| /* |
| * 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.livy; |
| |
| import com.fasterxml.jackson.core.type.TypeReference; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import org.apache.knox.gateway.dispatch.DefaultDispatch; |
| import org.apache.knox.gateway.filter.rewrite.impl.UrlRewriteRequestStream; |
| import org.apache.knox.gateway.security.SubjectUtils; |
| |
| import javax.servlet.ServletInputStream; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletRequestWrapper; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.BufferedReader; |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * This specialized dispatch provides Livy specific features to the |
| * default dispatch. |
| */ |
| public class LivyDispatch extends DefaultDispatch { |
| |
| @Override |
| public void doPost(URI url, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, URISyntaxException { |
| super.doPost(url, new LivyHttpServletRequest(request), response); |
| } |
| |
| /** |
| * HttpServletRequest that adds or sets the proxyUser parameter on the json body |
| */ |
| private class LivyHttpServletRequest extends HttpServletRequestWrapper { |
| private final List<String> proxyUserEndpoints = Arrays.asList("/batches", "/sessions"); |
| |
| LivyHttpServletRequest(HttpServletRequest request) { |
| super(request); |
| } |
| |
| @Override |
| public ServletInputStream getInputStream() throws IOException { |
| ServletInputStream inputStream = super.getInputStream(); |
| |
| HttpServletRequest request = (HttpServletRequest)getRequest(); |
| String requestURI = request.getRequestURI(); |
| if(matchProxyUserEndpoints(requestURI)) { |
| // Parse the json object from the request |
| ObjectMapper objectMapper = new ObjectMapper(); |
| Map<String, Object> jsonMap = objectMapper.readValue(inputStream, new TypeReference<Map<String,Object>>(){}); |
| |
| // Force the proxyUser to be set to the remote user |
| jsonMap.put("proxyUser", SubjectUtils.getCurrentEffectivePrincipalName()); |
| |
| // Create the new ServletInputStream with modified json map. |
| String s = objectMapper.writeValueAsString(jsonMap); |
| return new UrlRewriteRequestStream(new ByteArrayInputStream(s.getBytes(StandardCharsets.UTF_8))); |
| } |
| |
| return inputStream; |
| } |
| |
| private boolean matchProxyUserEndpoints(String requestURI) { |
| for(String endpoint : proxyUserEndpoints) { |
| if(requestURI.endsWith(endpoint) || requestURI.endsWith(endpoint + '/')) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public BufferedReader getReader() throws IOException { |
| return new BufferedReader(new InputStreamReader(getInputStream(), StandardCharsets.UTF_8)); |
| } |
| } |
| } |
| |