org.owasp.dependencycheck.data.lucene.UrlTokenizingFilter Maven / Gradle / Ivy
/*
* This file is part of dependency-check-core.
*
* Licensed 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.
*
* Copyright (c) 2013 Jeremy Long. All Rights Reserved.
*/
package org.owasp.dependencycheck.data.lucene;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayDeque;
import java.util.List;
import javax.annotation.concurrent.NotThreadSafe;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.owasp.dependencycheck.utils.UrlStringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* Takes a TokenStream, looks for URLs, and breaks them into separate tokens.
*
* @author Jeremy Long
*/
@NotThreadSafe
public final class UrlTokenizingFilter extends AbstractTokenizingFilter {
/**
* The logger.
*/
private static final Logger LOGGER = LoggerFactory.getLogger(UrlTokenizingFilter.class);
/**
* Constructs a new UrlTokenizingFilter.
*
* @param stream the TokenStream that this filter will process
*/
public UrlTokenizingFilter(TokenStream stream) {
super(stream);
}
/**
* Increments the underlying TokenStream and sets CharTermAttributes to
* construct an expanded set of tokens by concatenating tokens with the
* previous token.
*
* @return whether or not we have hit the end of the TokenStream
* @throws IOException is thrown when an IOException occurs
*/
@Override
@SuppressWarnings("StringSplitter")
public boolean incrementToken() throws IOException {
final ArrayDeque tokens = getTokens();
final CharTermAttribute termAtt = getTermAtt();
if (tokens.isEmpty() && input.incrementToken()) {
final String text = new String(termAtt.buffer(), 0, termAtt.length());
if (UrlStringUtils.containsUrl(text)) {
final String[] parts = text.split("\\s");
for (String part : parts) {
if (UrlStringUtils.isUrl(part)) {
try {
final List data = UrlStringUtils.extractImportantUrlData(part);
tokens.addAll(data);
} catch (MalformedURLException ex) {
LOGGER.debug("error parsing {}", part, ex);
tokens.add(part);
}
} else {
tokens.add(part);
}
}
} else {
tokens.add(text);
}
}
return addTerm();
}
}