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in intranets and the internet can now choose to appear as Googlebot. This is an essential necessity to be able to compete in the field of commercial search appliances, since most web pages are these days optimized only for Google and no other search platform any more. All commercial search engine providers have a built-in fake-Google User Agent to be able to get the same search index as Google can do. Without the resistance against obeying to robots.txt in this case, no competition is possible any more. YaCy will always obey the robots.txt when it is used for crawling the web in a peer-to-peer network, but to establish a Search Appliance (like a Google Search Appliance, GSA) it is necessary to be able to behave exactly like a Google crawler. With this change, you will be able to switch the user agent when portal or intranet mode is selected on per-crawl-start basis. Every crawl start can have a different user agent.
114 lines
4.1 KiB
Java
114 lines
4.1 KiB
Java
//SitemapImporter.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@yacy.net
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2007
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//
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//this file was contributed by Martin Thelian
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//last major change: $LastChangedDate$ by $LastChangedBy$
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//Revision: $LastChangedRevision$
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.crawler.retrieval;
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import java.net.MalformedURLException;
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import java.util.Date;
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import net.yacy.cora.document.ASCII;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.crawler.HarvestProcess;
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import net.yacy.crawler.data.CrawlProfile;
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import net.yacy.document.parser.sitemapParser;
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import net.yacy.document.parser.sitemapParser.URLEntry;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.data.meta.URIMetadataNode;
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import net.yacy.search.Switchboard;
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public class SitemapImporter extends Thread {
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private CrawlProfile crawlingProfile = null;
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private static final ConcurrentLog logger = new ConcurrentLog("SITEMAP");
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private DigestURI siteMapURL = null;
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private final Switchboard sb;
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public SitemapImporter(final Switchboard sb, final DigestURI sitemapURL, final CrawlProfile profileEntry) {
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assert sitemapURL != null;
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this.sb = sb;
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this.siteMapURL = sitemapURL;
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assert profileEntry != null;
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this.crawlingProfile = profileEntry;
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}
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@Override
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public void run() {
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try {
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logger.info("Start parsing sitemap file " + this.siteMapURL);
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sitemapParser.SitemapReader parser = sitemapParser.parse(this.siteMapURL, this.crawlingProfile.getAgent());
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parser.start();
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URLEntry item;
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while ((item = parser.take()) != sitemapParser.POISON_URLEntry) {
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process(item);
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}
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} catch (final Exception e) {
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logger.warn("Unable to parse sitemap file " + this.siteMapURL, e);
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}
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}
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public void process(sitemapParser.URLEntry entry) {
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// get the url hash
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byte[] nexturlhash = null;
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DigestURI url = null;
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try {
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url = new DigestURI(entry.url());
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nexturlhash = url.hash();
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} catch (final MalformedURLException e1) {
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}
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// check if the url is known and needs to be recrawled
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Date lastMod = entry.lastmod(null);
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if (lastMod != null) {
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@SuppressWarnings("deprecation")
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final HarvestProcess dbocc = this.sb.urlExists(ASCII.String(nexturlhash));
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if (dbocc != null && dbocc == HarvestProcess.LOADED) {
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// the url was already loaded. we need to check the date
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final URIMetadataNode oldEntry = this.sb.index.fulltext().getMetadata(nexturlhash);
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if (oldEntry != null) {
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final Date modDate = oldEntry.moddate();
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// check if modDate is null
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if (modDate.after(lastMod)) return;
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}
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}
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}
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// URL needs to crawled
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this.sb.crawlStacker.enqueueEntry(new Request(
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ASCII.getBytes(this.sb.peers.mySeed().hash),
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url,
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null, // this.siteMapURL.toString(),
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entry.url(),
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entry.lastmod(new Date()),
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this.crawlingProfile.handle(),
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0,
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0,
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0,
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0
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));
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logger.info("New URL '" + entry.url() + "' added for loading.");
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}
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}
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