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//plasmaCrawlRobotsTxt.java
//-------------------------------------
//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
//Frankfurt, Germany, 2004
//
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//This file is contributed by Martin Thelian
// [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 $LastChangedBy$
//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
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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 ;
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 ;
import net.yacy.cora.protocol.RequestHeader ;
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 net.yacy.kelondro.io.ByteCount ;
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public class RobotsTxt {
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private static Logger log = Logger . getLogger ( RobotsTxt . class ) ;
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 {
public DomSync ( ) { }
}
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public RobotsTxt ( final BEncodedHeap robotsTable ) {
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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}
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 ;
try {
record = this . robotsTable . get ( this . robotsTable . encodedKey ( urlHostPort ) ) ;
} catch ( RowSpaceExceededException e ) {
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log . warn ( " memory exhausted " , e ) ;
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record = null ;
}
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if ( record ! = null ) robotsTxt4Host = new RobotsEntry ( urlHostPort , record ) ;
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if ( fetchOnlineIfNotAvailableOrNotFresh & & (
robotsTxt4Host = = null | |
robotsTxt4Host . getLoadedDate ( ) = = null | |
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
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
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try {
record = this . robotsTable . get ( this . robotsTable . encodedKey ( urlHostPort ) ) ;
} catch ( RowSpaceExceededException e ) {
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log . warn ( " memory exhausted " , e ) ;
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record = null ;
}
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if ( record ! = null ) robotsTxt4Host = new RobotsEntry ( urlHostPort , record ) ;
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if ( robotsTxt4Host ! = null & &
robotsTxt4Host . getLoadedDate ( ) ! = null & &
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System . currentTimeMillis ( ) - robotsTxt4Host . getLoadedDate ( ) . getTime ( ) < = 1 * 24 * 60 * 60 * 1000 ) {
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return robotsTxt4Host ;
}
// 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 ;
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 {
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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/ *
assert ! loadedRobots . contains ( robotsURL . toNormalform ( false , false ) ) :
" robots-url= " + robotsURL . toString ( ) +
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" , robots= " + ( ( result = = null | | result [ DOWNLOAD_ROBOTS_TXT ] = = null ) ? " NULL " : UTF8 . String ( ( byte [ ] ) result [ DOWNLOAD_ROBOTS_TXT ] ) ) +
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" , robotsTxt4Host= " + ( ( robotsTxt4Host = = null ) ? " NULL " : robotsTxt4Host . getLoadedDate ( ) . toString ( ) ) ;
loadedRobots . add ( robotsURL . toNormalform ( false , false ) ) ;
* /
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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
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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 ( ) ,
new Date ( ) ,
null ,
null ,
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Integer . valueOf ( 0 ) ) ;
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} else {
robotsTxt4Host . setLoadedDate ( new Date ( ) ) ;
}
// 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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} 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 ( ) ) {
denyPath = new ArrayList < String > ( ) ;
denyPath . add ( " / " ) ;
}
// store the data into the robots DB
robotsTxt4Host = addEntry (
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robotsURL ,
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parserResult . allowList ( ) ,
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denyPath ,
new Date ( ) ,
( Date ) result [ DOWNLOAD_MODDATE ] ,
( String ) result [ DOWNLOAD_ETAG ] ,
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parserResult . sitemap ( ) ,
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parserResult . crawlDelayMillis ( ) ) ;
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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 ,
final ArrayList < String > denyPathList ,
final Date loadedDate ,
final Date modDate ,
final String eTag ,
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 ,
loadedDate , modDate ,
eTag , sitemap , crawlDelayMillis ) ;
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addEntry ( entry ) ;
return entry ;
}
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private String addEntry ( final RobotsEntry entry ) {
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// writes a new page and returns key
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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// 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 ;
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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 ;
urlHostPort = urlHostPort . toLowerCase ( ) . intern ( ) ;
return urlHostPort ;
}
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private static final int getPort ( final MultiProtocolURI theURL ) {
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int port = theURL . getPort ( ) ;
if ( port = = - 1 ) {
if ( theURL . getProtocol ( ) . equalsIgnoreCase ( " http " ) ) {
port = 80 ;
} else if ( theURL . getProtocol ( ) . equalsIgnoreCase ( " https " ) ) {
port = 443 ;
}
}
return port ;
}
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public MultiProtocolURI getSitemapURL ( final MultiProtocolURI theURL ) {
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if ( theURL = = null ) throw new IllegalArgumentException ( ) ;
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 ;
try {
robotsTxt4Host = this . getEntry ( theURL , true ) ;
} catch ( IOException e1 ) {
return null ;
}
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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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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 ;
try {
robotsEntry = getEntry ( theURL , true ) ;
} 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 ( ) ;
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 {
robotsTxt4Host = getEntry ( nexturl , true ) ;
} 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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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 } ;
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
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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 , MultiProtocolURI . yacybotUserAgent ) ;
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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 ) {
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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}
// setup http-client
//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 {
// check for interruption
if ( Thread . currentThread ( ) . isInterrupted ( ) ) throw new InterruptedException ( " Shutdown in progress. " ) ;
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// sending the get request
robotsTxt = client . GETbytes ( robotsURL . toString ( ) ) ;
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// statistics:
if ( robotsTxt ! = null ) {
ByteCount . addAccountCount ( ByteCount . CRAWLER , robotsTxt . length ) ;
}
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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 ) {
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 {
// getting some metadata
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eTag = header . containsKey ( HeaderFramework . ETAG ) ? ( header . get ( HeaderFramework . ETAG ) ) . trim ( ) : null ;
lastMod = header . lastModified ( ) ;
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// if the robots.txt file was not changed we break here
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 ;
}
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 ( ) )
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 ;
} else {
redirectionUrlString = redirectionUrlString . trim ( ) ;
// 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 ) ;
return downloadRobotsTxt ( redirectionUrl , redirectionCount , entry ) ;
}
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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 ( ) )
log . debug ( " robots.txt could not be downloaded from URL ' " + robotsURL + " '. [ " + client . getHttpResponse ( ) . getStatusLine ( ) + " ]. " ) ;
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robotsTxt = null ;
}
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} catch ( final Exception e ) {
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throw e ;
}
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return new Object [ ] { Boolean . valueOf ( accessCompletelyRestricted ) , robotsTxt , eTag , lastMod } ;
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}
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}