yacy_search_server/htroot/yacysearch.java

// yacysearch.java
// -----------------------
// part of the AnomicHTTPD caching proxy
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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
//
// You must compile this file with
// javac -classpath .:../classes yacysearch.java
// if the shell's current path is HTROOT

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.TreeSet;

import net.yacy.cora.document.RSSMessage;
import net.yacy.cora.protocol.Domains;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.protocol.ResponseHeader;
import net.yacy.document.Condenser;
import net.yacy.document.Document;
import net.yacy.document.Parser;
import net.yacy.document.geolocalization.Location;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.data.meta.URIMetadataRow;
import net.yacy.kelondro.data.word.Word;
import net.yacy.kelondro.index.HandleSet;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.order.Bitfield;
import net.yacy.kelondro.util.EventTracker;
import net.yacy.kelondro.util.Formatter;
import net.yacy.kelondro.util.MemoryControl;
import net.yacy.kelondro.util.SetTools;
import net.yacy.kelondro.util.ISO639;

import de.anomic.crawler.CrawlProfile;
import de.anomic.data.DidYouMean;
import de.anomic.data.LibraryProvider;
import de.anomic.search.ContentDomain;
import de.anomic.search.QueryParams;
import de.anomic.search.RankingProfile;
import de.anomic.search.SearchEvent;
import de.anomic.search.SearchEventCache;
import de.anomic.search.Segment;
import de.anomic.search.Segments;
import de.anomic.search.Switchboard;
import de.anomic.search.SwitchboardConstants;
import de.anomic.server.serverCore;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.server.servletProperties;
import de.anomic.yacy.yacyNewsPool;
import de.anomic.yacy.graphics.ProfilingGraph;
import de.anomic.yacy.yacyChannel;

public class yacysearch {

    public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
        final Switchboard sb = (Switchboard) env;
        sb.localSearchLastAccess = System.currentTimeMillis();
        
        final boolean searchAllowed = sb.getConfigBool("publicSearchpage", true) || sb.verifyAuthentication(header, false);
        
        final boolean authenticated = sb.adminAuthenticated(header) >= 2;
        final boolean localhostAccess = sb.accessFromLocalhost(header);
        
        int display = (post == null) ? 0 : post.getInt("display", 0);
        if (!authenticated) display = 2;
        // display == 0: shop top menu
        // display == 1: show top and left menu
        // display == 2: do not show any menu
        final boolean browserPopUpTrigger = sb.getConfig(SwitchboardConstants.BROWSER_POP_UP_TRIGGER, "true").equals("true");
        if (browserPopUpTrigger) {
            final String  browserPopUpPage = sb.getConfig(SwitchboardConstants.BROWSER_POP_UP_PAGE, "ConfigBasic.html");
            if (browserPopUpPage.startsWith("index") || browserPopUpPage.startsWith("yacysearch")) display = 2;
        }
        String promoteSearchPageGreeting = env.getConfig(SwitchboardConstants.GREETING, "");
        if (env.getConfigBool(SwitchboardConstants.GREETING_NETWORK_NAME, false)) promoteSearchPageGreeting = env.getConfig("network.unit.description", "");
        final String client = header.get(HeaderFramework.CONNECTION_PROP_CLIENTIP); // the search client who initiated the search
        
        // get query
        String originalquerystring = (post == null) ? "" : post.get("query", post.get("search", "")).trim();
        String querystring =  originalquerystring.replace('+', ' ');
        CrawlProfile.CacheStrategy snippetFetchStrategy = (post == null) ? null : CrawlProfile.CacheStrategy.parse(post.get("verify", "cacheonly"));
        final servletProperties prop = new servletProperties();

        // get segment
        Segment indexSegment = null;
        if (post != null && post.containsKey("segment")) {
            String segmentName = post.get("segment");
            if (sb.indexSegments.segmentExist(segmentName)) {
                indexSegment = sb.indexSegments.segment(segmentName);
            }
        } else {
            // take default segment
            indexSegment = sb.indexSegments.segment(Segments.Process.PUBLIC);
        }
        
        final boolean rss = header.get("EXT", "").equals("rss");
        prop.put("promoteSearchPageGreeting", promoteSearchPageGreeting);
        prop.put("promoteSearchPageGreeting.homepage", sb.getConfig(SwitchboardConstants.GREETING_HOMEPAGE, ""));
        prop.put("promoteSearchPageGreeting.smallImage", sb.getConfig(SwitchboardConstants.GREETING_SMALL_IMAGE, ""));
        if (post == null || indexSegment == null || env == null || !searchAllowed) {
            // we create empty entries for template strings
            prop.put("searchagain", "0");
            prop.put("display", display);
            prop.put("former", "");
            prop.put("count", "10");
            prop.put("offset", "0");
            prop.put("resource", "global");
            prop.put("urlmaskfilter", (post == null) ? ".*" : post.get("urlmaskfilter", ".*"));
            prop.put("prefermaskfilter", (post == null) ? "" : post.get("prefermaskfilter", ""));
            prop.put("tenant", (post == null) ? "" : post.get("tenant", ""));
            prop.put("indexof", "off");
            prop.put("constraint", "");
            prop.put("cat", "href");
            prop.put("depth", "0");
            prop.put("verify", (post == null) ? "true" : post.get("verify", "true"));
            prop.put("contentdom", "text");
            prop.put("contentdomCheckText", "1");
            prop.put("contentdomCheckAudio", "0");
            prop.put("contentdomCheckVideo", "0");
            prop.put("contentdomCheckImage", "0");
            prop.put("contentdomCheckApp", "0");
            prop.put("excluded", "0");
            prop.put("results", "");
            prop.put("resultTable", "0");
            prop.put("num-results", searchAllowed ? "0" : "4");
            prop.put("num-results_totalcount", 0);
            prop.put("num-results_offset", 0);
            prop.put("num-results_itemsPerPage", 10);
            prop.put("geoinfo", "0");
            prop.put("rss_queryenc", "");
            prop.put("meanCount", 5);
            return prop;
        }
        
        // check for JSONP
        if (post.containsKey("callback")) {
        	final String jsonp = post.get("callback")+ "([";
        	prop.put("jsonp-start", jsonp);
        	prop.put("jsonp-end", "])");
        } else {
        	prop.put("jsonp-start", "");
        	prop.put("jsonp-end", "");
        }
        
        // Adding CORS Access header for yacysearch.rss output
        if (rss) {
            final ResponseHeader outgoingHeader = new ResponseHeader();
            outgoingHeader.put(HeaderFramework.CORS_ALLOW_ORIGIN, "*");
            prop.setOutgoingHeader(outgoingHeader);
        }
        
        // collect search attributes
        boolean newsearch = post.hasValue("query") && post.hasValue("former") && !post.get("query","").equalsIgnoreCase(post.get("former","")); //new search term
        
        int itemsPerPage = Math.min((authenticated) ? (snippetFetchStrategy != null && snippetFetchStrategy.isAllowedToFetchOnline() ? 100 : 1000) : (snippetFetchStrategy != null && snippetFetchStrategy.isAllowedToFetchOnline() ? 10 : 100), post.getInt("maximumRecords", post.getInt("count", 10))); // SRU syntax with old property as alternative
        int offset = (newsearch) ? 0 : post.getInt("startRecord", post.getInt("offset", 0));
        
        int newcount;
        if ( authenticated && (newcount = post.getInt("count", 0)) > 0 ) sb.setConfig(SwitchboardConstants.SEARCH_ITEMS, newcount); // set new default maximumRecords if search with "more options"
        
        boolean global = post.get("resource", "local").equals("global") && sb.peers.sizeConnected() > 0;
        final boolean indexof = (post != null && post.get("indexof","").equals("on")); 
        
        String urlmask = null;
        String originalUrlMask = null;
        if (post.containsKey("urlmask") && post.get("urlmask").equals("no")) { // option search all
            originalUrlMask = ".*";
        } else if (!newsearch && post.containsKey("urlmaskfilter")) {
            originalUrlMask = post.get("urlmaskfilter", ".*");
        } else {
            originalUrlMask = ".*";
        }

        String prefermask = (post == null) ? "" : post.get("prefermaskfilter", "");
        if (prefermask.length() > 0 && prefermask.indexOf(".*") < 0) prefermask = ".*" + prefermask + ".*";

        Bitfield constraint = (post != null && post.containsKey("constraint") && post.get("constraint", "").length() > 0) ? new Bitfield(4, post.get("constraint", "______")) : null;
        if (indexof) {
            constraint = new Bitfield(4);
            constraint.set(Condenser.flag_cat_indexof, true);
        }
        
        // SEARCH
        final boolean indexReceiveGranted = sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_ALLOW, true) ||
        									sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_AUTODISABLED, true);
        global = global && indexReceiveGranted; // if the user does not want indexes from remote peers, it cannot be a global search
        //final boolean offline = yacyCore.seedDB.mySeed().isVirgin();
        
        final boolean clustersearch = sb.isRobinsonMode() &&
    									(sb.getConfig("cluster.mode", "").equals("privatecluster") ||
    									 sb.getConfig("cluster.mode", "").equals("publiccluster"));
        //if (offline || !indexDistributeGranted || !indexReceiveGranted) { global = false; }
        if (clustersearch) global = true; // switches search on, but search target is limited to cluster nodes
        
        // increase search statistic counter
        if (!global) {
            // we count only searches on the local peer here, because global searches
            // are counted on the target peer to preserve privacy of the searcher
            if (authenticated) {
                // local or authenticated search requests are counted separately
                // because they are not part of a public available peer statistic
                sb.searchQueriesRobinsonFromLocal++;
            } else {
                // robinson-searches from non-authenticated requests are public
                // and may be part of the public available statistic
                sb.searchQueriesRobinsonFromRemote++;
            }
        }
        
        // find search domain
        final ContentDomain contentdom = ContentDomain.contentdomParser(post == null ? "text" : post.get("contentdom", "text"));
        
        // patch until better search profiles are available
        if ((contentdom != ContentDomain.TEXT) && (itemsPerPage <= 32)) itemsPerPage = 64;
        
        // check the search tracker
        TreeSet<Long> trackerHandles = sb.localSearchTracker.get(client);
        if (trackerHandles == null) trackerHandles = new TreeSet<Long>();
        boolean block = false;
        if (Domains.matchesList(client, sb.networkBlacklist)) {
            global = false;
            if (snippetFetchStrategy != null) snippetFetchStrategy = null;
            block = true;
            Log.logWarning("LOCAL_SEARCH", "ACCESS CONTROL: BLACKLISTED CLIENT FROM " + client + " gets no permission to search");
        } else if (Domains.matchesList(client, sb.networkWhitelist)) {
            Log.logInfo("LOCAL_SEARCH", "ACCESS CONTROL: WHITELISTED CLIENT FROM " + client + " gets no search restrictions");
        } else if (!authenticated && !localhostAccess) {
            // in case that we do a global search or we want to fetch snippets, we check for DoS cases
            synchronized (trackerHandles) {
                int accInOneSecond = trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 1000)).size();
                int accInThreeSeconds = trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 3000)).size();
                int accInOneMinute = trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 60000)).size();
                int accInTenMinutes = trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 600000)).size();
                // protections against too strong YaCy network load, reduces remote search
                if (global) {
                    if (accInTenMinutes >= 30 || accInOneMinute >= 6 || accInThreeSeconds >= 1) {
                        global = false;
                        Log.logWarning("LOCAL_SEARCH", "ACCESS CONTROL: CLIENT FROM " + client + ": " + accInOneSecond + "/1s, " + accInThreeSeconds + "/3s, " + accInOneMinute + "/60s, " + accInTenMinutes + "/600s, " + " requests, disallowed global search");
                    }
                }
                // protection against too many remote server snippet loads (protects traffic on server)
                if (snippetFetchStrategy != null && snippetFetchStrategy.isAllowedToFetchOnline()) {
                    if (accInTenMinutes >= 20 || accInOneMinute >= 4 || accInThreeSeconds >= 1) {
                        snippetFetchStrategy = null;
                        Log.logWarning("LOCAL_SEARCH", "ACCESS CONTROL: CLIENT FROM " + client + ": " + accInOneSecond + "/1s, " + accInThreeSeconds + "/3s, " + accInOneMinute + "/60s, " + accInTenMinutes + "/600s, " + " requests, disallowed remote snippet loading");
                    }
                }
                // general load protection
                if (accInTenMinutes >= 2000 || accInOneMinute >= 600 || accInOneSecond >= 20) {
                    block = true;
                    Log.logWarning("LOCAL_SEARCH", "ACCESS CONTROL: CLIENT FROM " + client + ": " + accInOneSecond + "/1s, " + accInThreeSeconds + "/3s, " + accInOneMinute + "/60s, " + accInTenMinutes + "/600s, " + " requests, disallowed search");
                }
            }
        }
        
        if ((!block) && (post == null || post.get("cat", "href").equals("href"))) {
            
            // check available memory and clean up if necessary
            if (!MemoryControl.request(8000000L, false)) {
                indexSegment.urlMetadata().clearCache();
                SearchEventCache.cleanupEvents(true);
            }
            
            final RankingProfile ranking = sb.getRanking();

            if (querystring.indexOf("NEAR") >= 0) {
            	querystring = querystring.replace("NEAR", "");
            	ranking.coeff_worddistance = RankingProfile.COEFF_MAX;
            }
            if (querystring.indexOf("RECENT") >= 0) {
            	querystring = querystring.replace("RECENT", "");
                ranking.coeff_date = RankingProfile.COEFF_MAX;
            }
            int lrp = querystring.indexOf("LANGUAGE:");
            String lr = "";
            if (lrp >= 0) {
                if (querystring.length() >= (lrp + 11))
                	lr = querystring.substring(lrp + 9, lrp + 11);
                querystring = querystring.replace("LANGUAGE:" + lr, "");
                lr = lr.toLowerCase();
            }
            int inurl = querystring.indexOf("inurl:");
            if (inurl >= 0) {
                int ftb = querystring.indexOf(' ', inurl);
                if (ftb == -1) ftb = querystring.length();
                String urlstr = querystring.substring(inurl + 6, ftb);
                querystring = querystring.replace("inurl:" + urlstr, "");
                if(urlstr.length() > 0) urlmask = ".*" + urlstr + ".*";
            }
            int filetype = querystring.indexOf("filetype:");
            if (filetype >= 0) {
                int ftb = querystring.indexOf(' ', filetype);
                if (ftb == -1) ftb = querystring.length();
                String ft = querystring.substring(filetype + 9, ftb);
                querystring = querystring.replace("filetype:" + ft, "");
                while (ft.length() > 0 && ft.charAt(0) == '.') ft = ft.substring(1);
                if(ft.length() > 0) {
                    if (urlmask == null) {
                        urlmask = ".*\\." + ft;
                    } else {
                        urlmask = urlmask + ".*\\." + ft;
                    }
                }
            }
            String tenant = null;
            if (post.containsKey("tenant")) {
                tenant = post.get("tenant");
                if (tenant != null && tenant.length() == 0) tenant = null;
                if (tenant != null) {
                	if (urlmask == null) urlmask = ".*" + tenant + ".*"; else urlmask = ".*" + tenant + urlmask;
                }
            }
            int site = querystring.indexOf("site:");
            String sitehash = null;
            String sitehost = null;
            if (site >= 0) {
                int ftb = querystring.indexOf(' ', site);
                if (ftb == -1) ftb = querystring.length();
                sitehost = querystring.substring(site + 5, ftb);
                querystring = querystring.replace("site:" + sitehost, "");
                while (sitehost.length() > 0 && sitehost.charAt(0) == '.') sitehost = sitehost.substring(1);
                while (sitehost.endsWith(".")) sitehost = sitehost.substring(0, sitehost.length() - 1);
                sitehash = DigestURI.domhash(sitehost);
            }
            
            int heuristic = querystring.indexOf("heuristic:scroogle");
            if (heuristic >= 0) {
                querystring = querystring.replace("heuristic:scroogle", "");
            }
            
            int authori = querystring.indexOf("author:");
        	String authorhash = null;
            if (authori >= 0) {
            	// check if the author was given with single quotes or without
            	boolean quotes = false;
            	if (querystring.charAt(authori + 7) == (char) 39) {
            		quotes = true;
            	}
            	String author;
            	if (quotes) {
            		int ftb = querystring.indexOf((char) 39, authori + 8);
                    if (ftb == -1) ftb = querystring.length() + 1;
                    author = querystring.substring(authori + 8, ftb);
                    querystring = querystring.replace("author:'" + author + "'", "");
            	} else {
            		int ftb = querystring.indexOf(' ', authori);
            		if (ftb == -1) ftb = querystring.length();
            		author = querystring.substring(authori + 7, ftb);
                    querystring = querystring.replace("author:" + author, "");
            	}
            	authorhash = new String(Word.word2hash(author));
            }
            int tld = querystring.indexOf("tld:");
            if (tld >= 0) {
                int ftb = querystring.indexOf(' ', tld);
                if (ftb == -1) ftb = querystring.length();
                String domain = querystring.substring(tld + 4, ftb);
                querystring = querystring.replace("tld:" + domain, "");
                while (domain.length() > 0 && domain.charAt(0) == '.') domain = domain.substring(1);
                if (domain.indexOf('.') < 0) domain = "\\." + domain; // is tld
                if (domain.length() > 0) {
                    if (urlmask == null) {
                        urlmask = "[a-zA-Z]*://[^/]*" + domain + "/.*";
                    } else {
                        urlmask = "[a-zA-Z]*://[^/]*" + domain + "/.*" + urlmask;
                    }
                }
            }
            if (urlmask == null || urlmask.length() == 0) urlmask = originalUrlMask; //if no urlmask was given
           
            // read the language from the language-restrict option 'lr'
            // if no one is given, use the user agent or the system language as default
            String language = (post == null) ? lr : post.get("lr", lr);
            if (language.startsWith("lang_")) language = language.substring(5);
            if (!ISO639.exists(language)) {
                // find out language of the user by reading of the user-agent string
                String agent = header.get(HeaderFramework.ACCEPT_LANGUAGE);
                if (agent == null) agent = System.getProperty("user.language");
                language = (agent == null) ? "en" : ISO639.userAgentLanguageDetection(agent);
                if (language == null) language = "en";
            }
            
            // navigation
            String navigation = (post == null) ? "" : post.get("nav", "");
            
            // the query
            final TreeSet<String>[] query = QueryParams.cleanQuery(querystring.trim()); // converts also umlaute
            
            int maxDistance = (querystring.indexOf('"') >= 0) ? maxDistance = query.length - 1 : Integer.MAX_VALUE;

            // filter out stopwords
            final TreeSet<String> filtered = SetTools.joinConstructive(query[0], Switchboard.stopwords);
            if (!filtered.isEmpty()) {
                SetTools.excludeDestructive(query[0], Switchboard.stopwords);
            }

            // if a minus-button was hit, remove a special reference first
            if (post != null && post.containsKey("deleteref")) try {
                if (!sb.verifyAuthentication(header, true)) {
                    prop.put("AUTHENTICATE", "admin log-in"); // force log-in
                    return prop;
                }
                
                // delete the index entry locally
                final String delHash = post.get("deleteref", ""); // urlhash
                indexSegment.termIndex().remove(Word.words2hashesHandles(query[0]), delHash.getBytes());

                // make new news message with negative voting
                final HashMap<String, String> map = new HashMap<String, String>();
                map.put("urlhash", delHash);
                map.put("vote", "negative");
                map.put("refid", "");
                sb.peers.newsPool.publishMyNews(sb.peers.mySeed(), yacyNewsPool.CATEGORY_SURFTIPP_VOTE_ADD, map);
            } catch (IOException e) {
                Log.logException(e);
            }

            // if a plus-button was hit, create new voting message
            if (post != null && post.containsKey("recommendref")) {
                if (!sb.verifyAuthentication(header, true)) {
                    prop.put("AUTHENTICATE", "admin log-in"); // force log-in
                    return prop;
                }
                final String recommendHash = post.get("recommendref", ""); // urlhash
                final URIMetadataRow urlentry = indexSegment.urlMetadata().load(recommendHash.getBytes(), null, 0);
                if (urlentry != null) {
                    final URIMetadataRow.Components metadata = urlentry.metadata();
                    Document[] documents = null;
                    try {
                        documents = sb.loader.loadDocuments(sb.loader.request(metadata.url(), true, false), CrawlProfile.CacheStrategy.IFEXIST, 5000, Long.MAX_VALUE);
                    } catch (IOException e) {
                    } catch (Parser.Failure e) {
                    }
                    if (documents != null) {
                        // create a news message
                        final HashMap<String, String> map = new HashMap<String, String>();
                        map.put("url", metadata.url().toNormalform(false, true).replace(',', '|'));
                        map.put("title", metadata.dc_title().replace(',', ' '));
                        map.put("description", documents[0].dc_title().replace(',', ' '));
                        map.put("author", documents[0].dc_creator());
                        map.put("tags", documents[0].dc_subject(' '));
                        sb.peers.newsPool.publishMyNews(sb.peers.mySeed(), yacyNewsPool.CATEGORY_SURFTIPP_ADD, map);
                        documents[0].close();
                    }
                }
            }

            // prepare search properties
            //final boolean yacyonline = ((sb.webIndex.seedDB != null) && (sb.webIndex.seedDB.mySeed() != null) && (sb.webIndex.seedDB.mySeed().getPublicAddress() != null));
            final boolean globalsearch = (global) && indexReceiveGranted; /* && (yacyonline)*/ 
        
            // do the search
            final HandleSet queryHashes = Word.words2hashesHandles(query[0]);
            final QueryParams theQuery = new QueryParams(
        			originalquerystring,
        			queryHashes,
        			Word.words2hashesHandles(query[1]),
        			Word.words2hashesHandles(query[2]),
        			tenant,
                    maxDistance,
                    prefermask,
                    contentdom,
                    language,
                    navigation,
                    snippetFetchStrategy,
                    itemsPerPage,
                    offset,
                    urlmask,
                    (clustersearch && globalsearch) ? QueryParams.SEARCHDOM_CLUSTERALL :
                    ((globalsearch) ? QueryParams.SEARCHDOM_GLOBALDHT : QueryParams.SEARCHDOM_LOCAL),
                    20,
                    constraint,
                    true,
                    sitehash,
                    authorhash,
                    DigestURI.TLD_any_zone_filter,
                    client,
                    authenticated,
                    indexSegment,
                    ranking,
                    header.get(RequestHeader.USER_AGENT, ""));
            EventTracker.delete(EventTracker.EClass.SEARCH);
            EventTracker.update(EventTracker.EClass.SEARCH, new ProfilingGraph.searchEvent(theQuery.id(true), SearchEvent.Type.INITIALIZATION, "", 0, 0), false);
            
            // tell all threads to do nothing for a specific time
            sb.intermissionAllThreads(3000);
        
            // filter out words that appear in bluelist
            theQuery.filterOut(Switchboard.blueList);
            
            // log
            Log.logInfo("LOCAL_SEARCH", "INIT WORD SEARCH: " + theQuery.queryString + ":" + QueryParams.hashSet2hashString(theQuery.queryHashes) + " - " + theQuery.neededResults() + " links to be computed, " + theQuery.displayResults() + " lines to be displayed");
            yacyChannel.channels(yacyChannel.LOCALSEARCH).addMessage(new RSSMessage("Local Search Request", theQuery.queryString, ""));
            final long timestamp = System.currentTimeMillis();

            // create a new search event
            if (SearchEventCache.getEvent(theQuery.id(false)) == null) {
                theQuery.setOffset(0); // in case that this is a new search, always start without a offset 
                offset = 0;
            }
            final SearchEvent theSearch = SearchEventCache.getEvent(theQuery, sb.peers, sb.crawlResults, (sb.isRobinsonMode()) ? sb.clusterhashes : null, false, sb.loader);
            try {Thread.sleep(global ? 100 : 10);} catch (InterruptedException e1) {} // wait a little time to get first results in the search
            
            if (sitehost != null && sb.getConfigBool("heuristic.site", false) && authenticated) sb.heuristicSite(theSearch, sitehost);
            if ((heuristic >= 0  || sb.getConfigBool("heuristic.scroogle", false)) && authenticated) sb.heuristicScroogle(theSearch);
            
            // generate result object
            //serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER ORDERING OF SEARCH RESULTS: " + (System.currentTimeMillis() - timestamp) + " ms");
            //serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER RESULT PREPARATION: " + (System.currentTimeMillis() - timestamp) + " ms");
                
            // calc some more cross-reference
            //serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER XREF PREPARATION: " + (System.currentTimeMillis() - timestamp) + " ms");

            // log
            Log.logInfo("LOCAL_SEARCH", "EXIT WORD SEARCH: " + theQuery.queryString + " - " +
                    (theSearch.getRankingResult().getLocalIndexCount() + theSearch.getRankingResult().getRemoteResourceSize()) + " links found, " +
                    (System.currentTimeMillis() - timestamp) + " ms");

            // prepare search statistics
            theQuery.resultcount = theSearch.getRankingResult().getLocalIndexCount() + theSearch.getRankingResult().getRemoteResourceSize();
            theQuery.searchtime = System.currentTimeMillis() - timestamp;
            theQuery.urlretrievaltime = theSearch.result().getURLRetrievalTime();
            theQuery.snippetcomputationtime = theSearch.result().getSnippetComputationTime();
            sb.localSearches.add(theQuery);
                        
            // check suggestions
            int meanMax = 0;
            if (post != null && post.containsKey("meanCount")) {
            	try {
            	    meanMax = Integer.parseInt(post.get("meanCount"));            	
            	} catch (NumberFormatException e) {}
            }
            prop.put("meanCount", meanMax);
            if (meanMax > 0) {
                DidYouMean didYouMean = new DidYouMean(indexSegment.termIndex(), querystring);
            	Iterator<String> meanIt = didYouMean.getSuggestions(100, 5).iterator();
                int meanCount = 0;
                String suggestion;
                while(meanCount<meanMax && meanIt.hasNext()) {
                	suggestion = meanIt.next();
                	prop.put("didYouMean_suggestions_"+meanCount+"_word", suggestion);
                	prop.put("didYouMean_suggestions_"+meanCount+"_url",
                	    QueryParams.navurl("html", 0, display, theQuery, suggestion, originalUrlMask.toString(), theQuery.navigators)
    	             );
                	prop.put("didYouMean_suggestions_"+meanCount+"_sep","|");
                	meanCount++;
                }
                prop.put("didYouMean_suggestions_"+(meanCount-1)+"_sep","");
                prop.put("didYouMean", meanCount>0 ? 1:0);
                prop.put("didYouMean_suggestions", meanCount);
            } else {
                prop.put("didYouMean", 0);
            }
            
            // find geographic info
            TreeSet<Location> coordinates = LibraryProvider.geoLoc.find(originalquerystring, false);
            if (coordinates == null || coordinates.isEmpty() || offset > 0) {
                prop.put("geoinfo", "0");
            } else {
                int i = 0;
                for (Location c: coordinates) {
                    prop.put("geoinfo_loc_" + i + "_lon", Math.round(c.lon() * 10000.0) / 10000.0);
                    prop.put("geoinfo_loc_" + i + "_lat", Math.round(c.lat() * 10000.0) / 10000.0);
                    prop.put("geoinfo_loc_" + i + "_name", c.getName());
                    i++;
                    if (i >= 10) break;
                }
                prop.put("geoinfo_loc", i);
                prop.put("geoinfo", "1");
            }
            
            // update the search tracker
            try {
                synchronized (trackerHandles) {
                	trackerHandles.add(theQuery.handle);
                	while (trackerHandles.size() > 600) if (!trackerHandles.remove(trackerHandles.first())) break;
                }
                sb.localSearchTracker.put(client, trackerHandles);
            	if (sb.localSearchTracker.size() > 1000) sb.localSearchTracker.remove(sb.localSearchTracker.keys().nextElement());
            } catch (Exception e) {
                Log.logException(e);
            }
            
            prop.put("num-results_offset", offset);
            prop.put("num-results_itemscount", Formatter.number(0, true));
            prop.put("num-results_itemsPerPage", itemsPerPage);
            prop.put("num-results_totalcount", Formatter.number(theSearch.getRankingResult().getLocalIndexCount() + theSearch.getRankingResult().getRemoteResourceSize(), true));
            prop.put("num-results_globalresults", (globalsearch) ? "1" : "0");
            prop.put("num-results_globalresults_localResourceSize", Formatter.number(theSearch.getRankingResult().getLocalIndexCount(), true));
            prop.put("num-results_globalresults_remoteResourceSize", Formatter.number(theSearch.getRankingResult().getRemoteResourceSize(), true));
            prop.put("num-results_globalresults_remoteIndexCount", Formatter.number(theSearch.getRankingResult().getRemoteIndexCount(), true));
            prop.put("num-results_globalresults_remotePeerCount", Formatter.number(theSearch.getRankingResult().getRemotePeerCount(), true));
            
            // compose page navigation
            final StringBuilder resnav = new StringBuilder();
            final int thispage = offset / theQuery.displayResults();
            if (thispage == 0) {
            	resnav.append("<img src=\"env/grafics/navdl.gif\" alt=\"arrowleft\" width=\"16\" height=\"16\" />&nbsp;");
            } else {
            	resnav.append("<a id=\"prevpage\" href=\"");
                resnav.append(QueryParams.navurl("html", thispage - 1, display, theQuery, null, originalUrlMask, navigation));
            	resnav.append("\"><img src=\"env/grafics/navdl.gif\" alt=\"arrowleft\" width=\"16\" height=\"16\" /></a>&nbsp;");
            }
            final int numberofpages = Math.min(10, Math.max(1 + thispage, 1 + ((theSearch.getRankingResult().getLocalIndexCount() < 11) ? Math.max(30, theSearch.getRankingResult().getLocalResourceSize() + theSearch.getRankingResult().getRemoteResourceSize()) : theSearch.getRankingResult().getLocalIndexCount()) / theQuery.displayResults()));
            for (int i = 0; i < numberofpages; i++) {
                if (i == thispage) {
                    resnav.append("<img src=\"env/grafics/navs");
                    resnav.append(i + 1);
                    resnav.append(".gif\" alt=\"page");
					resnav.append(i + 1);
					resnav.append("\" width=\"16\" height=\"16\" />&nbsp;");
                } else {
                    resnav.append("<a href=\"");
                    resnav.append(QueryParams.navurl("html", i, display, theQuery, null, originalUrlMask, navigation));
                    resnav.append("\"><img src=\"env/grafics/navd");
                	resnav.append(i + 1);
                	resnav.append(".gif\" alt=\"page");
					resnav.append(i + 1);
					resnav.append("\" width=\"16\" height=\"16\" /></a>&nbsp;");
                }
            }
            if (thispage >= numberofpages) {
            	resnav.append("<img src=\"env/grafics/navdr.gif\" alt=\"arrowright\" width=\"16\" height=\"16\" />");
            } else {
                resnav.append("<a id=\"nextpage\" href=\"");
                resnav.append(QueryParams.navurl("html", thispage + 1, display, theQuery, null, originalUrlMask, navigation));
                resnav.append("\"><img src=\"env/grafics/navdr.gif\" alt=\"arrowright\" width=\"16\" height=\"16\" /></a>");
            }
            String resnavs = resnav.toString();
            prop.put("num-results_resnav", resnavs);
            prop.put("pageNavBottom", (theSearch.getRankingResult().getLocalIndexCount() - offset > 6) ? 1 : 0); // if there are more results than may fit on the page we add a navigation at the bottom
            prop.put("pageNavBottom_resnav", resnavs);
        
            // generate the search result lines; the content will be produced by another servlet
            for (int i = 0; i < theQuery.displayResults(); i++) {
                prop.put("results_" + i + "_item", offset + i);
                prop.put("results_" + i + "_eventID", theQuery.id(false));
                prop.put("results_" + i + "_display", display);
            }
            prop.put("results", theQuery.displayResults());
            prop.put("resultTable", (contentdom == ContentDomain.APP || contentdom == ContentDomain.AUDIO || contentdom == ContentDomain.VIDEO) ? 1 : 0);
            prop.put("eventID", theQuery.id(false)); // for bottomline
            
            // process result of search
            if (!filtered.isEmpty()) {
                prop.put("excluded", "1");
                prop.putHTML("excluded_stopwords", filtered.toString());
            } else {
                prop.put("excluded", "0");
            }

            if (prop == null || prop.isEmpty()) {
                if (post == null || post.get("query", post.get("search", "")).length() < 3) {
                    prop.put("num-results", "2"); // no results - at least 3 chars
                } else {
                    prop.put("num-results", "1"); // no results
                }
            } else {
                prop.put("num-results", "3");
            }

            prop.put("cat", "href");
            prop.put("depth", "0");

            // adding some additional properties needed for the rss feed
            String hostName = header.get("Host", "localhost");
            if (hostName.indexOf(':') == -1) hostName += ":" + serverCore.getPortNr(env.getConfig("port", "8080"));
            prop.put("searchBaseURL", "http://" + hostName + "/yacysearch.html");
            prop.put("rssYacyImageURL", "http://" + hostName + "/env/grafics/yacy.gif");
        }
        
        prop.put("searchagain", global ? "1" : "0");
        prop.put("display", display);
        prop.putHTML("former", originalquerystring);
        prop.put("count", itemsPerPage);
        prop.put("offset", offset);
        prop.put("resource", global ? "global" : "local");
        prop.putHTML("urlmaskfilter", originalUrlMask);
        prop.putHTML("prefermaskfilter", prefermask);
        prop.put("indexof", (indexof) ? "on" : "off");
        prop.put("constraint", (constraint == null) ? "" : constraint.exportB64());
        prop.put("verify", snippetFetchStrategy == null ? "false" : snippetFetchStrategy.toName());
        prop.put("contentdom", (post == null ? "text" : post.get("contentdom", "text")));
        prop.put("searchdomswitches", sb.getConfigBool("search.text", true) || sb.getConfigBool("search.audio", true) || sb.getConfigBool("search.video", true) || sb.getConfigBool("search.image", true) || sb.getConfigBool("search.app", true) ? 1 : 0);
        prop.put("searchdomswitches_searchtext", sb.getConfigBool("search.text", true) ? 1 : 0);
        prop.put("searchdomswitches_searchaudio", sb.getConfigBool("search.audio", true) ? 1 : 0);
        prop.put("searchdomswitches_searchvideo", sb.getConfigBool("search.video", true) ? 1 : 0);
        prop.put("searchdomswitches_searchimage", sb.getConfigBool("search.image", true) ? 1 : 0);
        prop.put("searchdomswitches_searchapp", sb.getConfigBool("search.app", true) ? 1 : 0);
        prop.put("searchdomswitches_searchtext_check", (contentdom == ContentDomain.TEXT) ? "1" : "0");
        prop.put("searchdomswitches_searchaudio_check", (contentdom == ContentDomain.AUDIO) ? "1" : "0");
        prop.put("searchdomswitches_searchvideo_check", (contentdom == ContentDomain.VIDEO) ? "1" : "0");
        prop.put("searchdomswitches_searchimage_check", (contentdom == ContentDomain.IMAGE) ? "1" : "0");
        prop.put("searchdomswitches_searchapp_check", (contentdom == ContentDomain.APP) ? "1" : "0");

        // copy properties for "more options" link
        prop.put("searchdomswitches_display", prop.get("display"));
        prop.put("searchdomswitches_count", prop.get("count"));
        prop.put("searchdomswitches_urlmaskfilter", prop.get("urlmaskfilter"));
        prop.put("searchdomswitches_prefermaskfilter", prop.get("prefermaskfilter"));
        prop.put("searchdomswitches_cat", prop.get("cat"));
        prop.put("searchdomswitches_constraint", prop.get("constraint"));
        prop.put("searchdomswitches_contentdom", prop.get("contentdom"));
        prop.put("searchdomswitches_former", prop.get("former"));
        prop.put("searchdomswitches_meanCount", prop.get("meanCount"));

        // for RSS: don't HTML encode some elements
        prop.putXML("rss_query", originalquerystring);
        prop.putXML("rss_queryenc", originalquerystring.replace(' ', '+'));
                
        sb.localSearchLastAccess = System.currentTimeMillis();
        
        // return rewrite properties
        return prop;
    }
}