View Javadoc
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.protocol;
29  
30  import java.io.IOException;
31  
32  import org.apache.hc.core5.annotation.Contract;
33  import org.apache.hc.core5.annotation.ThreadingBehavior;
34  import org.apache.hc.core5.http.EntityDetails;
35  import org.apache.hc.core5.http.HttpException;
36  import org.apache.hc.core5.http.HttpRequest;
37  import org.apache.hc.core5.http.HttpRequestInterceptor;
38  import org.apache.hc.core5.http.MisdirectedRequestException;
39  import org.apache.hc.core5.http.ProtocolException;
40  import org.apache.hc.core5.http.URIScheme;
41  import org.apache.hc.core5.net.URIAuthority;
42  import org.apache.hc.core5.util.Args;
43  import org.apache.hc.core5.util.TextUtils;
44  
45  /**
46   * This request interceptor is responsible for execution of the protocol conformance
47   * checks on incoming request messages.
48   * <p>
49   * This interceptor is essential for the HTTP protocol conformance and
50   * the correct operation of the server-side message processing pipeline.
51   * </p>
52   *
53   * @since 5.3
54   */
55  @Contract(threading = ThreadingBehavior.IMMUTABLE)
56  public class RequestConformance implements HttpRequestInterceptor {
57  
58      public static final RequestConformance INSTANCE = new RequestConformance();
59  
60      public RequestConformance() {
61          super();
62      }
63  
64      @Override
65      public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
66              throws HttpException, IOException {
67          Args.notNull(request, "HTTP request");
68  
69          if (TextUtils.isBlank(request.getScheme())) {
70              throw new ProtocolException("Request scheme is not set");
71          }
72          if (TextUtils.isBlank(request.getPath())) {
73              throw new ProtocolException("Request path is not set");
74          }
75          final URIAuthority authority = request.getAuthority();
76          if (authority != null && (URIScheme.HTTP.same(request.getScheme()) || URIScheme.HTTPS.same(request.getScheme()))) {
77              final String hostName = authority.getHostName();
78              if (TextUtils.isBlank(hostName)) {
79                  throw new ProtocolException("Request host is empty");
80              }
81          }
82          if (URIScheme.HTTPS.same(request.getScheme()) && context.getAttribute(HttpCoreContext.SSL_SESSION) == null) {
83              throw new MisdirectedRequestException("HTTPS request over non-secure connection");
84          }
85      }
86  
87  }