PC World Komputer 1995 November/PCWK1195.iso/inne/win95/sieciowe/hotja32.lzh/hotjava/classsrc/net/smtp/smtpclient.java

Text File | 1995-08-11 | 5KB | 204 lines

/*
 * @(#)SmtpClient.java    1.6 95/05/21 James Gosling
 *
 * Copyright (c) 1995 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for NON-COMMERCIAL purposes and without fee is hereby
 * granted provided that this copyright notice appears in all copies. Please
 * refer to the file "copyright.html" for further important copyright and
 * licensing information.
 *
 * 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.
 */

package net.smtp;

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

/**
 * This class implements the SMTP client.
 * You can send a piece of mail by creating a new SmtpClient, calling
 * the "to" method to add destinations, calling "from" to name the
 * sender, calling startMessage to return a stream to which you write
 * the message (with RFC733 headers) and then you finally close the Smtp
 * Client.
 *
 * @version    1.17, 12 Dec 1994
 * @author    James Gosling
 */

public class SmtpClient extends TransferProtocolClient {
    SmtpPrintStream message;

    /**
     * issue the QUIT command to the SMTP server and close the connection.
     */
    public void closeServer() {
    if (serverIsOpen()) {
        closeMessage();
        issueCommand("QUIT\r\n", 221);
        super.closeServer();
    }
    }

    void issueCommand(String cmd, int expect) {
    sendServer(cmd);
    int reply;
    while ((reply = readServerResponse()) != expect)
        if (reply != 220) {
        throw new SmtpProtocolException(getResponseString());
        }
    }

    private void toCanonical(String s) {
    issueCommand("rcpt to: " + s + "\r\n", 250);
    }

    public void to(String s) {
    int st = 0;
    int limit = s.length();
    int pos = 0;
    int lastnonsp = 0;
    int parendepth = 0;
    boolean ignore = false;
    while (pos < limit) {
        int c = s.charAt(pos);
        if (parendepth > 0) {
        if (c == '(')
            parendepth++;
        else if (c == ')')
            parendepth--;
        if (parendepth == 0)
            if (lastnonsp > st)
            ignore = true;
            else
            st = pos + 1;
        } else if (c == '(')
        parendepth++;
        else if (c == '<')
        st = lastnonsp = pos + 1;
        else if (c == '>')
        ignore = true;
        else if (c == ',') {
        if (lastnonsp > st)
            toCanonical(s.substring(st, lastnonsp));
        st = pos + 1;
        ignore = false;
        } else {
        if (c > ' ' && !ignore)
            lastnonsp = pos + 1;
        else if (st == pos)
            st++;
        }
        pos++;
    }
    if (lastnonsp > st)
        toCanonical(s.substring(st, lastnonsp));
    }

    public void from(String s) {
    issueCommand("mail from: " + s + "\r\n", 250);
    }

    /** open a SMTP connection to host <i>host</i>. */
    private void openServer(String host) {
    openServer(host, 25);
    issueCommand("helo "+InetAddress.localHostName+"\r\n", 250);
    }

    public PrintStream startMessage() {
    issueCommand("data\r\n", 354);
    return message = new SmtpPrintStream(serverOutput, this);
    }

    void closeMessage() {
    if (message != null)
        message.close();
    }

    /** New SMTP client connected to host <i>host</i>. */
    public SmtpClient (String host) {
    super();
    if (host != null) {
        try {
        openServer(host);
        return;
        } catch(Exception e) {
        }
    }
    try {
        String s = System.getenv("MAILHOST");
        if (s != null) {
        openServer(s);
        return;
        }
    } catch(Exception e) {
    }
    try {
        openServer("localhost");
    } catch(Exception e) {
        openServer("mailhost");
    }
    }

    /** Create an uninitialized SMTP client. */
    public SmtpClient () {
    this(null);
    }
}

class SmtpPrintStream extends java.io.PrintStream {
    private SmtpClient target;
    private int lastc = '\n';

    SmtpPrintStream (OutputStream fos, SmtpClient cl) {
    super(fos);
    target = cl;
    }

    public void close() {
    if (target == null)
        return;
    if (lastc != '\n') {
        write('\r');
        write('\n');
    }
    target.issueCommand(".\r\n", 250);
    target.message = null;
    out = null;
    target = null;
    }

    public void write(int b) {
    if (lastc == '\n' && b == '.')
        out.write('.');
    out.write(b);
    lastc = b;
    }

    public void write(byte b[], int off, int len) {
    int lc = lastc;
    while (--len >= 0) {
        int c = b[off++];
        if (lc == '\n' && c == '.')
        out.write('.');
        out.write(c);
        lc = c;
    }
    lastc = lc;
    }
    public void print(String s) {
    int len = s.length();
    for (int i = 0; i < len; i++)
        write(s.charAt(i));
    }
}