/**
* Gets Xpath results
*
* @param contextNode
* @param xpathValue
* @return
* @throws XPathExpressionException
*/
private NodeList getXPathResults(Node contextNode, String xpathValue)
throws XPathExpressionException {
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
// see if the request root is in a namespace
String namespace = contextNode.getNamespaceURI();
// name spaces are used, so we need to lookup the correct
// prefix to use in the search string
NamedNodeMap namedNodeMap = contextNode.getAttributes();
Map<String, String> nsMap = new HashMap<String, String>();
for (int i = 0; i < namedNodeMap.getLength(); i++) {
Node n = namedNodeMap.item(i);
// we found the matching namespace, so get the prefix
// and then break out
String prefix = DOMHelper.getLocalName(n);
String nodeValue = n.getNodeValue();
nsMap.put(prefix, nodeValue);
}
// if there is not any namespace is defined for content element, default
// XACML request
// name space would be there.
if (XACMLConstants.REQUEST_CONTEXT_3_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_2_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_1_0_IDENTIFIER.equals(namespace)) {
nsMap.put("xacml", namespace);
}
NamespaceContext namespaceContext = new DefaultNamespaceContext(nsMap);
xpath.setNamespaceContext(namespaceContext);
XPathExpression expression = xpath.compile(xpathValue);
return (NodeList) expression.evaluate(contextNode, XPathConstants.NODESET);
}
@SuppressWarnings("unused")
@Override
public EvaluationResult findAttribute(
String contextPath,
URI attributeType,
String contextSelector,
Node root,
EvaluationCtx context,
String xpathVersion) {
Node contextNode = null;
NamespaceContext namespaceContext = null;
System.out.println(
"Context path ==> "
+ contextPath
+ " AttributeType ==> "
+ attributeType
+ " Context Selector ==> "
+ contextSelector
+ " Root Node name ==> "
+ root.getNodeName()
+ " root node type==> "
+ root.getNodeType()
+ " root node value==> "
+ root.getNodeValue()
+ " Context ==> "
+ context
+ " XPath version ==> "
+ xpathVersion);
if (root == null) {
System.out.println("Root node is null ");
// root == null means there is not content element defined with the
// attributes element
// therefore complete request is evaluated.
// get the DOM root of the request document
contextNode = context.getRequestRoot();
} else if (contextSelector != null) {
System.out.println("Content selector is not null ");
// root != null means content element is there. we can find the
// context node by
// evaluating the contextSelector
// 1st assume context node as the root
// TODO - Check if the contextNode should be assigned to root
contextNode = root;
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
// see if the request root is in a namespace
String namespace = null;
if (contextNode != null) {
namespace = contextNode.getNamespaceURI();
System.out.println(" nameSpace ==> " + contextNode);
}
// name spaces are used, so we need to lookup the correct
// prefix to use in the search string
NamedNodeMap namedNodeMap = contextNode.getAttributes();
Map<String, String> nsMap = new HashMap<String, String>();
for (int i = 0; i < namedNodeMap.getLength(); i++) {
Node n = namedNodeMap.item(i);
// we found the matching namespace, so get the prefix
// and then break out
String prefix = DOMHelper.getLocalName(n);
String nodeValue = n.getNodeValue();
System.out.println("nodeValue of nameaspace ==> " + nodeValue);
nsMap.put(prefix, nodeValue);
}
// if there is not any namespace is defined for content element,
// default XACML request
// name space would be there.
if (XACMLConstants.REQUEST_CONTEXT_3_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_2_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_1_0_IDENTIFIER.equals(namespace)) {
nsMap.put("xacml", namespace);
}
namespaceContext = new DefaultNamespaceContext(nsMap);
xpath.setNamespaceContext(namespaceContext);
try {
XPathExpression expression = xpath.compile(contextSelector);
NodeList result = (NodeList) expression.evaluate(contextNode, XPathConstants.NODESET);
if (result == null || result.getLength() == 0) {
throw new Exception("No node is found from context selector id evaluation");
} else if (result.getLength() != 1) {
throw new Exception("More than one node is found from context selector id evaluation");
}
contextNode = result.item(0);
} catch (Exception e) {
List<String> codes = new ArrayList<String>();
codes.add(Status.STATUS_SYNTAX_ERROR);
Status status = new Status(codes, e.getMessage());
return new EvaluationResult(status);
}
} else {
contextNode = root;
}
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
if (namespaceContext == null) {
// see if the request root is in a namespace
String namespace = null;
if (contextNode != null) {
namespace = contextNode.getNamespaceURI();
}
// name spaces are used, so we need to lookup the correct
// prefix to use in the search string
NamedNodeMap namedNodeMap = contextNode.getAttributes();
Map<String, String> nsMap = new HashMap<String, String>();
for (int i = 0; i < namedNodeMap.getLength(); i++) {
Node n = namedNodeMap.item(i);
// we found the matching namespace, so get the prefix
// and then break out
String prefix = DOMHelper.getLocalName(n);
String nodeValue = n.getNodeValue();
nsMap.put(prefix, nodeValue);
}
// if there is not any namespace is defined for content element,
// default XACML request
// name space would be there.
if (XACMLConstants.REQUEST_CONTEXT_3_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_2_0_IDENTIFIER.equals(namespace)
|| XACMLConstants.REQUEST_CONTEXT_1_0_IDENTIFIER.equals(namespace)) {
nsMap.put("xacml", namespace);
}
namespaceContext = new DefaultNamespaceContext(nsMap);
}
xpath.setNamespaceContext(namespaceContext);
NodeList matches;
try {
XPathExpression expression = xpath.compile(contextPath);
matches = (NodeList) expression.evaluate(contextNode, XPathConstants.NODESET);
if (matches == null || matches.getLength() < 1) {
throw new Exception("No node is found from xpath evaluation");
}
} catch (XPathExpressionException e) {
List<String> codes = new ArrayList<String>();
codes.add(Status.STATUS_SYNTAX_ERROR);
Status status = new Status(codes, e.getMessage());
return new EvaluationResult(status);
} catch (Exception e) {
List<String> codes = new ArrayList<String>();
codes.add(Status.STATUS_SYNTAX_ERROR);
Status status = new Status(codes, e.getMessage());
return new EvaluationResult(status);
}
if (matches.getLength() == 0) {
// we didn't find anything, so we return an empty bag
return new EvaluationResult(BagAttribute.createEmptyBag(attributeType));
}
// there was at least one match, so try to generate the values
try {
ArrayList<AttributeValue> list = new ArrayList<AttributeValue>();
AttributeFactory attrFactory = Balana.getInstance().getAttributeFactory();
for (int i = 0; i < matches.getLength(); i++) {
String text = null;
Node node = matches.item(i);
short nodeType = node.getNodeType();
// see if this is straight text, or a node with data under
// it and then get the values accordingly
if ((nodeType == Node.CDATA_SECTION_NODE)
|| (nodeType == Node.COMMENT_NODE)
|| (nodeType == Node.TEXT_NODE)
|| (nodeType == Node.ATTRIBUTE_NODE)) {
// there is no child to this node
text = node.getNodeValue();
} else {
// the data is in a child node
text = node.getFirstChild().getNodeValue();
}
list.add(attrFactory.createValue(attributeType, text));
}
return new EvaluationResult(new BagAttribute(attributeType, list));
} catch (ParsingException pe) {
ArrayList<String> code = new ArrayList<String>();
code.add(Status.STATUS_PROCESSING_ERROR);
return new EvaluationResult(new Status(code, pe.getMessage()));
} catch (UnknownIdentifierException uie) {
ArrayList<String> code = new ArrayList<String>();
code.add(Status.STATUS_PROCESSING_ERROR);
return new EvaluationResult(new Status(code, "Unknown attribute type : " + attributeType));
}
}