// FTPLoader.java
// -------------------------------------
// part of YACY
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2006
//
// This file ist contributed by Martin Thelian
//
// $LastChangedDate: 2006-02-20 23:57:42 +0100 (Mo, 20 Feb 2006) $
// $LastChangedRevision: 1715 $
// $LastChangedBy: theli $
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.crawler.retrieval;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Date;
import net.yacy.cora.document.MultiProtocolURI;
import net.yacy.document.TextParser;
import net.yacy.kelondro.data.meta.DigestURI;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.util.DateFormatter;
import de.anomic.crawler.Latency;
import de.anomic.http.server.HeaderFramework;
import de.anomic.http.server.RequestHeader;
import de.anomic.http.server.ResponseHeader;
import de.anomic.net.ftpc;
import de.anomic.search.Segments;
import de.anomic.search.Switchboard;
public class FTPLoader {
private final Switchboard sb;
private final Log log;
private final int maxFileSize;
public FTPLoader(final Switchboard sb, final Log log) {
this.sb = sb;
this.log = log;
this.maxFileSize = (int) sb.getConfigLong("crawler.ftp.maxFileSize", -1l);
}
/**
* Loads the entry from a ftp-server
*
* @param request
* @return
*/
public Response load(final Request request, boolean acceptOnlyParseable) throws IOException {
long start = System.currentTimeMillis();
final DigestURI entryUrl = request.url();
final String fullPath = getPath(entryUrl);
// the return value
Response response = null;
// determine filename and path
String file, path;
if (fullPath.endsWith("/")) {
file = "";
path = fullPath;
} else {
final int pos = fullPath.lastIndexOf("/");
if (pos == -1) {
file = fullPath;
path = "/";
} else {
path = fullPath.substring(0, pos + 1);
file = fullPath.substring(pos + 1);
}
}
assert path.endsWith("/") : "FTPLoader: path is not a path: '" + path + "'";
// stream for ftp-client errors
final ByteArrayOutputStream berr = new ByteArrayOutputStream();
// create new ftp client
final PrintStream err = new PrintStream(berr);
final ftpc ftpClient = new ftpc(System.in, null, err);
ftpClient.setDataTimeoutByMaxFilesize(maxFileSize);
// get a connection
if (openConnection(ftpClient, entryUrl)) {
// test if the specified file is a directory
if (file.length() > 0) {
ftpClient.exec("cd \"" + path + "\"", false);
final boolean isFolder = ftpClient.isFolder(file);
if (isFolder) {
path = fullPath + "/";
file = "";
}
}
if (file.length() == 0) {
// directory -> get list of files
RequestHeader requestHeader = new RequestHeader();
if (request.referrerhash() != null) {
DigestURI u = sb.getURL(Segments.Process.LOCALCRAWLING, request.referrerhash());
if (u != null) requestHeader.put(RequestHeader.REFERER, u.toNormalform(true, false));
}
StringBuilder dirList = ftpClient.dirhtml(path);
if (dirList == null) {
response = null;
} else {
ResponseHeader responseHeader = new ResponseHeader();
responseHeader.put(HeaderFramework.LAST_MODIFIED, DateFormatter.formatRFC1123(new Date()));
responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/html");
response = new Response(
request,
requestHeader,
responseHeader,
"200",
sb.crawler.profilesActiveCrawls.getEntry(request.profileHandle()),
dirList.toString().getBytes());
}
} else {
// file -> download
try {
response = getFile(ftpClient, request, acceptOnlyParseable);
} catch (final Exception e) {
// add message to errorLog
(new PrintStream(berr)).print(e.getMessage());
}
}
closeConnection(ftpClient);
}
// pass the downloaded resource to the cache manager
if (berr.size() > 0 || response == null) {
// some error logging
final String detail = (berr.size() > 0) ? "\n Errorlog: " + berr.toString() : "";
sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "server download" + detail);
throw new IOException("FTPLoader: Unable to download URL " + request.url().toString() + detail);
}
Latency.update(request.url(), System.currentTimeMillis() - start);
return response;
}
/**
* @param ftpClient
*/
private void closeConnection(final ftpc ftpClient) {
// closing connection
ftpClient.exec("close", false);
ftpClient.exec("exit", false);
}
/**
* establish a connection to the ftp server (open, login, set transfer mode)
*/
private boolean openConnection(final ftpc ftpClient, final DigestURI entryUrl) {
// get username and password
final String userInfo = entryUrl.getUserInfo();
String userName = "anonymous", userPwd = "anonymous";
if (userInfo != null) {
final int pos = userInfo.indexOf(":");
if (pos != -1) {
userName = userInfo.substring(0, pos);
userPwd = userInfo.substring(pos + 1);
}
}
// get server name and port
final String host = entryUrl.getHost();
final int port = entryUrl.getPort();
// open a connection to the ftp server
if (port == -1) {
ftpClient.exec("open " + host, false);
} else {
ftpClient.exec("open " + host + " " + port, false);
}
if (ftpClient.notConnected()) {
return false;
}
// login to the server
ftpClient.exec("user " + userName + " " + userPwd, false);
if (ftpClient.isLoggedIn()) {
// change transfer mode to binary
ftpClient.exec("binary", false);
} else {
return false;
}
return true;
}
private Response getFile(final ftpc ftpClient, final Request request, boolean acceptOnlyParseable) throws Exception {
// determine the mimetype of the resource
final DigestURI url = request.url();
final String mime = TextParser.mimeOf(url);
final String path = getPath(url);
// determine the file date
final Date fileDate = ftpClient.entryDate(path);
// create response header
RequestHeader requestHeader = new RequestHeader();
if (request.referrerhash() != null) requestHeader.put(RequestHeader.REFERER, sb.getURL(Segments.Process.LOCALCRAWLING, request.referrerhash()).toNormalform(true, false));
ResponseHeader responseHeader = new ResponseHeader();
responseHeader.put(HeaderFramework.LAST_MODIFIED, DateFormatter.formatRFC1123(fileDate));
responseHeader.put(HeaderFramework.CONTENT_TYPE, mime);
// if the mimetype and file extension is supported we start to download the file
final int size = ftpClient.fileSize(path);
String parserError = null;
if ((acceptOnlyParseable && (parserError = TextParser.supports(url, mime)) != null) ||
(size > maxFileSize && maxFileSize >= 0)) {
// we know that we cannot process that file before loading
// only the metadata is returned
if (parserError != null) {
log.logInfo("No parser available in FTP crawler: '" + parserError + "' for URL " + request.url().toString() + ": parsing only metadata");
} else {
log.logInfo("Too big file in FTP crawler with size = " + size + " Bytes for URL " + request.url().toString() + ": parsing only metadata");
}
// create response with metadata only
responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/plain");
Response response = new Response(
request,
requestHeader,
responseHeader,
"200",
sb.crawler.profilesActiveCrawls.getEntry(request.profileHandle()),
url.toNormalform(true, true).getBytes());
return response;
}
// timeout for download
ftpClient.setDataTimeoutByMaxFilesize(size);
// download the remote file
byte[] b = ftpClient.get(path);
// create a response
Response response = new Response(
request,
requestHeader,
responseHeader,
"200",
sb.crawler.profilesActiveCrawls.getEntry(request.profileHandle()),
b);
return response;
}
/**
* gets path suitable for FTP (url-decoded, double-quotes escaped)
*
* @param entryUrl
* @return
*/
private String getPath(final MultiProtocolURI entryUrl) {
return MultiProtocolURI.unescape(entryUrl.getPath()).replace("\"", "\"\"");
}
}