// getpageinfo_p // (C) 2011 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany // first published 11.11.2011 on http://yacy.net // // This is a part of YaCy, a peer-to-peer based web search engine // // $LastChangedDate$ // $LastChangedRevision$ // $LastChangedBy$ // // LICENSE // // 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 import java.io.IOException; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.Collection; import java.util.List; import java.util.Set; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import net.yacy.cora.document.id.AnchorURL; import net.yacy.cora.document.id.DigestURL; import net.yacy.cora.federate.yacy.CacheStrategy; import net.yacy.cora.protocol.ClientIdentification; import net.yacy.cora.protocol.RequestHeader; import net.yacy.cora.util.ConcurrentLog; import net.yacy.crawler.robots.RobotsTxtEntry; import net.yacy.repository.Blacklist.BlacklistType; import net.yacy.search.Switchboard; import net.yacy.server.serverObjects; import net.yacy.server.serverSwitch; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; public class getpageinfo { public static serverObjects respond(@SuppressWarnings("unused") final RequestHeader header, final serverObjects post, final serverSwitch env) { final Switchboard sb = (Switchboard) env; final serverObjects prop = new serverObjects(); // avoid UNRESOLVED PATTERN prop.put("title", ""); prop.put("desc", ""); prop.put("lang", ""); prop.put("robots-allowed", "3"); //unknown prop.put("robotsInfo", ""); //unknown prop.put("sitemap", ""); prop.put("favicon",""); prop.put("sitelist", ""); prop.put("filter", ".*"); prop.put("oai", 0); // default actions String actions = "title,robots"; if (post != null && post.containsKey("url")) { if (post.containsKey("actions")) actions=post.get("actions"); String url = post.get("url"); String agentName = post.get("agentName", ClientIdentification.yacyInternetCrawlerAgentName); ClientIdentification.Agent agent = ClientIdentification.getAgent(agentName); if (url.toLowerCase().startsWith("ftp://")) { prop.put("robots-allowed", "1"); // ok to crawl prop.put("robotsInfo", "ftp does not follow robots.txt"); prop.putXML("title", "FTP: " + url); return prop; } else if (!url.startsWith("http://") && !url.startsWith("https://") && !url.startsWith("ftp://") && !url.startsWith("smb://") && !url.startsWith("file://")) { url = "http://" + url; } if (actions.indexOf("title",0) >= 0) { DigestURL u = null; try { u = new DigestURL(url); } catch (final MalformedURLException e) { ConcurrentLog.logException(e); } net.yacy.document.Document scraper = null; if (u != null) try { scraper = sb.loader.loadDocument(u, CacheStrategy.IFEXIST, BlacklistType.CRAWLER, agent); } catch (final IOException e) { ConcurrentLog.logException(e); // bad things are possible, i.e. that the Server responds with "403 Bad Behavior" // that should not affect the robots.txt validity } if (scraper != null) { // put the document title prop.putXML("title", removelinebreaks(scraper.dc_title())); // put the favicon that belongs to the document prop.put("favicon", (scraper.getFavicon()==null) ? "" : scraper.getFavicon().toString()); // put keywords final String list[] = scraper.dc_subject(); int count = 0; for (final String element: list) { final String tag = element; if (!tag.equals("")) { prop.putXML("tags_"+count+"_tag", tag); count++; } } prop.put("tags", count); // put description prop.putXML("desc", removelinebreaks(scraper.dc_description().length > 0 ? scraper.dc_description()[0] : "")); // put language final Set languages = scraper.getContentLanguages(); prop.putXML("lang", (languages == null || languages.size() == 0) ? "unknown" : languages.iterator().next()); // get links and put them into a semicolon-separated list final Collection uris = scraper.getAnchors(); final StringBuilder links = new StringBuilder(uris.size() * 80); final StringBuilder filter = new StringBuilder(uris.size() * 40); count = 0; for (final DigestURL uri: uris) { if (uri == null) continue; links.append(';').append(uri.toNormalform(true)); filter.append('|').append(uri.getProtocol()).append("://").append(uri.getHost()).append(".*"); prop.putXML("links_" + count + "_link", uri.toNormalform(true)); count++; } prop.put("links", count); prop.putXML("sitelist", links.length() > 0 ? links.substring(1) : ""); prop.putXML("filter", filter.length() > 0 ? filter.substring(1) : ".*"); } } if (actions.indexOf("robots",0) >= 0) { try { final DigestURL theURL = new DigestURL(url); // determine if crawling of the current URL is allowed RobotsTxtEntry robotsEntry = sb.robots.getEntry(theURL, agent); prop.put("robots-allowed", robotsEntry == null ? 1 : robotsEntry.isDisallowed(theURL) ? 0 : 1); prop.putHTML("robotsInfo", robotsEntry == null ? "" : robotsEntry.getInfo()); // get the sitemap URL of the domain final List sitemaps = robotsEntry == null ? new ArrayList(0) : robotsEntry.getSitemaps(); for (int i = 0; i < sitemaps.size(); i++) { prop.putXML("sitemaps_" + i + "_sitemap", sitemaps.get(i)); } prop.put("sitemaps", sitemaps.size()); } catch (final MalformedURLException e) { ConcurrentLog.logException(e); } } if (actions.indexOf("oai",0) >= 0) { try { final DigestURL theURL = new DigestURL(url + "?verb=Identify"); final String oairesult = checkOAI(theURL.toString()); prop.put("oai", oairesult == "" ? 0 : 1); if (oairesult != "") { prop.putXML("title", oairesult); } } catch (final MalformedURLException e) { } } } // return rewrite properties return prop; } private static String removelinebreaks(String dc_title) { String newtitle = dc_title.replace ("\r", ""); newtitle = newtitle.replace ("\n", ""); newtitle = newtitle.replace ("\r\n", ""); return newtitle; } private static String checkOAI(final String url) { final DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); try { final DocumentBuilder builder = factory.newDocumentBuilder(); return parseXML(builder.parse(url)); } catch (final ParserConfigurationException ex) { ConcurrentLog.logException(ex); } catch (final SAXException ex) { ConcurrentLog.logException(ex); } catch (final IOException ex) { ConcurrentLog.logException(ex); } return ""; } private static String parseXML(final Document doc) { String repositoryName = null; final NodeList items = doc.getDocumentElement().getElementsByTagName( "Identify"); if (items.getLength() == 0) { return ""; } for (int i = 0, n = items.getLength(); i < n; ++i) { if (!"Identify".equals(items.item(i).getNodeName())) continue; final NodeList currentNodeChildren = items.item(i).getChildNodes(); for (int j = 0, m = currentNodeChildren.getLength(); j < m; ++j) { final Node currentNode = currentNodeChildren.item(j); if ("repositoryName".equals(currentNode.getNodeName())) { repositoryName = currentNode.getFirstChild().getNodeValue(); } } if (repositoryName == null) { return ""; } } return repositoryName; } }