| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. 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. |
| */ |
| package org.apache.clerezza.platform.xhtml2html; |
| |
| import java.io.IOException; |
| import java.util.Enumeration; |
| import java.util.regex.Pattern; |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Properties; |
| import org.apache.felix.scr.annotations.Property; |
| import org.apache.felix.scr.annotations.Service; |
| import org.osgi.service.component.ComponentContext; |
| |
| /** |
| * This Filter acts on client agents matching a pattern defined by the service |
| * property |
| * <code>pattern</code>, it changes the returhned content type from |
| * application/xhtml+xml to application/html and adds application/xhtml+xml to |
| * the accept header. |
| * |
| */ |
| @Component(immediate=true) |
| @Service(Filter.class) |
| @Properties(value = { |
| @Property(name="pattern",value=".*"), |
| @Property(name = "service.ranking", intValue = Integer.MAX_VALUE), |
| @Property(name = "agent-pattern", value = {".*MSIE.*", ""}) |
| }) |
| public class Xhtml2HtmlFilter implements Filter { |
| |
| private Pattern[] patterns; |
| |
| |
| private boolean isApplicable(final HttpServletRequest request) { |
| if (htmlPreferredInAccept(request)) { |
| return true; |
| } |
| final Enumeration<String> userAgentStrings = request.getHeaders("User-Agent"); |
| while (userAgentStrings.hasMoreElements()) { |
| final String userAgentString = userAgentStrings.nextElement(); |
| for (final Pattern pattern : patterns) { |
| if (pattern.matcher(userAgentString).matches()) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private boolean htmlPreferredInAccept(HttpServletRequest request) { |
| Enumeration<String> accepts = request.getHeaders("Accept"); |
| AcceptHeader acceptHeader = new AcceptHeader(accepts); |
| for (MediaType accept : acceptHeader.getEntries()) { |
| if (accept.isCompatible(MediaType.APPLICATION_XHTML_XML_TYPE)) { |
| return false; |
| } |
| if (accept.isCompatible(MediaType.TEXT_HTML_TYPE)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| protected void activate(ComponentContext context) throws Exception { |
| final String[] patternStrings = (String[]) context.getProperties(). |
| get("agent-pattern"); |
| patterns = new Pattern[patternStrings.length]; |
| for (int i = 0; i < patternStrings.length; i++) { |
| patterns[i] = Pattern.compile(patternStrings[i]); |
| } |
| } |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, |
| ServletResponse response, FilterChain chain) throws IOException, ServletException { |
| if (!isApplicable((HttpServletRequest)request)) { |
| chain.doFilter(request, response); |
| } else { |
| chain.doFilter(new WrappedRequest((HttpServletRequest)request), |
| new WrappedResponse((HttpServletResponse)response)); |
| } |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| } |