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418 lines
18 KiB
418 lines
18 KiB
//ViewFile.java
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//-----------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2004
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//last major change: 12.07.2004
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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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//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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//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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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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//you must compile this file with
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//javac -classpath .:../Classes Status.java
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//if the shell's current path is HTROOT
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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import java.net.MalformedURLException;
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import java.net.URLDecoder;
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import java.net.URLEncoder;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeSet;
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import de.anomic.data.wikiCode;
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import de.anomic.htmlFilter.htmlFilterImageEntry;
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import de.anomic.http.httpHeader;
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import de.anomic.http.httpc;
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import de.anomic.index.indexURLEntry;
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import de.anomic.net.URL;
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import de.anomic.plasma.plasmaCondenser;
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import de.anomic.plasma.plasmaHTCache;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.cache.IResourceInfo;
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import de.anomic.plasma.crawler.plasmaCrawlerException;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.server.serverFileUtils;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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public class ViewFile {
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public static final int VIEW_MODE_NO_TEXT = 0;
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public static final int VIEW_MODE_AS_PLAIN_TEXT = 1;
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public static final int VIEW_MODE_AS_PARSED_TEXT = 2;
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public static final int VIEW_MODE_AS_PARSED_SENTENCES = 3;
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public static final int VIEW_MODE_AS_IFRAME = 4;
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public static final int VIEW_MODE_AS_LINKLIST = 5;
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private static final String HIGHLIGHT_CSS = "searchHighlight";
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private static final int MAX_HIGHLIGHTS = 6;
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public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
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serverObjects prop = new serverObjects();
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plasmaSwitchboard sb = (plasmaSwitchboard)env;
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if (post != null && post.containsKey("words"))
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prop.put("error_words", wikiCode.replaceXMLEntities((String)post.get("words")));
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else {
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prop.put("error", 1);
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prop.put("viewmode", 0);
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return prop;
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}
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String viewMode = post.get("viewMode","sentences");
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prop.put("error_vMode-" + viewMode, 1);
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URL url = null;
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String descr = "";
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int wordCount = 0;
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int size = 0;
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boolean pre = false;
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// getting the url hash from which the content should be loaded
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String urlHash = post.get("urlHash","");
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if (urlHash.length() > 0) {
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// getting the urlEntry that belongs to the url hash
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indexURLEntry urlEntry = null;
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urlEntry = sb.wordIndex.loadedURL.load(urlHash, null);
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if (urlEntry == null) {
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prop.put("error",2);
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prop.put("viewMode",VIEW_MODE_NO_TEXT);
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return prop;
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}
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// gettin the url that belongs to the entry
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indexURLEntry.Components comp = urlEntry.comp();
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if ((comp == null) || (comp.url() == null)) {
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prop.put("error", 3);
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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url = comp.url();
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descr = comp.descr();
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urlEntry.wordCount();
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size = urlEntry.size();
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pre = urlEntry.flags().get(plasmaCondenser.flag_cat_indexof);
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}
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// alternatively, get the url simply from a url String
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// this can be used as a simple tool to test the text parser
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String urlString = post.get("url", "");
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if (urlString.length() > 0) try {
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// this call forces the peer to download web pages
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// it is therefore protected by the admin password
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if (!sb.verifyAuthentication(header, false)) {
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prop.put("AUTHENTICATE", "admin log-in"); // force log-in
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return prop;
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}
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// define an url by post parameter
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url = new URL(urlString);
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pre = post.get("pre", "false").equals("true");
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} catch (MalformedURLException e) {}
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if (url == null) {
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prop.put("error", 1);
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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// loading the resource content as byte array
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InputStream resource = null;
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long resourceLength = -1;
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IResourceInfo resInfo = null;
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String resMime = null;
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try {
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// trying to load the resource body
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resource = sb.cacheManager.getResourceContentStream(url);
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resourceLength = sb.cacheManager.getResourceContentLength(url);
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// if the resource body was not cached we try to load it from web
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if (resource == null) {
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plasmaHTCache.Entry entry = null;
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try {
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entry = sb.snippetCache.loadResourceFromWeb(url, 5000, false, true);
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} catch (plasmaCrawlerException e) {
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prop.put("error", 4);
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prop.put("error_errorText", e.getMessage());
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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if (entry != null) {
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resInfo = entry.getDocumentInfo();
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resource = sb.cacheManager.getResourceContentStream(url);
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resourceLength = sb.cacheManager.getResourceContentLength(url);
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}
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if (resource == null) {
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prop.put("error", 4);
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prop.put("error_errorText", "No resource available");
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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}
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// try to load resource metadata
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if (resInfo == null) {
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// try to load the metadata from cache
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try {
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resInfo = sb.cacheManager.loadResourceInfo(url);
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} catch (Exception e) {
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/* ignore this */
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}
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// if the metadata was not cached try to load it from web
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if (resInfo == null) {
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String protocol = url.getProtocol();
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if (!((protocol.equals("http") || protocol.equals("https")))) {
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prop.put("error", 6);
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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httpHeader responseHeader = httpc.whead(url, url.getHost(), 5000, null, null, sb.remoteProxyConfig);
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if (responseHeader == null) {
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prop.put("error", 4);
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prop.put("error_errorText", "Unable to load resource metadata.");
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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try {
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resInfo = sb.cacheManager.getResourceInfoFactory().buildResourceInfoObj(url, responseHeader);
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} catch (Exception e) {
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prop.put("error", 4);
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prop.put("error_errorText", e.getMessage());
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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resMime = responseHeader.mime();
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}
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} else {
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resMime = resInfo.getMimeType();
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}
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} catch (IOException e) {
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if (resource != null)
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try {
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resource.close();
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} catch (Exception ex) {
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/* ignore this */
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}
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prop.put("error", 4);
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prop.put("error_errorText", e.getMessage());
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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if (viewMode.equals("plain")) {
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// TODO: how to handle very large files here ?
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String content;
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try {
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content = new String(serverFileUtils.read(resource), "UTF-8");
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} catch (Exception e) {
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prop.put("error", 4);
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prop.put("error_errorText", e.getMessage());
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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} finally {
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if (resource != null)
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try {
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resource.close();
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} catch (Exception e) {
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/* ignore this */
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}
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}
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content = wikiCode.replaceXMLEntities(
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content.replaceAll("\n", "<br />").replaceAll("\t", " "));
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prop.put("error", 0);
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prop.put("viewMode", VIEW_MODE_AS_PLAIN_TEXT);
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prop.put("viewMode_plainText", content);
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} else if (viewMode.equals("iframe")) {
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prop.put("viewMode", VIEW_MODE_AS_IFRAME);
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prop.put("viewMode_url", wikiCode.replaceXMLEntities(url.toNormalform()));
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} else if (viewMode.equals("parsed") || viewMode.equals("sentences") || viewMode.equals("links")) {
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// parsing the resource content
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plasmaParserDocument document = null;
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try {
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document = sb.snippetCache.parseDocument(url, resourceLength, resource, resInfo);
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if (document == null) {
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prop.put("error", 5);
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prop.put("error_errorText", "Unknown error");
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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}
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} catch (ParserException e) {
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prop.put("error", 5);
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prop.put("error_errorText", e.getMessage());
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prop.put("viewMode", VIEW_MODE_NO_TEXT);
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return prop;
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} finally {
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if (resource != null)
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try {
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resource.close();
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} catch (Exception e) {
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/* ignore this */
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}
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}
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resMime = document.getMimeType();
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String[] wordArray = wordArray(post.get("words", null));
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if (viewMode.equals("parsed")) {
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String content = new String(document.getTextBytes());
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content = wikiCode.replaceHTML(content); // added by Marc Nause
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content = content.replaceAll("\n", "<br />").replaceAll("\t", " ");
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prop.put("viewMode", VIEW_MODE_AS_PARSED_TEXT);
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prop.put("viewMode_parsedText", markup(wordArray, content));
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} else if (viewMode.equals("sentences")) {
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prop.put("viewMode", VIEW_MODE_AS_PARSED_SENTENCES);
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final Iterator sentences = document.getSentences(pre);
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boolean dark = true;
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int i = 0;
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String sentence;
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if (sentences != null) {
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// Search word highlighting
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while (sentences.hasNext()) {
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sentence = (String)sentences.next();
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if (sentence.trim().length() > 0) {
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prop.put("viewMode_sentences_" + i + "_nr", Integer.toString(i + 1));
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prop.put("viewMode_sentences_" + i + "_text", markup(wordArray, sentence));
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prop.put("viewMode_sentences_" + i + "_dark", ((dark) ? 1 : 0));
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dark = !dark;
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i++;
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}
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}
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}
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prop.put("viewMode_sentences", i);
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} else if (viewMode.equals("links")) {
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prop.put("viewMode", VIEW_MODE_AS_LINKLIST);
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boolean dark = true;
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int i = 0;
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i += putMediaInfo(prop, wordArray, i, document.getVideolinks(), "video", (i % 2 == 0));
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i += putMediaInfo(prop, wordArray, i, document.getAudiolinks(), "audio", (i % 2 == 0));
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i += putMediaInfo(prop, wordArray, i, document.getApplinks(), "app", (i % 2 == 0));
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dark = (i % 2 == 0);
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TreeSet ts = document.getImages();
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Iterator tsi = ts.iterator();
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htmlFilterImageEntry entry;
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while (tsi.hasNext()) {
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entry = (htmlFilterImageEntry) tsi.next();
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prop.put("viewMode_links_" + i + "_nr", i);
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prop.put("viewMode_links_" + i + "_dark", ((dark) ? 1 : 0));
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prop.put("viewMode_links_" + i + "_type", "image");
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prop.put("viewMode_links_" + i + "_text", markup(wordArray, entry.alt()));
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prop.put("viewMode_links_" + i + "_link", "<a href=\"" + (String) entry.url().toNormalform() + "\">" + markup(wordArray, (String) entry.url().toNormalform()) + "</a>");
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prop.put("viewMode_links_" + i + "_attr", entry.width() + " x " + entry.height());
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dark = !dark;
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i++;
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}
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prop.put("viewMode_links", i);
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}
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if (document != null) document.close();
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}
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prop.put("error", 0);
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prop.put("error_url", wikiCode.replaceXMLEntities(url.toNormalform()));
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prop.put("error_hash", urlHash);
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prop.put("error_wordCount", Integer.toString(wordCount));
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prop.put("error_desc", descr);
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prop.put("error_size", size);
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prop.put("error_mimeTypeAvailable", (resMime == null) ? 0 : 1);
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prop.put("error_mimeTypeAvailable_mimeType", resMime);
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return prop;
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}
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private static final String[] wordArray(String words) {
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String[] w = null;
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if (words != null) try {
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words = URLDecoder.decode(words, "UTF-8");
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w = words.substring(1, words.length() - 1).split(",");
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if (w.length == 0) return null;
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} catch (UnsupportedEncodingException e) {}
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return w;
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}
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private static final String markup(String[] wordArray, String message) {
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message = wikiCode.replaceHTML(message);
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if (wordArray != null)
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for (int j = 0; j < wordArray.length; j++) {
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String currentWord = wordArray[j].trim();
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message = message.replaceAll(currentWord,
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"<span class=\"" + HIGHLIGHT_CSS + ((j % MAX_HIGHLIGHTS) + 1) + "\">" +
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currentWord +
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"</span>");
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}
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return message;
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}
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private static int putMediaInfo(serverObjects prop, String[] wordArray, int c, Map media, String name, boolean dark) {
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Iterator mi = media.entrySet().iterator();
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Map.Entry entry;
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int i = 0;
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while (mi.hasNext()) {
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entry = (Map.Entry) mi.next();
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prop.put("viewMode_links_" + c + "_nr", c);
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prop.put("viewMode_links_" + c + "_dark", ((dark) ? 1 : 0));
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prop.put("viewMode_links_" + c + "_type", name);
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prop.put("viewMode_links_" + c + "_text", markup(wordArray, (String) entry.getValue()));
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prop.put("viewMode_links_" + c + "_link", "<a href=\"" + (String) entry.getKey() + "\">" + markup(wordArray, (String) entry.getKey()) + "</a>");
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prop.put("viewMode_links_" + c + "_attr", "");
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dark = !dark;
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c++;
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i++;
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}
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return i;
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}
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}
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