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DSS Service Provider Interface contains the contract interface shared between the applet and the server-side of DSS.
package eu.europa.esig.dss;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.XMLConstants;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import eu.europa.esig.dss.utils.Utils;
public final class DomUtils {
private static final Logger LOG = LoggerFactory.getLogger(DomUtils.class);
private DomUtils() {
}
private static DocumentBuilderFactory dbFactory;
private static final XPathFactory factory = XPathFactory.newInstance();
private static NamespaceContextMap namespacePrefixMapper;
private static final Map namespaces;
static {
namespacePrefixMapper = new NamespaceContextMap();
namespaces = new HashMap();
registerDefaultNamespaces();
}
/**
* This method registers the default namespaces.
*/
private static void registerDefaultNamespaces() {
registerNamespace("ds", XMLSignature.XMLNS);
registerNamespace("dsig", XMLSignature.XMLNS);
registerNamespace("xades", XAdESNamespaces.XAdES); // 1.3.2
registerNamespace("xades141", XAdESNamespaces.XAdES141);
registerNamespace("xades122", XAdESNamespaces.XAdES122);
registerNamespace("xades111", XAdESNamespaces.XAdES111);
}
/**
* This method allows to register a namespace and associated prefix. If the prefix exists already it is replaced.
*
* @param prefix
* namespace prefix
* @param namespace
* namespace
* @return true if this map did not already contain the specified element
*/
public static boolean registerNamespace(final String prefix, final String namespace) {
final String put = namespaces.put(prefix, namespace);
namespacePrefixMapper.registerNamespace(prefix, namespace);
return put == null;
}
/**
* Guarantees that the xmlString builder has been created.
*
* @throws DSSException
*/
private static void ensureDocumentBuilder() throws DSSException {
if (dbFactory != null) {
return;
}
dbFactory = DocumentBuilderFactory.newInstance();
dbFactory.setNamespaceAware(true);
try {
// disable external entities
dbFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
dbFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
dbFactory.setXIncludeAware(false);
dbFactory.setExpandEntityReferences(false);
} catch (ParserConfigurationException e) {
throw new DSSException(e);
}
}
public static TransformerFactory getSecureTransformerFactory() {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
try {
transformerFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
} catch (TransformerConfigurationException e) {
throw new DSSException(e);
}
transformerFactory.setErrorListener(new DSSXmlErrorListener());
return transformerFactory;
}
public static Transformer getSecureTransformer() {
TransformerFactory transformerFactory = getSecureTransformerFactory();
Transformer transformer = null;
try {
transformer = transformerFactory.newTransformer();
} catch (TransformerConfigurationException e) {
throw new DSSException(e);
}
transformer.setErrorListener(new DSSXmlErrorListener());
return transformer;
}
/**
* Creates the new empty Document.
*
* @return
* @throws DSSException
*/
public static Document buildDOM() {
ensureDocumentBuilder();
try {
return dbFactory.newDocumentBuilder().newDocument();
} catch (ParserConfigurationException e) {
throw new DSSException(e);
}
}
/**
* This method returns the {@link org.w3c.dom.Document} created based on the XML string.
*
* @param xmlString
* The string representing the dssDocument to be created.
* @return
* @throws DSSException
*/
public static Document buildDOM(final String xmlString) throws DSSException {
return buildDOM(DSSUtils.getUtf8Bytes(xmlString));
}
/**
* This method returns the {@link org.w3c.dom.Document} created based on byte array.
*
* @param bytes
* The bytes array representing the dssDocument to be created.
* @return
* @throws DSSException
*/
public static Document buildDOM(final byte[] bytes) throws DSSException {
return buildDOM(new ByteArrayInputStream(bytes));
}
/**
* This method returns the {@link org.w3c.dom.Document} created based on the {@link eu.europa.esig.dss.DSSDocument}.
*
* @param dssDocument
* The DSS representation of the document from which the dssDocument is created.
* @return
* @throws DSSException
*/
public static Document buildDOM(final DSSDocument dssDocument) throws DSSException {
return buildDOM(dssDocument.openStream());
}
/**
* This method returns the {@link org.w3c.dom.Document} created based on the XML inputStream.
*
* @param inputStream
* The inputStream stream representing the dssDocument to be created.
* @return
* @throws DSSException
*/
public static Document buildDOM(final InputStream inputStream) throws DSSException {
try {
ensureDocumentBuilder();
final Document rootElement = dbFactory.newDocumentBuilder().parse(inputStream);
return rootElement;
} catch (Exception e) {
throw new DSSException(e);
} finally {
Utils.closeQuietly(inputStream);
}
}
/**
* Creates a DOM document without document element.
*
* @param namespaceURI
* the namespace URI of the document element to create or null
* @param qualifiedName
* the qualified name of the document element to be created or null
* @return {@code Document}
*/
public static Document createDocument(final String namespaceURI, final String qualifiedName) {
ensureDocumentBuilder();
DOMImplementation domImpl;
try {
domImpl = dbFactory.newDocumentBuilder().getDOMImplementation();
} catch (ParserConfigurationException e) {
throw new DSSException(e);
}
return domImpl.createDocument(namespaceURI, qualifiedName, null);
}
/**
* This method creates and adds a new XML {@code Element}
*
* @param document
* root document
* @param parentDom
* parent node
* @param namespace
* namespace
* @param name
* element name
* @return added element
*/
public static Element addElement(final Document document, final Element parentDom, final String namespace, final String name) {
final Element dom = document.createElementNS(namespace, name);
parentDom.appendChild(dom);
return dom;
}
/**
* @param xpathString
* XPath query string
* @return
*/
private static XPathExpression createXPathExpression(final String xpathString) {
final XPath xpath = factory.newXPath();
xpath.setNamespaceContext(namespacePrefixMapper);
try {
final XPathExpression expr = xpath.compile(xpathString);
return expr;
} catch (XPathExpressionException ex) {
throw new DSSException(ex);
}
}
/**
* Returns the String value of the corresponding to the XPath query.
*
* @param xmlNode
* The node where the search should be performed.
* @param xPathString
* XPath query string
* @return string value of the XPath query
* @throws XPathExpressionException
*/
public static String getValue(final Node xmlNode, final String xPathString) {
try {
final XPathExpression xPathExpression = createXPathExpression(xPathString);
final String string = (String) xPathExpression.evaluate(xmlNode, XPathConstants.STRING);
return string.trim();
} catch (XPathExpressionException e) {
throw new DSSException(e);
}
}
/**
* Returns the NodeList corresponding to the XPath query.
*
* @param xmlNode
* The node where the search should be performed.
* @param xPathString
* XPath query string
* @return
* @throws XPathExpressionException
*/
public static NodeList getNodeList(final Node xmlNode, final String xPathString) {
try {
final XPathExpression expr = createXPathExpression(xPathString);
final NodeList evaluated = (NodeList) expr.evaluate(xmlNode, XPathConstants.NODESET);
return evaluated;
} catch (XPathExpressionException e) {
throw new DSSException(e);
}
}
/**
* Return the Node corresponding to the XPath query.
*
* @param xmlNode
* The node where the search should be performed.
* @param xPathString
* XPath query string
* @return
*/
public static Node getNode(final Node xmlNode, final String xPathString) {
final NodeList list = getNodeList(xmlNode, xPathString);
if (list.getLength() > 1) {
throw new DSSException("More than one result for XPath: " + xPathString);
}
return list.item(0);
}
/**
* Return the Element corresponding to the XPath query.
*
* @param xmlNode
* The node where the search should be performed.
* @param xPathString
* XPath query string
* @return
*/
public static Element getElement(final Node xmlNode, final String xPathString) {
return (Element) getNode(xmlNode, xPathString);
}
/**
* Returns true if the xpath query contains something
*
* @param xmlNode
* @param xPathString
* @return
*/
public static boolean isNotEmpty(final Node xmlNode, final String xPathString) {
// xpath suffix allows to skip text nodes and empty lines
NodeList nodeList = getNodeList(xmlNode, xPathString + "/child::node()[not(self::text())]");
if ((nodeList != null) && (nodeList.getLength() > 0)) {
return true;
}
return false;
}
/**
* This method creates and adds a new XML {@code Element} with text value
*
* @param document
* root document
* @param parentDom
* parent node
* @param namespace
* namespace
* @param name
* element name
* @param value
* element text node value
* @return added element
*/
public static Element addTextElement(final Document document, final Element parentDom, final String namespace, final String name, final String value) {
final Element dom = document.createElementNS(namespace, name);
parentDom.appendChild(dom);
final Text valueNode = document.createTextNode(value);
dom.appendChild(valueNode);
return dom;
}
/**
* This method sets a text node to the given DOM element.
*
* @param document
* root document
* @param parentDom
* parent node
* @param text
* text to be added
*/
public static void setTextNode(final Document document, final Element parentDom, final String text) {
final Text textNode = document.createTextNode(text);
parentDom.appendChild(textNode);
}
/**
* Converts a given {@code Date} to a new {@code XMLGregorianCalendar}.
*
* @param date
* the date to be converted
* @return the new {@code XMLGregorianCalendar} or null
*/
public static XMLGregorianCalendar createXMLGregorianCalendar(final Date date) {
if (date == null) {
return null;
}
final GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);
try {
XMLGregorianCalendar xmlGregorianCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(calendar);
xmlGregorianCalendar.setFractionalSecond(null);
xmlGregorianCalendar = xmlGregorianCalendar.normalize(); // to UTC = Zulu
return xmlGregorianCalendar;
} catch (DatatypeConfigurationException e) {
LOG.warn("Unable to properly convert a Date to an XMLGregorianCalendar " + e.getMessage(), e);
}
return null;
}
/**
* This method allows to convert the given text (XML representation of a date) to the {@code Date}.
*
* @param text
* the text representing the XML date
* @return {@code Date} converted or null
*/
public static Date getDate(final String text) {
try {
final DatatypeFactory datatypeFactory = DatatypeFactory.newInstance();
final XMLGregorianCalendar xmlGregorianCalendar = datatypeFactory.newXMLGregorianCalendar(text);
return xmlGregorianCalendar.toGregorianCalendar().getTime();
} catch (DatatypeConfigurationException e) {
LOG.warn("Unable to parse '{}'", text);
}
return null;
}
/**
* This method returns the list of children's names for a given {@code Node}.
*
* @param xmlNode
* The node where the search should be performed.
* @param xPathString
* XPath query string
* @return {@code List} of children's names
*/
public static List getChildrenNames(final Node xmlNode, final String xPathString) {
List childrenNames = new ArrayList();
final Element element = getElement(xmlNode, xPathString);
if (element != null) {
final NodeList unsignedProperties = element.getChildNodes();
for (int ii = 0; ii < unsignedProperties.getLength(); ++ii) {
final Node node = unsignedProperties.item(ii);
childrenNames.add(node.getLocalName());
}
}
return childrenNames;
}
public static void writeDocumentTo(final Document dom, final OutputStream os) throws DSSException {
try {
final DOMSource xmlSource = new DOMSource(dom);
final StreamResult outputTarget = new StreamResult(os);
Transformer transformer = getSecureTransformer();
transformer.transform(xmlSource, outputTarget);
} catch (Exception e) {
throw new DSSException(e);
}
}
/**
* This method allows to convert an XML {@code Node} to a {@code String}.
*
* @param node
* {@code Node} to be converted
* @return {@code String} representation of the node
*/
public static String xmlToString(final Node node) {
try {
final Source source = new DOMSource(node);
final StringWriter stringWriter = new StringWriter();
final Result result = new StreamResult(stringWriter);
final Transformer transformer = getSecureTransformer();
transformer.transform(source, result);
return stringWriter.getBuffer().toString();
} catch (Exception e) {
throw new DSSException(e);
}
}
}
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