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

   1 /*
   2  * Sone - UpdateChecker.java - Copyright © 2011–2013 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 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.core.FreenetInterface.Fetched;
  30 import net.pterodactylus.sone.core.event.UpdateFoundEvent;
  31 import net.pterodactylus.sone.main.SonePlugin;
  32 import net.pterodactylus.util.io.Closer;
  33 import net.pterodactylus.util.logging.Logging;
  34 import net.pterodactylus.util.version.Version;
  35
  36 import com.google.common.eventbus.EventBus;
  37 import com.google.inject.Inject;
  38
  39 import freenet.keys.FreenetURI;
  40 import freenet.support.api.Bucket;
  41
  42 /**
  43  * Watches the official Sone homepage for new releases.
  44  *
  45  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  46  */
  47 public class UpdateChecker {
  48
  49         /** The logger. */
  50         private static final Logger logger = Logging.getLogger(UpdateChecker.class);
  51
  52         /** The key of the Sone homepage. */
  53         private static final String SONE_HOMEPAGE = "USK@nwa8lHa271k2QvJ8aa0Ov7IHAV-DFOCFgmDt3X6BpCI,DuQSUZiI~agF8c-6tjsFFGuZ8eICrzWCILB60nT8KKo,AQACAAE/sone/";
  54
  55         /** The current latest known edition. */
  56         private static final int LATEST_EDITION = 60;
  57
  58         /** The event bus. */
  59         private final EventBus eventBus;
  60
  61         /** The Freenet interface. */
  62         private final FreenetInterface freenetInterface;
  63
  64         /** The current URI of the homepage. */
  65         private FreenetURI currentUri;
  66
  67         /** The latest known edition. */
  68         private long latestEdition;
  69
  70         /** The current latest known version. */
  71         private Version currentLatestVersion = SonePlugin.VERSION;
  72
  73         /** The release date of the latest version. */
  74         private long latestVersionDate;
  75
  76         /**
  77          * Creates a new update checker.
  78          *
  79          * @param eventBus
  80          *            The event bus
  81          * @param freenetInterface
  82          *            The freenet interface to use
  83          */
  84         @Inject
  85         public UpdateChecker(EventBus eventBus, FreenetInterface freenetInterface) {
  86                 this.eventBus = eventBus;
  87                 this.freenetInterface = freenetInterface;
  88         }
  89
  90         //
  91         // ACCESSORS
  92         //
  93
  94         /**
  95          * Returns whether a version that is later than the currently running
  96          * version has been found.
  97          *
  98          * @return {@code true} if a new version was found
  99          */
 100         public boolean hasLatestVersion() {
 101                 return currentLatestVersion.compareTo(SonePlugin.VERSION) > 0;
 102         }
 103
 104         /**
 105          * Returns the latest version. If no new latest version has been found, the
 106          * current version is returned.
 107          *
 108          * @return The latest known version
 109          */
 110         public Version getLatestVersion() {
 111                 return currentLatestVersion;
 112         }
 113
 114         /**
 115          * Returns the release time of the latest version. If no new latest version
 116          * has been found, the returned value is undefined.
 117          *
 118          * @return The release time of the latest version, if a new version was
 119          *         found
 120          */
 121         public long getLatestVersionDate() {
 122                 return latestVersionDate;
 123         }
 124
 125         /**
 126          * Returns the latest known edition of the Sone homepage.
 127          *
 128          * @return The latest edition of the Sone homepage
 129          */
 130         public long getLatestEdition() {
 131                 return latestEdition;
 132         }
 133
 134         //
 135         // ACTIONS
 136         //
 137
 138         /**
 139          * Starts the update checker.
 140          */
 141         public void start() {
 142                 try {
 143                         currentUri = new FreenetURI(SONE_HOMEPAGE + LATEST_EDITION);
 144                 } catch (MalformedURLException mue1) {
 145                         /* this can not really happen unless I screw up. */
 146                         logger.log(Level.SEVERE, "Sone Homepage URI invalid!", mue1);
 147                 }
 148                 freenetInterface.registerUsk(currentUri, new FreenetInterface.Callback() {
 149
 150                         @Override
 151                         @SuppressWarnings("synthetic-access")
 152                         public void editionFound(FreenetURI uri, long edition, boolean newKnownGood, boolean newSlot) {
 153                                 logger.log(Level.FINEST, String.format("Found update for %s: %d, %s, %s", uri, edition, newKnownGood, newSlot));
 154                                 if (newKnownGood || newSlot) {
 155                                         Fetched uriResult = freenetInterface.fetchUri(uri.setMetaString(new String[] { "sone.properties" }));
 156                                         if (uriResult == null) {
 157                                                 logger.log(Level.WARNING, String.format("Could not fetch properties of latest homepage: %s", uri));
 158                                                 return;
 159                                         }
 160                                         Bucket resultBucket = uriResult.getFetchResult().asBucket();
 161                                         try {
 162                                                 parseProperties(resultBucket.getInputStream(), edition);
 163                                                 latestEdition = edition;
 164                                         } catch (IOException ioe1) {
 165                                                 logger.log(Level.WARNING, String.format("Could not parse sone.properties of %s!", uri), ioe1);
 166                                         } finally {
 167                                                 resultBucket.free();
 168                                         }
 169                                 }
 170                         }
 171                 });
 172         }
 173
 174         /**
 175          * Stops the update checker.
 176          */
 177         public void stop() {
 178                 freenetInterface.unregisterUsk(currentUri);
 179         }
 180
 181         //
 182         // PRIVATE ACTIONS
 183         //
 184
 185         /**
 186          * Parses the properties of the latest version and fires events, if
 187          * necessary.
 188          *
 189          * @see UpdateFoundEvent
 190          * @param propertiesInputStream
 191          *            The input stream to parse
 192          * @param edition
 193          *            The latest edition of the Sone homepage
 194          * @throws IOException
 195          *             if an I/O error occured
 196          */
 197         private void parseProperties(InputStream propertiesInputStream, long edition) throws IOException {
 198                 Properties properties = new Properties();
 199                 InputStreamReader inputStreamReader = null;
 200                 try {
 201                         inputStreamReader = new InputStreamReader(propertiesInputStream, "UTF-8");
 202                         properties.load(inputStreamReader);
 203                 } finally {
 204                         Closer.close(inputStreamReader);
 205                 }
 206                 String versionString = properties.getProperty("CurrentVersion/Version");
 207                 String releaseTimeString = properties.getProperty("CurrentVersion/ReleaseTime");
 208                 if ((versionString == null) || (releaseTimeString == null)) {
 209                         logger.log(Level.INFO, "Invalid data parsed from properties.");
 210                         return;
 211                 }
 212                 Version version = Version.parse(versionString);
 213                 long releaseTime = 0;
 214                 try {
 215                         releaseTime = Long.parseLong(releaseTimeString);
 216                 } catch (NumberFormatException nfe1) {
 217                         /* ignore. */
 218                 }
 219                 if ((version == null) || (releaseTime == 0)) {
 220                         logger.log(Level.INFO, "Could not parse data from properties.");
 221                         return;
 222                 }
 223                 if (version.compareTo(currentLatestVersion) > 0) {
 224                         currentLatestVersion = version;
 225                         latestVersionDate = releaseTime;
 226                         logger.log(Level.INFO, String.format("Found new version: %s (%tc)", version, new Date(releaseTime)));
 227                         eventBus.post(new UpdateFoundEvent(version, releaseTime, edition));
 228                 }
 229         }
 230
 231 }