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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.mail;
import jakarta.mail.Authenticator;
import jakarta.mail.Flags;
import jakarta.mail.MessagingException;
import jakarta.mail.NoSuchProviderException;
import jakarta.mail.Part;
import jakarta.mail.Session;
import jakarta.mail.Store;
import jakarta.mail.internet.MimeBodyPart;
import jakarta.mail.internet.MimeUtility;
import jodd.util.CharUtil;
import jodd.util.StringPool;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Properties;
import java.util.function.Consumer;
/**
* Email utilities.
*/
public class EmailUtil {
protected static final String ATTR_CHARSET = "charset=";
static final String NO_NAME = "no-name";
/**
* Extracts MIME type from content type.
*
* @param contentType MIME type.
* @return MIME type for the given content type.
*/
//TODO: should this always return lowercase or always uppercase?
public static String extractMimeType(final String contentType) {
final int ndx = contentType.indexOf(';');
final String mime;
if (ndx != -1) {
mime = contentType.substring(0, ndx);
} else {
mime = contentType;
}
return mime;
}
/**
* Extracts encoding from a given content type.
*
* @param contentType content type.
* @return Encoding from the content type. May return {@code null} if encoding is not specified in content type.
*/
//TODO: should this always return lowercase or always uppercase?
public static String extractEncoding(final String contentType) {
int ndx = contentType.indexOf(';');
final String charset = ndx != -1 ? contentType.substring(ndx + 1) : StringPool.EMPTY;
String encoding = null;
ndx = charset.indexOf(ATTR_CHARSET);
if (ndx != -1) {
ndx += ATTR_CHARSET.length();
final int len = charset.length();
if (charset.charAt(ndx) == '"') {
ndx++;
}
final int start = ndx;
while (ndx < len) {
final char c = charset.charAt(ndx);
if ((c == '"') || (CharUtil.isWhitespace(c)) || (c == ';')) {
break;
}
ndx++;
}
encoding = charset.substring(start, ndx);
}
return encoding;
}
/**
* Extracts encoding from a given content type.
*
* @param contentType content type.
* @param defaultEncoding Default encoding to be used if extract returns {@code null}.
* If defaultEncoding is {@code null}, default encoding will be used.
* @return Encoding from the content type.
* @see #extractEncoding(String)
*/
public static String extractEncoding(final String contentType, String defaultEncoding) {
String encoding = extractEncoding(contentType);
if (encoding == null) {
if (defaultEncoding == null) {
defaultEncoding = "UTF-8";
}
encoding = defaultEncoding;
}
return encoding;
}
/**
* Correctly resolves file name from the message part.
* Thanx to: Flavio Pompermaier
*
* @param part {@link Part} to decode file name from.
* @return String containing file name.
*/
public static String resolveFileName(final Part part) throws MessagingException {
if (!(part instanceof MimeBodyPart)) {
return part.getFileName();
}
final String contentType = part.getContentType();
String ret;
try {
ret = MimeUtility.decodeText(part.getFileName());
} catch (final Exception ex) {
// String[] contentId = part.getHeader("Content-ID");
// if (contentId != null && contentId.length > 0) {
final String contentId = ((MimeBodyPart) part).getContentID();
if (contentId != null) {
ret = contentId + contentTypeForFileName(contentType);
} else {
ret = defaultFileName(contentType);
}
}
return ret;
}
private static String contentTypeForFileName(final String contentType) {
return StringPool.DOT + contentType.substring(contentType.lastIndexOf("/") + 1, contentType.length());
}
private static String defaultFileName(final String contentType) {
return NO_NAME + contentTypeForFileName(contentType);
}
/**
* @param protocol Protocol such as {@link ImapServer#PROTOCOL_IMAP} or {@link Pop3Server#PROTOCOL_POP3}.
* @param sessionProperties Session properties to use.
* @param authenticator Authenticator which contains necessary authentication for server.
* @param debugConsumer
* @return {@link ReceiveMailSession}.
*/
public static ReceiveMailSession createSession(final String protocol, final Properties sessionProperties, final Authenticator authenticator, final File attachmentStorage, final Consumer debugConsumer) {
final Session session = Session.getInstance(sessionProperties, authenticator);
if (debugConsumer != null) {
session.setDebugOut(new PrintStream(new ByteArrayOutputStream() {
@Override
public void flush() throws IOException {
final String record;
synchronized (this) {
super.flush();
record = this.toString().trim();
super.reset();
if (record.length() == 0 || record.equals(System.lineSeparator())) {
// avoid empty records
return;
}
debugConsumer.accept(record);
}
}
}, true));
}
final Store store;
try {
store = session.getStore(protocol);
} catch (final NoSuchProviderException nspex) {
final String errMsg = String.format("Failed to create %s session", protocol);
throw new MailException(errMsg, nspex);
}
return new ReceiveMailSession(session, store, attachmentStorage);
}
/**
* Check whether flags is a empty flags
*
* @param flags a flags of message to check
* @return whether the flags is empty
*/
public static boolean isEmptyFlags(final Flags flags) {
if (flags == null) {
return true;
}
final Flags.Flag[] systemFlags = flags.getSystemFlags();
if (systemFlags != null && systemFlags.length > 0) {
return false;
}
final String[] userFlags = flags.getUserFlags();
if (userFlags != null && userFlags.length > 0) {
return false;
}
return true;
}
}
