Java tutorial
/* * Copyright (c) 2010-2011, Martijn Brinkers, Djigzo. * * This file is part of Djigzo email encryption. * * Djigzo is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License * version 3, 19 November 2007 as published by the Free Software * Foundation. * * Djigzo 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public * License along with Djigzo. If not, see <http://www.gnu.org/licenses/> * * Additional permission under GNU AGPL version 3 section 7 * * If you modify this Program, or any covered work, by linking or * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, * wsdl4j-1.6.1.jar (or modified versions of these libraries), * containing parts covered by the terms of Eclipse Public License, * tyrex license, freemarker license, dom4j license, mx4j license, * Spice Software License, Common Development and Distribution License * (CDDL), Common Public License (CPL) the licensors of this Program grant * you additional permission to convey the resulting work. */ package mitm.common.postfix; import java.io.File; import java.io.IOException; import java.io.StringReader; import java.util.LinkedList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import mitm.common.locale.CharacterEncoding; import mitm.common.util.Check; import mitm.common.util.MiscStringUtils; import mitm.common.util.ProcessRunner; import mitm.common.util.SizeLimitedOutputStream; import mitm.common.util.SizeUtils; import org.apache.commons.io.IOUtils; import org.apache.commons.io.LineIterator; import org.apache.commons.io.output.ByteArrayOutputStream; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.math.NumberUtils; import org.apache.commons.lang.text.StrBuilder; import org.apache.commons.lang.time.DateUtils; public class SaslPasswordManager { /* * Parts of the SASL_PASSWORD_PATTERN. Used to make reading the regular expression * somewhat easier */ private final static String SERVER_PATTERN = "([\\w.-]++)"; private final static String PORT_PATTERN = ":?\\s*(\\d{0,5})"; private final static String USERNAME_PASSWORD_PATTERN = "([^:]+)\\s*:?\\s*(.*)"; /* * Pattern for parsing sasl password lines: * * Example: * * [smtp.gmail.com]:587 test@gmail.com:secret! */ private final static Pattern SASL_PASSWORD_PATTERN = Pattern.compile("\\s*(\\[)?\\s*" + SERVER_PATTERN + "\\s*(\\])?\\s*" + PORT_PATTERN + "\\s*" + USERNAME_PASSWORD_PATTERN); /* * The maximum time a command may run after which it is destroyed */ private final static long TIMEOUT = 30 * DateUtils.MILLIS_PER_SECOND; /* * Maximal size of a command output (just to protect against a runaway command) */ private final static long MAX_OUTPUT_LENGTH = SizeUtils.KB * 10; /* * The external command (script or bin) to run for configuring Fetchmail */ private final File externalCommand; public SaslPasswordManager(File externalCommand) { Check.notNull(externalCommand, "externalCommand"); this.externalCommand = externalCommand; } /* * Returns the content of the SASL password file by executing an external process * that returns the content of the SASL password file. */ private String getSaslPasswordContent() throws IOException { List<String> cmd = new LinkedList<String>(); cmd.add(externalCommand.getPath()); cmd.add("get"); ProcessRunner runner = new ProcessRunner(); runner.setTimeout(TIMEOUT); ByteArrayOutputStream bos = new ByteArrayOutputStream(); SizeLimitedOutputStream slos = new SizeLimitedOutputStream(bos, MAX_OUTPUT_LENGTH, true); runner.setOutput(slos); runner.run(cmd); return MiscStringUtils.toAsciiString(bos.toByteArray()); } /* * Sets the content of the SASL password file by executing an external process * that reads the content of the SASL password file from the standard in. */ private void setSaslPasswordContent(String content) throws IOException { List<String> cmd = new LinkedList<String>(); cmd.add(externalCommand.getPath()); cmd.add("set"); ProcessRunner runner = new ProcessRunner(); runner.setTimeout(TIMEOUT); /* * The content will be piped to the process */ runner.setInput(IOUtils.toInputStream(content, CharacterEncoding.US_ASCII)); runner.run(cmd); } /* * Parses the SASL password file contents */ protected static List<SaslPassword> parseContent(String input) { List<SaslPassword> passwords = new LinkedList<SaslPassword>(); if (StringUtils.isEmpty(input)) { return passwords; } LineIterator lineIterator = IOUtils.lineIterator(new StringReader(input)); while (lineIterator.hasNext()) { String line = lineIterator.nextLine(); if (!StringUtils.isBlank(line)) { Matcher m = SASL_PASSWORD_PATTERN.matcher(line); if (m.matches()) { boolean mxLookup = !("[".equals(m.group(1)) && "]".equals(m.group(3))); String server = StringUtils.trim(m.group(2)); Integer port = NumberUtils.toInt(StringUtils.trim(m.group(4)), 0); String username = StringUtils.trim(m.group(5)); String password = StringUtils.trim(m.group(6)); SaslPassword saslPassword = new SaslPassword(); saslPassword.setMxLookup(mxLookup); saslPassword.setServer(server); saslPassword.setPort(port != 0 ? port : null); saslPassword.setUsername(username); saslPassword.setPassword(password); passwords.add(saslPassword); } } } return passwords; } /* * Creates sasl password content */ protected static String createContent(List<SaslPassword> passwords) { StrBuilder content = new StrBuilder(256); if (passwords != null) { for (SaslPassword password : passwords) { if (!password.isMxLookup()) { content.append("["); } content.append(password.getServer()); if (!password.isMxLookup()) { content.append("]"); } if (password.getPort() != null) { content.append(":").append(password.getPort()); } content.append(" ").append(password.getUsername()); content.append(":").append(password.getPassword()); content.appendNewLine(); } } return content.toString(); } public List<SaslPassword> getSaslPasswords() throws IOException { return parseContent(getSaslPasswordContent()); } public void setSaslPasswords(List<SaslPassword> passwords) throws IOException { setSaslPasswordContent(createContent(passwords)); } }