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/**
* DSS - Digital Signature Services
* Copyright (C) 2015 European Commission, provided under the CEF programme
*
* This file is part of the "DSS - Digital Signature Services" project.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package eu.europa.esig.xmldsig;
import eu.europa.esig.dss.jaxb.XmlDefinerUtils;
import eu.europa.esig.dss.jaxb.exception.XSDValidationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.transform.Source;
import javax.xml.validation.Schema;
import javax.xml.validation.Validator;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Abstract class for XSD Utils
*/
public abstract class XSDAbstractUtils {
private static final Logger LOG = LoggerFactory.getLogger(XSDAbstractUtils.class);
/** Cached schema */
private Schema schema;
/**
* Returns a JAXBContext
*
* @return the created {@link JAXBContext}
* @throws JAXBException
* in case of an exception
*/
public abstract JAXBContext getJAXBContext() throws JAXBException;
/**
* Returns a list of module-specific XSD {@code Source}s
*
* @return list of XSD {@link Source}s
*/
public abstract List getXSDSources();
/**
* Returns a default module {@code Schema}. The result is cached
*
* @return the created {@link Schema}
* @throws SAXException
* in case of an exception
*/
public Schema getSchema() throws SAXException {
if (schema == null) {
schema = XmlDefinerUtils.getInstance().getSchema(getXSDSources());
}
return schema;
}
/**
* Returns a Schema with custom sources
*
* @param sources
* an array of custom {@link Source}s
* @return {@link Schema}
* @throws SAXException
* in case of an exception
*/
public Schema getSchema(Source... sources) throws SAXException {
List xsdSources = getXSDSources();
if (sources != null) {
xsdSources.addAll(Arrays.asList(sources));
}
return XmlDefinerUtils.getInstance().getSchema(xsdSources);
}
/**
* This method allows to validate an XML against the module-default XSD schema.
*
* @param xmlSource {@code Source} XML to validate
* @return empty list if the XSD validates the XML, error messages otherwise
*/
public List validateAgainstXSD(final Source xmlSource) {
try {
validate(xmlSource, getSchema(), true);
return Collections.emptyList();
} catch (XSDValidationException e) {
return e.getAllMessages();
} catch (Exception e) {
LOG.warn("An exception occurred : {}", e.getMessage(), e);
return Arrays.asList(e.getMessage());
}
}
/**
* This method allows to validate an XML against the module-default XSD schema
* plus custom sources.
*
* @param xmlSource {@code Source} XML to validate
* @param schemaSources {@code Source}s to validate against (custom schemas)
* @return empty list if the XSD validates the XML, error messages otherwise
*/
public List validateAgainstXSD(final Source xmlSource, Source... schemaSources) {
try {
validate(xmlSource, getSchema(schemaSources), true);
return Collections.emptyList();
} catch (XSDValidationException e) {
return e.getAllMessages();
} catch (Exception e) {
LOG.warn("An exception occurred : {}", e.getMessage(), e);
return Arrays.asList(e.getMessage());
}
}
/**
* This method allows to validate an XML against the module-default XSD schema plus custom sources.
*
* @param xmlSource
* the {@code Source}s to validate against (custom schemas)
* @param schema
* the used {@code Schema} to validate
* @param secureValidation
* enable/disable the secure validation (protection against XXE)
* @throws IOException if an exception occurs
*/
public void validate(final Source xmlSource, final Schema schema, boolean secureValidation)
throws IOException {
Validator validator = schema.newValidator();
try {
if (secureValidation) {
XmlDefinerUtils.getInstance().configure(validator);
}
validator.validate(xmlSource);
} catch (SAXException e) {
throw new XSDValidationException(Arrays.asList(e.getMessage()));
} finally {
XmlDefinerUtils.getInstance().postProcess(validator);
}
}
}
