1 /*
 2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 package org.openjdk.skara.email;
24 
25 import java.io.*;
26 import java.net.Socket;
27 import java.time.format.DateTimeFormatter;
28 import java.util.regex.Pattern;
29 
30 /**
31  * Limited SMTP client implementation - only compatibility requirement (currently) is the OpenJDK
32  * mailing list servers.
33  */
34 public class SMTP {
35     private static Pattern initReply = Pattern.compile("220 .*");
36     private static Pattern ehloReply = Pattern.compile("^250 HELP$");
37     private static Pattern mailReply = Pattern.compile("^250 .*");
38     private static Pattern rcptReply = Pattern.compile("^250 .*");
39     private static Pattern dataReply = Pattern.compile("354 Enter.*");
40     private static Pattern doneReply = Pattern.compile("250 .*");
41 
42     public static void send(String server, EmailAddress recipient, Email email) throws IOException {
43         var port = 25;
44         if (server.contains(":")) {
45             var parts = server.split(":", 2);
46             server = parts[0];
47             port = Integer.parseInt(parts[1]);
48         }
49         try (var socket = new Socket(server, port);
50              var out = new OutputStreamWriter(socket.getOutputStream());
51              var in = new InputStreamReader(socket.getInputStream())) {
52 
53             var session = new SMTPSession(in, out);
54 
55             session.waitForPattern(initReply);
56             session.sendCommand("EHLO " + email.sender().domain(), ehloReply);
57             session.sendCommand("MAIL FROM:" + email.sender().address(), mailReply);
58             session.sendCommand("RCPT TO:<" + recipient.address() + ">", rcptReply);
59             session.sendCommand("DATA", dataReply);
60             session.sendCommand("From: " + email.author());
61             session.sendCommand("Message-Id: " + email.id());
62             session.sendCommand("Date: " + email.date().format(DateTimeFormatter.RFC_1123_DATE_TIME));
63             session.sendCommand("Sender: " + email.sender());
64             session.sendCommand("To: " + recipient);
65             for (var header : email.headers()) {
66                 session.sendCommand(header + ": " + email.headerValue(header));
67             }
68             session.sendCommand("Subject: " + email.subject());
69             session.sendCommand("");
70             session.sendCommand(email.body());
71             session.sendCommand(".", doneReply);
72             session.sendCommand("QUIT");
73         }
74     }
75 }