| /* |
| * 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.dispatch; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Set; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.knox.gateway.util.MimeTypes; |
| import org.apache.http.Header; |
| import org.apache.http.HttpEntity; |
| import org.apache.http.HttpResponse; |
| import org.apache.http.client.methods.HttpUriRequest; |
| import org.apache.http.entity.ContentType; |
| |
| public class NiFiDispatch extends DefaultDispatch { |
| |
| @Override |
| protected void executeRequest(HttpUriRequest outboundRequest, HttpServletRequest inboundRequest, HttpServletResponse outboundResponse) throws IOException { |
| outboundRequest = NiFiRequestUtil.modifyOutboundRequest(outboundRequest, inboundRequest); |
| HttpResponse inboundResponse = executeOutboundRequest(outboundRequest); |
| writeOutboundResponse(outboundRequest, inboundRequest, outboundResponse, inboundResponse); |
| } |
| |
| /** |
| * Overridden to provide a spot to modify the outbound response before its stream is closed. |
| */ |
| protected void writeOutboundResponse(HttpUriRequest outboundRequest, HttpServletRequest inboundRequest, HttpServletResponse outboundResponse, HttpResponse inboundResponse) throws IOException { |
| // Copy the client respond header to the server respond. |
| outboundResponse.setStatus(inboundResponse.getStatusLine().getStatusCode()); |
| Header[] headers = inboundResponse.getAllHeaders(); |
| Set<String> excludeHeaders = getOutboundResponseExcludeHeaders(); |
| boolean hasExcludeHeaders = false; |
| if ((excludeHeaders != null) && !(excludeHeaders.isEmpty())) { |
| hasExcludeHeaders = true; |
| } |
| for ( Header header : headers ) { |
| String name = header.getName(); |
| if (hasExcludeHeaders && excludeHeaders.contains(name.toUpperCase())) { |
| continue; |
| } |
| String value = header.getValue(); |
| outboundResponse.addHeader(name, value); |
| } |
| |
| HttpEntity entity = inboundResponse.getEntity(); |
| if( entity != null ) { |
| outboundResponse.setContentType( getInboundResponseContentType( entity ) ); |
| InputStream stream = entity.getContent(); |
| try { |
| NiFiResponseUtil.modifyOutboundResponse(inboundRequest, outboundResponse, inboundResponse); |
| writeResponse( inboundRequest, outboundResponse, stream ); |
| } finally { |
| closeInboundResponse( inboundResponse, stream ); |
| } |
| } |
| } |
| |
| /** |
| * Overriden due to {@link DefaultDispatch#getInboundResponseContentType(HttpEntity) having private access, and the method is used by |
| * {@link #writeOutboundResponse(HttpUriRequest, HttpServletRequest, HttpServletResponse, HttpResponse)}} |
| */ |
| private String getInboundResponseContentType( final HttpEntity entity ) { |
| String fullContentType = null; |
| if( entity != null ) { |
| ContentType entityContentType = ContentType.get( entity ); |
| if( entityContentType != null ) { |
| if( entityContentType.getCharset() == null ) { |
| final String entityMimeType = entityContentType.getMimeType(); |
| final String defaultCharset = MimeTypes.getDefaultCharsetForMimeType( entityMimeType ); |
| if( defaultCharset != null ) { |
| LOG.usingDefaultCharsetForEntity( entityMimeType, defaultCharset ); |
| entityContentType = entityContentType.withCharset( defaultCharset ); |
| } |
| } else { |
| LOG.usingExplicitCharsetForEntity( entityContentType.getMimeType(), entityContentType.getCharset() ); |
| } |
| fullContentType = entityContentType.toString(); |
| } |
| } |
| if( fullContentType == null ) { |
| LOG.unknownResponseEntityContentType(); |
| } else { |
| LOG.inboundResponseEntityContentType( fullContentType ); |
| } |
| return fullContentType; |
| } |
| } |