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yacy_search_server/source/de/anomic/plasma/plasmaParser.java
orbiter 96174b2b56 more debugging / better result status logging for parser/caching errors 
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5341 6c8d7289-2bf4-0310-a012-ef5d649a1542
2008-11-13 23:41:43 +00:00

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// plasmaParser.java
// (C) 2005 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published in january 2005 on http://yacy.net
// with contributions 02.05.2005 by Martin Thelian
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// LICENSE
//
// 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
package de.anomic.plasma;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.anomic.htmlFilter.htmlFilterContentScraper;
import de.anomic.htmlFilter.htmlFilterImageEntry;
import de.anomic.htmlFilter.htmlFilterInputStream;
import de.anomic.htmlFilter.htmlFilterWriter;
import de.anomic.http.JakartaCommonsHttpClient;
import de.anomic.http.JakartaCommonsHttpResponse;
import de.anomic.plasma.parser.Parser;
import de.anomic.plasma.parser.ParserException;
import de.anomic.plasma.parser.ParserInfo;
import de.anomic.server.serverFileUtils;
import de.anomic.server.logging.serverLog;
import de.anomic.tools.ListDirs;
import de.anomic.yacy.yacyURL;
public final class plasmaParser {
public static final String PARSER_MODE_PROXY = "PROXY";
public static final String PARSER_MODE_CRAWLER = "CRAWLER";
public static final String PARSER_MODE_URLREDIRECTOR = "URLREDIRECTOR";
public static final String PARSER_MODE_ICAP = "ICAP";
public static final String PARSER_MODE_IMAGE = "IMAGE";
public static final HashSet<String> PARSER_MODE = new HashSet<String>(Arrays.asList(new String[]{
PARSER_MODE_PROXY,
PARSER_MODE_CRAWLER,
PARSER_MODE_ICAP,
PARSER_MODE_URLREDIRECTOR,
PARSER_MODE_IMAGE
}));
private static final HashMap<String, plasmaParserConfig> parserConfigList = new HashMap<String, plasmaParserConfig>();
/**
* A list containing all installed parsers and the mimeType that they support
* @see #loadAvailableParserList()
*/
public static final HashMap<String, ParserInfo> availableParserList = new HashMap<String, ParserInfo>();
/**
* A list of file extensions and mime types that are supported by the html-parser
*/
public static final HashSet<String> supportedHTMLFileExt = new HashSet<String>();
public static final HashSet<String> supportedHTMLMimeTypes = new HashSet<String>();
private static final Properties mimeTypeLookupByFileExt = new Properties();
static {
// loading a list of extensions from file
BufferedInputStream bufferedIn = null;
try {
mimeTypeLookupByFileExt.load(bufferedIn = new BufferedInputStream(new FileInputStream(new File("httpd.mime"))));
} catch (final IOException e) {
System.err.println("ERROR: httpd.mime not found in settings path");
} finally {
if (bufferedIn != null) try{bufferedIn.close();}catch(final Exception e){}
}
}
/**
* A list of media extensions that should <b>not</b> be handled by the plasmaParser
*/
private static final HashSet<String> mediaExtSet = new HashSet<String>();
/**
* A list of image, audio, video and application extensions
*/
private static final HashSet<String> imageExtSet = new HashSet<String>();
private static final HashSet<String> audioExtSet = new HashSet<String>();
private static final HashSet<String> videoExtSet = new HashSet<String>();
private static final HashSet<String> appsExtSet = new HashSet<String>();
/**
* This {@link FilenameFilter} is used to find all classes based on there filenames
* which seems to be additional content parsers.
* Currently the filenames of all content parser classes must end with <code>Parser.class</code>
*/
/*
private static final FilenameFilter parserFileNameFilter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith("Parser.class");
}
};
*/
/**
* This {@link FileFilter} is used to get all subpackages
* of the parser package.
*/
/*
private static final FileFilter parserDirectoryFilter = new FileFilter() {
public boolean accept(File file) {
return file.isDirectory();
}
};
*/
/**
* Initializing the
* @see #initMediaExt(String)
*/
static {
final String apps = "sit,hqx,img,dmg,exe,com,bat,sh,vbs,zip,jar";
final String audio = "mp2,mp3,ogg,aac,aif,aiff,wav";
final String video = "swf,avi,wmv,rm,mov,mpg,mpeg,ram,m4v";
final String image = "jpg,jpeg,jpe,gif,png,ico,bmp";
initMediaExt(extString2extList(
apps + "," + // application container
"tar,gz,bz2,arj,zip,rar," + // archive formats
"ps,xls,ppt,asf," + // text formats without support
audio + "," + // audio formats
video + "," + // video formats
image // image formats
));
initImageExt(extString2extList(image)); // image formats
initAudioExt(extString2extList(audio)); // audio formats
initVideoExt(extString2extList(video)); // video formats
initAppsExt(extString2extList(apps)); // application formats
/* ===================================================
* loading a list of available parsers
* =================================================== */
loadAvailableParserList();
}
private final serverLog theLogger = new serverLog("PARSER");
public serverLog getLogger() {
return this.theLogger;
}
public static HashMap<String, plasmaParserConfig> getParserConfigList() {
return parserConfigList;
}
/**
* This function is used to initialize the HTMLParsableMimeTypes List.
* This list contains a list of mimeTypes that can be parsed in realtime by
* the yacy html-Parser
* @param htmlParsableMimeTypes a list of mimetypes that can be parsed by the
* yacy html parser
*/
public static void initHTMLParsableMimeTypes(final String htmlParsableMimeTypes) {
final LinkedList<String> mimeTypes = new LinkedList<String>();
if ((htmlParsableMimeTypes == null) || (htmlParsableMimeTypes.length() == 0)) {
return;
}
final String[] realtimeParsableMimeTypeList = htmlParsableMimeTypes.split(",");
for (int i = 0; i < realtimeParsableMimeTypeList.length; i++) {
mimeTypes.add(realtimeParsableMimeTypeList[i].toLowerCase().trim());
}
synchronized (supportedHTMLMimeTypes) {
supportedHTMLMimeTypes.clear();
supportedHTMLMimeTypes.addAll(mimeTypes);
}
}
public static List<String> extString2extList(final String extString) {
final LinkedList<String> extensions = new LinkedList<String>();
if ((extString == null) || (extString.length() == 0)) {
return extensions;
}
final String[] xs = extString.split(",");
for (int i = 0; i < xs.length; i++) extensions.add(xs[i].toLowerCase().trim());
return extensions;
}
public static void initMediaExt(final List<String> mediaExtList) {
synchronized (mediaExtSet) {
mediaExtSet.clear();
mediaExtSet.addAll(mediaExtList);
}
}
public static void initImageExt(final List<String> imageExtList) {
synchronized (imageExtSet) {
imageExtSet.clear();
imageExtSet.addAll(imageExtList);
}
}
public static void initAudioExt(final List<String> audioExtList) {
synchronized (audioExtSet) {
audioExtSet.clear();
audioExtSet.addAll(audioExtList);
}
}
public static void initVideoExt(final List<String> videoExtList) {
synchronized (videoExtSet) {
videoExtSet.clear();
videoExtSet.addAll(videoExtList);
}
}
public static void initAppsExt(final List<String> appsExtList) {
synchronized (appsExtSet) {
appsExtSet.clear();
appsExtSet.addAll(appsExtList);
}
}
public static String getMediaExtList() {
synchronized (mediaExtSet) {
return mediaExtSet.toString();
}
}
public static void initSupportedHTMLFileExt(final List<String> supportedRealtimeFileExtList) {
synchronized (supportedHTMLFileExt) {
supportedHTMLFileExt.clear();
supportedHTMLFileExt.addAll(supportedRealtimeFileExtList);
}
}
public static boolean HTMLParsableMimeTypesContains(String mimeType) {
mimeType = normalizeMimeType(mimeType);
synchronized (supportedHTMLMimeTypes) {
return supportedHTMLMimeTypes.contains(mimeType);
}
}
public static boolean supportedHTMLContent(final yacyURL url, final String mimeType) {
return HTMLParsableMimeTypesContains(mimeType) && supportedHTMLFileExtContains(url);
}
public static boolean supportedHTMLFileExtContains(final yacyURL url) {
final String fileExt = getFileExt(url);
synchronized (supportedHTMLFileExt) {
return supportedHTMLFileExt.contains(fileExt);
}
}
public static String getFileExt(final yacyURL url) {
// getting the file path
String name = url.getPath();
// tetermining last position of / in the file path
int p = name.lastIndexOf('/');
if (p != -1) {
name = name.substring(p);
}
// termining last position of . in file path
p = name.lastIndexOf('.');
if (p < 0) return "";
return name.substring(p + 1);
}
public static boolean mediaExtContains(String mediaExt) {
if (mediaExt == null) return false;
mediaExt = mediaExt.trim().toLowerCase();
synchronized (supportedHTMLFileExt) {
if (supportedHTMLFileExt.contains(mediaExt)) return false;
}
if (supportedFileExtContains(mediaExt)) return false;
synchronized (mediaExtSet) {
return mediaExtSet.contains(mediaExt);
}
}
public static boolean imageExtContains(final String imageExt) {
if (imageExt == null) return false;
synchronized (imageExtSet) {
return imageExtSet.contains(imageExt.trim().toLowerCase());
}
}
public static boolean audioExtContains(final String audioExt) {
if (audioExt == null) return false;
synchronized (audioExtSet) {
return audioExtSet.contains(audioExt.trim().toLowerCase());
}
}
public static boolean videoExtContains(final String videoExt) {
if (videoExt == null) return false;
synchronized (videoExtSet) {
return videoExtSet.contains(videoExt.trim().toLowerCase());
}
}
public static boolean appsExtContains(final String appsExt) {
if (appsExt == null) return false;
synchronized (appsExtSet) {
return appsExtSet.contains(appsExt.trim().toLowerCase());
}
}
/**
* some html authors use wrong encoding names, either because they don't know exactly what they
* are doing or they produce a type. Many times, the upper/downcase scheme of the name is fuzzy
* This method patches wrong encoding names. The correct names are taken from
* http://www.iana.org/assignments/character-sets
* @param encoding
* @return patched encoding name
*/
public static String patchCharsetEncoding(String encoding) {
// return the system default encoding
if ((encoding == null) || (encoding.length() < 3)) return Charset.defaultCharset().name();
// trim encoding string
encoding = encoding.trim();
// fix upper/lowercase
encoding = encoding.toUpperCase();
if (encoding.startsWith("SHIFT")) return "Shift_JIS";
if (encoding.startsWith("BIG")) return "Big5";
// all other names but such with "windows" use uppercase
if (encoding.startsWith("WINDOWS")) encoding = "windows" + encoding.substring(7);
if (encoding.startsWith("MACINTOSH")) encoding = "MacRoman";
// fix wrong fill characters
encoding = encoding.replaceAll("_", "-");
if (encoding.matches("GB[_-]?2312([-_]80)?")) return "GB2312";
if (encoding.matches(".*UTF[-_]?8.*")) return "UTF-8";
if (encoding.startsWith("US")) return "US-ASCII";
if (encoding.startsWith("KOI")) return "KOI8-R";
// patch missing '-'
if (encoding.startsWith("windows") && encoding.length() > 7) {
final char c = encoding.charAt(7);
if ((c >= '0') && (c <= '9')) {
encoding = "windows-" + encoding.substring(7);
}
}
if (encoding.startsWith("ISO")) {
// patch typos
if (encoding.length() > 3) {
final char c = encoding.charAt(3);
if ((c >= '0') && (c <= '9')) {
encoding = "ISO-" + encoding.substring(3);
}
}
if (encoding.length() > 8) {
final char c = encoding.charAt(8);
if ((c >= '0') && (c <= '9')) {
encoding = encoding.substring(0, 8) + "-" + encoding.substring(8);
}
}
}
// patch wrong name
if (encoding.startsWith("ISO-8559")) {
// popular typo
encoding = "ISO-8859" + encoding.substring(8);
}
// converting cp\d{4} -> windows-\d{4}
if (encoding.matches("CP([_-])?125[0-8]")) {
final char c = encoding.charAt(2);
if ((c >= '0') && (c <= '9')) {
encoding = "windows-" + encoding.substring(2);
} else {
encoding = "windows" + encoding.substring(2);
}
}
return encoding;
}
public static String normalizeMimeType(String mimeType) {
//if (mimeType == null) doMimeTypeAnalysis
if (mimeType == null) mimeType = "application/octet-stream";
mimeType = mimeType.trim().toLowerCase();
final int pos = mimeType.indexOf(';');
return ((pos < 0) ? mimeType : mimeType.substring(0, pos));
}
public static String getMimeTypeByFileExt(final String fileExt) {
return mimeTypeLookupByFileExt.getProperty(fileExt,"application/octet-stream");
}
public HashMap<String, ParserInfo> getAvailableParserList() {
return plasmaParser.availableParserList;
}
private static void loadAvailableParserList() {
try {
plasmaParser.availableParserList.clear();
// getting the current java classpath
final String javaClassPath = System.getProperty("java.class.path");
// getting the current package name
final String plasmaParserPkgName = plasmaParser.class.getPackage().getName() + ".parser";
serverLog.logInfo("PARSER","Searching for additional content parsers in package " + plasmaParserPkgName);
// getting an uri to the parser subpackage
final String packageURI = plasmaParser.class.getResource("/"+plasmaParserPkgName.replace('.','/')).toString() + "/";
serverLog.logFine("PARSER", "Parser directory is " + packageURI);
/*
* loop through all subdirectories and test if we can
* find an additional parser class
*/
final ListDirs parserDir = new ListDirs(packageURI);
final ArrayList<String> parserClasses = parserDir.listFiles(".*\\"+ File.separator +"parser\\"+ File.separator +"[^\\"+ File.separator +"]+\\"+ File.separator +"[^\\"+ File.separator +"]+Parser\\.class");
if (parserClasses == null) return;
final Pattern patternGetClassName = Pattern.compile(".*\\"+ File.separator +"([^\\"+ File.separator +"]+)\\.class");
final Pattern patternGetFullClassName = Pattern.compile(".*(\\"+ File.separator +"[^\\"+ File.separator +"]+\\"+ File.separator +"[^\\"+ File.separator +"]+)\\.class");
for (final String parserClassFile: parserClasses) {
serverLog.logFine("PARSER", "Testing parser class " + parserClassFile);
final Matcher matcherClassName = patternGetClassName.matcher(parserClassFile);
matcherClassName.find();
final String className = matcherClassName.group(1);
final Matcher matcherFullClassName = patternGetFullClassName.matcher(parserClassFile);
matcherFullClassName.find();
final String fullClassName = plasmaParserPkgName + matcherFullClassName.group(1).replace(File.separator , ".");
try {
// trying to load the parser class by its name
final Class<?> parserClass = Class.forName(fullClassName);
final Object theParser0 = parserClass.newInstance();
if (!(theParser0 instanceof Parser)) continue;
final Parser theParser = (Parser) theParser0;
// testing if all needed libx libraries are available
final String[] neededLibx = theParser.getLibxDependences();
final StringBuffer neededLibxBuf = new StringBuffer();
if (neededLibx != null) {
for (int libxId=0; libxId < neededLibx.length; libxId++) {
if (javaClassPath.indexOf(neededLibx[libxId]) == -1) {
throw new Exception("Missing dependency detected: '" + neededLibx[libxId] + "'.");
}
neededLibxBuf.append(neededLibx[libxId])
.append(",");
}
if (neededLibxBuf.length()>0) neededLibxBuf.deleteCharAt(neededLibxBuf.length()-1);
}
// loading the list of mime-types that are supported by this parser class
final Hashtable<String, String> supportedMimeTypes = theParser.getSupportedMimeTypes();
// creating a parser info object
final ParserInfo parserInfo = new ParserInfo();
parserInfo.parserClass = parserClass;
parserInfo.parserClassName = fullClassName;
parserInfo.libxDependencies = neededLibx;
parserInfo.supportedMimeTypes = supportedMimeTypes;
parserInfo.parserVersionNr = (theParser).getVersion();
parserInfo.parserName = (theParser).getName();
final Iterator<String> mimeTypeIterator = supportedMimeTypes.keySet().iterator();
while (mimeTypeIterator.hasNext()) {
final String mimeType = mimeTypeIterator.next();
availableParserList.put(mimeType, parserInfo);
serverLog.logInfo("PARSER", "Found functional parser for mimeType '" + mimeType + "'." +
"\n\tName: " + parserInfo.parserName +
"\n\tVersion: " + parserInfo.parserVersionNr +
"\n\tClass: " + parserInfo.parserClassName +
((neededLibxBuf.length()>0)?"\n\tDependencies: " + neededLibxBuf.toString():""));
}
} catch (final Exception e) { /* we can ignore this for the moment */
serverLog.logWarning("PARSER", "Parser '" + className + "' doesn't work correctly and will be ignored.\n [" + e.getClass().getName() + "]: " + e.getMessage());
e.printStackTrace();
} catch (final Error e) { /* we can ignore this for the moment */
serverLog.logWarning("PARSER", "Parser '" + className + "' doesn't work correctly and will be ignored.\n [" + e.getClass().getName() + "]: " + e.getMessage());
e.printStackTrace();
}
}
} catch (final Exception e) {
serverLog.logSevere("PARSER", "Unable to determine all installed parsers. " + e.toString());
}
}
public void close() {
// clearing the parser list
final Iterator<plasmaParserConfig> configs = parserConfigList.values().iterator();
while (configs.hasNext()) {
final plasmaParserConfig currentConfig = configs.next();
synchronized (currentConfig.enabledParserList) {
currentConfig.enabledParserList.clear();
}
}
}
public plasmaParserDocument parseSource(final yacyURL location, final String mimeType, final String charset, final byte[] sourceArray)
throws InterruptedException, ParserException {
ByteArrayInputStream byteIn = null;
try {
if (this.theLogger.isFine())
this.theLogger.logFine("Parsing '" + location + "' from byte-array");
// testing if the resource is not empty
if (sourceArray == null || sourceArray.length == 0) {
final String errorMsg = "No resource content available (1) " + ((sourceArray == null) ? "source == null" : "source.length() == 0");
this.theLogger.logInfo("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location, errorMsg);
}
// creating an InputStream
byteIn = new ByteArrayInputStream(sourceArray);
// parsing the temp file
return parseSource(location, mimeType, charset, sourceArray.length, byteIn);
} catch (final Exception e) {
// Interrupted- and Parser-Exceptions should pass through
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof ParserException) throw (ParserException) e;
// log unexpected error
this.theLogger.logSevere("Unexpected exception in parseSource from byte-array: " + e.getMessage(), e);
throw new ParserException("Unexpected exception while parsing " + location,location, e);
} finally {
if (byteIn != null) try { byteIn.close(); } catch (final Exception ex){/* ignore this */}
}
}
public plasmaParserDocument parseSource(final yacyURL location, final String theMimeType, final String theDocumentCharset, final File sourceFile) throws InterruptedException, ParserException {
BufferedInputStream sourceStream = null;
try {
if (this.theLogger.isFine())
this.theLogger.logFine("Parsing '" + location + "' from file");
// testing if the resource is not empty
if (!(sourceFile.exists() && sourceFile.canRead() && sourceFile.length() > 0)) {
final String errorMsg = sourceFile.exists() ? "Empty resource file." : "No resource content available (2).";
this.theLogger.logInfo("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location, "document has no content");
}
// create a new InputStream
sourceStream = new BufferedInputStream(new FileInputStream(sourceFile));
// parsing the data
return this.parseSource(location, theMimeType, theDocumentCharset, sourceFile.length(), sourceStream);
} catch (final Exception e) {
// Interrupted- and Parser-Exceptions should pass through
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof ParserException) throw (ParserException) e;
// log unexpected error
this.theLogger.logSevere("Unexpected exception in parseSource from File: " + e.getMessage(), e);
throw new ParserException("Unexpected exception while parsing " + location,location, e);
} finally {
if (sourceStream != null) try { sourceStream.close(); } catch (final Exception ex){/* ignore this */}
}
}
/**
* To parse a resource from an {@link InputStream}
* @param location the URL of the resource
* @param theMimeType the resource mimetype (<code>null</code> if unknown)
* @param theDocumentCharset the charset of the resource (<code>null</code> if unknown)
* @param contentLength the content length of the resource (<code>-1</code> if unknown)
* @param sourceStream an {@link InputStream} containing the resource body
* @return the parsed {@link plasmaParserDocument document}
* @throws InterruptedException
* @throws ParserException
*/
public plasmaParserDocument parseSource(final yacyURL location, final String theMimeType, final String theDocumentCharset, final long contentLength, final InputStream sourceStream) throws InterruptedException, ParserException {
Parser theParser = null;
String mimeType = null;
try {
if (this.theLogger.isFine())
this.theLogger.logFine("Parsing '" + location + "' from stream");
// getting the mimetype of the document
mimeType = normalizeMimeType(theMimeType);
// getting the file extension of the document
final String fileExt = getFileExt(location);
// getting the charset of the document
// TODO: do a charset detection here ....
final String documentCharset = patchCharsetEncoding(theDocumentCharset);
// testing if parsing is supported for this resource
if (!plasmaParser.supportedContent(location,mimeType)) {
final String errorMsg = "No parser available to parse mimetype '" + mimeType + "'";
this.theLogger.logInfo("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location, "wrong mime type or wrong extension");
}
if (this.theLogger.isFine())
this.theLogger.logInfo("Parsing " + location + " with mimeType '" + mimeType +
"' and file extension '" + fileExt + "'.");
// getting the correct parser for the given mimeType
theParser = this.getParser(mimeType);
// if a parser was found we use it ...
plasmaParserDocument doc = null;
if (theParser != null) {
// set the content length of the resource
theParser.setContentLength(contentLength);
// parse the resource
doc = theParser.parse(location, mimeType,documentCharset,sourceStream);
} else if (HTMLParsableMimeTypesContains(mimeType)) {
doc = parseHtml(location, mimeType, documentCharset, sourceStream);
} else {
final String errorMsg = "No parser available to parse mimetype '" + mimeType + "'";
this.theLogger.logInfo("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location, "wrong mime type or wrong extension");
}
// check result
if (doc == null) {
final String errorMsg = "Unexpected error. Parser returned null.";
this.theLogger.logInfo("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location);
}
return doc;
} catch (final UnsupportedEncodingException e) {
final String errorMsg = "unsupported charset encoding: " + e.getMessage();
this.theLogger.logSevere("Unable to parse '" + location + "'. " + errorMsg, e);
throw new ParserException(errorMsg,location, errorMsg);
} catch (final Exception e) {
// Interrupted- and Parser-Exceptions should pass through
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof ParserException) throw (ParserException) e;
// log unexpected error
final String errorMsg = "Unexpected exception. " + e.getMessage();
this.theLogger.logSevere("Unable to parse '" + location + "'. " + errorMsg, e);
throw new ParserException(errorMsg,location,e);
} finally {
if (theParser != null) {
theParser = null; // delete object
}
}
}
private plasmaParserDocument parseHtml(final yacyURL location, final String mimeType, final String documentCharset, final InputStream sourceStream) throws IOException, ParserException {
// make a scraper and transformer
final htmlFilterInputStream htmlFilter = new htmlFilterInputStream(sourceStream,documentCharset,location,null,false);
String charset = htmlFilter.detectCharset();
if (charset == null) {
charset = documentCharset;
} else {
charset = patchCharsetEncoding(charset);
}
if (!documentCharset.equalsIgnoreCase(charset)) {
this.theLogger.logInfo("Charset transformation needed from '" + documentCharset + "' to '" + charset + "' for URL = " + location.toNormalform(true, true));
}
// parsing the content
final htmlFilterContentScraper scraper = new htmlFilterContentScraper(location);
final htmlFilterWriter writer = new htmlFilterWriter(null,null,scraper,null,false);
serverFileUtils.copy(htmlFilter, writer, Charset.forName(charset));
writer.close();
//OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);
//serverFileUtils.copy(sourceFile, hfos);
//hfos.close();
if (writer.binarySuspect()) {
final String errorMsg = "Binary data found in resource";
this.theLogger.logSevere("Unable to parse '" + location + "'. " + errorMsg);
throw new ParserException(errorMsg,location);
}
return transformScraper(location, mimeType, documentCharset, scraper);
}
public plasmaParserDocument transformScraper(final yacyURL location, final String mimeType, final String charSet, final htmlFilterContentScraper scraper) {
final String[] sections = new String[scraper.getHeadlines(1).length + scraper.getHeadlines(2).length + scraper.getHeadlines(3).length + scraper.getHeadlines(4).length];
int p = 0;
for (int i = 1; i <= 4; i++) for (int j = 0; j < scraper.getHeadlines(i).length; j++) sections[p++] = scraper.getHeadlines(i)[j];
final plasmaParserDocument ppd = new plasmaParserDocument(
location,
mimeType,
charSet,
scraper.getContentLanguages(),
scraper.getKeywords(),
scraper.getTitle(),
scraper.getAuthor(),
sections,
scraper.getDescription(),
scraper.getText(),
scraper.getAnchors(),
scraper.getImages());
//scraper.close();
ppd.setFavicon(scraper.getFavicon());
return ppd;
}
/**
* This function is used to determine the parser class that should be used for a given
* mimetype ...
* @param mimeType MIME-Type of the resource
* @return the {@link Parser}-class that is supposed to parse the resource of
* the given MIME-Type
*/
private Parser getParser(String mimeType) {
mimeType = normalizeMimeType(mimeType);
try {
// determining the proper parser class name for the mimeType
String parserClassName = null;
ParserInfo parserInfo = null;
synchronized (plasmaParser.availableParserList) {
if (plasmaParser.availableParserList.containsKey(mimeType)) {
parserInfo = plasmaParser.availableParserList.get(mimeType);
parserClassName = parserInfo.parserClassName;
} else {
return null;
}
}
// fetching a new parser object from pool
final Parser theParser = makeParser(parserClassName);
// checking if the created parser really supports the given mimetype
final Hashtable<String, String> supportedMimeTypes = theParser.getSupportedMimeTypes();
if ((supportedMimeTypes != null) && (supportedMimeTypes.containsKey(mimeType))) {
parserInfo.incUsageCounter();
return theParser;
}
} catch (final Exception e) {
System.err.println("ERROR: Unable to load the correct parser for type " + mimeType);
}
return null;
}
static Map<yacyURL, String> allReflinks(final Collection<?> links) {
// links is either a Set of Strings (with urls) or htmlFilterImageEntries
// we find all links that are part of a reference inside a url
final HashMap<yacyURL, String> v = new HashMap<yacyURL, String>();
final Iterator<?> i = links.iterator();
Object o;
yacyURL url;
String u;
int pos;
loop: while (i.hasNext()) try {
o = i.next();
if (o instanceof yacyURL) url = (yacyURL) o;
else if (o instanceof String) url = new yacyURL((String) o, null);
else if (o instanceof htmlFilterImageEntry) url = ((htmlFilterImageEntry) o).url();
else {
assert false;
continue;
}
u = url.toNormalform(true, true);
if ((pos = u.toLowerCase().indexOf("http://",7)) > 0) {
i.remove();
u = u.substring(pos);
while ((pos = u.toLowerCase().indexOf("http://",7)) > 0) u = u.substring(pos);
url = new yacyURL(u, null);
if (!(v.containsKey(url))) v.put(url, "ref");
continue loop;
}
if ((pos = u.toLowerCase().indexOf("/www.",7)) > 0) {
i.remove();
u = "http:/" + u.substring(pos);
while ((pos = u.toLowerCase().indexOf("/www.",7)) > 0) u = "http:/" + u.substring(pos);
url = new yacyURL(u, null);
if (!(v.containsKey(url))) v.put(url, "ref");
continue loop;
}
} catch (final MalformedURLException e) {}
return v;
}
static Map<yacyURL, String> allSubpaths(final Collection<?> links) {
// links is either a Set of Strings (urls) or a Set of htmlFilterImageEntries
final HashSet<String> h = new HashSet<String>();
Iterator<?> i = links.iterator();
Object o;
yacyURL url;
String u;
int pos;
int l;
while (i.hasNext()) try {
o = i.next();
if (o instanceof yacyURL) url = (yacyURL) o;
else if (o instanceof String) url = new yacyURL((String) o, null);
else if (o instanceof htmlFilterImageEntry) url = ((htmlFilterImageEntry) o).url();
else {
assert false;
continue;
}
u = url.toNormalform(true, true);
if (u.endsWith("/")) u = u.substring(0, u.length() - 1);
pos = u.lastIndexOf('/');
while (pos > 8) {
l = u.length();
u = u.substring(0, pos + 1);
h.add(u);
u = u.substring(0, pos);
assert (u.length() < l) : "u = " + u;
pos = u.lastIndexOf('/');
}
} catch (final MalformedURLException e) {}
// now convert the strings to yacyURLs
i = h.iterator();
final HashMap<yacyURL, String> v = new HashMap<yacyURL, String>();
while (i.hasNext()) {
u = (String) i.next();
try {
url = new yacyURL(u, null);
v.put(url, "sub");
} catch (final MalformedURLException e) {}
}
return v;
}
public static void main(final String[] args) {
//javac -sourcepath source source/de/anomic/plasma/plasmaParser.java
//java -cp source de.anomic.plasma.plasmaParser bug.html bug.out
try {
Object content = null;
yacyURL contentURL = null;
long contentLength = -1;
String contentMimeType = "application/octet-stream";
String charSet = "utf-8";
if (args.length < 2) {
System.err.println("Usage: java de.anomic.plasma.plasmaParser (-f filename|-u URL) [-m mimeType]");
}
final String mode = args[0];
JakartaCommonsHttpResponse res = null;
plasmaParserDocument document = null;
try { // close InputStream when done
if (mode.equalsIgnoreCase("-f")) {
content = new File(args[1]);
contentURL = new yacyURL((File)content);
} else if (mode.equalsIgnoreCase("-u")) {
contentURL = new yacyURL(args[1], null);
// downloading the document content
final JakartaCommonsHttpClient client = new JakartaCommonsHttpClient(5000);
res = client.GET(args[1]);
if (res.getStatusCode() != 200) {
System.err.println("Unable to download " + contentURL + ". " + res.getStatusLine());
return;
}
content = res.getDataAsStream();
contentMimeType = res.getResponseHeader().mime();
charSet = res.getResponseHeader().getCharacterEncoding();
contentLength = res.getResponseHeader().getContentLength();
}
if ((args.length >= 4)&&(args[2].equalsIgnoreCase("-m"))) {
contentMimeType = args[3];
}
if ((args.length >= 6)&&(args[4].equalsIgnoreCase("-c"))) {
charSet = args[5];
}
// creating a plasma parser
final plasmaParser theParser = new plasmaParser();
// configuring the html parsable mimeTypes
plasmaParser.initHTMLParsableMimeTypes("application/xhtml+xml,text/html,text/plain,text/sgml");
// parsing the content
if (content instanceof byte[]) {
document = theParser.parseSource(contentURL, contentMimeType, charSet, (byte[])content);
} else if (content instanceof File) {
document = theParser.parseSource(contentURL, contentMimeType, charSet, (File)content);
} else if (content instanceof InputStream) {
document = theParser.parseSource(contentURL, contentMimeType, charSet, contentLength, (InputStream)content);
}
} finally {
if(res != null) {
res.closeStream();
}
}
// printing out all parsed sentences
if (document != null) {
System.out.print("Document titel: ");
System.out.println(document.dc_title());
// found text
final Iterator<StringBuffer> sentences = document.getSentences(false);
int i = 0;
if (sentences != null) while (sentences.hasNext()) {
System.out.print("line " + i + ": ");
System.out.println(sentences.next().toString());
i++;
}
// found links
int anchorNr = 0;
final Map<yacyURL, String> anchors = document.getAnchors();
for (Entry<yacyURL, String> anchor: anchors.entrySet()) {
final yacyURL key = anchor.getKey();
System.out.println("URL " + anchorNr + ":\t" + key.toString() + " | " + anchor.getValue());
anchorNr++;
}
document.close();
}
} catch (final Exception e) {
e.printStackTrace();
}
}
public static boolean supportedContent(final yacyURL url, final String mimeType) {
if (url == null) throw new NullPointerException();
final Iterator<plasmaParserConfig> configs = parserConfigList.values().iterator();
while (configs.hasNext()) {
final plasmaParserConfig currentConfig = configs.next();
synchronized (currentConfig.enabledParserList) {
if (currentConfig.supportedContent(url, mimeType)) return true;
}
}
return false;
}
public static boolean supportedContent(final String parserMode, final yacyURL url, final String mimeType) {
if (!PARSER_MODE.contains(parserMode)) throw new IllegalArgumentException();
if (url == null) throw new NullPointerException();
if (parserMode.equals(PARSER_MODE_IMAGE)) return true;
final plasmaParserConfig config = parserConfigList.get(parserMode);
return (config == null)?false:config.supportedContent(url, mimeType);
}
public static void initParseableMimeTypes(final String parserMode, final String configStr) {
if (!PARSER_MODE.contains(parserMode)) throw new IllegalArgumentException();
plasmaParserConfig config = parserConfigList.get(parserMode);
if (config == null) {
config = new plasmaParserConfig(parserMode);
parserConfigList.put(parserMode, config);
}
config.initParseableMimeTypes(configStr);
}
public static String[] setEnabledParserList(final String parserMode, final Set<String> mimeTypeSet) {
if (!PARSER_MODE.contains(parserMode)) throw new IllegalArgumentException();
plasmaParserConfig config = parserConfigList.get(parserMode);
if (config == null) {
config = new plasmaParserConfig(parserMode);
parserConfigList.put(parserMode, config);
}
return config.setEnabledParserList(mimeTypeSet);
}
public static boolean supportedFileExtContains(final String fileExt) {
final Iterator<plasmaParserConfig> configs = parserConfigList.values().iterator();
while (configs.hasNext()) {
final plasmaParserConfig currentConfig = configs.next();
synchronized (currentConfig.enabledParserList) {
if (currentConfig.supportedFileExtContains(fileExt)) return true;
}
}
return false;
}
public static boolean supportedMimeTypesContains(final String mimeType) {
final Iterator<plasmaParserConfig> configs = parserConfigList.values().iterator();
while (configs.hasNext()) {
final plasmaParserConfig currentConfig = configs.next();
synchronized (currentConfig.enabledParserList) {
if (currentConfig.supportedMimeTypesContains(mimeType)) return true;
}
}
return false;
}
public static Parser makeParser(final Object name) throws Exception {
if (!(name instanceof String))
throw new IllegalArgumentException("The object key must be of type string.");
// loading class by name
final Class<?> moduleClass = Class.forName((String)name);
// instantiating class
final Parser theParser = (Parser) moduleClass.newInstance();
// setting logger that should by used
final String parserShortName = ((String)name).substring("de.anomic.plasma.parser.".length(),((String)name).lastIndexOf("."));
final serverLog theLogger = new serverLog("PARSER." + parserShortName.toUpperCase());
theParser.setLogger(theLogger);
return theParser;
}
}
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