You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
412 lines
18 KiB
412 lines
18 KiB
//plasmaCrawlRobotsTxt.java
|
|
//-------------------------------------
|
|
//part of YACY
|
|
//(C) by Michael Peter Christen; mc@yacy.net
|
|
//first published on http://www.anomic.de
|
|
//Frankfurt, Germany, 2004
|
|
//
|
|
//This file is contributed by Martin Thelian
|
|
// [MC] moved some methods from robotsParser file that had been created by Alexander Schier to this class
|
|
//last major change: $LastChangedDate$ by $LastChangedBy$
|
|
//Revision: $LastChangedRevision$
|
|
//
|
|
//This program is free software; you can redistribute it and/or modify
|
|
//it under the terms of the GNU General Public License as published by
|
|
//the Free Software Foundation; either version 2 of the License, or
|
|
//(at your option) any later version.
|
|
//
|
|
//This program is distributed in the hope that it will be useful,
|
|
//but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
//GNU General Public License for more details.
|
|
//
|
|
//You should have received a copy of the GNU General Public License
|
|
//along with this program; if not, write to the Free Software
|
|
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
package de.anomic.crawler;
|
|
|
|
import java.io.IOException;
|
|
import java.net.MalformedURLException;
|
|
import java.util.ArrayList;
|
|
import java.util.Date;
|
|
import java.util.Map;
|
|
import java.util.concurrent.ConcurrentHashMap;
|
|
import java.util.regex.Pattern;
|
|
|
|
import org.apache.log4j.Logger;
|
|
|
|
import net.yacy.cora.document.MultiProtocolURI;
|
|
import net.yacy.cora.protocol.HeaderFramework;
|
|
import net.yacy.cora.protocol.RequestHeader;
|
|
import net.yacy.cora.protocol.ResponseHeader;
|
|
import net.yacy.cora.protocol.http.HTTPClient;
|
|
import net.yacy.kelondro.blob.BEncodedHeap;
|
|
import net.yacy.kelondro.index.RowSpaceExceededException;
|
|
import net.yacy.kelondro.io.ByteCount;
|
|
|
|
public class RobotsTxt {
|
|
|
|
private static Logger log = Logger.getLogger(RobotsTxt.class);
|
|
|
|
public static final String ROBOTS_DB_PATH_SEPARATOR = ";";
|
|
public static final Pattern ROBOTS_DB_PATH_SEPARATOR_MATCHER = Pattern.compile(ROBOTS_DB_PATH_SEPARATOR);
|
|
|
|
BEncodedHeap robotsTable;
|
|
private final ConcurrentHashMap<String, DomSync> syncObjects;
|
|
//private static final HashSet<String> loadedRobots = new HashSet<String>(); // only for debugging
|
|
|
|
private static class DomSync {
|
|
public DomSync() {}
|
|
}
|
|
|
|
public RobotsTxt(final BEncodedHeap robotsTable) {
|
|
this.robotsTable = robotsTable;
|
|
syncObjects = new ConcurrentHashMap<String, DomSync>();
|
|
log.info("initiated robots table: " + robotsTable.getFile());
|
|
}
|
|
|
|
public void clear() {
|
|
log.info("clearing robots table");
|
|
this.robotsTable.clear();
|
|
syncObjects.clear();
|
|
}
|
|
|
|
public int size() {
|
|
return this.robotsTable.size();
|
|
}
|
|
|
|
private RobotsEntry getEntry(final MultiProtocolURI theURL, final boolean fetchOnlineIfNotAvailableOrNotFresh) throws IOException {
|
|
// this method will always return a non-null value
|
|
String urlHostPort = getHostPort(theURL);
|
|
RobotsEntry robotsTxt4Host = null;
|
|
Map<String, byte[]> record;
|
|
try {
|
|
record = this.robotsTable.get(this.robotsTable.encodedKey(urlHostPort));
|
|
} catch (RowSpaceExceededException e) {
|
|
log.warn("memory exhausted", e);
|
|
record = null;
|
|
}
|
|
if (record != null) robotsTxt4Host = new RobotsEntry(urlHostPort, record);
|
|
|
|
if (fetchOnlineIfNotAvailableOrNotFresh && (
|
|
robotsTxt4Host == null ||
|
|
robotsTxt4Host.getLoadedDate() == null ||
|
|
System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() > 7*24*60*60*1000
|
|
)) {
|
|
|
|
// make or get a synchronization object
|
|
DomSync syncObj = this.syncObjects.get(urlHostPort);
|
|
if (syncObj == null) {
|
|
syncObj = new DomSync();
|
|
this.syncObjects.put(urlHostPort, syncObj);
|
|
}
|
|
|
|
// we can now synchronize for each host separately
|
|
synchronized (syncObj) {
|
|
|
|
// if we have not found any data or the data is older than 7 days, we need to load it from the remote server
|
|
|
|
// check the robots table again for all threads that come here because they waited for another one
|
|
// to complete a download
|
|
try {
|
|
record = this.robotsTable.get(this.robotsTable.encodedKey(urlHostPort));
|
|
} catch (RowSpaceExceededException e) {
|
|
log.warn("memory exhausted", e);
|
|
record = null;
|
|
}
|
|
if (record != null) robotsTxt4Host = new RobotsEntry(urlHostPort, record);
|
|
if (robotsTxt4Host != null &&
|
|
robotsTxt4Host.getLoadedDate() != null &&
|
|
System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() <= 1*24*60*60*1000) {
|
|
return robotsTxt4Host;
|
|
}
|
|
|
|
// generating the proper url to download the robots txt
|
|
MultiProtocolURI robotsURL = null;
|
|
try {
|
|
robotsURL = new MultiProtocolURI("http://" + urlHostPort + "/robots.txt");
|
|
} catch (final MalformedURLException e) {
|
|
log.fatal("Unable to generate robots.txt URL for host:port '" + urlHostPort + "'.", e);
|
|
robotsURL = null;
|
|
}
|
|
|
|
Object[] result = null;
|
|
if (robotsURL != null) {
|
|
if (log.isDebugEnabled()) log.debug("Trying to download the robots.txt file from URL '" + robotsURL + "'.");
|
|
try {
|
|
result = downloadRobotsTxt(robotsURL, 5, robotsTxt4Host);
|
|
} catch (final Exception e) {
|
|
result = null;
|
|
}
|
|
}
|
|
/*
|
|
assert !loadedRobots.contains(robotsURL.toNormalform(false, false)) :
|
|
"robots-url=" + robotsURL.toString() +
|
|
", robots=" + ((result == null || result[DOWNLOAD_ROBOTS_TXT] == null) ? "NULL" : UTF8.String((byte[]) result[DOWNLOAD_ROBOTS_TXT])) +
|
|
", robotsTxt4Host=" + ((robotsTxt4Host == null) ? "NULL" : robotsTxt4Host.getLoadedDate().toString());
|
|
loadedRobots.add(robotsURL.toNormalform(false, false));
|
|
*/
|
|
|
|
if (result == null) {
|
|
// no robots.txt available, make an entry to prevent that the robots loading is done twice
|
|
if (robotsTxt4Host == null) {
|
|
// generate artificial entry
|
|
robotsTxt4Host = new RobotsEntry(
|
|
robotsURL,
|
|
new ArrayList<String>(),
|
|
new ArrayList<String>(),
|
|
new Date(),
|
|
new Date(),
|
|
null,
|
|
null,
|
|
Integer.valueOf(0));
|
|
} else {
|
|
robotsTxt4Host.setLoadedDate(new Date());
|
|
}
|
|
|
|
// store the data into the robots DB
|
|
int sz = this.robotsTable.size();
|
|
addEntry(robotsTxt4Host);
|
|
if (this.robotsTable.size() <= sz) {
|
|
log.fatal("new entry in robots.txt table failed, resetting database");
|
|
this.clear();
|
|
addEntry(robotsTxt4Host);
|
|
}
|
|
} else {
|
|
final robotsParser parserResult = new robotsParser((byte[]) result[DOWNLOAD_ROBOTS_TXT]);
|
|
ArrayList<String> denyPath = parserResult.denyList();
|
|
if (((Boolean) result[DOWNLOAD_ACCESS_RESTRICTED]).booleanValue()) {
|
|
denyPath = new ArrayList<String>();
|
|
denyPath.add("/");
|
|
}
|
|
|
|
// store the data into the robots DB
|
|
robotsTxt4Host = addEntry(
|
|
robotsURL,
|
|
parserResult.allowList(),
|
|
denyPath,
|
|
new Date(),
|
|
(Date) result[DOWNLOAD_MODDATE],
|
|
(String) result[DOWNLOAD_ETAG],
|
|
parserResult.sitemap(),
|
|
parserResult.crawlDelayMillis());
|
|
}
|
|
}
|
|
}
|
|
|
|
return robotsTxt4Host;
|
|
}
|
|
|
|
private RobotsEntry addEntry(
|
|
final MultiProtocolURI theURL,
|
|
final ArrayList<String> allowPathList,
|
|
final ArrayList<String> denyPathList,
|
|
final Date loadedDate,
|
|
final Date modDate,
|
|
final String eTag,
|
|
final String sitemap,
|
|
final long crawlDelayMillis
|
|
) {
|
|
final RobotsEntry entry = new RobotsEntry(
|
|
theURL, allowPathList, denyPathList,
|
|
loadedDate, modDate,
|
|
eTag, sitemap, crawlDelayMillis);
|
|
addEntry(entry);
|
|
return entry;
|
|
}
|
|
|
|
private String addEntry(final RobotsEntry entry) {
|
|
// writes a new page and returns key
|
|
try {
|
|
this.robotsTable.insert(this.robotsTable.encodedKey(entry.hostName), entry.getMem());
|
|
return entry.hostName;
|
|
} catch (final Exception e) {
|
|
log.warn("cannot write robots.txt entry", e);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// methods that had been in robotsParser.java:
|
|
|
|
public static final int DOWNLOAD_ACCESS_RESTRICTED = 0;
|
|
public static final int DOWNLOAD_ROBOTS_TXT = 1;
|
|
public static final int DOWNLOAD_ETAG = 2;
|
|
public static final int DOWNLOAD_MODDATE = 3;
|
|
|
|
static final String getHostPort(final MultiProtocolURI theURL) {
|
|
String urlHostPort = null;
|
|
final int port = getPort(theURL);
|
|
urlHostPort = theURL.getHost() + ":" + port;
|
|
urlHostPort = urlHostPort.toLowerCase().intern();
|
|
|
|
return urlHostPort;
|
|
}
|
|
|
|
private static final int getPort(final MultiProtocolURI theURL) {
|
|
int port = theURL.getPort();
|
|
if (port == -1) {
|
|
if (theURL.getProtocol().equalsIgnoreCase("http")) {
|
|
port = 80;
|
|
} else if (theURL.getProtocol().equalsIgnoreCase("https")) {
|
|
port = 443;
|
|
}
|
|
|
|
}
|
|
return port;
|
|
}
|
|
|
|
public MultiProtocolURI getSitemapURL(final MultiProtocolURI theURL) {
|
|
if (theURL == null) throw new IllegalArgumentException();
|
|
if (!theURL.getProtocol().startsWith("http")) return null;
|
|
MultiProtocolURI sitemapURL = null;
|
|
|
|
// generating the hostname:poart string needed to do a DB lookup
|
|
RobotsEntry robotsTxt4Host;
|
|
try {
|
|
robotsTxt4Host = this.getEntry(theURL, true);
|
|
} catch (IOException e1) {
|
|
return null;
|
|
}
|
|
|
|
try {
|
|
final String sitemapUrlStr = robotsTxt4Host.getSitemap();
|
|
if (sitemapUrlStr != null) sitemapURL = new MultiProtocolURI(sitemapUrlStr);
|
|
} catch (final MalformedURLException e) {/* ignore this */}
|
|
|
|
return sitemapURL;
|
|
}
|
|
|
|
public long getCrawlDelayMillis(final MultiProtocolURI theURL) {
|
|
if (theURL == null) throw new IllegalArgumentException();
|
|
if (!theURL.getProtocol().startsWith("http")) return 0;
|
|
|
|
RobotsEntry robotsEntry;
|
|
try {
|
|
robotsEntry = getEntry(theURL, true);
|
|
} catch (IOException e) {
|
|
log.warn("cannot load robots.txt entry", e);
|
|
return 0;
|
|
}
|
|
return robotsEntry.getCrawlDelayMillis();
|
|
}
|
|
|
|
public boolean isDisallowed(final MultiProtocolURI nexturl) {
|
|
if (nexturl == null) throw new IllegalArgumentException();
|
|
if (!nexturl.getProtocol().startsWith("http")) return false;
|
|
|
|
// generating the hostname:port string needed to do a DB lookup
|
|
RobotsEntry robotsTxt4Host = null;
|
|
try {
|
|
robotsTxt4Host = getEntry(nexturl, true);
|
|
} catch (IOException e) {
|
|
log.warn("cannot load robots.txt entry", e);
|
|
return false;
|
|
}
|
|
return robotsTxt4Host.isDisallowed(nexturl.getFile());
|
|
}
|
|
|
|
private static Object[] downloadRobotsTxt(final MultiProtocolURI robotsURL, int redirectionCount, final RobotsEntry entry) throws Exception {
|
|
if (robotsURL == null || !robotsURL.getProtocol().startsWith("http")) return null;
|
|
|
|
if (redirectionCount < 0) return new Object[]{Boolean.FALSE,null,null};
|
|
redirectionCount--;
|
|
|
|
boolean accessCompletelyRestricted = false;
|
|
byte[] robotsTxt = null;
|
|
long downloadStart, downloadEnd;
|
|
String eTag=null, oldEtag = null;
|
|
Date lastMod=null;
|
|
downloadStart = System.currentTimeMillis();
|
|
|
|
// if we previously have downloaded this robots.txt then we can set the if-modified-since header
|
|
RequestHeader reqHeaders = new RequestHeader();
|
|
|
|
// add yacybot user agent
|
|
reqHeaders.put(HeaderFramework.USER_AGENT, MultiProtocolURI.yacybotUserAgent);
|
|
|
|
// adding referer
|
|
reqHeaders.put(RequestHeader.REFERER, (MultiProtocolURI.newURL(robotsURL,"/")).toNormalform(true, true));
|
|
|
|
if (entry != null) {
|
|
oldEtag = entry.getETag();
|
|
reqHeaders = new RequestHeader();
|
|
final Date modDate = entry.getModDate();
|
|
if (modDate != null) reqHeaders.put(RequestHeader.IF_MODIFIED_SINCE, HeaderFramework.formatRFC1123(entry.getModDate()));
|
|
|
|
}
|
|
|
|
// setup http-client
|
|
//TODO: adding Traffic statistic for robots download?
|
|
final HTTPClient client = new HTTPClient();
|
|
client.setHeader(reqHeaders.entrySet());
|
|
try {
|
|
// check for interruption
|
|
if (Thread.currentThread().isInterrupted()) throw new InterruptedException("Shutdown in progress.");
|
|
|
|
// sending the get request
|
|
robotsTxt = client.GETbytes(robotsURL.toString());
|
|
// statistics:
|
|
if (robotsTxt != null) {
|
|
ByteCount.addAccountCount(ByteCount.CRAWLER, robotsTxt.length);
|
|
}
|
|
final int code = client.getHttpResponse().getStatusLine().getStatusCode();
|
|
final ResponseHeader header = new ResponseHeader(client.getHttpResponse().getAllHeaders());
|
|
|
|
// check the response status
|
|
if (code > 199 && code < 300) {
|
|
if (!header.mime().startsWith("text/plain")) {
|
|
robotsTxt = null;
|
|
log.info("Robots.txt from URL '" + robotsURL + "' has wrong mimetype '" + header.mime() + "'.");
|
|
} else {
|
|
|
|
// getting some metadata
|
|
eTag = header.containsKey(HeaderFramework.ETAG)?(header.get(HeaderFramework.ETAG)).trim():null;
|
|
lastMod = header.lastModified();
|
|
|
|
// if the robots.txt file was not changed we break here
|
|
if ((eTag != null) && (oldEtag != null) && (eTag.equals(oldEtag))) {
|
|
if (log.isDebugEnabled()) log.debug("Robots.txt from URL '" + robotsURL + "' was not modified. Abort downloading of new version.");
|
|
return null;
|
|
}
|
|
|
|
|
|
downloadEnd = System.currentTimeMillis();
|
|
if (log.isDebugEnabled()) log.debug("Robots.txt successfully loaded from URL '" + robotsURL + "' in " + (downloadEnd-downloadStart) + " ms.");
|
|
}
|
|
} else if (code == 304) {
|
|
return null;
|
|
} else if (code > 299 && code < 400) {
|
|
// getting redirection URL
|
|
String redirectionUrlString = header.get(HeaderFramework.LOCATION);
|
|
if (redirectionUrlString==null) {
|
|
if (log.isDebugEnabled())
|
|
log.debug("robots.txt could not be downloaded from URL '" + robotsURL + "' because of missing redirecton header. [" + client.getHttpResponse().getStatusLine() + "].");
|
|
robotsTxt = null;
|
|
} else {
|
|
|
|
redirectionUrlString = redirectionUrlString.trim();
|
|
|
|
// generating the new URL object
|
|
final MultiProtocolURI redirectionUrl = MultiProtocolURI.newURL(robotsURL, redirectionUrlString);
|
|
|
|
// following the redirection
|
|
if (log.isDebugEnabled()) log.debug("Redirection detected for robots.txt with URL '" + robotsURL + "'." +
|
|
"\nRedirecting request to: " + redirectionUrl);
|
|
return downloadRobotsTxt(redirectionUrl,redirectionCount,entry);
|
|
}
|
|
} else if (code == 401 || code == 403) {
|
|
accessCompletelyRestricted = true;
|
|
if (log.isDebugEnabled()) log.debug("Access to Robots.txt not allowed on URL '" + robotsURL + "'.");
|
|
} else {
|
|
if (log.isDebugEnabled())
|
|
log.debug("robots.txt could not be downloaded from URL '" + robotsURL + "'. [" + client.getHttpResponse().getStatusLine() + "].");
|
|
robotsTxt = null;
|
|
}
|
|
} catch (final Exception e) {
|
|
throw e;
|
|
}
|
|
return new Object[]{Boolean.valueOf(accessCompletelyRestricted),robotsTxt,eTag,lastMod};
|
|
}
|
|
}
|