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