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/**
* FileLoader
* Copyright 2010 by Michael Peter Christen
* First released 25.5.2010 at http://yacy.net
*
* $LastChangedDate$
* $LastChangedRevision$
* $LastChangedBy$
*
* 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.crawler.retrieval;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import net.yacy.cora.document.analysis.Classification;
import net.yacy.cora.document.encoding.ASCII;
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.protocol.ClientIdentification;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.protocol.ResponseHeader;
import net.yacy.cora.protocol.ftp.FTPClient;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.cora.util.StrictLimitInputStream;
import net.yacy.crawler.data.CrawlProfile;
import net.yacy.document.TextParser;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.search.Switchboard;
public class FileLoader {
/** Default maximum file size allowed for the crawler */
public static final int DEFAULT_MAXFILESIZE = 100000000;
private final Switchboard sb;
private final ConcurrentLog log;
private final int maxFileSize;
public FileLoader(final Switchboard sb, final ConcurrentLog log) {
this.sb = sb;
this.log = log;
this.maxFileSize = sb.getConfigInt("crawler.file.maxFileSize", DEFAULT_MAXFILESIZE);
}
/**
* Load fully the requested file in a byte buffer
*
* @param request the request to process
* @param acceptOnlyParseable when true and no parser can be found to handle the detected MIME type, the response content buffer contains only URL tokens
* @return a response with full meta data and embedding the content as a byte buffer
*/
public Response load(final Request request, boolean acceptOnlyParseable) throws IOException {
StreamResponse streamResponse = openInputStream(request, acceptOnlyParseable);
/* Read fully the stream and update the response */
byte[] content = FileUtils.read(streamResponse.getContentStream());
Response response = streamResponse.getResponse();
response.setContent(content);
return response;
}
/**
* Open a stream on the requested file. When actual file size is over maxBytes, return a stream on metadata only (URL tokens).
*
* @param request the request to process
* @param acceptOnlyParseable when true and no parser can be found to handle the detected MIME type, open a stream on the URL tokens
* @param maxBytes max file size to load. -1 means no limit.
* @return a response with full meta data and embedding on open input stream on content. Don't forget to close the stream.
*/
public StreamResponse openInputStream(final Request request, final boolean acceptOnlyParseable, final int maxBytes) throws IOException {
DigestURL url = request.url();
if (!url.getProtocol().equals("file")) throw new IOException("wrong protocol for FileLoader: " + url.getProtocol());
RequestHeader requestHeader = null;
if (request.referrerhash() != null) {
DigestURL ur = this.sb.getURL(request.referrerhash());
if (ur != null) {
requestHeader = new RequestHeader();
requestHeader.put(RequestHeader.REFERER, ur.toNormalform(true));
}
}
// process directories: transform them to html with meta robots=noindex (using the ftpc lib)
String[] l = null;
try {l = url.list();} catch (final IOException e) {}
if (l != null) {
String u = url.toNormalform(true);
List<String> list = new ArrayList<String>();
for (String s: l) {
list.add(u + ((u.endsWith("/") || u.endsWith("\\")) ? "" : "/") + s);
}
StringBuilder content = FTPClient.dirhtml(u, null, null, null, list, true);
ResponseHeader responseHeader = new ResponseHeader(200);
responseHeader.put(HeaderFramework.LAST_MODIFIED, HeaderFramework.formatRFC1123(new Date(url.lastModified())));
responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/html");
final CrawlProfile profile = this.sb.crawler.get(ASCII.getBytes(request.profileHandle()));
Response response = new Response(
request,
requestHeader,
responseHeader,
profile,
false,
null);
return new StreamResponse(response, new ByteArrayInputStream(UTF8.getBytes(content.toString())));
}
// create response header
String mime = Classification.ext2mime(MultiProtocolURL.getFileExtension(url.getFileName()));
ResponseHeader responseHeader = new ResponseHeader(200);
responseHeader.put(HeaderFramework.LAST_MODIFIED, HeaderFramework.formatRFC1123(new Date(url.lastModified())));
responseHeader.put(HeaderFramework.CONTENT_TYPE, mime);
// check mime type and availability of parsers
// and also check resource size and limitation of the size
long size;
try {
size = url.length();
responseHeader.put(HeaderFramework.CONTENT_LENGTH, Long.toString(size));
} catch (final Exception e) {
size = -1;
}
String parserError = null;
if ((acceptOnlyParseable && (parserError = TextParser.supports(url, mime)) != null) ||
(size > maxBytes && maxBytes >= 0)) {
// we know that we cannot process that file before loading
// only the metadata is returned
if (parserError != null) {
this.log.info("No parser available in File crawler: '" + parserError + "' for URL " + request.url().toNormalform(false) + ": parsing only metadata");
} else {
this.log.info("Too big file in File crawler with size = " + size + " Bytes for URL " + request.url().toNormalform(false) + ": parsing only metadata");
}
// create response with metadata only
responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/plain");
final CrawlProfile profile = this.sb.crawler.get(ASCII.getBytes(request.profileHandle()));
Response response = new Response(
request,
requestHeader,
responseHeader,
profile,
false,
null);
return new StreamResponse(response, new ByteArrayInputStream(UTF8.getBytes(url.toTokens())));
}
// load the resource
InputStream is = url.getInputStream(ClientIdentification.yacyInternetCrawlerAgent);
if(size < 0 && maxBytes >= 0) {
/* If content length is unknown for some reason, let's apply now the eventual size restriction */
is = new StrictLimitInputStream(is, maxBytes,
"Too big file in File crawler for URL " + request.url().toString());
}
// create response with stream open on content
final CrawlProfile profile = this.sb.crawler.get(ASCII.getBytes(request.profileHandle()));
Response response = new Response(
request,
requestHeader,
responseHeader,
profile,
false,
null);
return new StreamResponse(response, is);
}
/**
* Open a stream on the requested file
*
* @param request the request to process
* @param acceptOnlyParseable when true and no parser can be found to handle the detected MIME type, open a stream on the URL tokens
* @return a response with full meta data and embedding on open input stream on content. Don't forget to close the stream.
*/
public StreamResponse openInputStream(final Request request, final boolean acceptOnlyParseable) throws IOException {
return openInputStream(request, acceptOnlyParseable, this.maxFileSize);
}
}
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