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yacy_search_server/htroot/ViewFile.java

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//ViewFile.java
//-----------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@yacy.net
//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
//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.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import net.yacy.document.Condenser;
import net.yacy.document.Document;
import net.yacy.document.ParserException;
import net.yacy.document.parser.html.CharacterCoding;
import net.yacy.document.parser.html.ImageEntry;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.data.meta.URIMetadataRow;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.repository.LoaderDispatcher;
import de.anomic.crawler.retrieval.Response;
import de.anomic.http.client.Client;
import de.anomic.http.client.Cache;
import de.anomic.http.server.RequestHeader;
import de.anomic.http.server.ResponseHeader;
import de.anomic.search.Segment;
import de.anomic.search.Segments;
import de.anomic.search.Switchboard;
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 int VIEW_MODE_AS_LINKLIST = 5;
public static final int VIEW_MODE_AS_PARSED_WORDS = 6;
private static final String HIGHLIGHT_CSS = "searchHighlight";
private static final int MAX_HIGHLIGHTS = 6;
public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
final serverObjects prop = new serverObjects();
final Switchboard sb = (Switchboard)env;
final int display = (post == null) ? 0 : post.getInt("display", 0);
// get segment
Segment indexSegment = null;
if (post != null && post.containsKey("segment")) {
String segmentName = post.get("segment");
if (sb.indexSegments.segmentExist(segmentName)) {
indexSegment = sb.indexSegments.segment(segmentName);
}
} else {
// take default segment
indexSegment = sb.indexSegments.segment(Segments.Process.PUBLIC);
}
prop.put("display", display);
prop.put("error_display", display);
if (post != null && post.containsKey("words"))
prop.putHTML("error_words", post.get("words"));
else {
prop.putHTML("error_words", "");
}
final String viewMode = post.get("viewMode","sentences");
prop.put("error_vMode-" + viewMode, "1");
DigestURI url = null;
String descr = "";
final int wordCount = 0;
int size = 0;
boolean pre = false;
// get the url hash from which the content should be loaded
final String urlHash = post.get("urlHash","");
if (urlHash.length() > 0) {
// get the urlEntry that belongs to the url hash
URIMetadataRow urlEntry = null;
urlEntry = indexSegment.urlMetadata().load(urlHash, null, 0);
if (urlEntry == null) {
prop.put("error", "2");
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
// getting the url that belongs to the entry
final URIMetadataRow.Components metadata = urlEntry.metadata();
if ((metadata == null) || (metadata.url() == null)) {
prop.put("error", "3");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
url = metadata.url();
descr = metadata.dc_title();
//urlEntry.wordCount();
size = urlEntry.size();
pre = urlEntry.flags().get(Condenser.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
final 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 DigestURI(urlString, null);
pre = post.get("pre", "false").equals("true");
} catch (final 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;
ResponseHeader responseHeader = null;
String resMime = null;
// trying to load the resource body
try {
resource = Cache.getContentStream(url);
} catch (IOException e) {
Log.logException(e);
resource = null;
}
resourceLength = Cache.getResourceContentLength(url);
responseHeader = Cache.getResponseHeader(url);
// if the resource body was not cached we try to load it from web
if (resource == null) {
Response entry = null;
try {
entry = sb.loader.load(url, true, false);
} catch (final Exception e) {
prop.put("error", "4");
prop.putHTML("error_errorText", e.getMessage());
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
if (entry != null) {
try {
resource = Cache.getContentStream(url);
} catch (IOException e) {
Log.logException(e);
resource = null;
}
resourceLength = Cache.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 (responseHeader == null) {
// try to load the metadata from cache
try {
responseHeader = Cache.getResponseHeader(url);
} catch (final Exception e) {
/* ignore this */
}
// if the metadata was not cached try to load it from web
if (responseHeader == null) {
final String protocol = url.getProtocol();
if (!((protocol.equals("http") || protocol.equals("https")))) {
prop.put("error", "6");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
responseHeader = Client.whead(url.toString());
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;
}
resMime = responseHeader.mime();
}
} else {
resMime = responseHeader.mime();
}
final String[] wordArray = wordArray(post.get("words", null));
if (viewMode.equals("plain")) {
// TODO: how to handle very large files here ?
String content;
try {
content = new String(FileUtils.read(resource), "UTF-8");
} catch (final 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 (final Exception e) {
/* ignore this */
}
}
prop.put("error", "0");
prop.put("viewMode", VIEW_MODE_AS_PLAIN_TEXT);
prop.put("viewMode_plainText", markup(wordArray, content).replaceAll("\n", "<br />").replaceAll("\t", "&nbsp;&nbsp;&nbsp;&nbsp;"));
} 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("words") || viewMode.equals("links")) {
// parsing the resource content
Document document = null;
try {
document = LoaderDispatcher.parseDocument(url, resourceLength, resource, null);
if (document == null) {
prop.put("error", "5");
prop.put("error_errorText", "Unknown error");
prop.put("viewMode", VIEW_MODE_NO_TEXT);
return prop;
}
} catch (final 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 (final Exception e) {
/* ignore this */
}
}
resMime = document.dc_format();
if (viewMode.equals("parsed")) {
final String content = new String(document.getTextBytes());
// content = wikiCode.replaceHTML(content); // added by Marc Nause
prop.put("viewMode", VIEW_MODE_AS_PARSED_TEXT);
prop.put("viewMode_parsedText", markup(wordArray, content).replaceAll("\n", "<br />").replaceAll("\t", "&nbsp;&nbsp;&nbsp;&nbsp;"));
} else if (viewMode.equals("sentences")) {
prop.put("viewMode", VIEW_MODE_AS_PARSED_SENTENCES);
final Iterator<StringBuilder> sentences = document.getSentences(pre);
boolean dark = true;
int i = 0;
String sentence;
if (sentences != null) {
// Search word highlighting
while (sentences.hasNext()) {
sentence = 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("words")) {
prop.put("viewMode", VIEW_MODE_AS_PARSED_WORDS);
final Iterator<StringBuilder> sentences = document.getSentences(pre);
boolean dark = true;
int i = 0;
String sentence, token;
if (sentences != null) {
// Search word highlighting
while (sentences.hasNext()) {
sentence = sentences.next().toString();
Enumeration<StringBuilder> tokens = Condenser.wordTokenizer(sentence, "UTF-8");
while (tokens.hasMoreElements()) {
token = tokens.nextElement().toString();
if (token.length() > 0) {
prop.put("viewMode_words_" + i + "_nr", i + 1);
prop.put("viewMode_words_" + i + "_word", token);
prop.put("viewMode_words_" + i + "_dark", dark ? "1" : "0");
dark = !dark;
i++;
}
}
}
}
prop.put("viewMode_words", 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);
final HashMap<String, ImageEntry> ts = document.getImages();
final Iterator<ImageEntry> tsi = ts.values().iterator();
ImageEntry entry;
while (tsi.hasNext()) {
entry = 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 = new String[0];
if (words == null || words.length() == 0) return w;
try {
words = URLDecoder.decode(words, "UTF-8");
w = words.substring(1, words.length() - 1).split(",");
} catch (final UnsupportedEncodingException e) {}
return w;
}
private static final String markup(final String[] wordArray, String message) {
message = CharacterCoding.unicode2html(message, true);
if (wordArray != null)
for (int j = 0; j < wordArray.length; j++) {
final 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(final serverObjects prop, final String[] wordArray, int c, final Map<DigestURI, String> media, final String name, boolean dark) {
final Iterator<Map.Entry<DigestURI, String>> mi = media.entrySet().iterator();
Map.Entry<DigestURI, String> entry;
int i = 0;
while (mi.hasNext()) {
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, entry.getValue()));
prop.put("viewMode_links_" + c + "_link", markup(wordArray, entry.getKey().toNormalform(true, false)));
prop.put("viewMode_links_" + c + "_url", entry.getKey().toNormalform(true, false));
prop.putHTML("viewMode_links_" + c + "_attr", "");
dark = !dark;
c++;
i++;
}
return i;
}
}
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