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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  import java.net.URISyntaxException;
32  
33  import org.apache.hc.core5.annotation.Contract;
34  import org.apache.hc.core5.annotation.ThreadingBehavior;
35  import org.apache.hc.core5.http.EntityDetails;
36  import org.apache.hc.core5.http.Header;
37  import org.apache.hc.core5.http.HttpException;
38  import org.apache.hc.core5.http.HttpHeaders;
39  import org.apache.hc.core5.http.HttpRequest;
40  import org.apache.hc.core5.http.HttpRequestInterceptor;
41  import org.apache.hc.core5.http.HttpVersion;
42  import org.apache.hc.core5.http.ProtocolException;
43  import org.apache.hc.core5.http.ProtocolVersion;
44  import org.apache.hc.core5.net.URIAuthority;
45  import org.apache.hc.core5.util.Args;
46  
47  /**
48   * RequestTargetHost is responsible for copying {@code Host} header value to
49   * {@link HttpRequest#setAuthority(URIAuthority)} of the incoming message.
50   * This interceptor is required for server side protocol processors.
51   *
52   * @since 5.0
53   */
54  @Contract(threading = ThreadingBehavior.IMMUTABLE)
55  public class RequestValidateHost implements HttpRequestInterceptor {
56  
57      public RequestValidateHost() {
58          super();
59      }
60  
61      @Override
62      public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
63              throws HttpException, IOException {
64          Args.notNull(request, "HTTP request");
65  
66          final Header header = request.getSingleHeader(HttpHeaders.HOST);
67          if (header != null) {
68              final URIAuthority authority;
69              try {
70                  authority = URIAuthority.create(header.getValue());
71              } catch (final URISyntaxException ex) {
72                  throw new ProtocolException(ex.getMessage(), ex);
73              }
74              request.setAuthority(authority);
75          } else {
76              final ProtocolVersion version = request.getVersion() != null ? request.getVersion() : HttpVersion.HTTP_1_1;
77              if (version.greaterEquals(HttpVersion.HTTP_1_1)) {
78                  throw new ProtocolException("Host header is absent");
79              }
80          }
81      }
82  
83  }