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243 lines
9.3 KiB
243 lines
9.3 KiB
//RobotsEntry.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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// [MC] redesign: removed entry object from RobotsTxt Class into this separate 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 net.yacy.crawler.robots;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.LinkedHashMap;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import net.yacy.cora.document.encoding.ASCII;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.cora.util.ByteArray;
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public class RobotsTxtEntry {
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private static final String HOST_NAME = "hostname";
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private static final String ALLOW_PATH_LIST = "allow";
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private static final String DISALLOW_PATH_LIST = "disallow";
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private static final String SITEMAP_LIST = "sitemap";
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private static final String LOADED_DATE = "date";
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private static final String MOD_DATE = "modDate";
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private static final String ETAG = "etag";
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private static final String CRAWL_DELAY = "crawlDelay";
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private static final String CRAWL_DELAY_MILLIS = "crawlDelayMillis";
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private static final String AGENT_NAME = "agentname";
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// this is a simple record structure that holds all properties of a single crawl start
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private final Map<String, byte[]> mem;
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private final List<String> allowPathList, denyPathList, sitemapList;
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private final String hostName, agentName;
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private String info; // this is filled if robots disallowed access; then the reason is noted there;
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protected RobotsTxtEntry(final String hostName, final Map<String, byte[]> mem) {
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this.hostName = hostName.toLowerCase();
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this.mem = mem;
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this.info = "";
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this.denyPathList = new LinkedList<String>();
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fillMultiValue(this.denyPathList, DISALLOW_PATH_LIST);
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this.allowPathList = new LinkedList<String>();
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fillMultiValue(this.allowPathList, ALLOW_PATH_LIST);
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this.sitemapList = new LinkedList<String>();
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fillMultiValue(this.sitemapList, SITEMAP_LIST);
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this.agentName = this.mem.containsKey(AGENT_NAME) ? UTF8.String(this.mem.get(AGENT_NAME)) : null;
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}
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private void fillMultiValue(List<String> list, String listName) {
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if (this.mem.containsKey(listName)) {
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final String csPl = UTF8.String(this.mem.get(listName));
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if (csPl.length() > 0){
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final String[] pathArray = csPl.split(RobotsTxt.ROBOTS_DB_PATH_SEPARATOR);
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if ((pathArray != null) && (pathArray.length > 0)) {
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list.addAll(Arrays.asList(pathArray));
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}
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}
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}
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}
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protected RobotsTxtEntry(
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final MultiProtocolURL theURL,
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final List<String> allowPathList,
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final List<String> disallowPathList,
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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 List<String> sitemapList,
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final long crawlDelayMillis,
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final String agentName
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) {
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if (theURL == null) throw new IllegalArgumentException("The url is missing");
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this.hostName = RobotsTxt.getHostPort(theURL).toLowerCase();
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this.allowPathList = new LinkedList<String>();
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this.denyPathList = new LinkedList<String>();
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this.sitemapList = new LinkedList<String>();
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this.agentName = agentName;
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this.mem = new LinkedHashMap<String, byte[]>(10);
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this.mem.put(HOST_NAME, UTF8.getBytes(this.hostName));
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if (loadedDate != null) this.mem.put(LOADED_DATE, ASCII.getBytes(Long.toString(loadedDate.getTime())));
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if (modDate != null) this.mem.put(MOD_DATE, ASCII.getBytes(Long.toString(modDate.getTime())));
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if (eTag != null) this.mem.put(ETAG, UTF8.getBytes(eTag));
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if (crawlDelayMillis > 0) this.mem.put(CRAWL_DELAY_MILLIS, ASCII.getBytes(Long.toString(crawlDelayMillis)));
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if (agentName != null) this.mem.put(AGENT_NAME, UTF8.getBytes(agentName));
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readMultiValue(allowPathList, this.allowPathList, ALLOW_PATH_LIST);
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readMultiValue(disallowPathList, this.denyPathList, DISALLOW_PATH_LIST);
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readMultiValue(sitemapList, this.sitemapList, SITEMAP_LIST);
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}
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private void readMultiValue(List<String> externallist, List<String> internallist, String listName) {
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if (externallist != null && !externallist.isEmpty()) {
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internallist.addAll(externallist);
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final StringBuilder pathListStr = new StringBuilder(externallist.size() * 30);
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for (final String element : externallist) {
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pathListStr.append(element).append(RobotsTxt.ROBOTS_DB_PATH_SEPARATOR);
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}
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this.mem.put(listName, UTF8.getBytes(pathListStr.substring(0, pathListStr.length()-1)));
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}
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}
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protected String getHostName() {
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return this.hostName;
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}
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public String getAgentName() {
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return this.agentName;
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}
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protected Map<String, byte[]> getMem() {
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if (!this.mem.containsKey(HOST_NAME)) this.mem.put(HOST_NAME, UTF8.getBytes(this.hostName));
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return this.mem;
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}
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@Override
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public String toString() {
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final StringBuilder str = new StringBuilder(6000);
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str.append((this.hostName == null) ? "null" : this.hostName).append(": ");
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if (this.mem != null) {
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str.append('{');
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for (Map.Entry<String, byte[]> entry: this.mem.entrySet()) {
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str.append(entry.getKey());
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str.append('=');
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str.append(UTF8.String(entry.getValue()));
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str.append(',');
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}
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str.append('}');
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}
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return str.toString();
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}
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/**
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* get the sitemap urls
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* @return a list of sitemap urls (possibly empty), but not null
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*/
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public List<String> getSitemaps() {
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return this.sitemapList;
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}
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protected Date getLoadedDate() {
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if (this.mem.containsKey(LOADED_DATE)) {
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return new Date(ByteArray.parseDecimal(this.mem.get(LOADED_DATE)));
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}
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return null;
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}
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protected void setLoadedDate(final Date newLoadedDate) {
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if (newLoadedDate != null) {
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this.mem.put(LOADED_DATE, ASCII.getBytes(Long.toString(newLoadedDate.getTime())));
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}
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}
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protected Date getModDate() {
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if (this.mem.containsKey(MOD_DATE)) {
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return new Date(ByteArray.parseDecimal(this.mem.get(MOD_DATE)));
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}
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return null;
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}
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protected String getETag() {
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if (this.mem.containsKey(ETAG)) {
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return ASCII.String(this.mem.get(ETAG));
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}
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return null;
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}
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public int getCrawlDelayMillis() {
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if (this.mem.containsKey(CRAWL_DELAY_MILLIS)) try {
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return (int) ByteArray.parseDecimal(this.mem.get(CRAWL_DELAY_MILLIS));
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} catch (final NumberFormatException e) {
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return 0;
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}
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if (this.mem.containsKey(CRAWL_DELAY)) try {
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return 1000 * ((int) ByteArray.parseDecimal(this.mem.get(CRAWL_DELAY)));
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} catch (final NumberFormatException e) {
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return 0;
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}
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return 0;
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}
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public boolean isDisallowed(final MultiProtocolURL subpathURL) {
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String path = subpathURL.getFile();
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if (this.mem == null) {
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this.info = "no robots file available";
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return false;
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}
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if (this.denyPathList.isEmpty()) {
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this.info = "no entry in robots.txt";
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return false;
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}
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// if the path is null or empty we set it to /
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if (path == null || path.isEmpty()) path = "/";
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// escaping all occurences of ; because this char is used as special char in the Robots DB
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else path = RobotsTxt.ROBOTS_DB_PATH_SEPARATOR_MATCHER.matcher(path).replaceAll("%3B");
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for (final String element : this.denyPathList) {
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// disallow rule
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if (path.startsWith(element)) {
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this.info = "path '" + path + "' starts with '" + element + "' from deny path list = " + this.denyPathList.toString();
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return true;
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}
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}
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this.info = "path '" + path + "' does not start with any element from deny path list";
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return false;
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}
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public String getInfo() {
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return this.info;
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}
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} |