001/*
002 * (C) Copyright 2010 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Arnaud Kervern
016 */
017
018package org.nuxeo.ecm.platform.shibboleth.computedgroups;
019
020import javax.el.ELException;
021import javax.el.PropertyNotFoundException;
022
023import org.apache.commons.logging.Log;
024import org.apache.commons.logging.LogFactory;
025import org.jboss.el.ExpressionFactoryImpl;
026import org.nuxeo.ecm.core.api.DocumentModel;
027import org.nuxeo.ecm.core.api.impl.DocumentModelImpl;
028import org.nuxeo.ecm.platform.el.ExpressionContext;
029import org.nuxeo.ecm.platform.el.ExpressionEvaluator;
030import org.nuxeo.ecm.platform.shibboleth.ShibbolethConstants;
031
032/**
033 * Helper to provide an easy way to execute the expression language defined in a Shibb Group doc
034 *
035 * @author Arnaud Kervern
036 */
037public class ELGroupComputerHelper {
038
039    private static final Log log = LogFactory.getLog(ELGroupComputerHelper.class);
040
041    protected static final ExpressionContext ec = new ExpressionContext();
042
043    protected static final ExpressionEvaluator ee = new ExpressionEvaluator(new ExpressionFactoryImpl());
044
045    public static boolean isUserInGroup(DocumentModel user, String el) {
046        if (el == null || el.equals("")) {
047            return false;
048        }
049
050        ee.bindValue(ec, ShibbolethConstants.EL_CURRENT_USER_NAME, user);
051        return ee.evaluateExpression(ec, "${" + el + "}", Boolean.class);
052    }
053
054    public static boolean isValidEL(String el) {
055        if (el == null || el.equals("")) {
056            return false;
057        }
058
059        try {
060            ee.bindValue(ec, ShibbolethConstants.EL_CURRENT_USER_NAME, new DocumentModelImpl("user"));
061            ee.evaluateExpression(ec, "${" + el + "}", Boolean.class);
062        } catch (PropertyNotFoundException e) {
063            return false;
064        } catch (ELException e) {
065            log.error(e, e);
066            return false;
067        }
068        return true;
069    }
070}