br.com.esec.icpm.libs.signature.helper.attach.XadesAttachSignatureHelper Maven / Gradle / Ivy

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This library is used to make integration with Certillion server, so our Clients can easily ask for signatures or generate certificates.

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package br.com.esec.icpm.libs.signature.helper.attach;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

public class XadesAttachSignatureHelper {

	private static Logger log = LoggerFactory.getLogger(XadesAttachSignatureHelper.class);

	private static DocumentBuilder docBuilder;
	private static Transformer transformer;

	static {
		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		try {
			docBuilder = docFactory.newDocumentBuilder();
		} catch (ParserConfigurationException e) {
			throw new IllegalStateException("Can not mount docBuilder.", e);
		}

		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		try {
			transformer = transformerFactory.newTransformer();
			transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
		} catch (TransformerConfigurationException e) {
			throw new IllegalStateException("Can not mount transformer.", e);
		}
	}

	public static void attach(long transactionId, InputStream originalXml, InputStream signature, OutputStream signedXml) {

		try {
			log.info("[TRANSACTION " + transactionId + "] " + "Attaching signature on XML... ");

			Document originalDoc = docBuilder.parse(originalXml);
			Document signatureTagDoc = docBuilder.parse(signature);

			// faz o attach de verdade
			Node child = originalDoc.getFirstChild();
			Node newTag = signatureTagDoc.getFirstChild().cloneNode(true);
			originalDoc.adoptNode(newTag);
			child.appendChild(newTag);

			encodeXml(originalDoc, signedXml);

			log.info("[TRANSACTION " + transactionId + "] " + "XML attached.");
		} catch (IOException e) {
			throw new IllegalStateException(e);
		} catch (SAXException e) {
			throw new IllegalStateException(e);
		} catch (TransformerException e) {
			throw new IllegalStateException(e);
		}
	}

	private static void encodeXml(Node rootTag, OutputStream out) throws TransformerException {
		DOMSource source = new DOMSource(rootTag);
		StreamResult result = new StreamResult(out);
		transformer.transform(source, result);
	}
}