1 /*
2 * Title: RobotDecoratorMapper
3 * Description:
4 *
5 * This software is published under the terms of the OpenSymphony Software
6 * License version 1.1, of which a copy has been included with this
7 * distribution in the LICENSE.txt file.
8 */
9
10 package com.opensymphony.module.sitemesh.mapper;
11
12 import com.opensymphony.module.sitemesh.Config;
13 import com.opensymphony.module.sitemesh.Decorator;
14 import com.opensymphony.module.sitemesh.DecoratorMapper;
15 import com.opensymphony.module.sitemesh.Page;
16 import com.opensymphony.module.sitemesh.RequestConstants;
17
18 import javax.servlet.http.HttpServletRequest;
19 import javax.servlet.http.HttpSession;
20 import java.util.Properties;
21
22 /**
23 * The RobotDecoratorMapper will use the specified decorator when the requester
24 * is identified as a robot (also known as spider, crawler, ferret) of a search engine.
25 *
26 * <p>The name of this decorator should be supplied in the <code>decorator</code>
27 * property.</p>
28 *
29 * @author <a href="mailto:pathos@pandora.be">Mathias Bogaert</a>
30 * @version $Revision: 1.2 $
31 *
32 * @see com.opensymphony.module.sitemesh.DecoratorMapper
33 */
34 public final class RobotDecoratorMapper extends AbstractDecoratorMapper {
35 private String decoratorName = null;
36
37 /** All known robot hosts (list can be found <a href="http://www.spiderhunter.com">here</a>). */
38 private static final String[] botHosts = {"alltheweb.com", "alta-vista.net", "altavista.com",
39 "atext.com", "euroseek.net", "excite.com",
40 "fast-search.net", "google.com", "googlebot.com",
41 "infoseek.co.jp", "infoseek.com", "inktomi.com",
42 "inktomisearch.com", "linuxtoday.com.au", "lycos.com",
43 "lycos.com", "northernlight.com", "pa-x.dec.com"};
44
45 /**
46 * All known robot user-agent headers (list can be found
47 * <a href="http://www.robotstxt.org/wc/active.html">here</a>).
48 *
49 * <p>NOTE: To avoid bad detection:</p>
50 *
51 * <ul>
52 * <li>Robots with ID of 2 letters only were removed</li>
53 * <li>Robot called "webs" were removed</li>
54 * <li>directhit was changed in direct_hit (its real id)</li>
55 * </ul>
56 */
57 private static final String[] botAgents = {
58 "acme.spider", "ahoythehomepagefinder", "alkaline", "appie", "arachnophilia",
59 "architext", "aretha", "ariadne", "aspider", "atn.txt", "atomz", "auresys",
60 "backrub", "bigbrother", "bjaaland", "blackwidow", "blindekuh", "bloodhound",
61 "brightnet", "bspider", "cactvschemistryspider", "calif", "cassandra",
62 "cgireader", "checkbot", "churl", "cmc", "collective", "combine", "conceptbot",
63 "core", "cshkust", "cusco", "cyberspyder", "deweb", "dienstspider", "diibot",
64 "direct_hit", "dnabot", "download_express", "dragonbot", "dwcp", "ebiness",
65 "eit", "emacs", "emcspider", "esther", "evliyacelebi", "fdse", "felix",
66 "ferret", "fetchrover", "fido", "finnish", "fireball", "fish", "fouineur",
67 "francoroute", "freecrawl", "funnelweb", "gazz", "gcreep", "getbot", "geturl",
68 "golem", "googlebot", "grapnel", "griffon", "gromit", "gulliver", "hambot",
69 "harvest", "havindex", "hometown", "wired-digital", "htdig", "htmlgobble",
70 "hyperdecontextualizer", "ibm", "iconoclast", "ilse", "imagelock", "incywincy",
71 "informant", "infoseek", "infoseeksidewinder", "infospider", "inspectorwww",
72 "intelliagent", "iron33", "israelisearch", "javabee", "jcrawler", "jeeves",
73 "jobot", "joebot", "jubii", "jumpstation", "katipo", "kdd", "kilroy",
74 "ko_yappo_robot", "labelgrabber.txt", "larbin", "legs", "linkscan",
75 "linkwalker", "lockon", "logo_gif", "lycos", "macworm", "magpie", "mediafox",
76 "merzscope", "meshexplorer", "mindcrawler", "moget", "momspider", "monster",
77 "motor", "muscatferret", "mwdsearch", "myweb", "netcarta", "netmechanic",
78 "netscoop", "newscan-online", "nhse", "nomad", "northstar", "nzexplorer",
79 "occam", "octopus", "orb_search", "packrat", "pageboy", "parasite", "patric",
80 "perignator", "perlcrawler", "phantom", "piltdownman", "pioneer", "pitkow",
81 "pjspider", "pka", "plumtreewebaccessor", "poppi", "portalb", "puu", "python",
82 "raven", "rbse", "resumerobot", "rhcs", "roadrunner", "robbie", "robi",
83 "roverbot", "safetynetrobot", "scooter", "search_au", "searchprocess",
84 "senrigan", "sgscout", "shaggy", "shaihulud", "sift", "simbot", "site-valet",
85 "sitegrabber", "sitetech", "slurp", "smartspider", "snooper", "solbot",
86 "spanner", "speedy", "spider_monkey", "spiderbot", "spiderman", "spry",
87 "ssearcher", "suke", "sven", "tach_bw", "tarantula", "tarspider", "tcl",
88 "techbot", "templeton", "titin", "titan", "tkwww", "tlspider", "ucsd",
89 "udmsearch", "urlck", "valkyrie", "victoria", "visionsearch", "voyager",
90 "vwbot", "w3index", "w3m2", "wanderer", "webbandit", "webcatcher", "webcopy",
91 "webfetcher", "webfoot", "weblayers", "weblinker", "webmirror", "webmoose",
92 "webquest", "webreader", "webreaper", "websnarf", "webspider", "webvac",
93 "webwalk", "webwalker", "webwatch", "wget", "whowhere", "wmir", "wolp",
94 "wombat", "worm", "wwwc", "wz101", "xget", "nederland.zoek"
95 };
96
97 public void init(Config config, Properties properties, DecoratorMapper parent) throws InstantiationException {
98 super.init(config, properties, parent);
99 decoratorName = properties.getProperty("decorator");
100 }
101
102 public Decorator getDecorator(HttpServletRequest request, Page page) {
103 Decorator result = null;
104
105 if (decoratorName != null && isBot(request)) {
106 result = getNamedDecorator(request, decoratorName);
107 }
108
109 return result == null ? super.getDecorator(request, page) : result;
110 }
111
112 /** Check if the current request came from a robot (also known as spider, crawler, ferret) */
113 private static boolean isBot(HttpServletRequest request) {
114 if (request == null) return false;
115
116 // force creation of a session
117 HttpSession session = request.getSession(true);
118
119 if (Boolean.FALSE.equals(session.getAttribute(RequestConstants.ROBOT))) {
120 return false;
121 }
122 else if (Boolean.TRUE.equals(session.getAttribute(RequestConstants.ROBOT))) {
123 // a key was found in the session indicating it is a robot
124 return true;
125 }
126 else {
127 if ("robots.txt".indexOf(request.getRequestURI()) != -1) {
128 // there is a specific request for the robots.txt file, so we assume
129 // it must be a robot (only robots request robots.txt)
130
131 // set a key in the session, so the next time we don't have to manually
132 // detect the robot again
133 session.setAttribute(RequestConstants.ROBOT, Boolean.TRUE);
134 return true;
135 }
136 else {
137 String userAgent = request.getHeader("User-Agent");
138
139 if (userAgent != null && userAgent.trim().length() > 2) {
140 // first check for common user-agent headers, so that we can speed
141 // this thing up, hopefully clever spiders will not send a fake header
142 if (userAgent.indexOf("MSIE") != -1 || userAgent.indexOf("Gecko") != -1 // MSIE and Mozilla
143 || userAgent.indexOf("Opera") != -1 || userAgent.indexOf("iCab") != -1 // Opera and iCab (mac browser)
144 || userAgent.indexOf("Konqueror") != -1 || userAgent.indexOf("KMeleon") != -1 // Konqueror and KMeleon
145 || userAgent.indexOf("4.7") != -1 || userAgent.indexOf("Lynx") != -1) { // NS 4.78 and Lynx
146 // indicate this session is not a robot
147 session.setAttribute(RequestConstants.ROBOT, Boolean.FALSE);
148 return false;
149 }
150
151 for (int i = 0; i < botAgents.length; i++) {
152 if (userAgent.indexOf(botAgents[i]) != -1) {
153 // set a key in the session, so the next time we don't have to manually
154 // detect the robot again
155 session.setAttribute(RequestConstants.ROBOT, Boolean.TRUE);
156 return true;
157 }
158 }
159 }
160
161 // detect the robot from the host or user-agent
162 String remoteHost = request.getRemoteHost(); // requires one DNS lookup
163
164 // if the DNS server didn't return a hostname, getRemoteHost returns the
165 // IP address, which is ignored here (the last char is checked, because some
166 // remote hosts begin with the IP)
167 if (remoteHost != null && remoteHost.length() > 0 && remoteHost.charAt(remoteHost.length() - 1) > 64) {
168 for (int i = 0; i < botHosts.length; i++) {
169 if (remoteHost.indexOf(botHosts[i]) != -1) {
170 // set a key in the session, so the next time we don't have to manually
171 // detect the robot again
172 session.setAttribute(RequestConstants.ROBOT, Boolean.TRUE);
173 return true;
174 }
175 }
176 }
177
178 // remote host and user agent are not in the predefined list,
179 // so it must be an unknown robot or not a robot
180
181 // indicate this session is not a robot
182 session.setAttribute(RequestConstants.ROBOT, Boolean.FALSE);
183 return false;
184 }
185 }
186 }
187 }
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