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.
418 lines
19 KiB
418 lines
19 KiB
//robotsParser.java
|
|
//-------------------------------------
|
|
//part of YACY
|
|
//(C) by Michael Peter Christen; mc@anomic.de
|
|
//first published on http://www.anomic.de
|
|
//Frankfurt, Germany, 2004
|
|
//
|
|
//This file ist contributed by Alexander Schier
|
|
//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
|
|
//
|
|
//Using this software in any meaning (reading, learning, copying, compiling,
|
|
//running) means that you agree that the Author(s) is (are) not responsible
|
|
//for cost, loss of data or any harm that may be caused directly or indirectly
|
|
//by usage of this softare or this documentation. The usage of this software
|
|
//is on your own risk. The installation and usage (starting/running) of this
|
|
//software may allow other people or application to access your computer and
|
|
//any attached devices and is highly dependent on the configuration of the
|
|
//software which must be done by the user of the software; the author(s) is
|
|
//(are) also not responsible for proper configuration and usage of the
|
|
//software, even if provoked by documentation provided together with
|
|
//the software.
|
|
//
|
|
//Any changes to this file according to the GPL as documented in the file
|
|
//gpl.txt aside this file in the shipment you received can be done to the
|
|
//lines that follows this copyright notice here, but changes must not be
|
|
//done inside the copyright notive above. A re-distribution must contain
|
|
//the intact and unchanged copyright notice.
|
|
//Contributions and changes to the program code must be marked as such.
|
|
|
|
package de.anomic.data;
|
|
|
|
import java.io.BufferedReader;
|
|
import java.io.ByteArrayInputStream;
|
|
import java.io.File;
|
|
import java.io.FileReader;
|
|
import java.io.IOException;
|
|
import java.io.InputStreamReader;
|
|
import java.net.MalformedURLException;
|
|
import java.net.URL;
|
|
import java.net.URLDecoder;
|
|
import java.util.ArrayList;
|
|
import java.util.Date;
|
|
|
|
import de.anomic.http.httpHeader;
|
|
import de.anomic.http.httpc;
|
|
import de.anomic.plasma.plasmaCrawlRobotsTxt;
|
|
import de.anomic.plasma.plasmaSwitchboard;
|
|
import de.anomic.server.logging.serverLog;
|
|
|
|
/*
|
|
* A class for Parsing robots.txt files.
|
|
* It only parses the Deny Part, yet.
|
|
*
|
|
* Robots RFC
|
|
* http://www.robotstxt.org/wc/norobots-rfc.html
|
|
*
|
|
* TODO:
|
|
* - On the request attempt resulted in temporary failure a robot
|
|
* should defer visits to the site until such time as the resource
|
|
* can be retrieved.
|
|
*
|
|
* - Extended Standard for Robot Exclusion
|
|
* See: http://www.conman.org/people/spc/robots2.html
|
|
*
|
|
* - Robot Exclusion Standard Revisited
|
|
* See: http://www.kollar.com/robots.html
|
|
*/
|
|
public final class robotsParser{
|
|
|
|
public static final String ROBOTS_USER_AGENT = "User-agent:".toUpperCase();
|
|
public static final String ROBOTS_DISALLOW = "Disallow:".toUpperCase();
|
|
public static final String ROBOTS_ALLOW = "Allow:".toUpperCase();
|
|
public static final String ROBOTS_COMMENT = "#";
|
|
|
|
/*public robotsParser(URL robotsUrl){
|
|
}*/
|
|
/*
|
|
* this parses the robots.txt.
|
|
* at the Moment it only creates a list of Deny Paths
|
|
*/
|
|
|
|
public static ArrayList parse(File robotsFile) throws IOException {
|
|
BufferedReader reader = null;
|
|
try {
|
|
reader = new BufferedReader(new FileReader(robotsFile));
|
|
return parse(reader);
|
|
} finally {
|
|
if (reader != null) try{reader.close();}catch(Exception e){}
|
|
}
|
|
}
|
|
|
|
public static ArrayList parse(byte[] robotsTxt) throws IOException {
|
|
if ((robotsTxt == null)||(robotsTxt.length == 0)) return new ArrayList(0);
|
|
ByteArrayInputStream bin = new ByteArrayInputStream(robotsTxt);
|
|
BufferedReader reader = new BufferedReader(new InputStreamReader(bin));
|
|
return parse(reader);
|
|
}
|
|
|
|
public static ArrayList parse(BufferedReader reader) throws IOException{
|
|
ArrayList deny4AllAgents = new ArrayList();
|
|
ArrayList deny4YaCyAgent = new ArrayList();
|
|
|
|
int pos;
|
|
String line = null, lineUpper = null;
|
|
boolean isRuleBlock4AllAgents = false,
|
|
isRuleBlock4YaCyAgent = false,
|
|
rule4YaCyFound = false,
|
|
inBlock = false;
|
|
|
|
while ((line = reader.readLine()) != null) {
|
|
line = line.trim();
|
|
lineUpper = line.toUpperCase();
|
|
|
|
if (line.length() == 0) {
|
|
// OLD: we have reached the end of the rule block
|
|
// rule4Yacy = false; inBlock = false;
|
|
|
|
// NEW: just ignore it
|
|
} else if (line.startsWith(ROBOTS_COMMENT)) {
|
|
// we can ignore this. Just a comment line
|
|
} else if (lineUpper.startsWith(ROBOTS_USER_AGENT)) {
|
|
|
|
if (inBlock) {
|
|
// we have detected the start of a new block
|
|
inBlock = false;
|
|
isRuleBlock4AllAgents = false;
|
|
isRuleBlock4YaCyAgent = false;
|
|
}
|
|
|
|
// cutting off comments at the line end
|
|
pos = line.indexOf(ROBOTS_COMMENT);
|
|
if (pos != -1) line = line.substring(0,pos).trim();
|
|
|
|
// replacing all tabs with spaces
|
|
line = line.replaceAll("\t"," ");
|
|
|
|
// getting out the robots name
|
|
pos = line.indexOf(" ");
|
|
if (pos != -1) {
|
|
String userAgent = line.substring(pos).trim();
|
|
isRuleBlock4AllAgents |= userAgent.equals("*");
|
|
isRuleBlock4YaCyAgent |= userAgent.toLowerCase().indexOf("yacy") >=0;
|
|
if (isRuleBlock4YaCyAgent) rule4YaCyFound = true;
|
|
}
|
|
} else if (lineUpper.startsWith(ROBOTS_DISALLOW) ||
|
|
lineUpper.startsWith(ROBOTS_ALLOW)) {
|
|
inBlock = true;
|
|
boolean isDisallowRule = lineUpper.startsWith(ROBOTS_DISALLOW);
|
|
|
|
if (isRuleBlock4YaCyAgent || isRuleBlock4AllAgents) {
|
|
// cutting off comments at the line end
|
|
pos = line.indexOf(ROBOTS_COMMENT);
|
|
if (pos != -1) line = line.substring(0,pos).trim();
|
|
|
|
// cutting of tailing *
|
|
if (line.endsWith("*")) line = line.substring(0,line.length()-1);
|
|
|
|
// replacing all tabs with spaces
|
|
line = line.replaceAll("\t"," ");
|
|
|
|
// getting the path
|
|
pos = line.indexOf(" ");
|
|
if (pos != -1) {
|
|
// getting the path
|
|
String path = line.substring(pos).trim();
|
|
|
|
// unencoding all special charsx
|
|
try {
|
|
path = URLDecoder.decode(path,"UTF-8");
|
|
} catch (Exception e) {
|
|
/*
|
|
* url decoding failed. E.g. because of
|
|
* "Incomplete trailing escape (%) pattern"
|
|
*/
|
|
}
|
|
|
|
// escaping all occurences of ; because this char is used as special char in the Robots DB
|
|
path = path.replaceAll(plasmaCrawlRobotsTxt.ROBOTS_DB_PATH_SEPARATOR,"%3B");
|
|
|
|
// adding it to the pathlist
|
|
if (!isDisallowRule) path = "!" + path;
|
|
if (isRuleBlock4AllAgents) deny4AllAgents.add(path);
|
|
if (isRuleBlock4YaCyAgent) deny4YaCyAgent.add(path);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return (rule4YaCyFound)?deny4YaCyAgent:deny4AllAgents;
|
|
}
|
|
|
|
public static boolean isDisallowed(URL nexturl) {
|
|
if (nexturl == null) throw new IllegalArgumentException();
|
|
|
|
// generating the hostname:poart string needed to do a DB lookup
|
|
String urlHostPort = null;
|
|
int port = nexturl.getPort();
|
|
if (port == -1) {
|
|
if (nexturl.getProtocol().equalsIgnoreCase("http")) {
|
|
port = 80;
|
|
} else if (nexturl.getProtocol().equalsIgnoreCase("https")) {
|
|
port = 443;
|
|
}
|
|
|
|
}
|
|
urlHostPort = nexturl.getHost() + ":" + port;
|
|
urlHostPort = urlHostPort.toLowerCase().intern();
|
|
|
|
plasmaCrawlRobotsTxt.Entry robotsTxt4Host = null;
|
|
synchronized(urlHostPort) {
|
|
// doing a DB lookup to determine if the robots data is already available
|
|
robotsTxt4Host = plasmaSwitchboard.robots.getEntry(urlHostPort);
|
|
|
|
// if we have not found any data or the data is older than 7 days, we need to load it from the remote server
|
|
if (
|
|
(robotsTxt4Host == null) ||
|
|
(robotsTxt4Host.getLoadedDate() == null) ||
|
|
(System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() > 7*24*60*60*1000)
|
|
) {
|
|
URL robotsURL = null;
|
|
// generating the proper url to download the robots txt
|
|
try {
|
|
robotsURL = new URL(nexturl.getProtocol(),nexturl.getHost(),port,"/robots.txt");
|
|
} catch (MalformedURLException e) {
|
|
serverLog.logSevere("ROBOTS","Unable to generate robots.txt URL for URL '" + nexturl.toString() + "'.");
|
|
return false;
|
|
}
|
|
|
|
Object[] result = null;
|
|
boolean accessCompletelyRestricted = false;
|
|
byte[] robotsTxt = null;
|
|
String eTag = null;
|
|
Date modDate = null;
|
|
try {
|
|
serverLog.logFine("ROBOTS","Trying to download the robots.txt file from URL '" + robotsURL + "'.");
|
|
result = downloadRobotsTxt(robotsURL,5,robotsTxt4Host);
|
|
|
|
if (result != null) {
|
|
accessCompletelyRestricted = ((Boolean)result[0]).booleanValue();
|
|
robotsTxt = (byte[])result[1];
|
|
eTag = (String) result[2];
|
|
modDate = (Date) result[3];
|
|
} else if (robotsTxt4Host != null) {
|
|
robotsTxt4Host.setLoadedDate(new Date());
|
|
plasmaSwitchboard.robots.addEntry(robotsTxt4Host);
|
|
}
|
|
} catch (Exception e) {
|
|
serverLog.logSevere("ROBOTS","Unable to download the robots.txt file from URL '" + robotsURL + "'. " + e.getMessage());
|
|
}
|
|
|
|
if ((robotsTxt4Host==null)||((robotsTxt4Host!=null)&&(result!=null))) {
|
|
ArrayList denyPath = null;
|
|
if (accessCompletelyRestricted) {
|
|
denyPath = new ArrayList();
|
|
denyPath.add("/");
|
|
} else {
|
|
// parsing the robots.txt Data and converting it into an arraylist
|
|
try {
|
|
denyPath = robotsParser.parse(robotsTxt);
|
|
} catch (IOException e) {
|
|
serverLog.logSevere("ROBOTS","Unable to parse the robots.txt file from URL '" + robotsURL + "'.");
|
|
}
|
|
}
|
|
|
|
// storing the data into the robots DB
|
|
robotsTxt4Host = plasmaSwitchboard.robots.addEntry(urlHostPort,denyPath,new Date(),modDate,eTag);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (robotsTxt4Host.isDisallowed(nexturl.getFile())) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
private static Object[] downloadRobotsTxt(URL robotsURL, int redirectionCount, plasmaCrawlRobotsTxt.Entry entry) throws Exception {
|
|
|
|
if (redirectionCount < 0) return new Object[]{Boolean.FALSE,null,null};
|
|
redirectionCount--;
|
|
|
|
boolean accessCompletelyRestricted = false;
|
|
byte[] robotsTxt = null;
|
|
httpc con = null;
|
|
long downloadStart, downloadEnd;
|
|
String eTag=null, oldEtag = null;
|
|
Date lastMod=null;
|
|
try {
|
|
downloadStart = System.currentTimeMillis();
|
|
plasmaSwitchboard sb = plasmaSwitchboard.getSwitchboard();
|
|
//TODO: adding Traffic statistic for robots download?
|
|
if (
|
|
(sb == null) ||
|
|
(sb.remoteProxyConfig == null) ||
|
|
(!sb.remoteProxyConfig.useProxy())
|
|
) {
|
|
con = httpc.getInstance(robotsURL.getHost(), robotsURL.getPort(), 10000, robotsURL.getProtocol().equalsIgnoreCase("https"));
|
|
} else {
|
|
con = httpc.getInstance(robotsURL.getHost(), robotsURL.getPort(), 10000, robotsURL.getProtocol().equalsIgnoreCase("https"), sb.remoteProxyConfig);
|
|
}
|
|
|
|
// if we previously have downloaded this robots.txt then we can set the if-modified-since header
|
|
httpHeader reqHeaders = new httpHeader();
|
|
|
|
// adding referer
|
|
reqHeaders.put(httpHeader.REFERER, (new URL(robotsURL,"/")).toString());
|
|
|
|
if (entry != null) {
|
|
oldEtag = entry.getETag();
|
|
reqHeaders = new httpHeader();
|
|
Date modDate = entry.getModDate();
|
|
if (modDate != null) reqHeaders.put(httpHeader.IF_MODIFIED_SINCE,httpc.dateString(entry.getModDate()));
|
|
|
|
}
|
|
|
|
httpc.response res = con.GET(robotsURL.getFile(), reqHeaders);
|
|
if (res.status.startsWith("2")) {
|
|
if (!res.responseHeader.mime().startsWith("text/plain")) {
|
|
robotsTxt = null;
|
|
serverLog.logFinest("ROBOTS","Robots.txt from URL '" + robotsURL + "' has wrong mimetype '" + res.responseHeader.mime() + "'.");
|
|
} else {
|
|
|
|
// getting some metadata
|
|
eTag = res.responseHeader.containsKey(httpHeader.ETAG)?((String)res.responseHeader.get(httpHeader.ETAG)).trim():null;
|
|
lastMod = res.responseHeader.lastModified();
|
|
|
|
// if the robots.txt file was not changed we break here
|
|
if ((eTag != null) && (oldEtag != null) && (eTag.equals(oldEtag))) {
|
|
serverLog.logFinest("ROBOTS","Robots.txt from URL '" + robotsURL + "' was not modified. Abort downloading of new version.");
|
|
return null;
|
|
}
|
|
|
|
// downloading the content
|
|
robotsTxt = res.writeContent();
|
|
con.close();
|
|
|
|
downloadEnd = System.currentTimeMillis();
|
|
serverLog.logFinest("ROBOTS","Robots.txt successfully loaded from URL '" + robotsURL + "' in " + (downloadEnd-downloadStart) + " ms.");
|
|
}
|
|
} else if (res.status.startsWith("304")) {
|
|
return null;
|
|
} else if (res.status.startsWith("3")) {
|
|
// getting redirection URL
|
|
String redirectionUrlString = (String) res.responseHeader.get(httpHeader.LOCATION);
|
|
if (redirectionUrlString==null) {
|
|
serverLog.logFinest("ROBOTS","robots.txt could not be downloaded from URL '" + robotsURL + "' because of missing redirecton header. [" + res.status + "].");
|
|
robotsTxt = null;
|
|
}
|
|
|
|
redirectionUrlString = redirectionUrlString.trim();
|
|
|
|
// generating the new URL object
|
|
URL redirectionUrl = new URL(robotsURL, redirectionUrlString);
|
|
|
|
// returning the used httpc
|
|
httpc.returnInstance(con);
|
|
con = null;
|
|
|
|
// following the redirection
|
|
serverLog.logFinest("ROBOTS","Redirection detected for robots.txt with URL '" + robotsURL + "'." +
|
|
"\nRedirecting request to: " + redirectionUrl);
|
|
return downloadRobotsTxt(redirectionUrl,redirectionCount,entry);
|
|
|
|
} else if (res.status.startsWith("401") || res.status.startsWith("403")) {
|
|
accessCompletelyRestricted = true;
|
|
serverLog.logFinest("ROBOTS","Access to Robots.txt not allowed on URL '" + robotsURL + "'.");
|
|
} else {
|
|
serverLog.logFinest("ROBOTS","robots.txt could not be downloaded from URL '" + robotsURL + "'. [" + res.status + "].");
|
|
robotsTxt = null;
|
|
}
|
|
} catch (Exception e) {
|
|
throw e;
|
|
} finally {
|
|
if (con != null) httpc.returnInstance(con);
|
|
}
|
|
return new Object[]{new Boolean(accessCompletelyRestricted),robotsTxt,eTag,lastMod};
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
try {
|
|
//robotsParser parser = new robotsParser();
|
|
|
|
URL robotsURL = new URL("http://www.bigfoot2002.de.vu/robots.txt");
|
|
Object[] result = downloadRobotsTxt(robotsURL,5,null);
|
|
|
|
if (result != null) {
|
|
boolean accessCompletelyRestricted = ((Boolean)result[0]).booleanValue();
|
|
byte[] robotsTxt = (byte[])result[1];
|
|
//String eTag = (String) result[2];
|
|
//Date modDate = (Date) result[3];
|
|
|
|
if (!accessCompletelyRestricted) {
|
|
/*ArrayList denyPath =*/ robotsParser.parse(robotsTxt);
|
|
}
|
|
|
|
}
|
|
}catch(Exception e) {
|
|
e.printStackTrace();
|
|
}
|
|
}
|
|
|
|
}
|