/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.cxf.ws.security.wss4j.policyvalidators;
import java.util.Collection;
import java.util.Map;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.helpers.MapNamespaceContext;
import org.apache.cxf.ws.policy.AssertionInfo;
import org.apache.wss4j.policy.SP11Constants;
import org.apache.wss4j.policy.SP12Constants;
import org.apache.wss4j.policy.model.RequiredElements;
/**
* Validate a RequiredElements policy
*/
public class RequiredElementsPolicyValidator implements SecurityPolicyValidator {
/**
* Return true if this SecurityPolicyValidator implementation is capable of validating a
* policy defined by the AssertionInfo parameter
*/
public boolean canValidatePolicy(AssertionInfo assertionInfo) {
return assertionInfo.getAssertion() != null
&& (SP12Constants.REQUIRED_ELEMENTS.equals(assertionInfo.getAssertion().getName())
|| SP11Constants.REQUIRED_ELEMENTS.equals(assertionInfo.getAssertion().getName()));
}
/**
* Validate policies.
*/
public void validatePolicies(PolicyValidatorParameters parameters, Collection<AssertionInfo> ais) {
for (AssertionInfo ai : ais) {
RequiredElements rp = (RequiredElements)ai.getAssertion();
ai.setAsserted(true);
if (rp != null && rp.getXPaths() != null && !rp.getXPaths().isEmpty()) {
XPathFactory factory = XPathFactory.newInstance();
for (org.apache.wss4j.policy.model.XPath xPath : rp.getXPaths()) {
Map<String, String> namespaces = xPath.getPrefixNamespaceMap();
String expression = xPath.getXPath();
XPath xpath = factory.newXPath();
if (namespaces != null) {
xpath.setNamespaceContext(new MapNamespaceContext(namespaces));
}
NodeList list;
Element header = parameters.getSoapHeader();
header = (Element)DOMUtils.getDomElement(header);
try {
list = (NodeList)xpath.evaluate(expression,
header,
XPathConstants.NODESET);
if (list.getLength() == 0) {
ai.setNotAsserted("No header element matching XPath " + expression + " found.");
}
} catch (XPathExpressionException e) {
ai.setNotAsserted("Invalid XPath expression " + expression + " " + e.getMessage());
}
}
}
}
}
}