/*
* Sone - UpdateChecker.java - Copyright © 2011–2013 David Roden
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.pterodactylus.sone.core;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.util.Date;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.pterodactylus.sone.core.FreenetInterface.Fetched;
import net.pterodactylus.sone.core.event.UpdateFoundEvent;
import net.pterodactylus.sone.main.SonePlugin;
import net.pterodactylus.util.io.Closer;
import net.pterodactylus.util.logging.Logging;
import net.pterodactylus.util.version.Version;
import com.google.common.eventbus.EventBus;
import com.google.inject.Inject;
import freenet.keys.FreenetURI;
import freenet.support.api.Bucket;
/**
* Watches the official Sone homepage for new releases.
*
* @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
public class UpdateChecker {
/** The logger. */
private static final Logger logger = Logging.getLogger(UpdateChecker.class);
/** The key of the Sone homepage. */
private static final String SONE_HOMEPAGE = "USK@nwa8lHa271k2QvJ8aa0Ov7IHAV-DFOCFgmDt3X6BpCI,DuQSUZiI~agF8c-6tjsFFGuZ8eICrzWCILB60nT8KKo,AQACAAE/sone/";
/** The current latest known edition. */
private static final int LATEST_EDITION = 62;
/** The event bus. */
private final EventBus eventBus;
/** The Freenet interface. */
private final FreenetInterface freenetInterface;
/** The current URI of the homepage. */
private FreenetURI currentUri;
/** The latest known edition. */
private long latestEdition;
/** The current latest known version. */
private Version currentLatestVersion = SonePlugin.VERSION;
/** The release date of the latest version. */
private long latestVersionDate;
/**
* Creates a new update checker.
*
* @param eventBus
* The event bus
* @param freenetInterface
* The freenet interface to use
*/
@Inject
public UpdateChecker(EventBus eventBus, FreenetInterface freenetInterface) {
this.eventBus = eventBus;
this.freenetInterface = freenetInterface;
}
//
// ACCESSORS
//
/**
* Returns whether a version that is later than the currently running
* version has been found.
*
* @return {@code true} if a new version was found
*/
public boolean hasLatestVersion() {
return currentLatestVersion.compareTo(SonePlugin.VERSION) > 0;
}
/**
* Returns the latest version. If no new latest version has been found, the
* current version is returned.
*
* @return The latest known version
*/
public Version getLatestVersion() {
return currentLatestVersion;
}
/**
* Returns the release time of the latest version. If no new latest version
* has been found, the returned value is undefined.
*
* @return The release time of the latest version, if a new version was
* found
*/
public long getLatestVersionDate() {
return latestVersionDate;
}
/**
* Returns the latest known edition of the Sone homepage.
*
* @return The latest edition of the Sone homepage
*/
public long getLatestEdition() {
return latestEdition;
}
//
// ACTIONS
//
/**
* Starts the update checker.
*/
public void start() {
try {
currentUri = new FreenetURI(SONE_HOMEPAGE + LATEST_EDITION);
} catch (MalformedURLException mue1) {
/* this can not really happen unless I screw up. */
logger.log(Level.SEVERE, "Sone Homepage URI invalid!", mue1);
}
freenetInterface.registerUsk(currentUri, new FreenetInterface.Callback() {
@Override
@SuppressWarnings("synthetic-access")
public void editionFound(FreenetURI uri, long edition, boolean newKnownGood, boolean newSlot) {
logger.log(Level.FINEST, String.format("Found update for %s: %d, %s, %s", uri, edition, newKnownGood, newSlot));
if (newKnownGood || newSlot) {
Fetched uriResult = freenetInterface.fetchUri(uri.setMetaString(new String[] { "sone.properties" }));
if (uriResult == null) {
logger.log(Level.WARNING, String.format("Could not fetch properties of latest homepage: %s", uri));
return;
}
Bucket resultBucket = uriResult.getFetchResult().asBucket();
try {
parseProperties(resultBucket.getInputStream(), edition);
latestEdition = edition;
} catch (IOException ioe1) {
logger.log(Level.WARNING, String.format("Could not parse sone.properties of %s!", uri), ioe1);
} finally {
resultBucket.free();
}
}
}
});
}
/**
* Stops the update checker.
*/
public void stop() {
freenetInterface.unregisterUsk(currentUri);
}
//
// PRIVATE ACTIONS
//
/**
* Parses the properties of the latest version and fires events, if
* necessary.
*
* @see UpdateFoundEvent
* @param propertiesInputStream
* The input stream to parse
* @param edition
* The latest edition of the Sone homepage
* @throws IOException
* if an I/O error occured
*/
private void parseProperties(InputStream propertiesInputStream, long edition) throws IOException {
Properties properties = new Properties();
InputStreamReader inputStreamReader = null;
try {
inputStreamReader = new InputStreamReader(propertiesInputStream, "UTF-8");
properties.load(inputStreamReader);
} finally {
Closer.close(inputStreamReader);
}
String versionString = properties.getProperty("CurrentVersion/Version");
String releaseTimeString = properties.getProperty("CurrentVersion/ReleaseTime");
if ((versionString == null) || (releaseTimeString == null)) {
logger.log(Level.INFO, "Invalid data parsed from properties.");
return;
}
Version version = Version.parse(versionString);
long releaseTime = 0;
try {
releaseTime = Long.parseLong(releaseTimeString);
} catch (NumberFormatException nfe1) {
/* ignore. */
}
if ((version == null) || (releaseTime == 0)) {
logger.log(Level.INFO, "Could not parse data from properties.");
return;
}
if (version.compareTo(currentLatestVersion) > 0) {
currentLatestVersion = version;
latestVersionDate = releaseTime;
logger.log(Level.INFO, String.format("Found new version: %s (%tc)", version, new Date(releaseTime)));
eventBus.post(new UpdateFoundEvent(version, releaseTime, edition));
}
}
}