001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.webengine.servlet;
023
024import java.io.IOException;
025import java.io.InputStream;
026import java.io.OutputStream;
027
028import javax.servlet.ServletException;
029import javax.servlet.http.HttpServlet;
030import javax.servlet.http.HttpServletRequest;
031import javax.servlet.http.HttpServletResponse;
032
033import org.apache.commons.logging.Log;
034import org.apache.commons.logging.LogFactory;
035import org.nuxeo.common.utils.FileUtils;
036import org.nuxeo.ecm.webengine.WebEngine;
037import org.nuxeo.ecm.webengine.model.Module;
038import org.nuxeo.ecm.webengine.scripting.ScriptFile;
039import org.nuxeo.runtime.api.Framework;
040
041/**
042 * Servlet for accessing common file resources
043 *
044 * @author <a href="mailto:bs@nuxeo.com">Stefanescu Bogdan</a>
045 */
046public class ResourceServlet extends HttpServlet {
047
048    protected static final Log log = LogFactory.getLog(ResourceServlet.class);
049
050    private static final long serialVersionUID = 6548084847887645044L;
051
052    @Override
053    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
054        WebEngine engine = Framework.getService(WebEngine.class);
055        String path = req.getPathInfo();
056        if (path == null) {
057            resp.sendError(404);
058            return;
059        }
060        int p = path.indexOf('/', 1);
061        String moduleName = null;
062        if (p > -1) {
063            moduleName = path.substring(1, p);
064            path = path.substring(p);
065        } else {
066            resp.sendError(404);
067            return;
068        }
069
070        Module module = engine.getModule(moduleName);
071        if (module == null) {
072            resp.sendError(404);
073            return;
074        }
075
076        try {
077            service(req, resp, module, "/resources" + path);
078        } catch (IOException e) {
079            log.error("Unable to serve resource for " + path, e);
080            resp.sendError(404);
081        }
082    }
083
084    protected void service(HttpServletRequest req, HttpServletResponse resp, Module module, String path)
085            throws IOException {
086
087        ScriptFile file = module.getSkinResource(path);
088        if (file != null) {
089            long lastModified = file.lastModified();
090            resp.setDateHeader("Last-Modified:", lastModified);
091            resp.addHeader("Cache-Control", "public");
092            resp.addHeader("Server", "Nuxeo/WebEngine-1.0");
093
094            WebEngine engine = Framework.getService(WebEngine.class);
095            String mimeType = engine.getMimeType(file.getExtension());
096            if (mimeType == null) {
097                mimeType = "text/plain";
098            }
099            resp.setContentType(mimeType);
100            if (mimeType.startsWith("text/")) {
101                sendTextContent(file, resp);
102            } else {
103                sendBinaryContent(file, resp);
104            }
105            return;
106        }
107        resp.sendError(404);
108    }
109
110    protected static void sendBinaryContent(ScriptFile file, HttpServletResponse resp) throws IOException {
111        OutputStream out = resp.getOutputStream();
112        InputStream in = file.getInputStream();
113        try {
114            FileUtils.copy(in, out);
115        } finally {
116            in.close();
117        }
118        out.flush();
119    }
120
121    protected static void sendTextContent(ScriptFile file, HttpServletResponse resp) throws IOException {
122        // Writer out = resp.getWriter();
123        OutputStream out = resp.getOutputStream();
124        InputStream in = file.getInputStream();
125        try {
126            FileUtils.copy(in, out);
127        } finally {
128            in.close();
129        }
130        out.flush();
131    }
132
133}