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 *     Jean-Marc Orliaguet, Chalmers
018 *
019 * $Id$
020 */
021
022package org.nuxeo.theme.html.servlets;
023
024import java.io.IOException;
025import java.io.OutputStream;
026import java.io.Serializable;
027
028import javax.servlet.http.HttpServlet;
029import javax.servlet.http.HttpServletRequest;
030import javax.servlet.http.HttpServletResponse;
031
032import org.apache.commons.logging.Log;
033import org.apache.commons.logging.LogFactory;
034import org.nuxeo.common.utils.FileUtils;
035import org.nuxeo.ecm.core.io.download.BufferingServletOutputStream;
036import org.nuxeo.theme.Manager;
037import org.nuxeo.theme.html.Utils;
038import org.nuxeo.theme.themes.ThemeException;
039
040public final class Images extends HttpServlet implements Serializable {
041
042    private static final Log log = LogFactory.getLog(Images.class);
043
044    private static final long serialVersionUID = 1L;
045
046    @Override
047    protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws IOException {
048        doPost(request, response);
049    }
050
051    @Override
052    protected void doPost(final HttpServletRequest request, final HttpServletResponse response) throws IOException {
053
054        final String path = request.getPathInfo().substring(1);
055        byte[] data = null;
056        try {
057            data = Manager.getThemeManager().getImageResource(path);
058        } catch (ThemeException e) {
059            log.error("Image not found: " + path);
060        }
061        if (data != null) {
062            OutputStream os = response.getOutputStream();
063            BufferingServletOutputStream.stopBuffering(os);
064            String ext = FileUtils.getFileExtension(path);
065            String mimeType = Utils.getImageMimeType(ext);
066            response.addHeader("content-type", mimeType);
067
068            // Cache headers
069            final String lifetime = "604800"; // 1 week
070            final long now = System.currentTimeMillis();
071            response.addHeader("Cache-Control", "max-age=" + lifetime);
072            response.addHeader("Cache-Control", "must-revalidate");
073            response.setDateHeader("Last-Modified", now);
074            response.setDateHeader("Expires", now + new Long(lifetime) * 1000L);
075
076            os.write(data);
077            os.close();
078        }
079    }
080}