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yacy_search_server/htroot/ViewFile.java
orbiter a31b9097a4 preparations for mass remote crawls: 
two main changes must be implemented to enable mass remote crawls:
- shift control of robots.txt to crawl queue (away from stacker). This is necessary since remote
  crawls can contain unchecked urls. Each peer must check the robots to prevent that it is misused
  as crawl agent for unwanted file retrieval
- implement new index files that control double-check of remotely crawled urls

After removal of robots.txt checking from stacker threads, the multi-threading of this process is void.
Multithreading has been removed. Also the thread pools for the crawl threads had been removed, since
creation of these threads is not resource-consuming, for a detailed explanation see svn 4106

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4181 6c8d7289-2bf4-0310-a012-ef5d649a1542
2007-10-29 01:43:20 +00:00

423 lines
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Java
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//ViewFile.java
//-----------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@anomic.de
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//last major change: 12.07.2004
//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
//Using this software in any meaning (reading, learning, copying, compiling,
//running) means that you agree that the Author(s) is (are) not responsible
//for cost, loss of data or any harm that may be caused directly or indirectly
//by usage of this softare or this documentation. The usage of this software
//is on your own risk. The installation and usage (starting/running) of this
//software may allow other people or application to access your computer and
//any attached devices and is highly dependent on the configuration of the
//software which must be done by the user of the software; the author(s) is
//(are) also not responsible for proper configuration and usage of the
//software, even if provoked by documentation provided together with
//the software.
//Any changes to this file according to the GPL as documented in the file
//gpl.txt aside this file in the shipment you received can be done to the
//lines that follows this copyright notice here, but changes must not be
//done inside the copyright notive above. A re-distribution must contain
//the intact and unchanged copyright notice.
//Contributions and changes to the program code must be marked as such.
//you must compile this file with
//javac -classpath .:../Classes Status.java
//if the shell's current path is HTROOT
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URLDecoder;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeSet;
import de.anomic.data.htmlTools;
import de.anomic.htmlFilter.htmlFilterImageEntry;
import de.anomic.http.httpHeader;
import de.anomic.http.httpc;
import de.anomic.index.indexURLEntry;
import de.anomic.plasma.plasmaCondenser;
import de.anomic.plasma.plasmaHTCache;
import de.anomic.plasma.plasmaParserDocument;
import de.anomic.plasma.plasmaSnippetCache;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.plasma.cache.IResourceInfo;
import de.anomic.plasma.parser.ParserException;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.yacy.yacyURL;
public class ViewFile {
public static final int VIEW_MODE_NO_TEXT = 0;
public static final int VIEW_MODE_AS_PLAIN_TEXT = 1;
public static final int VIEW_MODE_AS_PARSED_TEXT = 2;
public static final int VIEW_MODE_AS_PARSED_SENTENCES = 3;
public static final int VIEW_MODE_AS_IFRAME = 4;
public static final int VIEW_MODE_AS_LINKLIST = 5;
private static final String HIGHLIGHT_CSS = "searchHighlight";
private static final int MAX_HIGHLIGHTS = 6;
public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
serverObjects prop = new serverObjects();
plasmaSwitchboard sb = (plasmaSwitchboard)env;
if (post != null && post.containsKey("words"))
prop.putHTML("error_words", (String)post.get("words"));
else {
prop.put("error", "1");
prop.put("viewmode", "0");
return prop;
}
String viewMode = post.get("viewMode","sentences");
prop.put("error_vMode-" + viewMode, "1");
yacyURL url = null;
String descr = "";
int wordCount = 0;
int size = 0;
boolean pre = false;
// getting the url hash from which the content should be loaded
String urlHash = post.get("urlHash","");
if (urlHash.length() > 0) {
// getting the urlEntry that belongs to the url hash
indexURLEntry urlEntry = null;
urlEntry = sb.wordIndex.loadedURL.load(urlHash, null);
if (urlEntry == null) {
prop.put("error", "2");
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
// gettin the url that belongs to the entry
indexURLEntry.Components comp = urlEntry.comp();
if ((comp == null) || (comp.url() == null)) {
prop.put("error", "3");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
url = comp.url();
descr = comp.title();
urlEntry.wordCount();
size = urlEntry.size();
pre = urlEntry.flags().get(plasmaCondenser.flag_cat_indexof);
}
// alternatively, get the url simply from a url String
// this can be used as a simple tool to test the text parser
String urlString = post.get("url", "");
if (urlString.length() > 0) try {
// this call forces the peer to download web pages
// it is therefore protected by the admin password
if (!sb.verifyAuthentication(header, false)) {
prop.put("AUTHENTICATE", "admin log-in"); // force log-in
return prop;
}
// define an url by post parameter
url = new yacyURL(urlString, null);
pre = post.get("pre", "false").equals("true");
} catch (MalformedURLException e) {}
if (url == null) {
prop.put("error", "1");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
// loading the resource content as byte array
InputStream resource = null;
long resourceLength = -1;
IResourceInfo resInfo = null;
String resMime = null;
try {
// trying to load the resource body
resource = plasmaHTCache.getResourceContentStream(url);
resourceLength = plasmaHTCache.getResourceContentLength(url);
// if the resource body was not cached we try to load it from web
if (resource == null) {
plasmaHTCache.Entry entry = null;
try {
entry = sb.crawlQueues.loadResourceFromWeb(url, 5000, false, true);
} catch (Exception e) {
prop.put("error", "4");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
if (entry != null) {
resInfo = entry.getDocumentInfo();
resource = plasmaHTCache.getResourceContentStream(url);
resourceLength = plasmaHTCache.getResourceContentLength(url);
}
if (resource == null) {
prop.put("error", "4");
prop.put("error_errorText", "No resource available");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
}
// try to load resource metadata
if (resInfo == null) {
// try to load the metadata from cache
try {
resInfo = plasmaHTCache.loadResourceInfo(url);
} catch (Exception e) {
/* ignore this */
}
// if the metadata was not cached try to load it from web
if (resInfo == null) {
String protocol = url.getProtocol();
if (!((protocol.equals("http") || protocol.equals("https")))) {
prop.put("error", "6");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
httpHeader responseHeader = httpc.whead(url, url.getHost(), 5000, null, null, sb.remoteProxyConfig);
if (responseHeader == null) {
prop.put("error", "4");
prop.put("error_errorText", "Unable to load resource metadata.");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
try {
resInfo = plasmaHTCache.getResourceInfoFactory().buildResourceInfoObj(url, responseHeader);
} catch (Exception e) {
prop.put("error", "4");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
resMime = responseHeader.mime();
}
} else {
resMime = resInfo.getMimeType();
}
} catch (IOException e) {
if (resource != null)
try {
resource.close();
} catch (Exception ex) {
/* ignore this */
}
prop.put("error", "4");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
if (viewMode.equals("plain")) {
// TODO: how to handle very large files here ?
String content;
try {
content = new String(serverFileUtils.read(resource), "UTF-8");
} catch (Exception e) {
prop.put("error", "4");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
} finally {
if (resource != null)
try {
resource.close();
} catch (Exception e) {
/* ignore this */
}
}
content = content.replaceAll("\n", "<br />").replaceAll("\t", "&nbsp;&nbsp;&nbsp;&nbsp;");
prop.put("error", "0");
prop.put("viewMode", VIEW_MODE_AS_PLAIN_TEXT);
prop.putHTML("viewMode_plainText", content);
} else if (viewMode.equals("iframe")) {
prop.put("viewMode", VIEW_MODE_AS_IFRAME);
prop.put("viewMode_url", url.toNormalform(false, true));
} else if (viewMode.equals("parsed") || viewMode.equals("sentences") || viewMode.equals("links")) {
// parsing the resource content
plasmaParserDocument document = null;
try {
document = plasmaSnippetCache.parseDocument(url, resourceLength, resource, resInfo);
if (document == null) {
prop.put("error", "5");
prop.put("error_errorText", "Unknown error");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
} catch (ParserException e) {
prop.put("error", "5");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
} finally {
if (resource != null)
try {
resource.close();
} catch (Exception e) {
/* ignore this */
}
}
resMime = document.getMimeType();
String[] wordArray = wordArray(post.get("words", null));
if (viewMode.equals("parsed")) {
String content = new String(document.getTextBytes());
// content = wikiCode.replaceHTML(content); // added by Marc Nause
content = content.replaceAll("\n", "<br />").replaceAll("\t", "&nbsp;&nbsp;&nbsp;&nbsp;");
prop.put("viewMode", VIEW_MODE_AS_PARSED_TEXT);
prop.put("viewMode_parsedText", markup(wordArray, content));
} else if (viewMode.equals("sentences")) {
prop.put("viewMode", VIEW_MODE_AS_PARSED_SENTENCES);
final Iterator sentences = document.getSentences(pre);
boolean dark = true;
int i = 0;
String sentence;
if (sentences != null) {
// Search word highlighting
while (sentences.hasNext()) {
sentence = ((StringBuffer) sentences.next()).toString();
if (sentence.trim().length() > 0) {
prop.put("viewMode_sentences_" + i + "_nr", i + 1);
prop.put("viewMode_sentences_" + i + "_text", markup(wordArray, sentence));
prop.put("viewMode_sentences_" + i + "_dark", dark ? "1" : "0");
dark = !dark;
i++;
}
}
}
prop.put("viewMode_sentences", i);
} else if (viewMode.equals("links")) {
prop.put("viewMode", VIEW_MODE_AS_LINKLIST);
boolean dark = true;
int i = 0;
i += putMediaInfo(prop, wordArray, i, document.getVideolinks(), "video", (i % 2 == 0));
i += putMediaInfo(prop, wordArray, i, document.getAudiolinks(), "audio", (i % 2 == 0));
dark = (i % 2 == 0);
TreeSet ts = document.getImages();
Iterator tsi = ts.iterator();
htmlFilterImageEntry entry;
while (tsi.hasNext()) {
entry = (htmlFilterImageEntry) tsi.next();
prop.put("viewMode_links_" + i + "_nr", i);
prop.put("viewMode_links_" + i + "_dark", dark ? "1" : "0");
prop.put("viewMode_links_" + i + "_type", "image");
prop.put("viewMode_links_" + i + "_text", markup(wordArray, entry.alt()));
prop.put("viewMode_links_" + i + "_url", entry.url().toNormalform(false, true));
prop.put("viewMode_links_" + i + "_link", markup(wordArray, entry.url().toNormalform(false, true)));
if (entry.width() > 0 && entry.height() > 0)
prop.put("viewMode_links_" + i + "_attr", entry.width() + "x" + entry.height() + " Pixel");
else
prop.put("viewMode_links_" + i + "_attr", "unknown");
dark = !dark;
i++;
}
i += putMediaInfo(prop, wordArray, i, document.getApplinks(), "app", (i % 2 == 0));
i += putMediaInfo(prop, wordArray, i, document.getHyperlinks(), "href", (i % 2 == 0));
prop.put("viewMode_links", i);
}
if (document != null) document.close();
}
prop.put("error", "0");
prop.put("error_url", url.toNormalform(false, true));
prop.put("error_hash", urlHash);
prop.put("error_wordCount", wordCount);
prop.putHTML("error_desc", descr);
prop.putNum("error_size", size);
prop.put("error_mimeTypeAvailable", (resMime == null) ? "0" : "1");
prop.put("error_mimeTypeAvailable_mimeType", resMime);
return prop;
}
private static final String[] wordArray(String words) {
String[] w = null;
if (words != null) try {
words = URLDecoder.decode(words, "UTF-8");
w = words.substring(1, words.length() - 1).split(",");
if (w.length == 0) return null;
} catch (UnsupportedEncodingException e) {}
return w;
}
private static final String markup(String[] wordArray, String message) {
message = htmlTools.encodeUnicode2html(message, true);
if (wordArray != null)
for (int j = 0; j < wordArray.length; j++) {
String currentWord = wordArray[j].trim();
// TODO: replace upper-/lowercase words as well
message = message.replaceAll(currentWord,
"<span class=\"" + HIGHLIGHT_CSS + ((j % MAX_HIGHLIGHTS) + 1) + "\">" +
currentWord +
"</span>");
}
return message;
}
private static int putMediaInfo(serverObjects prop, String[] wordArray, int c, Map media, String name, boolean dark) {
Iterator mi = media.entrySet().iterator();
Map.Entry entry;
int i = 0;
while (mi.hasNext()) {
entry = (Map.Entry) mi.next();
prop.put("viewMode_links_" + c + "_nr", c);
prop.put("viewMode_links_" + c + "_dark", ((dark) ? 1 : 0));
prop.putHTML("viewMode_links_" + c + "_type", name);
prop.put("viewMode_links_" + c + "_text", markup(wordArray, (String) entry.getValue()));
prop.put("viewMode_links_" + c + "_link", markup(wordArray, (String) entry.getKey()));
prop.put("viewMode_links_" + c + "_url", entry.getKey());
prop.putHTML("viewMode_links_" + c + "_attr", "");
dark = !dark;
c++;
i++;
}
return i;
}
}
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