/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.subsystem.test;
import static org.junit.Assert.fail;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Properties;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import org.jboss.as.subsystem.test.xml.JBossEntityResolver;
import org.jboss.metadata.property.PropertiesPropertyResolver;
import org.jboss.metadata.property.PropertyReplacer;
import org.jboss.metadata.property.PropertyReplacers;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* XML Schema Validator.
*
* @author <a href="http://jmesnil.net/">Jeff Mesnil</a> (c) 2014 Red Hat inc.
*/
public class SchemaValidator {
private static ErrorHandler ERROR_HANDLER = new ErrorHandler() {
@Override
public void warning(SAXParseException exception) throws SAXException {
fail("warning: " + exception.getMessage());
}
@Override
public void error(SAXParseException exception) throws SAXException {
fail("error: " + exception.getMessage());
}
@Override
public void fatalError(SAXParseException exception) throws SAXException {
fail("fatal error: " + exception.getMessage());
}
};
/**
* Validate subtrees of the XML content against the XSD.
*
* Only subtrees starting from the given elementRoot will be validated against the schema.
*/
static void validateXML(String xmlContent, String elementRoot, String xsdPath, Properties resolvedProperties) throws Exception {
// build an input source from the XML content
InputSource inputSource = new InputSource(new StringReader(xmlContent));
Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputSource);
// validated only the nodes corresponding to the given elementRoot
NodeList nodes = document.getElementsByTagName(elementRoot);
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
// use a transformer to the the String result of the node tree
Transformer transformer = TransformerFactory.newInstance().newTransformer();
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(node), new StreamResult(writer));
SchemaValidator.validateXML(writer.toString(), xsdPath, resolvedProperties);
}
}
/**
* Validate the XML content against the XSD.
*
* The whole XML content must be valid.
*/
static void validateXML(String xmlContent, String xsdPath, Properties resolvedProperties) throws Exception {
String resolvedXml = resolveAllExpressions(xmlContent, resolvedProperties);
InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(xsdPath);
final Source source = new StreamSource(stream);
SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schemaFactory.setErrorHandler(ERROR_HANDLER);
schemaFactory.setResourceResolver(new JBossEntityResolver());
Schema schema = schemaFactory.newSchema(source);
javax.xml.validation.Validator validator = schema.newValidator();
validator.setErrorHandler(ERROR_HANDLER);
validator.setFeature("http://apache.org/xml/features/validation/schema", true);
validator.validate(new StreamSource(new StringReader(resolvedXml)));
}
/**
* Subsystem XML can contain expressions for simple XSD types (boolean, long, etc.) that
* prevents to validate it against the schema.
*
* For XML validation, the XML is read and any expression is resolved (they must have a default value to
* be properly resolved).
*/
private static String resolveAllExpressions(String xmlContent, Properties resolvedProperties) throws IOException {
PropertyReplacer replacer = PropertyReplacers.resolvingExpressionReplacer(new PropertiesPropertyResolver(resolvedProperties));
StringBuilder out = new StringBuilder();
try( BufferedReader reader = new BufferedReader(new StringReader(xmlContent)) ) {
String line;
while ((line = reader.readLine()) != null) {
out.append(replacer.replaceProperties(line));
out.append('\n');
}
}
return out.toString();
}
}