| /* |
| * 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.sling.starter.startup.impl; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.PrintWriter; |
| import java.nio.charset.StandardCharsets; |
| import java.util.stream.Collectors; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class StartupFilter implements Filter { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(StartupFilter.class); |
| |
| private String content; |
| |
| StartupFilter() { |
| // try a custom page (provided by a fragment bundle) first. |
| InputStream is = StartupFilter.class.getClassLoader().getResourceAsStream("custom_index.html"); |
| if (is == null) { |
| // try the standard page |
| is = StartupFilter.class.getClassLoader().getResourceAsStream("index.html"); |
| } |
| if (is != null) { |
| BufferedReader buffer = null; |
| try { |
| buffer = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8)); |
| content = buffer.lines().collect(Collectors.joining(System.lineSeparator())); |
| } finally { |
| if (buffer != null) { |
| try { |
| buffer.close(); |
| } catch (IOException e) { |
| LOG.error("Unable to release resource.", e); |
| } |
| } |
| } |
| } |
| if (content == null || "".equals(content)) { |
| content = "<html><head><meta http-equiv=\"refresh\" content=\"5\"><title>Apache Sling</title></head><body>" + |
| "<h1>Apache Sling is starting up....</h1></body></html>"; |
| } |
| } |
| |
| @Override |
| public void init(final FilterConfig filterConfig) { |
| // nothing to do |
| } |
| |
| @Override |
| public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException { |
| |
| HttpServletResponse httpResponse = (HttpServletResponse) response; |
| httpResponse.setContentType("text/html"); |
| httpResponse.setCharacterEncoding("utf-8"); |
| httpResponse.setHeader("Cache-Control", "no-store"); |
| httpResponse.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE); |
| if (!"".equals(content) && content != null) { |
| final PrintWriter pw = response.getWriter(); |
| pw.append(content); |
| pw.flush(); |
| } |
| } |
| |
| @Override |
| public void destroy() { |
| // nothing to do |
| } |
| } |
