com.day.jcr.vault.util.RejectingEntityDefaultHandler Maven / Gradle / Ivy

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package com.day.jcr.vault.util;

import java.io.IOException;
import java.io.StringReader;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

/**
 * Default handler with special entity resolver that handles all entity resolution requests by returning an empty input
 * source. This is to prevent "Arbitrary DTD inclusion in XML parsing".
 */
public class RejectingEntityDefaultHandler extends DefaultHandler {

    /**
     * default logger
     */
    private static final Logger log = LoggerFactory.getLogger(RejectingEntityDefaultHandler.class);

    @Override
    public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException {
        log.warn("Rejecting external entity loading with publicId={} systemId={}", publicId, systemId);
        return new InputSource(new StringReader(""));
    }
}