publishtransaction.java

这是一个基于java编写的torrent的P2P源码

/*
 * Created on Jun 29, 2006 10:16:26 PM
 * Copyright (C) 2006 Aelitis, All Rights Reserved.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 */
package com.aelitis.azureus.ui.swt.browser.listener.publish;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.internal.image.FileFormat;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;

import org.bouncycastle.util.encoders.Base64;
import org.json.JSONObject;

import com.aelitis.azureus.core.messenger.ClientMessageContext;
import com.aelitis.azureus.ui.swt.browser.msg.BrowserMessage;
import com.aelitis.azureus.ui.swt.browser.txn.Transaction;
import com.aelitis.azureus.ui.swt.utils.ImageResizeException;
import com.aelitis.azureus.ui.swt.utils.ImageResizer;

import org.gudy.azureus2.plugins.PluginInterface;
import org.gudy.azureus2.plugins.download.Download;
import org.gudy.azureus2.plugins.torrent.*;


/**
 * Tracks the progress of creating a torrent during the publish process.
 * 
 * @author dharkness
 * @created Jul 20, 2006
 */
public class PublishTransaction extends Transaction
{
	
	
	private static final String ELEMENTS = "elements";

	public static final String PUBLISH_ATTRIBUTE_KEY = "DIRECTOR PUBLISH";  //TODO this should really be placed in DirectorPlugin.java
	
	private static final int   DEFAULT_IMAGE_BOX_SIZE = 320;
	private static final float DEFAULT_JPEG_QUALITY = 0.85f;
	
	private PluginInterface pluginInterface;
	private Shell shell;
	
	private LocalHoster hoster;
	
	private TorrentCreator creator;
	private TorrentCreatorListener creatorListener;
	private File dataFile;
	
	public void setPluginInterface(PluginInterface pluginInterface) {
		this.pluginInterface = pluginInterface;
	}

	public void setShell(Shell shell) {
		this.shell = shell;
	}
	
	public void setLocalHoster(LocalHoster hoster) {
		this.hoster = hoster;
	}

	/**
     * Creates the transaction. Called by the manager.
     * 
     * @param id unique ID assigned by the manager
     * @param type passed by manager
     * @param context used to access the browser
     */
    public PublishTransaction ( int id , String type , ClientMessageContext context ) {
        super(id, type, context);
    }


    /**
     * Opens a file dialog so the user can choose the file to torrent.
     */
    public void chooseFile ( BrowserMessage message ) {    	
    	FileDialog dialog = new FileDialog(shell);    	
    	String file = dialog.open();    	
    	createTorrentFile(file);
    }

    /**
     * Opens a file dialog so the user can choose the folder to torrent.
     */
    public void chooseFolder ( BrowserMessage message ) {
    	DirectoryDialog dialog = new DirectoryDialog(shell);    	
    	String file = dialog.open();
    	createTorrentFile(file);
    }
    
    protected boolean canceling ( ) {
    	if(creator != null) {
    		creator.cancel();
    		creator.removeListener(creatorListener);
    		creator = null;
    		//Gudy	sendBrowserMessage("torrent","canceled");
    	}
        return true;
    }
    
    /**
     * Opens a file dialog so the user can choose the image to use as a thumbnail
     */
    public void chooseThumbnail(BrowserMessage message) {
    	final int resize_size[] = {DEFAULT_IMAGE_BOX_SIZE,DEFAULT_IMAGE_BOX_SIZE};
    	final float image_quality[] = {DEFAULT_JPEG_QUALITY};
    	JSONObject elements = null; //will be used if several thumbnails are required on a single page
        if ( message.isParamObject() ) {
            JSONObject parameters = message.getDecodedObject();
    		try {
    			resize_size[0] = parameters.getInt("width");
    			resize_size[1] = parameters.getInt("height");
    			image_quality[0] = (float) parameters.getDouble("quality");
    			if (parameters.has(ELEMENTS)){
    				elements = parameters.getJSONObject(ELEMENTS);
    			}
    		} catch(Exception e) {
    			//Possible bad parameters given, use default values
    			e.printStackTrace();
    		}
        }
    	FileDialog dialog = new FileDialog(shell,SWT.OPEN);
    	dialog.setFilterNames(new String[] {"Image Files"});
    	dialog.setFilterExtensions(new String[] {"*.jpg;*.jpeg;*.bmp;*.gif;*.png"});
    	final String fileName = dialog.open();
    	if(fileName != null) {
    		//Run async not to block the UI
			/*Thread runner = 
                new Thread("Thumbnail Creator") {
    				public void run() {*/
    		
    					try {
                            sendBrowserMessage("thumb", "start", elements);
                            
        					File file = new File(fileName);    				
    	    				ResizedImageInfo info = loadAndResizeImage(file,resize_size[0],resize_size[1],image_quality[0]);
    	    				if(info == null) {
    	    					debug("User canceled image resizing");
    	    					sendBrowserMessage("thumb", "clear", elements);
    	    				} else {
	    	    				final String thumbURL = info.url.toString();
	    	    				debug("Size : " + info.data.length);
	    	    				
	    	    				final String encoded = new String(Base64.encode(info.data));
	                            JSONObject params = new JSONObject();
	                            params.put("url", thumbURL);
	                            params.put("width", info.width);
	                            params.put("height", info.height);
	                            params.put("data", encoded);
	                            if ( elements != null ){
	                            	params.put(ELEMENTS, elements);
	                            }
	                            sendBrowserMessage("thumb", "done", params);
    	    				}
        	    		}
    					catch(ImageResizeException e) {
    						debug("Error resizing image",e);
    						sendBrowserMessage("thumb", "clear", elements);
                            
                            JSONObject params = new JSONObject();
                            params.put("message", e.getMessage());
                            sendBrowserMessage("page", "error",params);
    					}
                        catch (Exception e) {
        					debug("Error reading file",e);
                            sendBrowserMessage("thumb", "clear", elements);
                            
                            JSONObject params = new JSONObject();
                            params.put("message", "Azureus cannot process this image. Please select another one.");
                            sendBrowserMessage("page", "error",params);
        				}
                        catch (OutOfMemoryError e) {
                        	debug("Error processing the image",e);
                        	
                        	sendBrowserMessage("thumb", "clear", elements);
                            
                            JSONObject params = new JSONObject();
                            params.put("message", "Azureus cannot process this image (likely reason is that it is too big). Please select another one.");
                            sendBrowserMessage("page", "error",params);
                        	
                        }
    				/*}
			    };
			runner.setDaemon(true);
			runner.start();    	*/		
    	}
    }

    /**
     * Pulls the modified torrent from the result web page and saves it locally.
     */
    public void torrentIsReady ( BrowserMessage message ) {
         torrentIsReady(message.getDecodedObject().getString("torrent"));
    }

    protected void torrentIsReady ( String strTorrent ) {
    	
        try{
        	strTorrent = strTorrent.replaceAll("\\n", "");
            debug( "data file path = [" + dataFile.getPath()+"]" );
            debug("Torrent is ready, size = " + strTorrent.length() + ", content (base64) : " + strTorrent);
            
            byte[] torrent_data = Base64.decode(strTorrent);
            
            debug("Torrent Byte Length: " + torrent_data.length /* + ", content : " + new String(torrent_data) */ );
            Torrent torrent = pluginInterface.getTorrentManager().createFromBEncodedData(torrent_data);
           
            torrent.setDefaultEncoding();

            final Download download = pluginInterface.getDownloadManager().addDownload(torrent, null, dataFile );
            
            
            //get the "content" attribute for the download
            TorrentAttribute attrib = pluginInterface.getTorrentManager().getPluginAttribute( TorrentAttribute.TA_CONTENT_MAP );
            Map content_map = download.getMapAttribute( attrib );
            
            if( content_map == null ) {
            	//System.out.print( "torrentIsReady:: content_map == null" );
            	content_map = new HashMap();
            }
            
            content_map.put( PUBLISH_ATTRIBUTE_KEY, new Long(1) );   //mark this download as "Director published" so we can pick it up later
            download.setMapAttribute( attrib, content_map );
            
            download.setForceStart( true );
  
            //Transaction is finished
            stop();
        }
        catch( Throwable t ) {
            t.printStackTrace();
        }
    } 


    private void torrentCreationFailed(Exception cause) {
    	debug("Torrent Creation Failed", cause);
    	
    	sendBrowserMessage("torrent","failed");
    	
    	JSONObject params = new JSONObject();
		params.put("message", "Azureus cannot process this file. Please select another file.");
		sendBrowserMessage("page", "error",params);
		
    }
    
    private void createTorrentFile(String file) {
    	if(file != null) {   		
    		dataFile = new File(file);
    		try {
    			creator = pluginInterface.getTorrentManager().createFromDataFileEx(dataFile, new URL("http://xxxxxxxxxxxxxxxxx:6969/announce"), false);

    			creatorListener = new TorrentCreatorListener() {