001/**
002 * Copyright 2005-2017 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.kew.mail;
017
018import org.kuali.rice.core.api.mail.EmailContent;
019import org.kuali.rice.core.api.util.xml.XmlJotter;
020import org.kuali.rice.kew.api.WorkflowRuntimeException;
021import org.w3c.dom.Document;
022import org.w3c.dom.Node;
023
024import javax.xml.transform.Templates;
025import javax.xml.transform.TransformerException;
026import javax.xml.transform.dom.DOMResult;
027import javax.xml.transform.dom.DOMSource;
028import javax.xml.xpath.XPath;
029import javax.xml.xpath.XPathConstants;
030import javax.xml.xpath.XPathExpressionException;
031import javax.xml.xpath.XPathFactory;
032
033
034/**
035 * A class which has some convenience methods for handling Emails and stylesheets. 
036 * 
037 * @author Kuali Rice Team (rice.collab@kuali.org)
038 *
039 */
040public class EmailStyleHelper {
041
042    private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(EmailStyleHelper.class);
043    
044    public EmailContent generateEmailContent(Templates style, Document document) {
045        DOMResult result = new DOMResult();
046        if (LOG.isDebugEnabled()) {
047            LOG.debug("Input document: " + XmlJotter.jotNode(document.getDocumentElement(), true));
048        }
049        try {
050            style.newTransformer().transform(new DOMSource(document), result);
051        } catch (TransformerException te) {
052            String message = "Error transforming immediate reminder DOM";
053            LOG.error(message, te);
054            throw new WorkflowRuntimeException(message, te);
055        }
056
057        Node node = result.getNode();
058
059        if (LOG.isDebugEnabled()) {
060            LOG.debug("Email to be sent: " + XmlJotter.jotNode(node));
061        }
062        XPathFactory xpf = XPathFactory.newInstance();
063        XPath xpath = xpf.newXPath();
064        try {
065            String subject = (String) xpath.evaluate("/email/subject", node, XPathConstants.STRING);
066            String body = (String) xpath.evaluate("/email/body", node, XPathConstants.STRING);
067            // simple heuristic to determine whether content is HTML
068            return new EmailContent(subject, body, body.matches("(?msi).*<(\\w+:)?html.*"));
069        } catch (XPathExpressionException xpee) {
070            throw new WorkflowRuntimeException("Error evaluating generated email content", xpee);
071        }
072    }
073
074}