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548 lines
25 KiB
548 lines
25 KiB
/**
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* TextParser.java
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* Copyright 2009 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 09.07.2009 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.cora.util.CommonPattern;
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import net.yacy.document.parser.apkParser;
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import net.yacy.document.parser.audioTagParser;
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import net.yacy.document.parser.bzipParser;
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import net.yacy.document.parser.csvParser;
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import net.yacy.document.parser.docParser;
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import net.yacy.document.parser.genericParser;
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import net.yacy.document.parser.gzipParser;
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import net.yacy.document.parser.htmlParser;
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import net.yacy.document.parser.linkScraperParser;
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import net.yacy.document.parser.mmParser;
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import net.yacy.document.parser.odtParser;
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import net.yacy.document.parser.ooxmlParser;
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import net.yacy.document.parser.pdfParser;
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import net.yacy.document.parser.pptParser;
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import net.yacy.document.parser.psParser;
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import net.yacy.document.parser.rssParser;
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import net.yacy.document.parser.rtfParser;
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import net.yacy.document.parser.sevenzipParser;
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import net.yacy.document.parser.sidAudioParser;
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import net.yacy.document.parser.tarParser;
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import net.yacy.document.parser.torrentParser;
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import net.yacy.document.parser.vcfParser;
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import net.yacy.document.parser.vsdParser;
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import net.yacy.document.parser.xlsParser;
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import net.yacy.document.parser.zipParser;
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import net.yacy.document.parser.images.genericImageParser;
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import net.yacy.document.parser.images.metadataImageParser;
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import net.yacy.document.parser.images.svgParser;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.kelondro.util.MemoryControl;
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public final class TextParser {
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private static final Object v = new Object();
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private static final Parser genericIdiom = new genericParser();
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//use LinkedHashSet for parser collection to use (init) order to prefered parser for same ext or mime
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private static final Map<String, LinkedHashSet<Parser>> mime2parser = new ConcurrentHashMap<String, LinkedHashSet<Parser>>();
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private static final ConcurrentHashMap<String, LinkedHashSet<Parser>> ext2parser = new ConcurrentHashMap<String, LinkedHashSet<Parser>>();
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private static final Map<String, String> ext2mime = new ConcurrentHashMap<String, String>();
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private static final Map<String, Object> denyMime = new ConcurrentHashMap<String, Object>();
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private static final Map<String, Object> denyExtensionx = new ConcurrentHashMap<String, Object>();
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static {
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initParser(new apkParser());
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initParser(new bzipParser());
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initParser(new csvParser());
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initParser(new docParser());
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initParser(new gzipParser());
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// AugmentParser calls internally RDFaParser (therefore add before RDFa)
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// if (Switchboard.getSwitchboard().getConfigBool("parserAugmentation", true)) initParser(new AugmentParser()); // experimental implementation, not working yet (2015-06-05)
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// RDFaParser calls internally htmlParser (therefore add before html)
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// if (Switchboard.getSwitchboard().getConfigBool("parserAugmentation.RDFa", true)) initParser(new RDFaParser()); // experimental implementation, not working yet (2015-06-04)
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initParser(new htmlParser()); // called within rdfa parser
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initParser(new genericImageParser());
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initParser(new metadataImageParser());
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initParser(new linkScraperParser());
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initParser(new mmParser());
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initParser(new odtParser());
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initParser(new ooxmlParser());
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initParser(new pdfParser());
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initParser(new pptParser());
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initParser(new psParser());
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initParser(new rssParser());
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initParser(new rtfParser());
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initParser(new sevenzipParser());
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initParser(new sidAudioParser());
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initParser(new svgParser());
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initParser(new tarParser());
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initParser(new torrentParser());
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initParser(new vcfParser());
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initParser(new vsdParser());
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initParser(new xlsParser());
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initParser(new zipParser());
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initParser(new audioTagParser());
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}
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public static Set<Parser> parsers() {
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final Set<Parser> c = new HashSet<Parser>();
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for (Set<Parser> pl: ext2parser.values()) c.addAll(pl);
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for (Set<Parser> pl: mime2parser.values()) c.addAll(pl);
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return c;
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}
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private static void initParser(final Parser parser) {
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String prototypeMime = null;
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for (final String mime: parser.supportedMimeTypes()) {
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// process the mime types
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final String mimeType = normalizeMimeType(mime);
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if (prototypeMime == null) prototypeMime = mimeType;
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LinkedHashSet<Parser> p0 = mime2parser.get(mimeType);
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if (p0 == null) {
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p0 = new LinkedHashSet<Parser>();
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mime2parser.put(mimeType, p0);
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}
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p0.add(parser);
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AbstractParser.log.info("Parser for mime type '" + mimeType + "': " + parser.getName());
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}
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if (prototypeMime != null) for (String ext: parser.supportedExtensions()) {
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ext = ext.toLowerCase();
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final String s = ext2mime.get(ext);
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if (s != null && !s.equals(prototypeMime)) AbstractParser.log.info("Parser for extension '" + ext + "' was set to mime '" + s + "', overwriting with new mime '" + prototypeMime + "'.");
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ext2mime.put(ext, prototypeMime);
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}
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for (String ext: parser.supportedExtensions()) {
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// process the extensions
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ext = ext.toLowerCase();
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LinkedHashSet<Parser> p0 = ext2parser.get(ext);
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if (p0 == null) {
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p0 = new LinkedHashSet<Parser>();
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ext2parser.put(ext, p0);
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}
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p0.add(parser);
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AbstractParser.log.info("Parser for extension '" + ext + "': " + parser.getName());
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}
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}
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public static Document[] parseSource(
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final DigestURL location,
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final String mimeType,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final int depth,
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final File sourceFile
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) throws InterruptedException, Parser.Failure {
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BufferedInputStream sourceStream = null;
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Document[] docs = null;
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try {
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from file");
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if (!sourceFile.exists() || !sourceFile.canRead() || sourceFile.length() == 0) {
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final String errorMsg = sourceFile.exists() ? "Empty resource file." : "No resource content available (2).";
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AbstractParser.log.info("Unable to parse '" + location + "'. " + errorMsg);
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throw new Parser.Failure(errorMsg, location);
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}
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sourceStream = new BufferedInputStream(new FileInputStream(sourceFile));
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docs = parseSource(location, mimeType, charset, scraper, timezoneOffset, depth, sourceFile.length(), sourceStream);
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} catch (final Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof Parser.Failure) throw (Parser.Failure) e;
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AbstractParser.log.severe("Unexpected exception in parseSource from File: " + e.getMessage(), e);
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throw new Parser.Failure("Unexpected exception: " + e.getMessage(), location);
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} finally {
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if (sourceStream != null) try { sourceStream.close(); } catch (final Exception ex) {}
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}
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return docs;
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}
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public static Document[] parseSource(
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final DigestURL location,
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String mimeType,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final int depth,
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final byte[] content
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) throws Parser.Failure {
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from byte-array");
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mimeType = normalizeMimeType(mimeType);
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Set<Parser> idioms = null;
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try {
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idioms = parsers(location, mimeType);
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} catch (final Parser.Failure e) {
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final String errorMsg = "Parser Failure for extension '" + MultiProtocolURL.getFileExtension(location.getFileName()) + "' or mimetype '" + mimeType + "': " + e.getMessage();
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AbstractParser.log.warn(errorMsg);
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throw new Parser.Failure(errorMsg, location);
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}
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assert !idioms.isEmpty() : "no parsers applied for url " + location.toNormalform(true);
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Document[] docs = parseSource(location, mimeType, idioms, charset, scraper, timezoneOffset, depth, content);
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return docs;
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}
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public static Document[] parseSource(
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final DigestURL location,
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String mimeType,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final int depth,
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final long contentLength,
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final InputStream sourceStream
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) throws Parser.Failure {
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from stream");
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mimeType = normalizeMimeType(mimeType);
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Set<Parser> idioms = null;
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try {
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idioms = parsers(location, mimeType);
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} catch (final Parser.Failure e) {
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final String errorMsg = "Parser Failure for extension '" + MultiProtocolURL.getFileExtension(location.getFileName()) + "' or mimetype '" + mimeType + "': " + e.getMessage();
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AbstractParser.log.warn(errorMsg);
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throw new Parser.Failure(errorMsg, location);
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}
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assert !idioms.isEmpty() : "no parsers applied for url " + location.toNormalform(true);
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boolean canStream = false;
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Parser streamParser = idioms.iterator().next();
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if(idioms.size() == 1) {
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canStream = true;
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} else if(idioms.size() == 2) {
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/* When there are only 2 available parsers, stream oriented parsing can still be applied when one of the 2 parsers is the generic one*/
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for(Parser idiom : idioms) {
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if(idiom instanceof genericParser) {
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canStream = true;
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} else {
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/* stream oriented parsing will be performed by the non generic parser */
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streamParser = idiom;
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}
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}
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} else if(idioms.size() > 2) {
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/* Prefer the first available non generic parser */
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for(Parser idiom : idioms) {
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if(!(idiom instanceof genericParser)) {
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streamParser = idiom;
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break;
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}
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}
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}
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// if we do not have more than one non generic parser or the content size is over MaxInt (2GB) or is over the totally available memory
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// then we use only one stream-oriented parser.
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if (canStream || contentLength > Integer.MAX_VALUE || contentLength > MemoryControl.available()) {
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// use a specific stream-oriented parser
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return parseSource(location, mimeType, streamParser, charset, scraper, timezoneOffset, sourceStream);
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}
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// in case that we know more parsers we first transform the content into a byte[] and use that as base
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// for a number of different parse attempts.
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byte[] b = null;
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try {
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b = FileUtils.read(sourceStream, (int) contentLength);
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} catch (final IOException e) {
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throw new Parser.Failure(e.getMessage(), location);
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}
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Document[] docs = parseSource(location, mimeType, idioms, charset, scraper, timezoneOffset, depth, b);
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return docs;
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}
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private static Document[] parseSource(
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final DigestURL location,
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final String mimeType,
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final Parser parser,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final InputStream sourceStream
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) throws Parser.Failure {
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from stream");
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final String fileExt = MultiProtocolURL.getFileExtension(location.getFileName());
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final String documentCharset = htmlParser.patchCharsetEncoding(charset);
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assert parser != null;
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing " + location + " with mimeType '" + mimeType + "' and file extension '" + fileExt + "'.");
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try {
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final Document[] docs = parser.parse(location, mimeType, documentCharset, scraper, timezoneOffset, sourceStream);
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return docs;
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} catch (final Exception e) {
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throw new Parser.Failure("parser failed: " + parser.getName(), location);
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}
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}
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private static Document[] parseSource(
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final DigestURL location,
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final String mimeType,
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final Set<Parser> parsers,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final int depth,
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final byte[] sourceArray
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) throws Parser.Failure {
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final String fileExt = MultiProtocolURL.getFileExtension(location.getFileName());
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if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing " + location + " with mimeType '" + mimeType + "' and file extension '" + fileExt + "' from byte[]");
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final String documentCharset = htmlParser.patchCharsetEncoding(charset);
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assert !parsers.isEmpty();
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Document[] docs = null;
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final Map<Parser, Parser.Failure> failedParser = new HashMap<Parser, Parser.Failure>();
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String origName = Thread.currentThread().getName();
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Thread.currentThread().setName("parsing + " + location.toString()); // set a name to get the address in Thread Dump
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for (final Parser parser: parsers) {
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if (MemoryControl.request(sourceArray.length * 6, false)) {
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ByteArrayInputStream bis;
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if (mimeType.equals("text/plain") && parser.getName().equals("HTML Parser")) {
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// a hack to simulate html files .. is needed for NOLOAD queues. This throws their data into virtual text/plain messages.
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bis = new ByteArrayInputStream(UTF8.getBytes("<html><head></head><body><h1>" + UTF8.String(sourceArray) + "</h1></body><html>"));
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} else {
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bis = new ByteArrayInputStream(sourceArray);
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}
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try {
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docs = parser.parse(location, mimeType, documentCharset, scraper, timezoneOffset, bis);
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} catch (final Parser.Failure e) {
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failedParser.put(parser, e);
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//log.logWarning("tried parser '" + parser.getName() + "' to parse " + location.toNormalform(true, false) + " but failed: " + e.getMessage(), e);
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} catch (final Exception e) {
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failedParser.put(parser, new Parser.Failure(e.getMessage(), location));
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//log.logWarning("tried parser '" + parser.getName() + "' to parse " + location.toNormalform(true, false) + " but failed: " + e.getMessage(), e);
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} finally {
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try {
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bis.close();
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} catch(IOException ioe) {
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// Ignore.
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}
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}
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if (docs != null) break;
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}
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}
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Thread.currentThread().setName(origName);
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if (docs == null) {
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if (failedParser.isEmpty()) {
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final String errorMsg = "Parsing content with file extension '" + fileExt + "' and mimetype '" + mimeType + "' failed.";
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//log.logWarning("Unable to parse '" + location + "'. " + errorMsg);
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throw new Parser.Failure(errorMsg, location);
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}
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String failedParsers = "";
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for (final Map.Entry<Parser, Parser.Failure> error: failedParser.entrySet()) {
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AbstractParser.log.warn("tried parser '" + error.getKey().getName() + "' to parse " + location.toNormalform(true) + " but failed: " + error.getValue().getMessage(), error.getValue());
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failedParsers += error.getKey().getName() + " ";
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}
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throw new Parser.Failure("All parser failed: " + failedParsers, location);
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}
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for (final Document d: docs) {
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InputStream textStream = d.getTextStream();
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assert textStream != null : "mimeType = " + mimeType;
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try {
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if(textStream != null) {
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/* textStream can be a FileInputStream : we must close it to ensure releasing system resource */
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textStream.close();
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}
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} catch (IOException e) {
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AbstractParser.log.warn("Could not close text input stream");
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}
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d.setDepth(depth);
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} // verify docs
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return docs;
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}
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/**
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* check if the parser supports the given content.
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* @param url
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* @param mimeType
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* @return returns null if the content is supported. If the content is not supported, return a error string.
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*/
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public static String supports(final MultiProtocolURL url, final String mimeType) {
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try {
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// 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.
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final Set<Parser> idioms = parsers(url, mimeType);
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return (idioms == null || idioms.isEmpty() || (idioms.size() == 1 && idioms.iterator().next().getName().equals(genericIdiom.getName()))) ? "no parser found" : null;
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} catch (final Parser.Failure e) {
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// in case that a parser is not available, return a error string describing the problem.
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return e.getMessage();
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}
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}
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/**
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* find a parser for a given url and mime type
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* because mime types returned by web severs are sometimes wrong, we also compute the mime type again
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* from the extension that can be extracted from the url path. That means that there are 3 criteria
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* that can be used to select a parser:
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* - the given mime type (1.)
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* - the extension of url (2.)
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* - the mime type computed from the extension (3.)
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* finally the generic parser is added as backup if all above fail
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* @param url the given url
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* @param mimeType the given mime type
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* @return a list of Idiom parsers that may be appropriate for the given criteria
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* @throws Parser.Failure
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*/
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private static Set<Parser> parsers(final MultiProtocolURL url, String mimeType1) throws Parser.Failure {
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final Set<Parser> idioms = new LinkedHashSet<Parser>(2); // LinkedSet to maintain order (genericParser should be last)
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// check given mime type, place this first because this is the most likely to work and the best fit to the supplied mime
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Set<Parser> idiom;
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if (mimeType1 != null) {
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mimeType1 = normalizeMimeType(mimeType1);
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if (denyMime.containsKey(mimeType1)) throw new Parser.Failure("mime type '" + mimeType1 + "' is denied (1)", url);
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idiom = mime2parser.get(mimeType1);
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if (idiom != null) idioms.addAll(idiom);
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}
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// check extension and add as backup (in case no, wrong or unknown/unsupported mime was suppied)
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String ext = MultiProtocolURL.getFileExtension(url.getFileName());
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if (ext != null && ext.length() > 0) {
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if (denyExtensionx.containsKey(ext)) throw new Parser.Failure("file extension '" + ext + "' is denied (1)", url);
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idiom = ext2parser.get(ext);
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if (idiom != null && !idioms.containsAll(idiom)) { // use containsAll -> idiom is a Set of parser
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idioms.addAll(idiom);
|
|
}
|
|
}
|
|
|
|
// check mime type computed from extension
|
|
final String mimeType2 = ext2mime.get(ext);
|
|
if (mimeType2 != null && (idiom = mime2parser.get(mimeType2)) != null && !idioms.containsAll(idiom)) { // use containsAll -> idiom is a Set of parser
|
|
idioms.addAll(idiom);
|
|
}
|
|
|
|
// always add the generic parser (make sure it is the last in access order)
|
|
idioms.add(genericIdiom);
|
|
//if (idioms.isEmpty()) throw new Parser.Failure("no parser found for extension '" + ext + "' and mime type '" + mimeType1 + "'", url);
|
|
|
|
return idioms;
|
|
}
|
|
|
|
/**
|
|
* checks if the parser supports the given mime type. It is not only checked if the parser can parse such types,
|
|
* it is also checked if the mime type is not included in the mimetype-deny list.
|
|
* @param mimeType
|
|
* @return an error if the mime type is not supported, null otherwise
|
|
*/
|
|
public static String supportsMime(String mimeType) {
|
|
if (mimeType == null) return null;
|
|
mimeType = normalizeMimeType(mimeType);
|
|
if (denyMime.containsKey(mimeType)) return "mime type '" + mimeType + "' is denied (2)";
|
|
if (mime2parser.get(mimeType) == null) return "no parser for mime '" + mimeType + "' available";
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* checks if the parser supports the given extension. It is not only checked if the parser can parse such files,
|
|
* it is also checked if the extension is not included in the extension-deny list.
|
|
* @param ext extension name
|
|
* @return an error if the extension is not supported, null otherwise
|
|
*/
|
|
public static String supportsExtension(final String ext) {
|
|
if (ext == null || ext.isEmpty()) return null;
|
|
if (denyExtensionx.containsKey(ext)) return "file extension '" + ext + "' is denied (2)";
|
|
final String mimeType = ext2mime.get(ext);
|
|
if (mimeType == null) return "no parser available";
|
|
final Set<Parser> idiom = mime2parser.get(mimeType);
|
|
assert idiom != null;
|
|
if (idiom == null || idiom.isEmpty()) return "no parser available (internal error!)";
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* checks if the parser supports the given extension or the file at the specified url. It is not only checked if the parser can parse such files,
|
|
* it is also checked if the extension is not included in the extension-deny list.
|
|
* @param url url to check
|
|
* @return an error if the extension is not supported, null otherwise
|
|
*/
|
|
public static String supportsExtension(final MultiProtocolURL url) {
|
|
return supportsExtension(MultiProtocolURL.getFileExtension(url.getFileName()));
|
|
}
|
|
|
|
public static String mimeOf(final MultiProtocolURL url) {
|
|
return mimeOf(MultiProtocolURL.getFileExtension(url.getFileName()));
|
|
}
|
|
|
|
public static String mimeOf(final String ext) {
|
|
return ext2mime.get(ext.toLowerCase());
|
|
}
|
|
|
|
private static String normalizeMimeType(String mimeType) {
|
|
if (mimeType == null) return "application/octet-stream";
|
|
mimeType = mimeType.toLowerCase();
|
|
final int pos = mimeType.indexOf(';');
|
|
return ((pos < 0) ? mimeType.trim() : mimeType.substring(0, pos).trim());
|
|
}
|
|
|
|
public static void setDenyMime(final String denyList) {
|
|
denyMime.clear();
|
|
String n;
|
|
for (final String s: CommonPattern.COMMA.split(denyList)) {
|
|
n = normalizeMimeType(s);
|
|
if (n != null && n.length() > 0) denyMime.put(n, v);
|
|
}
|
|
}
|
|
|
|
public static String getDenyMime() {
|
|
String s = "";
|
|
for (final String d: denyMime.keySet()) s += d + ",";
|
|
if (!s.isEmpty()) s = s.substring(0, s.length() - 1);
|
|
return s;
|
|
}
|
|
|
|
public static void grantMime(final String mime, final boolean grant) {
|
|
final String n = normalizeMimeType(mime);
|
|
if (n == null || n.isEmpty()) return;
|
|
if (grant) denyMime.remove(n); else denyMime.put(n, v);
|
|
}
|
|
|
|
public static void setDenyExtension(final String denyList) {
|
|
denyExtensionx.clear();
|
|
for (final String s: CommonPattern.COMMA.split(denyList)) denyExtensionx.put(s, v);
|
|
}
|
|
|
|
public static String getDenyExtension() {
|
|
String s = "";
|
|
for (final String d: denyExtensionx.keySet()) s += d + ",";
|
|
if (!s.isEmpty()) s = s.substring(0, s.length() - 1);
|
|
return s;
|
|
}
|
|
|
|
public static void grantExtension(final String ext, final boolean grant) {
|
|
if (ext == null || ext.isEmpty()) return;
|
|
if (grant) denyExtensionx.remove(ext); else denyExtensionx.put(ext, v);
|
|
}
|
|
|
|
}
|