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409 lines
18 KiB
409 lines
18 KiB
//plasmaCrawlRobotsTxt.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, 2004
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//
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//This file is contributed by Martin Thelian
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// [MC] moved some methods from robotsParser file that had been created by Alexander Schier to this class
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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 de.anomic.crawler;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.regex.Pattern;
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import org.apache.log4j.Logger;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.protocol.HeaderFramework;
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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.kelondro.blob.BEncodedHeap;
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import net.yacy.kelondro.index.RowSpaceExceededException;
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import de.anomic.crawler.retrieval.HTTPLoader;
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public class RobotsTxt {
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private static Logger log = Logger.getLogger(RobotsTxt.class);
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public static final String ROBOTS_DB_PATH_SEPARATOR = ";";
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public static final Pattern ROBOTS_DB_PATH_SEPARATOR_MATCHER = Pattern.compile(ROBOTS_DB_PATH_SEPARATOR);
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BEncodedHeap robotsTable;
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private final ConcurrentHashMap<String, DomSync> syncObjects;
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//private static final HashSet<String> loadedRobots = new HashSet<String>(); // only for debugging
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private static class DomSync {
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public DomSync() {}
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}
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public RobotsTxt(final BEncodedHeap robotsTable) {
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this.robotsTable = robotsTable;
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syncObjects = new ConcurrentHashMap<String, DomSync>();
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log.info("initiated robots table: " + robotsTable.getFile());
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}
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public void clear() {
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log.info("clearing robots table");
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this.robotsTable.clear();
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syncObjects.clear();
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}
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public int size() {
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return this.robotsTable.size();
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}
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private RobotsEntry getEntry(final MultiProtocolURI theURL, final boolean fetchOnlineIfNotAvailableOrNotFresh) throws IOException {
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// this method will always return a non-null value
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String urlHostPort = getHostPort(theURL);
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RobotsEntry robotsTxt4Host = null;
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Map<String, byte[]> record;
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try {
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record = this.robotsTable.get(this.robotsTable.encodedKey(urlHostPort));
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} catch (RowSpaceExceededException e) {
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log.warn("memory exhausted", e);
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record = null;
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}
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if (record != null) robotsTxt4Host = new RobotsEntry(urlHostPort, record);
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if (fetchOnlineIfNotAvailableOrNotFresh && (
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robotsTxt4Host == null ||
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robotsTxt4Host.getLoadedDate() == null ||
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System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() > 7*24*60*60*1000
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)) {
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// make or get a synchronization object
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DomSync syncObj = this.syncObjects.get(urlHostPort);
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if (syncObj == null) {
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syncObj = new DomSync();
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this.syncObjects.put(urlHostPort, syncObj);
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}
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// we can now synchronize for each host separately
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synchronized (syncObj) {
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// if we have not found any data or the data is older than 7 days, we need to load it from the remote server
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// check the robots table again for all threads that come here because they waited for another one
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// to complete a download
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try {
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record = this.robotsTable.get(this.robotsTable.encodedKey(urlHostPort));
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} catch (RowSpaceExceededException e) {
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log.warn("memory exhausted", e);
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record = null;
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}
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if (record != null) robotsTxt4Host = new RobotsEntry(urlHostPort, record);
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if (robotsTxt4Host != null &&
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robotsTxt4Host.getLoadedDate() != null &&
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System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() <= 1*24*60*60*1000) {
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return robotsTxt4Host;
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}
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// generating the proper url to download the robots txt
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MultiProtocolURI robotsURL = null;
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try {
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robotsURL = new MultiProtocolURI("http://" + urlHostPort + "/robots.txt");
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} catch (final MalformedURLException e) {
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log.fatal("Unable to generate robots.txt URL for host:port '" + urlHostPort + "'.", e);
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robotsURL = null;
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}
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Object[] result = null;
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if (robotsURL != null) {
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if (log.isDebugEnabled()) log.debug("Trying to download the robots.txt file from URL '" + robotsURL + "'.");
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try {
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result = downloadRobotsTxt(robotsURL, 5, robotsTxt4Host);
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} catch (final Exception e) {
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result = null;
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}
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}
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/*
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assert !loadedRobots.contains(robotsURL.toNormalform(false, false)) :
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"robots-url=" + robotsURL.toString() +
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", robots=" + ((result == null || result[DOWNLOAD_ROBOTS_TXT] == null) ? "NULL" : new String((byte[]) result[DOWNLOAD_ROBOTS_TXT])) +
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", robotsTxt4Host=" + ((robotsTxt4Host == null) ? "NULL" : robotsTxt4Host.getLoadedDate().toString());
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loadedRobots.add(robotsURL.toNormalform(false, false));
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*/
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if (result == null) {
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// no robots.txt available, make an entry to prevent that the robots loading is done twice
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if (robotsTxt4Host == null) {
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// generate artificial entry
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robotsTxt4Host = new RobotsEntry(
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robotsURL,
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new ArrayList<String>(),
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new ArrayList<String>(),
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new Date(),
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new Date(),
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null,
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null,
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Integer.valueOf(0));
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} else {
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robotsTxt4Host.setLoadedDate(new Date());
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}
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// store the data into the robots DB
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int sz = this.robotsTable.size();
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addEntry(robotsTxt4Host);
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if (this.robotsTable.size() <= sz) {
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log.fatal("new entry in robots.txt table failed, resetting database");
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this.clear();
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addEntry(robotsTxt4Host);
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}
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} else {
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final robotsParser parserResult = new robotsParser((byte[]) result[DOWNLOAD_ROBOTS_TXT]);
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ArrayList<String> denyPath = parserResult.denyList();
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if (((Boolean) result[DOWNLOAD_ACCESS_RESTRICTED]).booleanValue()) {
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denyPath = new ArrayList<String>();
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denyPath.add("/");
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}
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// store the data into the robots DB
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robotsTxt4Host = addEntry(
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robotsURL,
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parserResult.allowList(),
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denyPath,
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new Date(),
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(Date) result[DOWNLOAD_MODDATE],
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(String) result[DOWNLOAD_ETAG],
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parserResult.sitemap(),
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parserResult.crawlDelayMillis());
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}
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}
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}
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return robotsTxt4Host;
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}
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private RobotsEntry addEntry(
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final MultiProtocolURI theURL,
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final ArrayList<String> allowPathList,
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final ArrayList<String> denyPathList,
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final Date loadedDate,
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final Date modDate,
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final String eTag,
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final String sitemap,
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final long crawlDelayMillis
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) {
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final RobotsEntry entry = new RobotsEntry(
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theURL, allowPathList, denyPathList,
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loadedDate, modDate,
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eTag, sitemap, crawlDelayMillis);
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addEntry(entry);
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return entry;
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}
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private String addEntry(final RobotsEntry entry) {
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// writes a new page and returns key
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try {
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this.robotsTable.insert(this.robotsTable.encodedKey(entry.hostName), entry.getMem());
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return entry.hostName;
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} catch (final Exception e) {
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log.warn("cannot write robots.txt entry", e);
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return null;
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}
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}
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// methods that had been in robotsParser.java:
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public static final int DOWNLOAD_ACCESS_RESTRICTED = 0;
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public static final int DOWNLOAD_ROBOTS_TXT = 1;
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public static final int DOWNLOAD_ETAG = 2;
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public static final int DOWNLOAD_MODDATE = 3;
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static final String getHostPort(final MultiProtocolURI theURL) {
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String urlHostPort = null;
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final int port = getPort(theURL);
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urlHostPort = theURL.getHost() + ":" + port;
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urlHostPort = urlHostPort.toLowerCase().intern();
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return urlHostPort;
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}
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private static final int getPort(final MultiProtocolURI theURL) {
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int port = theURL.getPort();
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if (port == -1) {
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if (theURL.getProtocol().equalsIgnoreCase("http")) {
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port = 80;
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} else if (theURL.getProtocol().equalsIgnoreCase("https")) {
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port = 443;
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}
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}
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return port;
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}
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public MultiProtocolURI getSitemapURL(final MultiProtocolURI theURL) {
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if (theURL == null) throw new IllegalArgumentException();
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if (!theURL.getProtocol().startsWith("http")) return null;
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MultiProtocolURI sitemapURL = null;
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// generating the hostname:poart string needed to do a DB lookup
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RobotsEntry robotsTxt4Host;
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try {
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robotsTxt4Host = this.getEntry(theURL, true);
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} catch (IOException e1) {
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return null;
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}
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try {
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final String sitemapUrlStr = robotsTxt4Host.getSitemap();
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if (sitemapUrlStr != null) sitemapURL = new MultiProtocolURI(sitemapUrlStr);
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} catch (final MalformedURLException e) {/* ignore this */}
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return sitemapURL;
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}
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public long getCrawlDelayMillis(final MultiProtocolURI theURL) {
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if (theURL == null) throw new IllegalArgumentException();
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if (!theURL.getProtocol().startsWith("http")) return 0;
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RobotsEntry robotsEntry;
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try {
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robotsEntry = getEntry(theURL, true);
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} catch (IOException e) {
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log.warn("cannot load robots.txt entry", e);
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return 0;
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}
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return robotsEntry.getCrawlDelayMillis();
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}
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public boolean isDisallowed(final MultiProtocolURI nexturl) {
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if (nexturl == null) throw new IllegalArgumentException();
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if (!nexturl.getProtocol().startsWith("http")) return false;
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// generating the hostname:port string needed to do a DB lookup
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RobotsEntry robotsTxt4Host = null;
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try {
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robotsTxt4Host = getEntry(nexturl, true);
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} catch (IOException e) {
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log.warn("cannot load robots.txt entry", e);
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return false;
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}
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return robotsTxt4Host.isDisallowed(nexturl.getFile());
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}
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private static Object[] downloadRobotsTxt(final MultiProtocolURI robotsURL, int redirectionCount, final RobotsEntry entry) throws Exception {
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if (robotsURL == null || !robotsURL.getProtocol().startsWith("http")) return null;
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if (redirectionCount < 0) return new Object[]{Boolean.FALSE,null,null};
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redirectionCount--;
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boolean accessCompletelyRestricted = false;
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byte[] robotsTxt = null;
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long downloadStart, downloadEnd;
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String eTag=null, oldEtag = null;
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Date lastMod=null;
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downloadStart = System.currentTimeMillis();
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// if we previously have downloaded this robots.txt then we can set the if-modified-since header
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RequestHeader reqHeaders = new RequestHeader();
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// add yacybot user agent
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reqHeaders.put(HeaderFramework.USER_AGENT, HTTPLoader.crawlerUserAgent);
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// adding referer
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reqHeaders.put(RequestHeader.REFERER, (MultiProtocolURI.newURL(robotsURL,"/")).toNormalform(true, true));
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if (entry != null) {
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oldEtag = entry.getETag();
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reqHeaders = new RequestHeader();
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final Date modDate = entry.getModDate();
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if (modDate != null) reqHeaders.put(RequestHeader.IF_MODIFIED_SINCE, HeaderFramework.formatRFC1123(entry.getModDate()));
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}
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// setup http-client
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//TODO: adding Traffic statistic for robots download?
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final HTTPClient client = new HTTPClient();
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client.setHeader(reqHeaders.entrySet());
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try {
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// check for interruption
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if (Thread.currentThread().isInterrupted()) throw new InterruptedException("Shutdown in progress.");
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// sending the get request
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robotsTxt = client.GETbytes(robotsURL.toString());
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final int code = client.getHttpResponse().getStatusLine().getStatusCode();
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final ResponseHeader header = new ResponseHeader(client.getHttpResponse().getAllHeaders());
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// check the response status
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if (code > 199 && code < 300) {
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if (!header.mime().startsWith("text/plain")) {
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robotsTxt = null;
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if (log.isDebugEnabled()) log.debug("Robots.txt from URL '" + robotsURL + "' has wrong mimetype '" + header.mime() + "'.");
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} else {
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// getting some metadata
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eTag = header.containsKey(HeaderFramework.ETAG)?(header.get(HeaderFramework.ETAG)).trim():null;
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lastMod = header.lastModified();
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// if the robots.txt file was not changed we break here
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if ((eTag != null) && (oldEtag != null) && (eTag.equals(oldEtag))) {
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if (log.isDebugEnabled()) log.debug("Robots.txt from URL '" + robotsURL + "' was not modified. Abort downloading of new version.");
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return null;
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}
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downloadEnd = System.currentTimeMillis();
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if (log.isDebugEnabled()) log.debug("Robots.txt successfully loaded from URL '" + robotsURL + "' in " + (downloadEnd-downloadStart) + " ms.");
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}
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} else if (code == 304) {
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return null;
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} else if (code > 299 && code < 400) {
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// getting redirection URL
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String redirectionUrlString = header.get(HeaderFramework.LOCATION);
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if (redirectionUrlString==null) {
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if (log.isDebugEnabled())
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log.debug("robots.txt could not be downloaded from URL '" + robotsURL + "' because of missing redirecton header. [" + client.getHttpResponse().getStatusLine() + "].");
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robotsTxt = null;
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} else {
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redirectionUrlString = redirectionUrlString.trim();
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// generating the new URL object
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final MultiProtocolURI redirectionUrl = MultiProtocolURI.newURL(robotsURL, redirectionUrlString);
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// following the redirection
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if (log.isDebugEnabled()) log.debug("Redirection detected for robots.txt with URL '" + robotsURL + "'." +
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"\nRedirecting request to: " + redirectionUrl);
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return downloadRobotsTxt(redirectionUrl,redirectionCount,entry);
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}
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} else if (code == 401 || code == 403) {
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accessCompletelyRestricted = true;
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if (log.isDebugEnabled()) log.debug("Access to Robots.txt not allowed on URL '" + robotsURL + "'.");
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} else {
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if (log.isDebugEnabled())
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log.debug("robots.txt could not be downloaded from URL '" + robotsURL + "'. [" + client.getHttpResponse().getStatusLine() + "].");
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robotsTxt = null;
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}
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} catch (final Exception e) {
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throw e;
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}
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return new Object[]{Boolean.valueOf(accessCompletelyRestricted),robotsTxt,eTag,lastMod};
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}
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}
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