion) > 0) {
 222                         currentLatestVersion = version;
 223                         latestVersionDate = releaseTime;
 224                         logger.log(Level.INFO, String.format("Found new version: %s (%tc)", version, new Date(releaseTime)));
 225                         eventBus.post(new UpdateFoundEvent(version, releaseTime, edition));
 226                 }
 227         }
 228
 229 }