// Mailer.java - A class for e-mailing.
//
// Copyright (C) 2000-2002  Smart Software Consulting
//
// 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.
//
// Smart Software Consulting
// 1688 Silverwood Court
// Danville, CA  94526-3079
// USA
//
// http://www.smartsc.com
//

package com.smartsc.util;

import java.io.BufferedOutputStream;
import java.io.InputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import java.util.Enumeration;
import java.util.Hashtable;

public class Mailer
{
	public static void send( Hashtable headers, File f)
	throws IOException
	{
		send( headers, new FileInputStream( f));
	}

	public static void send( Hashtable headers, InputStream is)
	throws IOException
	{
		OutputStream os =
			new BufferedOutputStream(
				send( headers), BUFFER_SIZE);

		// Send input stream
		byte[] buf = new byte[512];
		for( int bytesRead = is.read( buf);
			bytesRead != -1;
			bytesRead = is.read( buf) )
		{
			os.write( buf, 0, bytesRead);
		}

		// Close streams
		is.close();
		os.close();
	}

	public static OutputStream send( Hashtable headers)
	throws java.io.IOException
	{
		URL url;
		try
		{
			url = new URL( "mailto", null, (String)headers.get( HEADER_TO));
		}
		catch( NullPointerException npe)
		{
			throw new MalformedURLException( "No recipient specified.");
		}

		URLConnection urlConn = url.openConnection();
		urlConn.setDoOutput( true);
		urlConn.connect();

		OutputStream os = urlConn.getOutputStream();

		// Send headers
		Enumeration enum = headers.keys();
		while( enum.hasMoreElements())
		{
			String header = (String)enum.nextElement();
			if( !HEADER_TO.equals( header ))
			{
				byte[] headerBytes = header.getBytes();
				byte[] valueBytes  = ((String)headers.get( header)).getBytes();
				os.write( headerBytes);
				os.write( HEADER_SEPARATOR);
				os.write( valueBytes);
				os.write( CRLF);
			}
		}
		os.write( CRLF);

		return os;
	}

	public static final int BUFFER_SIZE = 512;
	public static final byte[] HEADER_SEPARATOR = { (byte)':', (byte)' ' };
	public static final byte[] CRLF = { (byte)'\r', (byte)'\n' };

	public static final String HEADER_FROM    = "From";
	public static final String HEADER_TO      = "To";
	public static final String HEADER_CC      = "Cc";
	public static final String HEADER_BCC     = "Bcc";
	public static final String HEADER_SUBJECT = "Subject";
	public static final String HEADER_DATE    = "Date";
}