001/*
002 * (C) Copyright 2006-2009 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 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.web.common.ajax.service;
023
024import java.util.HashMap;
025import java.util.Map;
026import java.util.concurrent.locks.ReentrantReadWriteLock;
027import java.util.regex.Matcher;
028import java.util.regex.Pattern;
029
030import org.apache.commons.logging.Log;
031import org.apache.commons.logging.LogFactory;
032import org.nuxeo.ecm.platform.web.common.requestcontroller.service.LRUCachingMap;
033import org.nuxeo.runtime.model.ComponentInstance;
034import org.nuxeo.runtime.model.DefaultComponent;
035
036/**
037 * Simple Runtime component to manage proxyable url configuration via Extension Points
038 *
039 * @author tiry
040 */
041public class AjaxProxyComponent extends DefaultComponent implements AjaxProxyService {
042
043    public static final String PROXY_URL_EP = "proxyableURL";
044
045    protected static final Map<String, ProxyableURLDescriptor> urlDescriptors = new HashMap<String, ProxyableURLDescriptor>();
046
047    protected static final Map<String, ProxyURLConfigEntry> urlCache = new LRUCachingMap<String, ProxyURLConfigEntry>(
048            250);
049
050    protected static final ReentrantReadWriteLock cacheLock = new ReentrantReadWriteLock();
051
052    private static final Log log = LogFactory.getLog(AjaxProxyComponent.class);
053
054    @Override
055    public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
056        if (PROXY_URL_EP.equals(extensionPoint)) {
057            ProxyableURLDescriptor desc = (ProxyableURLDescriptor) contribution;
058            registerProxyURL(desc);
059        } else {
060            log.error("Unknown ExtensionPoint " + extensionPoint);
061        }
062    }
063
064    protected void registerProxyURL(ProxyableURLDescriptor desc) {
065        if (urlDescriptors.containsKey(desc.getName())) {
066            urlDescriptors.get(desc.getName()).merge(desc);
067        } else {
068            urlDescriptors.put(desc.getName(), desc);
069        }
070    }
071
072    public ProxyURLConfigEntry getConfigForURL(String targetUrl) {
073        ProxyURLConfigEntry entry = null;
074
075        try {
076            cacheLock.readLock().lock();
077            entry = urlCache.get(targetUrl);
078        } finally {
079            cacheLock.readLock().unlock();
080        }
081        if (entry == null) {
082            entry = computeConfigForURL(targetUrl);
083            try {
084                cacheLock.writeLock().lock();
085                urlCache.put(targetUrl, entry);
086            } finally {
087                cacheLock.writeLock().unlock();
088            }
089        }
090        return entry;
091    }
092
093    public ProxyURLConfigEntry computeConfigForURL(String targetUrl) {
094        for (ProxyableURLDescriptor desc : urlDescriptors.values()) {
095            if (desc.isEnabled()) {
096                Pattern pat = desc.getCompiledPattern();
097                Matcher m = pat.matcher(targetUrl);
098                if (m.matches()) {
099                    return new ProxyURLConfigEntry(true, desc);
100                }
101            }
102        }
103        // return deny by default
104        return new ProxyURLConfigEntry();
105    }
106
107}