/*
 * Created on 19-Oct-2005
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, 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.
 *
 */

package org.gudy.azureus2.pluginsimpl.local.utils.resourceuploader;

import java.io.*;
import java.net.*;
import java.util.*;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;

import org.gudy.azureus2.core3.security.SEPasswordListener;
import org.gudy.azureus2.core3.security.SESecurityManager;
import org.gudy.azureus2.core3.util.AddressUtils;
import org.gudy.azureus2.core3.util.Constants;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.UrlUtils;
import org.gudy.azureus2.plugins.utils.resourcedownloader.ResourceDownloader;
import org.gudy.azureus2.plugins.utils.resourcedownloader.ResourceDownloaderException;
import org.gudy.azureus2.plugins.utils.resourceuploader.*;

public class 
ResourceUploaderURLImpl
	implements ResourceUploader, SEPasswordListener
{
	private URL				target;
	private InputStream		data;
	private String			user_name;
	private String			password;
	
	private Map				properties = new HashMap();
	
	
	protected
	ResourceUploaderURLImpl(
		URL			_target,
		InputStream	_data,
		String		_user_name,
		String		_password )
	{
		target		= _target;
		data		= _data;
		user_name	= _user_name;
		password	= _password;
	}
	
	public void
	setProperty(
		String		name,
		Object		value )
	
		throws ResourceDownloaderException
	{
		properties.put( name, value );
	}
	
	public Object
	getProperty(
		String		name )
	
		throws ResourceDownloaderException
	{
		return( properties.get( name ));
	}
	
	public InputStream
	upload()
	
		throws ResourceUploaderException
	{
		try{
			
			try{
				URL	url = new URL( target.toString().replaceAll( " ", "%20" ));
			      
					// some authentications screw up without an explicit port number here
				
				String	protocol = url.getProtocol().toLowerCase();
				
				if ( url.getPort() == -1 ){
					
					int	target_port;
					
					if ( protocol.equals( "http" )){
						
						target_port = 80;
						
					}else{
						
						target_port = 443;
					}
					
					try{
						String str = target.toString().replaceAll( " ", "%20" );
					
						int	pos = str.indexOf( "://" );
						
						pos = str.indexOf( "/", pos+4 );
						
							// might not have a trailing "/"
						
						if ( pos == -1 ){
							
							url = new URL( str + ":" + target_port + "/" );
							
						}else{
						
							url = new URL( str.substring(0,pos) + ":" + target_port + str.substring(pos));
						}
												
					}catch( Throwable e ){
						
						Debug.printStackTrace( e );
					}
				}
				
				url = AddressUtils.adjustURL( url );
				
				try{
					if ( user_name != null ){
						
						SESecurityManager.setPasswordHandler( url, this );
					}

					for (int i=0;i<2;i++){
						
						try{
							HttpURLConnection	con;
							
							if ( url.getProtocol().equalsIgnoreCase("https")){
						      	
									// see ConfigurationChecker for SSL client defaults
				
								HttpsURLConnection ssl_con = (HttpsURLConnection)url.openConnection();
				
									// allow for certs that contain IP addresses rather than dns names
				  	
								ssl_con.setHostnameVerifier(
										new HostnameVerifier()
										{
											public boolean
											verify(
													String		host,
													SSLSession	session )
											{
												return( true );
											}
										});
				  	
								con = ssl_con;
				  	
							}else{
				  	
								con = (HttpURLConnection) url.openConnection();
				  	
							}
				  
							con.setRequestMethod( "POST" );
							
							con.setRequestProperty("User-Agent", Constants.AZUREUS_NAME + " " + Constants.AZUREUS_VERSION);     
				  
							setRequestProperties( con, false );
							
							con.setDoOutput( true );
							con.setDoInput( true );
							
							OutputStream	os = con.getOutputStream();
							
							byte[]	buffer = new byte[65536];
							
							while( true ){
							
								int	len = data.read( buffer );
								
								if (len <= 0 ){
									
									break;
								}
								
								os.write( buffer, 0, len );
							}
							
							con.connect();
				
							int response = con.getResponseCode();
												
							if ((response != HttpURLConnection.HTTP_ACCEPTED) && (response != HttpURLConnection.HTTP_OK )){
								
								throw( new ResourceUploaderException("Error on connect for '" + url.toString() + "': " + Integer.toString(response) + " " + con.getResponseMessage()));    
							}
	
							InputStream is = con.getInputStream();
							
							getRequestProperties( con );
							
							return( is );
							
						}catch( SSLException e ){
							
							if ( i == 0 ){
								
								if ( SESecurityManager.installServerCertificates( url ) != null ){
									
										// certificate has been installed
									
									continue;	// retry with new certificate
								}
							}

							throw( e );	
							
						}catch( IOException e ){
							
							if ( i == 0 ){
								
					      		URL retry_url = UrlUtils.getIPV4Fallback( url );
				      			
					      		if ( retry_url != null ){
					      				
					      			url = retry_url;
					      			
					      			continue;
					      		}
							}
							
							throw( e );
						}
					}
					
					throw( new ResourceUploaderException("Should never get here" ));
					
				}finally{
							
					if ( user_name != null ){
								
						SESecurityManager.setPasswordHandler( url, null );
					}
				}
			}catch (java.net.MalformedURLException e){
				
				throw( new ResourceUploaderException("Exception while parsing URL '" + target + "':" + e.getMessage(), e));
				
			}catch (java.net.UnknownHostException e){
				
				throw( new ResourceUploaderException("Exception while initializing download of '" + target + "': Unknown Host '" + e.getMessage() + "'", e));
				
			}catch (java.io.IOException e ){
				
				throw( new ResourceUploaderException("I/O Exception while downloading '" + target + "':" + e.toString(), e ));
			}
		}catch( Throwable e ){
			
			ResourceUploaderException	rde;
			
			if ( e instanceof ResourceUploaderException ){
				
				rde = (ResourceUploaderException)e;
				
			}else{
				
				rde = new ResourceUploaderException( "Unexpected error", e );
			}
			
			throw( rde );
			
		}finally{
			
			try{
				data.close();
				
			}catch( Throwable e ){
				
				e.printStackTrace();
			}
			
		}
	}
	
	protected void
	setRequestProperties(
		HttpURLConnection		con,
		boolean					use_compression )
	{		
		Iterator	it = properties.entrySet().iterator();
		
		while( it.hasNext()){
			
			Map.Entry entry = (Map.Entry)it.next();
			
			String	key 	= (String)entry.getKey();
			Object	value	= entry.getValue();
			
			if ( key.startsWith( "URL_" ) && value instanceof String ){
			
				key = key.substring(4);
				
				if ( key.equalsIgnoreCase( "Accept-Encoding" ) && !use_compression ){
					
					//skip
					
				}else{
					
					con.setRequestProperty(key,(String)value);
				}
			}
		}
	}
	
	protected void
	getRequestProperties(
		HttpURLConnection		con )
	{
		try{
			setProperty( ResourceDownloader.PR_STRING_CONTENT_TYPE, con.getContentType() );
			
			Map	headers = con.getHeaderFields();
			
			Iterator it = headers.entrySet().iterator();
			
			while( it.hasNext()){
				
				Map.Entry	entry = (Map.Entry)it.next();
				
				String	key = (String)entry.getKey();
				Object	val	= entry.getValue();
				
				if ( key != null ){
					
					setProperty( "URL_" + key, val );
				}
			}
		}catch( Throwable e ){
			
			Debug.printStackTrace(e);
		}
	}
	
	public PasswordAuthentication
	getAuthentication(
		String		realm,
		URL			tracker )
	{
		if ( user_name == null || password == null ){
			
			String user_info = tracker.getUserInfo();
			
			if ( user_info == null ){
				
				return( null );
			}
			
			String	user_bit	= user_info;
			String	pw_bit		= "";
			
			int	pos = user_info.indexOf(':');
			
			if ( pos != -1 ){
				
				user_bit	= user_info.substring(0,pos);
				pw_bit		= user_info.substring(pos+1);
			}
			
			return( new PasswordAuthentication( user_bit, pw_bit.toCharArray()));
		}
		
		return( new PasswordAuthentication( user_name, password.toCharArray()));
	}
	
	public void
	setAuthenticationOutcome(
		String		realm,
		URL			tracker,
		boolean		success )
	{		
	}
	
	public void
	clearPasswords()
	{
	}
}
