001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020 package org.apache.myfaces.tobago.servlet; 021 022 import org.apache.commons.io.IOUtils; 023 import org.apache.commons.logging.Log; 024 import org.apache.commons.logging.LogFactory; 025 import org.apache.myfaces.tobago.util.MimeTypeUtils; 026 027 import javax.servlet.ServletConfig; 028 import javax.servlet.ServletException; 029 import javax.servlet.http.HttpServlet; 030 import javax.servlet.http.HttpServletRequest; 031 import javax.servlet.http.HttpServletResponse; 032 import java.io.IOException; 033 import java.io.InputStream; 034 import java.util.Date; 035 036 /** 037 * <p><pre> 038 * <servlet> 039 * <servlet-name>ResourceServlet</servlet-name> 040 * <servlet-class>org.apache.myfaces.tobago.servlet.ResourceServlet</servlet-class> 041 * <init-param> 042 * <description>The value for the expires header in seconds. 043 * Default is no expires header.</description> 044 * <param-name>expires</param-name> 045 * <param-value>14400</param-value> 046 * </init-param> 047 * </servlet> 048 * <servlet-mapping> 049 * <servlet-name>ResourceServlet</servlet-name> 050 * <url-pattern>/org/apache/myfaces/tobago/renderkit/*</url-pattern> 051 * </servlet-mapping> 052 * </pre><p> 053 * 054 * @since 1.0.7 055 */ 056 public class ResourceServlet extends HttpServlet { 057 058 private static final long serialVersionUID = -4491419290205206466L; 059 060 private static final Log LOG = LogFactory.getLog(ResourceServlet.class); 061 062 private Long expires; 063 064 @Override 065 public void init(ServletConfig servletConfig) throws ServletException { 066 super.init(servletConfig); 067 String expiresString = servletConfig.getInitParameter("expires"); 068 069 expires = null; 070 if (expiresString != null) { 071 try { 072 expires = new Long(expiresString); 073 } catch (NumberFormatException e) { 074 LOG.error("Caught: " + e.getMessage(), e); 075 } 076 } 077 } 078 079 @Override 080 protected void service( 081 HttpServletRequest request, HttpServletResponse response) 082 throws ServletException, IOException { 083 084 String requestURI = request.getRequestURI(); 085 String resource = requestURI.substring(request.getContextPath().length() + 1); 086 087 if (expires != null) { 088 response.setHeader("Cache-Control", "max-age=" + expires); 089 response.setDateHeader("Expires", new Date().getTime() + (expires * 1000)); 090 } 091 String contentType = MimeTypeUtils.getMimeTypeForFile(requestURI); 092 if (contentType != null) { 093 response.setContentType(contentType); 094 } else { 095 String message = "Unsupported mime type of resource='" + resource + "'"; 096 LOG.warn(message + " (because of security reasons)"); 097 response.sendError(HttpServletResponse.SC_FORBIDDEN, message); 098 return; 099 } 100 101 InputStream inputStream = null; 102 try { 103 ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); 104 105 // meta inf (like in servlet 3.0) 106 inputStream = classLoader.getResourceAsStream("META-INF/resources/" + resource); 107 108 // "normal" classpath 109 if (inputStream == null) { 110 inputStream = classLoader.getResourceAsStream(resource); 111 } 112 113 if (inputStream != null) { 114 IOUtils.copy(inputStream, response.getOutputStream()); 115 } else { 116 String message = "Resource '" + resource + "' not found!"; 117 LOG.warn(message); 118 response.sendError(HttpServletResponse.SC_NOT_FOUND, message); 119 } 120 } finally { 121 IOUtils.closeQuietly(inputStream); 122 } 123 } 124 }