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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.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.HttpHeaders;
37  import org.apache.hc.core5.http.HttpRequest;
38  import org.apache.hc.core5.http.HttpRequestInterceptor;
39  import org.apache.hc.core5.http.HttpVersion;
40  import org.apache.hc.core5.http.Method;
41  import org.apache.hc.core5.http.ProtocolException;
42  import org.apache.hc.core5.http.ProtocolVersion;
43  import org.apache.hc.core5.net.URIAuthority;
44  import org.apache.hc.core5.util.Args;
45  
46  /**
47   * RequestHostOutgoing is responsible for adding {@code Host} header to the outgoing message.
48   * This interceptor is required for client side protocol processors.
49   *
50   * @since 4.0
51   */
52  @Contract(threading = ThreadingBehavior.IMMUTABLE)
53  public class RequestTargetHost implements HttpRequestInterceptor {
54  
55      /**
56       * Singleton instance.
57       * @since 5.2
58       */
59      public static final HttpRequestInterceptor INSTANCE = new RequestTargetHost();
60  
61      public RequestTargetHost() {
62          super();
63      }
64  
65      @Override
66      public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
67              throws HttpException, IOException {
68          Args.notNull(request, "HTTP request");
69          Args.notNull(context, "HTTP context");
70  
71          final ProtocolVersion ver = context.getProtocolVersion();
72          final String method = request.getMethod();
73          if (Method.CONNECT.isSame(method) && ver.lessEquals(HttpVersion.HTTP_1_0)) {
74              return;
75          }
76  
77          if (!request.containsHeader(HttpHeaders.HOST)) {
78              URIAuthority authority = request.getAuthority();
79              if (authority == null) {
80                  if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
81                      return;
82                  }
83                  throw new ProtocolException("Target host is unknown");
84              }
85              if (authority.getUserInfo() != null) {
86                  authority = new URIAuthority(authority.getHostName(), authority.getPort());
87              }
88              request.addHeader(HttpHeaders.HOST, authority);
89          }
90      }
91  
92  }