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package org.openslx.imagemaster.serverconnection;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import org.apache.commons.lang.mutable.MutableInt;
import org.apache.log4j.Logger;
import org.openslx.filetransfer.Downloader;
import org.openslx.filetransfer.FileRange;
import org.openslx.filetransfer.IncomingEvent;
import org.openslx.filetransfer.Listener;
import org.openslx.filetransfer.Uploader;
import org.openslx.filetransfer.WantRangeCallback;
import org.openslx.imagemaster.Globals;
import org.openslx.imagemaster.db.DbImage;
/**
* Class to handle all incoming and outgoing connections.
* Also handles the authentication and the saving/delivering of images.
*/
public class ConnectionHandler implements IncomingEvent
{
private static Logger log = Logger.getLogger( ConnectionHandler.class );
private static SSLContext sslContext;
private static Map<String, UploadingImage> pendingIncomingUploads = new ConcurrentHashMap<>();
private static Map<String, DbImage> pendingIncomingDownloads = new ConcurrentHashMap<>();
private static IncomingEvent eventHandler = new ConnectionHandler();
private static ThreadPoolExecutor uploadPool = new ThreadPoolExecutor( 0, 5, 6, TimeUnit.MINUTES, new SynchronousQueue<Runnable>() );
private static ThreadPoolExecutor downloadPool = new ThreadPoolExecutor( 0, 5, 6, TimeUnit.MINUTES, new SynchronousQueue<Runnable>() );
private static Listener listener;
static {
log.debug( "Starting listener on port " + Globals.getSslSocketPort() );
try {
String pathToKeyStore = Globals.getSslKeystoreFile();
char[] passphrase = Globals.getSslKeystorePassword().toCharArray();
KeyStore keystore = KeyStore.getInstance( "JKS" );
keystore.load( new FileInputStream( pathToKeyStore ), passphrase );
KeyManagerFactory kmf = KeyManagerFactory.getInstance( KeyManagerFactory.getDefaultAlgorithm() );
kmf.init( keystore, passphrase );
sslContext = SSLContext.getInstance( "SSLv3" );
KeyManager[] keyManagers = kmf.getKeyManagers();
sslContext.init( keyManagers, null, null );
listener = new Listener( eventHandler, sslContext, Globals.getSslSocketPort() );
listener.start();
} catch ( FileNotFoundException e ) {
log.error( "Could not find keystore." );
System.exit( 2 );
} catch ( KeyStoreException e ) {
log.error( "KeyStore implemenation not supported." );
System.exit( 2 );
} catch ( NoSuchAlgorithmException e ) {
log.error( "Could not find such Algorithm" );
System.exit( 2 );
} catch ( CertificateException e ) {
log.error( "Certificate unvalid." );
System.exit( 2 );
} catch ( IOException e ) {
log.error( "Could not read keyfile" );
System.exit( 2 );
} catch ( UnrecoverableKeyException e ) {
log.error( "Key in keystore is not valid" );
System.exit( 2 );
} catch ( KeyManagementException e ) {
log.error( "Context initialization failed." );
System.exit( 2 );
}
}
/**
* Add a new allowed incoming upload connection
* for the given token and image.
*
* @param token The unique token
* @param image Image being uploaded
*/
public static void addUpload( String token, UploadingImage image )
{
pendingIncomingUploads.put( token, image );
log.debug( "Added upload" );
}
/**
* Add a new allowed incoming download connection
* for the given token and image.
*
* @param token The unique token
* @param image Image being uploaded
*/
public static void addDownload( String token, DbImage image )
{
pendingIncomingDownloads.put( token, image );
log.debug( "Added download" );
}
/**
* Server is uploading - client is downloading!
*/
@Override
public void incomingUploader( final Uploader uploader )
{
String token = uploader.getToken();
// check token to identify the client
if ( token == null ) {
uploader.sendErrorCode( "No token available." );
uploader.close( null );
return;
}
final DbImage image = pendingIncomingDownloads.remove( token );
if ( image == null ) {
uploader.sendErrorCode( "Token not accepted." );
uploader.close( null );
return;
}
try {
uploadPool.execute( new Runnable() {
@Override
public void run()
{
uploader.upload( image.getAbsolutePath() );
}
} );
} catch ( RejectedExecutionException e ) {
uploader.sendErrorCode( "Too many concurrent uploads." );
uploader.close( null );
}
}
/**
* Server is downloading - client is uploading!
*/
@Override
public void incomingDownloader( final Downloader downloader ) throws IOException
{
log.debug( "Client wants to upload" );
String token = downloader.getToken();
if ( token == null )
{
downloader.sendErrorCode( "No token available." );
downloader.close( null );
return;
}
final UploadingImage image = pendingIncomingUploads.remove( token );
if ( image == null ) {
downloader.sendErrorCode( "Token not accepted." );
downloader.close( null );
return;
}
final MutableInt lastBlock = new MutableInt( -1 );
try {
downloadPool.execute( new Runnable() {
@Override
public void run()
{
downloader.download( image.getAbsolutePath(), new WantRangeCallback() {
@Override
public FileRange get()
{
if ( lastBlock.intValue() != -1 ) {
image.setNeedsCheck( lastBlock.intValue() );
image.increaseTransmittedTimes( lastBlock.intValue() );
}
// get start of range.
int blockNumber = image.getNextMissingBlock();
if ( blockNumber == -1 ) {
log.debug( "Download complete." );
return null;
}
lastBlock.setValue( blockNumber );
log.debug( "Block " + blockNumber + " was transmitted " + image.getTimesTransmitted( blockNumber ) + " time(s)." );
long startOfRange = image.getNextMissingBlock() * Globals.blockSize;
long endOfRange = Math.min( startOfRange + Globals.blockSize, image.getFileSize() );
FileRange range = new FileRange( startOfRange, endOfRange );
return range;
}
} );
image.updateDb();
}
} );
} catch ( RejectedExecutionException e ) {
downloader.sendErrorCode( "Too many concurrent downloads." );
downloader.close( null );
}
}
}
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