| /* |
| * 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.knox.gateway.filter; |
| |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.Cookie; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.http.HttpServletResponseWrapper; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| public class ResponseCookieFilter extends AbstractGatewayFilter { |
| public static final String RESTRICTED_COOKIES = "restrictedCookies"; |
| |
| private List<String> restrictedCookies = new ArrayList<>(); |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| super.init(filterConfig); |
| String cookies = filterConfig.getInitParameter(RESTRICTED_COOKIES); |
| if (cookies != null) { |
| restrictedCookies = Arrays.asList(cookies.split(",")); |
| } |
| } |
| |
| @Override |
| protected void doFilter( HttpServletRequest request, HttpServletResponse response, FilterChain chain ) throws IOException, ServletException { |
| ResponseWrapper responseWrapper = new ResponseWrapper( response ); |
| chain.doFilter( request, responseWrapper ); |
| } |
| |
| // inner class wraps response to prevent adding of not allowed headers |
| private class ResponseWrapper extends HttpServletResponseWrapper { |
| ResponseWrapper( HttpServletResponse response ) { |
| super( response ); |
| } |
| |
| @Override |
| public void addCookie(Cookie cookie ) { |
| if( cookie != null && isAllowedHeader( cookie.getName() ) ) { |
| super.addCookie( cookie ); |
| } |
| } |
| |
| @Override |
| public void setHeader(String name, String value ) { |
| if( isAllowedHeader( name ) ) { |
| super.setHeader( name, value ); |
| } |
| } |
| |
| @Override |
| public void addHeader(String name, String value ) { |
| if( isAllowedHeader( name ) ) { |
| super.addHeader( name, value ); |
| } |
| } |
| |
| private boolean isAllowedHeader( String value ) { |
| if( value != null ) { |
| for( String v : restrictedCookies ) { |
| if( value.contains( v ) ) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| } |
| } |