001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portlet.rss.util;
016    
017    import com.liferay.portal.kernel.util.HttpUtil;
018    import com.liferay.portal.kernel.util.Time;
019    import com.liferay.portal.kernel.webcache.WebCacheException;
020    import com.liferay.portal.kernel.webcache.WebCacheItem;
021    import com.liferay.portal.security.lang.DoPrivilegedBean;
022    import com.liferay.portal.util.HttpImpl;
023    import com.liferay.portal.util.PropsValues;
024    
025    import com.sun.syndication.feed.synd.SyndFeed;
026    import com.sun.syndication.io.SyndFeedInput;
027    import com.sun.syndication.io.XmlReader;
028    
029    import org.apache.commons.httpclient.HostConfiguration;
030    import org.apache.commons.httpclient.HttpClient;
031    import org.apache.commons.httpclient.methods.GetMethod;
032    import org.apache.commons.httpclient.params.HttpClientParams;
033    
034    /**
035     * @author Brian Wing Shun Chan
036     */
037    public class RSSWebCacheItem implements WebCacheItem {
038    
039            public RSSWebCacheItem(String url) {
040                    _url = url;
041            }
042    
043            public Object convert(String key) throws WebCacheException {
044                    SyndFeed feed = null;
045    
046                    try {
047    
048                            // com.liferay.portal.kernel.util.HttpUtil will break the connection
049                            // if it spends more than 5 seconds looking up a location. However,
050                            // German umlauts do not get encoded correctly. This may be a bug
051                            // with commons-httpclient or with how FeedParser uses
052                            // java.io.Reader.
053    
054                            // Use http://xml.newsisfree.com/feeds/29/629.xml and
055                            // http://test.domosoft.com/up/RSS to test if German umlauts show up
056                            // correctly.
057    
058                            /*Reader reader = new StringReader(
059                                    new String(HttpUtil.URLtoByteArray(_url)));
060    
061                            channel = FeedParser.parse(builder, reader);*/
062    
063                            HttpImpl httpImpl = null;
064    
065                            Object httpObject = HttpUtil.getHttp();
066    
067                            if (httpObject instanceof DoPrivilegedBean) {
068                                    DoPrivilegedBean doPrivilegedBean =
069                                            (DoPrivilegedBean)httpObject;
070    
071                                    httpImpl = (HttpImpl)doPrivilegedBean.getActualBean();
072                            }
073                            else {
074                                    httpImpl = (HttpImpl)httpObject;
075                            }
076    
077                            HostConfiguration hostConfiguration = httpImpl.getHostConfiguration(
078                                    _url);
079    
080                            HttpClient httpClient = httpImpl.getClient(hostConfiguration);
081    
082                            httpImpl.proxifyState(httpClient.getState(), hostConfiguration);
083    
084                            HttpClientParams httpClientParams = httpClient.getParams();
085    
086                            httpClientParams.setConnectionManagerTimeout(
087                                    PropsValues.RSS_CONNECTION_TIMEOUT);
088                            httpClientParams.setSoTimeout(PropsValues.RSS_CONNECTION_TIMEOUT);
089    
090                            GetMethod getMethod = new GetMethod(_url);
091    
092                            httpClient.executeMethod(hostConfiguration, getMethod);
093    
094                            SyndFeedInput input = new SyndFeedInput();
095    
096                            feed = input.build(
097                                    new XmlReader(getMethod.getResponseBodyAsStream()));
098                    }
099                    catch (Exception e) {
100                            throw new WebCacheException(_url + " " + e.toString());
101                    }
102    
103                    return feed;
104            }
105    
106            public long getRefreshTime() {
107                    return _REFRESH_TIME;
108            }
109    
110            private static final long _REFRESH_TIME = Time.MINUTE * 20;
111    
112            private String _url;
113    
114    }