001/*
002 * (C) Copyright 2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
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 *
016 * Contributors:
017 *     Arnaud Kervern
018 */
019
020package org.nuxeo.ecm.platform.shibboleth.computedgroups;
021
022import javax.el.ELException;
023import javax.el.PropertyNotFoundException;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.jboss.el.ExpressionFactoryImpl;
028import org.nuxeo.ecm.core.api.DocumentModel;
029import org.nuxeo.ecm.core.api.impl.DocumentModelImpl;
030import org.nuxeo.ecm.platform.el.ExpressionContext;
031import org.nuxeo.ecm.platform.el.ExpressionEvaluator;
032import org.nuxeo.ecm.platform.shibboleth.ShibbolethConstants;
033
034/**
035 * Helper to provide an easy way to execute the expression language defined in a Shibb Group doc
036 *
037 * @author Arnaud Kervern
038 */
039public class ELGroupComputerHelper {
040
041    private static final Log log = LogFactory.getLog(ELGroupComputerHelper.class);
042
043    protected static final ExpressionContext ec = new ExpressionContext();
044
045    protected static final ExpressionEvaluator ee = new ExpressionEvaluator(new ExpressionFactoryImpl());
046
047    public static boolean isUserInGroup(DocumentModel user, String el) {
048        if (el == null || el.equals("")) {
049            return false;
050        }
051
052        ee.bindValue(ec, ShibbolethConstants.EL_CURRENT_USER_NAME, user);
053        return ee.evaluateExpression(ec, "${" + el + "}", Boolean.class);
054    }
055
056    public static boolean isValidEL(String el) {
057        if (el == null || el.equals("")) {
058            return false;
059        }
060
061        try {
062            ee.bindValue(ec, ShibbolethConstants.EL_CURRENT_USER_NAME, new DocumentModelImpl("user"));
063            ee.evaluateExpression(ec, "${" + el + "}", Boolean.class);
064        } catch (PropertyNotFoundException e) {
065            return false;
066        } catch (ELException e) {
067            log.error(e, e);
068            return false;
069        }
070        return true;
071    }
072}