boxtec
/
yacy_search_server
mirror of https://github.com/yacy/yacy_search_server
4
1
Fork 0
Code Issues Projects Releases Wiki Activity
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.
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'd167b14ab6'
${ noResults }
yacy_search_server/source/net/yacy/document/TextParser.java

837 lines
41 KiB
Raw Blame History

/**
* TextParser.java
* Copyright 2009 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
* First released 09.07.2009 at http://yacy.net
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.document;
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.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.io.input.CloseShieldInputStream;
import net.yacy.cora.document.encoding.UTF8;
import net.yacy.cora.document.id.DigestURL;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.util.CommonPattern;
import net.yacy.cora.util.StrictLimitInputStream;
import net.yacy.document.parser.GenericXMLParser;
import net.yacy.document.parser.XZParser;
import net.yacy.document.parser.apkParser;
import net.yacy.document.parser.audioTagParser;
import net.yacy.document.parser.bzipParser;
import net.yacy.document.parser.csvParser;
import net.yacy.document.parser.docParser;
import net.yacy.document.parser.genericParser;
import net.yacy.document.parser.gzipParser;
import net.yacy.document.parser.gzipParser.GZIPOpeningStreamException;
import net.yacy.document.parser.htmlParser;
import net.yacy.document.parser.linkScraperParser;
import net.yacy.document.parser.mmParser;
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.sidAudioParser;
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.genericImageParser;
import net.yacy.document.parser.images.metadataImageParser;
import net.yacy.document.parser.images.svgParser;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.MemoryControl;
public final class TextParser {
private static final Object v = new Object();
private static final Parser genericIdiom = new genericParser();
/** A generic XML parser instance */
private static final Parser genericXMLIdiom = new GenericXMLParser();
//use LinkedHashSet for parser collection to use (init) order to prefered parser for same ext or mime
private static final Map<String, LinkedHashSet<Parser>> mime2parser = new ConcurrentHashMap<String, LinkedHashSet<Parser>>();
private static final ConcurrentHashMap<String, LinkedHashSet<Parser>> ext2parser = new ConcurrentHashMap<String, LinkedHashSet<Parser>>();
private static final Map<String, String> ext2mime = new ConcurrentHashMap<String, String>();
private static final Map<String, Object> denyMime = new ConcurrentHashMap<String, Object>();
private static final Map<String, Object> denyExtensionx = new ConcurrentHashMap<String, Object>();
static {
initParser(new apkParser());
initParser(new bzipParser());
initParser(new XZParser());
initParser(new csvParser());
initParser(new docParser());
initParser(new gzipParser());
// AugmentParser calls internally RDFaParser (therefore add before RDFa)
// if (Switchboard.getSwitchboard().getConfigBool("parserAugmentation", true)) initParser(new AugmentParser()); // experimental implementation, not working yet (2015-06-05)
// RDFaParser calls internally htmlParser (therefore add before html)
// if (Switchboard.getSwitchboard().getConfigBool("parserAugmentation.RDFa", true)) initParser(new RDFaParser()); // experimental implementation, not working yet (2015-06-04)
initParser(new htmlParser()); // called within rdfa parser
initParser(new genericImageParser());
initParser(new metadataImageParser());
initParser(new linkScraperParser());
initParser(new mmParser());
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 sidAudioParser());
initParser(new svgParser());
initParser(new tarParser());
initParser(new torrentParser());
initParser(new vcfParser());
initParser(new vsdParser());
initParser(new xlsParser());
initParser(new zipParser());
initParser(new audioTagParser());
/* Order is important : the generic XML parser must be initialized in last, so it will be effectively used only as a fallback one
* when a specialized parser exists for any XML based format (examples : rssParser or ooxmlParser must be tried first) */
initParser(genericXMLIdiom);
}
public static Set<Parser> parsers() {
final Set<Parser> c = new HashSet<Parser>();
for (Set<Parser> pl: ext2parser.values()) c.addAll(pl);
for (Set<Parser> pl: mime2parser.values()) c.addAll(pl);
return c;
}
/**
* @return the set of all supported mime types
*/
public static Set<String> supportedMimeTypes() {
final Set<String> mimeTypes = new HashSet<>();
mimeTypes.addAll(mime2parser.keySet());
return mimeTypes;
}
private static void initParser(final Parser parser) {
String prototypeMime = null;
for (final String mime: parser.supportedMimeTypes()) {
// process the mime types
final String mimeType = normalizeMimeType(mime);
if (prototypeMime == null) prototypeMime = mimeType;
LinkedHashSet<Parser> p0 = mime2parser.get(mimeType);
if (p0 == null) {
p0 = new LinkedHashSet<Parser>();
mime2parser.put(mimeType, p0);
}
p0.add(parser);
AbstractParser.log.info("Parser for mime type '" + mimeType + "': " + parser.getName());
}
if (prototypeMime != null) for (String ext: parser.supportedExtensions()) {
ext = ext.toLowerCase(Locale.ROOT);
final String s = ext2mime.get(ext);
if (s != null && !s.equals(prototypeMime)) AbstractParser.log.info("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
ext = ext.toLowerCase(Locale.ROOT);
LinkedHashSet<Parser> p0 = ext2parser.get(ext);
if (p0 == null) {
p0 = new LinkedHashSet<Parser>();
ext2parser.put(ext, p0);
}
p0.add(parser);
AbstractParser.log.info("Parser for extension '" + ext + "': " + parser.getName());
}
}
public static Document[] parseSource(
final DigestURL location,
final String mimeType,
final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper,
final int timezoneOffset,
final int depth,
final File sourceFile
) throws InterruptedException, Parser.Failure {
BufferedInputStream sourceStream = null;
Document[] docs = null;
try {
if (AbstractParser.log.isFine()) AbstractParser.log.fine("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).";
AbstractParser.log.info("Unable to parse '" + location + "'. " + errorMsg);
throw new Parser.Failure(errorMsg, location);
}
sourceStream = new BufferedInputStream(new FileInputStream(sourceFile));
docs = parseSource(location, mimeType, charset, ignore_class_name, scraper, timezoneOffset, depth, sourceFile.length(), sourceStream);
} catch (final Exception e) {
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof Parser.Failure) throw (Parser.Failure) e;
AbstractParser.log.severe("Unexpected exception in parseSource from File: " + e.getMessage(), e);
throw new Parser.Failure("Unexpected exception: " + e.getMessage(), location);
} finally {
if (sourceStream != null) try { sourceStream.close(); } catch (final Exception ex) {}
}
return docs;
}
public static Document[] parseSource(
final DigestURL location,
String mimeType,
final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper,
final int timezoneOffset,
final int depth,
final byte[] content
) throws Parser.Failure {
if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from byte-array");
mimeType = normalizeMimeType(mimeType);
Set<Parser> idioms = null;
try {
idioms = parsers(location, mimeType);
} catch (final Parser.Failure e) {
final String errorMsg = "Parser Failure for extension '" + MultiProtocolURL.getFileExtension(location.getFileName()) + "' or mimetype '" + mimeType + "': " + e.getMessage();
AbstractParser.log.warn(errorMsg);
throw new Parser.Failure(errorMsg, location);
}
assert !idioms.isEmpty() : "no parsers applied for url " + location.toNormalform(true);
Document[] docs = parseSource(location, mimeType, idioms, charset, ignore_class_name, scraper, timezoneOffset, depth, content, Integer.MAX_VALUE, Long.MAX_VALUE);
return docs;
}
/**
* Apply only the generic parser to the given content from location.
*/
public static Document[] genericParseSource(
final DigestURL location,
String mimeType,
final String charset,
final Set<String> ignoreClassNames,
final VocabularyScraper scraper,
final int timezoneOffset,
final int depth,
final byte[] content
) throws Parser.Failure {
if (AbstractParser.log.isFine()) {
AbstractParser.log.fine("Parsing '" + location + "' from byte-array, applying only the generic parser");
}
mimeType = normalizeMimeType(mimeType);
Set<Parser> idioms = new HashSet<>();
idioms.add(TextParser.genericIdiom);
return parseSource(location, mimeType, idioms, charset, ignoreClassNames, scraper, timezoneOffset, depth, content, Integer.MAX_VALUE, Long.MAX_VALUE);
}
private static Document[] parseSource(
final DigestURL location,
String mimeType,
final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper,
final int timezoneOffset,
final int depth,
final long contentLength,
final InputStream sourceStream,
final int maxLinks,
final long maxBytes
) throws Parser.Failure {
if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from stream");
mimeType = normalizeMimeType(mimeType);
Set<Parser> idioms = null;
try {
idioms = parsers(location, mimeType);
} catch (final Parser.Failure e) {
final String errorMsg = "Parser Failure for extension '" + MultiProtocolURL.getFileExtension(location.getFileName()) + "' or mimetype '" + mimeType + "': " + e.getMessage();
AbstractParser.log.warn(errorMsg);
throw new Parser.Failure(errorMsg, location);
}
assert !idioms.isEmpty() : "no parsers applied for url " + location.toNormalform(true);
boolean canStream = false;
if(idioms.size() == 1) {
canStream = true;
} else if(idioms.size() == 2) {
/* When there are only 2 available parsers, stream oriented parsing can still be applied when one of the 2 parsers is the generic one */
for(Parser idiom : idioms) {
if(idiom instanceof genericParser) {
canStream = true;
}
}
} else if(sourceStream instanceof ByteArrayInputStream) {
/* Also check if we have a ByteArrayInputStream as source to prevent useless bytes duplication in a new byte array */
canStream = true;
}
// 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,
// or stream is already in memory as a ByteArrayInputStream
// then we use only stream-oriented parser.
if (canStream || contentLength > Integer.MAX_VALUE || contentLength > MemoryControl.available()) {
try {
/* The size of the buffer on the stream must be large enough to allow parser implementations to start parsing the resource
* and eventually fail, but must also be larger than eventual parsers internal buffers such as BufferedInputStream.DEFAULT_BUFFER_SIZE (8192 bytes) */
int rewindSize = 10 * 1024;
final InputStream markableStream;
if(sourceStream instanceof ByteArrayInputStream) {
/* No nead to use a wrapping buffered stream when the source is already entirely in memory.
* What's more, ByteArrayInputStream has no read limit when marking.*/
markableStream = sourceStream;
} else {
markableStream = new BufferedInputStream(sourceStream, rewindSize);
}
/* Mark now to allow resetting the buffered stream to the beginning of the stream */
markableStream.mark(rewindSize);
/* Loop on parser : they are supposed to be sorted in order to start with the most specific and end with the most generic */
for(Parser parser : idioms) {
/* Wrap in a CloseShieldInputStream to prevent SAX parsers closing the sourceStream
* and so let us eventually reuse the same opened stream with other parsers on parser failure */
CloseShieldInputStream nonCloseInputStream = new CloseShieldInputStream(markableStream);
try {
return parseSource(location, mimeType, parser, charset, ignore_class_name, scraper, timezoneOffset,
nonCloseInputStream, maxLinks, maxBytes);
} catch (Parser.Failure e) {
/* Try to reset the marked stream. If the failed parser has consumed too many bytes :
* too bad, the marks is invalid and process fails now with an IOException */
markableStream.reset();
if(parser instanceof gzipParser && e.getCause() instanceof GZIPOpeningStreamException
&& (idioms.size() == 1 || (idioms.size() == 2 && idioms.contains(genericIdiom)))) {
/* The gzip parser failed directly when opening the content stream : before falling back to the generic parser,
* let's have a chance to parse the stream as uncompressed. */
/* Indeed, this can be a case of misconfigured web server, providing both headers "Content-Encoding" with value "gzip",
* and "Content-type" with value such as "application/gzip".
* In that case our HTTP client (see GzipResponseInterceptor) is already uncompressing the stream on the fly,
* that's why the gzipparser fails opening the stream.
* (see RFC 7231 section 3.1.2.2 for "Content-Encoding" header specification https://tools.ietf.org/html/rfc7231#section-3.1.2.2)*/
gzipParser gzParser = (gzipParser)parser;
nonCloseInputStream = new CloseShieldInputStream(markableStream);
Document maindoc = gzipParser.createMainDocument(location, mimeType, charset, gzParser);
try {
Document[] docs = gzParser.parseCompressedInputStream(location,
charset, timezoneOffset, depth,
nonCloseInputStream, maxLinks, maxBytes);
if (docs != null) {
maindoc.addSubDocuments(docs);
}
return new Document[] { maindoc };
} catch(Exception e1) {
/* Try again to reset the marked stream if the failed parser has not consumed too many bytes */
markableStream.reset();
}
}
}
}
} catch (IOException e) {
throw new Parser.Failure("Error reading source", location);
}
}
// in case that we know more parsers we first transform the content into a byte[] and use that as base
// for a number of different parse attempts.
int maxBytesToRead = -1;
if(maxBytes < Integer.MAX_VALUE) {
/* Load at most maxBytes + 1 :
- to let parsers not supporting Parser.parseWithLimits detect the maxBytes size is exceeded and end with a Parser.Failure
- but let parsers supporting Parser.parseWithLimits perform partial parsing of maxBytes content */
maxBytesToRead = (int)maxBytes + 1;
}
if(contentLength >= 0 && contentLength < maxBytesToRead) {
maxBytesToRead = (int)contentLength;
}
byte[] b = null;
try {
b = FileUtils.read(sourceStream, maxBytesToRead);
} catch (final IOException e) {
throw new Parser.Failure(e.getMessage(), location);
}
Document[] docs = parseSource(location, mimeType, idioms, charset, ignore_class_name, scraper, timezoneOffset, depth, b, maxLinks, maxBytes);
return docs;
}
public static Document[] parseSource(final DigestURL location, String mimeType, final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper, final int timezoneOffset, final int depth, final long contentLength,
final InputStream sourceStream) throws Parser.Failure {
return parseSource(location, mimeType, charset, ignore_class_name, scraper, timezoneOffset, depth, contentLength, sourceStream,
Integer.MAX_VALUE, Long.MAX_VALUE);
}
/**
* Try to limit the parser processing with a maximum total number of links detection (anchors, images links, media links...)
* or a maximum amount of content bytes to parse. Limits apply only when the available parsers for the resource media type support parsing within limits
* (see {@link Parser#isParseWithLimitsSupported()}. When available parsers do
* not support parsing within limits, an exception is thrown when
* content size is beyond maxBytes.
* @param location the URL of the source
* @param mimeType the mime type of the source, if known
* @param charset the charset name of the source, if known
* @param ignoreClassNames an eventual set of CSS class names whose matching html elements content should be ignored
* @param timezoneOffset the local time zone offset
* @param depth the current depth of the crawl
* @param contentLength the length of the source, if known (else -1 should be used)
* @param source a input stream
* @param maxLinks the maximum total number of links to parse and add to the result documents
* @param maxBytes the maximum number of content bytes to process
* @return a list of documents that result from parsing the source, with empty or null text.
* @throws Parser.Failure when the parser processing failed
*/
public static Document[] parseWithLimits(final DigestURL location, String mimeType, final String charset, final Set<String> ignoreClassNames,
final int timezoneOffset, final int depth, final long contentLength, final InputStream sourceStream, int maxLinks,
long maxBytes) throws Parser.Failure{
return parseSource(location, mimeType, charset, ignoreClassNames, new VocabularyScraper(), timezoneOffset, depth, contentLength,
sourceStream, maxLinks, maxBytes);
}
/**
* Try to limit the parser processing with a maximum total number of links detection (anchors, images links, media links...)
* or a maximum amount of content bytes to parse. Limits apply only when the available parsers for the resource media type support parsing within limits
* (see {@link Parser#isParseWithLimitsSupported()}. When available parsers do
* not support parsing within limits, an exception is thrown when
* content size is beyond maxBytes.
* @param location the URL of the source
* @param mimeType the mime type of the source, if known
* @param charset the charset name of the source, if known
* @param timezoneOffset the local time zone offset
* @param depth the current depth of the crawl
* @param contentLength the length of the source, if known (else -1 should be used)
* @param source a input stream
* @param maxLinks the maximum total number of links to parse and add to the result documents
* @param maxBytes the maximum number of content bytes to process
* @return a list of documents that result from parsing the source, with empty or null text.
* @throws Parser.Failure when the parser processing failed
*/
public static Document[] parseWithLimits(final DigestURL location, String mimeType, final String charset,
final int timezoneOffset, final int depth, final long contentLength, final InputStream sourceStream, int maxLinks,
long maxBytes) throws Parser.Failure{
return parseSource(location, mimeType, charset, new HashSet<String>(), new VocabularyScraper(), timezoneOffset, depth, contentLength,
sourceStream, maxLinks, maxBytes);
}
/**
*
* @param location the URL of the source
* @param mimeType the mime type of the source, if known
* @param parser a parser supporting the resource at location
* @param charset the charset name of the source, if known
* @param scraper a vocabulary scraper
* @param timezoneOffset the local time zone offset
* @param sourceStream an open input stream on the source
* @param maxLinks the maximum total number of links to parse and add to the result documents
* @param maxBytes the maximum number of content bytes to process
* @return a list of documents that result from parsing the source
* @throws Parser.Failure when the source could not be parsed
*/
private static Document[] parseSource(
final DigestURL location,
final String mimeType,
final Parser parser,
final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper,
final int timezoneOffset,
final InputStream sourceStream,
final int maxLinks,
final long maxBytes
) throws Parser.Failure {
if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing '" + location + "' from stream");
final String fileExt = MultiProtocolURL.getFileExtension(location.getFileName());
final String documentCharset = htmlParser.patchCharsetEncoding(charset);
assert parser != null;
if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing " + location + " with mimeType '" + mimeType + "' and file extension '" + fileExt + "'.");
try {
final Document[] docs;
if(parser.isParseWithLimitsSupported()) {
docs = parser.parseWithLimits(location, mimeType, documentCharset, ignore_class_name, scraper, timezoneOffset, sourceStream, maxLinks, maxBytes);
} else {
/* Parser do not support partial parsing within limits : let's control it here*/
InputStream limitedSource = new StrictLimitInputStream(sourceStream, maxBytes);
docs = parser.parse(location, mimeType, documentCharset, ignore_class_name, scraper, timezoneOffset, limitedSource);
}
return docs;
} catch(Parser.Failure e) {
throw e;
} catch (final Exception e) {
throw new Parser.Failure("parser failed: " + parser.getName(), location);
}
}
/**
* @param location the URL of the source
* @param mimeType the mime type of the source, if known
* @param parsers a set of parsers supporting the resource at location
* @param charset the charset name of the source, if known
* @param scraper a vocabulary scraper
* @param timezoneOffset the local time zone offset
* @param depth the current crawling depth
* @param sourceArray the resource content bytes
* @param maxLinks the maximum total number of links to parse and add to the result documents
* @param maxBytes the maximum number of content bytes to process
* @return a list of documents that result from parsing the source
* @throws Parser.Failure when the source could not be parsed
*/
private static Document[] parseSource(
final DigestURL location,
final String mimeType,
final Set<Parser> parsers,
final String charset,
final Set<String> ignore_class_name,
final VocabularyScraper scraper,
final int timezoneOffset,
final int depth,
final byte[] sourceArray,
final int maxLinks,
final long maxBytes
) throws Parser.Failure {
final String fileExt = MultiProtocolURL.getFileExtension(location.getFileName());
if (AbstractParser.log.isFine()) AbstractParser.log.fine("Parsing " + location + " with mimeType '" + mimeType + "' and file extension '" + fileExt + "' from byte[]");
final String documentCharset = htmlParser.patchCharsetEncoding(charset);
assert !parsers.isEmpty();
Document[] docs = null;
final Map<Parser, Parser.Failure> failedParser = new HashMap<Parser, Parser.Failure>();
String origName = Thread.currentThread().getName();
Thread.currentThread().setName("parsing + " + location.toString()); // set a name to get the address in Thread Dump
for (final Parser parser: parsers) {
if (MemoryControl.request(sourceArray.length * 6, false)) {
ByteArrayInputStream bis;
if (mimeType.equals("text/plain") && parser.getName().equals("HTML Parser")) {
// a hack to simulate html files .. is needed for NOLOAD queues. This throws their data into virtual text/plain messages.
bis = new ByteArrayInputStream(UTF8.getBytes("<html><head></head><body><h1>" + UTF8.String(sourceArray) + "</h1></body><html>"));
} else {
bis = new ByteArrayInputStream(sourceArray);
}
try {
if(parser.isParseWithLimitsSupported()) {
docs = parser.parseWithLimits(location, mimeType, documentCharset, ignore_class_name, scraper, timezoneOffset, bis, maxLinks, maxBytes);
} else {
/* Partial parsing is not supported by this parser : check content length now */
if(sourceArray.length > maxBytes) {
throw new Parser.Failure("Content size is over maximum size of " + maxBytes + "", location);
}
docs = parser.parse(location, mimeType, documentCharset, ignore_class_name, scraper, timezoneOffset, bis);
}
} catch (final Parser.Failure e) {
if(parser instanceof gzipParser && e.getCause() instanceof GZIPOpeningStreamException &&
(parsers.size() == 1 || (parsers.size() == 2 && parsers.contains(genericIdiom)))) {
/* The gzip parser failed directly when opening the content stream : before falling back to the generic parser,
* let's have a chance to parse the stream as uncompressed. */
/* Indeed, this can be a case of misconfigured web server, providing both headers "Content-Encoding" with value "gzip",
* and "Content-type" with value such as "application/gzip".
* In that case our HTTP client (see GzipResponseInterceptor) is already uncompressing the stream on the fly,
* that's why the gzipparser fails opening the stream.
* (see RFC 7231 section 3.1.2.2 for "Content-Encoding" header specification https://tools.ietf.org/html/rfc7231#section-3.1.2.2)*/
gzipParser gzParser = (gzipParser)parser;
bis = new ByteArrayInputStream(sourceArray);
Document maindoc = gzipParser.createMainDocument(location, mimeType, charset, gzParser);
try {
docs = gzParser.parseCompressedInputStream(location,
charset, timezoneOffset, depth,
bis, maxLinks, maxBytes);
if (docs != null) {
maindoc.addSubDocuments(docs);
}
docs = new Document[] { maindoc };
break;
} catch(Parser.Failure e1) {
failedParser.put(parser, e1);
} catch(Exception e2) {
failedParser.put(parser, new Parser.Failure(e2.getMessage(), location));
}
} else {
failedParser.put(parser, e);
}
} catch (final Exception e) {
failedParser.put(parser, new Parser.Failure(e.getMessage(), location));
//log.logWarning("tried parser '" + parser.getName() + "' to parse " + location.toNormalform(true, false) + " but failed: " + e.getMessage(), e);
} finally {
try {
bis.close();
} catch(IOException ioe) {
// Ignore.
}
}
if (docs != null) break;
}
}
Thread.currentThread().setName(origName);
if (docs == null) {
if (failedParser.isEmpty()) {
final String errorMsg = "Parsing content with file extension '" + fileExt + "' and mimetype '" + mimeType + "' failed.";
//log.logWarning("Unable to parse '" + location + "'. " + errorMsg);
throw new Parser.Failure(errorMsg, location);
}
String failedParsers = "";
for (final Map.Entry<Parser, Parser.Failure> error: failedParser.entrySet()) {
AbstractParser.log.warn("tried parser '" + error.getKey().getName() + "' to parse " + location.toNormalform(true) + " but failed: " + error.getValue().getMessage(), error.getValue());
failedParsers += error.getKey().getName() + " ";
}
throw new Parser.Failure("All parser failed: " + failedParsers, location);
}
for (final Document d: docs) {
InputStream textStream = d.getTextStream();
assert textStream != null : "mimeType = " + mimeType;
try {
if(textStream != null) {
/* textStream can be a FileInputStream : we must close it to ensure releasing system resource */
textStream.close();
}
} catch (IOException e) {
AbstractParser.log.warn("Could not close text input stream");
}
d.setDepth(depth);
} // verify docs
return docs;
}
/**
* 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 MultiProtocolURL url, final 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.
final Set<Parser> idioms = parsers(url, mimeType);
return (idioms == null || idioms.isEmpty() || (idioms.size() == 1 && idioms.iterator().next().getName().equals(genericIdiom.getName()))) ? "no parser found" : null;
} catch (final Parser.Failure 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 mime type (1.)
* - the extension of url (2.)
* - the mime type computed from the extension (3.)
* finally the generic parser is added as backup if all above fail
* @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 Parser.Failure when the file extension or the MIME type is denied
*/
private static Set<Parser> parsers(final MultiProtocolURL url, String mimeType1) throws Parser.Failure {
final Set<Parser> idioms = new LinkedHashSet<Parser>(2); // LinkedSet to maintain order (genericParser should be last)
// check given mime type, place this first because this is the most likely to work and the best fit to the supplied mime
Set<Parser> idiom;
if (mimeType1 != null) {
mimeType1 = normalizeMimeType(mimeType1);
if (denyMime.containsKey(mimeType1)) throw new Parser.Failure("mime type '" + mimeType1 + "' is denied (1)", url);
idiom = mime2parser.get(mimeType1);
if (idiom != null) idioms.addAll(idiom);
}
// check extension and add as backup (in case no, wrong or unknown/unsupported mime was supplied)
String ext = MultiProtocolURL.getFileExtension(url.getFileName());
if (ext != null && ext.length() > 0) {
/* We do not throw here an exception when the media type is provided and inconsistent with the extension (if it is not supported an exception has already beeen thrown).
* Otherwise we would reject URLs with an apparently unsupported extension but whose actual Media Type is supported (for example text/html).
* Notable example : wikimedia commons pages, such as https://commons.wikimedia.org/wiki/File:YaCy_logo.png */
if (denyExtensionx.containsKey(ext) && (mimeType1 == null || mimeType1.equals(mimeOf(ext)))) {
throw new Parser.Failure("file extension '" + ext + "' is denied (1)", url);
}
idiom = ext2parser.get(ext);
if (idiom != null && !idioms.containsAll(idiom)) { // use containsAll -> idiom is a Set of parser
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);
}
/* No matching idiom has been found : let's check if the media type ends with the "+xml" suffix so we can handle it with a generic XML parser
* (see RFC 7303 - Using '+xml' when Registering XML-Based Media Types : https://tools.ietf.org/html/rfc7303#section-4.2) */
if(idioms.isEmpty() && mimeType1 != null && mimeType1.endsWith("+xml")) {
idioms.add(genericXMLIdiom);
}
// 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) {
/* No matching idiom has been found : let's check if the media type ends with the "+xml" suffix as can handle it with a generic XML parser
* (see RFC 7303 - Using '+xml' when Registering XML-Based Media Types : https://tools.ietf.org/html/rfc7303#section-4.2) */
if(!mimeType.endsWith("+xml")) {
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(Locale.ROOT));
}
/**
* Normalize a media type information string (can be a HTTP "Content-Type"
* response header) : convert to lower case, remove any supplementary
* parameters such as the encoding (charset name), and provide a default
* value when null.
*
* @param mimeType
* raw information about media type, eventually provided by a
* HTTP "Content-Type" response header
* @return a non null media type in lower case
*/
public static String normalizeMimeType(String mimeType) {
if (mimeType == null) {
return "application/octet-stream";
}
mimeType = mimeType.toLowerCase(Locale.ROOT);
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);
}
}
Reference in new issue View Git Blame Copy Permalink