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266 lines
9.8 KiB
266 lines
9.8 KiB
/**
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* sitemapParser.java
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* Copyright 2010 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 08.09.2010 at http://yacy.net
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*
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* $LastChangedDate$
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* $LastChangedRevision$
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* $LastChangedBy$
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document.parser;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.text.ParseException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.BlockingQueue;
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import java.util.zip.GZIPInputStream;
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import javax.xml.parsers.DocumentBuilderFactory;
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import net.yacy.cora.date.ISO8601Formatter;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.protocol.http.HTTPClient;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.TextParser;
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import net.yacy.document.VocabularyScraper;
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import net.yacy.kelondro.io.ByteCountInputStream;
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import org.w3c.dom.CharacterData;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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public class sitemapParser extends AbstractParser implements Parser {
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public sitemapParser() {
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super("sitemap Parser");
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// unfortunately sitemap files have neither a mime type nor a typical file extension.
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//SUPPORTED_EXTENSIONS.add("php");
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//SUPPORTED_EXTENSIONS.add("xml");
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}
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@Override
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public Document[] parse(
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final DigestURL location,
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final String mimeType,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final InputStream source)
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throws Failure, InterruptedException {
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final List<Document> docs = new ArrayList<Document>();
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SitemapReader sitemap = new SitemapReader(source, ClientIdentification.yacyInternetCrawlerAgent);
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sitemap.start();
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DigestURL uri;
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Document doc;
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URLEntry item;
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while ((item = sitemap.take()) != POISON_URLEntry) try {
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uri = new DigestURL(item.loc);
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doc = new Document(
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uri,
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TextParser.mimeOf(location),
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charset,
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this,
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null,
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null,
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singleList(""),
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null,
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"",
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null,
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null,
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0.0d, 0.0d,
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null,
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null,
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null,
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null,
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false,
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new Date());
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docs.add(doc);
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} catch (final MalformedURLException e) {
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continue;
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}
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Document[] da = new Document[docs.size()];
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docs.toArray(da);
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return da;
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}
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public static SitemapReader parse(final DigestURL sitemapURL, final ClientIdentification.Agent agent) throws IOException {
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// download document
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ConcurrentLog.info("SitemapReader", "loading sitemap from " + sitemapURL.toNormalform(true));
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final RequestHeader requestHeader = new RequestHeader();
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final HTTPClient client = new HTTPClient(agent);
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client.setHeader(requestHeader.entrySet());
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try {
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client.GET(sitemapURL.toNormalform(false), false);
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if (client.getStatusCode() != 200) {
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throw new IOException("Unable to download the sitemap file " + sitemapURL +
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"\nServer returned status: " + client.getHttpResponse().getStatusLine());
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}
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// get some metadata
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int statusCode = client.getHttpResponse().getStatusLine().getStatusCode();
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final ResponseHeader header = new ResponseHeader(statusCode, client.getHttpResponse().getAllHeaders());
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final String contentMimeType = header.mime();
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InputStream contentStream = client.getContentstream();
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if (contentMimeType != null && (contentMimeType.equals("application/x-gzip") || contentMimeType.equals("application/gzip"))) {
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contentStream = new GZIPInputStream(contentStream);
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}
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final ByteCountInputStream counterStream = new ByteCountInputStream(contentStream, null);
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return new SitemapReader(counterStream, agent);
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} catch (final IOException e) {
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throw e;
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}
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}
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/**
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* for schemas see:
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* http://www.sitemaps.org/schemas/sitemap/0.9
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* http://www.google.com/schemas/sitemap/0.84
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*/
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public static class SitemapReader extends Thread {
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private final InputStream source;
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private final BlockingQueue<URLEntry> queue;
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private final ClientIdentification.Agent agent;
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public SitemapReader(final InputStream source, final ClientIdentification.Agent agent) {
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super(SitemapReader.class.getSimpleName());
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this.source = source;
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this.queue = new ArrayBlockingQueue<URLEntry>(10000);
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this.agent = agent;
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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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org.w3c.dom.Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(this.source);
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NodeList sitemapNodes = doc.getElementsByTagName("sitemap");
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for (int i = 0; i < sitemapNodes.getLength(); i++) {
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String url = new SitemapEntry((Element) sitemapNodes.item(i)).url();
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if (url != null && url.length() > 0) {
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try {
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final SitemapReader r = parse(new DigestURL(url), agent);
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r.start();
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URLEntry item;
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while ((item = r.take()) != POISON_URLEntry) {
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try {
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this.queue.put(item);
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} catch (final InterruptedException e) {
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break;
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}
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}
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} catch (final IOException e) {}
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}
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}
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final NodeList urlEntryNodes = doc.getElementsByTagName("url");
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for (int i = 0; i < urlEntryNodes.getLength(); i++) {
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try {
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this.queue.put(new URLEntry((Element) urlEntryNodes.item(i)));
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} catch (final InterruptedException e) {
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break;
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}
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}
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} catch (final Throwable e) {
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ConcurrentLog.logException(e);
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}
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try {
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this.queue.put(POISON_URLEntry);
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} catch (final InterruptedException e) {
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}
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}
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/**
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* retrieve the next entry, waiting until one becomes available.
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* if no more are available, POISON_URLEntry is returned
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* @return the next entry from the sitemap or POISON_URLEntry if no more are there
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*/
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public URLEntry take() {
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try {
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return this.queue.take();
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} catch (final InterruptedException e) {
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return POISON_URLEntry;
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}
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}
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}
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public final static URLEntry POISON_URLEntry = new URLEntry(null);
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public static class URLEntry {
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public String loc, lastmod, changefreq, priority;
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public URLEntry(final Element element) {
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this.loc = val(element, "loc", "");
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this.lastmod = val(element, "lastmod", "");
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this.changefreq = val(element, "changefreq", "");
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this.priority = val(element, "priority", "");
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}
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public String url() {
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return this.loc;
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}
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public Date lastmod(final Date dflt) {
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try {
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return ISO8601Formatter.FORMATTER.parse(this.lastmod, 0).getTime();
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} catch (final ParseException e) {
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return dflt;
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}
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}
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}
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public static class SitemapEntry {
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public String loc, lastmod;
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public SitemapEntry(final Element element) {
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this.loc = val(element, "loc", "");
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this.lastmod = val(element, "lastmod", "");
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}
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public String url() {
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return this.loc;
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}
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public Date lastmod(final Date dflt) {
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try {
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return ISO8601Formatter.FORMATTER.parse(this.lastmod, 0).getTime();
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} catch (final ParseException e) {
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return dflt;
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}
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}
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}
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private static String val(final Element parent, final String label, final String dflt) {
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if (parent == null) return null;
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final Element e = (Element) parent.getElementsByTagName(label).item(0);
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if (e == null) return dflt;
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final Node child = e.getFirstChild();
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return (child instanceof CharacterData) ? ((CharacterData) child).getData() : dflt;
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}
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}
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