/*
* 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;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.Set;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.CloseShieldInputStream;
import org.apache.tika.io.IOUtils;
import org.apache.tika.io.TemporaryResources;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.sax.TaggedContentHandler;
import org.apache.tika.sax.TeeContentHandler;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class NetworkParser extends AbstractParser {
private final URI uri;
private final Set<MediaType> supportedTypes;
public NetworkParser(URI uri, Set<MediaType> supportedTypes) {
this.uri = uri;
this.supportedTypes = supportedTypes;
}
public NetworkParser(URI uri) {
this(uri, Collections.singleton(MediaType.OCTET_STREAM));
}
public Set<MediaType> getSupportedTypes(ParseContext context) {
return supportedTypes;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
TemporaryResources tmp = new TemporaryResources();
try {
TikaInputStream tis = TikaInputStream.get(stream, tmp);
parse(tis, handler, metadata, context);
} finally {
tmp.dispose();
}
}
private void parse(
TikaInputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
if ("telnet".equals(uri.getScheme())) {
final Socket socket = new Socket(uri.getHost(), uri.getPort());
try {
new ParsingTask(stream, new FilterOutputStream(socket.getOutputStream()) {
@Override
public void close() throws IOException {
socket.shutdownOutput();
}
}).parse(
socket.getInputStream(), handler, metadata, context);
} finally {
socket.close();
}
} else {
URL url = uri.toURL();
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
connection.connect();
InputStream input = connection.getInputStream();
try {
new ParsingTask(stream, connection.getOutputStream()).parse(
new CloseShieldInputStream(input),
handler, metadata, context);
} finally {
input.close();
}
}
}
private static class ParsingTask implements Runnable {
private final TikaInputStream input;
private final OutputStream output;
private volatile Exception exception = null;
public ParsingTask(TikaInputStream input, OutputStream output) {
this.input = input;
this.output = output;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
Thread thread = new Thread(this, "Tika network parser");
thread.start();
TaggedContentHandler tagged = new TaggedContentHandler(handler);
try {
context.getSAXParser().parse(
stream, new TeeContentHandler(
tagged, new MetaHandler(metadata)));
} catch (SAXException e) {
tagged.throwIfCauseOf(e);
throw new TikaException(
"Invalid network parser output", e);
} catch (IOException e) {
throw new TikaException(
"Unable to read network parser output", e);
} finally {
try {
thread.join(1000);
} catch (InterruptedException e) {
throw new TikaException("Network parser interrupted", e);
}
if (exception != null) {
input.throwIfCauseOf(exception);
throw new TikaException(
"Unexpected network parser error", exception);
}
}
}
//----------------------------------------------------------<Runnable>
public void run() {
try {
try {
IOUtils.copy(input, output);
} finally {
output.close();
}
} catch (Exception e) {
exception = e;
}
}
}
private static class MetaHandler extends DefaultHandler {
private final Metadata metadata;
public MetaHandler(Metadata metadata) {
this.metadata = metadata;
}
@Override
public void startElement(
String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if ("http://www.w3.org/1999/xhtml".equals(uri)
&& "meta".equals(localName)) {
String name = attributes.getValue("", "name");
String content = attributes.getValue("", "content");
if (name != null && content != null) {
metadata.add(name, content);
}
}
}
}
}