| /** |
| * 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.gateway.dispatch; |
| |
| import org.apache.hadoop.gateway.filter.GatewayResponse; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.http.client.HttpClient; |
| import org.apache.http.client.methods.HttpUriRequest; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.Enumeration; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| public abstract class AbstractGatewayDispatch implements Dispatch { |
| |
| private static int STREAM_COPY_BUFFER_SIZE = 4096; |
| private static Set<String> REQUEST_EXCLUDE_HEADERS; |
| |
| protected HttpClient client; |
| |
| @Override |
| public void init() { |
| REQUEST_EXCLUDE_HEADERS = new HashSet<>(); |
| REQUEST_EXCLUDE_HEADERS.add("Host"); |
| REQUEST_EXCLUDE_HEADERS.add("Authorization"); |
| REQUEST_EXCLUDE_HEADERS.add("Content-Length"); |
| REQUEST_EXCLUDE_HEADERS.add("Transfer-Encoding"); |
| } |
| |
| protected void writeResponse(HttpServletRequest request, HttpServletResponse response, InputStream stream ) |
| throws IOException { |
| // ResponseStreamer streamer = |
| // (ResponseStreamer)request.getAttribute( RESPONSE_STREAMER_ATTRIBUTE_NAME ); |
| // if( streamer != null ) { |
| // streamer.streamResponse( stream, response.getOutputStream() ); |
| // } else { |
| if( response instanceof GatewayResponse ) { |
| ((GatewayResponse)response).streamResponse( stream ); |
| } else { |
| OutputStream output = response.getOutputStream(); |
| IOUtils.copyBytes( stream, output, STREAM_COPY_BUFFER_SIZE ); |
| //KNOX-685: output.flush(); |
| output.close(); |
| } |
| // } |
| } |
| |
| @Override |
| public HttpClient getHttpClient() { |
| return client; |
| } |
| |
| @Override |
| public void setHttpClient(HttpClient client) { |
| this.client = client; |
| } |
| |
| @Override |
| public URI getDispatchUrl(HttpServletRequest request) { |
| StringBuffer str = request.getRequestURL(); |
| String query = request.getQueryString(); |
| if ( query != null ) { |
| str.append('?'); |
| str.append(query); |
| } |
| URI url = URI.create(str.toString()); |
| return url; |
| } |
| |
| public void doGet( URI url, HttpServletRequest request, HttpServletResponse response ) |
| throws IOException, URISyntaxException { |
| response.sendError( HttpServletResponse.SC_METHOD_NOT_ALLOWED ); |
| } |
| |
| public void doPost( URI url, HttpServletRequest request, HttpServletResponse response ) |
| throws IOException, URISyntaxException { |
| response.sendError( HttpServletResponse.SC_METHOD_NOT_ALLOWED ); |
| } |
| |
| public void doPut( URI url, HttpServletRequest request, HttpServletResponse response ) |
| throws IOException, URISyntaxException { |
| response.sendError( HttpServletResponse.SC_METHOD_NOT_ALLOWED ); |
| } |
| |
| public void doDelete( URI url, HttpServletRequest request, HttpServletResponse response ) |
| throws IOException, URISyntaxException { |
| response.sendError( HttpServletResponse.SC_METHOD_NOT_ALLOWED ); |
| } |
| |
| public void doOptions( URI url, HttpServletRequest request, HttpServletResponse response ) |
| throws IOException, URISyntaxException { |
| response.sendError( HttpServletResponse.SC_METHOD_NOT_ALLOWED ); |
| } |
| |
| public void copyRequestHeaderFields(HttpUriRequest outboundRequest, |
| HttpServletRequest inboundRequest) { |
| Enumeration<String> headerNames = inboundRequest.getHeaderNames(); |
| while( headerNames.hasMoreElements() ) { |
| String name = headerNames.nextElement(); |
| if ( !outboundRequest.containsHeader( name ) |
| && !getOutboundRequestExcludeHeaders().contains( name ) ) { |
| String value = inboundRequest.getHeader( name ); |
| outboundRequest.addHeader( name, value ); |
| } |
| } |
| } |
| |
| public Set<String> getOutboundRequestExcludeHeaders() { |
| return REQUEST_EXCLUDE_HEADERS; |
| } |
| |
| } |