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286 lines
11 KiB
286 lines
11 KiB
// FTPLoader.java
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// -------------------------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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//
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// This file ist contributed by Martin Thelian
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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 program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.crawler.retrieval;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.PrintStream;
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import java.util.Date;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.protocol.ftp.FTPClient;
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import net.yacy.document.TextParser;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.search.Switchboard;
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import net.yacy.search.index.Segments;
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import de.anomic.crawler.CrawlProfile;
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import de.anomic.crawler.Latency;
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import de.anomic.crawler.ZURL.FailCategory;
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public class FTPLoader {
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public static final long DEFAULT_MAXFILESIZE = 1024 * 1024 * 10;
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private final Switchboard sb;
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private final Log log;
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private final long maxFileSize;
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public FTPLoader(final Switchboard sb, final Log log) {
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this.sb = sb;
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this.log = log;
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this.maxFileSize = sb.getConfigLong("crawler.ftp.maxFileSize", -1l);
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}
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/**
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* Loads the entry from a ftp-server
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*
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* @param request
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* @return
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*/
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public Response load(final Request request, boolean acceptOnlyParseable) throws IOException {
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long start = System.currentTimeMillis();
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final DigestURI entryUrl = request.url();
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final String fullPath = getPath(entryUrl);
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// the return value
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Response response = null;
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// determine filename and path
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String file, path;
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if (fullPath.endsWith("/")) {
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file = "";
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path = fullPath;
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} else {
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final int pos = fullPath.lastIndexOf("/");
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if (pos == -1) {
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file = fullPath;
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path = "/";
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} else {
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path = fullPath.substring(0, pos + 1);
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file = fullPath.substring(pos + 1);
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}
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}
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assert path.endsWith("/") : "FTPLoader: path is not a path: '" + path + "'";
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// stream for ftp-client errors
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final ByteArrayOutputStream berr = new ByteArrayOutputStream();
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// create new ftp client
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final FTPClient ftpClient = new FTPClient();
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// get a connection
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if (openConnection(ftpClient, entryUrl)) {
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// test if the specified file is a directory
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if (file.length() > 0) {
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ftpClient.exec("cd \"" + path + "\"", false);
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final boolean isFolder = ftpClient.isFolder(file);
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if (isFolder) {
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path = fullPath + "/";
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file = "";
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}
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}
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if (file.length() == 0) {
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// directory -> get list of files
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RequestHeader requestHeader = new RequestHeader();
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if (request.referrerhash() != null) {
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DigestURI u = sb.getURL(Segments.Process.LOCALCRAWLING, request.referrerhash());
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if (u != null) requestHeader.put(RequestHeader.REFERER, u.toNormalform(true, false));
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}
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StringBuilder dirList = ftpClient.dirhtml(path);
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if (dirList == null) {
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response = null;
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} else {
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ResponseHeader responseHeader = new ResponseHeader();
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responseHeader.put(HeaderFramework.LAST_MODIFIED, HeaderFramework.formatRFC1123(new Date()));
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responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/html");
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final CrawlProfile profile = sb.crawler.getActive(request.profileHandle().getBytes());
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response = new Response(
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request,
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requestHeader,
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responseHeader,
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"200",
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profile,
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dirList.toString().getBytes());
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}
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} else {
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// file -> download
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try {
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response = getFile(ftpClient, request, acceptOnlyParseable);
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} catch (final Exception e) {
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// add message to errorLog
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Log.logException(e);
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(new PrintStream(berr)).print(e.getMessage());
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}
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}
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closeConnection(ftpClient);
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}
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// pass the downloaded resource to the cache manager
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if (berr.size() > 0 || response == null) {
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// some error logging
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final String detail = (berr.size() > 0) ? "Errorlog: " + berr.toString() : "";
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, FailCategory.TEMPORARY_NETWORK_FAILURE, " ftp server download, " + detail, -1);
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throw new IOException("FTPLoader: Unable to download URL '" + request.url().toString() + "': " + detail);
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}
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Latency.update(request.url(), System.currentTimeMillis() - start);
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return response;
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}
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/**
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* @param ftpClient
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*/
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private void closeConnection(final FTPClient ftpClient) {
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// closing connection
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ftpClient.exec("close", false);
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ftpClient.exec("exit", false);
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}
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/**
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* establish a connection to the ftp server (open, login, set transfer mode)
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*/
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private boolean openConnection(final FTPClient ftpClient, final DigestURI entryUrl) {
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// get username and password
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final String userInfo = entryUrl.getUserInfo();
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String userName = "anonymous", userPwd = "anonymous";
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if (userInfo != null) {
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final int pos = userInfo.indexOf(":");
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if (pos != -1) {
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userName = userInfo.substring(0, pos);
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userPwd = userInfo.substring(pos + 1);
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}
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}
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// get server name and port
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final String host = entryUrl.getHost();
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final int port = entryUrl.getPort();
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// open a connection to the ftp server
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if (port == -1) {
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ftpClient.exec("open " + host, false);
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} else {
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ftpClient.exec("open " + host + " " + port, false);
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}
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if (ftpClient.notConnected()) {
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return false;
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}
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// login to the server
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ftpClient.exec("user " + userName + " " + userPwd, false);
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if (ftpClient.isLoggedIn()) {
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// change transfer mode to binary
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ftpClient.exec("binary", false);
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} else {
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return false;
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}
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return true;
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}
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private Response getFile(final FTPClient ftpClient, final Request request, boolean acceptOnlyParseable) throws IOException {
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// determine the mimetype of the resource
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final DigestURI url = request.url();
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final String mime = TextParser.mimeOf(url);
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final String path = getPath(url);
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// determine the file date
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final Date fileDate = ftpClient.entryDate(path);
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// create response header
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RequestHeader requestHeader = new RequestHeader();
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if (request.referrerhash() != null) {
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DigestURI refurl = sb.getURL(Segments.Process.LOCALCRAWLING, request.referrerhash());
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if (refurl != null) requestHeader.put(RequestHeader.REFERER, refurl.toNormalform(true, false));
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}
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ResponseHeader responseHeader = new ResponseHeader();
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responseHeader.put(HeaderFramework.LAST_MODIFIED, HeaderFramework.formatRFC1123(fileDate));
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responseHeader.put(HeaderFramework.CONTENT_TYPE, mime);
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// if the mimetype and file extension is supported we start to download the file
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final long size = ftpClient.fileSize(path);
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responseHeader.put(HeaderFramework.CONTENT_LENGTH, String.valueOf(size));
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String parserError = null;
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if ((acceptOnlyParseable && (parserError = TextParser.supports(url, mime)) != null) ||
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(size > maxFileSize && maxFileSize >= 0)) {
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// we know that we cannot process that file before loading
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// only the metadata is returned
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if (parserError != null) {
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log.logInfo("No parser available in FTP crawler: '" + parserError + "' for URL " + request.url().toString() + ": parsing only metadata");
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} else {
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log.logInfo("Too big file in FTP crawler with size = " + size + " Bytes for URL " + request.url().toString() + ": parsing only metadata");
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}
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// create response with metadata only
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responseHeader.put(HeaderFramework.CONTENT_TYPE, "text/plain");
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final CrawlProfile profile = sb.crawler.getActive(request.profileHandle().getBytes());
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Response response = new Response(
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request,
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requestHeader,
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responseHeader,
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"200",
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profile,
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null);
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return response;
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}
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// download the remote file
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byte[] b = ftpClient.get(path);
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// create a response
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final CrawlProfile profile = sb.crawler.getActive(request.profileHandle().getBytes());
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Response response = new Response(
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request,
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requestHeader,
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responseHeader,
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"200",
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profile,
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b);
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return response;
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}
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/**
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* gets path suitable for FTP (url-decoded, double-quotes escaped)
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*
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* @param entryUrl
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* @return
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*/
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private String getPath(final MultiProtocolURI entryUrl) {
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return MultiProtocolURI.unescape(entryUrl.getPath()).replace("\"", "\"\"");
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}
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}
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