cmswebdavservlet.java

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/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/webdav/CmsWebdavServlet.java,v $
 * Date   : $Date: 2007-08-13 16:29:51 $
 * Version: $Revision: 1.5 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 2002 - 2007 Alkacon Software GmbH (http://www.alkacon.com)
 *
 * 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.
 *
 * For further information about Alkacon Software GmbH, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * This file is based on:
 * - org.apache.catalina.servlets.WebdavServlet
 * - org.apache.catalina.servlets.DefaultServlet
 * from the Apache Tomcat project.
 * 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.opencms.webdav;

import org.opencms.file.CmsVfsResourceAlreadyExistsException;
import org.opencms.file.CmsVfsResourceNotFoundException;
import org.opencms.i18n.CmsEncoder;
import org.opencms.main.CmsException;
import org.opencms.main.CmsLog;
import org.opencms.main.OpenCms;
import org.opencms.repository.CmsRepositoryLockInfo;
import org.opencms.repository.I_CmsRepository;
import org.opencms.repository.I_CmsRepositoryItem;
import org.opencms.repository.I_CmsRepositorySession;
import org.opencms.security.CmsSecurityException;
import org.opencms.util.CmsRequestUtil;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Date;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.Vector;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.net.URLCodec;
import org.apache.commons.logging.Log;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.Node;
import org.dom4j.QName;
import org.dom4j.io.SAXReader;
import org.xml.sax.InputSource;

/**
 * Servlet which adds support for WebDAV level 2.<p>
 *
 * @author Remy Maucherat
 * @author Craig R. McClanahan
 * @author Peter Bonrad
 * 
 * @version $Revision: 1.5 $
 * 
 * @since 6.5.6
 */
public class CmsWebdavServlet extends HttpServlet {

    /** Basic authorization prefix constant. */
    public static final String AUTHORIZATION_BASIC_PREFIX = "BASIC ";

    /** Size of file transfer buffer in bytes. */
    public static final int BUFFER_SIZE = 4096;

    /** Credentials separator constant. */
    public static final String SEPARATOR_CREDENTIALS = ":";

    /** Date format for the last modified date. */
    protected static final DateFormat HTTP_DATE_FORMAT;

    /** Date format for the creation date. */
    protected static final DateFormat ISO8601_FORMAT;

    /** MD5 message digest provider. */
    protected static MessageDigest m_md5Helper;

    /** The MD5 helper object for this class. */
    protected static final CmsMD5Encoder MD5_ENCODER = new CmsMD5Encoder();

    /** WebDAV method: COPY. */
    protected static final String METHOD_COPY = "COPY";

    /** HTTP Method: DELETE. */
    protected static final String METHOD_DELETE = "DELETE";

    /** HTTP Method: GET. */
    protected static final String METHOD_GET = "GET";

    /** HTTP Method: HEAD. */
    protected static final String METHOD_HEAD = "HEAD";

    /** WebDAV method: LOCK. */
    protected static final String METHOD_LOCK = "LOCK";

    /** WebDAV method: MKCOL. */
    protected static final String METHOD_MKCOL = "MKCOL";

    /** WebDAV method: MOVE. */
    protected static final String METHOD_MOVE = "MOVE";

    /** HTTP Method: OPTIONS. */
    protected static final String METHOD_OPTIONS = "OPTIONS";

    /** HTTP Method: POST. */
    protected static final String METHOD_POST = "POST";

    /** WebDAV method: PROPFIND. */
    protected static final String METHOD_PROPFIND = "PROPFIND";

    /** WebDAV method: PROPPATCH. */
    protected static final String METHOD_PROPPATCH = "PROPPATCH";

    /** HTTP Method: PUT. */
    protected static final String METHOD_PUT = "PUT";

    /** HTTP Method: TRACE. */
    protected static final String METHOD_TRACE = "TRACE";

    /** WebDAV method: UNLOCK. */
    protected static final String METHOD_UNLOCK = "UNLOCK";

    /** MIME multipart separation string. */
    protected static final String MIME_SEPARATION = "CATALINA_MIME_BOUNDARY";

    /** Chars which are safe for urls. */
    protected static final BitSet URL_SAFE_CHARS;

    /** Name of the servlet attribute to get the path to the temp directory. */
    private static final String ATT_SERVLET_TEMPDIR = "javax.servlet.context.tempdir";

    /** The text to use as basic realm. */
    private static final String BASIC_REALM = "OpenCms WebDAV Servlet";

    /** Default namespace. */
    private static final String DEFAULT_NAMESPACE = "DAV:";

    /** The text to send if the depth is inifinity. */
    private static final String DEPTH_INFINITY = "Infinity";

    /** PROPFIND - Display all properties. */
    private static final int FIND_ALL_PROP = 1;

    /** PROPFIND - Specify a property mask. */
    private static final int FIND_BY_PROPERTY = 0;

    /** PROPFIND - Return property names. */
    private static final int FIND_PROPERTY_NAMES = 2;

    /** Full range marker. */
    private static ArrayList FULL_RANGE = new ArrayList();

    /** The name of the header "allow". */
    private static final String HEADER_ALLOW = "Allow";

    /** The name of the header "authorization". */
    private static final String HEADER_AUTHORIZATION = "Authorization";

    /** The name of the header "content-length". */
    private static final String HEADER_CONTENTLENGTH = "content-length";

    /** The name of the header "Content-Range". */
    private static final String HEADER_CONTENTRANGE = "Content-Range";

    /** The name of the header "Depth". */
    private static final String HEADER_DEPTH = "Depth";

    /** The name of the header "Destination". */
    private static final String HEADER_DESTINATION = "Destination";

    /** The name of the header "ETag". */
    private static final String HEADER_ETAG = "ETag";

    /** The name of the header "If-Range". */
    private static final String HEADER_IFRANGE = "If-Range";

    /** The name of the header "Last-Modified". */
    private static final String HEADER_LASTMODIFIED = "Last-Modified";

    /** The name of the header "Lock-Token". */
    private static final String HEADER_LOCKTOKEN = "Lock-Token";

    /** The name of the header "Overwrite". */
    private static final String HEADER_OVERWRITE = "Overwrite";

    /** The name of the header "Range". */
    private static final String HEADER_RANGE = "Range";

    /** The name of the init parameter in the web.xml to allow listing. */
    private static final String INIT_PARAM_LIST = "listings";

    /** The name of the init parameter in the web.xml to set read only. */
    private static final String INIT_PARAM_READONLY = "readonly";

    /** The name of the init-param where the repository class is defined. */
    private static final String INIT_PARAM_REPOSITORY = "repository";

    /** Create a new lock. */
    private static final int LOCK_CREATION = 0;

    /** Refresh lock. */
    private static final int LOCK_REFRESH = 1;

    /** The log object for this class. */
    private static final Log LOG = CmsLog.getLog(CmsWebdavServlet.class);

    /** The repository used from this servlet. */
    private static I_CmsRepository m_repository;

    /** The unique serial id for this class. */
    private static final long serialVersionUID = -122598983283724306L;

    /** The name of the tag "activelock" in the WebDAV protocol. */
    private static final String TAG_ACTIVELOCK = "activelock";

    /** The name of the tag "collection" in the WebDAV protocol. */
    private static final String TAG_COLLECTION = "collection";

    /** The name of the tag "getcontentlanguage" in the WebDAV protocol. */
    private static final String TAG_CONTENTLANGUAGE = "getcontentlanguage";

    /** The name of the tag "getcontentlength" in the WebDAV protocol. */
    private static final String TAG_CONTENTLENGTH = "getcontentlength";

    /** The name of the tag "getcontenttype" in the WebDAV protocol. */
    private static final String TAG_CONTENTTYPE = "getcontenttype";

    /** The name of the tag "creationdate" in the WebDAV protocol. */
    private static final String TAG_CREATIONDATE = "creationdate";

    /** The name of the tag "depth" in the WebDAV protocol. */
    private static final String TAG_DEPTH = "depth";

    /** The name of the tag "displayname" in the WebDAV protocol. */
    private static final String TAG_DISPLAYNAME = "displayname";

    /** The name of the tag "getetag" in the WebDAV protocol. */
    private static final String TAG_ETAG = "getetag";

    /** The name of the tag "href" in the WebDAV protocol. */
    private static final String TAG_HREF = "href";

    /** The name of the tag "getlastmodified" in the WebDAV protocol. */
    private static final String TAG_LASTMODIFIED = "getlastmodified";

    /** The name of the tag "lockdiscovery" in the WebDAV protocol. */
    private static final String TAG_LOCKDISCOVERY = "lockdiscovery";

    /** The name of the tag "lockentry" in the WebDAV protocol. */
    private static final String TAG_LOCKENTRY = "lockentry";

    /** The name of the tag "lockscope" in the WebDAV protocol. */
    private static final String TAG_LOCKSCOPE = "lockscope";

    /** The name of the tag "locktoken" in the WebDAV protocol. */
    private static final String TAG_LOCKTOKEN = "locktoken";

    /** The name of the tag "locktype" in the WebDAV protocol. */
    private static final String TAG_LOCKTYPE = "locktype";

    /** The name of the tag "multistatus" in the WebDAV protocol. */
    private static final String TAG_MULTISTATUS = "multistatus";

    /** The name of the tag "owner" in the WebDAV protocol. */
    private static final String TAG_OWNER = "owner";

    /** The name of the tag "prop" in the WebDAV protocol. */
    private static final String TAG_PROP = "prop";

    /** The name of the tag "propstat" in the WebDAV protocol. */
    private static final String TAG_PROPSTAT = "propstat";

    /** The name of the tag "resourcetype" in the WebDAV protocol. */
    private static final String TAG_RESOURCETYPE = "resourcetype";

    /** The name of the tag "response" in the WebDAV protocol. */
    private static final String TAG_RESPONSE = "response";

    /** The name of the tag "source" in the WebDAV protocol. */
    private static final String TAG_SOURCE = "source";

    /** The name of the tag "status" in the WebDAV protocol. */
    private static final String TAG_STATUS = "status";

    /** The name of the tag "supportedlock" in the WebDAV protocol. */
    private static final String TAG_SUPPORTEDLOCK = "supportedlock";

    /** The name of the tag "timeout" in the WebDAV protocol. */
    private static final String TAG_TIMEOUT = "timeout";

    /** The text to send if the timeout is infinite. */
    private static final String TIMEOUT_INFINITE = "Infinite";

    /** The input buffer size to use when serving resources. */
    protected int m_input = 2048;

    /** The output buffer size to use when serving resources. */
    protected int m_output = 2048;

    /** Should we generate directory listings? */
    private boolean m_listings = false;

    /** Read only flag. By default, it's set to true. */
    private boolean m_readOnly = true;