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292 lines
11 KiB
292 lines
11 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.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.UnsupportedCharsetException;
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import java.util.regex.Pattern;
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import com.ibm.icu.text.CharsetDetector;
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import net.yacy.cora.document.MultiProtocolURI;
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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.parser.html.CharacterCoding;
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import net.yacy.document.parser.html.ContentScraper;
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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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public class htmlParser extends AbstractParser implements Parser {
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private static final Pattern patternUnderline = Pattern.compile("_");
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public htmlParser() {
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super("HTML Parser");
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SUPPORTED_EXTENSIONS.add("htm");
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SUPPORTED_EXTENSIONS.add("html");
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SUPPORTED_EXTENSIONS.add("shtml");
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SUPPORTED_EXTENSIONS.add("xhtml");
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SUPPORTED_EXTENSIONS.add("php");
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SUPPORTED_EXTENSIONS.add("php3");
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SUPPORTED_EXTENSIONS.add("php4");
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SUPPORTED_EXTENSIONS.add("php5");
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SUPPORTED_EXTENSIONS.add("cfm");
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SUPPORTED_EXTENSIONS.add("asp");
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SUPPORTED_EXTENSIONS.add("aspx");
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SUPPORTED_EXTENSIONS.add("tex");
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SUPPORTED_EXTENSIONS.add("txt");
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SUPPORTED_EXTENSIONS.add("jsp");
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SUPPORTED_EXTENSIONS.add("mf");
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SUPPORTED_EXTENSIONS.add("pl");
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SUPPORTED_EXTENSIONS.add("py");
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SUPPORTED_MIME_TYPES.add("text/html");
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SUPPORTED_MIME_TYPES.add("text/xhtml+xml");
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SUPPORTED_MIME_TYPES.add("application/xhtml+xml");
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SUPPORTED_MIME_TYPES.add("application/x-httpd-php");
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SUPPORTED_MIME_TYPES.add("application/x-tex");
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SUPPORTED_MIME_TYPES.add("text/plain");
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SUPPORTED_MIME_TYPES.add("text/sgml");
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SUPPORTED_MIME_TYPES.add("text/csv");
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}
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public static ContentScraper parseToScraper(
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final MultiProtocolURI location,
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final String documentCharset,
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InputStream sourceStream) 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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try {
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final ScraperInputStream htmlFilter = new ScraperInputStream(sourceStream,documentCharset,location,null,false);
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sourceStream = htmlFilter;
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charset = htmlFilter.detectCharset();
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} catch (IOException e1) {
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throw new Parser.Failure("Charset error:" + e1.getMessage(), location);
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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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CharsetDetector det = new CharsetDetector();
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det.enableInputFilter(true);
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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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charset = Charset.defaultCharset().name();
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}
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Charset c;
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try {
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c = Charset.forName(charset);
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} catch (IllegalCharsetNameException e) {
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c = Charset.defaultCharset();
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} catch (UnsupportedCharsetException e) {
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c = Charset.defaultCharset();
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}
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// parsing the content
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final ContentScraper scraper = new ContentScraper(location);
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final TransformerWriter writer = new TransformerWriter(null,null,scraper,null,false);
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try {
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FileUtils.copy(sourceStream, writer, c);
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writer.close();
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} catch (IOException e) {
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throw new Parser.Failure("IO error:" + e.getMessage(), location);
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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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public Document[] parse(
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final MultiProtocolURI location,
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final String mimeType,
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final String documentCharset,
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final InputStream sourceStream) throws Parser.Failure, InterruptedException {
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try {
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return transformScraper(location, mimeType, documentCharset, parseToScraper(location, documentCharset, sourceStream));
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} catch (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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private static Document[] transformScraper(final MultiProtocolURI location, final String mimeType, final String charSet, final ContentScraper scraper) {
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final String[] sections = new String[scraper.getHeadlines(1).length + scraper.getHeadlines(2).length + scraper.getHeadlines(3).length + scraper.getHeadlines(4).length];
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int p = 0;
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for (int i = 1; i <= 4; 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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final Document[] ppds = new Document[]{new Document(
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location,
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mimeType,
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charSet,
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scraper.getContentLanguages(),
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scraper.getKeywords(),
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scraper.getTitle(),
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scraper.getAuthor(),
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scraper.getPublisher(),
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sections,
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scraper.getDescription(),
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scraper.getText(),
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scraper.getAnchors(),
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scraper.getRSS(),
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scraper.getImages(),
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scraper.indexingDenied())};
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//scraper.close();
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for (final Document ppd: ppds) {
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ppd.setFavicon(scraper.getFavicon());
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}
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return ppds;
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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 = patternUnderline.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 "UTF-8";
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if (encoding.startsWith("US")) return "US-ASCII";
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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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public static void main(String[] args) {
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// test parsing of a url
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MultiProtocolURI url;
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try {
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url = new MultiProtocolURI(args[0]);
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byte[] content = url.get(MultiProtocolURI.yacybotUserAgent, 3000);
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Document[] document = new htmlParser().parse(url, "text/html", null, new ByteArrayInputStream(content));
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String title = document[0].dc_title();
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System.out.println(title);
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System.out.println(CharacterCoding.unicode2html(title, false));
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} catch (MalformedURLException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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} catch (Parser.Failure e) {
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e.printStackTrace();
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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