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