POP3ExportMbox.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.net.examples.mail;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.net.pop3.POP3Client;
import org.apache.commons.net.pop3.POP3MessageInfo;
import org.apache.commons.net.pop3.POP3SClient;
/**
* This is an example program demonstrating how to use the POP3[S]Client class. This program connects to a POP3[S] server and writes the messages to an mbox
* file.
* <p>
* The code currently assumes that POP3Client decodes the POP3 data as iso-8859-1. The POP3 standard only allows for ASCII so in theory iso-8859-1 should be OK.
* However, it appears that actual POP3 implementations may return 8bit data that is outside the ASCII range; this may result in loss of data when the mailbox
* is created.
* <p>
* See main() method for usage details
*/
public final class POP3ExportMbox {
private static final Pattern PATFROM = Pattern.compile(">*From "); // unescaped From_
public static void main(final String[] args) {
int argIdx;
String file = null;
for (argIdx = 0; argIdx < args.length; argIdx++) {
if (!args[argIdx].equals("-F")) {
break;
}
file = args[++argIdx];
}
final int argCount = args.length - argIdx;
if (argCount < 3) {
System.err.println("Usage: POP3Mail [-F file/directory] <server[:port]> <user> <password|-|*|VARNAME> [TLS [true=implicit]]");
System.exit(1);
}
final String[] arg0 = args[argIdx++].split(":");
final String server = arg0[0];
final String user = args[argIdx++];
String password = args[argIdx++];
// prompt for the password if necessary
try {
password = Utils.getPassword(user, password);
} catch (final IOException e1) {
System.err.println("Could not retrieve password: " + e1.getMessage());
return;
}
final String proto = argCount > 3 ? args[argIdx++] : null;
final boolean implicit = argCount > 4 && Boolean.parseBoolean(args[argIdx++]);
final POP3Client pop3;
if (proto != null) {
System.out.println("Using secure protocol: " + proto);
pop3 = new POP3SClient(proto, implicit);
} else {
pop3 = new POP3Client();
}
final int port;
if (arg0.length == 2) {
port = Integer.parseInt(arg0[1]);
} else {
port = pop3.getDefaultPort();
}
System.out.println("Connecting to server " + server + " on " + port);
// We want to timeout if a response takes longer than 60 seconds
pop3.setDefaultTimeout(60000);
try {
pop3.connect(server);
} catch (final IOException e) {
System.err.println("Could not connect to server.");
e.printStackTrace();
return;
}
try {
if (!pop3.login(user, password)) {
System.err.println("Could not login to server. Check password.");
pop3.disconnect();
return;
}
final POP3MessageInfo status = pop3.status();
if (status == null) {
System.err.println("Could not retrieve status.");
pop3.logout();
pop3.disconnect();
return;
}
System.out.println("Status: " + status);
final int count = status.number;
if (file != null) {
System.out.println("Getting messages: " + count);
final File mbox = new File(file);
if (mbox.isDirectory()) {
System.out.println("Writing dir: " + mbox);
// Currently POP3Client uses iso-8859-1
for (int i = 1; i <= count; i++) {
try (final OutputStreamWriter fw = new OutputStreamWriter(new FileOutputStream(new File(mbox, i + ".eml")),
StandardCharsets.ISO_8859_1)) {
writeFile(pop3, fw, i);
}
}
} else {
System.out.println("Writing file: " + mbox);
// Currently POP3Client uses iso-8859-1
try (final OutputStreamWriter fw = new OutputStreamWriter(new FileOutputStream(mbox), StandardCharsets.ISO_8859_1)) {
for (int i = 1; i <= count; i++) {
writeMbox(pop3, fw, i);
}
}
}
}
pop3.logout();
pop3.disconnect();
} catch (final IOException e) {
e.printStackTrace();
}
}
private static boolean startsWith(final String input, final Pattern pat) {
final Matcher m = pat.matcher(input);
return m.lookingAt();
}
private static void writeFile(final POP3Client pop3, final OutputStreamWriter fw, final int i) throws IOException {
try (final BufferedReader r = (BufferedReader) pop3.retrieveMessage(i)) {
String line;
while ((line = r.readLine()) != null) {
fw.write(line);
fw.write("\n");
}
}
}
private static void writeMbox(final POP3Client pop3, final OutputStreamWriter fw, final int i) throws IOException {
final SimpleDateFormat DATE_FORMAT // for mbox From_ lines
= new SimpleDateFormat("EEE MMM dd HH:mm:ss yyyy");
final String replyTo = "MAILER-DAEMON"; // default
final Date received = new Date();
try (final BufferedReader r = (BufferedReader) pop3.retrieveMessage(i)) {
fw.append("From ");
fw.append(replyTo);
fw.append(' ');
fw.append(DATE_FORMAT.format(received));
fw.append("\n");
String line;
while ((line = r.readLine()) != null) {
if (startsWith(line, PATFROM)) {
fw.write(">");
}
fw.write(line);
fw.write("\n");
}
fw.write("\n");
}
}
}