/*
 * @(#)FingerServlet.java	1.12 97/05/22
 * 
 * Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 * 
 * CopyrightVersion 1.0
 */

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

import javax.servlet.*;
import javax.servlet.http.*;

/**
 * Finger servlet. This servlet uses the finger protocol to query
 * information about users on specified hosts. The query string
 * parameters <tt>user</tt>, <tt>hosts</tt>, and <tt>verbose</tt>
 * can be used to specify the user and hosts to query. The parameter
 * <tt>user</tt> is the user name, <tt>hosts</tt> is a comma-separated
 * list of host names to query, and <tt>verbose</tt> if specified will
 * cause verbose output to be generated. For example,
 * <pre>
 *     http:/goa/finger.html?user=dac&hosts=eno,doppio&verbose=yes
 * </pre>
 * This URL will request full information about user 'dac' on both
 * hosts 'eno' and 'doppio'.
 *
 * @version 	1.12, 05/22/97
 * @author 	David Connelly
 */
public
class FingerServlet extends HttpServlet {
    /*
     * Port number for finger daemon.
     */
    static final int FINGER_PORT = 79;
    private static final String timeoutMessage = "Timeout reading from server";

    /**
     * Handles a single finger request from the client.
     */
    public void doGet (HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException
    {
	String user = req.getParameter("user");
	String hosts = req.getParameter("hosts");
	String verbose = req.getParameter("verbose");

	res.setContentType("text/html");

	ServletOutputStream out = res.getOutputStream();
	out.println("<html>");
	out.println("<head><title>Finger Servlet</title></head>");
	out.println("<body>");
	out.println("<h2>Finger results:</h2>");
	out.println("<pre>");
	if (hosts == null) {
	    finger(out, user, null, "yes".equalsIgnoreCase(verbose)) ;
	} else {
	    StringTokenizer st = new StringTokenizer(hosts, ",");
	    while (st.hasMoreTokens()) {
		String host = st.nextToken();
		out.println("[" + host + "]");
		try {
		    finger(out, user, host, "yes".equalsIgnoreCase(verbose));
		} catch (IOException e) {
		    out.println(e.toString());
		}
		out.println();
	    }
	}
	out.println("</pre>");
	out.println("</body></html>");
    }

    /*
     * Sends finger output for a user and host to the specified output
     * stream.
     */
    private void finger(ServletOutputStream out, String user, String host,
		boolean verbose)
	throws IOException
    {
	// open connection to finger daemon
	Socket s;
	if (host == null) {
	    s = new Socket(InetAddress.getLocalHost(), FINGER_PORT);
	} else {
	    s = new Socket(host, FINGER_PORT);
	}
	// send finger command
	PrintStream socketOut = new PrintStream(s.getOutputStream());
	if (verbose) {
	    socketOut.print("/W ");
	}
	if (user != null) {
	    socketOut.print(user);
	}
	socketOut.print("\r\n");
	socketOut.flush();
	// copy results to output stream
	// s.setSoTimeout(30000);
	InputStream in = s.getInputStream();
	byte[] buf = new byte[2048];
	int len;
	try {
	    while ((len = in.read(buf, 0, buf.length)) != -1) {
		out.write(buf, 0, len);
	    }
	}
	catch (InterruptedIOException ioe) {
	    timeoutMessage.getBytes(0, timeoutMessage.length(), buf, 0);
	    out.write(buf, 0, timeoutMessage.length());
	}
	finally {
	    socketOut.close();
	    s.close();
	}
    }
}
