You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
376 lines
16 KiB
376 lines
16 KiB
// Parser.java
|
|
// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 09.07.2009 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate: 2009-03-20 16:44:59 +0100 (Fr, 20 Mrz 2009) $
|
|
// $LastChangedRevision: 5736 $
|
|
// $LastChangedBy: borg-0300 $
|
|
//
|
|
// 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 net.yacy.document;
|
|
|
|
import java.io.BufferedInputStream;
|
|
import java.io.ByteArrayInputStream;
|
|
import java.io.File;
|
|
import java.io.FileInputStream;
|
|
import java.io.InputStream;
|
|
import java.text.Collator;
|
|
import java.util.ArrayList;
|
|
import java.util.HashSet;
|
|
import java.util.List;
|
|
import java.util.Locale;
|
|
import java.util.Map;
|
|
import java.util.Set;
|
|
import java.util.TreeMap;
|
|
import java.util.TreeSet;
|
|
|
|
import net.yacy.document.parser.bzipParser;
|
|
import net.yacy.document.parser.csvParser;
|
|
import net.yacy.document.parser.docParser;
|
|
import net.yacy.document.parser.gzipParser;
|
|
import net.yacy.document.parser.htmlParser;
|
|
import net.yacy.document.parser.odtParser;
|
|
import net.yacy.document.parser.ooxmlParser;
|
|
import net.yacy.document.parser.pdfParser;
|
|
import net.yacy.document.parser.pptParser;
|
|
import net.yacy.document.parser.psParser;
|
|
import net.yacy.document.parser.rssParser;
|
|
import net.yacy.document.parser.rtfParser;
|
|
import net.yacy.document.parser.sevenzipParser;
|
|
import net.yacy.document.parser.swfParser;
|
|
import net.yacy.document.parser.tarParser;
|
|
import net.yacy.document.parser.torrentParser;
|
|
import net.yacy.document.parser.vcfParser;
|
|
import net.yacy.document.parser.vsdParser;
|
|
import net.yacy.document.parser.xlsParser;
|
|
import net.yacy.document.parser.zipParser;
|
|
import net.yacy.document.parser.images.bmpParser;
|
|
import net.yacy.document.parser.images.genericImageParser;
|
|
import net.yacy.kelondro.data.meta.DigestURI;
|
|
import net.yacy.kelondro.logging.Log;
|
|
|
|
|
|
public final class TextParser {
|
|
|
|
private static final Log log = new Log("PARSER");
|
|
|
|
// use a collator to relax when distinguishing between lowercase und uppercase letters
|
|
private static final Collator insensitiveCollator = Collator.getInstance(Locale.US);
|
|
static {
|
|
insensitiveCollator.setStrength(Collator.SECONDARY);
|
|
insensitiveCollator.setDecomposition(Collator.NO_DECOMPOSITION);
|
|
}
|
|
|
|
private static final Map<String, Idiom> mime2parser = new TreeMap<String, Idiom>(insensitiveCollator);
|
|
private static final Map<String, Idiom> ext2parser = new TreeMap<String, Idiom>(insensitiveCollator);
|
|
private static final Map<String, String> ext2mime = new TreeMap<String, String>(insensitiveCollator);
|
|
private static final Set<String> denyMime = new TreeSet<String>(insensitiveCollator);
|
|
private static final Set<String> denyExtension = new TreeSet<String>(insensitiveCollator);
|
|
|
|
static {
|
|
initParser(new bmpParser());
|
|
initParser(new bzipParser());
|
|
initParser(new csvParser());
|
|
initParser(new docParser());
|
|
initParser(new gzipParser());
|
|
initParser(new htmlParser());
|
|
initParser(new genericImageParser());
|
|
initParser(new odtParser());
|
|
initParser(new ooxmlParser());
|
|
initParser(new pdfParser());
|
|
initParser(new pptParser());
|
|
initParser(new psParser());
|
|
initParser(new rssParser());
|
|
initParser(new rtfParser());
|
|
initParser(new sevenzipParser());
|
|
initParser(new swfParser());
|
|
initParser(new tarParser());
|
|
initParser(new torrentParser());
|
|
initParser(new vcfParser());
|
|
initParser(new vsdParser());
|
|
initParser(new xlsParser());
|
|
initParser(new zipParser());
|
|
}
|
|
|
|
public static Set<Idiom> idioms() {
|
|
Set<Idiom> c = new HashSet<Idiom>();
|
|
c.addAll(ext2parser.values());
|
|
c.addAll(mime2parser.values());
|
|
return c;
|
|
}
|
|
|
|
private static void initParser(Idiom parser) {
|
|
String prototypeMime = null;
|
|
for (String mime: parser.supportedMimeTypes()) {
|
|
// process the mime types
|
|
final String mimeType = normalizeMimeType(mime);
|
|
if (prototypeMime == null) prototypeMime = mimeType;
|
|
Idiom p0 = mime2parser.get(mimeType);
|
|
if (p0 != null) log.logSevere("parser for mime '" + mimeType + "' was set to '" + p0.getName() + "', overwriting with new parser '" + parser.getName() + "'.");
|
|
mime2parser.put(mimeType, parser);
|
|
Log.logInfo("PARSER", "Parser for mime type '" + mimeType + "': " + parser.getName());
|
|
}
|
|
|
|
if (prototypeMime != null) for (String ext: parser.supportedExtensions()) {
|
|
String s = ext2mime.get(ext);
|
|
if (s != null) log.logSevere("parser for extension '" + ext + "' was set to mime '" + s + "', overwriting with new mime '" + prototypeMime + "'.");
|
|
ext2mime.put(ext, prototypeMime);
|
|
}
|
|
|
|
for (String ext: parser.supportedExtensions()) {
|
|
// process the extensions
|
|
Idiom p0 = ext2parser.get(ext);
|
|
if (p0 != null) log.logSevere("parser for extension '" + ext + "' was set to '" + p0.getName() + "', overwriting with new parser '" + parser.getName() + "'.");
|
|
ext2parser.put(ext, parser);
|
|
Log.logInfo("PARSER", "Parser for extension '" + ext + "': " + parser.getName());
|
|
}
|
|
|
|
}
|
|
|
|
public static Document parseSource(
|
|
final DigestURI location,
|
|
final String mimeType,
|
|
final String charset,
|
|
final byte[] sourceArray
|
|
) throws InterruptedException, ParserException {
|
|
|
|
ByteArrayInputStream byteIn = null;
|
|
try {
|
|
if (log.isFine()) log.logFine("Parsing '" + location + "' from byte-array");
|
|
if (sourceArray == null || sourceArray.length == 0) {
|
|
final String errorMsg = "No resource content available (1) " + (((sourceArray == null) ? "source == null" : "source.length() == 0") + ", url = " + location.toNormalform(true, false));
|
|
log.logInfo("Unable to parse '" + location + "'. " + errorMsg);
|
|
throw new ParserException(errorMsg, location);
|
|
}
|
|
byteIn = new ByteArrayInputStream(sourceArray);
|
|
return parseSource(location, mimeType, charset, sourceArray.length, byteIn);
|
|
} catch (final Exception e) {
|
|
if (e instanceof InterruptedException) throw (InterruptedException) e;
|
|
if (e instanceof ParserException) throw (ParserException) e;
|
|
log.logSevere("Unexpected exception in parseSource from byte-array: " + e.getMessage(), e);
|
|
throw new ParserException("Unexpected exception: " + e.getMessage(), location);
|
|
} finally {
|
|
if (byteIn != null) try {
|
|
byteIn.close();
|
|
} catch (final Exception ex) { }
|
|
}
|
|
}
|
|
|
|
public static Document parseSource(
|
|
final DigestURI location,
|
|
final String mimeType,
|
|
final String charset,
|
|
final File sourceFile
|
|
) throws InterruptedException, ParserException {
|
|
|
|
BufferedInputStream sourceStream = null;
|
|
try {
|
|
if (log.isFine()) log.logFine("Parsing '" + location + "' from file");
|
|
if (!sourceFile.exists() || !sourceFile.canRead() || sourceFile.length() == 0) {
|
|
final String errorMsg = sourceFile.exists() ? "Empty resource file." : "No resource content available (2).";
|
|
log.logInfo("Unable to parse '" + location + "'. " + errorMsg);
|
|
throw new ParserException(errorMsg, location);
|
|
}
|
|
sourceStream = new BufferedInputStream(new FileInputStream(sourceFile));
|
|
return parseSource(location, mimeType, charset, sourceFile.length(), sourceStream);
|
|
} catch (final Exception e) {
|
|
if (e instanceof InterruptedException) throw (InterruptedException) e;
|
|
if (e instanceof ParserException) throw (ParserException) e;
|
|
log.logSevere("Unexpected exception in parseSource from File: " + e.getMessage(), e);
|
|
throw new ParserException("Unexpected exception: " + e.getMessage(), location);
|
|
} finally {
|
|
if (sourceStream != null)try {
|
|
sourceStream.close();
|
|
} catch (final Exception ex) {}
|
|
}
|
|
}
|
|
|
|
public static Document parseSource(
|
|
final DigestURI location,
|
|
String mimeType,
|
|
final String charset,
|
|
final long contentLength,
|
|
final InputStream sourceStream
|
|
) throws InterruptedException, ParserException {
|
|
if (log.isFine()) log.logFine("Parsing '" + location + "' from stream");
|
|
mimeType = normalizeMimeType(mimeType);
|
|
final String fileExt = location.getFileExtension();
|
|
final String documentCharset = htmlParser.patchCharsetEncoding(charset);
|
|
List<Idiom> idioms = idiomParser(location, mimeType);
|
|
|
|
if (idioms.isEmpty()) {
|
|
final String errorMsg = "No parser available to parse extension '" + location.getFileExtension() + "' or mimetype '" + mimeType + "'";
|
|
log.logInfo("Unable to parse '" + location + "'. " + errorMsg);
|
|
throw new ParserException(errorMsg, location);
|
|
}
|
|
|
|
if (log.isFine()) log.logInfo("Parsing " + location + " with mimeType '" + mimeType + "' and file extension '" + fileExt + "'.");
|
|
|
|
Document doc = null;
|
|
for (Idiom parser: idioms) {
|
|
parser.setContentLength(contentLength);
|
|
try {
|
|
doc = parser.parse(location, mimeType, documentCharset, sourceStream);
|
|
} catch (ParserException e) {
|
|
log.logWarning("tried parser '" + parser.getName() + "' to parse " + location.toNormalform(true, false) + " but failed: " + e.getMessage(), e);
|
|
}
|
|
if (doc != null) break;
|
|
}
|
|
|
|
if (doc == null) {
|
|
final String errorMsg = "Parsing content with file extension '" + location.getFileExtension() + "' and mimetype '" + mimeType + "' failed.";
|
|
log.logWarning("Unable to parse '" + location + "'. " + errorMsg);
|
|
throw new ParserException(errorMsg, location);
|
|
}
|
|
return doc;
|
|
}
|
|
|
|
/**
|
|
* check if the parser supports the given content.
|
|
* @param url
|
|
* @param mimeType
|
|
* @return returns null if the content is supported. If the content is not supported, return a error string.
|
|
*/
|
|
public static String supports(final DigestURI url, String mimeType) {
|
|
try {
|
|
// try to get a parser. If this works, we don't need the parser itself, we just return null to show that everything is ok.
|
|
List<Idiom> idioms = idiomParser(url, mimeType);
|
|
return (idioms == null || idioms.isEmpty()) ? "no parser found" : null;
|
|
} catch (ParserException e) {
|
|
// in case that a parser is not available, return a error string describing the problem.
|
|
return e.getMessage();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* find a parser for a given url and mime type
|
|
* because mime types returned by web severs are sometimes wrong, we also compute the mime type again
|
|
* from the extension that can be extracted from the url path. That means that there are 3 criteria
|
|
* that can be used to select a parser:
|
|
* - the given extension
|
|
* - the given mime type
|
|
* - the mime type computed from the extension
|
|
* @param url the given url
|
|
* @param mimeType the given mime type
|
|
* @return a list of Idiom parsers that may be appropriate for the given criteria
|
|
* @throws ParserException
|
|
*/
|
|
private static List<Idiom> idiomParser(final DigestURI url, String mimeType1) throws ParserException {
|
|
List<Idiom> idioms = new ArrayList<Idiom>(2);
|
|
|
|
// check extension
|
|
String ext = url.getFileExtension();
|
|
Idiom idiom;
|
|
if (ext != null && ext.length() > 0) {
|
|
if (denyExtension.contains(ext)) throw new ParserException("file extension '" + ext + "' is denied (1)", url);
|
|
idiom = ext2parser.get(ext);
|
|
if (idiom != null) idioms.add(idiom);
|
|
}
|
|
|
|
// check given mime type
|
|
if (mimeType1 != null) {
|
|
mimeType1 = normalizeMimeType(mimeType1);
|
|
if (denyMime.contains(mimeType1)) throw new ParserException("mime type '" + mimeType1 + "' is denied (1)", url);
|
|
idiom = mime2parser.get(mimeType1);
|
|
if (idiom != null && !idioms.contains(idiom)) idioms.add(idiom);
|
|
}
|
|
|
|
// check mime type computed from extension
|
|
String mimeType2 = ext2mime.get(ext);
|
|
if (mimeType2 == null || denyMime.contains(mimeType2)) return idioms; // in this case we are a bit more lazy
|
|
idiom = mime2parser.get(mimeType2);
|
|
if (idiom != null && !idioms.contains(idiom)) idioms.add(idiom);
|
|
|
|
return idioms;
|
|
}
|
|
|
|
public static String supportsMime(String mimeType) {
|
|
if (mimeType == null) return null;
|
|
mimeType = normalizeMimeType(mimeType);
|
|
if (denyMime.contains(mimeType)) return "mime type '" + mimeType + "' is denied (2)";
|
|
if (mime2parser.get(mimeType) == null) return "no parser for mime '" + mimeType + "' available";
|
|
return null;
|
|
}
|
|
|
|
public static String supportsExtension(final DigestURI url) {
|
|
String ext = url.getFileExtension();
|
|
if (ext == null || ext.length() == 0) return null;
|
|
if (denyExtension.contains(ext)) return "file extension '" + ext + "' is denied (2)";
|
|
String mimeType = ext2mime.get(ext);
|
|
if (mimeType == null) return "no parser available";
|
|
Idiom idiom = mime2parser.get(mimeType);
|
|
assert idiom != null;
|
|
if (idiom == null) return "no parser available (internal error!)";
|
|
return null;
|
|
}
|
|
|
|
public static String mimeOf(DigestURI url) {
|
|
return mimeOf(url.getFileExtension());
|
|
}
|
|
|
|
public static String mimeOf(String ext) {
|
|
return ext2mime.get(ext);
|
|
}
|
|
|
|
private static String normalizeMimeType(String mimeType) {
|
|
if (mimeType == null) return "application/octet-stream";
|
|
final int pos = mimeType.indexOf(';');
|
|
return ((pos < 0) ? mimeType.trim() : mimeType.substring(0, pos).trim());
|
|
}
|
|
|
|
public static void setDenyMime(String denyList) {
|
|
denyMime.clear();
|
|
String n;
|
|
for (String s: denyList.split(",")) {
|
|
n = normalizeMimeType(s);
|
|
if (n != null && n.length() > 0) denyMime.add(n);
|
|
}
|
|
}
|
|
|
|
public static String getDenyMime() {
|
|
String s = "";
|
|
for (String d: denyMime) s += d + ",";
|
|
s = s.substring(0, s.length() - 1);
|
|
return s;
|
|
}
|
|
|
|
public static void grantMime(String mime, boolean grant) {
|
|
String n = normalizeMimeType(mime);
|
|
if (n == null || n.length() == 0) return;
|
|
if (grant) denyMime.remove(n); else denyMime.add(n);
|
|
}
|
|
|
|
public static void setDenyExtension(String denyList) {
|
|
denyExtension.clear();
|
|
for (String s: denyList.split(",")) denyExtension.add(s);
|
|
}
|
|
|
|
public static String getDenyExtension() {
|
|
String s = "";
|
|
for (String d: denyExtension) s += d + ",";
|
|
s = s.substring(0, s.length() - 1);
|
|
return s;
|
|
}
|
|
|
|
public static void grantExtension(String ext, boolean grant) {
|
|
if (grant) denyExtension.remove(ext); else denyExtension.add(ext);
|
|
}
|
|
}
|