| /** |
| * 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.hadoop.http.lib; |
| |
| import java.io.IOException; |
| import java.security.Principal; |
| import java.util.HashMap; |
| |
| 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.HttpServletRequestWrapper; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.http.FilterContainer; |
| import org.apache.hadoop.http.FilterInitializer; |
| |
| import javax.servlet.Filter; |
| |
| /** |
| * Provides a servlet filter that pretends to authenticate a fake user (Dr.Who) |
| * so that the web UI is usable for a secure cluster without authentication. |
| */ |
| public class StaticUserWebFilter extends FilterInitializer { |
| private static final String WEB_USERNAME = "Dr.Who"; |
| private static final Principal WEB_USER = new User(WEB_USERNAME); |
| |
| static class User implements Principal { |
| private final String name; |
| public User(String name) { |
| this.name = name; |
| } |
| @Override |
| public String getName() { |
| return name; |
| } |
| @Override |
| public int hashCode() { |
| return name.hashCode(); |
| } |
| @Override |
| public boolean equals(Object other) { |
| if (other == this) { |
| return true; |
| } else if (other == null || other.getClass() != getClass()) { |
| return false; |
| } |
| return ((User) other).name.equals(name); |
| } |
| @Override |
| public String toString() { |
| return name; |
| } |
| } |
| |
| public static class StaticUserFilter implements Filter { |
| |
| @Override |
| public void destroy() { |
| // NOTHING |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, |
| FilterChain chain |
| ) throws IOException, ServletException { |
| HttpServletRequest httpRequest = (HttpServletRequest) request; |
| // if the user is already authenticated, don't override it |
| if (httpRequest.getRemoteUser() != null) { |
| chain.doFilter(request, response); |
| } else { |
| HttpServletRequestWrapper wrapper = |
| new HttpServletRequestWrapper(httpRequest) { |
| @Override |
| public Principal getUserPrincipal() { |
| return WEB_USER; |
| } |
| @Override |
| public String getRemoteUser() { |
| return WEB_USERNAME; |
| } |
| }; |
| chain.doFilter(wrapper, response); |
| } |
| } |
| |
| @Override |
| public void init(FilterConfig conf) throws ServletException { |
| // NOTHING |
| } |
| |
| } |
| |
| @Override |
| public void initFilter(FilterContainer container, Configuration conf) { |
| container.addFilter("static_user_filter", StaticUserFilter.class.getName(), |
| new HashMap<String,String>()); |
| } |
| } |