| /* |
| * 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.ambari.server.api; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| 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.HttpServletRequestWrapper; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.springframework.http.HttpMethod; |
| |
| public class MethodOverrideFilter implements Filter { |
| private static final String HEADER_NAME = "X-Http-Method-Override"; |
| //limit override to GET method only (no need for others now) |
| private static final List<String> ALLOWED_METHODS = new ArrayList<String>(){{ |
| add("GET"); |
| }}; |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { |
| if (request instanceof HttpServletRequest) { |
| HttpServletRequest httpServletRequest = (HttpServletRequest) request; |
| |
| String method = httpServletRequest.getHeader(HEADER_NAME); |
| if (method != null) { |
| if (ALLOWED_METHODS.contains(method.toUpperCase())) { |
| final HttpMethod httpMethod = HttpMethod.valueOf(method.toUpperCase()); |
| HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper(httpServletRequest){ |
| @Override |
| public String getMethod() { |
| return httpMethod.toString(); |
| } |
| }; |
| |
| chain.doFilter(requestWrapper, response); |
| return; |
| } else { |
| HttpServletResponse httpResponse = (HttpServletResponse) response; |
| httpResponse.sendError(400, "Incorrect HTTP method for override: "+ method + ". Allowed values: "+ ALLOWED_METHODS); |
| } |
| } |
| } |
| chain.doFilter(request, response); |
| } |
| |
| @Override |
| public void destroy() { |
| |
| } |
| } |