001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.webdav;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.servlet.HttpHeaders;
020    import com.liferay.portal.kernel.util.GetterUtil;
021    import com.liferay.portal.kernel.util.HttpUtil;
022    import com.liferay.portal.kernel.util.InstancePool;
023    import com.liferay.portal.kernel.util.Validator;
024    import com.liferay.portal.kernel.webdav.WebDAVException;
025    import com.liferay.portal.kernel.webdav.WebDAVRequest;
026    import com.liferay.portal.kernel.webdav.WebDAVStorage;
027    import com.liferay.portal.kernel.webdav.WebDAVUtil;
028    import com.liferay.portal.model.User;
029    import com.liferay.portal.security.auth.PrincipalThreadLocal;
030    import com.liferay.portal.security.permission.PermissionChecker;
031    import com.liferay.portal.security.permission.PermissionCheckerFactoryUtil;
032    import com.liferay.portal.security.permission.PermissionThreadLocal;
033    import com.liferay.portal.service.UserLocalServiceUtil;
034    import com.liferay.portal.util.PropsValues;
035    import com.liferay.portal.webdav.methods.Method;
036    import com.liferay.portal.webdav.methods.MethodFactory;
037    
038    import javax.servlet.http.HttpServlet;
039    import javax.servlet.http.HttpServletRequest;
040    import javax.servlet.http.HttpServletResponse;
041    
042    /**
043     * @author Brian Wing Shun Chan
044     * @author Alexander Chow
045     */
046    public class WebDAVServlet extends HttpServlet {
047    
048            public void service(
049                    HttpServletRequest request, HttpServletResponse response) {
050    
051                    int status = HttpServletResponse.SC_PRECONDITION_FAILED;
052    
053                    String userAgent = request.getHeader(HttpHeaders.USER_AGENT);
054    
055                    if (_log.isDebugEnabled()) {
056                            _log.debug("User agent " + userAgent);
057                    }
058    
059                    try {
060                            if (isIgnoredResource(request)) {
061                                    status = HttpServletResponse.SC_NOT_FOUND;
062    
063                                    return;
064                            }
065    
066                            WebDAVStorage storage = getStorage(request);
067    
068                            if (storage == null) {
069                                    if (_log.isDebugEnabled()) {
070                                            _log.debug("Invalid WebDAV path " + request.getPathInfo());
071                                    }
072    
073                                    return;
074                            }
075    
076                            // Set the path only if it has not already been set. This works
077                            // if and only if the servlet is not mapped to more than one URL.
078    
079                            if (storage.getRootPath() == null) {
080                                    storage.setRootPath(getRootPath(request));
081                            }
082    
083                            PermissionChecker permissionChecker = null;
084    
085                            String remoteUser = request.getRemoteUser();
086    
087                            if (remoteUser != null) {
088                                    PrincipalThreadLocal.setName(remoteUser);
089    
090                                    long userId = GetterUtil.getLong(remoteUser);
091    
092                                    User user = UserLocalServiceUtil.getUserById(userId);
093    
094                                    permissionChecker = PermissionCheckerFactoryUtil.create(
095                                            user, true);
096    
097                                    PermissionThreadLocal.setPermissionChecker(permissionChecker);
098                            }
099    
100                            // Get the method instance
101    
102                            Method method = MethodFactory.create(request);
103    
104                            // Process the method
105    
106                            try {
107                                    WebDAVRequest webDavRequest = new WebDAVRequestImpl(
108                                            storage, request, response, userAgent, permissionChecker);
109    
110                                    status = method.process(webDavRequest);
111                            }
112                            catch (WebDAVException wde) {
113                                    if (_log.isWarnEnabled()) {
114                                            _log.warn(wde, wde);
115                                    }
116    
117                                    status = HttpServletResponse.SC_PRECONDITION_FAILED;
118                            }
119                    }
120                    catch (Exception e) {
121                            _log.error(e, e);
122                    }
123                    finally {
124                            response.setStatus(status);
125    
126                            if (_log.isInfoEnabled()) {
127                                    String xLitmus = GetterUtil.getString(
128                                            request.getHeader("X-Litmus"));
129    
130                                    if (Validator.isNotNull(xLitmus)) {
131                                            xLitmus += " ";
132                                    }
133    
134                                    _log.info(
135                                            xLitmus + request.getMethod() + " " +
136                                                    request.getRequestURI() + " " + status);
137                            }
138                    }
139            }
140    
141            protected String getRootPath(HttpServletRequest request) {
142                    String contextPath = HttpUtil.fixPath(
143                            request.getContextPath(), false, true);
144                    String ServletPath = HttpUtil.fixPath(
145                            request.getServletPath(), false, true);
146    
147                    return contextPath.concat(ServletPath);
148            }
149    
150            protected WebDAVStorage getStorage(HttpServletRequest request) {
151                    String[] pathArray = WebDAVUtil.getPathArray(
152                            request.getPathInfo(), true);
153    
154                    WebDAVStorage storage = null;
155    
156                    if (pathArray.length == 0) {
157                            storage = (WebDAVStorage)InstancePool.get(
158                                    CompanyWebDAVStorageImpl.class.getName());
159                    }
160                    else if (pathArray.length == 1) {
161                            storage = (WebDAVStorage)InstancePool.get(
162                                    GroupWebDAVStorageImpl.class.getName());
163                    }
164                    else if (pathArray.length >= 2) {
165                            storage = WebDAVUtil.getStorage(pathArray[1]);
166                    }
167    
168                    return storage;
169            }
170    
171            protected boolean isIgnoredResource(HttpServletRequest request) {
172                    String[] pathArray = WebDAVUtil.getPathArray(
173                            request.getPathInfo(), true);
174    
175                    if ((pathArray == null) || (pathArray.length == 0)) {
176                            return false;
177                    }
178    
179                    String resourceName = pathArray[pathArray.length - 1];
180    
181                    for (String ignore : PropsValues.WEBDAV_IGNORE) {
182                            if (ignore.equals(resourceName)) {
183                                    if (_log.isDebugEnabled()) {
184                                            _log.debug(
185                                                    "Skipping over " + request.getMethod() + " " +
186                                                            request.getPathInfo());
187                                    }
188    
189                                    return true;
190                            }
191                    }
192    
193                    return false;
194            }
195    
196            private static Log _log = LogFactoryUtil.getLog(WebDAVServlet.class);
197    
198    }