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• IgnoreDtdEntityResolver.java

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org.openfuxml.addon.wiki.util.IgnoreDtdEntityResolver Maven / Gradle / Ivy

package org.openfuxml.addon.wiki.util;

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

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * An entity resolver that resolves all requests for DTD content, thus preventing network access
 * when resolving DTDs.
 * 
 * Initial source copied from the Textile-J project
 *
 */
public class IgnoreDtdEntityResolver implements EntityResolver
{
	protected static final IgnoreDtdEntityResolver instance = new IgnoreDtdEntityResolver();
	
	public static IgnoreDtdEntityResolver getInstance()
	{
		return instance;
	}
	
	public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException
	{
		if ((publicId != null && publicId.indexOf("//DTD") != -1) || (systemId != null && systemId.endsWith(".dtd")))
		{
			return new InputSource(new StringReader(""));
		}
		return null;
	}
}