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424 lines
19 KiB
424 lines
19 KiB
/**
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* htmlParser.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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* $LastChangedDate$
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* $LastChangedRevision$
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* $LastChangedBy$
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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.parser;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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import java.net.MalformedURLException;
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import java.nio.charset.Charset;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.StandardCharsets;
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import java.nio.charset.UnsupportedCharsetException;
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import java.util.LinkedHashMap;
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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.protocol.ClientIdentification;
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import net.yacy.cora.util.CommonPattern;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.VocabularyScraper;
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import net.yacy.document.parser.html.ContentScraper;
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import net.yacy.document.parser.html.ImageEntry;
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import net.yacy.document.parser.html.ScraperInputStream;
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import net.yacy.document.parser.html.TransformerWriter;
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import net.yacy.kelondro.util.FileUtils;
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import com.ibm.icu.text.CharsetDetector;
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public class htmlParser extends AbstractParser implements Parser {
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private static final int maxLinks = 10000;
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public htmlParser() {
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super("Streaming HTML Parser");
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this.SUPPORTED_EXTENSIONS.add("htm");
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this.SUPPORTED_EXTENSIONS.add("html");
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this.SUPPORTED_EXTENSIONS.add("shtml");
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this.SUPPORTED_EXTENSIONS.add("shtm");
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this.SUPPORTED_EXTENSIONS.add("stm");
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this.SUPPORTED_EXTENSIONS.add("xhtml");
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this.SUPPORTED_EXTENSIONS.add("phtml");
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this.SUPPORTED_EXTENSIONS.add("phtm");
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this.SUPPORTED_EXTENSIONS.add("tpl");
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this.SUPPORTED_EXTENSIONS.add("php");
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this.SUPPORTED_EXTENSIONS.add("php2");
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this.SUPPORTED_EXTENSIONS.add("php3");
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this.SUPPORTED_EXTENSIONS.add("php4");
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this.SUPPORTED_EXTENSIONS.add("php5");
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this.SUPPORTED_EXTENSIONS.add("cfm");
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this.SUPPORTED_EXTENSIONS.add("asp");
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this.SUPPORTED_EXTENSIONS.add("aspx");
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this.SUPPORTED_EXTENSIONS.add("tex");
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this.SUPPORTED_EXTENSIONS.add("txt");
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this.SUPPORTED_EXTENSIONS.add("msg");
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this.SUPPORTED_MIME_TYPES.add("text/html");
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this.SUPPORTED_MIME_TYPES.add("text/xhtml+xml");
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this.SUPPORTED_MIME_TYPES.add("application/xhtml+xml");
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this.SUPPORTED_MIME_TYPES.add("application/x-httpd-php");
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this.SUPPORTED_MIME_TYPES.add("application/x-tex");
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this.SUPPORTED_MIME_TYPES.add("application/vnd.ms-outlook");
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this.SUPPORTED_MIME_TYPES.add("text/plain");
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this.SUPPORTED_MIME_TYPES.add("text/csv");
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}
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@Override
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public Document[] parse(
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final DigestURL location,
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final String mimeType,
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final String documentCharset,
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final VocabularyScraper vocscraper,
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final int timezoneOffset,
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final InputStream sourceStream) throws Parser.Failure, InterruptedException {
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try {
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// first get a document from the parsed html
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Charset[] detectedcharsetcontainer = new Charset[]{null};
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ContentScraper scraper = parseToScraper(location, documentCharset, vocscraper, detectedcharsetcontainer, timezoneOffset, sourceStream, maxLinks);
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// parseToScraper also detects/corrects/sets charset from html content tag
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final Document document = transformScraper(location, mimeType, detectedcharsetcontainer[0].name(), scraper);
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Document documentSnapshot = null;
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try {
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// check for ajax crawling scheme (https://developers.google.com/webmasters/ajax-crawling/docs/specification)
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// and create a sub-document for snapshot page (which will be merged by loader)
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// TODO: as a crawl request removes anchor part from original url getRef() is never successful - considere other handling as removeRef() in crawler
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if (location.getRef() != null && location.getRef().startsWith("!")) {
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documentSnapshot = parseAlternativeSnapshot(location, mimeType, documentCharset, vocscraper, timezoneOffset);
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} else { // head tag fragment only allowed on url without anchor hashfragment, but there are discussions that existence of hashfragment anchor takes preference (means allow both)
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if (scraper.getMetas().containsKey("fragment") && scraper.getMetas().get("fragment").equals("!")) {
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documentSnapshot = parseAlternativeSnapshot(location, mimeType, documentCharset, vocscraper, timezoneOffset);
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}
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}
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} catch (Exception ex1) { // ignore any exception for any issue with snapshot
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documentSnapshot = null;
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}
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return documentSnapshot == null ? new Document[]{document} : new Document[]{document, documentSnapshot};
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} catch (final IOException e) {
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throw new Parser.Failure("IOException in htmlParser: " + e.getMessage(), location);
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}
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}
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/**
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* the transformScraper method transforms a scraper object into a document object
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* @param location
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* @param mimeType
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* @param charSet
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* @param scraper
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* @return a Document instance
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*/
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private Document transformScraper(final DigestURL location, final String mimeType, final String charSet, final ContentScraper scraper) {
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final String[] sections = new String[
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scraper.getHeadlines(1).length +
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scraper.getHeadlines(2).length +
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scraper.getHeadlines(3).length +
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scraper.getHeadlines(4).length +
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scraper.getHeadlines(5).length +
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scraper.getHeadlines(6).length];
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int p = 0;
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for (int i = 1; i <= 6; i++) {
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for (final String headline : scraper.getHeadlines(i)) {
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sections[p++] = headline;
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}
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}
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LinkedHashMap<DigestURL, ImageEntry> noDoubleImages = new LinkedHashMap<>();
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for (ImageEntry ie: scraper.getImages()) noDoubleImages.put(ie.url(), ie);
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final Document ppd = new Document(
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location,
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mimeType,
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charSet,
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this,
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scraper.getContentLanguages(),
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scraper.getKeywords(),
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scraper.getTitles(),
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scraper.getAuthor(),
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scraper.getPublisher(),
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sections,
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scraper.getDescriptions(),
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scraper.getLon(), scraper.getLat(),
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scraper.getText(),
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scraper.getAnchors(),
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scraper.getRSS(),
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noDoubleImages,
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scraper.indexingDenied(),
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scraper.getDate());
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ppd.setScraperObject(scraper);
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ppd.setIcons(scraper.getIcons());
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return ppd;
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}
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public static ContentScraper parseToScraper(final DigestURL location, final String documentCharset, final VocabularyScraper vocabularyScraper, final int timezoneOffset, final String input, final int maxLinks) throws IOException {
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Charset[] detectedcharsetcontainer = new Charset[]{null};
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InputStream sourceStream;
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try {
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sourceStream = new ByteArrayInputStream(documentCharset == null ? UTF8.getBytes(input) : input.getBytes(documentCharset));
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} catch (UnsupportedEncodingException e) {
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sourceStream = new ByteArrayInputStream(UTF8.getBytes(input));
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}
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ContentScraper scraper; // for this static methode no need to init local this.scraperObject
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try {
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scraper = parseToScraper(location, documentCharset, vocabularyScraper, detectedcharsetcontainer, timezoneOffset, sourceStream, maxLinks);
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} catch (Failure e) {
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throw new IOException(e.getMessage());
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}
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return scraper;
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}
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public static ContentScraper parseToScraper(
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final DigestURL location,
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final String documentCharset,
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final VocabularyScraper vocabularyScraper,
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Charset[] detectedcharsetcontainer,
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final int timezoneOffset,
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InputStream sourceStream,
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final int maxLinks) throws Parser.Failure, IOException {
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// make a scraper
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String charset = null;
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// ah, we are lucky, we got a character-encoding via HTTP-header
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if (documentCharset != null) {
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charset = patchCharsetEncoding(documentCharset);
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}
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// nothing found: try to find a meta-tag
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if (charset == null) {
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ScraperInputStream htmlFilter = null;
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try {
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htmlFilter = new ScraperInputStream(sourceStream, documentCharset, vocabularyScraper, location, null, false, maxLinks, timezoneOffset);
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sourceStream = htmlFilter;
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charset = htmlFilter.detectCharset();
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} catch (final IOException e1) {
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throw new Parser.Failure("Charset error:" + e1.getMessage(), location);
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} finally {
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if (htmlFilter != null) htmlFilter.close();
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}
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}
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// the author didn't tell us the encoding, try the mozilla-heuristic
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if (charset == null) {
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final CharsetDetector det = new CharsetDetector();
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det.enableInputFilter(true);
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final InputStream detStream = new BufferedInputStream(sourceStream);
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det.setText(detStream);
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charset = det.detect().getName();
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sourceStream = detStream;
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}
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// wtf? still nothing, just take system-standard
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if (charset == null) {
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detectedcharsetcontainer[0] = Charset.defaultCharset();
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} else {
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try {
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detectedcharsetcontainer[0] = Charset.forName(charset);
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} catch (final IllegalCharsetNameException e) {
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detectedcharsetcontainer[0] = Charset.defaultCharset();
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} catch (final UnsupportedCharsetException e) {
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detectedcharsetcontainer[0] = Charset.defaultCharset();
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}
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}
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// parsing the content
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// for this static methode no need to init local this.scraperObject here
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final ContentScraper scraper = new ContentScraper(location, maxLinks, vocabularyScraper, timezoneOffset);
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final TransformerWriter writer = new TransformerWriter(null,null,scraper,null,false, Math.max(64, Math.min(4096, sourceStream.available())));
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try {
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FileUtils.copy(sourceStream, writer, detectedcharsetcontainer[0]);
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} catch (final IOException e) {
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throw new Parser.Failure("IO error:" + e.getMessage(), location);
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} finally {
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writer.flush();
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//sourceStream.close(); keep open for multipe parsing (close done by caller)
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writer.close();
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}
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//OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);
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//serverFileUtils.copy(sourceFile, hfos);
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//hfos.close();
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if (writer.binarySuspect()) {
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final String errorMsg = "Binary data found in resource";
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throw new Parser.Failure(errorMsg, location);
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}
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return scraper;
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}
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/**
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* some html authors use wrong encoding names, either because they don't know exactly what they
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* are doing or they produce a type. Many times, the upper/downcase scheme of the name is fuzzy
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* This method patches wrong encoding names. The correct names are taken from
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* http://www.iana.org/assignments/character-sets
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* @param encoding
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* @return patched encoding name
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*/
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public static String patchCharsetEncoding(String encoding) {
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// do nothing with null
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if ((encoding == null) || (encoding.length() < 3)) return null;
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// trim encoding string
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encoding = encoding.trim();
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// fix upper/lowercase
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encoding = encoding.toUpperCase();
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if (encoding.startsWith("SHIFT")) return "Shift_JIS";
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if (encoding.startsWith("BIG")) return "Big5";
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// all other names but such with "windows" use uppercase
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if (encoding.startsWith("WINDOWS")) encoding = "windows" + encoding.substring(7);
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if (encoding.startsWith("MACINTOSH")) encoding = "MacRoman";
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// fix wrong fill characters
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encoding = CommonPattern.UNDERSCORE.matcher(encoding).replaceAll("-");
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if (encoding.matches("GB[_-]?2312([-_]80)?")) return "GB2312";
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if (encoding.matches(".*UTF[-_]?8.*")) return StandardCharsets.UTF_8.name();
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if (encoding.startsWith("US")) return StandardCharsets.US_ASCII.name();
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if (encoding.startsWith("KOI")) return "KOI8-R";
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// patch missing '-'
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if (encoding.startsWith("windows") && encoding.length() > 7) {
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final char c = encoding.charAt(7);
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if ((c >= '0') && (c <= '9')) {
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encoding = "windows-" + encoding.substring(7);
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}
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}
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if (encoding.startsWith("ISO")) {
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// patch typos
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if (encoding.length() > 3) {
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final char c = encoding.charAt(3);
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if ((c >= '0') && (c <= '9')) {
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encoding = "ISO-" + encoding.substring(3);
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}
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}
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if (encoding.length() > 8) {
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final char c = encoding.charAt(8);
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if ((c >= '0') && (c <= '9')) {
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encoding = encoding.substring(0, 8) + "-" + encoding.substring(8);
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}
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}
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}
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// patch wrong name
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if (encoding.startsWith("ISO-8559")) {
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// popular typo
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encoding = "ISO-8859" + encoding.substring(8);
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}
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// converting cp\d{4} -> windows-\d{4}
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if (encoding.matches("CP([_-])?125[0-8]")) {
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final char c = encoding.charAt(2);
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if ((c >= '0') && (c <= '9')) {
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encoding = "windows-" + encoding.substring(2);
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} else {
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encoding = "windows" + encoding.substring(2);
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}
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}
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return encoding;
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}
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/**
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* Implementation of ajax crawling scheme to crawl the content of html snapshot page
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* instead of the (empty) original ajax url
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* see https://developers.google.com/webmasters/ajax-crawling/docs/specification
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* Ajax crawling sheme is denoted by url with anchor param starting with "!" (1)
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* or by a header tag <meta name="fragment" content="!"/>
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*
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* It is expected that the check for ajax crawling scheme happend already so we can directly
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* try to get the snapshot page
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*
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* @param location original url (ajax url)
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* @param mimeType
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* @param documentCharset
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* @param vocscraper
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* @param timezoneOffset
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* @return document as result of parsed snapshot or null if not exist or on any other issue with snapshot
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*/
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private Document parseAlternativeSnapshot(final DigestURL location, final String mimeType, final String documentCharset,
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final VocabularyScraper vocscraper, final int timezoneOffset) {
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Document documentSnapshot = null;
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try {
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// construct url for case (1) with anchor
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final DigestURL locationSnapshot;
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if (location.getRef() != null && !location.getRef().isEmpty() && location.getRef().startsWith("!")) {
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if (location.getSearchpart().isEmpty()) {
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// according to spec hashfragment to be escaped
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locationSnapshot = new DigestURL(location.toNormalform(true) + "?_escaped_fragment_=" + MultiProtocolURL.escape(location.getRef().substring(1)));
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} else {
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locationSnapshot = new DigestURL(location.toNormalform(true) + "&_escaped_fragment_=" + MultiProtocolURL.escape(location.getRef().substring(1)).toString());
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}
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} else { // construct url for case (2) - no anchor but header tag fragment="!"
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locationSnapshot = new DigestURL(location.toNormalform(true) + "?_escaped_fragment_=");
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}
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Charset[] detectedcharsetcontainer = new Charset[]{null};
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InputStream snapshotStream = null;
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try {
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snapshotStream = locationSnapshot.getInputStream(ClientIdentification.yacyInternetCrawlerAgent);
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ContentScraper scraperSnapshot = parseToScraper(location, documentCharset, vocscraper, detectedcharsetcontainer, timezoneOffset, snapshotStream, maxLinks);
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documentSnapshot = transformScraper(location, mimeType, detectedcharsetcontainer[0].name(), scraperSnapshot);
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} finally {
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if(snapshotStream != null) {
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try {
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snapshotStream.close();
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} catch(IOException e) {
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AbstractParser.log.warn("Could not close snapshot stream : " + e.getMessage());
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}
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}
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}
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AbstractParser.log.info("parse snapshot "+locationSnapshot.toString() + " additional to " + location.toString());
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} catch (IOException | Failure ex) { }
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return documentSnapshot;
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}
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public static void main(final String[] args) {
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// test parsing of a url
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DigestURL url;
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try {
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url = new DigestURL(args[0]);
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final byte[] content = url.get(ClientIdentification.yacyInternetCrawlerAgent, null, null);
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final Document[] document = new htmlParser().parse(url, "text/html", StandardCharsets.UTF_8.name(), new VocabularyScraper(), 0, new ByteArrayInputStream(content));
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final String title = document[0].dc_title();
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System.out.println(title);
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} catch (final MalformedURLException e) {
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e.printStackTrace();
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} catch (final IOException e) {
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e.printStackTrace();
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} catch (final Parser.Failure e) {
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e.printStackTrace();
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} catch (final InterruptedException e) {
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e.printStackTrace();
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}
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System.exit(0);
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}
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}
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