//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.URLDecoder;
import java.net.URLEncoder;
import java.util.Enumeration;
import de.anomic.data.wikiCode;
import de.anomic.http.httpHeader;
import de.anomic.http.httpc;
import de.anomic.net.URL;
import de.anomic.plasma.plasmaCrawlLURLEntry;
import de.anomic.plasma.plasmaHTCache;
import de.anomic.plasma.plasmaParserDocument;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.plasma.cache.IResourceInfo;
import de.anomic.plasma.crawler.plasmaCrawlerException;
import de.anomic.plasma.parser.ParserException;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
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 String[] highlightingColors = new String[] {
"255,255,100",
"255,155,155",
"0,255,0",
"0,255,255",
"204,153,0",
"204,153,255"
};
public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
serverObjects prop = new serverObjects();
plasmaSwitchboard sb = (plasmaSwitchboard)env;
if (post != null && post.containsKey("words"))
try {
prop.put("error_words",URLEncoder.encode((String) post.get("words"), "UTF-8"));
} catch (UnsupportedEncodingException e1) {
// ignore this. this should not occure
}
// getting the url hash from which the content should be loaded
String urlHash = post.get("urlHash","");
if (urlHash.equals("")) {
prop.put("error",1);
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
String viewMode = post.get("viewMode","sentences");
// getting the urlEntry that belongs to the url hash
plasmaCrawlLURLEntry urlEntry = null;
urlEntry = sb.urlPool.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
URL url = urlEntry.url();
if (url == null) {
prop.put("error",3);
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 = sb.cacheManager.getResourceContentStream(url);
resourceLength = sb.cacheManager.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.snippetCache.loadResourceFromWeb(url, 5000, false);
} catch (plasmaCrawlerException e) {
prop.put("error",4);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
if (entry != null) {
resInfo = entry.getDocumentInfo();
resource = sb.cacheManager.getResourceContentStream(url);
resourceLength = sb.cacheManager.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 = sb.cacheManager.loadResourceInfo(urlEntry.url());
} catch (Exception e) { /* ignore this */}
// if the metadata where 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 = sb.cacheManager.getResourceInfoFactory().buildResourceInfoObj(url, responseHeader);
} catch (Exception e) {
prop.put("error",4);
prop.put("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.put("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.put("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("<","<")
.replaceAll(">",">")
.replaceAll("\"",""")
.replaceAll("\n","
")
.replaceAll("\t"," ");
prop.put("error",0);
prop.put("viewMode",VIEW_MODE_AS_PLAIN_TEXT);
prop.put("viewMode_plainText",content);
} else if (viewMode.equals("iframe")) {
prop.put("viewMode",VIEW_MODE_AS_IFRAME);
prop.put("viewMode_url",url.toString());
} else if (viewMode.equals("parsed") || viewMode.equals("sentences")) {
// parsing the resource content
plasmaParserDocument document = null;
try {
document = sb.snippetCache.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.put("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();
if (viewMode.equals("parsed")) {
String content = new String(document.getTextBytes());
content = wikiCode.replaceHTML(content); //added by Marc Nause
content = content.replaceAll("\n","
")
.replaceAll("\t"," ");
prop.put("viewMode",VIEW_MODE_AS_PARSED_TEXT);
prop.put("viewMode_parsedText",content);
} else {
prop.put("viewMode",VIEW_MODE_AS_PARSED_SENTENCES);
final Enumeration sentences = document.getSentences(null); // FIXME: apply correct charset
boolean dark = true;
int i = 0;
if (sentences != null) while (sentences.hasMoreElements()) {
String currentSentence = wikiCode.replaceHTML((String) sentences.nextElement());
// Search word highlighting
String words = post.get("words",null);
if (words != null) {
try {
words = URLDecoder.decode(words,"UTF-8");
} catch (UnsupportedEncodingException e) {}
String[] wordArray = words.substring(1,words.length()-1).split(",");
for (int j=0; j < wordArray.length; j++) {
String currentWord = wordArray[j].trim();
currentSentence = currentSentence.replaceAll(currentWord,
"" + currentWord + "");
}
}
prop.put("viewMode_sentences_" + i + "_nr",Integer.toString(i+1));
prop.put("viewMode_sentences_" + i + "_text",currentSentence);
prop.put("viewMode_sentences_" + i + "_dark",((dark) ? 1 : 0) ); dark=!dark;
i++;
}
prop.put("viewMode_sentences", i);
}
if (document != null) document.close();
}
prop.put("error",0);
prop.put("error_url",url.toString());
prop.put("error_hash",urlHash);
prop.put("error_wordCount",Integer.toString(urlEntry.wordCount()));
prop.put("error_desc",urlEntry.descr());
prop.put("error_size",urlEntry.size());
prop.put("error_mimeType",resMime);
return prop;
}
}