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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  package org.apache.http.impl.execchain;
28  
29  import java.lang.reflect.InvocationHandler;
30  import java.lang.reflect.Proxy;
31  
32  import org.apache.http.HttpEntity;
33  import org.apache.http.HttpEntityEnclosingRequest;
34  import org.apache.http.HttpRequest;
35  import org.apache.http.HttpResponse;
36  import org.apache.http.annotation.NotThreadSafe;
37  import org.apache.http.client.methods.CloseableHttpResponse;
38  
39  /**
40   * Execution proxies for HTTP message objects.
41   *
42   * @since 4.3
43   */
44  @NotThreadSafe
45  class Proxies {
46  
47      static void enhanceEntity(final HttpEntityEnclosingRequest request) {
48          final HttpEntity entity = request.getEntity();
49          if (entity != null && !entity.isRepeatable() && !isEnhanced(entity)) {
50              final HttpEntity proxy = (HttpEntity) Proxy.newProxyInstance(
51                      HttpEntity.class.getClassLoader(),
52                      new Class<?>[] { HttpEntity.class },
53                      new RequestEntityExecHandler(entity));
54              request.setEntity(proxy);
55          }
56      }
57  
58      static boolean isEnhanced(final HttpEntity entity) {
59          if (entity != null && Proxy.isProxyClass(entity.getClass())) {
60              final InvocationHandler handler = Proxy.getInvocationHandler(entity);
61              return handler instanceof RequestEntityExecHandler;
62          } else {
63              return false;
64          }
65      }
66  
67      static boolean isRepeatable(final HttpRequest request) {
68          if (request instanceof HttpEntityEnclosingRequest) {
69              final HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
70              if (entity != null) {
71                  if (isEnhanced(entity)) {
72                      final RequestEntityExecHandler handler = (RequestEntityExecHandler)
73                              Proxy.getInvocationHandler(entity);
74                      if (!handler.isConsumed()) {
75                          return true;
76                      }
77                  }
78                  return entity.isRepeatable();
79              }
80          }
81          return true;
82      }
83  
84      public static CloseableHttpResponse enhanceResponse(
85              final HttpResponse original,
86              final ConnectionHolder connHolder) {
87          return (CloseableHttpResponse) Proxy.newProxyInstance(
88                  ResponseProxyHandler.class.getClassLoader(),
89                  new Class<?>[] { CloseableHttpResponse.class },
90                  new ResponseProxyHandler(original, connHolder));
91      }
92  
93  }