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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@yacy.net
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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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//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.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.util.Enumeration;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import de.anomic.htmlFilter.htmlFilterImageEntry;
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import de.anomic.htmlFilter.htmlFilterCharacterCoding;
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import de.anomic.http.httpClient;
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import de.anomic.http.httpRequestHeader;
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import de.anomic.http.httpResponseHeader;
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import de.anomic.index.indexDocumentMetadata;
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import de.anomic.index.indexURLReference;
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import de.anomic.kelondro.util.FileUtils;
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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.plasmaSnippetCache;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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import de.anomic.yacy.yacyURL;
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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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public static final int VIEW_MODE_AS_PARSED_WORDS = 6;
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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(final httpRequestHeader header, final serverObjects post, final serverSwitch<?> env) {
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final serverObjects prop = new serverObjects();
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final plasmaSwitchboard sb = (plasmaSwitchboard)env;
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final int display = (post == null) ? 0 : post.getInt("display", 0);
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prop.put("display", display);
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prop.put("error_display", display);
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if (post != null && post.containsKey("words"))
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prop.putHTML("error_words", post.get("words"));
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else {
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prop.putHTML("error_words", "");
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}
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final String viewMode = post.get("viewMode","sentences");
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prop.put("error_vMode-" + viewMode, "1");
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yacyURL url = null;
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String descr = "";
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final 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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final 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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indexURLReference urlEntry = null;
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urlEntry = sb.webIndex.getURL(urlHash, null, 0);
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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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// getting the url that belongs to the entry
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final indexURLReference.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.dc_title();
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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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final 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 yacyURL(urlString, null);
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pre = post.get("pre", "false").equals("true");
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} catch (final 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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httpResponseHeader responseHeader = null;
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String resMime = null;
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// trying to load the resource body
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resource = plasmaHTCache.getResourceContentStream(url);
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resourceLength = plasmaHTCache.getResourceContentLength(url);
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try {
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responseHeader = plasmaHTCache.loadResponseHeader(url);
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} catch (IllegalAccessException e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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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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indexDocumentMetadata entry = null;
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try {
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entry = sb.crawlQueues.loadResourceFromWeb(url, 5000, false, true, false);
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} catch (final Exception e) {
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prop.put("error", "4");
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prop.putHTML("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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resource = plasmaHTCache.getResourceContentStream(url);
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resourceLength = plasmaHTCache.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 (responseHeader == null) {
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// try to load the metadata from cache
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try {
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responseHeader = plasmaHTCache.loadResponseHeader(url);
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} catch (final 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 (responseHeader == null) {
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final 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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responseHeader = httpClient.whead(url.toString());
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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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resMime = responseHeader.mime();
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}
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} else {
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resMime = responseHeader.mime();
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}
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final String[] wordArray = wordArray(post.get("words", null));
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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(FileUtils.read(resource), "UTF-8");
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} catch (final Exception e) {
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prop.put("error", "4");
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prop.putHTML("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 (final Exception e) {
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/* ignore this */
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}
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}
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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", markup(wordArray, content).replaceAll("\n", "<br />").replaceAll("\t", " "));
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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", url.toNormalform(false, true));
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} else if (viewMode.equals("parsed") || viewMode.equals("sentences") || viewMode.equals("words") || 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 = plasmaSnippetCache.parseDocument(url, resourceLength, resource);
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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 (final ParserException e) {
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prop.put("error", "5");
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prop.putHTML("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 (final Exception e) {
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/* ignore this */
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}
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}
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resMime = document.dc_format();
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if (viewMode.equals("parsed")) {
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final String content = new String(document.getTextBytes());
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// content = wikiCode.replaceHTML(content); // added by Marc Nause
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prop.put("viewMode", VIEW_MODE_AS_PARSED_TEXT);
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prop.put("viewMode_parsedText", markup(wordArray, content).replaceAll("\n", "<br />").replaceAll("\t", " "));
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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<StringBuilder> 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 = sentences.next().toString();
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if (sentence.trim().length() > 0) {
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prop.put("viewMode_sentences_" + i + "_nr", 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("words")) {
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prop.put("viewMode", VIEW_MODE_AS_PARSED_WORDS);
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final Iterator<StringBuilder> sentences = document.getSentences(pre);
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boolean dark = true;
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int i = 0;
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String sentence, token;
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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 = sentences.next().toString();
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Enumeration<StringBuilder> tokens = plasmaCondenser.wordTokenizer(sentence, "UTF-8");
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while (tokens.hasMoreElements()) {
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token = tokens.nextElement().toString();
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if (token.length() > 0) {
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prop.put("viewMode_words_" + i + "_nr", i + 1);
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prop.put("viewMode_words_" + i + "_word", token);
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prop.put("viewMode_words_" + 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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}
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prop.put("viewMode_words", 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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dark = (i % 2 == 0);
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final HashMap<String, htmlFilterImageEntry> ts = document.getImages();
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final Iterator<htmlFilterImageEntry> tsi = ts.values().iterator();
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htmlFilterImageEntry entry;
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while (tsi.hasNext()) {
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entry = 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 + "_url", entry.url().toNormalform(false, true));
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prop.put("viewMode_links_" + i + "_link", markup(wordArray, entry.url().toNormalform(false, true)));
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if (entry.width() > 0 && entry.height() > 0)
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prop.put("viewMode_links_" + i + "_attr", entry.width() + "x" + entry.height() + " Pixel");
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else
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prop.put("viewMode_links_" + i + "_attr", "unknown");
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dark = !dark;
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i++;
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}
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i += putMediaInfo(prop, wordArray, i, document.getApplinks(), "app", (i % 2 == 0));
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i += putMediaInfo(prop, wordArray, i, document.getHyperlinks(), "href", (i % 2 == 0));
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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", url.toNormalform(false, true));
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prop.put("error_hash", urlHash);
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prop.put("error_wordCount", wordCount);
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prop.putHTML("error_desc", descr);
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prop.putNum("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 = new String[0];
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if (words == null || words.length() == 0) return w;
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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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} catch (final UnsupportedEncodingException e) {}
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return w;
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}
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private static final String markup(final String[] wordArray, String message) {
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message = htmlFilterCharacterCoding.unicode2html(message, true);
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if (wordArray != null)
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for (int j = 0; j < wordArray.length; j++) {
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final String currentWord = wordArray[j].trim();
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// TODO: replace upper-/lowercase words as well
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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(final serverObjects prop, final String[] wordArray, int c, final Map<yacyURL, String> media, final String name, boolean dark) {
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final Iterator<Map.Entry<yacyURL, String>> mi = media.entrySet().iterator();
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Map.Entry<yacyURL, String> entry;
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int i = 0;
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while (mi.hasNext()) {
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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.putHTML("viewMode_links_" + c + "_type", name);
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prop.put("viewMode_links_" + c + "_text", markup(wordArray, entry.getValue()));
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prop.put("viewMode_links_" + c + "_link", markup(wordArray, entry.getKey().toNormalform(true, false)));
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prop.put("viewMode_links_" + c + "_url", entry.getKey().toNormalform(true, false));
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prop.putHTML("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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