| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. 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. For additional information regarding |
| * copyright in this work, please see the NOTICE file in the top level |
| * directory of this distribution. |
| */ |
| |
| package org.apache.roller.weblogger.ui.rendering.servlets; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.roller.util.RollerConstants; |
| import org.apache.roller.weblogger.WebloggerException; |
| import org.apache.roller.weblogger.business.MediaFileManager; |
| import org.apache.roller.weblogger.business.WebloggerFactory; |
| import org.apache.roller.weblogger.pojos.MediaFile; |
| import org.apache.roller.weblogger.pojos.Weblog; |
| import org.apache.roller.weblogger.ui.rendering.util.ModDateHeaderUtil; |
| import org.apache.roller.weblogger.ui.rendering.util.WeblogMediaResourceRequest; |
| |
| /** |
| * Serves media files uploaded by users. |
| * |
| * Since we keep resources in a location outside of the webapp context we need a |
| * way to serve them up. This servlet assumes that resources are stored on a |
| * filesystem in the "uploads.dir" directory. |
| */ |
| public class MediaResourceServlet extends HttpServlet { |
| |
| private static Log log = LogFactory.getLog(MediaResourceServlet.class); |
| |
| public void init(ServletConfig config) throws ServletException { |
| |
| super.init(config); |
| log.info("Initializing ResourceServlet"); |
| |
| } |
| |
| /** |
| * Handles requests for user uploaded media file resources. |
| */ |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| |
| MediaFileManager mfMgr = WebloggerFactory.getWeblogger() |
| .getMediaFileManager(); |
| |
| Weblog weblog; |
| |
| WeblogMediaResourceRequest resourceRequest; |
| try { |
| // parse the incoming request and extract the relevant data |
| resourceRequest = new WeblogMediaResourceRequest(request); |
| |
| weblog = resourceRequest.getWeblog(); |
| if (weblog == null) { |
| throw new WebloggerException("unable to lookup weblog: " |
| + resourceRequest.getWeblogHandle()); |
| } |
| |
| } catch (Exception e) { |
| // invalid resource request or weblog doesn't exist |
| log.debug("error creating weblog resource request", e); |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| long resourceLastMod; |
| InputStream resourceStream = null; |
| MediaFile mediaFile; |
| |
| try { |
| mediaFile = mfMgr.getMediaFile(resourceRequest.getResourceId(), |
| true); |
| resourceLastMod = mediaFile.getLastModified(); |
| |
| } catch (Exception ex) { |
| // still not found? then we don't have it, 404. |
| log.debug("Unable to get resource", ex); |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| // Respond with 304 Not Modified if it is not modified. |
| if (ModDateHeaderUtil.respondIfNotModified(request, response, |
| resourceLastMod, resourceRequest.getDeviceType())) { |
| return; |
| } else { |
| // set last-modified date |
| ModDateHeaderUtil.setLastModifiedHeader(response, resourceLastMod, |
| resourceRequest.getDeviceType()); |
| } |
| |
| // set the content type based on whatever is in our web.xml mime defs |
| if (resourceRequest.isThumbnail()) { |
| response.setContentType("image/png"); |
| try { |
| resourceStream = mediaFile.getThumbnailInputStream(); |
| } catch (Exception e) { |
| if (log.isDebugEnabled()) { |
| log.debug( |
| "ERROR loading thumbnail for " + mediaFile.getId(), |
| e); |
| } else { |
| log.warn("ERROR loading thumbnail for " + mediaFile.getId()); |
| } |
| } |
| } |
| |
| if (resourceStream == null) { |
| response.setContentType(mediaFile.getContentType()); |
| resourceStream = mediaFile.getInputStream(); |
| } |
| |
| OutputStream out; |
| try { |
| // ok, lets serve up the file |
| byte[] buf = new byte[RollerConstants.EIGHT_KB_IN_BYTES]; |
| int length; |
| out = response.getOutputStream(); |
| while ((length = resourceStream.read(buf)) > 0) { |
| out.write(buf, 0, length); |
| } |
| |
| // close output stream |
| out.close(); |
| |
| } catch (Exception ex) { |
| log.error("ERROR", ex); |
| if (!response.isCommitted()) { |
| response.reset(); |
| response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
| } |
| } finally { |
| // make sure stream to resource file is closed |
| resourceStream.close(); |
| } |
| |
| } |
| |
| } |