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package org.xbib.net.mime;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Represents MIME message. MIME message parsing is done lazily using a
* pull parser.
*/
public class MimeMessage implements Closeable {
private static final Logger LOGGER = Logger.getLogger(MimeMessage.class.getName());
private final InputStream in;
private final Iterator it;
private boolean parsed;
private MimePart currentPart;
private int currentIndex;
private final List partsList = new ArrayList<>();
private final Map partsMap = new HashMap<>();
/**
* Creates a MIME message from the content's stream. The content stream
* is closed when EOF is reached.
*
* @param in MIME message stream
* @param boundary the separator for parts(pass it without --)
*/
public MimeMessage(InputStream in, String boundary) {
this.in = in;
MimeParser parser = new MimeParser(in, boundary);
it = parser.iterator();
//if (config.isParseEagerly()) {
// parseAll();
//}
}
/**
* Gets all the attachments by parsing the entire MIME message. Avoid
* this if possible since it is an expensive operation.
*
* @return list of attachments.
*/
public List getAttachments() throws MimeException, IOException {
if (!parsed) {
parseAll();
}
return partsList;
}
/**
* Creates nth attachment lazily. It doesn't validate
* if the message has so many attachments. To
* do the validation, the message needs to be parsed.
* The parsing of the message is done lazily and is done
* while reading the bytes of the part.
*
* @param index sequential order of the part. starts with zero.
* @return attachemnt part
*/
public MimePart getPart(int index) throws MimeException {
LOGGER.log(Level.FINE, "index={0}", index);
MimePart part = (index < partsList.size()) ? partsList.get(index) : null;
if (parsed && part == null) {
throw new MimeException("There is no " + index + " attachment part ");
}
if (part == null) {
// Parsing will done lazily and will be driven by reading the part
part = new MimePart(this);
partsList.add(index, part);
}
LOGGER.log(Level.FINE, "Got attachment at index=" + index + " attachment=" + part);
return part;
}
/**
* Creates a lazy attachment for a given Content-ID. It doesn't validate
* if the message contains an attachment with the given Content-ID. To
* do the validation, the message needs to be parsed. The parsing of the
* message is done lazily and is done while reading the bytes of the part.
*
* @param contentId Content-ID of the part, expects Content-ID without {@code <, >}
* @return attachemnt part
*/
public MimePart getPart(String contentId) throws MimeException {
LOGGER.log(Level.FINE, "Content-ID = " + contentId);
MimePart part = getDecodedCidPart(contentId);
if (parsed && part == null) {
throw new MimeException("There is no part with Content-ID = " + contentId);
}
if (part == null) {
// Parsing is done lazily and is driven by reading the part
part = new MimePart(this, contentId);
partsMap.put(contentId, part);
}
LOGGER.log(Level.FINE, "got part for Content-ID = " + contentId + " part = " + part);
return part;
}
// this is required for Indigo interop, it writes content-id without escaping
private MimePart getDecodedCidPart(String cid) {
MimePart part = partsMap.get(cid);
if (part == null) {
if (cid.indexOf('%') != -1) {
// TODO do not use URLDecoder
String tempCid = URLDecoder.decode(cid, StandardCharsets.UTF_8);
part = partsMap.get(tempCid);
}
}
return part;
}
/**
* Parses the whole MIME message eagerly
*/
public final void parseAll() throws MimeException, IOException {
while (makeProgress()) {
// Nothing to do
}
}
/**
* Closes all parsed {@link MimePart parts} and cleans up
* any resources that are held by this {@code MimeMessage} (for e.g. deletes temp files).
* This method is safe to call even if parsing of message failed.
*/
@Override
public void close() throws IOException {
close(partsList);
close(partsMap.values());
}
private void close(final Collection parts) throws IOException {
for (final MimePart part : parts) {
part.close();
}
}
/**
* Parses the MIME message in a pull fashion.
*
* @return false if the parsing is completed.
*/
public synchronized boolean makeProgress() throws MimeException, IOException {
if (!it.hasNext()) {
return false;
}
MimeEvent event = it.next();
switch (event.getEventType()) {
case START_MESSAGE:
LOGGER.log(Level.FINE, "MIMEEvent=" + MimeEvent.Type.START_MESSAGE);
break;
case START_PART:
LOGGER.log(Level.FINE, "MIMEEvent=" + MimeEvent.Type.START_PART);
break;
case HEADERS:
LOGGER.log(Level.FINE, "MIMEEvent=" + MimeEvent.Type.HEADERS);
Headers headers = (Headers) event;
MimeParser.InternetHeaders ih = headers.getHeaders();
List cids = ih.getHeader("content-id");
String cid = (cids != null) ? cids.get(0) : currentIndex + "";
if (cid.length() > 2 && cid.charAt(0) == '<') {
cid = cid.substring(1, cid.length() - 1);
}
MimePart listPart = (currentIndex < partsList.size()) ? partsList.get(currentIndex) : null;
MimePart mapPart = getDecodedCidPart(cid);
if (listPart == null && mapPart == null) {
currentPart = getPart(cid);
partsList.add(currentIndex, currentPart);
} else if (listPart == null) {
currentPart = mapPart;
partsList.add(currentIndex, mapPart);
} else if (mapPart == null) {
currentPart = listPart;
currentPart.setContentId(cid);
partsMap.put(cid, currentPart);
} else if (listPart != mapPart) {
throw new MimeException("ereated two different attachments using Content-ID and index");
}
currentPart.setHeaders(ih);
break;
case CONTENT:
LOGGER.log(Level.FINER, "MIMEEvent=" + MimeEvent.Type.CONTENT);
Content content = (Content) event;
ByteBuffer buf = content.getData();
currentPart.addBody(buf);
break;
case END_PART:
LOGGER.log(Level.FINE, "MIMEEvent=" + MimeEvent.Type.END_PART);
currentPart.doneParsing();
++currentIndex;
break;
case END_MESSAGE:
LOGGER.log(Level.FINE, "MIMEEvent=" + MimeEvent.Type.END_MESSAGE);
parsed = true;
try {
in.close();
} catch (IOException ioe) {
throw new MimeException(ioe);
}
break;
}
return true;
}
}