001    /**
002     * Copyright (c) 2000-2012 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.sharepoint;
016    
017    import com.liferay.portal.kernel.servlet.HttpHeaders;
018    import com.liferay.portal.kernel.servlet.HttpMethods;
019    import com.liferay.portal.kernel.util.GetterUtil;
020    import com.liferay.portal.servlet.filters.secure.SecureFilter;
021    
022    import javax.servlet.FilterChain;
023    import javax.servlet.FilterConfig;
024    import javax.servlet.http.HttpServletRequest;
025    import javax.servlet.http.HttpServletResponse;
026    
027    /**
028     * @author Bruno Farache
029     * @author Alexander Chow
030     */
031    public class SharepointFilter extends SecureFilter {
032    
033            @Override
034            public void init(FilterConfig filterConfig) {
035                    super.init(filterConfig);
036    
037                    setUsePermissionChecker(true);
038            }
039    
040            protected boolean isSharepointRequest(String uri) {
041                    if (uri == null) {
042                            return false;
043                    }
044    
045                    if (uri.endsWith("*.asmx")) {
046                            return true;
047                    }
048    
049                    for (String prefix : _PREFIXES) {
050                            if (uri.startsWith(prefix)) {
051                                    return true;
052                            }
053                    }
054    
055                    return false;
056            }
057    
058            @Override
059            protected void processFilter(
060                            HttpServletRequest request, HttpServletResponse response,
061                            FilterChain filterChain)
062                    throws Exception {
063    
064                    String method = request.getMethod();
065    
066                    String userAgent = GetterUtil.getString(
067                            request.getHeader(HttpHeaders.USER_AGENT));
068    
069                    if ((userAgent.startsWith(
070                                    "Microsoft Data Access Internet Publishing") ||
071                             userAgent.startsWith("Microsoft Office Protocol Discovery")) &&
072                            method.equals(HttpMethods.OPTIONS)) {
073    
074                            setOptionsHeaders(response);
075    
076                            return;
077                    }
078    
079                    if (!isSharepointRequest(request.getRequestURI())) {
080                            processFilter(
081                                    SharepointFilter.class, request, response, filterChain);
082    
083                            return;
084                    }
085    
086                    if (method.equals(HttpMethods.GET) || method.equals(HttpMethods.HEAD)) {
087                            setGetHeaders(response);
088                    }
089                    else if (method.equals(HttpMethods.POST)) {
090                            setPostHeaders(response);
091                    }
092    
093                    super.processFilter(request, response, filterChain);
094            }
095    
096            protected void setGetHeaders(HttpServletResponse response) {
097                    response.setContentType("text/html");
098    
099                    response.setHeader(
100                            "Public-Extension", "http://schemas.microsoft.com/repl-2");
101                    response.setHeader(
102                            "MicrosoftSharePointTeamServices", SharepointUtil.VERSION);
103                    response.setHeader("Cache-Control", "no-cache");
104            }
105    
106            protected void setOptionsHeaders(HttpServletResponse response) {
107                    response.setHeader("MS-Author-Via", "MS-FP/4.0,DAV");
108                    response.setHeader("MicrosoftOfficeWebServer", "5.0_Collab");
109                    response.setHeader(
110                            "MicrosoftSharePointTeamServices", SharepointUtil.VERSION);
111                    response.setHeader("DAV", "1,2");
112                    response.setHeader("Accept-Ranges", "none");
113                    response.setHeader("Cache-Control", "no-cache");
114                    response.setHeader(
115                            "Allow",
116                            "COPY, DELETE, GET, GETLIB, HEAD, LOCK, MKCOL, MOVE, OPTIONS, " +
117                                    "POST, PROPFIND, PROPPATCH, PUT, UNLOCK");
118            }
119    
120            protected void setPostHeaders(HttpServletResponse response) {
121                    response.setContentType("application/x-vermeer-rpc");
122    
123                    response.setHeader(
124                            "MicrosoftSharePointTeamServices", SharepointUtil.VERSION);
125                    response.setHeader("Cache-Control", "no-cache");
126                    response.setHeader("Connection", "close");
127            }
128    
129            private static final String[] _PREFIXES =
130                    new String[] {
131                            "/_vti_inf.html", "/_vti_bin", "/sharepoint", "/history",
132                            "/resources"};
133    
134    }