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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.hc.core5.http.io.support;
29  
30  import java.io.IOException;
31  
32  import org.apache.hc.core5.http.ClassicHttpRequest;
33  import org.apache.hc.core5.http.ClassicHttpResponse;
34  import org.apache.hc.core5.http.Header;
35  import org.apache.hc.core5.http.HttpException;
36  import org.apache.hc.core5.http.HttpHeaders;
37  import org.apache.hc.core5.http.HttpStatus;
38  import org.apache.hc.core5.http.io.HttpServerRequestHandler;
39  import org.apache.hc.core5.http.message.BasicClassicHttpResponse;
40  import org.apache.hc.core5.http.protocol.HttpContext;
41  import org.apache.hc.core5.util.Args;
42  
43  /**
44   * @since 5.0
45   */
46  public class BasicHttpServerExpectationDecorator implements HttpServerRequestHandler {
47  
48      private final HttpServerRequestHandler requestHandler;
49  
50      public BasicHttpServerExpectationDecorator(final HttpServerRequestHandler requestHandler) {
51          this.requestHandler = Args.notNull(requestHandler, "Request handler");
52      }
53  
54      protected ClassicHttpResponse verify(final ClassicHttpRequest request, final HttpContext context) {
55          return null;
56      }
57  
58      @Override
59      public final void handle(
60              final ClassicHttpRequest request,
61              final ResponseTrigger responseTrigger,
62              final HttpContext context) throws HttpException, IOException {
63          final Header expect = request.getFirstHeader(HttpHeaders.EXPECT);
64          if (expect != null && "100-continue".equalsIgnoreCase(expect.getValue())) {
65              final ClassicHttpResponse response = verify(request, context);
66              if (response == null) {
67                  responseTrigger.sendInformation(new BasicClassicHttpResponse(HttpStatus.SC_CONTINUE));
68              } else {
69                  responseTrigger.submitResponse(response);
70                  return;
71              }
72          }
73          requestHandler.handle(request, responseTrigger, context);
74      }
75  
76  }