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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.localserver;
29  
30  import java.io.IOException;
31  import java.util.Locale;
32  
33  import org.apache.http.HttpEntity;
34  import org.apache.http.HttpEntityEnclosingRequest;
35  import org.apache.http.HttpException;
36  import org.apache.http.HttpRequest;
37  import org.apache.http.HttpResponse;
38  import org.apache.http.MethodNotSupportedException;
39  import org.apache.http.nio.entity.NByteArrayEntity;
40  import org.apache.http.protocol.HttpContext;
41  import org.apache.http.protocol.HttpRequestHandler;
42  import org.apache.http.util.EntityUtils;
43  
44  /**
45   * A handler that echos the incoming request entity.
46   */
47  public class EchoHandler
48      implements HttpRequestHandler {
49  
50      // public default constructor
51  
52      /**
53       * Handles a request by echoing the incoming request entity.
54       * If there is no request entity, an empty document is returned.
55       *
56       * @param request   the request
57       * @param response  the response
58       * @param context   the context
59       *
60       * @throws HttpException    in case of a problem
61       * @throws IOException      in case of an IO problem
62       */
63      public void handle(final HttpRequest request,
64                         final HttpResponse response,
65                         final HttpContext context)
66          throws HttpException, IOException {
67  
68          final String method = request.getRequestLine().getMethod().toUpperCase(Locale.ENGLISH);
69          if (!"GET".equals(method) &&
70              !"POST".equals(method) &&
71              !"PUT".equals(method)
72              ) {
73              throw new MethodNotSupportedException
74                  (method + " not supported by " + getClass().getName());
75          }
76  
77          HttpEntity entity = null;
78          if (request instanceof HttpEntityEnclosingRequest) {
79              entity = ((HttpEntityEnclosingRequest)request).getEntity();
80          }
81  
82          // For some reason, just putting the incoming entity into
83          // the response will not work. We have to buffer the message.
84          final byte[] data;
85          if (entity == null) {
86              data = new byte [0];
87          } else {
88              data = EntityUtils.toByteArray(entity);
89          }
90  
91          final NByteArrayEntity bae = new NByteArrayEntity(data);
92          if (entity != null) {
93              bae.setContentType(entity.getContentType());
94          }
95          response.setEntity(bae);
96      }
97  
98  }