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org.apache.tika.parser.mail.MailContentHandler Maven / Gradle / Ivy
/*
* 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.tika.parser.mail;
import static org.apache.tika.utils.DateUtils.MIDDAY;
import static org.apache.tika.utils.DateUtils.UTC;
import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.codec.DecodeMonitor;
import org.apache.james.mime4j.codec.DecoderUtil;
import org.apache.james.mime4j.dom.address.Address;
import org.apache.james.mime4j.dom.address.AddressList;
import org.apache.james.mime4j.dom.address.Mailbox;
import org.apache.james.mime4j.dom.address.MailboxList;
import org.apache.james.mime4j.dom.field.AddressListField;
import org.apache.james.mime4j.dom.field.DateTimeField;
import org.apache.james.mime4j.dom.field.MailboxListField;
import org.apache.james.mime4j.dom.field.ParsedField;
import org.apache.james.mime4j.dom.field.UnstructuredField;
import org.apache.james.mime4j.field.LenientFieldParser;
import org.apache.james.mime4j.parser.ContentHandler;
import org.apache.james.mime4j.stream.BodyDescriptor;
import org.apache.james.mime4j.stream.Field;
import org.apache.tika.extractor.EmbeddedDocumentExtractor;
import org.apache.tika.extractor.EmbeddedDocumentUtil;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.SAXException;
/**
* Bridge between mime4j's content handler and the generic Sax content handler
* used by Tika. See
* http://james.apache.org/mime4j/apidocs/org/apache/james/mime4j/parser/ContentHandler.html
*/
class MailContentHandler implements ContentHandler {
//TIKA-1970 Mac Mail's format
private static final Pattern GENERAL_TIME_ZONE_NO_MINUTES_PATTERN =
Pattern.compile("(?:UTC|GMT)([+-])(\\d?\\d)\\Z");
//find a time ending in am/pm without a space: 10:30am and
//use this pattern to insert space: 10:30 am
private static final Pattern AM_PM = Pattern.compile("(?i)(\\d)([ap]m)\\b");
private static final DateFormat[] ALTERNATE_DATE_FORMATS = new DateFormat[] {
//note that the string is "cleaned" before processing:
//1) condense multiple whitespace to single space
//2) trim()
//3) strip out commas
//4) insert space before am/pm
//May 16 2016 1:32am
createDateFormat("MMM dd yy hh:mm a", null),
//this is a standard pattern handled by mime4j;
//but mime4j fails with leading whitespace
createDateFormat("EEE d MMM yy HH:mm:ss Z", UTC),
createDateFormat("EEE d MMM yy HH:mm:ss z", UTC),
createDateFormat("EEE d MMM yy HH:mm:ss", null),// no timezone
createDateFormat("EEEEE MMM d yy hh:mm a", null),// Sunday, May 15 2016 1:32 PM
//16 May 2016 at 09:30:32 GMT+1 (Mac Mail TIKA-1970)
createDateFormat("d MMM yy 'at' HH:mm:ss z", UTC), // UTC/Zulu
createDateFormat("yy-MM-dd HH:mm:ss", null),
createDateFormat("MM/dd/yy hh:mm a", null, false),
//now dates without times
createDateFormat("MMM d yy", MIDDAY, false),
createDateFormat("EEE d MMM yy", MIDDAY, false),
createDateFormat("d MMM yy", MIDDAY, false),
createDateFormat("yy/MM/dd", MIDDAY, false),
createDateFormat("MM/dd/yy", MIDDAY, false)
};
private static DateFormat createDateFormat(String format, TimeZone timezone) {
return createDateFormat(format, timezone, true);
}
private static DateFormat createDateFormat(String format, TimeZone timezone, boolean isLenient) {
SimpleDateFormat sdf =
new SimpleDateFormat(format, new DateFormatSymbols(Locale.US));
if (timezone != null) {
sdf.setTimeZone(timezone);
}
sdf.setLenient(isLenient);
return sdf;
}
private boolean strictParsing = false;
private XHTMLContentHandler handler;
private Metadata metadata;
private EmbeddedDocumentExtractor extractor;
private boolean inPart = false;
MailContentHandler(XHTMLContentHandler xhtml, Metadata metadata, ParseContext context, boolean strictParsing) {
this.handler = xhtml;
this.metadata = metadata;
this.strictParsing = strictParsing;
// Fetch / Build an EmbeddedDocumentExtractor with which
// to handle/process the parts/attachments
// Was an EmbeddedDocumentExtractor explicitly supplied?
this.extractor = EmbeddedDocumentUtil.getEmbeddedDocumentExtractor(context);
}
public void body(BodyDescriptor body, InputStream is) throws MimeException,
IOException {
// use a different metadata object
// in order to specify the mime type of the
// sub part without damaging the main metadata
Metadata submd = new Metadata();
submd.set(Metadata.CONTENT_TYPE, body.getMimeType());
submd.set(Metadata.CONTENT_ENCODING, body.getCharset());
try {
if (extractor.shouldParseEmbedded(submd)) {
// Wrap the InputStream before passing on, as the James provided
// one misses many features we might want eg mark/reset
TikaInputStream tis = TikaInputStream.get(is);
extractor.parseEmbedded(tis, handler, submd, false);
}
} catch (SAXException e) {
throw new MimeException(e);
}
}
public void endBodyPart() throws MimeException {
try {
handler.endElement("p");
handler.endElement("div");
} catch (SAXException e) {
throw new MimeException(e);
}
}
public void endHeader() throws MimeException {
}
public void startMessage() throws MimeException {
try {
handler.startDocument();
} catch (SAXException e) {
throw new MimeException(e);
}
}
public void endMessage() throws MimeException {
try {
handler.endDocument();
} catch (SAXException e) {
throw new MimeException(e);
}
}
public void endMultipart() throws MimeException {
inPart = false;
}
public void epilogue(InputStream is) throws MimeException, IOException {
}
/**
* Header for the whole message or its parts
*
* @see
* http://james.apache.org/mime4j/apidocs/org/apache/james/mime4j/parser/
* Field.html
*/
public void field(Field field) throws MimeException {
// inPart indicates whether these metadata correspond to the
// whole message or its parts
if (inPart) {
return;
}
try {
String fieldname = field.getName();
ParsedField parsedField = LenientFieldParser.getParser().parse(
field, DecodeMonitor.SILENT);
if (fieldname.equalsIgnoreCase("From")) {
MailboxListField fromField = (MailboxListField) parsedField;
MailboxList mailboxList = fromField.getMailboxList();
if (fromField.isValidField() && mailboxList != null) {
for (Address address : mailboxList) {
String from = getDisplayString(address);
metadata.add(Metadata.MESSAGE_FROM, from);
metadata.add(TikaCoreProperties.CREATOR, from);
}
} else {
String from = stripOutFieldPrefix(field, "From:");
if (from.startsWith("<")) {
from = from.substring(1);
}
if (from.endsWith(">")) {
from = from.substring(0, from.length() - 1);
}
metadata.add(Metadata.MESSAGE_FROM, from);
metadata.add(TikaCoreProperties.CREATOR, from);
}
} else if (fieldname.equalsIgnoreCase("Subject")) {
metadata.set(TikaCoreProperties.TRANSITION_SUBJECT_TO_DC_TITLE,
((UnstructuredField) parsedField).getValue());
} else if (fieldname.equalsIgnoreCase("To")) {
processAddressList(parsedField, "To:", Metadata.MESSAGE_TO);
} else if (fieldname.equalsIgnoreCase("CC")) {
processAddressList(parsedField, "Cc:", Metadata.MESSAGE_CC);
} else if (fieldname.equalsIgnoreCase("BCC")) {
processAddressList(parsedField, "Bcc:", Metadata.MESSAGE_BCC);
} else if (fieldname.equalsIgnoreCase("Date")) {
DateTimeField dateField = (DateTimeField) parsedField;
Date date = dateField.getDate();
if (date == null) {
date = tryOtherDateFormats(field.getBody());
}
metadata.set(TikaCoreProperties.CREATED, date);
} else {
metadata.add(Metadata.MESSAGE_RAW_HEADER_PREFIX+parsedField.getName(),
field.getBody());
}
} catch (RuntimeException me) {
if (strictParsing) {
throw me;
}
}
}
private static synchronized Date tryOtherDateFormats(String text) {
if (text == null) {
return null;
}
text = text.replaceAll("\\s+", " ").trim();
//strip out commas
text = text.replaceAll(",", "");
Matcher matcher = GENERAL_TIME_ZONE_NO_MINUTES_PATTERN.matcher(text);
if (matcher.find()) {
text = matcher.replaceFirst("GMT$1$2:00");
}
matcher = AM_PM.matcher(text);
if (matcher.find()) {
text = matcher.replaceFirst("$1 $2");
}
for (DateFormat format : ALTERNATE_DATE_FORMATS) {
try {
return format.parse(text);
} catch (ParseException e) {
}
}
return null;
}
private void processAddressList(ParsedField field, String addressListType,
String metadataField) throws MimeException {
AddressListField toField = (AddressListField) field;
if (toField.isValidField()) {
AddressList addressList = toField.getAddressList();
for (Address address : addressList) {
metadata.add(metadataField, getDisplayString(address));
}
} else {
String to = stripOutFieldPrefix(field,
addressListType);
for (String eachTo : to.split(",")) {
metadata.add(metadataField, eachTo.trim());
}
}
}
private String getDisplayString(Address address) {
if (address instanceof Mailbox) {
Mailbox mailbox = (Mailbox) address;
String name = mailbox.getName();
if (name != null && name.length() > 0) {
name = DecoderUtil.decodeEncodedWords(name, DecodeMonitor.SILENT);
return name + " <" + mailbox.getAddress() + ">";
} else {
return mailbox.getAddress();
}
} else {
return address.toString();
}
}
public void preamble(InputStream is) throws MimeException, IOException {
}
public void raw(InputStream is) throws MimeException, IOException {
}
public void startBodyPart() throws MimeException {
try {
handler.startElement("div", "class", "email-entry");
handler.startElement("p");
} catch (SAXException e) {
throw new MimeException(e);
}
}
public void startHeader() throws MimeException {
// TODO Auto-generated method stub
}
public void startMultipart(BodyDescriptor descr) throws MimeException {
inPart = true;
}
private String stripOutFieldPrefix(Field field, String fieldname) {
String temp = field.getRaw().toString();
int loc = fieldname.length();
while (temp.charAt(loc) == ' ') {
loc++;
}
return temp.substring(loc);
}
}
