/*
* 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 java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Set;
import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.parser.MimeStreamParser;
import org.apache.james.mime4j.stream.MimeConfig;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.TaggedInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* Uses apache-mime4j to parse emails. Each part is treated with the
* corresponding parser and displayed within elements.
* <p>
* A {@link MimeEntityConfig} object can be passed in the parsing context
* to better control the parsing process.
*
* @author jnioche@digitalpebble.com
**/
public class RFC822Parser extends AbstractParser {
private static final Set<MediaType> SUPPORTED_TYPES = Collections
.singleton(MediaType.parse("message/rfc822"));
public Set<MediaType> getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
public void parse(InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context) throws IOException,
SAXException, TikaException {
// Get the mime4j configuration, or use a default one
MimeConfig config = new MimeConfig();
config.setMaxLineLen(10000); // max length of any individual header
config = context.get(MimeConfig.class, config);
MimeStreamParser parser = new MimeStreamParser(config);
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
MailContentHandler mch = new MailContentHandler(
xhtml, metadata, config.isStrictParsing());
parser.setContentHandler(mch);
parser.setContentDecoding(true);
TaggedInputStream tagged = TaggedInputStream.get(stream);
try {
parser.parse(tagged);
} catch (IOException e) {
tagged.throwIfCauseOf(e);
throw new TikaException("Failed to parse an email message", e);
} catch (MimeException e) {
// Unwrap the exception in case it was not thrown by mime4j
Throwable cause = e.getCause();
if (cause instanceof TikaException) {
throw (TikaException) cause;
} else if (cause instanceof SAXException) {
throw (SAXException) cause;
} else {
throw new TikaException("Failed to parse an email message", e);
}
}
}
}